US1261506A - Starting and stopping mechanism. - Google Patents

Description

A. F. FORBES.

Patented Apr. '2, 1918.

3 SHEETS-SHEET I.

M Ks

STARTING AND STOPPING MECHANISM.

APPLICATION FILED MAR. 11,1916.

A. F. FORBES.

STARTING AND STOPPING MECHANISM.

APPLICATION FILED MAR. 17. 1916.

Patented Apr. 2, 1918.

3 SHEETS-SHEET 2- Fig.2.

A. F. FORBES.

STARTING AND STOPPING MECHANISM.

APPLICATION FILED MAR. 17, l9l6.

Patented Apr. 2, 1918.

3 SHEETS-SHEET 3.

STATES P' ALBERT F. FORBES, OF BEVERLY, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGN- MENTS, T0 UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW JERSEY,

A CORPORATION OF NEW JERSEY.

STARTING AND STOPPING MECHANISM.

Specification of Letters Patent.

Patented Apr. 2, 1918.

To all whom it may concern:

Be it known that I, ALBERT F. FORBES, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain Improvements in Starting and Stopping Mechanisms, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to mechanism for starting and stopping the rotation of a driven shaft and is more particularly con cerned with what may be termed a selective revolution clutch mechanism.

Various machines are used to perform successive and similar operations upon a single piece of work, among others, machines for inserting eyelets or other fastenings and machines for marking buttonhole and button locations. With this type of machines, as at present equipped, a plurality of successive operations involves repeated treadlings, as when a one-cycle clutch is tripped by the machine operator for each successive operation performed on the work. The number of operations upon different pieces of work will vary, and accordingly, a plural revolution clutch mechanism is so constructed as to enable the operator to adjust the mechanism to produce the specific number of shaft revolutions necessary to meet the requirements of each particular case.

I have provided a clutch mechanism embodying parts arranged by adjustment to impart a selected number of revolutions to a driven shaft. My invention is herein described as embodying clutch mechanism automatically operative to efiect the disengagement of a clutch to stop a driven shaft upon the completion of a selected number of revolutions of said shaft predetermined by adjustment of revolution controlling means prior to the tripping of the clutch to start the revolution of the driven shaft.

One feature of the invention comprises in combination with a driving member and a shaft to be rotated thereby, a clutch device operative to drive the shaft, and mechanism operative automatically to disengage the clutch and controlled, as to time of disengagement, through certain conveniently located and manually adjustable means arranged so that the clutch may be disengaged and rotation of the shaft stopped at the end of one or more revolutions at the will of the operator and through a single readily effected adjustment.

Such an arrangement is a great desideratum, for the operator may, by a single and quickl effected adjustment, adapt the mechanism for automatic operation within a relatively wide range, and, obviously, the maximum number of permissible revolutions may be arranged to suit the maximum needs for any particular field of use.

Since this is the case, it will be apparent that another feature of advantage possessed by the invention, is the arrangement and construction of mechanism which requires no change in its parts to secure variance in the number of automatically controlled revolutions.

Another feature of the invention to which attention is directed, is the construction of revolution controlling mechanism operating in synchronism with the driven shaft and permitting accuracy in the timing of the operation of the automatic control.

The novel construction and arrangement of the parts by which these results are attained, constitute other features of the invention, and with the features hereinbcfore pointed out, are more particularly described in the detailed description following, and in the claims.

The accompanying drawings forming part of this specification illustrate one and a preferable embodiment of the invention.

In these drawings- Figure 1 is a front elevation of a clutch mechanism embodying the present invention,

Fig. 2 is an end elevation with the driving pulley removed, its clutch members being indicated in dotted lines,

Fig. 3 is a fragmentary perspective view of the clutch yoke, sleeve and adjusting de vice,

Fig. 4: is a fragmentary view of the driving pulley partly broken away'to disclose the clutch parts,

Fig. 5 is a longitudinal vertical section through the pulley and clutch sleeve, and

Fig. 6 is a detail view of the clutch pin dog and retracting rod.

