JPS5855610Y2 - variable resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable resistor, and more particularly to an improvement in a variable resistor that can be operated by a motor or by hand and is suitable for remote control.

Hereinafter, the present invention will be explained in detail with reference to the drawings. Figure 1 is an exploded perspective view of each part constituting the present invention.
are mounting plates or frames arranged opposite to each other, and a rotary variable resistor 3 having an operating shaft 3a is mounted on one mounting plate 1, and a driving gear is connected to the tip of the shaft 3a via a spring 7. 5 is loosely fitted, and a drive body 6, which will be described later, is attached to the back surface of the drive body.

The variable resistor 3 is a substrate 3 that closes both ends of the cylindrical case 3b.
One board 3C is provided with a horseshoe-shaped resistor (not shown), and the other board 3d is provided with a horseshoe-shaped resistor (not shown).
In particular, as shown in FIG. 5, the first and second conductors 3e and 3 forming the switch section have open ends on opposite sides.
f and a common conductor 3g are provided, and a common conductor 3g is provided.
g is connected to the child terminal of the power supply.

3h and 3i are rectifying elements, with the rectifying directions opposite to each other and one electrode connected to the first and second electrodes, respectively. The electrodes are connected to the second conductors 3e and 3f, and the other electrodes are short-circuited to each other and connected to the motor 4.

3j is a movable contact attached to the operating shaft 3a, and the movable contact 3j is in sliding contact with the conductors 3e, 3f, and 3g.

Reference numeral 2 denotes a frame body to which the motor 4 is attached, and this frame body is composed of a side plate 2a having a hole 2f in the center through which the worm gear 4a of the motor 4 is inserted, and an upper plate 2b and a lower plate 2d extending vertically from the side plate 2a. A support part 2C bent at a substantially right angle is provided at the end of the top plate 2b, and a notch engagement recess 2C' is formed in this support part, and a notch 2d' is also formed in the bottom plate 2d. It is a provision.

8 and 10 are columns having heads 8a and 10a, and these columns 8 and 10 are inserted into holes 2g and 2h of the frame body 2, respectively.
Further, the tubular spacers 9 and 11 are inserted, and the tips thereof are inserted into the corresponding holes 1a and 1b of the mounting plate 1, and then fixed by tightening or the like to couple the frame 2 and the mounting plate 1.

Numeral 15 is a screw that is inserted into the upper and lower small holes 2j of the frame 2 and screwed into the corresponding small hole 4b of the motor to fix the motor 4 to the frame 2.

12 is a first gear body, one end 12C is engaged with a notch 2d' in the lower plate 2d of the frame 2, and the other end 12d
is inserted into the small hole 2e of the upper plate 2b of the frame, and the gear 12
b is rotatably supported between the upper and lower plates 2b and 2d of the frame body in a state where it meshes with the worm gear 4a of the motor 4.

Reference numeral 13 designates 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 supported by the spacer 11. As shown in FIG. 4, one end 14a of the wound spring 14 constantly presses the spring 14 inward to prevent it from coming out.

The small hole 1d of the mounting plate 1 is for locking the other end of the spring 14, and this spring locking hole may be provided, for example, in the support portion 2C of the frame.

In this state, the gear 13a of the second gear body 13 meshes with the gear 12a of the first gear body 12, and the gear 13b meshes with the drive gear 5 mounted on the shaft of the variable resistor 3.

FIG. 2 shows a state in which the above-mentioned parts are assembled, and in this figure, the top plate 2b of the frame body 2 is removed for convenience of explanation.

FIG. 3 shows an enlarged view of the mechanism of the drive gear 5, which is one of the features of the present invention, and the disk-shaped drive body 6, which is made of synthetic resin or the like and is located in the recess 5a on the back side and frictionally engages with the drive gear 5. As shown in FIG.
A speed nut 15 is press-fitted into the tip 3b of the shaft, and the drive body 6 is rotatably mounted on the shaft.

Further, a coil spring 7 is stretched between the drive gear 5 and the mounting plate 1 to achieve frictional engagement between the drive body 6 and the drive gear 5.

In addition, 16 is an E-ring for spring fixing. Further, a washer such as felt may be interposed between the drive body 6 and the drive gear 5 if necessary.

