EP2640880B1 - Gripper head for the insertion of weft threads on a gripper weaving machine - Google Patents

Gripper head for the insertion of weft threads on a gripper weaving machine Download PDF

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Publication number
EP2640880B1
EP2640880B1 EP11758197.5A EP11758197A EP2640880B1 EP 2640880 B1 EP2640880 B1 EP 2640880B1 EP 11758197 A EP11758197 A EP 11758197A EP 2640880 B1 EP2640880 B1 EP 2640880B1
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EP
European Patent Office
Prior art keywords
gripper
clamping part
valve
head
hollow body
Prior art date
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Active
Application number
EP11758197.5A
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German (de)
French (fr)
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EP2640880A2 (en
Inventor
Markus Gielen
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Lindauer Dornier GmbH
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Lindauer Dornier GmbH
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Publication date
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Publication of EP2640880A2 publication Critical patent/EP2640880A2/en
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Publication of EP2640880B1 publication Critical patent/EP2640880B1/en
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    • 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
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/20—Constructional features of the thread-engaging device on the inserters
    • D03D47/23—Thread grippers

Definitions

  • the present invention relates to a rapier head for the entry of weft threads on a rapier loom and a rapier loom with such a rapier head.
  • rapier looms In the prior art rapier looms are known in which a weft thread is transported from one side of the loom by a first gripper through the shed over half the fabric width to the machine center and there passed to a second gripper. The second gripper transports the weft thread through the shed over the second half of the fabric width to the other side of the loom.
  • Gripper with such gripper heads shows, for example, the DE 1710292 A1 , This describes a pair of gripper heads consisting of a Bringer gripper and a Holer gripper with which weft threads are entered into a shed.
  • the grippers consist of a gripper head and a gripper bar, which are alternately advanced by a gear in the shed and withdrawn. It gripper heads are used, which hold the weft yarn with thread clamps.
  • a thread clamp consists of a fixed and a movable clamping part.
  • the movable clamping part is designed as a clamping lever and is pressed by a force on the fixed clamping part. The force is applied by means of a spring mounted in the gripper head.
  • the movable clamping part ie the clamping lever is opened or closed in the current weaving operation. This makes it possible to detect or release the weft thread.
  • Control devices according to the DE 1710292 A1 allow a very safe transfer of the weft thread in the machine center. However, there is a desire for higher speeds of such rapier loom.
  • the GB 2 059 455 A proposes an arrangement whose basic operating principle is that an electrically controlled magnet acts on a locking element in the gripper head, which releases the clamping lever or levers; These open or close under spring force.
  • the DE 102 52 053 A shows a spring-loaded clamping lever with locking element which is released piezoelectrically to open the clamping lever.
  • EP 984089 A1 shows a system in which the adjustment of the clamping force of a thread clamp a rapier head takes place pneumatically while the machine is running. For this purpose, a bellows mounted on the gripper head is placed under pressure. However, a control of the thread clamp in the machine center for transferring the weft thread from a Bringer rapier head to a Holer gripper head is not possible with this design.
  • Object of the present invention is to provide a rapier head, the thread clamp for the weft thread contactless and with high transfer reliability of the weft thread can be controlled in the middle of the machine.
  • a known thread clamp is attached, which has a fixed clamping part and a movable clamping part.
  • a first hollow body is further attached, whose volume is increased under internal pressure of a gaseous and thus compressible medium.
  • air is used as the medium.
  • the first hollow body is connected to the movable clamping part in such a way that a force is exerted on the movable clamping part by the change of the volume from the hollow body, which force is referred to below as clamping partial force.
  • a return means is present, which is also in connection with the movable clamping part.
  • the return means is preferably designed as a spring.
  • the Restoring force of the restoring means counteracts the movable clamping part of the clamping part force, which is exerted by the increase in volume of the first hollow body on the movable clamping part.
  • a second hollow body is mounted on the gripper head, in which an internal pressure of the same medium already mentioned can be generated.
  • an external force can be applied to the second hollow body in such a way that it causes a change, i. causes a reduction in the volume of the second hollow body.
  • a control force is hereinafter referred to as a control force.
  • a valve is also attached on the gripper head according to the invention.
  • This valve is connected to the first and the second hollow body in such a way that a pressure equalization between the two hollow bodies can take place by opening the valve.
  • the gaseous medium is passed from one to the other hollow body.
  • the valve is also a means for closing is attached.
  • a closing force is generated which counteracts forces by which the valve is opened.
  • a movable valve body is preferably provided in the valve, on which, for example, a closing means designed as a valve spring engages. The valve body is thereby pressed against a valve seat, so that an opening through which the gaseous medium is passed through the valve, remains closed.
  • a dimensioning of the closing means e.g. a valve spring, that the valve remains closed, as long as the acting on the valve body pressure of the gaseous medium does not exceed certain values.
  • the closing means can also be designed as an elastically deformable membrane in the valve.
  • the valve is designed such that it can be actuated by non-contact transmission of signals or forces, that is to open or close.
  • Preferred is an embodiment in which magnetic forces generated outside of the rapier head act on the valve body.
  • valve systems are also conceivable, e.g. be controlled by high-frequency electromagnetic radio signals.
  • the gripper head according to the invention can be designed both as a Bringer rapier head and as a Holer rapier head.
  • the thread clamp is closed by the clamping part force which exerts the first hollow body under internal pressure on the movable clamping part.
  • the movable clamping part is pressed onto the fixed clamping part.
  • the thread clamp is opened, because the restoring force acting on the movable clamping part counteracts the clamping part force.
  • the return means, the movable clamping member and the first hollow body are arranged such that the effect of the forces in relation to the Bringer rapier head is reversed:
  • the thread clamp is closed by means of the restoring force, in that the two clamping parts of the thread clamp are pressed against one another and the thread clamp is opened by the clamping part force of the first hollow body.
  • control lever This is attached to the gripper head in such a way that control forces can be applied to the second hollow body, which produce a reduction in its volume, ie internal pressure.
  • the control lever can be articulated or elastically mounted in the gripper head. It can advantageously have a control surface over which a force can be applied to the control lever from outside the gripper head. The arrangement is designed so that this is possible even when the gripper head is in motion.
  • the grippers according to the invention are intended for use in a rapier weaving machine.
  • This rapier loom contains in an advantageous development the invention, a valve opening device for non-contact opening of the valve in the gripper head.
  • one or more actuators are provided.
  • an actuator is provided which does not come into contact with the gripper head when the valve is actuated.
  • This may be, for example, an electromagnet, which is controlled by an electronic controller of the rapier as needed at certain times in the weaving cycle. This can also take place during the movement of the rapier head through the shed of the rapier loom.
  • the actuator is advantageously mounted in the region of the track of the gripper head so for example below the track over which the warp threads are guided in the weaving machine.
  • the attachment can be in the middle of the machine but also outside the course of the fabric or the shed on the sides of the machine.
