US1883016A - Grinding apparatus - Google Patents

Grinding apparatus Download PDF

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Publication number
US1883016A
US1883016A US388394A US38839429A US1883016A US 1883016 A US1883016 A US 1883016A US 388394 A US388394 A US 388394A US 38839429 A US38839429 A US 38839429A US 1883016 A US1883016 A US 1883016A
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Prior art keywords
cam
shaft
grinding
wheel
plate
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US388394A
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Leo C Shippy
Louis C Goad
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Delco Remy Corp
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Delco Remy Corp
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Priority to US388394A priority Critical patent/US1883016A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/102—Debris chute

Definitions

  • This invention relates to apparatus'for shaping the contour of a body preferably by grinding and is particularly adapted for accurately shaping a rotary plate cam.
  • the present invention provides a novel method and apparatus by which plate cams may be manufactured at relatively low cost.
  • This novel method comprises rotating the cam blank upon its axis while at the same time subjecting its periphery to the action of a grinding wheel which rotates on an axis transverse to the axis of the cam blank and at the same time moving the grinding wheel bodily while rotatin the cam blank.
  • This novel method comprises subjecting the camming periphery of the cam blank to the action of a grinding wheel while the cam is mounted upon a su port providing for rotation of the cam b ank upon its own axis.
  • the grinding wheel is mounted preferably upon an axis transverse to the axis of rotation of the cam blank support and is provided with a plane end surface which engages the blank.
  • Fig. 1 is a full scale fragmentary plan view showing a cam blank and support therefor and two grinding wheels which simultaneousl y shape two camming surfaces.
  • Fig. 2 is a fragmentary cross sectional view taken on the line 22 of Fig. 1. a
  • Fig. 3 is a fragmentary plan view of the machine drawn to a smaller scale than Figs. 1 and 2.
  • Figs. 4 an 5 taken together constitute a longitudinal sectional view taken on the line 4-4 of Fig. 3.
  • Figs. 6 and 7 taken together constitute a cross sectional view taken principally on the line 66 of Fig. 3.
  • Fig. 8 is a cross sectional view taken principally on the line 8-8 of Fig. 3.
  • FIG. 9 is a cross sectional view taken principally on the line 99 of Fig. 3.
  • Fig. 10 is a sectional View ta (en principally on the line 10-10 of Fig. 9.
  • Fig. 11 is a sectional view on the line 11-11 of Fig. 10.
  • Fig. 12 is a sectional view taken principally on the line 12--12 of Fig. 3.
  • Fig. 13 is a sectional view on the line 13-13 of Fig. 17.
  • Figs. 14 and 15 are perspective views of friction clutch members shown in Fig. 17.
  • Fig. 16 is a sectional view on the line 16-16 of Fig. 7 and is drawn to a lar er scale.
  • Fig. 17 is a sectional view ta en principally on the line 17 17 of Fig. 16.
  • the work upon which this machine is particularly ada ted to operate comprises a plate or cam blan 20 havmg camming arms 21 and 21a and attached to a tubular member 22 providing an i nition timer cam 23 of the type usually ound in ignition timers for internal combustion engines.
  • a plate or cam blan 20 havmg camming arms 21 and 21a and attached to a tubular member 22 providing an i nition timer cam 23 of the type usually ound in ignition timers for internal combustion engines.
  • i nition timer cam 23 of the type usually ound in ignition timers for internal combustion engines.
  • One form of such ignition timer is shown in the copending application of C. HrICllldl, Serial Number 80,714 filed January 12, 1926.
  • This application discloses engine speed responsive means for'controlling the angular relation between the ignition timer cam and the engine driven shaft which operates it.
  • This speed responsive means includes weight members which move in response to centrifugal force and cooperate with members corresponding to the plate arm-3 21.
  • each arm 21 be provided with a camming edge surface located between points 24 and 25, the surface being designated by the numeral 26 on arm 21, and 26a on arm 21a.
  • the surf aces 26 and 260. are engaged respectively by the plane end faces 27 and 27a respectively of grinding wheels 28 and 28a. Wheels 28 and 28a are mounted for rotation upon axes ww and y-g respectively.
  • the work or cam blank 20 is mounted to rotate upon its own axis designated ez in Fig. 2 and in a plane common to the axes w-a; and y-y.
  • the grinding wheel 28 is mounted for bodily movement alon its axis w-w and the wheel 28a is mounted for bodily movement along the axis yy. While the blank 20 is moved in a counterclockwise direction so that its arm 21 moves into the position 21' and its arm 21a moves into the position 21'a the grinding wheels 28 and 28a will have moved respectively into the positions 28' and 28'a.
  • the point 24 on the cam contour 26 will first be engaged at point 24' by the end face of grinding wheel 28 which at that time is located in the position indicated by numeral 27 Likewise, the cam contour 26a of arm 21a after having been located in the position 26a will first be engaged at 24'a by the end face of grinding wheel 28a when located in the position 27a. While the blank 20 is being rotated still further in a counterclockwise direction the grinding wheels will be moved bodily along their axes toward their original positlon in such a manner that the point of engagement between each of .the cam contours 26 and 26a will move respectively from the point 24 to the point 25 of cam arm 21 and from the point 24a to the point 25a of cam arm 21a.
  • the rate of axial movement of each grinding wheel away from the axis of rotation of the cam blank is so related to the rate of turning movement of the cam blank that the desired contour of surfaces 26 and 26a will be generated and both the surfaces will bear the same relation to the ignition interrupter cam 23.
  • the cam blank 20 is made to rotate upon its own axis by mounting it upon a pilot rod 30 adapted to fit closely within the tubular part 22 and mounted to rotate upon the axis 2-2 by connecting it coaxially with a shaft 31 also rotatable upon the axis z-2 and journalled within roller bearings 32 and 33 supported by the cross member 34 which connects side frame members 35 and 36 shown more particularly in Figs. 8 and 9. As shown in Figs. p
  • the side frame members 35 and 36 are joined by a left end frame member 37 and by right end frame member 38. These members are closed by cover plates 39 and 40 respectively.
  • the shaft 31 is provided centrally with a taper bore 41 which receives the conical shank 42 of the locating rod 30.
  • the rod 30 is provided with a threaded portion 43 for receiving a suitable tool by which the rod 30 may be removed from the shaft 31.
  • the blank 20 is maintained in the plane common to the axes of the grinding wheels by causing the arms 21 and 21a to rest upon supporting posts 44 and 44a respectively, ex-
  • the cam blank support may be securely connected with the master cam carrying plate 47 in any desired position.
  • the shaft 31 is drivingl connected with the hub 46 of the plate 47 by a key 46a.
  • the shaft 31 is automatically oscillated by a power operated mechanism driven by an electric motor 60 attached by screws 61 to the side frame 35.
  • the shaft 62 of the motor 60 is connected by coupling 63 with a shaft 64 journalled in a bearing 65 carried by a gear housing cover 66.
  • the cover 66 is attached to a gear housing 67 integral with a bracket 68 attached by screws 68a to a cross frame member 69 attached by screws 70 to the frame 35 and by screws 71 tothe frame 36.
  • the shaft 64 Within the gear housing 67 the shaft 64 carries a gear 72 meshing with a gear 73 connected with a shaft 74 journalled in a bearing 75 carried by the gear housing .67.
  • the cross frame 69 provides a ear housing 76, the walls of which provide earings for a shaft 77 which is in alignment with the shaft 74 and is connectible therewith by a suitable clutch 78.
  • the clutch shown is known to machine tool makers as the J ohnson clutch and comprises a driving part 79 attached by pin 80 to the shaft 74 and carrying an expandible band 81 adapted to exand against and grip a shell 82 integral with a hub 83 attached by pin 84 to the shaft 77.
  • the ends of the band 81 are notched at 85 to receive cylindrical bearings 86 provided by levers 87 having wear pieces 88 respectively.
  • the wear pieces 88 bear against each other to provide a fulcrum for the levers 87.
  • the ends 87a of the levers 87 are wedged apart by a pointed wedge block 89 slidablc in a longitudinal groove 90 in the driving part 79 and attached by screw 91 to a shifting sleeve 92 having a groove 93 for receiving lugs 94 provided by the arms 95 of a shifting lever 96 which is keyed to a shaft 97 journallcd in the lugs 98 which extend from the gear housing 67.
  • the shaft 97 carries a lever 99 urged in a counterclockwise direction as viewed in Fig. 7 by spring 100.
  • the shaft 74 is disconnected from the shaft 77
  • the shifting sleeve 92 is moved toward the left as viewed in Fig. 7 by a suitable pedal (not shown) connected by a rod 101 with the lever 99.
  • the lever 99 will move clockwise to cause the sleeve 92 to move toward the left.
