US2050350A

US2050350A - Paper feeding and cutting apparatus

Info

Publication number: US2050350A
Authority: US
Inventors: Abe H Markowitz
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-10-08
Filing date: 1934-10-08
Publication date: 1936-08-11
Anticipated expiration: 1953-08-11

Description

A. H. MARKOWITZ PAPER FEEDING AND CUTTING APPARATUS Filed Oct. 8, 1954 4 Sheets-Sheet 1 INVENTOR. A. H. MARKOWITZ.

ATTORNEY.

A 1936- A. H. MARKOWITZ 2,050,350

PAPER FEEDING AND CUTTING APPARATUS Filed Oct. 8,' 1954 4 Sheets-Sheet 2 INVENTOR.

A. H. MARKOWITZ.

WM @ma/ ATTORNEY.

A. H. MARKOWITZ PAPER FEEDING AND CUTTING APPARATUS 4 Sheets-Sheet 3 Filed Oct. 8, 1934 INVENTOR. A. H. MARKOWITZ ATTORNEY.

A. H. MARKOWITZ PAPER FEEDING AND'CUTTING APPARATUS Filed Oct. 8, 1954 4 Sheets-Sheet 4 INVENTOR. A. H. MARKOWI TZ.

Mm Q

ATTORNEY.

Patented Aug. 11, 1936 UNITED STATES PATENT OFFICE 27 Claims.

This invention relates to improvements in apparatus for feeding paper from a roll in a continuous strip, cutting it into various standard lengths and feeding the severed sheets to a print- 5 ing machine operable in synchronism therewith.

The object of my invention is to provide apparatus of practicable and relatively simple construction for supplying paper in a continuous web to any of the various types of portable printing 10 machines using stencils, type or other form of ink-impression or transfer, and to sever the paper prior or simultaneously to delivery to the printing machine'into any of the usual lengths.

Other objects and advantages residing in my invention, and objects relating to the details of construction and arrangements of parts thereof, will be readily apparent and fully set forth in the detailed description to follow.

The accompanyin drawings illustrate by way of example an operative embodiment of my invention, in which:

Figure 1 is a view in side elevation of an embodiment of my invention shown in relation to a printing machine.

25 Fig. 2 is a view in top plan of the same on a larger scale.

Fig. 3 is a view partly in longitudinal section and partly in side elevation.

Fig. 4 is a view in side elevation of that portion of the invention relating to the power transmission devices.

Fig. 5 is a detail view partly broken away and in cross-section of the knife-head element of the invention and associated parts.

35 Referring to said views, the reference numeral I indicates the horizontal bed-plate or table of my improved apparatus rigidly mounted on a supporting frame comprised of vertical and

horizontal members

2 and 3, respectively, or in any other 40 convenient and suitable manner.

The printing machine A is fixedly mounted at the forward end of said table while the carriage B of the paper feeding and cutting apparatus is slidably adjustable longitudinally of the table.

45 Said carriage comprises rigidly connected sideplates 5, 5' slidably mounted upon the table and having upon their inner sides adjacent their lower edges rack-toothed bars 6. A transverse shaft 1 is rotatably mounted in the frame immediately 5 below the table upon which toothed pinions 8 are keyed to engage the teeth of the respective racks and thus actuate the carriage through the manipulation of a hand-wheel I0 upon the outer side of the frame.

55 Guide-bars II are rigidly mounted upon brackets I2 secured to the table along which the sideplates of the carriage are in sliding engagement. A longitudinal slot I3 is formed in each saidbar and a pair of clamping-screws I are provided in each said side-plate engageable through the slots 5 I3 with'the respective guide-bar to secure the carriage at the desired working position.

The paper utilized in this apparatus is supplied in a roll, such as I5, mounted on an axially disposed arbor I! to rotate freely or with slight re- 10 sistance in the sockets I8 of a bracket secured to the frame. The strip of paper, indicated by broken lines 2| in Fig. 1, may thence pass about a suitable tensioning device, as shown at 22, and thence is directed upwardly and rearwardly to 5 engage about the peripheral surface of a main feed-cylinder 23 mounted for rotation at the rear of the carriage.

