US889213A - Paper-cutting machine. - Google Patents

Description

PATENTED JUNE 2, 1908. T. 0. DEXTER; PAPER cumne MACHINE.

APPLICATION FILED JULY 31. 1907.

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No. 889,213. j PATENTBD JUNE 2, 1908. T. c. DEXTER. PAPER CUTTING MACHINE.

AIPLIOATIOK FILED JULY 31. 1907.

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No. 889,213; a 4 PATENTED JUNE 2, 1908.

T. G. DEXTER.

, PAPBR'CUTTING MACHINE.

APPLICATION FILED JULY 31. 1907- 4 snng'rs-snnnr a.

TALBOT O. DEXTER, OF PEARL RIVER, NEW YORK.

PAPER-CUTTING- MACHINE.

Specification of Letters Patent.

Patented June 2,1908.

Application filed July 31, 1907. Serial N02 386,318.

To all whom it may concern:

Be it known that I, TALBOT C. DEXTER, a citizen of the-United States, residing at Pearl River, in the county of Rockland, State of New York, have invented certain new and useful Improvements in Paper-Cutting Machines, of which the following is a specification.

In thelong line of improvements in the art of paper cutting machinery, it will be found that the great majority of inventions have aimed at the improvement of the operating mechanism for the paper holding clamp ;-the knife and its operating mechanism remaining substantially the same as devised by the earliest inventors in this line. Many important improvements have been made in an eflort to perfect the operation of the paper holding clamp, and most of these improvements have been devised with the purpose of producing machines with automatic clamps which will simulate as near as possible what is known as the hand clamp principle, which is recognized by all manufacturers as the most effective mechanism that has ever been produced for clamping a pile of paper in a cutting machine. Hand clamp machines are almost invariably built upon the screw principle for the reason that the screw gives ample power for the application of the requisite pressure to the clamp without requiring too much manual exertion, and at the same time affords a convenient means for manipulating the clamp. The efficiency of the hand clamp mechanism operating on the screw principle is due, not only to the amount of pressure exerted, but to the manner in which the pressure is applied,that is, the positiveness with which an absolutely fixed pressure is secured and held until the knife has passed through the pile of paper. Such positive and effective action cannot be obtained with any other form of clamp operating mechanism. In hand clamp machines, the clamp is mounted independently of the knife, and is, therefore, operated separately and is entirely free from the objection able influence of the vibrations of the knife as it passes through the paper. This is a further great advantage of the hand clamp machines.

The one objection to the use of the old hand clamp mechanisms is the slowness of operation causing a waste of time and an in crease in the expense of the paper cutting operation.

Recognizing the value of the screw clamp principle, I have produced an automatic clamp paper cutting machine which embodies the screw clamp action of the old form of hand clamp machine, and the rapidity of operation of automatic clamp machines, which is required for modern paper cutting machinery. In producing such a machine, I have arranged means for automatically and quickly lowering and raising the clamp into and out of engagement with a pile of sheets, and suitable screw mechanism, actuated by supplemental means, for imparting a clamping pressure to the clamp after it has engaged the pile, and for releasing the clamping pressure after the completion of the cutting stroke of the knife. This improved construction possesses all of the advantages and efliciency of the old hand clamp principle, and at the same time obviates the objectionable slowness of operation of the old forms of ma chines.

In practically carrying my invention out I prefer to adopt a form of machine in which the knife and clamp move into and out of engagement with the pile simultaneously,

the power forthesc up and down movements beingapplied to the knife, but I donot limit myself to this form of machine. In this form of machine the connection between the knife and clamp is usually effected through means of diagonal slots formed in one member engaged by pins or lugs projecting from the face of the other member, so that while the two members move simultaneously up or down for part of the stroke, the engagement of the clamp with the pile causes relative movement both vertically and transversely, effecting the shearing action of the knife during the cutting operation. Cutting machines having the simultaneously operating knife and clamp of this form are very old. In my new machine I may employ this movement, so far as the clamp is concerned, solely for the purpose of moving the clamp into and out of engagement with the pile, so as to obtain quick action and avoid. the slow and tedious operation of thescrew action in the old forms of hand clamp machines, and in some automatic clamp machines in which screws are employed for carrying the clamp through its entire movements. The clamp may, how ever, be moved into and out of engagement with the pile by other meansindependently of the knife without departing from the spirit of my invention.

