JP2015169449A - Barrel diameter measuring apparatus for glass bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable highly-accurate measurement rarely affected by a mechanical vibration and a vibration caused by the rotation of a glass bottle, by receiving only parallel light regardless of a barrel diameter of a measured object.SOLUTION: A barrel diameter measuring apparatus 1 comprises: a star wheel 3 for successively sending a glass bottle 100; a drive wheel 60 that rotates the glass bottle 100; a projector 61 that is provided inside the star wheel 3 and irradiates the glass bottle 100 with light; a parabolic mirror 62 that is provided outside the star wheel 3 and reflects the light irradiated through the glass bottle; and a camera 64 that is provided outside the star wheel 3 and receives the irradiated light reflected from the parabolic mirror 62.

Description

  The present invention relates to a glass bottle barrel diameter measuring device including a camera and a parabolic mirror.

Generally, a glass bottle may be molded differently from a required standard due to, for example, non-uniformity of glass temperature at the time of molding or deformation that occurs before entering a cooling furnace. As one of the methods for detecting a glass bottle having such a defect, the body diameter measuring instrument measures the body diameter of the glass bottle (see, for example, Patent Document 1).
Conventionally, there are a contact method and a non-contact method for measuring the diameter of a glass bottle. In the contact method, the body diameter is measured by bringing the contact portion into contact with the glass bottle. In this contact method, since there is always contact with the glass bottle, parts are damaged or worn by an impact at the time of contact.
Further, the contact method cannot maintain measurement accuracy due to vibration caused by contact, and cannot measure depending on the part.
On the other hand, since the non-contact method can measure without contact, the glass bottle is not damaged during measurement. In the non-contact method, there is no vibration due to contact, and, for example, a line sensor camera performs measurement with light, so the measurement accuracy is high.

Japanese Patent Laying-Open No. 2005-091060

However, for example, in a laser scan micrometer that assumes that the relative position of the projector and the receiver is fixed and the core of the light beam does not shift, the relative position of the projector and the receiver is shifted due to mechanical vibration or vibration caused by the rotation of the glass bottle. Measurement is not possible with high accuracy.
Moreover, in order to measure the barrel diameter of the glass bottle with high accuracy, the light receiver needs to measure both ends of the barrel portion like a caliper by receiving parallel light out of the light emitted from the projector. However, in the case of a line sensor camera, for example, the larger the body diameter of the object to be measured, the more oblique the camera line of sight becomes and an error occurs in the measured values at both ends of the body.
The present invention has been made in view of the above-described circumstances, is not easily affected by mechanical vibrations and vibrations caused by the rotation of glass bottles, and receives only parallel light regardless of the body diameter of the measurement object. An object of the present invention is to provide a glass bottle diameter measuring device capable of high measurement.

In order to achieve the above object, the present invention provides a star wheel for intermittently feeding glass bottles, a drive wheel for rotating the glass bottles, and a star wheel provided outside the star wheel. A light projector that irradiates the glass bottle with light, a parabolic mirror that is provided outside the star wheel and reflects light irradiated through the glass bottle, and light reflected from the parabolic mirror. And a camera for receiving light.
In this invention, the barrel diameter measuring device is not easily affected by mechanical vibrations or vibrations caused by the rotation of the glass bottle, and can receive only the parallel light of the irradiation light from the projector regardless of the barrel diameter of the measurement object.
Therefore, since both ends of the barrel are measured like vernier calipers by receiving parallel light out of the light emitted from the projector, the barrel diameter of the glass bottle can be measured with high accuracy.

The parabolic mirror and the plane mirror may be supported by a pair of frames, and the parabolic mirror, the plane mirror, and the pair of frames may be formed in a frame shape.
The camera may be disposed on the parabolic mirror side.
In the present invention, when the optical system is configured, the parabolic mirror, the plane mirror, and the camera can be integrally held by using a pair of frames, so that the arrangement of the optical system can be facilitated, and the parabolic mirror and the plane mirror And camera optical alignment.
The projector may be a diffuse surface light source.
The camera has an area sensor camera function, takes an image as an area sensor camera at the time of initial setting, selects a predetermined line in the taken image, and measures the selected line during measurement of the diameter of the glass bottle. The image may be processed.

