JPH0327293B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for inspecting cans used as containers for canned foods, etc., and particularly to a method for inspecting cans that enables automatic inspection.

[Prior Art] A can used as a container for food, etc. has a can body,
It is made up of a can lid and a can bottom. In the case of so-called three-piece cans, the can lid and can bottom are wrapped around the can body, and two-piece cans have the can body and can bottom integrated. In this case, the can lid is wrapped around the can body to seal the can. The seaming part of the can body and can lid (hereinafter referred to as "can lid" including the can bottom) is connected to the body hook (BH) formed at the edge of the can body, as shown in Figure 7b. It is formed by engaging and crimping the cover hook CH formed on the outer circumferential line of the can lid.

Cans produced in this manner are sometimes not sufficiently processed, resulting in various defects in the cans. This defect in the can not only causes the contents to deteriorate, but also impairs the appearance of the can and reduces its commercial value. For this reason, an inspection process is always included in the can manufacturing process, but in the past, workers would remove the can from the manufacturing process and visually find the seam, etc. of the can. The can was set on the table of the inspection device so that it was in a predetermined position, and then the can was rotated by a predetermined angle to inspect each part of the can.

Furthermore, the inspection of the seam part, which is the most important part in inspecting cans, has conventionally been carried out by cutting the seam part, polishing its cross section, and projecting it on an enlarged scale.

[Problems to be Solved by the Invention] As described above, conventional work involves detecting and determining the reference position of a can sent to an inspection device, and positioning the measurement point of the can so as to correspond to the probe of the measurement unit. was done manually. Therefore, there was a problem in that the inspection could not be automated and a large number of cans could not be inspected quickly.

In addition, the inspection of the seam-tight portion is carried out by cutting and polishing the seam-tight portion and then enlarging and projecting it, which poses a problem in that the inspection requires sophisticated technology and a long time.

The present invention was developed in view of the above problems, and automatically determines the reference position of a can sent to an inspection device and positions the measurement point of the can at a position corresponding to the probe of the measurement unit. In addition, the seaming section can be inspected based on the measured seaming thickness, seaming width, can height, and countersink depth, and the external shape of many cans can be inspected without manual intervention. Another object of the present invention is to provide a can inspection method that enables quick inspection of seamed parts.

According to a rule of thumb, if the seaming part is defective, there is an abnormality in one or more of the seaming thickness, seaming width, can height, and countersink depth, which are the external dimensions of the can. often occurs. Therefore, by knowing the dimensions of the seam thickness, seam width, can height, and countersink depth at multiple points on the can, the seam portion can be inspected indirectly.

[Means for Solving the Problems] In order to achieve the above object, the can inspection method of the present invention includes the following steps: (a) detecting a reference point of the can and determining the reference position in the circumferential direction of the can; (b) a reference The can whose position and measurement point have been determined is transferred to a measuring section where measuring units are placed at positions corresponding to multiple measuring points separated by a predetermined angle from the reference position, and at this measuring section, the axis of the can is A step of aligning the core with the axis of the rotary table, C. A step of measuring at least one of the seaming thickness, seaming width, can height, and countersink depth at each measurement point. D. After the above measurements are completed. , rotate the can by a predetermined angle from the reference position, and measure at least one of the previously measured seaming thickness, seaming width, can height, and countersink depth at each measurement point of the can. Step of measuring; E. Step of repeating step (d) above until all measurements of seaming thickness, seaming width, can height, and countersink depth at each measurement point of the can are completed; F. The above measurement results. Accordingly, the seaming thickness, seaming width, can height, and countersink depth at each measurement point are determined as a set of data, and based on these data, the can is judged to be good or bad. Preferably, the seaming thickness at each measurement point of the can,
There is a method in which the seaming width and countersink depth are measured at the lower seaming part of the can.

[Example] Examples of the present invention will be described below.

First, an apparatus for implementing the method of the present invention will be described.

Figure 1 is an overall plan view of the device, Figure 2 is a side view of the movable table, Figure 3 is a side view of the can height measuring unit, and Figure 4 is the winding width measuring unit and countersink depth measuring unit. FIG. 5 shows a side view of the seaming thickness measuring unit.

