JP2516628B2 - Hold pin assembly inspection method and device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling inspection method and an inspection device for a hold pin, and more particularly, to an assembled state of a hold pin for pivotally supporting a brake shoe on a back plate in a drum brake device. TECHNICAL FIELD The present invention relates to an inspection method and an inspection device for inspecting.

[Conventional technology]

Prior to the description of the prior art, an assembling structure of a hold pin and a hold cup, which is a prerequisite for the prior art and the present invention, will be described with reference to FIGS. 6 (A) (B) to 9 (A) (B).

First, as shown in FIGS. 6 (A) and 6 (B), the hold pin 1 to be inspected has a head portion 3 having a diameter larger than that of the shaft portion 2 at one end of the shaft portion 2 and other portions of the shaft portion 2. This is a structure having a flat portion 4 whose width is larger than the diameter of the shaft portion 2 at the end.

Further, as shown in FIGS. 7 (A) and 7 (B), the hold cup 5 is formed by pressing a circular plate into a vessel shape, and has a width longer and narrower than the width of the flat portion 4 of the hold pin 1 in the center thereof. This structure has a slit 6 and locking recesses 7 for locking the flat portion 4 on both sides orthogonal to the slit 6.

As shown in FIG. 8, the hold pin 1 and the hold cup 5 use the coil spring 8 together,
This is for pivotally supporting the brake shoe 9 on the back plate 10 in the drum brake device. The assembly structure is such that the hold pin 1 is passed through a mounting hole 11 provided in a back plate 10 as an assembled body and a pivot support hole 12 provided in a brake shoe 9 as an assembled body, and then the brake shoe. With the coil spring 8 interposed between the holding cup 5 and the hold cup 5, the flat portion 4 of the hold pin 1 is passed through the slit 6 of the hold cup 5 so that the slit 6 and the flat portion 4 are substantially orthogonal to each other. This is a structure in which the portion 4 is locked in the locking recess 7.

Then, the inspection as to whether or not the hold pin 1 is correctly locked to the hold cup 5 is conventionally performed by referring to FIG. 9 (A).
As shown in (B), by manually using a detection jig 15 formed by projecting on a reference surface 14 at the tips of a pair of contact pins 13 spaced apart from the thickness of the flat portion 4 of the hold pin 1. I was going.

That is, by aligning the direction of arrangement of the pair of contact pins 13 with the direction of the slit 6 of the hold cup 5, the slit 6
The detection jig 15 is lowered from above. Then, when the hold pin 1 is accurately engaged with the hold cup 5, as shown in FIG. 7, the reference surface 14 contacts the hold cup 5 and the flat portion 4 is interposed between the pair of contact pins 13. And the contact pin 13 falls into the slit 6, the detection jig 15 descends to a predetermined position. Therefore, it can be determined that the assembly is good in this lowered state.

On the other hand, when the flat portion 4 inserted in the slit 6 is not orthogonal to the slit 6 and is not properly engaged,
Even if an attempt is made to lower the detection jig 15, the abutting pin 13 abuts on the flat portion 4 of the hold pin 1 and therefore does not descend.
Therefore, this state can be determined as "improper assembly".

[Problems to be solved by the invention]

However, since the conventional inspection method is manually performed, there is a limit in speeding up the work and labor costs are also required. Further, in the conventional inspection method, even when the hold pin 1 is missing, the reference surface 14 contacts the hold cup 5 and the contact pin 13 falls into the slit 6 as in the case of FIG. 9B. Therefore, it is necessary to visually check the presence or absence of the hold pin 1. This does not make sense to prepare a jig and inspect it.

The present invention has been made in view of the above circumstances, and it is a technical object to provide an inspection method that facilitates automation of an assembly inspection of a hold pin and to provide an automatic inspection device thereof.

