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Патент USA US2117917

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May 17, 1938-
1
H. A. SILVEN
'
2,117,917
~ AUTOMATIC GRINDING MACHINE
Filed Oct. 4, 1957
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May 17, 1938.
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H.111. SILVEN
2,117,917
AUTOMATIC GRINDING MACHINE
Filed Oct. 4, 1937
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HERBERT A. SILVEN
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May 17, 1938.
H. A.‘ SILVEN‘ -
2,117,917
AUTOMATiC GRINDING MACHINE
Filed Oct. 4, 1957
6 Sheets-Sheet 3
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May 17,1938.
2,117,917
1-1. A. SILVEN
AUTOMATIC GRINDING MACHINE
Filed Oct. 4, 1937
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Patented May 17, 1938
-
2,117,917
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UNITED STATES PATENT OFFICE
2,117,917‘
AUTOMATIC GRINDING MACHINE
Herbert A. Silven, Worcester, Mass., assignor to
Norton Company, Worcester, Mass, a corpora- '
tion of Massachusetts
>
Application October 4, 1937, Serial No. 167,131
1'! Claims. (Cl. 51--105)_
This invention relates to grinding machines,
and more particularly to a full automatic grind-
ing machine for grinding cylindrical work pieces.
One object of the invention is to provide a sim5. ple, thoroughly practical, improved full automatic
Fig. 1 is a front elevation of a grinding ma
chine embodying this invention; '
tion is to provide a hydraulically actuated full
automatic grinding machine in which the various
Fig. 2 is a piping and electrical diagram show
ing the electrical and ?uid pressure connections
between the various units and control valves;
5
Fig. 3 is a left hand end view of the left-hand
work head, taken approximately on the line 3--3
of Fig. 1, on an enlarged scale, with the motor re
mechanisms are provided with safety interlocks.
moved;
full automatic hydraulically operated ‘cylindrical
both of the work heads, taken approximately on
grinding machine in which the various hydraulic
control units are electrically interlocked. An-
the line 4-4 of Fig. 3;
»
Fig. 5 is a cross sectional view, on an enlarged
other object of the invention is to provide an
scale, through the work feeding and discharging
grinding machine. Another object of the inven-
10 A further object of the invention is to provide a
15 automatic work loading mechanism or carrier
which is provided with a plurality of work re-
ceiving pockets simultaneously to grip the ground
Fig. 4'is a horizontal sectional view through 10
mechanism, taken approximately on the line 5-5 15
of Fig. 1, showing the work carrier in position
during the grinding operation;
piece of work and a new piece of work and auto-
Fig. 6 is a similar view, showing the work car
,matically and simultaneously to shift the ground
rier moved‘forward to grip a new work piece and
20 piece of work to a discharge chute and the new
piece of work into alignment with the work supporting spindles.
.
the work piece which has been ?nish ground;
20
Fig. '7 is a similar sectional view through the
work loading mechanism, showing the work car
A further object of the invention is to ‘provide
rier tipped to swing the ground piece of work into
a discharge position and simultaneously to carry
a new piece of work into alignment with the work 25
spindles;
Fig. 8 is a similar cross sectional view through
the work'loading mechanism showing the work
carrier withdrawn to discharge a ground work
piece in the discharge chute after the spindles 30
‘have gripped the. work piece;
.
a work loading device in which a work carrying
25 head or member is moved horizontally into posi‘tion to grip a ground piece of work supported on
the driving spindles and a new piece of work supported in a hopper and simultaneously to rock
the carrier to transfer the ground piece of work
30 to a discharge position while the new piece of‘
work is transferred from the hopper into align-
ment with the work supporting member. A further object of the invention is to provide a hy-
draulically actuated work loading mechanism in
35 which the work carrying element is hydraulically
moved ?rst ina horizontal direction to grip a
Fig. 9»is a detail view,,0_n an enlarged scale, of
the ‘cycle trip SWltch;
, .
1
‘
Flg. 10 1s a fragmentary cross Sectional-View,
on an enlarged scale, taken approximatelvon the so
line III-l9 0f Flg- 1;
‘
ground piece of work and a new pieceof work
and then is hydraulically rocked to swing the car-
Fig- 11 is a fragmentary longitudinal ‘section.
on an enlarged scale, taken approximately. on the
rier and thereby simultaneously to transfer the
line ||--|| of Fig- 5;
40 ground piece of work from the spindles to a discharge position and the new piece of work from
the hopper into alignment with the work support
_
_
Fig- 12 is a cross Sectional View, taken aDDITOKF 4o
mately on the line l2--l2>0f Fig. 11;
Fig. 13 is a fragmentary cross sectional view,
taken approximately on the line I 3-13 of Fig. 11;
ingjtfgzyléfjrséts will be in part obvious or in part .
Fig. 14 is a fragmentary cross sectional view,
.
taken approximately on the line M—-i4 of Fig. 5; 45
mime‘? °ut hereinafter:
.
.
.
The invention accordingly consists in the fea-
Fig. 15 is a right-hand end elevation of the
right_hand work head on an enlarged scale
tures of construction, combinations of elements,
taken approximately on'the line |5___|5 of Fig 1;’
and arrangements of parts-1 as will be exempli?ed
50 in the ‘structure to be hereinafter described, and
the scope of the application of which will be indi-
cated in the following clalmsIn the HCCOmDaHYiHg drawings in Which is
shown one of various possible embodiments of
55 the mechanical features of this invention,
Fig. 16 is a rear view of the work loading mech
anism, taken ‘approximately on the line |6_|6 of 50
Fig 5; and
"
_
Fig. 17 is a horizontal sectional view, taken ap
proximately on the line i‘I-JT of Fig. 16.
A full automatic grinding machine has been
illustrated in the drawings comprising a base 20 55
2
2,117,917
which supports a longitudinally adjustable table
2| on the usual flat way 22 and V ‘way 23.
To
facilitate longitudinal adjustment of the table 2|
relative to the base 26, the table 2| is provided
with a depending rack bar 24 which meshes with
a gear 25 (Figs. 1 and 10) mounted on the inner
end of a rotatable shaft 26 which is journaled in
a bearing 21 ?xedly supported on the base 20.
The outer end of-the shaft 26 is provided with a
10 squared-off portion 28 which is adapted to be en
gaged by a removable lever 29 so that the table
may be adjusted longitudinally in setting-up the
machine for a given operation.
The base 20 also supports a transversely mov
15 able grinding wheel slide 32 which is supported on
the usual V and ?at ways to permit a transverse
adjustment of the slide relative to the base. The
slide 32 supports a rotatable wheel spindle 33
which in turn supports a rotatable grinding wheel
20 34. The grinding wheel spindle 33 may be ro
tated in any convenient manner such as, for ex
ample an overhead drive or a motor drive, such
as an electric motor 35 mounted on the upper
surface of the wheel slide 32. The motor 35
is provided with a driving pulley 36 which is pref
erably of a multiple V groove type and is arranged
to transmit power by means of multiple V belts
31 to a multiple V groove pulley 38 mounted on
the end of the wheel spindle 33 to rotate the
30 grinding wheel 34 for a grinding operation.
The wheel slide 32 isarranged for a transverse
feeding movement either manually for adjust
ment or setting-up of the machine, or auto
matically during the automatic cycle of opera
The wheel slide 32 is provided with
35 tion thereof.
a depending half nut 46 which meshes with or
engages a rotatable feed screw 4| journaled in a
slidably mounted bearing 42 at one end and a
bearing (not shown) at the other end. The for
40. ward end of the feed screw 4| is slidably keyed
by means of a sleeve to the inner end of a rotat
able shaft 43. The shaft 43 projects from the
front of the machine base and is provided on its
outer end with a gear 44 which meshes with a
45 gear 45 supported on a shaft 46. A manually
operable feed wheel 41 is also supported on the
shaft 46 and is either formed integral with or
?xedly mounted on the gear 45 so that rotation of
the manually operable feed wheel 41 is transmit
50 ted through the gear 45 and the-gear 44 to rotate
the shaft 43 and thereby rotate the feed screw
4| in either direction to adjust the position of
the wheel slide 32 as desired.
A pivotally mounted stop pawl 48 supported by
55 a stud 49 is arranged to engage an abutment
(not shown) positively to limit the infeed adjust
ment by the feed wheel 41. Associated with the
feed wheel 41 is a micrometer adjusting mecha
nism 59 by means of which the abutment carried
60 thereby may be precisely adjusted relatively to
the feed wheel 41. This feed mechanism has not
been illustrated in detail since it is not considered
part of the present invention.
For a more de
tailed disclosure of this feed mechanism, refer
65 ence may be had to the expired United States
patent to Norton No. 762,838 dated June 14, 1904
which discloses substantially the same type of
feeding mechanism.
