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Патент USA US3075523

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Jan. 29, 1963
3,075,513
W- B. SEIDEL
GRINDING WHEEL TRUING MECHANISM
4 Sheets-Sheet 1
Filed Nov. 8, 1960
52
INVENTOR.
WILLIAM B. SEIDEL
BY
fjvbwav"
ATTORNEYS
Jan. 29, 1963
w. B. SElDEL
' 3,075,513
GRINDING WHEEL TRUING MECHANISM
Filed NOV. 8, 1960
4 Sheets-Sheet 2
W. B- SEIDEL
Jan. 29, 1963
3,075,513
GRINDING WHEEL TRUING MECHANISM
4 Sheets-'Shegt :5
Filed NOV. 8, 1960
‘sol.
'
Jan. 29, 1963
3,075,513
w. a. SEIDEL
GRINDING WHEEL TRUING MECHANISM
4 Sheets-Sheet 4
Filed Nov. 8. 1960
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Patented Jan. 29, M963
Z
3,075,513
GRINDING WHEEL TRUllNG MEQHANISM
Wiiiiam B. Seidel, Cincinnati, Ohio, assiguor to The Qin
cinnati Miliing Machine Co., Cincinna?, Ohio, a cor
poration of Shin
Filed Nov. 8, 19:30, Ser. No. 68,070
10 Claims- (Cl. 125-11)
sected by a straight pro?le portion may be trued as well
as a pro?le in which the straight portion is tangent to the
arcuate portion. The mechanism is accurate and the same
pro?le may be repeatedly trued.
The construction and operation of the truing mechan
ism are described in the following detailed description
with reference to the attached drawings wherein;
FIG. 1 is an elevational view of the truing mechanism.
FIG. 2 is a sectional View of FIG. 1 on line 2-—2.
This invention relates to a grinding wheel truing mech
FIG. 3 is a sectional view of FIG. 2 on line 3-—3.
10
anism adapted for use in a precision grinding machine.
FIG. 4 is a sectional view showing the details of the
in the manufacture of angular contact annular ball
drive input mechanism.
bearings, it is necessary to grind a workpiece pro?le which
FIG. 5 is a sectional View of FIG. 4 on line 5-5.
includes both an arcuate portion and an adjacent straight
FIG. 6 is a schematically represented hydraulic circuit
portion. it is a common practice not to make the straight
to operate the truing attachment.
15
portion exactly tangent to the arcuate portion, but rather
FIG. 7 is an electrical control circuit for operation
to leave a slight corner condition between the two sur
of the hydraulic circuit of FIG. 6.
faces which will hold the balls in the arcuate ball track.
FIG. 8 is a sectional view of FIG. 3 on line 8—8.
The arcuate portion must be ground to a depth slightly
FIG. 9 is a partial section of a grinding wheel show
greater than that to which the straight pro?le portion is
ing the pro?le of the grinding periphery.
ground. Each of the two surfaces is generally ground 20
As shown in FIG. 1, the truing mechanism is located
in a separate operation, the arcuate track being ground
behind the grinding wheel it} which is rotatably supported
?rst and the straight portion being ground in a subsequent
in a grinding machine Wheelhead 11. The truing mech
operation. It is a better practice to grind both the arcuate
anism is supported by a truing carriage 12 which is re
ball track and the ?at land in one operation.
ceived by a slide housing 14 that is ?xed in the wheelhead
25
In grinding both pro?le surfaces in one operation, an
l1 and forms a part thereof. The grinding wheel 19
ccurate grinding wheel pro?le must be generated and
rotates about an axis which is ?xed relative to the slide
maintained. This requires an accurate truing mechanism
housing 14 of the wheelhcad. The truing carriage 12 is
which will create a peripheral contour, the parts of which
movable toward and away from the grinding wheel It}
will not change relative to one another in succeeding tru
by selected rotation of a compensation screw 16 which
ing operations. With a wheel pro?le having a slight cor 30 is axially ?xed relative to the slide housing 14 and thread
ner between straight and arcuate portions thereof, cam
edly engaged with the truing carriage. The compensa
guidance at the corner is dii?cult. Moreover, the use of
tion screw 16 is utilized to move the truing carriage 12
a cam restricts the ?exibility of use of the machine since
relative to the slide housing 14 toward the grinding wheel
a different cam is required for each contour.
