EP0038418B1 - Vorratswächter für den Unterfaden einer Nähmaschine - Google Patents

Vorratswächter für den Unterfaden einer Nähmaschine Download PDF

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Publication number
EP0038418B1
EP0038418B1 EP81101814A EP81101814A EP0038418B1 EP 0038418 B1 EP0038418 B1 EP 0038418B1 EP 81101814 A EP81101814 A EP 81101814A EP 81101814 A EP81101814 A EP 81101814A EP 0038418 B1 EP0038418 B1 EP 0038418B1
Authority
EP
European Patent Office
Prior art keywords
light
transmitter
microcomputer
light transmitter
sewing machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81101814A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0038418A1 (de
Inventor
Patrice Jean Kemmel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pfaff Haushaltsmaschinen GmbH
Original Assignee
Pfaff Haushaltsmaschinen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pfaff Haushaltsmaschinen GmbH filed Critical Pfaff Haushaltsmaschinen GmbH
Publication of EP0038418A1 publication Critical patent/EP0038418A1/de
Application granted granted Critical
Publication of EP0038418B1 publication Critical patent/EP0038418B1/de
Expired legal-status Critical Current

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Classifications

    • 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

Definitions

  • the device specified in the preamble of claim 1 as known requires a strong light source, since the openings in the bobbin and hook that are available for optically scanning the bobbin thread thread, in particular at high sewing speeds, only very briefly during each stitch formation are located and the thread supply can only be scanned in this position of agreement. The time for measuring the thread supply is therefore extremely short and also depends on the speed of the hook and the bobbin carrying the thread.
  • the invention specified in claim 1 is based on the object of significantly reducing the power loss of the light transmitter in order to achieve a long service life of the light transmitter with a high effective light yield.
  • a further reduction in the power loss of the light transmitter can be achieved by the arrangement according to claim 2, since due to the plurality of thread turns arranged side by side on the thread spool, a monitoring process is not necessary with each looper revolution in order to indicate the end of the bobbin thread supply in good time.
  • the gripper drive shown in FIG. 1 has a drive shaft 1 driven by a main shaft, not shown, on which a gripper body 2, which is only partially shown, is fastened.
  • the gripper body 2 is provided with an opening 3 which extends obliquely to the gripper axis and whose part of the circumferential surface directed against the axis of the drive shaft 1 is designed as a reflection surface 4 for a light beam 5.
  • This is emitted by a light transmitter 6, passes through bores 7 in a bobbin 9 wound with thread 8 and bores 10 and 11 in a bobbin case 12 on the reflection surface 4, is deflected there and fed to a light receiver 13.
  • the bobbin case 12 is mounted in a known manner, not shown, in the gripper body 2 and has a center pin 14 which carries the coil 9.
  • the bobbin case 12 stands still while the hook body 2 rotates.
  • the bobbin 9 also rotates during the sewing process by pulling off the thread 8, but at a very low speed.
  • the position of the bores 10 and 11 of the bobbin case 12 does not change with respect to the axis of the light beam 5 between the light transmitter 6 and receiver 13, while the reflection surface 4 and also the bores 7 in the coil 9 only allow passage of the light beam temporarily.
  • a pulse generator disc 15 of a pulse generator 16 is fastened on the drive shaft 1.
  • An opening 19 cooperating with a light-emitting diode 17 and a photo transistor 18 is provided in the pulse generator disk 15.
  • Fig. 2 shows a simplified circuit diagram, the components required for the function of the electrical control of the thread monitor. From the positive pole of a regulated voltage source current flows through the light emitting diode 17 and a resistor 20 to ground. The light-emitting diode 17 is arranged on one side of the pulse generator disc 15, on the other side of which the phototransistor 18 is attached. This is connected with its collector to the positive pole and with its emitter via a resistor 21 to ground. The connecting line between the phototransistor 18 and the resistor 21 is connected to the input E3 of a microcomputer 22.
