JPH0719137B2 - Keyboard device manufacturing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a keyboard device for an electronic musical instrument or the like, and particularly to facilitate automating the work of fixing a key stopper that restricts the movement of each key. is there.

2. Description of the Related Art In recent years, efforts have been made to automate the manufacturing and assembly of electronic musical instrument keyboards or to reduce the number of assembly steps, but the key stoppers that limit the movement of each key have a felt cut into a specified size. Was difficult to automate.

An example of the above-described conventional key stopper will be described below with reference to the drawings.

3 and 4 show a conventional key stopper. In FIG. 3, reference numeral 10 is a key stopper made of felt, which is configured to be fixed to the chassis 3 with a double-sided tape or an adhesive.

Problems to be Solved by the Invention However, using a felt as a key stopper has a high shock absorbing effect when the key hits the key stopper, but the length of the felt itself to be manufactured is limited. Therefore, once supplied, it is impossible to realize a long product that can form a key stopper on a considerable number of chassis. Therefore, the key stopper felt 11 is cut to a length corresponding to the length of the chassis 3. Since it is a soft material, it is difficult to automate work processes such as automatic supply and sticking because it is a soft material, and there is a drawback that productivity is poor because it is necessary to rely on manual work.

As a countermeasure against the above-mentioned drawback, as shown in FIG. 4, a method of inserting the chassis 3 into a mold and integrally forming a key stopper 12 and a key guide member 13 for restricting the lateral movement of the key by molding a soft material is also devised. Although it has been
No. 2 gazette), a large mold for insert molding a long chassis is required, and it is not suitable for small-volume production because the mold cost is high, and depending on the type of electronic musical instrument, 37 keys, 44 keys,
If you want to make the number of keys such as 49 keys and 61 keys, you have to prepare molds for that type.

The present invention provides a method for manufacturing a keyboard device for an electronic musical instrument or the like, which does not require a mold and has high productivity.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is to use fibers such as wool and synthetic fibers mixed in an adhesive agent, which are applied to a chassis, dried, and solidified to be used as a key stopper. is there.

Effect The present invention has the above-mentioned configuration, which eliminates the limitation of the length unlike felt and does not need to be treated as a soft member, and the coating length can be adjusted according to the chassis length of the required number of keys. It is easy to automate processes such as coating and automatic drying, requires no mold, and can respond quickly to sudden changes in production models. Also, the stopper is made of fibers that are entangled in the same way as felt, and it is a material that quickly absorbs the impact at the time of collision with the key.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a method for manufacturing a key stopper according to the present invention. In FIG. 1, fibers 9 such as wool and synthetic fibers are mixed in an adhesive 10 and discharged from a nozzle 8 to a predetermined position on the chassis 3. Here, if the adhesive is a hot-melt type, the stopper 4 is formed by leaving it at room temperature, and if a solvent-type adhesive is used, it is put into a drying oven or the like to quickly disperse the solvent and form the stopper 4. You can

The operation of the key stopper configured as described above will be described with reference to FIG.

First, FIG. 2 is a side view of a keyboard device for an electronic musical instrument. A white key and a black key 1 (hereinafter, simply referred to as a key 1) arranged for each pitch are supported by a chassis 3 such that their tips can swing, and are always biased upward by a spring 5. ing. A key stopper 2 is formed integrally with the key 1 below the key 1, and a key stopper 4 provided on the lower surface of the chassis 3 contacts the key stopper 2 to limit the upward movement of the key. Next, when the tip of the key 1 is pushed down, the lower surface of the key 1 and the key stopper 4 provided on the upper surface of the chassis 3 come into contact with each other, and the lowering of the key is restricted.

In addition, an actuator 6 is formed at the bottom of the key 1 at the same time, and a key switch 7 provided at the bottom of the key 1 is opened / closed in accordance with the up / down direction of the key 1.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is easy to automate the forming process, and it is easy to absorb the impact when the formed product collides with the key, and it is possible to form the key stopper without a die. As well as being able to respond to sudden changes in production models.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention, FIG. 2 is a side view of a keyboard device of an electronic musical instrument which is explained by the operation of the key stopper of FIG. 1, and FIG. 3 is a conventional felt key. FIG. 4 is a perspective view of a main part showing a work of attaching a stopper, and FIG. 4 is a perspective view of a main part showing formation of a key stopper by molding using a conventional mold. 1 ... Key, 2 ... Key stopper, 3 ... Chassis, 4
…… Key stopper, 11,12 …… Conventional key stopper.

Claims (1)

[Claims] 1. An adhesive containing fibers such as wool and synthetic fibers is discharged from a nozzle having a predetermined shape to be applied on the surface of a chassis and then solidified, and the adhesive can be rotated on the chassis at each pitch. A method of manufacturing a keyboard device, comprising a key stopper that restricts movements of a plurality of keys that are arranged in the upper part and are biased upward by a spring.