  According to the present invention, the barrel diameter measuring instrument is not easily affected by mechanical vibration or vibration due to the rotation of the glass bottle, and can receive only the parallel light of the irradiation light from the projector regardless of the trunk diameter of the measurement object. Highly accurate measurement is possible.

It is a top view of the trunk diameter measuring device concerning the present invention. It is a side view of the measuring apparatus in FIG. It is a top view of the measuring instrument in FIG. It is a figure which shows a camera image. A is a top view of the trunk diameter measuring device which shows another embodiment which concerns on invention, B is a side view of a measurement unit.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view of a bottle diameter measuring device 1 according to the present invention.
The body diameter measuring instrument 1 is rotated around the machine center 2 as a rotation axis, a star wheel 3 that sequentially and intermittently sends the glass bottles 100, a carry-in conveyor 4 that carries the glass bottles 100 into the star wheel 3, and a glass bottle 100. The unloading conveyor 5 which unloads from the star wheel 3, and the measurement unit 6 which measures the body diameter of the glass bottle 100 are provided.

The star wheel 3 is a disk-shaped wheel, and has eight concave grooves 3a at equal intervals in the circumferential direction. The star wheel 3 rotates counterclockwise in FIG. 1 with the machine center 2 being a rotatable vertical axis as a rotation axis. Further, as shown in FIG. 2, a pair of star wheels 3 is provided with a space in the vertical direction with respect to the machine center 2.
With this configuration, the pair of star wheels 3 receive the glass bottles 100 in the respective concave grooves 3a, support the body of the glass bottles 100 at two positions at an interval in the vertical direction, and stand the glass bottles 100 upright. It can be sent intermittently sequentially in a predetermined direction.

As shown in FIG. 1, the carry-in conveyor 4 carries in the pedestal 20 (see FIG. 2) under the star wheel 3 while sliding the glass bottle 100 in a standing state. The glass bottle 100 placed on the pedestal 20 is received in the concave groove 3 a of the star wheel 3. The star wheel 3 is intermittently driven counterclockwise.
When the glass bottle 100 reaches the position of the measuring unit 6, the star wheel 3 is temporarily stopped. While receiving the measurement by the measurement unit 6 at this position, the glass bottles 100 are sequentially and intermittently sent counterclockwise.
When the glass bottle 100 reaches the position of the carry-out conveyor 5, it is transferred to the carry-out conveyor 5 and sent out of the star wheel 3.

The measuring unit 6 measures the diameter of the glass bottle 100 that is sequentially sent by the star wheel 3. As shown in FIGS. 2 and 3, the measurement unit 6 is located inside the star wheel 3 and the drive wheel 60 that rotates the glass bottle 100 placed on the pedestal 20 around the bottle axis C. A projector 61 for irradiating light toward the body of the lens, a parabolic mirror 62 for receiving parallel light transmitted from the projector 61 and passing through the body of the glass bottle 100, and the parabolic mirror 62 and a glass bottle 100, and includes a plane mirror 63 that receives the light reflected by the parabolic mirror 62, and a camera 64 that captures the light reflected by the plane mirror 63.
The parabolic mirror 62 and the plane mirror 63 are supported by a pair of frames S2, and the parabolic mirror 62, the plane mirror 63, and the pair of frames S2 are formed in a frame shape. A camera support S1 is provided at the center of the parabolic mirror 62, and a camera 64 is disposed on the camera support S1.
In this configuration, the parabolic mirror 62, the plane mirror 63, and the camera 64 can be integrally held by using the pair of frames S2 when configuring the optical system. Therefore, the arrangement of the optical system is facilitated. Optical alignment of the paraboloidal mirror 62, the plane mirror 63, and the camera 64 is performed, and the camera 64 is fixed by the camera support portion S1 to facilitate the centering.

  As shown in FIG. 1, the star wheel 3 has two star wheel rollers 7 in each concave groove 3 a. In the measurement unit 6, the glass bottle 100 that has entered the concave groove 3 a of the star wheel 3 is placed between the two star wheel rollers 7 and the drive wheel 60 in a state of being placed on the pedestal 20. As shown in FIG. 2, the drive wheel 60 is provided outside the star wheel 3, and rotates itself to rotate the glass bottle 100 around the bottle axis C in cooperation with the star wheel roller 7.

