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Патент USA US2132941

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Oct. 11, 1938.
Filed Dec. 24, v1955
4 sheets-sheet 1
Oct. 11, 1938.
Filed Dec. 24, 1955
4 sheets-sheet 2
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JMW" .
Oét. 11, 11938.
c. c5.l FLYGARE
Filed Dec. 24, 1935
4 Sheets-Sheet 3
oct. 1l, 1938.
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Patented Oct. 11, 1938
nom. Gammo MACHINE
Carl G. Fly‘xare. Worcester, Mall., nsignor to
Norton Company, Worcester, Mass., a corpora
tion o! Massachusetts
Application December u, 193s, serial ne. sur:
z claim.
(ci. 514s)
This invention relates to a grinding machine,
and more particularly to a crowning attachment
for a roll grinding machine to generate a prede
termined crown onthe periphery of 'a roll.
One of the objects of this invention is to make
a simple, thoroughly practical crowning attach
ment for a roll grinding machine._ A further ob
ject of this invention is to provide _a roll crown
ing attachment for a roll grinding machine in
10 which the wheel slide is rocked toward and froml
the axis of the roll. A further object is-to provide
a roll crowning attachment in which the grind
ing wheel is rocked toward andl from the work
axis in timed `:relation with the work table re
15 ciprocation to produce the‘desired crown. An
other object is to provide such a crowning
mately on the line 4--4 lof Fig. 3, showing the
table traversing mechanism;
Fig. 5 is a fragmentary cross sectional view,
on an enlarged scale, showing the backlash elim
inating mechanism for eliminating the backlash 5
between the table rack .and the cross shaft;
Fig. 6 is va fragmentary sectional view, taken
approximately on the line 6-8 of Fig. 2, on an
enlarged scale, showing the backlash eliminating
mechanism between the worm and worm gear for lo
driving the crowning cam;
Fig. 'I is a vertical sectional view through the
driving gear, on an enlarged scale, showing the
means for eliminating the backlash in the gear
Fig. 8 is an end elevation of the backlash elim
gear shown in Fig. 7; and
attachment which canbe readily disconnected to inating
Fig. 9 is a fragmentary sectional view, on an
permit truing of the" grinding wheel while the
v enlarged scale, taken approximately on the line
wheel remains stationary. '
A further object' of this invention is to provide - 9_9 of Fig. 8.
A roll grinding machine has been illustrated
a roll forming attachment in which the grinding
wheel slide is rocked toward and from the work in the drawings comprising a base III which sup
ports a longitudinally reciprocable work table
axis during the relative longitudinal reciproca
tion therebetween, in which the crowning device II on the usual flat way I2 and V-way I3. The
25 may be readily disconnected to stop the rocking' vlongitudinally reciprocable table II is provided 25
' of the grinding wheel and may be readily con
_ nected so that the rocking motion is picked up
in identically the same position prior to stopping
the motion for truing.
Another object of this invention is to provide
a roll crowning attachment in which the grind
ing wheel is rocked toward and from the work
axis by a mechanism actuated by the work table
reciprocation, in which backlash is entirely elim
35 inated between the driver and the cam for rock
ing the wheel slide. Other objects will be in
part obvious and in part pointed out hereinafter.
This invention accordingly consists in the fea
tures of construction, combinations of elements,
and arrangements of parts, as will be exemplified
40 in the structure to be hereinafter described, and
the scope of the application of which will be
indicated in the following claims.
‘with a rotatable work support comprising a mo
tor driven headstock I6 and a footstock I1 which
serve to rotatably support a roll I5 to be ground.
