US1580442A - Control mechanism for grinding apparatus - Google Patents

Description

April 13 1926 C. H. SCHURR CONTROL MECHANISM FOR GRINDING APPARATUS Filed April e. 1923 4 Sheets-Sheet 1 win WNW A rifl 13' 1926. 1,580,442

c. H. SCHURR CONTROL MECHANISM FOR GRINDING APPARATUS Filed April 6. 1923 4 Sheets-Sheet 2 4 7 T. v 4 v v I 205 i g ll/Mill w i i Q II I;

G. H. SCHURR April 13 9 1%26.

CONTROL MECHANISM FOR GRINDING APPARATUS A ril 13 1926. 1,580,442

C. H. SCHURR CONTROL MECHANISM FOR GRINDING APPARATUS Filed April 6. 1923 4 4 Sheets-Sheet 4 Patented Apr. 13,1926.

UNITED' 'STATES PATENT v OFFICE.

CHARLES H. SGHUBB, OF CLEVELAND, OHIO, ASSIGNOB TO THE LEES-BRL'DNEB COH- rm, 0] CLEVELAND, OHIO, A CORPORATION OF OHIO.

common unonmxsm FOB GRINDING arrm'ros.

Application filed April 6, 1923. Serial No. 630,282.

7 '0 all whom it may concern:

Be it known that I, CHARLES H. SCHURR, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in and Relating to Control Mechanism for Grinding Apparar Ens, of which the following is a specificaion.

This invention relates to an apparatus for cutting or grinding gears or gear blanks, more particularly to a. mechanism adapted to stop the operations of the apparatus at a predetermined point or position, whereby danger of grinding one or more teeth of a gear more than the remaining teeth thereof is avoided. For purposes of illustration, the

invention has been applied to an apparatusthat-fisconstructed to grind spur gears'of the involute tooth type, but it will be understood that the invention may be embodied in machines or apparatus of other types and for cutting or grinding other forms of teeth and gears. The invention has by preference, v

been embodied in an apparatus such as shown in myco-pending application Ser. No.-

561,219, filed May it, 1922.

One object of the invention is to provide an improved mechanism which automati-- cally operates to sto the cutting or grinding operations at a pre etermmed point or posi tion, whereby such operations are stopped when all or a, predetermined number of the teeth of the gear have been acted upon by the tool of the apparatus one or more times, accordingly as the mechanism is set or adjusted.

Another object of the invention is to provide an improved stopping or throw-out mechanism, so constructed that it may be set for gears having an number of teeth, whereby varyin size gears may be operated upon and t e apparatus stopped at the desired point.

Other objects of the invention will be apparent to those skilled in the art to which my invention relates from the following description taken in connection with the accompanying drawings, wherein- Fig. 1 is a side elevation, partly in section, of an apparatus embodying my invention.

Fig. 2 is a section on the line 2-2 of Fig. 1.

' driven,

Fig. 2 is a fragmentary view, partly in rection'ofrotation of the shaft that effects compound or rolling movement of the gear supporting spindle.

Fig. 4 is a section on the line 44 of' Figs. 3 and 6.

Fig. 5 is a section on the line 5-5 of Fig. 3.

Fig. 6 is a plan view of the parts shown in Figs. 7 and 8, partly in section.

Fig. 7 is a fragmentary side elevation from the rear side of the apparatus, With parts broken away.

Fig. 8 is a view similar tov Fig. 7, but showing thethrust member operating to move the operating handle to its oil position.

Fig. 9 is a perspective view of a detail part. I

In the drawings, 1 indicates as an entirety a. suitable frame,-having an upright supporting member 2 and guides 3 for a slide 4.

also adjustable in a direction which will.

position the tool 9 at the desired angle, relative to the vertical plane cutting the axis of the gear, indicated at A.

Intermediate its ends, vided with a ulley 10, around which runs a belt 11, gui ed to and from the pulle 10 by pulleys 12, 13, and driven by a belt w eel 14,'fixed to a shaft 15; this latter shaft being preferably driven at one end by. the mechanism indicated as an entirety at 16. At its other end, the shaft 15 is connected with a driving mechanism, indicated as an entirety first in one direction and then in the other direction, whereby compound or rolling movement of the gear A relative to the tool 9 results; although it will be understood that so far asmy invention is conthe shaft 6 is proat 17, through which a shaft 80 is cerned this relative movement may be otherwise effected. in the illustrated construction of the apparatus, the shaft 80 oscillates about its axis, a spindle 19 which supports the gear A, and through the coaction of tapes 20, connected with the frame 1 and the slide 4, which rotatably supports the spindle 19, the slide and spindle are reciprocated during the oscillation of the spindle, whereby the generating movements of the gear A are carried out. The tapes 20 are by preference suitably secured to a bracket 20, adjustably engaging suitable guides 20 provided on the upright 2 and supported in the desired position by an adjusting device 20, whereby the fixed ends of the tapes may be positioned to permit different sized gears to be supported on the spindle 19 and cut or ground.

