JP2005308507A - Opening part inspection device and opening part inspection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening part inspection device and an opening part inspection method performing easily total inspection. <P>SOLUTION: This opening part inspection device for inspecting the outer diameter of the opening part 601 of a plastic bottle 600 has: a floodlighting part 100 for floodlighting parallel light to a domain including the opening part 601; a light receiving part 200 for receiving the parallel light floodlighted from the floodlighting part 100 and passing the domain including the opening part 601 of the plastic bottle 600; a controller 300 for determining whether the outer diameter of the opening part 601 is within a standard range determined beforehand or not based on the parallel light received by the light receiving part 200; and a discharge part 400 for discharging a plastic bottle 600 having the opening part 601 when the outer diameter of the opening part 601 is out of the standard range determined beforehand. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mouth inspection device and a mouth inspection method for inspecting the outer diameter of the mouth of a plastic bottle.

Conventionally, a mouth of a container manufactured by blow molding such as a PET bottle is inspected to determine whether or not its outer diameter is within a reference range. In such an inspection, a method is generally employed in which a measurement gauge or the like is attached to the mouth of a container and the outer diameter of the mouth is measured (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-47948

  However, since the conventional inspection takes time because of the necessity of attaching a measurement gauge, it can be applied only to a sample inspection in which a predetermined number is selected from the manufactured containers. It was not possible to conduct 100% inspection. For this reason, a container whose outer diameter is not within the reference range may not be excluded as a defective product.

  The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a mouth inspection device and a mouth inspection method capable of easily performing a total inspection.

  The mouth inspection device of the present invention is for inspecting the outer diameter of the mouth of a PET bottle, and projects light that projects parallel light onto a region including the mouth of the PET bottle. And a light receiving means for receiving parallel light that has passed through an area including the mouth portion of the plastic bottle, and an outer diameter of the mouth portion is predetermined based on the parallel light received by the light receiving means. It has the structure which has the determination means which determines whether it is in a reference | standard range.

  With this configuration, after the mouth of the PET bottle is disposed between the light projecting means and the light receiving means, the light projecting means projects light, and the light receiving means receives the parallel light that has passed through the region including the mouth of the PET bottle. By receiving light, it is determined whether or not the outer diameter of the mouth is within a predetermined reference range based on the received parallel light. It becomes possible.

  In addition, the mouth inspection apparatus of the present invention is configured to include transport means for transporting the mouth of the plastic bottle between the light projecting means and the light receiving means.

  With this configuration, since the mouth portion of the PET bottle is automatically arranged between the light projecting means and the light receiving means, it is possible to perform a total inspection more easily.

  In the mouth inspection apparatus of the present invention, the determination unit detects a boundary between a bright region and a dark region in a region including the mouth of the PET bottle based on a light receiving state by the light receiving unit, and Based on this, the outer diameter of the mouth is measured.

  With this configuration, the outer diameter of the mouth can be grasped based on the boundary between the bright region and the dark region in the region including the mouth of the plastic bottle.

  In addition, the mouth inspection device of the present invention includes a discharge unit that discharges the PET bottle as a defective product when the determination unit determines that the outer diameter of the mouth is not within a predetermined reference range. It becomes composition.

  With this configuration, it is possible to easily remove defective PET bottles.

  Further, the mouth inspection device of the present invention is for inspecting the outer diameter of the mouth of the plastic bottle, the projecting step of projecting parallel light onto the region including the mouth of the PET bottle, and the projecting A light receiving step for receiving the parallel light that has been projected by the light step and passed through the region including the mouth portion of the PET bottle, and the outer diameter of the mouth portion is predetermined based on the parallel light received by the light receiving step. And a determination step of determining whether or not it is within the specified reference range.

  The present invention projects a parallel light to a region including a mouth portion of a PET bottle, and a reference range in which the outer diameter of the mouth portion is determined in advance based on the parallel light passing through the region including the mouth portion of the PET bottle. Therefore, it is possible to easily perform 100% inspection.

  Hereinafter, a mouth inspection device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a side external view of the mouth inspection device according to the embodiment of the present invention. The mouth inspection apparatus shown in FIG. 1 inspects the outer diameter of the mouth 601 of a plastic bottle 600, and includes a light projecting unit 100, a light receiving unit 200, a transport unit 500, and support members 802 and 804.

  The light projecting unit 100 projects parallel light onto a region including the mouth 601 of the plastic bottle 600. The light receiving unit 200 is disposed at a position facing the light projecting unit 100 with the mouth 601 of the PET bottle 600 interposed therebetween. The light receiving unit 200 receives the parallel light that has been projected by the light projecting unit 100 and that has passed through the region including the mouth 601 of the plastic bottle 600. The light projecting unit 100 and the light receiving unit 200 are screwed to the support member 802. Further, the support member 802 extends perpendicularly to the paper surface and is screwed to a support member 804 fixed to a casing (not shown) of the mouth inspection device. The transport unit 500 transports the plastic bottle 600 in a direction perpendicular to the paper surface, and arranges the mouth 601 of the plastic bottle 600 between the light projecting unit 100 and the light receiving unit 200.

