JPS6213116Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rotation holding structure for an expression pedal used when adjusting the sound volume of an electronic musical instrument.

An expression pedal is provided in an electronic musical instrument to control the volume of sound produced. This expression pedal uses a foot pedal to move a foot stool and rotate a rotary variable resistor, controlling the output volume as the resistance value of the variable resistor changes. The output volume is set accordingly.

However, in the expression pedal conventionally used in electronic musical instruments, a pivot is inserted into a footstool and a mount to which it is attached, and this pivot is brought into elastic contact with a leaf spring to move the footstool to any rotational position. It is held fixed.

However, when fixing the pivot using a leaf spring, a load is always applied to the leaf spring, so
It had the disadvantage of poor durability, and the leaf spring could bend if the expression pedal was used for a long period of time. Furthermore, when attaching this leaf spring to a mounting base, a load must be constantly applied to fix it, making the attachment work extremely difficult.

This idea was made in view of the above points, and involves inserting a friction member between the first connecting plate raised from the footstool and the second connecting plate raised from the mounting base. It is an object of the present invention to provide a rotation holding structure for an expression pedal, in which the footrest is fixedly held at an arbitrary rotational position by fitting and inserting the footrest through a pivot.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view of this embodiment, and 1 in the figure.
indicates a footstool, and the surface of the chassis 2 is covered with a rubber body 3.
It is coated with Protrusions 4 and 5 are provided at the front and rear ends of the chassis 2, and are adapted to come into contact with stoppers 8 and 9 formed of a rubber body 7 that covers the entire upper surface of the mounting base 6. .

Further, a vertically movable crank 10 and a first connecting plate, that is, a connecting plate 12 for fixing the footrest 1 at a desired angle by means of a pivot 11 are formed in the center of the foot pedal chassis 2 to protrude downward. Chassis 1
3 is provided.

The mounting base 6 includes a main chassis 14 and a chassis 1 provided on the main chassis 14.
5, 16, 17a, 17b (see FIG. 2 for 17b), etc. are covered with a rubber body 7. A hole 7a is provided in the center of the rubber body 7, and at that position, the chassis 16, 17a, 17b
side plate 18 integrally formed with the second connecting plate, that is, bearings 19a, 19b (bearings 19a, 19b
There is one each on the left and right. ) protrudes upward. A rotary variable resistor 20 is provided on this side plate 18 (on the back side in FIG. 1), and its rotating shaft 20a is fixed to a rotating crank 21 connected to the vertically moving crank 10. has been done. Further, the pivot shaft 11 is inserted and fixed in the bearings 19a, 19b together with the connecting plate 12 of the footrest 1. In addition, these chassis 16, 17a, 17b
The rubber body 7 is supported upwardly at both the tip and rear ends of the hole 7a.

The chassis 15 includes the chassis 16 and 17.
Similarly, it is formed to protrude upward and fixes the name plate 22. On this nameplate 22, there is a knob 2 of the rotary variable resistor 23 provided on the back surface for fine adjustment of the rotary variable resistor 20.
3a is provided. Note that a predetermined portion of the nameplate 22 here is not covered with the rubber body 7.

FIG. 2 shows the connecting plate 12 and bearings 19a, 1.
9b is partially inserted and inserted with the pivot 11. Note that the same parts as in FIG. 1 are given the same reference numerals and their explanations will be omitted.

The pivot shaft 11 is threaded at both ends and is fixed with a nut 24 and a washer 25. code 2
As shown in FIG. 3, 6 is an annular friction member with a flat surface, made of a material with a high friction coefficient such as rubber or leather, and connected to the connecting plate 12 and the bearing 19.
It is inserted between a and 19b and applies a load to the pivot shaft 11 in the axial direction.

Next, the case where the expression pedal of this embodiment is operated by foot will be explained. Fig. 1 shows a state in which the pedal is fully pressed in the direction of arrow B, and from this state it is possible to rotate in the direction of arrow A and change the state until the protrusion 5 contacts the stopper 9 (the reverse is also possible). ), and can be fixed at any angle between them. At that time, depending on the vertical movement of the foot stool 1,
The vertically moving crank 10 moves up and down, and the movement is converted by the rotating crank 21 into a movement that rotates the rotating shaft of the rotary variable resistor 20.

In that case, the connecting plate 12 and the bearings 19a, 1
9b, a load is applied in the axial direction of the pivot shaft 11 by the friction member 26, and if the footrest 1 is pressed with a force greater than this load, it can be rotated by a desired angle, and the pressing force is Once released, it will remain fixed in that position.

In the above embodiment, the connecting plate 12 and the bearings 19a, 19b are provided one each on the left and right sides of the expression pedal, and the connecting plate 12 and the bearing 1
A friction member 26 is provided between 9a and 19b, but if necessary, a friction member 26 may be provided on either the left or right side.
The above-mentioned rotation holding structure may be provided, and the shape and number of the friction members 26 may vary depending on the connecting plate 1.
2 and the sizes of the bearings 19a, 19b or the number of them installed. Further, in the above embodiment, the expression pedal is a stand-alone expression pedal, but the present invention can also be applied to a pedal that is incorporated into the main body of a musical instrument.

As explained in detail above, this invention involves inserting a friction member between the first connecting plate raised from the footstool and the second connecting plate raised from the mounting base, and connecting them to the pivot. Since the footrest is fixed and held at any rotational position by inserting it into the shaft, the load applied to the pivot is in the axial direction, and the friction surface is large, resulting in good durability and ease of assembly. Even in this case, it is sufficient to simply insert the friction member between the first and second connecting plates, which is extremely easy.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view of the embodiment, FIG. 2 is a longitudinal sectional view of the main part of FIG. 1, and FIG. 3 is a diagram showing a friction member. 1... Footstool, 6... Mounting base, 11... Pivot, 12... Connection plate, 19a, 19b... Bearing, 20... Rotating variable resistor, 24... Nut, 25... Washer, 26 ...Friction member.

Claims (1)

[Scope of utility model registration request] In an expression pedal that changes the resistance value of a rotary variable resistor according to the rotation angle of a footrest that is moved up and down about a pivot by foot operation, a first pedal raised from the footrest is used.
a second connecting plate erected from a mounting base connected to the foot stool by the pivot;
a friction member inserted between the first and second connection plates, the pivot is inserted into the first connection plate, the friction member, and the second connection plate, and the pivot is rotated as desired. An expression pedal rotation holding structure that holds the expression pedal in a fixed position.