A tufting tool (20) is provided. The tufting tool can be adapted to be used in a tufting machine. The tufting tool is formed by a first material (22). The tufting tool comprises an insert of a second material (24), where the second material is harder than the first material. The insert is formed by a cavity in the first material filled with the second, melted, material filling said cavity. Hereby a tufting tool with an insert can be made in a robust and efficient manner.
A tufting tool module (10) for a tufting machine is provided. The tufting tool module comprises a plurality of tufting tools (20). The tufting tools have a head portion and a securing portion. The securing portion of each tufting tool is casted in a base block (12). The securing portions of each tufting tool is provided with at least two cut outs (26, 28) located inside the base block. By providing such cut outs it is possible to reduce the lateral pressure differences between the different tufting tools of the tufting tool module during casting of the base block. This is because the cast material, such as zinc, is allowed to move more freely within the cast during casting of the base block. Furthermore, the cut outs will during the cooling phase of the metal, e.g. zinc, control and stabilize the shrinkage so the tufting tools will not be dislocated. In other words, dislocation of the tufting tools during the casting process can hereby be reduced or eliminated. The result is a tufting tool module with improved tolerances.
Described are, among other things,methods and devices for providing a learning procedure in a yarn feeding arrangement (12). The learning procedure aims at providing control data to the controller (32) about system components and behavior of system components of the yarn feeding arrangement beforehand, such that the controller has knowledge of the system components before the weaving machine (10) is started to operate at full operational speed.
D03D 47/34 - Handling the weft between bulk storage and weft-inserting means
B65H 59/38 - Adjusting or controlling tension in filamentary material, e.g. for preventing snarlingApplications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
Described are, among other things,abobbin drive unit (13) comprising a bobbin motor (14) configured to rotate a bobbin (50) around the axis of a bobbin tube (52). The bobbin drive unit comprises a first attachment (53) with a bearing configured to hold a first end of the bobbin tube and a second attachment (54) with a bearing configured to hold a second end of the bobbin tube. The bobbin can then rotate when attached in both ends of the tube. Hereby a bobbin drive unit configured to hold the bobbin in both tube ends of the bobbin is provided. By securing both ends of the bobbin tube, rotation of the bobbin can take place at a high speed without creating vibrations or oscillation to the bobbin drive or surrounding components that would otherwise risk interfering with sensors or deteriorate components and potentially reduce the life time of components of a yarn feeding arrangement.
D03D 47/34 - Handling the weft between bulk storage and weft-inserting means
B65H 59/38 - Adjusting or controlling tension in filamentary material, e.g. for preventing snarlingApplications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
Described are, among other things, methods and devices in an adjustable yarn brake. The adjustable yarn brake (10) is configured to have a reference position set for the adjustable yarn brake. The adjustable yarn brake comprises a position sensor (50) configured to output an output signal indicative of the position of a movable member of the adjustable yarn brake, wherein the brake force of the adjustable yarn brake is set in response to the position of the movable member. Hereby it is possible to re-set a braking force in a cost-efficient manner and with low complexity.
D03D 47/34 - Handling the weft between bulk storage and weft-inserting means
B65H 59/06 - Adjusting or controlling tension in filamentary material, e.g. for preventing snarlingApplications of tension indicators by regulating delivery of material from supply package by devices acting on material leaving the package
Described are, among other things,methods and devices for feeding yarn to a textile machine(10). The yarn feeding device comprises a moveable yarn carrier (24) adapted to transport yarn in a first, forward direction and a loop former (18) adapted to draw yarn from a yarn storage (14). The device also has moveable loop keeping members (20) arranged at opposite lateral sides of an input section of the moveable yarn carrier, wherein the loop former is adapted to position yarn on the moving loop keeping members by moving the yarn from side to side. The moveable loop keeping members are adapted to hold the yarn positioned thereon and to release the yarn onto the moveable yarn carrier in a meandering pattern at an input area of the moveable yarn carrier and the yarn lying on the moveable carrier is adapted to leave the moveable yarn carrier at an output section of the moveable yarn carrier.
Described are, among other things,methods and devices for feeding yarn to a weaving machine (10), using a weft yarn feeding arrangement (12) for feeding weft yarn (40) to a weaving machine (10) having at least one rapier (11). The yarn feeding arrangement comprises a motor driven bobbin (13) and a motor driven loop buffer device (16). The yarn feeding arrangement further comprising a controller (32) for controlling the motor of the motor driven bobbin and the motor driven loop buffer device. The controller is adapted to -drive the motor (14) of the motor driven bobbin at a speed to feed an average or essentially an average amount of weft yarn that the weaving machine consumes wherein said essentially average amount of weft yarn deviates less than a pre-set amount from the actual average amount consumed by the weaving machine. -drive the motor of the motor driven loop buffer device based on the difference between the output speed of yarn (40) from the motor driven bobbin and a model of weft yarn insertion speed in the weaving machine and -adjust the drive of the motor of the motor driven loop buffer device based on a signal representing the actual weft yarn tension.
