US1575649A - Paper-cutting machine - Google Patents

Description

March 9 1926. 1,575,649

C. SEYBOLD PAPER CEJTTING MACHINE Filed A ril 12, 1324 Patented Mar. 9, 1926.

UNITED STATES CHARLES SEYBOLD, F DAYTON, OHIO.-

PAPER-GUTTING MACHINE.

, Application filed April 12, 1924. Serial No. 706,188.

To all whom it may comer n:

Be it known that I, CHARLES SEYBOLD, a citizen of the United States, and a resident of Dayton, in thecounty of Montgomery and State of Ohio, have invented certainnew and useful Improvements in Paper- Cutting Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing. forming part of this specification.

My invention relates to the clamping mechanism for power paper cutting machines, whereby the clamp for the paper piles may be actuated under direct spring pressure from the driving mechanism of the machine without the intervention of any friction clutch mechanism to hold the clamp to its work when the maximum clamp pressure has been attained, and also to provide a construction in which the power required for the'application of the necessary pressure shall .be, automatically controlled to'vary the pressure in proportion'to the height of the pile, a moderate pressure when the pile is low and automatically increasingas the height of the pile increases. I

Another feature of the importance is the arrangement whereby a compound leverage is obtained, whereby each pound of pressure applied may be enhanced many t1m es in its application to the paper pile and in which comparatively light springs are required for the work.

The invention consists of that certain novel construction and arrangement of parts to be hereafter more particularly pointed out and claimed, whereby the above results are attained.

In the drawing:

Figure 1 is a side elevation of a paper cutting machine illustrating my improved clamping mechanism.

Figure 2 is a perspective view of a por- -tion of the mechanism. 7

In the drawings, I have only illustratedsuch parts of the paper cutter as, may be necessary to show the application of my invention to an ordinary paper cutter of typical construction and it will be understood that the mechanism can readily be applied to any of a great variety of familiar types of machines. As illustrated, 1 is the base of the machine with 2 the cutting table, 3

.the clamp and 4 one of the side housings.

Securely bolted to the side of the base is a bracket 5 on which an L-shaped lever 6 is fulcrumed 'on the bolt 7. A pair of hangers 8, 8, are also pivoted on this same bolt 7, so that they can rock freely. The lower ends of these hangers carry a cam roller 9 between them, which is engaged by the cam 10 on the power knife drivmg shaft 11, of the machine. The pin on wh1ch the cam roller 9 is mounted also carries the rollers 12, 12, outside the hangers 8, 8, which rollers bear against the double inclined surface 13 on the lever 14, which is pivoted on the pin at the outer endof theL-shaped lever 6.

The lever 14 just beyond thepivot 15 carries a U-shaped hanger 16 pivoted at 17 which hanger suspends a coiled spring 18 the upper end of which bears against a block 19, pivoted on the pin 20 at the outer end of an arm 21, projecting from the L-shaped lever 6. The spring 18 is held in position and guided by the guide rod 22, which passes up through the block 19. The guide rod 1s threadedat each end and the spring 18 is placed under tension by adjusting nuts so that tension is exerted on the lever 14 to hold the stop 24 on the lever normall agamst the set screw 25 onthe lever 6. space bar 27 extends between the arm 21 and the lever 6 to render the L-shaped lever more rigid.

On the upper. end of the L-shaped lever at 28 1s plvoted a curved pressure lever 29, and on the pressure lever the roller 30 travels. Tllls roller is mounted in the outer end of the clamp pressure lever .31, which is secured on the clamp rock shaft 32, 'oumaled 1n the housing 4, there being ano er similar lever on the other end of the shaft. The 1nner ends of the clam lever 31 are coupled by brass boxes 34, w ich slide in slots in the lever for the clamp bar 3. i

The outer end of the curved pressure lever 29 is connected with the outer end of the lever 14, by a coiled spring 35. sprin 1s gulded by a spring rod 36, the lower en of which is screwed into a swivel 37 pivoted on the lever 14. The upper end of this spring rod is smaller in diameter and is threaded part of the way. A collar 38 is free to slide on the small diameter of the rod and acts as a guide for the spring and against this collar bears the adjusting nut 39 to adjust the tension of the spring. The collaris, bored smooth to slide on the rod 36 and extends upwardly with a screw threaded extension'to screw mto the swivel leather and a steel washer 42 and nuts 43. In order to hold the L-shaped lever in the position to which it may be rocked, as will be hereinafter described, I provide a pawl and ratchet construction as follows: Fulcrumed on a pin 46 on the upper end of the lever 6, is a double pawl 47 which carries pawl blades 48, secured by screws 49 so as to have a slight oscillating motion in the slot 50 in the pawl.

The opposite end of the pawl carries springs 51 in pockets which springs bear on spring pins 52, which ride on the circular edge 53 of the bracket 5. Two circular ratchets 54 are engaged by the pawl blades 43 and hold the lever 6 from turning clockwlse.

' It is, however, necessary to release the pawl to permit the parts to return to normal position. Pivoted' to the pawls 1s a pawl lifting rod 55, which extends down to the inner end of the lever 14 and to which is secured a shoe 56. This shoe normally rests against a block 57, secured to the lever 14. Now when the lever 14 is rocked as W111 be hereinafter described, the end of the shoe drops to the upper side of the block and when the lever 14 rocks back to normal pos1- tion, the rod 55 is lifted which raises the pawls 47 from engagement with the ratchet teeth 54, releasing the L-shaped lever and allowing it to rock clockwise tonormal position, while at the end of this movement, the rod 55 comes into contact with a knock off plate 58 secured to the bracket 5 and the shoe 56 is knocked off of the block 57 and allows the pawls 47 to return to engagement with the ratchet 54.

