EP0839938A1 - Procédé pour couper un fil de trame à insérer dans un métier à griffes - Google Patents

Procédé pour couper un fil de trame à insérer dans un métier à griffes Download PDF

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Publication number
EP0839938A1
EP0839938A1 EP96810671A EP96810671A EP0839938A1 EP 0839938 A1 EP0839938 A1 EP 0839938A1 EP 96810671 A EP96810671 A EP 96810671A EP 96810671 A EP96810671 A EP 96810671A EP 0839938 A1 EP0839938 A1 EP 0839938A1
Authority
EP
European Patent Office
Prior art keywords
drives
gripper
drive
weaving
rapier
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
EP96810671A
Other languages
German (de)
English (en)
Other versions
EP0839938B1 (fr
Inventor
Rudolf Vogel
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.)
Itema Switzerland Ltd
Original Assignee
Sultex AG
Maschinenfabrik Rueti AG
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 Sultex AG, Maschinenfabrik Rueti AG filed Critical Sultex AG
Priority to DE59606236T priority Critical patent/DE59606236D1/de
Priority to EP96810671A priority patent/EP0839938B1/fr
Publication of EP0839938A1 publication Critical patent/EP0839938A1/fr
Application granted granted Critical
Publication of EP0839938B1 publication Critical patent/EP0839938B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/70—Devices for cutting weft threads
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/271—Rapiers
    • D03D47/272—Rapier bands
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/27—Drive or guide mechanisms for weft inserting
    • D03D47/275—Drive mechanisms

Definitions

  • the invention relates to a method for separating a weft thread to be entered according to the preamble of claim 1 and a rapier weaving machine for carrying out the method.
  • a method can be used that is described in EP-0 284 766.
  • a separating device is activated by a computer after the correct weft has been entered using input weaving parameters and data of the weft thread.
  • EP-0 679 744 describes a weft thread cutting device for a rapier weaving machine which is actuated independently of the main shaft of the weaving machine.
  • the device has two Cutting blades and two drives, which are controlled according to the weaving cycle.
  • Two types of grippers are known, namely the bar gripper and the belt gripper, each of which is driven by the main shaft of the weaving machine, the rotary movement of the main shaft being converted into a reciprocating movement.
  • This type of drive cyclical deviations of the rotational angle position at the end of the main shaft occur due to the torque to be transmitted from the main shaft, which lead to deviations in the position of the gripper when a weft thread is separated. These deviations depend on the fabric to be manufactured.
  • the weaving cycle is controlled on the basis of the angle of rotation of the main shaft, the scanning means being arranged in the region of the output shaft of the main motor. With these scanning devices, the angle of rotation deviation at the end of the main shaft is not recorded, so the cutting time is determined independently of the actual movement of the gripper.
  • the cutting time is determined depending on the type of weft. If different weft yarns are specified by the pattern data, the advantageous point in time is selected from the different cutting times. A fabric produced on this basis has weft ends of different lengths on the fabric edge.
  • the invention as characterized in the claims, is based on the object of providing a method for severing a weft thread to be entered, in which the disadvantage mentioned does not occur.
  • FIGS. 1 and 2 In the rapier weaving machine in question here, the insertion of a weft thread by means of a bringer and holster rapier is seen from the left from the weaver stand side.
  • the weaving machine contains a machine control 20, which controls the weaving machine on the basis of weaving machine control parameters and pattern data.
  • the rapier weaving machine contains a main drive 1 and a main shaft 2 as well as mechanically derived drives for a shedding machine 3, for the reeds 4, for the rapier gripper 5, for the holer rapier 6 and for a jacquard machine 7.
  • a cutting device 8 is provided which separates the weft thread from an already woven-in weft thread before it is inserted into the shed and has a drive 9 which is independent of the main shaft 1.
  • the torque to be applied by the main motor is essentially dependent on the ratio of the number of heald frames or jacquard strands which are moved into the upper compartment or lower compartment per weaving cycle.
  • the main drive 1 During the lifting, the main drive 1 must apply a high torque in order to drive the shedding device. When changing subject i.e. Lowering the main drive motor is relieved due to the tensile forces that occur. In simple terms, when lifting, the main drive drives the shedding device and when lowering, the main drive is driven by the shedding device.
  • the drive for the carrier gripper 5 comprises a space crank mechanism 11 with a toothed segment 12, a belt wheel 13 with a toothed wheel 14, a gripper belt 15 and a gripper head 16. Because the space crank mechanism is arranged at the end of the drive shaft 1 , the angular deviation at the end of the main shaft from the space crank gear to the belt wheel 13 transfer. The torsion in the drivetrain increases the angular deviation.
  • FIG 3 shows the situation when the cutting time is determined on the basis of the machine control parameters, in particular the angle of rotation of the main shaft.
  • the cutting device is actuated by the control parameters when the gripper head 16 has reached the position labeled "A" with respect to the cutting device 8. This position is called the target position. Due to the deviations in the angle of rotation, the gripper head 16 can pass the target position A or cannot reach it. If the looper head 16 passes over the target position A in the direction of the position B, the weft thread 18 can tear. If the hook head 16 remains in the direction of the position C relative to the desired position, then the weft thread 18 is loose or not correctly clamped. In both cases, shooting errors are expected.
  • the target position of the gripper head 16 is predetermined. If the gripper head 12 reaches the desired position, the cutting device is actuated.
  • the target position of the gripper head is determined by at least one sensor and / or on the basis of the binding data which are stored in the machine control device. Heavy lifting is assumed, ie a large part of the warp threads have to be lifted. Due to the resulting angle of rotation deviation, the gripper, for example, will follow this deviation. If a sensor 31 is used to scan the position of the gripper head 16, the actual value of the angle of rotation from the sensor is compared with the target value of the angle of rotation on the main shaft of the drive motor 1 and the cutting device 8 is actuated with a corresponding delay.
  • the actuation of the cutting device is delayed with the aid of an auxiliary parameter until the gripper body 16 has reached the desired position.
  • the cutting device is actuated earlier.
  • the cutting device 8 is thus actuated without the inclusion of weft data, in particular weft type.
  • FIG. 4 shows a preferred embodiment of a weft thread cutting device 8.
  • the cutting device comprises two linear motor drives 22, 23 and two cutting blades 24, 25, which are each connected to a linear motor drive.
  • the linear drives are known from the European patent application with the publication number 0 347 626, so that a detailed description is omitted.
  • FIG. 2 shows a selection of possible locations for the arrangement of a sensor 31 for scanning the gripper position.
  • the senor 31 can also be arranged on a cutting blade 25 in such a way that the weft thread 18 lies against the sensor 31 in the deflection area.
  • the sensor can be a thread tension sensor, the measurement variable of which is used to control the linear drives 22, 23.
  • a cutting device operating within a weaving cycle is controlled depending on the position of the gripper within the weaving cycle.
  • a rapier weaving machine contains means (20, 31) for carrying out a setpoint / actual value comparison of the rotation angle of the main shaft or for determining the position of the rapier using the weaving parameters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP96810671A 1996-10-07 1996-10-07 Procédé pour couper un fil de trame à insérer dans un métier à griffes Expired - Lifetime EP0839938B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59606236T DE59606236D1 (de) 1996-10-07 1996-10-07 Verfahren zum Abtrennen eines einzutragenen Schussfadens in einer Greiferwebmaschine
EP96810671A EP0839938B1 (fr) 1996-10-07 1996-10-07 Procédé pour couper un fil de trame à insérer dans un métier à griffes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96810671A EP0839938B1 (fr) 1996-10-07 1996-10-07 Procédé pour couper un fil de trame à insérer dans un métier à griffes