19 to maintian the truing mechanism in a position to
It is therefore an object of this invention to provide a 35 perform a truing operation as the grinding wheel it! is
truing mechanism whereby an arcuate portion and adja
reduced in diameter through use.
cent straight portion may be trued on a grinding wheel
Fixed on the end of the truing carriage l2 and forming
periphery by a single truing tool in a single truing opera
a part thereof is a bracket is in which a yoke 2a is
tion without cam guidance.
pivotally received. The yoke 20 is held in the bracket 13
It is a further object to provide a mechanism whereby 40 by pins 22, 24 ?xed therein and extending from the yoke
an arcuate pro?le portion and an intersecting adjacent
into the bracket where they are in pivotal contact with
straight pro?le portion may be trued on the periphery
balls 26, 28 respectively. The balls 26, 28 are held in
of a grinding wheel.
place in the bracket 18 by pin seats 3-9, 32 respectively,
It is another object of this invention to provide a truing 45 ?xed in the bracket. Also contained in the bracket it’;
mechanism whereby the path of the truing tool may be
above the yoke 29 is a gear mechanism 34- by which a
altered to true a variety of grinding wheel pro?les hav
truing tool 42 is moved during a truing operation. The
ing straight and arcuate pro?le portions.
mechanism 34 is actuated by a pair of pistons $6, 38
Still another object is to provide a mechanism for tru
(FIG. 6) which are received in a cylinder block (it; that
ing a straight pro?le portion and an arcuate pro?le por 50 is ?xed on the rear of the bracket 13.
tion in one continuous movement of the truing tool which
The single point truing tool 42 is carried in the yoke
is simply and inexpensively constructed yet which is ac
23 for truing the grinding wheel it? when moved across
curate through repeated operations.
the peripheral cutting surface thereof. As shown in FIGS.
Other objects and advantages of the present invention
2 and 3, the truing tool 42 is received in a truing slide
should be readily apparent by reference to the following 55 member 44 which is received in the yoke it) on antitric~
speci?cation, considered in conjunction with the accom
tion balls is. The anti-friction balls {it are received in
panying drawings forming a part thereof, and it is to be
ball tracks 48, St} in the yoke 2t} and held in spaced rela
understood that any modi?cations may be made in the
tionship to one another by cage members 52, 54. The
exact structural details there shown and described, with
truing tool 42 is adjustable toward and away from the
in the scope of the appended claims, without departing 60 grinding wheel It} by rotation of a screw as which is
from or exceeding the spirit of the invention.
received through a sleeve 53 that extends through a slot
A truing mechanism constructed in accordance with the
659 at the rear of the yoke Ed. The truing tool 42 is held
preferred form of this invention utilizes a single point
in a ?xed angular position in the truing slide 44 since it
truing tool mounted in a truing slide member. The truing
has a longitudinal slot 62 (see FIG. 8) on one side
slide member is received for reciprocal movement in a 65 engaged by a key pin 64 ?xed in the truing slide. When
truing yoke which is pivotal relative to the grinding wheel.
the truing tool 42 is axially positioned to true a particular
A rotary driving member develops a torquelwhich is di
radius, with the point of truing tool 42 a predetermined
vided by the mechanism to produce movement of the tru
distance from the axis de?ned by the center of pivot balls
ing slide in the yoke and pivotal movement of the yoke,
26, 2d, a locking screw 66 is tightened down to rigidly
the yoke remaining stationary while the slide is moved 70 ?x the tool in the truing slide 44.
therein. The relative movements of the slide and yoke
By moving the truing slide 44 in the yoke 2t? while hold
are adjustable to produce movement of the truing tool
ing the yoke stationary, a straight pro?le portion may be
through a path by which an arcuate pro?le portion inter
sweets
is
trued on the grinding wheel it“). By stopping the move
ment of the truing slide 44 in the yoke 29 and then by
swinging the yoke, the point of the truing tool 42 will
move in an arcuate path for truing an arcuate pro?le por
tion on the peripheral surface of the grinding wheel 15?‘.
The gear mechanism 34 is shown in detail in PEG. 4.
Limited rotary motion is introduced to the actuating
mechanism 34 from the pair or" reciprocating pistons 36,
ll
tion is necessary to move the truing slide 44 (FIG. 2)
from engagement with the ?xed stop 98 through a dis—
tance 1% to engagement with the left stop 162. ‘When
the stop 102 is engaged by the truing slide 44 and the
sleeve 72 (FIG. 4) continues to rotate in the same direc
tion, the balance of the rotary movement, 90 degrees,
is transferred to the yoke 29 to swing it thrOugh an arcu»
ate path. The engagement of the stop Hi2 by the truing
355 in the cylinder block 4% (FIG. 6). Connected to each
slide 44 ?xes the truing slide in the yoke 24} and the
of the pistons as, 33 is a drive chain 6%. The chain 68
10
force
created by the continued rotary movement of the
is pinned at its center to to a rotatable sleeve '72. "the
sleeve '72 in the same direction is transmitted through the
sleeve 72 is received in annular bearings 74, ‘.76 which are
stop 182 to the yoke 2d. The force produced thereby
received in a retainer member '77 ?xed in the bracket 33.