A driven shaft 2 extends from the end of a frame 4 of any suitable machine and has loosely mounted upon its end a pulley 6 designed to be continuously rotated throu h suitable power transmission devices which need not be shown or described herei The inner central face of the pulleyis recessed and is provided with certain clutch parts hereinafter described. A sleeve 8 is secured to the shaft 2 to rotate therewith and has an end collar 10 of substantial. width. The outer end of this collar extends within the recessed inner face of the pulley 6 with clearance between the inner face and periphery of the pulley and the collar. The portion of the collar extending inwardly from the pulley is provided with threads 12 which act as a screw feed for certain revolution controlling means,

The collar 10 is bored transversely to receive a clutch pin 14 whose outer end is formed with a flat clutching face and which extends inwardly from the collar 10 and is provided with a reduced end 16. The transverse bore in the collar is formed with a lateral extension housing a coiled spring 20 acting against. a lateral extension 22 from the clutch pin 14 and normally tending to slide the clutch pin outwardly toward the adjacent faceof the pulley 6 and into the path of rotation of opposed clutch studs 24 secured to and. projecting from the inner face of the pulley and preferably having fiattenedcontact faces to cooperate with the flattened end of clutch pin 14.

The inner reduced end 16 of the pin carries a curved dog 26 having a bore to receive the pinand formed with an inwardly shouldered key portion 28 extending in a guide slot 30 formed in and extending longitudinally of the sleeve 8. Preferably the inner face of the key portion is curved to conform to the curvature of the periphery of the shaft 2 and will bear against the shaft. The outer face of the dog 26, that is, the face adjacent to the collar 10, is formed with a cam surface 32 terminating in a stop shoulder 34. The dog 26 with its cam affords a means for retracting the clutch pin to stop the revolution of the driven shaft.

Accordingly, the base of the machine frame may be provided with a suitable offset 36 forming a guide for a vertically extending, clutch retracting rod 38 positioned in vertical alinement with the cam 32 of the clutch dog 26. This rod normally tends to move upwardly to a position in which it will engagethe cam surface 32 as the dog and sleeve rotate and will act against the cam surface, forcing the dog26 andclutch pin inwardlyor to the left, Fig. 1, out of clutching engagement with the pulley 6, and finally contacting with the stop shoulder 34 to arrest further rotation of the shaft 2. In order to move the rod 38 upwardly to clutch retracting position a suitable spring 40 may be seated in a socket formed in the'ofl'set 36 and operate against a hold down block 42 seated over the rod 38 at a point a short distance above the offset 36. This block is fixedly secured to the rod and the spring 40 operating against the block normally tends to move the clutch retracting rod 38 upwardly to a position to engage the cam 32 as described.

This clutch retracting rod may be moved downwardly to permit the dog and clutch pin to be moved outwardly to bring the clutch pin into clutching engagement with a pulley stud 24 by any suitable means such as a treadle (not shown) operatively connected with the rod. When this treadle is released, the spring 40 will normally return the upper end of the retracting rod 38 to a position to engage the cam 32 and retract the clutch pin and stop the shaft 2 at the end of one revolution. This much of my clutch construction is in the nature of a one revolution clutch. v

To secure clutch retraction at the end of a selected number of revolutions of the driven shaft 2, it is necessary to provide means to hold down or latch the clutch retracting rod against movement to clutch rement 48 having a vertical bore therein. through which the rod 38 is guided. At the.

opposite sides of this enlargement the upper ends of bifurcated arms 50 of a hold down latch are pivotally mounted, these ams at their junction forminga nose 52 whose lower edge. is adapted to engage the shoulder 44 of the hold down block when the rod 38 isdepressed to release the clutch sleeve. This lower end of the latch is normally pressed in a direction. to snap over the shoulder 44 by means of a coiled spring 54 seated in a socket formed in the flange 46. At a point above its nose 52 one arm 50 is provided with a laterally offset abutment 56 designed to be engaged and moved to release the, hold down latch from engagement with the shoulder 44 and permit the retracting rod 38 to spring upwardly in a position to engage the cam 32 and retract the clutch pin.