The projector 61 is a surface illumination device that irradiates light. In order to irradiate through a glass bottle, as shown in FIG. 1, the projector 61 is supported by a projector support tool 61 </ b> A and includes an upper star wheel 3 and a lower star wheel 3. Between. The light source of the projector 61 is a diffusing surface light source whose luminance does not change when viewed from any direction.
As shown in FIG. 3, the parabolic mirror 62 is a concave mirror having a parabolic reflecting surface. In this configuration, a belt-like parabolic mirror is employed.
The plane mirror 63 is a belt-like mirror having a flat reflecting surface. The camera 64 is provided so that the light reflected by the plane mirror 63 is received.

The camera 64 described above is a line sensor camera. This line sensor camera is a camera in which light receiving elements are arranged in a one-dimensional line, and captures an image with a line and has a higher resolution than a normal camera.
In the present embodiment, the camera 64 may have the function of an area sensor camera. That is, as shown in FIG. 4, at the initial setting stage of the measurement unit 6, the camera 64 is caused to function as an area sensor camera. The area sensor camera is a camera in which the light receiving elements are arranged in a two-dimensional plane and the image is captured by the plane M. The surface M is composed of 1024 × 768 pixels in the horizontal and vertical directions. The camera 64 causes the image to be captured on the surface M, and in the surface image M, desired measurement lines L10, L11, and L12 corresponding to the body portion of the glass bottle 100 are selected.
The measurement line can be selected from one line or a plurality of lines.
The camera 64 is caused to function as a line sensor camera based on the selected one or a plurality of measurement lines L10, L11, and L12 at the time of measurement.
When the camera 64 is a single-function line sensor camera, setting for centering the measurement line with respect to a desired barrel of the glass bottle 100 is difficult. On the other hand, if the camera 64 has the function of the area sensor camera and the desired measurement line L10, L11, L12 corresponding to the body of the glass bottle 100 is selected in the acquired surface image M, the selection operation is performed. Thus, the measurement line can be centered with respect to a desired body portion of the glass bottle 100, and the setting of the measurement line can be facilitated.

Next, the measurement unit 6 will be described.
As shown in FIG. 2, the glass bottle 100 is supported by the upper star wheel 3 and the lower star wheel 3 while standing on the pedestal 20. In this measurement unit 6, the glass bottle 100 rotates around the axis C, and light is irradiated to the body of the rotating glass bottle 100 from the projector 61 inside the star wheel 3.

The body diameter of the glass bottle 100 is measured based on the parallel light L1 passing through both ends of the glass bottle 100 as shown in FIG. In FIG. 3, the optical path arrow is indicated by the line of sight of the camera 64.
The parallel lights L1 and L2 from the projector 61 pass straight through the barrel of the glass bottle 100, pass under the plane mirror 63, and reach the parabolic mirror 62. The parabolic mirror 62 reflects light slightly upward, and the reflected light reaches the plane mirror 63. That is, in the light irradiated from the projector 61 through the glass bottle, only the parallel lights L1 and L2 that have passed through both sides of the glass bottle 100 are reflected by the belt-like parabolic mirror 62, and the reflected light reaches the plane mirror 63. To do.
Then, the light reflected by the plane mirror 63 is imaged on the camera 64.
The image formed on the camera 64 is composed only of parallel lights L1 and L2 that have passed through both ends of the barrel of the glass bottle 100, and a pair of parallel lights L1 that have passed through the barrel of the glass bottle 100 like calipers. And the barrel diameter of the glass bottle 100 is measured based on this specification.

According to this embodiment, the barrel diameter measuring instrument 1 of the glass bottle 100 includes a star wheel 3 for sequentially and intermittently feeding the glass bottle 100, a drive wheel 60 for rotating the glass bottle 100, and a star wheel. 3, a projector 61 for irradiating the glass bottle 100 with light, a parabolic mirror 62 provided outside the star wheel 3 for reflecting the light irradiated through the glass bottle, and the outside of the star wheel 3. And a camera 64 that receives the irradiation light reflected from the parabolic mirror 62.
Thereby, the trunk diameter measuring device 1 is provided by separating the projector 61 and the camera 64, and the parabolic mirror 62 forms an image of only the parallel light in the irradiation light from the projector 61 on the camera 64. Since the camera 64 is provided outside the star wheel 3, the camera 64 is not easily affected by the vibration of the star wheel 3 or the vibration caused by the rotation of the glass bottle 100, thereby enabling stable measurement.
On the other hand, as shown in FIG. 1, the projector 61 is supported by a projector support tool 61 </ b> A and is disposed inside the star wheel 3. However, since the projector 61 is a surface illumination device that irradiates light, even if the projector 61 is arranged inside the star wheel 3 and the projector 61 vibrates, there is little influence on the measurement accuracy.