To permit the free movement of the clamp action.

downwardly and upwardly with the knife, and at the same time provide for screw clamp action, I have arranged the nuts in which the screws operate in sockets formed in the cross-head of the machine frame, and have provided rack and pawl connections between the cross-head and nuts. The nuts are preferably formed with rack bars upon their projecting faces, and the pawls or dogs are journaled in recesses formed in the heavy Wall of the cross-head. In addition to these detachable connections between the nuts and crosshead, I provide automatic means for o erating the pawls or dogs so that during t 1e main parts of the up and down movements of the clamp with the knife, the nuts can remain disconnected from the crosshead and will move freely with the screws and clamp, but immediately after the clamp bar has reached the pile of paper, said automatic means actuate the pawls or dogs and cause them to rigidly lock the nuts in posi tion upon the cross-head preparatory to the action of the screws which impart the final clamping pressure upon the clam 3.

In this type of machine it will be understood that the moment the clamp touches the pile of paper in the clamping operation,-

the continued movement of the knife will cause its lateral or shearing action. Taking advantage of this transverse movement of the knife with reference to the clamp, I have devised a simple form of mechanism for imparting the clamping motion to the screws. The clamp-actuating screws are freely journaled at their lower ends upon the clamp bar and threaded through the nuts and have sliding spline connection with gears of a suitable train actuated by a transversely movable rack bar connected through suitable mechanism with the knife. The result of this arrangement will be the operation of the screws for applying the final clamping pressure the moment that the knife starts to move transversely relatively to the clamp. This screw operating mechanism is so ar ranged that a pressure of the required degree will be exerted and the operating mechanism then be automatically thrown out of This automatic release of the operating mechanism may be either by an automatic trip for positively disconnecting the parts, or by means of suitable slip friction mechanism having the capacity for holding up to a certain number of pounds of pressure. I prefer to operate the pawls which clamp the nuts uponthe cross-head by the same mechanism which actuates the screws, so that said nuts will be rigidly held the moment the screws begin to operate.

In order that my invention may be fully understood, I will first describe the same with reference to the accompanying drawings and afterwards point out the novelty more particularly in the annexed claims.

In said drawings Figure 1 is a front elevation of a paper cutting machine embodying my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a plan view of the same. Figs. 1 and 5 are enlarged detail vertical longitudinal sectional views of the machine taken respectively on the section lines 4-4 and 55 of Figs. 1 and Figs. 6 and 7 are respectively a detail side elevation and a detail plan view of a modified form of part of the mechanism for actuating the clamp screws.

As best suited for the purpose of illustrating my invention, I have shown it applied to the form of paper cutting machine in which the cutting member and clamping member are mounted to move toward and away from the pile of paper together under the influence of suitable operating mechanism acting upon the cutting member. In this type of machine the cutting member is arranged for longitudinal movement, in addition to its vertical movements, and the clamping member is confined in vertical guides so as to permit its vertical movements and prevent movement longitudinally, inclined slots in one of said members engaging pins carried by the other of said members to cause the cutting member to move in the direction of its length to effect a shearing cut when the clamping member engages and clamps the pile and the cutting member is forced through the paper. This general type of machine is very old in the art and is illustrated, for example, in the expired patent of Charles Montague No. 98,611, dated January 4th, 1870. The illustration of my invention as applied to this type of machine has been adopted by me as the simplest form of mechanism for practically carrying out my invention, but I would have it understood at the outset that I do not intend to limit my invention to its application to a machine of this particular type, since my improvement may readily be applied to other forms of paper cutting machines without departing from the spirit and scope of my invention, such, for instance, as those machines which have no direct connection between the cutting member and clamping member.

In the drawings 1, 2, represent the uprightside frames or standards, firmly braced and connected by suitable tie rods or frames and by the top rail or cross-head 3, the center rail 4 and the paper supporting table or plat form 5. This framework may be of any desirable construction best adapted for the pur pose of supporting the operative parts of the machine, but must be of heavy construction to properly withstand the strains to which the machine is subjected in operation.

