EP3414378A1 - Yarn feeder with electrically settable yarn brake - Google Patents
Yarn feeder with electrically settable yarn brakeInfo
- Publication number
- EP3414378A1 EP3414378A1 EP17750510.4A EP17750510A EP3414378A1 EP 3414378 A1 EP3414378 A1 EP 3414378A1 EP 17750510 A EP17750510 A EP 17750510A EP 3414378 A1 EP3414378 A1 EP 3414378A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- yarn
- reference position
- braking element
- braking
- yarn feeder
- 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
Links
- 230000009975 flexible effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 8
- 239000004753 textile Substances 0.000 description 10
- 238000009941 weaving Methods 0.000 description 6
- 238000009940 knitting Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Classifications
-
- 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
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
- D03D47/36—Measuring and cutting the weft
- D03D47/361—Drum-type weft feeding devices
- D03D47/364—Yarn braking means acting on the drum
- D03D47/366—Conical
-
- 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
- B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
- B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
-
- 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
Definitions
- the present disclosure relates to a yarn feeder.
- the present disclosure relates to control of a brake element in a yarn feeder for textile machines to electronically regulate the tension of the yarn taken from the feeder.
- Yarn feeders are used to eliminate yarn tension variations to ensure high quality and also to supply the correct amount of yarn to a textile machine, e.g. a shuttleless weaving machine or knitting machine. Hereby textile quality and productivity of the textile machine can be increased.
- One feature of a yarn feeder is to provide a suitable yarn tension for the yarn fed to a weaving machine, e.g. a rapier weaving machine.
- the yarn tension applied can be provided in different manners.
- a frustum-conical braking element can be used that cooperates with the spool body rim to create an essentially constant braking force, see EP 0 534 263.
- the force that the braking element exercises can alternatively be controlled by an electro-magnetic actuator to continuously vary over time to take into account desirable variations in the required braking force as is for example described in EP 0 652 312.
- the braking force applied can be controlled by an electric motor, such as a step motor, see EP 0 707 102. It is further possible to use a yarn tension sensor to keep the braking force desirably constant alternatively desirably varying over time.
- the electrically settable brake has at least one known reference value that can be used as a reference position for a device used to control the braking force.
- a reference position for an electrically settable yarn brake is provided.
- the use of a reference position makes it possible to remotely set the braking force without having to use a downstream yarn tension sensor.
- the system and method used to obtain said reference position for an electrical settable yarn brake is configured to be used during start up of a system for a textile machine, having a downstream yarn tension sensor, in which system there can be a need to determine a start value for the setting of the yarn tension, before any feedback information from the yarn tension sensor is received.
- a yarn feeder comprising a yarn braking element cooperating in a flexible manner with a spool body of the yarn feeder.
- the yarn braking element will provide a braking force acting on a yarn withdrawn from the spool body, when forced against the spool body.
- the braking force is controllable by an electrically driven motor or an actuator for driving the yarn braking element towards respectively from the spool body.
- the yarn feeder further comprises means, such as a reference position determinator, adapted to determine a reference position of the yarn braking element where the yarn braking element reaches contact with the spool body.
- an input device for receiving a manual input signal representing the reference position when the yarn braking element reaches contact with the spool body, as determined by an operator, is provided.
- the means adapted to determine a reference position of the yarn braking element is a distance/position sensor adapted to automatically detect when said reference position is reached.
- the means adapted to determine a reference position of the yarn braking element is a sensor adapted to detect a drive current increase of the motor or actuator, occurring when said reference position is reached.
- the means adapted to determine a reference position of the yarn braking element is a sensor adapted to detect a deformation of the brake element or an element attached to the brake element, occurring when said reference position is reached.
- a memory for storing the reference position is provided in the yarn feeder.
- a memory for storing the reference position is provided in a unit remote from the yarn feeder.
- the yarn feeder comprises a sensor adapted to sense the movement or position caused by the electrically driven motor/actuator in relation to said reference position.
- a control system for controlling the yarn tension in at least one yarn feeder as set out above.
