JP2008076369A - Can lid testing method and can lid testing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a can lid testing method which enables the easy inspection of a distribution status of a sealing compound applied to the can lid. <P>SOLUTION: In the testing method for inspecting the can lid 100 which is applied with the sealing compound 103 at the annular predetermined range A including inside of a curl section 101 which is located a full outer periphery, the testing method comprises a pre-process S1 which extends the curl section 101 so that the predetermined range A becomes nearly horizontal, a measuring process S2 which acquires the thickness of the sealing compound 103 at a plurality of measuring points P1, P2, ..., Pn which are predetermined within the predetermined range A of the can lid 100 extending the curl section 101 at the pre-process S1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a can lid inspection method and a can lid inspection apparatus for inspecting a can lid coated with a sealing compound.

  Generally, a can is manufactured by attaching a can lid to a can body portion that is a body portion of the can, and winding a curl portion provided on the outer periphery of the can lid and an end portion of the can body portion. A sealing compound is applied to the end portion of the can body portion and the curled portion to be tightened so that the can lid and the can body portion are brought into close contact with each other.

  As a method for inspecting the sealing compound applied to the can lid, the weight of the can lid in a state where the sealing compound is applied and the weight of the can lid after the sealing compound is removed are measured. A method for inspecting the total weight of the sealing compound applied to the can lid from the difference in weight is known.

  Since it is desirable that the sealing compound is uniformly applied to the curled portion of the can lid over the entire circumference, a method for easily inspecting the distribution state of the sealing compound applied to the can lid is desired. . However, only the total weight of the sealing compound applied to the can lid can be measured by the measurement method described above.

  Then, an object of this invention is to provide the can lid inspection method and can lid inspection apparatus which can test | inspect easily the distribution state of the sealing compound apply | coated to the can lid.

  In the can lid inspection method of the present invention, a curl portion (101) is provided on the entire outer periphery, and a sealing compound (103) is applied to an annular predetermined range (A) including the inner surface of the curl portion. In the inspection method for inspecting the lid (100), a pretreatment step (S1) for extending the curled portion so that the predetermined range is substantially horizontal, and a can lid in which the curled portion is extended in the pretreatment step The measurement step (S2) for obtaining the thickness of the sealing compound at a plurality of measurement points set within the predetermined range is provided, thereby solving the above-described problem.

  According to the can lid inspection method of the present invention, first, the predetermined range is made substantially horizontal in the preprocessing step, so that the thickness of the sealing compound at a plurality of measurement points set in the predetermined range can be easily obtained. it can. In addition, since the thickness of each sealing compound at a plurality of measurement points set within a predetermined range is obtained, the distribution of the sealing compound applied to the can lid by comparing the thickness of each of these measurement points The state can be easily inspected.

  In one form of the can lid inspection method of the present invention, in the measurement step, a distance from a predetermined reference height to each measurement point is measured by a non-contact distance measuring device (30), and the measurement point is measured at each measurement point. The thickness of the sealing compound may be obtained. In this case, since it is not necessary to directly contact the sealing compound, the thickness of the sealing compound can be obtained without deforming the sealing compound. Therefore, the thickness of the sealing compound can be obtained with higher accuracy.

  In one form of the can lid inspection method of the present invention, the plurality of measurement points are set at predetermined intervals over the entire circumference of the can lid at different positions on a virtual circle centered on the center of the can lid. May be. In this case, the distribution state of the sealing compound in the circumferential direction of the can lid can be inspected.

  The plurality of measurement points may be set side by side at predetermined intervals in the radial direction of the can lid so as to cross the predetermined range. In this case, the distribution state of the sealing compound in the radial direction of the can lid can be inspected.