'70
'
In order that the wheel slide 32 may be moyed
rapidly toward the work piece to grind the same
automatically bythe plunge-cut method, the feed
screw 4| is connected through the bearing 42 with
a piston rod 55. A ?uid pressure cylinder 53
is arranged in axial alignment with the feed
screw 4| and contains a slidably mounted piston
54 which is connected with the piston rod 55. A
?uid pressure pump 59 which , is driven by an
electric motor or other suitable power drive
serves to pump ?uid through a pipe 60 from a
reservoir 6| within the base 28. The pump 59
forces fluid under pressure through a pipe 62
to a main control or feed control valve 58. The
main control valve 58 is'preferably of a piston
type comprising a valve stem 63 and a plurality
of spaced pistons which form valve chambers 64,
65 and 66 therebetween. In the position of the‘
valve 58 (Fig. 2), fluid under pressure enters
the valve chamber 65 and passes out through a
passage 61 into a cylinder chamber 51 to cause
the piston 54 to move rapidly toward the left
(Fig. 2) 'to cause an infeeding movement of the
wheel slide 32 and the grinding wheel 34. During
the passage of ?uid under pressure into the
cylinder chamber 51, ?uid is exhausted from a
cylinder chamber 56, through a passage 68, into 20
the valve chamber 66, and out through a pipe 69
which exhausts into the reservoir 6|.
The valve stem 63 is held in a forward feeding
position (Fig. 2) by means of an electric solenoid
15 which is connected by a link 16 and a stud 11
to the lower end of a pivotally mounted lever 18
supported on a stud 19. The upper end of the
lever 18 is connected by a pin or. stud 80 with a
spool shaped member 8| mounted on the outer
end of the valve stem 63. When the solenoid 15 30
is energized, the valve 58 is held in position illus
trated in Fig.2. When the solenoid 15 is deen--v
ergized, the released compression ‘of a spring 82
within the end of the valve casing serves to move
the valve 58 quickly toward the right (Fig. 2) to -
reverse the position of the valve and to reverse
the ?ow of ?uid to and from the chambers 56 and
51 of the cylinder 53. The electrical apparatus
for controlling the solenoid 15 will be described
hereinafter.
~
Dash pot
The piston 54 and cylinder 53 mechanism,
40
above described, serves to cause the grinding
wheel 34 rapidly to approach or recede from the
work piece. In order to reduce the rapid ap 45
proaching movement to a predetermined grinding
feed, it is desirable to provide a wheel feed regu
lator or controlling mechanism, such as a- dash
pot mechanism, which may be rendered effective
when the grinding wheel 34 is about to contact 50
with the surface of the work piece being ground.
As illustrated in Fig. 2, an outwardly projecting
casing 85 is ?xed to the head of the cylinder 53
and contains a pair of diametrically spaced dash
pot pistons 86 and 81. The dash pot pistons 86 55
and 81 normally are held in a rearward position
by springs 88 and 89 respectively. During the
rapid approach of the grinding wheel 34, the dash
pot pistons are inoperative.
The piston rod 55 extends toward the rear of 60
the machine and is provided at its outer end
with a sleeve 9| which may be adjusted longitu
dinally on a threaded portion 92 on the piston rod
55 and locked in adjusted position thereon by a
lock nut 93.
The parts are 50 arranged that the 65
sleeve 9| moves rearwardly when the piston rod‘
55 moves toward the rear. The dash pot pistons
86 and 81 are limited in their rearward movement
by means of adjusting screws 94 and 95, respec
tively. When fluid under pressure is admitted to 70
the cylinder chamber 51 to cause the grinding
wheel 34 to move toward the work piece, the
rapid approaching movement thereof continues
until the end of the sleeve 9| engages the ends
of the dash pot pistons 86 and 81, respectively.
'3
2,117,917
The continued movement of the piston 54 toward
. the left (Fig. 2) is resisted by the dash pot pistons
88 and 81, respectively, which forces ?uid under
pressure from the dash pot chambers 91 and 98
into a reservoir 99. The‘ dash pot chambers 91
and 98 are preferably interconnected with each
other by the groove I02 and are arranged to ex
haust ?uid therefrom either through a needle
valve I00 or an adjustable throttle valve IOI into
heads H5 and H8 are mounted on a swivel table
II9 which is provided on the work supporting
table 2I. The work heads H5 and H8 rotatably
support a pair of aligned work supporting andro
tating spindles H1 and H8, respectively.
The table 2I is provided~with the usual swivel
table II9 which is arranged to pivot on a central
stud I20 set in the table 2I and projecting into
a corresponding shaped aperture I2I in the swivel
table H9. The upper surface of the swivel table 10
I I9 is formed with a dovetailed surface I22. The
ably is located on front of the machine Fig. 1.
work head I I5 is provided with a dovetailed sur
Positive stop
face I23 which mates with the surface I22 on
the swivel table II9. A clamping block I24 held
In order to grind a work piece to a predeter
mined size, it is necessary to feed the grinding - in position on the work head II5'by a clamping 15
15
wheel 34 toward the work piece to grind the same screw I25 serves securely to lock the head H5 in
10 the reservoir 99.
The throttle valve II'II prefer
and then to stop the infe'ed and allow the grind
ing wheel 34 to grind out or to allow the sparks
position thereon. Similarly, the head I I8 is pro
to die out in order to round up the work so that
it will be ground to a true cylindrical surface of a
with the surface on the swivel table H9, and a
clamping block I21 and clamping screw I28 se 20.
vided with a dovetailed surface I28 which mates -
casing 85, thereby positively limiting the infeed
curely clamp the work head H8 in position on
the swivel table H9.
The spindles H1 and H8 are provided with a
suitable driving mechanism so that they may be
rotated in synchronism with each other so as to
provide a uniform timed driving of opposite ends
‘of the work piece. In the construction illus
ing movement of the grinding wheel 34 and caus
ing the wheel to dwell in contact with the work
left-hand end of the swivel table H9. The mo
predetermined size. As illustrated in Fig. 2, the
forward movement of the piston rod 55 causes a
rapid approach until the sleeve 9I picks up the
dash pot pistons 88 and 81 to cause a slow in
feed
which continues until. an adjustable sleeve
25
I04 engages a fixed surface I05 on the rear of the
30 during the ?nish grinding period. The adjust
able stop sleeve I04 surrounds the sleeve 9I and
is held in adjusted position thereon by means of
lock nuts I08.
.
The throttle valve' IN is connected by a pipe
35 I08 with the reservoir 99. The pipe I08 also
connects the reservoir 99 to a ball check valve
I09 which remains closed during the forward
feeding movement of the grinding wheel but
which is opened upon the rearward movement of
the grinding wheel 34 as the dash pot pistons 88
v
trated an electric motor I34 is mounted on the
tor I34 is provided with a motor shaft I35 con
nected by a coupling I38 with a rotatable shaft
I31 journaled in bearings I38 and I39 in the
head H5. The shaft I31 carries at its inner '
end a gear 'I40 which meshes with a gear I“
mounted onwthe end of a rotatable shaft I42. 35
One end of the rotatable shaft I42 is journaled in
a bearing I43 in the head H5 and the other end
of the shaft I42 is journaled in a bearing I44 in
the head H8. The shaft I42 is connected- to
simultaneously rotate the spindles H1 and “8,. 40
40 and 81 move to a rearward position to allow. respectively. A sprocket I45 is keyed on the
quick return of fluid to the dash pot chambers left-hand end of the shaft I42 (Fig. 4) and is
connected with a sprocket I48 on the work spin
91 and 98, respectively.
die I I1 by means of a link chain I41. An adjust
The dash pot mechanism is normally an inde
ably mounted idler sprocket I48 serves to take up _ 45
pendent fluid mechanism during the normal oper
ation of the machine. In order readily to fill
the reservoir 99 to maintain the desired quan
tity of ?uid therein, a pipe H0 is connected be—_
tween the pump 59 and reservoir 99. A valve
III is located in the pipe IIO to control the ?ow
of fluid through the pipe IIO. An‘ over?ow pipe
H2 is connected between the vertically extend
ing portion of the reservoir 99 and the main
reservoir 8I within the base '20 of the machine
so that in case the fluid within the reservoir 99
rises above a desired level, the excess ?uid will
return directly to the reservoir within the base
of the machine. Ordinarily the valve III‘ is
, merely opened when it is desired to ‘fill the reser
voir 99 andrthen remains closed during the nor
60 mal operation of the machine. If desired, how
ever, in order to insure the ‘?uid level within the
reservoir 99 at all times, the valve III may be
opened partially so that there will be a con
tinuous flow of fluid into the reservoir 99, and in
65 this case the overflow pipe II2 serves to prevent
the fluid level rising above the desired point. '
Work supporting and rotating mechanism
- In order to grind the entire peripheral surface
70 of a work piece automatically, it is desirable to
provide means for supporting and driving the
opposite ends of ‘the work piece to center and
support the work piece as well as to rotate it
during the grinding operation. In the construc
75 tion illustrated, a pair of spaced work supporting
any lost motion in the chain I41 and to maintain the chain in the desired driving tension.
Similarly, the other end of the shaft I42 is
provided with a sprocket I50 which is connected
with a sprocket I5I mounted on the rotatable
work ‘spindle II8 by means of a link chain I52.
An idler sprocket I53 serves to tension the link
chain I52 as desired. By means of this driving
mechanism, the work supporting and rotating
spindles H1 and H8 may be rotated in synchro- >
nism with each other.
