EP0597494A1 - Griffe tireuse pour l'insertion de fils de trame auxiliaires dans la foule de la jointure dans un métier à tisser les jointures - Google Patents

Griffe tireuse pour l'insertion de fils de trame auxiliaires dans la foule de la jointure dans un métier à tisser les jointures Download PDF

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Publication number
EP0597494A1
EP0597494A1 EP93118379A EP93118379A EP0597494A1 EP 0597494 A1 EP0597494 A1 EP 0597494A1 EP 93118379 A EP93118379 A EP 93118379A EP 93118379 A EP93118379 A EP 93118379A EP 0597494 A1 EP0597494 A1 EP 0597494A1
Authority
EP
European Patent Office
Prior art keywords
gripper
seam
pull
auxiliary weft
arm
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.)
Ceased
Application number
EP93118379A
Other languages
German (de)
English (en)
Inventor
Hans Eugen Häcker
Peter Defranceski
Norbert Kohfink
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.)
Novatech GmbH Siebe und Technologie fuer Papier
Original Assignee
Novatech GmbH Siebe und Technologie fuer Papier
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 Novatech GmbH Siebe und Technologie fuer Papier filed Critical Novatech GmbH Siebe und Technologie fuer Papier
Publication of EP0597494A1 publication Critical patent/EP0597494A1/fr
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D3/00—Woven fabrics characterised by their shape
    • D03D3/04—Endless fabrics
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0054—Seams thereof