  • the gripper loom with rapier heads according to the invention contains at least one control device with which at certain times in the weaving cycle, a control force via a control rail via a control lever on the second hollow body can be applied, whereby the reduction of the volume and thus the internal pressure in the second hollow body is formed.
  • control device is equipped with electromechanical or pneumatic means for varying the control force or the control stroke.
  • rapier loom with the gripper heads will be explained below using the example of a Bringer rapier head.
  • This is the drover head, which picks up the weft thread outside the shed and brings it to the machine center of the rapier loom, where the weft thread is transferred to a holer rapier head.
  • the first hollow body for actuating the movable clamping member is still without increased internal pressure and the movable clamping member is held open by the clamping adjusting means.
  • the control device present on the rapier loom is actuated such that an internal pressure is produced in the second hollow body on the bringer rapier head.
  • valve When a certain size of this internal pressure is exceeded, the valve is opened by the compressed in the second hollow body compressed air against the closing force acting on the valve body.
  • the air compressed in the second hollow body flows via the valve and a compressed air line into the first hollow body.
  • This clamping part force causes the movable clamping part is pressed against the restoring force of the return means on the fixed clamping part, so that the weft thread is clamped with a resulting clamping force and restoring force retaining force.
  • the Bringer rapier head passes through its forward movement from the working area of the control device.
  • the control device can also be actuated in such a way that no control force acts on the second hollow body before. In both cases this will now be depressurized.
  • the valve spring is dimensioned so that the valve remains closed and the internal pressure in the first hollow body is maintained for actuating the movable clamping part.
  • the clamped weft yarn can be transported to the position thread transfer to the Holer gripper head in the machine center.
  • the valve is opened by another actuator mounted in the center of the machine. This happens without contact between actuator and rapier head. There is thus no mechanical wear between the components involved.
  • the compressed air in the first hollow body for actuating the movable clamping part now escapes via the compressed air line and the valve in the second hollow body which is unpressurized at this time.
  • the movable clamping member is released by the restoring force of the return means of the fixed clamping member and the Thread clamp is opened.
  • the weft thread can now be taken over by the holer gripper head.
  • the Bringer rapier head then moves out of the shed with the thread clamp open and the weaving cycle is repeated.
  • the return means may be formed for example as a tension spring as a compression spring or as a bending spring. Also pneumatic or magnetically acting spring elements and combinations between springs and magnets are conceivable as embodiments of the return means.
  • the generation of the control force by the control device can for example also take place via a fixed slide or control rail.
  • the second hollow body and / or the control lever in the gripper head in this case have a corresponding control or contact surface, which starts against the fixed control rail during the movement of the gripper head, so that a force is exerted on the contact surface by the control rail, without an actively controlled movement the control rail takes place in the direction of the gripper head.
  • the hollow bodies whose volume changes are related to an outwardly or externally acting force, are preferably formed as an expandable bellows or as a pneumatic cylinder.
  • an expandable bellows as a hollow body of this bellows usually contains by its elasticity already a return means that applies a restoring force on the contact surface between the bellows and the movable clamping part. But it can also be integrated in the bellows or in the pneumatic cylinder, a return spring as a separate component.
  • electromagnets as stationary stationary permanent magnets can be used, which open the valve in the gripper head at the time when the gripper head is moved past it.
  • a combination of permanent magnet and electrically controllable magnetic coil is possible.
  • FIGS. 1 to 3 show various views of a first embodiment of the gripper head according to the invention as Bringer rapier head 1.
  • the Bringer rapier head 1 consists of a base body in the form of a U-profile.
  • For fastening the U-profile for example, on a rapier bar holes are provided at one end of the base body, which are used for a screw connection.
  • At the other end of the body are the fixed clamping part 4 of a thread clamp 3, and a guide contour for the weft thread 2. Between thread clamp 3 and guide contour, a weft thread portion is formed when receiving a weft yarn 2.
  • the movable clamping part 5 of the thread clamp 3 is designed as a clamping lever with two lever arms. Between the two lever arms there is an axis of rotation, via which the movable clamping part 5 is rotatably mounted in the base body. At the front, the hook tip closer lever arm of the movable clamping member 5, a jaw is mounted in a known manner. Depending on the type of weft thread, versions without a jaw are also possible. At the rear of the hook tip remote lever arm of the movable clamping member 5 is a contact surface on which the movable clamping member 5 with a first hollow body 6 is in communication. This hollow body 6 is formed as an expandable bellows, which is attached to the main body of the Bringer rapier head 1.
  • the movable clamping part 5 In order to clamp the weft thread 2 between the movable clamping part 5 and the fixed clamping part 4, the movable clamping part 5 is pivoted about its axis of rotation in the clockwise direction. This is done by a force acting from the bellows 6 on the lever tip of the movable clamping part 5 facing away from the hook tip.
  • the weft thread 2 When transporting the weft thread 2 into the shed of the rapier weaving machine, the weft thread 2 is held in the bringer rapier head 1 in the thread clamp 3 and in the already mentioned guide contour.
  • the guide contour which is open towards the tip of the rapier-rapier head 1 is covered by the gripper during the movement of the gripper through a cover lever 15 towards the tip. This prevents that warp threads that run in the shed transverse to the direction of the bringer rapier head 1, are detected by the guide contour in an undesirable manner.
  • the cover 15 is rotatably mounted in the body.
  • the axis of rotation is congruent with the axis of rotation of the movable clamping member 5.
  • Movable clamping member 5 and cover lever 15 are connected together so that a rotational movement of the movable clamping member 5 causes a rotational movement of the cover lever 15.
  • the upper end of a restoring spring 7 acting as a return means is fastened.
  • the lower end of the return spring 7 is attached to the main body of the Bringer rapier head 1.
  • the return spring 7 is biased to train, so rotated without the action of other forces, the movable clamping member 5 together with the cover 15 counterclockwise and thus the thread clamp 3 is opened. Only when the clamping part force acting from the bellows 6 on the movable clamping member 5, this exerts a greater torque than the spring force of the return spring 7, the thread clamp 3 is closed.
  • the expandable bellows 6 is attached in the present embodiment in the gripper tip facing to the front half of the Bringer rapier head 1.
  • This bellows 6 has at its upper end a contact surface to the movable clamping part 5.
  • the lower end is fixed to the main body of the Bringer rapier head 1 and has a compressed air opening, can be introduced via the compressed air into the bellows 6.
  • an internal pressure is generated in the bellows 6, which leads to an increase in volume of the bellows 6.
  • This increase in volume causes the clamping part force which is exerted by the bellows 6 on the lever arm of the movable clamping part 5 designed as a clamping lever.
  • a compressed air line is provided in the present embodiment.
  • This compressed air line connects the first bellows 6 with the second hollow body 8 according to the invention.
  • This second hollow body 8 is likewise designed as an expandable bellows. This is mounted in the rear, the hook tip from facing half of the Bringer rapier head 1 and also has a contact surface on the top and a compressed air port on the bottom.
  • a valve 9 is provided, through which in the opened state, a connection between the two hollow bodies 6, 8 is made such that compressed air can flow from one to the other hollow body.
  • the valve 9 is formed in the present example as a check valve, which consists of a valve body and acting as a closing means valve spring 10. These elements are arranged in a compressed air-conducting valve housing.
  • the valve housing is connected to the main body of the Bringer rapier head 1.
  • the valve body is vertically movable in the valve housing.
