JPH0347695B2 - - Google Patents

Description

A horn switch inspection machine comprising: displacement measuring means 35, 52 for measuring the displacement of a horn switch 73.

2. The support base 12 is provided with support base moving means 3 to 11 for moving the support base 12 in a direction orthogonal to the contact member 39. Horn switch inspection machine.

3. The horn switch inspection machine according to claim 1, wherein the contact member 39 is rod-shaped and has a flat surface that contacts the pressing plate 73 at its tip.

4. The horn switch according to claim 1, wherein the load measuring means includes a load cell 37 connected to a contact member 39 and a microcomputer 52 that calculates the load from a resistance change of the load cell 37. Inspection machine.

5 The displacement measuring means includes a linear potentiometer 35 that detects the displacement of the contact member 39, and a pressure plate 7 based on the resistance change of the linear potentiometer 35.
3. The horn switch inspection machine according to claim 1, further comprising a microcomputer 52 for calculating the displacement of the horn switch.

[Detailed description of the invention]

Object of the Invention (Field of Industrial Application) The present invention relates to an inspection machine for a horn switch attached to a steering wheel, and more specifically, it measures the load and stroke that must be applied to the pressure plate of the horn switch in order to sound the horn. The present invention relates to an inspection machine for determining the quality of the horn switch.

(Prior Art) Inspection of the horn switch in a conventional steering wheel is carried out by an inspector pressing the pressure plate of the horn switch with his/her hand, and if the horn sounds, the test is judged as passing; if the horn does not sound, the test is judged as failing. The inspection method used was to use a pulse motor and a pressure exchanger operated by the motor and perform complex electrical control.

(Problems to be Solved by the Invention) As mentioned above, in the conventional inspection method in which the inspector manually presses the horn switch, the pressure of the horn switch varies depending on the inspector. It was not possible to accurately determine whether the load that must be applied to the pressing plate was an appropriate value. Therefore, this load value varies from steering wheel to steering wheel, and there is a risk that some steering wheels require a large load to sound the horn, and some may sound even if the horn is lightly touched.

In addition, the displacement of the pressure plate from when the pressure plate of the horn switch was touched until the contacts in the switch became conductive and the horn sounded (hereinafter, this total displacement is referred to as the stroke) was also ignored. After the parts were installed, there was a risk that problems such as the horn constantly ringing or not ringing would occur. The latter method also requires a complicated control mechanism and does not necessarily satisfy all requirements.

An object of the present invention is to eliminate the above-mentioned problems, and to determine whether the load and stroke to be applied to the pressure plate of the horn switch are appropriate values, thereby making it possible to accurately determine the quality of the horn. Our goal is to provide a switch inspection machine.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a device that protrudes from the support base of a jig that supports the steering wheel, and that fits into and contacts the boss hole of the steering wheel. Detection for detecting ON and OFF of the horn switch contact, which consists of a support rod, a receiving contact that contacts the slip ring of the steering wheel, and a contact member that can contact the pressing plate of the horn switch provided on the steering wheel. means, a main cylinder for bringing the steering wheel and the contact member relatively close to each other, and a sub-cylinder for pressing the contact member against the press plate; A horn switch inspection machine is constructed of a load measuring means for measuring the applied load and a displacement measuring means for measuring the displacement of the pressing plate caused by the pressing of the contact member.

(Function) When the steering wheel is installed on the jig,
The support rod 15 is fitted into the boss hole, and the receiving contact 16 is brought into contact with the slip ring of the steering wheel, forming a circuit for sounding a normal horn with the horn switch contact open. Then, when the moving means is operated and the contact member and the steering wheel supported by the jig come relatively close to each other, the contact member first contacts the pressing plate of the horn switch. At this time, the load measuring means detects the contact and measures the load applied to the horn switch by the contact member. Further, the displacement measuring means measures the displacement of the pressing plate caused by the contact member.