The movement of the offset 56 to effect release of the clutch retracting rod 38 is effected through mechanism coiiperating with and controlled by rotation of the driven shaft. Conveniently, a yoke formed by arms 58, 60 has its lower end bifurcated and pivotally mounted at opposite sides of the block 42, at the outer end of the block, which is reduced transversely at this point to position the outer faces of the bifurcations sub stantially flush with the block. The arms of the yoke embrace the shaft with its sleeve and flange and terminate at a point above the threaded portion 12 of the flange. The upper ends of these arms are integrally connected and bifurcated similarly to the lower ends of these arms. One end of a plate 62 is pivotally mounted between the bifurcated portions and extends outwardly in the direction of the pulley. The yoke at a point below the bifurcation and below the plate 62 is provided with an upwardly offset stop 64 to limit the downward movement of the plate 62. This plate will normally be held against this abutment by gravity, but preferably a spring 66 is provided to operate against the plate to hold it yieldingly in engagement with the abutment. The outer end of the plate 62 has detachably secured thereto a finger 68 preferably having a tongue engaging in a groove in the plate, the lower end of the finger being beveled to a point and having its beveled face corresponding to the bevel of the screw threads 12.

At its lower end, the yoke 57 is formed wth a threaded bore to receive a contact screw 70 designed to engage the offset abutment 56 after the rod 38 is pulled downwardly and latched. Preferably, a check nut is provided to retain the screw in adjusted position. Below the contact screw 70 and at the opposite side of the bifurcation, the yoke is provided with an offset finger 72 having a socket therein to receive one end of a coiled spring 74 seated against the face of the block 42 and normally tending to swing the yoke outwardly or toward the right in Fig. 1.

It will be evident that when the retracting rod 38 is depressed to release the dog 26 and permit the clutch pin to move into clutching position, the toe 52 of the latch will engage the shoulder 44 of the hold down block and prevent the retracting rod from rising under the influence of its spring 40. WVhen the rod 38 is depressed to release the clutch the yoke 57 will be moved downwardlyto bring the edge of its tooth 68 into engagement with one of the threads 12 of the sleeve flange and the contact screw will be positioned in line with the abutment 56 of the latch. As the shaft rotates, the sleeve 8 with its threaded flange 12 will also rotate, and as the sleeve and flange are fixed to the shaft, the threads 12 will feed the finger 68 and the yoke by which it is carried inwardly, or toward the left in Fig. 1, moving the contact screw 7 O to engage the abutment 56 and slide the nose 52 of the latch beyond the hold-down shoulder 44 on the rod-carried block 42, thereby releasing the rod and permitting it to spring upwardly to engage the cam 32 and retract the clutch pin, as described. The particular thread 12 engaged by the finger 70 will determine the amount of movement imparted to the yoke and to the contact pin. Each complete revolution of the driven shaft will impart a complete revolution to the threaded flange 12 and will move the finger 68 and yoke a determinate distance. From the standpoint of clutch control, each revolution of the threaded flange is equivalent to a revolution of the driven shaft. The threaded portion of the flange as illustrated, is pro vided with six threads. Engagement of the tooth 68 with the outermost or sixth thread when the rod 38 is depressed will permit the latch 50 to engage and hold down the rod 38 during five complete revolutions of the driven shaft and for part of the sixth revolution. At approximately the time when the tooth 68 reaches the first or innermost thread, the end of the contact screw 7 0 will engage the abutment 56 and will begin to move the nose 52 of the latch from the stop shoulder 44. The rate of movement of the contact screw, the amount of overlap of the latch nOse 52 and shoulder 44, and the time of contact of the screw with the latch are relatively adjusted to insure the release of the clutch retracting rod 38 at a point in the last cycle when the upper end of the rod will spring up into engagement with the beginning or low part of the cam surface 32 of the dog 26, so that the clutch pin will be withdrawn and the driven shaft stopped from further revolution at the end of its complete cycle when the stop shoulder 34 engages the rod 38. As the threaded flange 12 does not begin to revolve until the driven shaft is clutched to the pulley, it is evident that the threads 12 can cotiperate with the contact screw to secure determinate results. It will also be evident that if the yoke is positioned to engage the tooth 68 with the fifth, fourth, third, etc., threads 12, the retracting rod may be released to stop the revolution of the driven shaft at the end of the fifth, fourth, third, etc., revolution thereof.

