KR970075092A

KR970075092A - Method and apparatus for detecting magnetic material in nonmagnetic products

Info

Publication number: KR970075092A
Application number: KR1019970017806A
Authority: KR
Inventors: 히로미츠 호리타; 고이치 가와카미; 노리아키 가자마; 츠네오 스즈키; 신이치 고지마
Original assignee: 요시다 다다히로; 와이 케이 케이 가부시키가이샤
Priority date: 1996-05-10
Filing date: 1997-05-09
Publication date: 1997-12-10
Also published as: KR100221032B1

Abstract

본 발명은 비자성 제품에 부주의하게 혼입된 자성체(10)를 검출하기 위한 방법 및 장치에 관한 것이다. 봉제품과 같은 비자성 제품(1)은 고자장(2)을 통과하게 되며, 제품에는 자장이 인가된다. 제품(1)에 혼입된 부러진 바늘과 같은 자성체(10)의 잔류 자화는 검출부(3)에 의해 검출되며, 검출신호는 검출부(4)로 전송되어 검출된 잔류 자화의 크기를 측정한다. 제품(1)내에서의 자성체(10)의 존재유무는 측정부(4)로부터의 출력에 기초하여 제어부(5)에 의해 결정된다. 선택적으로, 비자성 제품(1a)에 혼입될 가능성을 갖는 자성체에 미리 자장이 인가되므로써, 자성체(10a)를 잔류 자화 상태로 할 수도 있다.The present invention relates to a method and apparatus for detecting a magnetic body (10) inadvertently incorporated into a nonmagnetic product. A nonmagnetic product 1, such as a sewing product, passes through a high magnetic field 2, and a magnetic field is applied to the product. The residual magnetization of the magnetic body 10, such as a broken needle incorporated in the product 1, is detected by the detector 3, and the detection signal is transmitted to the detector 4 to measure the magnitude of the detected residual magnetization. The presence or absence of the magnetic substance 10 in the product 1 is determined by the control part 5 based on the output from the measuring part 4. Alternatively, the magnetic body 10a can be brought into a residual magnetization state by applying a magnetic field in advance to a magnetic body that is likely to be incorporated into the nonmagnetic product 1a.

Description

Method and apparatus for detecting magnetic material in nonmagnetic products

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 강자성체의 히스테리시스 곡선을 도시한 그래프, 제2도는 본 발명의 검출장치의 일실시예를 도시한 개략적인 구성도,제3도는 제2도에 도시된 장치에서 자기 센서의 레이아웃의 일실시예를 도시한 개략적인 평면도, 제4도는 본 발명의 검출장치의 다른 실시예를 도시한 개략적인 구성도, 제5도는 파손된 바늘의 잔류자화 측정에 있어서, 파손된 바늘의 이동방향과 자기 센서의 위치 사이의 관계를 도시한 모델 다이아그램, 제6도는 테스트 1에서 관찰된 자기 센서(홀 요소)의 출력과 파손된 바늘에 인가된 자장의 세기 사이의 관계를 도시한 그래프, 제7도는 테스트 1에서 관찰된 자기 센서(홀 요소)의 출력과 그 이동방향의 중심점으로부터 파손된 바늘의 거리 사이의 관계를 도시한 그래프, 제8도는 테스트 2에서 관찰된 자기 센서(미니트 코일)의 출력과 파손된 바늘에 인가된 자장의 세기 사이의 관계를 도시한 그래프, 제9도는 테스트 2에서 관찰된 자기 센서(미니트 코일)의 출력과 그 이동방향의 중심점으로부터 파손된 바늘의 거리 사이의 관계를 도시한 그래프.1 is a graph showing a hysteresis curve of a ferromagnetic material, FIG. 2 is a schematic configuration diagram showing an embodiment of the detection apparatus of the present invention, and FIG. 3 is an implementation of the layout of a magnetic sensor in the apparatus shown in FIG. Figure 4 is a schematic plan view showing an example, Figure 4 is a schematic configuration diagram showing another embodiment of the detection apparatus of the present invention, Figure 5 is a magnetization sensor and the direction of movement of the broken needle in the measurement of the residual magnetization of the broken needle A model diagram showing the relationship between the positions of, FIG. 6 is a graph showing the relationship between the output of the magnetic sensor (hall element) observed in Test 1 and the intensity of the magnetic field applied to the broken needle, and FIG. Graph showing the relationship between the output of the magnetic sensor (hall element) observed in 1 and the distance of the broken needle from the center point of its movement direction, FIG. 8 shows the output of the magnetic sensor (miniature coil) observed in test 2 Graph showing the relationship between the force and the strength of the magnetic field applied to the broken needle, FIG. 9 shows the distance between the output of the magnetic sensor (miniature coil) observed in test 2 and the distance of the broken needle from the center point of its movement direction. Graph showing the relationship.

Claims

A method of detecting a mixed magnetic material of a nonmagnetic product, the method comprising: applying a magnetic field to a nonmagnetic product, detecting residual magnetization of the magnetic material incorporated into the nonmagnetic product, and detecting the residual magnetization based on the detected residual magnetization. Magnetic material detection method comprising the step of determining the presence or absence of the magnetic material in the non-magnetic product.

A method for detecting a mixed magnetic material of a nonmagnetic product, comprising: assuming that the magnetic material contains residual magnetization by applying a magnetic field to a magnetic material that is likely to be incorporated into the nonmagnetic product, and Detecting residual magnetization of the incorporated magnetic material, and determining the presence or absence of the magnetic material in the nonmagnetic product based on the detected residual magnetization.

The magnetic body detection method according to claim 1 or 2, wherein the intensity of the magnetic field applied to the product is equal to or greater than a level for imparting saturated magnetization.

3. The method of claim 1 or 2, wherein the residual magnetization of the magnetic material is spaced at a fixed size in a direction perpendicular to the direction of movement of the non-magnetic product, while being disposed across the distance set in the moving product when the magnetic material is in motion. Magnetic body detection method characterized in that detected during the movement of the non-magnetic product by a plurality of magnetic sensors arranged.

The magnetic body detection method according to claim 1 or 2, wherein the non-magnetic product is a sewing product or a woven or knitted product.

The magnetic body detection method according to claim 2, wherein the nonmagnetic product is a sewing product, the magnetic body is a magnetized needle, and the residual magnetization of the needle incorporated in the sewing product is immediately detected after the sewing process.

An apparatus for detecting a magnetic substance in a product incorporated into a nonmagnetic product, the apparatus comprising: means for transferring the nonmagnetic product, detecting means for detecting residual magnetization of the magnetic substance contained in the nonmagnetic product in close contact with the moving means; And means for determining the presence or absence of a magnetic substance in the nonmagnetic product based on the information from the detecting means.

8. The magnetic body detection device according to claim 7, further comprising magnetic field generating means disposed upstream of said detection means for imparting a magnetic field to said product.

The magnetic body detection device according to claim 7 or 8, further comprising measuring means for measuring the intensity of residual magnetization of the magnetic body detected by said detection means.

The magnetic body detection device according to claim 7 or 8, wherein the detection means includes a plurality of magnetic sensors spaced apart by a distance set in a direction perpendicular to the moving direction of the product.

11. The magnetic body detection device according to claim 10, wherein said magnetic sensor is set from a group consisting of a hall effect, a magnetoresistive element, a magnetic impedance effect element, and a coil.

10. The magnetic body detection device according to claim 9, wherein the measuring means for measuring the intensity of the residual magnetization is associated with a noise removing circuit and a frequency setting and amplifying circuit.

※ Note: The disclosure is based on the initial application.