As the contact member presses the pressing plate further, the load and displacement increase, and at a certain displacement, the contact in the horn switch turns ON. The load measuring means measures the load applied to the pressing plate when the contact is turned on. Further, the displacement measuring means measures the stroke (total displacement) of the press plate that occurs from when the contact member contacts the press plate until the contact is turned on. By determining whether the measured values of the load and stroke are appropriate values, the quality of the horn switch is determined.

(Example) Hereinafter, an example of a horn switch inspection machine embodying the present invention will be described with reference to the drawings.

First, regarding the automobile steering wheel and its horn switch to be inspected in this example,
This will be explained according to FIGS. 2 and 3. As shown in FIG. 3, a boss 62 is provided at the center of the lower part of the steering wheel 61, and a boss hole 63 into which a steering shaft (not shown) of an automobile is inserted is formed in the boss 62. A boss plate 64 connected to the boss 62 has two parts extending diagonally downward.
A book spoke portion 65 is attached, and a ring portion 66 is supported at the tip of the spoke portion 65. Further, a lower cover 67 is attached below the boss plate 64, and a slip ring 68 is attached to the lower surface of the lower cover.

When the steering wheel 61 configured as described above is attached to a steering shaft (not shown), a circuit for sounding a horn (not shown) is configured, but since this circuit is well known, the outline thereof will be explained below. I will only explain about. When the steering wheel 61 is attached to the steering shaft as described above, a contact pin provided on the vehicle body (not shown) comes into contact with the slip ring 68, and the contact pin of the slip ring 68 is connected to the boss plate via the horn, battery, and vehicle body. A circuit for sounding the horn leading to the boss plate 64 is formed, but a horn switch 71 for sounding the horn provided above the boss plate 64 is always open as described below. The horn switch 71 has a contact 72 provided inside, a rectangular pressing plate 73 that can be pressed to make the contact 72 conductive, and the pressing plate 73 attached above to keep the contact 72 OFF at all times. It is composed of two springs 74, upper and lower, that apply pressure. This horn switch 71 is for disconnecting the ground circuit of the horn, and has one terminal of a contact 72 connected to the slip ring 68 and the other terminal connected to the boss 62. The circuit itself for sounding the horn is conventionally well known as described above, and this circuit does not constitute the main part of the present application.

Further, after the steering wheel 61 is mounted on the automobile, a pad portion (not shown) is attached above the horn switch 71, and a pressing plate 73 is attached to the pad portion (not shown).
The back surface of the pad portion is brought into contact with the surface of the pad.

In this embodiment, the horn switch 71 is inspected on the steering wheel 61 before the pad part is attached and the pressing plate 73 of the horn switch 71 is exposed upward. It is.

Next, the horn switch inspection machine of this embodiment will be explained. This inspection machine includes a steering wheel support device A on a base 2 supported by a frame 1 forming each side of a rectangular parallelepiped, and a contact member that is brought into contact with the pressing plate 73 of the horn switch 71.
a detection device B for detecting the load and displacement of the horn switch 71;
The control device C calculates the load value and the displacement value (stroke value), and determines the quality of the horn switch 71. These will be explained below.

[Steering wheel support device A] Two guide rails 3 extending left and right at a constant interval are fixed to the central front part of the base 2, and a guide channel 4 is formed inside each guide rail 3. ing. A slide member 5 is fitted into the channel 4 of both guide rails 3 so as to be movable left and right, and a board 6 extending back and forth is mounted on the slide member 5.
is fixed. A regulating member 7 is attached at a position a certain distance from the left and right ends of the guide rail 3, and the regulating member 7 regulates the left and right movement limits of the slide member 5.

Further, a receiving contact 16 that contacts the slip ring 68 of the steering wheel 61 is provided on the upper surface of the support base 12, and the receiving contact 16 and the support rod 15 that contacts the boss 62 are connected to the horn switch 71, respectively. It is designed to be electrically connected to a contact point 72, and further connected to a microcomputer described later.

Two guide rails 8 extending back and forth are fixed to both edges of the upper surface of the substrate 6, and a guide channel 9 is formed inside each guide rail 8. A slide base 10 is fitted into the channel 9 of both guide rails 8 so as to be movable back and forth, and is adapted to slide on the front board 6. Further, an L-shaped stopper 11 is provided on the right edge of the base plate 6 to project forward, and the stopper 11 is adapted to restrict the forward movement limit of the slide base 10.

