US1942521A - Paper cutter - Google Patents

Description

Jan. 9, 1934. w. l.. VALIQUETTE 1,942,521

PPPPPPPPPP R Jan. 9, 1934. w. L. `VALIQUETT PAPER CUTTER Filed July 26, 1,930 7 Sheets-Sheet 2 INVENTOR. All@ 20W A TTORNEYS Jan. 9, 1934.

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PAPER GUTTER Filed July 26, 1930 '7 Sheets-Sheet 6 IN VEN TOR.

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Jan. 9, 1934. w. 1 VALIQUETTE PAPER CUTTER Filed July 26, 1930 7 Sheets-Sheet '7 INVENTOR. zum@ Zuzz:

A TTORNEYJ` Patented Jan. 9, 1934 UNITED STATES PATENT OFFICE Harris Seybold Potter Company, Daim,

Ohio, a corporation of Delaware Application `uly 26, 1930. Serial No. 470,924

17 Claims. (Cl. 164-59) This invention pertains to that class of paper machinery known as trimmers or cutters, and speciiically to the mechanism controlling the cutting up of paper in the different sizes, and

also to the trimming of the piles of paper stock.

In such paper cutters the stock is usually fed or moved toward the knife either by a hand feeding arrangement to the cutting line or, if by power, to an approximate distance, the final close adjustment to size being by the hand feeding arrangement.

It is my object, in the machine disclosed herein, to provide mechanism by which the paper stock, after being trimmed to size is then fed by power to the knife in a step by step movement without the operator making a final close adjustment, the sizes being determined and set up in the machine previous to the cutting of the stock, and thereafter being automatic so long as the predetermined size is to be cut over and over again.

Another object is the provision of means for setting up within the mechanism of a second size, or sequence of sizes to be cut, and for .bringing this mechanism into use as desired.

A still further object is to provide means for automatically locking the operating buttons so that the functions of the machine can only be performed by following a prescribed, predetermined cycle of movements.

I also provide a novel arrangement of electric circuits to prevent damage of certain parts of the machine by over-travel or by carelessness of thev operator. 4

The above and other novel features which will be developed in the specication, I provide in the machine of which I have shown a preferred modification.

Referring to the drawing:-

Figure 1 is a front perspective of a paper cutter having my improvements thereon.

Figure 2 is a front elevation of so much of the mechanism as pertains`to this invention.

Figure 3 is a side elevation part section onA line of the traversing mechanism for the back gauge.

Figure 4 is a side elevation of the adjustable step by step mechanism.

Figure 5 is a plan of the feeding mechanisms for the back gauge.

Figure 6 is a plan showing the chain and its connections with the back gauge and the electric circuits.

Figure 7 is a vertical transverse section on line A, Figs. 1 and 5 of the worm gear and crank construction.

Figure 8 is a horizontal section of the roller ratchet drive, taken on line B of Figs. 1 and 3, some of the parts being left in elevation.

Figure 9 is a diagram of the electrical circuits.

Referring first to Fig. 1 I have provided the usualv frame members of a paper cutter or trimmer shown'at 1, the usual table top at 2, having slidably mounted to the rear of the knife 65 3 the usual back gauge 4. This back gauge is so mounted as to be capable of forward or rearward adjustment. At the rear of the knife is also shown the usual hold-down or clamp 5.

The back gauge 4 is connected to a chain 6. 70 This chain is endless and passes around a driving sprocket and an idler sprocket, later to be described, and it follows that if the back gauge 4 is in its extreme rearward position and is adjusted forward by manipulation of the chain 6, 5 either by hand or by power, it will feed the stock forward to the knife. Thus far the adjustment of the back gauge forward coincides with standard practice. In this present invention there is added a mechanism whereby the size of the o cut for the stock having been determined, the cuts are automatically, successively made and repeated over and over again so long as the selected sizes are to be cut.

Referring now to Fig. 3, a bracket 7 is bolted 85 tothe frame l of the machine, this bracket being a support for the traversing mechanism for the back gauge li. A shaft 8 is mounted in bearings 9 of the bracket 7. Mounted on the shaft and fast thereto is a quill member 10. This quill member has mounted uponit, with a running t, a worm gear 11. At the upper end of the quill member 10 a toothed sprocket wheel 12 is keyed, this sprocket engaging with the chain 6. Mounted below the sprocket wheel 12 and above the worm gear l1 is a roller clutch acting like a ratchet 13, the inner member 19 of this roller ratchet 13 being fast on the quill member l0. Below the worm gear 11 a second roller ratchet clutch l5 is mounted on the quill member 10. This roller clutch 15 is of the same construction as the roller clutch 13, so that in this specification the detail description will be confined to the upper roller clutch 13.

