JPH0518054B2 - - Google Patents

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting sealing rubber applied to a peripheral seaming panel portion of a can lid for rubber coating defects such as leaks and skips. BACKGROUND TECHNOLOGY Sealing rubber is applied to the seaming panel portion of can lids, which corresponds to the position where they are wrapped around the can body, in order to seal the can lid with the can body. If the rubber coating is defective, the airtightness and watertightness of the manufactured can will be impaired, so inspection of the rubber coating is an essential step in the lid manufacturing process, and precise inspection is required. Conventional rubber inspection is performed by installing a detector on a conveyor 50 after passing through a dryer, as shown in FIG. 9, to detect defects in rubber coating. In the above-mentioned conventional device, the detectors 54 to 57, which are integrated with a light emitter and a light receiver, are connected to a conveyor 50.
Four permanent magnets 53 are fixed in series on the top of the conveyor guides 51 and 52, and the can lids W being conveyed on the conveyor are brought into sliding contact with the guide 51 side. While rotating, rubber coating defects are detected at four points. Problems to be Solved by the Invention In the above-mentioned conventional technology, coating defects are detected after the product passes through the dryer, but at the time of detection, rubber has already been applied to more than 4,000 can lids using liners. Therefore, if a coating defect is caused by a liner nozzle or the like, a large number of defective lids with coating defects have already been produced at the time of detection, resulting in a large loss. Further, since only four points can be detected around the entire circumference of the can lid, precise inspection is not possible, and defective lids may be mixed in with good lids by overlooking coating defects. SUMMARY OF THE INVENTION In order to eliminate the drawbacks of the prior art, the present invention detects can lids immediately after rubber application, thereby preventing the occurrence of a large number of defective lids due to poor rubber application. In a sealing rubber applicator that can accurately detect coating defects by continuously detecting the entire circumference of the sealing rubber, completely eliminate the possibility of defective lids being mixed with good lids, and that has a plurality of coating stations, An object of the present invention is to provide a sealing rubber inspection device that can instantly determine in which coating station a coating defect occurs. Means for Solving the Problems The can lid sealing rubber inspection device of the present invention which solves the above problems is installed at each application station of a liner head disc having a plurality of application stations for applying sealing rubber to can lids. a detection device that detects the application state of the sealing rubber that has been applied, a coating defect occurrence station display means that displays the sealing rubber application station where the coating defect has occurred, and a control start of inspection of the can lid at the coating station that reaches the monitoring area. A monitoring timing cam that rotates in synchronization with the liner head disk, and a monitoring timing sensor that detects the monitoring timing cam. and a shift sensor that detects the shift cam. The above-mentioned means for indicating the station where a coating defect has occurred may be an appropriate display, such as providing an indicator lamp corresponding to each coating station, and displaying an indication by the indicator lamp corresponding to the corresponding coating station when a coating defect has occurred. means can be adopted. Operation: The can lid, which is attached by a rotatable chuck in the pocket of each application station of the liner head disc, is coated with rubber on the seaming panel portion while rotating with the rotation of the liner head disc. When the can lid approaches the monitoring area while the rubber is being applied, the register is shifted by the shift cam of the timing cam rotating in synchronization with the liner head disk, and then the corresponding pocket is moved by the monitoring timing cam. As soon as the rubber is sensed, a rubber inspection is started using the detection device of the corresponding pocket. The can lid is rotated and inspected by a detection device within the monitoring area, and if the reflected light from the phototube device is above a certain level, the control section determines that the coating is defective.
