JPH0336165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bottle mouth shape inspection device that can accurately inspect whether the top end surface of a bottle mouth is formed into an appropriate shape. It is something.

(Prior art) In order to ensure sealing performance, the upper end surface of the mouth of a bottle is strongly required to be free of irregularities and to lie within a plane perpendicular to the central axis of the bottle. As shown in Publication No. 40-5115, a pair of rollers is brought into contact with the top surface of the mouth of a rotating bottle, and the shape of the top surface of the mouth is inspected by detecting the vertical movement using a differential transformer, etc. There are known devices that do this. However, this device has the disadvantage that when the rotational speed of the bottle is increased, the roller cannot follow the shape of the upper end surface of the mouth, so the inspection speed is slow, and bottles with small diameters cannot be inspected.

(Object of the Invention) The present invention solves these conventional problems, and provides a bottle mouth that allows the shape of the upper end surface of a bottle mouth to be inspected with high precision and at high speed, regardless of its diameter. It was completed for the purpose of being a shape inspection device.

(Structure of the Invention) The present invention provides an irradiation body insertion mechanism for inserting an irradiation body that irradiates parallel light from inside to the mouth of the bottle above the bottle rotation mechanism that rotates the bottle around its central axis. At the same time, on the side thereof, a light receiver is provided with a linear field of view for detecting the height of the upper end surface of the mouth irradiated from the inside with parallel light from the irradiator, Hereinafter, a detailed explanation will be given with reference to illustrated embodiments.

In the figure, 1 is a bottle rotation mechanism that rotates the bottle 20 around its central axis, and 2 is an irradiator 3 that irradiates the mouth 21 of the bottle with parallel light from inside, and is perpendicular to the mouth 21 of the rotating bottle 20. This is an irradiator insertion mechanism provided above the bottle rotation mechanism 1 for insertion. The bottle rotation mechanism 1 can be of any type, and the irradiator insertion mechanism 2 is also the same as the bottle rotation mechanism 1.
Any mechanism that can move the irradiator 3 up and down in synchronization with the loading and unloading of the bottle 20 can be used. In the illustrated embodiment, a plane mirror that reflects parallel light rays from the outside toward the mouth portion 21 is used as the illumination body 3, but a light emitting source capable of emitting parallel light rays may also be used. In the example, the bottle rotation mechanism 1
A projector 4 is provided on the side of the irradiator 3 inserted into the opening 21 to emit a parallel beam of light from slightly obliquely upward, and the parallel rays reflected by the irradiator 3 are used to illuminate the irradiator 3 from inside. This mouth part 2
A photodetector 5 for detecting the height of the upper end surface of the photodetector 1 was provided.
The light receiver 5 may be a camera having a linear field of view with a length of 5 mm, for example, and a light receiving section in which 512-bit photosensitive elements are densely arranged within the field of view.
In this case, a resolution of approximately 0.01 mm will be obtained. The light receiver 5 is set slightly upward so that when the upper end surface of the mouth portion of the bottle 20 is properly formed, the image of the upper end surface of the mouth portion 21 irradiated from the inside with parallel light beams is positioned approximately in the center of the field of view. Ru. The light receiver 5 includes a light receiver driver 6 for sequentially outputting the optical signals stored in the light receiver, an amplifier 7 for amplifying the output signal of the light receiver 5, and an output signal of 0 or 1.
a binarization circuit 8 for binarizing the output signal, a gate circuit 9 for synchronizing the binarized output signal with timing signals from the bottle rotation mechanism 1 and the irradiator insertion mechanism 2, and a gate circuit 9 for synchronizing the output signal with the set value. Judgment circuit 10 that compares and judges good or bad, bottle 2 judged to be defective
Exclusion mechanisms 11 and the like for eliminating zeros from the line are sequentially connected, but these are all well known to those skilled in the art, so detailed explanations will be omitted.

The bottle rotation mechanism 1 configured in this way is
While placing the bottle 20 and rotating it around its central axis, the irradiator 3 is inserted into the opening 21 by the irradiator insertion mechanism 2 provided above the bottle rotation mechanism 1, and a parallel beam of light is emitted from the projector 4. The mouth part 21 is irradiated from the inside with parallel light beams projected and reflected by the irradiator 3, and the height of the upper end surface of the mouth part 21 is determined by the light receiver 5 provided on the side with a linear field of view. When the upper end surface of the mouth part 21 has no irregularities and the upper end surface is in a plane perpendicular to the central axis of the bottle 20, even if the bottle 20 is rotated, the linear field of view of the light receiver 5 will be detected. There is no change in the height of the upper end surface of the mouth portion 21, which is detected as the boundary between the light-receiving portion and the non-light-receiving portion. However, if the upper end surface of the mouth part 21 is uneven or the upper end surface is
When the bottle is tilted with respect to the central axis of the bottle, the height of the upper end surface of the mouth portion 21 detected by the linear field of view of the light receiver 5 changes as the bottle 20 rotates, so the state of the change can be observed. Compare with the set value and reject bottles that are outside the tolerance range as defective bottles. In this way, the mouth part 21 is irradiated from the inside by the parallel light beam from the irradiator 3 inserted therein, so the height of only the upper end face on the receiver 5 side can be accurately detected, and its accuracy As mentioned above, it is possible to easily achieve a diameter of about 0.01 mm, and it is not affected by the size of the diameter. In addition, when a reflecting mirror is used as the irradiator 3 as in this embodiment, the irradiation angle of the parallel light beam can be maintained constant even during the vertical movement of the irradiator 3, so inspection can be carried out even during the vertical movement of the irradiator 3. This is possible, and the number of inspections per unit time can be further increased.

(Effects of the Invention) As is clear from the above description, the present invention is capable of accurately inspecting the shape of the upper end surface of the mouth of a bottle, regardless of the size of the mouth. It is possible to inspect the entire length of the bottle as well as irregularities, inclinations, etc. Moreover, unlike the conventional roller contact type, the inspection speed can be significantly improved, which eliminates the drawbacks of conventional inspection devices of this type. This is an extremely important contribution to the development of the industry as a solution to the problem.

[Brief explanation of drawings]

The drawing is a block diagram showing an embodiment of the invention. 1: Bottle rotation mechanism, 2: Irradiation object insertion mechanism, 3:
Irradiator, 5: Light receiver.

Claims (1)

[Claims] 1. An irradiator insertion mechanism 2 for inserting an irradiator 3 that irradiates parallel light beams from the inside to the mouth of the bottle is provided above the bottle rotation mechanism 1 that rotates the bottle around its central axis, and on the side thereof. is equipped with a light receiver 5 having a linear field of view for detecting the height of the upper end face of the mouth irradiated from the inside with parallel light from the irradiator 3. Device.