Paper cutting machine

Claim 2

For use in trimming copy reproduced on a paper, said copy consisting of printed material arranged in elongated columns, the combination comprising: a frame having spaced side support means; a forward paper support table mounted between said side support means; paper driving means mounted aft of said forward table; a paper cutting block between said forward table and said paper driving means; first and second knives, each having a sharpened straight cutting edge terminating at a point, said straight edges being biased against said cutting block at a slight angle thereto, the straight cutting edges of said knives being parallel to the direction of travel of said film; adjusting means for independently adjusting the lateral positions of each of said knives to align said knives with the edges of said columns; and said paper driving means comprising a drive roller, a forward idler roller and a rear idler roller, all of said rollers being supported between said side supporting means with their axes parallel, said idler rollers resting on said drive roller, the plane of said cutting block being substantially tangent to all of said rollers, whereby said paper is wrapped around said idler rollers and at least 180° of said drive roller.

Claim 3

The invention as defined in claim 1, and elevating means for raising both of said knives from said block.

Claim 4

The invention as defined in claim 1 wherein said knives are releasably secured within knife holders, said knife holders being pivotally mounted above said paper-cutting block.

Claim 5

The invention as defined in claim 3, and a cam comprising: a cylindrical shaft mounted between said walls adjacent said knife holders, said shaft being rotatably mounted on an axis eccentric to the axis of said cylinder; and a cam follower connected between each of said knife holders and said cam for positively moving said knives into and out of engagement of said cutting block when said cam is rotated.

Claim 6

For use in trimming copy reproduced on a paper, said copy consisting of printed material arranged in elongated columns, the combination comprising: a frame having spaced side support means; a forward paper support table mounted between said side support means; paper driving means mounted aft of said forward table; a paper cutting block between said forward table and said paper driving means; first and second knives, each having a sharpened straight cutting edge terminating at a point, said straight edges being biased against said cutting block at a slight angle thereto, the straight cutting edges of said knives being parallel to the direction of travel of said film, said knives being releasably secured within knife holders, said knife holders being pivotally mounted above said paper-cutting block; adjusting means for independently adjusting the lateral positions of each of said knives to align said knives with the edges of said columns; a cam comprising a cylindrical shaft mounted between said walls adjacent said knife holders, said shaft being rotatably mounted on an axis eccentric to the axis of said cylinder; and a cam follower connected between each of said knife holders and said cam for positively moving said knives into and out of engagement of said cutting block when said cam is rotated, each of said cam follower comprising a forked spring secured to a knife holder, said spring having two tines, one contacting the upper surface of said cam, the other contacting the lower surface of said cam.

Claim 7

For use in trimming copy reproduced on a paper, said copy consisting of printed material arranged in elongated columns, the combination comprising: a frame having spaced side support means; a forward paper support table mounted between said side support means; paper driving means mounted aft of said forward table; a paper cutting block between said forward table and said paper driving means; first and second knives, each having a sharpened straight cutting edge terminating at a point, said straight edges being biased against said cutting block at a slight angle thereto, the straight cutting edges of said knives being parallel to the direction of travel of said film, said knives being releasably secured within knife holders, said knife holders being pivotally mounted above said paper-cutting block; adjusting means for independently adjusting the lateral positions of each of said knives to align said knives with the edges of said columns; a cam comprising a cylindrical shaft mounted between said walls adjacent said knife holders, said shaft being rotatably mounted on an axis eccentric to the axis of said cylinder; and a cam follower connected between each of said knife holders and said cam for positively moving said knives into and out of engagement of said cutting block when said cam is rotated, each of said cam follower comprising a forked spring secured to a knife holder, said spring having two tines, one contacting the upper surface of said cam, the other contacting the lower surface of said cam.

Claim 8

The invention as defined in claim 5 wherein said tines are leaf springs.

Claim 9

The invention as defined in claim 1 wherein said adjusting means comprises: a threaded shaft rotatably mounted between said side walls; and a knife holder for each of said knives, each of said holders having a bore with internal threads, said holders being threaded onto said threaded shaft.