At the same time as the driving of the liner is stopped, the indicator lamp corresponding to the station where the coating defect has occurred is lit to display the station where the coating defect has occurred. Embodiments Hereinafter, embodiments of the inspection method and apparatus of the present invention will be described with reference to FIGS. 1 to 8. FIG. 1 schematically shows an apparatus for applying sealing rubber to a can lid to which the present invention is applied. Reference numeral 2 denotes a liner head disk, on which four coating stations No. 1 to No. 4 (hereinafter simply referred to as stations) are arranged at 90° intervals. The can lids are stored in a hopper H, taken out one by one by supply turrets F and T, and supplied to pockets 10 (FIG. 4) of each station on the liner head disc 2. The can lid supplied to the pocket 10 is held by the upper pad 12 and lower pad 13 inside the pocket, and rotates and revolves around the seaming panel.
Sealing rubber Wl is applied to Wc. The coated can lid is taken out by the dryer turret D/T and sent to the dryer. The above is
It is similar to a conventional sealing rubber application device for can lids. The present invention provides a detection device PH ₁ for detecting a coating failure of the sealing rubber (hereinafter simply referred to as rubber) Wl applied to the seaming panel Wc of the can lid, corresponding to each station of the liner head disc 2 in the above-mentioned device. - PH ₄ are provided, and a timing cam 20 for controlling the operation of the above-mentioned detection device is also provided on the shaft of the dryer turrets D and T. Figures 2 to 4 show how the detection devices PH ₁ to _{PH 4} are attached to the liner head.
Only one station part is stored. In the figure, 1 is a liner main shaft structure, and the liner main shaft structure, a liner head disk 2, and an upper disk 3 rotate together. The liner head disc 2 is provided with a pocket 10 equipped with a chuck device consisting of an upper pad 12 and a lower pad 13, and the chuck device can hold and rotate a can lid. In addition, the liner head has 1 pocket each.
A rubber application gun 5 is provided corresponding to the rubber application gun 5, and the pocket 10 and the rubber application gun (hereinafter simply referred to as application gun) 5 constitute a rubber application station. The detection devices PH ₁ to _{PH 4} are composed of a photoelectric sensing device 6 which is a light emitter and a light receiver integrated, a detection head 9, and a fiber 7 that connects the two and conducts light. The photocell device 6 is attached via a bracket 14 to a support 4 which is suspended and fixed to an upper disk 3 which rotates together with the liner main shaft structure 1. Further, the detection head 9 is attached to the main shaft structure 1 via a bracket 8 at a position corresponding to the seaming panel portion Wc of the can lid W, as shown enlarged in FIGS. 3 and 4. ing. Next, a timing cam for controlling the operation of the detection device will be explained with reference to FIGS. 5 to 7. 20 is a timing cam, and the timing cam has a circumference divided into two and a small diameter portion.
3 and 24 are arranged 90 degrees out of phase, and four shift cams 22 with lids, which are shift cams with a slight width, are arranged around the positions corresponding to the steps of each cam at the top. There is. The cams 23 and 24 constitute a monitoring timing cam 21 that controls the inspection timing of each station, and the shift cam 22 with a lid is a cam that shifts a shift register that stores the station number under inspection. The timing cam 20 is fixed by a bolt 32 through a fitting hole 33 in the upper part of a dryer turret shaft 30 which rotates in synchronization with the liner head disc. 25 and 26 are monitoring timing sensors arranged corresponding to the monitoring timing cam 21;
27 is a sensor for a shift cam with a lid. These sensors are mounted on bracket 3 in the liner head.
It is attached and fixed by 1. The monitoring timing cam 21 can extract four types of signals by combining the circular cams 23 and 24 having a small diameter step part, shifted by 90 degrees, so the positions can be set to No. 1 to No. If the station is placed in correspondence with the station No. 4, that station can be identified by the signals from the monitoring timing sensors 25 and 26. The relationship between each station and the above-mentioned monitoring timing cam is as shown in the following table, assuming that the sensor operates in the large diameter part of the cam and its signal is 1, and the signal in the small diameter part is 0. according to the table