  • the valve spring 10 is mounted and biased such that the closing force of the valve spring pushes the valve body with its upper boundary surface against the outlet of the compressed air opening at the lower end of the second bellows 8; As a result, the valve 9 is kept closed.
  • the contact surface on the upper side of the second bellows 8 is connected to one end of a control lever 11 in connection, the other end in the Bringer gripper head 1 is stored.
  • This control is carried out in the present example via a rotation axis in the front half of the bringer rapier head 1.
  • the control lever 11 has on a top on a control surface, on the outside of the bringer rapier head 1 by means of elements of the control device against a force and thus a rotational movement can be applied clockwise to the control lever 11.
  • a control lever spring on the main body of the Bringer rapier head 1 is mounted below the control lever 11. In the prestressed state, the spring force of this control lever spring causes a rotational movement of the control lever 11 in a clockwise direction.
  • control lever spring could be arranged in another embodiment, also within the second bellows 8 such that it pushes the upper contact surface with the end of the control lever 11 upwards.
  • the control lever and the second bellows 8 are thereby reset.
  • Conceivable of course, at this point means for resetting, which are analogous to the above-described various embodiments of the return means 7 for the movable clamping member 5 are executed.
  • the spring force of the control lever spring counteracts compression of the second bellows 8.
  • the second bellows 8 is inside more or less pressureless or has ambient pressure.
  • the first bellows 6 is depressurized and is therefore pressed together via the return spring 7 and the movable clamping part 5 - its volume is reduced.
  • the thread clamp 3 and the cover 15 are open.
  • the weft yarn 2 to be introduced next is presented to the bringer rapier head 1 transversely to the direction of movement of the gripper by one of the usual selection devices of a rapier weaving machine. In a forward movement of the bringer rapier head 1 in the direction of its tip or in the direction of the shed, the presented weft thread 2 is detected by the thread clamp 3 and by the guide contour.
  • the thread clamp 3 must now be closed.
  • FIG. 4 This is in FIG. 4 shown.
  • the Bringer rapier head 1 comes into the working area of the control rail 14 of the control device.
  • the control rail 14 is moved vertically downwards.
  • a non-illustrated drive is present, which may for example consist of a cam and a roller lever guided thereon.
  • the cam is driven by the main drive of the loom.
  • the control rail 14 of the control device comes in its vertical movement in contact with the control lever 11 and presses on this the second bellows 8 together.
  • the volume of the bellows 8 decreases and the air therein is compressed. The result is an increased internal pressure in the bellows 8.
  • the valve body is pressed against the valve spring force down - the valve 9 opens.
  • the compressed air is conducted via the compressed air line to the first bellows 6.
  • the bringer rapier head 1 is then moved in a known manner through the shed formed by warp shafts into the machine center of rapier loom. There, the thread clamp 3 must be opened so that the weft thread 2 can be transferred to the Holer rapier head 101.
  • FIG. 5 This process is in FIG. 5 shown.
  • the illustrated embodiment of rapier loom with gripper heads (1,101) according to the invention has a valve opening device 12 for actuating electromagnetic actuators 13.
  • a first such actuator 13 is in FIG. 5 shown below the Bringer rapier head 1.
  • a second actuator 113 is also mounted below the Holer rapier head 101.
  • the actuators 13, 113 are arranged in such an integrated manner in the track approximately in the machine center below the track of the gripper heads 1, 101, that the warp threads can be passed without damage between gripper head bottoms and the gripper raceway. In the direction of movement of the gripper heads, the arrangements of the actuators 13, 113 constructively chosen such that the function of the yarn transfer between Bringer and Holer rapier head 1, 101 can be performed safely.
  • FIG. 5 It is shown that the bringer rapier head 1 has reached the position of the first actuator 13 during its movement in the region of the machine center.
  • the actuator 13 By a control pulse of the valve opening device 12, the actuator 13 is actuated in such a way that a magnetic actuator force acts without contact on the valve 9 in the bringer rapier head 1.
  • the valve 9 is opened.
  • the spring force of the return spring 7 presses the first bellows 6 together.
  • the compressed air flows through the valve 9 into the second bellows 8 and the thread clamp 3 opens. Since the cover lever 15 simultaneously pivots upward, the weft yarn 2 is free and can be detected by the holer rapier head 101 and transported on.
  • FIGS. 6 to 8 the construction of a second embodiment of the gripper head according to the invention, namely a holer rapier head 101 is shown.
  • the holer rapier head 101 has in its rear, the hook tip facing away from a U-shaped form with mounting holes. In the front half, however, the holer rapier head 101 has a single point with a thread clamp 103. There is no guide contour and no cover lever 15 is present, since in the holer rapier head 101 no weft thread section must be formed.
  • the holer gripper head 101 is in principle the same structure as the bringer gripper head 1, but the thread clamp 103 is closed by the return spring 107 and the thread clamp 103 is opened by increased internal pressure in the first expandable bellows 106 for actuating the movable clamping member 105.
  • the movable clamping part 105 has a fork shape, whereby the movable clamping part 105 laterally surrounds the hook tip with the fixed clamping part 104 due to this fork shape.
  • the fixed clamping part 104 is located on the underside of a hook tip directed away from the hook tip.
  • the thread clamp 103 closes by an upward movement of the movable clamping member 105th
  • control lever 111 is fork-shaped in the front, the gripper tip facing half, while having a control surface on the rear half.
  • the first and the second hollow body 106, 108, the valve 109 and the return spring 107 are arranged similarly in the holer rapier head 101 as in the bringer rapier head 1.
  • FIG. 8 the Holer rapier head 101 is shown with the thread clamp 103 open.
  • the first bellows 106 is under internal pressure.
  • Valve 109 with valve spring 110 is closed.
  • FIG. 9 shows that the take-over of the weft thread 2, the valve 109 is opened by a second mounted below the holer rapier head 101 electromagnetic actuator 113.
  • the compressed in the first bellows 6 air escapes through the compressed air line and the valve 109 in the second expandable bellows 8.
  • the movable clamping member 105 is closed by the return spring 107.
  • the weft thread 2 is now clamped by the thread clamp 103 of the holer rapier head 101.
  • the holer rapier head 101 is now moved out of the shed with the thread clamp 103 closed.
  • the holer rapier head 101 comes into the working area of a further control device, which is constructed analogously to the control device of the bringer rapier head 1. This is in FIG. 10 shown.
  • a further control device which is constructed analogously to the control device of the bringer rapier head 1.
  • FIG. 10 shown.
  • the control rail 114 By the control rail 114, an increased internal pressure is generated via the control lever 111 in the bellows of the second hollow body 108 on the holer rapier head 101. Due to the increased pressure, the valve 109 is opened and the compressed air flows into the first bellows 6. This causes the thread clamp 103 is opened and the weft yarn 2 is released.
  • weft thread 2 is struck by the Webblatt coupled the rapier loom to the fabric edge and begin the operations described for weft insertion again.
  • a third embodiment of a rapier head according to the invention is shown as Bringer rapier head 201.
  • the valve 209 is mounted below the first bellows 206 and not below the second bellows 208.
  • the arrangement according to FIG. 11 and 12 As a result, with respect to the valve 209, a reverse direction of action of the internal pressure in the two hollow bodies 206, 208 occurs.
  • an increased internal pressure in the first bellows 206 counteracts the restoring force in the valve 209.
  • the operation is similar to the first embodiment.
  • an additional actuator 213 is needed, since the valve 209 can not be opened by overpressure in the second bellows 208 in this arrangement.
  • FIG. 11 shows the generation of an overpressure in the second elastically deformable bellows 208 by means of control lever 211 and the subsequent closing of the thread clamp 203 by actuating the actuator 13 in the thread take-up.
  • FIG. 12 shows the opening of the thread clamp 203 of the Bringer rapier head 201 according to the third embodiment in the machine center by operating the actuator 13 and the action of the return spring 207 in the machine center.

