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Патент USA US3086518

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April 23, 1963
_|_. o. CARLSEN ETAL
3,086,508
GRINDING MACHINE AND WHEEL DRESSER THEREFOR
Original Filed 001:. 18, 1960
4 Sheets-Sheet 1
FIG. I
53
INVENTORS
LEONARD 0-. CARLSEN‘I
By THOMAS A. DEPREZ
6.4mm
ATTORNEY
April 23, 1963
L. o. CAYRLSEN ETAL
3,086,508
GRINDING MACHINE AND WHEEL DRESSER THEREFOR
Original Filed Oct. 18, 1960
_
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April 23; 1963
1.. o. CAR‘LSEN ETAL
3,086,508
GRINDING MACHINE AND WHEEL DRESSER THEREFOR
Original Filed Oct; 18', 1960
4 Sheets-Sheet 3
FIG. 5
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36
April 23, 1963
L. o. CARLSEN ETAL
3,086,508
GRINDING MACHINE AND WHEEL DRESSER THEREFOR
Original Filed- Oct. 18, 1960
4 Sheets-Sheet 4
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United States Patent O?ice
2
1
3,086,508
GRINDING MACHINE AND WHEEL DRESSER
THEREFOR
Leonard 0. Carlsen and Thomas A. Deprez, Rochester,
N.Y., assignors to The Gleason Works, Rochester,
N.Y., a corporation of New York
Original application Oct. 18, 1960, Ser. No. 63,414. Di
vided and this application Jan. 9, 1962, Ser. No.
168,000
11 Claims. (Cl. 125—11)
10
The present invention relates to a cutter sharpening
machine or like machine employing a grinding wheel
and a wheel dresser therefor, and is a division of our co
pending application Serial No. 63,414, ?led October
3,086,508
Patented Apr. 23, 1963
plane, designated 55, which is perpendicular to planes
54, 544’ and parallel to axis 42.
FIGS. 3 and 4 show the mechanism by which the
wheel feed and return motions 45, FIG. 2, are accom
plished. In the wheel head 43 is journaled the spindle
171 on either end of which the wheel W may be mounted.
The wheel head is supported on ball-sleeve bearing 172
for motion in wheel head support 41 in direction 45,
perpendicular to axis 44 of the spindle. Prior to each
wheel dressing operation a ratchet mechanism is operated
to lower the wheel in direction 45 by a predetermined
distance. This ratchet mechanism comprises a piston
173 movable in one direction in a cylinder in the wheel
head support by hydraulic pressure applied to cylinder
15 chamber 174, and in the return direction by a spring 175
when this pressure is released. A pawl 176 pivoted at
A machine according to the invention has a grinding
177 to the piston is urged by a spring 178 into engage
‘wheel with a conical face, a dresser wheel whose axis
ment with a ratchet wheel 179. Upon return motion the
is approximately parallel to a cone element of said conical
pawl engages a stud 181 and is thereby pivoted out of
face, said dresser wheel having a cylindrical surface for
dressing said conical face and a surface of decreasing 20 engagement with the wheel 17-9. The latter has secured
thereto a nut 182 which is threaded onto a screw 183
radius and concave pro?le for dressing an edge radius
secured to the wheel head 43. To eliminate ‘backlash
on the grinding wheel, means for guiding the dresser
‘between the nut and screw, and to frictionally prevent
wheel for motion (a) in a radial direction toward and
unintentional retrograde motion of the ratchet wheel
away from said cone element to dress said edge radius
with said surface to concave pro?le and return, and for 25 when the pawl is released, a nut 184 also threaded to the
screw is keyed to the nut 182 for axial motion relative
motion (b) approximately in the direction of the axis
thereto, and a spring washer 185 is disposed between the
of the dresser wheel to dress said conical face with said
‘two nuts to urge them apart. When the limit of down~
cylindrical surface.
ward wheel feed has been reached, and the wheel W is
In the preferred embodiment of the invention shown
30 to be replaced, upward return motion of the wheel head
in the accompanying drawings:
43 may be effected by manually turning the ratchet wheel
FIGS. 1 and 2 are respectively side and front views of
and nut assembly by means of a wrench applied to
the machine;
socket 186 of the ratchet wheel.
