JPH10288564A - Electrode sensor device for inspecting pinhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To judge the presence or absence of a pinhole and a defective seal on a sealed packaging container. SOLUTION: This electrode sensor device is provided with correcting gears 10a, 10b concurrently pinching the surface and back face of a sealed packaging container 1 under conveyance while being rotated, correcting the warp or twist of a seal flange, and flattening an inspection face, the first electrode 20 applying a voltage to the container 1 in contact with it, a pair of the second electrodes 21 receiving the applied voltage in contact with the fixed position of the sealed packaging container 1 while the first electrode 20 applies the voltage to the container 1 in contact with it, a power supply 25 and wires 23, 24 feeding the voltage to them, and a detection control circuit 26 detecting an electric change. The presence or absence of a defect on the sealed packaging container 1 can be quickly found.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinhole inspecting apparatus for inspecting sealing defects such as pinholes in various types of hermetically sealed packaging containers formed of resin and filled with foods, cosmetics, or chemicals. It is about.

[0002]

2. Description of the Related Art An electrode sensor of a conventional pinhole inspection apparatus is, for example, a chain curtain sensor (Japanese Patent Publication No. 50-69).
98) Flexible contact type electrodes or non-contact type needle holding electrodes (JP-B-55-19490) are known.

In general, in the case of a fixed product having a small irregularity on the outer surface of the subject, a non-contact fixed electrode sensor which detects the sensor while keeping a small gap with the subject is sufficient. Curtain-like or flexible plate-type brush contact type sensors are frequently used.

[0004]

SUMMARY OF THE INVENTION A pillow package, three sides,
In the case of a product having an outer peripheral seal flange such as a four-way packaged product, this portion is warped 1a or bent 1b as shown in FIGS.
Many are extremely deformed like. To detect and inspect these deformed parts, it is not impossible to select the processing speed of the system as infinitely slow as possible and carefully detect the deformed parts with a flexible plate-like brush sensor, etc. In the case of processing at an economical speed, there is a problem that it is extremely difficult to perform appropriate detection and inspection by following the irregular-shaped seal flange, and there has been a strong demand for improvement.

[0005]

SUMMARY OF THE INVENTION The present invention corrects an irregularly deformed portion of a seal flange to a state close to a flat surface, and at the same time, applies a voltage to the deformed portion with an electrode to detect a seal defect such as a pinhole. The following configuration is provided as means for this. (1) A configuration in which the subject being transported is lightly sandwiched from the front and back in the system of the subject transport apparatus, and a mechanism for holding the deformed portion of the entering subject while passing the deformed portion is used. A pair of symmetrical swinging members having a function of correcting the deformed portion so that the deformed portion is nearly horizontal and having a function of following the body portion of the subject according to its thickness after passing through the deformed portion. (2) a first electrode made of a flexible material, which is disposed close to the shaft of the correction gear and is configured to make uniform contact with the surface until the subject passes from entry to passing; A second electrode made of a flexible material, which is arranged so that the subject always uniformly contacts the entire back surface of the subject during the passage,
(3) a power supply for supplying a constant voltage to one of the first and second electrodes; and (4) a circuit for detecting an electrical change in a circuit connecting the first or second electrode. . (Corresponding to Claims 1 and 2) (5) Further, in Claims 1 and 2, the first electrode is separately arranged at a position close to the correction gear. A set of rotary cylindrical electrodes coaxial and concentric with the correction gear configured to extend over the entire width of the conveying surface with a diameter larger than that of the correction gear by a flexible wire radially fixed to the first electrode. You can also. (Corresponding to claims 3 and 4)

BEST MODE FOR CARRYING OUT THE INVENTION

【Example】

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of the present invention, and FIG. 2 is a plan view of the same.
The roller 6 is a forced feed roller arranged at a height slightly lower than the average thickness of the subject 1 together with the roller 4 at the symmetric position. 1 also has a function of leveling irregularities on the front and back surfaces.

Reference numerals 10a and 10b denote correction gears of a seal deforming portion, which is the core of the present invention. The correction gears 10a and 10b are provided on a rotating shaft 12 rotatably supported at the tips of levers 11a and 11b which oscillate within a range of an angle α. A plurality of these are fixed, and these are rotated in the R direction in the figure at a peripheral speed sufficiently higher than the transport speed V of the subject 1 by the electric motor 19 and the driving systems 13, 14, 15, 16 and 18.

The reference numerals 17a and 17b guarantee the movement of the swing support 11 at the swing angle α, and when the subject 1 starts to enter, as shown in FIG. Therefore, when the main body of the subject 1 passes, a spring mechanism is provided which smoothly assists in lightly contacting and rotating the front and back of the subject 1 while being opened by the angle α as shown in FIG.

Reference numeral 20 denotes a first electrode, which extends in the shape of a chain of a conductive material having a minute dimension and extends over the entire width of the conveying surface, and is disposed close to the correction gear shaft 12 as shown in the figure, and has a tip portion. During the passage of the subject 1, the entire surface is uniformly contacted. Reference numerals 21 and 22 denote a pair of second electrodes, which are formed in a plate shape by densely forming innumerable small-diameter wires of a conductive flexible material, extend over the entire width of the transport surface, and the first electrode is connected to the subject. 1 while being in contact with the front surface of the subject 1 at the same time.