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Description

Die vorliegende Erfindung betrifft einen Greiferkopf zum Eintrag von Schussfäden an einer Greiferwebmaschine sowie eine Greiferwebmaschine mit einem derartigen Greiferkopf.The present invention relates to a rapier head for the entry of weft threads on a rapier loom and a rapier loom with such a rapier head.

Es sind im Stand der Technik Greiferwebmaschinen bekannt, bei denen ein Schussfaden von einer Seite der Webmaschine durch einen ersten Greifer durch das Webfach über die halbe Gewebebreite bis zur Maschinenmitte transportiert und dort an einen zweiten Greifer übergeben wird. Der zweite Greifer transportiert den Schussfaden durch das Webfach über die zweite Hälfte der Gewebebreite zur anderen Seite der Webmaschine.In the prior art rapier looms are known in which a weft thread is transported from one side of the loom by a first gripper through the shed over half the fabric width to the machine center and there passed to a second gripper. The second gripper transports the weft thread through the shed over the second half of the fabric width to the other side of the loom.

Greifer mit derartigen Greiferköpfen zeigt zum Beispiel die DE 1710292 A1 . Diese beschreibt ein Paar von Greiferköpfen bestehend aus einem Bringer-Greifer und einem Holer-Greifer, mit denen Schussfäden in ein Webfach eingetragen werden. Die Greifer bestehen aus einem Greiferkopf und einer Greiferstange, die durch jeweils ein Getriebe wechselnd ins Webfach vorgeschoben und zurückgezogen werden. Es werden Greiferköpfe verwendet, die den Schussfaden mit Fadenklemmen halten. Eine Fadenklemme besteht aus einem feststehenden und einem beweglichen Klemmteil. Das bewegliche Klemmteil ist als Klemmhebel ausgebildet und wird durch eine Kraft auf das feststehende Klemmteil gedrückt. Die Kraft wird mittels einer im Greiferkopf angebrachten Feder aufgebracht. Durch Steuervorrichtungen an der Webmaschine wird das bewegliche Klemmteil, d.h. der Klemmhebel im laufenden Webbetrieb geöffnet oder geschlossen. Dadurch wird ein Erfassen oder Freigeben des Schussfadens ermöglicht.Gripper with such gripper heads shows, for example, the DE 1710292 A1 , This describes a pair of gripper heads consisting of a Bringer gripper and a Holer gripper with which weft threads are entered into a shed. The grippers consist of a gripper head and a gripper bar, which are alternately advanced by a gear in the shed and withdrawn. It gripper heads are used, which hold the weft yarn with thread clamps. A thread clamp consists of a fixed and a movable clamping part. The movable clamping part is designed as a clamping lever and is pressed by a force on the fixed clamping part. The force is applied by means of a spring mounted in the gripper head. By control devices on the weaving machine, the movable clamping part, ie the clamping lever is opened or closed in the current weaving operation. This makes it possible to detect or release the weft thread.

Steuereinrichtungen gemäß der DE 1710292 A1 ermöglichen eine sehr sichere Übergabe des Schussfadens in Maschinenmitte. Es besteht jedoch der Wunsch nach höheren Drehzahlen einer derartigen Greiferwebmaschine.Control devices according to the DE 1710292 A1 allow a very safe transfer of the weft thread in the machine center. However, there is a desire for higher speeds of such rapier loom.

Im Stand der Technik gibt es Vorschläge, wie man eine höhere Leistung dadurch erzielt, dass die Fadenklemmen der Greiferköpfe durch Aktuatoren nach verschiedenen physikalischen Prinzipien berührungslos gesteuert werden.In the prior art there are suggestions on how to achieve a higher performance by the fact that the thread clamps of the gripper heads are controlled without contact by actuators according to various physical principles.

Die GB 2 059 455 A schlägt eine Anordnung vor, deren grundlegendes Funktionsprinzip darin besteht, dass ein elektrisch gesteuerter Magnet auf ein Arretierelement im Greiferkopf wirkt, das den oder die Klemmhebel freigibt; diese öffnen oder schließen unter Federkraft.The GB 2 059 455 A proposes an arrangement whose basic operating principle is that an electrically controlled magnet acts on a locking element in the gripper head, which releases the clamping lever or levers; These open or close under spring force.

Die DE 102 52 053 A zeigt einen federbelasteten Klemmhebel mit Arretierelement, das zum Öffnen des Klemmhebels piezoelektrisch gelöst wird.The DE 102 52 053 A shows a spring-loaded clamping lever with locking element which is released piezoelectrically to open the clamping lever.

In beiden genannten Fällen ist die Klemmkraft der Fadenklemmen nicht bei laufender Maschine an verschiedene Garneigenschaften anpassbar.In both cases, the clamping force of the thread clamps is not adaptable to different yarn properties while the machine is running.

EP 984089 A1 (dort Fig. 11 und 12) zeigt ein System, bei welchem die Einstellung der Klemmkraft einer Fadenklemme eines Greiferkopfes auf pneumatischem Wege bei laufender Maschine erfolgt. Dazu wird ein am Greiferkopf angebrachter Balg unter Inndruck gesetzt. Eine Steuerung der Fadenklemme in Maschinenmitte zur Übergabe des Schussfadens von einem Bringer-Greiferkopf zu einem Holer-Greiferkopf ist mit dieser Ausführung jedoch nicht möglich. EP 984089 A1 (there Fig. 11 and 12 ) shows a system in which the adjustment of the clamping force of a thread clamp a rapier head takes place pneumatically while the machine is running. For this purpose, a bellows mounted on the gripper head is placed under pressure. However, a control of the thread clamp in the machine center for transferring the weft thread from a Bringer rapier head to a Holer gripper head is not possible with this design.

Aufgabe der vorliegenden Erfindung ist es, einen Greiferkopf zu schaffen, dessen Fadenklemme für den Schussfaden berührungslos und mit hoher Übergabesicherheit des Schussfadens auch in der Maschinenmitte gesteuert werden kann.Object of the present invention is to provide a rapier head, the thread clamp for the weft thread contactless and with high transfer reliability of the weft thread can be controlled in the middle of the machine.

Die Aufgabe wird durch einen Greiferkopf sowie einer Greiferwebmaschine mit einem derartigen Greiferkopf mit den Merkmalen der unabhängigen Ansprüche gelöst.The object is achieved by a rapier head and a rapier with such a rapier head with the features of the independent claims.