Said main feed-cylinder is keyed upon a rotary-driven shaft 25 projecting at both ends from 20 the side-plates 5, 5' in which it is mounted. A secondary feed-roller 26 of considerably smaller diameter than the cylinder 23 is rotatably mounted in parallel axial alignment thereover in bearing-blocks 21, the mandrel 28 of the roller pro- 25 jecting at one side upon which is keyed a gear 30 in mesh with a larger gear-wheel 3| upon the cylinder-shaft 25 of relative pitch-diameters in said gears so that the cylinder and the roller will rotate at the same. peripheral speeds. 30

Reliance is had mainly on the frictional contact of the paper strip upon the surface of the cylinder 23 for drawing the strip off of theroll I6 and advancing it at constant speed past the cutting appliances. To increase such area of contact an idler-roller 32 is provided in close proximity to the lower periphery-of the cylinder between which the paper strip is guided.

The bearing-blocks 21 are slidable vertically in guideways 33 in the side-plates and are urged upwardly tending to separate the roller 26 from the feed-cylinder by springs, not shown, positioned between the bottom of the respective bearingblock and the bottom of said guideways. A setscrew 35 is provided in the respective block-keepers 36 to depress the blocks and roller against the action of said springs to eflect the amount of separation between the cylinder'and roller desired The roller 26 is desirably adjusted in spaced relation to the cylinder 23 approximating the thickness 5 of the paper passing therebetween, thus serving as a guide to direct the paper steadily and horizontally toward the cutting devices and maintaining it unswervingly in alignment and. in a direct path.

31 indicates the main driving shaft on which the rotary paper-cutting appliances are mounted and it is rotated at a constant speed through a powerdriven sprocket-chain 38 in operative engagement with a sprocket-wheel 39 keyed to said shaft through power-transmitting connections to be hereinafter described.

Upon the opposite side of the carriage a gear- Wheel 40 is keyed to the shaft 3'! and which is in mesh with a toothed pinion 4| rotatably mounted on a stud 42. Interchangeable gears, such as of various pitch diameters to correspond, respecively, to the variations in speed-ratios desired between the feed-cylinder 23 and the drive-cutter shaft 31 to effect the feeding of the several lengths of paper, are mounted on said stud and are compounded with the pinion 4| to be rotated therewith. The stud may be provided with a springpressed sleeve 45 to confine the gears 43 in engaged position through an intermediate splitwasher 46.

A swinging yoke 41 is pivotally mounted at one end upon the shaft 25, extending forwardly, and is formed with an arctuate slot 48 adjacent its forward end through which extends a hand-nut 49 to secure the yoke at adjusted positions. An intermediate gear 50 rotating on a stud 5| extending from the yoke is in constant mesh with a gear 52 keyed on the shaft 25. The adjustability of the yoke admits of the meshed engagement of the year 50 with any of the change gears 43 and thus effects the driving of the cylinder 23 at varying rates of speed; depending upon the change gear 43 utilized, and in opposite rotary directions to that of the driving-shaft 31.

In Fig. 4 I have illustrated a preferred method of ensuring the proper meshing of the intermediate gear 50 with the various change gears 43,

consisting of a block 53 rotatably adjustable upon a stud 55 operable through a knob 56. Said block is formed with a plurality of fiat faces 51 arranged at different elevations with respect to the pivotal center of the block and which are respectively adapted to support the projecting end 58 of the yoke at the various radial positions thereof when the corresponding gears 43 are in operation. Said supporting faces are to be plainly marked to indicate with which gears they are corelated and hence safeguards the machine through the proper meshing of the gears when changes of gears are made by inexperienced operators. In said view the bottom of the slot 48 in contact with the handnut 49 serves as a stop for the accommodation of the gear 43 of smallest diameter and the top of said slot serves as a stop for the gear of largest diameter.

A supporting bar 59 for the stationary knife 59 is rigidly secured between the side-plates 5, 5 and includes aplane bearing-face 6| inclined upwardly and forwardly at approximately forty-five degrees from the horizontal. The knife is formed with a plurality of slots through which retaining-screws 52 secure it against said bearing-face and a plurality of setting-screws 63 are provided in screwthreaded bores in the bar 59 to engage the rear edge of the knife to effect such adjustments thereof as needed.

