KR20030031097A - Watch dog thread in a shuttle of sewing machine - Google Patents

Watch dog thread in a shuttle of sewing machine Download PDF

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Publication number
KR20030031097A
KR20030031097A KR1020030020289A KR20030020289A KR20030031097A KR 20030031097 A KR20030031097 A KR 20030031097A KR 1020030020289 A KR1020030020289 A KR 1020030020289A KR 20030020289 A KR20030020289 A KR 20030020289A KR 20030031097 A KR20030031097 A KR 20030031097A
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South Korea
Prior art keywords
bobbin
shaft
light
sewing machine
shuttle
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KR1020030020289A
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Korean (ko)
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KR100465132B1 (en
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윤경기
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윤경기
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Priority to KR10-2003-0020289A priority Critical patent/KR100465132B1/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
    • D05B59/02—Devices for determining or indicating the length of thread still on the bobbin
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
    • D05B57/10—Shuttles
    • D05B57/14—Shuttles with rotary hooks
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/28—Applications of bobbins for storing the lower thread
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8901—Optical details; Scanning details
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2305/00—Operations on the work before or after sewing
    • D05D2305/32—Measuring
    • D05D2305/36—Quality control

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

PURPOSE: On a sewing machine, a bottom-yarn detecting device is capable of signaling a replacement time of bottom-yarn, interrupting electric source of a motor, preventing badness of a sewing work, increasing durability and maximizing efficiency of the sewing work. CONSTITUTION: The bottom-yarn detecting device of the sewing machine is comprised of: a shuttle case(20) installed in a rotating hook; a transparent bobbin(30) and a shuttle(40) installed on a bottom-yarn feeding device; a light-emitting diode(LED) radiating light to the bottom-yarn feeding device; a photodetector(22) installed on a shaft of the shuttle case(20); an electrode(23) which is installed on an end of the shaft and is connected with the photodetector(22), delivering a signal outside; and a contact having elasticity which is installed on the rotating hook(10). On the shuttle(40), the shaft has a hole.

Description

재봉틀의 밑실 감시장치{WATCH DOG THREAD IN A SHUTTLE OF SEWING MACHINE}WATCH DOG THREAD IN A SHUTTLE OF SEWING MACHINE}

본 발명은 재봉틀의 밑실 감시장치에 관한 것이다.The present invention relates to a lower thread monitoring device of a sewing machine.

일반적으로 봉제품을 봉제하는데 사용되는 일반적인 재봉기는 한가지 불가피한 결함을 지니고 있다. 보빈에 감겨있는 북실의 양이 한계가 있기 때문에 박음질하는 동안 북실이 소진되어 헛바느질에 의한 원단의 불량을 초래함으로 빈번히 잔실의 여부를 점검할 수 없어 봉제능력이나 생산성이 떨어졌다.In general, a general sewing machine used to sew a sewing product has one inevitable defect. Due to the limited amount of bobbin thread wound on the bobbin, the bobbin thread is exhausted during the sewing and it causes a defect of the fabric due to the sewing.

이러한 문제점을 해결하도록 밑실교체 시기를 알려 효율적인 봉제작업을 하도록 한 종래 기술들이 이미 많이 알려져 있다.In order to solve this problem, a lot of prior arts have already been known for efficient sewing work by notifying when the lower thread is replaced.

보빈의 실의 유무를 알기위하여 광전공학적으로 만들어진 감지기중 국제공개번호 W088/07099에서 보인 것과 같이 실자체의 반사광을 이용한 감지기는 실의 유동성과 굵기 등에 많은 오동작을 발생함으로 일반적인 다용도 재봉틀에 적용하기가 어려운 문제점이 있다.As shown in International Publication No. W088 / 07099 among the photoelectrically engineered sensors to know the existence of bobbin thread, the sensor using the reflected light of the thread itself causes a lot of malfunctions in the fluidity and thickness of the thread, making it difficult to apply to general-purpose sewing machines. There is a difficult problem.

