Stencil sheet retaining device

A stencil sheet retaining device for holding an end portion of a stencil sheet so that the stencil sheet, which has already been subjected to a stencil-making process, is wound on an outer circumferential surface of a rotary cylindrical drum rotating around an axis thereof, the stencil sheet retaining device comprising:

• a clamping plate and a first rotary shaft, said clamping plate pivotally disposed through said first rotary shaft arranged in parallel with the axis of the rotary cylindrical drum with respect to the outer circumferential surface of the rotary cylindrical drum, the clamping plate having an oscillating end portion adapted to be attracted by a magnet plate arranged at a predetermined position on an outer circumferential surface side of the rotary cylindrical drum so as to be adapted to hold the end portion of the stencil sheet between the clamping plate and the magnet plate;
• a flapper member and a second rotary shaft, said flapper member pivotally disposed through said second rotary shaft arranged in parallel with the first rotary shaft with respect to the outer circumferential surface of the rotary cylindrical drum, the flapper member has an oscillating end portion, wherein the end portion of the stencil sheet adapted to be held by the clamping plate can be located on an upper side on which the oscillating end portion of the flapper member is adapted to be attracted to the magnet plate;
• a first contact piece disposed through the first rotary shaft at an end portion of the clamping plate opposite to the oscillating end portion of the clamping plate;
• a second contact piece disposed through the second rotary shaft at an end portion of the flapper member opposite to the oscillating end portion of the flapper member;
• a cam member having cam grooves movably arranged at a position where the cam member can be contacted with and separated from the first and second contact pieces, the cam member coming into contact with and pressing the first and the second contact piece according to a rotary position of the rotary cylindrical drum, so that the clamping plate and the flapper member can be put into open states in which the clamping plate and the flapper member can be respectively separated from the magnet plate, and so that the open states, in which the clamping plate and the flapper member are respectively open, can be respectively set at a predetermined timed relation and an open angle;
• and
• a driving device which moves the cam member to positions at which the cam member is contacted with and separated from the first and second contact pieces.