  • the base of the Darlington transistor 24 is connected to the output A1 of the microcomputer 22.
  • a resistor 28 connected to ground is connected to the input E2.
  • a capacitor 30 is connected to the emitter of the phototransistor 13 and is connected via an amplifier 31 to an input E1 of the microcomputer 22.
  • a line leads from an output A2 of the microcomputer 22 via a resistor 32 and a light-emitting diode 33 serving as a display element to ground.
  • a subroutine is started, which is shown in FIG. 3 as a flow chart.
  • the voltage levels corresponding to the program commands at the inputs and outputs of the microcomputer 22 and the voltage profile at the light receiver 13 can be seen from FIG. 4.
  • a first command BO is issued, a test as to whether output A2 of the microcomputer 22 is set. If it is set, there is a jump to the end of the subroutine and the light transmitter 6 remains de-energized.
  • output A2 is set, current flows to ground via LED 33 and diode 33 flashes to indicate the end of the thread supply. During the flashing time, there is no control and thus the load on the light transmitter 6.
  • the command B1 is issued, whereby the output A1 of the microcomputer 22 is set.
  • the Darlington transistor 24 becomes conductive and a high current flows through the light transmitter 6, which thus briefly emits light of high intensity.
  • the B2 command "wait” is given to compensate for the delay time of the light receiver 13 and also to allow any switching faults S1 (FIG. 4) that occur when the light receiver 13 is switched on to subside.
  • the thread 8 on the thread bobbin 9 has decreased so far that the light beam 5 can at least partially pass through the bores 7 in the bobbin 9 and the bores 10 and 11 in the bobbin case 12, it will be on the reflection surface 4 in the hook body 2 deflected the light receiver 13. In this case, it becomes conductive and current flows through the resistor 22 to ground.
  • the voltage that builds up is supplied to the input E1 of the microcomputer 22 via the capacitor 30 and the amplifier 31.
  • the capacitor 30 advantageously serves to filter out direct currents caused by daylight and low-frequency alternating currents caused by sewing light.
  • the actuation of the starter resistor 25 is renewed The start of the sewing machine. Before changing the coil 9, the machine must be stopped by switching off the starter resistor 25, as a result of which the wiper moves to the switch-off segment 27 and the voltage level at the input E2 of the microcomputer 22 goes to zero.
  • the starter resistor 25 is actuated to work the sewing machine. As soon as its wiper moves from the shutdown segment 27 to the resistance body 26, a reference voltage builds up at the input E2 of the microcomputer 22 through the resistor 28. Their switch-on pulse resets the output A2 of the microcomputer 22 and thus switches off the LED 33.
  • the light transmitter 6 can also be connected to an unregulated voltage source.
  • the resistor 23 is then advantageously moved into the emitter branch of the transistor 24 in order to switch it as a constant current source.
  • the pulse generator 16 can of course also be arranged on another shaft rotating in synchronism with the drive shaft 1, for example on the arm shaft.
  • the monitoring processes are already reduced to half in the sewing machines usually equipped with lockstitch grippers, in which the gripper rotates twice per arm shaft revolution.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP81101814A 1980-04-17 1981-03-12 Vorratswächter für den Unterfaden einer Nähmaschine Expired EP0038418B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3014753 1980-04-17
DE3014753A DE3014753C2 (de) 1980-04-17 1980-04-17 Vorratswächter für den Unterfaden einer Nähmaschine

Publications (2)

Publication Number Publication Date
EP0038418A1 EP0038418A1 (de) 1981-10-28
EP0038418B1 true EP0038418B1 (de) 1983-04-06

Family

ID=6100265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101814A Expired EP0038418B1 (de) 1980-04-17 1981-03-12 Vorratswächter für den Unterfaden einer Nähmaschine

Country Status (4)

