KR101470878B1 - Inspection equipment and method for return spring of auto clutch - Google Patents

Abstract

The present invention relates to an inspection apparatus and an inspection method for a return spring of an auto clutch. According to the present invention, multiple coil springs assembled with a fixed plate are respectively imaged and the images are read so as to automatically determine the soundness of the assembly state of the coil springs and the defect of the return spring can be automatically inspected. The present invention includes a main body that has a rotating plate and a motor directly or indirectly connected to the rotating plate to rotate the rotating plate; light that is disposed in the main body to protrude to an upper portion of the main body through a central portion of the rotating plate; a camera that is arranged to be positioned in a side surface portion of the main body, is arranged to face the light at the same height between the coil springs provided in the return spring, and images the return spring; a fixing jig that has a circular ring shape for the light to penetrate a central portion, is assembled on the rotating plate to rotate with the rotating plate, and has a circular central protruding portion on an upper surface to be assembled with the return spring after being inserted into the central portion of the return spring; and a control unit that controls the motor and the light and determines the defect of the return spring by reading the image acquired by the camera.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a return spring for an auto clutch,

[0001] The present invention relates to an inspection apparatus and an inspection method for a return spring for an auto-clutch, and more particularly to an inspection apparatus and an inspection method for a return spring for an auto- The present invention relates to an inspection apparatus and an inspection method for a return spring for an auto clutch, which automatically determines whether or not a return spring is defective by automatically determining whether or not the assembled state of the return spring is correct.

The automatic clutch is designed to eliminate the clutch pedal, which requires difficult adjustment in the driving operation of a manual transmission, and to enable the oscillation and gear change by simply pressing the accelerator.

On the other hand, the auto clutch is applied to a semi-automatic transmission or an automatic transmission, and an example of such an auto clutch is disclosed in Korean Patent Publication No. 10-2003-0017156.

1 is a sectional view showing an example of a conventional auto clutch.

The automatic clutch shown in Fig. 1 is a multi-plate clutch used in an automatic transmission. The clutch includes an input shaft 2 of a transmission that receives the rotational power of the torque converter, a clutch (not shown) coupled to the input shaft 2, A clutch plate 6 that is provided on the inner peripheral surface of the clutch retainer 4 and rotates together with the clutch retainer 4 and a clutch plate 6 that is positioned between the clutch plate 6 and the inner side surface is a power transmitting member A piston 12 spline-coupled to the clutch disc 6 and spline coupled to the clutch disc 6 so as to intermittently apply the rotational power of the clutch plate 6 to the clutch disc 8; And a return spring (14) for returning the piston (12) to its original position to release the clutch plate and the clutch disc from each other when released.

2 is a perspective view showing the structure of the return spring.

The return spring 14 is composed of a stationary plate 14a having a ring-shaped structure and a plurality of coil springs 14b assembled to be spaced apart from each other along the circumferential direction of the stationary plate 14a.

On the upper surface of the fixing plate 14a, a plurality of fixing protrusions 14c inserted into the coil spring 14b and coupled with the coil spring are formed.

The return spring is manufactured by a manual method in which the operator inserts the coil springs into the fixing plate. However, since a considerable amount of time is required for assembly of the coil spring and the fixing plate, productivity is reduced. Therefore, And a spring is assembled. An example of such an assembling apparatus is disclosed in Korean Patent Laid-Open Publication No. 10-1997-069806.

The conventional return spring assembling apparatus includes a plurality of coil springs provided from a worker, aligning the positions of the coil springs, and then transferring the coil springs to the assembling positions via the hoses to fix Plate.

However, when a plurality of coil springs are inserted into a return spring assembling apparatus and coil springs of different sizes are mixed and inserted, different types of coil springs are used. There is a problem that it is assembled to one fixed plate, resulting in a failure of the return spring.

In addition, when each of the coil springs is tilted without being accurately assembled in a required posture, the operation of assembling the return spring to the auto clutch can not proceed smoothly.

Therefore, it is required to inspect the return springs that have been manufactured. However, since the worker carries out the inspection manually by the absence of the proper inspection equipment, it takes much time for the inspection and the accuracy of the inspection work is decreased There is a problem.