It isdesirable to provide a suitable adjustment
in the driving mechanism so that the two spin
dles having specially shaped work supporting
and driving centers may be timed accurately with
each other and thereafter rotated in absolute
synchronism with each other. To accomplish
this‘result, the sprocket I50 is not ?xed to the
shaft I42 but is rotatably supported thereon. A
plate I55 is mounted on and ?xed to a hub pro
65
jecting from the sprocket I50. The plate I55
is mounted on and ?xed to a hub projecting from
the sprocket I50.
The plate I55 supports a
driving stud I58 which is arranged to drive a
plate I51 which is ?xedly fastened to the end of 70
the drive shaft I42. The plate I51 is provided
with a cut-out. portion I58 which is of sufficient’
size and width‘ to allow freedom of movement
and adjustment of the stud I58 carried by the
plate I55. The cut-out portion I58 provides a 76
w
4
2,117,917
pair of opposed adjusting screws I6I and I62
which are carried by the‘projections I59 and I60,
respectively, on the plate I57 and serve to engage
opposite sides of a squared end portion of the
stud I56. By slacking OH on one of the screws
I 6| or I62 and tightening the other screw, the
plate I55 may be adjusted angularly relative to
the plate I57 so as to time the work supporting
spindle I I8 in the desired relationship with the
10 work supporting spindle I I7.
In order to clamp or lock the plates I55 and
I57 in adjusted position, a pair of clamping
screws I63 and I64 are provided.
These screws
pass through elongated slots I65, I66 in the plates
15 I57 and are screw threaded into the plate I55 so
that the two plates may be rigidly locked in ad~
justed position when desired, thus permitting
timing of the work spindles.
Work spindles
The two aligned opposed work supporting
heads H5 and IIS are substantially identical in
construction, the only difference being that one
is a right-hand and the other a left-hand head.
Consequently, only one oi these heads has been
shown in detail in cross section. It should be
understood, therefore, that the right-hand head
(Fig. 3) is identical in construction and descrip
tion with that described and illustrated incon
nection with the left-hand head. A collar III)
is threaded onto the end of the spindle II ‘I and
as by means of a ?ange I90 which is provided
with an integral hub I 9| that is connected to
the sleeve I78 by a screw I92 havinga cylindrical
end portion thereon engaging an elongated slot
in the sleeve I78. The flange I90 is positioned
within a recessed portion I93 in the left-hand
end of the piston I86 and is located between the
bottom of the recess I93 and a plate I94 which is
fastened on the end of the piston I86. A collar
I95 is fastened on the end of the sleeve I78 by
means of a screw I96. The collar I95 is pro
vided with an adjusting screw I97 which is ar
ranged parallel with the sleeve I78 and which
serves to adjust the amount of lost motion be
tween the piston I86 and the ?ange I90.
The
piston I86 is arranged "so that the sleeve I78 ro
tates therewithin and ‘the lost motion connection
between the piston and the sleeve I78 serves to
allow the spindle to be rotated and the sleeve I78
to rotate freely without any friction between 20
the ?ange I90 and the piston I86. The springs
I87 serve normally to hold the piston I86 in the
position illustrated in Fig. 4, that is in a position
toward the right, bearing against a thrust collar
I98 which is ?xedly mounted within and at one ‘ '
end of the cylinder I85.
It will be readily apparent from the foregoing
disclosure that the slidably mounted sleeve I75
within the work supporting spindle I I7 is normal
ly held in a position toward the right, that is, in ‘
operative position to support and drive a work
contains a plurality of springs III which are ar
piece I88 by means of the spring I79. The pis
ranged automatically to apply a tension to the '
ton I86 is normally held in a position toward
parts of the anti-friction ball bearings I38 and
IBI so that lost motion between the bearing parts
is taken up at all times during the operation of
the machine.‘
For convenience of assembly and manufacture.
"the spindle M7 is formed in two parts compris
ing the outer part Ill and an inner sleeve I72
which has a flange IE3 engaging a corresponding
ly shaped aperture in the spindle III.
The
other end of the sleeve I72 is threaded and a col
lar I78 ?tted thereon serves to lock the spindle
46 II‘I and sleeve I72 so that they rotate together.
'A sleeve I85 is slidably keyed within the sleeve
I72 by means of a'key I76. The outer end of the
sleeve I75 is provided with a tapered aperture
adapted to receive the tapered portion of a work
50 supporting and driving center I'M. A sleeve I78
within the sleeve I75 serves to locate a spring
I79. >The spring I79 is located between a ?ange
on the sleeve I78 and a collar I80 which is screw
threaded within the sleeve I72.
The compression
55 of the spring I79 serves normally to hold the
work supporting and driving center I77 and its
supporting sl?eve H5 toward the right (Fig. 3)
into a driving position, as illustrated therein.
A ?uid pressure cylinder '85 is formed either
60 integral or ?xedly mounted on the end of the
work head H5. The cylinder I85 contains a pis
ton I86 which is slidably mounted therein and is
normally held in a position toward the right,
(Fig. 3) by two springs I87 to aid in moving and
' holding the work supporting center I77 in a di
rection toward the right to support and drive a
work piece I88 having ‘a plurality of broached
splines therein.
_
To retract the center I77, ?uid under pressure
70 may be admitted to a cylinder chamber I89 with
in the cylinder I85, which serves to cause the
sleeve I75 to be moved toward the left (Fig. 3)
against the compression of the spring I79.
75
I
The piston I86-is preferably connected with
the sleeve I78. by a lost motion connection, such
the right against the ?anged portion I98 at the
end of the cylinder I 85 by means of the springs
I8'I. When it is desired to retract the center
after a work piece I88 has been ground, ?uid
under pressure is admitted to the cylinder cham
ber I89 to move the piston I86 toward the left
against the compression of the springs I87 and L
to retract the sleeve I75 toward the left against
the compression of the spring I79 to withdraw
the work supporting and rotating center I77 to
an inoperative position. The ?uid pressure sys
tem for controlling the admission of ?uid to the
cylinder I85 will be hereinafter described.
Similarly, the right-hand head H6 (Fig. 3) is
provided with a spindle and sleeve construction
identical with that above described in connection
with the left-hand head ~H5. The right-hand
head H6 is provided with a cylinder 200 having
a piston 20I slidably mounted therein. The pis
‘ton 20I is normally held in the position illus
trated in Fig. 3, up against a ?ange or thrust
plate 202 (Fig. 4), ?xed to the inner end of the ;
cylinder 200, by means of two springs 203. A
lost motion connection is provided to connect
the piston 20I to a sleeve 204 within the spindle
II8. This lost motion connection comprises a
?ange 205 having a hub 206 formed integral
therewith. ‘The ?ange 205 is located within a
recess 207 within the piston 20I and the ?ange
205 is located between the bottom of the recess
207 and a plate 208 partially covering the end of
the recess 207. The hub 206 is provided with a
screw 209 which has an inwardly projecting por
tion sliding within an elongated slot in the sleeve
204. A collar 2I0 is ?xedly mounted on the end
of the sleeve 204 by means of a screw 2H and is
provided with an adjusting screw 2I2 arranged To
to engage the ?ange 205 and adjust the position
of the ?ange 205 relative to the sleeve 204 and
thereby adjust the amount of lost motion be
tween the ?ange 205 and the piston 20I.
‘
The spindle H8 is provided with an inner longi
5
2,117,917 L
work supporting and rotating centers I11 and 2 I4,
respectively, and similarly to discharge work
therefrom after a grinding operation has been
tudinally slidable sleeve 2I3 similar to the sleeve
I15 in the work head II5, which in turn sup
ports a work supporting and rotating center 2I4
similar to the center I 11. The spindle IIB has
anti-friction ball bearings I32 and I33, similar
to bearings I38 and I3I in the work head H5, and
the take-up for lost motion is the same.
Since both of the work supporting centers I11
and 2I4 are arranged for endwise movement to
11 ward and from each other to grip and release
a work piece I88 which is held thereon and there
between for a grinding operation, it is desirable
to provide suitable elements which may serve both
to locate the work piece I88 in a predetermined
completed thereon. In order to reduce the idle
time of the machine during the loading and un
loading operation, it is desirable to provide a suit
able work loading device'whereby a new unground
work piece I88 may be picked up from a maga
zine or hopper simultaneously with the gripping
of the ground piece of work and the work loader 10
then moved to shift the ground piece of work to a
' position with relation to the grinding wheel 34
and which also may serve as strippers to hold the
15
single movement of the work carrier or loader.
In the construction illustrated, a work hopper
or magazine 221- carrying a plurality of un
Work piece I88 against endwise movement during
the withdrawal of the work centers I11 and 2I4.
A sleeve 2 I 5 surrounds the slidable center support
ing sleeve 2 I3 on the work head I I6. A ?ange 2I6
is formed integral with the sleeve, 2I5 and is
?xedly secured to rotate with the spindle I I8.
The end face of the sleeve 2I5 serves to locate the
right-hand end of the work piece I88 when
gripped between the supporting centers I11 and
2I4.
