JPH057619Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to the structure of the operating part of a rotary device such as a variable resistor (potentiometer) or a variable capacitor in which the operating part is rotary. In particular, a rotator is attached to the underside of the mount, and the adjustment shaft of the rotor protrudes above the mount through a hole in the mount, while a smaller-diameter one is attached to the bottom of the large-diameter operating section. The present invention relates to an operation section structure for a rotator, in which an adjustment operation body integrally provided with an attachment boss is connected and fixed to an end of the adjustment shaft by the attachment boss.

(Prior art) For rotating machines where almost no load is applied to the adjustment shaft, in order to make fine adjustments accurately,
In addition, to prevent the adjustment shaft from deviating from the predetermined adjustment position due to mounting vibration or the like after adjustment is set, operational resistance may be applied to the adjustment shaft.

For example, as a means for applying operational resistance to the adjustment shaft, a rubber O-ring is attached to the shaft support of the adjustment shaft.

(Problem to be solved by the invention) However, since the above-mentioned conventional configuration generates frictional resistance at a portion with a small radius from the center of rotation, such as the adjustment shaft, it is difficult to obtain the desired resistance torque. Therefore, it was necessary to set a high contact pressure between the adjustment shaft and the O-ring at the friction generating area.

When applying frictional resistance under such a high contact pressure, there is a problem in that the wear of the member progresses in a relatively short period of time at the area where the friction occurs, resulting in a rapid decrease in the frictional resistance.

The present invention aims to provide a rotator operating structure that maintains stable frictional resistance during long-term use, allows fine adjustment operations, and reliably prevents the adjustment shaft from shifting. purpose.

(Means for solving the problem) In order to achieve the above purpose, in this invention,
The rotator is attached to the underside of the mount, and the adjustment shaft of the rotor protrudes above the mount through a hole in the mount, while a smaller-diameter mounting boss is installed at the bottom of the large-diameter operating section. In the operating part structure of a rotator, the operating part structure of a rotator is configured such that an adjusting operating body is integrally provided with an adjusting operating body connected and fixed to an end of the adjusting shaft by the mounting boss, the lower surface of the adjusting operating body and the mounting base. a coil spring that is attached to the mounting boss so as to be located between the coil spring and the coil spring that provides operational resistance to the adjustment operating body during operation; a spacer that is attached to the boss and that allows the adjustment shaft to move in the axial direction with respect to the mounting base, and is attached such that rotation about the same axis is restricted; and a spacer that is attached to the lower end of the coil spring. The structure includes a positioning body provided for positioning.

(Function) According to the above configuration, the frictional resistance generation site is set on the lower surface of the operating part of the adjustment operating body, that is, at a location with a large radius relative to the rotation axis, so that the contact pressure required to obtain the desired resistance torque is becomes small. Therefore, wear at the portion where frictional resistance occurs is extremely low.

In addition, because the distance between the bottom surface of the large-diameter operating part of the operating body and the mounting base is large, it is possible to incorporate a coil spring with a long free length. The change is extremely small, and frictional resistance due to stable elastic force is always obtained.

Furthermore, the spacer, which is attached to the mounting base while restricting rotation about the same axis as the adjustment shaft, blocks the force in the rotational direction of the coil spring and prevents it from reaching the adjustment operation body. In addition, the coil spring is positioned by the positioning body and operates stably, so that the elastic force acts uniformly on the adjustment operating body.

(Example) An example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing the mounting structure of the rotator, and FIG. 2 is an exploded perspective view.

In these figures, numeral 1 is a rotator;
The rotator 1 is attached to the lower surface of a mounting base 2 by screws 3, and the mounting base 2 is attached within an adjustment opening 5 formed in a mounting case 4 with screws 6 and nuts 7. The adjustment shaft 8 of the rotator 1 protrudes upward from the circular hole 9 of the mounting base 2, and an adjustment knob 10 as an adjustment operation body is fitted into the protrusion, and is fixed to the adjustment shaft 8 with a fixing screw 11. attached.