Korean Patent Publication No. 10-2003-0017156 (Mar. 3, 2003) Korean Patent Publication No. 10-1997-069806 (1997.11.07)

SUMMARY OF THE INVENTION The present invention has been accomplished in view of the above problems, and it is an object of the present invention to provide a coil spring which is capable of capturing an image of a plurality of coil springs assembled on a fixed plate, reading each photographed image, The present invention also provides an inspection apparatus and method for a return spring for an auto clutch that automatically determines whether or not a return spring is defective by automatically determining whether or not a return spring is defective.

According to an aspect of the present invention, there is provided a portable terminal comprising: a main body having a rotating plate and a motor connected directly or indirectly to the rotating plate to rotate the rotating plate; A light installed in the main body so as to protrude from an upper portion of the main body through a central portion of the rotation plate; A camera disposed between the coil springs of the return spring and positioned to face the light at the same height as the light spring, the camera capturing an image of the return spring; A fixing jig having a circular ring structure having the light passing therethrough and assembled on the rotary plate so as to rotate together with the rotary plate and having a circular center protrusion inserted into the center of the return spring and assembled with the return spring; And a controller for controlling the motor, the light, and the camera, and determining whether the return spring is defective by reading an image obtained from the camera.

At least two setting projections protruding upward are formed on the upper surface of the rotary plate, and two or more setting grooves are formed on the bottom surface of the fixing jig so as to correspond to the setting projections, It is preferable that they are bound by the joining of the grooves.

It is preferable that the fixing jig is provided with at least one magnet attached to the return spring and fixing the return spring.

The fixing jig may have a plurality of fixing jigs, and the fixing jigs may have different thicknesses and diameters, so that the fixing jigs can be selectively used according to the size of the return spring.

In addition, the present invention is also characterized in that the height adjusting support is installed inside the main body so as to have a vertically erected structure from the bottom of the main body, and has a rack gear on one side thereof; A movable block coupled to the height adjusting support so as to move up and down along the height adjusting support and having a pinion gear meshing with the rack gear and having an adjusting knob protruded on a side thereof for rotating the pinion gear; And a connecting block connecting the moving block and the light to adjust the height of the light by moving the moving block up and down.

At this time, a ruler may be formed on the height adjusting support and the moving block.

In addition, the present invention provides a method of manufacturing a motor vehicle, comprising the steps of: (S10) assembling and fixing a stationary jig on a rotating plate having a structure rotated by driving of a motor, and arranging a return spring in the stationary jig; (S20) of rotating the rotary plate and the fixing jig so that the center of one of the plurality of coil springs assembled to the return spring coincides with the center of the camera; After the step S20, the motor is driven to rotate the return spring, and the return spring is rotated at a unit angle (360 ° / number of coil springs) corresponding to the number of the coil springs provided in the return spring. A step (S30) of photographing a side image with respect to each coil spring; And the step of reading the diameter, the height, and the tilt of the coil spring received in the image by the control unit is repeated for all the coil springs provided in the return spring to calculate the diameter and height And determining whether the return spring is defective based on the obtained diameter, height, and tilt information of the coil spring. The present invention also provides an auto-clutch return spring inspection apparatus.

According to the present invention having the above-described features, there is an effect that the time required for the inspection work can be shortened by automating the inspection work on the return spring, and the reliability of the inspection result can be improved.

1 is a sectional view showing an example of a conventional auto clutch,
2 is a perspective view showing the structure of a return spring,
3 is a front view of a return spring testing apparatus according to a preferred embodiment of the present invention.
4 is a plan view of a return spring inspection apparatus according to a preferred embodiment of the present invention,
FIG. 5 is a side view of a return spring testing apparatus according to a preferred embodiment of the present invention,
FIG. 6 is a front view showing a combined structure of a height adjusting support and a moving block according to the present invention. FIG.
FIG. 7 is a plan view showing a coupling structure of a height adjusting support and a moving block according to the present invention,
8 is a perspective view showing a structure of a rotating plate and a fixing jig according to the present invention,
9 is a side view of the coil spring taken by the camera of the present invention,
10 is a view showing a process of reading a coil spring located in an inspection region of a side image of a coil spring,
11 is a view illustrating an image reading process for determining whether a return spring is defective,
12 is a screen of a test result using the test apparatus according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 3 is a front view of a return spring testing apparatus according to a preferred embodiment of the present invention, FIG. 4 is a plan view of a return spring testing apparatus according to a preferred embodiment of the present invention, FIG. 6 is a front view showing a combined structure of a height adjusting support and a moving block according to the present invention, FIG. 7 is a plan view showing a coupling structure of a height adjusting support and a moving block according to the present invention, 8 is a perspective view showing the structure of the rotating plate and the fixing jig of the present invention.

