US1847803A - Paper trimming device - Google Patents

Description

March 1, 1932. J, B ALLEN 1,847,803

PAPER TRIMMING DEVICE Filed Jan. 24, 1929 Patented Mar. 1, 1Q32 JOSEPH BENJAMIN ALLEN, or DAR-LINGHURST, SYDNEY,

. a AUSTRALIA NEW SOUT WALES,

PAPER TRIMMING DEVICE A ncaummed January 24, 1929. Serial No, 334,831.

- This invention relates to apparatus fortrimming and cutting the edges of paper, but more especially ofwallpaper during the preparation for hanging it. Theusual type "of machine for this purpose consists of a cutting disc which is suitably held and controlled in a frame which is adapted to slide along a track attached to a straight edge. The straight edge, which is generally composed of wood, is sometimes marked for the purpose of providing dimensions. A strip of Zinc or thelike is usually placed beneath the straight edge so that the cutting disc may rest upon it. There are several disadvantages in the present type o-f'machine, some of which are; the liability of the straight edge to get out of truth at the cutting edge; the liability of the spring inthecutting device to break and the difiiculty of replacing springs in the cutting device and the unfavourable lubricationand cleaning of the cutting disc; the liability of the bladeduring the cutting process to come away from the straight edge; the possibility of the stay roller fitting becoming loose and of the cutting device slipping down onthe track when the straight edge isheld in the vertical'position. f v

It is the object of the invention to overcome these and other disadvantages and to provide an improved set of apparatus-for the "cutting and trimming of wallpaperand the like, which will be durable and simple and which may be easily manufactured and operated. 7 Some of the features of the invention are the arrangement and construction of the straight edge-of a one piece metal castingsuificiently flexible so that it will give to conform to a board which may not be quite level and which will always maintain a true cutting edge; the simplified construction of the cutting device comprising the abolition of the usual stay roller and-the arrangement "of the parts so that they may be rapidly and easily taken for cleaning and replacement and the mounting of the blade cutting disc such a manner that it is always slightly inclined and pressing against the cutting edge of the straight edge and other general improvements, all of which will be apparent from the following description of the drawing's which illustrate the apparatus for cutting and trimming wallpaper and the like. In the drawings, V

Figure l is-a-general perspective view of u the cutting device showing its relation to the straight edge,

Figure 2 is a side elevation of thecutting device,

Figure 3'is a sectional end elevation of the so cutting deviceon the line 1313 of Figure 2, Figures 4, 5 and 6 are perspective views of various forms of gauge bars and blocks. a The straight edge 20 is preferably formed of acasting of aluminium or similar matec5 rial. The cutting edge 22 is vertical and preferably square on both corners. The cutting device runs on a track formed on the upper edge of the cutting edge 22 and its actual shape is governed by the requirements of the cutting device. The track is formed by meansof a detachable strip 26 of brass or other suitable material, so that it may be renewed when necessary, screwed or otherwise aflixed to the straight edge.

The cutting device consists of a frame or body 35 to which is rigidly secured the guide bar 36 and to which the frame 37 is pivotally attached by means of the pin 38. The frame 37 is provided with a hand grip 39and a ho'rl- 30 zonta ly inclined boss 40 which carries in suitable adjustable bearings the cutting disc 41. The frame 37 is normally" raised about the pivot point by means of the spring 42 which is attached to the pin 43 and engages a projection on the cutter frame. The spring 42 extends rearwar'dly to the stationary pin 44, which latter passes through the slot 45 and frame 37 to act as a guide. The spring 42 has aturn 46 formed in it to give it extra end bears against the upper portion of the cutter to hold the lower part of the cutter in yielding relation with respect to the straight V edge. The opposite-or forward end of the spring is extended forwardly and at an angle to engage the track prior to being passed through theslot 48 and the guide bar. This arrangement serves as a brake to prevent accidental movement of the cutter since when pressure is applied to the handle 39 to displace the'cutterthe pressure of the forward portion of the spring on the track will be considerably reduced so as not to interfere with the movement of the device.