A knife-head 65 upon which the rotated knife 66 is mounted is rotatably borne upon the driveshaft 3'! and is cylindrical in general form having two oppositely disposed longitudinal ribs 51 and 68 extending therefrom, of which the rib 6'1 carries the cutting-knife 66 upon its substantially radially directed face and the rib 68 serves as a counterbalance therefor.

The knife 66 is secured through slotted holes to the bearing-rib 6'! by screws 10 admitting of proper adjustment of the knife. At about its midlength the knife-head is formed with a circumferential slot 'H extending thereabout for approximately 5 sixty degrees. A stop-pin 12 is fixedly secured in the shaft 31 and extends radially through the slot to limit the rotation of the knife-head on the shaft, as will be more fully explained.

At opposite ends of the knife-head 65 enlarged 10 cylindrical barrels I3, 13' are formed, the barrel 13 being formed with a tubular chamber '25 from its outer side. Within said chamber a coil-spring 16 is mounted under some tension, its inner end being secured to a button Tl projecting from the 15 shaft 3? while its opposite end is secured to a projection 18 extending into the chamber fro-m the inner periphery of the barrel-chamber I5. Said spring tends to resiliently urge the knife-head forwardly upon the shaft 31 within limits deter- 20 mined by the slot 1 I.

88 indicates a brake-bar pivotally mounted at one end upon a transverse rod 8| forming one of the cross-members of the carriage. Said bar is formed intermediate its length to the approxi- 25 mate curvature on its under side of the periphery of the barrel l3 and is provided with a brake-shoe 82 to contact therewith. A vertically disposed spiral spring 83 is secured at its lower end to a pin 85 extending from the side plate 5 and at its upper 30 end is engaged with a forwardly projecting extension 86 of the brake-bar to provide the required amount of friction upon the brakeshoe. A stopscrew 87 extends through the extension 85 and engages a stop 88 projecting from the side plate 5 35 to afford limitation to the frictional effect of the spring 83 and to absorb a portion of the shocks developed.

A cam-wheel 98 is adjustably mounted on the gear 48 upon which cam a. roller 9| is in engagement. Said roller is mounted upon a stud 92 extending laterally from the brake-bar 85 to engage and disengage the brake-shoe from the barrel E3 in response to the contours of said cam in conjunction with the spring 83. 45

The cam 96 is formed with its periphery for a major portion of its circumference set below a circular line which will engage said roller, hence the engagement of the brake-shoe 82 with the barrel i3 continues throughout this portion of the rotation of the shaft 31. Such resistance upon the knife-head will cause the retardation of the knife-head until the stop-pin 12 engages the forward extremity of the slot H whereupon the knife-head will travel at the same rotary speed as the shaft 81, the spring i6 being wound thereby to give an added tension.

At a predetermined point in the rotary travel of the knife-head, at approximately the point where the contact of the two knives is made to sever the sheet, an elevation 93 is formed in the contour of the cam 99 preceded by an inclined portion 94, which elevation is slightly above a circular line which will engage the roller 9! and cause the lifting and release of the brake-mechanism from'its engagement with the barrel F3 whereupon the spring '55 will assert itself to impel the knife-head at a faster speed than the constant rotary speed of the shaft 3'! and until the pin E2 engages the rear extremity of the slot H, at or about which point the elevation 93 is reduced, to below the circular line whereat it is in contact with the roller and thus cause the brake to move into engagement with the barrel 13 and again wind the spring 16 through the retarding of the knife-head preparatory to making another cut in the paper sheet at its next revolution.

It will be seen that the cutting-edge of the stationary knife 60 is located in the horizontal plane of the paper-strip 2I moving forwardly upon the supporting plate 96 and which is somewhat in rearward of a vertical line drawn through the axis of the shaft 31 so that the knife 66 will contact therewith near the termination of its downward travel. But in such advantageous arrangement the knife 66 passes downwardly beyond the line taken by the advancing paper-strip after a sheet has been severed, hence should the knife travel at the speed governed solely by the shaft the paper-strip would strike thereagainst and be caused to buckle and defeat the purposes intended. As the rotation of the shaft 31 is maintained at a constant speed and the knife performs its cutting operation at each revolution thereof while the feed-cylinder 23 travels at a surface speed considerably in excess of that of the knife-head the advantage and importance of speeding up the rotary knife immediately or a short interval before making the severing cut and for a portion of its travel thereafter will .be clearly evident.