In order to compensate for any slight variations
in the length of successive work pieces I88, a
sleeve 2I1 surrounds the longitudinally adjustable ‘
‘ sleeve I15 of the work head I I5. The sleeve H1 is
discharge position while moving the unground
piece of work into alignment with the center,
thereby unloading and loading the machine in a
ground pieces of work I88 is
bracket 228 ?xed to the work
H5 and H6 (Figs. 5 and 17).
the work discharge chute 221
supported by the
supporting heads
The outer end of 20
is similarly sup
ported by an inverted V shaped supporting frame ‘
229 which is adjustably connected to a bracket
230 which connects the heads H5 and H6. The
frame 229 is provided with elongated slotsthrough 25
which clamping bolts pass and which are ar
ranged to clamp the frame 229 in adjusted posi
tion on the supporting bracket 230. By adjust
ing the frame 229 vertically, the angular posi
tion of the work magazine or hopper 221lmay
be varied as desired so that the successive work
so.
provided with an integral ?ange 2I8 which is
?xedly mounted on the end of the spindle II1
to rotate therewith. In order to compensate for
pieces I88 will roll in succession into an operat- ,
any slight variations in length of successive work -
the outer ends of the heads H5 and H6 is pro
vided with an inwardly extending boss 23I (Figs. 35
pieces I88, a second sleeve 2I9 is slidably mount
cd within the sleeve 2" and is normally urged‘
toward the right (Fig. 4) by means of equally
spaced springs 220. A plurality of balls 22I ar
ranged in spaced relationship are interposed be
tween the sleeves 2I1 and 2I9 to allow the inner
sleeve 2I9 to slide freely therewithin and also
serve to drive the sleeve 2I9 with the sleeve 2".
A band 222 mounted in a recess in the sleeve 2I1
maintains the balls ‘MI in driving position. The
end face of the sleeve 2I9 engages the left-hand
end of the work piece I88 (Figs. 4 and 11) and
serves when the sleeves I15 and 2I3 are moved
toward each other to grip a work piece I88 to
move the work piece endwise so that its right
hand end engages the end of the sleeve 2I5.
Due to the springs 228, the sleeve 2I9 may yield
relative to the sleeve 2I1 to compensate for any
slight variations in the length of successive work
pieces I88.
The sleeves 2 I5 and 2 I 9 also serve as strippers to
hold the work piece I88 against endwise motion
ing position. The bracket 230 which connects
3 and 5) which serves as a support for a pivot
shaft 232 which passes through an aperture with
in the boss 23I and is held in adjusted position
therein by means of a set screw 233.
A work carrier frame 235 is provided with a 40
pair of spaced downwardly extending arms '235
(Fig. 1) which have enlarged hubs 231 and 238,
respectively,'at their lower ends, each of which is
provided with a bushing or bearing member 239
and 240, respectively, which are pivotally sup 45
ported on the non-rotatable shaft 232 and serve
to permit the work carrier frame 235' to be rocked
about the shaft 232 as an axis.
'
The work carrier frame 235 is provided with a
longitudinally extending fluid pressure cylinder 50
245. A piston 246 is slidably mounted with
in the cylinder 245.‘ -A piston rod 241 is ‘formed
integral with the piston 246 and passes through
a cylinder head 248 having a ?uid tight ‘packing,
which serves as a bearing support for the piston 55
rod 241. A circular slide cover 249 is fastened
on the outwardly projecting end of the piston rod
when the sleeves I 15 and 2I3 are withdrawn to
241 by means of a nut 250 threaded onto the end
release a ground piece of work I88.
vIn order to hold the work supporting centers of the piston rod. A work carrier head 25I is
I11 and 2I4 in position within the sleeves I15 ?xedly mounted on the slide cover 249 so as to
and 2I3, a rod 223 having a head 224 extends move therewith. The work carrier head 25I is
provided with a pair of spaced plates 254 and 255
within the sleeve I18 and is screw threaded into
(Fig. 16) having spaced pockets 252 and 253
the tapered portion of the center I11 so as to lock
formed therein which are of a diameter substan
the center I11 in ‘a de?nite operating position.
Similarly. a rod 225 having a head 226 extends tially equal to the piece of work I88 to be ground 65
and are spaced apart by a distance substantially
through the sleeve 204 and is screw threaded into
equal to the spacing between the piece of work
the center 2I4 to lock the same in an operative
I88a in the lower portion of the hopper 221 and
position within the sleeve 2I3. ‘
Work magazine or hopper
In a machine of this type, in order to make it
fully automa‘ic in its cycle of operation, it is de
sirable to provide a work feeding and discharging
mechanism for automatically conveying succes
sive work pieces into alignment with the opposed
the work piece I88, which is mounted on the
centers I11 and 2M and has been ground to a 70
predetermined size.
I
In order to maintain the work carrying hea
25I and its associated parts in a vertical position
during the movement of the piston 246, 'a slide
block 243 is ?xedly attached to a slide cover 249
75
6
2,117,917
which surrounds the cylinder head 248.
The
slide block 243 is slidably supported on a cylindri
cal surface on the front end of the work carrier
frame 235 and the cylinder head 248. The slide
block 243 and the slabbed-of‘f surface 244 on the
frame 235 serve as a guide to maintain the work
carrying head 25! in an operating position and
prevent rotation thereof with the piston 246.
A pair of pivotally mounted spring actuating
10 ?ngers 256 and 251 are provided on the work
carrying head 25I which serve to hold a work
piece I88 within the pockets 252 and 253 during
respectively, which project inwardly toward each
other.
The heads of the 299 and 29I screws
serve to bear against the work piece I88a to hold
the same within the hopper 221 until it is gripped
and transferred therefrom by the forward and
downward movement of the work carrying head
25L A spring 292 is interposed between the
upperv end of the lever 286 and a portion of the
bracket 228 supporting the hopper 221 and serves
normally to hold the lever 286 in the position il 10
lustrated in Fig. 5, with the head of the screw
299 engaging the work piece l88a. An adjust
the transfer movement from the magazine or able stop screw 293 serves to limit the rocking
hopper 221 to the work centers I11 and 2M and ' movement of the lever 286 in a clockwise direction
(Fig. 5) and similarly an adjustable stop screw
15 from the work centers‘to the discharge chute.
The ?ngers 256 and 251 are pivotally mounted 294 serves to limit the rocking movement of the
on the upper part of the plates 254 and 255 of arm 286 in a counterclockwise direction. The
the work carrier head 25l by means of studs 258 arm 2841 is similarly mounted, so that a spring
and 25.9 to grip and hold the work-piece I88a 295 normally rocks the lever 281 in a counter
20 therein. Similarly, a pair of spring actuated trip clockwise direction (Fig. 3) to maintain the screw
?ngers 269 and 26I are arranged on opposite 29I in position to support the work piece I88a in
sides of the lower part of the plates 254 and 255, position with the work carrier pockets 252. An
respectively, and pivotally supported thereon by
adjustable stop screw 296 carried by the lever 281
studs 262 and 263 and positioned to hold a ?nish
25 ground work piece I88 ‘within the pockets 253 so
as to transfer it to a discharge position.
serves to limit the rocking movement of the lever
in a counterclockwise direction, Fig. 3. Similarly,
a stop screw 291 carried by the lever 281 serves to
The ?nger 256 is normally held in the position limit the rocking movement of the lever 281 un
illustrated in Fig. 5 by means of a spring 265 , der the in?uence of the spring 295 in a clockwise
which is connected between a stud 266 carried by direction (Fig. 3). It will thus be seen that by
30 the plate 254 and a stud 261 mounted on the means of the spring actuated, pivotally mounted 30
?nger 256. An adjustable stop screw 268 carried levers 286 and 281, the heads of the screws 299
by the ?nger 256 together with a stop pin 269 and 291 engaging the lower workpiece I88a in
mounted on the work carrier head 25l serves to the hopper, 221 serve to retain the work piece in
limit the movement of the ?nger 256 in a counter
this position until the same is grasped by the
pockets 252 on the forward movement of the
35 clockwise direction.
The ?nger 251 is held in a similar position by - work carrier head 25I.
means of a spring 212 which is fastened at one
The work carrier head and associated parts,
end to a stud 213 carried by the plate 255 and as shown in Fig. 5, are in a grinding position, that
fastened at its other end to a stud 214 on the is the grinding wheel 34‘is in engagement with
?nger 251. An adjustable stop screw 215 carried the work I 88 and the work is ground substantially 40
40
by the ?nger 251 and a stop pin 216 serve nor
to size. After completion of grinding on the
mally to hold the ?nger 251 in position to sup
port a work piece I88 in the pocket 252. The
tension'of the springs 265 and 212 is sufficient
to hold a work piece I88 in the pocket 252 when
45
the work carrier head 25I is moved forward and
. to withdraw the same from the hopper 221 when
the work carrier 25I is swung' to discharge a
ground piece I88 and present a new piece of
work I88a into alignment with the work centers
50 I11 and 2“.
work piece I88, the work carrier head 25I is
preferably moved in a substantially horizontal
plane so that the pockets 252 grip the work piece
|88a and the pockets 253 grip the ground work
piece I68. The work carrier 25I and its associated
parts are moved forward to grip the groundwork
piece I88, as shown in Fig. 6. The work car
rier head 25l and" associated parts are then
rocked about” the shaft 232 as a pivot to swing 50
‘
the ?nished ground work piece I 88 into position
The ?ngers 269 and 26 I‘ ‘are similarly arranged, , l89b (Fig. 7), in alignment with the upper end
each having a spring 218 interposed between of a discharge chute Y399 and at the same time
Studs 219 on the plates 254 and 255 and a stud swings the work piece I88a into position I 88 in
289 on the upper surface of each of the ?ngers
55 269 and 261 normally tending to hold‘the ?ngers alignment with the work supporting and rotat 55
ing centers I11 and 2“. The work carrier 25I
in the position illustrated in Fig. 5, with the ad
and its associated parts, while in a tilted posi
justable stop screw 28l in engagement with a stop tion, are then withdrawn from the position shown
pin 282 carried by the plates 254 and 255.
