JPS637845Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inspection device for inspecting whether or not the opening side seam flange of an empty can is abnormal.

One of the defects that occur during the manufacturing process of canned goods is poor seaming. This is caused by an external impact being applied to the empty can before it is filled and sealed, or by collision between empty cans, which deforms the opening side seaming flange that is expanding outward. It is something that occurs. When the flange is seamed in a deformed state in this way, a protruding portion A occurs as shown in Figures 1 and 2b, causing false seaming.
Compared to the normal seaming shown in FIG. 2a, even if the can can be temporarily sealed, it will eventually become a defective can. In order to prevent such false seaming, it is necessary to check for abnormalities in the flange immediately before filling and seaming, but conventionally, inspection is done visually, which can easily lead to oversights or removal errors. be. Therefore, it has been considered to perform inspection using an optical inspection device, but this has the disadvantage that it is difficult to distinguish between light incident on the light receiver in normal times and light incident in abnormal times, making it easy to make inspection mistakes. Furthermore, the light must be projected evenly onto the opening side seam flange,
Arranging a large number of lamps in a ring would be expensive, and it would be difficult to replace the lamps when they burn out. One idea would be to install a ring-shaped fluorescent light, but the socket of this fluorescent light would be dark, so it could not be used as is.

Therefore, the present invention provides an empty can inspection device that solves these problems, and its features are that an inspection head is disposed above the inspection position on the empty can transport path, and A hole with a diameter larger than that of the empty can is formed in the bottom plate, a hood is placed in the center of the hole, and an annular groove is placed directly above the flange of the opening side of the empty can brought to the inspection position of the hood. A large number of light-receiving sensors are arranged at appropriate intervals in the annular groove, and the sensor is arranged inside the inspection head and passes through the hole in the bottom plate of the inspection head to the flange of the opening side seam part. An annular fluorescent lamp is provided that emits an annular light beam from obliquely above the flange along the direction of the inscribed line of the flange, and a mirror is provided inside the socket of the fluorescent lamp to reflect the light toward the opening side seam flange. According to this configuration, an annular luminous flux is emitted from the annular fluorescent lamp along the direction of the inscribed line of the flange, so when the flange is normal, the above luminous flux goes straight and reaches the light receiving sensor. will not receive light. In addition, the light beam that has traveled straight is reflected off the inner surface of the empty can and tries to enter the light receiving sensor, but since each light receiving sensor is arranged in an annular groove, that light is blocked by the hood, and the reflected light is never enters the light receiving sensor. Therefore, there will be no error when something is abnormal even though it is normal. Further, when the flange is abnormal, the above-mentioned luminous flux hits the abnormal part of the flange and is reflected, and enters the light receiving sensor. Therefore, abnormalities in the flange can be reliably detected. Furthermore, since an inexpensive annular fluorescent lamp is used as the light source, it is economical and easy to replace. Furthermore, a mirror is placed inside the socket of the annular fluorescent lamp, so the socket does not become dark.

Hereinafter, one embodiment of the present invention will be described based on FIG. 3 and the following figures. Reference numeral 1 denotes an inspection head, and a circular hole 2 having a larger diameter than the empty can 8 is formed in the bottom plate. 3 is a disc-shaped hood whose lower end is inserted into the center of the circular hole 2, and the tips of a plurality of arms 4 protruding from the outer circumferential surface are placed and fixed on the bottom plate of the inspection head 1. . Numeral 5 is an annular groove formed directly above the opening-side seam flange 8A of the empty can 8 brought to the inspection position on the lower surface of the hood 3, and 6 is a plurality of annular grooves arranged at appropriate intervals within the annular groove 5. The light receiving sensor 9 is disposed in the inspection head 1 via the holder 10, and is inserted into the flange 8A through the circular hole 2 from diagonally above the flange 8A along the substantially inscribed direction of the flange 8A. An annular fluorescent lamp 11, which emits an annular luminous flux, is a mirror fixed on the bottom plate of the inspection head 1 inside the socket 9A of the fluorescent lamp 9, and reflects the light toward the flange 8A. 7 is a plug. It is assumed that the fluorescent lamp 9 is lit with direct current or with a high frequency power source to prevent flickering. 1
2 is a conveyor for transporting empty cans 8 that moves in the direction of arrow A. In FIG. 5, 13 indicates each light receiving sensor 6.
It is an amplifier that amplifies the input signal from the sensor, and has a sensitivity adjustment function to keep the sensor sensitivity level constant. Reference numeral 14 is a detection level setting device according to the can type and the brightness of the light source, and the detection level light receiving sensor 15 is arranged opposite to the reference empty can or arranged between the light receiving sensors 6. It is. 16 is a comparator that outputs when the input signal value from each amplifier 13 becomes larger than the input signal value from the detection level setter 14; 17 is an OR circuit that receives the input signal from each comparator 16; 18 is an empty can 8;
19 is an amplifier for amplifying the input signal of the photo switch 18; 20 is a pulse generator for generating pulses based on the input signal from the amplifier 19; Reference numeral 21 is an AND circuit which receives and outputs the input signal from the pulse generator 20 and the input signal from the OR circuit 17, and the output signal from the AND circuit 21 is input to a predetermined abnormal can discharge circuit. It is.