The roll I5 may be mounted on centers, as is ‘
common practice in the art, or ii the roll is very 3o
massive in construction, it may be mounted in
journal rests (not shown), as shown in the prior
United States patent to Norton No. 1,096,188
dated May 12, 1914, to which reference may be
had for the details of the support for the work. 35
A rotatable grinding wheel 2U is supported on a
rotatable wheel spindle 2l which is in turn sup
ported on a wheel slide 22. The wheel slide 22
is connected by a pair of aligned studs or trun
nions 23 arranged on opposite sides of the wheel 40
slide, and which are supported on a transversely
movable intermediate slide 24. The intermedi
ate slide 24 is arranged to slide transversely on
the base I0 on a pair of spaced slideways 25 (only
In the accompanying drawings, in _ which is
one of which has been shown). The intermedi- 45
.Ca shown one 'of various possible embodiments of the ate slide 24 is arranged to be moved transversely
mechanical features of this invention,
Fig. 1 is a front elevation of a grinding ma-v relative to the base Ill by means of a suitable
wheel feeding mechanism. This mechanism may
chine embodying this invention;
Fig'. 2 is a cross sectional view through the be of any well-known type, such as, for example,
that shown in the prior United States Patent to 50
50 grinding machine, on an enlarged scale, taken ap
Norton No. '162,838 dated June 14, 1994. This
proximately on the line 2--2 of Fig. 1;
Fig. 3 is a fragmentary elevation, on an en
larged scale, having parts broken away to show
the table traversing mechanism;
Fig. 4 is a cross sectional view, taken approxi
mechanism may comprise a half nut 28 depend
ing from the transversely movable intermediate
slide 24. 'I'he half nut 2l mates with a rotatable
feed screw 29 which is journaled in bearings 55
(not shownl inthe base |0. 'I'he front end of
the feed screw 29 is provided with a gear 30
which meshes with a gear 3| ymounted on the
rear end of a rotatable- shaft 32. 'I’he shaft 32
is rotatably supported in the base I0 and is pro
vided on its front end with a gear 33 meshing
with a gear 34> mountw on a rotatable shaft 35,
the outer end» of which supports a manually oper
able hand feed wheel 36. By rotation of the
10 hand wheel 36, a rotary motion may be trans
mitted to the gears above deseribed to rotate the
usual manner by means of a reversing lever 6||_which is actuated by reverse dogs 6| and 62 which
are adjustably supported in a T-slot 63 on the
front of the work table Il. The reverse leverV
operates through a load and fire-mechanism 64
to control the movement of the clutch 5| to con
trol the direction of reciprocatory movement of
the table H.
ì The shaft 51 carries a gear 10 which meshes
with a gear 1| mounted on a shaft 12. The shaft 10
12 also carries a gear 13 which meshes with a
cross feed screw 29 which serves to cause anl gear
14 mounted on the shaft 42.
endwise movement of the’ half nut 26 to feed the
intermediate slide 2e and the wheel slide 22
In order that the power reciprocation of the
15 either toward or from the work piece I5 to grind . table I | may be disconnected, a clutch member 15
is interposed between the gear 1| and the gear
the roll I5 tc- a predetermined size. I
In the grinding of cylindrical rolls for a roll
ing mill, it is frequently necessary te produce a
roll -which is not a true cylinder but which is
20 vprovided with an outer surface which is formed
either concave or convex to a deñection curve or
15. When the clutch is in the position illus
trated -in Fig.` 4,'the power reciprecation of the
table is disconnected. A yoked member 16 en
gages the clutch member E5 and is supported by
a longitudinally movable shaft 11 which is actu 20
ated by a lever 1e on the front of _the machine
base. When the lever is rocked toward the ma
the drawings. the form or crown on the roll I5 chine base, the shaft 11 is moved toward the
25 is produced by rocking the wheel slide 22 about left, as viewed inl Fig. 4, to move- the clutch
member '15 in the same direction to engage it 25
its pivot 23 and relative to the transversely mov
able intermediate slide 24 as the roll I5 and with a clutch member 19 which is formed in
grinding wheel 20 are reciprocated longitudinallyl tegral with the gear 13. When the clutch mem
ber 15 is moved into engagement with the clutch
relative to each other.
19, the'power rotation of the gear 1| is
In- the construction illustrated in the drawings, transmitted
through the gear 13, the gear 14, the 30
the work supporting table Ii is reciprocated lon
pinion 4|, to the rack 40 to reciprocate the table
gitudinally relative to the base I0 and the grind
ing wheel 20 to traverse the roll being ground || longitudinally relative to the base I0. For
past the operative face of the grinding wheel 20. further details of disclosure as to the manual’or
35 The table
is provided'with a depending rack power traverse of the table I I, reference may be
bar 40 by which the table may be traversed by a had to the disclosure in the above-mentioned 35
otherwise, according to the requirements of the
lrolling mill. In the machine, as illustrated in
manual or power traverse mechanism, .such as
' that shown in the prior United States patent to
Norton No. 762,838 dated June 14, 1904. This
40 mechanism has not been shown in detail, since
it is not considered part of the present invention;
and reference may be had to the above-men
tioned patent for details of disclosure.
prior patent to Norton.
