Printing paper cutting device for an electrical copier

A copy paper cutting device for use in an electrophotographic copying apparatus which uses roll-type copy paper on which the image of the object to be reproduced is printed, said device comprising:

• transparent platform means for supporting the object to be copied;
• optical projecting means beneath said transparent platform means for projecting the image of the object to be copied on said transparent platform means to an exposure position;
• roller means positioned adjacent the copy paper fed from the roll of copy paper, on both sides of the copy paper along the path of the copy paper as it passes through the device, said roller means comprised of:
• a first pair of rotating rollers positioned on both sides of the copy paper as it is fed from said roll of copy paper,
• a second pair of rotating rollers adjacent and spaced from said first pair of rollers on both sides of said copy paper, said second pair of rollers rotating at a speed at least as fast as said first pair of rollers, whereby the copy paper is stretched between said first and second pairs of rollers;
• and
• a third pair of rotating rollers adjacent and spaced from said second pair of rollers on both sides of said copy paper, said third pair of rollers rotating at a speed slower than said second pair of rollers, whereby a predetermined amount of loop of copy paper is formed between said second and third pairs of rollers;
• cutting means located between said first and second pairs of rollers for cutting said copy paper;
• rotating means operatively connected to said roller means for rotating said roller means,
• first switch means operatively connected to said cutting means and to said first and second pairs of rollers for deactuating said first and second pairs of rollers and for actuating said cutting means;
• and
• control means adjacent said first switch means for contacting said first switch means and for controlling the size of copy paper cut from said copy paper roll, said control means comprised of:
• a scale member graduated with a contracted scale marked with a plurality of scale marks corresponding to sizes of paper to be cut from said roll of copy paper,
• a first mark on said graduated scale member, representing the length of one size of object to be copied, spaced from a second mark indicating the size of a different object to be copied by a distance corresponding to the product of the ratio of the feeding speed of said third pair of rollers to said second pair of rollers and the difference of the length of the objects indicated by said first mark and said second mark,
• movable means adjacent said scale member for movably sliding to the desired scale mark on said scale member corresponding to the size of the paper to be cut, and
• first actuating means attached to said movable means and movable therewith for contacting said first switch means.

A copy paper cutting device for use in an electrophotographic copying apparatus which uses roll-type copy paper on which the image of the object to be reproduced is printed, said device comprising:

• transparent platform means for supporting the object to be copied;
• optical projecting means beneath said transparent platform means for projecting the image of the object to be copied on said transparent platform means to an exposure position;
• roller means positioned adjacent the copy paper fed from the roll of copy paper, on both sides of the copy paper along the path of the copy paper as it passes through the device, said roller means comprised of:
• a first pair of rotating rollers positioned on both sides of the copy paper as it is fed from said roll of copy paper,
• a second pair of rotating rollers adjacent and spaced from said first pair of rollers on both sides of said copy paper, said second pair of rollers rotating at a speed at least as fast as said first pair of rollers, whereby the copy paper is stretched between said first and second pairs of rollers, and
• a third pair of rotating rollers adjacent and spaced from said second pair of rollers on both sides of said copy paper, said third pair of rollers rotating at a speed slower than said second pair of rollers, whereby a predetermined amount of loop of copy paper is formed between said second and third pairs of rollers;
• cutting means located between said first and second pairs of rollers for cutting said copy paper;
• rotating means operatively connected to said roller means for rotating said roller means;
• first switch means between said cutting means and said second pair of rollers for actuating said optical projecting means in response to said copy paper passing between said cutting means and said second pair of rollers;
• second switch means operatively connected to said cutting means and to said first and second pairs of rollers for deactuating said first and second pairs of rollers and for actuating said cutting means;
• and
• control means adjacent said second switch means for contacting said second switch means and for controlling the size of copy paper cut from said copy paper roll, said control means comprised of:
• a scale member graduated with a contracted scale marked with a plurality of scale marks corresponding to the sizes of paper to be cut from said roll of copy paper,
• movable means adjacent said scale member for movably sliding to the desired scale mark on said scale member corresponding to the size of the paper to be cut, and
• first actuating means attached to said movable means and movable therewith for contacting said second switch means.