For positioning and holding the finger 68 for engagement with a selected thread groove an adjusting lever 76 is pivotally mounted adjacent to one end on a bracket 78 extending from the machine frame 4 and has its inner end positioned to engage the outer edge of the arm 58 of the yoke, that portion of the arm engaged by the lever when the yoke is pulled downwardly with red 38 being offset to lie in a vertical plane and terminating in a shoulder 59. When the yoke is pulled downwardly by depression of the retracting rod 38 the yoke 57 with its tooth 68 will move in a vertical line to engage with accuracy the thread 12 over which the tooth is positioned by adjustment. At the end of the downward movement, the

. particular bore.

shoulder 59 passes beneath the lever end and permits sprin g 74 to press the tooth 68 outwardly against the guiding wall of the next adjacent thread.

Determinate adjustment of the lever is secured by providing its outer end with a threaded pin cooperating with a series of threaded bores 82 formed in the arm of a bracket an outstanding from the frame of the machine. Preferably, suitable indication marks, such as the numerals 1, 2, 3, etc, are placed adjacent to the bores to indicate the groove and number of revolutions secured by the engagement of the pin 80 with the The action of the coiled spring 7r against the yoke holds the outer edge of the yoke pressed against the inner end of the adjusting lever until the clutch pin is released to start the revolution of the driven shaft. As the threaded flange 12 is revolved with the shaft, the screw threads feed the tooth 68 to the left (Fig. 1) and move the yoke away from the lever. The yoke, however, is immediately returned into engagement with the lever by spring 74 when the latch is operated to release the rod 38 and the yoke and tooth are lifted with said rod.

Briefly, the operation of the described mechanism is as follows: The lever 76 is first adjusted to position the yoke in its tooth for the desired number of revolutions. The treadle or other instrumentalities is then operated to pull down the rod 38, engaging the tooth 68 with the specific thread 12 selected for a given number of revolutions, latching the rod against upward movement and at the same time positioning the contact screw 70 in line with the abutment 56 with the latch. As soon as the clutch pin 1% engages the clutch stud 2%, the threaded flange will begin to revolve with the driven shaft and will gradually move the tooth 68 initially or toward the left in Fig. 1 until the screw 7 O engages the offset 56 and moves the nose 52 of the latch out of engagement with thehold down shoulder at of lock 42. Thereupon, the rod 38 will spring upwardly to engage the cam 82 of the dog 26 retracting the clutch pin l-i stopping the shaft at the end of the selected number of revolutions. The frictional resistance occurring when the rod 38 acts against the spring pressed cam surface 32, provides an effective braking medium which will obviate injurious shock to the operating parts when the rod contacts with the cam shoulder 34- to stop further rotation of the driven shaft.

Having thus described my invention, what 1 claim as new and desire to secure by Let ters Patent of the United States is 1. A. device of the class described, having in combination, a driving member, a shaft arranged to be driven thereby, a clutch movable operatively to connect the driving rection operatively to connect said member and shaft, means normally tending to move to a position to retract and hold said clutch member in inoperative position, and mechanism arranged to hold said retracting meansagainst operative movement and subsequently and automatically to release said retracting means to effect retraction of the clutch member and to stop the rotation of the driven shaft at the completion of a selectively variable predetermined number of revolutions of said shaft.

3. A device of the class described, having in combination, a driving member, a shaft to be oriven thereby, a movable clutch member normally tending operatively to connect the driving member and shaft, a clutch retracting member arranged and normally positioned to retract the clutch member and to hold said clutch member and shaft against operative movement, manually operable means to withdraw said retracting member to permit operation of the clutch member, latching means cooperating with said retracting member automatically to latch said member, when withdrawn, against movement to clutch-retracting position, and mechanism operative in synchronism' with the driven shaft and cooperating with the latching means automatically to release the retracting member and to stop rotationof the driven shaft at the completion of aselectively variable predetermined number of revolutions.

4:. A device of the class described, having in combination, a driving member, a shaft arranged to be rotated thereby, a movable clutch member normally op rative to connect the driving member and shaft, a retracting device normally tending to move to a position to retract the clutch member, latching means to hold the device in inoperative retracting position, and controlling mechanism for the latching means including a member adjustable to variable initial positions and automatically movable in synchronism with the driven shaft to operate the latching means to release the retracting device and stop rotation of the driven shaft at the completion of a selectively variablenumber of revolutions predetermined by initial adjustment of said' member.

