US2068504A - Paper cutting machine - Google Patents

Description

Jan 19, 1937. A M SCH 2,068,504

PAPER CUTTING MACHINE Filed June 15, 1932 3 Sheets-Sheet l Jan. 19, 1937. A. MISCH PAPER CUTTING MACHINE Fild June 15, 1932 s Sheets-Sheet 2 INVENTOR Jan. 19, 1937. sc 2,068,504

PAPER CUTTING MACHINE Filed June 15, 1932- 3 Sheets-Sheet 3 Patented. Jan. 19, 1937 PAPER CUTTING MACHINE Augustus Misch, Bronx, N. Y.

Application June 15, 1932, Serial No. 617,272

16 Claims.

This invention relates to improvements in paper cutting machines, and it is the principal object of my invention to provide a machine in which the ingenious arrangement of the power unit producing the pressure, while developing an enormous clamping power and allowing the knife to produce a shearing cut will save more than 59% of the power used heretofore in the operation of such machines as the clamping unit preserves and retains its power constantly in abeyanoe and requires a small percentage of the operating force only for its actual operation to perform the cutting, while the paper stack is securely clamped at all times under a steady and uniform pressure during the cutting operation as Well as during a part of the upward stroke of the knife, depending on the size of the 'paper pile.

Another object of my invention is the provision of a scale for translating and indicating by an ingenious construction the pressure exerted in tons.

It will be evident that I may use the machine of the guillotine type also for cutting leather, textiles, rubber and the like holding these materials under a steady'pressure during the cutting operation and the said upward stroke of the knife.

The known paper cutting machines of this n type use clamping devices which are operated by means of friction clutches, cams, springs and. levers and all use the entire force developed by the driving motor to produce the power necessary for the clamping operation. I do away with such auxiliary devices for the clamping arrangement by producing the clamping power by hand to any necessary amount required and my novel clamping unit will keep this pressure translated and indicated by a scale in tons uniform and steady without changing the same and without the necessity of using hardly any machine force to start the operation of the clamping device after each operation of the knife.

A further object of my invention is the provision of a flexible beam supporting the carriage.

A still further object of my invention is the provision of a novel and improved treadle construction including a balance beam or cradle to center the pressure in the middle of the clamping bar and the connection of connecting levers for the treadle elements to ensure a parallel position of the clamping bar to the table.

These and other objects and advantages of my invention will become more fully known as the description thereof proceeds, and will then be more specifically defined in the appended claims.

In the accompanying drawings forming a ma terial part of this disclosure:

Fig. 1 is a front elevation of a paper cutting machine constructed according to my invention.

Fig. 2 is a side elevation thereof.

Fig. 3 is an interior view illustrating the clamping device.

Fig. 4 is a top plan view thereof.

Fig. 5 is an end view, partly in section.

Fig. 6 is a top plan view of the back plate of the clamping device.

Fig. 7 is a front elevation thereof.

Fig. 8 is an end view thereof.

Fig. 9 is a top plan view of a sledge.

Fig. 10 is a side View of the sledge.

Fig. 11 is an end view thereof.

Fig. 12 is a top plan view of a carriage.

Fig. 13 is a front elevation thereof.

Fig. 14 is a top plan view of a clamp beam.

Fig. 15 is a front elevation thereof.

As illustrated the machine frame is constructed of the base I and the side frames 2 and 3 erected on said base between which the table 4 is held.

The knife bar is designated 5 and its knife 6 guided between the side frames.

The paper stack clamping arrangement comprises a clamp beam 1 also guided between the side frames and connected by levers and rods with the treadle 8 for the operation of the clamping device by foot.

The paper stack back gage It) is slidably arranged upon table t and is moved along the; same by means of the endless chain H guided over suitable sprocket Wheels one of which is operated by means of the hand wheel I2 for the purpose of adjusting the material for the cut. The gage I6 is connected by means of an upright It?' clamping the band W to indicate the size of the stack on the band guided over suitable wheels 13.

Above the clamp beam 1 and behind the knife bar 5 is arranged the complete mechanism for the clamping unit constructed according to my invention comprising an inclined screw Hi adapted to be operated by a hand Wheel M at its upper end; and a scale 15 later to be more fully described indicates the amount of pressure exerted by the clamping mechanism. Parts 6, F

1, 8, 14, 14 and 15 when assembled as illustrated in Figures 3, 4 and 5 form a unit, which I call a. pressure producing unit producing an internal and unexhaustible power which is transferred as clamping pressure on the paper stack holding the same under a constant weight during the cutting period, and which after the cutting operation has been finished is returned into the clamping housing as a. whole, unchanged, and ready for the next operation.