On the slide base 10 are a support stand 12 and a support rod 15 as a steering wheel support jig.
is provided. That is, the slide base 9
A cylindrical support stand 12 is attached to the center of the upper surface of the steering wheel, and the support stand 12 is adapted to support the back surface of the lower cover 67 of the steering wheel 61. Further, a support rod 15 consisting of a tapered portion 13 and a straight portion 14 is protruded from the center of the upper surface of the support base 12, and the support rod 15 is adapted to fit into and come into contact with a boss hole 63 of a steering wheel 61. There is.

Therefore, the steering wheel 61 supported on the support base 12 changes its position from side to side along with the base 6, slide base 10, support base 12, etc. as the slide member 5 moves left and right, and the slide base 10 changes its position from side to side. By moving back and forth, the position can be changed back and forth together with the support stand 12.

[Detection device B] Two pillars 21 are erected at a certain interval behind the support device A on the upper surface of the base 2, and a support plate 22 is horizontally supported at the upper end of the pillars 21. . A main cylinder 23 is located in the center of the support plate 22.
is attached facing downward, and its cylinder rod 24 passes through the support plate 22 and is extended downward.

An upper support plate 25 is horizontally supported at the lower end of the cylinder rod 2, and a lower support plate 27 is horizontally supported below the upper support plate 25 by two spacers 26. A sub-cylinder 28 is attached to the center of the lower support plate 27 facing downward.

Therefore, the upper and lower support plates 25, 27 and the sub-cylinder 28 are configured to change their positions up and down as the cylinder rod 24 of the main cylinder 23 moves up and down. In addition, cylinder rod 2
Even when the contact member 4 is extended most downwardly, the lower end of the contact member 39, which will be described later, approaches only to a distance of about 10 mm above the pressing plate 73.

In this way, the two main and sub cylinders 2
3 and 28, the main cylinder 23 moves the contact member 39 up and down with a large stroke when attaching and detaching the steering wheel 61, and the sub cylinder 28 is used for actual measurement. The operation is fast and measurement errors can be reduced.

A movable plate 30 extending left and right is attached to the lower end of the cylinder rod 29 of the sub-cylinder 28. Guide rods 31 are erected on both left and right sides of the movable plate 30, and the guide rods 31 are slidably fitted into guide holes (not shown) provided in the lower support plate 27. Further, the guide rod 31 is provided with an upper protrusion 32 and a lower protrusion 33 that can come into contact with the upper and lower surfaces of the lower support plate 27, respectively, to restrict the vertical movement limit of the movable plate 30. An extension plate 34 extending forward is attached to the lower part of the movable plate 30.

Further, the main body of a linear potentiometer 35 as a means for detecting displacement of the horn switch 71 is attached to the lower surface of the lower support plate 27, and the lower end of the movable rod 36 of the linear potentiometer 35 is attached to the lower end of the extending plate 34. It is in contact with the top surface. In this example,
The linear potentiometer 35 is a product manufactured by Midori Sokki Co., Ltd. (model number LP20F).

A load cell 37 is attached to the front end of the extension plate 34 as a load detection means for the horn switch 71, and the resistance value of a strain gauge (not shown) affixed to the load cell 37 determines the bending force applied to the load cell 37. The load can be detected by changing the In this embodiment, the load cell 37 is a Kyowa Dengyo product (model number LUB-
5KS) is used.

A mounting plate 38 that extends further forward is attached to the front end of the load cell 37, and a round bar-shaped contact member 39 that can contact the pressing plate 73 of the horn switch 71 is fixed to and hangs from the tip of the mounting plate 38. ing. A flat surface that can come into contact with the pressing plate 73 is formed on the lower end surface of the contact member 39 so that it does not slip against the pressing plate 73.

