JPH08236317A - Motor driven sliding type variable resistor - Google Patents

Abstract

PURPOSE: To provide a motor driven sliding type variable resistor having a driven pulley easily supported with a frame. CONSTITUTION: A first and a second support plate 17 and 16 are disposed face to face on a frame, elongated holes 17a and coupling hole 16a are formed face to face through the plates 17 and 16, and a groove 20a is formed into the top face of a support shaft 20 inserted into an axial hole of a drive pulley 10. This groove 20a allows the upper and lower ends of the shaft 20 to slide into the interiors of the holes 17a and 16a, utilizing the tension of the belt 11 when inserted into the hole 17a so as to hold the plate 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-driven slide type variable resistor, and more particularly to a support structure for pivotally supporting a driven pulley of a belt-stretched pulley on a frame.

[0002]

2. Description of the Related Art A motor-driven slide type variable resistor has a resistance value which can be adjusted by both driving and manually operating a motor. The rotation of the motor is wound between a driving pulley and a driven pulley. It is adapted to be transmitted to the movable body of the variable resistor via the belt. Out of each pulley
The drive pulley can be directly fixed to the rotation shaft of the motor, but the driven pulley needs to be rotatably supported by the frame. As a structure for supporting such a driven pulley, it is described in Japanese Utility Model Publication No. 4-77202. As described above, the driven shaft of the driven pulley is caulked and fixed to the frame.

[0003]

However, when the driven shaft of the driven pulley is caulked and fixed to the frame as in the above-described conventional example, the shaft must be plastically deformed by using a caulking jig. Assembling workability is very poor and a large pressing force is required, so that there is a problem that equipment becomes large and total cost rises.

The present invention has been made in view of the circumstances of the prior art as described above, and an object thereof is to provide a motor-driven slide type variable resistor capable of easily supporting a driven pulley with respect to a frame. is there.

[0005]

In order to achieve the above object, the present invention provides a drive pulley rotated by a motor,
A driven pulley rotatably supported by a frame, a belt stretched between the drive pulley and the driven pulley, a movable body having a slider piece fixed to the belt, and a slider piece. In a motor-driven slide type variable resistor provided with a resistance substrate installed opposite to each other, a first receiving plate having an elongated hole and a second receiving plate having an engaging hole are installed to face each other in the frame, and the driven plate is driven. Inserting a concave groove formed on one end side of the support shaft of the pulley into the elongated hole so as to hold the first receiving plate, and inserting the other end side of the support shaft into the engagement hole, It has the most main feature. In the above configuration,
It is also possible to extend the engaging hole of the second receiving plate in the same direction as the elongated hole of the first receiving plate and to make the engaging hole and the elongated hole face each other.

[0006]

Operation: After inserting the concave groove formed on one end side of the support shaft into the elongated hole of the first receiving plate and inserting the other end side of the support shaft into the engaging hole of the second receiving plate, drive When the belt is stretched between the pulley and the driven pulley, the driven pulley is pulled toward the drive pulley by the tension of the belt, and the support shaft of the driven pulley is locked at the ends of the elongated hole and the engaging hole. At that time, the groove of the support shaft is inserted into the elongated hole so as to hold the first receiving plate, and is urged in the inner direction of the elongated hole by the tension of the belt, so that the support shaft falls out of the elongated hole. There is no such thing. In addition, when the engaging hole of the second receiving plate is extended in the same direction as the elongated hole of the first receiving plate and the engaging hole and the elongated hole are opposed to each other, the support shaft is supported by the first and second receiving plates. It can slide from the side of the plate to the inside of the long hole and the engaging hole, and the assembly work becomes easier.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an entire configuration of a motor drive slide type variable resistor according to an embodiment of the present invention, FIG. 2 is a perspective view of a motor drive unit, and FIG. 3 is an exploded perspective view showing a drive pulley support structure. 4, FIG. 4 is an explanatory view showing the positional relationship between the drive pulley and the guide member, FIG. 5 is a sectional view showing the mounting state of the guide member, FIG. 6 is an exploded perspective view showing the support structure of the driven pulley, and FIG. FIG. 8 is a sectional view showing a mounted state, FIG. 8 is an exploded perspective view of a movable body, FIG. 9 is a side view of a lever, and FIG.
0 is a plan view of the slider receiver, FIG. 11 is a rear view of the slider receiver, FIG. 12 is a plan view showing a state in which the movable body is being attached to the belt, and FIG. 13 is taken along line AA of FIG. FIG. 14 is a cross-sectional view, FIG. 14 is a plan view showing a state where the movable body is attached to the belt, and FIG. 15 is a cross-sectional view taken along the line BB of FIG.