D03D 47/34 - Handling the weft between bulk storage and weft-inserting means
B65H 59/38 - Adjusting or controlling tension in filamentary material, e.g. for preventing snarlingApplications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
Described are, among other things,methods and devices for controlling a weft yarn feeding device(16) for feeding yarn to a weaving machine (10), wherein yarn is inserted into the shed of the weaving machine having at least one rapier. The weft yarn feeding device comprises at least one yarn guide (20) provided on a moving member (19) driven by a controlled motor (18) of the weft yarn feeding device to cause the moving member to move back and forth. When in use, yarn is drawn from a weft yarn storage (13, 14) via said at least one guide (20) provided on said moving member (19) into the weaving machine (10).
Described are, among other things, methods and devices for feeding weft yarn to a weaving machine (10) using a yarn feeding device (16) comprising at least one endless running belt (22) driven by a controlled motor (24). The running belt comprises at least one yarn transport element (26) each, the yarn transport element(s) being adapted to draw yarn (40) from a yarn storage (14) and to release the yarn at a set location to form a loop or loops of yarn acting as a yarn buffer for the weaving machine. There is also at least one yarn restraining element (30) adapted to hold the yarn in a loop.
Described are, among other things,methods and devices that set a reference position for a braking element (16) used in a yarn feeder(10). The methods and devices as described herein makes it possible to know exactly the position when the braking of the yarnstarts to act and thereby establish a reference position that is known by a system that then sets the desiredbraking force electronically based on the reference position. Hereby it is possibleto have a predictable and repeatable electrically set braking force without making use of a downstream yarn tension sensor.
D03D 47/34 - Handling the weft between bulk storage and weft-inserting means
B65H 59/06 - Adjusting or controlling tension in filamentary material, e.g. for preventing snarlingApplications of tension indicators by regulating delivery of material from supply package by devices acting on material leaving the package
11.
YARN FEEDER WITH MOTOR ASSEMBLY FOR YARN TENSION REGULATION
Described are, among other things, a yarn feeder yarn feeder (10) comprising a brake motor assembly (20). The brake motor assembly (20) is adapted to control the position of a braking element (16) cooperating with a spool body (18) of the yarn feeder (10). The yarn feeder (10) further comprises a quick release mechanism whereby the braking element (16) can be moved from a braking position where the braking element (16) is positioned to brake a yarn withdrawn from the yarn feeder (10) and a gap position where the braking element (16) is distanced from the spool body (18). A motor (26) of the brake motor assembly (20) is fixedly arranged in or attached to a part that is released when operating-said quick release mechanism. Hereby it is possible to provide a motor driven braking element in a yarn feeder with a quick release mechanism.
D03D 47/34 - Handling the weft between bulk storage and weft-inserting means
B65H 51/22 - Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
B65H 59/06 - Adjusting or controlling tension in filamentary material, e.g. for preventing snarlingApplications of tension indicators by regulating delivery of material from supply package by devices acting on material leaving the package
12.
AIR JET WEAVING MACHINE COMPRISING ELECTROMAGNETIC VALVE
Described are, among other things, an air-jet weaving machine (1) comprising a compressed air valve and nozzle arrangement (31, 35) with improved response time, and which may also have a lower variance in its response time. Hereby a more efficient use of energy can be achieved in the air-jet weaving machine. The valve and nozzle arrangement (31, 35) is connected to a compressed air supply feeding the nozzle(s) via the valve(s) with the compressed air. The valve is an electromagnetic valve having a core that can be magnetized using a coil fed with an excitation current. The valve further comprises a valve member (49). The valve member can in particular be formed by a number of flexible plates (51, 91) stacked on top of each other. The plates are, at least partly, made of a magnetisable material. The valve member is located in a space interconnecting an inlet and outlet of the valve. The valve member can move in the space between two positions; a first position when there is no excitation current in the coil, and a second position when there is an excitation current in the coil. In one of the two positions the valve member is forced to close, in the other position to open a compressed air flow channel formed in the space between the inlet and outlet of the valve and leading further to the nozzle (35).
D03D 47/30 - Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
F16K 31/06 - Operating meansReleasing devices electricOperating meansReleasing devices magnetic using a magnet
A yarn feeding device F comprises at least one electro-optical yarn sensor S having at least one combination of a light source E and a physically closely adjacent receiver R. In the light path between the light source/receiver combination and a reflective scanning zone 12 on a storage body of the yarn feeding device a transparent optical spreading body B is provided which spreads a substantially round light spot 17 into a longitudinal light strip in the reflective yarn scanning zone 12, the transparent spreading body B being arranged such that the longitudinal axis of the light strip is oriented substantially parallel to the axes of the windings of a yarn Y carried by the storage body periphery.
A stand S for supporting yam feeders and/or yam bobbins. The stand comprises a framework structure F of essentially horizontally and vertically extending metallic hollow profile struts 10, 10' , 21 , which are firmly but detachably interconnected at comers 5, and/or nodal points 6, the struts being provided with joint cut-outs made by laser-cutting, the struts being joined at the corner 5 or the nodal point 6 by inter-penetration at their cut-outs, and the struts being fixed together at the corner or the nodal point by at east one securing element 13.
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