  • the wedge block 89 will be moved between the levers 87 to wedgetheir ends 87a apart thereby causing the ends of the band 81 to be separated and the band to be expanded within the shell 82 and to grip the shell and thus cause the shaft 74 to be drivingly connected with the shaft 77.
  • the lever 99 is held in clutch engaging position by a latch mechanism to be described later.
  • the shaft 77 carries a worm 110 meshing with a worm gear 111 keyed at 112 to a shaft 113 journalled in bearings 114 carried by a tubular extension 115 of the gear housing 76.
  • the upper end of the shaft 113 is drivingly connected with a cam plate 116 provided with cam races 117 and 118 as shown in Figs. 8 and 10.
  • ' upper cam race 118 receives a roller 119 journalled on a pin 120 attached to a segment 121 the hub of which is provided with a bearing 122 journalled on a stud 123 integral with a bracket 124 secured by screws 125 to the cross frame member 34.
  • the hub of the segment 121 is retained by a plate 126'secured by a screw 127 to the stud 123.
  • the segment 121 meshes with a gear 128 attached by a key 129 to the lower end of the shaft 31.
  • the cam 118 is rotated in a clockwise direction as viewed in Fig. 10, and in making one complete revolution it causes the segment 121 to make two complete oscillations.
  • That part of the race 118 between the radial lines a-a and bb in Fig. 10 cooperates with the roller 119 in a manner such that the segment 121 will be caused to swing relatively gradually toward the right as viewed in Fig. 10 during the first part of the first oscillation.
  • This movement of segment 121 produces arelatively slow counter-clockwise movement of the cam blank 20 as viewed in Fig. 1.
  • the work done upon the cam blank 20 as described with reference to Figs. 1 and 2 will take place relatively slowly during the first swing of the segment 121 from home position. This swing will be followed by a relatively rapid swing in the opposite direction due to the fact that the cam race 118 is steeper between the radial lines bb and 0-0.
  • the cam.118 is also relatively steep between the radial lines c-c and ddT and between d(l and 0-0. Hence, it is apparcut that the first and relatively gradual swing of the segment 121 will be followed by three relatively rapid swings. Hence, the first abrasion of the work will be relatively slow but will be followed by three relatively rapid passes which provide for finished or smoothing oh the camming edges of the cam plate 20.
  • the race 118 is constructed so that between the radial lines 6-6 and aa there will be no movement of the segment 121.
  • the cam 116 will stop rotating after making one complete revolution. This is accomplished by providing the cam plate 116 with a lug 140 which at the end of the cycle of movement of the cam 118 moves into engagement with a lever 141 pivoted on a rod 142 supported by a bifurcated bracket 143 attached by screws 144 to the cross frame member 69. As the left hand end of the lever 141 moves downwardly the right hand end moves upwardly to engage a lug 145 provided by a lever 146 pivoted on a pin 147 carried by bracket 148 attached by screws 149 to the gear housing 67.
  • a spring 150 attached to the left hand end of the lever 146 urges said lever in a downward direction so that when the lever 141 is not engaged by the lug 140 a stop member 151 provided by the lever 146 will be permitted to engage a latch lever 152 integral with the clutch shifting lever 96. It is, therefore, apparent that the machine is started into operation by moving the rod 101 downwardly as explained before in order to connect the shaft 74 with the shaft 77. The operator holds the rod 101 in downward position until the cam 116 has been rotated sufliciently that its lug 140 will be out of engagement with the lever 141.
  • the cam 48 controls the axial movements of the grinding wheel with relation to the rotary movement of the cam blank 20.
  • the cam 48 controls the axial movements of the grinding wheel with relation to the rotary movement of the cam blank 20.
  • the support and control of the grinding wheel 28 will serve to explain the support and control of the grinding wheel 28a.
  • the parts pertaining to the grinding wheel 28a have been given reference numbers corresponding to similar parts pertaining to the grinding wheel 28 but the letter a is aflixed to reference numerals referring to parts pertaining to the grinding wheel 28a.
  • the frames 35 and 36 support a table 160 attached by screws 161.
  • the table 160 supports a spindle frame carriage guide bracket 162 secured by screws 163 and providing in conjunction with a gib 164 parallel ways which receive the dove-tail shaped extension 165 of a spindle frame carriage 166 to which screws 167 secure a spindle frame 168 having a split cylindrical portion 169 which may be clamped around the spindle bearing 170 providing a journal for a spindle 171 which supports and drives the wheel 28.
  • the bracket 168 includes a second split cylindrical portion 173 which by tightening a clamping screw 174 will retain a bearing 175 for the right hand end of the spindle 171.
  • Spindle 171 carries a pulley 17 6 located between the cylindrical portions 169 and 173 of the frame 168.
  • the pulley 176 is driven by a belt 177 which passes around a pulley 178 driven by an electric motor 179 mounted upon the frame 36.
  • the carriage 166 provides a nut portion 180 which receives a screw 181 provided by a rod 182 journalled in a bearing 183 provided by a bracket 184 attached by screws 185 to the table 160.
  • the rod 182 may be operated manually by hand wheel 186.
  • the left hand end portion 187 of the rod 182 bears against a cam following slide 188 engaging the cam 48.
  • the slide 188 is guided by parallel ways provided by a bracket 189 and a gib 190 held down upon the bracket by screws 191 and adjusted laterally by screws 192 passing horizontally through the bracket 189.
  • Bracket 189 is secured to the table 160 by screws 193.
  • the carriage 166 is urged toward the cam 48 by a spring 194 located between the carriage and the bracket 184.
  • This spring 194 maintains the rod 187 in engage-- ment with the follower 188 and the follower 188 in engagement with the cam 48.
  • the cam 48 is provided with a surface so located as to maintain the wheel 28 as indicated in full lines in Fig. 1.
  • its beveled surface 48b will permit a movement of the follower 188 rapidly toward the axis of the cam 48 thus permitting the grinding edge 27 of the wheel 28 to move to the dot and dash line po ition 27 shown in Fig. 1.
  • the cam 48 is so shaped that during further counterclockwise rotation of the cam the grinding wheel edge will move gradually from the position indicated at 27 in Fig. 1 toward the full line position 27 in order that the desired cam contour 26 will be generated upon the blank 20.
  • the wheel 28 is dressed off by a diamond 1190 mounted in a suitable holder 1191 detachably secured, to a frame 1192 which has a clamping hub 1193 by which the frame is clamped to a.
  • shaft 1194 mounted in brackets 195 and 196 which are integral with the cross frame 34.
  • the shaft 1194 is also journalled in a bracket 197 attached to the frame 36.
  • the frame 1192 is provided with a lever 198 connected by a pin 199 with a bifurcated pivot member 200 connected by pin 201 with a clevis 202 attached by a rod 203 with a clevis 204 connected by a pin 205 with a lever 206 which is, attached to the upper end of a shaft 207 extending vertically through the bottom of the cross frame 34 and journalled in a bearmg bracket 208 attached by screws 209 to member 34.
  • the lower end of the shaft 207 is connected by a key 210 to a lever 211 comprising horizontal portions 212 and 213 and an intermediate portion 214 which permits the lever to straddle the cam plate 116.
  • lever portion 213 carries a screw pin 215 providing a journal for a roller 216 which is received by the cam race 117.
  • the race 117 is so shaped between the radial lines ce and aa that, while the segment 121 and hence the work is at rest, the lever 211 will be given one complete oscillation which will cause the frame 1192 to oscillate and cause the diamond 1190 to move over the face 27 of the grinding wheel 28.
  • the grinding wheel 28 is provided with a cover 220 which is automatically removed from position shown in the drawings while the diamond 1190 is dressing the wheel 28.
  • the cover 220 is mounted upon a lever arm 221 pivotally connected by pivot screw 222 with a bracket 223 attached by screws 224 to a flange 225 of the table 160.
  • the lever 221 is connected by a rod 226 with a lever 227 connected with the shaft 1194. It is, therefore, apparent that as the frame 1192 swings toward the grinding wheel 28 the cover 220 will be moved away from the face of the grinding wheel so as to permit the diamond to move without interference by the cover.
  • the rod 182 which carries the carriage feed screw 181 is provided with a slot 230 which receives a pin 231 connected with the hub 232 of a ratchet
  • the ratchet 233 is engaged by pawls 234 each nivotally supported upon a pivot screw 235 threaded into a pawl supporting arm 236 having a hub 237 loosely journalled upon the hub 232 of the ratchet 233.
  • Each pawl 234 is urged against the ratchet 233 by a spring 238 having one end connected with the pawl 234 and the other with a spring post 239 attached to the pawl lever 236.
  • the lever 236 is urged in a counterclockwise direction by spring 240 retained within a recess 241 pro vided by a bracket 242 attached by screws 243 to the table 160.
  • One end of the spring 240 bears against a screw 244 threaded into the bracket 242 and the other end of the spring bears against a plunger 245 which engages the lever 236.