'
FIG. 3 is a section in plane 3—'3 of FIG. 4;
FIG. 5 illustrates the mechanism for effecting the
FIGS. 4 and 5 are vertical sections respectively in
35 motions 38, FIG. 2, for vertical adjustment of the grind
planes 4-~4 and 5-5 of FIG. -1;
ing wheel W and for elevating it to permit indexing the
FIG. 6 is a front view of the wheel dresser mech
cutter, mounting and removal of the cutter, and dressing
anism, parts of which appear on a smaller scale in FIGS.
of
the wheel. A cylinder member 191 is secured to the
1 and 2;
column 36 and slidable in the cylinder bore there is a
‘FIGS. 7 and 8 are sectional views taken respectively in
40 piston 192 having at its upper end a flanged nut 193
planes 7—7 and 8—8 of FIG. 6.
adapted to seat on a ring 194 supported by cylinder
Referring to FIGS. 1 and 2, the machine comprises a
head 195. The nut is threaded to a screw 196 journaled
frame 30 on which a grinding wheel W is mounted for
for rotation in a radial and axial thrust bearing 197 se
reciprocation longitudinally, as indicated by arrow 31,
cured to the bracket 39. On screw ‘196 is a bevel gear
to cause its conical face 32 to traverse sharpening plane
33 of a cutter C to be sharpened, which is also sup 45 198 meshing with a pinion 199 rotatable in the bracket.
By manual rotation of the pinion, by means of a suitable
ported by the frame. The mounting of the wheel includes
wrench, the bracket may be raised or lowered to bring
a column 36 adjustable laterally of the frame, as indicated
the periphery of the wheel into tangency with reference
by arrow 37, and a bracket 39 movable vertically on the
plane
55, FIGS. ‘1 and -2. A cover 201 which telescopes
column, as indicated by arrow 38. A wheel head 43
.is adjustable as indicated by arrow 45 in a direction 50 over the column 36, is movable as a unit with the bracket.
An annular piston 202 in the cylinder is slidable on the
perpendicular to both axis 42 and the wheel rotation axis,
18,1960‘.
designated 44. The wheel is driven by motor 40 carried
by the head 43.
piston 192 and is adapted for abutment by shoulder 203
of the latter. Slidable in the piston 192 is a tappet 204
urged downwardly relative to the piston by a spring 205,
A cutter head bracket 46 is mounted on the frame,
bottom of the tappet being adapted to ride on a cam
beneath the grinding wheel, for adjustment about trans 55 the
or
ring
on a shaft 206 which is rotatable and also axially
verse axis 47. On this bracket a cutter head 48 is
shiftable in the column 36. The tappet is shown as seat
pivotally adjustable about an axis 49 which is perpen
ing on a ring 207 concentric with shaft 206, but by
dicular to axis 47. A housing 51, for spindle 52 which
manually-effected
axial shifting of the shaft, to the left,
supports the cutter C, is adjustable in the head 48 in
a cam 208 secured on the shaft may be brought beneath
the direction of the spindle axis 53 and also angularly
. about that axis.
The machine is adapted to sharpen either right or left
hand cutters by mounting the grinding wheel either in
the tappet.
209.
Also secured to the shaft is a ratchet wheel
By application of hydraulic pressure through lines 210
and 211 to cylinder chambers 212 and 213, piston 202
the position shown‘ at W in full lines or at W’ in broken 65 is held in its down limit position shown, and piston 192
lines in FIG. 2, and by adjusting the wheel head and
is elevated until its shoulder 203 abuts piston 202. This
support, 43, 41, about axis 42 so that the wheel axis
elevates the bracket 39 to indexing position, wherein the
is in position 44 or 44’. In these respective positions
wheel W is clear of the cutter being sharpened. By
the conical face 32 of the wheel traverses sharpening
release of pressure from line 210, pressure in chamber
planes 54 and 54' as the wheel strokes back and forth 70 213 will further raise the piston 192 and cause it to lift
in direction 31, these planes being parallel to axis 42.
the piston 202 into abutment with cylinder head 195.
This elevates the bracket 39 to the position wherein a
In both cases the periphery of the wheel traverses a
3,086,508
a
cutter may be loaded or unloaded and wherein the wheel
W is dressed. From either elevated position the piston
192 is lowered by placing line 211 on exhaust and apply
ing pressure through line 214 to chamber 215. Lower
ing is rapid throughout most of the stroke because spring
4
position 261’ to the left of said plane. The dresser wheel
is then returned, to the right, by pressure applied to
chamber 245, and then is raised, by pressure applied to
chamber 259, to dress the conical surface 32 of wheel W.
