| 摘要 |
PROBLEM TO BE SOLVED: To reduce the manufacture cost by increasing the strength of a metal mold and improving its handling and productivity, and to actualize a key guide means which is stable and high in reliability. SOLUTION: This device consists of key units 100 constituted by supporting keys 1 having guided projection streaks for key pressing/releasing operation on a common support part 3a through swing support parts 2 so that they can swing freely in key pressing/releasing directions and a support means 5 having key guides 42 which support the units 100 through the common support part 3a, restrict the movement of the keys 1 in the key array direction, and guide the guide projection streaks. In this case, white keys having notches 53 for black key arrangement in one-side walls S1 between white keys of the units 100 are provided with guided projection streaks 40 which come into contact with the key guides 42 inside the side walls S2 having the cuts at intervals with the side walls S2 so that they are dropped from the ceiling walls 1b of the keys. |
