| 摘要 |
<p>1. Automatic device for cleaning a magnetic reading head of a magnetic tape intended for a cassette recorder, comprising a retractable brush (8) adapted to be in contact with the reading head (9), means (18) for detecting the presence of a cassette inside the apparatus and means (1 to 4) for driving the retractable brush (8) controlled by the means (18) for detecting the presence of a cassette inside the apparatus, characterized in that it further comprises sensors (6, 7) of the position of the brush (8) constituted by fixed end of travel microcontacts cooperating with a stop member (5) integral with a brush-supporting rod (51, 41) movable perpendicularly to the reading head (9), and switching means (11 to 17) operationally coupled to said sensors (6, 7) to the means (18) for detecting the presence of a cassette, and to the means (1, 4) for driving the retractable brush in order to ensure selective drive in rotation and in translation of the retractable brush (8) on every cassette withdrawal, so that the brush (8) is imparted with a reciprocating movement during which it is in contact with the magnetic head (9) while rotating on its axis, and in that the driving means and the means for transmitting the movement operationally coupled to the brush (8) comprise a direct current electrical motor (1), a system of pulleys and belt (2, 3, 4), a fixed guiding nut (114) and a threaded rod (41) integral on the one hand with a receiving pulley (3) and on the other hand with the brush-supporting rod (51).</p> |