Interposed between the upper roller clutch 13 and the worm gear 1l is a flanged collar or clutch member 16. This flanged collar is keyed on the quill member 10. A series of pins 17 extend from a flanged collar 16 and project with a loose t downwardly into the hub of the worm gear 11,

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their upper ends projecting upwardly above the flanged collar 16 and adapted, if the flanged collar 16 be lifted, to engage a series of holes 18 in the quill member 16. A forked lever 19 is mounted across the front of the flanged collar 16, and has roller pins 20 engaging the groove formed by the flanges of the collar 16. llhis forked lever has a handle 21 for operative purposes.

A shaft 22 is mounted in bearings 23 carried by the main bracket 7. Fast upon the shaft 22 at the front and meshing with the worm gear 11, is a worm 24. Mounted at the left of the worm is a taper-groove pulley 25. To the rear of this pulley and bolted to the under side of the table 2, is an electric motor 26, having a grooved pulley 27 in line with the grooved pulley 25, the motor being adapted, when a taper belt 28 is placed upon the pulleys, to drive the worm 24 and worm gear 11 at a speed suitable for rapid traverse of the back gauge either forward or reverse, as will be hereinafter explained.

Assuming that the motor has been started in the usual manner, and is driving the worm gear 11 at a rapid speed, if the lever 21 is operated, the forked lever 19 will lift the flanged collar 16 and with it the pins 17. The upper ends of the pins 17 will'thenrenter the holes 13 in the quill member 19, and thus drive the quill member and the sprocket wheel 12 keyed to it, thus furnishing motion to the chain 6 which, at the rear, runs around an idler sprocket 29. The back gauge 4, as shown in Figure 6, is fastened at a suitable point to the chain 6 by a depending clamp 30. The clamp 30 extends through the usual slot 31 in the table top 2. This permits the back gauge 4 to be rapidly moved forwardly or rearwardly as the motor is run forward or reverse, it being understood that the motor is of the reversing type. Ifa very fine adjustment is to be made of the back gauge, it may be run to its approximate position by the motor, the motor stopped, and the final adjustment made by the hand wheel 32, which is fast on the shaft 22.

Referring to Figs. 1, 4 and 5, a bracket 33 is v bolted to the frame 1 and extends forwardly, and carries in its forward part a vertically alined pair of bearings 34 and 35.

The worm gear 39 has a pair of upwardly and downwardly extending hubs 40 and 41 which fit in the bearings 34 and 45. Mounted in horizon- 'tally alined bearings 43 on the bracket 33 in front of the worm gear 39 there is a shaft 44 having mounted upon it between the bearings 43 a worm 45 meshing with the worm gear 39. A cap piece 46 completes the enclosure of the worm and worm gear structure.

Referring to Figs. 4 and 7, there is a hole 49 bored entirely through the worm gear 39 and its hubs 40 and 41, and a crank member 50, has an extension 51 which fits the bore of the hubs of 'the worm gear 39 and is keyed therein as indicated at 52. To prevent possibility of the crank member 50 working olf endwise, a pin 53 is extended through. the hub 40 and the extension 51 of the crank member 50. A second crank member 54 is mounted in the same way in the bottom hub 40 of the worm gear 39 the construction of the lower crank 54 being similar to that of the upper crank member 56.

`The upper crank member 50 has a T slot 50a formed therein in which there is an adjustable stud 56 which has a threaded hole in its head portion 57. Mounted in the end of the crank member, 50 is an adjusting screw 58 which extends throughthe threaded hole of the head 57 Of the stud 56 and has its outer end guided in a bearing 59 in the end of the crank member 50. The construction described permits a ready adjustment of the stud longitudinally in the T slot 50a of the crank member 56.

Mounted on the stud 56 is a connecting rod 60 which is held in place by a nut and washer 61'. When it is desired to adjust the stud 56 and the connecting rod 66 along the T slot, the adjusting screw 53 is turned to move the stud 56 in the selected direction and distance, thus changing the throw of the crank member 50, and consequently the travel of the connecting rod 60.

A second connecting rod 62 is mounted in like manner on the crank member 54, the centers of throw for the two crank members 59 and 54 being 136c apart, so that the two crank members are balanced.

