US124774A - Improvement in paper-cutting machines - Google Patents

Description

2 Sheets--Sheet1.

GEORGE A. WALKER.

Paper Cutting Machine. No.124,774. Patented March19,18 72.

2 Sheets--Sheet 2.

GEORGE AQWALKER.

Paper Cutting Machine. N0. 124,774. Patented March19,1872. I

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GEORGE A. WALKER, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN PAPER-CUTTING MACHINES.

Specification forming part of Letters Patent No. 124,774, dated March 19, 1872.

a, in connection with the drawing which accompanies and forms part of this specification, is

a description of my invention sufficient to enable those skilled in the art to practice it.

My invention relates to certain details of construction of machines for cutting paper, the improvements having reference to the method of actuating the knife and to the method of adjusting the gauge-bar, against which rest the edges of the paper opposite to the edges to be trimmed.

The drawing represents a machine embodying the improvements.

A shows the machine in side elevation. B is a plan of it. C is a central vertical section. D is a bottom view of the table. E is a vertical section of the cutter bar, cutter, and clamp.

a denotes the frame; I) b, the upper ends of the uprights, in the vertical slots 0 of which the cutter-bar 01 moves laterally and vertically, said bar being suspended by links 6 from the head f, and having in one end an oblong vertical slot, 9, in which moves the actuatingcam h that drives the cutter-bar forward, and thereby imparts the cutting motion to the knife 6. This cam is fast upon a driving-shaft, It, on which is the crank or hand-wheel Z, the shaft turningin a stationary bearing, and. as the cam rotates and drives the cutter-bar forward the downward movement of the cutter-bar is controlled by the links 0 and a hold-back and lifter-roll, m, hung upon a pin, at, extending from the cam. The periphery of this roll runs against the edge of a track-plate, 0, extending from the slotted end of the knife-bar, and the rise and outward movement of the bar is'effected by the roll which runs on the edge of the plate, and thereby prevents wear and strain upon the face of the cam, and facilitates and eases the rise of the bar, the friction being overcome by the rotation of the roll. An eccentric may be substituted for the cam and roll, but, in some respects, the cam and roll are preferable. In either case the cutter-bar can move down. only so fast as permitted by the links, while the slot permits the free vertical. movement of the bar, and the cam or eccentric imparts the positive lateral cutting movement. The cutter is confined to the cutter-bar by screws p passing through slots q in the bar, and the head of the cutter-bar projects over the top of the knife or cutter, and has set-screws r passing through the overhanging portion.

By loosening the screws p the cuttingedge along its whole length may be brought down to the surface of the bed j when the bar is in its lowest position, the set-screws 0 being then turned down until they strike the top of the cutter. The screws p are then turned up, and the cutter is thereby fastened in position. As the cutting edge wears and is reduced by sharpening the set screws are turned down in accordance with the decreased width of the cutter, and thus the cutter is kept in correct position. v

On the back side of the cutter-bar is a clampbar, 8, by which the paper is pressed down to the table, and compacted and held firmly in position for the stroke of the cutter. To prevent buckling of the cutter, and to act as a gauge or guide against which it shall rest lat= erally, the front edge of the bar 8 is brought up to the cutting-plane. To keep this plane true I make the bar with a shoe, t, formed of wood, and confined to the bottom of the bar by screws a passing through slots 0. The edge of this bar is kept up to the face of the cutter, projecting for this purpose slightly beyond the face of the bar above it. As the edge of the shoe wears it is fed forward by loosening the screws to, the bar being screwed down so as to be below the cutting-edge of the knife, and the screws being then tightened the I knife descends and trims and trues off the edge of the shoe, which then forms a new bearing-surface and guage for the back of the knife.

w denotes the sliding gauge that rests against the rear edges of the pile of paper, its front face forming the surface parallel to which the knife is to cut. This gauge has atail-piece, w, fixed to a slide, y, travelingin a guide-groove, z, the screw-threaded shank a? of a feed-screw working in a nut-thread formed in a projection from the slide, to enable the bar to be fed up toward or from the cutter.

To keep the face of the bar in correct position it is made adjustable as follows A screw, b passes through ahole of corresponding size in thetail-piece 00 into the slide y. Another screw, 0 passes through a slot, LP, in the tailpiece, into the slide y. Near the end of the tail-piece is a slot or square hole, 0 through which a vertical projection, f passes from the slide, the projection being smaller than the slot or hole, andleaving play for the tail-piece. Set-screws 9 pass through the tail-piece and abut against the projection, and, by loosening the screw 0 the tail-piece, and consequently the bar, may be slightly turned, by screwing back one set-screw and starting forward the other, until the face of the bar is brought to accurate position. The screw 0 is then turned down, and the bar will be thereby secured in correct position.

The front and narrow part j of the table is made stationary with respect to the frame, but the rear and wide part 2' that receives the paper is formed as a leaf hinged to the part j, as

seen at O, and is supported in horizontal position by a prop, l hinged at top, as seen at W, and resting at bottom on the stretcher 12 By turning forward the feed-screw a until the slidey is fed from the screw and lifting the prop, the leaf may be dropped into a vertical position.

I claim- 1. In combination with the cam h working in the oblong slot 9 of the cutter-bar, I claim the loose roll m mounted on the face of said cam and eccentric thereto, and operating in conjunction with the straight-edge of the rolltrack 0, substantially as shown and described.

2. The edge-gauge w, made adjust-able angularly, or with respect to to the path of movement of the cutting-edge, by means of the two vertical screws 1) c and slot d and the two horizontal screws as described.

G. A. WALKER.

Witnesses:-

FRANCIS GOULD, S. B. KIDDER.

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