US1967600A - Paper cutting machine - Google Patents

Description

July 24, 1934. R. s. TYLER ET AL 1,967,600

PAPER CUTTING MACHINE Filed Feb. 26, 1932 2 Sheets-Sheet l INVENTOR.

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PAPER CUTTING MACHINE Filed Feb. 26, 1952 2 Sheets-Sheet 2 n. u. I"

I INVENTOR.

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Patented July 24, 1934 UNITED STATES PATENT OFFICE PAPER CUTTING MACHINE tion of Ohio Application February 26, 1932, Serial No. 595,288 4 Claims. (01 164 -54) This invention relates, as indicated, to paper cutting machines, but has reference more specifically to a heavy duty power driven machine, wherein a. clamp is employed to clamp the pile of 5 paper in advance of the cutting stroke of the knife and to maintain said pile in clamped condition during such cutting stroke and until the knife is withdrawn from contact with the pile.

In some paper cutting machines of this type, it has heretofore been the practice to employ for the purpose of applying additional pressure to the clamped pile of paper during a portion of the cycle of movement of the knife a friction box having plates whose resistance of movement to each other developed the desired additional pressure of the clamp.

Such devices, as a rule, embody pawl and ratchet operating mechanism, which is noisy and apt to get out of order, and have not been found effective to produce easily controllable heavy pressures, such as required for certain types of work. 7

A primary object of the present invention is to provide a device for use in a machine of the character described whereby heavy pressures may be applied to the clamp, and such pressures varied to meet different conditions. Another'object of the invention is to provide a friction box, the operative parts of which are silent. Another obembodying certain novel features, whereby the clamp of the machine may be operated at a speed greater than the speed at which it is operated by the friction box. A further object of the invention is to provide a friction box in which the pressure between the plates and the interposed cork rings may be readily variedby simple manual adjustments, and whereby the degree of pressure is visually indicated. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain mechanism {5 embodying the invention, such disclosed means Fig. 1 is a side elevation of a paper cutting machine embodying the present device; Fig. 2 is a side elevation of the friction box, with the cover plate removed to more clearly show some of the details; 3 is a cross-sectional view through $5 the friction box, taken on the line 3-3 of Fig. l;

ject of the invention is to provide a friction box,

Fig. 4 is a view similar to Fig. 2, but showing the brake band in tightened condition; Fig. 5 is a fragmentary detail of the roller drive; Fig. 6 is a fragmentarycross-sectional view, taken on the line 6-6 of Fig. 4; and Fig. 7 is a fragmentary view showing the pressure indicating dial.

Referring more particularly to the drawings, the paper cutting machine includes side members 1 and a bed or table 2. The side members 1 have slots -3 therein in which the knife bar 4 is mounted for vertical reciprocal movement, such movement being imparted by connecting rods 5, secured to cranks 6. The cranks 6 are secured to the ends of a transverse shaft 7, which by means of suitable gearing (not shown) is adapted to be driven by a shaft 8, which, in turn, is driven by a motor 9.

A hinder or clamp 10 is mounted for vertical reciprocal movement at the rear of the knife bar 4, and for this purpose is provided 'with side bars 11 slidable in suitable recesses in the side members 1. These side bars are connected at their lower ends by a cross-member 12, adjacent the ends of which are secured depending racks 13.

For the purpose of operating the clamp 10, an operating lever 14 is provided, which may be suitably manipulated to cause a rotation of the shaft 7 in a clockwise direction, as viewed in Fig. 1. As the shaft 7 revolves, a cam thereon (not shown) causes the clamp 10 to be depressed against the tension of springs tending to maintain it in elevated position, and the clamp is thus moved into engagement with the pile of paper to be cut.

For the purpose of applying pressure to the clamp in excess of that obtainable by the mechanism just described, I provide a friction box and operating mechanism therefor which will now be described.

A shaft 15 is suitably journalled in the side members 1 of the machine and has secured thereto pinions 16 which are in engagement with the racks l3 and thus cause movement of the clamp 10 when the shaft 15 is rotated.

Mounted adjacent one end of the shaft 15 so as to be freely rotatable thereon is a housing 17 having secured thereto a cover plate 18, the housing and cover plate being respectively provided with depending ears 19 and 20. Disposed within the housing 1'7 is a floating ring 21, which is adapted to be embraced by the lining 22 of a brake band 23 having terminal portions 24 and 25, which extend through a suitable aperture in the periphery of the housing.

Keyed to the portion of the shaft 15 which extends through the housing 1'7 are plates 26, portions of the opposed faces of which are cut away to receive other plates 27 having peripheral annular flanges 28. Disposed between the plates 26 and 27 are -rings 29 of cork or other suitable material having a high coefllcient of friction. The

flanges 28 of the plates 27 are cut away at circum ferentially spaced points to provide pockets or recesses 30, having tapered walls 31. Disposed within these recesses 30 are rollers 32, which serve a purpose which will be presently described.