Definitions

  • the invention relates to a pull-through gripper for inserting an auxiliary weft thread into the seam weaving compartment in a seam weaving machine.
  • the gripper has a movable gripper arm with a collet for gripping the auxiliary weft thread.
  • a warp thread fringe is detached and held in place by a separator (DE-U-87 13 074, EP-A-0 301 174 and DE-U-90 02 278) from the large number of warp thread fringes projecting from each end of the fabric.
  • a transfer rapier transports this warp thread fringe to a pull-through rapier which then enters it as an auxiliary weft thread in the seam weaving compartment, in such a way that the auxiliary weft thread is initially taut in the seam weaving compartment.
  • the pull-through gripper is of the type mentioned at the beginning and is e.g. known from DE-U-81 22 449, EP-A-0 043 441 and EP-A-0 236 601.
  • the pull-through gripper is designed in modern seam weaving machines in such a way that it checks the presence of the warp thread fringe at the same time, so that weaving seam errors which would arise from a missing warp thread fringe are avoided. If there is no warp thread fringe, the seam weaving machine is shut down in order to be able to rectify the error immediately and thus avoid costly reworking.
  • the collets of the pull-through grippers are usually designed as electrical switches with two switch contact surfaces which touch one another in the absence of a warp thread fringe and thereby close an electrical circuit.
  • a collet has detected a warp thread fringe which is made of plastic and is therefore an insulator, it lies between the two contact surfaces, so that the electrical circuit is not closed, and consequently no signal is emitted.
  • dirt accumulates in the collets and thus also in the switch, which prevents the monitoring function after an unpredictable period of time, since the dirt acts as an insulator.
  • the seam weaving machine then continues to run despite the missing warp thread fringe.
  • Another difficulty is that if the electrical signal line is interrupted, the monitoring function fails, i.e. the electrical circuit can no longer be closed even if there is no warp thread fringe.
  • the invention has for its object to improve the reliability of the operation of a seam weaving machine.
  • this object is achieved in that the gripper arm of the pull-through gripper has a device for measuring the mechanical tension present within the gripper arm.
  • An important advantage of the invention is that the measurement of the bending moment gives a quantitative statement about the force with which the auxiliary weft thread is inserted into the shed. This resilience is of crucial importance for the quality of the woven seam. The invention enables a reproducibility of this clamping force.
  • the mechanical stress occurring within the gripping arm is preferably measured by means of strain gauges which are attached to the surface of the gripping arm.
  • the pull-through gripper is preferably rotatably mounted on one end of the gripping arm, the collet is located on the other end of the gripping arm and the strain gauges are attached as far as possible from the pivot point.
  • strain gauges are attached at opposite points on the outside of the rotating arm, so that both the pressure and the tensile force resulting from the bending moment can be determined and the measurement signal can thus be amplified.
  • Each pull-through gripper 10, 11 consists of a U-shaped bent gripper arm 12, 13 which is rotatably mounted on one axis of rotation 9 at one end and has collets 14, 15 at the other end, the front end.
  • the pull-through grippers can also be movable in a straight line.
  • the functional sequence is in any case that the pull-through gripper 11 is moved through the seam weaving compartment 1, so that the collet 15 is located at the tissue end 4.
  • a warp thread fringe 6, which is separated by a separator (not shown) and held by a transfer gripper (also not shown) is inserted into the collet 15 (FIG. 2).
  • the pull-through hook 11 then pivots clockwise through the seam weaving shed 1 as seen in FIGS.
  • the pulling of the warp thread fringes 7 protruding from the fabric end 5 is carried out in an analogous manner by a rotary movement of the pulling gripper 10. Since the rotating movement of the pulling grippers 10 and 11 takes place alternately and in the opposite direction, they can be pivoted rigidly about the axis of rotation 9. The pull-through grippers 10 and 11 can, however, also be movable independently of one another.
  • each collet 14, 15 has a tapered end 21, behind which there is an incision 22, which in turn is followed by the tubular main part 23.
  • a clamping piston 24 is mounted, which is driven pneumatically.
  • a thread can be tightened in the incision 22.
  • the incision 22 is pulled slightly forward on the bottom, so that when viewed from the side there is a rectangular notch 26 in which the thread is clamped by the clamping piston 24 without the risk that the thread in its transverse direction comes out of the collet 14 , 15 slips or is pulled.
  • the collets 14, 15 are simpler in construction than the conventional collets working with an electrical contact, since all the parts required for the electrical system, e.g. the plugs, sockets, insulating parts, cables within the tubular gripper arm are eliminated. Likewise, the insulation required between the collet and the collet outer part is not necessary with conventional collets.
  • the bending moment exerted on the gripper arms 12, 13 depends on whether a warp thread fringe 6, 7 which is now used as an auxiliary weft thread is inserted in the collet 14, 15, and this bending moment is proportional to the force with which the auxiliary weft thread 6, 7 is caused by the Seam weaving compartment 1 are pulled.
  • the increase in the bending moment occurring at the angular position a (FIG. 3) of the pulling movement is of importance for the reproducibility and quality of the woven seam.
  • strain gauges 16 and 18 are located opposite each other on the largest possible lever arm attached to the positions of the gripper arm 12 and in the same way strain gauges 17 and 19 on the gripper arm 13. The strain gauges can also be placed elsewhere if the signal size is sufficient. These strain gauges 16 to 19 are sensors whose electrical resistance is greatly influenced by the smallest changes in length. The electrical resistance of the strain gauges can therefore be used as a measure of mechanical strains and stresses.
  • a limit amplifier 20 (FIG.
  • strain gauges 16 to 19 are connected downstream of the strain gauges 16 to 19 and the signal emanating from the strain gauges 16 to 19 is processed in such a way that the seam weaving machine is stopped when these signals indicate that the pulling gripper 10 approaches the end of the pulling movement , 11 a certain lower limit value of the bending moment is not reached. From the course of the signal can also be determined whether the auxiliary weft thread is broken; this can be seen from a sudden drop in the bending moment.
  • the four strain gauges 16 to 19 are interconnected to form a measuring bridge. This measuring bridge can either be attached completely to a gripper 12 or 13 or in each case as a half bridge distributed over two grippers 12, 13.
  • the strain gauges 16 to 19 are attached to the tube of the gripper arm 12, 13 in such a way that one strain gauge 16, 17 located on the inside and the other strain gauge 18, 19 on the outside.
  • the internal strain gauge 16, 17 is compressed, while the outer strain gauge 18, 19 is stretched. This arrangement results in a particularly large signal level.
  • This signal is evaluated by the limit value amplifier 20, in which a switching point can be set variably.
  • the mechanical tension can thus be measured precisely and if the value falls below the set minimum value of the mechanical tension, the seam weaving machine can be stopped by a signal to a higher-level control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP93118379A 1992-11-13 1993-11-12 Griffe tireuse pour l'insertion de fils de trame auxiliaires dans la foule de la jointure dans un métier à tisser les jointures Ceased EP0597494A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9215498U 1992-11-13
DE9215498U DE9215498U1 (de) 1992-11-13 1992-11-13 Durchziehgreifer zum Eintragen eines Hilfsschußfadens in das Nahtwebfach bei einer Nahtwebmaschine