  A block diagram of the mouth inspection apparatus is shown in FIG. The mouth inspection apparatus shown in FIG. 2 is a PET bottle 600-1 to 600-4 conveyed by the conveyance unit 500 (hereinafter, these PET bottles 600-1 to 600-4 are collectively referred to as “pet bottle 600” as appropriate). ) Each

The light projecting unit 100 that projects parallel light toward a region including the mouth parts 601-1 to 601-4 (hereinafter, the mouth parts 601-1 to 601-4 are collectively referred to as “mouth part 601” as appropriate). The light receiving unit 200 that receives the parallel light that is projected by the light projecting unit 100 and passes through the region including the mouth portion 601 of the PET bottle 600, and the PET bottle 600 based on the parallel light that is received by the light receiving unit 200. A controller 300 that inspects the outer diameter of the mouth 601 and a discharge unit 400 that discharges a defective plastic bottle 600 from the transport unit 500.

  The light projecting unit 100 includes light emitting diodes (LEDs) 101-1 to 101-3 (hereinafter, these LEDs 101-1 to 101-3 are appropriately referred to as “LEDs 101”), a diffusion unit 102, and a lens 103. .

  The LED 101 emits light by a current supplied from the outside. The diffusion unit 102 diffuses light from the LED 101. The lens 103 converts the light diffused by the diffusion unit 102 into parallel light. The parallel light from the lens 103 is projected toward a region including the mouth 601 of the plastic bottle 600 that is transported by the transport unit 500.

  The light receiving unit 200 includes a lens 201, a beam splitter 202, a lens 203, an image sensor 204, a lens 205, and a measurement CCD (Charge Coupled Devices) 206.

  The lens 201 projects the parallel light that is projected by the light projecting unit 100 and passes through the region including the mouth 601 of the plastic bottle 600. The beam splitter 202 separates light from the lens 201 into passing light and reflected light. The lens 203 converts the passing light from the beam splitter 202 into parallel light. The image sensor 204 has a structure in which photoelectric conversion elements such as complementary metal oxide semiconductors (CMOS) are arranged, and generates an analog electric signal corresponding to the amount of parallel light from the lens 203. ,Output. The lens 205 converts the reflected light from the beam splitter 202 into parallel light. The measurement CCD 206 has a structure in which photodiodes that are charge-coupled elements are arranged. The photodiodes accumulate charges corresponding to the amount of reflected light from the lens 205, and analog electrical signals corresponding to the accumulated amounts. Is generated and output.

  The controller 300 includes an A / D conversion unit 301, a frame memory 302, a monitor 303, an A / D conversion unit 304, a processor 305, and a CPU 306.

  The A / D conversion unit 301 converts an analog electric signal from the image sensor 204 in the light receiving unit 200 into digital data and outputs the digital data. The frame memory 302 stores the digital data from the A / D conversion unit 301. The monitor 303 performs image display based on digital data read from the frame memory 302 under the control of the CPU 305. The A / D conversion unit 304 converts an analog electrical signal from the measurement CCD 206 in the light receiving unit 200 into digital data and outputs the digital data. The processor 305 performs binarization processing corresponding to light and dark on the digital data from the A / D conversion unit 304, and detects the boundary between the light region and the dark region. The CPU 306 measures the outer diameter of the mouth 601 of the plastic bottle 600 based on the boundary between the bright area and the dark area. Further, the CPU 306 determines whether or not the measured outer diameter of the mouth portion 601 is within a predetermined reference range. If the measured outside diameter is not within the reference range, a signal indicating that the PET bottle 600 is a defective product ( A defective product detection signal) is output to the discharge unit 400.

  When the defective product detection signal is input, the discharge unit 400 extends the arm unit and discharges the defective plastic bottle 600 at the timing when the defective plastic bottle 600 is transported to the near side. Perform the action.

  The operation | movement at the time of the test | inspection of the mouth part 601 of the PET bottle 600 is demonstrated about the mouth part inspection apparatus comprised as mentioned above. FIG. 3 shows a flowchart of the operation during the inspection of the mouth 601 of the plastic bottle 600 of the mouth inspection device.

  The transport unit 500 transports the plastic bottle 600 between the light projecting unit 100 and the light receiving unit 200 (inspection position) (S101). Accordingly, the mouth 601 of the plastic bottle 600 is disposed between the light projecting unit 100 and the light receiving unit 200.

  The light projecting unit 100 projects parallel light toward the region including the PET bottle 600 mouth portion 601 (S102). Of the parallel light projected by the light projecting unit 100, all or most of the parallel light reaching the mouth 601 of the plastic bottle 600 is reflected by the mouth 601. On the other hand, among the parallel light projected by the light projecting unit 100, the parallel light reaching the periphery of the mouth portion 601 of the plastic bottle 600 passes as it is.

  The light receiving unit 200 receives the parallel light projected by the light projecting unit 100 and passed through the region including the mouth 601 of the plastic bottle 600 (S103). Further, the light receiving unit 200 generates an electrical signal corresponding to the amount of received parallel light (S104).