5. A device of theclass described, having in combination, a driving member, a shaft arranged to be rotated, a movable clutch member normally operative to connect the driving member and shaft, a retracting device normally tending to move to a position to retract the clutch member, latching means to hold the device in inoperative retracting position, and controlling mechnism for the latching means including an element movable in synchronism with the driven shaft and means manually adjustable to variable initial positions of cooperation with said movable element and automatically operative to effect the release of the retracting device and the stopping of the driven shaft at the completion of the number of revolutions selectively predetermined by the initial manual adjustment of said means,

6. A device of the class described, having in combination, a driving member, a shaft arranged to be rotated, a clutch member movable operatively to connect the driving member and shaft, a retracting device normally tending to move to retract the clutch member and stop rotation of the driven shaft, latching means to hold the retracting device in inoperative position, and controlling mechanism for the latching means including a releasing member automatically movable relatively to the latching means in synchronism with the driven shaft, with means initially to position said member for effective latch releasing movement at dis tances from the latching means predetermined by the number of revolutions to be imparted to the driven shaft.

7. A device of the class described, having in combination. a driving member, a shaft arranged to be rotated, a clutch member movable operatively to connect the driving member and shaft, a retracting device normally tending to move to retract the clutch member and stop rotation of the driven shaft, latching means to hold the retracting device in inoperative position, and controlling mechanism for the latching means including a part rotatable in synchronism With the driven shaft, a cooperating latch releasing member automatically movable in synchronism with said driven shaft and arranged manually to be positioned at variable initial distances from said latching means predetermined by the number of revolutions to be imparted to the driven shaft.

8. A device of the class described having, in combination, a driving member, a shaft arranged to be driven thereby, a movable clutch member normally tending operatively to connect the driving member and shaft, a clutch retracting member normally tending to move to a position to retract sald clutch member and stop the revolution of the driven shaft, alatching device operative automatically to latch the retracting member inoperative position, a movable latch releasing member, a part rotated by the driven shaft, connections between the releasing member and rotating part arranged to adjust-ably engage said part to position the releasing member at difierent distances from the latching device for different numbers of revolutions of the driven shaft determined by the point of engagement of said connections with the rotating part, with means operated by .the rotation of said part to move said connections and releasing member to release the clutch retracting member.

9. A device of the class described having, in combination, a driving member, a shaft arranged to be rotated thereby, with a clutch member movable operatively to connect the driving member and shaft, and means operative automatically to effect movement of the clutch member to retracted position including a threaded member r0- tating synchronously with the driven shaft and clutch controlling mechanism manually adjustable prior to initial movement of the shaft to engage different portions of the threaded member for clutch retraction at the end of different numbers of revolutions of the driven shaft and actuated by the revolution of the threaded member to effect clutch retraction at the time predetermined by such initial adjustment.

10. A device of the class described having, in combination, a driving member, a shaft arranged to be rotated thereby, with a clutch member movable operatively to connect the driving member and shaft, a clutch retracting member normally operative to move to clutch retracting position, a latch to hold the retracting member in inoperative position, and means operative automatically to effect release of the latch and retraction of the clutch member including a threaded member rotating synchronously with the driven shaft and latch releasing mechanism manually adjustable prior to initial movement of the shaft to engage different portions of the threaded member for latch release and clutch retraction at the end of different numbers of revolutions of the driven shaft and actuated by the revolution of the threaded member to effect latch release and clutch retraction at the time predetermined by such initial adjustment.

11. A device of the class described having, in combination, a driving member, a shaft arranged to be rotated thereby, with a clutch member operative to connect the drlving member and shaft, a movable clutch retracting member normally tending to engage and retract the clutch member from operat ve position and arranged for manual operation to release the clutch member for movement to operative position, a latch arranged to i hold the retracting member in inoperative ranged to be adjustably positioned relatively to the latch for movement toward the latch to engage the latch and release the retracting member, with a screw feed for said releasing member operating in synchronism with the driven shaft.