  • Lever 236 is moved in a clockwise direction as viewed in Fig. 16 by rod 250 guided by a bracket 251 secured-by a screw 252 to the bracket 162.
  • the rod 250 Adjacent its right hand end the rod 250 is provided with a recess 253 for receiving the cylindrical end 254 of a lever 255 which is integral with a friction clutch member 256 loosely mounted on the shaft 1194 and urged by a spring 257 against a friction disc 258 (see Figs. 13 and 15).
  • the disc 258 is provided centrally with notches 259 by which it is is drivingly connected with lugs 260 extending from the plate 261 drivingly connected with the shaft 1194.
  • the spring 257 is maintained in a state of compression by nuts 262 engaging the threaded extension 263 of the shaft 1194.
  • the lever 255 will oscillate but only to the extent determined by two set screws 270 and 271 which respectively limit the upward and downward movements of a lever 272 integral with the clutch memher 256.
  • the upper side of lever 272 is engaged by the lower end of screw 27 0 and the lower side of the bifurcated extension of lever 272 is engaged by a shoulder 273 provided by the screw 271.
  • the screws 27 0 and 271 are threadedly connected with the table 160. By adjusting these screws the extent of travel of the rod 250 may be varied in order to vary the travel of the ratchet 233 and hence of the screw 181 which controls the position of the grinding wheel spindle carriage 166 along the table 160.
  • the carriage 166 is fed automatically onlyin a direction toward the work. When it is desired to retract the carriage 166 this is accomplished by turning the hand wheel 186. In order to permit turning the hand wheel in a direction to retract the carriage 166 the )tLWlS 234 must be disengaged from the ratchet 233. This is accomplished by moving a handle 280 toward the spindle carriage 166 as seen in Fig. 16.
  • the handle 280 is connected with an L-shaped rod 281 which is slidably guided by the bracket 251 and has an end portion 282 adapted to engage the pawl 234 nearest to it and to thereby cause this pawl to move the other pawls 234 away from the ratchet 233.
  • the rod 281 is maintained in the position shown in Fig. 16 by spring 283 and is retained in position for disengaging the pawls from the ratchet by a spring clip 284 shown in Figs. 16' and 3, said clip being attached by screws 285 to the bracket 162 which is provided with a slot 286 through which the rod 281 extends.
  • the handle 280 is used particularly when the grinding wheels are replaced. As the wheels are worn away their thickness decreases requiring them to be automatically fed toward the work. When the wheels have been worn away to such an extent that they can no longer be used it is necessary to replace them with new wheels. This necessitates locating the wheel spindle carriages at distances more remote from the work. As stated before in order to accomplish this by rotating the hand wheels 186 it is necessary to move the handle 280 toward the work carriage 166 so that the ratchet 233 will turn free of the pawls 234.
  • the cross frame 34 supports brackets 290 one of which is shown in Fig. 8 which support a splash guard 291 which catches the liquid directed upon the grinding wheels for lubricating and cooling the same.
  • the nozzles for directing the lubricant upon the work are not shown as they form no part of the present invention.
  • the guard 291 provides an annular flange 292 (see Fig. 2) surrounding a central orifice through which the grinding liquid may pass to an annular groove 293 provided by the cam supporting plate 47.
  • Tubes 294 direct the liquid into an annular chamber 295 providcd by the frame 34, said chamber being connected with a drain pipe 296.
  • Grinding apparatus for shaping the contour of fiat plates comprising, in combination, a work-ho1der supportin a flat plate for rotation on an axis at rig t angles to its plane; a grinding wheel having a plane surface for grinding the contour of the plate, said wheel rotating on an axis arallel to the plane of the plate; and means "or concurrently rotating the work-holder and bodily moving the wheel.
  • Grinding apparatus for shaping the contour of flat plates comprising, in combination, a work-holder supporting a fiat plate for rotation on an axis at right angles to its lane; a grinding wheel having a plane sur .ace for grinding the contour of the plate, said wheel rotating on an axis arallel to the plane of the plate; and means or concurrently rotating the work-holder and axially moving the wheel.
  • Apparatus according to claim 2 having means for automatically sto pin rotation of the support atter one eye e 0 movement thereof.
  • Apparatus according to claim 2 having means for automatically stopping rotation of the support after one cycle of movement thereof and means for automatically dressing and feeding the grinding wheel.
  • Apparatus according to claim 2 having means for automatically dressing the grinding wheel between grinding operations and feeding the wheel to compensate for the grinding material removed.
  • ⁇ means for oscillating the shaft while the wheel engages the plate.
  • Grinding apparatus for shaping the contour of cams comprising, a rotatable cam blank support, a grinding wheel rotatable on an axis transverse to the axis of the support, and cam means for automatically rotating the support and concurrently moving the grinding wheel bodily while the wheel engages the blank.
  • Grinding apparatus for shaping the contour ct cams comprising, a rotatable cam blank support, a grinding wheel rotatable on an axis transverse to the axis of the support, and a plurality of cams for automatically rotating the support and concurrently moving the grinding wheel bodily while the wheel engages the blank.
  • Grinding apparatus for shaping the contour of cams comprising a rotatable cam blank support, a plurality oi grinding wheels rotatable on axes transverse to the axis of the support, a cam for rotating said support and another cam for concurrently moving the grinding wheels bodily while said wheels engage the cam blank.
  • Grinding apparatus for shaping the contour of cams comprising, a rotatable cam blank support, a plurality of grinding wheels rotatable on axes transverse to the axis of the support, means for rotating said support, and
  • a cam on said support for concurrently moving said grinding wheels axially at a predetermined rate relative to the speed of rotation of the support while the wheel engages the cam blank.
  • Grinding apparatus for shaping the contour of cams comprising, a rotatable cam blank support, a plurality of grindin wheels rotatable on axes transverse to the axis of the support, a cam for automatically rotating said support and another cam for simultaneously moving all of said grinding wheels axially at a predetermined rate relative to the speed of rotation of the support while the wheel engages the cam blank.
  • Grinding apparatus for shaping the contour of cams comprising an oscillatable cam blank support, a grinding wheel rotatable on an axis transverse to the axis of the support, and means for oscillating the support and concurrently reciprocating the grinding wheel on its axis while the wheel engages the cam blank, said means comprising a plurality of cams.
  • Grinding apparatus for shaping the contour of cams comprising, an oscillatable cam blank support, a grinding wheel rotatable on an axis transverse to the axis of the support, a plurality of cams for oscillating the support and concurrently reciprocating the grinding wheel on its axis while the Wheel engages the cam blank, said cams being so designed that a plurality of oscillations of the cam blank and reciprocations of the grinding wheel are efiected during the cycle of operation of the cams.
  • cams comprising, an oscillatable cam blank support, a grinding wheel rotatable on an axis transverse to the axis of the support, a plurality of cams for oscillating the support and concurrently reciprocating the grinding wheel on its axis a plurality of times during one cycle of operation of the cams and while the wheel engages the cam blank, said cams being so designed that a relatively slow movement of the cam blank support and grinding wheel is followed by a relatively rapid movement thereof.
  • cam follower connected with the grinding wheel frame and cooperating with the cam; means for oscillating the shaft while the Wheel engages the plate; and means for automatically 7 parallel to the plane of the plate and having a plane grinding surface engaging the edge of the plate; a grinding wheel frame guided for bodily movement axially of the wheel, a master cam carried by said shaft; a cam follower connected With the grinding wheel frame and cooperating with the cam; means for oscillating the shaft While the wheel engages the pl-ate; means for automatically stopping rotation of the work support after one cycle of movement thereof and means for automatically dressing the grinding wheel between grinding operations and feeding the wheel to compensate for the grinding material removed.
  • a grinding apparatus the combination of a grinding wheel; a dresser; a wheel guard; means for moving the dresser against the wheel for removing the guard from the path of the dresser.
  • a grinding apparatus the combination of a grinding wheel; a dresser; a wheel guard; means effecting relative. movement between the grinding wheel and the dresser and for removing the guard from the point of en gagement of the dresser with the grinding wheel.
  • a grinding apparatus the combination of a grinding wheel; a shaft; a dresser pivotally mounted on the shaft; a movable wheel guard; driving connections between the wheel guard and the shaft; and means for rocking said shaft so as to move the dresser toward and past the wheel and causing the wheel guard to remove from the path of the dresser through the said driving connect-ions.
  • a grinding apparatus the combination of a work support; a shaft rotating the work support; a cam on said shaft; a rotary grinding wheel; a bodily movable frame supporting said wheel; a cam follower cooperating with said'cam and adjustahly connected to the frame; cam operated means for operating the cam shaft; and asecond cam operated means for adjusting the frame with respect to the cam follower.
  • cam on said shaft a rotary grinding wheel; a bodily movable frame supporting said wheel; a cam follower cooperating with the said cam and adjustably connected to the frame; cam operated means for operating the cam shaft; and a second cam operated means for adjusting the frame with respect to the cam follower.
