Sheet material stacking device and automatic exposure device for a printing plate

A sheet material stacking device for stacking, at a stacking section which is provided at a downstream side, sheet materials which are transported from an upstream side, comprising:

• a pair of nipping and feeding members which are disposed at a sheet material transport direction upstream side of the stacking section, which receive the sheet materials which are transported from the upstream side, and which forcibly feed the sheet material to said stacking section;
• a guiding device which is disposed at the sheet material transport direction upstream side of said nipping and feeding members, and which guides said sheet materials which are transported from the upstream side into a gap between said nipping and feeding members which face each other,
• wherein said guiding device has a pair of guide plates disposed so as to form a tapered shape having a width which gradually reduces toward said gap;
• wherein said nipping and feeding members are nipping and feeding rollers;
• and
• wherein said nipping and feeding rollers are a plurality of skewered rollers which are provided at a rotational shaft;
• and
• wrap-around prevention boards which are provided such that they follow along projections and indentations formed by each of the plurality of said skewered rollers which are provided at said rotational shaft and which prevent the sheet material which has passed through between said skewered rollers from engaging again with said skewered rollers.

An automatic exposure device for a printing plate which comprises:

• a conveying device which is able to mount and convey a magazine in which a plurality of printing plates, each of which has a photosensitive layer on top of a support, and a plurality of interleaf sheets for protecting plate surfaces of the printing plates are in a state of being stacked alternately in a sequential order;
• and an accommodating device which is able to accommodate said conveying device of said printing plates, and which ejects said printing plates after an image has been exposed;
• a take-out device which alternately takes said printing plates and said Interleaf sheets from the stacked state thereof one at a time from said magazine;
• and
• an interleaf sheet stacking device which stacks said interleaf sheets which are transported from said take-out device at an upstream side, at the interleaf sheet accommodating section which is provided at a downstream side, wherein said interleaf stacking device comprises:
• a pair of nipping and feeding members which are disposed at the interleaf sheet transport direction upstream side of said interleaf sheet accommodating section, which receive said interleaf sheets which are transported from said take-out device, and which forcibly feed said interleaf sheets to said interleaf sheet accommodating section;
• and
• a guiding device which is disposed at said interleaf sheet transport direction upstream side of said interleaf sheet accommodating section, and which guides said interleaf sheets which are transported from said take-out device into a gap between said nipping and feeding members,
• wherein said guiding device has a pair of guide plates disposed so as to form a tapered shape having a width which gradually reduces toward said gap;
• and
• wrap-around prevention boards which correspond to each of the pair of nipping and feeding members and prevent the interleaf sheets which have passed through the nipping and feeding members from engaging again with said nipping and feeding members.