| 摘要 |
<p>A device (3) for magnetically recording and/or reading signals in signal tracks on a magnetic tape comprises a drive shaft (11) which is rotatable about an axis of rotation (9; 109), a first means (13; 113) which is carried by the drive shaft (11) and which supports at least one magnetic head (15; 115) which is rotatable with the first means about an axis of rotation in a circular path, and a mounting (17) carrying a second means (19, 21; 119, 121) which comprises an external cylindrical guide surface (23; 123) whose axis extends parallel to the axis of rotation for guiding the magnetic tape along the magnetic head (15; 115). There is provided an actuating device (87; 187) by means of which one of the said means (13; 119; 121) is pivotable relative to the other means (19; 21; 113) about a pivotal axis between a stand-by position, in which the magnetic head (15; 115) is not in contact with the magnetic tape which is guided by the guide surface (23; 123), and a playing position, in which the rotating magnetic head enters into contact with the magnetic tape which is guided by the guide surface, which actuating device (87, 187) cooperates with a positioning means for positioning the movable means (13, 119; 121) in at least said playing position. Said pivotal axis is situated at a distance from and extends substantial parallel to the axis of rotation (9; 109) of the drive shaft (11), said pivotal axis being disposed in such a way relative to the axis of rotation (9; 109) and the guide surface (23; 123) that in the stand-by position the magnetic head (15; 115) as it rotates cannot contact the magnetic tape. (Fig. 2) </p> |