tending
to swing the yoke 2% is greater than the resistance
The sleeve is rotatable around the pin 22, ball 25, and pin
to movement of the yoke created by the drag seal 92.
seat so as the chain ss is moved. On the lower end of
The yoke 2b then becomes more freely movable than
the sleeve '72 is a gear 78 Which is ?xed for rotation tl1ere~
the truing slide 44- during cOntinued rotation of the sleeve
with by a key 8%. A nut 82 holds the gear 78 on the
which
sleeve is'72.?xed
Intomesh
the upper
with the
end gear
of a shaft
78 is 85
a sector
which gear
extends
into the yoke 29, as shown in FIG. 1, where it is journalcd
for rotation. As shown in FIG, 3, a pinion gear 88 is fixed
on the lower end of the shaft as. The pinion 38 is engaged
with a rack gt} which is machined on the rear of the truing
slide 44.
By the described mechanism, reciprocal motion of the
pistons 36, 38 (FIG. 6), to which the chain n3 is attached
at each end, is converted into rotary motion at the sleeve
'72 (HQ. 4). The rotary motion of the sleeve 72 produces
a torque which is transmitted from the gear 78 through
the sector gear so to the shaft 86. The shaft 36, pinion
$8, and rack 98* converts the torque into motion of the
truing slide. To allow the truing slide 44 to be moved
by the pinion 88, the yoke 23 must offer more resistance
72 through the second 90 degrees.
By the combination of the movement of the truiug
slide 44 in the yoke 2t) and the subsequent pivotal move
ment of the yoke, the truing tool
is carried along a
path havinga straight portion and an arcuate portion.
The point of the vtruing tool (52 then may be utilized to
true a grinding Wheel l0 having a pro?le contour which
includes a straight portion and an arcuate portion.
If
the stop 102 (FIG. 8) is positioned such that the point
of the truing tool 42 is swung about a radius which is
equal to the perpendicular distance from the center of
the radius to the straight portion of the path traced by
the point, the straight portion of the path would be tan
gent to the arcuate portion of the path. The mechanism
may thcn‘be used to true such a pro?le on the periphery
of the grinding wheel ill. The point of tangency and
the center C of the arcuate portion de?ne a centerline
to movement than the slide 454, or otherwise the yoke would
tend to be swung by the movement of the gear ‘72.1. An 35 of pivot CL, FIG. 9, used as a reference line for altering
the relationship of the straight and arc-uate portions of
annular drag seal “2 is received in the bracket 18 and
the path traced by the truing tool 42.
engaged with an annular surface 94 on the top of the
yoke
The drag seal 92 in addition to keeping grinding
dirt out of the gear mechanism, creates a resistance to
movement of the yoke which, in combination with anti
friction balls as, renders the truing slide 441 more freely
movable than the yoke. Consequently rotary motion of
the shaft 86 in the yoke 2i)‘ will occur and the truing slide
44 will move transversely in the yoke.
If the stop 192 (MG. 8) is adjusted to terminate th
movement of the truing slide 44 in the yoke 29 at a place
where the point of the truing tool 42 (FIG. 3) is swung
about a radius which is greater than the perpendicular
distance from the center of the radius to the straight poi»
tion of the path, the straight portion of the path traced
by the truing tool would intersect the arcuate portion
of the path, that is, the straight portion would not be
if the movement of the truing slide
in the yoke 26 45 tangent to the arcuate portion. One form of this condi
is stopped before the rotary input of sleeve 72 is exhausted,
tion is shown in FIG. 9. The grinding wheel 15} has a
the remaining torque produced at the sector gear 84 may
straight pro?le portion res and an arcuate pro?le por
be utilized to swing the yoke in the bracket 18. There
tion 110. The available straight movement of the truing
fore a pair of stop members 98, 161) (FIG. 2) are received
tool is represented by dimension 112 and is equal to the
in one side of the yoke 24} and a third stop member M2 50 dimension 106 in FIG. 8. If all available straight move
(PEG. 8) is received in the same side of the yoke but
ment were used, the resulting form would be a straight
extends through the truing slide 44 to the opposite side
portion tangent to an arcuate portion. The stop 102,
where it is adapted to engage the bottom of a counter
however, is adjusted to the right (FIG. 8) to shorten
bored portion 194 thereof. (As shown in FIG. 2, stop
the path of the truing slide by an amount equal to di
19?; extends from the side of the yoke Zt‘v and is covered
mension 114 to offset the start of the arcuate path from
by a guard member 96 which is normally received over
the center line of pivot CL. When the straight movement
the adjusting knob 162a of the stop during machine
of the truing slide 42 is stopped, the swing of the yoke
operation.) The stop §S (FIG. 2) is a ?xed stop and
26 begins. The point of the truing tool 42 now traces
limits the extreme movement of the slide 44 at the right
an arcuate path the radius R of which is greater than
side of the yoke 29. The stop 1% is an adustable stop
the perpendicular distance 116 from the center C of the
which may be used in place of the ?xed stop 98 to restrict
arcuate portion 110 to the straight portion of the path.