- the control system comprises a central controller adapted to electrically set a desired braking force of each of said at least one yarn feeders. The control is based on a determined reference position.
- a look-up table for storing reference positions is located in the central controller.
- the system is adapted to up-date the look-up table based on input received from anyone of said at least one yarn feeder.
- the invention also extends to methods for controlling a yarn feeder in accordance with the above and to a computer program product that when executed on a computer causes the computer to execute a program implementing the method.
- Fig. 1 is a view illustrating a yarn feeder
- - Fig. 2 is a view of a detail of a yarn feeder
- - Fig. 3 is a view illustrating a system for controlling the yarn tension for a number of yarn feeders
- - Fig. 4 is a flow chart illustrating steps performed when controlling yarn tension.
- - Fig. 5 is a view of an alternative braking means.
- Fig. 6 is illustrating a yarn feeder with an electronic yarn tension actuator.
- Fig. 7 is illustrating an alternative execution of a yarn feeder with an electronic yarn tension actuator.
- a yarn feeder 10 is depicted.
- an extension arm 12 usually called top cover in the field of yarn feeders, is arranged extending from a housing 14 for example as described in US 5,947,403.
- the yarn feeder 10 comprises a yarn braking element 16, which is shown in Fig. 1 in its braking position.
- the yarn braking element 16 can for example be a frustum conical element 16, but can be also be of another type or shape.
- the braking element can be made of a plastic material such as PEEK or PET.
- the braking element 16 can be or be arranged flexible. The flexible manner in which the braking element cooperates with the spool body can be achieved in different ways.
- the flexibility can be achieved by having the braking element 16 suspended by springs and/or the braking element can be made, at least in part, of a flexible/elastic material that is deformed when the braking element is forced against the spool body or the flexibility can be provided in some other manner.
- the flexible action of the braking element cooperating with the spool body can hence be of any conventional type and is not discussed in more detail herein.
- the yarn braking element 16 cooperates in a customary manner with the withdrawal rim of the spool body 18.
- the yarn braking element 16 can thus be moved back and forth along an axis A to control the braking force applied to a yarn withdrawn from the yarn feeder 10.
- the yarn braking element 16 can be attached to the extension arm 12 via, an along the axis A slidable brake element holder 27 provided at the extension arm 12.
- the yarn braking element 16 is in the braking position in which it is axially pressed with a predetermined, settable axial force against the spool body 18. This position can be changed by running a motor of a brake motor assembly 20 to vary the contact pressure of the yarn braking element 16, by making the brake element holder 27 move along the axis A in a manner known per se.
- a reference position in which the position of the braking element corresponds to a known braking force needs to be established.
- a position where the braking force just starts to act is established. In such a position there will be a braking force, but the braking force will have a very small magnitude that will not impact the yarn tension in any significant way.
- Such a position can be called a 0-position of the braking element or initial braking position. In other words, this is the position where the braking element just comes into contact with the spool body.
- This position can be saved in a memory to establish a reference position that can be used when electrically controlling the braking force.
- the memory can be located in the yarn feeder or it can be located at another position such as in a control system arranged separately or integrated in the textile machine.
- the initial braking position can be determined manually.
- a thin instrument e.g. an ordinary gauge in the form of a thin sheet of metal or plastic, typically about 0.1 mm thick or less can be placed in the gap between the braking element 16 and the spool body 18.
- the braking element 16 is then driven towards the spool body 18 by for example actuating a pushbutton 5 and when the braking element squeezes the instrument between the braking element and the spool body so that it no longer can be removed without use of an additional force, a manual command is given into the memory by actuating a 0-setting pushbutton 6 to set the initial braking position.
- the initial braking position can also be set by simply visually looking at the braking element 16 when it precisely reaches the spool body 18 and set the initial braking position into the memory accordingly.
- the pushbuttons 5, 6 and 7 can be located at the Human Machine Interface (HMI) on a central control unit, for example in the machine terminal of a textile machine.
- HMI Human Machine Interface
- a sensor is provided to detect a movement of the braking element 16 when the motor 20 is run to move the braking element towards the spool body.
- the sensor can be any type of sensor that detects a movement.