6 is the knife bar and 7 is the cutting knife removably secured to the bar 6. The bar 6 carrying the knife operates in the vertical slots or guide-ways formed in the side frames or standards 1 and 2. The knife bar 6 is formed adjacent to its outer ends with the horizontal slots 8 in each of which engages an antifriction roller 9 journaled upon a pin 10 mounted in the yokeshaped draw bar 11. A draw bar 11 is provided at each side of the machine, the ends of the knife bar 6 projecting through the yokes of the draw bars, and engaging beneath the antifriction rollers 12 mounted on the pins 13 in the draw bar.

14 are guides secured to the upright end frames for confining the draw bars 11. To

' the lower end of each draw bar 11 is pivoted one end of the connecting rod 15, the other end of which is pivotally connected to a crank 16, which cranks are securely mounted upon the opposite ends of a crank shaft 17 which has suitable bearings in the side frames 1 and 2, and has intermittent motion imparted to it by means of the driving shaft 18 suitably geared to the crank shaft 17. The driving shaft 18 is provided. with the usual fly-wheel, driving pulleys and a starting clutch by which the machine may be thrown into operation and which is arranged to be automatically thrown out in a manner well understood in this art.

20 is the clamping bar suitably supported and guided between the side frames 1 and 2 in rear of the knife bar 6. The exact means for mounting and guiding the clamping bar 20 are not shown, but it will be understood that the bar may be mounted. in any suitable manner. The clamping bar 20 carries upon its forwardly presented face two rigid pins or lugs 21 which project into and engage in the inclined slots 22 formed in the knife bar 6. The purpose of this pin and slot engagement between the clamping bar and the knife bar is to cause the clamp bar to travel vertically toward and away from the pile of sheets under the influence of the positively driven knife bar, and to effect the longitudinal movement of the knife bar in the frame when the clamp engages the pile so as to produce a draw out. The structure so far as described with reference to the drawings is old and well known.

30 and 31 are the clamp operating screws, each one of which is formed with a threaded portion and a longitudinal key-way for the purpose which will presently appear. These clamp operating screws 30 and 31 are journaled at their lower ends in suitable bearings 35 rigidly secured to the clamp bar 20. The bearings 35 may be of any suitable construction rigidly secured to the clamp bar in any suitable manner so long as the operating screws 30 and 31 have a free rotary motion upon the clamp bar, and at the same time move Vertically therewith.

The threaded portions of the clamp operating screws 30 and 31 are threaded through the elongated nuts 40 which preferably have a rectangular exterior cross-sectlon and are loosely fitted in squared recesses or sockets 41 formed in the top rail or cross-head 3 of the main frame. These elongated nuts 40 are free to move vertically in the sockets -or recesses 41 for the purpose of automatically adjusting their relation to the cross-head 3 in the preliminary and final movements of the clamping bar and knife bar as they approach and move away from the pile of sheets.

Each elongated nut 40 is formed on its i11- wardly presented face with a vertical rack bar 15 which is adapted to be engaged by a pawl or dog 50 or 51. Each pawl or dog 50 or 51 is journaled at 52 in a recess ors'ocket formed in the top rail 3 or a boss or enlargement thereon, the ournal 52 passing through the walls of the journal recess to secure the pawls or dogs in position and further strengthen their mounting. It is necessary that the pawls or dogs 50 and 51 be very strongly made and securely mounted for the reason that the main strain of clamping comes upon these parts. A suitable spring, such as the leaf springs 55 shown engages each of the pawls or dogs 50 and 51 to give the same a normal spring tendency to engage one of the rack bars. Projecting downwardly from the journal 52 of the pawl 50 is a perforated ear or lug 60, and projecting upwardly from the journal 52 of the pawl 51 is a perforated ear or lug 61. The controlling rod 62 passes through the ears or lugs and 61 transversely of the machine, and is provided with the two tappet collars 63 and 64 adjustably secured upon the rod 62 in position to engage the ears or lugs 60 and 61 for operating the pawls 50 and 51.

The controlling rod 62 is connected through means hereinafter described, with the knife bar 6, so that when the knife bar is in its normal position of rest, the controlling rod 62 will be held in its extreme right hand position when looking at the front of the machine, for the purpose of holding the pawls 50 and 51 disengaged from the rack bars upon the elongated nuts. This connection of the rod 62 with the knife bar 6 also causes the rod to be shifted toward the left in unison with the movement of the knife bar to the left, for the purpose of permitting the pawls 50 and 51 to engage the rack bars upon the elongated nuts for holding said nuts in clamping position. When the pawls 50 and 51 are disengaged from said rack bars, the elongated nuts 40 are free to move vertically in the cross-head or top rail 3 with the clamping screws upon which they are mounted. This operation will be more fully explained after the description of the mechanism for operating the clamp screws.