  • a grinding apparatus the combination of a shaft; a work support on the shaft; a master cam on the shaft; a rotary grinding wheel; a bodily movable frame supporting said wheel; a master cam follower adjustably connnected to the frame cam operated means for operating the master cam shaft; a dresser for the grinding wheel and a second cam operated means for adjusting the frame with respect to the mastercam follower and for operating the dresser.
  • a grinding apparatus the combination of a shaft; a work support on the shaft; a master cam on the shaft; a rotary grinding wheel; a. bodily movable frame supporting said wheel; a master cam follower adjustably connected to the frame; cam operated means for operating the master cam shaft; a dresser for the grinding wheel surface; a movable wheel guard; and a second cam operated means for adjusting the frame with respect to the master cam follower and for operating the dresser and removing the guard from the path of the dresser.
  • a grinding apparatus the combina tion of a shaft; a work support on the shaft; a master cam on the shaft; a rotary grinding Wheel; a bodily movable frame supporting said wheel; a master cam follower adjustably connected to the frame; a second shaft coaxial with the master cam shaft; cam operated means on the second shaft for operating the master cam shaft; :1 dresser for the grinding wheel surface; means for adjusting the frame with respect to the master cam follower; a third shaft transverse to the master i cam shaft operating the dresser and the last said means; and another cam operated means on the second shaft for actuating the third shaft.
  • a grinding apparatus the combination of a shaft; a work support on the shaft; a master cam on the shaft; a rotary grinding wheel; a bodily movable frame supporting said wheel; a master cam follower adjustably connected to the frame a second shaft coaxial with the master cam shaft; cam operated means on the second shaft for operating the master cam shaft; a dresser for the grind ing wheel surface; a movable wheel guard; means for adjusting the frame with respect to the master cam follower; a third shaft transverse to the master cam shaft operating the dresser and the last said means and removing the wheel guard from the path of the dresser; and another cam operated means on the second shaft for actuating the third shaft.
  • a support for supporting a workpiece a grinding wheel; a movable frame carrying the grinding wheel a master cam controlling the movement of the frame; a shaft; means on said shaft for bodily moving the minding wheel frame relative to the master cam in response to rotation of the shaft; a hand wheel on said shaft for manually turning the same; ratchet mechanism tor turning the shaft between grinding operations; said ratchet mechanism normally resisting rotation of the shaft in one direction b the hand wheel; and means for disabling t e ratchet mechanism.
  • a support for supporting a workpiece a grinding wheel
  • a movable frame can ing the grinding wheel
  • a master cam contro ling the movement of the frame
  • a shaft means on said shaft for bodily moving the grinding wheel frame relative to the master cam in response to rotation of the shaft; a hand wheel on said shaft for manually turning the same;
  • a member having an overtravel for operating the ratchet mechanism; yielding means for imparting motion of the member to' the ratchet mechanism and at least one adjustable stop for varying the movement imparted by the yielding means to the ratchet mechanism.
  • a support for supporting a workpiece a grinding wheel; a movable frame carrying the grinding wheel; a master cam controlling the movement of the frame; a shaft; means on said shaft for bodily moving the grinding wheel frame relative to the master cam in response to rotation of the shaft; a hand wheel on said shaft for manually turning the same; a member having an overtravel for operating the ratchet mechanism; a friction disc imparting motion of the member to the ratchet means; and at least one adjustable stop for varying the movement of the friction disc.
  • a grinding apparatus for grinding opposite edges of a plate the combination of a work support pivotally supporting a plate at an intermediate point; grinding wheels operatin "with their plane surface on op- 'oosite edges of the plate; a master cam for bodily moving the grinding wheels while they engage the edges of the plate; and another cam for moving the plate about an intermediate point and controlling move- 1 meat of the master cam.
  • a grinding apparatus for grinding opposite edges of a plate the combination of worl: support pivotally supporting a plate at an intermediate point; grinding .heels operatin with their plans surface on opposite e ges of the plate; a master cam for axially moving the grinding wheels while the same engage the edges of the plate; and another cam for moving the plate about an intermediate point and controlling movement of the master came 37.
  • a; grinding apparatus for grinding opposite edges of a plate the combination of a worlr support pivotally supporting a plate at an intermediate point; grindin wheels simultaneously operating with their plane S111- face engaging opposite edges of the plate; a shaft; a. master cam for anially moving the grindin wheels while the same engage-the edges 0 the plate; and another cam for moving the late about an intermediate point and controlling movement of the master cam.
  • a grinding apparatus for grinding opposite edges of a late on opposite sides of its center, the com ination of a work support for supporting a plate for rotation about an axis normal to the plane of the plate; grinding wheels operating with their plane surface on opposite edges of the plate and lilon opposite sides of the center thereof; a
  • a grinding apparatus for grinding opposite edges of a. plate on opposite sides of its center the combination of a work support for supporting a, plate for rotation about an 10 axis normal to the plane of the plate; grinding wheels operating with their plane surface on opposite edges of the plate and on opposite sides of the center thereof; a master cam rotating coaxially with the support; and means 15 cooperating with the cam for axially moving the grinding wheels while they engage the edges of the plate.

Description

Oct. 18, 1932- c. SHIPPY ET AL 1,883,016
GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 1 Oct. 18, 1932. c. SHIPPY ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 2 gwuemto'ut attouwqx Ju m Oct. 18, 1932. L. c. SHIPPY ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 3 N w g glwwmom.
1932- L. c. SHIPPY ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 4 Oct. '18, 1932. c. SHIPPY ETAL GRINDING APPARATUS Filed Aug. 26, 1929' 11 Sheets-Sheet 5 c'lmmmm.
Oct. 18, 1932. c. SHIPPY ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 6 Oct. 18, 1932; L. c. SHlPPY ETAL GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 7 I glwoe'ntou I Z5? Oct. 18, L c. S P ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 8 Oct. 18, 1932. L. c. SHIPPY ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 9 Oct. 18, 1932. CQSHIPPY ET AL GRINDING APPARATUS Filed Aug. 26, 1929 11 Sheets-Sheet 10 2,] nvwn low Oct. 18, 1932. c. SHIPPY ET AL GRINDING APPARATUS 1'1 Sheets-Sheet 11 Filed Aug. 26, 1929 Patented Oct. 18, 1932 UNITED STATES PATENT OFFICE LEO C. SHIPPY, OF ANDERSON, AND LOUIS C. GOAD, F MUNCIE, INDIANA, ASSIGNORS TO DELCO-REMY CORPORATION, OF ANDERSON, INDIANA, A CORPORATION OF DELAWARE GRINDING APPARATUS Application filed August 26, 1929. SerialNo. 388,894.
This invention relates to apparatus'for shaping the contour of a body preferably by grinding and is particularly adapted for accurately shaping a rotary plate cam.
The present invention provides a novel method and apparatus by which plate cams may be manufactured at relatively low cost. This novel method comprises rotating the cam blank upon its axis while at the same time subjecting its periphery to the action of a grinding wheel which rotates on an axis transverse to the axis of the cam blank and at the same time moving the grinding wheel bodily while rotatin the cam blank. This novel method comprises subjecting the camming periphery of the cam blank to the action of a grinding wheel while the cam is mounted upon a su port providing for rotation of the cam b ank upon its own axis. While the grindin wheel is operating upon the periphery of t e blank the blank is rotated and at the same time the wheel is bodily moved in a manner such that the desired periphery or contour will be generated. The grinding wheel is mounted preferably upon an axis transverse to the axis of rotation of the cam blank support and is provided with a plane end surface which engages the blank.
Further objects and advantages of the present invention will be apparent from the accompanying drawings whlch show a machine embodying the present invention and adapted particularly for forming the desired contour on a plate cam used in mechanism for automatically controlling in accordance with speed, the ignition timer of an internal combustion engine.
In the drawings:
Fig. 1 is a full scale fragmentary plan view showing a cam blank and support therefor and two grinding wheels which simultaneousl y shape two camming surfaces.
Fig. 2 is a fragmentary cross sectional view taken on the line 22 of Fig. 1. a
Fig. 3 is a fragmentary plan view of the machine drawn to a smaller scale than Figs. 1 and 2.
Figs. 4 an 5 taken together constitute a longitudinal sectional view taken on the line 4-4 of Fig. 3.
Figs. 6 and 7 taken together constitute a cross sectional view taken principally on the line 66 of Fig. 3.
Fig. 8 is a cross sectional view taken principally on the line 8-8 of Fig. 3.
-Fig. 9 is a cross sectional view taken principally on the line 99 of Fig. 3.
Fig. 10 is a sectional View ta (en principally on the line 10-10 of Fig. 9.
Fig. 11 is a sectional view on the line 11-11 of Fig. 10.