An einem erfindungsgemäßen Greiferkopf zum Eintrag von Schussfäden an einer Greiferwebmaschine ist eine an sich bekannte Fadenklemme angebracht, die ein feststehendes Klemmteil und ein bewegliches Klemmteil aufweist. Am Greiferkopf ist weiterhin ein erster Hohlkörper angebracht, dessen Volumen unter Innendruck eines gasförmigen und damit auch kompressiblen Mediums vergrößert wird. Vorzugsweise wird als Medium Luft eingesetzt. Der erste Hohlkörper ist derartig mit dem beweglichen Klemmteil verbunden, dass durch die Veränderung des Volumens vom Hohlkörper eine Kraft auf das bewegliche Klemmteil ausgeübt wird, die im Folgenden als Klemmteilkraft bezeichnet wird. Am Greiferkopf ist außerdem eine Rückstellmittel vorhanden ist, das ebenfall mit dem beweglichen Klemmteil in Verbindung steht. Das Rückstellmittel ist vorzugsweise als Feder ausgebildet. Die Rückstellkraft des Rückstellmittels wirkt am beweglichen Klemmteil der Klemmteilkraft entgegen, die durch die Volumenvergrößerung des ersten Hohlkörpers auf das bewegliche Klemmteil ausgeübt wird.At a rapier head according to the invention for the entry of weft threads on a rapier a known thread clamp is attached, which has a fixed clamping part and a movable clamping part. On the gripper head, a first hollow body is further attached, whose volume is increased under internal pressure of a gaseous and thus compressible medium. Preferably, air is used as the medium. The first hollow body is connected to the movable clamping part in such a way that a force is exerted on the movable clamping part by the change of the volume from the hollow body, which force is referred to below as clamping partial force. On the gripper head also a return means is present, which is also in connection with the movable clamping part. The return means is preferably designed as a spring. The Restoring force of the restoring means counteracts the movable clamping part of the clamping part force, which is exerted by the increase in volume of the first hollow body on the movable clamping part.

Erfindungsgemäß ist ein zweiter Hohlkörper am Greiferkopf angebracht, in dem ein Innendruck des gleichen bereits erwähnten Mediums erzeugbar ist. Zur Erzeugung dieses Innendrucks sind Mittel vorhanden, mit denen auf den zweiten Hohlkörper eine äußere Kraft derartig aufbringbar ist, dass sie eine Veränderung d.h. eine Verringerung des Volumens des zweiten Hohlkörpers bewirkt. Eine derartig wirkende Kraft wird im Folgenden als Steuerkraft bezeichnet.According to the invention, a second hollow body is mounted on the gripper head, in which an internal pressure of the same medium already mentioned can be generated. To generate this internal pressure, there are means with which an external force can be applied to the second hollow body in such a way that it causes a change, i. causes a reduction in the volume of the second hollow body. Such a force is hereinafter referred to as a control force.

Am erfindungsgemäßen Greiferkopf ist außerdem ein Ventil angebracht ist. Dieses Ventil ist derartig mit dem ersten und dem zweiten Hohlkörper verbunden, dass durch Öffnen des Ventils ein Druckausgleich zwischen den beiden Hohlkörpern stattfinden kann. Dabei wird das gasförmige Medium vom einen zum anderen Hohlkörper geleitet.On the gripper head according to the invention, a valve is also attached. This valve is connected to the first and the second hollow body in such a way that a pressure equalization between the two hollow bodies can take place by opening the valve. The gaseous medium is passed from one to the other hollow body.

Solange das Ventil geschlossenen ist, kann das gasförmige Medium aus dem ersten Hohlkörper nicht entweichen. Ein im ersten Hohlkörper vorhandener Innendruck und die dadurch verursachte Klemmteilkraft bleiben aufrecht erhalten. Am Ventil ist außerdem ein Mittel zum Schließen angebracht ist. Durch das Schließmittel wird eine Schließkraft erzeugt, die solchen Kräften entgegenwirkt, durch die das Ventil geöffnet wird. Vorzugsweise ist dazu im Ventil ein beweglicher Ventilkörper vorhanden, an dem zum Beispiel ein als Ventilfeder ausgebildetes Schließmittel angreift. Der Ventilkörper wird dadurch gegen einen Ventilsitz gedrückt, sodass eine Öffnung, über die das gasförmige Medium durch das Ventil geleitet wird, verschlossen bleibt.As long as the valve is closed, the gaseous medium from the first hollow body can not escape. An internal pressure present in the first hollow body and the clamping partial force caused thereby remain intact. The valve is also a means for closing is attached. By the closing means, a closing force is generated which counteracts forces by which the valve is opened. For this purpose, a movable valve body is preferably provided in the valve, on which, for example, a closing means designed as a valve spring engages. The valve body is thereby pressed against a valve seat, so that an opening through which the gaseous medium is passed through the valve, remains closed.

In einer vorteilhaften Ausführungsform der erfindungsgemäßen Greiferkopfs sorgt eine vom Konstrukteur passend zu wählende Dimensionierung des Schließmittel - z.B. einer Ventilfeder dafür, dass das Ventil geschlossen bleibt, solange der auf den Ventilkörper wirkende Druck des gasförmigen Mediums bestimmte Werte nicht überschreitet. Das Schließmittel kann auch als elastisch verformbare Membran im Ventil ausgebildet sein.In an advantageous embodiment of the rapier head according to the invention, a dimensioning of the closing means - e.g. a valve spring, that the valve remains closed, as long as the acting on the valve body pressure of the gaseous medium does not exceed certain values. The closing means can also be designed as an elastically deformable membrane in the valve.

Erfindungsgemäß ist das Ventil derartig ausgebildet ist, dass es durch berührungslose Übertragung von Signalen oder Kräften betätigbar, das heißt zu Öffnen oder zu Schließen ist.According to the invention, the valve is designed such that it can be actuated by non-contact transmission of signals or forces, that is to open or close.

Bevorzugt ist eine Ausführung, bei der außerhalb des Greiferkopfs erzeugte magnetische Kräfte auf den Ventilkörper einwirken.Preferred is an embodiment in which magnetic forces generated outside of the rapier head act on the valve body.

Denkbar sind jedoch auch andere, komplexere Ventilssysteme, die z.B. durch hochfrequente elektromagnetische Funksignale ansteuerbar sind.However, other more complex valve systems are also conceivable, e.g. be controlled by high-frequency electromagnetic radio signals.

Der erfindungsgemäße Greiferkopf kann sowohl als Bringer-Greiferkopf als auch als Holer-Greiferkopf ausgeführt werden.The gripper head according to the invention can be designed both as a Bringer rapier head and as a Holer rapier head.

In einer vorteilhaften Ausführungsform des Bringer-Greiferkopfes wird durch die Klemmteilkraft, die der erste Hohlkörper unter Innendruck auf das bewegliche Klemmteil ausübt, die Fadenklemme geschlossen. Das bewegliche Klemmteil wird auf das feststehende Klemmteil gedrückt. Wenn die Klemmteilkraft nachlässt, wird bei dieser Ausführungsform des Bringer-Greiferkopfes die Fadenklemme geöffnet, weil die Rückstellkraft, die auf das bewegliche Klemmteil wirkt, der Klemmteilkraft entgegenwirkt.In an advantageous embodiment of the Bringer rapier head, the thread clamp is closed by the clamping part force which exerts the first hollow body under internal pressure on the movable clamping part. The movable clamping part is pressed onto the fixed clamping part. When the clamping part force decreases, in this embodiment of the Bringer rapier head, the thread clamp is opened, because the restoring force acting on the movable clamping part counteracts the clamping part force.

