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Патент USA US2411456

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Nov. 19, 1946,
'
A. H. ORCUTT
2,411,456
MACHINE FOR GRINDING THE TEETH OF GEAR WHEELS _
Filed May 10‘, 1945
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Nov. 19, I946. '
A, HORCUTT‘
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MACHINE FOR GRINDING THE TEETH OF GEAR WHEELS
Filed May 10, 1945
8 Sheets-Sheet 2
Nov. 19, 1946.
MACHINE FOR
A. H. ORCUTT
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2,411,456
GRINDING THE TEE'fH 0F GEAR WHEELS
Filed May 10, 1945
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A. H. oRcufr'r
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MACHINE FOR GRINDING THE TEETH OF GEAR WHEELS
Filed May 10, _l945
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8 Sheets-Sheet 4
Nov. 19, 1946.
A. H. ORCUTT
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MACHINE FOR GRINDING THE TEETH OF GEAR WHEELS
Filed May 10, 1945
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Nov, 19, 1946.
H. ORCUTT
MACHINE FOR GRINDING THE TEETH OF GEAR WHEELS
Filed May 10, 1945
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8 Sheets-Sheet 6
Nov. 19, 1946.
AT H, ORCUTT
2,411,456
MACHINE FOR GRINDING THE TEETH OF GEAR WHEELS
Filed May 10, 1945
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8 Sheets-Sheet 7
Nov. 19, 1946.
A, H, ORCUTT
2,41 1,456
MACHINE FOR GRINDING THE TEETH 0F GEAR WHEELS
Filed May 10, 1945
8 Sheets-Sheet 8
2,411,455
Patented Nov. 19, 1946
UNITED STATES PATENT OFFICE
2,411,456
MACHINE FOR GRINDING THE TEETH OF
GEAR WHEELS
Arthur Hitchcock Orcutt, Shirley, near Birming
ham, England, assignor to The Gear Grinding
Company Limited, Shirley, near Birmingham,
England
Application May 10, 1345, Serial No. 593,078
In Great Britain May 5, 1944
12 Claims._
1
This invention relates to machines for grind
ing the teeth of gear wheels, of the kind in which
a formed grinding wheel is reciprocated between
the tooth surfaces, and the toothed wheel is in
2
adjacent ?anks of a pair of wheel teeth. Asso
ciated with the headstock d is arranged a spindle
e which carries the toothed wheel to be ground,
the latter being herein referred to as the work
termittently rotated to bring successive tooth
piece. ‘ The spindle e is carriedby a slide which
a headstock, a side movable vertically in the
referred to again hereafter. Also on the bed of
the machine is' arranged a known form of
is movable vertically between guides in the head
faces under the action of the grinding wheel, the
stock. This movement can be e?ected manually
latter being trimmed periodically to maintain its
by a hand operable member f engaging a screw g.
form, The object of the present invention is to
Intermittent angular movements are given to the,
enable the feed movements of the workpiece rela
tively to the grinding wheel, and also the deter 10 spindle e to bring successive tooth spaces oppo
site the grinding wheel, and these movements
mining of the wheel trimming periods, to be ef~
are imparted by a known mechanism which in
fected automatically.
cludes a peripherally notched index plate to be
The invention comprises the combination with
headstock, a workspindle carried by the slide,
a manually operable‘ screw for moving the slide
in the headstock, and an index-plate carried by
the work spindle of an intermittently operable
feeding mechanism for imparting feed movements
to the slide independently of the said screw, 20
means consisting in part of an electromagnet for
actuating the feeding mechanism, and means re
sponsive to rotational movements of the work
trimming mechanism for periodically truing the
operative parts of the grinding wheel, this mech
anism being indicated generally by It in Figure
1. The mechanism forming the subject of the
present invention is arranged for the greater part
in association with the headstock d.
