JPS59133592A - Keyboard of electronic musical instrument - 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 [Technical Field of the Invention] The present invention relates to a keyboard device for an electronic musical instrument that improves assembly workability.

Traditionally, keyboard devices in electronic keyboard instruments such as electronic organs have consisted of a plurality of keys integrally formed of synthetic resin, etc., and a return spring, etc., which is made by press processing and is interposed between the keys to give the keys a return habit. We are prepared.

[Prior art]

By the way, various proposals have been made for the fulcrum structure of the key, and one known example is one using the shaft shown in FIG. 1. That is, 1 is the keyboard frame, 2
3 is a bracket disposed on the keyboard frame 1 and supporting a horizontal shaft 4. The shaft 4 is configured to pivotally support the rear end of the key 2. The key 2 is provided with a bearing hole 5 through which the shaft 4 passes. The sliding contact between the hole 5 and the shaft 4 ensures stable and smooth rotation of the key 2 and provides a good touch feeling. That's what I do.

However, such conventional fulcrum structures have a major drawback in that assembly and disassembly operations are extremely troublesome. That is, since a plurality of keys 2 are generally arranged in parallel in extremely close proximity, the all-key-shaft method is usually adopted.

Therefore, even if you want to remove a certain key 2, the shaft 4
cannot be removed unless all the keys and the bracket 3 are removed, and all the keys fall apart. Moreover, when assembling, it is extremely difficult to assemble unless all the keys are lined up in reverse order as the shaft 4 will not pass through. In addition, since the entire key is a shaft, it is difficult to provide the shaft 4 with a locking function for the movement of the key 2 in the left and right direction.

[Summary of the invention]

This invention was made in view of the above-mentioned circumstances, and includes a support shaft inserted into a bearing hole of a key so as to be relatively rotatable, and is held by a support shaft holding member disposed on a keyboard frame. The present invention provides a keyboard device for an electronic musical instrument that has an extremely simple configuration, realizes a single-key key system, and improves workability during assembly and disassembly.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 2 is a sectional view showing an embodiment of the keyboard device according to the present invention, and FIG. 3 is an exploded perspective view of the main parts. In these figures, reference numeral 10 denotes a key integrally formed from synthetic resin, and the key 10 has a substantially U-shaped cross section by being hollowed out on the back side, and has two holes on both sides at the rear end. A bearing hole 11 opening in the surface is provided.

An X support shaft 12 whose both ends are held by support shaft holding members 13 is inserted into the bearing hole 11.
The key 10 is supported so as to be rotatable in the vertical direction with the key 10 as the center. The support shaft 12 has approximately the same length as the width of the rear end of the key 10, and retaining portions 14A and 14B formed of protrusions extending in the axial direction are integrally formed on both end surfaces of the support shaft 12, respectively. It is installed protrudingly. Therefore, when the support shaft 12 is inserted into the bearing hole 11, the engaging portions 14A and 14B are respectively projected to the sides of the key 10.

The support shaft holding member 13 holds the support shafts 12 of the six keys 10 in common, and is made of synthetic resin or the like in a substantially comb-like shape, so that a plurality of support shafts 12 are arranged in parallel at predetermined intervals. Support walls 15A, 15B.

15C@... and supporting walls 15A and 15B
, 15C... Connecting portion 16 that commonly connects the rear ends of
In this case, the support shaft holding member 13 is shown as being fixed to the keyboard frame 1'' with a set screw. However, the present invention is not limited to this, and it may be detachably attached using a suitable engagement piece, or may be formed integrally with the keyboard frame by an outsert molding method. Each support wall 15A
, 15B, 15C... are provided with engaging portions 14A, 14B of the support shaft 12 at the center in the height direction of both side surfaces.
A locking portion 17 consisting of an engaging groove is formed correspondingly to each of the locking portions. These locking portions 1T are connected to each support wall 15A,
The retaining portions 14A, 14B extend rearward and approximately horizontally from the front end surfaces of the retaining portions 15B, 15C, etc., into which the retaining portions 14A, 14B are inserted. Note that two adjacent support walls 15A and 15
B, the interval between 15B and 15C, fist, is set corresponding to the width of the rear end of the six keys 10 (white keys and black keys).

A substantially hook-shaped stopper 20 is integrally hung on the lower surface of the front end of the key 10 and extends downward from the lower surface 21 of the front end of the keyboard frame 1 n1. A lower limit stopper 22 and an upper limit stopper 2 are provided on the upper and lower surfaces of the front end of the keyboard 4-frame 1 to set the vertical rotation range of the key 10.
3 is fixed. In this case, FIG. 2 shows a state in which the lower surface of the front end of the key 10 comes into contact with the lower limit stopper 22 due to the key press operation, and when the key 10 returns to rotation due to the force of the return spring 25, which will be described later, the stopper 20 comes into contact. The contact surface 20a is configured to abut the upper limit stopper 23 from below and lock the key 10 in the initial position. Further, when the key 10 is pressed against the return spring 25, the actuator 26 provided integrally with the key 10 operates the key switch 2T fixed to the back surface of the keyboard frame 1, and the key 10 is pressed. 1
It is configured to electrically generate a musical tone corresponding to 0.

