| 摘要 |
PURPOSE:To prevent noise from being generated and enable to precisely position a platen, by spacing a detent gear and a tip part of a detent lever from each other by a solenoid while a platen is rotated, in a typewriter or the like. CONSTITUTION:When rotating the platen 1, an exciting signal is given to a solenoid 13 earlier by a predetermined period of time than an operating signal for a paper-feeding motor 5, whereby the detent lever 10 is rotated clockwise around a shaft 11 against a spring 12 by a pin 14, and the tip 10a of the lever 10 is spaced completely from the detent gear 9, so that the platen 1 is released from the detent. When the motor 5 is stopped after rotating the platen 1 by a predetermined angle, the solenoid 13 is de-energized, so that the lever 10 is again engaged to the detent. Accordingly, since no noise is generated and the detent mechanism is prevented from being abraded, the stopping position of the platen can be precisely set, and the platen can be positioned precisely and accurately.
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