| 摘要 |
<p>PURPOSE: To easily provide a built-in switch by not only making a conductive coat layer pass each roll pair but also always engaging it with them and electrically connecting it up to contacting points through rolls of each roll pair. CONSTITUTION: The key switch built in an operation key 21 has contacting points 31 and 32, and these contacting points are slidably connected to conductive coat layers 26 and 26' on bands 11 and 11' to electrically connect them to roll shafts 15, 15', 16 and 16' and rolls 12, 12', 13 and 13'. Coat layers 26 and 26' pass around these rolls and are always engaged with them. The connection to an external control circuit 35 through roll shafts 15 and 15' is completed by the action of a contacting point 34 of the key switch. It is necessary for the built-in switch to be movable during the operation, and consequently, slide contacting points with less friction are formed as contacting points 31 and 32.</p> |