As will be understood, following the rolling movement of the gear in one direction and then in the other direction, the gear A moves out of engagement with the tool 9 and during this period of disengagement, a suitable indexing mechanism, indicated as an entirety at 21, operates and efiects a movement of the gear supporting spindle 19 a predetermined distance so that in the next cycle of movement of the gear A the tool 9 will engage the adjoining tooth thereof. These operations are carried out until all of the teeth have been ground to the desired extent.

So far as I am aware, in cutting or grinding gears, it is cutomary for the operative to mark the tooth which is first engaged by the tool and to watch the apparatus as the operations upon the successive teeth take place and to stop the machine after the last tooth is operated upon, so that .the first tooth and adjoining teeth will not be acted upon a second time and therefore have a greater amount of material removed from it or them than from the remaining teeth. 7

The present invention is adapted to arrest or stop the grinding operations automatically when the gear A has made one com lete revolution or a PI'QdEbQIlI'IlIlGtl num er of complete revolutions incident to the movements above referred to and the indexing of the gear from one tooth to another, so'that each tooth or the corresponding faces of the teeth will be ground an equal amount and danger of carrying the grinding operations to or beyond the first tooth ground is avoided. Accordingly, by means of mechanism, indicated as an entirety at 22, I automatically causethe movement of some element, for example, the. operating handle 155, and thus stop the movement of the shaft 80, in the manner to be later set forth.

Of the driving mechanism 17, 130 indicates a set of change gears, preferably comprising a pinion 131 fixed to the driven shaft 15 (see Fig. 3) and a gear 132 meshing with the pinion 131. The gear 132 is fixed to and continuously drives a counter housing 136 which is bolted to the main frame in any desired manner. The hous ing 136 may be provided with an opening 137, adapted to be closed by a cover 138. 139, 140, indicate a pair of gears fixed to the countershaft 133; the former meshing with and transmitting power through an idler 141 loosely mounted on a shaft 142 (see Fig. 4) to a gear 143 loosely mounted on a supplemental shaft 144; and the latter meshing with a gear 145 loosely mounted on the shaft 144. The shaft 144 is preferably mounted in suitable anti-friction bearings 146, 146, supported in seats formed in suitable collars removably mounted in the end walls of the housing 136. The gears 1 43, 145, are respectively provided on their opposing sides with collars 149, the free ends of which are shaped to provide clutch elements 150 with either of which a clutch lmeniber 151 splined to the shaft 144 is arranged to engage. The clutch member 151 is provided with an annular groove 151 in' which a yoke or other suitable device 152 fits, whereby the clutch member 151 may be moved endwise of the shaft 144 out of engagement with one of the clutch elements 150 and into engagement with the other clutch element; it being understood that (1) when the clutch member 151 engages a clutch element 150 for the gear 145, the shaft 144 will be driven in one "direction and (2) when the clutch member 151 engages the clutch element for the gear 143 the shaft 144 will be driven in the opposite direction-such reverse direction being effected by interposing the idler 141 between the gears 139 and 143. The yoke 152 is pro-- vided with studs 152 which fit into the groove 151 The yoke 152 preferably forms part of a bell-crank 168, to which reference will later be made. 153 indicates a gear connected to the shaft 144 (being splined thereto for a urpose which will later appear) and meshing with a gear 153" loosely mounted on the shaft 80, the outer end of which is mounted in suitable bearings provided in the housing 136. For reasons which will later appear, the gears 153, 153, are preferably spiral gears, and the gear 153 is relatively wide so that it may move longitudinally of the shaft 144 without being disconnected from the gear 153*. 154 indicates a clutch inter-posed between the gear 153 and the shaft 80 and controlled manually by the handle lever 155. The clutch 154 comprises a clutch element 154 fixed to the gear 153 and a sleeve 154 splined to the shaft 80 and having a clutch element 154 engageable with the clutch element 154. The sleeve 154 is operated endwise of the shaft by a yoke member 155' .slidably mounted on arod 156, and the yoke member 155 is operated by a lever 157 fixed to a rock shaft 158 mounted in a cover 169 (see Figs. 5 and 6), which may be secured in any suitable manner to thehousing 136. The rock shaft 158 extends through the cover 169 and has secured to it the handle or lever 155 by which-it is operated. 161 indicates a worm preferably integrally formed with a sleeve 161* fitting on and fixed in any desired manner to the shaft- 80. The worm 161 meshes with a worm wheel 162 fixed to a transverse shaft 163 mounted in suitable bearings 164, as shown in Figs. 4 and 6, provided in walls of a housing 164 forming part of the cover 169. At its outer end. the shaft 163 carries a disk 165, on which is mounted a pair of spaced stops 166, 167. The lever 168 is provided with a hub 170 adapted to rock on a stud shaft 169 supported by a boss 17 0', see Fig. 4. One end of the lever 168 extends upwardly between the stops 166, 167 so as to be engaged there by. The shaft 80. is preferably formed in sections, one being indicated at 86 and the other being indicated at 80". The section 80 comprises a sleeve portion 80. into which one end of the section 80 fits. The remaining portion of the shaft section 80 is reduced to receive the worm sleeve 161, gear 153 and clutch sleeve 154".

