JPS5928857B2 - Inspection method for bottle bottom scratches - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bottle bottom flaw inspection method for inspecting flaws caused by burrs or bubbles occurring on the bottom of a bottle to be inspected.

It was difficult for the detector located above the mouth of the bottle to detect scratches caused by cracks or air bubbles occurring on the bottom of the bottle due to the transmitted light from the projector that illuminated the bottom of the bottle to be inspected from below. The present invention enables reliable and easy inspection of bottle bottom flaws by reflecting light emitted from below the bottom of the bottle at the interface of the flaw on the bottle bottom, and using a detector to detect the reflected light emitted to the side of the bottle bottom. The present invention provides a method for inspecting bottle bottom flaws.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a plan view of the inspection machine used therein, and FIGS. 2a and 2b are a sectional view showing details of the detection section and a sectional side view of the section. In FIG. 1, reference numeral 1 denotes a main body frame of the detector, and a bottle conveyor 2 is provided passing through the frame. 3 is a fixed guide of the bottle rotation transfer device provided on the main body frame 1;
is a bottle rotation transfer belt of a bottle rotation transfer device that is provided at a position corresponding to the fixed guide 3 across the bottle transfer path 5; The bottle to be inspected passing through the bottle transfer path 5 is rotated and moved by the transfer belt 4.

Reference numeral 6 denotes a bottle bottom irradiation projector disposed below one side of the bottle transport path 5, and half of the bottom of the bottle to be inspected is illuminated from below by this projector 6.

T is a side light receiver for receiving reflected light from the side of the bottle bottom, which is disposed on the side of the bottle transfer path 5 on the opposite side to the side where the projector 6 is arranged, and is a side light receiver for receiving reflected light from the side of the bottle bottom. The reflected light emitted to the side of the bottle bottom is received and detected. Reference numeral 8 denotes a bottle removal star wheel for removing defective bottles, which has a built-in suction means, for example, and removes defective bottles from the bottle transfer path 5 by suctioning them.

9 is an accumulator table that collects removed defective bottles.

As shown in FIGS. 2a and 2b, friction members 11 such as felt are attached to the surfaces of the fixed guide 3 and the transfer belt 4, respectively, so that the bottle 10 to be inspected can be reliably applied with rotational force without slipping. .

In addition, a dead plate 12 is installed on the side of the bottle transfer path 5 on the opposite side to the floodlight 6 located on one side of the bottle transfer path 5, and is used to receive the bottle 10 and block the irradiation light to one side of the bottom of the bottle. The irradiated light from the projector 6 is made sure to enter only half of the bottom of the bottle. The side light receiver 7 is composed of a plurality of analysis cells 13 arranged in a line along the bottle transfer path 5, and detects bottle bottom scratches 1 at any point along the bottle transfer path 5.
4, even if reflected light occurs, it can be reliably captured at that position. Further, a light shielding plate 15 is provided below the fixed guide 3 on the side of the bottle transfer path 5 on the opposite side to the side where the analysis cells 13 are arranged, to prevent the analysis cells 13 from operating unexpectedly due to disturbances. are doing. 16 is a bottle opening detection light emitter, 17 is a bottle opening detection light receiving cell, and detection cell 13
They are provided in the same number corresponding to each other.

18 is a bottle mouth detector holder.

When the bottle 10 to be inspected is now being transferred on the bottle conveyor 2 and is about to be stamped by the inspection machine, it is guided between the bottle rotating transfer belt 4 and the fixed guide 3, and the bottle 10 remains upright and is placed on the dead plate 12. The bottle passes through the bottle transfer route 5 while rotating. If a scratch 14 on the bottom of the bottle is detected by any one of the analysis cells 13, the bottle 10 to be detected is suctioned and held on the star wheel 8 by the suction means installed on the bottle removal star wheel 8. , are carried up to the accumulator table 9 and released and accumulated. The normal bottles are carried out on the conveyor 2. Detection of bottle bottom scratches is carried out on bottle transport conveyor 2.
Approximately half of the bottom of the bottle 10 that has protruded from the bottle is illuminated by the projector 6 provided below, and if there is a scratch 14 on the bottom of the bottle,
In the second case, the light from below is reflected and passes laterally through the bottom of the bottle and reaches the analysis cell 13.