Country Link
US (1) US4432297A (ja)
EP (1) EP0038418B1 (ja)
JP (1) JPS6023636B2 (ja)
DE (1) DE3014753C2 (ja)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1161584B (it) * 1982-03-31 1987-03-18 Singer Co Sistema rivelatore e indicatore di esaurimento del filo di bobina
GB8304579D0 (en) * 1983-02-18 1983-03-23 Rawson J W Monitoring textile thread
US4619213A (en) * 1983-09-30 1986-10-28 Tokyo Juki Industrial Co., Ltd Drive control mechanism of sewing machine
JPS60176787U (ja) * 1984-04-28 1985-11-22 ジューキ株式会社 ミシンの下糸残量検知装置
DE3446682C1 (de) * 1984-12-21 1986-04-10 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Einrichtung zur UEberwachung des Unterfadenvorrates einer Naehmaschine
DE3447138A1 (de) * 1984-12-22 1986-07-03 Anton Cramer GmbH & Co, 4402 Greven Einrichtung zur unterfadenueberwachung, insbesondere an einer doppelsteppstichnaehmaschine
DE8516211U1 (de) * 1985-06-03 1985-07-18 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Nähmaschine mit einem Fadenwächter für den Unterfaden
DE3540126A1 (de) * 1985-11-13 1987-02-19 Baeckmann Reinhard Verfahren und einrichtung zur integrierten ueberwachung des ober- und unterfadens in naehmaschinen und -automaten und des naehprozesses
JP2762690B2 (ja) * 1990-05-18 1998-06-04 ブラザー工業株式会社 ミシンの下糸量検出装置
JP2675902B2 (ja) * 1990-05-22 1997-11-12 ジューキ株式会社 ミシンの下糸残量検出装置
DE4024846C1 (ja) * 1990-08-04 1992-01-02 G.M. Pfaff Ag, 6750 Kaiserslautern, De
US5140920A (en) * 1990-09-07 1992-08-25 The Charles Stark Draper Laboratory, Inc. Apparatus for detecting skipped stitches
GB2301600A (en) * 1995-05-30 1996-12-11 Gareth Richard Jones Sewing machine bobbin capacity indicator
GB2312685A (en) * 1996-04-30 1997-11-05 Thomas Isaac Passmore Bobbin thread payoff detection device for sewing machines
KR100471639B1 (ko) * 2004-11-04 2005-03-14 윤경기 잔사를 감지하는 재봉틀의 밑실 공급장치
DE102006014361B3 (de) * 2006-03-28 2007-05-31 Rsg Rombold System Gmbh & Co. Kg Vorrichtung und Verfahren zur Überwachung eines auf einer Fadenspule aufgewickelten Fadens

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845320A (en) * 1973-03-26 1974-10-29 R Winberg Method and means for detecting the approaching end of a thread and a bobbin therefor
JPS5316848Y2 (ja) * 1973-06-22 1978-05-04
JPS588874B2 (ja) * 1975-10-09 1983-02-17 ブラザー工業株式会社 ミシンの下糸残り量検出方法及びその装置
JPS5372078A (en) * 1976-12-09 1978-06-27 Kojin Kk Production of biaxially oriented polyvinylalcohol film
US4195292A (en) * 1978-03-09 1980-03-25 Puhich Joseph M Programmable bobbin thread detector
US4163158A (en) * 1978-04-25 1979-07-31 The Singer Company Sewing machine bobbin thread run-out alarm using reflected light
US4178866A (en) * 1978-06-19 1979-12-18 The Singer Company Adjustable bobbin thread run-out indicator
DE7827499U1 (de) * 1978-09-15 1978-12-21 Dorina Naehmaschinen Gmbh, 7500 Karlsruhe Fadenvorratswaechter fuer den unterfaden einer naehmaschine
DE2848612C2 (de) * 1978-11-09 1981-05-27 Pfaff Haushaltsmaschinen GmbH, 7500 Karlsruhe Impulsgeber eines Nähmaschinenantriebes
US4193363A (en) * 1979-04-19 1980-03-18 The Singer Company Lint minimization in sewing machine bobbin alarm
US4188902A (en) * 1979-05-18 1980-02-19 The Singer Company Bobbin thread run-out detectors
JPS565554A (en) * 1979-06-27 1981-01-21 Hitachi Metals Ltd Magnetic toner
DE2942844C2 (de) * 1979-10-24 1987-01-02 Pfaff Haushaltmaschinen Gmbh, 7500 Karlsruhe Nähmaschine mit einer Steuereinrichtung für den Antrieb eines Schrittmotors zur Verstellung der Überstichbreite und/oder der Vorschublänge

Also Published As

Publication number Publication date
DE3014753C2 (de) 1985-08-08
DE3014753A1 (de) 1981-10-22
EP0038418A1 (de) 1981-10-28
JPS56163692A (en) 1981-12-16
JPS6023636B2 (ja) 1985-06-08
US4432297A (en) 1984-02-21

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