For Positive Patents (Class 139/110)
  • Patent number: 9725834
    Abstract: Method for measuring the fabric tension in a weaving machine, in which the fabric (1) is deflected by a deflecting shaft (2), wherein a bending force is applied onto the deflecting shaft (2) by the fabric (1). The flexure or bending displacement of the deflecting shaft (2) is measured by a sensor (3), which is arranged in an area between two supports (4.1, 4.2) of the deflecting shaft (2) on the weaving machine. The deflecting shaft (2) is connected with a machine frame (9) of the weaving machine via the two supports (4.1, 4.2). The spacing distance (A) between the two supports (4.1, 4.2) of the deflecting shaft (2) is reduced for larger fabric tensions to be measured and is increased for smaller fabric tensions to be measured. Furthermore, the invention relates to a corresponding weaving machine.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: August 8, 2017
    Assignee: Lindauer DORNIER GmbH
    Inventor: Markus Gielen
  • Patent number: 8091589
    Abstract: A loom (1) has feed motor (27) rotating a warp beam (3) in a direction to feeding warps (V) from the warp beam (3), a heddles (10) opening and closing the warps (V) fed off from the warp beam (3), a reed (13) beating wefts (H) inserted into the openings of the warps (V) by a weft inserting device (11), a surface motor (61) rotating a surface roller (17) to pull in the woven fabric (W), which has been beaten by the reed (13) and formed of the warps (V) and the wefts (H), in the pulling direction, a position detector (35) detecting the tension of the warps (V), and a control device 25 having an adaptive filter unit (83) filtering the tension detected by the position detector (35), and controlling the feed motor (27) and the surface motor (61) on the basis of the tension filtered by that adaptive filter unit (83) so that the tension of the warps (V) to a predetermined target tension.
    Type: Grant
    Filed: September 1, 2008
    Date of Patent: January 10, 2012
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventor: Narutoshi Yokokawa
  • Publication number: 20110000576
    Abstract: A loom (1) has feed motor (27) rotating a warp beam (3) in a direction to feeding warps (V) from the warp beam (3), a heddles (10) opening and closing the warps (V) fed off from the warp beam (3), a reed (13) beating wefts (H) inserted into the openings of the warps (V) by a weft inserting device (11), a surface motor (61) rotating a surface roller (17) to pull in the woven fabric (W), which has been beaten by the reed (13) and formed of the warps (V) and the wefts (H), in the pulling direction, a position detector (35) detecting the tension of the warps (V), and a control device 25 having an adaptive filter unit (83) filtering the tension detected by the position detector (35), and controlling the feed motor (27) and the surface motor (61) on the basis of the tension filtered by that adaptive filter unit (83) so that the tension of the warps (V) to a predetermined target tension.
    Type: Application
    Filed: September 1, 2008
    Publication date: January 6, 2011
    Inventor: Narutoshi Yokokawa
  • Publication number: 20100032049
    Abstract: The present invention has an object of providing a method for producing a carbon fiber woven fabric in which the length of each warp yarn made of a carbon fiber strand is uniform, weft yarns are straightly arranged without waviness, and that is excellent in quality can be obtained with high productivity (production speed), and is characterized that a method for producing a carbon fiber woven fabric using an air jet loom in which heald in a shedding motion has an angle of repose in a range of 0 to 50° when weaving a uni-directional carbon fiber woven fabric woven with a carbon fiber strand having a fineness of 400 to 6,000 tex as the warp yarn and an auxiliary fiber having a fineness of ? or less of the carbon fiber strand as the weft yarn.
    Type: Application
    Filed: April 27, 2007
    Publication date: February 11, 2010
    Applicant: Toray Industries, Inc.
    Inventors: Eisuke Wadahara, Ikuo Horibe, Shigeru Miyamoto, Kenichi Takezawa, Kuniyoshi Kurihara, Kazuhiro Ohno
  • Patent number: 7320343
    Abstract: The invention relates to a loom comprising a warp thread tensioning device and a shedding device (12), which comprises pre-tensioned warp threads (4) in a first shedding position (F1). The loom also comprises a lifting device (38), which can be driven in an oscillating manner, and followers (40) for the warp threads (4), in addition to control means (46) that can be operated by actuators (44) in order to selectively engage the warp threads (4) in the followers (40) and that displace the warp threads (4) into a second shedding position (F3). To simplify said loom, a second lifting device (48), which is common to all warp threads (4), is provided in order to displace said warp threads (4) from the first shedding position (F1) into a selection position (F2), in which the first lifting device (38) is active, and in order to displace non-selected warp threads in unison into the first shedding position (F1) by the pre-tensioning of said warp threads (4).
