US2310838A

US2310838A - Paper cutter

Info

Publication number: US2310838A
Application number: US423961A
Authority: US
Inventors: David T Helprin
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-12-22
Filing date: 1941-12-22
Publication date: 1943-02-09
Anticipated expiration: 1960-02-09

Description

Feb. 9, 1943. D T, HELPRW 2,310,839

PAPER CUTTER Filed Dec. 22, 1941 2 sheets-sheet 2v lNvENToR wl'rN asses i lign/icl "T Helix/'in Y Y l BY l ATTORYEVTV Patented Feb. 9, 1943 NUNITED STATES PATENT OFFICE PAPER CUTTER David T. Helprn, New York, N. Y. Application December 22, 1941, Serial No. 423,961 7 claims. (C1. 164-73) This invention relates to cutting machinery, and more particularly to machinery designed to cut paper. In many operations involving the cutting and trimming of paper in the printing industry and in office work, it is desirable and essential that a plurality of sheets be cut accurately to a specific size. This is diiiicult with present equipment since most paper cutters are supplied with a knife having a shearing action which tends to cut unevenly when a substantial number of sheets are cut at one time.

The purpose of this invention is toV provide a three-way cutter which will not only cut a large number of sheets accurately and cleanly but which may also be used as a rule, a measuring unit, and an accurate punch.

A further object is to provide a cutting machine in which the accuracy of the machine may be controlled to a Very small fraction of an inch, and in which the cutting element must travel in the desired path.

A further object is to provide a device of the character described in which an inexpensive, replaceable cutting element, such as a razor blade, may be used.

With these and other objects in view, reference is had to the accompanying drawings, in which- Fig. 1 is a plan view of a machine embodying my invention, partly cut away;

Fig. 2 is a cross-sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a cross-sectional view taken on the line 3-3 of Fig. l;

Fig. 4 is a cross-sectional View taken on the line 4-4 of Fig. 3;'

Fig. 5 is a cross-sectional view taken on the line 5--5 of Fig. 1;

Fig. 6 is a view of la modified form ci cutting element.

I provide a base I9 having a top II. rhe top II is provided with a channel I2 running longitudinally of its length in a straight line. Mounted at one end of the top II are two pins I4 and I5 adapted to receive and position through openings therein a hinge member I5. Hingedly connected to the hinge member I6 is lan arm I1. The arm I1 is rectangular in shape and is made up of two bars, one bar slightly wider than the other. The wider bar has an edge I8 which may be used as a rule; the narrow bar has a ruling edge |9. The inner edge of both bars is beveled to prevent the blade from cutting into the bars.

At the opposite end of the top I are two angle bars 2|] and 2| firmly aiilxed to the top by means of screws 22. The angle bars and 2| Contact between the arm I1 and the carri-age.

are spaced to form an opening 23 so that the arm I1 may be positioned between them and rmly held to prevent any sliding movement. Mounted at either end of the arm I1 are the

posts

25 and 23 and positioned through said posts is the rod 21. The rod 21 passes through the opening 28 in the post 26 and the corresponding opening 29 in the post 25 and is firmly positioned by means of a thumb screw 30.

Mounted for sliding movement on the rod 21 is a blade-carrying carriage 3|. This carriage is provided with a plurality of rollers 32 which position the carriage on the rod 21 and prevent it from rocking. The bottom of the carriage 33 terminates above the arm I1 so that there is no A handle 34 is provided for convenient operation of the carriage.

At the lower portion of the carriage there is A an angle plate 35 fastened to the carriage by a thumb screw 36 and positioned by the pins 31. The angle plate V35 is adapted to hold a razor blade 38 so that its cutting edge 39 will extend through the slot '40 in the arm I1. Since the slot 4|] is positioned immediately over the slot I2, the blade vwill extend through the arm into the slot I2.

It will be readily understood that paper, such as indicated by the dotted lines 4|, will be inserted under the'arm I1 and the carriage 3| slid to the other end of the rod, thus cutting the paper along the slot 4I) as desired. Since from time to time a largenumber of sheets will be placed in the cutter at one time, thumb screws 42 in the hinge members I6 and 43 at the end of the arm are provided to raise or lower the position of the arm. A latch 44 is provided to hold the arm in the down position, and it will be understood that by the use of the

thumb screws

42 and 43 the arm I1 may be raised so that the paper to be cut may be slid under the arm I1 without raising the arm for each operation. The carriage 3| is so mounted on the rod 21 that it will readily slide thereon. The pick-up of the end of the arm |1 suiiiciently to remove cut paper will be enough to cause the carriage 3| to return to the post 28, However, a reel 50 having a coil spring 5| with a thong 52 Wound thereon may be provided to automatically return the carriage las soon as it is released. The end of the thong 52 is engaged to the pin 53 and as the carriage is moved toward the operator the spring is Wound. Immediately upon releasing the handle the spring and thong will return the carriage toward the post 28.