[Table] FIG. 8 shows the monitoring area of each station in correspondence with the output of each sensor. In addition, in the above table and FIGS. 7 to 8,
P and B are monitoring timing sensors that detect the cam 23, P and A are monitoring timing sensors that detect the cam 24, and P and C are lidded shift cam sensors that detect the lidded shift cam 22, respectively. ing. The chuck device in each pocket 10 on the liner head disc is configured to rotate five times after being supplied with the can lid W from the supply turrets F and T until it is discharged to the dryer turrets D and T.
During this time, rubber application and detection are performed, and the timing is as shown in the table below.

[Table] That is, the rubber defect detection by the detection unit is performed continuously during two rotations of the can lid in the pocket, from just before the end of the third rotation to just before the end of the fifth rotation. Further, on the front panel of the control device (not shown), the station No. 1 that is currently being inspected is displayed based on the signal from the monitoring timing sensor that detects the monitoring timing cam 21 of the timing cam 20.
There are four indicator lamps No. 4, a break alarm lamp for the phototube device of each station, a defect indicator lamp and a coating defect alarm lamp that indicate a station with a coating defect based on a signal from the detection unit. It is being The overall operation of the apparatus configured as described above will now be described, focusing on the operation when a rubber coating failure occurs. The can lid W held in the pocket 10 of the liner head disk 2 is coated with rubber by a coating gun in its seaming panel portion and rubber coating area while rotating and revolving in the pocket 10. During this time, the can lid is rotated three times in the pocket so that the rubber is evenly applied. When the pocket 10 reaches the position just before the monitoring area, the lid shift sensor 27 is activated by the lid shift cam, the shift register is shifted, and the lighting of the inspection indicator lamp on the front of the control panel is shifted. Immediately thereafter, the monitoring timing cam 21 activates the detection section of the station that has reached the monitoring area, and starts rubber inspection of the can lid of the station (see FIG. 8). If there is a coating defect such as rubber coating leakage or skipping,
The light emitted from the phototube device 6 is strongly reflected,
When the amount of reflected light reaches a reference setting value or more, a warning lamp indicating a coating failure is displayed, and at the same time, a lamp indicating a coating failure station is lit, and the operation of the apparatus is stopped. After removing the defective can lid, repair the part that caused the coating failure and restart the operation. In addition, in the detection section of the present device, the phototube device and the detection head are connected through a fiber, so the detection end can be brought closest to the detection point, and disturbances caused by external light can be minimized. It is possible to perform accurate detection. Effects of the Invention As described above, the present invention installs a rubber coating defect detection unit at each station of the liner and detects it immediately after rubber coating, thereby eliminating the need to generate a large number of defective can lids as in the past. Even in the worst case, it is possible to keep the number of sheets within 10, which is extremely economical. Furthermore, since the can lid is detected while being rotated within the pocket, the entire circumference can be inspected, allowing for precise inspection. Therefore, there is no possibility that a can lid with defective rubber coating will be mixed into a good lid due to an inspection failure, and the inspection accuracy is dramatically improved. Furthermore, since the station where a coating defect occurs is immediately displayed, prompt treatment can now be taken.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an apparatus for applying sealing rubber to can lids to which the present invention is applied, Fig. 2 is a partial front view of the liner head section, Fig. 3 is a plan view of the pocket section, and Fig. 4 is a side view of Fig. 3, Fig. 5 is a perspective view of the monitoring timing cam part of the timing cam,
FIG. 6 is a plan view of the timing cam, FIG. 7 is a front view showing how the timing cam is attached, FIG. 8 is a time chart of the timing cam, and FIG. 9 is a plan view of a conventional example. 1: Liner main shaft structure, 2: Liner head disk, 5: Rubber application gun, 6: Phototube device, 7:
Fiber, 9: detection head, 10: pocket,
12, 13: Chuck device, 20: Timing cam, 21: Monitoring timing cam, 22: Shift cam with lid, 27: Monitoring timing sensor, 2
5, 26: Monitoring timing sensor, 30: Dryer turret shaft, W: Can lid, PH ₁ ~
PH ₄ : Detection section.

Claims (1)

[Claims] 1. A detection device for detecting the application state of sealing rubber installed at each application station of a liner head disk having a plurality of application stations for applying sealing rubber to can lids, and a detection device for detecting the application state of sealing rubber where a defective application has occurred. a means for displaying a station where a coating defect has occurred;
It consists of a monitoring timing cam that controls the start of inspection of the can lid at the coating station that reaches the monitoring area, and a shift cam that shifts a shift register that stores the station under inspection, and rotates in synchronization with the liner head disk. A can lid sealing rubber inspection device comprising a timing cam that detects the monitoring timing cam, a monitoring timing sensor that detects the monitoring timing cam, and a shift sensor that detects the shift cam.