| 摘要 |
A chamber ( 2 A) adapted to dismountably mount respective units ( 10 ) and ( 10 ) is formed in a main body ( 2 ). Guiding members ( 37, 38, 39 ) are formed on each of the opposite side walls of the chamber, and guided portions ( 11 A, 11 B, 24 A, 24 B) formed on opposite sides of the respective units (10, 20) are engaged with the guiding members so that they are guided to the mounting position. Near the initial portions ( 37 A, 38 A, 39 A) of the respective guiding members ( 37, 38, 39 ) in the main body ( 2 ), an indicating member ( 41 ) including indicators ( 41 a , 41 b , 41 c) which indicates initial positions of the respective guiding member ( 37, 38, 39 ). Consequently, the initial positions of the guided members ( 11 A, 11 B, 24 A) and ( 24 B) of the respective units ( 10, 20 ) can be visually conlirmed by the indicators ( 41 a , 41 b , 41 c), which improves the operability of insertion of the respective units ( 10, 20 ).
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