In einer Ausführung als Holer-Greiferkopf erweist es sich als vorteilhaft, wenn das Rückstellmittel, das bewegliche Klemmteil und der erste Hohlkörper derartig angeordnet werden, das die Wirkung der Kräfte im Vergleich zum Bringer-Greiferkopf umgekehrt ist: Die Fadenklemme wird mittels der Rückstellkraft geschlossen, indem die beiden Klemmteile der Fadenklemme aufeinander gedrückt werden und durch die Klemmteilkraft des ersten Hohlkörpers wird die Fadenklemme geöffnet.In an embodiment as Holer gripper head, it proves to be advantageous if the return means, the movable clamping member and the first hollow body are arranged such that the effect of the forces in relation to the Bringer rapier head is reversed: The thread clamp is closed by means of the restoring force, in that the two clamping parts of the thread clamp are pressed against one another and the thread clamp is opened by the clamping part force of the first hollow body.

Das Aufbringen der äußeren Steuerkraft auf den zweiten Hohlkörper des Greiferkopfes erfolgt in einer weiteren Ausführungsform des erfindungsgemäßen Greiferkopfes mittels eines Steuerhebels. Dieser ist am Greiferkopf derartig angebracht, dass damit Steuerkräfte auf den zweiten Hohlkörper aufgebracht werden können, die eine Verringerung seines Volumens, also Innendruck erzeugen. Der Steuerhebel kann gelenkig oder elastisch im Greiferkopf gelagert sein. Er kann in vorteilhafter Weise eine Steuerfläche aufweisen, über die von außerhalb des Greiferkopfes eine Kraft auf den Steuerhebel aufgebracht werden kann. Die Anordnung ist so gestaltet, dass dies auch dann möglich ist, wenn der Greiferkopf in Bewegung ist.The application of the external control force on the second hollow body of the gripper head takes place in a further embodiment of the gripper head according to the invention by means of a control lever. This is attached to the gripper head in such a way that control forces can be applied to the second hollow body, which produce a reduction in its volume, ie internal pressure. The control lever can be articulated or elastically mounted in the gripper head. It can advantageously have a control surface over which a force can be applied to the control lever from outside the gripper head. The arrangement is designed so that this is possible even when the gripper head is in motion.

Die erfindungsgemäßen Greifer sind zur Verwendung in einer Greiferwebmaschine vorgesehen. Diese Greiferwebmaschine enthält in einer vorteilhaften Weiterbildung der Erfindung eine Ventilöffnungseinrichtung zum berührungslosen Öffnen des Ventils im Greiferkopf. Dazu sind ein oder mehrere Aktuatoren vorgesehen. Damit ist das am Greiferkopf angebrachte Ventil betätigbar. Erfindungsgemäß ist ein Aktuator vorgesehen, der beim Betätigen des Ventils mit dem Greiferkopf nicht in Berührung kommen. Das kann zum Beispiel ein Elektromagnet sein, der von einer elektronischen Steuerung der Greiferwebmaschine bedarfsgerecht zu bestimmten Zeitpunkten im Webzyklus angesteuert wird. Dies kann auch während der Bewegung des Greiferkopfes durch das Webfach der Greiferwebmaschine erfolgen. Der Aktuator wird vorteilhaft im Bereich der Laufbahn des Greiferkopfes angebracht also zum Beispiel unterhalb der Laufbahn, über die auch die Kettfäden in der Webmaschine geführt werden. Die Anbringungs kann in der Maschinenmitte aber auch außerhalb des Gewebeverlaufs bzw. des Webfachs an den Seiten der Maschine sein. Durch geeignete Wahl der Anzahl und Anordnung der Aktuatoren ist ein Öffnen und Schließen von Bringer- und Holer-Greiferkopf bei der Fadenübergabe möglich.The grippers according to the invention are intended for use in a rapier weaving machine. This rapier loom contains in an advantageous development the invention, a valve opening device for non-contact opening of the valve in the gripper head. For this purpose, one or more actuators are provided. Thus, the attached to the gripper head valve can be actuated. According to the invention, an actuator is provided which does not come into contact with the gripper head when the valve is actuated. This may be, for example, an electromagnet, which is controlled by an electronic controller of the rapier as needed at certain times in the weaving cycle. This can also take place during the movement of the rapier head through the shed of the rapier loom. The actuator is advantageously mounted in the region of the track of the gripper head so for example below the track over which the warp threads are guided in the weaving machine. The attachment can be in the middle of the machine but also outside the course of the fabric or the shed on the sides of the machine. By a suitable choice of the number and arrangement of the actuators opening and closing of Bringer and Holer rapier head in the yarn transfer is possible.

Weiterhin enthält die Greiferwebmaschine mit erfindungsgemäßen Greiferköpfen mindestens eine Steuereinrichtung, mit der zu bestimmten Zeitpunkten im Webzyklus eine Steuerkraft über eine Steuerschiene ggf. über einen Steuerhebel auf den zweiten Hohlkörper aufbringbar ist, wodurch die Verkleinerung des Volumens und damit der Innendruck im zweiten Hohlkörper entsteht.Furthermore, the gripper loom with rapier heads according to the invention contains at least one control device with which at certain times in the weaving cycle, a control force via a control rail via a control lever on the second hollow body can be applied, whereby the reduction of the volume and thus the internal pressure in the second hollow body is formed.

Diese Kraft ist durch die konstruktive Ausführung oder durch Einstellungen des Bedieners im vorhinein festlegbar. Sie kann sogar auch während des Webbetriebs veränderbar sein. Zu diesem Zweck ist in einer vorteilhaften Ausführungsform der Erfindung die Steuereinrichtung mit elektromechanischen oder pneumatischen Mitteln zur Veränderung der Steuerkraft bzw. des Steuerhubs ausgerüstet.This force can be determined in advance by the structural design or by the settings of the operator. It can even be changeable during weaving operation. For this purpose, in an advantageous embodiment of the invention, the control device is equipped with electromechanical or pneumatic means for varying the control force or the control stroke.

Das funktionelle Zusammenwirken der Greiferwebmaschine mit den Greiferköpfen wird im Folgenden am Beispiel eines Bringer-Greiferkopf erläutert. Das ist der Geiferkopf, der den Schussfaden außerhalb des Webfachs aufnimmt und bis zur Maschinenmitte der Greiferwebmaschine bringt, wo der Schussfaden an einen Holer-Greiferkopf übergeben wird.The functional interaction of rapier loom with the gripper heads will be explained below using the example of a Bringer rapier head. This is the drover head, which picks up the weft thread outside the shed and brings it to the machine center of the rapier loom, where the weft thread is transferred to a holer rapier head.

Wenn der Bringer-Greiferkopf im Webbetrieb in einer Position außerhalb des Webfachs seine Bewegung in Richtung auf die Eingangsseite des Webfachs beginnt, ist der erste Hohlkörper zur Betätigung des beweglichen Klemmteils noch ohne erhöhten Innendruck und das bewegliche Klemmteil wird von dem Klemmstellmittel offen gehalten.When the bringer rapier head in a weaving operation in a position outside the shed its movement towards the input side of the shed begins, the first hollow body for actuating the movable clamping member is still without increased internal pressure and the movable clamping member is held open by the clamping adjusting means.