Above its threaded portion, each of the clamp operating screws 30 and 31 is formed with a longitudinal key-way which passes freely through the hub of a pinion 71, the

pinion hub being formed with. a feather or together.

be understood that each of the screws 30 and 31 is provided with an operating pinion 71 mounted and operating as explained.

Centrally journaled in the cross-head or top rail 3 is a vertical screw operating shaft 80 carrying at its upper end a driving gear 81 which is rigidly secured to it. This driving gear 81 rests upon the circular boss 82 of the top rail 3, and meshes with and drives the intermediate gears 88 and 84 which are journaled upon studs 85 mounted in the bosses 86. These gears 83 and 84 mesh in turn with the driving pinions 71 upon the clamp operating screws.

The vertical driving shaft 80 is provided with a collar 88 which engages the under face of the top rail 3 to confine it in its proper vertical position. Keyed to the lower end of the operating shaft 80 is a driving pinion 90, which meshes with the rack teeth 91 formed on the forward face of the bar 92 which extends transversely of the machine and has suitable bearings at 93 in the upright frame pieces 1 and 2. The bar 92 is driven by the movement of the knife bar 6 transversely of the machine by means which will now be explained.

92" is a stop secured to bar 92 and adapted to engage a part of the frame, such as side frame 1, to limit the return movement of the bar and insure the same extent of operation on the clamping screws when releasing as in applying pressure.

95, 95 is a sectional friction box which embraces and frictionally engages rack bar This friction box is formed of a main channel block 95 fitting over the rear face of the bar 92, and two angular blocks 95 embracing the forward corners of the bar 92, and the adjusting screws or bolts 95" which pass freely through the block 95 and are threaded into the sections 95 springs such as 95 encircling the outer ends of the bolts 95 affording spring pressure between the sections of the box and bar 92. The inner faces of the box sections are provided with facing of leather or other suitable friction material as shown at 95". By this means the frictional engagement of the box 95, 95 with the bar 92 may be adjusted to suit 50 the requirement for exerting more or less pressure upon the clamp operating screws.

Projecting from the rear face of the friction box 95*, 95 is a stud 96 upon which is journaled the inner end of a connecting rod 97. The connecting rod 97 projects outwardly toward the right side of the machine and is formed adjacent to its outer end with a horizontal guide loop 98 in which engages a guide pin 99 projecting from the upper portion of the side frame '2. The extreme outer end of the connecting rod 97 is formed with a bearing socket 100, which is journaled upon a stud 101 projecting rearwardly from a block 102 which is formed with a vertical bore through it for the reception of the vertical rod 103 mounted in the arms of the yoke-shaped bracket 104 secured at 105 to the rear face of the end of the knife bar 6. The block 102 slides freely 011 the rod 103 so as to permit the free vertical movement of the knife bar 6 without interfering with its connections with the rack bar 92, and at the same time to impart movement transversely of the machine to the friction box 95, 95 when the knife bar moves relatively to the clamp bar in a direction transversely of the machine.

An arm 110 is formed integral with or rigidly secured to the connecting rod 97 and projects over into position to engage the end of the controlling rod 62 of the pawls 50 and 51. This connection is suchthat when the connection rod 97 is actuated for operating the clamp screws, said controlling rod 62 will be moved in the same direction for releasing the pawls 50 and 51 to permit them. to engage the rack bars of the nuts 40. In place of employing the adjustable connection between the connecting rod 97 and the rack bar 92 as above described, I can employ any other suitable means which will impart a sullicient clamping stroke to the driving shaft and at the same time afford a lost motion connection topermit of the full stroke of the knife bar in the direction of its length. I do not intend to limit myself to any particular construction of such connecting links, and to more clearly illustrate the scope of .this part of my invention I have shown in Figs. 6 and 7 a modified arrangement of such connecting means which may be employed with equal satisfaction.