Pressure is released from chamber 174, FIG. 3, causing
reset motion of pawl 176, and the bracket 39 is lowered
by piston 192 to bring the wheel W to the reference
plane 55, FIG. 1. When the wheel is in position W’,
205 has lowered the tappet 204 relative to the piston, so
that land 216 of the tappet allows ?uid exhaust through
port 217 in the piston and passage 218 to line 211, but
is slowed when the tappet abuts and is arrested by ring
FIGS. 2 and 6 for sharpening a left hand cutter, the
207 (or cam 208). This shifts the piston relative to the 10 dressing action is the same, except that application of
land, to close off port 217 and cause the exhaust from
pressure to chambers 245 and 246, FIG. 8, is reversed,
chamber 213 to be through a ?ow restrictor 219. A check
so that the edge radius of the grinding wheel is dressed
valve 221 is closed throughout lowering of the piston but
is open while the piston is being elevated.
by motion of the dresser wheel to the right. That is,
as viewed in FIG. 6, the dresser wheel axis shifts from
Ring 2117 is utilized to limit the down motion of the 15 position 261’ to position 261.
grinding wheel in the case of cutters to be sharpened to
At the conclusion of dressing the bracket 39 and
a constant depth. In other instances, where different
wheel W are lowered to grinding position, wherein the
blades around the cutter are to be ground to different
wheel periphery touches plane 55, by piston 192, FIG. 5.
depth, a cam 298 especially designed for such cutter is
Having now described our improved machine, and its
utilized. By means of ratchet wheel 209 and an actuator
operation, we claim as our invention:
for it operating in time with the index means for the
1. A machine adapted to support a substantially
cutter spindle, the rotation of the cam 208 is correlated
frusto~conical grinding wheel in either of two positions,
with indexing rotation of the cutter. The ratchet wheel
with the wheel axis in one position intersecting the line
actuator may be generally similar to that shown in FIG. 3,
of the wheel axis in the other position, and with the
and be hydraulically connected to the actuating piston 25 conical surface of the wheel in said two positions inter
of the cutter spindle index mechanism, described here
secting in parallel lines the common plane of the lines
inafter.
of the wheel axis in said two positions, the machine sup
vThe dressing mechanism for the grinding wheel appears
porting a dresser wheel with its axis in a plane parallel
only partially in FIGS. 1 and 2, and is shown in detail
to and between said lines, said dresser wheel having a
in FIGS. 6 to 8. It comprises a diamond-impregnated 30 cylindrical surface for dressing the conical face of the
dresser wheel 231 having a cylindrical surface 232 for
grinding wheel and a surface of decreasing radius and
dressing the conical face 32 of wheel W as shown in full
concave profile for dressing an edge radius on the grind
lines in FIG. 6 and a concavely radiused surface 233 for
ing wheel, means for guiding the dresser wheel for
dressing a convex edge radius on the wheel as shown in
motion (a) of its axis substantially in said common plane
broken lines in the same view. The dresser wheel is
and perpendicular to the ‘dresser wheel axis to dress the
journaled for rotation in a dresser arm 234, and is
edge of the grinding wheel, in either position of the
driven by a motor 235 mounted on bracket 39, the drive
latter, with said surface of concave pro?le and to bring
being through a ?exible cable 236 encased in a ?exible
said cylindrical surface substantially to either one of said
sheath 237, a bevel pinion 238 journaled in arm 234,
parallel lines of intersection, and for motion (b) approxi
and bevel gear 239 rotatable as a unit with the wheel. 40 mately in the direction of the axis of the dresser wheel
Arm 234 is secured to a piston rod 241 journaled on ball
to dress the conical surface of the grinding wheel with
sleeve bearings 242 for both angular and axial motion
said cylindrical surface.
in a cylinder housing 243. A piston 244 a?ixed to the
2. A machine according to claim 1 in which there
rod is movable axially by means of hydraulic pressure
are means to limit the stroke of motion (a) in both direc
alternately applied to chambers 245 and 246. This motion 45 tions, the dresser wheel at one limit being positioned to
is limited by abutment of end ?ange 247 of the piston
dress the edge radius of the grinding wheel in one posi
rod with stop 248 and cylinder head 249.
tion of the latter and the conical face of the grinding
vAn internal gear segment 251 secured to the piston
Wheel in the other position thereof, and the dresser wheel
rod 241 meshes with a pinion 252 rotatable on a stub
at the opposite limit being positioned to dress the edge
shaft 253 affixed to the cylinder housing 243. Also 50 radius of the grinding wheel in said other position and
meshing vwith the pinion is a rack 254 on the rod of a
the conical face of the grinding wheel in said one position.
piston 255. The latter is reciprocated by alternate appli
3. A machine adapted to support a substantially frusto
cation of hydraulic pressure to chambers 250 and 257 to
conical grinding wheel in either of two positions, with
respectively swing the arm 234 up and down about axis
the wheel axis in one position intersecting the line of
256 of piston rod 241, the limit positions being deter
the wheel axis in the other position, and with the conical
mined by abutment of the piston 255 with cylinder heads
surface of the wheel in said two positions intersecting
25S and 259.
