JPH0584802U - Stroke sensor - Google Patents

Abstract

(57) [Abstract] [Purpose] The output value obtained according to the contact position of the brush is stabilized by always keeping the set length of the brush with respect to the resistor. [Structure] A resistor 2 is attached to a resistor substrate 1, and slide shafts 3 are provided above the resistor substrate 1 so as to be parallel to the resistor 2. Further, a guide plate 4 is movably provided on the slide shafts 3 and, and a brush base 9 is attached to the lower surface side of the guide plate 4 via an urging member 15, and the tip of the brush base 9 is attached to the resistance substrate 1. Make sliding contact. Further, the brushes 13, 13 are mounted on the lower surface side of the brush base 9, and the tips thereof are brought into sliding contact with the resistors 2, 2. Even if the resistance substrate 1 and the resistors 2 and 2 are warped, the brush base 9 is always urged toward the resistance substrate 1 by the urging force of the urging member 15. The set length of the resistors 13 and 13 with respect to the resistors 2 and 2 can always be made constant.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stroke sensor, and more particularly, to a stroke sensor that detects a stroke by detecting a contact position of a brush on a resistor.

[0002]

[Prior art and its problems]

 Generally, this type of stroke sensor is constructed as shown in FIGS. 2 and 3, FIG. 2 is a schematic view showing the whole, and FIG. 3 is a side view of what is shown in FIG.

That is, this stroke sensor includes a resistance substrate 21 in the form of a flat plate, a thin-walled flat plate-shaped resistor 22 attached on the resistance substrate 21, and a resistor plate 21 above the resistance substrate 21 in parallel with the resistance substrate 21. The slide shafts 23 and 23 arranged at predetermined intervals so that the brush shafts 29 and 23 are arranged on the slide shafts 23 and 23 and are movable along the slide shafts 23 and 23. A pair of brushes 33, 33 are attached to the lower surface side of the brush base 29, and the tip portions of the brushes 33 and 33 are in sliding contact with the upper surface side of the resistors 22 and 22 at a predetermined angle and a predetermined set length. It has.

The brush base 29 of the stroke sensor configured as described above is mounted on the lower surface side of the brush base 29 by moving the brush base 29 along the slide shafts 23, 23 and positioning it at a desired position. The brushes 33, 33 are slid on the resistors 22, 22 to be positioned at desired positions, and the leads connected to the resistors 22, 22 have an output value corresponding to the contact position of the brushes 33, 33 at this time. The stroke corresponding to the contact position of the brushes 33, 33 can be detected by taking it out to the outside through the lines 35, 35.

In this case, if the set length of the brushes 33, 33 with respect to the resistors 22, 22 varies, the contact pressure of the brushes 33, 33 with respect to the resistors 22, 22 also varies, The output values obtained according to the contact positions of the brushes 33, 33 on the resistors 22, 22 become unstable, and the stroke detection accuracy decreases. Therefore, the slide shafts 23, 23 and the resistance substrate 21 are normally used. The tolerances such as the distance from the (resistors 22 and 22), the clearance (play) between the brush base 29 and the slide shafts 23 and 23, and the warp degree of the resistance substrate 21 are made strict, and the brushes 33 and 33 resist. The bodies 22 and 22 are always in sliding contact with a constant contact pressure.

However, in the conventional stroke sensor configured as described above, since the distance between the brush base 29 and the resistance substrate 21 (resistors 22, 22) cannot be adjusted, When the resistance substrate 21 and the resistors 22, 22 attached to the upper surface of the resistance substrate 21 are very long and warp occurs, the distance between the brush base 29 and the resistance substrate 21 is set to the resistance substrate 21. There is a difference between the two ends and the center (see Fig. 3).

Therefore, the set length of the brushes 33, 33 with respect to the resistors 22, 22, that is, the contact pressure with respect to the resistors 22, 22 is significantly different between the central portion and both ends of the resistors 22, 22. There is a problem in that the output value obtained depending on the contact position of the brushes 33, 33 becomes unstable, and the stroke detection accuracy is significantly reduced.