the extreme movement of the slide 44'; to the right in the
Thus
a stepped relation is created on the grinding wheel
yoke 26) but to a selected point to the left of the ?xed
periphery, the step being represented by the dimension
stop 93. As shown in FIG. 2 the truing slide 44 is in its
extreme right position. The left side stop 102 (FIG. 8) 65 S, and the straight portion 108 intersects the arouate por
tion 110. The offset dimension 114 may be expressed
is adustable relative to the yoke 2b in which it is threadedly
relative
to the radius R and step S by the formula;
received. Assuming that the stop 16-2 is at its extreme
left adjustment, the dimension 1% represents the allow~
' o?set=\/R2—- (R—S)2
able movement of the truing slide 44 in the yoke 20', or
‘Therefore,
by
calibrating
the knob ‘162a (FIG. 8) on
the length of the straight path which the truing tool 42 70
may trace.
7 7
‘the stop 102, the truing mechanism'may be conveniently
adjusted to true a range of stepped forms on the grinding
By the construction described, assume that the sleeve
wheel.
72 (FIG. 4) may be rotated through a reciprocal rotary
In the speci?c embodiment described herein, the total
movement of 180 degrees by operation of the pistons 36,
33 (FIG. 6). Of this motion, 90 ‘degrees in' one direc 75 straight movement is assumed to be suchthat at full
v'rnoven'ient of the'truing‘slidedli, a ‘straight'suri'ace tan
3,075,513
5
.gent to an arcuate surface is trued.
shown in PEG. 6. The main fluid pressure line 136 is
connected to the ?uid line 138 which is connected in
the cylinder block as to the left side of piston 36. Line
14a is connected through the valve 134 to return line
142. Piston 36 is forced to the right and the other
piston 38 moves to the left as the chain 68 is moved.
By extending the
dimension lilo (H6. 8),
slide movement beyond the
the mechanism would true a straight surface which would
intersect the arcuate surface but which would produce
no step. In such a case the offset would be in the op
posite direction from the centerline of pivot CL from the
The sleeve ‘72 is rotated counterclockwise, and the truing
tool movement begins. At this time limit switch 11.3
is released and relay 50R is deenergized. Switch SW1
o?set 114 shown in FIG. 9.
In truing the wheel form in FIG. 9, the truing tool
42 would move from position 118 through a straight
path and succeeding arcuate path and stop at position
10
may now be released since the latch circuit through
contacts of relays lCR and 56R (normally closed)
will hold relay lCR energized.
ing position 118. This is done by reversing the action
After the pistons 35, 38 have completed their stroke,
of the pistons 36, 38 (FIG. 6). The sleeve 72 (FIG.
limit switch ZLS is operated by piston as have completed
4) is then rotated through 180 degrees in the opposite
their stroke, limit switch 2L8 is operated by piston 36
direction. Initially, the truing slide 44 moves more free 15 and as a result, relay 60R is energized. When relay
ly since the shaft 86 is rotated in a direction tending to
éCR is energized relay 3C3 is dropped to deenergize
move the truing slide from engagement with stop 162
solenoid lSOL. Relay 42CR is energized at this time
129. The truing tool must then be returned to its start
(FIG. 8) toward stop 93 (H6. 2) and the drag seal ;92
(FIG. 4) opposes movement of the yoke in the opposite
through contacts of relays 5C3. (normally closed), lCR,
and dCR. Relay 40R latches around contacts of relay
Solenoid 2501. is now energized through con
tacts of relay 4~CR and the plunger of valve 134 shifts
to the left. Pressure line 1136 is connected to ?uid line
140, and return line 142 is connected to iluid line 138.