A wall 28 is integrally provided near the rear end of the inner surface of the key 10, and the rear end of the return spring 25 is locked by the wall 28 of the spring receiver.

On the other hand, the front end of the return spring 25 is locked by a locking portion 29 provided on the upper surface of the keyboard frame 1. The return spring 25 is a band-shaped flat spring formed by punching out a metal mounting plate of an appropriate thickness, and the key 10 and the keyboard frame 1 are
It is installed in a buckled state between the therefore,
The return spring 25 is buckled in an arc shape as shown in the figure, and the reaction force of the spring 25 generated by this deformation imparts a clockwise rotational habit to the key 10 and urges it backward. In addition, 31 is a key guide that is integrally provided at the front end of the keyboard frame 1 to restrict and prevent the key 10 from turning in the left and right direction, and 32 is a key guide that is used to make the key 10 heavier so as to obtain a key touch feeling similar to that of a general piano. This is a heavy case that is disposed on the lower surface of the front end of the key 10 via a gasket 33.

According to the keyboard device having such a configuration, the key 10 is pivotally supported by the support shaft 12, so that stable and smooth key operations can be performed.

Further, since the support shaft 12 is attached to each of the six keys 10 separately and independently and is held by the locking portion 17 of the support shaft holding member 13, the retaining portions 14A, 14
If B is pulled out from the locking part IT, the key 10 can be removed from the support shaft holding member 13 separately and independently from other keys, and -
Realizes a single key system.

Furthermore, attachment and detachment of the support shaft 12 to and from the key 10 and the support shaft holding member 13 are extremely simple and easy. In addition, since the key 10 is urged backward by the return spring 25 as described above, the support shaft 12 does not separate from the support shaft holding member 13 during normal playing.
Therefore, stable key press operation is possible. Moreover, each support wall 15A, 15B, 1 of the support shaft holding member 13
5C... has a function of restricting and preventing movement of the key 10 in the left and right direction. FIG. 4 is an exploded perspective view of main parts showing another embodiment of the present invention. In this embodiment, engaging portions 14A, 14B consisting of long grooves in the diametrical direction are provided on both end surfaces of the support shaft 12, and said retaining portions 14A are provided on both side surfaces of each support wall 15A, 15B, . . . of the support shaft holding member 13. , 14B, a locking portion 17 made of a protruding strip is integrally provided in a protruding manner. In this case, the dimension t! between the retaining portions 14A and 14B! is approximately equal to the width of the rear end of the key 10, and a pair of opposing locking portions 17 and 1
The interval L1 with 7 is younger than 7- Senju Sai. Further, the total length L2 of the support shaft 12 is slightly smaller than the distance L3 between the adjacent support walls 15A and 15B.

FIG. 5 is an exploded perspective view of a main part showing still another embodiment of the present invention. In this embodiment, the support shaft holding member 13 is constituted by a plurality of cut and raised pieces 50a, sob, 50c, 11, etc. formed by cutting and raising the keyboard frame 1, and protrusions are provided on both end surfaces of the support shaft 12. Retaining parts 14A and 14B consisting of bodies are provided, and each cut and raised piece 50a
, 50b, 50e... are locking W5 consisting of long grooves.
17. In this case, the support shaft holding member 1
3 is integrally constructed with the keyboard frame 1, the number of parts can be reduced and assembly workability can be further improved.

Incidentally, in each of the present embodiments, the case where the retaining parts 14A, 14B and the locking part 17 are provided in the horizontal direction is shown.
Of course, the present invention is not limited to this configuration, and may be installed vertically.

〔Effect of the invention〕

As explained above, the keyboard device for an electronic musical instrument according to the present invention includes retaining portions protruding from both end surfaces of the support shaft that is inserted into the bearing hole of the key and rotatably supports the key. Since this retaining portion is configured to engage with the locking portion of the support shaft holding member disposed on the keyboard frame, the keys can be operated smoothly and a good touch feeling can be obtained. In addition, the work of attaching and removing the support shaft to and from the key and support shaft holding member is easy, and the effects are very great, such as realizing a single key shaft system and dramatically improving assembly workability.

[Brief explanation of the drawing]

Fig. 1 is a side view of a main part showing an example of a fulcrum structure in a conventional keyboard device, Fig. 2 is a sectional view showing an embodiment of a keyboard device according to the present invention, and Fig. 3 is an exploded perspective view of a main part of the same device. 4 is an exploded perspective view of a main part showing another embodiment of the present invention, and FIG. 5 is an exploded perspective view of a main part showing still another embodiment of the invention. 1.1...Keyboard frame, 10...Key, 11~...Bearing hole, 12...Support shaft, 13...Support shaft holding member, 14A, 14B...Response Joint, 1
5A, 15B, 15cm fist support wall, 17e**e locking part. Patent applicant Masaki Yamakawa (and 1 other person), agent of Nippon Gakki Mfg. Co., Ltd. 11- () 672-

Claims (1)

[Claims] A key disposed on a keyboard frame, a support shaft provided with retaining portions on both end surfaces and inserted into a bearing hole provided at the rear end of the key so as to be relatively rotatable, and this support shaft. A keyboard device for an electronic musical instrument, comprising: a support shaft holding member disposed on the keyboard frame and having a locking portion into which the holding portion is inserted.