| 摘要 |
<p>A grip shaft (2) is supported on a cylinder that makes a reciprocating rotational motion. The grip shaft (2) is provided with a grip (3) for holding a printing material. The grip (3) is further provided with a cam follower (6). A cam (21) is positioned along the path of motion of the cam follower, and the cam follower engages with an opening portion (22) of the cam when the grip is right before a printing material feeder portion, and opens the grip. Further, when the grip reaches the printing material feeder portion, the cam follower moves to a closing portion (23) of the cam, closing the grip to hold a printing material. After the grip has held a printing material, the cam follower disengages from the cam as the cylinder is rotated in the opposite direction. The opening portion and the closing portion composes a continuous cam surface.</p> |