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: January 22, 2008
    Assignee: Textilma AG
    Inventor: Francisco Speich
  • Patent number: 6918410
    Abstract: A method for weaving single-layered and/or multi-layered woven fabric, especially airbag fabric, includes interweaving warp threads delivered by at least two warp beams.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: July 19, 2005
    Assignee: Berger Seiba-Technotex Verwaltungs GmbH & Co.
    Inventor: Johann Berger
  • Patent number: 6725884
    Abstract: A yarn tightening element for a weaving machine, comprising a passage (16) for a yarn (15) and a contact means (2) to transmit a tightening force to a yarn (15) moving along through this passage, the passage (16) being not bordered on at least one side of the plane of movement of the yarn (15) or comprises a boundary (14) that is interrupted across its width, so that a part of the yarn (15) running through from that side of the plane of movement, via the interruption (17), can be made to co-operate with the contact means (2). Said boundary is, for instance, formed by one or more fingers (14) directed downwards, while said interruption (17) of this boundary (14) is formed between the extremities of each finger (14) and a part (8) of the yarn tightening element. Such a yarn tightening element can be placed on a yarn very easily and quickly by means of a hooking on movement and be removed again by means of an equally simple hooking off movement.
    Type: Grant
    Filed: April 3, 2002
    Date of Patent: April 27, 2004
    Assignee: N.V. Michel Van de Wiele
    Inventor: Erik Vermeulen
  • Publication number: 20030066569
    Abstract: In a loom with a mechanical weft insertion the motion of each individual warp thread on its way from an uppermost position to a lowermost position and vice verse is controlled individually by a jacquard in such a way, that the motion profile includes a shed stopping in a weft entrance section and simultaneously in a weft exit section of a weaving width of the loom. Shed stopping is avoided at least in the center of the warp shed, namely in an intermediate section between the weft entrance and exit sections of the weaving width of a loom thereby providing sufficient time for the rapiers or grippers to be withdrawn from the shed without damaging the warp threads.
    Type: Application
    Filed: October 9, 2002
    Publication date: April 10, 2003
    Applicant: Lindauer DORNIER Gesellschaft mbH
    Inventor: Adnan Wahhoud
  • Patent number: 6230757
    Abstract: An apparatus for tensioning warp threads in a weaving machine having a rotatably mounted carrier beam (5) which exerts strain on a tensioning roll (10) acting on the warp threads (15). A pre-stressed torsion spring (16) is arranged inside the carrier beam (5) and via its torque, presses the tensioning roll (10) against the warp threads (15). The apparatus can sense the torsional moments of the torsion spring (16).
    Type: Grant
    Filed: March 15, 2000
    Date of Patent: May 15, 2001
    Assignee: Picanol N.V.
    Inventor: Bart Lefever
  • Patent number: 6216747
    Abstract: A beam let-off apparatus capable of adjusting the tension of a plurality of filaments as they are removed from a beam through the controlled movement of a pivoting arm directed by the tension of the unwinding filaments, comprises a frame, a driven roll, 1-3 idler rolls on the frame and a dancer roll mounted on pivoting arms mounted on the frame wherein the filaments pass under and around the dancer roll through a defined wrap angle is provided.
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: April 17, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: John Stevens Rutter Lawrence
  • Patent number: 6135162
    Abstract: In a loom of which the backrest (3) and/or the warp stop motion (17) are adjustably supported on the machine frame (22) and are adjustable by associated adjusting equipment with at least one adjusting function, at least the backrest (3) and/or the warp stop motion (17) are automatically adjusted. To achieve this, at least one controllable driven adjusting device (30) connected to the loom control is allocated to the adjusting equipment. The existing actual position of the backrest and/or of the warp stop motion is determined. At least the measured values characteristic of the actual position are compared to prescribed nominal or desired values. From this comparison, an adjusting signal is generated, which is then provided to the adjusting device, which then automatically moves the backrest (3) and/or the warp stop motion (17) automatically into the respective desired position.
    Type: Grant
    Filed: May 13, 1999
    Date of Patent: October 24, 2000
    Assignee: Lindauer Dornier Gesellschaft mbH
    Inventors: Peter D. Dornier, Herbert Mueller, Stefan Arndt
  • Patent number: 6098670
    Abstract: An apparatus for applying substantially uniform tension to warp threads along a warp thread path in a weaving machine. The apparatus has a carrier element (5), a tensioner element (7) for the warp threads which is multiply supported thereon, said tensioner element being pivotal about the axis of the carrier element, and a drive apparatus (8) which is connected drivewise to the carrier element. The drive apparatus (8) consists of a motor (9) and a kinematic chain which is connected to the carrier element (5) in such a manner that the introduction of the forces into the carrier element takes place substantially symmetrically with respect to its longitudinal extent.
