JPS6239429Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a keyboard guide structure in an electronic keyboard musical instrument.

In general, electronic keyboard musical instruments have several octaves (2.5 to 4 octaves) of white and black keys arranged on the keyboard chassis, and when these keys are pressed, the keys rotate and the keys placed at the bottom of the keyboard are arranged. The pressing part further presses the movable contact located below it,
A fixed contact on the printed circuit board is made conductive to generate a predetermined musical tone.

In such a keyboard electronic musical instrument, a guide member is provided to prevent the keys from swinging laterally when the keys are pressed and to evenly arrange a large number of keys.

By the way, as a conventional guide member, in order to arrange several octaves worth of keys (white keys) at once,
It is formed into a single long plate. A problem with such products is that they are susceptible to bending deformation during manufacturing, installation, and handling.

Furthermore, in order to solve this problem, there is a system in which the guide member is divided and arranged in sections corresponding to one octave. In this type of device, when the divided guide plate is attached to the keyboard chassis with screws or the like, the ends of the guide members adjacent to each other are attached with a slight distance from each other.
This is to enable positional adjustment of the guide members and to prevent variations in dimensions between the guide members. however,
When the ends of the guide members are spaced apart in this way, not only are these gaps noticeable and undesirable in appearance, but a positioning jig must be used to mount the guide members in accurate positions. Therefore, there is a problem that assembly work takes time and work efficiency is poor.

This idea was created in consideration of the above points, and it is possible to arrange a large number of keys regularly at equal intervals, and also to easily attach the guide member without using the above-mentioned jig. An object of the present invention is to provide a keyboard guide structure capable of improving the mounting accuracy.

An example of this invention is shown below in Figures 1 and 2.
This will be explained in detail based on the figures. In this diagram,
Reference numeral 1 denotes a keyboard chassis, on which several octaves of white keys 2, 2 and black keys 3, 3 are arranged. The rear end of each of these keys 2 and 3 is rotatably held by a key support member 4 provided at the rear end of the keyboard chassis 1. This key support member 4 includes a support portion 5 whose upper end is formed in an arc shape to rotatably support the lower surface of each key 2, 3, and a support portion 5 that elastically presses the upper surface of the keys 2, 3. It is composed of a presser part 6 for holding.

Further, a pressing part 7 is provided at the bottom of each key 2, 3, and when the key is pressed, a switch member 9 provided on the printed circuit board 8 is pressed, and the switch member 9 is pressed against the pair of keys on the printed circuit board 8. A bowl-shaped elastic member is placed to cover each pair of fixed contacts, and a movable contact is provided within the elastic member to conduct the fixed contacts in accordance with the deformation. .

As shown in Fig. 2, the keys 2, 3 each have a hollow portion 10 formed inside. Guide portions 13, 14 of guide members 11, 12 are inserted into the tip of the hollow portion 10 to prevent the keys 2, 3 from swaying sideways when the keys are pressed, and to arrange the white keys 2, 2 evenly.
The guide members 11 and 12 are provided on the keyboard chassis 1 to guide the white keys 2 and the black keys 3, respectively, in vertical movement.

Here, the guide member 11 will be explained in particular. This guide member 11 is molded from a smooth synthetic resin with a small coefficient of friction such as polyacetal or Teflon. Moreover, this guide member 11 is made of several pieces (Fig. 11a and 11b)
It is divided into. In the case of each of the guide members 11a and 11b divided in this way, these are fitted in an inverted trapezoid shape (a shape that gradually widens from the opening side to the bottom side) at the end of the guide member 11a among the mutually adjacent ends. A fitting concave portion 15 is formed, and a fitting convex portion 16 that fits therein is formed at the end of the other guide member 11b. Therefore, when the fitting protrusion 16 is fitted into the fitting recess 15, the guide member 11a and the guide member 11b are connected, and at the same time, the guide part 13 and other guides at this connection point are connected. The distance from the portion 13 becomes equal. Guide plates 11a, 11 configured in this way
b is attached to the keyboard chassis 1 with screws 17.

In the figure, reference numerals 18 and 19 are sound deadening members such as felt that soften the contact between the white key 2 and the black key 3.

