JPS60162295A - Keyboard unit for keyed 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 (Field of Industrial Application) The present invention relates to keyboard devices for various keyboard instruments, such as electronic musical instruments.

(Structure of a conventional example and its problems) FIG. 1 is a sectional view of a conventional keyboard device for an electronic musical instrument. In the figure, the white key or black key 1 (hereinafter referred to as key 1) is
The rear end is locked to the chassis 2, and with this as a fulcrum, the spring 3 always urges it to rotate upwards, and the stopper 4, which is disposed on the underside of the key 1, prevents the rotation. regulated. An actuator 5 is integrally formed on the lower surface of the key 1, and is configured to turn on a switch circuit 6' fixed to the lower part of the chassis 2 by pressing the key 1 down. In such a configuration, the fulcrum portion that rotatably supports the key 1 on the chassis 2 is configured as shown in FIG. That is, the rear end portion is bent in a direction perpendicular to the main plane 2a of the chassis 2, and the bent piece 2b is bent.
and the same number of square holes 9 as the number of keys 1 are provided in the bent piece 2b. - A protrusion 8 having a locking groove 7 with a groove width corresponding to the thickness of the bent piece 2b of the chassis 2 is provided at the rear end of the Yuken 1, so that the key 1 and the chassis 2 can be connected as shown in FIG. Combine with.

In such a configuration, as shown in FIG. 3, the cross-sectional shape of the locking groove 7 of the key 1 is shaped like an opening, while the square hole 9 provided in the bent piece 2b of the chassis is shaped like a metal mold. It is often formed into a rectangular shape for ease of use, and when the two are combined, a gap larger than the opening will be created in the locking groove (COD). With this configuration, when the key 1 is pressed all the way down, the outside surface 111 of the opening of the key 1 and the bent piece 2b of the chassis 2 rub against each other, causing an abnormal sound and scratching the key 1. There were problems such as powder scattering and the switch circuit 6 becoming defective. As a countermeasure against this problem, a measure has been taken to reduce friction by applying oil between the outside of the opening of the key 1 and the bent piece 2b of the shear 72, but it takes a long time to apply the oil. , and also had drawbacks such as oil flowing out and spoiling the aesthetic appearance.

Alternatively, the shape of the rectangular hole 9 provided in the bent piece 2b may be made into a trapezoid shape with a small top and a large bottom, but this has the drawback of increasing the cost of the mold.

(Object of the Invention) An object of the present invention is to provide a keyboard arrangement for a keyboard instrument that eliminates the conventional drawbacks, prevents abnormal sounds from being generated when keys are operated, and can be manufactured at a low cost.

(Structure of the Invention) The keyboard device of the keyboard instrument of the present invention has a cross section of the locking groove at the rear end of the key, the width of the locking groove being larger than the width of the outside of the opening of the key 17, and the bent piece of the chassis. When the key is locked in the square hole formed in the hole, by making the gap at the opening larger than the locking groove, it prevents the opening from rubbing against the side wall of the square hole when the key is operated, and prevents abnormalities. This is an attempt to prevent the generation of sound.

(Description of Embodiment) An embodiment of the present invention will be described based on FIGS. 4 and 5.

FIG. 4 is a rear view of the narrow part of the keyboard device of the electronic musical instrument. In the figure, the protrusion 8' at the rear end of the key 1 has a width dimension A of the engagement groove.
'> is formed according to the relationship of opening outer dimension B'. When this is inserted into the square hole 9 provided in the chassis bending piece 2b, the gap between the protruding part 8' and the shear bending piece 2b is the relationship of the locking groove gap C/(opening gap D'). C, the key 1 moves sideways and the gap in the locking groove becomes O.
Even if it is, there will be a gap of (B-C/) at the opening, and even if key 1 is pressed down, key 1 and chassis 2 will rub against each other and make abnormal noises, as in the conventional case. occur or
No abrasion powder is produced, and the key 1 itself can be manufactured by simply setting the parting line 10 as shown in the thick line 11 when making the mold, as shown in FIG. 5. (Advantages of the invention) ) According to the present invention, there is no need for additional work such as applying oil between the outside of the opening of the key of the keyboard device and the bent piece of the chassis, and there is no need for a mold for turning a square window into a trapezoidal window. It is not difficult to create and has the effect of eliminating abnormal noises that occur when operating keys.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a keyboard device of a conventional electronic musical instrument, FIG. 2 is a perspective view of the main parts, FIG. 3 is a rear view of the main parts, and FIG. 4 is a keyboard of a keyboard instrument according to an embodiment of the present invention. FIG. 5 is a rear view of the main parts of the apparatus, and FIG. 5 is a perspective view of the main parts. 1.r.white key or black key, 2..chassis, 2a..
・Main plane of the chassis, 2b ・Folded piece of the chassis, 3.
...Spring, 4...S)-+'', 5...Actuator, 6...Switch circuit, 7...Latching groove, 8,8
'...Protrusion, 9...Square hole, 10...Parting line, 11...Thick line, A, A'...Width of locking groove, B, B'...Opening Outer width, c, c'...locking groove gap, D, D'...opening gap. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 A'〉B'

Claims (1)

[Claims] a main plane; a chassis having a six-digit bent piece bent in a direction perpendicular to the main plane at the rear end of the main plane; and a substantially U-shaped cross section with an opening at the bottom; A key having a locking groove that fits into the chassis at the upper rear end, and characterized in that in the U-shaped cross section of the key, the width on the outside of the opening is smaller than the width of the locking groove. A keyboard device for a keyboard instrument.