    Type: Grant
    Filed: February 17, 1999
    Date of Patent: August 8, 2000
    Assignee: Sulzer Ruti Ag
    Inventor: Heinz Baumann
  • Patent number: 6070619
    Abstract: A method of controlling the easing motion (1) of a loom executes a position control operation and a tension control operation successively in one weaving cycle of the loom. The position of an easing roller (6) included in the easing motion (1) is measured in a position control period, a correction is determined according to the deviation of the measured position of the easing roller (6) from a desired roller position, and a controlled variable is corrected by using the correction to make the actual position of the easing roller (6) approach the desired roller position.
    Type: Grant
    Filed: May 10, 1999
    Date of Patent: June 6, 2000
    Assignee: Tsudakoma Kogyo Kabushiki Kaisha
    Inventors: Zenji Tamura, Kenjiro Ohno
  • Patent number: 6023949
    Abstract: A circular machine for knitting or hosiery with a device for tensioning the knitted fabric, the tensioning device comprising at least two tensioning rollers which are arranged below the needle work area and are arranged substantially horizontally. The tensioning rollers face each other and actuation elements are provided which act on at least one of the tensioning rollers to turn it about the corresponding axis in order to tension the knitted fabric which is formed by the needles and passes between the tensioning rollers. The tensioning device comprises first detection elements for detecting the degree of tension of the fabric in a region of the portion of fabric that lies between the needle work area and the tensioning rollers. The first detection device is operatively connected to the first actuation element in order to vary or maintain the rotation rate of the tensioning rollers as a function of the detected tension degree tension and of a preset tension degree.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: February 15, 2000
    Assignee: Santoni S.p.A.
    Inventors: Francesco Lonati, Ettore Lonati, Fausto Lonati, Tiberio Lonati
  • Patent number: 5890519
    Abstract: An apparatus for controlling a warp tensioner of a weaving machine. The apparatus contains a spring member that is in working connection with the warp tensioner and a control system that has a container communicating via a 2/2 way valve with the spring member in order to vary the spring stiffness of the spring member and the position of the warp tensioner from a terminal at the side where the weaver stands by increasing and decreasing the effective volume of the spring member.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: April 6, 1999
    Assignee: Sulzer Rueti AG
    Inventors: Godert De Jager, Frank Lehnert
  • Patent number: 5862835
    Abstract: A drive device for a weaving machine has a motor control unit connected to an asynchronous motor. An electric supply network supplies the motor control unit with electric power which the motor control unit converts to have a substantially higher frequency. This higher frequency power is then supplied to the asynchronous motor causing the motor to operate at a high r.p.m. A speed reducing unit is connected between the motor and a drive shaft of the weaving machine. The speed reducing unit reduces the r.p.m. of the motor and the motor drives the weaving machine via the drive shaft at the r.p.m. of the weaving machine.
    Type: Grant
    Filed: September 16, 1996
    Date of Patent: January 26, 1999
    Assignee: IRO AB
    Inventor: Jerker Hellstrom
  • Patent number: 5857496
    Abstract: Weaving apparatus comprises a warp beam bearing warp threads, a loom on which the warp threads are woven with weft threads, and a take-up roller for taking up the woven material. The loom is powered by a main loom motor. Either or both of the take-up roller and the warp beam are controlled by switched reluctance motors. The switched reluctance motor is able to maintain correct tension in the warp threads or the woven material without generating excessive heat in maintaining a desired position.
    Type: Grant
    Filed: April 18, 1997
    Date of Patent: January 12, 1999
    Assignee: Switched Reluctance Drives Limited
    Inventors: Geoffrey T. Brown, Michael J. Turner
  • Patent number: 5787938
    Abstract: A device for drawing-off a fabric in a circular loom where the circular loom has a drive motor for driving a main shaft and a weft monitoring assembly for detecting a fault in a weft. The device has a separate motor for driving the fabric draw-off rollers, a computer that controls the rotational speed of the separate motor through a speed regulating device, and a pulse generator that generates control pulses proportional to the rotational speed of the main shaft. In the event of a fault in the weft detected by the weft monitoring assembly, the computer readjusts the rotational speed of the separate motor.
    Type: Grant
    Filed: April 17, 1997
    Date of Patent: August 4, 1998
    Assignee: Starlinger & Co., Gesellschaft MBH
    Inventor: Franz Starlinger Huemer
  • Patent number: 5743307
    Abstract: A system for bringing ground warp threads under tension on a beam stand comprises first and second rollers on which the ground warp threads run. The first roller is mounted on a support which is movable in relation to the second roller. A mechanism for exerting force on the support is provided whereby the ground warp threads on the beam stand are brought under tension. The mechanism includes a hydraulic element that is connected to a hydraulic pressure vessel by a pipe provided with an apparatus for controlling or regulating the hydraulic fluid.
