JPH0745761Y2 - Variable resistance type setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a setting device using a variable resistor, and more particularly to the structure of a pointer portion and an adjusting knob thereof.

[Conventional technology]

A conventional setting device of this type has a structure as described below.

For example, to explain using a setter for setting the temperature of a building air conditioner as an example, insert a knob with an indicator that indicates the temperature adjustment display scale on the resistance value adjustment axis of the variable resistor, and The adjustment shaft of the variable resistor and the knob are fixed by inserting a screw from the side surface and pressing the tip end of the screw against the side surface of the adjustment shaft. In general, a commercially available variable resistor has an adjustment shaft that rotates indefinitely.Therefore, a separate stopper is provided on the knob so that the adjustment shaft can rotate only within a necessary resistance value range. The turning range was regulated. In addition, in general, commercially available variable resistors require a small braking force to rotate the adjustment shaft, so the adjustment setting position easily changes. It was provided. Further, the scale instructed by the instructing portion of the knob is displayed on the case or the like in which the variable resistor is stored. Further, the temperature is adjusted by projecting the outer periphery of the knob from the side surface of the case and touching the knob of the projecting portion.

[Problems to be solved by the device]

As described above, in the conventional setting device, various parts must be separately provided in order to give the variable resistor a setting function, and thus the shape of the setting device becomes large and expensive. Had.

In addition, the scale displayed on the case will be displaced depending on the mounting condition of the case, and the positional relationship between the knob's indicator and the scale will follow accordingly.Also, when adjusting and setting the knob's indicator and scale, the set screw Due to the structure in which the tip portion is pressed against the rounded side surface of the shaft, the position to be set is displaced, so that there is a problem that accurate adjustment cannot be performed.

[Means for Solving the Problems]

This application was made in order to solve the above problems,
According to a first aspect of the present invention, a cylindrical adjustment knob that is locked to a variable resistor and has a stepped portion on the outer periphery thereof, a scale plate that is rotatably fixed to the surface of the adjustment knob, and a scale plate that is fixed to a circuit board are provided. ， Consists of a pointer part that is formed by pressing the outer circumference of the step of the adjustment knob and pointing to the scale of the scale plate, and the projection on the step pressing surface of the pointer is attached to the projection on the step of the adjustment knob. It is made to abut.

[Action]

According to the first invention, the pointer portion formed of a single plate material fulfills a braking function as a friction body, a stopper function for regulating the turning range of the adjusting knob, and a display scale indicating function.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, (a) is a plan view,
(B) shows a side view, FIG. 2 shows a state in which the setting device shown in FIG. 1 is covered with a cover, (a) is a plan view,
(B) shows a side view.

In the figure, reference numeral 1 denotes a setting device for adjusting the temperature of a building air conditioner. The setting device 1 includes a circuit board 2 on which a control circuit for adjusting the temperature is formed, and a case in which the circuit board 2 is housed. Main body 3 and cover 4 that covers the main body 3 of the case
And are the main components.

A variable resistor 5 for temperature adjustment, a terminal board 6 for external wiring, etc. are fixed to the circuit board 2, and a cylindrical adjustment knob is provided on an adjustment shaft 5A for adjusting the resistance value of the variable resistor 5. 7 is locked. A step portion 7A is formed on the outer periphery of the adjusting knob 7, a knurl for slip prevention is cut on the outer peripheral surface of the step portion 7A, and projecting portions 7B are formed at two locations on the step portion 7A. Further, a circular scale plate 8 is fixed on the surface of the adjusting knob 7, and a scale for temperature adjustment is printed and displayed on the surface of the scale plate 8. Further, the scale plate 8 has a groove in the circumferential direction.
8A is cut, and the scale plate 8 is screwed to the adjusting knob 7 through the groove 8A. Therefore, the scale plate 8 is rotatable within the width of the groove 8A.

Further, a pointer portion 9 is fixed to the circuit board 2, and the pointer portion 9 is made of one phosphor bronze plate having a spring property, and its shape is shown in FIG. 3 ((a) is a plan view and (b) is shown in FIG. Side view, (c)
Is shown in the front view). One surface 9A of the pointer portion 9 presses the outer circumference of the step portion 7A of the adjusting knob 7, and an indicator portion 9B formed by bending is formed at one end thereof, and the indicator portion 9B indicates the scale of the scale plate 8. ing. Furthermore, the face
9A has a protrusion formed by stamping.
9C is formed so as to abut the protrusion 7B of the adjusting knob 7. 9D is a projection for fixing the pointer portion 9 to the circuit board 2 by soldering.

Further, the outer circumference of the step portion 7A of the adjusting knob 7 is smaller than the width of the case body 3 and the cover 4, and when the cover 4 is fitted to the case body 3, the outer circumference of the step portion 7A is these case body 3 and And, it does not project to the outside from the side surface of the cover 4. However, since the gap 4A is formed on both side surfaces of the cover 4 near the outer periphery of the stepped portion 7A, the outer periphery of the stepped portion 7A can be touched. Further, the scale 4 of the scale plate 8 and the pointing portion 9B of the pointer portion 9 can be seen from the window portion 4B formed in the cover 4.