The driving mechanism for actuating the paper-feeding and cutting apparatus and associated printing machine in synchronism will be readily understood. An electric motor 91, see Fig. 1, is mounted in the frame and is connected by a belt 98 to drive a pulley I keyed to a shaft i0I. From a relatively small pulley I02 on the shaft IOI power is taken by a belt I03 and transmittcd to a larger pulley I05 keyed on a shaft 586. A shaft I 37 mounted in parallel with the shaft I06 is driven by a gear I08 from a gear IIO of the same dimensions on the shaft I06.

Sprocket wheels III and II 2 on the shafts I06 and 37, respectively, are thus driven in opposite directions and are operatively connected by sprocket-chain 38 to the sprocket-wheel 39 of the shaft 31 and by the sprocket-chain I I3 to the sprocket-wheel I I5 of the printing-machine controlling the rotation of the printing-cylinder IIS and the various ancillary movements and functional parts of the machine.

In the operation of the machine and upon the determination as to the length of the sheets of paper to be cut the carriage is first adjusted upon the table with relation to its distance from the stop and gripping devices of the printing ma.-

chine and particularly from the disappearing paper-stop I I! thereof.

For convenience in setting the cutting machine the table I is provided with a series of calibrated lines and indices II8 therefor indicating the various standard or other lengths of paper which the apparatus is adapted to out while a corresponding line I20 upon the side-plate 5 denotes the datum line from which the measurements are calculated and which is set in register with the proper line I I8.

The carriage is moved by means of the handwheel I0 and is secured in rigid condition by the screw-clamps I5. The proper change gear 43 is then mounted on the stud 42 to rotate with the pinion GI whereupon the yoke 41 is adjusted upon the respective face of the block 53 to bring the gear 50 into meshed engagement with the gear 4-3 and thus through the meshing of the gears 50 and 52 upon the shaft 25 to drive the feed-cylinder 23 in an opposite rotary direction to that of the knife-head.

Also it will be appreciated that the several change gears 43 each drive the feed-cylinder at a different surface speed corresponding to the various lengths of paper to be cut and indicated by the lines I I 8, the cylinder advancing the paper a given length varying with the size ofgear 43 employedwhile the shaft 31 whose speed remains 5 unchanged makes a single revolution.

The strip of paper 2I is threaded upwardly from the roll I6 as described and about the feedcylinder forwardly over the plate 96 and past the knife 60. The motor then being energized 10 to actuate both the cutting and printing apparatus the paper will be fed forwardly by the cylinder 23 at a uniform speed in excess of the rotary speed of the knife-head, excepting momentarily when the knife-head is free to rotate at a higher speed under the action of the spring I6.

Thus upon a predetermined length of paper passing beyond the stationary knife 60 which length is governed .by the selected gear 43 the rotaryknife 66 will have made a complete revolution since cutting the preceding sheet and will sever by 'a straight chopping cut or slightly shearing action with respect to the stationary knife the new sheet While the paper strip continues its progress uninterruptedly.

The forward edge of the severed sheet will engage against the disappearing stop II 'I of the printing machine, being impelled slightly forwardly and. downwardly upon the apron I22 by 30 the forward and downward travel of the rotary knife, sufficient allowance of distance. between the knife and said stops being afforded to cause the paper sheet to abut squarely upon the stops III. In the continued progress of the cycle of 33 operations of the printing machine said severed sheet will then be gripped by the gripping-segments I23 acting in conjunction with the rollers I25 and advanced to the printing position beneath the printing cylinder I I6 upon the momentary disappearance of the stops 7. The sheets will thus be severed and fed to the printing machine as they are cut, and at full speed, the printed sheets being delivered upon an extension I26 of the supporting frame.

The forward movement of the paper-strip 2I continues uniformly hence the desirability of speeding up the rotation of the knife-head about the portion of its travel when the paper is cut to avoid interference of the knife 60 with the progress of the paper-strip and to effect the final stage of feeding the severed sheets to the printing, mechanism. The exact point in the rotary travel of the knife 06 when the knifehead isreleased may obviously be adjusted by the proper positioning of the cam 90.