The operation of the reversing mechanism may be briefly described as follows :--the power of the shaft 15 is transmitted through the change gears 136, shaft 133 and one of the lgears 143, 1.45, to the shaft 144, acc0rdingly as the clutch member 151 is engaged with one or the other thereof. The shaft 144 through the gears 153, 153, and the clutch 154 will rotate the shaft 80 and the latter, in turn, through the worm 161 and the worm wheel 162, will rotate the transverse shaft 163. The latter shaft rotates the disk 165 and causes one of the stops, for example, the stop 166, to engage the lever 168 and move it about'its pivot 169', such operation, serving to disengage the clutch member 151 from one gear clutch element 150 and engage it with the clutch element 150 of the other gear. The shafts 144, 80 and 163 will then rotate in the opposite direction until the stop 167 engages the lever 168 and swings it to its first position. Such reversal operations will continue as long as the machine operates, or until the clutch 154 is thrown out by movement of the lever 155.

It will be noted from the foregoing description that the shaft 80 is'rotated for a predetermined number of revolutions ineither direction. By adjusting either stop 166, 167, the shaft 80 may be rotated in either direction a larger or smaller number of times. For this purpose, each of the stops 166, 167, comprises a pin having a 1 of the gear 153 and disposed between it and the adjacent collar 182. As already set forth the gear153 issplined to the shaft 144, but is free to move longitudinally thereof in either direction against the tension of one of the springs 183. As already described, the gears 153, 153, are spiral gears, so that their resulting meshing, action causes a thrust in one direction or. the other accord ing to the direction in which the shaft 144 is transmitting power. Accordingly, when the rotation of the shaft 80 is reversed and it, through the tapes 20, starts to move the carriage or slide 4 in the correspondingly opposite direction, the reaction of the gears 153. 153, incident to'picking up the slide and transmitting power through their spiral teeth, will cause the-gear 153 to slide endwise of the shaft 144 against one of the springs 183, which will thereupon absorb or cushion such thrust movement; the effect M of which will be to start movement of the carriage or slide in the reverse directlon relatively slowly without jerking it. The springs 183 are preferably of a size to re turn the gear 153 to substantially its midposition after the carriage or slide 4 has been reversed and started on its return movement.

245 indicates a hand wheel having ahub 246 loosely fitting the outer end of the shaft 80 (see Fig. 3), being held thereon by any suitable means, for example by a washer 247 and a nut 248. The inner end of the wheel hub 246 rotatably fits the outer end of a bushing 249 which forms one bearing for the shaft 80. The end wall of the hub 246 is provided with clutch elements 250 adapted to be engaged by the clutch elements 251 on the adjacent end of the clutch member 154 so that when the latter is disengaged from the gear 153 it will connect the shaft 80 to the hand wheel 245. This construction permits the shaft" 80 to be manually rotated to adjust the carriage or slide 4 or the gear blank A relative to the tool 9.