The motor drive slide type variable resistor according to the present embodiment comprises a motor drive unit 1 shown in FIG. 2, a pair of covers 2 for covering the front and rear surfaces and the bottom surface of the motor drive unit 1, and the motor drive unit 1. Is roughly configured by a pair of holders 3 that cover both left and right side surfaces of the motor drive unit, a blind plate 4 that covers the upper surface of the motor drive unit 1, and a resistance substrate 5 that is installed opposite to the motor drive unit 1. Resistors and current collectors (not shown) are formed on the surface of the resistance substrate 5 so as to be in sliding contact with the respective slider pieces, which will be described later, and the positioning holes 5a are formed on both side edges of the resistance substrate 5. Has been drilled. On the other hand, a pair of positioning grooves 2a extending in the longitudinal direction is formed on the inner surface of the cover 2, and the resistance substrate 5 is inserted between these positioning grooves 2a.

As shown in FIG. 2, the motor drive unit 1 includes a metal frame 6, a motor 7 fixed to one end of the frame 6, and a drive pulley 8 fixed to a rotation shaft of the motor 7. A guide member 9 surrounding the drive pulley 8, a driven pulley 10 pivotally supported at the other end of the frame 6, and a belt 11 stretched relatively loosely between the drive pulley 8 and the driven pulley 10. The frame 6 is provided with a pair of guide shafts 12 and 13 bridged between both ends, and a movable body 14 which can reciprocate along the guide shafts 12 and 13, and each of these members undergoes an assembly process described later. It is unitized.

The frame 6 has a positioning protrusion 15a.
With a pair of leg pieces 15, a second receiving plate 16 bent at a right angle from the upper end of the left side leg piece 15 in the figure, and a first receiving plate facing the second receiving plate 16 at a predetermined interval. 17,
A support plate 18 that is bent substantially at a right angle from the upper end of the leg piece 15 on the right side in the figure, a pair of upright pieces 19 that are bent at a right angle from the first receiving plate 17 and the support plate 18, and the like are formed. It is pressed from a plate. Grooves 15b and 19a are formed in the leg piece 15 and the standing piece 19, respectively, and both guide shafts 12 and 13 are fixed to the frame 6 by caulking the open ends of these groove portions 15b and 19a. In addition, each of the positioning protrusions 1
5a engages with each positioning hole 5a of the resistance board 5, and by restricting the resistance board 5 in the three-dimensional direction by the positioning groove 2a of the cover 2 and the positioning protrusion 15a of the leg piece 5 in this way. The resistance substrate 5 is fixed to the frame 6 without using screws or caulking.

As shown in FIGS. 3 to 5, the frame 6
The support plate 18 has a circular through hole 18a and a rectangular restricting hole 18b, and an upright piece 19 on the right side of the drawing has a locking hole 19b. The motor 7 is screwed to the lower surface of the support plate 18, and the rotation shaft 7a of the motor 7 is inserted into the through hole 18a and protrudes above the support plate 18. The support plate 18 is bent so as to form an acute angle with respect to the leg piece 15, and as a result,
The rotating shaft 7a of the motor 7 attached to the support plate 18 is inclined outward by a predetermined angle with respect to a line orthogonal to the guide shafts 12 and 13 (in the case of this embodiment, the inclination angle is 1 ° 30. ′). On the other hand, a gear portion 8a is formed on the outer peripheral surface of the drive pulley 8 and a flange portion 8b is formed at the lower end of the gear portion 8a. The drive pulley 8 is press-fitted onto the rotary shaft 7a of the motor 7.・ It is fixed. here,
The shaft hole of the drive pulley 8 and the rotary shaft 7a are each formed to have a D-shaped cross section, and the D-shape ensures that the rotation of the rotary shaft 7a is transmitted to the drive pulley 8. As described above, the drive pulley 8 has a belt 11
The tooth portion 11a formed on the inner peripheral surface of the belt 11 meshes with the gear portion 8a of the drive pulley 8. At that time, the rotary shaft 7a of the motor 7 is inclined so as to be slightly outward with respect to the line orthogonal to the guide shafts 12 and 13, and the drive pulley 8 is driven by the drive of the motor 7.
When the belt rotates, the belt 11 wound around the drive pulley 8
Since the flange portion 8b always has a downward force, the belt 11 can be reliably prevented from falling off by forming the flange portion 8b only on the lower end of the drive pulley 8.