In der Position des Bringer-Greiferkopfs, in der der Schussfaden aufgenommen werden soll, wird die an der Greiferwebmaschine vorhandene Steuereinrichtung derartig betätigt, dass in dem zweiten Hohlkörper am Bringer-Greiferkopf ein Innendruck entsteht.In the position of the bringer rapier head in which the weft thread is to be received, the control device present on the rapier loom is actuated such that an internal pressure is produced in the second hollow body on the bringer rapier head.

Bei Überschreiten einer bestimmten Größe dieses Innendrucks wird das Ventil durch die im zweiten Hohlkörper komprimierte Druckluft entgegen der am Ventilkörper angreifenden Schließkraft geöffnet.When a certain size of this internal pressure is exceeded, the valve is opened by the compressed in the second hollow body compressed air against the closing force acting on the valve body.

Die im zweiten Hohlkörper komprimierte Luft strömt über das Ventil und eine Druckluftleitung in den ersten Hohlkörper. Dadurch entsteht in diesem ein Innendruck, der das Volumen des ersten Hohlkörpers vergrößert, sodass auf das bewegliche Klemmteil eine Kraft ausgeübt wird. Diese Klemmteilkraft führt dazu, dass das bewegliche Klemmteil entgegen der Rückstellkraft des Rückstellmittels auf das feststehende Klemmteil gedrückt wird, sodass der Schussfaden mit einer aus Klemmteilkraft und Rückstellkraft resultierenden Haltekraft geklemmt wird. Anschließend gelangt der Bringer-Greiferkopf durch seine Vorwärtsbewegung aus dem Arbeitsbereich der Steuereinrichtung. Natürlich kann die Steuereinrichtung auch derartig betätigt werden, dass schon vorher keine Steuerkraft mehr auf den zweiten Hohlkörper wirkt. In beiden Fällen wird dieser nun drucklos. Die Ventilfeder ist so dimensioniert, dass das Ventil geschlossen bleibt und der Innendruck in dem ersten Hohlkörper zur Betätigung des beweglichen Klemmteils erhalten bleibt. Somit kann der geklemmte Schussfaden bis zur Position Fadenübergabe an den Holer-Greiferkopf in Maschinenmitte transportiert werden.The air compressed in the second hollow body flows via the valve and a compressed air line into the first hollow body. This results in an internal pressure, which increases the volume of the first hollow body, so that a force is exerted on the movable clamping part. This clamping part force causes the movable clamping part is pressed against the restoring force of the return means on the fixed clamping part, so that the weft thread is clamped with a resulting clamping force and restoring force retaining force. Subsequently, the Bringer rapier head passes through its forward movement from the working area of the control device. Of course, the control device can also be actuated in such a way that no control force acts on the second hollow body before. In both cases this will now be depressurized. The valve spring is dimensioned so that the valve remains closed and the internal pressure in the first hollow body is maintained for actuating the movable clamping part. Thus, the clamped weft yarn can be transported to the position thread transfer to the Holer gripper head in the machine center.

Zur Übergabe des Schussfadens an den Holer-Greiferkopf wird das Ventil von einem weiteren in Maschinenmitte angebrachten Aktuator geöffnet. Das geschieht ohne Berührung zwischen Aktuator und Greiferkopf. Es findet somit kein mechanischer Verschleiß zwischen den beteiligten Bauteilen statt. Die komprimierte Luft im ersten Hohlkörper zur Betätigung des beweglichen Klemmteils entweicht nun über die Druckluftleitung und das Ventil in den zu diesem Zeitpunkt drucklosen zweiten Hohlkörper. Infolgedessen wird das bewegliche Klemmteil durch die Rückstellkraft des Rückstellmittels vom feststehenden Klemmteil gelöst und die Fadenklemme wird geöffnet. Der Schussfaden kann jetzt vom Holer-Greiferkopf übernommen werden. Der Bringer-Greiferkopf bewegt sich danach mit geöffneter Fadenklemme aus dem Webfach und der Webzyklus wiederholt sich.To transfer the weft thread to the holer rapier head, the valve is opened by another actuator mounted in the center of the machine. This happens without contact between actuator and rapier head. There is thus no mechanical wear between the components involved. The compressed air in the first hollow body for actuating the movable clamping part now escapes via the compressed air line and the valve in the second hollow body which is unpressurized at this time. As a result, the movable clamping member is released by the restoring force of the return means of the fixed clamping member and the Thread clamp is opened. The weft thread can now be taken over by the holer gripper head. The Bringer rapier head then moves out of the shed with the thread clamp open and the weaving cycle is repeated.

Es gibt auch Maschinenausführungen, bei denen der Bringer-Greiferkopf den Schussfaden nicht an einen Holer-Greiferkopf übergibt, sondern durch das ganze Webfach transportiert. Der beschriebene Ablauf ist dann sinngemäß anwendbar. Der Aktuator der Ventilöffnungseinrichtung wird in so einem Fall nicht in Maschinenmitte sondern auf der Ausgangsseite des Webfachs der Greiferwebmaschine angebracht.There are also machine versions, in which the Bringer rapier head does not pass the weft thread to a Holer gripper head, but transported through the entire shed. The procedure described is then applicable mutatis mutandis. The actuator of the valve opening device is mounted in such a case not in the machine center but on the output side of the shed of the rapier.

In weiteren Ausführungsformen der Erfindung können die Rückstellmittel beispielsweise als Zugfeder als Druckfeder oder als Biegefeder ausgebildet sein. Auch pneumatische oder magnetisch wirkende Federelemente sowie Kombinationen zwischen Federn und Magneten sind als Ausführungsformen der Rückstellmittel denkbar.In further embodiments of the invention, the return means may be formed for example as a tension spring as a compression spring or as a bending spring. Also pneumatic or magnetically acting spring elements and combinations between springs and magnets are conceivable as embodiments of the return means.

Die Erzeugung der Steuerkraft durch die Steuereinrichtung kann beispielsweise auch über eine feststehend Kulisse bzw. Steuerschiene erfolgen. Der zweite Hohlkörper und/oder der Steuerhebel im Greiferkopf weisen dabei eine entsprechende Steuer- oder Anlauffläche auf, die bei der Bewegung des Greiferkopfes gegen die feststehende Steuerschiene anläuft, sodass von der Steuerschiene eine Kraft auf die Anlauffläche ausgeübt wird, ohne das eine aktiv gesteuerte Bewegung der Steuerschiene in Richtung auf den Greiferkopf erfolgt.The generation of the control force by the control device can for example also take place via a fixed slide or control rail. The second hollow body and / or the control lever in the gripper head in this case have a corresponding control or contact surface, which starts against the fixed control rail during the movement of the gripper head, so that a force is exerted on the contact surface by the control rail, without an actively controlled movement the control rail takes place in the direction of the gripper head.

