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Патент USA US2105841

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Jan. 18, 1938.
-
2,105,841
' c. L. OTT ET'AL
AUTOMATIC LINE BEARING GRINDER
Filed July 28, 1932
18 Sheets-Sheet 1
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AUTOMAT I C L INE BEAR ING GR lNDER
Filed July 28, 1932
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AUTOMATIC LINE BEARING ‘GRINDER
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AUTOMATIC LINE BEARING GRINDER
Filed July 28, 1932'
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AUTOMATIC LINE BEARING GRINDER
Filed July 28, 1932
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Patented Jan. 18, 1938' ‘
' 2,105,841
PATENT YOFF‘ICEF
UNITED STATES
I
2,105,841
AUTOMATIC LINE BEARING GRINDER
.C’onrad L. Ott and Harold E. Balsiger, Waynes
boro, Pa., a'ssignors to Landis Tool Company,
Waynesboro, Pa., a corporation of Pennsyl
vania
Application July 28, 1932, Serial No. 625,386
'
57 Claims. (Cl. 51-72)
..
Figure 10, a side elevation of the center back
This invention relates to grinding machines and‘
is designed particularly with a view to its use in
rest,
_
Figure 11, a plan view of the center back
rest with parts shown in section,,
grinding successively each of'several bearings on
a'cam shaft, and one of the principal objects is
5 to provide a grinding machine having means for
eifecting a cycle of operations each of which
operations is controlled by a sizing device.
A general object of the machine is to provide
Figure 12, a. side elevation of a control valve 5
for operating the back rests and the sizing devices,
Figure 13, a section on line l3-,-I3 of Figure 12,
Figure 14, a longitudinal section of the control
valve taken on line l4—l4 of Figure 12,
Figure 15, a section on line 15-15 of Figure 14, 10
a grinding machine in which the bearings on the
10 shaft may be ground and sized and the work car
Figure 16, an end view of the control valve
showing dogs for operating the star wheel on the
riage moved past the grinding wheel to position
new bearings before the wheel and to move the
wheel to grinding position and in which all of
the several movements of the machine are auto
' valve.
~
Figure 17 is a view in elevation showing the .
operating dogs on the bed of the machine and 15
'
I
A still further object is to provide wheel feed 7 their relation to star wheel operating devices for
matically controlled.v
means in which the slow feed of the wheel base
toward the work may be regulated in accordance
with the amount of stock to be removed from
20 the respective bearing.
'
A still further object is to provide a hydraulic
control system for operating the several devices
on the machine and which is itself controlled by
a sizing device in response to reduction in the
25
size of the work.
_ _
Further objects are to’ provide new and im
proved head and tail stocks, new and improved
the valve which controls the back-rest and the
sizing
_
devices,
'
'
'
Figure 18, a section on line l8-l8 of Figure 14,
\
Figures 18a, 18b and 180 are diagrammatic 20
views looking from the rear'of the machine and
showing the positions of the control‘ valve when
grinding the center bearing and the right and left
bearings respectively.
,
-
Figure 19 is a front elevation of means for 25
changing from high speed to feeding-in speed of
the vgrinding in accordance with the size of the‘
’
wheel feed mechanism, new and improved back _ bearing being ground,
Figure 20, a right end view on Figure 19,
rests and work supports, and new and improvedv
work sizing devices.
I
.
Figure 21, a side elevation of a portion 'of the 30
-
gear connection for operating means'?for chang
Further general objects and advantages will be
, come apparent from the description which fol- - ing from fast to slow feeding-in of the wheel base,
I Figure 22, a horizontal section on line 22—22 of
lows.