Referring now to Figures 3 and 4 which illus
trate the headstock d more fully, the work spin
dle e is carried as already stated by a slide 2'
spindle for controlling the said electromagne-t.
movable
between guides 70 in the headstock, and
25
The invention also comprises the combination
at the rear end of the spindle e is secured the
with the feeding mechanism, of electrical con
peripherally notched index plate I. This plate
tact devices for determining the grinding wheel
is given intermittent angular movements by a
trimming periods.
known mechanism which forms no part of the
In the accompanying sheets of explanatory
30 present invention and which has been omitted
drawings
from the drawings to vavoid undue complication.
Figures 1 and 2 are respectively side and end
elevations of a known form of gear wheel grind
ing machine having the invention applied thereto.
Figure 3 is a sectional side elevation and Fig—
ure 4 a sectional end elevation of a mechanism ‘
embodying the invention.
Figure 5 is a plan illustrating the mechanism
The source of motion of this plate is a shaft
m (Figure 1) which serves to actuate a pawl en
gaging the notches of the index plate, the pawl
being located in the housing it (Figure 2) _
rdi
narily the feed screw g is directly connected at
one end to the slide 1', but for the purpose of my
inventionit is attached to a connecting piece
with portions broken away to disclose certain
0 which'in turn is connected by a link 10 to a
of the electrical contact devices.
Figure 6 is a plan illustrating the mechanism 40 forked'crank arm q. The link is pivotally at
tached at its ends to the piece 0 and the crank
for imparting feed movements to the work piece.
arm respectively. The crank arm is pivotally at
Figures 7 and 8 are respectively sectional side
tached to the slide 1' in the manner clearly shown »
elevations in planes at right angles to each other
in-Figure 4, and the pivot axis of the crank arm
of the mechanisms shown in plan at Figures 5
45 is eccentric to the adjacent pivot axis of the
and 6.
»
connection between the link 10 and the crank arm
Figures 9 and 10 are detail views of certain
q as is also clearly shown in Figure 4. The ar
elements to be referred to hereafter.
,
rangement is such that the slide can be raised
To facilitate explanation of the invention, a
and lowered to any desired position by manual
brief description will first be given of the ma
chine illustrated by Figures 1 and 2, the larger 50 operation through the medium of member 1‘ and
the screw 9. The member .1‘ is carried on the
part of this machine being already known. On
headstock and consists in part of a nut engaging
the bed a is arranged a slide 1) which is adapted
the screw. But the feed movements are-hue
to be reciprocated horizontally on the bed a. The
parted to the slide by the crank} arm independ
slide carries a rotary grinding Wheel c-the pe
riphery of which is shaped to conform with the 55 ently of the screw through a range which is de
3
2,411,456
termined by the eccentricity of the two pivot axes
above mentioned and which is made su?icient to
allow the work piece to be fed relatively to the
grinding wheel by the amount corresponding to
the amount of material to be removed from the
work piece by the grinding wheel. The actuation
of the crank arm is effected automatically in the
manner which will now be described with par
4
plete rotation of the index plate until the grind
ing operation has been completed.
The angular movement given to disc y in each '
action is constant, but the feed movement given
to the slide 2' progressively diminishes as the
crank arm q approaches the central or vertical
position, Consequently at the commencement of
a grinding operation on the work piece the feed
movements are relatively coarse, and they be
Alongside the headstock is mounted a housing 10 come progressively ?ner towards the completion
1" herein referred to as the control box. In the
of the grinding operation. The’ total step-by
control box is mounted a spindle s which at its
step movement required to be given to the disc
upper end has secured to it a dial t operable by
3/ for moving the crank arm q throughout its
a handle 6 (Figures 1, 2 and 4)’ enabling the
range of movement (which corresponds to the
spindle s to be actuated by hand when required,
total feed movement to be given to the slide 2' for
and on the housing is secured a pointer u (Fig
a given work piece) is usually a little less than
ures 1 and 2) for assisting the user to set the dial
one revolution.