    Type: Grant
    Filed: October 17, 1996
    Date of Patent: April 28, 1998
    Assignee: Michel Van De Wiele N.V.
    Inventors: Carlos Derudder, Joseph Verschelde
  • Patent number: 5699837
    Abstract: In a double-gripper weaving machine, intended for weaving plain velvet and carpets, a pile feeder and a combined pile warp beam let-off motion are equipped with a computer in order to calculate the necessary pile warp feed of each operating cycle of the weaving machine and use said calculation as a reference value, both functions pile feeder and pile warp beam let-off motion, being performed directly. The pile warp beam let-off motion has a regulating system consisting of a multi-axis control system provided for one or more pile warp beams.
    Type: Grant
    Filed: May 9, 1996
    Date of Patent: December 23, 1997
    Assignee: N.V. Michel Van De Wiele
    Inventor: Hans Desmet
  • Patent number: 5649569
    Abstract: A warp tension measuring apparatus for weaving machines or looms has a force sensor or pick-up (3) and a member (2) which is in active communication with the force sensor (3) to transfer a force acting on the members (2) onto the force sensor. The force sensor (3) is provided with a resilient element (9) to improve the introduction of force, on the one hand, and to damp mechanical oscillations, on the other hand.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: July 22, 1997
    Assignee: Sulzer Rueti AG
    Inventors: Godert De Jager, Lorant Gacsay
  • Patent number: 5645111
    Abstract: In a weaving machine a control unit for controlling the movement of the shaft frames or harnesses creates a feedback function through load cells and AC-servo motors that enables accurate shaft frame adjustment in forming an open shed. The weaving machine includes detecting mechanisms that detect parameters regarding condition the shaft frames. An individual control unit controls each of the shaft frames. The control units adjust the shaft frames in one or more positions to create open and closed sheds in the warp threads to enable the weft threads to be inserted by the shuttles as the warp threads change position. The control units receive feedback data of at least one of the parameters from the detecting mechanisms, such that operation of the control units incorporates the feedback data. Control systems control the control units to create a substantially constant level in the butting edge of the fabric irrespective of the positions of the shaft frames.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: July 8, 1997
    Assignee: Texo AB
    Inventor: Bo Lindblom
  • Patent number: 5628346
    Abstract: A device for measuring the warp yarn tension of a woven fabric in a loom, which includes a fixed deviation bar which extends across the entire loom width and cooperates with a device measuring warp yarn tension, the fixed deviation bar having a central or intermediate portion for the fabric under formation, the intermediate portion being of a length less than that of a minimum formable fabric width and being detached from the remaining sections of the bar by thin breaks in the deviation bar. The intermediate portion is supported via at least one load cell. The device is located in the loom to measure the tension of the fabric already woven and prior to its being wound on the winding beam.
    Type: Grant
    Filed: February 9, 1995
    Date of Patent: May 13, 1997
    Assignee: Nuovo Pignone S.p.A.
    Inventors: Luciano Corain, Marco Novella, Roberto Spanevello
  • Patent number: 5538048
    Abstract: A system and method for regulating the cloth fell position in a loom. The desired lengths of cloth and warp thread are determined by averaging the actual values over a given number of weft insertions. The actual lengths of the cloth and warp thread are then continuously measured and compared with the desired values during weaving to compute warp and cloth offset values. A correction factor is determined based on the offset values and the moduli of elasticity of the warp thread and cloth. The cloth fell position is then corrected by adjusting either the actual length of the cloth or the warp thread based on the correction factor.
    Type: Grant
    Filed: March 23, 1995
    Date of Patent: July 23, 1996
    Assignee: Sulzer R uti AG
    Inventor: Godert De Jager
  • Patent number: 5487413
    Abstract: A loom is slowly operated in reverse rotation to move the loom to a position where a cutter is able to easily cut an improper weft when there occurs an error in the picking motion. Then, the loom is operated in normal rotation to move it to a position where the improper weft remaining in the shedding motion can be easily removed. A pick finding device is then operated to temporarily separate a main shaft and the shedding motion, and a harness frame is reversely rotated for A new weft is then inserted after the improper weft is removed from the shedding motion. In the course of the operation, a cloth fell is held at a fixed position to protect the cloth fell from being beaten by a reed. The take-up motion is then operated in normal rotation, and at the same time the let-off motion is rotated in the reverse direction at a fixed rotational ratio to provide a warp with proper tension.
    Type: Grant
    Filed: October 18, 1994
    Date of Patent: January 30, 1996
    Assignee: Kabushiki Kaisha Ishikawa Seisakusho, Ltd.