Claim 10

The invention as defined in claim 1 wherein said adjusting means comprises: a threaded shaft rotatably mounted between said side walls; a first and a second knife holder for said first and second knives, respectively, each of said holders having a cylindrical bore; and an internally threaded sleeve in each bore, said sleeves being threaded onto said threaded shaft.

Claim 11

The invention as defined in claim 8 wherein said sleeve for said first knife holder includes an integral enlarged disc, the friction between said sleeve and said knife holder being less than the friction between the threads of said sleeve and said threaded shaft, whereby said sleeve rotates with said shaft, and does not advance axially, except when said disc is held as said shaft is rotated.

Claim 12

The invention as defined in claim 9, wherein said sleeve for said second knife holder is slotted, a locking screw extending through said knife holder into contact with said sleeve for adjusting the friction between said holder, said sleeve and said threaded shaft.

Claim 13

The invention as defined in claim 1 and a pair of tracks on said table, said tracks providing a guide for the paper to be trimmed.

Claim 14

The invention as defined in claim 11, and a transparent plate freely supported on said table between said guides, said paper running on said table under said plate.

Claim 15

The invention as defined in claim 12, and a set of holes in said plate; a complementary set of holes in said table; and a peg extending through each hole in said plate and its complement in said table, said holes being aligned in the direction of travel of paper to be trimmed, said pegs providing a guide for one edge of said paper.

Claim 16

The invention as defined in claim 13 wherein there is a plurality of sets of holes and their complements arranged in spaced rows, said pegs being placed in a selected row.

Claim 17

The invention as defined in claim 1 and a drive motor, coupled to said drive roller, said motor being mounted on said side wall, said motor and said roller being coaxial.

Claim 18

The invention as defined in claim 6 wherein said adjusting means comprises: a threaded shaft rotatably mounted between said side walls; a knife holder for each of said knives, each of said holders having a bore with internal threads, said holders being threaded onto said threaded shaft.

Claim 19

The invention as defined in claim 6 wherein said adjusting means comprises: a threaded shaft rotatably mounted between said side walls; a first and a second knife holder for said first and second knives, respectively, each of said holders having a cylindrical bore; and an internally threaded sleeve in each bore, said sleeves being threaded onto said threaded shaft.

Claim 20

The invention as defined in claim 17 wherein said sleeve for said first knife holder includes an integral enlarged disc, the friction between said sleeve and said knife holder being less than the friction between the threads of said sleeve and said threaded shaft, whereby said sleeve rotates with said shaft and does not advance axially except when said disc is held as said shaft is rotated.

Claim 21

The invention as defined in claim 18 wherein said sleeve for said second knife holder is slotted, a locking screw extending through said knife holder into contact with said sleeve for adjusting the friction between said holder, said sleeve and said threaded shaft.

Claim 22

The invention as defined in claim 19 and a pair of tracks on said table, said tracks providing a guide for the paper to be trimmed.

Claim 23

The invention as defined in claim 20, and a transparent plate freely supported on said table between said guides, said paper running on said table under said plate.

Claim 24

The invention as defined in claim 21, and a set of holes in said plate; a complementary set of holes in said table; and a peg extending through each hole in said plate and its complement in said table, said holes being aligned in the direction of travel of paper to be trimmed, said pegs providing a guide for one edge of said paper.

Claim 25

The invention as defined in claim 22 wherein there is a plurality of sets of holes and their complements arranged in spaced rows, said pegs being placed in a selected row.

Claim 26

The invention as defined in claim 23 wherein: said paper driving means comprises a drive roller; and means for wrapping said paper around at least 180° of said drive roller.

Claim 27

The invention as defined in claim 24 and a forward idler roller and a rear idler roller, all of said rollers being supported between said side walls with their axis parallel, said idler rollers resting on said drive roller, the plane of said cutting block being substantially tangent of all of said rollers.

Claim 28

The invention as defined in claim 25 and a drive motor, coupled to said drive roller, said motor being mounted on said side wall, said motor and said roller being coaxial.

Claim 29

The invention as defined in claim 1 wherein said forward paper supporting table is an ascending ramp.

Claim 30

The invention as defined in claim 27, and a rear paper supporting table aft of said paper driving means, said rear paper supporting table being a descending ramp.