The return spring testing apparatus for an auto-clutch according to the present invention includes a return spring for an auto clutch comprising an annular fixed plate 14a and a plurality of coil springs 14b assembled to the fixed plate 14a, The light source 120, the camera 130, the fixing jig 140, and the control unit 130. The main body 110, the light 120, the camera 130, the fixing jig 140, (150).

The main body 110 supports a rotating plate 111 and a motor 112 for rotating the return spring, and is formed in a box shape of a hexahedron.

The rotating plate 111 is disposed on the upper surface 110a of the main body 110 and is rotatably supported by a bearing 113 provided in the main body 110. [

The motor 112 is installed inside the main body 110 and connected to the rotating plate 111 via a pulley and a belt to rotate the rotating plate 111. An encoder 114 connected to the motor shaft of the motor 112 and detecting the rotation angle of the motor 112 is provided inside the main body 110.

A maintenance door 115 is formed on one side of the main body 110 to open the main body 110 when parts inside the main body 110 are required to be replaced or repaired.

The light 120 provides illumination to enable the camera 130 to acquire a more pronounced image and is arranged to face the camera 130 with a coil spring therebetween.

That is, the light 120 passes through the central portion of the rotary plate 111 to smoothly provide illumination without interfering with the rotating rotary table 111, the fixed jig 140, and the return spring, As shown in FIG. The light 120 protrudes to the upper portion of the main body 110 to have the same height as the camera 130.

A height adjusting support 121, a moving block 122 and a connecting rod 123 are further installed on the main body 110 so that the height of the light 120 can be controlled by the user.

The height adjustment support base 121 is installed in a structure in which a lower end is fixed to the inner bottom of the main body 110 and has a structure vertically erected from the inner bottom of the main body 110. A guide bar 1211 extending in the vertical direction is formed on one side of the height adjusting support 121 and a rack gear 1212 extending in the vertical direction is formed on a side surface of the guide bar 1211.

The moving block 122 is coupled to the height adjusting support 121 so as to have a structure capable of moving up and down while being coupled to the height adjusting support 121. The pinion gear 1221 is meshed with the rack gear 1212 and is disposed at an inner center portion of the pinion gear 1221. The pinion gear 1221 is coupled to the guide bar 1211, So that the pinion gear 1221 is rotated. The adjustment knob 1222 is protruded from the side surface.

The upper end of the link 123 is fixed to the light 120, and the lower end of the link 123 is fixed to the moving block 122.

According to this structure, when the user rotates the adjustment knob 1222, the pinion gear 1221 engaged with the rack gear 1212 rotates to move the movable block 122 up or down, 122 and the light unit 120 coupled to each other through the link 123 are raised or lowered together to adjust the height of the light unit 120.

A ruler 124 is formed on the height adjusting support 121 and the moving block 122 so that the height of the light 120 can be adjusted in a state in which the user correctly recognizes the height of the light 120.

The camera 130 photographs an image of a coil spring included in the return spring and is installed at a side portion of the main body 110. The camera 130 includes a light 120 As shown in Fig. The camera 130 installed in this way captures an image of the side of the return spring placed on the fixing jig 140, that is, the side of the coil spring.

The camera 130 may be installed on the main body 110 or on a separate support base 131 and the camera 130 may be installed on a separate support base 131.

The fixing jig 140 is coupled to the rotary plate 111 to support the return spring. The fixing jig 140 has a circular ring structure for allowing the light 120 to pass therethrough. The fixing jig 140 is inserted into the center of the return spring, A circular central protrusion 141 for supporting the spring is formed.

In order to allow the fixing jig 140 to smoothly rotate together with the rotary plate 111 without slipping, two or more setting projections 1111 are formed on the upper surface of the rotary plate 111 and correspond to the setting projections 1111 Two or more setting grooves 142 are formed on the bottom surface of the fixing jig 140. As shown in Fig.