In FIGS. 1 and 2, 1 is a base, 2 is a moving table provided on the base 1,
The cylinder 3 performs reciprocating motion. 4 is a rotary table placed on one end of the moving table 2 (the left end in Figures 1 and 2), and is rotated and indexed via a belt 6 by a motor 5 also placed on the moving table 2. It's becoming possible. A plurality of grooves 4a are provided on the surface of the rotary table 4 in a circumferential manner, depending on the type of can diameter, for engaging the seaming portion so that the can 100 is located approximately at the center of the rotary table. Furthermore, on the rotary table 4,
Six notches 4b are formed from the outer periphery toward the center at 60 degree intervals.

The rotary table 4 moves between the reference position determining section A and the measuring section B of the can 100 by the reciprocating movement of the moving table 2.

In the reference position determining section A, various means for determining the reference position of the can 100 sent onto the rotary table 4 are arranged on the base 1. That is,
A rotating roller unit 10 is arranged near one side of the rotating table 4.
A pressure roller unit 20 is arranged near the other side of the rotary table 4, facing 180 degrees from the rotary table 4. The rotating roller unit 10 includes a rotating roller 11, a motor 12 for rotating the rotating roller 11, and a base 13 that supports the rotating roller 11 and the motor 12 and is moved forward and backward by a cylinder 14.

The pressing roller unit 20 also includes two pressing rollers 21, a pantograph-shaped pressing member 22 which has the pressing roller 21 at its tip and always applies a pressing force in the radial center direction of the rotary table;
It consists of a pressing roller 21 and a cylinder 23 that moves the pressing member 22 forward and backward.

Furthermore, the base 13 of the rotating roller unit 10
, a sensor 15 for detecting the seam of the can 100 is installed at a position offset by 10 degrees from the longitudinal center line of the movable table 2, and is adapted to move forward and backward together with the rotating roller unit 10. .

In the measuring section B, a measuring unit for centering the can 100 transferred from the reference position determining section A and measuring each part of the can 100 is arranged. That is,
In FIG. 1, reference numerals 30, 30 are centering means for aligning the axis of the can 100 and the axis of the rotary table 4, and the centering means 30, 30 is a centering means for aligning the axis of the can 100 and the axis of the rotary table 4. They are arranged so as to face each other perpendicularly to each other. These centering means 30, 30 are composed of abutting pieces 31, 31 that press the lower part of the can body of the can 100, and rotation preventing cylinders 32, 32 that apply a pressing force to these abutting pieces 31, 31.

Further, 40, 50, 60, and 70 are a can height measuring unit, a seaming width measuring unit, a seaming thickness measuring unit, and a countersink depth measuring unit.
Can height measuring unit 40 and winding width measuring unit 5
0 is at an interval of 60 degrees with one centering means 30 in between, and the seaming thickness measuring unit 60 and countersink depth measuring unit 70 are at an interval of 60 degrees with the other centering means 30 in between. It is placed in Therefore, the can height measuring unit 40, the seaming thickness measuring unit 60, the seaming width measuring unit 50, and the countersink depth measuring unit 70 are respectively opposed to each other with the axis of the rotary table 4 in between. The width measuring unit 50, the seaming thickness measuring unit 60, the can height measuring unit 40 and the countersink depth measuring unit 70 are arranged on the outer periphery of the rotary table 4 at intervals of 120 degrees.

The can height measuring unit 40 is mounted on a pedestal 401 mounted on a base 1 (not shown) as shown in FIG.
, a movable base 402 that moves forward and backward in the radial direction of the rotary table 4 on the top surface of the adding platform 401 , and a movable base 402 that moves forward and backward in the radial direction of the rotating table 4 .
A column 403 is erected on the column 02, and a movable table 4 is supported on the side surface of the column 403 so as to be able to rise and fall freely, and is fixed at an arbitrary height position by a fixing screw 404.
05, a measuring stylus 407 that is supported by a movable table 405 so as to be able to rise and fall and is biased downward by a pressing spring 406, and a measuring stylus 407 that is supported by a movable table 405 so as to be able to move up and down.
08a, and a measuring device 409 such as a linear gauge for measuring the position of the measuring stylus 407.