  The can lid inspection apparatus of the present invention has a curl portion (101) provided on the entire outer periphery thereof, and a sealing compound (103) applied to an annular predetermined range (A) including the inner surface of the curl portion. In the inspection apparatus (1) for inspecting the lid (100), the curl extension means (20) for extending the curl part so that the predetermined range is substantially horizontal, and the curl part is extended by the curl extension means. Thickness acquisition means (30, 40) for acquiring the thickness of the sealing compound at a plurality of measurement points set within the predetermined range of the can lid, respectively, thereby solving the above-described problems. .

  According to the can lid inspection apparatus of the present invention, the thickness of the sealing compound at a plurality of measurement points can be easily obtained by making the predetermined range substantially horizontal as in the above-described can lid inspection method. Further, the distribution state of the sealing compound applied to the can lid can be easily inspected by comparing the thickness of the sealing compound at each measurement point acquired by the thickness acquisition means.

  In one form of the can lid inspection apparatus of the present invention, the thickness acquisition means may include a non-contact type distance measuring device (30) that measures a distance from a predetermined reference height to each measurement point. . In this case, the thickness of the sealing compound at each measurement point can be obtained with higher accuracy.

  In one form of the can lid inspection apparatus of the present invention, the plurality of measurement points are set at predetermined intervals over the entire circumference of the can lid at different positions on a virtual circle centered on the center of the can lid. Alternatively, the plurality of measurement points may be set side by side at predetermined intervals in the radial direction of the can lid so as to cross the predetermined range. By setting a plurality of measurement points in this way, the distribution state of the sealing compound in the circumferential direction of the can lid or the radial direction of the can lid can be inspected.

  In addition, in the above description, in order to make an understanding of this invention easy, the reference sign of the accompanying drawing was attached in parenthesis, but this invention is not limited to the form of illustration by it.

  As described above, according to the can lid inspection method of the present invention, since the curled portion is extended so that the predetermined range is substantially horizontal, the thickness of the sealing compound at each measurement point set in the predetermined range is easy. Can be obtained. Moreover, the distribution state of the sealing compound applied to the can lid can be easily inspected by comparing the thickness of the sealing compound at each acquired measurement point. Moreover, according to the can lid inspection apparatus of the present invention, the above-described can lid inspection method of the present invention can be executed.

  FIG. 1 shows one embodiment of the can lid inspection apparatus of the present invention, and FIG. 2 shows a can lid 100 to be inspected by the can lid inspection apparatus 1 of FIG. As shown in FIG. 2, the outer periphery of the can lid 100 is rounded inward over the entire circumference, and thereby, the curled portion 101 is provided over the entire circumference of the can lid 100. As shown in an enlarged view of a part of the cross section in FIG. 3, a flat portion 102 is provided on the inner peripheral side of the can lid 100 with respect to the curled portion 101. Further, as shown in FIG. 3, a sealing compound 103 is applied to the curled portion 101 and the flat portion 102 in order to bring the can lid 100 into close contact with the can body 200 indicated by an imaginary line in FIG. . Therefore, the range indicated by region A in FIG. 3 corresponds to the predetermined range of the present invention. The can lid 100 and the sealing compound 103 may have the same shape and material as those known, and thus detailed description thereof is omitted. Hereinafter, the surface of the can lid 100 on which the sealing compound 103 is applied, that is, the upper surface of FIG. 1 is referred to as the back surface of the can lid 100, and the surface opposite to the back surface, that is, the lower side of FIG. Is called the surface of the can lid 100.

  As shown in FIG. 1, the can lid inspection apparatus 1 includes a stage device 10, a curl extending device 20 as a curl extending means for extending the curled portion 101 of the can lid 100, a distance measuring device 30, and a control device 40. I have. The stage apparatus 10 includes a stage 11 on which a can lid 100 to be inspected is placed, a base 12 that rotatably supports the stage 11, and the can lid 100 so that the can lid 100 rotates together with the stage 11. A fixing portion 13 (see FIG. 5) that is fixed to the stage 11 is provided. A motor 14 for rotating the stage 11 to the left and right is built in the base 12. For example, a stepping motor is used as the motor 14 so that the stage 11 can be stopped at every predetermined angle. As shown in FIG. 1, the can lid 100 is placed on the stage 11 with the back surface facing up. The size of the stage 11 is set such that when the curled portion 101 of the placed can lid 100 is extended, the extended curled portion 101 is accommodated on the stage 11.