One or more magnets 143 are embedded in the upper surface of the fixing jig 140 to increase the coupling between the return spring and the fixing jig 140 placed on the fixing jig 140.

The fixing jig 140 may include a plurality of fixing jigs 140. The plurality of fixing jigs 140 may be configured to be coupled to return springs of different sizes with different thicknesses and diameters, The fixing jig 140 suitable for the inspection work is selected and mounted on the rotary plate 111 in consideration of the height.

The control unit 150 controls the motor 112, the light 120, and the camera 130, and determines whether the return spring is defective by reading an image obtained from the camera 130, It is determined whether or not the return spring is defective by reading the height, diameter, and slope of the coil spring, and comparing the read height, diameter, and slope with preset reference values.

The control unit 150 may include a display 151 that displays the result of the return spring inspection on the screen.

A description will now be made of an inspection method of a return spring for an auto clutch according to the present invention, which is implemented using the above-configured return spring testing apparatus for an auto clutch.

The method for inspecting the return spring for an auto-clutch according to the present invention includes assembling the fixing jig 140 on the rotary plate 111 having a structure rotated by driving the motor 112, (S10); After the step S10, the rotation plate 111 and the fixing jig 140 are rotated so that the center of one of the plurality of coil springs assembled to the return spring coincides with the center of the camera 130, (S20); After the step S20, the return spring is rotated, and the return spring is rotated at a unit angle (360 ° / number of coil springs) corresponding to the number of the coil springs provided in the return spring. A step S30 of photographing a side image of the coil spring of the coil spring; And a process of reading the height, diameter, and slope of the coil spring, which is received by the controller 150, in the image captured in step S30, is repeated for all the coil springs provided in the return spring, (S40) of obtaining height, diameter, and tilt information, and determining whether the return spring is defective based on height, diameter, and tilt information of the obtained coil spring.

In the step S10, a return spring, which is required to be inspected, is installed on the main body 110, and the appropriate fixing jig 140 is selected in consideration of the diameter and height of the return spring. The central jig 140 is provided with a central protrusion 141 having an outer diameter corresponding to the inner diameter of the return spring so as to prevent the return spring from flowing during the rotation of the return jig 140, The fixing jig 140 having an appropriate height is selected so as to be positioned at the same height as the camera 130.

The fixed jig 140 thus selected is assembled on a rotating plate 111 provided on the main body 110. The fixing jig 140 is assembled to the rotary plate 111 so that the setting protrusion 1111 formed on the rotary plate 111 is inserted into the setting groove 142 formed in the fixing jig 140, 140 are mutually coupled and rotated together.

The return spring installed on the stationary jig 140 is attached to the magnet 143 provided on the stationary jig 140 so that the return spring of the stationary jig 140 And is rotated together with the fixing jig 140 when rotating.

Meanwhile, the user inputs the return spring to the fixing jig 140, and inputs the specification information such as the number, the height, and the diameter of the coil spring of the return spring to the controller 150.

In step S20, the center of the coil spring of the plurality of coil springs is aligned with the center of the camera 130, that is, the center of the image captured by the camera 130 As shown in FIG. Of course, the rotation of the return spring is performed by the rotation of the rotating plate 111 and the fixing jig 140 by the driving of the motor 112.

In step S20, an image of the coil spring is photographed using the camera 130 while rotating the return spring, and the photographed image is read to set the initial position of the examination.

More specifically, the step S20 includes the step S21 of photographing a side image of the return spring at a predetermined time interval while rotating the return spring. (S22) the control unit 150 reads the image photographed in step S21 in real time and determines whether the coil spring is located at the center of the image and the central part of the coil spring located at the center of the image coincides with the center of the image. If the central portion of the coil spring coincides with the central portion of the image in the step S22, the position of the coil spring is set to the inspection initial position (S23); And repeating the steps S21 and S22 if the coil spring is not located at the center of the image or the central portion of the coil spring does not coincide with the center of the image in operation S22.

Meanwhile, a process of reading the image by the control unit 150 in step S22 will be briefly described.

FIG. 9 shows a side view of a coil spring taken by a camera of the present invention, and FIG. 10 shows an example of a process of reading a coil spring located in an inspection region of a side image of a coil soup.