in Fig. 7. As the work carrier head 25I recedes
The hopper 221, as illustrated, comprises a from the position in Fig. 7, a pair of ,lugs 391 60
trough of a box-like cross sectional area having
a portion of the top out out. The inner cross
sectional area of the carrier is of sufficient size
to allow a'free rolling movement of the work
65 pieces I88 as they are placed in the machine.
and 392 on the discharge chute 399 engage the
ground work piece I88!) and hold it in the upper
end of the discharge chute as the work head 25I
recedes from the work. During this movement,
the gripping ?ngers 269 and 26l are rocked 65
The outer portion of the hopper 221 is arranged about their studs 262 and 263 to release the
in an inclined manner so that the work pieces
work piece |88b from the pockets 253 into the
will roll toward the dischargeiend of the hopper. discharge chute 399 whereupon the ?nished
The ?rst work piece I88a in the hopper 221 rests ground work piece I88 rolls by gravity to the
70 on a surface 285 at the lower end of the hopper pan 393 carried by the table 2| on the front of 70
221 and is held in position therein by a pair of the machine. Excess coolant ?uid is exhausted
spaced pivotally mounted arms 286 and 281 which
through the ?exible hose 394 into the coolant
are pivotally mounted on studs 288 and 289, re
reservoir in the base 29 of the machine.
spectively (Fig. 16) . The lower end of each arm
Similarly, before the work carrier 25I starts its
rearward movement, that is, toward the left
75 286 and 281 is provided with a screw 299 and 29I
7
2,117,917
(Fig. 7), the work gripping centers I11 and 2“
have gripped the work piece I88 and the with
drawal movement of the work carrier headp25I
rocks the ?ngers 256 and 251 to withdraw the
pockets 252 from engagement with the new piece
of work I88 to be ground. The work carrier head
25I and its associated parts then assume the
position illustrated in Fig. 8, after which the work
carrier 25I and parts are rocked in a counter
10 clockwise direction to return into the normal po
sition of the parts, as shown in Fig. 5, ready for
the next cycle of movement thereof.
The movement of the work carrier 25I simul
taneously to. pick up a new piece of work I88a
15 to be ground and the piece of work I88 which
has been ground and simultaneously to shift
them into an operating position and a discharge
position, respectively, serves to reduce the idle
movement and thereby increase the production
The movement of
‘the work carrier head 25I is preferably hydrau
lically actuated by means of a pair of pistons and
20 and e?lciency of the machine.
vcylinders, one of which moves the work carrier
in a horizontal position and the other of which
25 serves to rock the work carrier to transfer the
work pieces, as above described. These two cyl
inders and pistons are interconnected so that they
operate in timedrelation with each other.
In the position of parts as shown in the dia—
30 gram in Fig. 2, ?uid under pressure, from the
pump 59, passes through the pipe 62 into the
chamber 65 of the valve 58 and passes out through
a pipe 385, a section of which is ?exible hose to
allow free rocking of the work carrier frame 235,
35 through a passage 386 in a valve 381, through a
pipe 383 and'a valve 389 and a pipe or passage 3I8,
into a cylinder chamber 3“ within the cylinder
245 to move the piston 246 together with the
piston rod 241 and plate 248 carrying the work
carrying head 25I toward the left, (Figs. 2 and
40
5) to, withdraw the work carrying head 25I into
its rearward or inoperative position as shown.
During the movement of the piston 246 toward
the left, ?uid withina cylinder chamber 3| 2
cylinder chamber 325, which serves to produce a
downward movement of the cylinder 3I6 and the
work carrier frame 235, the piston 3" being
held ?xed to the bracket 238 to swing the work
carrying frame 235 from the position illustrated
in Fig. 8' into the position illustrated'in Figs. 2
and 5. During the downward movement of the}
cylinder 3I6, ?uid is exhausted from a cylinder"
chamber 326, through a pipe or passage 321,
through radially extending holes 328 in the cyl 10
inder 245 and through longitudinally arranged .
holes 329, which extend to the circular groove
which connect with the holes 328 within the pis
ton 246. Fluid under‘ pressure passing there
through moves the collar 338, compressing a 15
spring 33I and thereby allowing ?uid passing
through holes 329 to enter the cylinder chamber
3I2 and exhaust through pipe or passage 3I3, as
above described. Normally the collar 338 seals
the holes 328 when ?uid is admitted into the 20
chamber 3I2 to move the piston 246.
The valve 381 is normally inoperative and re
mains in the position illustrated‘in full lines in ~
Fig. 2, except when it is desired to set up the
work carrying head 25I and its associated mecha 25
nism when the same may be manually operated to
move the work carrying head 25I independent of
the other mechanisms of the machine.
When the wheel feed control valve 58 is shifted
into its reverse~ position, the direction of ?ow of 30
?uid under pressure to the cylinder 245 is changed
so that ?uid under pressure passes through the
pipe 3I3 into the cylinder chamber 3I2 to cause
the piston 246 to move'toward the right (Figs.
2 and 5) so as to move the work carrying head 35
25I into the position illustrated in Fig. 6. The
?uid in the cylinder chamber 325 is exhausted
through the passage 324 into the radially extend
ing holes 332 in the cylinder 245 through the
longitudinally equally spaced holes 333 which ex
tends to the continuous groove, and connects -
with the holes 332, within the piston 246, which
moves the collar 334, compressing the spring 335,
thereby allowing ?uid passing through the holes
exhausts through a pipe or passage 3I3 and a 333 to enter the cylinder chamber 3“ and ex
45 valve chamber 314 in the valve 381 and passes I haust through the pipe or passage 3l8, so as to
through a pipe 3I5, a section of which is ?exible
hose to allow freerocking of the work carrier
frame 235 to the valve chamber 66 in the valve
56 and through the exhaust pipe 69 into the res
-50 ervoir 6|.
The valve 389 is adjusted to regulate the load
ing and discharging speed of the work carrying‘
head 25I to time it with the movement of the
work centers I11 and 2“ and also to reduce the
force of the blow of the piston 246 at each end
of stroke to obtain smoT'thness and quietness of
operation.
Inorder to rock the'work carrying head 25I to
move a work piece I88a from the hopper 221 into
alignment with the work gripping centers I11 and
2“, and to transfer a work piece I88 from the
,work centers to the discharge chute 388, a ?uid .
pressure cylinder 3I6 is ?xedly mounted on the
outer end of the work carrier frame 235 and is ar
65 ranged in a substantially vertical position, at
right angles to the cylinder 245. The cylinder
3I6 contains a piston 3| 1 which is connected by a
piston rod 3I8 and a grooved spool shaped mem
ber 3I9 with a pair of opposed shoes 328 and MI
70 which engage the groove in the spool shaped
member 3I9 and are pivotally supported by trun
nions 322 and 323 on the bracket 238.
75
move the work carrying head 25I into the position
illustrated in Fig. '7, simultaneously transferring
a ground piece of work I88 into the opening of
the discharge chute 388 and transferring a new
piece of work I88a‘ from the hopper 221 into
alignment with the work gripping centers-I11 and
2I4.
As soon as the work centers have gripped .
the work I88, as hereinafter described, the feed
valve 58 is again shifted, by energizing the sole 55
noid 15, into the position illustrated in Fig. 2,
in which position ?uid- under pressure causes a
rearward movement of the work carrying head
25I into- the positionlillustrated in Fig. 8, after
which ?uid is admitted to the cylinder chamber
325 again to rock the work carrier head 25I into _
the position illustrated in Figs. 2 and 5.
Electrical control and interlock
In a machine of this type, it is desirable to 65
provide suitable interlocks between the various
mechanisms of the machine‘to insure safe opera
ticn thereof, without endangering the-operator‘,
or damaging the work pieces I88 passing there
through. It is desirable to provide an electrical 70
interlock between the work gripping centers I11
and 2I4 and the wheel fccd control valve 58 so
that the solenoid 15 cannot‘ be energized-unless
Fluid under pressure entering @the cylinder boih of the work gripping centers are in an oper
chamber 3“ passes through a passage 324 into a > ative position in engagement with the work piece 75
8
2,117,917
.
