JPS592048Y2 - Cutting machine tape break detection device - Google Patents

Description

[Detailed Description of the Invention] The present invention is a cutting machine (hereinafter referred to as a slitter) that cuts a wide and long web roll into a desired narrow width while continuously unwinding it.

), and particularly relates to a device that automatically and quickly detects cutting of a tape body during or immediately after cutting into a desired narrow width.

The web referred to in this invention usually has a thickness of 5μ to 5mm,
Relatively long flexible plastic films with a width of 10 cm to 3 m, such as polyvinyl chloride, polycarbonate, acrylonitrile styrene copolymer, ABS resin, polyester, glass fiber-containing polyester resin, cellulose derivative, and paper. , sheets of synthetic paper, etc., and thin metal plates of aluminum, copper, etc. During the manufacturing process, these webs are once wound onto rolls, and then unwound during the processing steps. It is cut to a desired width and length depending on the application, and relatively long pieces are generally called tapes or single tapes.

In a conventional slitter, when the tape is cut due to insufficient mechanical strength of the tape or excessive tape tension as the web is narrowed from tape to tape, the work This system has the drawback that the above-mentioned tape breakage is detected by the operator late, and it takes time to completely stop the machine, which increases the number of product failures caused by the tape breakage.

The delay in detecting the tape break described above is due to the static electricity between the tape and the cutting blade, which generally form a pair of upper and lower rotating blades, causing the tape to become entangled with the rotating blade in multiple layers, making it impossible to cut the entire web. Ta.

Furthermore, since the monitoring of tape breakage relies on visual judgment by the operator, as the worker becomes more fatigued, the accuracy of the judgment decreases, and the cutting speed also needs to be reduced.

Furthermore, the equipment layout around the rotary blade must be devised to facilitate visual judgment, and many constraints are imposed on the running path design of the web and tape.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a slitter equipped with a tape break detection device capable of eliminating the above-mentioned drawbacks of the conventional slitter and stopping the operation of the slitter substantially at the same time as a tape break occurs.

The object of the present invention is to include a means for detecting reflected light of the rotary blade from a light projecting part and a light receiving part which are arranged opposite to each other on the outer peripheral surface of the rotary blade, and a means for detecting reflected light of the rotary blade, which amplifies the output voltage of the light receiving part and adjusts it to a specified level. A processing circuit for comparing and detecting the difference in light reflectance of the rotary blade is provided, and the tape body is cut to block the optical path between the light emitting and light receiving parts or to prevent the tape body from cutting on the outer peripheral surface of the rotary blade. It is distantly related to the tape breakage detection device of a cutting machine, which is characterized by detecting changes in light reflectance instantaneously when the tape is wrapped.

Hereinafter, one embodiment of the device of the present invention will be described in detail based on the attached drawings.

FIG. 1 is a schematic side view of a slitter equipped with the device of the present invention.

The web W continuously unwound from the web roll WR is guided in its running by a guide roll 1.

The rewound web W eventually forms a plurality of upper blades SU each mounted on vertically parallel support shafts.

A plurality of tapes T are formed by cutting into a desired narrow width by a rotary blade consisting of ~m, a lower blade SD, and ~m.

The tape T is guided by a guide roller 1 to winding means disposed above and below, and is wound around a tape roller TR.

Note that below the lower blades SD, ~m, there is a light projecting part A and a light receiving part B.
A plurality of sets of reflected light detection means 2 of rotary blades are arranged in the width direction of the web W.

The number (1-n) of the reflected light detection means 2 is
and the number of pairs of lower blades SD (1-m).

When the reflected light detection means 2 is operated to constantly detect the reflected light from the outer circumferential surface of the lower blade SD, the tape T around the rotary blade is cut and the optical path between the light emitting and light receiving parts (indicated by the broken line) is cut. If it hangs down so as to block the light (as shown) or wraps around the lower blade SD, the output signals of the light receiving sections B1 to Bn will fluctuate.