The movement of the pistons 36, 38 is reversed to
return the truing tool' 4-2 to its starting position. Limit
Therefore the truing slide 44 moves ?rst 20 6C3.
direction.
in the yoke 29 and then the yoke finally swings to its
starting position. In such a motion, the truing tool 42
would be moved away from the grinding wheel ll} (FIG.
9) and returned to its starting position file without con
tacting the grinding wheel. Truing contact then occurs
only when the truing tool 42 moves from the start posi
tion 118 to the stop position 12%‘.
switch 21.8 is released immediately as the reverse move
ment begins, dropping relay GCR, and the limit switch
1L3 is operated when the return is completed. Relay
each time and that the spaced relationship of the aircuate
SCR is energized when limit switch lLS is operated.
portion and the straight portion of the periphery re
Relays 1CR and 40R are dropped when relay ECR is
mains constant, the return swing of the yoke 20 to the
energized. When relay 10K is deenergized, relay 208.
starting position must end at the distance from the line
is also cleenergized, and when relay 4GB. is deenergized,
CL each time. Therefore, a stop pin 122 (FIGS. 4, 5)
solenoid ZSOL is deenergized.
is ?xed in a cap 124» which is adjustable relative to the
The truing cycle is then completed, the truing tool
35
top of the bracket 18 and may be locked thereto by a
having moved from its starting position to its ?nished
draw-down bolt 126. The stop pin 122 extends through
position and then returned to the starting position. The
an arcuate clearance slot 128 in the bracket 18. The
length of the straight portion of the path of the truing
To insure that the mechanism tunes the same contour
lower end of the stop pin 122 is adapted to engage a
tool 42 relative to the arcuate portion is determined
by the length of movement of the slide 41% in the yoke 2d
allowed by the setting of the stops 1%, N2 relative
stop 130 ?xed in an angle bracket 132 which is_ secured
to the top of the yoke 29 and moves therewith. As
shown in FIG. 5, the stop 13% is engaged with the stop
pin 122 at the starting position 118. In a truing opera
to one another and to the ?ned stop 93 and the amount
of rotary movement of thes leeve '72 produced by the
tion, the yoke 29 would move counterclockwise (as
pistons 36, 38. The relationship of the straight por
viewed in FIG. 5) and the stop 13o would move away
tion to the arcuate portion is determined by the ad
from the stop pin 122 during the truing of the arcuate 45 justment of the stop 1192 relative to the centerline of pivot
portion of the grinding wheel periphery. Upon the re
turn swing of the yoke 20, the stop 13a would move
back toward the stop pin 122 for engagement therewith.
CL (FIG. 9).
stops 98, 100, 1ii2 (FIGS. 2, 8) in the yoke 20 control
adjusted counterclockwise to allow a predetermined
amount of arcuate movement of the yoke beyond the
if the stops ill-319, 1G2 (FIGS 2, 3) are adjusted to hold
the truing slide 44 in a ?xed position in the yoke, the
The use of the rigid stop 122 to terminate the return
entire rotary movement of the sleeve '72 (FIG. 4) would
swing of the yoke 2% then places the yoke in the same 50 be transmitted to the yoke 29 which would rotate with
starting position relative to line CL each time. Rigid
the sleeve 72. The stop 122 (FIG. 5) would then be
the movement of the truing slide 44 and the result is
repeated movement of the truing tool through an identical
ath.
P An electrical control circuit is shown in FIG. 7 for
55
point shown.
The full 180 degrees of movement of
the sleeve ‘72 can be transmitted to move the yoke
through a 180 degree swing for truing an arcuate
operation of the truing hydraulic circuit shown in FIG. 6.
pro?le across the entire grinding wheel width 1&9 FIG.
In the starting condition, the piston as is in its forward
9). The stop 122 would then be moved in the slot 128
position as shown and piston 33 is in the retracted posi
to the end opposite that in which the stop is shown to
60
tion. Therefore, limit switch lLS is operated and limit
allow for the full swing. As shown, the stop 122 is in
switch 2L8 is in ti o released condition at the start of
a position which would allow for a swing of the yoke
26 of approximately 90 degrees with full movement of
lLS and 2L8 may be adjusted in machine set up for a
the truing slide 44 through the distance 1%. The
particular job.) With limit switch llLS operated relay
range
of swing in the mechanism described can therefore
SCR is energized. Switch SW1 is momentarily closed 65 be adjusted to any value between 90 and 180 degrees.
to start the truing cycle. During the moment that
It a radius of less than 180 degrees is desired on the
switch SW1 is closed, relay lCR is energized through
pro?le with no straight portion, the stop 122 may be set
that switch and immediately relay 2CR is energized
in the appropriate position to provide an accurate start
through contacts of relays 1CR and SCR. Relay 20R
ing position. The trip plungers of limit switches 1LS
70
latches around the contacts of relay SCR. Immediately,
and 21.5 (FIG. 6) would have to be adjusted to operate
relay ECR is energized through the contacts of relays
the control relays at the proper time since the pistons
a truing cycle.