[Means for solving problems]

The present invention relates to a hold pin 1 having a head portion 3 having a diameter larger than that of the shaft portion 2 at one end of the shaft portion 2 and a flat portion 4 having a width larger than the diameter of the shaft portion 2 at the other end of the shaft portion 2. And a hold cup 5 having a slit 6 having a width narrower than the width of the flat portion 4 of the hold pin 1, and the flat portion 4 is held by the hold cup 1 after the hold pin 1 is passed through the assembling bodies 9 and 10. 5 through the slit 6 and the slit 6
In the assembly structure in which the flat portion 4 and the flat portion 4 are assembled so as to be substantially orthogonal to each other, the following technical means were taken to inspect the assembled state of the hold pin 1.

According to the inspection method of the present invention, first, when the flat portion 4 of the hold pin 1 is substantially orthogonal to the slit 6 of the hold cup 5, the tip of the detection pin 72 does not contact the tip edge portion of the flat portion 4 and the slit 6 is formed. Along with the depression, the contact portion 74 provided on the detection pin 72 abuts the flat portion 4 so that the depression into the slit 6 is stopped at that point.

Next, when the flat portion 4 of the hold pin 1 penetrates the slit 6 of the hold cup 5 but is not yet orthogonal to the slit 6, the flat portion 4 eccentric from the axis of the hold pin 1 is formed. The tip of the detection pin 72 is brought into contact with the tip edge portion of the.

Further, when the hold pin 1 is missing, the detection pin 72 is made to fall into the slit 6 to the maximum.

Then, the sensor 81 detects the three-step positions of these detection pins 72 to judge the quality of the hold pin 1.

Next, the inspection device for carrying out the method of the present invention will be described. In this device, the detection pin 72 is provided slidably on the guide 71, and the sensor 81 for detecting the position of the sliding detection pin 72 is provided. .

A pair of abutment pins 73 provided at the tip of the detection pin 72 with a spacing wider than the thickness of the flat portion 4 is provided.
In addition, there is provided a contact portion 74 that contacts the flat portion 4 when the flat portion 4 of the hold pin 1 is inserted between the contact pins 73.

Further, a reference surface 76 to be brought into contact with the hold cup 5 is formed at the tip of the guide 71. Further, when the flat portion 4 is assembled so as to be substantially orthogonal to the slit 6 in the state where the reference surface 76 is in contact with the hold cup 5, the contact pin 73 avoids the flat portion 4 and slits. 6 and the flat portion 4 is inserted between the pair of abutment pins 73, the abutment portion 74 abuts the flat portion 4 and the detection pin 72 is stopped at this abutment position. Detection pin by sensor 81
The 72 detection positions are formed as "first detection positions" and this detection state is determined as "installation good".

Further, when the flat portion 4 penetrates the slit 6 of the hold cup 5 but is not yet intersected with the slit 6, the axis of the hold pin 1 is located at the intermediate position between the pair of contact pins 73. Then, the tip ends of the contact pins 73 of the detection pin 72 are brought into contact with both side edge portions of the flat portion 4 which is eccentric from the axis, and in this state, the reference surface of the tip of the guide 71 is held by the hold cup. 5, the detection position of the detection pin 72 by the sensor 81 at that time is set as the "second detection position", and this detection state is determined as "assembly failure".

Further, when the hold pin 1 is missing, the detection pin 72 slides on the guide 71 and moves into the slit 6 without coming into contact with any of them, and the detection of the detection pin 72 by the sensor 81 at this time. The position is the “third detection position”, and this state is formed so as to be judged as “improper assembly”, and the assembly inspection apparatus for the hold pin 1 is provided.

[Action]

In the method and apparatus of the present invention, the position of the detection pin 72 is changed to three levels depending on the three stages, that is, the state in which the hold pin 1 is properly assembled, the state in which it is imperfectly assembled, and the state in which it is missing. Since the position of the detection pin 72 is detected in three stages by means of the above, it is possible to surely detect an improper assembly, and it is also suitable for automation of inspection.