At the right side of the bracket 33 a block 63 is bolted. Mounted on the right end of the shaft 44, as indicated, there is a flanged pulley 64. Clamped on top of the block Y63 there is a strap 65 which extends half way around the flanged pulley 64 and is fastened to ak plate 66 which has a rod 67 which is threaded at its outer end and extends through a hole in the block 63. A spring 68, which is adjustable with nuts 69, is mounted on the rod, and the whole assembly furnishes a means by which a constant, adjustable drag is maintained against the rotation of the shaft 44.

Referring now to Figs. 1, 3, 5 and 8, the forward step by step drive for the back gauge will be described. The upper roller clutch spacer drive member 13 has a series of nat faces 70 milled in its side walls with slots 71 which extend inwardly towards the quill member 10, but not 'radially thereto and bolted to the flat faces and bridging across the slots 71 are lever supporting blocks 72 which have a central slot 73 for a lever 74. Mounted on a pivot pin 75 which extends from side to side of the lever supporting blocks 72, are the levers 74 which have inner ends formed like fingers which extend into the slots 71.

The levers 74 extend outwardly and are pivotally fastened to a releasing ring 77.

Seated in the slots 71 there are rollers 78 which are of greater diameter than the narrow part of the slots 71, as seen in Fig. 8, and which are held from dropping out by a plate 78h as shown in Fig. 3. The rollers 78 are being urged continually by a spring 78a toward the narrow part of the space between the lever supporting blocks 72 and the quill part 10. The spacer drive member 13 has a projecting ear 79 Which has a hole in it which receives a stud 30. One end of the connecting rod 69 is mounted on this stud 80, and the opposite end is connected to the crank 55 of the crank member 55.

If a size for the sheets to be cut is determined, for example 8 by 11 inches, the stud 56 in the crank 55 is set a proper dist-ance from the center of the crank 55 to give a throw of 11 inches.

This being done, if the crank 55 is moved one revolution by any means in the direction of the arrow (Fig. 5), it will traverse the roller clutch member 13 in the direction of the arrow, as shown in Figs. 1 and 3, a distance equal to the throw of the crank 55. When the roller clutch member e starts its movement to the right, the pins 78 are immediately gripped between the blocks 72 and the enlarged portion of the quill shaft 10, which causes the quill shaft 10 to move with the roller clutch, and this movement causes the sprocket 12, which is fast on the quill shaft 10, to move also. The chain 6, and thus the back gauge 4 which is fast on the chain 6, move the exact distance for which the throw of the crank was set, in this assumed case l1 inches. As the crank 55 passes its extreme point of throw, the movement of the connecting rod is reversed and it starts to return to the starting point and thus becomes a push instead of a pull rod. This change in the direction of movement releases the rollers 78 in the clutch member 13, and the ratchet member 13 is returned to its original position, the other parts of the mechanism remaining in the advanced position. Thus it is seen that if the roller clutch be advanced a selected distance, step by step, the paper stock will also be advanced to the cutting point step by step a selected distance, in this case 11 inches.

Referring now to Fig. 2, the other roller clutch 15 has a second crank member 54 connected by a connecting rod 62. This assembly forms a sizing unit similar to the one described. This second unit may be set for a lesser size stroke than the unit 13, and since I have assumed a size of 8 inches for the lesser cut, we will consider that the crank member 54 has its connecting rod stud set to produce an 8 inch stroke.I

In this second instance the functions of the connecting rod 62 .are the reverse of those of the connecting rod 60 as the initial or power stroke is a push, while the idle part of the stroke is ya pull.

It will also be .seen that the longer .stroke clutch will dominate the amount of advance given the back gauge so long as it is free to do so, as there is nothing in the clutch construct-ion to prevent the upper clutch 1'3 from moving the sprocket 12 the 11 inch stroke as the rollers 78' on .the lower clutch will immediately release as the quill member 10 continues to move to the left in the direction y.of the -arrow and because the `shorter stroke is completed iirst. Provision, however, has been made to overcome this difficulty as will be seen by reference to Fig. 8.

The ends of the levers 74 are pivoted in a ring '77, and this ring may be grasped by the `operator and .turned to the right .so that the levers will rock on their pivots '75 and the inner ends 81 will hold the .pins '78 away from the narrow part Yor .the slots v'71. Thus if the connecting rod moves the clutch `member the ymovement is ineffective as the rollers :cannot become wedged in the slot, which would be necessary to .drive the quill shaft.