  The curl extension device 20 includes a first arm 22 having a claw 21 provided at the tip thereof and a second arm 24 provided with a roller 23 provided at the tip, for pushing the curled portion 101 of the can lid 100 outward. Yes. As shown in FIG. 1, the first arm 22 and the second arm 24 are attached to a main body 25 disposed above the stage 11. In the main body 25, the first arm 22 capable of moving the first arm 22 in the vertical direction of FIG. 1 and the radial direction of the can lid 100 placed on the stage 11, and the second arm 24 are illustrated. And a second actuator that can be expanded and contracted in the vertical direction.

  The distance measuring device 30 emits a laser beam toward a measurement target and receives reflected light from the measurement target, and a radial direction of the can lid 100 on which the sensor head 31 is placed on the stage 11. The rail part 32 supported so that a movement is possible, and the actuator 33 for moving the sensor head 31 along the rail part 32 are provided. As shown in FIG. 1, the sensor head 31 is connected to the control device 40, and the control device 40 measures from a predetermined measurement reference position based on the correlation between the laser light emitted from the sensor head 31 and the reflected light. The distance to the point, that is, the reflection point of the laser beam is obtained, and the measurement result is stored. Note that the distance measurement resolution of the distance measuring device 30 is desirably in the order of microns in order to allow the thickness of the sealing compound 103 to be accurately inspected.

  The control device 40 includes an arithmetic processing unit 41 as a computer unit that executes inspection process management by the can lid inspection device 1, processing of measurement results of the sensor head 31, and the stage device 10 according to instructions from the arithmetic processing unit 41. An operation control unit 42 that controls the operation of each unit of the curl extension device 20 and the distance measurement device 30, a signal processing unit 43 that executes predetermined processing on an output signal from the sensor head 31, and an arithmetic processing unit 41 An input unit 44 for a user to input an instruction, an output unit 45 for presenting a test result or the like processed by the arithmetic processing unit 41 to the user, a computer program to be executed by the arithmetic processing unit 41, and And a storage unit 46 for storing measured data and the like. The arithmetic processing unit 41, the input unit 44, the output 45, and the storage unit 46 can be configured by using a general-purpose computer device such as a personal computer. In this case, the input unit 44 is provided with input devices such as a keyboard and a mouse, and the output unit 45 is provided with a monitor device. An output device such as a printer may be added to the output unit 45. As the storage unit 46, a hard disk storage device or a storage device such as a semiconductor storage element capable of storing data is used. The operation control unit 42 and the signal processing unit 43 may be realized by a hardware control circuit or may be realized by a computer unit.

  Next, an inspection method of the can lid 100 by the can lid inspection apparatus 1 will be described with reference to FIG. FIG. 4 shows a can lid inspection routine executed by the arithmetic processing unit 41 of the control device 40. In the routine of FIG. 4, the arithmetic processing unit 41 first performs preprocessing for extending the curled portion 101 of the can lid 100 in step S1. A procedure for extending the curled portion 101 of the can lid 100 will be described with reference to FIGS. As shown in the left diagram of FIG. 5, in the pretreatment step, the can lid 100 is first placed on the stage 11 with the back side up, and then the can 11 so that the stage 11 and the can lid 100 rotate coaxially. The lid 100 is fixed to the stage 11. Next, as shown in the center diagram of FIG. 5, the curl portion 101 of the can lid 100 is extended by the claw 21 and the roller 23 of the curl extension device 102.

