| 摘要 |
<p>The invention proposes a device (20) comprising a housing, and two coding shafts (32L, 32T) driven in rotation by a trackball (30), and in which each shaft is tied in rotation to a mobile coding element (44L, 44T) belonging to a generator of control signals, characterized in that the signal generator comprises: - a mobile contact rod (70L, 70T) which, at rest, runs vertically with its lower span (78L, 78T) received between two fixed and opposed contact lugs (P5L-P6L, P5T-P6T), and which is tiltably mounted; and - a toothed pinion (44L, 44T), tied in rotation to the shaft, between two consecutive teeth of which is received an upper span (68L, 68T) of the mobile rod (7OL, 70T), in such a way as to cause the tilting of the rod so as to establish electrical contact between the lower span and one or other of the two contact lugs.</p> |