Fig. 12 is a sectional view taken principally on the line 12--12 of Fig. 3.
Fig. 13 is a sectional view on the line 13-13 of Fig. 17.
Figs. 14 and 15 are perspective views of friction clutch members shown in Fig. 17.
Fig. 16 is a sectional view on the line 16-16 of Fig. 7 and is drawn to a lar er scale.
Fig. 17 is a sectional view ta en principally on the line 17 17 of Fig. 16.
Referring to Figs. 1 and 2 the work upon which this machine is particularly ada ted to operate comprises a plate or cam blan 20 havmg camming arms 21 and 21a and attached to a tubular member 22 providing an i nition timer cam 23 of the type usually ound in ignition timers for internal combustion engines. One form of such ignition timer is shown in the copending application of C. HrICllldl, Serial Number 80,714 filed January 12, 1926.
This application discloses engine speed responsive means for'controlling the angular relation between the ignition timer cam and the engine driven shaft which operates it. This speed responsive means includes weight members which move in response to centrifugal force and cooperate with members corresponding to the plate arm-3 21. For purposes of understanding the present invention it is sufiicient to say that it is desirable that each arm 21 be provided with a camming edge surface located between points 24 and 25, the surface being designated by the numeral 26 on arm 21, and 26a on arm 21a. The surf aces 26 and 260. are engaged respectively by the plane end faces 27 and 27a respectively of grinding wheels 28 and 28a. Wheels 28 and 28a are mounted for rotation upon axes ww and y-g respectively. The work or cam blank 20 is mounted to rotate upon its own axis designated ez in Fig. 2 and in a plane common to the axes w-a; and y-y. The grinding wheel 28 is mounted for bodily movement alon its axis w-w and the wheel 28a is mounted for bodily movement along the axis yy. While the blank 20 is moved in a counterclockwise direction so that its arm 21 moves into the position 21' and its arm 21a moves into the position 21'a the grinding wheels 28 and 28a will have moved respectively into the positions 28' and 28'a. The point 24 on the cam contour 26 will first be engaged at point 24' by the end face of grinding wheel 28 which at that time is located in the position indicated by numeral 27 Likewise, the cam contour 26a of arm 21a after having been located in the position 26a will first be engaged at 24'a by the end face of grinding wheel 28a when located in the position 27a. While the blank 20 is being rotated still further in a counterclockwise direction the grinding wheels will be moved bodily along their axes toward their original positlon in such a manner that the point of engagement between each of .the cam contours 26 and 26a will move respectively from the point 24 to the point 25 of cam arm 21 and from the point 24a to the point 25a of cam arm 21a. The rate of axial movement of each grinding wheel away from the axis of rotation of the cam blank is so related to the rate of turning movement of the cam blank that the desired contour of surfaces 26 and 26a will be generated and both the surfaces will bear the same relation to the ignition interrupter cam 23.
The cam blank 20 is made to rotate upon its own axis by mounting it upon a pilot rod 30 adapted to fit closely within the tubular part 22 and mounted to rotate upon the axis 2-2 by connecting it coaxially with a shaft 31 also rotatable upon the axis z-2 and journalled within roller bearings 32 and 33 supported by the cross member 34 which connects side frame members 35 and 36 shown more particularly in Figs. 8 and 9. As shown in Figs. p
4 and 5 and 6 and 7 the side frame members 35 and 36 are joined by a left end frame member 37 and by right end frame member 38. These members are closed by cover plates 39 and 40 respectively. The shaft 31 is provided centrally with a taper bore 41 which receives the conical shank 42 of the locating rod 30. The rod 30 is provided with a threaded portion 43 for receiving a suitable tool by which the rod 30 may be removed from the shaft 31.
The blank 20 is maintained in the plane common to the axes of the grinding wheels by causing the arms 21 and 21a to rest upon supporting posts 44 and 44a respectively, ex-
tending from an inverted cup-shaped hub 45 which fits with a tubular hub 46 of a circular plate 47 to which a master cam 48 is secured by screws 49. Each of the posts 44 or 44a is provided with a recess 44' or 44'a which receives a portion of arms 21 and 21a respectively. Hence, the blank 20 is prevented from rotatin clockwise while being engaged by the grinding wheels. As explained later the cam 48 controls the axial movements of the grinding wheels with relation to the rotary movements of the cam blank 20. Hence, it is necessary that the cam blanks support be adjustably secured to the plate 47 carrying the master cam 48. To provide for such adjustment the hub 45 is split at 50 shown in Figs. 2 and 3 and one portion of the hub is provided with a plane hole for receiving a cap screw 51 which is threaded at 52 into the other portion of the hub 45. Hence, by tightening the screw the cam blank support may be securely connected with the master cam carrying plate 47 in any desired position. The shaft 31 is drivingl connected with the hub 46 of the plate 47 by a key 46a.
The shaft 31 is automatically oscillated by a power operated mechanism driven by an electric motor 60 attached by screws 61 to the side frame 35. The shaft 62 of the motor 60 is connected by coupling 63 with a shaft 64 journalled in a bearing 65 carried by a gear housing cover 66. The cover 66 is attached to a gear housing 67 integral with a bracket 68 attached by screws 68a to a cross frame member 69 attached by screws 70 to the frame 35 and by screws 71 tothe frame 36. Within the gear housing 67 the shaft 64 carries a gear 72 meshing with a gear 73 connected with a shaft 74 journalled in a bearing 75 carried by the gear housing .67. The cross frame 69 provides a ear housing 76, the walls of which provide earings for a shaft 77 which is in alignment with the shaft 74 and is connectible therewith by a suitable clutch 78. The clutch shown is known to machine tool makers as the J ohnson clutch and comprises a driving part 79 attached by pin 80 to the shaft 74 and carrying an expandible band 81 adapted to exand against and grip a shell 82 integral with a hub 83 attached by pin 84 to the shaft 77. The ends of the band 81 are notched at 85 to receive cylindrical bearings 86 provided by levers 87 having wear pieces 88 respectively. The wear pieces 88 bear against each other to provide a fulcrum for the levers 87. The ends 87a of the levers 87 are wedged apart by a pointed wedge block 89 slidablc in a longitudinal groove 90 in the driving part 79 and attached by screw 91 to a shifting sleeve 92 having a groove 93 for receiving lugs 94 provided by the arms 95 of a shifting lever 96 which is keyed to a shaft 97 journallcd in the lugs 98 which extend from the gear housing 67. The shaft 97 carries a lever 99 urged in a counterclockwise direction as viewed in Fig. 7 by spring 100. When the lever 99 is in the position shown in Fig. 7 the shaft 74 is disconnected from the shaft 77 To connect the shaft 74 with the shaft 77 the shifting sleeve 92 is moved toward the left as viewed in Fig. 7 by a suitable pedal (not shown) connected by a rod 101 with the lever 99. When the rod 101 is moved downwardly by the pedal the lever 99 will move clockwise to cause the sleeve 92 to move toward the left. When this occurs the wedge block 89 will be moved between the levers 87 to wedgetheir ends 87a apart thereby causing the ends of the band 81 to be separated and the band to be expanded within the shell 82 and to grip the shell and thus cause the shaft 74 to be drivingly connected with the shaft 77. The lever 99 is held in clutch engaging position by a latch mechanism to be described later.
Within the gear housing 76 provided by the cross frame member 69, the shaft 77 carries a worm 110 meshing with a worm gear 111 keyed at 112 to a shaft 113 journalled in bearings 114 carried by a tubular extension 115 of the gear housing 76. The upper end of the shaft 113 is drivingly connected with a cam plate 116 provided with cam races 117 and 118 as shown in Figs. 8 and 10. The
' upper cam race 118 receives a roller 119 journalled on a pin 120 attached to a segment 121 the hub of which is provided with a bearing 122 journalled on a stud 123 integral with a bracket 124 secured by screws 125 to the cross frame member 34. The hub of the segment 121 is retained by a plate 126'secured by a screw 127 to the stud 123. The segment 121 meshes with a gear 128 attached by a key 129 to the lower end of the shaft 31. The cam 118 is rotated in a clockwise direction as viewed in Fig. 10, and in making one complete revolution it causes the segment 121 to make two complete oscillations. That part of the race 118 between the radial lines a-a and bb in Fig. 10 cooperates with the roller 119 in a manner such that the segment 121 will be caused to swing relatively gradually toward the right as viewed in Fig. 10 during the first part of the first oscillation. This movement of segment 121 produces arelatively slow counter-clockwise movement of the cam blank 20 as viewed in Fig. 1. Hence, the work done upon the cam blank 20 as described with reference to Figs. 1 and 2 will take place relatively slowly during the first swing of the segment 121 from home position. This swing will be followed by a relatively rapid swing in the opposite direction due to the fact that the cam race 118 is steeper between the radial lines bb and 0-0. The cam.118 is also relatively steep between the radial lines c-c and ddT and between d(l and 0-0. Hence, it is apparcut that the first and relatively gradual swing of the segment 121 will be followed by three relatively rapid swings. Hence, the first abrasion of the work will be relatively slow but will be followed by three relatively rapid passes which provide for finished or smoothing oh the camming edges of the cam plate 20. For a purpose to be described,'the race 118 is constructed so that between the radial lines 6-6 and aa there will be no movement of the segment 121.