또한, 특허 공개번호 96-34515의 잔사식별을 보빈의 회전수로서 감지할 경우 부분적으로 한정된 연속적이며 일괄작업용 재봉틀에는 사용가능하나 모든 재봉틀에 사용하기는 부적합한 문제점이 있다.In addition, when the residue identification of Patent Publication No. 96-34515 is detected as the number of revolutions of the bobbin, it is partially limited continuous and can be used for a sewing machine for batch work, but there is a problem that is not suitable for use in all sewing machines.

그리고, 특허 공개번호 특1999-0069253의 밑실공급장치의 모든 부속품에 빛의 관통로를 만들어서 발광LED로 부터 수광까지의 통로가 이론상의 통로와 일치할 수 없어 오동작의 요인이 많아 문제점이 있다.In addition, since all the accessories of the lower thread supply device of Patent Publication No. 1999-0069253 make a light passage, the path from the light emitting LED to the light reception cannot be matched with the theoretical path, and there are many problems of malfunction.

그리고, 실용신안 출원번호 20-2001-0030286(명칭 : 북실잔사 감지기가 있는 재봉틀)의 축이 없는 북은 재봉틀에 장착하여 동작시켰을 때 북이 흔들려 봉재시 바늘 파손 및 오동작의 요인이 많아 문제점이 있었다.In addition, the book without a shaft of the utility model application No. 20-2001-0030286 (name: sewing machine with a northern thread residue detector) had a problem that the needle shakes and malfunctions during sewing when the drum shakes when it is mounted and operated on the sewing machine. .

결론적으로 기 발표된 잔사식별은 한정적인 재봉틀에는 쓸수 있으나 보편성은 낮다고 생각되어 밑실 공급 장치를 개조하여 확실한 동작으로 생산성 향상에 기여하고자 합니다.In conclusion, the previously announced residue identification can be used for limited sewing machines, but the generality is considered to be low.

본 발명의 목적은 재봉틀 밑실의 잔사 여부를 광학적인 방법으로 감시하여 헛박음질에 따른 봉재작업의 불량을 사전 예방함은 물론, 내구성을 높여 봉제작업의 효율성을 극대화 하도록 한 재봉틀의 밑실 감시장치를 제공함에 있다.It is an object of the present invention to provide a bobbin monitoring device of the sewing machine to maximize the efficiency of the sewing operation to increase the durability, as well as to prevent the failure of the sewing operation due to the shedding by monitoring the residue of the sewing machine lower thread in an optical method. Is in.

이러한 본 발명의 목적을 달성하기 위한 본 발명은 회전가마의 내부에 북집이 설치되고, 그 북집에 밑실감이용 보빈과 북이 설치된 밑실공급장치에 빛을 조사하는 발광LED와 조사된 빛을 감지하는 수광센서(PHOTODETECTOR)가 설치되어 밑실에 잔사가 없으면 이를 알려주도록 된 재봉틀의 밑실 감시장치에 있어서, 상기 수광센서(PHOTODETECTOR)는 북집에 구비된 축에 설치함과 아울러 그 축의 끝단을 통해 외부로 신호가 전달되도록 상기 축의 끝단에 수광센서와 연결되는 전극을 설치하고, 그 전극과 접촉되는 접촉부(탄성이 있음)를 상기 회전가마에 설치하여 외부로 신호가 전달되도록 하는 한편, 상기 보빈은 투명의 재질로 구성하고 축에 구멍이 있는 북을 사용한 것을 특징으로 한다.The present invention for achieving the object of the present invention is installed in the inside of the rotary kiln, the bobbin and bobbin for the bobbin thread and the bobbin is installed on the bobbin supply device for irradiating light to detect the irradiated light In the lower thread monitoring device of the sewing machine to be notified that there is no residue in the lower thread because the photodetector (PHOTODETECTOR) is installed, the photodetector (PHOTODETECTOR) is installed on the shaft provided in the bobbin and signaled to the outside through the end of the shaft An electrode connected to the light receiving sensor is installed at the end of the shaft so that the light is transmitted, and a contact portion (elastic) contacting the electrode is installed on the rotary kiln to transmit a signal to the outside, while the bobbin is made of a transparent material. It is characterized by using a drum with a hole in the shaft.