Journalled in the cars 19 and 20 is a pin 33, to which are keyed levers 34, these levers in turn being pivotally secured to levers 35. The levers 35 are pivotally secured to the terminal portion 24 of the brake band 23, as by means of a pin 36. These levers form a toggle by means of which the brake band may be tightened into engagebrake band and straddles the pin 36 so as to accommodate the movement of this pin. An adjusting nut 39 and lock nut 40 are provided to make the necessary adjustment.

The pin 33- also has keyed thereto a lever 41, to-the other end of which is pivotally secured a rod 42. The rod 42 extends through a bracket 43 extending from the frame of the machineand mounted on this rod between a collar 44 thereof and the bracket 43 is a coiled spring 45.

The housing 17 is also provided with a depending portion 46, which supports a roller 47 which is in engagement with a cam 48 'keyed to the shaft '7.

For the purpose of increasing or decreasing the degree of pressure between the plates 26 and 27 and the cork rings 29, the following mechanism is provided:

The outer plate 26 is provided with a series of recesses 49 within which are disposed coil springs 50, the opposite ends of which are in abutment with a collar 51 mounted on the shaft 15 and movable axially thereof. Such axial movement for the purpose of increasing or decreasing the pressure between the plates 26 and 27 and the cork rings 29. may be obtained by means of a hand wheel 52, which is threadably secured to the end of the shaft 15. After the wheel has been moved to secure the desired pressure, it may be locked against accidental movement by means of, a pin 53 extending through the hand wheel and into one of the recesses 54 in the outer plate 26. A set screw 55 serves to prevent accidental withdrawal of pin 53.

For the purpose of visually indicating the de gree of pressure, a dial 56 is secured to the cover plate 18, and to this dial is pivotally secured a pointer 57 having a laterally extending portion 58 adapted-t6 be moved to rotate the pointer by 'means of a pin 59. The pin 59 is raised or lowered, depending on the direction of movement of the handwheel, by means of a tapered key 60, which is secured to the collar 51.

The operation of the friction box is briefly as follows:

As the cam 48 revolves in the direction indicated by the arrow in Fig. 1, the various parts are moved from the position shown in Fig. 1 to the poistion shown in Fig. 4. During this movement, the lever 41 causes the toggle comprising levers 34 and 35 to straighten out, thus tightening the brake band 23 about the ring 21. The ring is thereafter rotated, causing the rollers 32 to become wedged between the tapered surfaces 31 of the recesses 30 and the inner periphery of the ring, and rotate the plates 27. The plates 27 frictionally rotate the plates 26, which in turncause the shaft 15 and the pinions 16 to rotate, thus depressing the clamp 10, as will be readily understood. The resistance of the plates 26 to rotation creates the heavy pressure of the clamp 10 on the pile of paper thereunder.

As the cam 48 completes its revolution, the weight of the housing and the spring 45 causes the various parts to assume their initial position.

The roller drive for the plates 2'7 makes the operation of the friction box noiseless as compared with a pawl and ratchet drive.

It will be, noted that the ring 21 is floating and is only held tightly within the box itself when the brake band is tightened. At such time, the box will drive the clamp one way through the rollers, but does not prevent the clamp from traveling more rapidly than the box drives it. This permits the clamp pull-down mechanism which is provided in a machine of this type, and to which reference has previously been made, to move the clamp more rapidly than does the friction box. 105 On the other hand, when the brake band is loose,

.the clamp is free to be moved up or down by means of a treadle 61, which is usually provided for this purpose. It is obvious that if the ring 21 were stationary instead of floating, the clamp could not be moved up or down by treadle.

Other modes of applying the principle of our invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the, equivalent of such stated means be employed.

We therefore particularly point out and distinctly claim as ourinventionz- 1. In clamp actuating mechanism forpaper'120.

cutting machines and the like, means for moving said clamp into engagement with the'pile of paper to be out including a shaft having plates secured thereto, plates for driving said lastnamed plates, 9.- ring encircling said driving plates and adapted when'rotated in one direction to rotate said driving plates, said ring being rotatable in the opposite direction independently of said driving plates, and a band adapted to be tightened about said ring for the purpose of rotating saidring.

. 2. In a clamp actuating mechanism for paper cutting machines and the like, means for moving said clamp into engagement with the pile of paper to be cut including a shaft having plates secured thereto, plates for driving said last-named plates, 9. ring encircling said driving'plates and adapted when rotated in one direction to rotate said driving plates, said ring being rotatable in the opposite direction independently of said drivsets of plates, means for varying the degree of pressure between said sets 01' plates, said means comprising a handwheel thread/ably secured to said shalt, and a collar mounted on said shaft between said handwheel and one or said driven plates and movable axially along said shaft by said handwheel, and means for visually indicating the degree of said pressure, said means comprising a dial mounted on said housing and having its face disposed in a plane at right angles to the axis of said shaft, and a pointer movable along said dial in response to the axial movement of said collar.

RALPH S; TYLER. HERBERT McGEORGE.

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