The cam 116 will stop rotating after making one complete revolution. This is accomplished by providing the cam plate 116 with a lug 140 which at the end of the cycle of movement of the cam 118 moves into engagement with a lever 141 pivoted on a rod 142 supported by a bifurcated bracket 143 attached by screws 144 to the cross frame member 69. As the left hand end of the lever 141 moves downwardly the right hand end moves upwardly to engage a lug 145 provided by a lever 146 pivoted on a pin 147 carried by bracket 148 attached by screws 149 to the gear housing 67. A spring 150 attached to the left hand end of the lever 146 urges said lever in a downward direction so that when the lever 141 is not engaged by the lug 140 a stop member 151 provided by the lever 146 will be permitted to engage a latch lever 152 integral with the clutch shifting lever 96. It is, therefore, apparent that the machine is started into operation by moving the rod 101 downwardly as explained before in order to connect the shaft 74 with the shaft 77. The operator holds the rod 101 in downward position until the cam 116 has been rotated sufliciently that its lug 140 will be out of engagement with the lever 141. When this occurs the spring150 will be permitted to move the lever 146 into such position that the stop 151 will engage the latch lever 152 and hold it in such position that the clutch will remain engaged so that the operator may release the pedal which was used to move the rod 101 downwardly. Obviously, after the cam 116 has made one complete revolution the lug 140 will engage the lever 141 causing it to move counterclockwise as viewed in Fig. 7' thereby causing the lever 146 to move clockwise and its stop 151 to be moved away from the lever 152 whereupon the spring 100 is permitted to inove the lever 99 counterclockwise and to cause the clutch to be disengaged as stated before.
It has been stated that the cam 48 controls the axial movements of the grinding wheel with relation to the rotary movement of the cam blank 20. As each of the grinding Wheels 28 and 28a is supported and controlled in the same manner, one description of the support and control of the grinding wheel 28 will serve to explain the support and control of the grinding wheel 28a. The parts pertaining to the grinding wheel 28a have been given reference numbers corresponding to similar parts pertaining to the grinding wheel 28 but the letter a is aflixed to reference numerals referring to parts pertaining to the grinding wheel 28a.
The frames 35 and 36 support a table 160 attached by screws 161. The table 160 supports a spindle frame carriage guide bracket 162 secured by screws 163 and providing in conjunction with a gib 164 parallel ways which receive the dove-tail shaped extension 165 of a spindle frame carriage 166 to which screws 167 secure a spindle frame 168 having a split cylindrical portion 169 which may be clamped around the spindle bearing 170 providing a journal for a spindle 171 which supports and drives the wheel 28. By tightening clamping screws 172 the bearing 170 is secured to the frame 169. The bracket 168 includes a second split cylindrical portion 173 which by tightening a clamping screw 174 will retain a bearing 175 for the right hand end of the spindle 171. Spindle 171 carries a pulley 17 6 located between the cylindrical portions 169 and 173 of the frame 168. The pulley 176 is driven by a belt 177 which passes around a pulley 178 driven by an electric motor 179 mounted upon the frame 36.
As seen in Fig. 5 the carriage 166 provides a nut portion 180 which receives a screw 181 provided by a rod 182 journalled in a bearing 183 provided by a bracket 184 attached by screws 185 to the table 160. The rod 182 may be operated manually by hand wheel 186. The left hand end portion 187 of the rod 182 bears against a cam following slide 188 engaging the cam 48. The slide 188 is guided by parallel ways provided by a bracket 189 and a gib 190 held down upon the bracket by screws 191 and adjusted laterally by screws 192 passing horizontally through the bracket 189. Bracket 189 is secured to the table 160 by screws 193. The carriage 166 is urged toward the cam 48 by a spring 194 located between the carriage and the bracket 184. This spring 194 maintains the rod 187 in engage-- ment with the follower 188 and the follower 188 in engagement with the cam 48. At 480 the cam 48 is provided with a surface so located as to maintain the wheel 28 as indicated in full lines in Fig. 1. As the cam 48 is turned in a counterclockwise direction its beveled surface 48b will permit a movement of the follower 188 rapidly toward the axis of the cam 48 thus permitting the grinding edge 27 of the wheel 28 to move to the dot and dash line po ition 27 shown in Fig. 1. Between the points 480 and 48/1 the cam 48 is so shaped that during further counterclockwise rotation of the cam the grinding wheel edge will move gradually from the position indicated at 27 in Fig. 1 toward the full line position 27 in order that the desired cam contour 26 will be generated upon the blank 20.
After each grinding operation the wheel 28 is dressed off by a diamond 1190 mounted in a suitable holder 1191 detachably secured, to a frame 1192 which has a clamping hub 1193 by which the frame is clamped to a. shaft 1194 mounted in brackets 195 and 196 which are integral with the cross frame 34. The shaft 1194 is also journalled in a bracket 197 attached to the frame 36. The frame 1192 is provided with a lever 198 connected by a pin 199 with a bifurcated pivot member 200 connected by pin 201 with a clevis 202 attached by a rod 203 with a clevis 204 connected by a pin 205 with a lever 206 which is, attached to the upper end of a shaft 207 extending vertically through the bottom of the cross frame 34 and journalled in a bearmg bracket 208 attached by screws 209 to member 34. The lower end of the shaft 207 is connected by a key 210 to a lever 211 comprising horizontal portions 212 and 213 and an intermediate portion 214 which permits the lever to straddle the cam plate 116. The
lever portion 213 carries a screw pin 215 providing a journal for a roller 216 which is received by the cam race 117. The race 117 is so shaped between the radial lines ce and aa that, while the segment 121 and hence the work is at rest, the lever 211 will be given one complete oscillation which will cause the frame 1192 to oscillate and cause the diamond 1190 to move over the face 27 of the grinding wheel 28.
The grinding wheel 28 is provided with a cover 220 which is automatically removed from position shown in the drawings while the diamond 1190 is dressing the wheel 28. The cover 220 is mounted upon a lever arm 221 pivotally connected by pivot screw 222 with a bracket 223 attached by screws 224 to a flange 225 of the table 160. The lever 221 is connected by a rod 226 with a lever 227 connected with the shaft 1194. It is, therefore, apparent that as the frame 1192 swings toward the grinding wheel 28 the cover 220 will be moved away from the face of the grinding wheel so as to permit the diamond to move without interference by the cover.
After each operation of dressing the grindmg wheel it must be fed automatically toward the work spindle 31 to compensate for the amount of grinding material removed by the diamond 1190. The automatic feeding of the wheel 28 axially toward the work is accomplished by mechanism shown more clearly by Figs. 16 and 17. The rod 182 which carries the carriage feed screw 181 is provided with a slot 230 which receives a pin 231 connected with the hub 232 of a ratchet The ratchet 233 is engaged by pawls 234 each nivotally supported upon a pivot screw 235 threaded into a pawl supporting arm 236 having a hub 237 loosely journalled upon the hub 232 of the ratchet 233. Each pawl 234 is urged against the ratchet 233 by a spring 238 having one end connected with the pawl 234 and the other with a spring post 239 attached to the pawl lever 236. The lever 236 is urged in a counterclockwise direction by spring 240 retained within a recess 241 pro vided by a bracket 242 attached by screws 243 to the table 160. One end of the spring 240 bears against a screw 244 threaded into the bracket 242 and the other end of the spring bears against a plunger 245 which engages the lever 236. Lever 236 is moved in a clockwise direction as viewed in Fig. 16 by rod 250 guided by a bracket 251 secured-by a screw 252 to the bracket 162. Adjacent its right hand end the rod 250 is provided with a recess 253 for receiving the cylindrical end 254 of a lever 255 which is integral with a friction clutch member 256 loosely mounted on the shaft 1194 and urged by a spring 257 against a friction disc 258 (see Figs. 13 and 15). The disc 258 is provided centrally with notches 259 by which it is is drivingly connected with lugs 260 extending from the plate 261 drivingly connected with the shaft 1194. The spring 257 is maintained in a state of compression by nuts 262 engaging the threaded extension 263 of the shaft 1194.
hen the shaft 1194 is oscillated in. the manner described, the lever 255 will oscillate but only to the extent determined by two set screws 270 and 271 which respectively limit the upward and downward movements of a lever 272 integral with the clutch memher 256. As shown in Fig. 16 the upper side of lever 272 is engaged by the lower end of screw 27 0 and the lower side of the bifurcated extension of lever 272 is engaged by a shoulder 273 provided by the screw 271. The screws 27 0 and 271 are threadedly connected with the table 160. By adjusting these screws the extent of travel of the rod 250 may be varied in order to vary the travel of the ratchet 233 and hence of the screw 181 which controls the position of the grinding wheel spindle carriage 166 along the table 160.