From the above it will be understood that the operator, having cut his stock into a group of strips 1l inches wide and as long as the stock, say 64 inches, is ready to cut the 8 in. way. The second roller clutch 15 :having lbeen set for 8 inches, as has been described, the stock is :placed in the machine, presuming for the movement 'that the back .gauge has been returned to the ,rear of the machine, the long part of the ystrip going to the rear and the .piles of stock 'abutting the l1 in. way.. vThe operator then turn-s the -ri-ng '77 :on the `upper clutch, thus causing the pins 7.8 to be ineiective, and -if the ylower .crank member 54 is moved, the piles .of stock will be fed forward 8 inches and cut.

The driving means for the crank members is-an individual motor on a lseparate circuit, and this mechanism makes but :one revolution and comes to 1a stop each time a out is made. A yseparate power plant for the machine proper is then brought into play and the cut is Ymade :through the stock. The power for the rapid traverse, which has been described, is also a separate unit.,l and I have further provided a safety dev-icc betweenthe rapid traverse and the step. by step mecha nisnis which prevents accidental injury t@ the' mechanisms.

Referring to Fig. 2, on the left end cf the crank member 55 there is a projecting stop 82 which, swings in the path of a Switch trigger 83 0f a switch 84. switchy 84 is mounted on the frame of the machine in the path of the crank member 55.

At the commotion of the Stroke 10i the crank, member the stop '82 strikes the trigger 83, which causes said automatic switch 84. to break .the ein @uit and stop the motor. A Startins button switch 85 is provided to start the step by step units into operation again for the next spacing movement.

One of the uses o1" handle 2l, as shown in Figs. 2 and 3, and of the lever 19 has been described,

'and the other functions connected therewith will now be described.

Extending from the side of the lever 19 there is a stud 86. Mounted on this stud a link 87 is connected to a bell crank lever 858, carried 1b.?!v part of the traverse assembly at 89.. The upper end of this bell crank lever has a Slotted hOle to receive a pin. A slide -91 is Icarried 'by a pai-r' of guide pieces 92 on the front of the table 2. This slide has 4a series of holes which register a number of .control switches 85a, 9.3 and 94 located on the iront .of the table.

Some of these holes are out of .registry with some of the switches, but they are registry with others. When the lslide is moved .a short distance, the holes which are in registry in 121,06

former position are moved out of registry, and the switches which were previously covered are exposed in operative position.

Extending from the slide 91 there a .93 which projects into .the slotted hole .9.0 in the lever 88. As constructed, anymovemen-t of handle 21 will rock the ybel-l y,crank lever .8.8 .and thus shift the slide to `diff,er-ent positions .of

registry with the various .switches -on .the front of the table 2. An examination of Fig. 2 will in dicate that, Vas shown, the starting yswitch button 85 is exposed for the 'step by step actuating motor., Vand the button 85a .controlling the for ward rapid traverse motor is also exposed. It is, therefore, possible to operate the sliep by `step mechanism, but the exposed forward rapid traverse button is inoperative, because Aunless the two roller ratchet releasing rings '.77 and 94a :are set, the rollers 7:8 of the roller .ratchets are in neutral, and the .circuit to the rapid traverse motor is thus broken.

Referring to Figs. 5 and 3 -one .of the jli'n .releasing levers 74 has a Vstrike portion 103 on one side.. The strike :por-tion, when .the ring :77 is moved to the right to releasing position for the nollers 78, comes into contact with a switch `button 104 Yoi an electric switch 105. As is Iusual, .this button contact 1,04 is .self-restoring when released. The depressing .of the switch Abutter-1 L04 closes the circuit to :the motor 26 operates the rapid traverse, but does not start the motor 26 as this is accomplished :by .depressing .either .of the switch buttons 93' or 94. 'Bolted to one of the iiat faces 70 there is an angle shaped bracket 10.6

which has, `at -its louter lend, .a :spring `operated detent pin 107 snaps .into these notches .and holds the ring in one or the other of its operative positions, and at the same time holds the switch button 104 depressed. Thus it will be seen that it is not possible to use the rapid traverse for advancing or retracting the back gauge unless the rings are turned to the right, releasing the rollers 78, and thus making inoperative the step by step mechanism, and closing the circuits for the use of the rapid traverse when the proper starting button 93 or 94 is depressed.

