| 摘要 |
<p>PURPOSE:To simplify the mechanism of a pinch roller and to attain the reduction of cost of the pinch roller mechanism by preparing an elastic member which holds a pinch roller case at a center position and a change plate which forms a lock part to lock the single end part of the elastic part and can have free reciprocating motions. CONSTITUTION:When a head plate 16 is kept at its retreat position, an elastic member 35 holds a pinch roller case 33 at a center position. Then the plate 16 moves forward, a change plate 32 moves and a lock part 32a of the plate 32 locks the single end part of the member 35. At the same time, the other end part of the member 35 presses the single end part of the case 33. Thus a pinch roller set at the edge part of the case 33 is pressed. While the moving direction of the plate 32 is changed when the plate 16 moves forward again at a channel changing action. Then the plate 32 moves in the opposite direction and the pressed pinch roller is also switched. In such a constitution, the number of component members can be decreased and the mechanism is simplified together with reduction of the cost for the pinch roller.</p> |