‘
'
Referring to the accompanying drawings. which
are made a part hereof and on which similar
reference characters indicate similar parts,
_
Figure 1 is a front elevation of a grinding ma
chine constructed according to myIinvention’,’
Figure 2, a longitudinal section of a tail stock
40 for supporting one end of the work,
Figure 21, with the-feed motor removed so as to
show in full lines the gear carrying the’control
pins
Figure 24, a side elevation~pf a portion of the
wheel feerf device,
-
Figure 3, an end elevation of the tail stock
looking from the right in Figure 2, I
Figure
I Figure
21,23, a vertical section on' line '23—23 of 35
-
Figure 4, a longitudinal section of .aiportion of
,
a
40
Figure 25, a front elevation as seen from the
left in Figure 24,
Figure26, a plan view of Figure 25,
I I Figure 27, a front elevation of the main control
the inner end of the head-stock,
45
,
Figure 5, a longitudinal section of a portion of valve assembly,
Figure
28,
a
diagrammatic
view
ofthe
hydraulic
the outer end of the head-stock,
'
».
Flgure?, a face view of the head-stock looking ' control ?uid lines, and
Figure 29, a diagrammatic view of the oil cir
from the right along line 6-6 of Figure 4, ’
Figure '7, a section on line 'l-‘I of Figure 4, ‘ cuits and the control line,
Figure 30 is a diagrammatically enlarged view 50
Figure 8, a plan view of one of the end back.-'
5O
rests showing a part of a sizing device in section of the contacts and some of the electric circuits.
In the drawings numeral 30 indicates the bed
and a part of a cushioning device forthe back
of a grinding machine having a work carriage 3|
rest in longitudinal section,
Figure 9, a longitudinal section on line .9-—9 of mounted thereon for reciprocation transversely
.55 Figure 8,
of a grinding wheel 32 mounted on a wheel base 55
.2".
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. 2,105,841
31. The work carriage has mounted thereon a escape through a port ‘II which is drilled through
tail-stock 33 and a head-stock 34. The head
the housing or cylinder‘6'l. A packing ring ‘I2
stock is driven by means of an electric motor 35 ' is provided for expanding packing elements '13.
through suitable driving means enclosed in a A gland ‘I4 is‘ urged inwardly to compress the
housing 36. The driving connection may be and. packing by means of a ring ‘I5 which is screw
preferably is a belt or chain. The grinding wheel‘
threaded» within the bore in the head element 6.5.
' is'inounted on a. wheel base 31 and. is moved
The head element 65 and the housing .66 with
toward and from the work by members which will their
associated and connected parts are mount
be later described. The grinding wheel is driven
10 by means of an electric motor 38 mounted on the ed on the stationary element 54 and are rotated
by means of a sprocket wheel ‘I6. A work driv 10
wheel base 31.
'
'
7
Head and tail-stocks
The tail-stock 33 comprises a cylindrical hous
The
inner end of the piston 39 is chambered to receive
16 ing having a piston 39 operable therein.
1 a tapered work engaging center 40.
A cup 4| is
secured to the end of the piston 39 and engages
over the cylindrical end of the tail stock to pre
20 vent dirt or other injurious substances from
entering into the cylinder in which the piston
operates. The piston 39 is provided with a screw
threaded plug 42 into which the threaded endof
a shaft 43 engages, the plug 42 being secured in
26 the piston by means of a screw 44. The outer end
01' the shaft 43 is screw threaded‘to receive a nut
. 45 for locking the shaft 43 in position‘.
The pur
pose of the shaft is to eject the work center 40.
A compression spring 46 surrounds‘the shaft 43
and engages the plug 42 at one end and engages
the inner end of a cover plate or plug 41 at its
other end, the spring tendingto urge the piston
39 carrying the centering pin 40 toward the work.
Packing glands 48 are provided about the piston
39 to prevent leakage of ?uid from a chamber 49.
A pressure'?uid line 50 is connected to the cham
ber 49 for supplying ?uid under pressure for with
drawing the tail-stock out of engagement with
the work..- A chamber 5! at the right of the
v40 piston 39 is provided with a drain connection 52
45
ing arm ‘I’! is mounted ,on a shaft ‘I8 which is
carried in the element 65. An arm ‘I9 is secured
to the inner end of the shaft 78 and this arm
engages in a notch or slot 80 in the outer end of
the piston rod 8| which is attached to the piston 16
68. The arm ‘I1 has a dog 82 which engages the
key slot or notch in the end of the work-piece
56. For the present purposes of description the
work-piece may be regarded as a cam shaft, the
bearings of which are to be ground.‘ The work 20
engaging arm 11 is moved to work engaging po
‘sition by means of the spring ‘I0 and is moved
from work engaging position by pressure ?uid
applied through the ports 64, ‘I0 and 69.