    Inventors: Kunio Hatakeyama, Yoshihiko Habu
  • Patent number: 5386855
    Abstract: A device for automatically varying, during the transient states following loom stoppages, the shed vertex position in the loom. The device consists of a sensor for determining the beat-up pulse intensity of the loom reed. The device also is connected to a comparator which receives a predetermined set value corresponding to the beat-up pulse intensity of the reed during normal operation. The output of the comparator is used, through a control unit, to synchronously drive the electric motors that operate the beam and the take-up roller of the loom, respectively.
    Type: Grant
    Filed: October 14, 1993
    Date of Patent: February 7, 1995
    Assignee: Nuovopignone-Industrie Meccaniche E Fonderia SpA
    Inventors: Luciano Corain, Spanevello Roberto, Marco Novella
  • Patent number: 5355912
    Abstract: A device for automatically controlling the warp yarn tension in a loom in which the fixed deviation bar for the fabric under formation is supported only at its ends. A deformation sensor, moreover, is directly supported on the deviation bar. The deformation sensor is electrically connected to a comparator to which an adjustable set-value unit is also connected, the output of the comparator being used to drive the geared motor of the warp yarn feed beam to control the warp yarn tension.
    Type: Grant
    Filed: September 27, 1993
    Date of Patent: October 18, 1994
    Assignee: Nuovopignone-Industrie Meccaniche e Fonderia SpA
    Inventors: Luciano Corain, Roberto Spanevello, Marco Novella
  • Patent number: 5305802
    Abstract: The weaving machine has at least two sectional warp beams (20a, 20b) and at least one whip roll (23) rotatably mounted to the machine. Each sectional warp beam is equipped with an individually drivable warp let-off motion (30, 31, 32). Feeler members (13a, 13b) are mounted symmetrically on a rocker-like bar (10) to measure the warp yarn tension and control devices individually control the speed of rotation of the sectional warp beams. The rotational axis (11) of the bar (10) is parallel to the warp plane and is situated between the sectional warp beams. A sensor (14a) determines the deviation of the bar alignment from a reference position, so that it is possible to effect warp let-off control.
    Type: Grant
    Filed: March 16, 1993
    Date of Patent: April 26, 1994
    Assignee: Gebrueder Sulzer Aktiengesellschaft
    Inventor: Lutz Fehrenbach
  • Patent number: 5259421
    Abstract: Apparatus for feeding warp yarns to a weaving machine has a driven yarn tensioning roll (A) over which passes the warp yarn as it is pulled from a supply into the weaving machine. Thereafter, the warp yarn passes over a dancer roll (B) and a guide (C). A motor (D) drives the roll (A) for rotation responsive to oscillation of the dancer roll (B) resulting from yarn tension. Power operated apparatus (E) including fluid operated cylinders move the dancer roll and guide away from the yarn tensioning roll (A) to permit quick thread up of the weaving machine. By providing a second driven yarn tensioning roll and associated elements it is possible to more effectively mix warp yarns being fed into the weaving machine. A potentiometer (F) is driven by oscillation of the dancer roll for controlling the speed of the motor (D).
    Type: Grant
    Filed: October 27, 1992
    Date of Patent: November 9, 1993
    Assignee: Alexander Machinery, Inc.
    Inventors: William J. Alexander, III, Shala W. Summey, III
  • Patent number: 5224520
    Abstract: Upon slow operation of a loom, a feed-out motor for a warp beam or a wind-up motor for a surface roller is driven to thereby displace a cloth fell of woven fabric from a normal position toward the fabric, and upon completion of the slow operation, the motor is driven reversely to allow the cloth fell to ressume the normal position. The cloth fell is thereby prevented from being beaten by a reed while protecting woven fabric from generation of weaving bar. Suppression of the weaving bar can also be realized by varying warp tension or a one-shot weft insertion performed from a main weft inserting nozzle while causing auxiliary nozzles to previously produce jets simultaneously or in relays.
    Type: Grant
    Filed: November 8, 1991
    Date of Patent: July 6, 1993
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Masami Shinbara, Fumio Yasuoka
  • Patent number: 5170821
    Abstract: A warp tension control apparatus includes a tension detector for detecting the tension of a warp and an operation mode controller for generating a control signal to drive a motor so as to minimize the deviation between the detected tension and a normal target tension. A long period stop mode controller is included for controlling the tension so that a target slack tension is set to be less than the normal target tension when a loom stop signal has been issued. A selector switch is provided for selectively switching to a contact connected to an output of the long period stop mode controller before entering a long unmanned operating period of the loom, the switch being disposed in a circuit between an input terminal of the long period stop mode controller which receives a loom stop signal and a warp tension slack device.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: December 15, 1992
    Assignee: Tsudakoma Corp.