I88 to be ground. The mechanisms of the ma
chine, as shown diagrammatically in Fig. 2, are
in a grinding position. The trip switch 336 is
normally held in a closed position by means of a
spring 331. An actuating plunger 338 is ar
ranged in the path of an adjustable screw 339
carried by a pivotally mounted lever 348 mount
ed on a stud 34I ?xed to the end of the cylinder
I85 of the work head II5. A rod 342 is ?xed to
ing and the other ends of which are fastened to
studs 313 and 314 on the rock arm 364. These
springs normally tend to rock the rock arm 364
in a counterclockwise direction. A cylinder
chamber 315 within the valve 368 is connected
by a pipe 316 with a passage 311 in a cycle tim
ing valve 318. The passage 311 is connected by
a ball check valve 319 with a passage 388 which
enters a valve chamber 38I within the piston
10 the piston I86 and projects through an aperture
within the end cover of the cylinder I85 and is
arrangedxto engage the lever 348. A spring 343
having one of its ends connected to the upper
10
type cycle timing valve 318.
The pipe 316 leading from the cycle timing
end of the lever 348 and its other end connected
15 to a stud 344 ?xed to the top of the cylinder
I85 serves normally to maintain the lever 348 in
engagement with the rod 342. In the position
pipe 383 to exhaust ?uid into the reservoir 6I.
A valve 384 is located in the pipe line 382 and 15
serves to close off the exhaust from the cycle
timing valve when desired in setting up the ma
chine for grinding a given work piece I88. An
adjustable throttle valve 385 is also located in
the pipe line 382 and serves to adjust and con 20
trol the rate of exhaust from the cycle timing
of the parts shown, Fig. 2, the switch 336 is
closed.
When ?uid under pressure is admitted
piston and cylinder 368 also connects with a pipe
382 which in turn is connected with an exhaust I
to the cylinder chamber I89 to cause the piston
I86~ to move toward the left to withdraw the
work centers I11 and 2I4 to an inoperative posi , piston and cylinder 368 and thereby to control
the cycle of operation. Whenthe ?uid is ex
tion, the rod342 rocks the lever 348 in a coun
hausted from the chamber 315 in the cycle tim
ter-clockwise direction, which serves to move the
25 switch actuating plunger 338 toward the left, ing piston and cylinder 368 by the piston 361, 25
‘Fig. 2, to trip the switch 336 and thereby break the ball check valve 319 is closed by back pres
sure of the ?uid so as to allow ?uid to exhaust
the circuit.
only through the pipe 316 to the needle valve
A similar safety connection including a nor
mally closed trip switch 345 is normally held in 385 in the pipe line 382 to exhaust through the
30 a closed position by means of a spring 346.
An
actuating plunger 341 is arranged in the path of
V an adjustable screw 348 carried by a pivotally
mounted lever 349 mounted on a stud 358 ?xed
to the end of the cylinder 288 of the work head
II6. A rod 35I is ?xed to the piston 28I and
projects through an aperture within the end
cover of the cylinder 280 and is arranged to" en-,
gage the lever 349. A spring 352 having one of
its ends connected to the upper end of the lever
349 and its other end connected to a stud 353
serves normally to maintain the lever 349 in en
gagement with the rod 35I. In the position of
-the parts shown in Fig. 2, the switch 345 is
closed. When ?uid under pressure is admitted
to the cylinder chamber 2I2 to cause the piston
2III to move toward the right (Fig. 2) to with
draw the work center 2I4 to an inoperative posi
tion, the rod 35I rocks the lever 349 in a clock
wise direction which serves to move the switch
actuating plunger 341 toward the right (Fig. 2)
to trip the switch 345 and' thereby break the
circuit.
A similar trip switch 368 is operatively con
nected to be actuated by a cycle timing valve
to_be hereinafter described.
The switch 368
is normally held in an open position by means
of a spring 36I and is provided with an actuating
plunger 362 which is arranged in the path of an
adjustable screw 363 which is mounted in they
. upper end of a rock arm 364.
The rock arm 364
is pivotally mounted on a stud 365. The lower
end of the rock arm 364 is arranged to engage
a plunger 366 which extends from and is formed
integral with a piston 361 of a cycletiming cyl
1 inder. 368.
Cycle timing piston and cylinder
, The cycle timing piston and cylinder serves to
control the admission of ?uid under pressure to
the work head actuating cylinders in timed rela
tion with the other mechanisms of- the machine.
The piston. 361 is normally held in a right-hand
position (Fig. 2) by means of a pair of springs
'369 and 318 which are connected between studs
3" and 312, respectively,v on the cylinder cas
pipe 383.
30
Cycle timing valve
The cycle timing valve 318 is preferably a
pistontype valve comprising the valve pistons
386, 381, and 388 which are formed integral with
a valve stem 389, thus forming valve chambers 35
398, 38I, 392, and 393.
As shown in Fig. 2, ?uid under pressure from’
the pump 59 passes through the pipe 62 and
through a pipe 394 which connects with the valve
318. In the position of parts as shown, the valve (0
piston 386 closes the port for the pipe 394. Fluid
under pressure passing into the main control
valve 58 passes out through a pipe 385 and
through a pipe 395 and a throttle valve 396 into
the valve chamber 390'to move the pilot valve to 45
the right-hand position, as shown in Fig. 2. The
valve 396 serves to control the rate of admission
of ?uid to the valve chamber 390 and thereby
controls the rate of movement of the pilot valve.
During this movement of the pilot valve, ?uid 50
within the chamber 393 exhausts through a pipe ’
391, an adjustable throttle valve 398 and a pipe
3 I 5 which exhausts ?uid through the valve
chamber 66 and returns it through the pipe 69
to the reservoir 8|. The valves 396 and 398 serve 55
to control the rate of movement of the cycle pilot
valve.
When the main control valve 58 is reversed and
?uid under pressure is admitted to the pilot valve
chamber 393 to shift the pilot valve 318 toward
the left, ?uid under pressure passing throughthe
pipe 394 may enter the valve chamber 38I and
pass through the passage 380, the ball check valve
319, the passage 311, the pipe 316, into thecycle
timing piston and cylinder 368 to cause-the piston 65
361 to move toward the left, therebyrocking the
rock arm 364 to move the switch plunger 362 to
ward the right (Fig. 2) which in turn closes the
switch 368 so that the work spindles grip the
next work piece, thereby closing trip switches 336 70
and 345, which closes the circuit and serves to
energize the solenoid 15 ' to start the infeeding
movement of the grinding wheel. '
An adjustable stop screw 488 on the cycle tim
ing valve 368 serves to limit the movement of the 75
9
2,117,917
piston 361 toward the left and thereby permits
adjustment of the capacity of the cycle timing
piston» and cylinder so as to admit-the‘ desired
amount of ?uid to obtain the cycle of operation
desired.
,
"
t.
A push button MI is provided in theelectrical
circuit to stop and start the cycle of operation.
This switch MI is connected in series with the
normally closed trip switches 336; 345 and the
10 normally open trip switch 368.
,
The operation of this machine’ is‘freadily ap
rocked to remove the ?nished work piece I88 and
present an unground work piece I88a into align
ment with the work centers I11 and 2I4 before
the valve piston 388 covers the port to cut off
?uid from the pipe 391. When the pressure from
the pipe 391 is cut off and the pipe M9 is uncov
ered, the released compression of the springs I81
and 283, spring I19 in the work supporting head
H5, and a similar spring in the work head “8
serves rapidly to move the work spindles simul
taneously toward each other to engage the work
centers I11 and 2I4 - with the unground work
parent from the foregoing disclosure.‘ When it is a piece I88a. This movement serves rapidly to ex
desired to start the machine in operation, a con
haust ?uid from the cylinder chambers I89 and
trol button 482 on the front of the-machine base 2I2 in the cylinders I85 and 288. Any leakage of
15 is actuated to start'the wheel rotation, a push
?uid by the pistons I86 and 28I is exhausted by
button 483 is actuated to start the fluid pump, and an extension of the pipe 383 into the reservoir
'a push button 404 is actuated to-f start the work 6I. This movement of the spindles into an opera
drive motor I34. The push button 48I is then tive position serves to‘ close the trip switches 338
20
‘actuated to start the, cycle of operation. The
and 345. The trip switch 388 being already
20 switch MI is connected in series with the trip _'closed, thereby completes the circuit to energize
‘switches 336, 345, and 358, and serves to’ energize the solenoid 15 to shift the feed control valve 58,
‘ the solenoid 15 which‘ shifts the controljvalve 58 so as to move the grinding wheel 34 toward the
into the position shown in Fig. 2'to start ‘a forward work piece I88. At the same time pressure in the
feeding movement of the grinding wheel 34. As
pipe 385 passes through a passage 386 in a valve
25 suming a work piece‘ to be already located on the
381, through a vpipe 388, the valve 389 and the
work centers, ?uid under pressure entering the pipe 3I8, into a cylinder chamber 3I I, to move
valve chamber 65 passes into the pilot valve the work carrier 25I away from the work into
chamber 398 to shift the cycle timing valve 318 the position shown in Fig. 8. The radially extend
30
into the position illustrated‘in Fig. 2'. The grind
ing holes 328 are uncovered and at the same time
30 ing wheel 34 advances to grind the work I88 to
the holes 332 are uncovered and ?uid passes
the required size and the extent of the grinding through the passage 324 to the cylinder chamber
operation, that is infeed and'dwell, is determined 325 to rock the work carrier head 25I into the
by the adjustment of the cycle timing piston and
cylinder 368 which meters ?uid from the valve
chamber 315 through the variable throttle valve
385 into the exhaust. When the cycle timing pis
ton 361 has moved toward the right a sufficient
distance during ‘the grinding operation, the trip
switch 368 is opened, thereby breaking the circuit
48‘ and deenergizing the solenoid 15 which releases
the compression of the spring 82 and returns the
feed control valve 58 to its reverse position so
that ?uid under pressure is admitted through the
valve chamber 88 into the cylinder chamber 58 to
45 cause a rearward movement of the grinding wheel
34; The shifting of the feed control valve 58
admits ?uid under pressure through the pipe 3I5
and the pipe 391 into pilot valve chamber 393 to
start the cycle timing valve 318 moving toward
the left and at ' the same time passes ?uid
through the passage 3“ in valve 381 and through
the pipe 3|3 into the cylinder chamber 3I2 to
move the work carrying member 254 ‘forward
simultaneously to grip‘ a; new piece of work I88a
and the ground-piece_of work I88,
When ?uid is admitted through the pipe
391 '
_ ‘into the pilot valve chamber 393 to cause the tim
position illustrated ‘in Figs. 2 and 5. During the
downward movement of the cylinder 3I8, ?uid is
exhausted from the cylinder chamber 328 through
the pipe 4I8, a ball check valve in cylinder I85,
and through the pipe M4, the pipe M3, the valve
M2, the pipe M8 and the pipe 4I9.
