| 摘要 |
1,146,808. Tape recorders. BELTEK K.K. 6 Dec., 1967 [10 Dec., 1966], No. 55524/67. Heading G5R. A tape recorder is set in appropriate operation by the insertion of either a four-track or an eight-track tape cassette, one type of cassette having an aperture for operating a pinch roller in the recorder and distinguishing from the other type of cassette. As shown, an eight-track cassette (which contains its own pinch roller) on insertion into a slot 10 depresses a lug 5 on a leaf-spring 4 so that a cam 3, which is allowed limited rotary play about a shaft 1 carrying a pinch roller assembly 2, remains below the level of the base-plate 6 (Fig. 4(b)) under the action of a spring (8, Fig. 3) wound on the shaft 1, and pinch roller 2 is not brought into action. The underside of a four-track cassette 7b, however, has an aperture 7ba to receive lug 5 and permit spring 4 to raise cam 3 into the path of the leading edge of the cassette 7b which rotates the cam 3 and subsequently the shaft 1 so that pinch roller 2 enters the cassette through the aperture 7ba. A toggle-action spring 1a helps to urge the pinch roller 2 towards the capstan 11, and to return the pinch roller to its original inoperative position when the cassette is withdrawn. |
