The heart part of the action piano is equivalent to the engine of a car and the engine of an airplane. It is one of the foundations of the sound source part. The durability and failure rate of the action directly affect the normal use time of the piano, that is, the life of the piano. When choosing a piano, many people only check the sound and feel of the piano, ignoring the inspection of the action, resulting in constant failures in use, and often require a tuner to come to the door to tidy up.
The action machine corresponds to 88 black and white keys, and is composed of 88 sets of mechanical parts assembled through a rack. The mechanical parts are required to be neatly arranged, run smoothly, have a sensitive response, and have no noise.
As far as the traditional wooden action used in the piano is concerned, first of all, the color of the wood is uniform and uniform, the geometric surface of the parts is crisp, the felt texture is good, and the metal parts have a high finish. The whole action looks like every part is in a line from a few lines in the horizontal plane. When a chord is played, the pressed key action parts are all in a vertical line.
When the action machine is working, the parts connected to the axle frame can be flexibly rotated forward and backward without swaying from side to side. Swinging side to side will deflect the hammer stroke. Pronunciation is abnormal, and the felt will wear out quickly. All parts will not shake left and right when the screws are tightened, and they are not sluggish at the same time, and have good sensitivity. When playing, there is no noise when the action is in motion, the spacing of the parts is even, the level is flat, and there is no glue flowing. Depress the left pedal, the mallet is closer to the string, and the stroke is reduced by 1/3. Step on the middle pedal, the soft flannel can cover the hammer to achieve the effect of soft sound.
Step on the right pedal, all the damper heads are loosened from the strings, and the front and rear actions are very consistent, and the heights of all damper heads are on the same horizontal line. After all these simple inductions, the action machine, as the core part of the piano, has a huge impact on the sound quality of the piano. It is responsible for transmitting the strength of the player's hand touching the keys through the action of the action machine in the process of piano pronunciation. The mechanical structure faithfully transmits and responds to the action of the hammer. It can be said that the step-by-step evolution of the piano action machine is largely to reflect the player's playing more faithfully and sensitively.