| 摘要 |
In a cassette tape recording and/or reproducing apparatus having a motor-driven capstan (9) which, in the forward operating mode, is rotated to drive the tape (8) to wind the tape (8) onto a take-up reel; a device (20) for automatically changing the apparatus to its stop or other operating mode when the tape (8) is fully wound on the take-up reel, comprises a pinch roller (1) which presses the tape (8) against the capstan (9) and therefore is rotated when the tape (8) is running and which stops rotating when the tape (8) is fully wound, a mode-change lever (21) having an elongated hole (26) with converging sides receiving a cylindrical actuating portion (23) of the pinch roller (1) to permit angular displacement of the lever (21) about the axis of the pinch roller (1) and also longitudinal displacement in the direction along the elongated hole (23) of the lever (2), a spring (30) urging the lever (21) in one direction along the elongated hole (26) for frictionally engaging the converging sides with the actuating portion (23) so that the lever (21) is frictionally urged to turn with the pinch roller (1) so long as it is rotated, a device (11) for establishing the stop mode of the apparatus upon displacement of the lever (21) in the opposite direction along the elongated hole (26) and a mode-change drive assembly (37) driven from the capstan (9) for effecting a rotary or other repeated motion and being operative to displace the lever (21) in such opposite direction against the force of the spring (30) only when the pinch roller (1) stops rotating and thereby no longer frictionally urges the lever (21) to turn angularly about the pinch roller (1). |
