| 摘要 |
A key leveler for leveling keys on the keyboards of musical instruments, a computerized key leveling system, and methods of use thereof. The key leveler includes a guide rail horizontally disposed above the keyboard supported by a pair of mounting clamps at opposite ends that grip the musical instrument. The guide rail is leveled over the keyboard using pairs of swing arms and draw devices. A bearing block is slidably connected to the guide rail to which a tubular gauge holder support of a gauge holder mounts. A longitudinal bore extends through the gauge holder support that slidably receives a mounting stem with stylus of a height indicator retained by a thumbscrew. A push rod closely slidably fits within the longitudinal bore extending downwardly past the gauge holder support having a top end that engages the stylus and a convex bottom end that contacts the keys. An index cylinder is slidably disposed about the gauge holder support and push rod. The push rod is upwardly spring-biased against the stylus using a spring disposed about the push rod. A spring adjustment screw threadably engages the index cylinder and bears against the spring to adjust spring force applied to the push rod. The index cylinder may be positioned in respective park, rest, and depressed positions in which the bottom end of the push rod is at respective heights to clear the keys and for measuring heights of the keys in respective rest and depressed positions. The key leveling system includes the key leveler with an electronic height indicator, a laptop computer, and a software program that runs on the computer to simultaneously calculate optimal shimming for all of the keys to level the keyboard.
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