Next, the guide member 11 configured as described above
A case where the keys 11a and 11b are attached to the keyboard chassis 1 will be explained. First, guide members 11a, 11
Attach any one of the guide plates 11a to the keyboard chassis 1 with screws 17, 17. When the guide member 11a is attached in this manner, the corresponding white keys 2 are arranged uniformly by the guide portion 13 of the guide member 11a. After this,
The fitting protrusion 16 of the guide member 11b is inserted in correspondence with the fitting recess 15 of the guide member 11a described above. In this case, since each guide member 11a, 11b is molded from a synthetic resin with a small coefficient of friction such as polyacetal or Teflon, the fitting convex portion 1
6 is smoothly inserted into the fitting recess 15. When the fitting protrusion 16 is fitted into the fitting recess 15 in this manner, the guide member 11a and the guide member 11b are connected and positioned. That is, since the fitting recess 15 is formed in an inverted trapezoidal shape and the fitting protrusion 16 is formed in a shape corresponding to this, vertical positioning is achieved and the guide members 11a, 11b are Longitudinal positioning is also provided. In this case, especially the fitting recess 1
5 and the guide portion 1 corresponding to the fitting convex portion 16
The intervals of 3 and 13 are set to a predetermined length. This is because the fitting recess 15 and the fitting protrusion 16 function as a jig. After this, the guide member 11
b to the keyboard chassis 1 with screws 17, 17. At this time, since the fitting recess 15 and the fitting protrusion 16 of the guide member 11b are connected, one end of the guide member 11b is fixed, making screwing work very easy and efficient.

Each guide member 1 attached in this way
The guide portions 13 of 1a and 11b are inserted into the hollow portions 10 of the white keys 2 to uniformly arrange the white keys 2 at equal intervals.

Further, this invention is not limited to the fitting recess 15 and the fitting protrusion 16 of the above-described embodiment, but may be configured as shown in FIG. 3, for example. That is, a through hole 21 having a rectangular cross section is formed at the end of one of the guide members 20, and an opening 22 that opens this through hole 21 and the end of the guide member 20 is formed.
1 and an opening 22, and an engaging part 25 that fits into the through hole 21 and an opening 22 is formed at the end of the other guide member 24.
A fitting convex portion 27 consisting of a connecting portion 26 that fits into and connects the engaging portion 25 and the end of the guide member 24.
The guide member 20 and the guide member 24 are formed by fitting the fitting recess 23 and the fitting protrusion 27.
and position them in the longitudinal direction and in the vertical direction. When the respective guide members 20 and 24 are connected and positioned in this way, the white keys 2 for several octaves are uniformly arranged at equal intervals as in the above-described embodiment.

Note that this invention is not limited to the fitting recess 23 and the fitting protrusion 27 of the above-described embodiment, and may have other shapes. That is, the through hole 21 of the fitting recess 23 described above is formed to have a circular cross section or a polygonal shape such as a triangle.
Even if the engaging portion 25 of the fitting convex portion 27 is formed so as to fit into the fitting portion 1, the same effects as those of the above-mentioned embodiments can be obtained.

As explained above in detail, in the keyboard guide structure according to this invention, a large number of keys are arranged at equal intervals, and the guide member that guides the vertical movement of each key is divided into a plurality of parts. Since the configuration is such that connecting portions for positioning and connecting these guide members are provided at mutually adjacent ends of each guide member.
The positions of the guide members can be determined by a simple operation of connecting the divided guide members, and the attachment of the guide members is facilitated and the work efficiency is improved. Furthermore, the spacing between the guide members in the connected portions can be set accurately without using a jig or the like, and as a result, there is an effect that a large number of keys can be uniformly arranged at equal intervals.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of a keyboard electronic musical instrument according to this invention, FIG. 2 is a partially cutaway front view of the guide plate and keys thereof, and FIG. 3 is a front view showing another embodiment. 1... Keyboard chassis, 2... White key, 3... Black key, 4... Key support member, 9... Switch member, 1
0...Hollow part, 11, 11a, 11b, 20, 2
4... Guide member, 15, 23... Fitting recess, 1
6, 27... Fitting convex portion.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of keys are arranged at equal intervals, a guide member that guides the vertical movement of each key is divided into a plurality of parts, and each of the divided guide members is adjacent to each other. A first fitting portion and a second fitting portion are formed at the end portions to fit into each other, and the first fitting portion and the second fitting portion are fitted to each other so that the respective guide members are connected to each other. The guide structure of the keyboard is made up of two interconnected parts. (2) The first fitting portion is a substantially concave-shaped fitting recess with a narrow opening side, and the second fitting portion is formed in a substantially convex shape that fits into the fitting recess. A keyboard guide structure according to claim 1, which is a fitting convex portion.