| 摘要 |
PURPOSE:To eliminate an impact sound and to smooth operation by displacing and returning an intermediate roller speedily to a driving roller by utilizing a cam which is arranged coaxially with the intermediate roller. CONSTITUTION:When a form is inserted into between the intermediate roller 2 and driving roller 1 from right, a gap which is as large as the thickness of the form is formed between an outer periphery and the roller 1, and then the cam 4 is released from friction against the roller 1 to rotate clockwise by being energized by a spring 5 and stops where the specific-diameter part of a cam part 4a contacts the roller 1. When the form is passed, the specific- diameter part of the cam part 4a is pressed against the roller 1 by the pressure of a pressure roller 3 and the cam 4 rotates counterclockwise against the spring 5 while receiving frictional force of rotation, and the cam part 4a is pressed against the roller 1 at its smaller-diameter parts gradually and the part which is equal in diameter to the roller 2 is pressed lastly. The roller 2, therefore, comes closer to the roller 1 and contacts and returns to the roller gently to the end without any shock. |