in parallel lines the common plane of the lines of the
The dressing is accomplished by the two wheels W
and 231 being motor driven, at different peripheral
wheel axis in said two positions, the machine supporting
a dresser wheel with its axis in a plane parallel to and
speeds. To begin dressing the wheel stroking mechanism 60 between said lines, means for guiding the dresser wheel
is operated to move the wheel W in direction 31, FIG. 1,
into the same vertical plane as the dressing wheel 231
for motion (a) of its axis substantially in said common
plane and perpendicular to the dresser wheel axis to bring
and the wheel W is raised as a unit with bracket 39 to
the periphery of the wheel to either one of said lines,
dressing position by hydraulic pressure applied through
and for motion (b) approximately in the direction of the
lines 210 and v211, FIG. 5. By application of pressure 65 axis of the dresser wheel to dress the conical surface of
to chamber 257, FIG. 7, the dresser wheel 231 is lowered.
the grinding wheel.
Ratchet wheel 1179, FIG. 3, is advanced one pitch by
4. A machine according to claim 3 in which there are
application of pressure to chamber 174, to feed the Wheel
means to limit the stroke of motion (a) in both direc
downwardly in direction 45, FIGS. 2 and 4; and the
tions, the periphery of the dresser wheel at one limit
dresser wheel 231, in its lower, broken line position in 70 being positioned to dress the ‘grinding wheel in one posi
FIGS. 6 and 7, is shifted to the left in FIGS. 6 and 8
tion of the latter and at the other limit being positioned
by pressure applied to chamber 246, to thereby dress the
to dress the grinding wheel in the other position thereof.
edge radius of the wheel W. This motion is such that
5. A dresser for a grinding wheel comprising a housing
the dresser wheel axis 261 as viewed in FIG. 6 shifts from
having two cylinders with their axes at right angles, a
the right side of the vertical plane through axis 42 to 75 ?rst piston reciprocabie and angular movable in one
3,086,508
5
cylinder, said piston having an arm thereon carrying a
dresser tool, a second piston reciprocable in the second
cylinder, and gearing connecting said pistons to cause
the ?rst piston to be oscillated angularly by and upon
reciprocation of the second piston.
6. A dresser according to claim 5 in which said gearing
comprises a rack carried by the second piston, a pinion
meshing with the rack and supported for rotation in the
housing, and a gear meshing with the pinion and carried
axis for e?ecting said motion (b), and said arm being
movable relative to said housing along said pivot axis
for e?ecting said motion (a).
10. A machine according to claim 9 in which there
is a ?uid actuated piston which carries ‘said arm and is
reciprocable in a cylinder in the housing for effecting
said motion (a), the axis of said cylinder constituting the
pivot axis of the arm, and there is a second ?uid actu
ated piston reciprocable in said housing and connected
10 to the ?rst piston for oscillating it about said pivot axis
for effecting said motion (b).
'
7. A machine having a grinding wheel with a conical
by the ?rst piston.
11. A machine according to claim 10 in which the
connection between the pistons comprises a rack carried
by the second piston, a pinion meshing with the rack
having a cylindrical surface for dressing said conical face
and a surface of decreasing radius and concave pro?le for 15 and supported for rotation 'by the housing, and a gear
meshing ‘with the pinion and carried lby the ?rst piston.
dressing an edge radius on the grinding wheel, means for
guiding the dresser wheel for motion (a) in a radial
References Cited in the ?le of this patent
direction toward and away from said cone element to
dress said edge radius with said surface of concave pro?le
UNITED STATES PATENTS
and return, and for motion (b) approximately in the 20 1,467,985
Schuvr _____________ __ Sept. 11, 1923
face, a dresser wheel whose axis is approximately parallel
to a cone element of said conical face, said dresser wheel
direction of the axis of the dresser wheel to dress said
conical face with said cylindrical surface.
8. A machine according to claim 7 in which said
motion (b) is in an arc tangent to the axis of the dresser
wheel about a pivot axis remote from the dresser wheel 25
and perpendicular to said cone element and to the rota
tion axis of the dresser wheel.
9. A machine according to claim 8 in which the means
for guiding the dresser wheel comprise a housing, an
arm movable angularly on the housing about said pivot
2,067,531
2,086,750
2,171,902
2,323,401
Indge ______________ __ Jan. 12, 1937
.Tanner ______________ __ July 13, 1937
1
Wood ______________ __ Sept. 5, 1939
2,565,013
2,697,426
2,792,672
Johnson _____________ __ July 6,
Bargren ____________ __ Aug. 21,
Price et al. __________ __ Dec. 21,
‘Carlsen et al. ________ __ May 21,
1943
2,826,008
Dunn ______________ __ Mar. 11, 1958
2,963,017
2,972,343
Norel et al. __________ __ Dec. 6, 1960
Dunn ______________ .._ Feb‘. 21, 1961
1951
1954
1957
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