As shown in FIG.
A movable base 502 that moves forward and backward in the radial direction of the rotary table 4 on the upper surface of 01, a support 503 erected on the movable base 502, and a support that is movable up and down on the support 503 and that can be finely adjusted with an adjustment screw 504. a movable table 505, a fixing screw 506 that fixes the movable table 505 at an arbitrary height position, a first probe 507 that is supported by the movable table 505 so as to be able to rise and fall and is urged downward by a pressing spring 508; A second measuring element 509 that faces the first measuring element 507 in the vertical direction, is supported by the movable table 505 so as to be freely raised and lowered, and is urged upward by a spring 510, and these first and second measuring elements 507 , 509 in a counter-biasing direction via a roller 511a;
The measuring device 512 is configured to measure the distance between the first and second measuring elements 507 and 509.

The seaming thickness measuring unit 60 is mounted on a pedestal 601 placed on the base 1, as shown in FIGS. 5a and 5b.
, a column 602 erected on the pedestal 601, and a slider 603 provided on the column 602 so as to be able to rise and fall freely.
and a cylinder 604 that raises and lowers the slider 603.
, a rotating plate 606 that is rotatably provided on the slider 603 with a pin 605 as a fulcrum, and an adjustment screw 607 for fixing the rotating plate 606 with the rotating plate 606 tilted at an appropriate angle with respect to the slider 603. and,
Bracket 608 attached to rotating plate 606
, a movable table 609 movable on the bracket 608 in the radial direction of the rotary table 4, and first and second probes 610, 612 movable on the rotary table 609 in the radial direction of the rotary table 4.
, a spring 611 that biases the first gauge stylus 610 outward in the radial direction of the rotary table, a spring 613 that biases the second gauge stylus 612 inward in the radial direction of the rotary table, and the first gauge stylus 610. It is comprised of a cylinder 614 that moves the second measuring element 612 in the opposite biasing direction via a roller 614a, and a measuring device 615 such as a linear gauge that measures the distance between the first and second measuring elements 610, 612.

The countersink depth measurement unit 70 has a fourth
As shown in the figure, a pedestal 70 mounted on the base 1
1, a movable base 702 that moves forward and backward in the radial direction of the rotary table 4 on the upper surface of the pedestal 701, and a movable base 702 that is supported in a vertically movable manner by a support 703 erected on the movable base 702, and that can be finely adjusted with an adjustment screw 704. A moving table 705, a fixing screw 706 for fixing the moving table 705 at an arbitrary height, a spring 7
The first probe 70 is urged upward by 08
7. A second measuring element 709 that faces the first measuring element 707 in the vertical direction, is supported by the movable table 705 so as to be able to rise and fall, and is urged upward by a spring 710;
Cylinder 711 to be moved in the opposite biasing direction via 11a, and first and second probes 707, 709
A measuring device 712, such as a linear gauge, is used to measure the distance between the two. In addition, each measuring element 5 of the seaming width measuring unit 50, the seaming thickness measuring unit 60, and the countersink depth measuring unit 70
07,509,610,612,707,709
is the can 100 from the notch 4b of the rotary table 4.
It is designed to measure the dimensions of each part at the lower seaming part.

Reference numeral 80 denotes a control section, which includes a control circuit for controlling the operation of the above-mentioned inspection device, and each measurement unit 4.
Process the signals measured at 0, 50, 60, 70,
It consists of a judgment circuit that judges whether the can is good or bad, and a statistical processing circuit that statistically processes the measured data.

Next, an embodiment of the inspection method of the present invention using the inspection apparatus having the above configuration will be described with reference to the flowchart of FIG.

The cans flowing on the production line are placed on the rotary table 4 located in the reference position determining section A by a carrying means (not shown). At this time, if the can is placed with the seam portion to be measured facing downward, the positioning of the can is stabilized, and the can is stabilized without being tilted even when the probe is brought into contact with the can (first step).

The rotating roller 11 of the rotating roller unit 10 and the pressing roller 21 of the pressing roller unit 20 move forward to sandwich the can 100, and the rotating roller 11
The can is rotated by the rotation of the can. And sensor 1
5, the rotation of the rotating roller 11, that is, the can 100, is stopped when the seam portion, which is the reference point of the can 100, is detected. As a result, the can 100 always has a seam at a certain point, in the case of this embodiment, 10 degrees counterclockwise from the longitudinal center line of the moving table 2.
If it is located at the wrong location, it will stop and the can 100
Determine the reference position of (second step).