When assembling the assembled bodies 9 and 10 with the hold pin 1 and the hold cup 5, the hold pin 1
Since assembling is possible as long as the flat portion 4 of the above is orthogonal to the slit 6 of the hold cup 5, it is sufficient that at least the slit 6 is provided in the hold cup 5 involved in the inspection object of the method and apparatus of the present invention. The locking recess 7 may not be formed. Further, the coil spring 8 may be used together when assembling the assembled bodies 9 and 10.
In addition to the coil spring 8, another cushioning material such as a rubber bush may be used in combination, and depending on the types of the assembled bodies 9 and 10, such cushioning material may not be used together.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In this embodiment, the hold pin 1, the hold cup 5,
In addition, the device according to the present invention is integrated into an automatic assembling device that automatically performs the process of assembling the brake shoe 9 to the back plate 10 by the coil spring 8. In the description of this embodiment, the structure of the hold pin 1 and the hold cup 5, and the assembling structure of the back plate 10 and the brake shoe 9 by these hold pins 1 and the like are the same as those described in the [Prior Art] section. is there. Since it is necessary to attach two brake shoes 9 to one drum brake device, the hold pin 1
2 sets are required.

First, the automatic assembling apparatus will be described. A conveyor 21 is provided, and the conveyor 21 is provided with a plurality of transfer jigs 22. The back plate 10 on which the brake shoes 9 are set is placed on the carrying jig 22 and carried.

On the transfer jig 22, the brake shoe 9 is placed so that its pivot hole 12 is aligned with the mounting hole 11 of the back plate 10, and the through hole (not shown) is aligned with this mounting hole 11. Are pierced in the transport jig 22.

In addition, a temporary holding jig 23 for temporarily holding the hold cups 5 placed on the coil springs 8 and determining the orientation of the slits 6 of the hold cups 5 is provided on the transfer jig 22. Two are installed. In this temporary holding jig 23, as shown in FIGS. 3A to 3D, a holding column 25 having a diameter slightly smaller than the inner diameter of the coil spring 8 is erected on a pedestal 24 and the holding column 25 is provided. A positioning plate 26 which is formed on the upper surface of the holding cup 5 with a width corresponding to the length of the slit 6 and can be inserted into the slit 6.
Is erected, and the width direction of the positioning plate 26 is directed to the assembling direction of the hold cup 5, so that the direction of the hold cup 5 held therein is determined.

A spring supply device 30 for supplying the coil spring 8, a cup supply device 40 for supplying the hold cup 5, and a pin supply device 50 for supplying the hold pin 1 are sequentially installed from the upstream side along the conveyor 21. .

First, the spring supply device 30 distributes the coil springs 8 aligned by the ball-type parts feeder 31 to the temporary placement table 33 by the distribution device 32 that can move forward and backward, and supplies the two.
Chuck the two coil springs 8 on this temporary stand 33.
It is held by 34 and supplied to two temporary holding jigs 23 provided on the conveyor jig 22 of the conveyor 21.

Next, the cup supply device 40 sorts the hold cups 5 aligned by the ball-type parts feeder 41 and the subsequent linear feeder 42 at regular intervals on the forward / backward sortable table 43, and holds them by the chuck 44, It is mounted on the positioning plate 26 of the temporary holding jig 23 to which the coil spring 8 has already been mounted.

Finally, the pin supply device 50 distributes the hold pins 1 aligned by the general screw part feeder 51 to the two series of air pressure supply pipes 53 by the forward / backward movable distribution device 52, and the respective pressure supply pipes
It is supplied to the first collet chuck 54 at the end of 53. The first collet chuck 54 holds the head portion 3 of the hold pin 1 so that the flat portion 4 faces upward. Then, the direction determining jig 55, which is provided above the first collet chuck 54 so as to rotate and move up and down, is rotated and lowered to move the flat portion 4 of the hold pin 1 to the direction determining jig 55.
Into the groove 56 at the tip of the flat part 4, thereby correcting the orientation of the flat part 4.

Fix the orientation jig 55 and fix the first collet chuck.
54 is formed so as to be rotatable and vertically movable, and the hold pin 1 is raised by the first collet chuck 54 and rotated to insert the flat portion 4 into the groove 56 at the tip of the orientation jig 55. The orientation of the flat portion 4 may be corrected by.

After that, the hold pin 1 is transferred to the second collet chuck 58 by the air chuck 57.