The control unit 150 sets a rectangular inspection area S at the center of the photographed image and detects a lightness and darkness value of a pixel located in the inspection area S to detect a pixel whose pixel changes from white to black The coil spring located within the inspection area can be read. For reference, the inspection area S is always set at a constant position regardless of the image.

That is, the controller 150 moves the lightness and darkness values of the pixels located in the inspection area S from the left to the right of the inspection area and detects the pixels whose lightness values change from white to black, By repeating the movement from the upper side to the lower side, a plurality of pixels corresponding to the shape of the left side of the coil spring are detected.

The X-axis coordinate of the detected plurality of pixels is decreased and the inflection point is increased again to be the peak point Pl of each winding number, and a straight line L1 connecting the pitch points Pl of the winding number thus specified is detected The detection operation for the left side of the coil spring is completed.

Thereafter, by detecting the right winding number peak point Pr of the coil spring on the basis of the above-described principle and detecting the straight line L2 connecting these peak points Pr, the detection operation on the right hand side of the coil spring is completed do.

The distance D1 between the left side of the inspection area and the straight line L2 corresponding to the left side of the coil spring detected through the above process is smaller than the distance D1 between the left side of the inspection area and the straight line L2 corresponding to the right side of the coil spring, It is possible to judge whether or not the central part of the coil spring coincides with the center part of the image by comparing the distances D2 from the right side.

In the step S23, the straight lines L1 and L2 corresponding to the left and right sides of the coil spring are compared with distances D1 and D2, respectively, which are spaced apart from the left and right ends of the inspection region, It is determined that the central portion of the coil spring is located at the center of the image and the corresponding position is set as the inspection initial position.

If it is determined that the central portion of the coil spring does not coincide with the central portion of the image, step S24 is repeated.

On the other hand, the image reading method described above exemplifies one of the practicable reading methods. Since various image reading techniques have already been used, the present invention is not limited to the above-described reading method, The position of the coil spring can be detected, and the inspection initial position can be set based on the detection result.

The step S30 is a step of photographing a side image of each coil spring while rotating the return spring 360 degrees.

In step S30, the return spring is rotated stepwise by a unit angle (360 ° / number of coil springs) corresponding to the number of coil springs provided on the return spring, and the camera 130 is used And taking side images of the respective coil springs.

In step S40, the side image of the coil spring photographed by the camera 130 is read to determine whether or not the coil spring is assembled to the fixing plate, whether or not the coil spring of another standard is assembled to the fixing plate, To check whether it is assembled to the fixing plate.

More specifically, in step S40, the control unit 150 receives a side image of each coil spring photographed by the camera 130, and the control unit 150 reads each image to determine the height and diameter of the coil spring And determines whether or not the return spring is defective by using the detected information of the coil spring.

More specifically, the control unit 150 sets an inspection area at the center of the image, detects a light / dark value of a pixel located in the inspection area, and detects a pixel whose pixel changes from white to black, Information about the user.

FIG. 11 shows an example of a process of reading an image for determining whether or not a return spring is defective.

The control unit 150 moves the lightness and darkness values of the pixels located in the inspection region S from the upper side to the lower side of the inspection region and detects a pixel whose lightness value changes from white to black, The straight line L3 connecting the detected plurality of pixels Pt is detected at a distance from the lower side of the inspection area (D3) corresponds to the height information of the coil spring.

10, a pitch line Pl of each winding number located on the left side of the coil spring is detected to detect a straight line L1 corresponding to the left side of the coil spring, and the right side of the coil spring And detects a straight line L2 corresponding to the right side of the coil spring and detects the distance between the two straight lines L1 and L2 as the diameter value of the coil spring And the average value of the slope of the two straight lines is designated as the slope value of the coil spring.

Accordingly, the control unit 150 compares the height, diameter, and slope of the coil spring detected as described above with reference values previously input for determination of the sum of the coil springs, thereby determining the sum of the coil springs.

The control unit 150 repeats the above procedure for each coil spring to determine whether or not any of the coil springs is defective. If it is determined that any of the coil springs is defective, the control unit 150 determines that the return spring is defective .

On the other hand, in the case where the coil spring is not assembled on the fixing plate and is missing, the coil spring is not detected in the inspection area of the image photographed by the camera 130, and in this case also, the return spring is judged to be defective .