- the sensor can for example be of optical type, sensing the distance between the movable braking element holder and the cone.
- the sensor can also be of the magnet - Hall sensor type, or an inductive sensor. A sensor insensitive for dust is typically advantageous.
- a Hall sensor 25 is used together with a permanent magnet 24.
- the Hall 25 sensor is located at the moving brake element holder 19 and the magnet 24 is attached to the braking element 16.
- the Hall sensor can be located at a fixed location on the yarn feeder 10 and the permanent magnet 24 is attached to the moveable braking element 16.
- the motor torque of the motor 20 used to move the braking element 16 is monitored.
- the position where the motor torque starts to increase is set in the memory as the initial braking position.
- a sensor that detects deformation of an elastic part of the braking element 16 can be used when determining the initial braking position.
- a sensor is provided to sense when some part of the braking element starts to be deformed and use that moment as having precisely reached the initial braking position. For example, if the braking element 16 is provided with springs 26 that are stretched when the braking element hits the spool body a sensor sensing that the spring 26 is stretched can be used to set the initial braking position.
- a further embodiment of the Hall sensor - permanent magnet type of solution is depicted.
- another type of braking element is used.
- the braking element 30 is of a type known for example in EP 0963335 and is made of an elastomer, for example polyurethane.
- the Hall sensor 32 is located at a fixed location of the yarn feeder 10, and the permanent magnet 31 is attached to the brake element 30.
- a further embodiment is shown.
- an actuator 35 for example an electromagnet or electrical motor, is used to apply the braking force to a brake holder 38 which in turn transfers the force via the springs 26 to the braking element 16.
- the actuator 35 can be position-controlled and has a
- movement/position sensor for example a Hall sensor 36 co-acting with a permanent magnet 37.
- both the Hall sensor 36 and the Hall sensor 25 detect movement.
- the Hall sensor 25 detects that the permanent magnet 24 is not moving anymore, while the Hall sensor 36 of the actuator 35 still detects movement, and this is then used as the indication that the 0-position of the braking element is reached.
- Fig. 7 shows a further embodiment.
- an actuator 35 for example an electromagnet or electrical motor, is used to apply the braking force to the brake holder 38 which in turn transfers the force via springs to the braking element 16.
- the actuator can be position-controlled and has a movement/position sensor, for example a Hall sensor 36 and a permanent magnet 37. When the actuator starts to move to apply force the Hall sensor 36 detects movement.
- the braking element 16 comes in contact with the spool body 18, the current used to drive the actuator 35 will increase.
- a sensor for example in the drive circuit, is used to monitor the drive current and is correlating the actual current with the actual position of the actuator, detected by the Hall sensor 36 and the permanent magnet 37. When the drive current starts to increase this is then used as the indication that the 0- position of the braking element is reached.
- the desired braking force is then set based on this reference position.
- the desired braking force is set as a percentage of the maximum force applicable.
- the desired braking force can in accordance with another embodiment be set in relation to the range of movement when the motor or actuator drives the braking element towards (and from) the spool body.
- the motor is a stepper motor
- the number of steps relative to the reference position can be used to control the braking force.
- an encoder or another sensor can be used to detect the rotation of the motor respectively the axial movement of the brake element holder 27, thus determining the braking force and thereby the yarn tension.
- the sensor is of absolute type, or a relative type of sensor. In case of relative type of sensor, a homing position can be needed and provided.
- An alternative to an encoder is to have a rotating magnet and two Hall sensors with a relative position between each other, e.g. 90 degrees inter-distance can be used. This will form two sinusoidal signals 90 degrees separated, thus providing a good angle sensor. One can typically extract up to 10-15 positions per revolution with good resolution for this system.
- Another type of sensor that can be used in a similar manner to generate the corresponding functionality is a so called rotary magnetic sensor chip.
- a control system 1 for controlling the yarn tension of a number of yarn feeders 10 is depicted.
- the control system comprises a central controller 2 connected to each of the yarn feeders 10 of the system.
- the controller 2 can comprise a memory 3 storing a look-up table as set out above and a control unit 4 adapted to control the braking force of the yarn feeders 10 to which it is connected either by wire or wirelessly.