In order to produce a predetermined rocking
motion of thewheel spindle 22 to rock the grind
ing wheel- 20 toward and from rthe axis of the
roll I5, itis desirable to provide a mechanism
to time the rocking motion of the wheel with the 40
longitudinal relative reciprocation between the
A gear ¿I4 meshes with the rack 40 and is wheel 20 and the roll I5. This is preferably ac
mounted lon a rotatable shaft 42 which, may be eomplished by providing a gear 90 which meshes
`with the table driving rack _40 on the under side
rotated manually by means of a gear 43 mounted vof
the table ||. The gear 90 is mounted on a
on the outer end of the shaft 42. The gear 43
shaft 9| which is journaled in bearings
meshes with a gear'44 rotatably mounted on a
stud 45. A manually operable traverse wheel 46 in the base I0 of the machine. The rear end of
the shaft 9| is provided with a gear 92 meshing
is mounted on a hub of the gear 44 and con
nected thereby, by means c-f which the table || with a gear 93 mounted on a rotatable shaft 94. 50
may be traversed iongitudinally 0f the base I0 VThe shaft 94 also carries a gear 95 which meshes
through the gear 44, the gear 43, the shaft 42 and with a gear 96 mounted on 4a rotatable shaft. 91.
The shaft 94 and the gears 93 and 95 carried
the gear 4i meshing with the rack bar 40.
The table |I may be reciprocated longitudinally thereby are supported on a swinging arm 98
by a power operated mechanism, as shown in the which is supported to, rotate on the shaft 9|.
pri-or patent above referred to. This mechanism This permits the gear 96 to be changed when
may comprise a rotatable power driven shaft 50 desired and the gear 95 to be swung into proper
mesh with the gear 96 and locked in mesh there
which is driven by a multiple speed drive con
with by a . clamping screw 99 which passes
60 tained within the casing 5I, details of'which have
not been shown in the present case since they through the bracket 98 and is threaded into a 60
are not considered part of the present invention. portion of the base I0. The outer „end of the
For details of this mechanism, reference may shaft 91 is preferably formed as a splined shaft
be had to the above-mentioned prior patent. 'I'he >|00 which ’ passes _through a correspondingly
65 rotatable shaft 50 drives a clutch member 5|
shaped aperture within a worm I0| which vis ro
which is arranged to engage either the clutch tatably supported within a gear easing |02. The 65
member 52 or the clutch member 53 which are gear casing |02 is rigidly fixed to the trans
' formed integral with bevel gears 54 and 55 re
versely movable slide 2€. The worm I 0| meshes
spectively. 'I‘he bevel gears 54 and 55 mesh with with a worm gear |03 mounted on a transverse
70 a large bevel gear 56 mounted on the front end shaft |04 ,iournaled in bearings |01 and |0:_.-‘=
of a rotatable shaft 51. 'I'he large bevel gear; 56 within the gear casing |02. The shaft |04 sup=
is rotated in either direction, depending'upon
the engagement of the clutch member 5| with
either the clutch member 52 or 53.
The clutch member 5| maybe shifted
ports a rotatable cam | | 0 which is arranged to
engage a rotatable follower roller ||| which is
keyed to-a stud |I2. The studl |I2 is rotatably
supported in bearings I I3 and |ë‘4 which are held
in a casing I|5 which is rigidly fixed to the rock
ing wheel slide 22.
The gear casing |52 is provided with an up
wardly projecting stop surface ||5 which is ar
ranged to be engaged by an adjustable screw ||1
which is threaded into a bracket ||5 which is
fastened to the rear end of the rocking wheel
slide 22. If it is desired to _hold the wheel slide
against rocking motion, the screw |_|1 may be
10 adjusted to raise the rear end of the wheel slide
thereto. The nut |35 is provided with a cup
shaped extension |35 toward the right. as viewed
in Fig. 5, which is provided with an internal
thread |31 meshing with a threaded portion |35
on the sleeve |21. It will be readily apparent from
the foregoing disclosure that when the nut |35
is rotated while the shaft' 5I is held stationary by
applying a wrench to an end portion |45 thereof,
rotation of the nut |35 serves through the threads
|31 and |35 to cause an endwise movement of the 10
sleeve |21 either to clamp or unclamp the sleeve
operative engagement with the cam` ||5, so that |2| to the portion |22 of the shaft 5|.
