Paper cutting unit of automatic drawing machines

A paper cutting system for automatic drawing machines, comprising:

• an automatic drawing machine having means for making a drawing of any one of a predetermined number of desired sizes on a drawing paper and for writing discriminating signals relating to the desired lengthwise and widthwise size of the drawing on a section of the drawing paper in accordance with signals from a central control unit and having means for transferring the paper lengthwise;
• and a paper cutting unit having cutter means composed of a Y-axis cutter having rotary and fixed blades disposed in opposition to each other on opposite sides of said drawing paper and operative to cut said drawing paper continuously in the Y-axis direction which is at substantially right angles to the lengthwise direction in which said drawing paper is transferred by bringing an edge of said fixed blade into contact with that of said rotary blade, and a rotary disc type X-axis cutter having a circumferentiallygrooved rotary body disposed on one side of said drawing paper, and a slitter knife disposed in opposition to said rotary body and on the other side of said drawing paper and selectively movable at substantially right angles to said drawing paper into and out of said circumferential groove in said rotary body to thereby cut said drawing paper in the X-axis direction parallel to the drawing paper-feeding direction, detecting means for reading the discriminating signals written on said drawing paper and producing corresponding output signals, and control means for controlling said cutter means in accordance with the output signals from said detecting means to obtain a cut piece of drawing paper containing thereon the drawing of of the desired size as determined by the discriminating signals.