Of the stopping or throw- out mechanism 22, 23 indicates a control element adjustably fixed to the shaft 163, preferably on that end remote from the disk 165, by a nut or other device 163'. The control element preferably comprisesa disk having an elevated portion. one end of which serves as a cam 24 to operate feed devices 26 and the other end of which serves as an abutment 25 to engage and actuate a dog 27 and through it move the handle 155 to its neutral or off posi- 183 indicates a springllll) &

tion (see Fig. 8). 28 indicates a thrust member slidably fitting a cut-away 29 formed in the walls forming the cover 189 and housing 164 (see Figsd, 7 and 8). 30 indicates a plate overlying the cut-away 29 and serving to hold the thrust member 28 in operative relation to the walls of the cutaway 29. The lower wall of the cut-away 29 is provided with a rib 29, which fits a correspondingly shaped groove 28 formed in the thrust member 28 to guide and prevent lateral movement of the latter, but to permit the thrust member to be exposed along its outer side so that the dog 27 can be pivoted to the side wall of the thrust member and operate about its pivot. The tail 31 of the dog 27 is arranged to be engaged by the abutment 2-5, as shown in Fig. 8. At its front end the dog 27 is provide-d with a nose 32 which rides or slides on the under side of the plate 30. 30 indicates a recess formed in the under side of the plate 30and adapted to receive the nose 32 as the thrust member approaches its operating position (see Fig. 8) to permit the dog to swing on its pivot to position its tail portion 31 for engagement by the abutment 25. 33 indicates a supplemental plate arranged 'rearward of the plate 30 and having a depending arm 34 disposed in the path of movement of the thrust member 28 to limit its movement rearwardly at a predetermined position; The plate 33 is formed with an elongated slot through which one or more bolts 35 pass to fit into suitably threaded openings formed in the housing wall to secure the plate 33 in the desired position. By loosening the bolts 35, the plate may be moved endwise of the guide way 29 to position the stop arm 34 at the desired position, thereby determining the starting position of the thrust member 28 and the distance it is to travel stcp-by-step to effect operation of the handle 155. By adjustment of the plate 33, the travel of the thrust member may be regulated to otlect the stopping of the machine when the tool as operated upon a predetermined number of teeth, or following one or more revolutions of the blank. I prefer to arrange the depending stop arm 34 at one end of the plate 33, and to provide at the other face of the plate an arm 3-1 that projects upwardly. This form of con struction enables me to turn the plate 33 over, thus positioning the arm 34 in the path of movement of the thrust member but at a greater distance from the handle 155 than the arm 3-1, thereby securing an increased range ot adjustments for the stop which controls the distance of travel of the thrust member 28. By removing the stop carrying plate 33, the thrust member 28 may be slid endwise of the uide-way 29 and removed therefrom. 36 lndicates a series of ratchet teeth provided on the upper surface of the thrust member 28 and arranged to be engagedand actuated by the feed devices 26. The feed devices 26 preterabhecomprise a lever 37 pivoted at 38 upon the wall of the housing 16% so that one end 37 thereof may engage with and ride on the periphery of the control element 23 and be actuated by the cam 24 thereof. The other end of the lever carries a pawl 39, the nose of which is arranged to engage with the teeth 36 on the thrust member 28. By this arrangement and construction, it will be seen that as the control element 23 oscillates, it will in each movement in one directibn swing the lever 37 about its pivot, and the lever in turn will operate the pawl 39 and the latter in turn will move the thrust member 28 endwise one step toward the left, as viewed in Figs. 7 and 8. From the foregoing description it will be understood that each oscillation of the control element corresponds to an oscillation of the work spindle 19 and the grinding of one tooth face of the gear A. Accordingly, it will bescen that it the thrust member 28 is positioned against the stop arm 34 or 34*, the feed devices 26 will move the thrust member 28 toward the left in Fig. 7 stcp-by-step until its free end engages the handle 155 and operates it. By proportioning the parts so that each operation of the feed devices 26 corresponds to one complete tooth grinding operation, it will be seen that when all of the teeth have been groundthat is, the corresponding faces of all of the teeth--the handle will be operated to its neutral or off position and the shaft 80 stopped by the disengagement of the clutch element 154, 154.

The nose 32 of the dog 27' is arranged to slide on the underside of the plate 30, as the thrust member 28 moves forwardly, until it reaches or approaches the limit of its movement outwardly, at which time the nose 32 moves into the recess 30*, due to the rocking of the dog 27 under the influence of the weight of its tail 31. This operation of the dog 27 will position its tail in position to be tmgaged by the cam or abutment 25, as the control element rotates counteuclockwisc, as viewed in Fig. 7, in the movement of the control element 23 in this direction following the rocking of the dog 27, as above set forth. the cam 25 will engage the tail 31. as it nears the end of its rotat-ive movement in the counter-clockwise direction. Being positively driven, the control element will act through the dog 27 and its pivot to ,move the thrust member 28 cndwise toward the left and thus actuate the handle 15:) in a relatively quick and positive manner, as shown in Fig. 8.

