JPH10121369A - Detecting member for detector of iron piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detection member of a detector for ion pieces, having widened detection area of iron piece without causing deformation and change in a search coil by magnetic disturbance or vibration which occurs in the circumference. SOLUTION: In this detector of iron piece constituted so as to detect existence of iron piece in a sewn product carried by a belt conveyer in a detection part comprising a permanent magnet and a detection member, the detection member 1 used for detection part arranges a detection tool 4 obtained by winding a search coil 3 around a small-sized iron core 2 obliquely to passing direction of the sewn product and arranges plural detection tools 4 in lateral direction and as a whole, installs these detecting tools 4 in a state perpendicular to passing direction of the sewn product and output of the search coil 3 of each detecting tool 4 is connected to an electronic circuit 5 so as to erase to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection member of an iron piece detector for detecting iron pieces such as needles and pins mixed in sewing products, and an iron piece detector.

[0002]

2. Description of the Related Art Various sewing products such as clothes, kimonos, futons and the like use sewing needles, hand sewing needles, waiting pins, dress pins (insect pins), etc. for sewing. In some cases, the iron piece with a sharp point such as a forgot may be forgotten to be removed, or a broken needle may be inserted. Wearing clothes with needles and pins or sleeping on a futon is extremely dangerous because the needles and pins may stick into the body.

Conventionally, a sewing maker inspects a finished sewn product before shipment for iron pieces such as needles and pins or admixes with the inside of the sewn product. Iron pieces were removed from the product. An iron piece detector using a magnetic induction method is used for detecting iron pieces such as needles and pins, and this is abbreviated as a needle detector (instrument).

A magnetic induction system for detecting an iron piece utilizes a static magnetic field generated by a permanent magnet, and passes through a magnetic field formed by lines of magnetic force and strongly reacts with an iron piece having a property of being attracted to a magnet. The presence or absence of an iron piece is detected by an iron core, the induced electromotive force obtained by a search coil is amplified to a certain level, taken out as a signal, and the presence of an iron piece such as a needle or a pin is confirmed.

The iron piece detectors described above include a handy type (needle detector) and a large tunnel type (needle detector). FIG. 3 shows an example of a conventional tunnel-type iron piece detector, which can be roughly divided into a detection section A and a detection display section B. The detection section A is a section for detecting the presence or absence of an iron piece, and forms the center of the detector.
Sewing products such as clothes and kimono are continuously sent in one direction on the circulating belt conveyor C, pass through the detection unit A, and when it is detected that iron pieces are mixed, the display unit B is displayed. Warning by flashing lamp or buzzer sound.
The display section B also serves as an operation section for driving the entire detector.

FIG. 4 schematically shows a detection section A used in the above-mentioned tunnel type iron piece detector, which comprises a long permanent magnet a and a pair of long detection members b. The magnet a and the detection member b are installed vertically facing each other with the belt conveyor C interposed therebetween. Accordingly, the sewn product passes on the belt conveyor C and passes between the magnet a and the detection member b in the arrow X direction.

The detecting member b has a structure in which a copper search coil d that can be energized is wound around an elongated iron core c.
The two detection members b form a detection circuit by connecting the (+) pole and the (-) pole to the electronic circuit e in the detection display section B so that the signal outputs of the search coil d cancel each other. ing.

A magnetic flux space is formed by the magnetic lines of force generated between the N pole and the S pole of the magnet a. When a needle, a pin or the like passes through the magnetic flux space, the magnetic lines of force change, and the iron core c detects this. From the search coil d as a signal. Therefore, when the sewn product passes through the magnetic field formed by the lines of magnetic force and the iron pieces are mixed, this is detected, and the display unit B notifies the sewn product.