(The trip point of both limit switches
lCR, 2CR and éCR (normally closed). Solenoid ISOL
36, 38 would not complete full travel in the cylinder
is then energized through contacts of relay 30R.
block
as.
When soleonid 1501. is energized the plunger of the
vlt is understood that the speci?c arcuate movements
reversing valve 134 shifts to the right from the position 75
scream
at
referred to herein are for purposes of illustration only
and are not intended to limit the scope of this invention.
What is claimed is:
1. In a grinding machine having a grinding Wheel with
a contoured pro?le thereon, a truing mechanism com
prising in combination, a pivotally movable member
mounted adjacent the grinding wheel, a slidably mov
able member received in said pivotally movable mem
her for transverse movement therein, a truing tool re
otal movement thereof in the other direction a prede
termined amount, said truing tool thereby returned to a
starting position.
4. In a grinding machine having a grinding wheel
with a contoured pro?le thereon, a truing mechanism
comprising in combination, a bracket mounted adjacent
the grinding wheel, a pivotally movable member received
in said bracket on an axis, a slidably movable member
in said pivotally movable member for trans
coived in said slidably movable member and extending 10 received
verse movement therein, a truing tool received in said
therefrom toward said riiiding wheel, means initially
slidably movable member ‘and extending therefrom to
to render one of said movable members more freely
ward said grinding wheel, means to render said slidably
movable than the other of said movable members, means
to render the other of said movable members more freely
movable than said one movable member after a pre
determined movement of said one movable member, a
drive member operatively connected to both of said
movable members, one at a time in one direction in ac
cordance with relative freedom of movement therebe—
movable member more freely movable than said piv
otally movable member, a rotatable drive shaft journaled
in the pivotally movable member and spaced from said
axis, said shaft connected to said slidably movable mem~
her for movement thereof when rotated, a drive member
journaled in said bracket for rotation on said axis and
connected to said drive shaft for rotation thereof, means
tween for truing a straight portion and an arcuate por 20
to rotate said drive member a ?xed amount one way and
tion on the pro?le or" said grinding wheel, and means to
the other way, a pair of adjustable stop members re
reversely move said drive member whereby said mov~
able members move in the reverse direction one at a
time to return said truing tool to a starting position.
ceived in said pivotally movable member for engaging
said slidably movable member to stop movement thereof
before said drive member rotates said ?xed amount and
2. in a grinding machine having a grinding wheel with 25 to connect said drive shaft to said pivotally movable
a contoured pro?le thereon, a truing mechanism compris
member for movement thereof, the adjustment of said
ing in combination, a bracket mounted adjacent the
stop members determining the relative amount of move~
grinding wheel, a pivotally movable member mounted on
merit of said movable members eifected by said ?xed ro
said bracket, a slidably movable member received in said
tation of the drive member and the direction of said
pivotal member for transverse movement therein, means 30 ?xed rotation determining the direction of movement of
to render said slida'ole member more freely movable
said movable members, and means to advance said piv
than said pivotal member, a truing tool received in said
otally movable member toward said grinding wheel
slidable member and extending therefrom toward said
5. in a grinding machine having a grinding wheel with
grinding wheel, a rotatable drive shaft journaled in the
a grinding pro?le including an arcuate portion and a
pivotal member and connected to said slidable member 35 straight portion, a truing mechanism comprising in com
for movement thereof when rotated, a drive member
connected to said drive shaft, means to rotate said drive
member a predetermined amount initially to transmit
rotation to said drive shaft in the pivotal member and
move said slidable member therein, and means to stop
movement of said slidable member in said pivotal mem
her before said drive member has rotated said predeter
mined amount and to connect said drive shaft to said
bination, a truing carriage received adjacent said grind
ing wheel, 1a yoke pivotally received in said carriage, a
pair of transversely spaced stops in said yoke, a truing
slide received in said yoke for movement between said
stops, a truing tool ?xed in said truing slide and extending
therefrom toward said grinding wheel, a drive shaft jour
naled in said yoke and connected to said truing slide, said
drive shaft operable, when a torque is applied thereto, to
pivotal member for pivotal movement thereof, said tru
said truing slide from one of said stops to the other
ing tool thereby moved for truing a straight portion and 45 move
of said stops and thereafter to pivot said yoke for move
an arcuate portion on the pro?le of said grinding wheel.