The guide member 9 is formed in a bag shape having an open lower end, and a hole 9a is formed in the upper surface thereof. Further, a first snap claw 9b extending downward is formed on one of the side walls of the guide member 9 facing each other, and a second snap claw 9c extending upward is formed on the other side thereof, and the first snap claw 9b is formed. A hanging piece 9d, which is slightly shorter than the first snap claw 9b, is formed on the inside of the. The width dimension of the first snap claw 9b is set to be slightly smaller than the restriction hole 18b of the support plate 18, and similarly, the second snap claw 9b
The width dimension of the snap claw 9c is the locking hole 1 of the upright piece 19.
It is set slightly smaller than 9b. Further, the guide member 9 is formed with a pair of restricting portions 9e facing each other through the first snap claw 9b.
The inner surfaces facing each other are curved.

The guide member 9 thus constructed is put on the drive pulley 8 and the belt 11 wound around the drive pulley 8 to lock the first snap claw 9b in the restriction hole 18b, and the second snap. By snapping the claws 9c into the locking holes 19b respectively, as shown in FIG.
The rotary shaft 7a is rotatably mounted on the support plate 18 of the frame 6 with the rotary shaft 7a protruding therefrom. That is, the first
And the second snap claws 9b and 9c are respectively formed in the restriction hole 1.
Since the guide member 9 can be moved by a small amount in the width direction with respect to 8b and the locking hole 19b, the guide member 9 can rotate about the hole 9a by a small angle. Further, the belt 11 passes through between the first snap claw 9b and both regulating portions 9e and is stretched around the driven pulley 10, but is in contact with both regulating portions 9e near the outlet of the guide member 9. Belt 1 at the regulation section 9e
1 is pressed inward, so that the tooth portion 1 of the belt 11
The gear 1a is reliably meshed with the gear portion 8a of the drive pulley 8. At that time, since the guide member 9 is rotatably mounted on the support plate 18, if the belt 11 is strongly pressed against the one restricting portion 9e due to eccentricity of the drive pulley 8 or deformation of the belt 11, for example. The guide member 9 rotates following it, so that the contact state between the belt 11 and the both restricting portions 9e is always kept good. Furthermore, FIG.
As shown in FIG. 3, a gap is secured between the winding portion of the belt 11 meshing with the drive pulley 8 and the inner surface of the guide member 9 so as to keep them in non-contact with each other. It is set to be smaller (a <b) than the toothbrush dimension b of the 11 tooth portion 11a.

As shown in FIG. 6, the first part of the frame 6
The receiving plate 17 has a long hole 17a extending in the direction of the support plate 18, and the second receiving plate 16 has an elongated engaging hole 16a.
a is formed so as to face the long hole 17a. On the other hand, a gear portion 10a is formed on the outer peripheral surface of the driven pulley 10, and a spindle 20 having a groove 20a on the upper peripheral surface is inserted into the shaft hole 10b of the driven pulley 10. As shown in FIG. 7, the support shaft 20 is inserted into the slot 17a so that the concave groove 20a holds the first receiving plate 17, and the portion protruding below the driven pulley 10 is engaged. The driven pulley 10 is inserted to a position where it abuts against the back of the fitting hole 16a, and the driven pulley 10 of this support shaft 20 is rotatably supported. At that time, the belt 11 is wound around the driven pulley 10 in advance as a force for sliding the support shaft 20 deep into the elongated hole 17a and the engagement hole 16a, and if the tension of the belt 11 is used, the support shaft 20 is framed. 6 can be easily locked.

As shown in FIG. 8, the movable body 14 comprises a lever 21 made of metal and a slider receiver 22 made of synthetic resin. As will be described later, these lever 21 and slider receiver 2 are provided.
The two are joined and integrated. As shown in FIG. 9, the lever 21 has a knob portion 21 a, a guide hole 21 b into which the blind plate 4 is inserted, a tubular portion 21 c to be inserted into the guide shaft 12, and the tubular portion 21.
A hanging piece 21d hanging from c is formed, and sliding cylinders 23 made of synthetic resin are snapped in at both ends of the cylinder 21c. Further, an L-shaped bent portion 21e, a guide protrusion 21f, and a support protrusion 21 are provided on the front surface of the hanging piece 21d.
g is formed, a hook 21h and a stopper step 21i are formed on the back surface of the hanging piece 21d, and the first slider piece 24 is press-fitted into the support protrusion 21g.

