JPH04112501A - Motor-driven variable resistance - Google Patents

Abstract

PURPOSE:To arrange a motor shaft and the operating shaft of a variable resistance on the same line by using the following: a worm gear mounted on the motor shaft, a helical gear, a feed gear, and protrusions mounted on the operating shaft of the variable resistance. CONSTITUTION:When a motor shaft 32a is turned, a worm gear 33 which has been fixed and attached to it is turned. Thereby, a driving gear 34 provided with a helical gear 34b which engages with the worm gear 33 is decelerated and turned. At this time, protrusions 35a installed at a driving plate 35 are fed by one pitch per turn of a spiral feed gear 34 by means of the spiral gear 34a, turns the operating shaft 31a of a variable resistance, and changes a resistance value. Consequently, since the motor shaft and the operating shaft of the variable resistance are arranged on the same line, a space can be saved and the number of components can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a motor-driven variable resistor suitable for motor-driven and manually operable remote control mainly used in audio equipment.

Conventional technology The conventional technology will be explained with reference to FIGS. 5 to 8.

FIG. 5 is an exploded perspective view of the motor-driven variable resistor.
FIG. 6 is a side view of the same, FIG. 7 is a partial cross-sectional view illustrating a friction drive section which is the same essential part, and FIG. 8 is an explanatory diagram illustrating the drive section which is the same essential part.

According to the figure, reference numeral 1 denotes a mounting plate disposed facing the frame 2, and a rotary variable resistor 3 having an operating shaft 3a is mounted on this mounting plate 1, and the tip of the operating shaft 3a is A drive gear 5 is loosely fitted through a coil spring 7, and a drive body 6, which will be described later, is attached to the back surface of the drive gear 5. The frame 2 also has a side plate 2a provided with a hole 2f in the center for inserting the worm gear 4a of the motor 4, and a top plate 2b extending perpendicularly from the side plate 2a.
A supporting portion 2c is provided at the end of the upper surface plate 2b and is bent at a substantially right angle, and a notch engagement recess 2c' is formed in this supporting portion. Similarly, a notch 2d' is provided in 8. The columns 8 and 10 are respectively inserted into the holes 2g and 2h of the frame body 2, and the tubular spacers 9 and 11 are inserted, respectively, and their tips are connected to the mounting plate lO.
After being inserted into the corresponding holes 1a and 1b, the frame body 2 and the mounting plate 1 are fixed by tightening or the like. 15
Screws b are inserted into the upper and lower small holes 2j of the frame 2 and are screwed into the corresponding small holes 4b of the motor to fix the motor 4 to the frame 2. 12 is a first gear body with one end 12c
is engaged with the notch 2d' of the lower plate 2d of the frame 2, and the other end 12d is inserted into the small hole 2L of the upper plate 2b of the frame, and the gear 12b is engaged with the worm gear 4a of the motor 4. It is rotatably supported between the upper and lower plates 2b and 2d of the body. 13 is a second gear body, one end 13d of which is supported in the small hole 21 of the frame 2, the other end 13c is supported in a notched recess 2c' provided in the support part 2C of the frame, and is wound around the spacer 11. As shown in FIG. 8, one end of the spring 14 is constantly pressed inward to prevent the spring from coming out. In this state, the gear portion 13a of the second gear body 13 meshes with the gear portion 12a of the first gear body 12, and the gear portion 13b engages with the drive gear 5 attached to the operating shaft 3a of the variable resistor 3. mesh with.

Referring to FIG. 7, details of the mechanism of the drive gear 5 and the disk-shaped drive body 6 made of synthetic resin or the like that is in the recess 5a on the back surface and frictionally engages with the drive gear 5 will be explained. A spacer 6a of the driving body 6 is fitted onto the shaft 3a on the back surface of the mounting plate 1, and a speed nut 28 is press-fitted into the tip 3b of the operating shaft 3, allowing the driving body 6 to rotate. mounted on. Also, drive gear 5 and mounting plate 1
A coil spring 7 is stretched between them to achieve frictional engagement between the drive body 6 and the drive gear 5.

Next, to explain the operation of the motor-driven variable resistor mentioned above,
When the motor 4 rotates, this rotation causes the worm gear 4
a, first gear body 12. This is transmitted to the second gear body 13, and the drive gear 5 is rotated by the gear portion 13b. Therefore, the drive body 6 that is frictionally engaged with this rotates at the same time, and the variable resistor 3
The resistance value of the variable resistor 3 is varied by rotating the operation shaft 3a of the variable resistor 3.

