| 摘要 |
<P>PROBLEM TO BE SOLVED: To secure durability with a simple constitution and to realize a stable switch operation. <P>SOLUTION: A pitch specification part SHI comprises a fixed part KO, an operator PST and a pitch switch part. The pitch switch part includes a photocoupler 15. Two rail-shaped guide ribs 13A and 13B are vertically extended in a single body at the upper half part of a left-side fixed part KOLa and two rail-shaped guide ribs 22A and 22B are similarly extended at the upper half part of a right-side fixed part KORa. A shutter window 38b is formed at a back plate part 38 of the main body 31 of the operator PST. When the operator PST is pressed down, the opposite surface 38a of the back plate part 38 and the inner surfaces 36a a and 37a of side plate parts 36 and 37 come into slide contact with the guide ribs 13A and 13B, and the back surface 38c comes into slide contact with the guide ribs 22A and 22B, thereby guiding the reciprocating operation of the operator PST over the whole stroke. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