Lugs 49 entering the slot 50 and the lug 51 formed on the extension 52 entering the slot 53 hold and guide the cutting device along the track 26-. A pad 54 of leather or the like is retained within the recess 55 in the frame 35 so that when impregnated with lubricant it may lubricate the track26. Another lu- .bricating pad 56 isfastened to the frame 37 between it and the cutting disc so that it may clean, sharpen and lubricate the disc, the revolving beveled edge of the disc engaging the pad.. This pad is preferably circular as shown in Figure 2 and is attached in any convenient manner, as, for example, a screw entering into a recess in the frame 37.

In operation the frame 37 is pressed downwards by means of the hand grip. 39 and the cutting disc 41 brought into contact with the material and at the same time the spring extension passing through the slot 48 is raised from the track, thus releasing it from its braking action. When the hand grip is re leased the spring extension is pressed against the track and its pressure keeps the device from moving unnecessarily. So that the cutting edge of the'disc 41 may always be as close as possible to the face 22 of the straight edge it is given inclination as illustrated in Figure 3. Then the device has been in use for any length of time there is a possibility of the holesinwhich the screw 38 is mounted of becoming enlarged or of the screw thereof loosening which would have a tendency to allow the frame 37 to wahble. To avoid excessive movement of the cutter a distance block 62 is mounted on the frame and extends toward the cutter and is normally spaced slightly therefrom, the purpose being to prevent the cutter from moving into a vertical position. Any tendency of the frame to oscillate will be prevented by the lugs gripping the track on both sides. The blade is adjusted in position by means of the adjusting screw at the outer end of the arbor.

As shown in Figs. 4, 5 .and 6 the gauge bar and the block may be formed of one piece as shown in Fig. 5 or in separate pieces as shown in Figs. 4 and 6. The parts are substantially the same in outline of these two modified forms and corresponding but primed numerals are used.

It will be clear from the drawings that the cutting device may be quickly and easily dismantled by extracting the pivoted screw 38 and the guide screw 44, thus detaching the frame 37 from the guide frame 35, the spring extension being passed through the slot 48. Should the spring 42 require renewal it may be quickly removed by undoing the screw 43. Rapid cleaning of the device is thus facilitated and in addition the pads 54 and 56 keep the machine in good order. The forward end 57 of the frame 37 also acts as a guide.

The features of the device will now be more obvious from the foregoing description and they may be summarized as follows: the holding of the lower edge of the cutting blade in an inclined position against the lower edge of the side of the straight edge, thusavoiding the necessity for pressing down the hand grip in such a manner as to ensure this feature of making it certain thatwhen more than one cut is'to be made the device may be pushed backwards or forwards without the blade departing from the original cut;v the fore and aft construction of the spring '42 and its extension acting onthe track to pre- I vent the cutting device slipping when the straight edge is held in a vertical position.

"Another feature is that the spring 42 is so fashioned as to press against the cutting blade and keep it against the frame 37. v

The three particular advantages herein mentioned are accomplished by the particular shape of the spring 42. In this connection attention is particularly directed to the fact that this spring is coiled upon itself about the pivot 43 so that the respective end portions act in opposition to each other. The normal tendency ofthe spring is for the fore end to bear downwardly and the portion immediately on the other side of the pivot 43 to move upwardly with a view tokeeping the frame 37- in a raised position by engaging the projections 60. When pressure is applied to the handle portion 37 to depress the cutter owing to the reverse bending of the spring about the pin 43 the braking pressure at the extremeforward end of the spring is released. The bend 46 is slightly transversely arranged to the bend about the pin 43 so that the spring'bears against the inner face of the guide bar and the upper outer face of the cutter as shown in Fig. 3 with a View toward keeping the lower edge of the cutter against the straight edge 22.

I claim:

In paper trimming and cutting apparatus, a guide frame provided with atrack, a guide bar slidable on the track and provided with inturned lugs for coacting with the track and having a slot in its forwardend, a cutter and engaging the guide screw, and the forward end of the spring being bent angularly and passed through the slot in said guide bar, substantially as and for the purposes set forth.

In testimony whereof I have aflixed my signature.

JOSEPH BENJAMIN ALLEN.

Mr Ms 1...

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