In order to maintain the surface of the feedcylinder 23 free of fibers and other foreign matter that may be deposited thereon from the paper moving thereover a U-shaped wiper-bar I21 is 60 provided in which a strip I28 of felt, or other suitable material, is retained in contact with the periphery of the cylinder. Said bar is supported by arms. I29 rigid with a' tubular body I 30 rotatively mounted upon a transverse circular rod 65 I3I rigid in the carriage. Said arms and body may be spring-pressed to cause the wiper-strip to bear resiliently against the cylinder. An arm I32 extends from the body I30 having a roller I33 at its extremity adapted to engage a cam- 70 ring I34 under the spring pressure upon said body. Said cam-ring is rotatable with the cylinder .23 and is formed with a gap I35 therein. Said wiper may thus be in wiping contact with the cylinder for the greater part of its revolution 75 but at the point in its rotation corresponding to the juxtaposition of the gap and roller .of the ring I36 and arm I32, respectively, the wiper is sharply separated from the cylinder with the effect of shaking oif such dust and foreign matter as may have been wiped off.

Having described my invention, what I claim,

1. Paper feeding and cutting apparatus for printing machines, comprising a. stationary cutting-knife, a rotating drive-shaft driven at a constant speed, a knife-head mounted upon said shaft to rotate therewith having a cutting-knife fixedly mounted therein cooperative with said stationary knife, a feed-cylinder rotatively actuated from said shaft, the rotative speed of said knife-head being less than the surface speed of said feed-cylinder for the major portion of its travel.

2. Paper feeding and cutting apparatus for printing machines, comprising a stationary cutting-knife, a rotating drive-shaft driven at a constant speed, a knife-head mounted upon said shaft to rotate therewith having a cutting-knife fixedly mounted therein cooperative with said stationary knife, a feed-cylinder rotatively accuated from said shaft, the rotative speed of said knife-head being less than the surface speed of said feed-cylinder for the major portion of its travel, and with speed in excess to the surface speed of the feed-cylinder for the remaining portion of its travel.

3. Paper feeding and cutting apparatus for printing machines, comprising a stationary cutting-knife, a continuously rotating drive-shaft, a cutting-knife cooperative with said stationary knife mounted on said shaft to rotate within fixed limits thereon, a feed-cylinder rotatively actuated from said shaft, the rotative speed of said rotating knife being less than the surface speed of said feed-cylinder for the major portion of its travel, and with speed in excess to the surface speed of the feed-cylinder for the remaining portion of its travel immediately following its paper-severing contact with said stationary knife.

4. Paper feeding and cutting apparatus for printing machines, consisting of a carriage, a feed-cylinder rotatively mounted in the carriage and arranged to draw a strip of paper from a roll and advance it continuously, a drive-shaft rotatably journaled in the carriage and actuated at a constant speed, means to drive said feedcylinder from said drive-shaft at selected speeds, and cutting appliances interposed in the travel of said paper strip, said cutting appliances including a knife-head and cutting-knife rotatably mounted upon the drive-shaft the rotative speed of which is less than the surface speed of said feed-cylinder for a portion of each revolution, and in excess thereof for the remaining portion of each revolution.

5. In paper feeding and cutting apparatus, a drive-shaft, means for rotatively actuating said drive-shaft at a constant speed, a knife-head mounted on said drive-shaft and rotatable within fixed limits thereon, spring-actuated means to ur e said knife-head in the same rotatory direction as the drive-shaft, means to retard the motion of said knife-head upon said drive-shaft to increase the spring-tension thereon, and means to release said knife-head at a predetermined point in each revolution of the drive-shaft to give accelerated motion to said knife-head.

6. In paper feeding and cutting apparatus, a

drive-shaft, means for rotatively actuating said drive-shaft at a constant speed, a knife-head rotatively mounted on said drive-shaft, means to limit the rotative movement of said knifehead relative to said drive-shaft, spring-actuated means to urge said knife-head forwardly in the rotary direction of the drive-shaft, brakingmeans operable upon said knife-head to retard the motion of said knife-head upon the driveshaft and thereby increase the spring-tension therebetween, and means operable in each revolution of the drive-shaft to release said brakingmeans to admit of said spring-means asserting itself to drive said knife-head at a speed in excess of that of the drive-shaft.

