| 摘要 |
<p>PURPOSE:To smoothly, stably and securely operate stoppers with simple constitution by providing opening/closing stoppers at the opening parts of a holder, a stopper driving means and a cam device. CONSTITUTION:A pair of stoppers 30 are provided back to back between the opening parts 16a and 17a and between 16b and 17b. The driving means 40 integrally drives a pair of the stoppers between the side of the opening parts 16a and 17a and between 16b and 17b. A spring 41 is provided for operation boards 32 and they are mutually approximated, whereby stoppers 33 are opened and held. Tapezoid cam surfaces 42 are provided for the intermediate position of the operation boards 32 and a driving shaft 34 and a roller 44 are installed. Since the roller 44 is usually released from the cam surfaces 42, a restoration spring 45 operates and the shaft 43 is displaced in an axial direction in a solenoid 46. Then, the roller 44 is rotated along the cam surfaces 42 and the stoppers 33 are displayed in a closed position. Thus, the structure of the stopper driving device is simplified with such constitution and the stoppers is stably and securely operated by light driving force.</p> |