Referring to Figs. 6 and 7 it will be observed that the connecting rod 97 has pivoted to its inner end at 120 a yoke-shaped link 121 carrying in its yoked end a freely journaled antifriction roller 122 which rests upon the upper face of the rack bar 92 just behind a square block or lug 123. Adjustably secured to bracket or other suitable support extending from a convenient part of the machine frame is a cam trip block 125 formed with a wedge-shaped roller-engaging end 126 and having a supporting plate portion 127 formed with a horizontal slot 128 in which engages a set screw 129, by which the trip block may be secured in the desired adjusted position, just above .the rack bar 92. I11 the operation of the machine with this form of connection it will be observed that the lonknife bar.

gitudinal movement of the knife bar to the left will cause the connecting rod 97 to act through the link 121 to cause antifriction roller 122 to engage the block 123, and by its engagement force the rack bar 92 to the left to impart the clamping action to the clamp screws through the mechanism above described. This movement of rack bar 92 will continue until the antifriction roller 122 rides upon the cam portion 126 sufficiently to raise the roller 122 above the block 123, when the rack bar 92 will remain at rest (clamping pressure having by its movement to this point been effected) and the roller will continue its inward stroke without effect by riding upon the horizontal guide-way 126 of the adjustable cam block. In the return movement for this modified structure, the roller will pass freely over the block 123 and drop down in front of the same and engage the auxiliary block or post 130 to draw the rack bar 92 backward to the right to re lieve the screws of their clamping pressure. The advantage in this form of connection over the frictional connection above described, is due to the fact that in this modified form there is no release of the pressure of the clamp upon the pile of paper until the very last part of the return movement of the knife bar in the direction of its length, at which point the screw pressure is relieved and immediately following the pawls 50 and 51 are disengaged from the rack bars of the elongated nuts.

With the above description, the operation of my improved machine will be understood from, a brief explanation of the relative action of the novel parts. It will be understood that in operating the described type of paper cutting machine, the knife bar. and clamp move vertically together toward and away from the pile of sheets supported upon the table. In the machine of this type having my improvements applied to it, the machine at rest has its parts in the position shown in the drawings. In this position it will be observed that the pawls 50 and 51 are held out of contact with the racks upon the elongated nuts 40, so that the nuts are free to move vertically in the cross-head 3. When the machine is thrown into operation, it being understood that the pile of paper has previously been arranged upon the table, the clamping bar will move downwardly with the knife bar, causing the screws and 31 to move the nuts downwardly in their sockets in the cross-head 3. In this downward movement the splined or keyed upper ends of the screws move freely through the pinions 71. This described movement continues until the clamp engages the pile and compresses it sumciently to overcome the weight of the clamp and frictional engagement between the clamp and The moment that the clamp the knife will be to cause the controlling rod 62 to be moved to the left, with the result that the pawls 50 and 51 will be released and permitted to engage the rack bars upon the nuts 40, these nuts being moved downwardly with the clamp'bar and screws to'proper position preparatory to the final clamping pressure. Simultaneously with the engagement of the pawls with the rack bars, the connecting rod 97 moving to the left carries with it the rack bar 92, which imparts motion through the pinion 90, shaft 80, gears 81, 85 and pinions 71, to the clamp operating screws. These screws will be rotated for imparting a final pressure upon the clamp bar. The amount of rotation of the screws will depend upon the adjustment of the friction box 95, said friction box maintaining its holdupon the rack bar 92 until the compression of the paper develops suflicient resistance to overcome the frictional hold between the friction box and the rack bar. At this moment the friction box slips upon the rack bar and continues to slide thereon until the completion of the lengthwise movement of the knife which is coincident with its cutting action.

When the knife completes its downward stroke, the return movement immediately commences, with the result that the movement of the knife bar transversely of the machine will reverse the operation of the parts. The clamp being held firmly upon the pile will cause the knife to move upwardly and in the direction of its length with reference to the clamp to reverse the olamping screws and relieve the clamp of its extreme clamping pressure, and consequently remove the strain of engagement between the pawls 50 and 51 and the rack bars of the nuts. At the completion of the return endwise movement of the knife bar, the controlling rod 62 which has moved in unison with the knife bar, will approach its extreme right hand position, when tappets 63 and 64 will engage the ears or lugs upon the pawls 50 and 51 and positively disengage the pawls from the rack bars. This action entirely frees the nuts upon the clamp operating screws and the clamp bar is then free to move upwardly with the knife bar, it being carried up to its elevated position by the engagement of the pins or lugs 21 with the lower ends of the inclined slots 22.