During the period while the work gripping cen 40
ters are separated, a pipe M8 is uncovered by
movement of the piston I88 toward the left
(Fig. 2) which serves to admit ?uid under pres
sure through a; valve M1 and pipe or passage
321 into cylinder chamber 326 to move the cylin 45
der 3I8'upwardly, thereby rocking the work car
rier 25I in a clockwise direction to shift the
ground piece of work I88 into a. discharge posi
tion I88b and simultaneously to move a new piece
of work I88a into axial alignment with the work 50
gripping centers.
The arrangement above described is such that
the exhaust of ?uid from the cylinder chamber ,
328 through the valve 4“ is controlled in timed
relation with movement of the pistons I86 and 55
28I which actuate thework gripping and rotat
] ing spindles. This arrangement of parts serves
to delay applying of pressure of the, work car
wing, valve .318 to move toward the, left,;' ?uid is} v "'r against, the workduring- its movement to
rid'p'iéce‘of work to‘ they discharge
sh pre'c 'off'work into-axialéalign
'
60
It’also’ serves.‘ to ’ elimi
'- I'Hthé ‘ work *ca'rrying
v“thef‘vilithdra a‘l of
H
operation,“
‘ to tires e cylinderg ham
v
_
_
U
,
_
tantaneous'ly‘ while'thev
"
>
I
86
‘
alve"‘‘')4281 opened. which“ allows‘'- passage of c?uid
etween the cylinder ‘chamber5f'326*,1'thei ‘pipe 3 2 1
ian‘dvjthépas‘sage 328 in"the1work>carrierhorizontal
cylinder: ‘I This connection avoidsi-the delayed: ac
, "timing
5 3 . The speed
valve ‘m
oi‘movement
‘is beingmovedtawa'rd
ofthetimingthed‘e‘ft.
valve- 318* tion'iof the?‘ Work‘ carryingimember'ian'di‘tends to
' "speedup thev‘oper'ation of ‘the ‘carrier. x»:
'as' governed by the v'alves 396 and 398 i's'such as‘v ' " ' The valve ‘4I2 is\provided to facilitate inde
to‘ allow ‘time fo‘r'the work centers’ I11 and‘ 2 I4 to pendent movement of the work supporting cen
be disengagedan'd the‘ work carrier '25I'to be
70
1@
2,117,917
ters in setting up and adjusting the, machine ele
cal interlock including trip switches actuated by '
ments. During the normal operation of the ma
chine under control of the automatic cycle con
the longitudinal movement of the work support
ing spindles which are connected in series with
said solenoid and are arranged to prevent ener
gizing said solenoid until the work spindles are
in supporting engagement with the work piece.
4. An automatic cylindrical grinding machine
having a, transversely movable rotatable grind
trol mechanism, the valve H2 remains in the
position illustrated in Fig. 2. If it is desired man
ually to operate the pistons independent of the
cycle control mechanism, the valve “2 is shifted
in a clockwise position into the position illustrat
ed in dotted lines in Fig. 2 so that ?uid under
10 pressure from the pump 59 is admitted to the
cylinder chambers I89 and 212, respectively, to
withdraw the work supporting centers inde
pendently of the cycle control.
This cycle of operation is then continued on
15 successive pieces of work.
By manipulation of
the various control valves, the timing of the
movement of the various hydraulically actuated
parts may be regulated as desired to obtain-the
desired coordination~ in the movement of the
20 various parts of the machine.
_
It will thus be seen that there has been pro
vided by this invention apparatus in which‘ the
various objects hereinabove set forth together
with many thoroughly practical advantages are
As many possible em
bodiments may be made of the above invention
and as many changes might be made'in the
embodiment above set forth, it is to be understood
that all matter hereinbefore set forth »or shown
30 in the accompanying drawings is to be inter
25 successfully achieved.
preted as illustrative and not in a limiting sense.
I claim:-
1. An automatic cylindrical grinding machine
having a transversely movable rotatable grinding
35 wheel, a pair of opposed axially aligned work
supporting and rotating spindles, a work carrier
to convey work pieces successively to said spin
dles each of which is operated by a separate ?uid
motor, a main control valve in control of said
40 grinding wheel ?uid motor and said work carrier
?uid motor, a cycle timing valve controlled there
by, said cycle timing valve being in control of
said spindle ?uid motor, and a cycle timing pis
ton and cylinder to control the cycle of operation.
2. An automatic cylindrical grinding machine
45
having a transversely movable rotatable grind
ing wheel, a pair of opposed axially aligned work
supporting and rotating spindles, a work carrier
to convey work pieces to said spindles each of
50 which is operated by a separate ?uid motor, a
main control valve in control of said grinding
wheel and work carrier ?uid motors, electrically
operated means to actuate said valve- to cause
an infeeding movement of ‘ the grinding wheel,
a cycle timing valve controlled by said valve, said
cycle timing valve being in control of said spindle
?uid motors, a cycle timing piston and cylinder
to control the grinding cycle, and an electric
switch actuated by said cycle timing cylinder to
60 operate said electrical means to shift the main
control valve and thereby cause a rearward sep
ing wheel, a pair of opposed axially aligned work
supporting and rotating spindles, a work carrier 10
to convey work pieces to said spindles each 01'
which is operated by, a separate ?uid motor, a
main control valve in control of said‘ grinding
wheel, an electric solenoid to actuate said valve
to cause an infeeding movement of the grinding 15
wheel, a ‘cycle timing valve controlled by said
valve, said cycle timing valve being in control
of said spindle ?uid motors, a cycle timing piston
and cylinder to control the grinding cycle, and
an electrical switch actuated by said cycle tim
ing piston and cylinder 'to actuate said solenoid
to shift the main control valve and thereby cause
a rearward separating movement of the grinding
wheel.
5. An automatic cylindrical grinding 'machine 25
having a transversely movable rotatable grinding
wheel, a pair of opposed axially aligned work sup
porting and rotating spindles, means synchro
nously to rotate said spindles, means to rotate
said grinding wheel, means to move said spindles
toward and from each other to grip a work piece
therebetween,- a grinding wheel feeding mech
anism, means including a solenoid to initiate an
infeeding movement of the grinding wheel, and
an electrical interlock including trip switches 35
actuated by the longitudinal movement of the
work supporting spindles, said trip switches be
ing connected in series with the solenoid so as to
prevent actuation of the solenoid when ‘the
spindles are separated.
40
6. An automatic cylindrical grinding machine
having a transversely movable rotatable grinding
wheel, a pair of opposed axially aligned work
supporting and rotating spindles, a work carrier
to convey work pieces to said spindles each of
which is operated by a separate ?uid motor, a
main control valve in controlof said grinding
wheel and work carrier ?uid motors, an electric
solenoid to move, said valve in one direction to
cause an infeeding movement of the grinding 50
wheel, a cycle timing valve controlled by said
valve, said cycle timing valve being in control
of said spindle ?uid motors, a trip switch associ
ated with said spindles and arranged to be actu
ated when said spindles are separated, a cycle
timing piston and cylinder to control the grind
ing cycle, an electric switch actuated by said cycle
timing piston and cylinder,'and electrical con
nections between said trip switches, said elec
trically operated‘ switch and solenoid, whereby 60
the solenoid is ‘rendered inoperative when th
arating movement of the grinding wheel.
spindles are separated.