As shown in FIGS. 10 and 11, the slider receiver 22 has a frame portion 22b having a storage hole 22a therein.
And a protruding piece 22c extending upward from the frame portion 22b,
An annular portion 22d to be inserted into the guide shaft 13 is formed, and a stepped locking groove 22e is formed on the inner wall of the frame portion 22b. Further, an uneven portion 22f having the same shape as the tooth portion 11a of the belt 11 is formed on the upper end of the protruding piece 22c, and a guide groove 22g is formed on the back surface of the protruding piece 22c. Further, the frame portion 22
A plurality of bosses 22h are formed on the front surface of b, and the first slider piece 24 and the second and third slider pieces 25 and 26 are caulked and fixed to these bosses 22h.

The movable body 14 thus constructed is fixed to the belt 11 as described above. In this case, as shown in FIGS. 12 and 13, first, the hanging piece 21d of the lever 21 is moved to the slider receiver 22. Into the housing hole 22a of the
The second protruding piece 22c is moved upward. At that time, lever 2
The support protrusion 21g of No. 1 is in contact with one side surface of the protruding piece 22c, and the guide protrusion 21f is engaged with the guide groove 22g. The support protrusion 21g and the guide protrusion 21f allow the protruding piece 22c to move smoothly with respect to the lever 21. You can move to. Then, at the position where the upper end of the protruding piece 22c slightly enters the inside of the bent portion 21e, the upper end of the locking groove 22e abuts the lower end of the stopper step portion 21i, and the force required to move the protruding piece 22c is increased. Since it increases, the protruding piece 22
The movement of c is temporarily stopped. In this state, the belt 11 is hung on the upper end of the protruding piece 22c, and the tooth portion 11a of the belt 11 is meshed with the uneven portion 22f of the protruding piece 22c. Then, when the protruding piece 22c is moved further upward, the upper end of the protruding piece 22c completely enters the inside of the bent portion 21e as shown in FIGS. 14 and 15, so that the belt 11 bends with the protruding piece 22c. It is held by the part 21e. At the same time, the locking claw 21h rides over the step of the locking groove 22e and snaps in, so that the lever 21 and the slider receiver 22 are integrated.

Next, the process of assembling the motor-driven slide type variable resistor constructed as described above will be described.

First, the motor 7 is attached to the support plate 18 of the frame 6.
Is screwed onto the rotary shaft 7a of the motor 7 and the drive pulley 8
Press-fit / fix. Next, the shaft hole 10 of the driven pulley 10
With the support shaft 20 inserted in b and the belt 11 wound around the driven pulley 10, the groove 20a of the support shaft 20 is inserted into the elongated hole 17a, and the lower end of the support shaft 20 is inserted into the engagement hole 16a. To do. After that, when the belt 11 is wound around the drive pulley 8, the support shaft 20 is tensioned by the belt 11 due to the tension of the belt 11.
Then, the driven pulley 10 is rotatably supported by the support shaft 20 locked in the elongated hole 17a and the engaging hole 16a. Next, the guide member 9 is attached to the drive pulley 8, and before and after this, the tubular portion 21c of the lever 21 is attached.
One guide shaft 12 is inserted into the sliding cylinder body 23 snapped into, and both ends of this guide shaft 12 are caulked and fixed to the groove portions 19a of the frame 6. Then, the respective slider pieces 24, 25, 26 are caulked and fixed to the slider receiver 22, and the protruding piece 22c of the slider receiver 22 is slightly inserted into the bent portion 21e of the lever 21, A part of the belt 11 is hung on the upper end of the protruding piece 22c, and the tooth portion 1 of the belt 11 is
1a is engaged with the uneven portion 22f of the protruding piece 22c. Thereafter, the protruding piece 22c is moved further upward, the belt 11 is held between the protruding piece 22c and the bent portion 21e, and the locking claw 21h is snapped into the stepped portion of the locking groove 22e so that the lever 21 and The movable member 14 is fixed to the belt 11 by integrating the slider receiver 22. Next, the first slider piece 24 is press-fitted into the support protrusion 21g, whereby the first slider piece 2 is pressed.
4 and the lever 21 are electrically connected, the other guide shaft 13 is inserted into the annular portion 22d of the slider receiver 22, and both ends of the guide shaft 13 are caulked and fixed to the groove portion 15b of the frame 6. , To obtain the motor drive unit 1 shown in FIG.