According to the present embodiment, the camera 64 can set a plurality of measurement lines (see FIG. 4). Thereby, since the measurement width is widened, the barrel diameter measuring device 1 can detect the depression or bulge of the barrel portion of the glass bottle 100 that is difficult to detect by one line measurement.
According to the present embodiment, the light source of the projector 61 is a diffusing surface light source. Thereby, even if the projector 61 receives vibration, since the change in the amount of light received by the camera 64 is small, the trunk diameter measuring device 1 can accurately measure without causing a large measurement error.

5A and 5B show another embodiment. 5, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
This embodiment is different from the embodiment of FIG. 1 in the arrangement of optical system functional components in the measurement unit 6. That is, as shown in FIG. 5B, the drive wheel 60 that rotates the glass bottle 100 placed on the pedestal 20 around the bottle axis C and the star wheel 3 are positioned on the inside of the star wheel 3, and light is directed toward the body of the glass bottle 100. And a parabolic mirror 62 that receives the parallel light that has passed through the body of the glass bottle 100 and is emitted from the projector 61. In the present embodiment, a camera 64 is disposed between the parabolic mirror 62 and the glass bottle 100, and the plane mirror 63 in FIG. 1 is omitted.

  In this embodiment, the parallel light from the projector 61 reflected from the parabolic mirror 62 is directly imaged on the camera 64. In this case, the camera 64 is provided outside the star wheel 3. Since the camera 64 is provided outside the star wheel 3, it is not affected by the vibration of the star wheel 3 or the vibration of the rotation of the glass bottle 100. Therefore, stable measurement by the camera 64 is possible.

In each embodiment mentioned above, it illustrated so that the measurement unit 6 might be provided in the position near the carrying-in conveyor 4 which conveys the glass bottle 100 to the star wheel 3. FIG. However, it is not necessarily provided at a position close to the carry-in conveyor 4, and the measurement unit 6 may be provided between the carry-in conveyor 4 and the carry-out conveyor 5.
Moreover, in each embodiment, in order to measure the both ends of the trunk | drum of the glass bottle 100 like a caliper by receiving parallel light L1, L2 among the irradiation lights from the light projector 61, the cylinder diameter of the glass bottle 100 is measured. Can be measured with high accuracy.
The above-described embodiments are merely illustrative of one aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Body diameter measuring device 3 Star wheel 3a Groove 6 Measuring unit 60 Drive wheel 61 Projector 62 Parabolic mirror 63 Plane mirror 64 Camera 100 Glass bottle

Claims (5)

  A star wheel for intermittently sending a glass bottle, a drive wheel for rotating the glass bottle, and a projector provided inside the star wheel and irradiating the glass bottle with light toward the outside of the star wheel And a parabolic mirror that is provided outside the star wheel and reflects the light irradiated through the glass bottle, and a camera that receives the light reflected from the parabolic mirror. Glass bottle body diameter measuring instrument.   The parabolic mirror and the plane mirror are supported by a pair of frames, and the parabolic mirror, the plane mirror, and the pair of frames are formed in a frame shape. Glass bottle body diameter measuring instrument.   The glass bottle barrel diameter measuring instrument according to claim 1 or 2, wherein the camera is disposed on the parabolic mirror side.   The glass bottle body diameter measuring device according to any one of claims 1 to 3, wherein the projector is a diffusing surface light source.   The camera has an area sensor camera function, takes an image as an area sensor camera at the time of initial setting, selects a predetermined line in the taken image, and measures the selected line during measurement of the diameter of the glass bottle. The glass bottle barrel diameter measuring device according to any one of claims 1 to 4, wherein an image is processed.

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