위 회전가마의 접촉부 즉 수광센서의 전극과 접촉되는 접촉부는 봉재실이 지나갈 수 있도록 탄성을 갖고있는 것을 특징으로 한다.The contact part of the rotary kiln that is in contact with the electrode of the light receiving sensor is characterized in that it has elasticity so that the bar thread can pass.

도 1은 일반적인 밑실 공급장치의 구성 부속품 전개도1 is an exploded view of the configuration accessories of a conventional bobbin feeder

도 2는 본 발명에 의해 개발된 밑실 공급장치의 구성 부속품 전개도.Figure 2 is an exploded view of the components of the bobbin feeder developed by the present invention.

도 3a는 회전가마에 설치되는 연결부를 나타낸 도면.Figure 3a is a view showing a connection installed in the rotary kiln.

도 3b는 북집축에 수광센서가 설치된 상태를 나타낸 도면.Figure 3b is a view showing a state in which a light receiving sensor is installed on the north axis.

도 4는 본 발명에 의해 개발된 밑실공급 장치에 발광LED(60)를 사용하여 빛을 조사하여 수광센서(22)에 도달하기 까지의 배치를 보다 상세하게 설명하기 위한 밑실 공급 장치의 구성을 나타낸 도면이다.Figure 4 shows the configuration of the lower thread supply device for explaining in more detail the arrangement up to reach the light receiving sensor 22 by irradiating light using the light emitting LED 60 to the lower thread supply device developed by the present invention Drawing.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1 : 회전가마. 2 : 북집.1: rotary kiln. 2: north house.

3 : 밑실보빈. 4 : 북. 41 : 북의 축.3: bobbin bobbin. 4: north. 41: axis of the north.

10 : 내,외부에 전극이 있는 회전가마.11 : 회전가마의 내,외부 전극연결부.10: Rotary kiln with electrodes inside and outside. 11: Internal and external electrode connections of the rotary kiln.

12 : 외부전극 접촉부. 13 : 북집과의 접촉부(탄성이 있음)12: external electrode contact portion. 13: contact part with bobbin case (elasticity)

20 : 수광센서(22)가 있는 북집. 21 : 북집 축.20: north house with the light receiving sensor 22. 21: bobbin shaft.

22 : 수광센서(PHOTODETECTOR) 23 : 수광센서의 전극.22: PHOTODETECTOR 23: Electrode of light receiving sensor.

30 : 밑실감이용 투명보빈(투명재질 사용).30: Transparent bobbin for lower thread feeling (using transparent material).

40 : 축에 구멍이 있는 개발된 북(발광부의 빛을 수광센서로 통과함).40: A developed drum with a hole in the shaft (light passing through the light emitting part through the light receiving sensor).

50 : 밑실 잔사없음 구동회로(경광등, 부져, 모터 전원차단기 등을 구동).50: No lower thread residue drive circuit (driving beacon, buzzer, motor power circuit breaker, etc.).

51 : 센서제어회로 및 전극 접촉부.51: sensor control circuit and electrode contact.