ment of said truing tool to true said straight and arcuate
3. In a grinding machine having a grinding wheel
portions, and means to apply a torque to said drive shaft.
with a contoured pro?le thereon, a truing mechanism
6. In a grinding machine having a grinding Wheel with
comprising in combination, a bracket mounted adjacent
a grinding pro?le including an arcuate portion and a
the grinding wheel, a pivotally movable member mounted 50 straight portion, a truing mechanism comprising in com
on said bracket, a slidably movable member received
bination, a truing carriage mounted adjacent said grinding
in said pivotal member for transverse movement therein,
wheel, a yoke pivotally received in said carriage on an
a truing tool received in said slidable member and extend
aXis, a pair of transversely‘ spaced stops in said yoke, 21
ing therefrom toward said grinding wheel, means to
truing slide received in said yoke for movement between
render said slidable member more freely movable than 55 said pair of stops, a truing tool ?xed in said truing slide
said pivotal member, a rotatable drive shaft journaled in
and extending therefrom toward said grinding wheel, a
the pivotal member and connected to said slidable mem
rotatable drive shaft journaled in said yoke and spaced
her for movement thereof when rotated, a drive member
from the pivot axis thereof, said drive shaft connected to
journaled in the bracket and connected to said drive shaft,
said truing slide for movement thereof from one stop to
means to rotate said drive member a ?xed amount in one 60 the other stop of said pair of stops and thereafter for
direction initially to transmit rotation to said drive shaft
pivotal movement of said yoke when a torque is applied
in the pivotal member and move said slidable member
to said drive shaft, and a drive mechanism operable to
therein, means to step movement of said slidable mem
produce a torque and including a drive member journaled
ber in one direction in said pivotal member before said
in said carriage and rotatable about the pivot axis of said
drive member has rotated said ?xed amount and to 65 yoke, said mechanism connected to said drive shaft for
connect said drive shaft to said pivotal member for piv
transmission of said torque thereto to effect movement
otal movement thereof in one direction a predetermined
of said truing slide and said yoke for truing said straight
amount, said truing tool thereby moved for truing a
and arcuate pro?le portions.
straight portion and an arcuate portion on the pro?le of
7. in a grinding machine having a grinding wheel with a
said grinding wheel, means to e?ect rotation of said
grinding pro?le including a straight portion and an arcuate
drive member said ?xed amount in the other direction,
portion, a truing mechanism comprising in combination,
and means to stop movement of said slidable member
a truing carriage received adjacent said grinding wheel, a
in the other direction in said pivotal member before said
yoke pivotally received in said carriage, a pair of trans
drive member has rotated said ?xed amount and to
versely spaced stops in said yoke, a truing slide received
connect said drive shaft to said pivotal member for piv
in said yoke for movement between said steps, a truing
3,075,513
tool ?xed in said truing slide and extending therefrom
toward the grinding wheel, a rack ?xed to said truing
slide, a rotatable drive shaft journaled in said yoke, said
shaft having a pinion ?xed thereto and engaged with said
rack, a drag member received in said carriage and en
yoke, a pinion ?xed to said drive shaft and engaged with
said rack, a drag member received in said bracket and
engaged with said yoke, said drag member effective to
render said truing slide more freely movable than said
yoke, means to apply a torque to said drive shaft in one
direction to move said truing slide from one stop to the
gaged with said yoke, said drag member effective to
impede movement of said yoke and to render said truing
other stop of said pair of stops and thereafter to pivot
said yoke away from said positive stop a predetermined
slide more freely movable than said yoke, means to apply
amount for movement of said truing tool in said straight
a torque to said shaft to effect movement of said truing
and arcuate paths to true said straight and arcuate portions
slide from one of said stops to the other of said stops 10 of said ‘grinding wheel pro?le, the relative adjustment of
and thereafter to pivot said yoke a predetermined amount
in one direction, said truing tool thereby tracing a path
for truing said straight portion and said arcuate portion,
said pair of stops determining the relative length and rela
tionship of said straight and arcuate paths and the posi
tive stop determining the starting position from which said
and means to reverse said torque to effect movement of
truing tool is moved, means to reverse said torque to ro
said truing slide from the other of said stops to the one 15 tate said drive shaft in the other direction and move said
of said stops and thereafter to pivot said yoke said pre
determined amount in the other direction.