Proceeding with the description of slide 91, if the operator is desirous of rapidly traversing the back gauge for any reason, he then must rst set the two roller clutch rings 77 and 94a in their neutral position, as has been explained, and then operate the handle 21 so as to throw the rapid traverse flanged collar or clutch member into engagement with the sprocket drive. The mo-vement of the handle 21, operating the bell crank lever 88, moves the slide tor the right and covers up the starting push button 85 of the step by stepmechanism, and uncovers the reverse push button 93 and the stop push button 94. It is then impossible to start the step by step mechanism, and the operator can only operate the back gauge at rapid traverse or use the hand wheel 32 for ne adjustments. To prevent any possibility of damage to the machine by carelessness on the part-of the operator, while traversing the back gauge forwardly or reversely, a series of safety stops are provided which are mounted on the chain 6.

Referring to Figs. 6 and 9, a stop switch 95 of usual switch construction is fastened to the under side of the table in a position to be tripped by a stop block 96 fastened on the chain 6 as the back gauge 4 is traversed to the rear to thus prevent the gauge from being run off the table top.

A second switch 97 is mounted on the under side of the table 4 and a second stop block 98 secured on the chain 6 is arranged to strike the switch trip and prevent the back gauge, in its forward travel, from striking the knife or clamp.

In order to prevent the step by step mechanism from advancing the back gauge beyond a forward danger line, a stop switch 99 is bolted to the under side of the table 2 in line with the chain 6. A stop block 100 mounted on the chain 6 strikes this switch 99 and thus stops the motor and the forward advance of the back gauge.

To assist the stopping of the back gauge 4 and to prevent the back gauge from over running its stop position, a pair of spring pressure operated brake rods 101, which have pressure shoes 102 in contact with a band on the sprocket wheels 12 and 29, are mounted on the under side of the table 2. l v

While it is preferred to employ the construction and arrangement of'parts shown and described in embodying the invention in a machine of the manufacturing type, it will be understood that this construction and arrangement is not essential to the broader features of my invention, and may be varied or modified as found desirable or as best suited tothe construction and arrangement of the parts oi the machine to which my invention is to be applied.

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

l. A paper cutter having in combination with a back gauge, power driven mechanism for intermittently advancing said back gauge in step by step Vmovement a predetermined amount, independently power driven rapid traversing mechanis'm for moving said back gauge, means for rendering either mechanism operative at any stage vof stock advance and means for inhibiting each of said means when the other is set for operation, both of said means having safety blocking devices to limit the movement of said back gauge at eX- treme limits of its movement.

2. A paper cutter having in combination with a back gauge, electrically driven means for intermittently advancing said back gauge in step by step movement predetermined series of distances, and independently electrically driven rapid traversing means for moving said back gauge, starting buttons for each of said electrically driven means, and movable means for covering one of said buttons and exposing the other.

3. In combination with a paper cutter having a gauge for advancing paper into cutting position, means comprising an operative connection for moving said gauge a series of similar predetermined distances, and a connectionV rendered operative alternatively with the rst mentioned connection for subsequently moving said gauge a different series of similar distances.

4. In combination with a paper cutter having a gauge for advancing paper into cutting position, means comprising an operative connection for moving said gauge a series of similar predetermined distances, and a connection rendered operative alternatively with the first mentioned connection for subsequently moving said gauge a different series ofy similar distances, and a rapid traverse provided with means for actuating same in forw rd and reverse movement.

5. In combination with a paper cutterv having a gauge for advancing paper into cutting position, means comprising anY operativey connection ior moving said gauge a series of similar predetermined distances, and a connection rendered operative alternatively with the first mentioned connection for subsequently moving said gauge a different series of similar distances, and a rapid traverse provided with means for actuating same in forward and reverse movement, and means for inhibiting said rapid traverse at extreme limits of movement of said gauge.

6. In combination with a paper cutter having a gauge for advancing paper into cutting position, means comprising an operative connection for moving said gauge a series of similar predetermined distances, and a connection rendered operative alternatively with the rst mentioned connection for subsequently moving said gauge a different series of similar distances, and a rapid traverse provided with means for actuating same in forward and reverse movement, and means blocking the actuation of said rapid traverse during intervals when said rst and second noted means are set for operation.

