JPS5815990Y2 - Keyboard switch in electronic organ - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a keyboard switch in an electronic organ that expands the range of self-cleaning action of the contacts.

Figure 1 shows an example of a switch mechanism that can be pressed on the foot keyboard of an electronic organ.When a key K is operated with the foot, the key descends around a fulcrum member hanging from the front end of the keyboard chassis A. As a result, the actuator a, which passes through the switch frame F in the vertical direction, is moved downward by the action of the suppressing spring S1 installed on the frame, and presses and bends the movable contact 1 mounted in a cantilevered manner within the switch frame F, so that the tip of the movable contact 1 is bent. The contact point 2 is brought into contact with a fixed contact 2 perpendicular to the contact point 2 to prompt the desired sound.

In this case, when actuator a is pressed down, movable contact 1 moves forward from the holding state shown in FIG. When the user stops operating the key in the housing, the actuator a is lifted together with the keyboard by its support spring S2, and the actuator a is restored to the state shown in FIG. 3A again.

At that time, the tip of the movable contact 1 moves above the fixed contact 2 with the arrows x and x.
By sliding back and forth as shown in ', a so-called self-cleaning action is performed that removes dust adhering to the fixed contact 2 and prevents the formation of a harmful film that causes an increase in resistance.

By the way, in the conventional type, the fixed contact 2 is horizontally attached to the side wall of the switch frame F as shown in Fig. 2, so the range of the self-cleaning action described above is limited to the front-back movement of the movable contact tip. Only due to P to Figure 3
The sliding area is extremely narrow, making contact unnecessary.

Therefore, this idea aims to improve this point.
To provide a keyboard switch in which the tip of a movable contact can be moved not only in the front-back direction but also in the lateral direction, thereby widening the range of self-cleaning action for a fixed contact and preventing contact failure.

Figures 4 and 5 show an embodiment of this invention, in which a rod-shaped fixed contact 2 is attached to the side wall Fa of the switch frame F so as to be inclined laterally upward, and is opposed to the tip of the movable contact 1'. It's a shame.

With this structure, when the actuator a presses down the movable contact 1' by operating the key and brings its tip into pressure contact with the fixed contact 2', the fixed contact 1' moves in the direction of the depression. Since the tip of the movable contact 1' is tilted upward from the surface of the fixed contact 2' as shown in FIG. From there, it slides in the direction of arrow Y and assumes the position 1'b.

At the same time, the tip of the movable contact 1' is bent into a flattened state as described above and moves in the X direction of the opening in FIG.

Then, when the pressing force is released, the tip of the movable contact 1' moves in the Y' direction opposite to the above and returns to the original solid line position in FIG. 5A.

Therefore, the tip of the movable contact 1' extends vertically over the fixed contact.
As it moves laterally, its sliding area expands and becomes as shown at P2 in Figure 5.

As described above, according to this invention, when the actuator returns downward, the tip of the movable contact moves not only in the front and back directions but also in the lateral direction on the fixed contact, so the range of its self-cleaning action is greater than that of conventional ones. The cause of contact failure can be eliminated.

In the above example, we explained a button with the fixed contact tilted upward, but a button with the fixed contact tilted downward can have the same effect, and this invention is applicable not only to foot keyboards but also to general keyboards. It can also be applied.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a foot keyboard. FIG. 2 is a front view of a conventional switch mechanism. FIG. 3A and 3C are explanatory diagrams showing the operating state of a conventional switch mechanism. FIG. 4 is a front view of the switch mechanism according to this invention. FIG. 5A is an explanatory view showing its operating state. In the figure, 1 and 1' are movable contacts, 2 and 2' are fixed contacts, F is a switch frame, and a is an actuator.

Claims (1)

[Scope of utility model registration request] A switch frame is constructed by horizontally disposing a rod-shaped fixed contact 2 at the lower end of the movable contact 1, perpendicular to the length direction of the movable contact 1, and making the fixed contact 2 inclined with respect to the vertical movement direction of the movable contact 1. A keyboard switch in an electronic organ that is attached to the side wall of the F.