40 indicates a handle projecting laterally from the dog 27. By grasping the handle. the dog 27 may be swung about its pivot to release the tail 31 from the abutment- 25 and lll) i moved rearwardly against the stop arm 34 By preference, the feed devices 26 operate the thrust member the distance of one ratchet tooth. As the devices operate once for each complete grinding operation and between the grinding operations, the gear is indexed one tooth, it will be seen that the stop 34 or 34 must bepositioned to provide as many step-by-step movements of the thrust member 28 as there are=teeth on the gear A, to insure operationof the handle 155, release of the clutch 154 and stopping of the shaft 80. Where the gear teeth are ground more than once, the stop 34 or 34 is positioned so that in the travel of the thrust member 28 it will not engage and operate the handle 155 until the desired number of revolutions of the gear have been effected. While the stop 34 or 34 may be so positioned that the thrust member 28 will engage and operate the handle 155 at any desired point as the gear rotates, this is incidental to the construction.

'41 indicates a plunger havinga head 42 i slidably fitting a guide wall. 44 indicates a coiled spring interposed between the head 42 and an adjustable abutment 45 and normally acting against the plunger head to yieldingly press the plunger outwardly so that the latter may act against an extension 46 on the lower end of the lever 37 to maintain such end in engagemei'it with the periphery of the control element 23 and move the feed pawl 39 into its inoperative position when the control element 23 is rotated in the clockwise direction. 47 indicates a screw fitting a threaded opening in a lug 48, the free end of the screw being adapted to serve as a stop to limit the movement of the extension 46 by the plunger 41. By rotating the screw, its free end may be adjusted and thus regulate the throw of the lever 37 and the pawl 39 so as to insure.

proper engagement of the latter with the ratchet teeth 36 on the thrust member 28.

The operation of the stopping or throwout mechanism may be described as follows: The shaft 163 carries the control element 23, which being oscillated thereby operates through the cam 24 to rock the lever 37 and move the pawl 39. The pawl engages with the teeth 36 of the thrust member 29 and it moves or slides one step in each forward movement as each complete oscillation ofthe member 23 takes place. As the drive connections between the work spindle 19 and shaft 163 cause them to oscillate simultaneously, first in one direction and then in the other and as the blank rolls in one direction to a position out of engag ment with i the tool, the'blank is indexed, itwill be seen that the thrust member 28 is moved by the pawl 39 one step each time. a complete rolling,

ing movement of the blank is efiected, or one step for the grinding of each tooth and indez'zing of the blank to position the next tooth into grinding position. Accordingly, if the thrust member is ositioned so that it requires as many fee 'ng movements as there are teeth in the blank to be ground to' operate the lever 155, the latter will be moved into neutral position when theblank has made one complete revolution. The starting position of the thrust member is set by the adjustment of the plate 33, so that its arm will form an abutment or gauge against which the thrust member is positioned when moved to its starting position. As the control member 23 oscillates, it will effect forward movement of the thrust member 28, step by step, until it engages the handle 155. When the thrust member 28 approaches the handle 155, the dog 27, due to the recess 38 in the plate 30, swings downwardly to position its tail portion 31 in the path of the cam 25, whereby the latter may operate directly through the dog 27 upon the thrust member to swing thehandle 155 to neutral position, this latter operation serving to disconnect the clutch element 154 from the clutch element 154*.

From the foregoing description it will be seen that my construction is relatively simple and readily adjusted. Where gears of different pitches are to be ground, the thrust member and other parts may be removed and different sized parts substituted.

By means of my construction, I am enabled to grind gears with great rapidity and accuracy. Since danger of overgrinding certain of the teeth is avoided, the operative is relieved of responsibility and may attend more than one machine.