Publications (2)

Publication Number Publication Date
EP0839938A1 true EP0839938A1 (fr) 1998-05-06
EP0839938B1 EP0839938B1 (fr) 2000-12-20

Family

ID=8225716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810671A Expired - Lifetime EP0839938B1 (fr) 1996-10-07 1996-10-07 Procédé pour couper un fil de trame à insérer dans un métier à griffes

Country Status (2)

Country Link
EP (1) EP0839938B1 (fr)
DE (1) DE59606236D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999029946A1 (fr) * 1997-12-11 1999-06-17 Picanol N.V. Procede et dispositif pour controler l'insertion de fils de trame dans un metier mecanique
EP1136606A1 (fr) * 2000-03-20 2001-09-26 Lindauer Dornier Gesellschaft M.B.H Dispositif coupe-fil pour métiers à tisser
EP1498524A2 (fr) * 2003-07-17 2005-01-19 Promatech S.p.A. Dispositif à commande électrique pour programmer la coupe du fil de trame dans des métiers à tisser

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284766A1 (fr) * 1987-03-09 1988-10-05 Picanol N.V. Procédé pour couper un fil de trame inséré et dispositif de coupage
EP0347626A2 (fr) * 1988-06-20 1989-12-27 Mario Scavino Dispositif guide-fil du type levier commandé par un moteur linéaire pour des machines textiles
EP0679744A1 (fr) * 1994-04-29 1995-11-02 PANTER S.r.l. Dispositif coupe-trame pour métiers à tisser
EP0683256A1 (fr) * 1994-05-20 1995-11-22 NUOVO PIGNONE S.p.A. Dispositif coupe-fil pour métier à tisser à jet d'air

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284766A1 (fr) * 1987-03-09 1988-10-05 Picanol N.V. Procédé pour couper un fil de trame inséré et dispositif de coupage
EP0347626A2 (fr) * 1988-06-20 1989-12-27 Mario Scavino Dispositif guide-fil du type levier commandé par un moteur linéaire pour des machines textiles
EP0679744A1 (fr) * 1994-04-29 1995-11-02 PANTER S.r.l. Dispositif coupe-trame pour métiers à tisser
EP0683256A1 (fr) * 1994-05-20 1995-11-22 NUOVO PIGNONE S.p.A. Dispositif coupe-fil pour métier à tisser à jet d'air

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999029946A1 (fr) * 1997-12-11 1999-06-17 Picanol N.V. Procede et dispositif pour controler l'insertion de fils de trame dans un metier mecanique
EP1136606A1 (fr) * 2000-03-20 2001-09-26 Lindauer Dornier Gesellschaft M.B.H Dispositif coupe-fil pour métiers à tisser
EP1498524A2 (fr) * 2003-07-17 2005-01-19 Promatech S.p.A. Dispositif à commande électrique pour programmer la coupe du fil de trame dans des métiers à tisser
EP1498524A3 (fr) * 2003-07-17 2005-11-16 Promatech S.p.A. Dispositif à commande électrique pour programmer la coupe du fil de trame dans des métiers à tisser

Also Published As

Publication number Publication date
DE59606236D1 (de) 2001-01-25
EP0839938B1 (fr) 2000-12-20

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