The carriage 166 is fed automatically onlyin a direction toward the work. When it is desired to retract the carriage 166 this is accomplished by turning the hand wheel 186. In order to permit turning the hand wheel in a direction to retract the carriage 166 the )tLWlS 234 must be disengaged from the ratchet 233. This is accomplished by moving a handle 280 toward the spindle carriage 166 as seen in Fig. 16. The handle 280 is connected with an L-shaped rod 281 which is slidably guided by the bracket 251 and has an end portion 282 adapted to engage the pawl 234 nearest to it and to thereby cause this pawl to move the other pawls 234 away from the ratchet 233. The rod 281 is maintained in the position shown in Fig. 16 by spring 283 and is retained in position for disengaging the pawls from the ratchet by a spring clip 284 shown in Figs. 16' and 3, said clip being attached by screws 285 to the bracket 162 which is provided with a slot 286 through which the rod 281 extends. The handle 280 is used particularly when the grinding wheels are replaced. As the wheels are worn away their thickness decreases requiring them to be automatically fed toward the work. When the wheels have been worn away to such an extent that they can no longer be used it is necessary to replace them with new wheels. This necessitates locating the wheel spindle carriages at distances more remote from the work. As stated before in order to accomplish this by rotating the hand wheels 186 it is necessary to move the handle 280 toward the work carriage 166 so that the ratchet 233 will turn free of the pawls 234.
The cross frame 34 supports brackets 290 one of which is shown in Fig. 8 which support a splash guard 291 which catches the liquid directed upon the grinding wheels for lubricating and cooling the same. The nozzles for directing the lubricant upon the work are not shown as they form no part of the present invention. The guard 291 provides an annular flange 292 (see Fig. 2) surrounding a central orifice through which the grinding liquid may pass to an annular groove 293 provided by the cam supporting plate 47. Tubes 294 direct the liquid into an annular chamber 295 providcd by the frame 34, said chamber being connected with a drain pipe 296.
While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow. 7
What is claimed is as follows:
1. Grinding apparatus for shaping the contour of fiat plates comprising, in combination, a work-ho1der supportin a flat plate for rotation on an axis at rig t angles to its plane; a grinding wheel having a plane surface for grinding the contour of the plate, said wheel rotating on an axis arallel to the plane of the plate; and means "or concurrently rotating the work-holder and bodily moving the wheel.
2. Grinding apparatus for shaping the contour of flat plates comprising, in combination, a work-holder supporting a fiat plate for rotation on an axis at right angles to its lane; a grinding wheel having a plane sur .ace for grinding the contour of the plate, said wheel rotating on an axis arallel to the plane of the plate; and means or concurrently rotating the work-holder and axially moving the wheel.
3. Apparatus according to claim 2 having means for automatically sto pin rotation of the support atter one eye e 0 movement thereof.
4. Apparatus according to claim 2 having means for automatically stopping rotation of the support after one cycle of movement thereof and means for automatically dressing and feeding the grinding wheel.
5. Apparatus according to claim 2 having means for automatically dressing the grinding wheel between grinding operations and feeding the wheel to compensate for the grinding material removed.
6. Grinding apparatus for shaping the contour of a flat plate comprising, in combination, a shaft, a work support carried by said shaft and supporting the fiat plate for rotation about an axis at right angles to its plane, a grinding wheel rotatable on an axis parallel to the plane of the plate and having a plane grinding surface engaging the edge of the plate, a movable frame for the wheel, a master cam carried by said shalt, a cam follower connected with the grinding wheel frame and cooperating with the cam, and means for oscillating the shaft while the wheel engages the plate.
7. Grinding apparatus for shaping the contour of a flat plate comprising, in combination, a shaft, a work support carried by said shaft and supporting the flat plate for rotation about an axis at right angles to its plane, a grindin wheel rotatable on an axis parallel to the plane of the plate and having a plane grinding surface engaging the edge of the plate, a grinding w ieel frame guided for bodily movement axially of the wheel, a master cam carried by said shaft, a cam follower connected with the grinding wheel frame and cooperating with the cam, and
\ means for oscillating the shaft while the wheel engages the plate.
8. Grinding apparatus for shaping the contour of cams comprising, a rotatable cam blank support, a grinding wheel rotatable on an axis transverse to the axis of the support, and cam means for automatically rotating the support and concurrently moving the grinding wheel bodily while the wheel engages the blank.
9. Grinding apparatus for shaping the contour ct cams comprising, a rotatable cam blank support, a grinding wheel rotatable on an axis transverse to the axis of the support, and a plurality of cams for automatically rotating the support and concurrently moving the grinding wheel bodily while the wheel engages the blank.
10. Grinding apparatus for shaping the contour of cams comprising a rotatable cam blank support, a plurality oi grinding wheels rotatable on axes transverse to the axis of the support, a cam for rotating said support and another cam for concurrently moving the grinding wheels bodily while said wheels engage the cam blank.
11. Grinding apparatus for shaping the contour of cams comprising, a rotatable cam blank support, a plurality of grinding wheels rotatable on axes transverse to the axis of the support, means for rotating said support, and
neeaom a cam on said support for concurrently moving said grinding wheels axially at a predetermined rate relative to the speed of rotation of the support while the wheel engages the cam blank.
12. Grinding apparatus for shaping the contour of cams comprising, a rotatable cam blank support, a plurality of grindin wheels rotatable on axes transverse to the axis of the support, a cam for automatically rotating said support and another cam for simultaneously moving all of said grinding wheels axially at a predetermined rate relative to the speed of rotation of the support while the wheel engages the cam blank.
13. Grinding apparatus for shaping the contour of cams comprising an oscillatable cam blank support, a grinding wheel rotatable on an axis transverse to the axis of the support, and means for oscillating the support and concurrently reciprocating the grinding wheel on its axis while the wheel engages the cam blank, said means comprising a plurality of cams.
l4. Grinding apparatus for shaping the contour of cams comprising, an oscillatable cam blank support, a grinding wheel rotatable on an axis transverse to the axis of the support, a plurality of cams for oscillating the support and concurrently reciprocating the grinding wheel on its axis while the Wheel engages the cam blank, said cams being so designed that a plurality of oscillations of the cam blank and reciprocations of the grinding wheel are efiected during the cycle of operation of the cams.
l5. Grinding apparatus for shaping the.
contour of cams comprising, an oscillatable cam blank support, a grinding wheel rotatable on an axis transverse to the axis of the support, a plurality of cams for oscillating the support and concurrently reciprocating the grinding wheel on its axis a plurality of times during one cycle of operation of the cams and while the wheel engages the cam blank, said cams being so designed that a relatively slow movement of the cam blank support and grinding wheel is followed by a relatively rapid movement thereof.
16. Grinding apparatus for shaping the contour of a fiat plate comprising, in combination, a shaft; a work support carried by said shaft and supporting the fiat plate fdr rotation about an axis at right angles to its plane; a grinding wheel rotatable on an axis parallel to the plane of the plate and having a plane grinding surface engaging the edge of the plate; a grinding wheel frame guided for bodily movement axially of the wheel; a master cam carried by said shaft; a. cam follower connected with the grinding wheel frame and cooperating with the cam; means for oscillating the shaft while the Wheel engages the plate; and means for automatically 7 parallel to the plane of the plate and having a plane grinding surface engaging the edge of the plate; a grinding wheel frame guided for bodily movement axially of the wheel, a master cam carried by said shaft; a cam follower connected With the grinding wheel frame and cooperating with the cam; means for oscillating the shaft While the wheel engages the pl-ate; means for automatically stopping rotation of the work support after one cycle of movement thereof and means for automatically dressing the grinding wheel between grinding operations and feeding the wheel to compensate for the grinding material removed.
18. Grinding apparatus for shaping the contour of a flat plate comprising, in combi nation, a shaft; 2. work support carried by said shaft and supporting the fiat plate for retation about an axis at right angles to its plane; a grinding wheel rotatable on an axis parallel to the plane of the plate and having a plane grinding surface engaging the edge of the plate; a grinding wheel frame guided for bodily movement axially-of the Wheel; a master cam carried by said shaft; a cam follower connected. with the grinding wheel frame and cooperating with the cam; means for oscillating the shaft while the wheel engages the plate; and means for automatically dressing the grinding wheel between grinding operations and feeding the wheel to compensate for the grinding material removed.
19. In a grinding apparatus the combination of a grinding wheel; a dresser; a wheel guard; means for moving the dresser against the wheel for removing the guard from the path of the dresser. Y
20. In a grinding apparatus the combination of a grinding wheel; a dresser; a wheel guard; means effecting relative. movement between the grinding wheel and the dresser and for removing the guard from the point of en gagement of the dresser with the grinding wheel.