The controller 300 detects the boundary between the bright region and the dark region based on the electrical signal from the light receiving unit 200 (S105). As described above, of the parallel light projected from the light projecting unit 100, all or most of the parallel light reaching the mouth 601 of the PET bottle 600 is reflected by the mouth 601, and the mouth of the PET bottle 600 is opened. The parallel light that reaches the periphery of the part 601 passes as it is. The light receiving unit 200 receives a part of the parallel light reaching the mouth 601 of the plastic bottle 600 and the parallel light reaching the periphery of the mouth 601 of the plastic bottle 600. Therefore, the controller 300 performs binarization processing corresponding to light and dark according to the electrical signal from the light receiving unit 200, so that the mouth 601 of the plastic bottle 600 out of the region including the mouth 601 of the plastic bottle 600. An area corresponding to the area around the mouth 601 of the PET bottle 600 is identified as a bright area.

  Next, the controller 300 measures the outer diameter of the mouth 601 of the plastic bottle 600 based on the detected boundary between the bright region and the dark region (S106). As described above, the region corresponding to the mouth 601 of the PET bottle 600 is a dark region, and the region corresponding to the periphery of the mouth 601 of the PET bottle 600 is a bright region. Therefore, the boundary between the bright region and the dark region represents the outer shape of the mouth 601 of the plastic bottle 600, and the controller 300 can measure the outer diameter of the mouth 601 from the boundary between the bright region and the dark region. It becomes possible.

  Furthermore, the controller 300 determines whether or not the measured outer diameter of the mouth 601 is within a predetermined reference range (S107). The reference range means a range of the outer diameter of the mouth 601 that can handle the PET bottle 600 as a non-defective product.

  When the outer diameter of the mouth 601 is within a predetermined reference range, in other words, when the PET bottle 600 to be inspected is a non-defective product, the PET bottle 600 is inspected to be inspected. The operations after the conveyance (S101) are repeated.

  On the other hand, if the outer diameter of the mouth 601 is not within the predetermined reference range, in other words, if the PET bottle 600 to be inspected is a defective product, the controller 300 indicates that the PET bottle 600 is a defective product. A defective product detection signal is output to the discharge unit 400 (S108). When the defective product detection signal is input, the discharge unit 400 extends the arm unit and discharges the defective plastic bottle 600 at the timing when the defective plastic bottle 600 is transported to the near side. Perform the action.

  As described above, the mouth inspection apparatus according to the present embodiment projects parallel light onto a region including the mouth 601 of the PET bottle 600, receives parallel light that has passed through this region, and is based on the received parallel light. Then, it is determined whether or not the outer diameter of the mouth 601 is within a predetermined reference range, and when the outer diameter of the mouth 601 is not within the predetermined reference range, the mouth The plastic bottle 600 having 601 is discharged. For this reason, it is possible to easily perform 100% inspection without requiring manpower.

  As described above, the mouth inspection device and the mouth inspection method according to the present invention have an effect that it is possible to easily perform a complete inspection, and are useful as a mouth inspection device and a mouth inspection method.

It is a side external view of a mouth inspection device. It is a block diagram of a mouth inspection device. It is a flowchart of the operation | movement at the time of the mouth part test | inspection of the plastic bottle of a mouth part test | inspection apparatus.

Explanation of symbols

100 Emitter 101-1 to 101-3 LED
102 Diffusion unit 103, 201, 203, 205 Lens 202 Beam splitter 200 Light receiving unit 206 CCD for measurement
300 Controller 301, 304 A / D converter 302 Frame memory 303 Monitor 305 Processor 306 CPU
400 Discharging unit 500 Conveying unit 600-1 to 600-4 PET bottle 601-1 to 601-4 Mouth portion 802, 804 Support member

Claims (5)

A mouth inspection device for inspecting the outer diameter of the mouth of a PET bottle,
A light projecting means for projecting parallel light onto a region including the mouth of the plastic bottle;
A light receiving means that receives the parallel light that has been projected by the light projecting means and that has passed through the region including the mouth of the PET bottle;
A mouth inspection apparatus comprising: a determination unit that determines whether or not an outer diameter of the mouth is within a predetermined reference range based on parallel light received by the light receiving unit. The mouth inspection apparatus according to claim 1, further comprising a transport unit that transports the mouth of the plastic bottle between the light projecting unit and the light receiving unit. The determination unit detects a boundary between a bright region and a dark region in a region including the mouth portion of the plastic bottle based on a light receiving state by the light receiving unit, and measures an outer diameter of the mouth portion based on the boundary. The mouth inspection apparatus according to claim 1 or 2, wherein 4. The discharge device according to claim 1, further comprising a discharge unit configured to discharge the PET bottle as a defective product when the determination unit determines that the outer diameter of the mouth portion is not within a predetermined reference range. The mouth inspection device according to any one of the above. A mouth inspection method for inspecting the outer diameter of the mouth of a plastic bottle,
A light projecting step of projecting parallel light onto a region including the mouth of the plastic bottle;
A light receiving step of receiving the parallel light that has been projected by the light projecting step and has passed through the region including the mouth of the PET bottle;
And a determination step of determining whether or not the outer diameter of the mouth is within a predetermined reference range based on the parallel light received by the light receiving step.

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