    Inventor: Toshio Yoshida
  • Patent number: 5090452
    Abstract: In order to prevent the formation of weft streaks in cloth when a loom is restarted after a stoppage, the warp tension is reduced by a predetermined amount as soon as the stoppage occurs and the original warp tension is restored before restarting. The reduction in the warp tension prevents the tensile failure, that is, the plastic extension of the warp yarn, and ensures the exact repositioning of the beating-up line of the weft upon restarting.
    Type: Grant
    Filed: March 21, 1990
    Date of Patent: February 25, 1992
    Assignee: Ergotron S.a.s. di Dondi Benelli Dore & C.
    Inventor: Dore Dondi Benelli
  • Patent number: 5065796
    Abstract: An apparatus for controlling an air jet loom and, in particular, for controlling a loom used for weaving cloth having move than one pick range. One use of such cloth is for tire-cord fabric having a body portion having between 1 and 3.5 ppi and at least one tab portion having between 3.5 and 50 ppi. The system includes an automatic temple insertion device. The system further includes dual nozzles to automatically switches from tab to body; automatic pick spacing change from tab to body; and an automatic tension level control. The system permits multiple tabs on a roll for separating multiple body portions of the roll, providing an inspection segment per roll, and providing a cut line either by "no picks" or by changing the filling within the tab.
    Type: Grant
    Filed: October 2, 1990
    Date of Patent: November 19, 1991
    Assignee: Draper Corporation
    Inventors: Ernest F. Roach, Stephen D. Frick, Randell F. Sample
  • Patent number: 5029616
    Abstract: A method of weaving cloth having a weaving pattern which varies according to which warp threads are supplied and according to which weft threads are bound into the warp threads, includes the steps of forming successive different pattern areas and regulating the warp tension according to a reference value during weaving such that its variation is a function of the different pattern areas to be formed. Control of the reference value is accomplished by determining a reference value for the warp tension as a function of the weaving pattern, and regulating the warp tension by measuring the actual warp tension, comparing the measured warp tension with the reference value, and controlling the motor of the let-off such that the difference between the reference value and the measured warp tension is regulated to zero. A weaving machine is arranged to carry out each of the above method steps.
    Type: Grant
    Filed: January 26, 1990
    Date of Patent: July 9, 1991
    Assignee: Picanol N.V.
    Inventor: Filip Deconnick
  • Patent number: 5024253
    Abstract: A take-up rate and a let-off rate in warp feed on a loom are controlled while a displacement (.DELTA.L) of a cloth fell position C is taken into account. The system comprises a cloth fell position compensation circuit (2, 16, 21) which outputs a cloth fell compensation signal ( to compenate a displacement (.DELTA.L) of the cloth fell position (C) when a weaving condition such as a target weft density (D*), a target warp tension (T*) or the kinds of weft and warp yarns is changed. The cloth fell compensation signal is added to a basic warp feed rate (.omega..sub.f) obtained from D*, so that the displacement motion of the cloth fell is completed in a shorter time. According to this compensation, a weft density of a resultant fabric rapidly coincides with the target weft density.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: June 18, 1991
    Assignees: Kabushiki Kaisha Toyota Chuo Kenkyusho, Kabushiki Kaisha Toyoda Jidoshokki
    Inventors: Susumu Kawabata, Kazunori Yoshida, Yoshikatsu Kisanuki, Hajime Suzuki, Masao Shiraki
  • Patent number: 4949759
    Abstract: A seersucker loom is arranged such that puckering warp yarns are divided to form a shed during the weaving of a seersucker. The tension of the puckering warp yarns is maintained on a level below that of the tension of the ground warp yarns. The puckering warp yarns are slackened positively at least during a slackening period from a shed closing operation to a beating-up operating of every turn of the main shaft of the seersucker loom so that the tension of the puckering warp yarns are reduced to a value which below a predetermined tension of the yarns during a period other than during the slackening period. This enables the loom to slacken portions of the puckering warp yarns near the cloth fell sufficiently during the beating-up operation so that the puckering warp yarns are satisfactorily puckered.
    Type: Grant
    Filed: July 26, 1989
    Date of Patent: August 21, 1990
    Assignee: Tsudakowa Corp.
    Inventors: Yujiro Takegawa, Kenjiro Ohno, Fumio Matsuda, Zenji Tamura
  • Patent number: 4942908
    Abstract: A warp transfer control system for a loom, includes a first actuator for varying a warp let-off speed, a second actuator for varying a fabric take-up speed to change a filling density, and a control unit which has a take-up control section for controlling the second actuator, a feedback control section for controlling the let-off speed through the first actuator when no change is required in the filling density, and a feedforward control section for changing the let-off speed so as to improve an appearance quality of a fabric when the density is changed. When a change from a first filling density to a second density is required, the feedforward section first changes the let-off speed excessively from a first let-off speed corresponding to the first density beyond a second let-off speed corresponding to the second density, and holds the let-off speed at such an excessive level for a limited duration.