8. In a grinding machine having a wheelhead and a
grinding wheel rotatably received therein, said grinding
truing slide from the other stop to the one stop of said
pair of stops and thereafter to pivot said yoke to engage
said positive stop, and means to advance said carriage
toward said grinding wheel for positioning said truing tool
wheel having a grinding pro?le including a straight portion 20 relative to the periphery of said grinding wheel.
and an arcuate portion, a truing mechanism comprising in
10. In a grinding machine having a wheelhead and a
combination, a truing carriage received in said wheelhead,
grinding wheel rotatably received therein, said grinding
a pivotally movable yoke received in said carriage on an
wheel having a grinding pro?le including a straight por
axis, a positive stop in said carriage adapted to engage said
tion and an arcuate portion, a truing mechanism compris
yoke, a pair of transversely spaced stops in said yoke, a
ing in combination, a truing carriage received in said
truing slide received in said yoke for movement between
wheelhead for movement toward said grinding wheel,
said pair of stops, at truing tool ?xed in said trning slide
said carriage having a bracket extending therefrom, a piv
and extending therefrom toward said grinding wheel, a
otally movable yoke received in said bracket on an axis,
rack ?xed to said truing slide, a rotatable drive shaft jour
a positive stop received in said bracket and adapted to
naled in said yoke, said drive shaft parallel to the pivotal 30 engage said yoke, a pair of transversely spaced stops in
axis of said yoke and spaced therefrom, a pinion ?xed to
said yoke, a truing slide received in said yoke for move
said drive shaft and engaged with said rack, a drag mem
ber received in said bracket and engaged with said yoke
ment between said pair of stops, a drag seal received in
said bracket and engaged with said yoke, said seal effec
to render said truing slide more freely movable than said
tive to render said truing slide more freely movable than
yoke, means to apply a torque to said drive shaft to effect
said yoke, a truing tool ?xed in said truing slide and ex
movement of said truing slide from one stop to the other
tending therefrom toward said grinding wheel, a rack
stop of said pair of stops and thereafter to pivot said yoke
?xed to said truing slide, a rotatable drive shaft journaled
a predetermined amount away from said positive stop, said
in said yoke and extending therefrom, said drive shaft par
truing tool thereby tracing a path for truing said straight
allel to and spaced from the pivot axis of said yoke, a
40
portion and said arcuate portion, means to reverse said
gear ?xed to said drive shaft outside said yoke, a pinion
torque applied to said drive shaft to effect movement of
?xed to said drive shaft in said yoke and engaged with
said truing slide from the other stop to the one stop of
said rack, a drive member journaled in the bracket on the
said pair of stops and thereafter to pivot said yoke to en
pivot axis of said yoke, said drive member having a drive
gage said positive stop, and means to adjust the other
gear ?xed thereon and engaged with said gear, means to
stop of said pair of stops relative to the one stop of said
apply a torque to said drive member in one direction to
pair of stops to change the path traced by said truing tool
effect movement of said truing slide from one stop to the
for altering the relation of said straight portion to said
other stop of said pair of stops and thereafter to effect piv
otal movement of said yoke a predetermined distance away
arcuate portion.
9. In a grinding machine having a wheelhead and a
from said positive stop for truing said straight and arcuate
grinding wheel rotatably received therein, said grinding
portions of said grinding wheel pro?le, means to reverse
wheel having a grinding pro?le including a straight portion
said torque to effect movement of said truing slide from
and an arcuate portion, a truing mechanism comprising in
the other stop to the one stop of said pair of stops and
combination, a truing carriage received in said wheelhead
thereafter to pivot said yoke to engage said positive stop,
for movement toward said grinding wheel, said carriage
means to adjust the other stop relative to the one stop of
having a bracket extending therefrom, a pivotally mova
said pair of stops for altering the relationship of said
ble yoke received in said bracket on a pivot axis, an ad
straight and arcuate paths, and means to advance said
justable positive stop received in said bracket and adapted
to engage said yoke, a pair of adjustable transversely
spaced stops in said yoke, a truing slide received in said
yoke for movement between said pair of stops, a truing 60
tool ?xed in said truing slide and extending therefrom to
ward said grinding wheel, a rack ?xed to said truing slide,
a rotatable drive shaft journaled in said yoke, said drive
shaft spaced from and parallel to the pivot axis of said
carriage toward said grinding wheel.
References Cited in the tile of this patent
UNITED STATES PATENTS
2,294,492
Wilson ________________ __ Sept. 1, 1942
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