US1504521A - Paper-cutting machine - Google Patents

Description

Aug. 12, 1924. 1,504,521

0. SEYVBOLD PAPER CUTTING MACHINE Filed 001:. 20, 1920 4 Sheets-Sheet l INVENTOR. (Mews 5: 7.5

ATTORNEYJ Aug. 12 1924. 1,504,521

- C. SEYBOLD PAPER CUTT ING MACHINE Filed 20. 1920 4 Sheets-Sheet 2 INVENTOR. [M2155 557.5040.

' ATTORNEYJ C. SEYBOLD PAPER CUTTING MACHINE Filed Oct. 20, 1920 4 Sheets-Sheet 3 INVENTOR.

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A TTORNEYJ Aug. 12-. 1924. 1,504,521

C. SEYBOLD PAPER CUTTING MACHINE Filed Oct. 20, 1920 4 Sheets-Sheet 4 ATTORNEYS Patented Aug 12, 1924,

CHARLES SEYBOLD, 0F DAYTON, OHIO.

UNITED STATES PAPER-CUTTING MACHINE.

Application-filed October 20, 1920. Serial No. 418,205.

Montgomery and State of Ohio, have in;

vented certain new and useful Improvements in Paper-Cutting Machines, of which. the following is a full, clear, and exact description, reference being had to the drawings forming part of thisspecificat-ion.

My invention relates to machines for cutting and trimming bundles or piles of paper and has particularly to do with improvements of the clamping mechanism in which the piles of paper are held with increasing frictional pressure as the cutting knife is drawn through the pile.

Heretofore, so far as I am aware, it has been customary to operate the clamp by a friction clutch interposed between the clamp pulling bars and the driving power so that the clamp will compress the pile within the fixed limits of the friction clutch which is designed to slip when the maximum pressure has been attained.

The quality of the paper stock dulls the knife and the time consumed to remove a dull knife for sharpening is an element of considerable moment in the working capac ity of the machine, so that knives are apt to be kept in use until they can be no longer forced through the bundle of paper stock. It becomes of importance, therefore, in some cases to provide friction mechanism for the clamp which shall not be limited to any fixed amount but which shall automatically increase as the need for holding the pile increases during the cutting operationI A. dull knife itself acts as a clamp until it begins to cut so that the need for the compression of the pile increases as the knife passes through the paper stock.

It is-the object of my invention topro vide for this desired increase of the clamp pressure by increasing-the speed of rotation of the clutch member in the manner and with the mechanism to be hereinafter particularly pointed out and claimed whereby the friction clutch elements are caused to travel with increased speed as the knife proceeds with its work.

In the drawings,

Figure 1 is a front elevation of one form of paper cutting machine with my improvements applied thereto;

Figure 2 is a front elevation of the invention in detail showing the working parts.

Figure 3 is a rear elevation of the sa'me.

Figure 4 is a cross section taken on the lines 4.& of Figure 2 looking in the direction of the arrow. p p} Figure 5 is a diagrammatic end view of the clamp.

The general construction of one form of paper cutter to which my invention is applied comprises the ordinary operating parts mounted in a solid substantial frame-work 1 with cutting table 2 and side standards 3, 3 for holding and guiding the knife carrier ft and clamp 53. The knife carrier carrying the cutting knife '6 is actuated in the usual way by the pulling bars 7 7 coupled to the main driving shaft 8 of themachine which is rotated by the driving pulley 9.

The paper clamp 5 is provided with side pulling arms which are coupled to a rock shaftlO mounted in suitable bearings transversely of the machine so that with the rocking of this shaft the clamp is brought down upon the pile of paper to be out. The rock shaft is actuated by connection with the knife driving shaft of the machine in the ordinary construction and a friction clutch connection provided between this driving shaft and the clamp rock shaft, so that the paper pile will be held during the cutting operation under the fixed tension of this friction clutch. This is'the ordinary construction and it is to improve upon this construction that my invention is directed. The other details of construction of the paper cutter are not of importance and so far as shown are for illustrative purposes only.

In Figures 2, 3 and 4 I have shown the novel features of my present invention comprising the mechanism for frictionally connecting the knife drive shaft with the rock shaft for the clamp to obtain automatically increasing pressure of the clamp as the knife proceeds with its work.

Keyed to the drive shaft 8 is an eccentric 12 carrying the eccentric strap 13 which is split as usual for mounting and the halves held together by the clamp bolts 14, 14.

Formed on the eccentric strap is a boss 15 into which is screwed a link arm 16, the outer end of which is pivoted at 17 to a rocker arm 18 which is loosely mounted on the rock shaft 10. The link arm 16 is pivoted to the rocker arm about mid-way of its 7 a which bear upon the disks"31.

' loosely journaled on the hollow shaft 19 are a pair of pinions 23, 23, which engage the segment gears on the roek shaft 10, while keyed Ito thehollowishaft 19 between the pinions isa ratchetwheel '24 which isehgaged-by a pawl 25 pivoted at 26 to the rocker arm 18 and which prevents the ratchet fromfany back movement while permitting'free movement in the opposite direction. The-pawl is held in engagement with the ratchet by the spring 27 mounted in the housing '28. Keyed to the hollow shaft 19 are friction clutch member's'29 having six cup shaped recesses for the reception of coiled springs 30, the outer ends of which are secured to the disks 31, also keyed on the hollow shaft. The clutch members are thus held by these springs in frictional engagenientwitli the leather disk washers 32 carried by the side faces of the loosely mounted pinions and any desired frictional tension may be. obtained by tightenlng the nuts 21 7 being obtained, "the hollow shaft '19 is ex-' on the screw threaded ends of the rod 20 In order to preventitoo great a tension tended a slight distance beyond the tension members 29 so as to form a shoulder 33 at each end and prevent tightening up the disks 31 beyond a xed point.. It will be under stood from the foregoing that the pinions 23, 23'are' thus frictionally secured to the hollow shaft'and the ratchet wheel but that the pinionswhich are in engagement with thesegment. gears 22 can slip under the tension of the clutch members as the rockerarm 18 is carried its full stroke under the action of the eccentric' 12 on thedriving shaftr8.