    Type: Grant
    Filed: March 29, 1989
    Date of Patent: July 24, 1990
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Shuichiro Imamura
  • Patent number: 4827985
    Abstract: A warp tension control method by which the let-off motion of a loom is controlled to regulate the tension of the warp yarns. A force of the same dimension as the controlled variable, namely, the tension of the warp yarns, is applied to a mechanism supporting the tension roller of the let-off motion for displacement under the control of an electric control system to control the warp tension at a high accuracy.
    Type: Grant
    Filed: December 3, 1987
    Date of Patent: May 9, 1989
    Assignee: Tsudakoma Corp.
    Inventors: Katsuhiko Sugita, Akihiko Nakada, Tsutomu Sainen
  • Patent number: 4817677
    Abstract: Method for controlling the warp let-off on weaving machines, with the characteristic that the method consists of: detecting the variation with time of at least one of the parameters which are a function of the warp tension and speed of motion of the warp threads; taking the detected signal and removing the effects due to variations in the weave pattern; and using the resulting cleaned signal to control at least one warp drive motor.
    Type: Grant
    Filed: August 21, 1987
    Date of Patent: April 4, 1989
    Assignee: Picanol N.V.
    Inventors: Filip Deconinck, Johan Cappelaere, Michel Vandeweghe
  • Patent number: 4750527
    Abstract: In a control for a warp beam drive of a weaving machine, the warp beam drive is regulated at all times by a control which receives input signals representing the number of rotations of the warp beam and representing the tension of the warp threads. If the weaving machine has come to a standstill because of an error which has taken place, then, before the warp beam drive is re-started, the tension on the warp threads is increased to a specific value by rotating the warp beam in reverse, in order, during re-start, to take warp thread tension back to a predetermined normal value again through suitable action on the warp beam drive. The effect of this is that no stop marks or start marks are formed in the woven material as a result of the weaving machine having stood still.
    Type: Grant
    Filed: August 7, 1986
    Date of Patent: June 14, 1988
    Assignee: Maschinenfabrik Stromag GmbH
    Inventor: Walter Rehling
  • Patent number: 4736776
    Abstract: During the weaving process, the location and displacement of the cloth line and/or the breast beam are continuously detected; the detected value is supplied to a drive unit; in the event of a variation in cloth line location with respect to the desired location, the breast beam is moved by means of a drive unit such that the cloth line is returned to the desired location, or in other words, the cloth line is automatically maintained and/or returned almost to the desired location by means of the breast beam.
    Type: Grant
    Filed: July 10, 1986
    Date of Patent: April 12, 1988
    Assignee: Picanol N.V.
    Inventors: Michel Vandeweghe, Andre Delanghe, Marcel Vandecandelaere, Henry Shaw, Johan Pannekoucke, Gabriel Thore, Eberhard Huettl, Valere Vermeersch, Roger Lampaert
  • Patent number: 4722368
    Abstract: Unwinding device for twin warp beams, with two separate unwinders, wherein the adjustment of the two unwinders (3, 4) is carried out according to the inclinations, detected by sensors (23, 24), which the two yarn carriers (5, 6) of the beams (1, 2) take up under the different tensions of the warp yarns (f).
    Type: Grant
    Filed: May 23, 1986
    Date of Patent: February 2, 1988
    Assignee: Vamatex S.p.A.
    Inventor: Luigi Pezzoli
  • Patent number: 4690176
    Abstract: In a back rest arrangement on a weaving machine the back rest is preferably carried at each of its ends by one arm of a two-armed support frame or yoke which is pivotable about a stationary pivot axis on a machine frame. At least one of the arms of the support frame or yoke possesses a resilient portion or shank. A free end of the resilient shank is supported in a manner which is relatively rigid in relation to a pivoting motion of the support frame or yoke caused by the varying warp force acting on the back rest. The resilient shank is in operative association with a sensing probe for generating an electrical signal which is proportional to the deflection of the resilient shank. These measures render the arrangement suitable both for a so-called rigid or fixed back rest support as well as for a back rest support utilizing a rocking lever or rocker beam.
    Type: Grant
    Filed: February 10, 1986
    Date of Patent: September 1, 1987
    Assignee: Aktiengesellschaft Adolph Saurer
    Inventors: Theo Thalmann, Gerhard Oesterle
  • Patent number: 4585037
    Abstract: A method of regulating the tension of warp yarns in a weaving machine is disclosed herein. In a preferred embodiment of the invention, variation in warp yarn tension is detected by a tension roller which is movable with a change in the tension. The speed at which a warp beam is rotated is controlled in dependence upon the manner of the tension roller movement in such a way that its unwinding rotation during normal weaving operation of the machine is speeded up with an increase in the warp yarn tension and slowed down with a decrease therein, and also that its rewinding rotation during reversing operation of the machine is decelerated with an increase in the warp yarn tension and accelerated with a decrease in the tension.