12. A device of the class described having, in combination, a rotatable driving member, a shaft to be rotated thereby, a sleeve secured to the shaft to rotate therewith and having a spiral feed groove therein, a movable clutch member carried by the sleeve and normally tending to move to connect the driving member and shaft for simultaneous rotation, a movable rietractii'lg member arranged to cooperate with the clutch member normally tending to move to a position to retract said clutch member and to stop the-revolution of the driven shaft, manually operable means to move the retracting member to inoperative retracting position to permit movement of the clutch to eifect rotation of the shaft, a latch operative automatically to hold the retracting member in moperative position, and a latch releasing member arranged to be adjustably positioned for movement relatively to the latch,-and means cooperating with said spiral feed groove to feed said releasing member toward the latch synchronously with the rotation of the driven shaft.

13. A device of the class described having, in combination, a rotatable driving member, a shaft to be rotated thereby, a sleeve secured to the shaft to rotate therewith and having a spiral feed groove therein, a movable clutch member carried by the sleeve and normally tending to move to connect the 1 driving member and shaft for simultaneous rotation, a movable retracting member ar ranged to cooperate with the clutch member and normally tending to move to a position to retract said clutch member and to stop the revolution of the driven shaft, manually operable means to move the retracting member to inoperative retracting position to permit movement of the clutch to efieot rotation of the shaft, a latch operative automatically to hold the retracting member in inoperative position, a movable latch retracting mem her, a finger arranged to be manually positioned for engagement with different portions of the feed groove when said clutch member is released and said shaft rotated, and connections between said finger and said releasing member to position the latter at distances from the latch varying with the adjusted positions of said finger and to feed said releasing member toward the latch as the finger is moved by rotation of the threaded sleeveand driven shaft.

14:. A device of theclass described having, in combinati n, retat ble driving member, a shaft te be rotated thereby, sleevesecured to the to rotate therewith having a threaded peripheral portion and having a movable clutch member rotating therewith and provided with a retracting abutment, means normally tending to position said member for clutching engagement with the driving member, a movable retracting rod constructed and normally tending to move to cooperate with said clutch retracting abutment to retract the clutch member to and hold it in inoperative position and to stop rotation of the driven shaft, said rod being arranged for manually efi'ected move in ent to release the clutch member for move ment to clutching position, a latch. arranged automatically to hold said rod against re turn movement to clutch. retracting position, a latch releasing member arranged to be spaced from the latch for movement toward the latch to engage and move the latch to release the clutch retracting rod, a finger ar ranged to be manually positioned for engagement with selectively different portions of the threaded periphery of the'sleeve when the retracting rod is manually operatedto release the clutch and supported for movement longitudinally relative to the sleeve by rotation of its threaded periphery, and connections between said finger and the latch releasing member operative by said longitudinal movement of the finger to move the releasing member toward the latch.

15. A device of the class described having, in combination, a driving member, a shaft arranged to be rotated thereby, with a movable clutch member operative to connect the driving member and shaft, a clutch control- I ling mechanism arranged to be manually operated to effect movement of the clutch member to start the revolution of the shaft and normally operative automatically to ef fect retrction of the clutch and to stop the shaft at the end of one revolution, with means cooperating with said mechanism automatically to block clutch retraction and automatically and subsequently to effect clutch retraction and to stop the driven shaft at the completion of a selectively variable plurality of shaft revolutions.

16. A device of the class described having, in combination, a driving member, a shaft arranged to be rotated thereby, with a movable clutch member operative to connect the driving member and shaft, a clutch controlling mechanism arranged to be manually operated to effect movement of the clutch member to start the revolution of the shaft and normally operative automatically to effect retraction of the clutch and to stop the shaft at the end of one revolution, with means cooperating with said mechanism automatically to block clutch retraction and automatically and subsequently to effect clutch retraction and to stop the driven ing manually adjustable instrumentalities for selectively predetermining the number of said plurality of revolutions.

