EP0337963A2 - Vorrichtung zur Steuerung der Zufuhr eines elastischen Bandes in Nähmaschinen - Google Patents

Vorrichtung zur Steuerung der Zufuhr eines elastischen Bandes in Nähmaschinen Download PDF

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Publication number
EP0337963A2
EP0337963A2 EP89830155A EP89830155A EP0337963A2 EP 0337963 A2 EP0337963 A2 EP 0337963A2 EP 89830155 A EP89830155 A EP 89830155A EP 89830155 A EP89830155 A EP 89830155A EP 0337963 A2 EP0337963 A2 EP 0337963A2
Authority
EP
European Patent Office
Prior art keywords
tape
roller
motor
tension
source
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.)
Granted
Application number
EP89830155A
Other languages
English (en)
French (fr)
Other versions
EP0337963B1 (de
EP0337963A3 (en
Inventor
Aldo Paolini
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0337963A2 publication Critical patent/EP0337963A2/de
Publication of EP0337963A3 publication Critical patent/EP0337963A3/en
Application granted granted Critical
Publication of EP0337963B1 publication Critical patent/EP0337963B1/de
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D05B35/06—Work-feeding or -handling elements not otherwise provided for for attaching bands, ribbons, strips, or tapes or for binding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/30—Devices controlling the forwarding speed to synchronise with supply, treatment, or take-up apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/06—Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/05—Magnetic devices
    • D05D2207/06—Permanent magnets
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2303/00—Applied objects or articles
    • D05D2303/02—Tape
    • D05D2303/04—Tape elastic