'
to any desired position. On the spindle sis se
During the grinding operation it is necessary
cured a pinion 22 which engages a slidable rack in
to trim the grinding wheel at appropriate inter
one end of which is pivotally connected by a 20 vals, and to enable these periods to be determined
link :0 to the crank arm q (Figure 3), enabling
automatically. we provide on the dial 1? of the
feed motions to be imparted to the crank arm
control box, a series of suitably placed and ex
ticular reference to Figures 3, 4, 6, 7, and 8.
and thence to the workpiece, either by hand or
automatically. To e?ect automatic actuation
there is also secured to the spindle s a peripheral
ly notched disc y (see Figure 6) and in association
with this disc there is pivotally mounted in the
control box an arm 2 which carries a pivoted pawl
3 loaded by a tension spring 4 which tends to hold
one end of the pawl in engagement with the disc '
y. In addition there is pivoted in the control box
a retaining pawl 5 which is loaded by a blade
spring 'i, the purpose of this pawl being to pre
vent reverse rotation of the notched disc. Toen
able both pawls to be put out of action when it
is desired to be able to rotate the disc by hand in
either direction, a rotatable cam 8 (Figure 6) is
arranged in the control box in association with a
pair of adjacent ends of the two pawls, this cam
being rotatable by a handle 9 (Figure 5). Auto
matic actuation of the arm 2 is effected in one di
rection by a solenoid H3 and in the other direc
tion by a spring Ii, The arm is connected to the
movable core of the solenoid by a link 12, and
this link is also connected to a tube E3 which can
slide on a ?xed guide bar M, the spring H being
located within this tube as shown in Figure 6.
The solenoid serves to effect retractive idle move
ments of the arm 2 and pawl 3 relatively to the
notched disc y, and the spring it serves to im- ;
part the required feed movements to the disc y
through the said arm and pawl. An adjustable
stop l5 carried by the control box serves to limit
the operative movements of the arm.
The control of the supply of electric current i
from any convenient source to the solenoid is ef
fected by the index plate I. On this plate is se
cured a striker it, which at the end of each com
plete rotation of the index plate, engages a lever‘
I1 (Figures? and 9) and by lifting this lever
causes it to raise a plunger l3 which lifts a mova
ble contact piece EQinto contact with a pair of
resilient contacts 20 which may be loaded by
springs 2! (Figure 9), so closing the solenoid
circuit. The effect of this is to bring the solenoid
It into action, causing the arm 2 and pawl 3 ‘to be
retracted against the action of the spring I I, and»
to hold the said parts in their retracted position.
When the index plate I begins its next rotation
the striker I6 leaves the lever I’! and allows the
contact pieces to resume their initial positions,
thereby causing the solenoid circuit to be re
opened. Whereupon the spring ll imparts a
feed movement to the work piece, the above de
scribed action being repeated after each com
ternally projecting radial striking pieces 23 (Fig
ures 5 and ‘7). These are not equally spaced, but
are so disposed that the time intervals between
successive trimming actions are longer during
the initial stages of the grinding operation when
what may be termed coarse grinding occurs, than
in the later stages when the ?ne or ?nishing
grinding occurs. vThe striking pieces 23 are
brought into action successively during the ro~
tation of the dial t by the spindle s to‘which is
secured the notched disc y above described. The
particular machine to ‘which the invention is
shown applied is ordinarily ?tted with a mech
anism controlled by a hand lever 24 (Figure 1)
by which the grinding action can be temporarily
arrested. The slide b is caused to be retracted so
as to bring the grinding'wheel c to the trimming
mechanism h by a further lever (not shown). In
association with this mechanism we arrange any
convenient electromagnetic means such as a sole
noid (not shown) which when excited serves to
perform the same function as the said levers, and
this solenoid is arranged in a circuit which is '
controlled by a switch operable'by the strikers
23. The switch (see Figure 5) comprises a pair
of contacts 25, 26 and a pivoted contact member
'2? loaded by a spring 28 which tends to hold the
part 27 on the contact ‘25'. The contact member
21 is movable in opposition to the spring on to the
contact 26 through a plunger 29 by any one of
the strikers 23. The contact 25 is in series with
the circuit containing the feed solenoid in above
described, and the contact 26 is in the circuit of
the solenoid above mentioned associated with the
controlling means of the trimming mechanism.