There are many advantages resulting from my improved construction. In the first place I obtain the advantages due to the application of the screw action to the clamp operating mechanism, as hereinbefore referred to. The advantages of this screw movement for the clamp are particularly present in my machine because of the application of the screw pressure between a rigidly supported nut and clamping bar, by reason of which the clamp is absolutely relieved from any objectionable effect from the vibrations ofthe knife as it passes through the pile of paper. The manner of applying this screw pressure in my machine is of especial importance in its application to a machine of the type illustrated in my drawings, in which there is a pin and slot connection between the knife bar and clamp, which type of machine is probably more subject to the objectionable influence of the vibrations of the knife than any other type of paper cutting machine. It will be observed that in my machine there is the same pin and slot connection between the knife bar and clamp as in the old forms of this type of paper cutting machine, but by reason of the automatic means of positively providing a rigid connection between the screw nuts and the cross-head of the machine frame, I am able to so positively secure the clamp in contact with the pile, that the vibrations of the knife cannot by any possibility have any effect upon the clamp during the cutting stroke of the knife.

In my improved machine, I not only secure the advantages of the screw principle for operating the clamp, as pointed out, but I provide in addition thereto an automatic clamp paper cutting machine which is suffi ciently quick in operation to meet the requirements of modern times.

A further great advantage of my improved construction is due to the fact that the clamp cannot leave the pile of paper on the return stroke of the knife until the knife has passed beyond the upper edge of the pile, when the clamp is finally released so that there is no possibility of disarranging the pile by the engagement of the knife on its upper stroke.

So far as I am aware I am the first to devise a paper cutting machine in which the 'clamp is moved into engagement with the pile of paper and then given a final clamping pressure by some auxiliary mechanism actuated by the endwise movement of the knife bar. I believe I am also the first to devise such a machine in which clamp operating screws are operated by this endwise movement of the knife bar. I desire to claim these features broadly and in addition thereto the provision in a machine having a screw oper ated clamp, of nuts which, are movable relatively to the frame in which they are supported and such a mechanism in combination with automatically controlled means for positively engaging and supporting the nuts preparatory to exerting a final clamping pressure by the operation of the screws. In addition to these features which I claim to be broadly novel in my improved machine, I desire to claim the specific structure by which I prefer to practically carry out my invention.

In producing a clamp operating mechanism upon the screw principle in accordance with my invention, it is necessary to provide for the rapid movement of the clamp into and out of engagement with the paper independently of the screw action. In the machine shown in my drawings I have arranged for this rapid movement of the clamp by movably mounting the screw nuts in the cross head of the machine and arranging rack bars and pawls for periodically securing the nuts in place when the clamping screws are actuated. The same result can be ac complished by other means, such for instance as by rigidly mounting the nuts in the cross-head and providing relative movement between the screws and the clamp; or by rigidly mounting the screw nuts in the clamp and providing relative movement between the cross-head and screws; or by permanently journaling the screws in the crosshead and mounting the screw nuts in the clamp with provision for relative movement. I desire it understood that I consider any of these obvious arrangements for accomplishing the result for which my invention was devised, to be within the scope and spirit of my invention.

hat I claim is:

1. In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with clamp operating means actuated by the transverse movement of the knife.

2. In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with means for moving the clamp into and out of engagement with the paper, and auxiliary clamp operating means actuated by the transverse movement of the knife for applying clamping pressure.

3. In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with clamp operating screws, and means actuated by the transverse movement of the knife for operating said screws.

4. In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with means actuated by the vertical movements of the knife for moving the clamp into and out of engagement with the paper, and means actuated by the transverse movement of the knife for imparting clamping pressure to the clamp .upon the pile.

5. In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with means for moving the clamp into and out of engagement with the paper, and screws actuated by the transverse movement of the knife for imparting clamping pressure to the clamp upon the paper.

6. In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with means actuated by the vertical movements of the knife for moving the clamp into and out of engagement with the paper, and screws actuated by the transverse movement of the knife for imparting clamping pressure to the clamp upon the paper.

7. Ina paper cutting machine, the combination of a vertically reciprocating trans-' versely movable knife, and a paper holding clamp, with means for moving the clamp into and out of engagement with the paper, operating screws for compressing the clamp upon the paper, and means, including a lost 1110-.

tion connection, actuated by the transverse movement of the knife -for operating said screws.