This invention solves the problems of the conventional ones described above, and the set value of the brush to the resistor, that is, the contact pressure to the resistor is always constant, so that the output value is It is an object of the present invention to provide a stroke sensor capable of stabilizing the stroke and significantly increasing the stroke detection accuracy.

[0009]

[Means for solving problems]

 In order to solve the above problems, the present invention has a resistor substrate, a resistor attached to the resistor substrate, and a predetermined space above the resistor so as to be parallel to the resistor. A slide shaft to be disposed, a guide plate disposed on the slide shaft and movable along the slide shaft, and a guide plate mounted on the lower surface side of the guide plate via a biasing member to bias the biasing member. The brush base is urged in the direction of the resistance board by the force, and the tip of the brush base is slidably contacted on the resistance board. It employs the means of having a brush to contact.

[0010]

[Action]

 By adopting the above-mentioned means, the present invention allows the brush table on which the brush is mounted to be constantly urged toward the resistance substrate (resistor) by the urging force of the urging member, and Since the tip part makes sliding contact with the resistance board, the distance between the brush base and the resistance board should be maintained even when the resistance board and the resistor attached to the resistance board warp. Therefore, the set length of the brush mounted on the brush base with respect to the resistor, that is, the contact pressure of the brush with respect to the resistor can always be kept constant. As a result, the output value obtained according to the contact position of the brush can be stabilized, and the stroke detection accuracy can be improved.

[0011]

【Example】

 An embodiment of the present invention shown in the drawings will be described below. FIG. 1 shows a sectional view of an embodiment of a stroke sensor according to the present invention. The stroke sensor shown in this embodiment has a flat resistance substrate 1 and a resistance substrate 1 attached to the resistance substrate 1. A pair of thin plate-shaped resistors 2 and 2, and a pair of slide shafts 3 and 3 disposed above the resistors 2 and 2 at a predetermined interval so as to be parallel to the resistors. A guide plate 4 disposed on the slide shafts 3 and 3 and movable along the slide shafts 3 and 3, and attached to the guide plate 4 via a biasing member 15 so as to be integrated with the guide plate 4. And a brush base 9 that is movable toward the resistance substrate 1 by the urging force of the urging member 15, and is mounted on the lower surface side of the brush base 9 and has a tip portion at a predetermined angle. Slide on resistors 2 and 2 And it comprises a pair of brushes 13, 13 in contact.

The guide plate 4 has a box shape in which a cavity 5 having an opening on the lower surface side is formed, and on the upper surface side, a pair of shaft insertion holes 6, 6 penetrating in the axial direction. A plurality of through holes 7, 7 penetrating in the up-down direction are formed respectively, and the pair of slide shafts 3, 3 are inserted into the shaft insertion holes 6, 6, and A guide shaft 10 of a brush base 9 described later is inserted into the through holes 7, 7. Further, projecting portions 8 which project inward in the drawing are integrally formed in the lower surface side opening portion.

At positions corresponding to the through holes 7, 7 of the guide plate 4 on the upper surface side of the brush base 9, rod-shaped guide shafts 10, 10 projecting upward in the drawing are integrally formed. The upper and lower end portions are integrally formed with projecting portions 11 and 11 that project to the left and right in the figure, and the dimension between the tip portions of these projecting portions 11 and 11 is the space 5 of the guide plate 4. It is formed to be slightly smaller than the inner dimension of. Further, a concave portion 12 having a predetermined depth is formed on the lower surface side, and the pair of brushes 13, 13 are attached to the bottom surface side of the concave portion 12, and the opening portion of the concave portion 12 is formed. On the inner surface side thereof, stepped portions 14, 14 having a width slightly larger than the lateral width of the resistance substrate 1 are formed.

Then, the brush base 9 configured as described above is placed in the space 5 of the guide plate 4, and the tip ends of the protrusions 11, 11 at both ends of the upper surface side are located on the inner surface side of the space 5. And the guide shafts 10 and 10 on the upper surface side are inserted into the through holes 7 and 7 on the upper surface side of the guide plate 4 via the biasing members 15 and 15, respectively. By engaging the respective stepped portions 14, 14 of the tip portion of 12 with both widthwise end portions of the resistance substrate 1, the tip portions of the brushes 13, 13 mounted in the recess 12 on the lower surface side have a predetermined angle. Then, the resistors 2 and 2 attached on the resistor substrate 1 are brought into contact with each other.