Scales 56 and 5'| are provided so that the operator may readily measure the paper being cut. A movable stop 53 held on the angle bar 2| by means of the set screw 59 may also be used and a punch 60 may be mounted in an opening in the angle bar 2| to punch the paper after it has been cut. The punch 60 is held in position against the bracket 62 by a single screw 6| and is recessed into the top as shown in Fig. 5. The bracket 62 is fastened to the angle bar 2|. Since several sizes of holes may be desirable, the punch is readily replaceable by a larger or smaller one by the simple operation of removing the screw 6|.

A holder for old blades is provided at 65, this holder consisting of two

pins

66 and 61 to position the blades, a covering plate 68, and a screw 69 to hold the plate in position. It will be readily seen that when ya blade is dulled or chipped, the angle plate 35 may be removed by taking oi the screw 36 and the blade reversed on the pins 31. In order that the operator may know Whether a blade has been used, a groove 10 in the end of the arm is provided to break 01T the end of the blade as indicated at 12.

While for all practical purposes a carriage carrying a single blade is suicient, certain types of work require cutting on both movements of the carriage. Where this type of work is required, a carriage l5 (as shown in Fig. 6) is useful. It will be appreciated that this carriage carries two blades 76 and 'I7 oppositely positioned so that the cutter may work regardless of which direction the carriage is moved.

It will also be appreciated that while I have shown the handle member 34 fastened by screws to the carriage, the entire assembly may be welded in one piece or made in any other convenient form.

I claim:

1. A paper cutting machine including a base, a channel in said base running longitudinally thereof, a hinge member at one end of said base astride said channel, an arm on said hinge member, a slot in said arm, posts adjacent each end of said arm, a rod mounted in said posts, a carriage slidably mounted on said rod, a cutting member on said carriage extending through said slot in said arm into said channel, and resilient means for yieldingly maintaining said carriage at one end of said rod.

2. A paper cutting machine comprising a base, an arm pivotally mounted at one end of said base, angle bars at the opposite end of said base adapted to engage the sides of said arm, a slot in said arm extending longitudinally thereof, a rod positioned above said arm, a carriage mounted for sliding movement on said rod said carriage being provided with spaced rollers engaging said rod, and a blade positioned on said carriage extending through said slot.

3. A paper cutting machine including a base, an arm hingedly connected at one end of said base, angle bars positioned adjacent the other end of said base, said angle bars being spaced to accommodate said arm, and a stop member mounted on one of said angle bars adapted to slide thereon and to be fixed at any desired position thereon.

4. A cutting machine comprising a base, a channel in said base, an arm pivoted at one end thereof astride said channel, angle bars on said base adjacent the opposite end thereof, said angle bars being spaced to accommodate said arm and to position said arm whereby each longitudinal edge of said arm and said angle bars will at all times form a right angle, a rod mounted on and above said arm, and a carriage carrying a cutting member slidably mounted on said rod.

5. A paper cutting machine comprising a base, a channel in said base, an arm pivoted at one end to said base, a carriage positioned above said arm for sliding movement, a cutting member in said carriage, and means for raising and lowering the position of said arm with relation to said base to vary the distance between said arm and said base when said machine is in operating position.

6. A device of the character described including a base, a channel in said base, an arm pivotally mounted at one end of said base, a pair of angle bars at the other end of said base mounted at right angles to said arm and at each side thereof, a scale parallel to said angle bars, an adjustable stop monuted on said angle bars, and a punch removably mounted on said angle bars.

7. A paper cutting machine comprising a base, a channel in said base, an arm mounted above said base, a slot in said arm, means for positioning said arm with relation to said channel, a rod mounted on and above said arm, a carriage slidably mounted on said rod, a cutting member carried by said carriage extending through said slot in said channel, a thong engaging said carriage, and spring means for exerting pressure on said thong to yieldingly maintain said carriage at one end of said rod.

DAVID T. HELPRIN.