60 : 발광제어회로 및 발광LED.60: light emission control circuit and light emitting LED.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시 예를 더욱 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

본 발명은 도 1 에 보인 것과 같이 광학적인 방법으로 감지하고자 하드라도 구조상으로 빛이 차단되는 북집(2)의 축(21)과, 밑실보빈(3) 및 북(4)의 축(41)등으로 3중의 장애가 발생하는데, 이러한 장애물들을 제거하여 북집(2)의 축(21)에 수광센서(22 : PHOTODETECTOR))를 장착하여 감지된 신호를 전극(23)으로 보내어 그 외부에 있는 개량된 회전가마(10)의 북집과의 접촉부(13 : 탄성이 있음)를 통하여 외부전극 접촉부(12)로 전달되어 외부에 있는 센서제어회로(51)로 전달되어 밑실없음 구동회로(50)로서 작업 여건에 맞는 경광등, 부저, 모터 전원 차단등 작업자의 주의를 환기시켜 밑실을 교체하게 하는 것이다.The present invention, as shown in Figure 1, even if hard to detect the optical structure as shown in Fig. 1, the shaft 21 of the bobbin (2), the bobbin bobbin (3) and the shaft (41) of the drum 4, etc. Three obstacles are generated, and these obstacles are removed, and a light receiving sensor 22 (PHOTODETECTOR) is mounted on the shaft 21 of the drum 2 to send a detected signal to the electrode 23, thereby improving rotation outside thereof. It is transmitted to the external electrode contact part 12 through the contact portion 13 (which has elasticity) with the bobbin of the kiln 10 and is transferred to the sensor control circuit 51 which is externally. The worker will be asked to replace the lower thread by calling the worker's attention, such as a warning light, a buzzer, or a power off.

본 발명을 도 2 와 도 3a 및 도 3b 에 의하여 상세히 기술하면, 항상 회전하고있는 회전가마(1)의 내측면에는 북집축에 있는 수광센서(22 : PHOTODETECTOR)의 전극(23)과 접촉되는 탄성이 있는 접촉부(13)를 만들고, 외부에 센서 제어 회로(51)에 연결되는 외부 접촉부 전극(12)이 있는 개량된 회전가마(10)이며, 개량된 북집(20)은 북집축(21) 내부에 기본적으로 수광센서(22 : PHOTODETECTOR)를 장착하여 개량된 회전가마(10)의 접촉부(13)와 연결될 전극(23)이 만들어진 개량된 북집(20)이다. 수광센서(22)는 빛이 없을때는 저항값이 최대가 되고 빛이 조사되면 저항값이 최소가 되어 밑실의 잔사여부를 감시하게된다.Referring to the present invention in detail with reference to Figs. 2, 3A and 3B, the inner surface of the rotary kiln 1, which is always rotating, is in contact with the electrode 23 of the light receiving sensor 22 on the North axis. Is an improved rotary kiln 10 having an external contact electrode 12 externally connected to the sensor control circuit 51, which is made of a contact 13, and the improved bobbin 20 is inside the north collector shaft 21. Basically it is an improved drum (20) is made of the electrode 23 to be connected to the contact portion 13 of the improved rotary kiln 10 by mounting a light receiving sensor (22: PHOTODETECTOR). When there is no light, the light receiving sensor 22 has a resistance value that is maximum, and when light is irradiated, the resistance value is minimized to monitor whether the lower thread is left.

또한, 상기 밑실이 감겨진 밑실보빈(3)은 투명의 재질로 구성하여 발광 LED(60)의 빛을 차단 하지 않게 만들어진 투명보빈(3)이다.In addition, the bobbin bobbin bobbin wound around the bobbin (3) is a transparent bobbin (3) made of a transparent material so as not to block the light of the light-emitting LED (60).

상기 북(4)은 빛을 차단하는 축(41)에 발광LED(60)의 빛을 수광센서(22 : PHOTODETECTOR)에 통과 할수있도록 구멍이 있는 개량된 북(40)이다.The book 4 is an improved book 40 having a hole to allow the light of the light emitting LED 60 to pass through the light receiving sensor 22 on the shaft 41 that blocks the light.