Of the indexing'mechanism 21, 200, 200 indicate sleeves surrounding and forming bearings for the gear supportin spindle 10 and rotatably supported in suita le bearings 201, provided-011 the slide 4. The sleeves 200, 200, are spaced apart to provide be tween them the segment 202. on'which the tapes 2O wind and unwind. The sleeve 200 carries at its outer end a se ment 203, having worm teeth 203', with w ich meshes the worm 204 secured to the outer end of the shaft 80. 205 indicates a disk removably carried on the outer end of the spindle 19. The disk 205 has formed in its periphery uniformly spaced notches 206 corresponding to the number of teeth of the gear A. 207, 208, indicate a pair of easing sections shaped to enclose the indexing mechanism 21 and serving as a support for certain elements thereof to be later referred to. The inner easing member 208 is formed with an openthe walls of which fit an annular recess on the outer faceof the bearing for the sleeve 200; the outer casin member 207 is formed with an opening w ich receives the outer end of the spindle 19; such outer end being screw threaded to receive a nut 209, which serves to hold the casing members 207, 208, in position and through the former, to secure the disk 205 on the spindle 19. 210, 211, indicate a pair of arms, supported on one of the casing sections, preferably the inner section 208. Each of the arms 210, 211 is supported on the inner face of the casing section 208 by a bolt and nut 212, the bolt extending through an opening in the arm and an opening 215) in the wall of the casing section. The opening 213 is elongated, so that upon loosening of the bolt and nut 212, they may be adjusted, either for different sized or notched disks or to insure accurate and positive operation of the elements which co-act during the indexing operation. 214 indicates a cam carried by the arm 210, preferably near its outer end. The cam 214 is pivoted to the arm 210 so that it may swing to the position shown in dotted lines in Fig. 2, for a purpose to be later set forth. The cam 214 is yieldingly maintained in its operative position (see full lines in Fig. 2) by a helical spring 215,

the ends of which are secured to the cam and arm. 216 indicates an element movably supported by an arm 217 which is preferably formed integrally with the outer end of the sleeve 200. The arm 217 extends radially from the sleeve end, but if desired, it and the worm gear segment 203 may be formed in one piece. At its upper end, the arm 217 is provided with a laterally projecting member 217 in the face of which is formed a slot 218 extending radially of the axis of the spindle 19 and serving as a guideway to slidably support the element 216. The element 216 carries at its lower end a dog 216 which engages a notch 206 and thereby locks the disk 205 and arm 217 together so that the shaft 80 may operate therethrough to rotate the spindle 19.

219 indicates a thrust element carried by the arm 217 and extending laterally therefrom. The thrust element 219 is preferably adjustably mounted on the arm 217, preferably by means of a slot which receives a bolt and clamps the element in position when the nut for the bolt is tightened. 220 indicates a pawl carried by the arm 211 and so arranged that when it is operated it will engage a notch 206 in the disk 205 and lock it against rotation. The tail 2.20 of the pawl 220 is disposed in the path of movement of the thrust element 219 so that the latter, when moving clockwise, as viewed in Fig. 2 will engage the tail and effect operation of the pawl 220 into engagement with the disk 205 and lock it, as shown in Fig. 2". 221 indicates a lug carried by the element 216 and having a cam face 221 which is arranged to engage the cam 214 as the spindle 19, disk 205 and arm 217 move clockwise.

Accordingly, in this movement, the cam 214, through the co-acting cam face 221, will cause the element 216 to slide upwardly out of locking engagement with the disk notch 206, following which disengagement, the thrust element 219 will engage and operate the pawl 220. This latter operation locks the disk 205 against movement, thereby allowing the element 216 to be moved over and engage the next or succeeding notch 206 as the arm 217 continues its movement to the end of its oscillation in the clockwise direction; it being of course understood that these operations are effected while the gear A is out of engagement with the tool.

To permit the pawl 220 to freely disengage the adjacent notch 206, following the indexing of the dog 216 from one notch to the next one, the pawl is jointed intermediate its ends, as shown at 222, so that it may ride the wall of the notch and swing downwardly to its inoperative position.

It will be understood that many alterations and modifications in construction and widely differing embodiments and applications of the invention will suggest themselves to those skilled in the art to which my invention relates without departing from the spirit and scope thereof. The disclosures and the description herein are purely illustrative and are not intended to be in any sense limiting.

What I claim is:

1. In apparatus of the class described, the combination with a frame, of a support carrying a tool, a slide mounted to reciprocate on said frame, a spindle for a blank mounted on said slide, means for reciprocating said slide and oscillating said blank spindle, means for effecting relative movement between said slide and tool support, means for indexing the blank, whereby successive portions thereof are acted upon by the tool, and means for automatically stopping the movement of said slide and blank spindle at a predetermined position of the blank.

In apparatus of the class described, the combination with a frame, of a spindle rotatably mounted thereon and carrying a tool, a separate spindle rotatively mounted on said frame and carrying a blank arranged to be engaged by the tool, means for rolling said blank spindle in opposite directions, means for indexing the blank, and means cooperating with the movements of the blank to stop said rolling means when the. lblank reaches any predetermined position.