Definitions

  • the subject of this invention is a device for controll­ing the feeding of an elastic tape. Said device is applied in sewing machines.
  • crimped areas are usually provided by tensioning the elastic tape while the same is being sewn on the garment, whereby once the sewing is over and tensioning of the elastic tape is dropped, the garment, at the tape area, gets formed with a crimp which is proportional to the tension applied to the elastic tape during the sew­ing operations.
  • it is the operator of the sew­ing machine who applies said tension by hand.
  • said operation requires an operator skill, whereby a difference usually shows in the crimped areas of the same garments at different times of manufacturing.
  • Italian Patent Application No. 40074 A/81 filed on July the 10th, 1981, is also known, concerning an apparatus for controlling the feeding of an elastic tape, includ­ing motor means connected to tape feed rollers, an electromechanical transducer adapted to sense the elastic tape stretching, whereby deformations generated on the mechanical part of the transducer are transformed into electrical signals which, after having been compared with predetermined reference signals, provide actuating signals for said motor means, whereby said rollers are rotated in a certain direction, or in the opposite direction, in order to provide the tape with predetermined tension levels.
  • Said device includes a roller and a pressing means having the tape located therebetween, said tape being pulled in a first direction by the sewing machine forwarding means while said roller is connected to the shaft of a motor rotating in a direction opposite to that of a roller rotated by the pull of said tape under the action of the sewing machine forwarding means.
  • the above device fits in particular those applications where high levels of the elastic tape tension are not required. On the other hand said applications are the most frequently used.
  • the tensioning roller gets from the source of supply a tension-free elastic tape, whereby there is no alterat­ion to the tensioning thereof and therefore to the garm­ent crimping; the device can be mounted on the bed of the sewing machine without the vibrations thereof having any negative influence on the device operation; the tensioning roller stops when all the tape has been used up; and the device is simple, cost effective and easy to be assembled on the sewing machine, convenient in use and higly reliable.
  • the subject device comprising a tensioning roller and a first pressing means having the tape located there­between, said tape being fed by the sewing machine for­warding means, said roller being connected to the shaft of a first motor whose rotation is a function of the tensioning to be given to the tape, with the feature that said device includes a slackening roller mounted between the tensioning roller and the elastic tape source of supply; a second pressing means provided to press the tape against said slackening roller, and a sensor adapted to detect the tape position in the span lying between the tensioning roller and the slackening roller, and connected to a second motor which rotates the slackening roller in either direction to draw tape from the source of supply, or to return it thereto respectively, in order to continuously keep a tape slack loop in said span, whereby the tape is supplied tension-free to said tensioning roller.
  • the subject device is provided with a tensioning roller 4, mounted on shaft 5 of first motor 6.
  • Pressure means comprising a pair of small rollers 7 are mounted on the sides of tensioning roller 4.
  • Elastic tape 8 is pressed between roller 4 and small rollers 7 which keep it tight against substant­ially half of the circumference of roller 4.
  • Said tape, winding around small idle rollers 9 passes underneath pressure shoe 2, together with the garment, not shown in the Figure, to which elastic tape 8 is sewn while being tensioned by said forwarding means 3 in the direction of arrow A.
  • Tape 8 is drawn from a source of supply which, in the case shown in Figure 1, comprises a reel 10 wherefrom the tape unwinds, passes along stationary guide 11,winds around a small idle roller 12, around a slackening roller 13, passes through a stationary guide 14 winding then around tensioning roller 4, as described above. Tape 8 is pressed against slackening roller 13 by a small roller 15.
  • electrical circuit 16 is supplied with electric power at terminals 17 and, by means of a voltage divider 18, through a knob 19, circuit 20 receives by means of a feeder 21 an electric current having different constant values depending upon corresponding positions of knob 19.
  • Said constant electric currents supply electric motor 6 in such a way that shaft 5 thereof is made to rotate in the direction of arrow B, which is opposite to the direction of rotat­ion C of roller 4 being rotated by elastic tape 8 which is pulled, in a direction opposite to direction B of rotation of electric motor 6, by the motion of forward­ing means 3 in the direction of arrow A.
  • a reduction gear may be provided between motor 6 and roller 4.
  • tensioning roller 4 cooperating with small pressure rollers 7, subjects tape 8 to a steady force, opposite to the pulling force of the sewing machine for­warding means, and said steady force will be controlled by voltage divider 18, according to the tension to be generated in the tape and therefore to the crimping to be provided in the garment. Therefore, the elastic tape is kept under tension, while it is gradually drawn by the forwarding means according to the motion thereof, whereby once the sewing is over the required crimping takes place when the tension formerly applied to the elastic tape is released.
  • a threshold controller 22 is further provided in electric circuit 20, in order to prevent further rotat­ion of electric motor 6 when there is no more tape present between tensioning roller 4 and small pressure rollers 7.
  • controller device 22 stops motor 6 when the latter is relieved of the tape load due to the pull of forwarding means 3 of the sewing machine.
  • electric motor 6 acts as a brake on tape 8, in order to keep it tensioned.
  • the armature thereof has been provided with windings in free copper wire, i.e. without an iron support.
  • a continuous and steady tape feeding may be provided, while the electric motor is supplied with a constant current, at low to average voltages.
  • Said device may also be very conveniently applied to sewing machines provided with a differential forwarding means which, being suitably controlled, provides garment crimping while the elastic tape, subjected to a limited tensioning generated by the subject device, is steadily fed and therefore it gets sewn in a smooth pattern on the garment while the latter is being crimped.
  • a differential forwarding means which, being suitably controlled, provides garment crimping while the elastic tape, subjected to a limited tensioning generated by the subject device, is steadily fed and therefore it gets sewn in a smooth pattern on the garment while the latter is being crimped.
  • a sensor 23 for detecting the position of elastic tape 8 within the span between tensioning roller 4 and slackening roller 13.
  • Said sensor comprises for instance a rod 24 pivoted at 25 and carrying, at one end thereof, a member 26, so that when tape 8 winding around the opposite end of rod 24 is pulled in the direction of arrow D, member 26 touches a contact 27 of a photoelectric cell or micro­switch device.
  • the latter closes an electric circuit (not shown in the Figures) for supplying power to a second motor 28 which rotates slackening roller 13 in the direction of arrow E. In that way, due to the pull on tape 8, rotation of roller 13 according to the direction of arrow E causes a certain length of tape to be withdrawn from reel 10.
  • Spring 29 may be replaced with a counterweight position­ed at the end opposite to the one carrying member 26.
  • Stiff rod 24 may be replaced with a resilient rod, clamped at the end, in such a way that distortions there­of caused by tape 8 are transformed into electric signals for controlling electric supply to motor 28, in the way described herein above.
  • sensor 23-motor 28-roller 13 may be inserted in the span between the tape source of supply and the variable speed tape feeding roller as disclosed in U.S. Patent No. 3 856 224, or tape feeding roller rotated in either direction as disclosed in the Italian Patent Application No. 40074 A/81.
  • the electric circuit supplying the motor connected to the tensioning roller is provided with a threshold controller having the features mention­ed above and able to stop the motor when there is no more tape.
  • the device making the subject of this invention may be mounted on the bed of the sewing machine without any possibility that vibrations thereof may cause undesirab­le elastic tape tension variations, while feeding the latter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP89830155A 1988-04-11 1989-04-10 Vorrichtung zur Steuerung der Zufuhr eines elastischen Bandes in Nähmaschinen Expired EP0337963B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT20160/88A IT1217397B (it) 1988-04-11 1988-04-11 Dispositivo migliorato per la regolazione dell' alimentazione di una fettuccia elastica in macchine per cucire
IT2016088 1988-04-11