The second collet chuck 58 is the head 3 of the hold pin 1.
The flat portion 4 is held upward, and is installed vertically below the transport jig 22 of the conveyor 21 by the slide cylinder 59 and horizontally rotatable by the rotary drive machine 60. Has been done.

On the other hand, above the conveyor 21, there is a second collet chuck.
An assembling chuck 61 is provided corresponding to 58, and the assembling chuck 61 holds the hold cup 5 and the coil spring 8 held by the temporary holding jig 23 at the same time, and pivots the pivot hole 12 of the brake shoe 9. They are transferred and placed on top. The assembly chuck 61 is integrated with the assembly inspection device for the hold pin 1 according to the present invention.

Hereafter, the hold pin 1 integrated with the assembly chuck 61
The assembly inspection device will be described.

A tubular guide 71 is provided integrally with the assembly chuck 61, and a detection pin 72 is provided in the tubular guide 71 so as to be vertically movable.

At the lower end of the detection pin 72, there is provided a pair of contact pins 73 provided at an interval wider than the thickness of the flat portion 4 of the hold pin 1, and the detection located between the pair of contact pins 73 is performed. The lower end surface of the pin 72 serves as an abutment portion 74 that abuts the flat portion 4 when the flat portion 4 of the hold pin 1 is inserted between the pair of abutment pins 73. Further, a head portion 75 having a diameter larger than the inner diameter of the cylindrical guide 71 is formed at the upper end of the detection pin 72.

On the other hand, at the lower end of the tubular guide 71, the hold cup 5
A reference surface 76 to be brought into contact with is formed and an opening / closing chuck portion 62 of the assembly chuck 61 is provided. Further, a proximity switch 81 as a sensor is provided at the upper end of the tubular guide 71, and the proximity switch 81 is turned on when the head 75 of the detection pin 72 moves up and down, and turns off when the head 75 moves away.
It is what you do.

The assembly chuck 61 and the inspection device can be moved up and down by a transfer device (not shown).

Next, an assembling process using the above-described apparatus and a method for inspecting the assembling of the hold pin 1 will be described.

The conveyor 21 is continuously operated, and the conveyance jig 22 is conveyed by being driven by frictional force. Then, at each station, a stopper (not shown) is projected toward the transport jig side, and the transport jig 22 comes into contact with this stopper and temporarily stops. The conveyor 21 itself may be intermittently driven and temporarily stopped at each station.

The back plate 10 is placed on the carrying jig 22, and the two brake shoes 9 are set on the back plate 10 and carried.

In the middle of this conveyance, first, the coil spring 8 is supplied and mounted from the spring supply device 30 to the holding column 25 of the temporary holding jig 23, and then the positioning plate is installed by the cup supply device 40.
The hold cup 5 is supplied and attached to 26. Next, when the transport jig 22 comes to the pin supply device 50,
61 is operated by the transfer device, and holds the coil spring 8 and the hold cup 5 held by the temporary holding jig 23 and mounts them on the pivot hole 12 of the brake shoe 9, Press and hold to hold cup 5
Is pressed toward the brake shoe 9 side.

At the same time, the second collet chuck 58, which receives and holds the hold pin 1 from the pin supply device 50, is raised by the slide cylinder 59, whereby the hold pin 1 moves through the through hole of the transfer jig 22 and the back plate 10. Mounting hole
11. Passing through the pivot hole 12 of the brake shoe 9, the flat portion 4 thereof penetrates the slit 6 of the hold cup 5. Then, the second collet chuck then rotates 90 degrees, the flat part 4 enters the locking recess 7 of the hold cup 5, and the hold pin 1, the hold cup 5, and the coil spring 8 move the brake shoe 9 to the back plate 10. The pivot is complete.

After this time point, the inspection process for assembling the hold pin 1 is started.

In the inspection step, the reference surface 76 at the lower end of the tubular guide 71 contacts the upper surface of the hold cup 5, and in that state, the detection pin 72
Comes down.