Next, the operation of the above will be described. First, when the guide plate 4 mounted on the slide shafts 3 and 3 is moved along the slide shafts 3 and 3 and positioned at a desired position, the brush base 9 mounted on the guide plate 4 is moved to the guide plate 4 The brushes 13, 13 mounted on the lower surface side of the brush base 9 also move integrally with the brush base 9, and slide on the resistor bodies 2, 2 attached on the resistance substrate 1. It moves and is positioned at the desired position. Then, the output value corresponding to the contact position of the brushes 13 and 13 at this time is taken out to the outside through a lead wire (not shown) connected to the resistors 2 and 2, so that the contact position of the brushes 13 and 13 is determined. The stroke can be detected.

In this case, even when the resistance substrate 1 and the resistors 2 and 2 attached to the resistance substrate 1 are very long and warp occurs in both, the brush base 9 is The urging force of the urging member 15 interposed between the brush base 9 and the guide plate 4 always urges the resistance substrate 1 in the direction of the resistance substrate 1, so that it is not affected by the warp of both. Therefore, the distance between the brush base 9 and the resistor 2 can always be kept constant.

Therefore, the set length of the brushes 13 and 13 mounted on the lower surface side of the brush base 9 with respect to the resistors 2 and 2, that is, the contact pressure of the brushes 13 and 13 to the resistors 2 and 2 is always maintained. In this case, since the step portions 14 and 14 at the tip of the brush base 9 are in sliding contact with both ends of the resistors 2 and 2 in the width direction, the brushes 13 and 13 can be fixed. It is possible to make the contact state of the resistors 2 and 2 constant with this, whereby the output value obtained according to the contact position of the brushes 13 can be stabilized, and the stroke detection accuracy can be improved. Can be significantly increased.

[0018]

[Effect of the device]

 This invention is configured as described above, and the brush base mounted on the guide plate that moves along the guide shaft is always biased in the direction of the resistance substrate by the biasing force of the biasing member. , If the resistance plate and the resistor are warped, and the distance between the guide plate and the resistance substrate (resistor) changes, the distance between the brush base and the resistance substrate should be Therefore, the set length of the brush mounted on the lower surface side of the brush base with respect to the resistor is always constant without being affected by the warpage state of the resistor board and the resistor. You will be able to Therefore, the contact pressure of the brush with the resistor can be made constant at all times, and the output value obtained according to the contact position of the brush can be stabilized, which significantly improves the stroke detection accuracy. It has an excellent effect such as being able to do so.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a stroke sensor according to the present invention.

FIG. 2 is a schematic diagram showing an example of a conventional stroke sensor.

FIG. 3 is a side view of what is shown in FIG.

FIG. 4 is an explanatory view showing a contact state of the brush shown in FIG.

[Explanation of symbols]

 1, 21 ...... Resistor board 2, 22 ...... Resistor 3, 23 ...... Slide shaft 4 ...... Guide plate 5 ...... Space 6 ...... Hole for shaft insertion 7 ...... Through hole 8, 11 ...... Projection Part 9, 29 ...... Brush base 10 ...... Guide shaft 12 ...... Recessed part 13, 33 ...... Brush 14 ...... Step part 15 ...... Biasing member 35 ...... Lead wire

Claims (1)

[Scope of utility model registration request] 1. A resistance substrate (1) and this resistance substrate (1)
A resistor (2) (2) stuck on the resistor and a resistor (2) (2) disposed above the resistor (2) (2) at a predetermined interval so as to be parallel to the resistor (2) (2). Slide shaft (3) (3), a guide plate (4) disposed on the slide shaft (3) (3) and movable along the slide shaft (3) (3), and the guide plate It is attached to the lower surface side of (4) through a biasing member (15),
The brush base (9) is urged in the direction of the resistance substrate (1) by the urging force of the urging member (15), and the tip of the brush base (9) is in sliding contact with the resistance substrate (1). ), The brushes (13) (13) mounted on the lower surface side of the brushes and the tips of which are in sliding contact with the resistors (2) (2).
A stroke sensor characterized by having and.