Publications (3)

Publication Number Publication Date
EP0337963A2 true EP0337963A2 (de) 1989-10-18
EP0337963A3 EP0337963A3 (en) 1989-11-15
EP0337963B1 EP0337963B1 (de) 1992-07-22

Family

ID=11164304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89830155A Expired EP0337963B1 (de) 1988-04-11 1989-04-10 Vorrichtung zur Steuerung der Zufuhr eines elastischen Bandes in Nähmaschinen

Country Status (4)

Country Link
EP (1) EP0337963B1 (de)
DE (1) DE68902167T2 (de)
IT (1) IT1217397B (de)
PT (1) PT90236B (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1374785A (en) * 1970-12-23 1974-11-20 Scient De Lindustrie Textile B Apparatus for delivering yarn at a substantially constant throughput and tension
US3856224A (en) * 1972-07-31 1974-12-24 Movatex Prod Ltd Sewing apparatus
FR2320254A1 (fr) * 1975-08-08 1977-03-04 Dondi Benelli Dore Dispositif electronique pour le reglage de l'enroulement d'un produit sur un noyau, par reglage de la tension
US4013027A (en) * 1976-04-01 1977-03-22 James Cash Machine Co. Dual sewing head serging machine
DE3007652A1 (de) * 1980-02-29 1981-09-10 Union Special Gmbh, 7000 Stuttgart Naehmaschine mit einer einrichtung zum abziehen anzunaehender baender
DE3241362A1 (de) * 1982-11-09 1984-05-10 A. Ott, Gmbh, 8960 Kempten Fadenspannungsregler

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1374785A (en) * 1970-12-23 1974-11-20 Scient De Lindustrie Textile B Apparatus for delivering yarn at a substantially constant throughput and tension
US3856224A (en) * 1972-07-31 1974-12-24 Movatex Prod Ltd Sewing apparatus
FR2320254A1 (fr) * 1975-08-08 1977-03-04 Dondi Benelli Dore Dispositif electronique pour le reglage de l'enroulement d'un produit sur un noyau, par reglage de la tension
US4013027A (en) * 1976-04-01 1977-03-22 James Cash Machine Co. Dual sewing head serging machine
DE3007652A1 (de) * 1980-02-29 1981-09-10 Union Special Gmbh, 7000 Stuttgart Naehmaschine mit einer einrichtung zum abziehen anzunaehender baender
DE3241362A1 (de) * 1982-11-09 1984-05-10 A. Ott, Gmbh, 8960 Kempten Fadenspannungsregler

Also Published As

Publication number Publication date
IT8820160A0 (it) 1988-04-11
EP0337963B1 (de) 1992-07-22
IT1217397B (it) 1990-03-22
DE68902167D1 (de) 1992-08-27
PT90236B (pt) 1994-03-31
PT90236A (pt) 1989-11-10
EP0337963A3 (en) 1989-11-15
DE68902167T2 (de) 1992-12-17

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