In order to eliminate the backlash. a gear | 45
even though the cam ||5 is rotated by the longi
tudinal movement of the work table ||, no rock-r is rotatably mounted on the sleeve |2| and is of 16
ing motion will be transmitted to the wheel the same size and having the same number of
teeth as the gear 55. 'I'he gear 55 is provided with
slide 22.
a plurality of projecting lugs |45 which are ar
In orderthat the roll being formed may be ac
curately ground to a predetermined crown, it is ranged to be engaged by a plurality of lugs |41
-projecting from the gear |45, the contacting faces
essential that the grinding wheel 25 and its sup
porting slide 22 be rocked through an identical of the lugs |45 and '|41 being at an angle to the
path when the table || is reciprocated in either
direction. Due to the backlash in the gear drive, greater than the angle of repose. The gear |45
this is a diillcult problem since when the table` is urged toward the right, as viewed in Fig. 5.
is reciprocated longitudinally in one direction, by a plurality of springs |55 which extend in 25
the backlash in the gear connection between the apertures |5| in the hub of the gear |45 and are
table rack and the cam for rocking the wheel interposed between the gear |45 and a collar |52
slide will be taken up and the wheel will be moved adjustably positioned on the sleeve |2|. The col
through one path and when the table is reversed lar |52 may be adjusted longitudinally relative
in its direction of movement by the shifting of to the sleeve |2| by means of the threaded col~ 30
the reverse lever 55, the change in direction of lars |53 and |54. By adjusting the collar |52
the movement of the rack 45 serves to first take along the sleeve I2 I, the tension of the spring |55
up the backlash in the gear drive between the may be varied so that the springs cause the sur
22 so that the follower roller ||| is raised from
rack 45 and the cam ||5 before the rocking move
merit of the wheel slide starts in the reverse di
35 rect‘ion, thus providing a variable which serves to
cause the grinding wheel to rock in a different
path on its stroke in opposite directions. In order
to eliminate this difficulty, a series of backlash
eliminators have been provided to take up the
40 backlash between the worm |5| and the cam ||||
and to eliminate any backlash in the gear train
52, 53, 55, 55, thus eliminating lost motion so that
when the table || is moved- in either direction, an
identical rocking motion is transmitted to the
grinding wheel 25 when the roll I5 and table ||are reciprocated in either direction.
En order to eliminate the backlash between the
rack 45 and the gear 55, a suitable mechanism is
provided. The gear `55 is keyed by a key |25 to
a sleeve |2| which is rotatably supported on a
reduced portion |22 of the shaft 5|. The sleeve
|2| is rotatably journaled in bearings |23 and |24
which are fixed to the base I5 so as to provide
a ñxed rotary support for the sleeve |2|. The
sleeve |2| is provided with a plurality of slots |25
at its left-hand end, as shown in Fig. 5, and the
outer surface of this end of the sleeve is tapered
to mate with an internal conical surface |25
within a rotatable sleeve |21 mounted on a fur
ther reduced end portion |25 of the shaft 5|. The
sleeve |21 is slidably keyed to the shaft |25 by a
key |29. The sleeve |21, when moved toward the
right as viewed in Fig. 5, contracts the split end
of the sleeve | 2| and clamps it securely to the
65 reduced portion |22 of the shaft 5|.
To readily adjust the sleeve |21, a nut |35 is
rotatably mounted on a reduced portion v|3| of
the shaft 5| and is held in place-thereon by means
of thrust washer |32. Thrust washer |33 is inter
posed between the inner surface of-the nut |35
and the shoulder on the reduced portion |3| of
the shaft 5|. A pair of nuts |34 and |35 serve
to lock the nut in adjusted position on the por
tion |3| of the shaft 5| so that it is free to rotate
75 thereon but has no endwise movement relative
face |41 to slide on the surface |45 so that any
lost motion between the gear 55 and the rack 45
is taken up by the rotation of the gear |45 due 35
to 'the vangular thrust of the lugs |45 and |41.
