| 摘要 |
In a record player the control device for the pick-up arm (4) comprises a command disc (12; 60) which is rotatable by a motor and to which is connected a reciprocable drive element (16; 62). A guide element (48; 78) is pivotally connected to the drive element, and is engageable with a coupling element (53; 63b) on a pick-up arm base (43; 63) to move the pick-up arm (4) towards the turntable (2). The control device further comprises a pivotal selection member (29; 66) having first (31; 71) and second (32; 72) positioning surfaces which are selectively cooperable with an abutment (57; 64) on the base (43; 63) of the pick-up arm (4) in order to position the pick-up arm (4) selectively in a first or second position respectively above the turntable (2). The guide element (48; 78) is pivotable between two stable positions, namely an inoperative first position which it occupies during the forward movement of the drive element (16; 62) and an operative second position which it occupies during at least a part of the return movement of the drive element, in which second position the guide element is engageable with the coupling element (53; 63b) to guide the pick-up arm (4). At the end of the forward movement of the drive element (16; 62) the guide element (48; 78) abuts a stop (56; 81) to be pivoted thereby to the second position. During the return movement of the drive element (16; 62), after abutment of the abutment (57; 64) on the pick-up arm base with one or the other of the positioning surfaces (31, 32; 71, 72) the guide element (48, 78) is pivoted out of the second position and is thus disengaged from the coupling element (53, 63b), after which the selection member (29; 66) is pivoted out of the path of the abutment (57; 64) on the pick-up arm base (43; 63) by the command disc (12; 60). |