Therefore, the movable plate 30, the extension plate 34, the load cell 37, the contact member 39, etc. are arranged to change their positions up and down as the cylinder rod 29 of the sub-cylinder 28 moves up and down. Further, the movable rod 36 of the linear potentiometer 35 moves into and out of the main body of the linear potentiometer 35 as the extension plate 34 moves up and down, changing the resistance value of the potentiometer 35.

Note that support plates 2 are provided on both sides of the support plate 22.
A cover 40 having a U-shaped cross section is attached to cover the sides of the parts 5, 27, the sub cylinder 28, the movable plate 30, and the like. Further, a warning light 41 is attached to the left side of the upper surface of the support plate 22.

[Control Device C] The main part of the control device C is housed in a case 51 installed in the frame 1, and the central part thereof is a microcomputer 52 as shown in FIG.

The linear potentiometer 35 is connected to the microcomputer 52, and the microcomputer 52 detects the horn switch 71 based on the resistance change of the linear potentiometer 35.
The displacement and stroke of the pressing plate 73 are calculated. On the front of the case 51 are a digital switch 53 for setting the allowable upper limit of the stroke, a digital switch 54 for setting the allowable lower limit of the stroke, and a digital display section 55 for displaying the measured value of the actual stroke. are provided, and each of these is connected to a microcomputer 52.

Further, the load cell 37 is connected to the microcomputer 52, and the microcomputer 52 calculates the load on the pressing plate 73 of the horn switch 71 from the resistance change of the load cell 37. On the front of the case 51, there are a digital switch 56 for setting the upper limit of the allowable load, a digital switch 57 for setting the lower limit of the load, and a digital display 58 for displaying the actual measured value of the load. are provided, and each of these is also connected to the microcomputer 52.

Furthermore, valves 59 and 60 of the main cylinder 23 and sub cylinder 28 are connected to the microcomputer 52, and opening and closing of the valves 59 and 60 are controlled by the microcomputer 52.

The microcomputer 52 also includes a printing device 8 that prints out the load and stroke of the pressure plate 73 of the horn switch 71 as an output device.
1. B; Load failure lamp 82 on the front of case 61 that displays this when the load is outside the setting range; C; Stroke failure lamp on the front of case 61 that displays this when the stroke is outside the setting range 83, d; If either the load or the stroke is out of the set range, the warning light 41 and warning buzzer 84 are used to notify the inspector. A no-sound malfunction lamp 85 on the front of the case 61 is connected to display this when it is not turned on.

Further, on the front surface of the case 51, there are provided a measurement lamp 86 that indicates that the measurement is in progress, and a measurement completion lamp 87 that indicates that the measurement is completed.

Next, a method of inspecting the horn switch 71 using the horn switch inspection machine configured as described above will be explained.

First, the steering wheel 61 is attached to the support device A.
Set to . This setting work can be easily performed by simply fitting the support rod 15 of the support base 12 into the boss hole 63 of the steering wheel 61 and bringing the lower cover 67 into contact with the upper surface of the support base 12. At this time, the support rod 15 comes into contact with the boss 6, and the receiving contact 16 of the support stand 12 comes into contact with the slip ring 68, so the horn switch 7
It is possible to sense on the support stand 12 side whether or not the first contact 72 is conductive.

Next, the steering wheel 61 is attached to the support device A.
to set the position of the pressing plate 73 of the horn switch 71 exposed above where the contact member 39 of the detection device B should not be pressed. In the case of the horn switch 71 of this embodiment, as shown in FIG. 4, there are six pressing positions: at each of the four corners of the pressing plate 73, . Therefore, first, the steering wheel 61 is moved so that the part is directly below the contact member 39. The reason why a plurality of pressing positions of the pressing plate 73 are provided in this way is as follows.

That is, when the driver of a car sounds the horn, it is not determined at all which part of the pad part is pressed, and therefore, the position on which the load is applied on the pressing plate 73 of the horn switch 71 is also not fixed. be.

However, as mentioned above, since the pressing plate 73 is biased by the two upper and lower springs 74, the elastic force of each spring 74 acts differently depending on the position where the load is applied. The load that must be applied to 73 is also different. Furthermore, the value by which the press plate 73 is displaced before the horn sounds (hereinafter referred to as a stroke value) also differs depending on the position where the load is applied. Therefore, if the quality of the horn switch 71 is determined by only pressing one part of the pressing plate 73, the result will not be suitable for the actual usage of the horn switch 71.