The collar |52 is provided with a pin | 55 which fits
loosely within an aperture or hole |51 in the hub
of the gear |45, so that the gear |45 can rotate
relative to the collar |52. By varying the tension 40
of the springs |55, the opposed thrust of the two
gears 55 and 45 may be varied so as to eliminate
any lost motion and to exert the desired pressure
of the gears |45 and 55 on the rack 45 so that
the shaft 5| is rotated in unison with the rack
when the rack moves in either direction to rotate
the gear 55.
.A similar backlash eliminating device is pro
vided between the worm wheel |53 and the cam
|l5. As illustrated in Fig. 6, the worm gear |53 50
is formed in two halves. The part |53 is connected
by a key |55 to the shaft |54. The half |5| of
the worm gear |53 is rotatably mounted on the
shaft |54 and is provided with an outwardly pro
jecting lug |52 which engages a correspondingly
shaped lug |53 which is formed as an integral
part of the collar |54 which is slidably keyed to
the shaft |54 by a key |55. The collar |54 is
urged toward the right, as viewed in Fig. 6, by a
plurality of springs |55 which are contained with 60
in apertures |51 in the collar |54 and which bear
against an adjustable collar |55. The collar |55
may be adjusted longitudinally on the shaft |54 by
the adjusting collars les and |10. A pin nl is
ilxed to the collar |55 and slides within .an en
larged aperture or hole |12 within the collar |54
so that the collar |54 can rotate relative to the
collar |55. By adjusting the position of the col
lar |55, the tension of the springs |55 may be
adjusted, so that the lugs |52 and |53 cause the
gear section |5| to be rotated relative to the worm
gear part |53 which is keyed to the shaft so as
to eliminate any backlash between the worm
wheel |53 and the worm |5|.
A further backlash eliminating device is pro 75
vided in the gear train 92, 93 to eliminate any
backlash or wear betweenA said gears. As illus
trated, the gear 92 is formed as a two-part gear.
Gear 92 is keyed to the Vshaft 9| by a key |80. A
second part of the gear 92 is formed as an annu
lar ring |8| having teeth cut therein to mate
with the teeth of the gear 9|. The ring gear |8|
fits on a hub portion |82 oi' the gear 92 and may
be locked thereto by clamping screws Ii83 and
10 |84 which pass through elongated slots |85 and
|86 in the gear ring |8| and are screw threaded
into the gear 92.
In order to eliminate the backlash between the
gears 92 and 93, it is necessary to adjust the ring
15 gear | 8| relative to the gear 92. To facilitate ad
justment of the gear | 8| relative to the gear 92,
' the gear ring |8| is provided with a pair of dia
metrically opposed conical surfaces |81 and |88
which are countersunk into the outer surface of
20 the gear |8|. A pair of- screws |89 and |90 pass
through the conical apertures |81 and |88 and are
screwthreaded into the gear 92. Each of the
screws> |89 and |90 is provided with a conical sur
face | 9| which is shaped so that an _element of
25 its surface coincides with an element of the coni
cal counterbored surface |81 or |88. To adjust
the gear ring |8| relative to the gear 92,> the
screws |83 and |84 are loosened and then by
slacking -off on the screw |90 and tightening the
30 screw | 89, the ring gear | 8| may be moved in a
counterclockwise direction relative to the gear 92
to eliminate the backlash between the gears.
When the required adjustment has been made,
the ring gear | 8| and the gear 92 are clamped
35 together by tightening the screws |83 and |84.
The tumbler gear 95 may be adjusted to mesh
to a greater or lesser extent with the gear 96 by
swinging the bracket 98 so that the backlash be-tween these two gears may be eliminated.
It will> thus be seen that a driving mechanism
has been provided which Iserves to rock the grind
ing wheel 20 through a predetermined path. when
the table | | is reciprocated longitudinally and
moves in either direction to produce a predeter
mined concave or convex crown upon the roll be
ing ground, depending upon the nature of the
cam | I0 which ismounted on the machine.
It may be desirable during the truing operation
to disconnect the crowning attachment so that
the wheel 20 may be trued while it remains sta
tionary, that is with the rocking movement there
of stopped. This is preferably accomplished by
unlocking the sleeve I2| from the shaft 9|. It is
desirable that the crowning attachment be dis
55 connectedv in such a way that after a wheel tru
ing operation, the crowning attachment may be
picked up when the table is in a predetermined
I position so that the grinding operation on the roll
being ground may be continued and the desired
60 crown produced after the truing operation has
~ been completed.