The knife bar is operated from a motor iii, the power of which is transmitted by gears i? and i3 operating the drive shaft is connected to the knife bar 5 by means of the rods iii and ill.

The clamping device or unit includes a back plate 22 to guide the combined clamping mechanism and to connect same with the knife bar 5 slidably connected to the sledge 23 guided in the guides 22 and Knife bar 5 and the sledge 23 form a clamping housing in which is guided the flexible beam 25* and the roller carriage 23 to produce pressure between the rim 25 and the guides and 33 on the knife bar. Back plate 21% serves the purpose of guiding the sledge and to hold the same in its correct position for the operation of the knife bar.

A sledge slides with its top 2-i,and its side groove 25 in the guides 22 and 23 of the plate, and has in front an extended rim 25 which during the operation of the clamping unit presses on the balance beam i of the clamp beam l.

Levers 28 and 2% connect the clamp beam and balance beam l with the shaft til to hold the clamp beam parallel to the table 4i, and member of the shaft til is connected by a rod with the foot treadle 3. The back plate 22 is guided for vertical reciprocation with its ends in the side frame bars 2 and 3.

The sledge 23 shown in Figures 3, 4i, and 5, is slidable horizontally or displaceable in the guides and 23, of the back plate and has slidably bolted thereto a carriage 23 carrying the rollers 22% and 21.

This carriage rests on top of a flexible beam The knife bar 5 carries the inclined or slanting guides 32 and 33 engaging the rollers 25 and ill. The degree of slant of guides 33, corresponds to the degree of slant of the roller guides 34 for the knife bar 5 and the guide 55 for the sledge Under the extended rim 25 (Fig. 5) is shown the clamp beam l with the balance beam i which serves the purpose of centering the pressure to the center of the beam i in accordance with the degree of slope of the rim 25 The scale iii for translating and indicating the pressure in tons (Fig. 3) is bolted with its extension 37 to the sledge 23 and the rack til of the scale mechanism is connected with the carriage 23 and a finger having segmental gear teeth in engagement with the rack is pivotally secured at its lower end while its other end carries a curved member in engagement with a similarly shaped member at the lower end of the hand, which is pivoted intermediate its ends to the scale housing.

For producing the clamping pressure one end of the angular lever 33 is attached to the sledge by means of a pin St while the other end of the lever carries an operating screw M equipped with a hand wheel i l.

This screw works with its end against the extension Ml of the sledge 22% and upon its operation by the hand wheel, the operating screw works on or against extension it of the sledge 23 and when the same is displaced thereby, the adjusting screw wedges the carriage 23 with its rollers 2:3, flbagainst guides 32, 33, so that the carriage will slide downwards and will comthe flexible beam 25 with a pressure equal act-28,504.

to about per one ton to be indicated on scale iii.

In this position the extended rim 2% engaged by the flexible beam 25 will press downward against the internal extended rim 4! of the knife bar 5 so that the pressure produced between the guides and 33 respectively and the rim will always remain available for further operations.

My novel and improved cutting machine operates as follows:

The hand lever 42 is pulled back with the rollers and then moved to the left for the purpose of operating friction clutch M for starting the machine, by coupling the same with the motor, which is preferably kept running idle during working.

The knife bar 5 will then move downwards and to the left guided by roller guide 34. During the oblique movement of the knife bar 5, the back plate 22 moves with the sledge 23 vertically, guided with their ends in the side frames 2 and 3, while at first the sledge simultaneously slides horizontally to the left in guides 22 and 23 on the back plate to meet the oblique movement of the knife bar.

The vertical movement of the back plate together with the horizontal movement of the sledge produces the exact path for the obliquely moving guide 3% of the knife bar however, these movements are dependent upon the height of the paper stack, and these movements are stopped by paper stack, the height of which varies in practice.

At the moment of arresting the paper stack (clampin down) the said motions of the back plate and of the sledge stop, the rim of the knife bar releases the rim of the sledge, and now, the pressure is transferred upon the paper stack and holds the same, while the knife bar continues to complete the oblique movement (stroke) by performing the out.

When, the knife bar is going upwards while the clamp is still holding the stack, the rim of the knife bar meets the rim of the sledge, releases the sta-ck by transferring the same clamping pressure back into the clamping housing, while the back plate with the sledge are sliding back into the starting position to stop at the upward point of the stroke. The knife bar the clamping unit are in an oblique position to the machine frame and will permit starting the cutting at the left side of paper pile in the machine first, after the paper pile on the table has been clamped down by the clamp beam. 1 parallel with the table 4 while the balance beam l is in position in accordance with the obliquely disposed rim 25 As soon as the full clamping pressure is transmitted to the paper pile, the rim M of the knife bar releases the rim 25 to transfer the pressure to the clamp beam l and beam and allows the unit to follow the cutting movement.

