US2607457A - Driving mechanism for one revolution clutches - Google Patents

Description

1952 F. B. KEALL 2,607,457

DRIVING MECHANISM FOR ONE REVOLUTION CLUTCHES Filed April 4, 1946 16 lwveniar .FTQTZK By his fifzovmey 9M 15, MM

Patented Aug. 19, 1952 DRIVING MECHANISM FOR ONE REVOL'UTION CLUTCHES Frank Bycroft Keall, Leicester, Eng land, assignor to United ShoeMachinei-y Corporation, Flem ington, N. J., a corporation of New Jersey Application April 4, 1946, Serial No. 659,566

In Great Britain Aprilll, 1945 (iClaims. (o1. 192-26) This invention relates to driving mechanism and is herein illustrated as embodied in a press of the type disclosed in United States Letters Patent No. 921,503, granted on May 11, 1909, upon an application filed in the name of Arthur Bates.

. Presses of the type referred; to commonly comprise anarm mounted upon a vertical spindle for movement laterally over a cutting block and for movement heightwise of the cutting block in performing pressure applying operations upon dies positioned upon material located upon the block for producing blanks from the material. The spindle of such a machine is operated from a drive shaft arranged to be connected to a flywheel by a one-revolution clutch. It is an object of the present invention to provide improved driving mechanism for machines of this type which, while effective to drive the shaft positively thus to insure completely cutting through sheet material upon the action of the arm upon a die, will be capable of starting the shaft from rest without undue shock or noise.

To this end and as shown, thereis provided a press having a drive shaft and a flywheel to-v gether with a yieldable block -associatedwith the flywheel and arranged to be movable with the accompanying drawings and are pointed out in,

the claims. v

In the drawing, the figure is an end view, partly in section,.of a portion of the flywheel and clutch mechanism of a press illustrating one embodiment of the invention. v

By way of example the drawing illustrates the invention as applied to clutch mechanism for use in machines of the press type such as that disclosed in the aforementioned United States Letters Patent. s

The mechanism shown comprises a drive shaft I2 having a hub I4 and a flywheel l6 which is arranged to drive the shaft through mechanism hereinafter described.

To this end, the hub has a recess l8 in which is positioned a clutch bolt.20 slidably mounted for movement at right angles to a radius of the shaft. The clutch bolt is normally forced outmay by a sprin s: an d is condoned by a trip ping mechanism, not shown in detail, and including a cam 24. Any suitable tripping mechanism may be employed, the only requirements being that there be provision for moving the cam into the dotted line position shown for the purpose of engaging the outerend of the bolt 20 to move it into inoperative position after a single I In order to drive the shaft at the proper time the flywheel is provided with mechanism mov-' able into engagement with a face 26 on the bolt. This mechanism comprises a block 28 slidably mounted in a segmental housing 30 secured by bolts 3| to the flywheel. The block has a face 32,

arranged to engagethe face 26 of the bolt and circumferentially arranged faces 34 arranged slidably to engage the inner surface of a rim 36 forming part of the housing and constituting a guide member for directing the block angularly about the axis of the flywheel. Movement of the block 28in a counterclockwise direction is limited by'engagementl of a flat surface 38 on arecessed portion of. the ,block' with a stop 4!] projecting from the housing, of the flywheel.

The block 28 is normally pressed against a stop 4| on the'housing by a toggle comprising a heavy spring 42,0n end of which is seated in a bore 44 in the block and the other end of which is supported bya shouldered stem piece 46 having a reduced portion 48 resting upon a pin 50 mounted in 'a recess 52in a lever 54 which in turn is pivoted upon a stud'56 on the flywheel. A light tension spring 58 connected'between a hook 60 on the lever'54and a pin 62 on the flywheel limits outward movement of the lever 54 about its pivot 56.

Mounted upon the frame of the machine so as to be stationary with respect to the flywheel I6 is a stud 64 carrying a roller 66 and slightly spaced therefrom is a cam plate 68 forming part of the frame. The lever 54 has an outer curved nose portion 10 arranged .to engage the roll 66 at the endofa revolution of the flywheel, with the result that the lever is rotated inwardly about its pivot 56, causing the spring to force the block 28 against the stop 4l. The cam 68 isfshaped to permit gradual outward movement of the lever after it passes 'olf' the'roll 66, thus to reduce the pressure of the spring 42 upon the block so that the latter is free to move toward the stop 46;

The drawing shows the mechanism with the parts in the position in which the bolt has just been released by the cam 24 and has been thrust by the spring 22 into the path of movement of the block 28 rotating, with the flywheel in .a clockwise.