8. In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with means actuated by the vertical movements of the knife for moving the clamp into and out of engagement with the paper, operating screws for compressing the clamp upon the paper, and means, including a lost motion connection, actuated by the transverse movement of the knife for operating said. screws.

9. In a paper cutting machine, the combination of a knife, and a paper holding clamp, with automatically operated means for moving the clamp into and out of engagement with the paper, clamp-operating screws for compressing the clamp upon the paper, and means for opreating said screws.

10. In a paper cutting machine, the combination of a knife, and a paper holding clamp, with means for moving the clamp into and out of engagement with the pile, clamp compressing screws, nuts operating upon said screws, and means for effecting relative rotation between the screws and nuts for applying pressure to the clamp.

11. In a paper cutting machine, the combination of a suitable machine frame, a knife,

and a paper holding clamp, with the cooperating screw member and nut member arranged between the frame and the clamp, one of said members having adjustable means connecting it with one of said parts, means for moving the clamp into and out of engagement with the paper, and means for effecting relative rotation between the screw and nut members.

12. In a paper cutting machine, the combination of a suitable machine frame, a knife, a paper holding clamp, means for moving the clamp into and out of engagement with the paper, with the cooperating 13. In a paper cutting machine, the com' bination of a suitable machine frame, a knife, and a paper holding clamp, with means for moving the clamp into and out of engagement with the paper, the cooperating screw member and nut member arranged between the frame and the clamp, said nut member having. adjustable means connecting it with one of said parts, and means for effecting relative rotation between the screw and nut members.

14. In a paper cutting machine, the combination of a frame, a knife, and a paper holding clamp, with means formovingthe clamp into and out of engagement with the paper, a clamp compressing screw, a detachable connection between said screw and frame, means for operating said screw, and means for actuating Saiddetachable .connection between the frame and screw.

15. In a paper cutting machine, the combination of a frame, a knife, and a paper holding clamp, with means for moving the clamp into and out of engagement with the paper, clamp compressing screws, nuts operating upon said screws, detachable connections between said nuts and the frame means for operating said screws, and means for actuating said detachable connections between the nuts and frame.

16. In a paper cutting machine, the combination of a frame, a vertically reciprocating transversely movable knife, and .a paper holding clamp, with means for .mov'ing the clamp into and out of engagement with the paper, a clamp compressing screw, a detachable connection between said screw and the frame, means actuated by the transverse movement of the knife for operating said screw, and means actuated by the same movement of the knife for actuating said detachable connection between the frame and screw.

17. In a paper cutting machine, the combination of a frame, a vertically reciprocating transversely movable knife, and a paper holding clamp, with means for moving the clamp into and out of engagement with the paper, clamp compressing screws, nuts operating upon said screws, detachable con.

nections between said nuts and the frame, means actuated by the transverse movement of the knife for operating said screws, and means actuated by the same movement of the knife for actuating said detachable con nections between the frame and nuts.

18. In a paper cuttmg machine, the combination of a frame, a papercutting knife, a paper holding clamp, means for moving the clamp into and out of engagement with the paper, clamp-compressing screws, nuts operating upon said screws and movably mounted in the frame, means for periodically securing the nuts against movement upon the frame, and means for actuating said screws for compressing the clamp.

19. In a paper cutting machine, the combination of a frame having a paper supporting table and a cross-head above the table, a paper cutting knife, a paper holding clamp, means for moving the clamp into and out of engagement with the paper, clamp-compressing screws, nuts operating upon said screws and mounted in said cross-head to move toward and away from said table, means for automatically securing the nuts against movement on the cross-head, and means for actuating said screws for compressing the clamp.

20. In a paper cutting machine, the combination of a frame having a paper supporting table and a cross-head above the table, said cross-head being formed with nut-receiving recesses or openings, a paper cutting knife, a paper holding clamp, means for moving the clamp into and out of engagement with the paper, clamp-compressing screws, nuts operating upon said screws and mounted in said recesses or openings of the cross-head. to move toward and away from the table with the screws, means for automatically securing the nuts against movement upon the crosshead, and means for actuating said screws for compressing the clamp.