Next, the resistance substrate 5 is inserted between the positioning grooves 2a of the one cover 2, and the positioning projections 15a of the frame 6 are fitted into the positioning holes 5a of the resistance substrate 5 so that the cover 2 is covered. Overlapping the motor drive unit 1,
At the same time, the other cover 2 is superposed on the opposite side of the motor drive unit 1 and both covers 2 are screwed. In this state, the resistance board 5 and most of the components of the motor drive unit 1 are housed in both covers 2, but the knob portion 21a and the guide hole 21b of the lever 21 project from the gap at the upper ends of both covers 2. . Next, the blindfold plate 4 is attached to the guide hole 21.
The cover 3 is inserted through b to cover the gaps at the upper ends of both covers 2, and finally, the holders 3 are fixed to the left and right side surfaces of both covers 2 by screws to fix both ends of the blindfold plate 4 to the holder 3 and Assembly of the drive slide type variable resistor is completed.

When disassembling the motor-driven slide type variable resistor to replace the resistance substrate 5, the steps reverse to the above-mentioned assembly steps may be followed. Since the positioning groove 2a and the positioning protrusion 15a of the frame 6 are used for positioning and holding, sliding along the positioning groove 2a of the cover 2 does not require complicated work such as removing caulking or loosening screws. The resistance substrate 5 can be taken out by such a simple operation.

Next, the operation of the motor-driven slide type variable resistor configured as described above will be described.

When the motor 7 rotates in either the forward or reverse direction according to a signal from the outside, the drive pulley 8 rotates in accordance with the rotating direction, and the rotational force of the drive pulley 8 is the gear portion 8a and the tooth portion 11a. The belt 11 is surely transmitted to the belt 11 by meshing, so that the belt 11 is driven by the drive pulley 8 and the driven pulley 1.
Rotate around 0. When the belt 11 rotates, the movable body 14 fixed to the belt 11 moves to the guide shafts 1
It reciprocates in the direction of arrow P or Q in FIG. The movable body 14 holds the respective slider pieces 24 to 26, and the movement of the movable body 14 causes a resistor (not shown) on the resistance substrate 5 and the second and third slider pieces 2 to be held.
Since the sliding contact position with 5, 26 changes, the resistance value corresponding to the sliding contact position is output. At that time, when the movable body 14 moves to the end portions of both the guide shafts 12 and 13, the movable body 14 and the belt 11 cannot move any more and stop.
When the motor 7 continues to rotate, the phase of the gear portion 8a of the rotating drive pulley 8 and the tooth portion 11a of the belt 11 that is stopped shifts, so the belt 11 is pushed outward by the drive pulley 8, It contacts the inner wall of the guide member 9. Here, since the minimum gap size a between the belt 11 and the guide member 9 is set smaller than the tooth clearance size b of the tooth portion 11a of the belt 11, when the belt 11 is pushed outward by the size a, the guide The expansion of the belt 11 is stopped by the member 9. Therefore,
Since the gear portion 8a of the drive pulley 8 cannot ride over the tooth portion 11a of the belt 11 and the rotations of the drive pulley 8 and the motor 7 are forcibly locked by the belt 11, the gear portion 8a
The abnormal noise due to the engagement / disengagement between the tooth and the tooth portion 11a does not occur.

On the other hand, the operator operates the knob 21 of the lever 21.
When a finger is touched on a, static electricity charged to the operator is output via the first slider piece 24 and a current collector (not shown) on the resistance substrate 5 in sliding contact therewith, and based on the output signal thereof. The motor 7 stops rotating. Then, the operator operates the knob 2
When the movable body 14 is reciprocated in the direction of arrow P or Q in FIG. 1 by pinching 1a, the belt 11 rotates together with the drive pulley 8 and the driven pulley 10, and the movement of the movable body 14 is the same as when the motor is driven. A resistance value corresponding to is output. At that time, the belt 11 is in contact with both the restricting portions 9e of the guide member 9, and the relative position between the belt 11 and the guide member 9 is slightly shifted depending on the moving direction of the movable body 14, but this deviation causes the guide member 9 to rotate. Is absorbed by doing. That is, the direction in which the movable body 14 approaches the drive pulley 8 (arrow P
Direction), a force in the compression direction acts on the belt 11 between the movable body 14 and the drive pulley 8, and conversely,
When the movable body 14 moves in the direction away from the drive pulley 8 (direction of arrow Q), the belt 11 between the movable body 14 and the drive pulley 8 receives a force in the pulling direction. Since the guide member 9 rotates following the belt 9, the belt 11 is always in contact with the both restricting portions 9e in good balance, and the guide member 9 does not hinder the rotation of the belt 11.