Therefore, in this embodiment, it is possible to sequentially change the position at which the pressing plate 73 is pressed by the contact member 39, measure the load value and stroke value at various positions, and then determine the quality of the horn switch 73. I made it possible. Therefore, it is necessary to move the steering wheel 61 in advance to set the pressing position before measurement.

Note that if the board 6 is pressed left and right by hand, the board 6 will slide on the guide rail 3 together with the slide member 5, and the steering wheel 61 will move left and right together with the board 6, slide base 10, support base 12, etc. Moving. At this time, the regulating member 7 regulates the horizontal movement limit of the sliding member 5 so that the sliding member 5 does not come off the guide rail 3.

Also, if you move the support stand 12 back and forth by hand,
The steering wheel 61 has a slide base 10
and moves back and forth together with the support stand 12. At this time, the stopper 11 prevents the slide base 10 from coming off the guide rail 8.
Regulates the forward limit of 0.

Next, the order of operation of the detection device B by the control device C will be explained while following the flowcharts shown in FIGS. 7a, b, and c.

First, the digital switches 53 and 54 provided on the front surface of the case 51 are operated to set the allowable upper and lower limits of the stroke of the horn switch 71 relative to the press plate 73. In the case of this horn switch 71, the permissible upper limit of the stroke is 2.0 mm.
, and the lower limit was set to 0.5 mm.

Also, in the same way, digital switches 56, 57
are operated to set the allowable upper and lower limits of the load on the press plate 73. Hon horn switch 71
In this case, the allowable upper limit of the load when pressing the approximate center of the press plate 73 is set to 2.5 kg, and the lower limit is set to 0.5
It was set to Kg.

Therefore, as a result of the test described later, it is determined that the horn switch 71 whose load and stroke are within the above-mentioned setting range is a good product, and the horn switch 71 whose load and stroke are outside the range is a defective product.

Now, the power switch of control device C (not shown)
When the start switch is turned on, the microcomputer 52 determines whether or not the start switch is turned on, and if it is turned on, the valve 59 of the main cylinder 23 is turned on and the cylinder rod 24 is moved downward. Therefore, the upper and lower support plates 25, 27, the sub cylinder 28, the load cell 37, and the contact member 39, which are sequentially connected below the cylinder rod 24, move downward together. The feeding speed of the cylinder rod 29 can be arbitrarily determined since it does not affect the accuracy of measuring loads, etc., but it is preferably 10 mm/sec or more in order to shorten the inspection time and perform the inspection efficiently.

In this manner, when the lower end surface of the contact member 39 descends to a position approximately 10 mm above the pressing plate 73 of the horn switch 71, a limit switch (not shown) provided within the cover 40 is turned on. Note that before the limit switch is turned on, the inspection can be interrupted by turning on a reset switch (not shown) to turn off the valve 59 of the main cylinder 23.

When the limit switch is turned on, the measuring lamp 86 lights up. Further, the microcomputer 52 stores the initial load Y calculated from the resistance value of the load cell 37 at this time, turns on the valve 60 of the sub-cylinder 28, and moves the cylinder rod 29 downward. Therefore, the movable plate 30, the extension plate 34, the load cell 37, the mounting plate 38, and the contact member 39, which are connected in this order below the cylinder rod 29, all move downward.

Cylinder rod 29 in sub cylinder 28
The feeding speed of the main cylinder 23 is different from that of the main cylinder 23, and if it is too fast, there is a problem that the load data will be disturbed due to the influence of minute vibrations. Therefore, in order to shorten the inspection time without disturbing the load data, 1 to 10
Although a range of mm/sec is appropriate, in this example, the most preferable range was 1.7 to 4 mm/sec. In this way, in this embodiment, the contact member 39
main cylinder 2 until it approaches the pressing plate 73.
3 to quickly approach the pressing plate 73, and after the contact member 39 approaches the pressing plate 73, the sub cylinder 2
Since the test is carried out gradually using 8, it is possible to improve both the efficiency and accuracy of the test.

