PURPOSE:To enable an assembly work to be done surely by holding, in such a way as is able to relatively slide in the horizontal direction, a pair of the upper and lower level trays provided above key tops placed with their back- surfaces turned upward. CONSTITUTION:An actuator spring 6 is inserted into the agreeing portion of both holes 5, 8 from the upper part with a smaller diameter coil portion 6b turned downward. Next, a knob 12 is operated, making the lower part tray 4 slide-move horizontally along the upper part tray 3, thus making the larger diameter portion 8b of the unusual diameter hole 8 of the lower part tray 4 agree with the circular hole 5 of the upper part tray 3. Then, because of the larger diameter portion 8b being a little larger than the larger diameter coil portion 6a of the actuator spring 6, this actuator spring 6 falls through the larger diameter portion 8b due to its self-weight. And, the smaller diameter coil portion 6b of the actuator spring 6 is inserted into the inside of the circular space 13a of a key top 13.
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