When the flat portion 4 of the hold pin 1 is assembled so as to be substantially orthogonal to the slit 6, the contact pin 73
Avoids the flat portion 4 and falls into the slit 6,
When the flat portion 4 is inserted between the pair of contact pins 73, the contact portion 74 comes into contact with the flat portion 4, and the detection pin 72 is stopped at this contact position. At this time, the head 75 of the detection pin 72
Is in front of the proximity switch 81,
81 is turned on, and the detection position of the detection pin 72 by the proximity switch 81 at this time is set as the "first detection position", and this detection state is determined as "assembly is good".

Next, the flat portion 4 of the hold pin 1 is replaced by the hold cup 5
Although it penetrates the slit 6 of this, it is still this slit 6
When it is not intersected with the contact pin 73, the axis of the hold pin 1 is set to an intermediate position between the pair of abutment pins 73, and the detection pins 72 are provided at both end edge portions of the flat portion 4 which is eccentric from the axis.
The tip ends of the contact pins 73 are in contact with each other.

At this time, since the head 75 of the detection pin 72 passes in front of the proximity switch 81 and moves upward, the proximity switch 81
It remains off. Therefore, the detection position of the detection pin 72 at this time is determined to be the "second detection position", and this detection state is determined to be "improper assembly".

Furthermore, when the hold pin 1 is missing, the detection pin 72 slides on the guide 71 and falls into the slit 6 without coming into contact with any of them, and the head of the detection pin 72 is moved to the proximity switch 81.
Located away from below, proximity switch 81 is off from the beginning
To be maintained. The detection position of the detection pin 72 by the detection switch 81 at this time is set as the "third detection position", and this state is determined as "assembly failure".

In order to judge the quality of the assembly by receiving the ON / OFF signal of the proximity switch 81, the proximity switch 81
When F is set, the buzzer sounds as "Incorrect assembly", and when the proximity switch 81 is ON, the buzzer does not sound as "Good assembly".

As described above, the position of the detection pin 72 can be changed in three stages according to the three stages of the correctly assembled state, the incompletely assembled state, and the missing state of the hold pin 1. Since the position of the detection pin 72 over three stages is detected by the ON / OFF operation of the proximity switch 81, the assembly failure can be surely detected.

Further, in this embodiment, since the hold pin inspection device is integrally incorporated in the device for assembling the brake shoe 9 to the back plate 10 by the hold pin 1 or the like, the quality of the assembling can be judged almost at the same time as the assembling. The assembly and inspection process can be shortened.

Although the proximity switch 81 is used as the sensor in this embodiment, other sensors such as a photo sensor, a magnetic sensor, and an encoder can be used as long as the position of the detection pin 72 can be detected.

〔The invention's effect〕

According to the present invention, the position of the detection pin is detected by the sensor to determine whether the assembly is good or bad. Therefore, the determination can be accurately performed, and the automation can be easily performed.

[Brief description of drawings]

FIGS. 1 (A), (B), (C), and (D) are views showing an inspection process by an apparatus of an embodiment of the present invention, and FIGS. 2 to 4 are views of a brake shoe to a back plate by a hold pin or the like. FIG. 2 is a view showing an assembling process, FIG. 2 is a schematic view showing a coil spring supply device, and FIGS. 3 (A) (B) (C) (D).
Is a perspective view showing a temporary holding jig or a front view showing a state in which a coil spring and a hold cup are attached to the temporary holding jig, and FIG. 4 is a schematic view showing a holding cup supply device,
5 (A), (B), (C), and (D) are schematic views showing a holding pin supply device and an assembling device, and FIG. 6 (A).
(B) is a plan view and a front view showing the hold pin, FIGS. 7 (A) and (B) are a plan view and a longitudinal front view of the hold cup, FIG. 8 is a half-cut sectional view of the drum brake device, and FIG. (A) (B) is a figure which shows the conventional inspection method. 1 ... Hold pin, 2 ... Shaft part, 3 ... Head part, 4 ...
Flat part, 5 ... Hold cup, 6 ... Slit, 9 ...
… Brake shoes as assembly target, 10 …… Back plate as assembly target, 71 …… Guide, 72 ……
Detection pin, 73 ... Contact pin, 74 ... Contact part, 76 ... Reference plane, 81 ... Proximity switch as sensor.