When manually varying the resistance value of the variable resistor, a slip is generated between the drive gear 5 and the drive body 6 by rotating the operating shaft 3a, and the torque of the variable resistor 3 and the drive gear 5. Frictional resistance with the driving body 6 is added, and the resistance value of the variable resistor can be varied while providing a feeling of appropriate rotational torque.

Problems to be Solved by the Invention However, the conventional motor-driven variable resistor described above has a complicated drive section structure, making it difficult to reduce costs, and the motor shaft and variable resistor shaft are arranged on the same axis. This required a large installation space.

The present invention solves these conventional problems,
This reduces the number of parts and places the motor shaft and variable resistor shaft on the same line, saving space.

Means for Solving the Problems In order to solve the above problems, the present invention provides a worm gear attached to a motor shaft and a drive plate having a plurality of protrusions on the circumference attached to an operating section of a variable resistor. It consists of a drive gear that has a helical gear and a spiral feed gear that mesh with each other.

Effect: By arranging the motor shaft and the operating shaft of the variable resistor on the same line, it is possible to save space and reduce the number of parts.

Embodiment A motor-driven variable resistor according to an embodiment of the present invention is shown in FIGS.
This will be explained with reference to FIG. FIG. 1 is an exploded perspective view of a main part of the motor-driven variable resistor of the present invention, FIG. 2 is a perspective view of the same, FIG. 3 is a partial sectional view of the same, and FIG. 4 is a portion for explaining the speed reduction mechanism. It is a perspective view.

In the figure, 32 is a motor, 32a is a motor shaft, and 33 is a worm gear, which is press-fitted and fixed to the motor shaft 32a. Reference numeral 34 denotes a drive gear, which is integrally composed of a helical gear 34b that meshes with the worm gear 33, and a spiral feed gear 34a that meshes with a plurality of protrusions 35a provided on the same circumference of the drive plate 35. It is rotatably held. Further, the case 36 is fixed to the motor 32 and the variable resistor 31.

Further, the drive plate 35 is connected to the slip plate 37 by a speed nut 38. It is slidably held on the operating shaft 31a together with a spring 39. The slip mechanism is the same as that of the prior art, so a description thereof will be omitted.

Next, the first operation will be explained. As the motor shaft 32a rotates, the worm gear 33 fixed thereto rotates. Accordingly, the drive gear 34, which has a helical gear 34b that meshes with the worm gear 33, is decelerated and rotates. At this time, the protrusion 35a provided on the drive plate 35 is fed by the spiral feed gear 34a by one pitch per rotation of the spiral gear 34a, and the variable resistor operating shaft 31a
is rotated to change the resistance value.

In the above embodiment, the spiral feed gear 34a and the protrusion 35a disposed on the same circumference on the drive plate are used. However, it is also possible to use an internal gear and an umbrella-shaped worm gear.

Effects of the Invention As is clear from the above embodiments, the present invention comprises a worm gear mounted on a motor shaft, a helical gear meshing with the worm gear, a helical feed gear integrated with the helical gear, and a helical feed gear. Multiple protrusions are provided on the circumference of the drive plate attached to the operating shaft of the variable resistor that engages with the gear, so that the motor shaft and the operating shaft of the variable resistor are approximately aligned.
It can be placed on a line, making it possible to save space and reduce the number of parts.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the main parts of a motor-driven variable resistor that is an embodiment of the present invention, Fig. 2 is a perspective view of the finished product, Fig. 3 is a partial sectional view of the same, and Fig. 4 is the main parts of the same. FIG. 5 is an exploded perspective view of a conventional motor-driven variable resistor, FIG. 6 is a sectional view of the same, and FIG. 7 is a partial sectional view of the friction drive unit, which is the main part. FIG. 8 is an explanatory diagram illustrating the driving section, which is the main part. 31... Variable resistor, 31a... Operating shaft, 32... Motor, 32a... Motor shaft, 33... Worm gear, 34 ...
... Drive gear, 34a... Spiral feed gear, 34b... Helical gear, 35...
Drive plate, 35a...protrusion. Name of agent: Patent attorney Haruaki Koebi and two others Funeral map

Claims (2)

[Claims] (1) At least a worm gear attached to the motor shaft, a drive plate having a plurality of protrusions on the circumference attached to the operating shaft of the variable resistor, a helical gear that engages with the worm gear, and a helical gear that engages with the plurality of protrusions. A motor-driven variable resistor consisting of a drive gear with a spiral feed gear. (2) A drive having at least a worm gear attached to the motor shaft, an umbrella-shaped worm gear attached to the operating shaft of the variable resistor, a helical gear that meshes with the worm gear, and an internal gear that meshes with the umbrella-shaped worm gear. A motor-driven variable resistor consisting of gears.