'
3. An automatic cylindrical grinding machine
'7. An automatic'cylindrical grinding machine
having a transversely movable rotatable grinding ' having a transversely movable rotatable grinding
wheel, a pair of opposed axiallyaligned work wheel, a pair of opposed axially aligned work
supporting and rotating spindles, means syn
supporting and rotating spindles, a work carrier
ehronously to rotate said spindles, means to ro
to convey work pieces to said spindles each of
tate said grinding wheel, means to move said
spindles simultaneously toward and from each
70 other to grip or release a work piece therebetween,
v75
a wheel feeding mechanism arranged to feed the
grinding wheel either toward or from the work,
means including an electric solenoid to actuate
said feeding mechanism to initiate an infeeding
movement of the grinding wheel, and an electri
which is operated by a separate ?uid motor, a
main control valve in control of said grinding
wheel and work carrier ?uid motors, an electric
solenoid to actuate said valve to cause an infeed
ing movement of the grinding wheel, a cycle
timing valve controlled by said valve, said cycle
timing valve being in control of said spindle ?uid
motors. a cycle timing piston and cylinder opera
11
- 2,117,017
tively connected with said valves and arranged to
control the grinding cycle, an electric switch as
sociated with each of said_spindles, connections
between said switches and spindles whereby the
switches are actuated when the spindles are sep
arated, and electrical connections connectingthe
trip switches and solenoid'in series so as to pre
vent actuation of the main control‘valve while
the spindles are separated.
- 8. An ‘automatic cylindrical grinding machine
having a transversely movable rotatable grinding
wheel, a pair of opposed axially aligned work sup
porting and rotating spindles, a work carrier to
convey work pieces to said spindles each of which
is operated by a separate ?uid motor, a main
control valve in control of said grinding wheel
and work carrier ?uid motors, an electric sole
noid to actuate said valve to cause an infeeding
movement of the grinding wheel, a cycle timing
valve controlled by said valve, said cycle timing
valve being in control of said spindle ?uid motors,
a cycle timing piston and cylinder operatively
connected with said valves and arranged to con
trol the grinding cycle, an electric switch associ
25 ated with said spindles, connections between said
switch and spindles whereby the switch is actu
ated when the spindles are separated, an electric
switch which is actuated by said spindles, an elec
tric switch actuated by said cycle timing piston
30 and cylinder, and electrical connections connect
ing said ‘switches and solenoid in series with each
other so as to prevent shifting of the main con
trol valve and an infeeding movement of the
grinding wheel when the work spindles are sepa
35 rated.
and to convey the new work piece into axial
alignment with the work spindles, and a main
control valve operatively connected to control the
admission of ?uid to the grinding wheel cylinder,
the work spindle cylinders and the work carrier Cl
cylinders so that the various elements are moved
in timed relation with each other.
11. An automatic grinding machine compris
ing a transversely movable rotatable grinding
wheel, means including a piston and cylinder to 10
move said wheel transversely, a pair of opposed
aligned rotatable ~work supporting spindles,
means including an electric motor synchronously
to rotate said spindles, a ?uid pressure piston
and cylinder operatively connected to move each
of said spindles, a work receiving hopper, a dis-_
charge chute, a pivotally mounted transversely
movable work carrier having two work receiv
ing pockets thereon, means including a piston
and cylinder to move said carrier transversely 20
simultaneously to grip a new piece of work and
a ground piece of work supported on said spin
dles, means including a ?uid pressure piston and
cylinder to rock said carrier simultaneously to
convey the ground work piece to the discharge
chute and to convey the new work piece into
axial alignment with the work spindles, and con
nections between said spindle cylinders and said
work carrier cylinders whereby the rocking of
the work carrier is interlocked withthe work 30
spindles so that the carrier is held against rock
ing movement while the spindles are separated.
12. In an automatic cylindrical grinding. ma
chine, a work loading device having a pivotally
mounted transversely movable work carrier head 35
thereon, a pair of spaced work receiving pockets
9. An automatic cylindrical grindingv machine on said head, means including a ?uid pressure
having a transversely’movable rotatable grinding - operated piston and cylinder to move said head
wheel, a piston and cylinder to move said wheel transversely into an operating position, and
in either direction, a pair of opposed aligned ro
tatable work supporting spindles, means syn
40
chronously to rotate said spindles, means includ
ing a ?uid pressure piston and cylinder opera
tively connected to each of said spindles and ar
ranged to move- the same toward and from each
other to grip a work piece therebetween, a. piv
otally mounted transversely movable work car
rier, a hopper associated therewith, a ?uid pres
sure piston and cylinder to movev said carrier
transversely, a ?uid pressure piston and cylinder
operatively connected to rock said carrier, a main
means including a ?uid pressure piston and cyl
40
inder operatively connected thereafter to rock
said work carrier head into a second operating
position.
.
' 13. In an automatic cylindrical grinding ma
chine, a work loading device having a pivotally
mounted, transversely movable work carrier
head, a pair of spaced work receiving pockets
on said head, means including a piston and
cylinder'to move said head transversely into an
operating position, means including 7 a second 50
piston and cylinder to rock said head into a sec
50 control valve operatively connected to control
ond operating position, and ?uid pressure means I
the admission of ?uid to said wheel feed cylin- - including a control valve mechanism “operatively
der and said work carrier cylinders, and a cycle
timing valve operatively connected with said
main control valve and arranged to control the
admission and exhaust of ?uid from said work
connected to said cylinder so as to ?rst cause a
transverse movement of said head, then a rock
ing movement of said head, then a transverse
movement of said head in the reverse direction,
spindle cylinders.
’
'
10. An automatic grinding machine compris-, and a rocking movement of said head in the op
ing a‘ transversely movable rotatable grinding posite direction.
' 14. In an automatic cylindrical grinding ma
wheel, means including a piston and cylinder to
move said‘ wheel transversely, a pair of opposed chine having a pair of opposed axially aligned‘
aligned rotatable work supporting spindles, work supporting and rotating spindles, a work
means including an electric motor synchronously hopper, a work loading device comprising a piv
.to rotate said spindles, a fluid pressure piston and otally mounted transversely movable work head
thereon having a pair of spaced work receiving 65
pockets simultaneously to grip an unground and
charge chute, a pivotally mounted transversely a ground work ‘piece, a discharge chute, means
movable work carrier having two work receiving including a-piston and cylinder to move said head
pockets thereon, means including a piston and transversely simultaneously to grip an unground
70
cylinder to move said carrier transversely simul
70 taneously to grip a new piece of work and a work piece supported in said hopper and a
ground work piece supported on said spindles,
ground piece of work supported on said spindles, and means including apiston and cylinder to
means including a ?uid pressure piston andcyl
rock said head so as to shift the unground work
inder to rock said carrier simultaneously to con
piece into alignment with said spindles and to 75
vey the ground work piece to the discharge chute
75
65 cylinder operatively connected to move each of
said spindles, a work receiving hopper, a dis
12
2,117,917
shift the ground work piece into said discharge
chute.
'
'
15. In an automatic cylindrical grinding ma
chine having a pair of opposed axially aligned
work supporting and rotating spindles, means
including a ?uid pressure piston and cylinder
operatively connected to move said spindles to
ward and from each other, a work hopper,
a work loading mechanism comprising a pivotal
10 ly mounted transversely movable work carrier
head, a pair of spaced work receiving pockets
on said head, means including a piston and cyl~
inder to move said head transversely simultane
ously to grip a new work piece supported in said
hopper and a ground piece of work supported
on said spindles, means including a piston and
cylinder to rock said head so as to discharge the
ground piece of work and to present a new piece
of vwork into axial alignment with the work sup
20 porting spindles, and a hydraulic interlock be
tween said spindle actuating cylinders and said
work carrier rocking cylinder whereby said latter
cylinder is rendered inoperative until the work
spindles have separated to release a ground piece
25
of work.
_
16. In an automatic cylindrical grinding ma
chine having a pair of opposed aligned work sup
porting and rotating‘ spindles, a ?uid pressure
piston and cylinder operatively connected to each
30 of said spindles and arrangedto cause them to
approach or recede from each other, means syn
chronously to rotate said spindles, a work hopper,
a discharge chute, a work loading device compris
ing a pivotally mounted transversely movable
35 work carrier head thereon, a pair of spaced work
receiving pockets on said head, means including
a piston and cylinder to move said head trans
versely simultaneously to grip a work piece sup
ported in said hopper and a ground piece of work
supported on said spindles, means including a‘
'piston and cylinder ‘to rock said head so as to
simultaneously transfer said work pieces, and
fluid pressure connections between one of said
spindle cylinders and said work head rocking
cylinder whereby said rocking cylinder is ren
dered inoperative until said work spindles have
moved to an inoperative position.
'
'
10
17. In an automatic cylindrical grinding ma
chine, a pair ‘of opposed axially aligned work
supporting and rotating spindles, means syn
chronously to rotate said spindles, means includ
ing a piston and cylinder to move each of said
spindles toward and from each other, a work
hopper, a discharge chute, a work loading device
including a pivotally mounted transversely mov
able work carrier head, means including a piston
and cylinder‘ to rock said head so as to shift the 20
work pieces simultaneously into alignment with
said spindles andsaid discharge chute respective
ly, a main control valve to admit ?uid to said
?rst cylinder to move said work carrier head
transversely, a cycle timing valve‘actuated by 25
said main control valve, connections between
said cycle timing valve and said spindle actuating
cylinders to control the movement of said spin
dles in timed relation with the movement of said
work head, and ?uid pressure connections be 30
tween one of said spindle cylinders and said work
head rocking cylinder which are arranged to
render said work head rocking cylinder‘ inoper
ative until the work spindles have'separated and
moved to an inoperative position.
35
HERBERT A. SILVEN.
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