'7. In combination with a paper cutter having a gauge for advancing paper into cutting position,

means comprising an operative connection for moving said gauge a series of similar predetermined distances, and a connection rendered operative alternatively with the first mentioned connection forsubsequently moving said gauge a 1 different series of similar distances, and a rapid traverse provided with means for actuating same in forward and reverse movement, and means inhibiting the actuation of said second noted means during intervals when said rst noted' means is set for operation.

8. In a paper cutting machine, mechanism for advancing work to cutting position and means alternatively connectible to said mechanism for advancing the Work in more than one series of ico equal predetermined distances, and manual means for advancing work to said cutting position eiective at the end of an advance a predetermined distance, said alternatively connectible means being entirely disconnectible from said mechanism to permit said manual advance.

9. In a paper cutting machine, mechanism for advancing work to cutting position and means alternatively connectible to said mechanism for advancing the work in more than one series of equal predetermined distances, and a forward and reversing rapid traverse mechanism, and means whereby operation of the last mentioned means is inhibited when said advancing means is set for operation.

10. A paper cutter having in combination a back gauge, and, coaxially mounted, a rotary member operatable to traverse said gauge, an oscillating one-way driving device, and a continuously rotary element, said oscillating driving device engageable with said member to impart to it a step-by-step rotation, means for preventing engagement of said driving device with said member, means for engaging said continu- -ously rotary element with said member, to rotate said member therewith, and means to prevent rotation of said member by said continuously rotary element unless the driving device is disengaged.

11. A paper cutter having in combination a back gauge, a rotary member operatively connected to said gauge to traverse said gauge on rotation of said member, a continuously rotary element, an oscillating one-Way driving device engageable with said member to impart to it a step-by-step rotation, means for preventing engagement of said driving device with said member, means for engaging said continuously rotary element with said member, to rotate said member therewith, a motor to drive the continuously rotary element, means operative to permit a supply of energy to said motor, and means actuated to prevent operation of said control means incident to engagement of said driving device.

12. A paper cutter having in combination a back gauge, a rotary member operatively connected to said gauge to traverse said gauge on rotation of said member, a continuously rotary element, a plurality or" oscillating one-way driving devices engageable with said member to impart to it a step-by-step rotation, means for preventing engagement of any one or all of said driving devices with said member, means for engaging said continuously rotary element with said member to rotate said member therewith, alternatively to engagement of said driving devices with said member, and mechanisms for oscillating the respective driving devices, each with a different amplitude.

13. A paper cutter having in combination a back gauge, a rotary member operatively connected to said gauge to traverse said gauge on rotation of said member, a plurality of oscillating one-way driving devices engageable with said member to impart to it a step-by-step rotation, means for preventing engagement of any one or all of said devices with said member, and mechanism for oscillating the respective devices, each with a different amplitude.

14. A paper cutter having in combination a back gauge, a rotary member operatively connected with said gauge to traverse said gauge on rotation of said member, a plurality of oscillating one-way driving devices, a continuously rotary element between said driving devices, said rotary element and driving devices being coaxial with said rotary member and said driving devices being engageable with said member to impart to it a step-by-step rotation, means for preventing engagement of either one or both of said driving devices with said member, a plurality of cranks, each having a diierent eiective throw and operatively connected to the respective driving devices to oscillate said devices each with a dierent amplitude, and means for engaging said continuously rotary element with said member, to rotate said member therewith alternatively to engagement of said driving devices with said member.

15. A paper cutter having in combination a back gauge, a plurality of one-way driving devices operatable on said gauge to impart to it a step-by-step movement, means to render one of said driving devices inoperative upon said gauge, and mechanism operating each one of said driving devices with a different amplitude.

16. A paper cutter having in combination a back gauge, a plurality of one-way driving devices operatable on said gauge to impart to it a step-by-step movement, means to render either one or both of said devices inoperative upon said 115 gauge, mechanism operating each one of said driving devices with a different amplitude, a traversing device operatable on said gauge to impart to it a continuous movement, means to render said traversing device inoperative upon said i2@ gauge, and means precluding simultaneous operation of the driving devices and the traversing device upon said gauge.

17. A paper cutter having in combination a back gauge, mechanism operatable upon said gauge to impart a step-by-step movement thereto, mechanism operative upon said gauge to impart a continuous movement thereto, electric motors driving the respective mechanisms, means for each mechanism, operatable to connect or disconnect the mechanism to the gauge, and means whereby supply of current to the motor of either mechanism is prevented incident to operation of the means to connect the other mechanism to said gauge.

WILLIAM L. VALIQUETTE.

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