3. In apparatus of the class described, the combination of a support for a blank, a sup port for a tool, means for effecting relative movement between said supports, means for indexing the blank-support, whereby successive portions of the blank are acted upon by the tool, a thrust member, and means for lll) progressively movin mm a predetermin position into engagement with an element of said moving means for automatically stopping the relative movement between said su' ports.

4a. In apparatus of the c ass described, the combination of a support for a blank, a support for a tool, means for effecting relative movement between said supports, means for indexing the blank support, whereby successive portions of the blan are acted upon by the tool, a thrust member, and a pawl and ratchet means for progressively movin said thrust member from a predetermin position 'into engagement with an element or said moving means for automatically stopping the relative movement between said supports.

5. In apparatus of the class described, the combination of a support for a blank, a support for a tool, means for operating said blank support to roll the blank relative to the tool, means for indexing the blank support, whereby successive portions of the blank are acted upon by the tool, a thrust member, a device operable in timed relation to the movement of the blank support, and means actuated by said device for progressively moving said thrust member from a predetermined position into engagement with an element of said moving means for automatically stopping the operation of said blank support.

6. In a paratus of the class described, the combination of a support for a blank, a support for a tool, means for operating said blank support to roll the blank relative to thetool, means for indexing the blank support, whereby successive portions of the blank are acted upon by the tool, a thrust member, a device operable in timed relation to the movement of the blank support, means actuated 'b said device for progressively moving sai thrust member from a predetermined position into engagement with an element' of said moving means for automatically stopping the operation of said blank support, and an abutment arranged to be adjusted to determine the starting position of said thrust member.

7. In apparatus of the class combination of a support for a blank, a support for a tool, means for effecting relative movement between said supports, means for indexing the blank, where y the successive portions. thereof are acted upon by the tool, a thrust member movable progressively from a predetermined""starting position into engagement with an element of said moving means, a driven member, means between said driven member and thrust member for moving the latter, and separate means arranged to operatively connect said thrust member and driven member together as the thrust member approaches the end of its said thrust member between said supports at a predetermined described, the

progressively moving said thrust member.

9. In apparatus of the class described, the

combination of a support for a gear, a support for a tool, means for oscillating said gear support, including a power means and a reversing mechanism, a cam oscillated by said power means, a thrust member progressively movable from a predetermined position into engagement with the throw-out element of said power means, means operated by said cam for pro ressively moving said thrust member, an a utment on said cam, and a. device carried by said thrust member and arranged to be engagedby said abutment when said thrust member approaches its operating position, whereby the .cam operates through said device and thrust member to move the throw-out element. 7 10. In apparatus of the class described, the. combination of a support for a gear, a support carrying a tool, means for efiecting relative movement between said gear support and tool support, means for indexin the gear, whereb the faces of the gear teet 1 are acted upon y the tool, and means 1hr automatically stopping the relative motion position of the gear, said stopping means having an adjustable element, whereby the predetermined stopping position can be changed at will.

11. In apparatus of the class described, the combination of a support for a. workpiece, a support carrying a tool, means for effecting relative movement between said supports, means for indexing the work-piece, whereby successive portions of the workpiece are. acted upon by the tool, and means operable step-by-step in correlation with the successive operations of the tool and arranged to stop the relative motion between said supports after a predetermined portion of the work-piece has been acted upon.

12. In apparatus of the class described, the combination of a support, an element ciprocably mounted thereon, a' workiece supporting element rotatably mounte on said reciprocable element, power means including a driving connection with one of said elements for efi'ecting rolling movements of the work-piece in opposite directions, a tool operatively mounted on said support, means operable by said power means for stopping said means at a prede termined position. 1

13. In apparatus of the class described, the combination of a tool support, a workpiece support, means for effecting relative movement between said supports, whereby the tool engages the work-piece. power mechanism for operating said means, said mechanism including a driven element and devices which reverse the direction of movement thereof, a pawl and ratchet means arranged to be operated by said driven element, and a thrust member actuated by said,

pawl and ratchet means and arranged to throw out said power mechanism when actuated to a predetermined position.

14. In apparatus of the class described, the combination of a tool support, a workpiece support, means for effecting relative movement between said supports, whereby the tool engages the work-piece, power mechanism for operating said means, said mechanism including a driven element, a feeding means arranged to be operated by said driven element, and a thrustniember actuated by said feeding means and arranged to throw out said power mechanism when actuated. to a predetermined position.

