EP0009570B1 - Fadenvorratswächter für den Unterfaden einer Nähmaschine - Google Patents

Fadenvorratswächter für den Unterfaden einer Nähmaschine Download PDF

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Publication number
EP0009570B1
EP0009570B1 EP79102827A EP79102827A EP0009570B1 EP 0009570 B1 EP0009570 B1 EP 0009570B1 EP 79102827 A EP79102827 A EP 79102827A EP 79102827 A EP79102827 A EP 79102827A EP 0009570 B1 EP0009570 B1 EP 0009570B1
Authority
EP
European Patent Office
Prior art keywords
gripper
thread
bobbin
light source
light
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
EP79102827A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0009570A1 (de
Inventor
Günter Meier
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.)
Dorina Nahmaschinen GmbH
Original Assignee
Dorina Nahmaschinen 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 Dorina Nahmaschinen GmbH filed Critical Dorina Nahmaschinen GmbH
Publication of EP0009570A1 publication Critical patent/EP0009570A1/de
Application granted granted Critical
Publication of EP0009570B1 publication Critical patent/EP0009570B1/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 invention relates to a thread supply monitor according to the preamble of patent claim 1.
  • Such thread supply monitors are already known which have corresponding openings in the bobbin and hook for optical scanning of the lower thread supply.
  • the gripper shaft is pierced to create a light channel.
  • this possibility does not bring the light source very close to the gripper and is only possible with a gripper design in which the coil is arranged extremely strongly eccentrically to the gripper axis.
  • the bobbin must have a shape that differs from the normal bobbin design so that a thread supply display can be carried out at all.
  • both the light source and the light receiver should be able to be moved close to the gripper in order to eliminate as many interference factors as possible.
  • the innovation is therefore based on the task of deflecting the light beam within the gripper so that the transmitter and receiver can be attached directly to the outside of the gripper.
  • the measure of forming a deflection surface on the gripper body itself which is only acted upon by the light beam for a fraction of the gripper rotation, differs fundamentally from the stationary deflection surface which is present outside the gripper in the prior art. It also has the advantage that it is not possible to use special coil shapes, but rather commercially available coils with openings in the coil flanges.
  • the deflecting surface is advantageously polished to avoid light scattering.
  • the part of the bobbin thread indicator (light source or light receiver) arranged close to the front of the hook must be able to be moved out of its position for changing the bobbin.
  • This part is therefore advantageously pivotally mounted and coupled to the housing flap covering the gripper.
  • the part arranged in front of the gripper (light source or light receiver) is attached to the housing flap itself.
  • the sewing machine shown in FIG. 1 has an upper arm 1, which is connected to a base 3 via a stand 2.
  • the base 3 is supported by a base plate 4 and is equipped with a fabric support arm 5, in which the lower stitch-forming tools, in particular a lockstitch gripper 6, are mounted.
  • the lockstitch gripper 6 (Fig. 2) consists of a hook body 7 and a cover bracket 8, which form the circumferential part of the hook 6, as well as a lower capsule 9 and an upper capsule 10, which form the fixed part of the hook and for receiving a thread spool 11 serve.
  • bobbin thread is wound on the bobbin 11, which forms the seam together with the upper thread during stitch formation.
  • the gripper body 7 has a base 12 which is connected to a hub 13 for fastening the gripper 6 on a gripper shaft 14 which is driven in a known manner and is mounted in the fabric support arm 5.
  • annular cutout 15 is provided which, together with the adjoining wall of the cover bracket 8, forms a raceway for a bearing rib 16 provided on the lower capsule 9.
  • a pin 17 extends outwards from the center of the bottom of the lower capsule 9 and receives a central sleeve 18 which forms part of the upper capsule 10. In the vicinity of its outer end, the pin 17 has an annular groove 19, with which a lock 20 provided on the upper capsule 10 interacts.
  • the lock 20 is provided with a folding lever 21 which is connected to a slide 22 via a hinge pin 23.
  • the slide 22 is slidably mounted in a guide 24 in the upper capsule 10. It also has an opening 25, the edge of which engages in the annular groove 19 of the pin 17 when the folding lever 21 is folded in.
  • the folding lever 21 also has an opening 26 into which the end of the pin 17 is inserted.
