JPS6152696A - Action mechanism for upright piano - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Field of Application The present invention is capable of reducing the weak tone of a piano string of 1 pM (4') by 1! Concerning the action UN h'i of an upright piano that presses the soft pedal Bat IN for #.

(b) Conventional technology There is a soft pedal 814M as a device for obtaining a weak tone in the J3 piano string R configuration.

This means that by depressing the pedal, the starting position of the hammer can be moved closer to the string, i.e., the string is struck! [! By compressing the number 1, the force with which the hammer hits the string is weakened, producing a weak tone effect.

In a conventional upright piano, when the soft pedal is depressed as shown in FIG.
push forward. In other words, the hammer 19 is moved to a position closer to the string 20 than its original position, and is set to start the string-striking movement from that position.

However, since the hammer 19 and the hammer butt 21 are fixed to each other and are integrated, the hammer 19
As a result, a gap G is generated between the hammer butt 21 and the lower end surface of the jack 22.

This is generally referred to as lost motion, and it gives a very unpleasant feeling when typing the keys, and at the same time makes it difficult to control the keys.

Several proposals have been tried in the past to overcome these shortcomings.

For example, in the United States, light
ic p 1ano Tuning and Ser
vicingJ (1963 edition) and Tokuko Sho 41-20
This can be seen in Publication No. 863.

The purpose of both of these is to erase the lost motion, but in terms of content, an intermediary is placed between the keyboard and the key, and this intermediary is connected to the soft pedal. When you step on it, this intermediary moves in parallel and the uizben is lifted up.

However, the number of these intermediaries is the same as the number of keys, or they are necessary, and the key touch changes because the structure becomes compound or the contact points change due to the movement of the intermediaries, and the movement ratio between the key and the wippen changes. There is a problem that it becomes difficult.

(C) Problems that Rming tries to solve Explanation of the above-mentioned prior art / Jl As is clear, the drawback of the soft pedal mechanism of an upright piano is that when the soft pedal is depressed, it causes lost motion and the hammer The problem is that a gap is created between the bat and the upper tip of the Jisek, and the present invention attempts to solve this drawback.

(d) Means for solving the problem In the present invention, the key rail is not fixed to the shelf board, but is installed so that it can move up and down, and is supported by a key rail connecting rod that stands up on the soft pedal, and when the soft pedal is depressed. Then, the key rail is lifted up so that there is no gap between the tip of the trigger and the hammer butt, thereby solving the problem of lost motion.

(e) Example Next, embodiments of the present invention will be explained based on the drawings.

First, explanation will be given based on FIG. 1, FIG. 2, FIG. 3, FIG. 4, and FIG. 5.

Fig. 1 is a schematic diagram illustrating the outline and operation of the present invention, and Fig. 2 is a schematic diagram showing an outline of the present invention and related parts thereof. 51 and 3 do not show the structure of the key frame in the present invention;
The figure is a sectional view showing the structure shown in Fig. 3 in operation, and Fig. 5 is a perspective view showing the key rail shown in Fig. 3, with the main parts of the key frame clearly shown ( The large number of keys and key balance bottle caps in C are omitted.

The structure of the key frame consists of a key front rail 101a, a key balance rail 101b, and a key rail 101C.The key rail 101C is not fixed to the fence plate 6, but can be moved up and down to the key balance rail 101b on a hinge 104 via a crosspiece 102. It is attached to the soft pedal 112 and connected to the soft pedal 112 by a key rail connecting rod 108.

The key rail connecting rod 108 stands upwardly from the soft pedal. The key front rail 101a and the key balance rail 101b are both fixed to the shelf board 6 with screws 3. 7 is a key balance bin.

FIG. 6 shows another embodiment of how to support the key rail 101c. In this embodiment, the key rail 101c is fully bent +! i.

9 is rotatably fitted into the support fitting 110. The other parts (111) are not substantially different from the previous embodiment.

In either embodiment, it is important that the key rail 101C is not fixed to the shelf board but is installed so that it can move up and down.

As a precaution, the most common method and structure for attaching a Bt key frame to a conventional upright piano will be explained based on Figure 7. It consists of a rail 1b and a key rail 1C, which are integrally framed by crosspieces 2 and fixed to a shelf board 6 with screws 3.

Note that there is a configuration in which the key rail 1C is separated from the key balance rail 1b, but even in this case, the key rail 1C is fixed to the shelf board 6 by screws 3.

('') Function The function of the present invention will be explained below with reference to FIGS. 1, 2, 3, and 4.

First, when the soft pedal 112 is depressed, the ladle 113a
, the hammer under rail 115 is actuated via the balance rod 113 and the uplift rod 114 to bring the hammer 119 closer to the string 20. This action is similar to that of a conventional upright piano, but in the present invention, the following action is performed simultaneously with this action.

That is, in the present invention, the key rail 101C is not fixed to the shelf board 6, but is installed so that it can move up and down, and is supported by the key rail connecting rod 108 that stands on the extended portion 112b on the back side of the soft pedal 112. Therefore, when the soft pedal 112 is depressed, the entire key rail 101c is lifted upward by a certain amount. When the key rail 101c is lifted, the key rear-5C portion is also pushed up.

J5, the key 5 rotates around the key balance pin 7 as a fulcrum, so at this time, the key front 5b portion is lowered to the lowest position.

Since the wippen 23 and jack 22 are pushed up in proportion to the amount of time that the key rear 5c portion is pushed up, no gap is created between the tip surface of the jack 22 and the hammer butt 21.

(g) Effects of the Invention As described above, the present invention makes it possible to move the key rail up and down without fixing it to the shelf board, and by operating it with a soft pedal, it is possible to fill the gap between the jack end surface and the hammer butt. C, it has the effect of eliminating lost motion that is harmful to key touch.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram explaining the outline and operation of the present invention, Fig. 2 is a perspective view showing the outline of the invention and its related parts, Fig. 3 is a sectional view showing the structure of the key frame in the invention, 4
The figure is a sectional view showing the state when the structure shown in Fig. 3 is activated, and Fig. 5 is a perspective view showing the key rail shown in Fig. 3.
FIG. 6 is an oblique pA diagram showing another embodiment of how to support the key rail, FIG. 7 is a sectional view showing the structure of a conventional key frame, and FIG. 8 is a schematic explanatory diagram of the prior art. In the drawing, 101c is a key rail, 6 is a shelf board, 10
8 is a key rail connecting rod, 112 is a soft pedal, 21 is a hammer butt, and 22 is a jack. Figure 1 Figure 2 Figure 3 Figure 4 Figure 7 Figure 5

Claims (1)

[Claims] The key rail is not fixed to the shelf board, but can be moved up and down,
An upright piano characterized in that when the soft pedal is depressed, the key rail is lifted and no gap is created between the tip of the jack and the hammer butt by supporting the key rail with a connecting rod that stands up on the soft pedal. action mechanism.