Claims (2)

(57) [Claims] 1. A hold pin 1 having a head portion 3 having a diameter larger than that of the shaft portion 2 at one end of the shaft portion 2 and a flat portion 4 having a width larger than the diameter of the shaft portion 2 at the other end of the shaft portion 2. A holding cup 5 having a slit 6 having a width narrower than the width of the flat portion 4 of the hold pin 1 is provided, and the flat portion 4 is held after the hold pin 1 is passed through the assembled bodies 9 and 10. The slit 6 of the cup 5 is penetrated and the slit 6
When the flat portion 4 of the hold pin 1 is substantially orthogonal to the slit 6 of the hold cup 5 in the assembly structure in which the flat portion 4 and the flat portion 4 are assembled substantially orthogonally to each other, the tip of the detection pin 72 is the tip edge portion of the flat portion 4. The contact portion 74 provided on the detection pin 72 abuts the flat portion 4 so as not to come into contact with the slit 6 and to stop the fall into the slit 6 at that point, and the flat portion of the hold pin 1 is stopped. 4 penetrates the slit 6 of the hold cup 5 but is not yet orthogonal to this slit 6, the tip of the detection pin 72 is attached to the tip edge portion of the flat portion 4 eccentric from the axis of the hold pin 1. Are made to contact each other, and when the hold pin 1 is missing, the detection pin 72 is made to fall into the slit 6 to the maximum.
Hold pin 1 by detecting the 3-step position of
A method for inspecting the assembly of a hold pin, which is characterized by determining the quality of. 2. A hold pin 1 having a head portion 3 having a diameter larger than that of the shaft portion 2 at one end of the shaft portion 2 and a flat portion 4 having a width larger than the diameter of the shaft portion 2 at the other end of the shaft portion 2. A holding cup 5 having a slit 6 having a width narrower than the width of the flat portion 4 of the hold pin 1 is provided, and the flat portion 4 is held after the hold pin 1 is passed through the assembled bodies 9 and 10. The slit 6 of the cup 5 is penetrated and the slit 6
An inspection device for inspecting the quality of the engagement between the hold pin 1 and the hold cup 5 in an assembly structure in which the flat portion 4 and the flat portion 4 are assembled so as to be substantially orthogonal to each other. The detection pin 72 is slidably provided on the guide 71. A sensor 81 for detecting the position of the sliding detection pin 72 is provided, and a pair of abutment pins 73 provided at an interval wider than the thickness of the flat portion 4 is provided at the tip of the detection pin 72. When the flat portion 4 of the hold pin 1 is inserted into the portion between the contact pins 73, the contact portion 74 comes into contact with the flat portion 4
Is provided, and a reference surface 76 to be brought into contact with the hold cup 5 is formed at the tip of the guide 71, and in the state where the reference surface 76 is brought into contact with the hold cup 5, the flat portion is provided. When 4 is assembled so as to be substantially orthogonal to the slit 6, the contact pin 73 falls into the slit 6 while avoiding the flat portion 4, and the flat portion 4 is inserted between the pair of contact pins 73. The contact portion 74 contacts the flat portion 4, and the detection pin 72 is stopped at this contact position, and the detection position of the detection pin 72 by the sensor 81 at this time is set as the "first detection position", and this state is set to "good assembly". ], The flat portion 4 penetrates the slit 6 of the hold cup 5, but when it is not yet orthogonal to the slit 6, the axis of the hold pin 1 is set to the contact pin 73. In the middle position, The tip of each contact pin 73 of the detection pin 72 is brought into contact with both end edge portions of the flat portion 4 which is eccentric from the axis line, and the detection position of the detection pin 72 by the sensor 81 at that time is set to "second detection". Position ”, this detection state is judged as“ improper assembly ”, and when the hold pin 1 is missing, the detection pin 72 does not come into contact with anything and slides on the guide 71 to enter the slit 6. When the sensor 81 moves, the detection position of the detection pin 72 by the sensor 81 at this time is set as the "third detection position", and this state is "improper assembly".
A holding pin assembly inspection device, characterized in that it is formed so as to be judged as.