21'. In a grinding apparatus the combination of a grinding wheel; a shaft; a dresser pivotally mounted on the shaft; a movable wheel guard; driving connections between the wheel guard and the shaft; and means for rocking said shaft so as to move the dresser toward and past the wheel and causing the wheel guard to remove from the path of the dresser through the said driving connect-ions.
22. In a grinding apparatus the combination of a work support; a shaft rotating the work support; a cam on said shaft; a rotary grinding wheel; a bodily movable frame supporting said wheel; a cam follower cooperating with said'cam and adjustahly connected to the frame; cam operated means for operating the cam shaft; and asecond cam operated means for adjusting the frame with respect to the cam follower. v
23. In a griding apparatus the combination of a shaft; a work support on said shaft;
a cam on said shaft; a rotary grinding wheel; a bodily movable frame supporting said wheel; a cam follower cooperating with the said cam and adjustably connected to the frame; cam operated means for operating the cam shaft; and a second cam operated means for adjusting the frame with respect to the cam follower.
24. In a grinding apparatus the combination of a shaft; a work support on the shaft; a master cam on the shaft; a rotary grinding wheel; a bodily movable frame supporting said wheel; a master cam follower adjustably connnected to the frame cam operated means for operating the master cam shaft; a dresser for the grinding wheel and a second cam operated means for adjusting the frame with respect to the mastercam follower and for operating the dresser.
25. In a grinding apparatus the combination of a shaft; a work support on the shaft; a master cam on the shaft; a rotary grinding wheel; a. bodily movable frame supporting said wheel; a master cam follower adjustably connected to the frame; cam operated means for operating the master cam shaft; a dresser for the grinding wheel surface; a movable wheel guard; and a second cam operated means for adjusting the frame with respect to the master cam follower and for operating the dresser and removing the guard from the path of the dresser.
26. In a grinding apparatus the combination of a shaft; :1 work support on the shaft; a master cam on the shaft; a rotary grinding wheel; a bodily movable frame supporting said wheel; a master cam follower adjustably connected to the frame a second shaft coaxial with the master cam shaft; cam operated means on the second shaft for operating the master cam shaft; and another cam operated means on the second shaft for adjusting the frame with respect to the master cam follower.
27. In a grinding apparatus the combina tion of a shaft; a work support on the shaft; a master cam on the shaft; a rotary grinding Wheel; a bodily movable frame supporting said wheel; a master cam follower adjustably connected to the frame; a second shaft coaxial with the master cam shaft; cam operated means on the second shaft for operating the master cam shaft; :1 dresser for the grinding wheel surface; means for adjusting the frame with respect to the master cam follower; a third shaft transverse to the master i cam shaft operating the dresser and the last said means; and another cam operated means on the second shaft for actuating the third shaft.
28. In a grinding apparatus the combination of a shaft; a work support on the shaft; a master cam on the shaft; a rotary grinding wheel; a bodily movable frame supporting said wheel; a master cam follower adjustably connected to the frame a second shaft coaxial with the master cam shaft; cam operated means on the second shaft for operating the master cam shaft; a dresser for the grind ing wheel surface; a movable wheel guard; means for adjusting the frame with respect to the master cam follower; a third shaft transverse to the master cam shaft operating the dresser and the last said means and removing the wheel guard from the path of the dresser; and another cam operated means on the second shaft for actuating the third shaft.
29. in a grinding machine the combination of a grinding wheel rotating at constant speed; a worlrholder movably supporting a workpiece; means for oscillating the word"- piece and bodily moving the grinding wheel while it engages the workpiece; said means ellecting a plurality of oscillations at varying rates of speed.
30. in a grinding machine the combination of a grindin wheel rotating at constant speed; a worliholder movably supporting a workpiece; means for oscillating the workpiece and axially moving the grinding wheel when its plane side face engages the worlr.
31. In a grinding machine the combina tion of a grinding wheel rotating at constant speed; a shaft carrying a workpiece; a master cam also carried by said shaft; a cam :Eollower controlling bodily movements of the grinding wheel; an actuating means which oscillates the shaft a plurality of times at varying rates of speed while the grinding wheel engages the work.
32. In a, grinding machine the combination of a support for supporting a workpiece; a grinding wheel; a movable frame carrying the grinding wheel a master cam controlling the movement of the frame; a shaft; means on said shaft for bodily moving the minding wheel frame relative to the master cam in response to rotation of the shaft; a hand wheel on said shaft for manually turning the same; ratchet mechanism tor turning the shaft between grinding operations; said ratchet mechanism normally resisting rotation of the shaft in one direction b the hand wheel; and means for disabling t e ratchet mechanism.
33. In a grinding machine the combination of a support for supporting a workpiece; a grinding wheel; a movable frame can ing the grinding wheel; a master cam contro ling the movement of the frame; a shaft; means on said shaft for bodily moving the grinding wheel frame relative to the master cam in response to rotation of the shaft; a hand wheel on said shaft for manually turning the same; a member having an overtravel for operating the ratchet mechanism; yielding means for imparting motion of the member to' the ratchet mechanism and at least one adjustable stop for varying the movement imparted by the yielding means to the ratchet mechanism.
34. In a grinding machine the combination of a support for supporting a workpiece; a grinding wheel; a movable frame carrying the grinding wheel; a master cam controlling the movement of the frame; a shaft; means on said shaft for bodily moving the grinding wheel frame relative to the master cam in response to rotation of the shaft; a hand wheel on said shaft for manually turning the same; a member having an overtravel for operating the ratchet mechanism; a friction disc imparting motion of the member to the ratchet means; and at least one adjustable stop for varying the movement of the friction disc.
35. in a grinding apparatus for grinding opposite edges of a plate the combination of a work support pivotally supporting a plate at an intermediate point; grinding wheels operatin "with their plane surface on op- 'oosite edges of the plate; a master cam for bodily moving the grinding wheels while they engage the edges of the plate; and another cam for moving the plate about an intermediate point and controlling move- 1 meat of the master cam.
36. in a grinding apparatus for grinding opposite edges of a plate the combination of worl: support pivotally supporting a plate at an intermediate point; grinding .heels operatin with their plans surface on opposite e ges of the plate; a master cam for axially moving the grinding wheels while the same engage the edges of the plate; and another cam for moving the plate about an intermediate point and controlling movement of the master came 37. In a; grinding apparatus for grinding opposite edges of a plate the combination of a worlr support pivotally supporting a plate at an intermediate point; grindin wheels simultaneously operating with their plane S111- face engaging opposite edges of the plate; a shaft; a. master cam for anially moving the grindin wheels while the same engage-the edges 0 the plate; and another cam for moving the late about an intermediate point and controlling movement of the master cam.
88. In a grinding apparatus for grinding opposite edges of a late on opposite sides of its center, the com ination of a work support for supporting a plate for rotation about an axis normal to the plane of the plate; grinding wheels operating with their plane surface on opposite edges of the plate and lilon opposite sides of the center thereof; a
shaft car g the support; and a cam on said shaft for odily movin the grinding wheels while the same engage tie edges of the plate; 5 and means for rotating the shaft.
39. In a grinding apparatus for grinding opposite edges of a. plate on opposite sides of its center the combination of a work support for supporting a, plate for rotation about an 10 axis normal to the plane of the plate; grinding wheels operating with their plane surface on opposite edges of the plate and on opposite sides of the center thereof; a master cam rotating coaxially with the support; and means 15 cooperating with the cam for axially moving the grinding wheels while they engage the edges of the plate.
In testimony whereof we hereto afiix our signatures. LOUIS G. GOAD. LEO C. SHIPPY.
US388394A 1929-08-26 1929-08-26 Grinding apparatus Expired - Lifetime US1883016A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608802A (en) * 1950-04-01 1952-09-02 Gen Motors Corp Cam grinding machine
FR2479063A1 (en) * 1980-03-25 1981-10-02 Thielenhaus Ernst Kg METHOD FOR SHAPING CAM TREES BY PRECISION CORRECTION
FR2479064A1 (en) * 1980-03-25 1981-10-02 Thielenhaus Ernst Kg TWO-STEP CAMSHAFT MACHINING MACHINE BY PRECISION CORRECTION

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608802A (en) * 1950-04-01 1952-09-02 Gen Motors Corp Cam grinding machine
FR2479063A1 (en) * 1980-03-25 1981-10-02 Thielenhaus Ernst Kg METHOD FOR SHAPING CAM TREES BY PRECISION CORRECTION
FR2479064A1 (en) * 1980-03-25 1981-10-02 Thielenhaus Ernst Kg TWO-STEP CAMSHAFT MACHINING MACHINE BY PRECISION CORRECTION

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