상기 각 부속들이 조립된 상태에서 투명보빈(30)에 밑실이 감겨있으면 수광센서(22 : PHOTODETECTOR))에는 발광회로(60)에서 나온 빛이 차단되어 수광센서(22)는 저항값이 높아져 동작하지 않고 밑실이 모두 소진되면 발광회로(60)에서 나온 빛이 투명보빈(30)과 구멍이 있는 개량된 북(40)을 통과하여 수광센서(22)에 조사되어 센서의 저항값이 급격하게 낮아진다. 이 낮아진 저항값 신호는 전극(23)을 통해 회전가마(10)의 내부 접촉부(13 : 탄성이 있음) 및 외부접촉부(12) 전극으로 전달되어 센서제어회로 및 접촉부 전극(51) 및 밑실 잔사없음 구동회로(50)의 순으로 전달되어 경광등, 부져, 모터 전원차단 등에 의해 작업자에게 밑실없음을 알려주어 밑실을 교체하게 한다.When the bobbin thread is wound around the transparent bobbin 30 in the state where each of the parts is assembled, the light from the light emitting circuit 60 is blocked in the light receiving sensor 22, so that the light receiving sensor 22 does not operate due to a high resistance value. When the lower thread is exhausted, the light emitted from the light emitting circuit 60 passes through the transparent bobbin 30 and the improved book 40 with holes, and is irradiated to the light receiving sensor 22 so that the resistance value of the sensor is drastically lowered. This lowered resistance value signal is transmitted to the inner contact portion 13 (elastic) and the outer contact portion 12 of the rotary kiln 10 through the electrode 23 so that there is no sensor control circuit and the contact electrode 51 and the lower thread residue. It is transmitted in the order of the driving circuit 50 to notify the operator of the lower thread by warning lights, buzzers, motor power cut, etc. to replace the lower thread.

즉 전체구조는 첫째 북집(2)의 축(21)에 수광센서(22 : PHOTODETECTOR))를 장치하여 전극을 만든 개량 북집(20)과 개량 북집(20)에서 발생한 신호(저항값 감소신호)를 전달받는 탄성이 있는 내부 접촉부(13)전극과 내,외부 전극 연결부(11), 외부전극 접촉부(12)전극이 형성된 개량 회전가마(10)와 외부 발광회로, 발광LED(60)에서 조사된 빛의 차단을 제거한 밑실감이용 투명보빈(30)과 북(4)의 축(41)에 구멍을 뚫은 개량된 북(40)으로 구성된 밑실 공급 장치와,In other words, the overall structure is a signal (resistance value reduction signal) generated from the improved north house 20 and the improved north house 20 in which the electrodes are formed by attaching a light receiving sensor 22 to the shaft 21 of the first north house 2. Light irradiated from the improved rotary kiln 10 and the external light emitting circuit and the light emitting LED 60, in which the elastic inner receiving electrode 13, the inner and outer electrode connecting parts 11, and the outer electrode contacting parts 12 are formed to receive elasticity. Lower bobbin supply device consisting of a lower bobbin transparent bobbin 30 and the improved drum 40 punched in the shaft 41 of the drum 4,

둘째 도4 에서 보인바와 같이 밑실 공급 장치 외부에서 빛을 조사하기 위한 발광회로 및 발광 LED(60)과 밑실 공급장치 내부의 수광센서(22)에서 나온 신호를 분석 하기 위한 센서 제어회로 및 접촉부 전극(51)과 밑실 잔사없음 구동회로(50)로 구성되어진다.Second, as shown in FIG. 4, a light emitting circuit for irradiating light from the outside of the lower thread supply device and a sensor control circuit and a contact electrode for analyzing signals from the light emitting LED 60 and the light receiving sensor 22 inside the lower thread supply device ( 51) and a drive circuit 50 without a lower thread residue.

이상 설명에서 알 수 있는 바와 같이 본 발명은 봉제시 밑실의 최소 한계점에 도달하기 전에 경보등이나 부저로서 작업자에게 알려주면 밑실이 없어 바느질의 헛박음으로 인한 바느질땀은 원자재의 불량을 유발하는데 이러한 불량을 미연에 방지하여 봉제능력을 극대화 하는 효과가 있다.As can be seen from the above description, the present invention, if the alarm light or buzzer informs the worker before reaching the minimum limit of the lower thread during sewing, there is no lower thread so that the sewing sweat caused by the lack of sewing causes the defect of raw materials. It is effective to prevent sewing in advance to maximize sewing ability.