[0009]

However, the detecting member b
Since the search coil d is wound around the long iron core c, the magnetic disturbance generated by using a tool or rotating the motor around the detector causes (+) of the electronic circuit e.
There is no problem because the side signal and the (-) signal are combined and canceled. However, although the search coils d of the two detection members b are connected so that the outputs cancel each other, when vibration is directly applied to the detector itself, a deformation dynamic such as distortion or bending occurs in the search coil d. Therefore, the output signals from the pair of detecting members b are different from each other, and the mutual canceling action does not occur. For this reason, the lamp blinks or a buzzer sounds as if the iron core was detected, even though the iron core was not detected.

For example, as shown in FIG. 5, when vibration (Y) is applied to the iron piece detector in the same direction as the transport direction X of the sewn product, as shown in FIG.
b2 is inclined to one side. Accordingly, the (+) potential of the coil of the detection member b1 has a (+) potential, the (-) pole has a (-) potential, and the (+) pole of the coil of the detection member b2 has a (-) potential. However, since the (+) potential is output to the (-) pole, the noise increases without canceling each other.
FIGS. 5 and 6 show cases in which the sewn product is inclined in the passing direction, but the same applies to the reverse case.

The detection member b is formed by winding the search coil d around the elongated iron core c as described above. The vibration of the driving motor for circulating the belt conveyor C and the vibration of the belt conveyor C, etc. Is transmitted to the detection unit A in a complex manner, which has a vibration effect on the search coil d which is simply wound around the iron core c, and this causes the noise signal to obscure a valid signal input, thereby causing a detection failure. .

In view of the above-mentioned various problems of the conventional tunnel-type iron piece detector, the present invention has a structure in which a small detector is arranged obliquely to a passing direction of a sewing product, and a plurality of detectors are provided. By arranging in the horizontal direction perpendicular to the passing direction of the sewing product, the deformation dynamics may be generated in the search coil not only by the magnetic disturbance generated at the periphery but also by the vibration directly applied to the detector An object of the present invention is to provide a detection member of an iron piece detector in which an output signal is accurately read, and an iron piece detection area is widened.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an iron piece detecting device for detecting the presence or absence of an iron piece in a detecting section comprising a permanent magnet and a detecting member for a sewing product conveyed by a belt conveyor. In the detector, a detecting member 1 used for a detecting section is composed of a small iron core 2 and a search coil 3.
Are arranged obliquely with respect to the passing direction of the sewn product, and a plurality of detectors 4 are arranged side by side in a direction orthogonal to the passing direction of the sewn product. The outputs of the search coil 3 are connected to the electronic circuit 5 so as to cancel each other.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of a detection member according to the present invention used for a detection unit of an iron piece detector. This detection member 1 is a single body obtained by winding a search coil 3 around a small iron core 2 by a necessary number. Are arranged obliquely with respect to the passing direction (arrow X) of the sewing product, and a plurality of the detecting tools 4 are arranged in the horizontal direction, and the detecting member 1 as a whole is orthogonal to the passing direction of the sewing product. It is arranged in a state.

The cores 2 of the adjacent detectors 4 are located at positions where the ends 2a and 2b overlap each other along the passing direction X of the sewn product, so that no gap is formed between the adjacent cores 2 and The output of the search coil 3 of the adjacent detector 4 is detected in such a manner that the (+) and (-) poles cancel each other as in the case of the search coil of the detection member used in the conventional iron detector. It is connected to the electronic circuit 5 in the detection display unit installed in the vessel.

As described above, the detection member 1 described above is installed facing the permanent magnet in the detection section of the iron piece detector, and passes the sewn product between the permanent magnet and the detection member 1 using a belt conveyor. M pole of permanent magnet and S
When an iron piece such as a needle or a pin is mixed in a sewing product in a magnetic flux space formed between the poles, the iron core 2 detects this and outputs it as a signal from the search coil 3. The iron core 2 has a length of 7 cm to 15 cm and a plate width of 1 cm.
The size within the range of cm to 3 cm and the height of 2 cm to 5 cm is optimal. A required number of search coils 3 are wound around the iron core 2.