The segment gear 22 is provided. with a lug. 34 which normally lies in engagement With a corresponding lug 35 on therocker arm 18 and as the segment gears 22 are keyed to.the rockshaft 10 and this rock shaft is'coupled to the pulling arms of the .clainp as the rocker armris swung by the eccentric the teeth .of the pinions 23 carry 1 thesegment gears by pushlng on them and thu'srock the shaft 10 and bring the clamp do wrr l to thepaper pile. As soon as the clamp; meets the pile and is stopped in its downwardmovement the tension between the pinions 23 and the hollow shaft 19 is exerted to compress the paper pile. As soon asthe limit oftension isrreached inasmuch as the ratchet can not rotate being held by thepawl 25, the pmions begin to rotate,

maintaining. the' compression and the lugs 6 34' and 35 separate, the rocker armcontinuthe frictional tension is applied a frictional tension of 1000 pounds will give a compression of 2000 pounds. On the return stroke of the rocker arm the ratchet is released by the pawl and the ratchet, hollow shaft and pinions rotate back to normal, the lug 35 on the rocker arm picks up the lug 34 on the segment gear and the rock shaft 10 is rocked back to its normal position lifting the clamp to its raised position and releasing the paper pile. \Vhile the friction clutch remains constant the actuation of the rocker arm by the eccentric causes the rocker arm to increase its speed to the middle of its stroke and then gradually to decrease. This increase of speed proportionally increases the clutch pressure as the knife enters the paper pile and therefore the compression exerted by the clamp increases as the knife enters the pile.

To prevent any overthrow of the rock shaft in lifting the clamp I provide a band brake36 engaging a pulley on the rock shaft 10 which is regulated by spring tension bolt 37 Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is 1- 1. In a paper cutter, the combination with the knife driving mechanism and a rock shaft for actuating the clamp, of means for rocking the shaft comprising a member fixed thereto and a member loosely mounted thereon in engagement therewith, a friction clutch for the loosely mounted member and means for actuating said member to rock the clamp actuating shaft and actuate the clamp in both directions.

2. In a paper cutter, the combination with the knife driving mechanism and a rock shaft for actuating the clamp, of means for rocking the shaft comprising a member fixed thereto and a member loosely mounted thereon in engagement therewith, a friction clutch for the loosely mounted member and an cecentric for swingin the loosely mounted member positively in both directions to bring the clutch into action and to actuate the clamp in both directions.

3. In a paper cutter, the combination with the knife driving mechanism and a rock shaft for actuating the clamp, of means for rocking the shaft comprising a segment gear fixed thereto and a rocker arm loosely mounted thereon, a pinion mounted on the rocker arm in engagement with the segment gear with a friction clutch interposed between the pinion and gear and means for swinging the rocker arm to bring the clutch into action and to actuate the clamp in both directions.

4, In a paper cutter, the combination with the knife driving mechanism and a rock shaft for actuating the clamp, of means for rocking the shaft comprising a segment gear fixed thereto and a rocker arm loosely mount ed thereon, a pinion mounted on the rocker arm in engagement with the segment gear with a friction clutch interposed between the pinion and gear and an eccentric for swinging the rocker arm its full stroke to increase the clutch action.

5. In a paper cutter the combination with a driving shaft for the knife and a rock shaft for the clamp, of a segment gear keyed to the rock shaft, a rocker arm loosely mounted on the rock shaft, a pinion mounted on the rocker arm in engagement with the segment gear, means for normally locking the gear from rotating and a friction clutch interposed between the pinion and the locking means, with means for actuating the rocker arm its full stroke under the tension of the clutch when the clamp reaches the paper pile.

6. In a paper cutter the combination with a driving shaft for the knife and a rock shaft for'the clamp, of a segment gear keyed to the rock shaft, a rocker arm loosely mounted on the rock shaft, a pinion mounted on the rocker arm in engagement with the segment gear, a pawl and ratchet for normally look ing the gear from rotating and a friction clutch interposed between the pinion and the ratchet with an eccentric for actuating the rocker arm its full stroke under the tension of the clutch when the clamp reaches the paper.

7. In a paper cutter the combination with a driving shaft for the knife and a rock shaft for the clamp, of a segment gear keyed to the rock shaft, a rocker arm loosely mounted on the rock shaft, a pinion in engagement with the segment gear, a hollow shaft journaled in the rocker arm upon which said pinion is loosely mounted, a ratchet keyed to the hollow shaft with pawl on the rocker arm to lock same from movement in one direction and friction clutch members intermediate the pinion and the hollow shaft, an eccentric on the knife driving shaft and link connection therefor, with the rocker arm whereby the swinging of the rocker arm will cause said pinion to rock the clamp rock shaft under the tension of the friction clutch.

CHARLES SEYBOLD.

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