Claims (1)

회전가마의 내부에 북집이 설치되고, 그 북집에 밑실감이용 보빈과 북이 설치된 밑실공급장치에 빛을 조사하는 발광LED와 조사된 빛을 감지하는 수광센서 (PHOTODETECTOR)가 설치되어 밑실 보빈에 잔사가 없으면 이를 알려주도록 된 재봉틀의 밑실 감시장치에 있어서,The bobbin is installed inside the rotary kiln, the bobbin for bobbin thread and the bobbin supply device equipped with drum are installed in the bobbin, and the light emitting sensor for detecting the irradiated light is installed in the bobbin bobbin. In the lower thread monitoring device of the sewing machine to tell if there is no, 상기 수광센서(PHOTODETECTOR)는 북집에 구비된 축에 설치함과 아울러 그 축의 끝단을 통해 외부로 신호가 전달되도록 상기 축의 끝단에 수광센서 (PHOTODETECTOR)와 연결되는 전극을 설치하고, 그 전극과 접촉되는 탄성이 있는 접촉부를 상기 회전가마에 설치하여 외부로 신호를 전달되도록 하는 한편, 상기 보빈은 투명의 재질로 구성하고 축에 구멍을 만든 북을 사용한 것을 특징으로 하는 재봉틀의 밑실 감시장치.The light sensor (PHOTODETECTOR) is installed on the shaft provided in the north house, and an electrode connected to the light sensor (PHOTODETECTOR) is installed at the end of the shaft so that a signal is transmitted to the outside through the end of the shaft, the contact with the electrode The bobbin is a bobbin monitoring device of the sewing machine, characterized in that the bobbin is made of a transparent material and using a hole made in the shaft while the elastic contact portion is installed on the rotary kiln.
KR10-2003-0020289A 2003-03-27 2003-03-27 Watch dog thread in a shuttle of sewing machine KR100465132B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007111419A1 (en) * 2006-03-29 2007-10-04 Hoon Sik Cho Method for winding under-thread of sewing machine and bobbin wound with under-thread using the method
KR100824346B1 (en) * 2007-05-18 2008-04-24 (주) 현암바씨스 Apparatus for detecing spare thread amount of sewing machine
KR101012945B1 (en) * 2008-07-25 2011-02-08 현대중공업 주식회사 Vacuum Recovery operated by Compressed Air
US8960111B2 (en) 2010-09-09 2015-02-24 Bobbintel Inc. Apparatus and lower thread winding-spool for detecting the ending region of lower thread of sewing machine
CN108754901A (en) * 2018-05-31 2018-11-06 杰克缝纫机股份有限公司 A kind of line hair cleaning plant at bobbin thread for sewing machine surplus detection

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101077530B1 (en) * 2010-09-09 2011-11-07 주식회사 보빈텔 Apparatus for detecting the end of lower thread of sewing machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007111419A1 (en) * 2006-03-29 2007-10-04 Hoon Sik Cho Method for winding under-thread of sewing machine and bobbin wound with under-thread using the method
KR100824346B1 (en) * 2007-05-18 2008-04-24 (주) 현암바씨스 Apparatus for detecing spare thread amount of sewing machine
KR101012945B1 (en) * 2008-07-25 2011-02-08 현대중공업 주식회사 Vacuum Recovery operated by Compressed Air
US8960111B2 (en) 2010-09-09 2015-02-24 Bobbintel Inc. Apparatus and lower thread winding-spool for detecting the ending region of lower thread of sewing machine
CN108754901A (en) * 2018-05-31 2018-11-06 杰克缝纫机股份有限公司 A kind of line hair cleaning plant at bobbin thread for sewing machine surplus detection

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