  As a procedure for extending the curled portion 101, first, the claw 21 is lowered inside the curled portion 101 of the can lid 100 as shown in FIG. 6, and then the claw 21 is moved in the outer peripheral direction of the can lid 100 as shown in FIG. The curled portion 101 is raised by moving it (to the right in FIG. 7). Thereafter, the stage 11 is rotated with the claw 21 fixed at this position. By rotating the stage 11 in this way, the curled portion 101 of the can lid 100 can be raised to a substantially 90 ° state as shown in FIG. The portion where the curled portion 101 is raised to approximately 90 ° is then extended approximately horizontally by the roller 23 as shown in FIG. When the stage 11 rotates and the curled part 101 raised about 90 ° by the claw 21 moves downward, the roller 23 moves the curled part 101 to the stage 11 so that the curled part 101 is further opened outward. Press against. Thereafter, the roller 23 is maintained in this state until the stage 11 rotates and all the curled portions 101 raised to approximately 90 ° by the claws 21 are extended substantially horizontally. Note that whether or not the curled portion 101 of the can lid 100 has been extended substantially horizontally is determined by, for example, moving the roller 23 downward and pressing the curled portion 101 against the stage 11 and then moving the stage 11 one or more times, for example, It is determined that all the curled portions 101 extend substantially horizontally when rotated about one and a half times. In this way, by extending the curled portion 101 of the can lid 100 over the entire circumference, the portion to which the sealing compound 103 is applied can be made substantially horizontal as shown in the right figure of FIG.

  Next, the arithmetic processing unit 41 measures the thickness of the sealing compound 103 of the can lid 100 in step S2. A method for measuring the thickness of the sealing compound 103 will be described with reference to FIGS. As shown in FIG. 9, the sensor head 31 emits a laser toward the portion where the sealing compound 103 is applied in the portion of the can lid 100 where the curled portion 101 extends substantially horizontally. The distance from 31 to the surface 103a (see FIG. 8) of the sealing compound 103 is measured. Note that the measurement points P1, P2,..., Pn for measuring this distance are set in advance by the user, for example, different positions on the virtual circle L centered on the center of the can lid 100 as shown in FIG. Are set at predetermined intervals over the entire circumference of the can lid 100. 10, each measurement point P1, P2,..., Pn is set in the circumferential direction of the can lid 100 over the entire circumference every predetermined angle α (for example, 20 °).

  In this step, first, the distance at each measurement point of the can lid 100 in a state where the sealing compound 103 is applied is measured. This measurement is performed, for example, by fixing the sensor head 31 at a position where the thickness of the sealing compound 103 is to be measured in the radial direction of the can lid 100 and stopping the stage 11 each time the stage 11 is rotated by a predetermined angle. The measurement results obtained by measuring the distances at the respective measurement points are stored in the storage unit 46. Next, the sealing compound 103 applied to the can lid 100 by the user is removed. Thereafter, the arithmetic processing unit 41 measures the distance of each measurement point again and stores the measurement results in the storage unit 46. The arithmetic processing unit 41 subtracts the distance measured before the removal of the sealing compound 103 from the distance measured after the removal of the sealing compound 103 to obtain the thickness of the sealing compound 103 at each measurement point. Thus, by acquiring the thickness of the sealing compound 103 at each measurement point, the distance measuring device 30 and the control device 40 function as the thickness acquisition means of the present invention.

  In the next step S <b> 3, the arithmetic processing unit 41 presents the thickness of the sealing compound 103 at each measurement point to the user via the output unit 45. As a method of presentation to the user, for example, as shown in FIG. 11, the thickness of the sealing compound 103 at each measurement point is displayed in a circle at predetermined angles in the same manner as each measurement point. Thereafter, the current routine is terminated.

  According to the can lid inspection apparatus 1 of the present invention, the distribution in the circumferential direction of the sealing compound 103 applied to the can lid 100 as shown in FIG. 11 can be measured. For this reason, for example, uneven application of the sealing compound 103 or chipping of the sealing compound 103 from a predetermined range can be easily inspected. In addition, since the distribution of the sealing compound 103 applied to the can lid 100 can be easily measured in this way, the quality of the can can be managed more strictly.