Publications (1)

Publication Number Publication Date
EP0597494A1 true EP0597494A1 (fr) 1994-05-18

Family

ID=6886020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93118379A Ceased EP0597494A1 (fr) 1992-11-13 1993-11-12 Griffe tireuse pour l'insertion de fils de trame auxiliaires dans la foule de la jointure dans un métier à tisser les jointures

Country Status (6)

Country Link
US (1) US5358015A (fr)
EP (1) EP0597494A1 (fr)
JP (1) JPH07300736A (fr)
CA (1) CA2102846A1 (fr)
DE (1) DE9215498U1 (fr)
FI (1) FI935003A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20105091U1 (de) * 2001-03-23 2002-09-05 Wangner Finckh GmbH & Co. KG, 72760 Reutlingen Spannzange für Nahtwebmaschinen
DE202005018856U1 (de) * 2005-12-01 2007-04-12 Wangner Gmbh & Co Kg Halterung für das Webblatt einer Nahtwebmaschine, um den Nahtschussfaden wahlweise mittels Schrägstellung der Riete oder verfahrbarer Rolle einzuwälzen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9913244D0 (en) * 1999-06-08 1999-08-04 Scapa Group Plc Automatic seaming machine
TW512190B (en) * 2000-04-11 2002-12-01 Textilma Ag Narrow fabric needle loom for producing a strip-shaped tissue and corresponding strip-shaped tissue

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1710274A1 (de) * 1966-05-31 1971-10-14 Heberlein & Co Ag Schussfadenwaechter an einem Webstuhl
US4170951A (en) * 1978-12-14 1979-10-16 The Singer Company Skipped stitch detection system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3025909C2 (de) * 1980-07-09 1983-07-14 Hermann Wangner Gmbh & Co Kg, 7410 Reutlingen Verfahren und Vorrichtung zum Herstellen einer Webnaht zwischen zwei Gewebeenden
DE8122449U1 (de) * 1981-07-30 1983-01-13 Fa. F. Oberdorfer, 7920 Heidenheim Vorrichtung zum verteilen der kettfadenenden waehrend der nahtbildung bei papiermachergeweben
EP0236601B2 (fr) * 1986-02-22 1996-09-04 Asten Group Inc. Machine automatique pour la jonction de deux extrémités de bande
DE3446941A1 (de) * 1984-12-21 1986-07-03 F. Oberdorfer, 7920 Heidenheim Verfahren zur herstellung einer stecknaht zum endlosmachen eines gewebebandes und nahtungsmaschine
US5027483A (en) * 1990-01-31 1991-07-02 Asten Group, Inc. Apparatus for selectively releasing yarns from a fringe
DE4133374A1 (de) * 1991-10-05 1993-04-08 Wetec Webmaschinentechnik Gmbh Fadenvereinzeler, der aus einem gewebe gezielt einzelne oder mehrere faeden entnehmen kann
US5183081A (en) * 1992-02-07 1993-02-02 Asten Group, Inc. Weave shed formation apparatus for end reweaving type joining apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1710274A1 (de) * 1966-05-31 1971-10-14 Heberlein & Co Ag Schussfadenwaechter an einem Webstuhl
US4170951A (en) * 1978-12-14 1979-10-16 The Singer Company Skipped stitch detection system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20105091U1 (de) * 2001-03-23 2002-09-05 Wangner Finckh GmbH & Co. KG, 72760 Reutlingen Spannzange für Nahtwebmaschinen
US6948531B2 (en) 2001-03-23 2005-09-27 Wangner Finckh Gmbh & Co. Kg Gripping collet for seam-weaving machines
DE202005018856U1 (de) * 2005-12-01 2007-04-12 Wangner Gmbh & Co Kg Halterung für das Webblatt einer Nahtwebmaschine, um den Nahtschussfaden wahlweise mittels Schrägstellung der Riete oder verfahrbarer Rolle einzuwälzen

Also Published As

Publication number Publication date
FI935003A0 (fi) 1993-11-12
JPH07300736A (ja) 1995-11-14
DE9215498U1 (de) 1994-03-17
US5358015A (en) 1994-10-25
FI935003A (fi) 1994-05-14
CA2102846A1 (fr) 1994-05-14

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