'7. In paper feeding and cutting apparatus, a drive-shaft, means for rotating said drive-shaft at a constant speed, a knife-head mounted on said drive-shaft to rotate therewith and for a limited extent capable of rotation relative to the drive-shaft, a spring connected at its opposite ends to said drive-shaft and to knife-head and tending to urge the knife-head forwardly in the same rotary direction as the drive-shaft, a brake engageable with said knife-head to retard the motion of said knife-head upon the drive-shaft and to increase the tension of said spring, and means to effect the application and release of said brake in each revolution of the knife-head to respectively retard and accelerate the motion of said knife-head with respect to said driveshaft.

8. In paper feeding and cutting apparatus, a drive-shaft, means for rotating said drive-shaft at a constant speed, a knife-head mounted on said drive-shaft, means to drive said knife-head from the drive-shaft admitting of limited independent motion of the knife-head in the rotary direction of the drive-shaft, a spring connected at its opposite ends to said drive-shaft and to the knife-head and tending to urge the knifehead in the same rotary direction as the driveshaft, a brake engageable with said knife-head to retard the motion of the knife-head upon the drive-shaft and to increase the tension of said spring, and means to effect the application and release of said brake in each revolution of the knife-head to respectively retard and accelerate the motion of the knife-head with respect to the driveshaft, said means consisting of a cam rotatable with the drive-shaft, and a roller contacting therewith operatively connected to said brake.

9. In paper feeding and cutting apparatus, a drive-shaft, means for rotating said drive-shaft at a constant speed, a knife-head rotatably mounted on the drive-shaft having a slot therein to receive a pin extending from the driveshaft, said slot and pin admitting of limited rotary movement of the knife-head relatively to the drive-shaft, a spring connected at its opposite ends to said drive-shaft and to the knifehead and tending to urge the knife-head in the same rotary direction as the drive-shaft, a brake engageable with said knife-head to retard the motion of the knife-head upon the drive-shaft and to increase the tension of said spring, and means to effect the application and release of said brake in each revolution of the knife-head to respectively retard and accelerate the motion of the knife-head with respect to the driveshaft, said means consisting of a cam rotatable with the drive-shaft, and a roller contacting therewith connected to said brake.

10. Paper feeding and cutting apparatus for means to urge said knife-head in the rotary direction of the drive-shaft, means to retard the motion of the knife-head upon said drive-shaft and to thereby increase the spring tension thereon, a feed-cylinderarranged to draw a strip of paper from a roll and advance it between said knives to be severed thereby, means to actuate said feed-cylinder from said drive-shaft, and means to release said retarding means to accelerate the travel of the knife-head upon the drive-shaft at a selected point in each revolution thereof.

11. Paper feeding and cutting apparatus for printing machines, consisting in combination with a printing machine fixedly mounted upon a table and provided with stop and gripping devices to receive and advance the severed sheets of paper for printing, of paper feeding and cutting apparatus comprising a carriage adjustably mounted on the table, a feed-cylinder rotatively mounted in the carriage for drawing a strip of paper from a roll and advancing it towards the printing machine, a drive-shaft arranged to be rotated at a constant speed, a knife-head revoluble on said drive-shaft and independently rotatable thereon for a limited extent, a knife rigidly connected to said knifehead, a knife fixed in said carriage in cutting relation with said first named knife, and means to drive said feed-cylinder from said drive-shaft, and at a higher rate of surface speed than the rotary travel of said first named knife as driven by said drive-shaft.

12. In paper feeding and cutting apparatus, variable speed power transmission devices including a, train of gears, one gear of said train being selective to various diameters to obtain the desired speed variation, a gear of said train meshing with said selective gear being rotatively mounted upon a swinging yoke, said yoke being pivoted at one end and arranged to be adjustably secured at its opposite end, and a rotatively mounted block formed with a plurality of faces arranged at various distances with respect to the axis of the block and corresponding, respectively, with the diameters of said selective gears, said faces being arranged to support and gauge the outer end of said yoke to effect the desired meshing of said gear carried thereon with said selective gears, respectively.

13. Paper feeding and cutting apparatus, including a driven shaft, a knife-head mounted to rotate therewith and capable of relative rotary motion thereon within fixed limits, and a spring connected at its opposite ends to said shaft and to said knifehead.

