PURPOSE:To improve operability and to facilitate assembly by positioning a link-coupled driver unit which moves freely along a groove through a click plate with a moderation hole and a ball. CONSTITUTION:The driver unit fixed to a support shaft 8 coupled with a link 7 is moved freely along the slide groove 3 of a device main body 1 and easily and securely positioned in the desired moderation hole 12a by the ball 13 which is applied with the pressing force of a spring 9 and the click plate 12 provided with the moderation hole 12a. Consequently, the positioning operativity of the driver unit is improved and the device is easily assembled.
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