In reality, the positions and angles of the scratches 14 vary, and the reflected light passes through the glass layer on the bottom of the bottle, reaches at least one analyzer cell 13 on the side of the bottom, and is received.
There are very few cases where there is a scratch 14 where no reflected light comes out on the side surface. In the present invention, the bottle rotation mechanism allows the bottle 10 to be rotated at least once to receive light. Reference numerals 16 and 17 detect the opening of the bottle using a photoelectric method. 3. Therefore, when the light beam generated from the projector 16 is blocked by the opening of the bottle before reaching the light receiving cell 17, a signal is generated, which causes the detection cell to detect the opening of the bottle. A synchronizing signal for signal switching of 13 signals is obtained.

On the other hand, the determination result of bottle bottom damage is stored in four predetermined bits corresponding to a predetermined analysis cell group of a shift register, and the contents of the shift register are sequentially shifted as the bottle is moved by a shift register control signal of a synchronization signal. When the bottle 10 reaches the outlet of the bottle rotation transfer mechanism, it is output from the shift register synchronously, and if the bottle 10 is a defective product, it is removed by the bottle removal mechanism. Even if a large number of bottles 10 to be inspected pass through the bottle 10 in succession, the bottles 10 to be inspected are inspected and removed even if only one bottle passes through the bottle. Figure 3 shows a block diagram of a circuit system based on the above system, where S1 to S2 are the analysis cells corresponding to 13, A is an analog switch which is a non-contact switch, and B1 to B2l are selected by analog switch A. For example, 4 consecutive
The adder B1 adds the outputs of the detection cells S1 to S4, and the adder B2 adds the outputs of the detection cells S2 to S4.
The outputs of S5 are subsequently added in the same manner.

C1 to C2l are determiners that compare the output of each adder B1 to B2l with a set value, and when the adder output exceeds the set value, each bit of the shift register D corresponding to each determiner C1 to C2l is Memorize it. T1-T25
is the light receiving cell corresponding to 17, E is each light receiving cell T1 to T2
This is a synchronization signal generation circuit that generates a synchronization signal for signal switching from 5 to 5. One of the synchronization signals controls analog switch A as an analog switch control signal a, and another synchronization signal whose phase lags that of the analog switch control signal a is generated. clocks shift register D as shift register control signal b. The above example shows an example of a method in which the bottle to be inspected is detected while it is being continuously transported while being rotated by a belt type. However, the bottle handling mechanism temporarily stops the bottle transport, rotates the light source and light shielding plate, and detects the bottle bottom. Similar detection is possible by inserting a detection cell into the side and switching the analysis cell in synchronization with the rotation of the light source.

At this time, when a judgment signal for detecting a defective bottle is sent, the third bottle can be picked up by the bottle removal solenoid and held mechanically.
The shift register shown in the figure can be omitted. It goes without saying that detection can also be made by rotating the bottles one by one at the stop position. According to the present invention,
Since light is irradiated from the bottom of the bottle to be inspected while it is being rotated to detect the presence or absence of scratches due to cracks or bubbles on the bottom of the bottle, the entire bottom of the bottle can be easily inspected with one irradiation light source. In addition, the inspection light illuminates only half of the bottom of the bottle due to the dead plate installed on the irradiation light detection side.
It is possible to prevent unnecessary light reflected from the bottom surface of the bottle from reaching the detection side, and therefore it is possible to reliably detect cracks or bubbles.

[Brief explanation of drawings]

FIG. 1 is an overall plan view showing an embodiment of the inspection machine used in the present invention, FIGS. 2A and 2B are a cross-sectional view of FIG. FIG. 3 is a block diagram of a detection circuit. 2...Bottle transport conveyor, 3...Fixed guide, 4...Transfer belt for bottle rotation, 5...
... Bottle transfer route, 6... Floodlight for illuminating the bottom of the bottle, 7
......Side receiver, 12...Det plate, 13...Analysis cell, 14...Scratches on the bottom of the bottle, 15...Light shielding Board.

Claims (1)

[Claims] 1. Light is irradiated from below to the bottom of the bottle to be inspected as it is rotated along the bottle transfer path, and the light is reflected from the interface of cracks or bubbles that have occurred on the bottom of the bottle. A flaw on the bottom of the bottle is detected by detecting the light emitted toward the bottle, and the irradiation light is blocked by approximately half of the bottom of the bottle by a dead plate provided on the irradiation light detection side of the bottle transport path. Method for inspecting bottle bottom scratches.