| 摘要 |
1,014,407. Sensing records. NAVIGATION COMPUTER CORPORATION. Aug. 5, 1964 [Oct. 17, 1963], No. 31877/64. Heading G4M. A perforated-tape reader comprises a solenoid 5 which actuates a tape advance sprocket wheel 1 through a pawl 2 and a ratchet attached to the sprocket wheel 1, and a solenoid 15 which lowers sensing pins 6, the two solenoids being energized by a common input pulse. The arrangement is such that the sensing pins 6 are lowered before the inertia of the pawl and ratchet mechanism is overcome and pawl 2 engages the ratchet. The sensing pins 6 are attached to springs 7, the ends of which pass through slots in a plate 17, Fig. 1, attached to the armature 16 of solenoid 15. Springs 7 urge the pins 6 towards the tape when solenoid 15 is de-energized and the armature 16 is raised by spring 18, Fig. 3. At the end of the stroke of armature 4 in solenoid 5, a rubber buffer 22 is compressed and bounces the armature 4 back so as to rapidly break the hysteresis action of solenoid 5. The pawl hammer assembly 3 is guided by the plastic-surfaced walls of the reader casing and strikes a rubber bumper 24 at the end of the return stroke of armature 4.
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