| 摘要 |
<p>A normal/reverse mode changing mechanism for a tape transport apparatus comprises a mode selecting lever (103), cam arrangement (45), and an electromagnet (81), and one of two tape running modes is selectively obtained due to changing the number of current pulses supplied to the electromagnet (81). The mode selecting lever (103) has such a function as to move a plurality of controlling members (115), such as a drive gear (43) engaged selectively with one of the reel base (22, 22 min ) gears, and a lever, which can selectively press one of the two pinch rollers (32, 32 min ) against the corresponding one of two capstans (20, 20 min ) for controlling the direction in which the tape (18) is running. The cam arrangement (45) has such a function as to hold the mode selecting lever (103) selectively in one of two positions: a first position for obtaining the first tape running mode by a combination of a first pinch roller (32) and a first capstan (20), and a second position for obtaining the second tape running mode by another combination of a second pinch roller (32 min ) and a second capstan (20 min ). The electromagnet (81) has such a function as to control the angle of rotation of the cam arrangement (45) and the position of the mode selecting lever (103).</p> |