In the above embodiment, the first part of the frame 6 is
The case where the long hole 17a and the elongated engaging hole 16a facing each other are formed in the receiving plate 17 and the second receiving plate 16 of the above has been described, but the engaging hole 16a of the second receiving plate 16 is supported. Since the movement of the shaft 20 in the direction of the drive pulley 8 is regulated, other shapes such as a circular shape and a rectangular shape can be adopted.

[0026]

As described above, according to the present invention,
As a structure in which the driven pulley is axially supported by the frame, a first receiving plate having an elongated hole and a second receiving plate having an engaging hole are installed to face each other in the frame, and the driven pulley has a recess on one end side of the supporting shaft. Since a groove is formed and the shaft is slid to the back of the long hole and the engagement hole by the tension of the belt, the assembly work is more difficult than the conventional technique in which the driven pulley shaft is caulked and fixed to the frame. The property becomes extremely good, and the cost can be reduced. In addition, when the engaging hole of the second receiving plate is extended in the same direction as the elongated hole of the first receiving plate and the engaging hole and the elongated hole are opposed to each other, the support shaft is supported by the first and second receiving plates. Since it can be easily inserted into the long hole and the engagement hole from the side of the plate,
Assembly work can be performed more easily.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing the overall configuration of a motor-driven slide type variable resistor according to an embodiment of the present invention.

FIG. 2 is a perspective view of a motor drive unit included in the motor drive slide type variable resistor.

FIG. 3 is an exploded perspective view showing a support structure of a drive pulley provided in the motor drive unit.

FIG. 4 is an explanatory diagram showing a positional relationship between the drive pulley and a guide member.

FIG. 5 is a cross-sectional view showing an attached state of the guide member.

6 is an exploded perspective view showing a support structure of a driven pulley provided in the motor drive unit of FIG.

FIG. 7 is a cross-sectional view showing a mounted state of the driven pulley.

FIG. 8 is an exploded perspective view of a movable body included in the motor drive unit of FIG.

FIG. 9 is a side view of a lever included in the movable body.

FIG. 10 is a plan view of a slider receiver provided on the movable body.

FIG. 11 is a rear view of the slider receiver.

FIG. 12 is a plan view showing a state in which the movable body of FIG. 8 is being attached to a belt.

13 is a cross-sectional view taken along the line AA of FIG.

FIG. 14 is a plan view showing a state in which the movable body of FIG. 8 has been attached to a belt.

15 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor drive unit 5 Resistance board 6 Frame 7 Motor 7a Rotating shaft 8 Drive pulley 8a Gear part 8b Collar part 9 Guide member 9b First snap claw 9c Second snap claw 9e Restriction part 10 Driven pulley 10a Gear part 11 Belt 11a Tooth portion 12, 13 Guide shaft 14 Movable body 16 Second receiving plate 16a Engagement hole 17 First receiving plate 17a Long hole 18 Support plate 18a Through hole 18b Regulation hole 19 Standing piece 19b Locking hole 20 Spindle 20a Recess Groove 21 Lever 21a Knob portion 21d Hanging piece 21e Bent portion 21f Guide protrusion 21h Locking claw 21i Stopper step 22 Slider receiver 22a Storage hole 22c Projecting piece 22e Locking groove 22f Uneven portion 22g Guide groove 24, 25, 26 Slider piece

Claims (2)

[Claims] 1. A drive pulley rotated by a motor,
A driven pulley rotatably supported by a frame, a belt stretched between the drive pulley and the driven pulley, a movable body having a slider piece fixed to the belt, and a slider piece. A first receiving plate having an elongated hole and a second receiving plate having an engaging hole, which are provided to face each other, and are formed on one end side of a spindle of the driven pulley. The motor drive slide type variable resistor characterized in that the recessed groove is inserted into the elongated hole so as to hold the first receiving plate, and the other end side of the support shaft is inserted into the engaging hole. . 2. The motor drive slide type variable resistor according to claim 1, wherein the engaging hole extends in the same direction as the elongated hole, and the engaging hole and the elongated hole face each other. vessel.