17. A device of the class described having, in combination, a driving member, a shaft arranged to be rotated thereby, with a movable clutch member operative to connect the driving member and shaft, a clutch controlling mechanism arranged to be manually operated to effect movement of the clutch member to start the revolution of the shaft and thereafter normally operative automatically to effect retraction of the clutch and to stop the shaft at the end of one revolution, a latch cooperating with said mechanism automatically to hold the same against clutch retracting movement to permit continued revolution of the shaft, with timing mechanism cooperating with the latch automatically to release said clutch controlling mechanism for clutch retracting action at the completion of a predetermined number of revolutions.

18. A. device of the class described having, in combination, a driving member, a shaft arranged to be rotated thereby with a 1novable clutch member operative to connect the driving member and shaft, a clutch controlling mechanism arranged to be manually operated to effect movement of the clutch member to start the revolution of the shaft and thereafter normally operative automatically to effect retraction of the clutch and to stop the shaft at the end of one revolution, a latch automatically to hold the said controlling mechanism inoperative to effect clutch retraction, and means for controlling the latch including a releasing member movable automatically to operate the latching means to release the clutch-controlling mechanism for retracting action, with manually adjustable means cooperating with the movable releasing member and with the driven shaft to operate the releasing member in synchronism with the driven shaft to effect retraction of the clutch and to arrest revolution of the driven shaft at the completion of the number of revolutions thereof predetermined by the manual ad ustment of the said cooperating means.

19. A device of the class described having, in combination, a driving member, a shaft arranged to be rotated thereby, with a movable clutch member operative to connect the driving member and shaft, a clutch controlling mechanism arranged to be manually operated to effect movement of the clutch member to start the revolution of the shaft and thereafter normally operative automatically to effect retraction of the clutch and to stop the shaft at the end of one revolution, a latch arranged automatically to hold said clutch controlling mechanism against clutch retracting action, and latch operating means including a releasing member movable relatively to the latch, with means to position the releasing member for effective latch releasing movement at distances from the latch varying with the number of revolutions to be imparted to the driven shaft.

20. A device of the class described having, in combination, a driving member, a shaft arranged to be rotated thereby, with a movable clutch member operative to connect the driving member and shaft, a clutch controlling mechanism arranged to be manually operated to effect movement of the clutch member to start the revolution of the shaft and thereafter normally operative automatically to effect retraction of the clutch and to stop the shaft at the end of one revolution, a latch arranged automatically to hold said clutch controlling mechanism against clutch retracting action, and latch operating means including a releasing member movable relatively to the latch, with means to position the releasing member for effective latch releasing movement at distances from the latch varying with the number of revolutions to be imparted to the driven shaft, and with connections from the releasing member to a part rotating in synchronism with the driven shaft adjustable relatively to said rotating part for different numbers of revolutions of the driven shaft.

21. In a starting and stopping mechanism having a normally operative clutch and a retracting member for the clutch, controlling means for the retracting member ineluding an element arranged for manually effected movement to variable revolution controlling initial positions and subsequently and automatically movable in synchronism with the driven shaft to stop the driven shaft at the end of the number of revolutions predetermined by the initial selective adjustment of said controlling element.

22. In a starting and stopping mechanism having a clutch retracting member normally tending to operate and a latching device to hold said member against clutch retracting movement, a controlling means arranged for manually effected movement to variable initial positions relatively to the latching device and automatically movable in synchronism with the driven shaft to release said retracting member and to stop the driven shaft at the completion of the number of revolutions selectively predetermined by the manually effected initial adjusting movement of the controlling means.

23. In a starting and stopping mechanism having a normally operative clutch and a retracting member for the clutch, controlling means for the retracting member including a feed member movable in synchronism with the driving shaft and a controlling element arranged for manually eflected adjustment to variable selective revolution controlling ,positions of engagement with said feed member prior to actuation of the driven shaft and automatically movable in synchronism with said shaft to stop said shaft at the end of the number of revolutions predetermined by the initial selective adjustment-of said controlling element.

24- In a starting and stopping mechanism having a normally operative clutch and a clutch retracting member, a controlling means cooperating With said retracting member comprising a threaded member rotatable in synchronism with the driven shaft and a traction and the stopping of the shaft at the completion of the number of revolutions selectively predetermined by the initial adjustment of said controlling element.

In testimony whereof I have signed my name to this specification.

ALBERT F. FORBES.

Games of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, B. 3.

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