| 摘要 |
PURPOSE:To supply a product of high reliability at low price, by enabling an original holder to move to a position for releasing an operation member only when the original holder is absent from the fixed position of its moving route. CONSTITUTION:A casing opening and closing device has second fitting members, such as support plates 34 having studs 33 arranged opposite to each other laterally above on the side of a lower frame 30B reverse to a pivot side. An operation plate 36 is mounted turnably in the direction of arrow A, A' on a rotary shaft 35 supported with upper frames 30A above the support plates 34, and the first fitting members, such as notched grooves 38 engageable with and disengageable from the studs 33 of the plates 34 are formed on the folded plate 37 of both the ends of this operation plate 36. Springs 41 are fixed between the fixing pieces 39 of the plate 37 of the plate 36 and pins 40 protruded from the sides of the upper frames 30A in order to hinder turning of the plate 36 in opening and closing.
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