21. In a paper cutting machine, the combination of a machine frame, a paper cutting knife, and a paper holding clamp, with screw nuts mounted upon the frame and movable vertically thereon, rack bars upon said screw nuts, pawls or dogs mounted upon the frame in operative relation to said rack bars, means for moving said pawls or dogs into and out of engagementwith said rack bars, clamp compressing screws operating in said nuts and upon said clamp, means for actuating said screws, and means independent of said screws and. nuts for raising and lowering the clamp.

22. In a paper cutting machine, the combination of a machine frame, a paper cutting knife, and a paper holding clamp, with clamp-compressing screws, nuts operating upon the screws and movably mounted upon the frame, rack bars upon said screw nuts, pawls or dogs mounted upon the frame in operative relation to said rack bars, means for moving said pawls or dogs into and out of engagement with said rack bars including springs for moving them in one direction and a controlling rod for moving them in the opposite direction, means independent of said screws and nuts for raising and lowering the clamp, and means for actuating said screws.

23. In a paper cutting machine, the combination of a machine frame, a paper cutting knife, and a paper holding clamp, with clamp compressing screws, nuts operating upon the screws and movably mounted upon the frame, rack bars upon said screw nuts, pawls or dogs mounted upon the frame in operative relation to said rack bars, springs for moving said pawls or dogs into engagement with said rack bars, a controlling rod arranged to disengage said pawls or dogs from said rackbars, means actuated by the knife for operating said controlling rod, means independent of the screws and nuts for raising and lowering the clamp, and means for actuating said screws.

24. In a paper cutting machine, the combination of a paper cutting knife, and a paper holding clamp, with clamp compression screws, a longitudinally movable bar, means for operating said bar, and gearing between said bar and said screws.

25. In a paper cutting machine, the combination of a paper cutting knife, and a paper holding clamp, with clamp compression screws, a longitudinally movable bar actuated by the knife, and gearing between said bar and said screws.

26. In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with clamp compression screws, a transversely movable bar actuated by the transverse movement of the knife, and gearing between said bar and said screws.

27 In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with clamp compression screws, a transversely movable bar actuated by the transverse movement of the knife, rack teeth upon said bar, a gear wheel meshing with said rack teeth, a shaft upon which said gear wheel is mounted, and gearing between said shaft, and said screws.

28. In a paper cutting machine, the combination of a paper cutting knife, and a paper holding clamp, with clamp compression screws, a longitudinally movable rack-bar, means for actuating said bar, a shaft carrying a gear meshing with said rack-bar, pinions upon said screws, and gearing between said shaft and said pinions.

29. In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with pair of clamp compressing screws, a gear wheel upon a shaft, said shaft being suitably geared. to said screws for operating them, a transversely movable rackbar meshing with said gear wheel, and means connecting said rack-bar with the knife.

30. In a paper cutting machine, the combination of a suitable frame, a vertically reciprocating transversely movable knife, and

'or link operatively engaging said bar, means for operating said rod or link, and means for restricting the extent of action of the rod or link upon the bar.

32. In a paper cutting machine, the combination of a vertically reciprocatingItransversely movable knife, and a paper holding clamp, with clamp operating screws, a transversely movable bar, means actuated by said bar for o erating said screws, a rod or link operative y engaging said bar, means connecting said rod or link with the knife, and means for restricting the extent of action of the rod or link upon the bar.

33. In a paper cutting machine, the combination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with clamp operating screws, a transversely movable bar, means actuated by said bar for operating said screws, a rod or link operatively engaging said bar, connecting means between said rod or link and the knife arranged to permit relative motion vertically and cause said rod or link to move transversely of the machine with the knife, and means for restricting the extent of action of the rod or link upon the bar.

34. In a paper cutting machine, the com-- bination of a vertically reciprocating transversely movable knife, and a paper holding clamp, with clamp operating screws, a transversely movable bar, means actuated by said bar for operating said screws, a rod or link operatively engaging said bar and extending transversely of the machine, a rod or bolt rigidly mounted upon the knife and having vertically sliding engagement with said rod or link, and means for restricting the extent of action of the rod or link upon the bar.

35. In a paper cutting machine, the combination of a machine frame, a paper cutting knife, and a paper holding clamp, with clamp operating means including screws, a transversely movable bar, means actuated by said bar for operating the screws, and means, including a lost motion connection, for operating said bar.

TALBOT C. DEXTER.

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