In the preferred construction,
an index finger 200 is fixed to the table || and is
arranged to be aligned with a fixed point 20| pro
jecting from the base |0. An indexing finger 202
similarly projects from the base |0 and is ar
ranged to serve as an'index for a graduated scale
203 arranged on the periphery of the sleeve |21.
To disconnect the crowning attachment for tru
ing so that the crowning movement of the wheel
may be picked up at the same point after truing,
the table || is traversed until the index finger 200
is aligned with the fixed point 20| on the base |0.
The reading of the scale 203 opposite the ñnger
202 is then noted and the sleeve |21 then with
75 drawn to disconnect the sleeve I 2| to stop the
rocking movement of the grinding wheel during
the truing operation. After the grinding wheel
20 has been trued to the required extent, the
table is again moved so that the index finger 200
is aligned with the ñxed index point 20| on the
base |0 and a wrenchis applied to the projection
|40 of the shaft 9| to rotate the shaft 9| and the
sleeve |21 until the predetermined graduation on
the scale 203 coincides with the index iinger 202 .
at which point the sleeve |30 is rotated to move 10
the sleeve |21 toward the right, as viewed in Fig.
5, to clamp sleeve |2| to the shaft 9| and thereby
start the crowning> movement of the grinding
wheel in identically the same position as prior to
the truing operation.
The operation of this machine will be readily
apparent from the foregoing disclosure. The
table dogs 6| and 62 are adjusted to the desired
position to permit a reciprocation of the roll 50
to. pass the face to be ground across the periphery 20
of the grinding wheel- 20. The change gear
mechanism on the rear of the machine is then ad
justed to the proper gear ratio for producing a
crown of the predetermined extent.' A roll to be
ground is then placed either on centers on the
machine or,'as above stated, on journai°rests (not 25
shown). The roll is then rotated and the recip
rocation of the table || started and the grinding
wheel 20 is fed into grinding relation with the roll
|_5 by manipulation of the manually operable feed 30
wheel 36.
The grinding operation may then be
continued until the roll has been ground to a
predetermined crown and finished.
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
successfully achieved. As many possible embodi
ments may be made of the above invention and
as many changes might be made in the embodi 40
ment above set forth, it is to be understood that
all matter hereinbefore set forth or shown in the
accompanying drawings is to be interpreted as il
lustrative and not in a limiting sense.
I claim:
1. A roll grinding machine comprising a base, a
longitudinally movable Work supporting table
thereon, a rotatable work support on lsaid table,
means including a rack to reciprocate said table
longitudinally, a transversely movable slide, a
rotatable grinding wheel, a support for said wheel,
pivotal connections between said support and
slide, a rotatable cam, a shaft supporting said
cam which is rotatably mounted on said slide, a
follower roller rotatably mounted on the wheel
support and arranged to engage said cam, a worm
and worm gear supported on said slide and ar
ranged to rotate said cam, means to eliminate the
backlash between the worm and worm gear, a. ro
tatable shaft in the base, gear connections be 60
tween the table rack and said shaft whereby the
shaft is rotated when the table is reciprocated, a
backlash eliminator associated with said gearing,
change gears connecting the other end of said
shaft and said worm, and means to eliminate 65
backlash- in said change gears so that the rocking
movement of the wheel slide is accurately syn
chronized with the table reciprocation so as to
produce a predetermined crown' on the roll being
2. A roll grinding machine comprising a base, a
longitudinally movable work supporting table
thereon, a rotatable work support on said table,
means including a rack to reciprocate said table
longitudinally, a transversely movable slide, a ro
tatable grinding wheel, a wheel spindle to sup
port and produce a predetermined crown on the
port said wheel, a support for said wheel and roll being ground, means to disconnect said driv
spindle which is pivotally mounted on said slide, ing connections to stop the rocking motion of
a rotatable cam mounted on the end of said slide, the wheel, and means including a. graduated scale
a follower roller arranged to engage said cam and
supported on said wheel support, driving connec
and index to connect said driving connections so
that the wheel is rocked in the same predeter
tions between the table rack and said cam where
by the cam is rotated in synchronism with the
mined path after truing of the grinding wheel.
, table reciprocatìon so as to rock the wheel sup
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