| 摘要 |
<p>An X-Y signal generating device comprises two bands (11,11 min ) extending between and around two pairs of rollers (12,13) and (12 min ,13 min ). One band moves in the X-direction and one in the Y-direction, and one band is located inside the other. The rollers are mounted on a common block (14). Each band has a strengthened section (17, 17 min ) with a slot (18,18 min ) in it. An acutating key (21) is located at the crossover point of the two slots and may be moved freely in any direction, within limits, causing proportionate movement of the two bands around the rollers. XY control signals can be derived independently from the movement of the bands. The XY control signals can be produced by providing the bands with combined resistive/conductive surfaces and using conductive rollers to pass a current through the bands.</p> |