The moving table 2 is moved and the rotary table 4, that is, the can 100 is moved from the reference position determining section A to the measuring section B.
Transfer to. Next, a pair of centering means 30, 3
Cylinder 3 for preventing rotation of the contact pieces 31, 31 of 0
2 and 32, the axis of the can 100 is aligned with the axis of the rotary table 4, and the can 100 is centered (third step). At this time, the can 100 remains clamped by the centering means 30, 30.

Can 100 clamped on rotary table 4
The measurement units 40, 50, 60, which are placed at positions 50 degrees, 110 degrees, 230 degrees, and 290 degrees counterclockwise from the standard position of the can toward each measurement point.
70 moves forward and reaches one measurement point, i.e. the first of the cans.
Can height (H), seaming width (W), seaming thickness (T), countersink depth at the second, fourth, and fifth measurement points
Measure (C) (4th step).

Here, move 50 degrees counterclockwise from the standard position of the can.
The positions separated by 110 degrees, 110 degrees, 170 degrees, 230 degrees, 290 degrees and 350 degrees are the first, second, third, fourth, fifth and sixth measurement points of the can, respectively.

The can height measuring unit 40 has a movable base 402.
moves toward the rotary table 4 side, and the probe 407 is lowered by the biasing force of the spring 406 due to the retreat of the cylinder 408, and reaches the first position 50 degrees counterclockwise from the seam portion, which is the reference position of the can 100. makes contact with the top of the can at the measurement point. The position of the measuring tip 407 at this time is measured with a measuring device 409,
It is transmitted to the determination circuit of the control unit 80.

The reason why the first measurement point was set 50 degrees away from the seam is as follows.

The seam portion has higher rigidity than other parts of the body because both ends of the plates forming the body slightly overlap each other. For this reason, even if the seam thickness, seam width, can height, and countersink depth at the seam portion are measured, the can cannot be accurately measured.
Therefore, when measuring six points at intervals of 60 degrees as in this embodiment, it is necessary to set the measurement points at points that avoid the seam, so the measurement points are set at 50 degrees. For the above reasons, it is of course possible to set the first measurement point at a point other than 50 degrees away from the seam.

The winding width measurement unit 50 has a movable base 502.
moves toward the rotary table 4 side, and the first and second probes 507 and 509 move toward the cylinder 511.
As a result of the retreat, the springs 508 and 510 move up and down by the urging force of the springs 508 and 510, respectively. Then, the first and second measuring points 507, 509 sandwich a second measuring point which is further shifted 60 degrees counterclockwise from the first measuring point of the seaming part, and the measuring points 507, 509 at that time are
9 is measured by the measuring device 512, and the control unit 80
The signal is sent to the determination circuit.

The seaming thickness measuring unit 60 includes a slider 603
As the temperature rises, the first and second contact points 61
0,612 is moved in the radial direction of the rotary table by the biasing force of springs 611, 613 due to the retreat of the cylinder 614, and is tightened at the fourth measurement point which is 120 degrees counterclockwise offset from the second measurement point. Sandwich the parts from the inside and outside. At this time, the distance between the first and second probes 610 and 612 is measured by a measuring device 615 and transmitted to the determination circuit of the control unit 80. In addition,
The first and second probes 610, 612 are adjusted to be inclined by an angle corresponding to the angle that the chuck wall of the seaming portion makes with respect to the can body.

In the countersink depth measurement unit 70, the movable base 702 moves toward the rotary table 4, and the second probe 709 moves upward by the biasing force of the spring 710 due to the retreat of the cylinder 711. It comes into contact with the counter sink at the fifth measurement point, which is offset 60 degrees counterclockwise from the fourth measurement point. At this time, the first and second probes 707,
709 is measured with a measuring device 712, and the control unit 8
Send to measurement circuit 0.