- the yarn tension for a number of yarn feeders can be set remotely from a single central location. For example, if one particular setting of the yarn tension yields a good
- the system is adapted to apply a self-learning algorithm that saves useful settings for one machine and enables re-use of that setting for the same machine or for a machine having the same configuration.
- the controller and/or the memory can in one embodiment be located in the weaving machine or knitting machine, and the weaving machine terminal (HMI) can be used to monitor and enter settings.
- a flow chart illustrating some procedural steps that can be performed when controlling the yarn tension in accordance with the teachings hereinabove is shown.
- the braking element is driven towards the spool body in a state where there is no braking force.
- a position is determined when the braking element just reaches the spool body and thus makes contact with the spool body.
- the position determined in step 403 is saved as a reference position, in a step 405.
- the braking force, and thereby the yarn tension is controlled by measuring how an electrically driven motor or actuator drives the braking element in relation to said reference position in a step 407.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
- Knitting Machines (AREA)
- Looms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1600035 | 2016-02-09 | ||
PCT/SE2017/050045 WO2017138857A1 (en) | 2016-02-09 | 2017-01-19 | Yarn feeder with electrically settable yarn brake |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3414378A1 true EP3414378A1 (en) | 2018-12-19 |
EP3414378A4 EP3414378A4 (en) | 2019-02-27 |
EP3414378B1 EP3414378B1 (en) | 2020-10-14 |
Family
ID=59563397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17750510.4A Active EP3414378B1 (en) | 2016-02-09 | 2017-01-19 | Yarn feeder with electrically settable yarn brake |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3414378B1 (en) |
CN (1) | CN108603315B (en) |
WO (1) | WO2017138857A1 (en) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2110458T3 (en) * | 1991-09-20 | 1998-02-16 | Lgl Electronics Spa | SELF-ADJUSTABLE DEVICE TO BRAKE THREAD IN WEFT FEED UNITS. |
IT1261331B (en) * | 1993-11-05 | 1996-05-14 | Lgl Electronics Spa | IMPROVEMENT OF POSITIVE MODULATED BRAKING DEVICES FOR YARN FOR WEFT FEEDERS. |
IT1268111B1 (en) * | 1994-10-10 | 1997-02-20 | Lgl Electronics Spa | POSITIVE MODULATED YARN BRAKING DEVICE, FOR WEFT FEEDING DEVICES |
SE9700666D0 (en) * | 1997-02-24 | 1997-02-24 | Iro Ab | Fadenliefer device and fade brake |
IT1308067B1 (en) * | 1999-06-01 | 2001-11-29 | Lgl Electronics Spa | YARN BRAKING DEVICE, FOR WEFT FEEDER, WITH REDUCED INTERVENTION TIMES |
SE0002813D0 (en) * | 2000-08-02 | 2000-08-02 | Iro Patent Ag | Shut-off braking brake and drive control of Shut-off entries in one web engine |
ITTO20050484A1 (en) * | 2005-07-14 | 2007-01-15 | L G L Electronics Spa | CONTROL UNIT FOR YARN BRAKING DEVICES IN WEAVE FEEDERS FOR WEAVING FRAMES, AND PROCEDURE FOR TUNING THE SAME |
ITTO20110977A1 (en) * | 2011-10-27 | 2013-04-28 | Lgl Electronics Spa | "METHOD AND DEVICE FOR THE OPENING AND NEXT CLOSING OF A WEAVING BRAKE IN A YARN FEEDER" |
-
2017
- 2017-01-19 WO PCT/SE2017/050045 patent/WO2017138857A1/en unknown
- 2017-01-19 EP EP17750510.4A patent/EP3414378B1/en active Active
- 2017-01-19 CN CN201780005033.7A patent/CN108603315B/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3414378B1 (en) | 2020-10-14 |
WO2017138857A1 (en) | 2017-08-17 |
CN108603315A (en) | 2018-09-28 |
EP3414378A4 (en) | 2019-02-27 |
CN108603315B (en) | 2020-05-22 |
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