The mechanism operates as follows:

The paper pile being placed on the table and the machine set in operation, the cam 10 hearing on the roller 9, tends to rock the lever 14, and inasmuch as a framework is formed by the L-shaped lever 6, the curved pressure lever 29 and the spring 35 connecting the ends of lever 29 and lever 14, the entire framework rocks on the pivot 7 as a fulcrum and the roller 30 rides up the curved surface of lever 29, and lifts the clamp pressure lever 31, lowering the clamp to the paper pile, applying pressure thereon, until the spring 35 compresses within its limits. During this movement. a compound leverage is obtained as the distance from end of lever 29 to the roller is much greater than the horizontal distance from the roller swans to the fulcrum. It will also be noted that as the roller rides out on the lever 29 this leverage decreases so that for high piles of paper the power applied is greater than with low piles, and that the power ap lied s direct-l proportional to the height 0 the paper pi e. Now when full compression of the pie is obtained in this way, the continued rotation of the cam on the cam roller causes the lever 14 to rock away from the stop 24 against a slight compression of the spring 18 and the rod 36 moves upwardly through the swivel 40, maintaining the full compression of the paper pile under the tension of spring 35, and here again for this final movement of the power cam, I have increased leverage as the distance of the pivot 15 to the cam roller is very much greater than the distance to the swivel 37.

The pawls 47 hold the clamp shaft in the position it may be rocked by the mechanism, and during the final movement of the driving cam, the lever 14 separates from the stop 25 allowing the pawl lifting rod to drop under the block 57 so that as soon as the driving cam has passed its high point the spring 18 returns the lever 14, and the pawls are released which allows the L-shaped lever 6 to rock back to its normal position. The clamp shaft is provided with the usual coiled spring (not shown) to rock the shaft and return the clamp to its high position ready for the next operation. In view of the fact that with my improved construction as above described, every pound of pressure exerted by the driving cam will give approximately ten pounds of pressure on the clamp, comparatively light springs may be employed and the compression of the springs is also slight, so that the wear and tear is reduced to a minimum.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a device of the character specified, a paper support and a clamp bar to hold the paper pile on the support, a rock lever and connection therefor with the clamp to operate same, a. s ring operating on the rock lever to hol the clamp bar under spring tension and through which the ultimate clamp pressure is applied, a lever pivoted on the rock lever for actuating the same to apply the tension, and a power means to actuate the rock lever, while permitting the full operation of the power means.

2. In a device of the character specified, a paper sup ort and a clamp bar to hold the paper pi e on the support, a rock lever and connection therefor with the clamp to operate same, a spring operating on the rock lever to hold the clamp bar under spring tension and through which the ultimate clamp pressure is applied, a lever pivoted on'the rock lever for actuating the same, to apply the tension, and a power driven cam to actuate the last mentioned lever, with means to permit this lever to yield to permit the full operation of the cam, while maintaining the spring tension. 3. In a device of the character specified, a paper sup ort and a clamp bar to hold the paper .pi andconnection therefor with the clamp to operate same, a spring operating on the rock lever to hold the clamp bar under spring tension, a lever pivoted on the rock lever for actuating the same to apply the tension, and a power drivencam to actuate the last mentioned lever, with a second spring to .maintain the ultimate resilient tension of the rock lever while permitting the lever to yield for the full cam action.

4, In a device of the characterspecified, a paper support and a clamp bar to hold the paper pile on the support, arock lever and connection therefor with the clamp to operate same a spring operating on the rock lever to hold the clamp bar under spring tension and through which the ultimate clamp pressure is applied, a lever pivoted on the rock lever for actuating the same to apply the tension, and a ower means to actuate the rock lever, an means to hold the rock lever, as it is rocked by the power means. 7

5. In a device of the character specified, a clamp bar to hold the paper pi e on the sup ort, a rock lever and connection therefor with the clamp to operate the same, a s ring operating on the rock lever to hold t e clamp under ultimate spring tension, a lever pivoted on the rock lever a inst which the spring operates and powerriven means bearing on the lever to actuate the rock lever, with a sprin to maintain the tension on this lever,"an to 't the lever to yield for the full opers.

e on the support, a rock lever ation of the power drivennmeans, without releasing the sprin tension.

6. In a device 0 the character specified,

hold v lever with a spring bearing between thelever and the 1 outer end of the actuating portion of the L-shaped lever connecting with the clamp bar, a second spring bearing between the actuating lever and the L-.

shaped lever to hold same in position, and a power driven cam bearing on said actuatinglever. to apply resilient pressure on the clamp, whereby the yield to permit the complete operation of the cam, without releasing the clamp pressure. I V y 7 In a device of the character specified, a paper support and a clamp bar to hold the pa e! on the support, an L-shaped lever pivote on the frame, with connection therefor with the clamp bar to operate same, an actuating lever pivoted to the L-shaped lever with a spring bearing between the outer end of the actuating lever and the portion of the L-shaped lever connecting with the clamp. bar, a second spring hear ing between the actuating lever and the L- shaped lever to hold same in position, and a power driven cam bearing on said'actuating lever to apply resilient pressure on the clamp, whereby the actuating lever. may

yield to permit the complete operation of the cam, without releasin the clamp pressure, and a pawl and rate at to hold the L- shaped lever in position with connection intermediate the awl and actuating lever to release the paw at the completion of the cam throw.

actuating lever may- CHARLES SEYBOLD.

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