14. In paper feeding and cutting apparatus, a rotatable shaft, a knife-head rotatively mounted on said shaft, and means to retard and accelerate the motion of said knife-head relative to the speed of said shaft in each revolution.

15. In paper feeding and cutting apparatus, a rotatable shaft, a knife-head rotatively mounted for independent movement within fixed limits upon said shaft, and means to retard and accelerate the motion of said knife-head relative to the speed of said shaft in each revolution.

16. In paper feeding and cutting apparatus, a rotatable shaft, means for rotatably actuating said shaft at a constant speed, a knife-head rotatively mounted for independent movement within predetermined limits upon said shaft, and means to retard and accelerate the motion of said knifehead relative to the speed of said shaft in each revolution.

17. In paper feeding and cutting apparatus, a rotatable shaft, means for actuating said shaft at desired speed, a knife-head rotatively mounted for independent movement within predetermined limits upon said shaft, and means to retard and accelerate the motion of said knife-head relative to the speed of said shaft in each revolution.

18. In paper feeding and cutting apparatus, a rotatable shaft, means for actuating said shaft at constant speeds, a knife-head rotatively mounted on said shaft, stops to limit the rotation of said knife-head upon the shaft, and means to successively retard and accelerate the motion of the knife-head relative to the speed of theshaft in each revolution within the limits determined by said stops.

19. In paper feeding and cutting apparatus, a rotatable shaft driven at constant speeds, a knife-head mounted on said shaft for relative rotation within predetermined limits, and means for intermittently driving the knife-head at speeds in excess to the speed of said shaft, said means consisting in a spring connected at its opposite ends to said shaft and to: said knife- 30 rotatable shaft, means to drive said shaft at 35 constant speeds, a rotatably mounted knife-head on said shaft adapted for limited independent rotary motion thereon, and a. spring connected at its opposite ends to said shaft and to said knife-head.

21. Paper feeding and cutting apparatus, including a rotatable shaft, means for driving said shaft at constant speed, a knife-head mounted for limited rotary motion on said shaft, a spring arranged to rotatably actuate said knife-head upon said shaft, and means to alternately apply additional tension to said spring and to release the knife-head under such tension in each revolution of the shaft to cause said knife-head to rotate intermittently at a speed in excess to the speed of the shaft.

22. Paper feeding and cutting apparatus, including a driven rotatable shaft, a knife head mounted upon said shaft to rotate therewith and capable of relative rotary motion thereon within fixed limits, tension means interconnecting said shaft and said knife-head, and means to alternately increase and release the tension of said tension means in each revolution of the shaft to respectively retard and accelerate the motion of said knife-head relative to said shaft,

23. Paper feeding and cutting apparatus, including a driven shaft, a stationary knife disposed in parallel with said shaft, a knife-head mounted on said shaft to rotate therewith and relatively thereof within predetermined limits, and a knife mounted on said knife-head in cutting relation with said stationary knife. v

24. In paper feeding and cutting apparatus, a stationary knife, a rotatable shaft driven at a constant speed, a knife-head mounted upon said shaft having a cutting-knife secured thereon cooperative with said stationary knife, and means to accelerate the rotative speed of said knifehead during each revolution relative to the speed of the shaft.

25. In paper feeding and cutting apparatus, a stationary knife, a rotatable shaft driven at a constant speed, a knife-head mounted upon said shaft having a cutting-knife secured thereon cooperative With said stationary knife, and means to accelerate the rotative speed of said knifehead at a predetermined point in each revolution relative to the speed of the shaft.

26. Paper feeding and cutting apparatus, including a driven shaft, a stationary knife disposed in parallel with said shaft, a knife-head mounted on said shaft to rotate therewith and relatively thereof within fixed limits, a knife secured on said knife-head in cutting relation with said stationary knife, and means to accelerate the rotative speed of said knife-head in each revolution relative to the speed of the shaft.

27. In paper feeding and cutting apparatus, a stationary knife, a rotatable shaft driven at a constant speed, a knife-head mounted upon said shaft, a cutting-knife secured on said knife-head cooperative with said stationary knife, means to feed a strip of paper at a constant speed to be severed by said knives, and means to accelerate the rotative speed of said knife-head during each revolution relative to the speed of the shaft prior to the paper-severing contact of said knives.

ABE H. MARKOWITZ.