direction, the face 32 of the block "having just contacted with the face 26 of the bolt. The

shock of engagement of the moving block with l the bolt 29 is cushioned by the spring 42 which is compressed as the block moves relatively tothe flywheel until the face 38 on the block contacts with the stop 40 on the housing. During the along the cam plate 68, the spring 42 pushes the lever 54 gradually outwardly of the flywheel against the pull of the light spring 58. The tendency of-the spring 42 to react suddenly, causing chatter between the block 28 and thebolt 2-0 is thus eliminated and the driving force of the flywheel upon the bolt 20 will be continued through the block 28 with the face-38 of the block and face 4'8 ofthe housing in contact, thus constituting a positive drive. At the end of a revolution of the flywheel and shaft, the bolt 20 will automatically be withdrawn by operation of theta-m 24', and the lever 54 will have been brought around so that its curved end portion 'Hl'will again engagetheroller 66 andcause the lever tobepressed inwardly by the roller into the position shown in the drawing, the return of the various partsto' the positions shown being aided, by the spring 58;

it will be seen that themechanism above described will operate to facilitate connection between a stationary shaft and a rotating flywheel with' an initial yielding of parts followed-by a positive drive of the shaft bythe flywheel:

Having described my invention, what I claim asnewanddesire to secure by Letters Patent of the United States is:

' 1}. In a one revolution type driving mechanism, a;' drive shaft; a hubron the shaft, a flywheel-mounted coaxiall'y" of the shaft, a housing secured: to the flywheel a'ndextending circumferenti'ally of the hub, a block slidably mounted in the housing, aclutch part mounted in the hub andjm'ovable outwardly thereof into the path of movement of the block, the block" oppositely disposed faces;, a resilient means normally operative to force the block against one of thestops ina direction toward the clutch part, and means" for releasing the resilient means to providefo'r the positive engagement of the block with the'cther stop afterthe" block has engaged the clutch-part.

2; In"a one revolution typ'e' driving mechanism, a drive shaft, a hub on the shaft, a flywheel mounted coaxially of the shaft, a housing carried by the flywheel andarranged circumferential ly ofthe' shaft, a blockslidably mounted in the housing, a clutch part slidably mounted ihvthe' hubfor movement into the path of movement of the block, a, lever pivotallyl carried by the fl'y-' wheel; a spring extending from one end' ofthe lever into engagement with the block and'n'ormally operative to force the block in a clockwise direction} means operable upon rotation of the flywheel to release the pressure of the spring, thereby to provide for movement of the block in a counterclockwise direction relative to the housing, and means associated with the flywheel for positively arresting counterclockwise movement of the block. 7

3. In a one revolution type driving mechanism,

a drive shaft, a hub on the shaft, a flywheel mounted coaxially of the shaft, a plurality of spaced, stops carried by the flywheel, a block slidably mounted upon the flywheel for move- 1 -=ment between the stops, a clutch part slidably mounted in the hub for movement into the path of movement of the block, a spring-pressed toggle pivotally mounted upon the flywheel and having one end thereof connected to the block for forcing the block toward one of the stops, a cam for maintaining the toggle in straightened condition during the initial-part of a cycle of movement'of the flywheeLand means for releasing the toggle, thereby to provide for movement of the block into engagement with the'other stop;

4.- In a-one revolution type driving mechanism, a drive shaft, a hub on the shaft, a flywheel mounted coaxially of the shaft, a plurality of spacedstops carried by the flywheel, a block slidably mounted upon the flywheel for movement between the stops, a clutch part slidably mounted in the hub formovement into the path of movement of the block, resilient means normally op--- erative to force the block toward one of the stops, and means for relieving the resilient means subsequently to engagement of the block with the clutch part thus to providefor movement of the block into positive engagement with the other ofthe stops.

a 5"; In aone revolution type driving mechanism,

a' drive shaft, a hub on the shaft, a flywheel I mounted coaxially of the shaft, a plurality of spaced's'tops'carried by the flywheel, a block slidably mounted upon theflywheel for movement between the stops, aclutch part slidably mounted in the hub for movement into the path of movement of the block, resilient means normally operative to force the block into engagement with one of the stops, cam-controlled means for releasing the resilient means subsequently to engagement-of the blockwith the clutch part to provide for movement of the block into positive engagement with the other of the stops, and meansfor rendering the resilient means again operative after a single revolution of the drive shaft.

6. In a one revolution type driving mechanism, a drive shaft; a hub on the shaft, a flywheel mounted:coaxiallyofthe' shaft, a block slidably" mounted-on the flywheel'for angular movement about the axes of the flywheel and shaft, a clutch REFERENCES CITED The following references are of' record in I the file of this patent:

FOREIGN PATENTS Number Country Date- Australia Nov. 20, 1934

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