Back-rests and work supports
In grinding the bearings on a cam shaft it is
necessary to support the shaft opposite the grind
ing wheel at all times and it is advisable also to
have the shaft supported intermediate its ends at 80
all times. In order to do this we have provided
back-rests 83 which support the end bearings and
a slightly different form of back-rest 84 for sup~
porting the shaft intermediate its ends. Both of
the end back-rests are alike. It is necessary 35
therefore to describe only one. This b ck-o‘est
consists of a body portion in which is a c linder.
in which operates a piston 85. It may be advis
able, to provide a lining 86 in the cylinder in which
the piston. 85 operates. The/piston 85 is urged 40
toward the work by ?uid under pressure supplied '
for conducting any ?uid which may leak past the'
piston back to a suitable reservoir ‘in the bed of
the machine. The tail-stock assembly is secured - through pipe connection to port 88. The piston
.
upon the work carriage by means of a bolt the is retracted by a spring 87.
The forward end of the piston rod 89 carries
head of which is at‘ 53. In operation the work
center 40 remains stationary, the work being ro . work engaging shoes 90. which engage the work 45
and support it opposite the thrust of the grind
tated relative to the pin.
ing wheel. The work is supported in two or more
The head-stock 34 comprises a stationary ele
ment 54 which is chambered to receivepentering saddles ‘9| which are secured upon the work rest
by means of bolts 92. Movement of the back
50 pin 55 having a pointed end engaging the depres
sion in the end of the work 56. A shaft 51 has a
screw threaded end engaging in the inner end of‘
the work center 55. The outer end of the shaft
51 has a'n'axial bore 58 terminating in radial
bores 59 which communicate with a chamber 60
surrounding the shaft 51. The bore 58 is con
nected to a pressure ?uid line which supplies
?uid for operating work driving mechanism later’
to be described.
60
The work centering'pin 55-is provided with
longitudinal grooves 6I which terminate in an
annular groove .62. The annular groove com-'
municates with a plurality of radial passages 63
which passages in turn communicate with pas
65 sage 64 in a head portion 65. The head portion
65 is secured in any suitable way to a housing
66 in which is provided a cylinder 61 in. which
cylinder operates a piston 68. The cylinder 61
is provided with a port 69 through which pressure
70 ?uid is admitted from the passage 64 to the
chamber at the front of the piston 68. A com
pression spring 10 is positioned against the inner
end of the piston 68 and operates against the
75
pressure ?uid applied through the .port 69. Any
leakage of pressure ?uid past the piston 68 may
rest member toward the work is cushioned and
controlled by hydraulic meanswhich ‘consist of a
cylinder 93 having a piston 94 operable therein.
A spring 95 is seated between the end of the pis
ton and the~inner end of the cylinderv 93.
A -
plunger 96 is slidable through a plug 91 which is 65
screw-threaded into the head 98 of the cylinder.
The outer end of the plunger 96 carries an ad
justable nut 99 which engages the outer end of a
lever ‘I00 which lever is pivoted at IN to the
backrest casing. The inner end of the lever I 00
extends into a slot I02 in ‘the piston rod 89. A
spring I03 attached to the end of the lever I00
at one end and attached in the cover 98 at its
other end tends to rock the lever I00 in ace/un
terclockwise direction to hold it against the end 65
of the plunger 96. A ?uid reservoir I04 is mount
ed on the back rest casing and communicates
through ports I05 and, I06 with the chamber at
the rear of the piston 94. The ports are pro
vided with" suitable check valves not shown and 70
restricted passages controlled by needle valves
I01 to permit ?uid to flow freely from the reser
voir into the chamber at the rear of piston 94
but to restrict the ?ow of ?uid out of the cham
ber at the rear of piston 94. The piston 84 and 76
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