When any of the strikers 23 reaches the plunger
29 it causes the latter to move the member 21 so
as to open the circuit of thesolenoid It! (and
thereby put the feed mechanism out of action)
and close the circuit of the other solenoid through
the contact 26. This latter solenoid now per
forms the function ordinarily effected 'byLone. of
the above mentioned levers and the slide biis
caused to move to the wheel trimming position.
The trimming operation is then performed in
the usual manner either under. the control of the
attendant or automatically, and on completion
’ of ‘
this operation the attendant restarts the‘rnachine ,
in the usual manner by actuationcf the usual,
means such as a push button switch on the con
trol panel 3d. But it is also necessary at the same
time to bring the feed solenoid into action again
by restoring the switch (25.- 26.- 21) to its initial
2,411,456
5
-
condition. To enable this to be effected, I mount
the plunger 29 on a pivoted arm 3| (Figures 5
and 10) loaded by a spring 32, and the arm 3|
Patent is:
slide 1). When the slide returns in the usual,
manner to the working position after the'wheel
has been trimmed the tappet 38 knocks the switch
31 over from one of its limit positions to the
other, and during this movement the circuit of
the solenoid 35 is momentarily closed causing the
solenoid core to pull the arm 3! to the left (Fig
ures 5 and 10) and so carry the plunger 29 away
from the striker with which it was previously in
contact. The part 21 now returns under the
action of its spring to the contact 23 and so re
establishes the circuit of the feed solenoid Ill.
The previously described grinding operation on
the work piece is now resumed until the next
.
I
1. In a gear wheel grinding machine of the
kind speci?ed, the combination with a head
stock, a slide movable vertically in the head
stock, a work spindle carried by the slide, a man
is connected by a link 33 to the core 31! of a sole
noid 35 situated in the control box. The circuit
of this solenoid is controlled by a switch 31 (Fig
ure 1) which is operable by a tappet 38 on the
6
claim as new and desire to secure by Letters
ually operable screw for moving the slide in the
headstock, and an index plate carried by the
work spindle, of an intermittently operable feed
ing mechanism for imparting feed movements to
the slide independently of the said screw, means
consisting in part of an electromagnet for actue
ating the feeding mechanism, and means responr
sive to rotational movements of the work spindle
15 for controlling the said electromagnet.
striker 23 comes into action and causes the
grinding wheel to be again moved to the trim
ming position, theprocess being repeated until
the grinding operation is completed.
2. In a gear wheel grinding machine as claimed
in claim 1, the combination with the feeding“
mechanism of electrical contact devices for de
termining the grinding wheel trimming periods.
3. In a gear wheel grinding machine as claimed
in claim 1, the combination with the slide of
a crank arm in pivotal connection with the slide,
a link having one end in pivotal connection with
the crank arm, the axes of the two said connec
tions being eccentric with respect to each other,
In order that the attendant may be warned
and means effecting pivotal connection. between
when the grinding operation is approaching com
the other end of the link and the screw.
pletion, I arrange in association with the dial it
4. In a gear wheel grinding machine having
another switch. This is located within the dial
(see Figures‘5 and '7) and it comprises a pair of 30 the features claimed in claim 1, the combination
of a crank arm in pivotal connection with the
contacts 40, M, and a pivoted contact member 42
slide, a link having one end in pivotal. connec
loaded by a spring 43. Also to the inside of the
tion with the crank arm, the axis of the two con
dial are secured at appropriate positions a pair
nections being eccentric with respect to each
of strikers M, 45. The striker 44 extends beyond
the inner periphery 46 of the dial t and the strik 35 other, means for effecting pivotal connection be
tween the other end of the link and the screw, a
er 45 has a recessed inner end as shown. The
peripherally notched disc, a pawl for imparting
member 42 is operable by a plunger 41 which
intermittent angular movements to the disc,
bears at one end against the said periphery 46
means for transmitting movements from the disc
and at the other end against the member 42.