When the sub-cylinder 28 operates in this way, the movable rod 36 of the linear potentiometer 35 descends together with the extension plate 34, so the resistance value of the linear potentiometer 35 changes, and the microcomputer 52 detects the contact member from the change in resistance value. 39 displacement P is calculated.

After the sub-cylinder 28 operates, if the load calculated from the resistance value of the load cell 37 is less than 5 kg and the displacement P of the contact member 39 calculated from the resistance value of the linear potentiometer 35 is less than 10 mm, the microcomputer 52 The load X will now be read.

In addition, if the load is 5 kg or more or the displacement P is
If it is 10 mm or more, the lamp 86 is turned off during measurement, and the valves 5 of both cylinders 23 and 28 are turned off.
9 and 60 are turned off. This is because there is a possibility that the horn does not sound no matter how much pressure is applied to the pressing plate 73, that is, the horn does not sound abnormally. and,
Determine whether or not the horn is malfunctioning, and if the horn is malfunctioning, turn on the malfunction lamp 85, and if the horn is not malfunctioning, display a device malfunction (not shown)
do. Thereafter, when the reset switch is turned on, the no-sound failure lamp 85 is turned off, and the inspection is completed for the time being.

Now, returning to the case where there is no risk of abnormality, the lower end of the contact member 39 is connected to the pressure plate 7 of the horn switch 71.
When it comes into contact with the portion 3, a load starts to be applied to the press plate 73 and the press plate 73 starts to be displaced. Therefore, it is necessary to accurately detect this time of contact.

Therefore, in this embodiment, when the load X read by the microcomputer 52 from the resistance value change of the load cell 37 becomes 50 g larger than the initial load Y, {(X1+
X2+X3)/3-Y>50g} is detected as the time of contact. Because cylinder 28
The resistance value of the load cell 37 fluctuates due to the activation of the load cell 37 and vibrations generated from each sliding part, and the load X fluctuates by less than 50 g, so this is to block this influence.

Furthermore, the microcomputer 52 stores the displacement Q of the contact member 39 at the time of the contact. Horn switch 7
Until the contact point 72 in 1 is not ON, the contact member 3
9 presses the pressing plate 73.

When the contact 72 is turned ON, the microcomputer 52 stores the displacement R of the contact member 39 and the load D of the pressing plate 73 at this time, and turns OFF the valves 59 and 60 of both cylinders 23 and 28. Then, the microcomputer 52 calculates the stroke value F of the press plate 73 by subtracting the displacement Q from the displacement R of the contact member, and directly displays this on the digital display section 55.
Further, by subtracting the initial load Y from the load D, the load value E of the press plate 73 is calculated, and this is directly displayed on the digital display section 58.

Next, the microcomputer 52 determines that the calculated load value E and stroke value F are within the aforementioned setting range (the load is 0.5
~2.5Kg, stroke 0.5~2.0mm).

If the load value E is outside the setting range, the microcomputer 5
2 turns on the load failure lamp 82 on the front of the case 51 and the warning light 41 at the top of the detection device B, and also sounds the warning buzzer 84. In addition, if the stroke value F is outside the setting range, case 51
Front stroke failure lamp 83 and detection device B
Turn on the warning light 41 at the top of the
Sounds the warning buzzer 84.

If both values E and F are within the set range, each value E and F is printed out by the printing device 81. With the above steps, the inspection when the part of the press plate 73 is pressed is completed.

As an example of inspection, FIG. 8 shows a load (X)-displacement (P-Q) curve when a certain part of the horn switch 73 is pressed. Here, the displacement (P-
The reason why the rate of increase in load suddenly decreases after Q) is 0.2 mm is because the way the spring 74 acts in the horn switch 71 changes.
In the horn switch 71, the stroke value F (displacement R-Q) is 1.9 mm, and the load value E (load D-Y) is approximately
The result was 1.25Kg.

