JPH0334695Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for inspecting the surface of a tape having a unique shape, such as the male and female fabrics of a cloth fastener.

Conventionally, methods for inspecting the surface condition of tape-like products as described above include visual inspection or sampling inspection using product samples, but these methods do not allow continuous measurement and also take a long time to measure. There are drawbacks such as the need to cut out samples from the product, and furthermore, there are complications such as cutting out samples from the product.

To further explain this point using a hook-type cloth fastener as an example, a hook-type cloth fastener is composed of two types of tape-like materials, one of which has a large number of hook-like protrusions. (hereinafter referred to as the A tape), and the other side has a large number of loop-shaped protrusions (hereinafter referred to as the B tape). By lightly pressing these two together, they intertwine with each other and generate adhesive force. The hook-like protrusions on A-tape are made by cutting a part of the pile of the pile fabric, but if the cut is in poor condition or there are uncut parts,
Adhesive strength decreases, resulting in defective products. Therefore, inspection of the cut state has become one of the important inspections of the fabric fastener. However, conventionally, this inspection of the cut condition has been carried out by visual inspection, or by taking samples from tape A and tape B, gluing them together, pulling them apart in two directions, and measuring the change in tension at this time. However, these methods have problems such as not being able to perform continuous measurements and requiring a lot of time for measurements.

The present invention aims to solve the above-mentioned drawbacks and provide a device that can easily and continuously measure the surface of a tape to be inspected. a transfer mechanism that continuously transfers the male cloth at a constant speed; a pair of pressure contact mechanisms that press the male cloth while running; a detector that detects sound or vibration; and a process that processes continuous signals obtained from the detector. It consists of four parts of electric circuit, and
The pressure contact mechanism includes a rotating roller around which a female cloth of a cloth fastener is wrapped, which is provided with a loop-shaped locked portion of a predetermined quality corresponding to a locking portion of the male cloth, and a roller that supports the male cloth. The gist of the present invention is to detect abnormalities on the surface of the male and female cloths based on the waveform of the peeling noise of the male and female cloths. The present invention will be explained in more detail below with reference to embodiments shown in the drawings. In this embodiment, the tape to be inspected is a male cloth of a cloth fastener having a hook-like or bulge-like locking portion on its surface, that is, the above-mentioned A tape, and sound is used as a signal.

In Figure 1, 1 is the aforementioned A tape, 2 is B
Show tape. As is well known, the surface of the A tape 1 is formed with a hook-shaped or bulge-shaped locking portion, and the surface of the B tape 2 is formed with a loop-shaped locked portion corresponding to the locking portion. It is provided.

The apparatus of the embodiment shown in FIG.
is the tape to be inspected, and in the same figure,
Reference numerals 3 and 3 indicate supply rollers consisting of a pair of left and right rotating rollers, 4 and 4 indicate take-up rollers that similarly consist of a pair of left and right rotating rollers, and 6 indicates a support roller that supports the A tape 1. The A tape 1 that is continuously fed out runs at a constant speed as indicated by the arrow in the figure, and is loaded with a predetermined tension by take-up rollers 4, 4 which rotate faster than the supply rollers 3, 3. 5
1 shows a pressure roller that comes into contact with the above-mentioned support roller 6, and is set to apply pressure to the support roller 6 by its own weight and apply a constant clamping pressure to the A tape 1. A standard B tape 2, which has been certified as having a predetermined quality by visual inspection and other tests, is wound around the circumferential surface, which is the working surface of the pressure roller 5.

In the apparatus shown in FIG. 2, the A tape 1 is running along the support roller 6, is adhered to the B tape 2 by the pressure roller 5, and is immediately peeled off.
At this time, a peeling sound is generated. This peeling sound is detected by a microphone 7, which is a detector, and converted into a voltage signal.

The voltage signal from the microphone 7 is passed through a filter circuit 8, a waveform shaping/feature extraction circuit 9, and an A/
It is taken into the microcomputer 11 via the D converter 10,
Here, the sound pressure level, power, etc. are calculated, and by comparing them with reference values, the adhesion state of A tape 1 and B tape 2 is sensed while A tape 1 is running continuously, and the surface condition of A tape 1 is detected. It is possible to judge the quality of the product.

At the position determined to be a defective part, the running of the A tape 1 is stopped, and the defective part is removed after inspection by marking or automatically marking that part. Work can be done easily. In addition, the distribution of adhesive strength of tape A 1 obtained by statistically processing the peeling sound can be used for quality control of each product lot.

Next, a specific example in which the above-mentioned A tape 1 was inspected using the apparatus shown in FIG. 2 will be described.

Specific example Consisting of A tape 1, which is a plain weave fabric of nylon thread with a hook part of 410 denier and a base fabric part of 70 denier, and B tape 2, which is a tricot knit fabric of nylon thread with a loop part of 210 denier and a base fabric part of 30 denier. For a cloth fastener with a width of 25 mm, wrap a B tape 2 of a predetermined grade around the pressure roller 5, and
The surface of tape A 1 was inspected while running tape 1 at 12 m/min.

The peel strength in the longitudinal direction of a good product is
3.2Kg for a 25mm width x 25mm length sample,
Moreover, the peeling sound waveform of a good product appears in the form shown in FIG. The peeling sound waveform of the portion determined to be defective by the apparatus shown in FIG. 2 has the shape shown in FIG. 5, and the portion 13 corresponds to the defective portion. Furthermore, the peel strength of this part was actually measured to be 2.3 kg.

As described above, the present invention allows the object to be inspected to run under a tension condition suitable for the object to be inspected, and presses, peels, or rubs the contact body against the surface of the object to be inspected while the object is running, and the noise generated at this time is By detecting changes in the detected signal using generally known waveform analysis or frequency analysis techniques, and applying statistical processing to the obtained data, the surface condition of the object to be inspected can be continuously and It enables inspection in real time, the work involved in inspection is very simple, the time required for inspection can be greatly shortened, and the drawbacks of the conventional method mentioned at the beginning can be completely eliminated. be.

It should be noted that, instead of sound, a similar test can be performed by detecting vibrations of the contacting body/test object or stress applied to the contacting body and processing the signals.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the tape to be inspected, Fig. 2 is an explanatory diagram of the example device, Fig. 3 is a flow diagram of the signal processing circuit, and Figs. 4 and 5 are signal waveform diagrams obtained with this device. be. 1...A tape, 2...B tape, 3, 3...
Supply roller, 4, 4... Take-up roller, 5...
...Crimping roller, 6... Support roller, 7... Microphone, 8... Filter circuit, 9... Waveform shaping/
Feature extraction circuit, 10... A/D converter, 11...
Microcomputer, 13...Flaw part.

Claims (1)

[Scope of utility model registration request] A transfer mechanism that continuously and at a constant speed transfers a male cloth of a cloth fastener having a hook-like or bulge-like locking portion on the surface, a pair of press-contact mechanisms that press the male cloth while running, and a pair of press-contact mechanisms that suppress noise or vibration. The press-contact mechanism is composed of four parts: a detector for detection, and an electric circuit for processing continuous signals obtained from the detector. It is comprised of a rotating roller around which a female fabric of a fabric fastener is wrapped, and a roller supporting the male fabric, and is characterized in that abnormalities on the surface of the male fabric are detected by the waveform of the peeling sound of the male and female fabrics. Tape surface inspection equipment.