  The present invention is not limited to the form described above, and may be implemented in various forms. For example, the pretreatment process for extending the curled portion of the can lid and the measurement process for measuring the thickness of the sealing compound may be performed by separate apparatuses. In this case, each process can be performed in parallel. Therefore, a plurality of can lids can be inspected in a shorter time.

  The setting position of the measurement point for measuring the thickness of the sealing compound is not limited to the circumferential direction of the can lid. For example, a plurality of measurement points may be set at predetermined intervals in the radial direction of the can lid 100 as shown in FIG. By setting the measurement points in this way, the radial distribution of the sealing compound 103 applied to the can lid 100 can be measured.

  The method for measuring the thickness of the sealing compound is not limited to the measurement method using laser light. The thickness of the sealing compound applied to the can lid may be measured by various methods having a resolution capable of inspection.

The figure which shows one form of the can lid test | inspection apparatus of this invention. The figure which shows an example of the can lid inspect | inspected with the can lid inspection apparatus of this invention. The figure which expands and shows a part of cross section of the can lid | cover of FIG. The flowchart which shows the can lid test | inspection routine which the control apparatus of FIG. 1 performs. The figure which shows the procedure of the pre-processing process which extends the curl part of a can lid. The figure which shows an example of the position which lowers | hangs the nail | claw of a curl extension apparatus. The figure which expands and shows a part of can lid in the state by which the curl part was raised to the outer peripheral side. The figure which expands and shows a part of can lid in the state where the curl part was extended. The figure which shows an example of the distance measurement by a sensor head. The figure which shows an example of the measurement point set to a can lid. The figure which shows an example of a test result. The figure which shows the other example of the measurement point set to a can lid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Can lid inspection apparatus 10 Stage apparatus 20 Curl extension apparatus (curl extension means)
30 Distance measuring device (thickness acquisition means)
40 Control device (thickness acquisition means)
100 Can lid 101 Curled part 103 Sealing compound S1 Pretreatment process S2 Measurement process Pn Measurement point

Claims (8)

In an inspection method for inspecting a can lid in which a curled portion is provided over the entire circumference and a sealing compound is applied to an annular predetermined range including the inner surface of the curled portion,
A pre-processing step of extending the curled portion so that the predetermined range is substantially horizontal, and a plurality of measurement points set within the predetermined range of the can lid in which the curled portion is extended in the pre-processing step. A can lid inspection method comprising: measuring steps for obtaining thicknesses of the sealing compounds, respectively.   The measuring step includes measuring a distance from a predetermined reference height to each measurement point with a non-contact type distance measuring device to obtain a thickness of the sealing compound at each measurement point. The can lid inspection method according to 1.   The plurality of measurement points are set at predetermined intervals over the entire circumference of the can lid at different positions on a virtual circle centered on the center of the can lid. The can lid inspection method as described.   3. The can lid inspection method according to claim 1, wherein the plurality of measurement points are set to be arranged at predetermined intervals in a radial direction of the can lid so as to cross the predetermined range. In an inspection apparatus for inspecting a can lid in which a curl portion is provided over the entire circumference and a sealing compound is applied to a predetermined annular range including the inner surface of the curl portion,
The curl extending means for extending the curled portion so that the predetermined range is substantially horizontal, and the measurement points at the plurality of measurement points set within the predetermined range of the can lid in which the curled portion is extended by the curl extending means. A can lid inspection apparatus, comprising: thickness acquisition means for acquiring the thickness of each sealing compound.   6. The can lid inspection device according to claim 5, wherein the thickness acquisition means includes a non-contact type distance measuring device that measures a distance from a predetermined reference height to each measurement point.   The plurality of measurement points are set at predetermined intervals over the entire circumference of the can lid at different positions on an imaginary circle centered on the center of the can lid. The can lid inspection apparatus as described.   The can lid inspection device according to claim 5 or 6, wherein the plurality of measurement points are set to be arranged at predetermined intervals in a radial direction of the can lid so as to cross the predetermined range.

Images