When the dial t reaches the position at which the 40 to the crank arm, a solenoid for moving’ the
pawl in one direction, and a spring for moving
?nal trimming operation is to be effected the
striker 44 causes the plunger 41 to move the‘ mem
ber 42 on to the contact 40. This closes a cir
cuit containing any convenient warning device
the pawl in the opposite direction.
5. In a gear wheel grinding machine having
the features claimed in claim 1, the combination
such as a lamp which announces to the attendant 45 of a crank arm in pivotal connection with the
that the ?nal trimming stage has been reached.
When the last striker 23 comes into action the
striker 45 allows the plunger 41 to move, so that
the spring 43 can move the member 42 onto the
contact M. This closes a circuit containing an 50
other warning device such as a lamp which an
nounces that the grinding operation is completed.
slide, a link having one end in pivotal connec
tion with the crank arm, the axes of the two con
nections being eccentric with respect to each
other, means for effecting pivotal connection be
tween the other end of the link and the screw, a
peripherally notched disc, a pawl for imparting
intermittent angular movements to the disc,
means for transmitting movements from the disc
to the crank arm, a solenoid for moving the pawl
slide b to be retracted to the trimming position
in readiness for commencement of operations on 55 in one direction, a spring for moving the pawl in
the opposite direction, a pinion associated with
the next work piece to be inserted in the ma
the disc, a slidable rack in engagement with the
chine. Before the operations above described are
pinion, and means interconnecting the rack and
repeated on the next work piece, the attendant by
crank arm.
means of the ‘handle 6 on the dial 13, turns the
6. In a gear wheel grinding machine having the
dial back to its initial position which is de 60
features claimed in claim 1, the combination of a
termined by the abutment of a stop 50 on the
crank arm in pivotal connection with the slide, a
dial against a ?xed stop 5| situated adjacent to
link having one end in pivotal connection with
the part 3!, the stop 5! serving also to support
the crank arm, the axes of the two connections
the said part 31 in its normal position under
the pressure of the spring 32.
65 being eccentric with respect to each other, means
for e?ecting pivotal connection between the other
By this invention the feed movements of the ‘
end of the link and the screw, a peripherally
machine, and the determining of the grinding
notched disc, a pawl for imparting intermittent
Wheel trimming periods are effected automati
‘angular movements to the disc, means for trans
cally in a simple and satisfactory manner, en
abling increased output and greater uniformity 70 mitting movements from the disc to the crank
arm, a solenoid for moving the pawl in one di
of quality to be obtained from machines of the
rection, a spring for moving the pawl in the op
kind speci?ed as compared with earlier machines
posite direction, a pinion associated with the disc,
which have been under the sole control of the
a slidable rack in engagement with the pinion,
attendant.
Having thus described my invention what I 75 means interconnecting the rack and crank arm,
At the same time the last striker 23 causes the
2,411,456
8
and manually operable means for putting the
connections-being eccentric with respect to each
pawl out of action.
other, means for e?ecting pivotal connection be
‘
7. In a gear wheel grinding machine having
the features claimed in claim 1, the combination
of a crank arm in pivotal connection with the
slide, a link having one end in pivotal’ connection
tween the other end of the link and the screw,
a peripherally notched disc, a pawl for impart
ing intermittent angular movements to the disc,
means for transmitting movements from the disc
with the crank arm, the axes of the two connec
to the crank arm, a solenoid for moving the pawl
tions being eccentric with respect to each other,
in one direction, a spring for moving the pawlin
means for effecting pivotal connection between
the opposite direction, a dial associated with the
the other end of the link and the screw, a periph 10 disc, a series of strikers carried by the dial, and
erally notched disc, a pawl for imparting inter
a switch operable ‘oy'the strikers for determining
mittent angular movements to the disc, means
the trimming periods, the switch being also
for transmitting movements from the disc to the
adapted to control the solenoid.