Reference numerals 23 and 24 denote a power supply 25 and a detection control circuit 2.
6 and a circuit connecting the first electrode 20 and the second electrodes 21 and 22. In the present embodiment, a voltage is applied to the surface of the subject 1 from the power supply 25 by the first electrode 20 and the second electrode receiving this voltage.
The detection control circuit 26 captures an electrical change input from the electrodes 21 and 22 to achieve the intended purpose.

FIG. 3 is a bird's-eye view of a representative example of a pillow-packaged product that mainly packs an aqueous food to be inspected according to the present invention, and FIG. 4 is a side view of the same. Peripheral seal collar 1o
Although the warp 1a and the bend 1b are illustrated by severe deformation examples of the portions viewed from arrows A and B, such examples are not uncommon.

Next, the effects of the first embodiment will be described with reference to the mechanism and operation of the present invention. FIGS. 5 and 6 show that, after the subject 1 starts to enter the correction gear 10, the seal deforming flange 1 a is sandwiched by the teeth of the gear 10 so as to be gradually flattened and finally flattened by both gears. 6 illustrates a state change during correction. As a condition for this, the rotational peripheral speed of the gear 10 needs to be selected to be appropriately faster than the transport speed V of the subject 1.

Here, as shown in FIG.
The flat seal portion sandwiched between zeros makes efficient contact with the seal surface while being flat while passing by the standby chain curtain electrode 20, and can apply a voltage to every corner of the entire surface with high probability. .

After the application of the seal portion is completed as the subject 1 advances, while the correction gear 10 is in contact with the subject 1 in the state shown in FIG. 1, the body surface of the subject 1 is continuously applied. Next, after the application of the body part of the subject 1 is completed, the voltage is reliably applied to the entire surface by the first electrode 20 in the same manner as at the time of the entry, while the correction gear 10 corrects the deformation of the rear seal part 1o.

[0015] The second electrode disposed in the illustrated important portion of the transfer device from the time when the subject 10 enters the device to the time when the passage of the subject is completed, that is, while the first electrode 20 applies the entire surface of the surface. In response to the application of the voltage to the front surface, 21 reliably receives the voltage from the back surface and completes the predetermined detection inspection work.

One of the first electrode 20 and the second electrode 21 applies a constant voltage to one of the electrodes, and the other receives the voltage to detect an electrical change such as a current flowing through the subject and detect and inspect a seal failure or the like. However, here, as a general practice, the first electrode 20 to which contact can be applied with fine-grained details is defined as the plus side, and the minus receiving side is defined as the second electrode.

The embodiment and the operation utility of the first embodiment have been described above. In addition to this, the fourth application embodiment is different from the first embodiment on the basis of FIGS. It will be explained based on. [Second embodiment]

FIG. 7 shows a correction gear 3 according to a second embodiment of the present invention.
0 is illustrated. Comparing the straightening gear 30 with the straightening gear 30 in the drawing as it is from the above-mentioned 10 of the first embodiment, as the deformation correcting ability of the subject seal portion 1o, the radial bar seals the concave and convex teeth of the gear to the extent that it is deeper. It has the characteristic that it can demonstrate its ability to correct large deformation of the part. [Third Embodiment]

FIG. 8 shows a third embodiment of the present invention, in which the first electrode is coaxial with both correction gears 10 and has a cylindrical shape whose outer diameter is slightly larger than the gears. It is characterized in that it is formed in a spiral shape with 32 groups, and the voltage is applied simultaneously with the correction of the deformed portion while the subject 1 is sandwiched between the cylindrical electrode and the correction gear 10 from the front and back. FIG. 9 is a plan view showing a state where the cylindrical electrode 32 and the correction gear 10 are combined.

FIG. 10 shows a cylindrical electrode with a correction gear having the same function as that of the third embodiment in which the cylindrical electrode 32 and the radial bar correction gear 30 of the second embodiment are combined. [Fourth Embodiment]

Although not shown, the cylindrical electrode 3 shown in FIG.
Reference numeral 3 denotes a fourth embodiment of the present invention in which the element wire 32 made of a conductive flexible material is formed in a spiral shape, and the element wire 32 is formed in a linear shape radiating from the shaft 12. The functions and effects in this case are substantially the same as in the third embodiment.

[0022]

The present invention is embodied in the form described above and exhibits the following effects.

The problem of the voltage application type pinhole inspection apparatus is that, for example, when a resin packaged product is to be inspected, both the breakdown voltage value of a generally used packaging resin material having a thickness and the normally applied voltage value for inspection are both required. Normally, they are quite close to each other at around 10 kV. Conventionally, depending on the set voltage applied, there have been sporadic cases where the inspection machine becomes an assailant in drilling a pinhole in a normal container.