  • a radial slot 27 is provided in the bottom of the upper capsule 10, which is attached to the slide 22 for free movement Limit screw 28 is used.
  • the gripper body 7 is provided with an opening 29, the wall of which in the region of the hub 13 is designed as a deflection surface 30 for a light beam 31.
  • the deflection surface 30 extends at an angle to the axis of the gripper 6.
  • the light beam 31 is emitted by a light source 33 attached directly in front of the gripper 6 on the inside of a housing flap 32 on the fabric support arm 5.
  • the thread bobbin 11 equipped with flanges 34 has a plurality of axially parallel bores 35 arranged in pairs at the attachment point of the flanges 34.
  • the bottom of the lower capsule 9 is provided with a slot 36 which is aligned with the openings 25 and 26 in the slide 22 and in the folding lever 21 and with the radial slot 27 in the upper capsule 10.
  • the bore 35, the slot 36, the radial slot 27 and the openings 25 and 26 are formed and arranged with respect to one another in such a way that the light beam 31 emitted by the light source 33 can run axially parallel through the gripper 6 in a certain rotational position as soon as the bores 35 in the bobbin 11 1 and thus the slot 36 in the lower capsule 9 are not covered by the lower thread.
  • the light beam 31 is deflected at the deflection surface 30 and fed to a light receiver 37 which is attached to the fabric support arm 5 directly behind the gripper 6 in the area of the free space between the base 12 and the hub 13 of the gripper body 7.
  • a blinking display diode 38 Arranged on the outside of the upper arm 1 in the field of vision of the operator of the sewing machine is a blinking display diode 38, which indicates that the lower thread in the thread bobbin 11 is going out.
  • FIG. 3 shows a simplified circuit diagram of the electrical components required for the function of light source 33, light receiver 37 and display diode 38.
  • the light source 33 which can consist of an infrared light-emitting diode which is operated in pulses via a flasher unit 46.
  • the light receiver 37 designed as a phototransistor is connected to the line 39 via a series resistor 41 and a connection point 42.
  • a capacitor 43 is connected to the connection point 42 and is connected via a threshold amplifier 44 to the set input S of a flip-flop memory 45.
  • the reset input R of the memory 45 is connected to an arrangement, not shown, which supplies it with a reset pulse when the sewing machine motor, not shown, starts up.
  • the output ⁇ of the memory 45 is connected to the display diode 38, which is connected to the positive pole of the voltage source via a series resistor 47.
  • the bobbin of thread on the bobbin 11 has decreased so far that the light beam 31 can at least partially pass through the bores 35 and thus the slot 36 in the bottom of the lower capsule 9, it is guided onto the deflection surface 30 in the hub 13 of the hook body 7 , deflected there and received by the light receiver 37.
  • the latter becomes conductive and discharges the capacitor 43, which was previously charged via the series resistor 41, as soon as the discharge pulse reaches the set threshold. of threshold amplifier 44 exceeds d. H. the. Unterfadenvordat has dropped below a certain value, the amplifier 44 sends a signal to the set input S of the flip-flop memory 45.
  • both the bores 35 rotate when the lower thread is unwound from the thread spool 11 and the slot 29 when the gripper body 7 rotates independently of one another, so that the triggering of a display pulse requires a certain sewing period. Since a display pulse is only triggered when both the opening 29 and the bores 35 are located in the area of the light beam 31, the response time after falling below one certain thread supply vary somewhat. However, due to a sufficient number of bores 35 arranged in pairs in the thread spool and due to the low thread consumption per stitch formation, the size of the response area of the bobbin thread indicator is not significant.
  • the housing flap 32 on the fabric support arm 5 is folded down and at the same time the light source 33 connected to it is brought out of the area of the gripper 6.
  • the coil 11 can also consist of translucent material. In this case, the holes 35 are not absolutely necessary.
  • the triggering of the response range of the bobbin thread display is then determined by the dimension of the slot 36 in the bottom of the lower capsule 9.
  • control means can also be provided which automatically stop the motor drive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP79102827A 1978-09-15 1979-08-06 Fadenvorratswächter für den Unterfaden einer Nähmaschine Expired EP0009570B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19787827499U DE7827499U1 (de) 1978-09-15 1978-09-15 Fadenvorratswaechter fuer den unterfaden einer naehmaschine
DE7827499U 1978-09-15