crank arm, a solenoid for moving the‘pawl in’ one
11. In a gear wheel grinding machine having
direction, a spring for moving the pawl in the o'p-V ,, the features claimed in claim 1, the combination
posite direction, a solenoid controlling switch,
and means associated with the work spindle for
closing the switch at the end of each complete
of a crank arm in pivotal connection with the
slide, a link having one end in pivotal connec
tion with the crank arm, the axes of the two con
rotation of the index plate.
1
nections being eccentric with respect to each
8. In a gear wheel grinding machine having 20 other, means for e?ecting'pivotal connection be
the features claimed in claim 1, the combination
tween the other end of the link and the screw, a
"of a crank arm in pivotal connection with the
peripherally notched disc, a pawl for imparting
slide, a link having one end in pivotal connec
intermittent angular movements from the disc
tion with the crank arm, the axes of the two
to the crank arm, a solenoid for moving the pawl
connections being eccentric with respect to each
in one direction, a, spring for moving the pawl
other, means for effecting pivotal connection be
in the opposite direction, a dial associated with
tween the other end of the link and the screw,
the disc, a series of strikers carried by the dial,
a peripherally notched disc, a pawl for imparting
a switch operable by the strikers for determin
intermittent angular movements to the disc,
ing the trimming periods and controlling the sole
means for transmitting movements from the disc
noid, a plunger for imparting movements from
to the crank arm, a solenoid for moving the pawl
in one direction, a spring for moving the pawl
the strikers to the switch, a pivoted member car
in the opposite direction, a Solenoid controlling
to the said member for retracting the plunger
from the striker by which the plunger has previ
switch, and a striker on the index plate for
closing the switch‘ at the end of each complete ro
tation of the index ‘plate.
9. In a gear ‘wheel grinding machine having
the features claimed in claim 1, the combina
rying the plunger, and a solenoid connnected
ously been actuated.
'
12. In a gear wheel grinding machine, having
the features claimed in claim 1, the combination
of a crank arm in pivotal connection with the
tion of a ‘crank ‘arm in pivotal connection with
slide, a link having one end in pivotal connec
the slide, a'link having one end in pivotal con 40 tion with the crank arm, the axes of the two con
nection with the crank arm, the axes of the two
nections being eccentric with respect to each
connections being eccentric with respect to each
other, means'ior effecting pivotal connection be
tween the other end of the link and the screw,
a peripherally notched disc, a pawl for impart
ing intermittent angular movements to the disc,
means for transmitting movements from the'disc
to the crank arm, a solenoid for moving the pawl
in one direction, a spring for moving the pawl
in the opposite direction, a dial associated, with
the disc, a series of strikers carried'by the dial,
and a switch operable by the strikers for deter
other, means for effecting pivotal connection
between the other end of the link and the screw,
_ a peripheraliy notched disc, a pawl for impart
‘ing intermittent angular movements to the disc,
means for transmitting movements from the disc
to the crank arm, a solenoid for moving the pawl
in one direction, a spring for moving the pawl
in the opposite direction, a dial associated with
3the disc, a series of strikers carried by the dial,
a switch operable by the strikers for determin
ing the trimming periods, another switch associ
mining the trimming periods.
'
ated with the dial and adapted to control the
10. In a gear wheel grinding machine having
‘circuits of warning devices, and strikers on the
the features claimed in claim 1, the combination 4 dial for actuating the latter switch when the
of a crank arm in pivotal connection with the
slide, a link having one end in pivotal connec
tion with the crank arm, the axes of the ,two
grinding operation is approaching completion.
ARTHUR HITCHCOCK ORCUTT. “
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