The key to clearing these rigorous use conditions is to provide sufficient inspection performance with an applied voltage which is simple and much lower than the breakdown voltage of the subject. Also,
The key depends on how the electrodes can be applied in contact with the entire surface of the test surface of the subject. It is well known that the contact efficiency and the applied voltage are in inverse proportion.

Conventionally, the presence of an object whose seal flange is warped or turned as shown in FIGS. 3 and 4 is a common occurrence, and the inspection for detecting a defective seal of this seal is performed by comparing applied voltages. Unless the height was set high and no danger was anticipated, a uniform inspection was virtually impossible. The present invention is a voltage application type pinhole inspection device, which can apply a voltage with an electrode while producing a flat surface while correcting a deformed portion of a seal flange, so that a low voltage can be applied without dropout and in a sufficiently safe area. There is an effect that allows.

This enables safe and efficient inspection of pinholes of pillar packaged products having deformed sealing flanges which are widely available on the market, which have been regarded as difficult due to many problems such as the risk of drilling. Things.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a state in which a subject is inspected by a pinhole inspection electrode sensor device of the present invention.

FIG. 2 is a plan view of the state explanatory view of FIG. 1;

FIG. 3 is an overhead view of a subject.

FIG. 4 is a side view of a subject.

FIG. 5 is an explanatory diagram of a dynamic state in which a deformed part of a subject is about to enter the correction gear of the present invention.

FIG. 6 is an explanatory view of a dynamic state when a voltage is applied by an electrode while correcting the deformed portion of the object to be flat with the correction gear of the present invention.

FIG. 7 is a dynamic explanatory view showing the same function as in FIG. 6 in the correction gear with a radial bar of the present invention.

FIG. 8 is an explanatory view of a dynamic state in which a subject is inspected by the correction gear and cylindrical electrode combination electrode sensor device of the present invention.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1, Subject 2, Transport conveyor 3, Transport conveyor 4, Feed roll 5, Feed roll 6, Forced feed roller 10 Correction gear 11 Swing support 12 Drive shaft 13 Drive V-wheel 14 Drive shaft 15 Drive V-wheel 16 V belt 17 Spring mechanism 18 Primary drive system 19 Motor 20 First electrode 21 Second electrode 22 Second electrode 23 Circuit 24 Circuit 25 Power supply 26 Detection control circuit 30 Correction gear 31 Bar 32 Conductive flexible material strand 33 Cylindrical electrode

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[Procedure amendment]

[Submission date] June 24, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Fig. 9

[Correction method] Added

[Correction contents]

FIG. 9 is a plan view showing a state where the cylindrical electrode of the present invention and a correction gear are combined.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] FIG.

[Correction method] Added

[Correction contents]

FIG. 10 is a sectional view of a cylindrical electrode obtained by combining the cylindrical electrode of the present invention and the radial bar correction gear of the second embodiment.

Claims (4)

[Claims] 1. A sealed packaging container subject (1) formed of a resin material and filled with contents therein, and a voltage is applied to the subject during transportation by a carrier (2, 3, 4, 5, 6). In a pinhole inspection device that detects and inspects a seal defect such as the presence or absence of a pinhole by the principle of applying an electric change and detecting the electrical change, a deformed part (1a, 1b) of the part of the object that is close to an irregular shape is front and back of the object. Means for correcting a plurality of pairs of correction gears (10a, 10b) with rocking support tools for simultaneously correcting the first and second electrodes, and a first electrode (20) and a second electrode for applying a voltage from the front and back of the subject. (21, 22) and detecting an electrical change in a circuit connecting the first electrode and the second electrode to a power supply (25) for supplying a voltage of a constant value to one of the first and second electrodes. A detection control circuit (26); and Wherein the subject Okunaka a pair symmetrical correction gear (1
An electrode sensor device for pinhole inspection, characterized in that the front and back sides are sandwiched at the same time by 0a and 10b), and a detection inspection of a seal failure such as the presence or absence of a pinhole can be simultaneously performed while correcting a deformed portion. 2. The correction gear with a pair of rocking supports (1).
0a, 10) Instead of a bar (3) having the same outer diameter as that of the gear and fixed to the outer periphery of the drive shaft (12) of the gear in a row of a dozen, equi-angular distribution.
2. The electrode sensor device for pinhole inspection according to claim 1, further comprising a plurality of symmetrical radial bar correcting gears (30a, 30b) constituted by (1). 3. The correction gear with swing support (10a,
10b and 30a, 30b), and an infinite number of conductive flexible material wires (32) having a small diameter in a radial spiral around the same shaft (12). It is configured so as to be fixed and extend over the entire width of the conveying surface with an outer diameter larger than the gear by an allowance for deflection, and a voltage is simultaneously applied to the front and back of the subject instead of the first electrode (20). 3. The pinhole inspection electrode sensor device according to claim 1, further comprising a pair of cylindrical electrodes (33) functioning as a first electrode. 4. A cylinder in which a radial linear element wire of the same diameter, the same width and the same material as the cylindrical electrode is densely fixed in place of the radial spiral element wire (32) constituting the cylindrical electrode (33). 4. The electrode sensor device for pinhole inspection according to claim 1, further comprising an electrode.