The above inspection was carried out on other parts of the pressing plate 73~
Similarly, if the load value and stroke value are within the set range in all parts, it can be accurately determined that the horn switch 71 is a good product.

As described above, according to this embodiment, it is possible to accurately determine whether the load that must be applied to the pressure plate of the horn switch 71 is an appropriate value, and it is possible to accurately determine whether a large load is required to sound the horn. , it is possible to prevent the problem of the device ringing even if it is lightly touched.

Moreover, the pressing plate 73 in the horn switch 71
Since the stroke of is also within the correction range, after installing the pad part on the horn switch 71,
It is also possible to eliminate the possibility of problems such as constant ringing or non-ringing of the horn.

In addition, the load cell 37 and linear potentiometer 35 are connected to the microcomputer 52 to automatically process load and displacement data at high speed.
Inspection efficiency is also high.

For reference, FIG. 9 shows a load-displacement curve when the test was carried out with the lower end of the contact member 39 sharpened at an acute angle. Here, the reason why the load is disordered at the initial stage of the test is because the tip of the contact member 39 is sliding on the pressing plate 73. In contrast,
Since the contact member 39 of the above embodiment has a flat lower end surface, this slippage does not occur and the behavior of the load can be accurately captured.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, and may be modified and embodied as desired without departing from the spirit of the invention, for example, as described below.

(1) In the above embodiment, the steering wheel 61
Regarding the relative movement between the contact member 39 and the contact member 39, the back and forth movement and the left and right movement are carried out by the steering wheel support device A.
The vertical movement is performed by cylinder 2 of detection device B.
3 and 28, the means of movement in each direction can be changed arbitrarily. For example, movement in all directions may be performed by either support device A or detection device B, or forward/backward movement and left/right movement may be performed by detection device B, and vertical movement may be performed by support device A.

(2) It is also possible to provide the support device A with a drive means such as a cylinder and an automatic control device thereof, so that the steering wheel 61 can be automatically slid back and forth and left and right.

Effects of the Invention As detailed above, according to the present invention, it is possible to determine whether the load and stroke that must be applied to the pressure plate of the horn switch are appropriate values, thereby accurately determining the quality of the horn switch. can be determined. In addition, it not only prevents problems such as requiring a large load to make the horn sound or causing the horn to sound even if it is lightly touched, but also prevents the horn from constantly sounding or malfunctioning after the pad is attached to the horn switch. Not only can you eliminate the risk of problems such as ringing, but
It has excellent effects such as quick measurement operation and reduced measurement errors.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of a horn switch inspection machine embodying the present invention, FIG. 2 is a plan view of a steering wheel to be inspected, FIG. 3 is a bottom view of the steering wheel, and FIG. The figure is a plan view of the horn switch, Figure 5 is a perspective view showing the steering wheel support device of the inspection machine, Figure 6 is a side view of the main parts of the inspection machine, and Figure 7 a, b, and c are the inspection machine. FIG. 8 is a load-displacement curve diagram showing an example of the inspection, and FIG. 9 is a load-displacement curve diagram of a comparative example. 12... Support stand, 15... Support rod, 23... Main cylinder, 28... Sub cylinder, 35... Linear potentiometer, 37... Load cell, 39... Contact member, 52... Microcomputer, 61... Steering wheel, 71... Horn switch, 73...Press plate.

Claims (1)

[Scope of Claims] 1. The steering wheel 6 is protruded from the support base 12 of the jig that supports the steering wheel 61.
a support rod 15 that fits into and contacts the boss hole 6 of No. 1;
Slip spring 68 of steering wheel 61
Detection means for detecting ON/OFF of the contact of the horn switch 71, which is composed of a receiving contact 16 that comes into contact with the horn switch 71 and a contact member 39 that can come into contact with the pressing plate 73 of the horn switch 71 provided on the steering wheel 61; The steering wheel 61 and the contact member 39
Main cylinder 2 for relatively approaching
3, and a sub-cylinder 28 for pressing the contact member 39 against the press plate 73; load measuring means 37, 52 for measuring the load applied to the press plate 73 by the contact member 39; A pressing plate generated by pressing the contact member 39