In zwei Richtungen wirksames Schrittschaltwerk

摘要

1,085,061. Oscillating motors. OHR-TRONICS Inc. Jan. 1. 1965 [July 14, 1964], No. 76/65. Heading H2A. [Also in Divisions F2 and G5] In a device for transporting and sensing perforated tape, a capstan shaft 2 is adapted to be driven in either direction of rotation by ratchet mecha nism comprising a ratchet whee. secured to shaft 2 and having two sets of teeth 21, 211 arranged to be engaged respectively by pawls 27, 271 attached to armatures 25, 251 associated with solenoids 23, 231. Each armature 25 251 carries a pawl depressor 28, 281 which is adapted to hold the non- operative pawl 271, 27 out of engagement with its ratchet teeth 211, 21, respectively. A spring 26 is attached to the upper end of each armature and a non-conducting strip 36 is engaged by the lower end of each armature, movement of the strip 36 serving to break switch contacts 35. On energization of solenoid 231, armature 251 pivots in an anticlockwise direction whereby pawl 271 is moved to engage the next adjacent tooth 211, and strip 36 is moved in the direction of arrow B to break contacts 35 and de-energize solenoid 231. Under the influence of spring 26, the armature 251 moves back to its original position, thereby causing output shaft 2 to move one step in the clockwise direction, and causing movement of strip 36 towards the left so that switch contacts 35 again touch each other for the initiation of a new cycle. Energization of solenoid 23 effects anticlockwise movement of output shaft 2.