Fluctuations in the light reflectance of the outputs of the light receiving sections B1 to Bn are detected by the processing circuit 3 shown in FIG. 3.

The processing circuit 3 includes the same number of amplifiers P1 as each of the light receiving sections B1 to Bn.
~n and comparators C1~n.

The output signals of the respective light receiving sections B, ~n are transmitted to the amplifiers P, ~n.
and its output voltage is amplified by the comparators C1~n
The presence or absence of cutting of the tape T is detected between the respective comparison levels L1 to Ln.

(Fig. 2) The amplifiers P1 to n below the comparison levels L1 to n
When the output voltage (x mark) is input to the comparators C1-n, the output of the comparator CI-n is turned ON and the alarm drive section 4 is activated to issue an alarm or immediately stop the slitter. let

The amplifiers P1-n are at or above the comparison level 1-n.
When the output voltage (marked with a circle) is input to the comparators C1 to Cn, the outputs of the comparators C1 to Cn are turned OFF, and the cutting operation continues.

Incidentally, depending on the form and selection of the projector, the light receivers A and B, and the lower blade SD, the output of the light receiver B is kept at a substantially constant comparison level L.

If the processing circuit 3 can be divided into two groups (FIG. 4), the configuration of the processing circuit 3 may be made into one series after the amplifier as shown in FIG. 5, and the emitter A or receiver B may be sequentially scanned from 1 to can.

By using a long tube such as a fluorescent lamp as the light projecting part A, and by using a long tube such as a solar cell as the light receiving part B, each can be reduced to one piece.

It is also possible to adopt a flying spot scanning method by using a rotating polygon mirror in the projection and light receiving sections.

Furthermore, it is also possible to detect not only the lower blade SD but also the upper blade or both of the upper blades at the same time.

The device of the present invention described below has the following novel effects.

1. The light reflected from the rotary blade is always detected by the detection means 2, and the processing circuit instantly detects changes in the light reflectance, so there is no need for personnel to monitor when the tape breaks, and the cutting speed can be reduced. It is now possible to increase work efficiency by increasing the size to a large size.

2. Since the detecting means 2 can be configured extremely compactly, there is no need to pay special design considerations, and it has become possible to design the device most suitable for cutting operations.

3. Since the outer peripheral surface of the rotary blade is constantly monitored by the detection means 2, it is possible to reliably detect dirt on the rotary blade, adhesion of foreign matter, generation of tape powder due to deterioration of cutting quality, etc. Maintenance and inspection of the blade has become extremely easy, and the lifespan of the blade can therefore be extended.

[Brief explanation of drawings]

Fig. 1 is a side view of a slitter equipped with the device of the present invention, Figs. 2 and 4 are graphs showing detection signals input to the processing circuit of the device of the present invention, and Figs. FIG. 2 is a block diagram showing a processing circuit of the invention device. W is the web, WR is the web roll, T is the tape, TR is the tape roll, 1 is the guide roll, 2 is the detection means, 3 is the processing circuit, A is the light projector, B is the light receiver, P is the amplifier, and C is the It is a radiator.

Claims (1)

[Scope of utility model registration request] Cutting a relatively long and wide web roll wound into a coil into a desired narrow width using a pair of upper and lower rotating blades while continuously unwinding the web to obtain a plurality of tape bodies. In the machine, the rotating blade includes a light emitting section disposed opposite to the outer circumferential surface of the rotary blade, and a reflected light detection means of the rotary blade which is emitted from the light receiving section, and an output voltage of the light receiving section is amplified, and the output voltage of the rotating blade is compared with a specified level. The tape body is equipped with a processing circuit that detects the difference in light reflectance of the blades, and when the tape body is cut and blocks the optical path between the light emitting and light receiving parts, or when wrapped around the rotary blade, light is reflected instantaneously. A tape break detection device for a cutting machine, which is characterized by detecting rate fluctuations.