15., In apparatus of the class described, the combination of tool support, a workpiece support, means for effecting relative movement between said supports, whereby the tool engages the work-piece, power mechanism for operating said means, said mechanism including a driven element, a feeding means arranged to be operated by said driven element, a thrust member actuated by said feeding means, and devices having an element connected with said thrust member and arranged to be engaged by said driven element at a predetermined position of the work-piece, whereby the last mentioned driven element causes said thrust member to throw-out said power means.

16. In apparatus of the class described, the combination of a tool support, a workpiece support, means for effecting relative movement between said supports, whereby the tool engages the work-piece, power mechanism for operating said means, said mechanism including a driven element and devices which reverse the direction of movement thereof, a feeding means connected with and operable by said power mechanism, a thrust member arranged to be actuated by said feeding means to a predetermined position, and devices having an element connected with said thrust member and arranged to be engaged by a driven element of said power mechanism when sald thrust 17. In apparatus of the class described, the combination of a tool support, a workpiece support, means for effecting relative movement between said supports, whereby the tool engages the work-piece, power mechanism for operating said means, said mechanism including a driven element and devices which reverse the direction of movement thereof, a feeding means connected with and operable by said power mechanism, a thrust member arranged to be actuated by said feeding means to a predetermined position, a device movably carried by said thrust member, and means for maintaining said device in inoperative position until said thrust member reaches its predetermined position and then allowing said device to move into engagement with a driven element of said power mechanism whereby the last men tioned driven element operates through said device and thrust member to throw-out said power mechanism.

18. In apparatus of the class described, the combination of'a tool support, a workpiece support, means for effecting relative movement between said supports, whereby the tool engages the work-piece, power mechanism for operating said means, said mechanism including a driven element and devices which reverse the direction of movement thereof, a pawl and ratchet means connected with and operable by said power mechanism, and a thrust member actuated by said pawl and ratchet mechanism and arranged to throw out said power mechanism when actuated to a predetermined position, and mechanism for regulating the throw of the pawl of said pawl and ratchet means,

19. In apparatus of the class described, the combination of a tool support, a workpiece support, means for effecting relative movement between said supports, whereby the tool engages the wort-piece, power mechanism for operating said means, said mechanism including a driven element and devices which reverse the direction of movement thereof, a handle for throwing said power mechanism in or out, means interposed between said handle and a driven element of said power mechanism for moving said handle to neutral position to throwout said power mechanism, said throw-out mechanism including a thrust member having a travel correspondin to the number of operations to be effected by the tool on the work-piece.

20. In apparatus of the class described, the combination of a tool support, workpiece support, means for effecting relative movement between said supports, whereby the tool engages the work-piece, power mechanism for operating said means, said mechanism including a driven element and de vices which reverse the direction of movement thereof, a handle for throwing said power mechanism in or out, means inter posed between said handle and a driven ele ment of said power mechanism for moving aid handle'to neutral position to throw-out said power mechanism, said throw-out mechanism including a thrust member having a travel corresponding to the number of operations to be efiected by the tool on the work-piece, and means for Varying the travel of said thrust member.

21. In apparatus of the class described, the combination of supporting means for a blank, a spindle for a tool, an indexing mechanism between the elements of said supporting means serving to connect and disconnect said elements to permitindexing of the blank, whereby successive portions thereof are acted upon by the tool, mechanism for operating said supporting means to effect rolling movement of the blank relative to the tool, said mechanism including a device for connecting in and throwing out said operating mechanism, a thrust member, and means actuated by said operating mechanism for moving said thrust member step by step toward said device and into engagement therewith to move the same into throw-out position at a predetermined position of the blank.

22. In apparatus of the class described,

the combination with a support, of a sleeve rotatively mounted thereon, a spindle carrying a blank mounted. in said sleeve, driving means connected with said sleeve fo-roscillating it, means for alternately locking said spindle to said sleeve and support, whereby the blank is indexed, a spindle mounted on said support and carrying a tool, a thrust member slidably mounted on said support and arranged to engage with an element of said drive means to stop it at a predetermined position of said blank, and means actuated by said driving means for moving said thrust member step by step into operating position.

23. In apparatus of the class described, the combination with a frame, of a spindle rotatably mounted thereon and carrying a tool, a separate rotative spindle carrying a blank arranged to be engaged by the tool, means for rolling said blank spindle, a device for stopping the rolling of said blank spindle, said device being selectively movable to any predetermined position, and

means operable in harmony with the moveit ments of said work spindle for moving said device into operating position.

In testimony whereof, I have hereunto aflixed my signature.

CHARLES H. SCHURR.

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