The adjustment knob 10 is configured by integrally forming a large-diameter operating portion 13 with a group of 12 recesses for fingertip hooking on the upper surface, and a small-diameter mounting boss 14 that is externally fitted onto the adjustment shaft 8. The upper surface of the operating section 13 is exposed to the adjustment opening 5.

Then, the operation part 13 of the adjustment knob 10 and the mounting base 2
A frictional resistance imparting mechanism 15 is incorporated between the adjustment knob 10 to enable fine adjustment and to prevent the adjustment shaft 8 from shifting.

This mechanism 15 includes a friction plate 16 as a spacer that is fitted onto the mounting boss 14 and comes into contact with the lower surface of the operating section 13, and a friction plate 16 that is attached to surround the mounting boss 14 and operates the friction plate 16 at the upper end. A coil spring 17 that presses against the lower surface of the portion 13, and a pair of engagement pins 20, 20 for preventing the friction plate from turning, which are screwed and fixed to the mounting base 2 and engage into the engagement hole 18 and notch 19 of the friction plate 16. and a spring receiving washer 21 as a positioning body which is fitted onto the adjustment shaft 8 and receives the lower end of the coil spring 17.

With the above configuration, the lower surface of the operating section 13 is pressed from below by the friction surface 16a formed in a raised manner at the center of the friction plate 16, and the frictional resistance generated at that portion causes the adjustment shaft 8 to rotate appropriately. resistance will be provided. As described above, since the rotational resistance to the adjustment shaft 8 is obtained from the lower surface of the operating portion 13 having a large radius relative to the rotation axis, the contact pressure required to obtain the desired resistance torque can be reduced.

(Effects of the invention) As explained above, according to the invention, since the structure is such that a coil spring provides frictional resistance on the lower surface of the large-diameter operating part provided on the adjustment operating body, it is possible to obtain frictional resistance to obtain the desired resistance torque. The resistance is significantly smaller than before, and the contact pressure at the frictional resistance generation site is reduced, reducing wear. Furthermore, the large space between the large-diameter operating part and the mounting base allows for free length. Because it is possible to incorporate a large coil spring, there is almost no fluctuation in the spring load due to wear at the frictional resistance generating part, and as a result, the desired frictional resistance can be stably maintained over a long period of time, and the adjustment axis can be adjusted without any deviation. It has become possible to reliably and effectively perform the blocking function.

In addition, the stabilization of the operating resistance of the adjustment operating body also stabilizes the feeling of adjustment, making it easier to make fine adjustments.

Furthermore, the spacer, which is attached to the mounting base while restricting rotation around the same axis as the adjustment shaft, prevents the adjustment operating body from returning, which prevents settings from going awry and allows for finer adjustments. In addition, since the coil spring operates stably due to the positioning body, its elastic force acts uniformly on the adjustment operation body, and the adjustment operation body always rotates smoothly, resulting in excellent operability. It also demonstrates.

[Brief explanation of the drawing]

Figures 1 and 2 relate to embodiments of the present invention;
The figure is a sectional view showing the mounting structure of the rotator, and FIG. 2 is an exploded perspective view. 1...Rotator, 2...Mounting base, 8...Adjustment shaft,
10... Adjustment knob (adjustment operating body), 13... Operating unit, 14... Mounting boss, 17... Coil spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A rotator is attached to the lower surface of the mount, and the adjustment shaft of the rotor is protruded above the mount through a hole in the mount, while the lower part of the large-diameter operating section An operating part structure of a rotator having a structure in which an adjusting operating body integrally provided with a smaller diameter mounting boss is connected and fixed to an end of the adjusting shaft by the mounting boss, a coil spring attached to the mounting boss so as to be located between the lower surface of the operating body and the mounting base, and applying operational resistance to the adjusting operating body during operation; It is attached to the boss so as to be in contact with the upper end of the coil spring, and is attached in a state where the adjustment shaft is allowed to move in the axial direction with respect to the mounting base, and rotation around the same axis is restricted. An operating section structure for a rotator, comprising: a spacer; a positioning body provided to position the lower end of the coil spring;