During the cutting operation the knife bar with the knife will gradually assume a parallel position to the table completing it at the bottom point of the stroke by means of the equivalizing lever 45 which is connected to the knife bar and the pull rod.

Hereafter the knife bar will again move upward, and the rim M will engage rim 25 and release the paper pile to rise with the clamping unit to the upper position and stop, ready another operation.

The stop is effected by the cam 46 which engages the roller 43 for turning the shaftfl to release the clutch.

It will be understood that I have described and shown the preferred form of my device only as one example of the many possible ways to practically construct the same, and that I may make such changes in the general arrangement of my paper cutting machine and in the construction of its minor details as come within the scope of theappended claims without departure from the spirit of my invention and the principles involved.

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

1. A cutting machine of the guillotine type for cutting paper, leather, textile fabrics, rubber and the like, comprising. a cutter carried by a knife bar, an automatic paper clamping device operated by a pressure producing unit, a means to impart to said knife bar a vertical and oblique movement, a back plate and a sledge, the oblique movement of the knife bar imparting to said sledge a combined vertical and horizontal movement causing it to slide along the back plate and imparting to the latter a vertical movement, and said pressure unit lying between a portion of said knife bar and a portion of said sledge which overlies said clamping device, and a scale operated by said pressure unit to indicate the pressure in tons during each operation of the cutting period.

2. A cutting machine as described comprising a frame including its side bars, a back plate guided'with its ends between the side bars of said frame in vertical direction, guides on said back plate and a sledge displaceable along said guides in horizontal direction, a knife bar carrying guides, a roller carriage, a flexible beam on top of which said carriage rests for connecting said guides on the knife bar and the sledge to form a combined unit for causing the progressive engagement of the sledge and flexible beam to correspond to the knife bars obliquemovement, and an angular lever attached to the sledge at one end having intermediate its ends means to actuate the roller carriage and connected to said clamping mechanism, and an operating screw attached at the other end of said lever, and hand operated means to operate said screw to produce a clamping pressure.

3. A cutting machine comprising a plurality of mechanical elements combined to form a unit constituting an automatically operating paper clamping device including a knife bar and a clamping bar, both guided in the machine frame, and oblique roller guides on said knife bar, a roller carriage, and a lever arrangement pressing said carriage against said roller guides and a flexible beam upon which the pressure developed by said roller guides is transferred by the intermediary of the roller carriage for flattening said beam, and means for indicating the pressure as a weight on a scale.

4. A cutting machine comprising a plurality of mechanical elements combined to form a unit for constituting an automatically operating power producing clamping mechanism, including a knife bar having an extended rim, a knife on said bar for cutting the paper, and a flexible beam subjected to the clamping pressure of said clamping mechanism, a sledge having a rim supported by the rim of said carriage, an angular lever attached to said sledge at one end, and connected to the clamping mechanism, and an operating screw attached at the other end of saidlever, a hand wheel to operate said screw to operate said unit to produce a clamping pressure, means for disengaging both rims during the cutting operation, a clamp beam engaged by said flexible beam for depressing a stack of material on its table, adapted to be depressed by the transfer of pressure upon the disengagement of said rims by the operation of the knife connected to said knife bar for performing the cut.

5. A paper cutting machine comprising a shearing cutter, a means for guiding the same, and a sledge combined with the bar of said outter acted upon by a pressure producing power unit, a clamping device, and means for operating the same, means for operating said power unit independently of the first means for operating said clamping device, means for visibly indicating the amount of pressure exerted by the clamping device, and a balance beam engaged by the bottom of the sledge centering on said clamping device for balancing the pressure at the end of a stroke of the power unit.

6. A paper cutting machine comprising a motor operated shearing knife, a knife bar and a sledgesupported bysaid knife bar, a means for guiding the knife bar, a pressure producing unit between the knife bar and sledge, manually operated means for regulating the pressure produced by said unit, a balance beam, a clamping device for the paper stack, connected by the sledge and pressure unit and balance beam with the knife bar, a gage controlled by said pressure unit to indicate the pressure exerted in tons, said pressure unit consisting of a flexible beam for 3 yieldingly bearing upon the sledge, a treadle operating the clamping mechanism, the balance beam balancing the pressure beam at the end of a stroke of the pressure unit.