The operation of the above configuration will be explained. First, conveyor 12
When the empty can 8 is brought to a predetermined position directly under the hood 3, as shown in FIG. The light becomes a luminous flux and is projected onto the flange 8A. Here, if the shape of the flange 8A is normal as shown by the solid line in Figure 6, the luminous flux is emitted along the direction of the inscribed line of the flange 8A, so the luminous flux will proceed straight as it is,
The light is not received by the light receiving sensor 6. In addition, the light beam that has traveled straight is reflected by the inner surface of the empty can 8 and attempts to enter the light receiving sensor 6, but since the light receiving sensor 6 is located inside the annular groove 5, the light is blocked by the hood 3, and the light is reflected. No light enters the light receiving sensor 6. Therefore, no signal is output from the light receiving sensor 6, and the empty can 8 passes under the inspection head 1 as it is. Next, if the shape of the flange 8A is abnormal as shown by the imaginary line in FIG.
to go into. Then, a signal is output from the light receiving sensor 6, amplified by the amplifier 13, and compared with the input signal from the detection level setter 14 by the comparator 16. If the input signal value from the light receiving sensor 6 is larger, the signal is output from the comparator 16. A signal is manually input to the OR circuit 17. At the same time, the photo switch 18 detects the empty can 8, and the signal is input to the pulse generator 20 via the amplifier 19.
The pulse generator 20 emits pulses. The AND circuit 21 receives the signal from the pulse generator 20 and the signal from the OR circuit 17, and inputs the signal to the abnormal can ejection circuit. Empty cans 8 having abnormal flange 8A located at are discharged from conveyor 12.

It is possible to inspect various types of empty cans 8 having different heights, from small empty cans 8 shown in phantom lines in FIG. 3 to large empty cans 8 shown in solid lines in the same figure.

As described above, according to the empty can inspection device of the present invention, the annular fluorescent lamp emits an annular luminous flux along the direction of the inscribed line of the flange, so when the flange is normal, the luminous flux goes straight as it is. However, the light receiving sensor does not receive any light. In addition, the light beam that has traveled straight is reflected off the inner surface of the empty can and tries to enter the light receiving sensor, but since each light receiving sensor is arranged in an annular groove, that light is blocked by the hood, and the reflected light is never enters the light receiving sensor.
Therefore, there will be no error when something is abnormal even though it is normal. Also, if the flange is abnormal,
The above luminous flux hits the abnormal part of the flange and is reflected, and enters the light receiving sensor. Therefore, abnormalities in the flange can be reliably detected. Furthermore, since an inexpensive annular fluorescent lamp is used as the light source, it is economical and easy to replace.
Furthermore, a mirror is placed inside the socket of the annular fluorescent lamp, so the socket does not become dark.

[Brief explanation of drawings]

FIG. 1 is a front view of the abnormal can, FIG. 2a is a vertical cross-sectional view of the main part of the normal can, and FIG. 2b is a vertical cross-sectional view of the main part of the abnormal can. Figure 3 and the following figures show one embodiment of the present invention, with Figure 3 being a longitudinal sectional view and Figure 4 showing the -
An arrow view, FIG. 5 is an abnormal can detection circuit diagram, and FIG. 6 is an enlarged longitudinal sectional view of the main part. 1...Inspection head, 2...Circular hole, 3...Hood, 6
...Light receiving sensor, 8...Empty can, 8A...Opening side seam flange, 9...Annular fluorescent lamp, 9A...Socket, 11
...mirror, 12...conveyor.

Claims (1)

[Scope of utility model registration request] An inspection head is placed above the inspection position on the empty can transport path, a hole with a diameter larger than the empty can is formed in the bottom plate of the inspection head, a hood is placed in the center of the hole, and the hood is inspected. An annular groove is formed directly above the opening side seam flange of the empty can brought to the position, and a large number of light receiving sensors are arranged at appropriate intervals in the annular groove, and the sensors are arranged in the inspection head. At the same time, an annular fluorescent lamp is provided which emits an annular beam of light from obliquely above the flange through a hole in the bottom plate of the inspection head to the opening-side seam flange along the direction of the inscribed line of the flange. An empty can inspection device characterized in that a mirror is disposed inside the socket to reflect light against the opening side seam flange.