In such a structure, in adjusting the temperature of the setting device 1, the fingers are brought into contact with the gaps 4A on both side surfaces of the cover 4, and the adjustment knob 7 is rotated by touching the outer periphery of the step portion 7A of the adjustment knob 7, The desired scale value of the scale plate 8 visible through the window portion 4B of No. 4 is adjusted to the indicator portion 9B of the pointer portion 9.

At this time, the rotation range of the adjustment knob 7 is regulated by the protrusion 7B of the adjustment knob 7 coming into contact with the protrusion 9C of the pointer portion 9.

Further, since the surface 9A of the pointer portion 9 presses the outer periphery of the stepped portion 7A of the adjustment knob 7, a frictional force is applied to the rotation of the adjustment knob 7, and the rotation of the adjustment knob 7 becomes heavy. Therefore, it is possible to finely adjust the scale of the indicator 9B and the scale of the scale plate 8, and the set value once set does not change even if there is a slight vibration.

Further, as for the distance between the tip of the indicator 9B and the scale of the scale plate 8, the surface 9A of the pointer 9 has a step 7A of the adjusting knob 7.
Since the position of this surface 9A is determined by contacting the outer periphery of
It depends only on the distance from the bending root of the indicator 9B to the bending tip. Therefore, the distance between the tip of the indicating portion 9B and the scale of the scale plate 8 is determined by the bending accuracy of the indicating portion 9B and can be made extremely short, so that finer scale adjustment can be performed.

Further, since the scale plate 8 and the surface of the adjusting knob 7 are fixed face-to-face, unlike the conventional structure in which the head of a screw is pressed against the side surface of the shaft to be fixed, the scale plate 8 is easily and surely fixed. .

In addition, the pointer portion 9 fixed to the circuit board 2 and the adjusting knob 7
Since the adjustment amount is calibrated with the scale plate 8 fixed to the surface of the, unlike the structure in which the conventional scale for displaying the adjustment amount is displayed on the surface of the cover or the like,
Accurate adjustment can be performed because the indication part of the adjustment part such as a knob and the scale for displaying the adjustment amount are not displaced.

Further, since the step portion 7A of the adjusting knob 7 does not project from the side surfaces of the case body 3 and the cover 4, the adjusting knob 7 will not be accidentally moved.

As described above, in this embodiment, since only the pointer portion 9 made of one phosphor bronze plate performs the braking function of the adjusting knob 7, the rotation range regulating function of the adjusting knob 7 and the graduation state function, the present apparatus is used. Is extremely compact and inexpensive.

[Effect of device]

As described above, according to the first invention of the present application, a cylindrical adjustment knob that is locked to a variable resistor and has a step portion on the outer periphery, and a scale rotatably fixed to the surface of the adjustment knob are provided. It is composed of a plate and a pointer part that is fixed to the circuit board and that has an indicator part that presses the outer circumference of the step part of the adjustment knob and indicates the scale of the scale plate. Since the protrusions on the step pressing surface are brought into contact with each other, the pointer function consisting of a single plate material allows the brake function as a friction body, the stopper function for regulating the turning range of the adjusting knob, and the indication of the display scale. Since the function is fulfilled, the conventional setter has to be equipped with various parts separately, which eliminates the problem that the size of the setter becomes large and expensive. In addition, the conventional problem that the scale displayed on the case and the knob indication cannot be adjusted accurately is solved, and a setter that can perform accurate adjustment is obtained. Has the effect of being

[Brief description of drawings]

1 (a) is a plan view of the setting device showing an embodiment of the present invention when a cover is removed, FIG. 1 (b) is a side view thereof, and FIG. 2 (a) is a setting shown in FIG. Fig. 3 (a) is a side view of Fig. 3 (a) and Fig.
The plan view of the pointer part shown in the figure, (b) is this side view,
(C) is this front view. 1 ... Setting device, 2 ... Circuit board, 3 ... Case body, 4
...... Cover, 4A ... Gap, 5 ... Variable resistor, 5A ... Adjustment shaft, 7 ... Adjustment knob, 7A ... Step, 7B ... Protrusion,
8: Scale plate, 8A: Groove, 9: Pointer, 9B
…… Indicator, 9C …… Protrusion.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical adjustment knob, which is locked to a resistance value adjusting shaft of a variable resistor fixed to a circuit board and has a step portion on its outer circumference, and rotatably fixed to the surface of the adjustment knob. An instruction consisting of a scale plate on which a scale for adjustment is displayed, and one end fixed to the circuit board, one surface of which is pressed against the outer circumference of the cylindrical step portion of the adjustment knob, and the other end of which is bent to indicate the scale of the scale plate. A second protrusion formed on the step portion pressing surface of the pointer portion on the first protrusion formed on the step portion of the adjusting knob. A variable resistance type setting device that regulates the rotation allowable range of the adjustment knob by bringing the protrusions of the above into contact.