    Type: Grant
    Filed: November 21, 1983
    Date of Patent: April 29, 1986
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventor: Masahiko Kimbara
  • Patent number: 4572244
    Abstract: A loom having left and right warp beams and a common tension roller is provided with an electric or mechanical control system, which detects forces exerted on left and right supports of the tension roller by the warp threads of both warp beams, and produces a left control signal corresponding to a tension of the warp threads of the left warp beam and a right control signal corresponding to a tension of the warp threads of the right warp beam in accordance with the detected forces. The rotational speeds of the left and right warp beams are controlled individually in accordance with the left and right control signals, respectively.
    Type: Grant
    Filed: August 28, 1984
    Date of Patent: February 25, 1986
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Shuichi Kojima, Masashi Nakao, Miyuki Gotoh, Takao Ishido, Shuichiro Imamura
  • Patent number: 4564050
    Abstract: A method for starting the operation of a loom always under a constant warp tension after the completion of the amendment of faults in the woven fabric such as miss-pick. A warp beam in the stationary loom is rotated by a commmand signal from a control unit in the normal or reverse direction so that the preset tension can be attained. As a result, a weaving bar which often occurs in the prior art just after the loom has restarted due to disturbance of gear ratio of the speed changer during the transient state can be avoided.
    Type: Grant
    Filed: February 23, 1984
    Date of Patent: January 14, 1986
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventor: Hideo Hirano
  • Patent number: 4554951
    Abstract: A method of regulating the tension of warp yarns in a weaving machine is disclosed herein. Displacement of a tension roller, which is movable with a change in warp yarn tension, from a reference position corresponding to an optimum tension of the warp yarns in the weaving machine is detected by a sensor, which then converts such mechanical displacement of the tension roller into electrical signals proportional to the amount of said displacement. The signals are sampled successively in synchronism with the operation of the weaving machine. Adjustment of the speed at which a warp beam is rotated is made depending upon the data from sampled signals in such a way that the speed is decreased when the tension is dropped beyond the lower limit of a predetermined range, while it is increased when the tension is built up to exceed the upper limit thereof.
    Type: Grant
    Filed: November 10, 1983
    Date of Patent: November 26, 1985
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Hideo Hirano, Masahiko Kimbara
  • Patent number: 4552186
    Abstract: A warp let-off mechanism of a weaving machine has a speed change transmission whose output rotation is in one direction irrespective of whether its input rotation is in the forward or reverse direction. The speed change transmission has shift means for selectively changing the direction of the output rotation between the forward and reverse directions. The speed change transmission can change the ratio between the input speed and output speed in accordance with warp tension sensed by warp tension sensing means. There is further provided interlock means connected between the shift means of the speed change transmission and an operating lever or other operating device of the weaving machine. The interlock means moves the shift means in accordance with the movement of the operating lever so as to match the direction of the warp beam rotation to the operation of the weaving machine.
    Type: Grant
    Filed: November 30, 1983
    Date of Patent: November 12, 1985
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Shuichi Kojima
  • Patent number: 4546801
    Abstract: The control device contains a deflection roll extending over the entire weaving width of the weaving machine, a tensioning beam pivotable about a support beam and also extending over the entire weaving width as well as a sensing roller arranged therebetween and subject to the action of a spring for sensing a portion of the warp threads of the warp, respectively of each partial warp beam. The tensioning beam is subject to the action of a preloaded torsion-bar spring. In this manner a sensing force arises at the sensing roller which can be increased from a first value to a second value according to the position of the tensioning beam. This permits the realization of increased responsiveness of the control device.
    Type: Grant
    Filed: September 14, 1984
    Date of Patent: October 15, 1985
    Assignee: Maschinenfabrik Sulzer-Ruti AG
    Inventors: Robert Bucher, Walter Kung
  • Patent number: 4537226
    Abstract: A weaving machine has a first drive means which has a speed change transmission and drives a warp beam during normal weaving operation, and a second drive means for driving the warp beam independently of the first drive means when the weaving machine is moved by inching or by hand during downtime operation. A first sensor senses the weaving cycle of the weaving machine, and a second sensor senses the warp beam rotation. A warp beam rotation control system determines the angular displacement of the warp beam per weaving cycle during normal weaving operation, and controls the warp beam rotation during downtime operation in accordance with the determined angular displacement per weaving cycle.
    Type: Grant
    Filed: September 21, 1983
    Date of Patent: August 27, 1985
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Miyuki Gotoh