JPS6016954Y2 - Action device for keyboard instruments - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an action device for a keyboard instrument.

Conventionally, the mechanism of an action device for a keyboard instrument such as a piano is complicated and includes a large number of parts, and therefore requires sophisticated and complicated assembly work and has the disadvantage of high production costs.

Various attempts have been made to simplify the structure in order to overcome this drawback, but the results are not yet satisfactory.

The present invention was developed in view of the above-mentioned current situation, and the purpose is to provide an action device with a simple structure that allows for more freedom in determining the exterior design compared to conventional action devices. .

To achieve this objective, the present invention uses a standard pivot structure Wibben assembly and a jack
By eliminating the assembly, the number of bushing and bottle parts and support structures is reduced.

The present invention consists of a hammer head that strikes the sounding body, a rotatable hammer head that is rotatably supported at its base end and has a hammer and spatula at the other end, and a hammer roller that is attached to the hammer butt and abuts the jack. a jack that contacts the hammer roller and pushes up the hammer butt; a jack spring made of an elastic member that pivots the jack around the key and works to maintain the angle between the key and the jack; It has an angle adjustment means that adjusts the angle at which the key and jack strike against the force of the spring, and when the key is pressed down, the jack comes into contact with the hammer roller of the hammer and butt, and the hammer and butt is pushed up, causing the hammer to sound. When the hammer/butt that hits the body rotates, the hammer/roller of the hammer/butt rotates, causing the abutment part of the hammer/roller to deviate from the direction in which the jack is pushed up, resulting in a let-off state in which the jack does not push up. It is.

An embodiment according to the present invention will be described.

FIG. 1 is a side view of an action device according to an embodiment of the present invention.

When the front end 1a of the keyboard 1 is pressed down, the rear part 1b of the keyboard
The hammer head 15 supported by the upper surface of the hammer cushion 12 attached to the hammer cushion 12 is pushed up.

This state of contact between the hammer cushion 12 and the hammer head 15 is such that the hammer roller 6 is mounted facing downward at the middle part of the hammer butt 7 having the hammer head 15 at the tip.

This continues until the gap t between the jack 2 and the hammer roller 6, which is the contact portion with the jack 2, becomes zero.

After the gap t becomes zero, the above-mentioned contact state is released and the hammer head 15 is hammered by the jack 2.
It is pushed up by pushing up the roller 6.

This push-up operation is performed by a virtual straight line 1-1' connecting the jack center pin 5 that pivots the key 1 and the jack 2 and the rear corner 2a of the keyboard of the jack 2, the hammer butt center pin 9, and the hammer roller 6. This continues until the position of the rear corner 2a of the keyboard of the jack 2 coincides with the intersection with the virtual circumference line m-m whose radius is the length R to the center of .

Furthermore, when the rear part 1b of the keyboard is further raised, the contact angle between the jack 2 and the circumference of the hammer roller 6 becomes larger, as shown in FIG. It's gone and let off.

After pushing up the damper 13 with the rear part 1b of the keyboard, the string 14 is struck with the hammer head 15.

Incidentally, even after being let off, the jack 2 is pressed against the side of the hammer roller 6 by an elastic member having appropriate elasticity, such as a jack spring 4.

Therefore, it is possible to automatically let off jack 2 without installing a regulating device as in the past, and the movement of the key and the hammer are performed with a minimal relationship, resulting in good action response. Action devices can be configured.

As shown in FIG. 2, a jack is pivoted to the rear of the key 1.

When the jack center pin 5 pushes up the jack 2, the head of the jack 2 comes into contact with an abutment part provided on the hammer butt 7, for example, a hammer roller 6.

The abutting position of the hammer roller 6 and the jack 2 is determined by an adjusting means for adjusting the angle at which the key 1 and the jack 2 strike. This can be easily determined by adjusting the angle of the pressing key and jack.

Further, the height of the jack 2 can be adjusted by rotating the head of the jack 2, thereby making it possible to adjust the length of the jack 2 using a screw.

Therefore, an action device with fewer moving parts can be constructed, a horizontal ground type can be used, and key touch is improved.
The height of the action device can be lowered.

As described above, according to the present invention, since the angle at which the key and the jack strike can be adjusted, it is possible to provide an action device that allows easy let-off adjustment.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of an action device according to the present invention, and FIGS. 2, 3, and 4 are partial side views for explaining its operation. 1 is the keyboard, 2 is the jack, 3 is the regulating screw, 4 is the jack spring, 5 is the jack center pin, 6 is the hammer roller, 7 is the hammer butt, 8 is the flange, 9 is the hammer butt center・Pin, 10 is action rail, 11 is back check, 12 is hammer cushion, 13 is damper, 14 is string, 15 is hammer head.

Claims (1)

[Scope of utility model registration request] a hammer head that strikes the sounding body; a hammer butt that is rotatably supported at its base end and has the hammer head at the other end; and a hammer roller that is attached to the hammer butt and comes into contact with the jack; a jack that contacts the hammer roller and pushes up the hammer butt;
a jack spring that pivots the jack to the key and works to maintain the angle at which the key and the jack strike, and an angle adjustment means for adjusting the angle at which the key and the jack strike against the force of the jack spring. and the key is pressed down so that the shack comes into contact with the hammer roller of the hammer butt, and the hammer hits the sounding body when the hammer hat is pressed down.
This action device for a keyboard instrument is characterized in that when the hammer/butt rotates, the hammer roller of the hammer/butt rotates, and the abutting part of the hammer roller deviates from the direction in which the jack is pushed up, thereby causing a let-off state.