On the other hand, when it is determined that the return spring is defective, the control unit 150 displays the return spring as defective through the display 151, and FIG. 12 shows a test result screen using the inspection apparatus according to the present invention Respectively.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
110: main body 111: spindle
1111: setting protrusion 112: motor
120: light 121: height adjustment support
1212: Rack gear 122: Moving block
1221: Pinion gear 1222: Adjusting knob
123: Connecting rod 124: Ruler
130: camera 140: fixed jig
141: central protrusion 142: setting groove
143: magnet 150:

Claims (8)

A main body 110 having a rotating plate 111 and a motor 112 directly or indirectly connected to the rotating plate 111 to rotate the rotating plate 111;
A light 120 installed in the main body 110 so as to protrude from the upper portion of the main body 110 through a central portion of the rotation plate 111;
A camera 130 disposed between the coil springs provided on the return spring and disposed to face the light 120 at the same height as the light guide 120,
The light 120 has a circular ring structure so as to penetrate the central portion thereof. The light 120 is assembled on the rotary plate 111 to rotate together with the rotary plate 111, and inserted into the center portion of the return spring, A fixing jig 140 having a protrusion 141 formed on an upper surface thereof; And
The control unit 150 controls the motor 112, the light 120, and the camera 130 to read an image obtained from the camera 130 and determine whether the return spring is defective or not. Test device for return spring for auto clutch. The method according to claim 1,
At least two setting projections 1111 protruding upward are formed on the upper surface of the rotating plate 111,
Wherein two or more setting grooves (142) are formed on the bottom surface of the fixing jig (140) to correspond to the setting projections (1111). The method according to claim 1,
Wherein the fixing jig (140) is provided with at least one magnet (143) attached to a return spring for fixing a return spring. The method according to claim 1,
The fixing jig 140 may include a plurality of fixing jigs 140. The fixing jigs 140 may have different thicknesses and diameters so that the fixing jig 140 can be selectively used according to the size of the return spring. Return spring test device for clutch. The method according to claim 1,
A height adjustment support 121 installed inside the main body 110 to have a structure vertically erected from the bottom of the main body 110 and having a rack gear 1212 on one side thereof;
A pinion gear 1221 coupled to the height adjusting support 121 for moving up and down along the height adjusting support 121 and meshing with the rack gear 1212 is provided on the inner side of the pinion gear 1221, A moving block 122 in which a rotating adjusting knob 1222 is protruded to the side; And
And a linking part 123 connecting the moving block 122 and the light 120 to adjust the height of the light 120 by moving the moving block 122 up and down. Return spring inspection device. The method of claim 5,
Wherein a scale (124) is formed on the height adjustment support (121) and the moving block (122). (S10) assembling and fixing the fixing jig 140 on the rotary plate 111 having a structure rotated by driving the motor 112 and arranging the return spring in the fixing jig 140;
After the step S10, the rotation plate 111 and the fixing jig 140 are rotated so that the center of one of the plurality of coil springs assembled to the return spring coincides with the center of the camera 130, (S20);
After the step S20, the motor 112 is driven to rotate the return spring, and the return spring is rotated at a unit angle (360 ° / coil spring number) corresponding to the number of the coil springs provided in the return spring, (S30) of photographing a side view of each coil spring using the coil spring 130; And
The control unit 150 receives the side image photographed in step S30 and reads the diameter, the height, and the tilt of the coil spring located in the image. The process of repeating the process for all the coil springs provided in the return spring, And a step (S40) of obtaining the height and tilt information, and determining whether the return spring is defective based on the obtained diameter, height, and tilt information of the coil spring (S40) . The method of claim 7,
In operation S20,
(S21) photographing a side image of the return spring at a predetermined time interval while rotating the return spring;
(S22) the control unit 150 reads the image photographed in step S21 in real time and determines whether the coil spring is located at the center of the image and the central part of the coil spring located at the center of the image coincides with the center of the image.
If the central portion of the coil spring coincides with the central portion of the image in the step S22, the position of the coil spring is set to the inspection initial position (S23); And
And repeating the steps S21 and S22 if the coil spring is not located at the center of the image or the central portion of the coil spring does not coincide with the center of the image at the step S22. Return spring inspection method.

Images