Then, the can 100 is removed by the centering means 30, 30.
At the same time, each measurement unit 4
0, 50, 60, 70 measuring heads on rotary table 4
The rotary table 4 is rotated 60 degrees counterclockwise in FIG. 1 by operating the motor 5. Thereafter, the centering means 30, 30 are moved forward to clamp the can 100 again, and each measurement point (sixth , first, third, fourth) as other measuring points, each measuring unit 40, 50, 60,
It is fixed at a position corresponding to the measuring element 70 (fifth step).

Here, each measurement unit 40, 5 is again moved toward the can 100 clamped on the rotary table 4.
0, 60, and 70 move forward, and measure the can height, seaming width, seaming thickness, and countersink depth at the sixth, first, third, and fourth measurement points in the same way as in the previous case. (6th step).

Hereinafter, repeat the fifth and sixth steps as many times as necessary (in the case of this example, four times) to measure the can height, seaming width, seaming thickness, and countersink depth at six measurement points every 60 degrees. (7th step).

In this way, when each measurement at a predetermined measurement point is completed, the control unit 80
The above measurement results are calculated based on the can height, seaming width, and
Summary of seaming thickness and countersink depth,
Let this be one set of data. Furthermore, in the determination circuit, the can 100 is determined based on the above data.
A quality determination is made (eighth step). According to this determination result, processing such as sorting out good cans and defective cans and transporting them to separate lines is performed.

According to the method of the present invention, it is possible to perform various inspections on cans, such as the quality of the seamed portion of the can and the presence or absence of buckling in the can.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and includes, for example, the following modifications.

A method for inspecting two-piece cans, etc. that do not have a seam, by using a mark other than the seam or an arbitrary point as a reference position, and rotating the can by a predetermined angle from this reference position.

A can inspection method that uses the first measurement point as the reference position for two-piece cans without seams. This is because there is no reason why two-piece cans or the like without a seam should not use the reference position as the measurement point like the above-mentioned three-piece can.

A can inspection method in which the number of measurement points is other than six, for example, three.

A can inspection method that measures the seam thickness, seam width, can height, and countersink depth at the upper seam part of the can.

[Effects of the Invention] As described above, according to the present invention, it is possible to automatically determine the reference position of a can, position the measurement point to a position corresponding to the probe of the measurement unit, etc., and thereby improve the overall can inspection. In addition to automating the process, it is also possible to speed up testing. Another advantage is that the seaming part can be inspected based on the external shape of the can.

[Brief explanation of the drawing]

1 to 5 are examples of an apparatus for carrying out the method of the present invention, and FIG. 1 is an overall plan view of the apparatus;
Figure 2 is a side view of the movable table part, Figure 3 is a side view of the can height measuring unit, Figure 4 is a side view of the winding width measuring unit and countersink depth measuring unit, and Figure 5 is a. 6 is a flowchart showing the steps of the method, and FIGS. 7a and 7b are an overall view of the can and an enlarged sectional view of the seaming part. 2: Moving table, 4: Rotating table, 10:
Rotating roller unit, 20: Pressing roller unit, 30: Centering means, 40: Can height measuring unit, 50: Sealing width measuring unit, 60: Sealing thickness measuring unit, 70: Counter sink depth measuring unit, 80: Control unit, A: Reference position determination unit,
B: Measuring part.

Claims (1)

[Claims] 1. A step of detecting a reference point of the can and determining the reference position in the circumferential direction of the can; (b) A step of detecting the reference point of the can and determining the reference position in the circumferential direction of the can; a process of transporting the can to a measuring section with measuring units arranged at positions corresponding to multiple measuring points separated by a distance of 1,000 cm, and aligning the axis of the can with the axis of the rotary table at this measuring section; (c) seaming tightening at each measuring point; A step of measuring at least one of the following: thickness, seaming width, can height, and countersink depth; (d) After the above measurements are completed, the can is rotated by a predetermined angle from the reference position to measure the can. A step of measuring at least one of the previously measured seaming thickness, seaming width, can height, and countersink depth at each measurement point; A process that is repeated until all measurements of seaming thickness, seaming width, can height, and countersink depth are completed; A method for inspecting a can, comprising the following steps: determining the countersink depth as a set of data, and determining whether the can is good or not based on these data. 2. The can according to claim 1, wherein the seaming thickness, seaming width, and countersink depth at each measurement point of the can are measured at the lower seaming portion of the can. inspection method.