Publications (2)

Publication Number Publication Date
EP0009570A1 EP0009570A1 (de) 1980-04-16
EP0009570B1 true EP0009570B1 (de) 1983-03-09

Family

ID=6695134

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79102827A Expired EP0009570B1 (de) 1978-09-15 1979-08-06 Fadenvorratswächter für den Unterfaden einer Nähmaschine

Country Status (4)

Country Link
US (1) US4237807A (enrdf_load_stackoverflow)
EP (1) EP0009570B1 (enrdf_load_stackoverflow)
JP (1) JPS5543897U (enrdf_load_stackoverflow)
DE (1) DE7827499U1 (enrdf_load_stackoverflow)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4188901A (en) * 1979-01-25 1980-02-19 The Singer Company Low bobbin thread detection system
DE3014753C2 (de) * 1980-04-17 1985-08-08 Pfaff Haushaltmaschinen Gmbh, 7500 Karlsruhe Vorratswächter für den Unterfaden einer Nähmaschine
SE426717B (sv) * 1981-06-16 1983-02-07 Husqvarna Ab Signalanordning i symaskin for avkenning och indikering av tradinnehallet pa en spole
IT1161584B (it) * 1982-03-31 1987-03-18 Singer Co Sistema rivelatore e indicatore di esaurimento del filo di bobina
GB2136564B (en) * 1983-02-18 1986-06-11 El Sew Con Ltd Monitoring textile thread
GB2143549B (en) * 1983-06-16 1987-01-21 Spencer Wright Ind Inc Tufting machine
US4619213A (en) * 1983-09-30 1986-10-28 Tokyo Juki Industrial Co., Ltd Drive control mechanism of sewing machine
DE3446682C1 (de) * 1984-12-21 1986-04-10 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Einrichtung zur UEberwachung des Unterfadenvorrates einer Naehmaschine
DE8516211U1 (de) * 1985-06-03 1985-07-18 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Nähmaschine mit einem Fadenwächter für den Unterfaden
DE3625630C2 (de) * 1986-07-29 1995-04-27 Mardix Bar Cochva Fadenüberwachungsvorrichtung für eine Nähmaschine
DE3635140A1 (de) * 1986-10-15 1988-04-21 Zinser Textilmaschinen Gmbh Optische abtastvorrichtung zur ermittlung einer leerlaufenden vorlagenspule bei einer spinn- oder zwirnmaschine
US4763589A (en) * 1987-10-13 1988-08-16 Ssmc Inc. Solar powered indicating device for sewing machines
JP2727017B2 (ja) * 1989-06-09 1998-03-11 蛇の目ミシン工業株式会社 ミシンの下糸供給量制御装置
JP2899628B2 (ja) * 1989-07-14 1999-06-02 蛇の目ミシン工業株式会社 ミシンの下糸量検出表示装置
JP2836252B2 (ja) * 1990-12-14 1998-12-14 ブラザー工業株式会社 ミシンの下糸残量検出装置
JPH06273A (ja) * 1992-06-22 1994-01-11 Brother Ind Ltd ミシンの下糸残量検出装置
IL106535A (en) * 1993-07-30 1996-10-31 Orisol Original Solutions Ltd Device for use with a bobbin-less coil of thread
JP6626715B2 (ja) * 2016-01-14 2019-12-25 Juki株式会社 ミシン

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082968A (en) * 1961-07-25 1963-03-26 Western Electric Co End of strand control mechanism
US3599586A (en) * 1970-06-10 1971-08-17 Singer Co Bobbin thread depletion detector for sewing machines
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

Also Published As

Publication number Publication date
JPS5543897U (enrdf_load_stackoverflow) 1980-03-22
DE7827499U1 (de) 1978-12-21
US4237807A (en) 1980-12-09
EP0009570A1 (de) 1980-04-16

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