As described above, the plurality of detectors 4 are arranged obliquely with respect to the passing direction of the sewn product, and the cores 3 of the adjacent detectors 4 are located such that their ends overlap each other. Since the outputs of the adjacent search coils 3 are connected to the electronic circuit 5 so as to cancel each other out, when the iron piece mixed into the sewn product passes, the detection output is the detection tool 4 closest to the iron piece. Will be output.

Since the iron core 2 is obliquely inclined with respect to the passing direction of the sewn product, the sewn product is oblique even when the width of the iron core 2 is the same as the iron core used in the conventional detecting member. Pass over the iron core 2. Therefore, the passage area on the iron core 2 is increased, and the detection sensitivity of the iron piece is improved.

In addition, with respect to the magnetic disturbance around the iron piece detector, the signal outputs of the adjacent search coils 3 cancel each other out. Further, even when the detector itself is vibrated by an external factor, each of the detectors is not affected. Since the size of the search coil 4 is small, the search coil 3 does not generate deformation dynamics, and the search coils 3 of the adjacent detectors 4 cancel each other out, so that a normal signal required for detection is obstructed. Never do.

For example, as shown in FIG. 2, even when the single detector 4 is inclined by the vibration applied to the iron piece detector along the passing direction of the sewing product, the same coil faces upward. To move the iron core 3
One side is a (+) pole and the other side is a (-) pole with respect to the center of the boundary, and the polarity of generation of the potential is opposite depending on the location of the coil. Therefore, the components that cancel each other out in the coil and are output as noise are extremely weak. If the plurality of detectors 4 are arranged and fixed on a metal plate, a synthetic resin plate, or the like, for example, when installed in the detector, handling is easy and the alignment state can be stabilized.

[0021]

The detection member 1 of the present invention described above reduces the size of the detection tool 4 in which the search coil 3 is wound around the iron core 2 and makes the plurality of detection tools 4 oblique to the passing direction of the sewing product. So that it is arranged in the transverse direction to the passing direction of the sewing product so that the ends of the adjacent iron cores 3 overlap with each other.
The search coil 3 of each detector 4 does not generate deformation dynamics such as distortion or bending due to the vibration applied to the iron piece detector, and the search coils 3 are electrically connected so as to cancel each other. Therefore, a malfunction does not occur due to peripheral disturbance or vibration.

Moreover, since the detectors 4 are arranged obliquely with respect to the direction in which the sewn product passes, the facing area between the sewn product passing over the detectors 4 and the iron core 2 increases, and the detection signal The receiving ability is enhanced, and the detection sensitivity of iron pieces mixed in the sewn product can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a detection member according to the present invention.

FIG. 2 is a side view of a state in which a vibration is applied to the detector and the detector is inclined.

FIG. 3 is a perspective view showing an example of a conventional tunnel type iron piece detector.

FIG. 4 is a perspective view of a detection unit used in a conventional iron piece detector.

FIG. 5 is a side view of a conventional iron piece detector in a state where vibration is applied to a detection unit.

FIG. 6 is a side view showing a state in which a detection member of a detection unit in a conventional iron piece detector is inclined by being subjected to vibration.

[Description of Signs] 1 Detection member 2 Iron core 3 Search coil 4 Detector 5 Electronic circuit A Detection member B Detection display section C Belt conveyor a Permanent magnet b Detection member c Iron core d Search coil e Electronic circuit

Claims (1)

[Claims] An iron piece detector for detecting the presence or absence of an iron piece in a detection part comprising a permanent magnet and a detection member for a sewn product conveyed by a belt conveyor, wherein the detection member 1 used for the detection part is a small iron core. 2 to search coil 3
Are arranged obliquely with respect to the passing direction of the sewn product, and a plurality of the detecting tools 4 are arranged side by side in a state orthogonal to the passing direction of the sewn product as a whole, An output from the search coil 3 of each detector 4 is connected to the electronic circuit 5 so as to cancel each other.