'7. In a paper cutting machine of the class described, a clamping unit for clamping the paper stack during the cutting thereof, a back plate, a knife bar, guides formed with said plate, a sledge sliding in said guides, a carriage bolted movably to said sledge for oblique displacement, rollers carried by said carriage, guides for engaging said rollers carried by said knife bar, a flexible beam supporting said carriage, an extension on said sledge, a hand operated screw for engaging said extension to displace said carriage to compress said flexible beam in which a compression of a fraction of an inch to one ton is developed, and means to indicate this pressure on a scale, said knife bar having a rim normally supporting a rim of the sledge but releasing the same for transferring the full pressure of the unit to a clamp beam to allow the unit to follow the cutting movement of the knife.

8. In a paper cutting machine of the class described, a sledge, a scale, an extension thereon, bolted to said sledge, a rackon a carriage, said sledge to which said rack is connected, a flexible beam on which said carriage rests engaging the rim of said sledge, the variation in the flexible beam while compressed influencing said scale, a finger on said scale, having segmental gear teeth in mesh with said rack and pivotally secured at its lower end to the scale, a curved member at the upper end of said finger, a hand and a curved member at the lower end of said hand in engagement with said curved member of the finger.

9. In a paper cutting machine, a back plate, a clamping mechanism guided by said plate and comprising a sledge, means for slidably guiding said sledge, an extended rim at the front thereof, a clamping beam, and a balance beam for the same adapted to be engaged by said rim of said sledge during the operation of the clamping mechanism, a carriage bolted to the front of said sledge, rollers on said carriage, guides on the knife bar co-operating with said rollers, a flexible beam on which the carriage rests, and carried by the rim of the sledge, said balance beam being a means to center the pressure on the clamp beam.

10. A cutting machine as described comprising a sledge, a carriage slidably bolted thereto, and connected by a flexible pressure beam to a clamping device, a control device for said pressure beam, consisting of a scale plate having its face divided into fields and numbers for translating the power developed by said clamping device and for indicating pounds and tons, and fastened by screws to the sledge, a hand operated gearing means for controlling a rod and rack connected with the carriage, and actuating an indicator over said face.

11. A cutting machine as described consisting of a back plate guided with its endsin the side frame for vertical movement, and provided with internal guiding slots for a sledge with an extended rim for carrying a flexible beam and a roller carriage, an indicator combined with these elements, a knife bar guided with its ends in the side frame, having an extended rim for supporting the rim of the sledge, provided with an oblique slot as guide and with oblique guide plates to transmit by means. of the rollers of said roller carriage movement to the back plate and the sledge combined with the flexible beam, the roller carriage and the indicator.

12. A cutting machine as described in claim 11, having also as a power producing arrangement, a double arm lever bolted to the sledge provided with a hand wheel screw for forcing the roller carriage against oblique guide plates for transforming the exerted hand force to a pressure of tons, to store the power and to change same for any pressure required for the operation.

13. A cutting machine as described comprising a clamp arrangement, and a clamping housing and a knife bar, means to impart to said knife bar an oblique position, said clamping housing resting on the rim of the knife bar and in oblique position of the knife bar the housing also assuming an oblique position with a balance beam intermediate the clamping housing and said clamp bar to transmit the pressure as a weight of any degree produced by the elements of the clamping housing upon the balance beam and to center the pressure or weight on the clamp bar and to press the stack against the table during the cutting period.

14. A pressure adjusting device for the work clamp of a paper cutting machine including a sledge having a fulcrum bearing and a pressure point, a Wedging carriage s'lidably mounted upon the sledge and also having a pressure point, and a lever pivoted in the fulcrum bearing with one end carrying means bearing upon the pressure point of the carriage and the other end carrying adjusting means bearing upon the pressure point of the sledge.

15. A paper cutting machine of the character described comprising a cutter, means to obliquely displace the cutter during its downward movement, and a clamping housing enclosing a resilient pressure element, a paper clamping bar acted upon by said pressure element, and means carried by the cutter which throughout its oblique displacement constantly bears upon said pressure element at a point at unvarying vertical distance above the clamping bar.

16. A cutting machine comprising a work clamp, a plurality of mechanical elements combined to form a unit for constituting an automatically operating power applying clamping mechanism including a knife bar having an ex tended rim, a knife on said bar for cutting the paper, and a flexible beam subjected to the clamping pressure of said clamping mechanism, and means controlled by said power applying clamping mechanism to move said clamping mechanism downward in angular direction to said work clamp to make the contact of the clamping mechanism with the Work clamp cuniform and proportionally jerkless and quiet.

AUGUSTUS MISCH.

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