FIG. 4 shows the end portion 1 of the second gear body 13 described above.
3 C, and as can be seen in this figure, one end 14a of the spring 14 wound around the spacer 11 is inserted into the end 13 which is fitted into the notch recess 2C' of the support part 2C of the frame 2. Since the gear C is always pressed inward, even if the gear body 13 is eccentric or the pitch between the gear 13b and the driving gear 5 is slightly off, the depth range of the recess 2C' will be maintained. The gear 13b can follow the gear 5 within the
When the gear 5 stops, the gear 13b escapes to the outside of the recess 2C' and slips, thereby preventing overload when the motor is stopped.

Next, to explain the operation of the present invention, when the motor 4 is rotated, this rotation causes the worm gear 4a and the first gear body 1 to rotate.
2. The signal is transmitted to the second gear body 13, and the drive gear 5 is rotated by the gear 13b.

Therefore, the drive body 6 that is frictionally engaged with this rotates at the same time.

Since the driving body 6 is fixed on the operating shaft 3a of the variable resistor 3, it rotates the operating shaft 3a and is attached to the slider receiver (not shown) of the variable resistor 3 mounted on the operating shaft 3a. The resistance value is varied by a fixed slider.

Of course, it goes without saying that the frictional resistance between the driving gear 5 and the driving body 6 needs to be set larger than the rotational torque of the variable resistor.

The above is a driving method using a motor, but in the case of manual operation, it is sufficient to simply rotate the operating shaft 3a of the variable resistor 3. In this case, the driving body 6 also rotates together with the operating shaft 3a, but if the motor 4 is Due to the operation, the drive gear 5 does not rotate and slips between the drive gear 5 and the driver 6.

Therefore, the torque of the variable resistor and the frictional resistance between the driving gear 5 and the driving body 6 are added to the hand, so that a suitable feeling of rotational torque can be obtained.

In addition, by incorporating a switch section in the variable resistor and interlocking it with the variable resistor as shown in Fig. 5, it is possible to reduce the size of the variable resistor, and the slider of the variable resistor can be positioned at the sliding end position of the resistor path. When the movable contact 3j of the switch is also located as shown in the figure, it is disconnected from the second conductor 3f, the power supply circuit to the motor is cut off, the motor is automatically stopped, and the variable resistor is also not activated. The motor will stop, but if you reverse the polarity of the power supply, the motor will rotate in the opposite direction again, allowing you to adjust the variable resistor as you like.

As described above, in the present invention, the driving gear 5 is loosely fitted onto the operating shaft 3a of the variable resistor 3, and the driving body 6 fixed to the operating shaft 3a is frictionally engaged with the driving gear 5, so that they can slip. Therefore, the operation by the motor 4 can also be performed manually, making it suitable for remote control. In addition, if too much load is applied to the motor 4 or the variable resistor 3, the drive body 6 and the drive gear 5
Since the gear body slips between the frame and the mounting plate, the variable resistor and motor are separately attached to the frame and the mounting plate, so the variable resistor and motor can be easily removed during assembly. Another advantage is that the block body consisting of the drive body and drive gear and the block body consisting of the motor and gear body can be assembled separately, resulting in good workability.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention, with Fig. 1 being an exploded perspective view of the components, Fig. 2 being a partially cutaway top view of the main parts, and Figs. 3 and 4 being enlarged explanatory views of the main parts. , FIG. 5 is a plan view of the substrate 3d of the switch section. 1... Mounting plate, 2... Frame, 3...
...Variable resistor, 3a... Operating axis, 4...
...Motor, 5...Drive gear, 6...
...Driver, 7...Spring, 12.13...
...Gear body.

Claims (1)

[Scope of utility model registration request] A variable resistor in which a variable resistor is attached to one of a frame body and a mounting plate, and a motor is attached to the other, and the variable resistor can be operated by rotation of the motor via a gear body serving as an intermediate rotation transmission body. a variable resistor comprising a substrate formed with a body and a substrate formed with a switch portion for driving a motor; a driving body fixed to an operating shaft of the variable resistor; and a driving body loosely fitted to the operating shaft. A variable resistor comprising: a drive gear meshed with the gear body and pressed against the drive body by a spring to be frictionally engaged with the drive body.