Die Hohlkörper, deren Volumenveränderungen in Beziehung zu einer nach außen oder von außen wirkenden Kraft stehen, werden vorzugsweise als expandierbarer Balg oder auch als Pneumatikzylinder ausgebildet. Bei Verwendung eines expandierbaren Balgs als Hohlkörper enthält dieser Balg meist durch seine Elastizität bereits ein Rückstellmittel, das eine Rückstellkraft über die Kontaktfläche zwischen Balg und beweglichem Klemmteil aufbringt. Es kann aber auch im Balg oder im Pneumatikzylinder eine Rückstellfeder als separates Bauteil integriert sein. Statt elektronisch angesteuerter Elektromagnete können als Aktuatoren auch stationäre Dauermagnete eingesetzt werden, die das Ventil im Greiferkopf zu dem Zeitpunkt öffnen, zu dem der Greiferkopf daran vorbeibewegt wird. Auch eine Kombination aus Dauermagnet und elektrisch ansteuerbarer Magnetspule ist möglich.The hollow bodies, whose volume changes are related to an outwardly or externally acting force, are preferably formed as an expandable bellows or as a pneumatic cylinder. When using an expandable bellows as a hollow body of this bellows usually contains by its elasticity already a return means that applies a restoring force on the contact surface between the bellows and the movable clamping part. But it can also be integrated in the bellows or in the pneumatic cylinder, a return spring as a separate component. Instead of electronically controlled electromagnets as stationary stationary permanent magnets can be used, which open the valve in the gripper head at the time when the gripper head is moved past it. A combination of permanent magnet and electrically controllable magnetic coil is possible.

Die Erfindung wird im folgenden an Hand von Ausführungsbeispielen im Detail erläutert.

Figur 1
Perspektivische Ansicht einer ersten Ausführungsform des erfindungsgemäßen Greiferkopfes als Bringer-Greiferkopf mit Ventilöffnungseinrichtung und Steuereinrichtung.
Figur 2
Ansicht von oben der Ausführungsform gemäß Fig. 1
Figur 3
Schnittansicht A - A der Ausführungsform gemäß Fig. 1, geöffnete Fadenklemme, Position des Greiferkopfs außerhalb des Webfachs.
Figur 4
Schnittansicht gemäß Fig. 3, Betätigung durch Steuereinrichtung, Fadenklemme geschlossen
Figur 5
Schnittansicht der Ausführungsform gemäß Fig. 1, Greiferkopf in Maschinenmitte, Ventil durch Ventilöffnungseinrichtung geöffnet, Fadenklemme geöffnet.
Figur 6
Perspektivische Ansicht einer Ausführungsform des erfindungsgemäßen Greiferkopfes als Holer-Greiferkopf mit Ventilöffnungseinrichtung und Steuereinrichtung.
Figur 7
Ansicht von oben der Ausführungsform gemäß Fig. 6
Figur 8
Schnittansicht B - B der Ausführungsform gemäß Fig. 6, Greiferkopf im Webfach, Fadenklemme geöffnet.
Figur 9
Schnittansicht der Ausführungsform gemäß Fig. 6, Greiferkopf in Maschinenmitte, Ventilöffnungseinrichtung öffnet Ventil, Fadenklemme schließt.
Figur 10
Schnittansicht der Ausführungsform gemäß Fig. 6, Greiferkopf in Position außerhalb des Webfachs, mit Steuereinrichtung, Fadenklemme öffnet.
Figur 11
Schnittansicht einer weiteren Ausführungsform des Bringer-Greiferkopfs mit anderer Ventilanordnung; Bringer-Greiferkopf in Außenposition bei Fadenaufnahme, Fadenklemme schließt.
Figur 12
Weitere Schnittansicht der Ausführung gemäß Fig. 11; Bringer-Greiferkopf in Maschinenmitte bei Übergabe an Holfer-Greiferkopf; Aktuator öffnet Ventil; Rückstellfeder öffnet Fadenklemme.
The invention will be explained below with reference to exemplary embodiments in detail.
FIG. 1
Perspective view of a first embodiment of the gripper head according to the invention as Bringer rapier head with valve opening device and control device.
FIG. 2
View from above of the embodiment according to Fig. 1
FIG. 3
Section view A - A of the embodiment according to Fig. 1 , open thread clamp, position of the hook head outside the shed.
FIG. 4
Section view according to Fig. 3 , Operation by control device, thread clamp closed
FIG. 5
Section view of the embodiment according to Fig. 1 , Gripper head in center of machine, valve open by valve opening device, thread clamp open.
FIG. 6
Perspective view of an embodiment of the gripper head according to the invention as Holer gripper head with valve opening device and control device.
FIG. 7
View from above of the embodiment according to Fig. 6
FIG. 8
Section view B - B of the embodiment according to Fig. 6 , Gripper head in the shed, thread clamp open.
FIG. 9
Section view of the embodiment according to Fig. 6 , Gripper head in center of machine, valve opening device opens valve, thread clamp closes.
FIG. 10
Section view of the embodiment according to Fig. 6 , Gripper head in position outside the shed, with control device, thread clamp opens.
FIG. 11
Section view of another embodiment of the Bringer rapier head with another valve assembly; Bringer rapier head in outer position with thread take-up, thread clamp closes.
FIG. 12
Further sectional view of the embodiment according to Fig. 11 ; Bringer rapier head in the middle of the machine on transfer to Holfer rapier head; Actuator opens valve; Return spring opens thread clamp.

Die Figuren 1 bis 3 zeigen verschiedene Ansichten einer ersten Ausführungsform des erfindungsgemäßen Greiferkopfes als Bringer-Greiferkopf 1. Dieser nimmt den Schussfaden 2 außerhalb des Webfachs auf und trägt ihn bis in Maschinenmitte. Der Bringer-Greiferkopf 1 besteht aus einem Grundkörper in Form eines U-Profils. Zum Befestigen des U-Profils zum Beispiel an einer Greiferstange sind an einem Ende des Grundkörpers Bohrungen vorgesehen, die für eine Verschraubung benutzt werden. Am anderen Ende des Grundkörpers befinden sich das feststehende Klemmteil 4 einer Fadenklemme 3, sowie eine Führungskontur für den Schussfaden 2. Zwischen Fadenklemme 3 und Führungskontur wird bei der Aufnahme eines Schussfadens 2 ein Schussfadenabschnitt gebildet. Das bewegliche Klemmteil 5 der Fadenklemme 3 ist als Klemmhebel mit zwei Hebelarmen ausgebildet. Zwischen den beiden Hebelarmen befindet sich eine Drehachse, über die das bewegliche Klemmteil 5 im Grundkörper drehbar gelagert ist. Am vorderen, der Greiferspitze näher liegenden Hebelarm des beweglichen Klemmteils 5 ist eine Klemmbacke in bekannter Art und Weise angebracht. Je nach Schussfadenart sind natürlich auch Ausführungen ohne Klemmbacke möglich. Am hinteren der Greiferspitze abgewandten Hebelarm des beweglichen Klemmteils 5 befindet sich eine Kontaktfläche über die das bewegliche Klemmteil 5 mit einem ersten Hohlkörper 6 in Verbindung steht. Dieser Hohlkörper 6 ist als expandierbarer Balg ausgebildeten, der am Grundkörper des Bringer-Greiferkopfes 1 angebracht ist.The FIGS. 1 to 3 show various views of a first embodiment of the gripper head according to the invention as Bringer rapier head 1. This takes up the weft yarn 2 outside of the shed and carries him to the machine center. The Bringer rapier head 1 consists of a base body in the form of a U-profile. For fastening the U-profile, for example, on a rapier bar holes are provided at one end of the base body, which are used for a screw connection. At the other end of the body are the fixed clamping part 4 of a thread clamp 3, and a guide contour for the weft thread 2. Between thread clamp 3 and guide contour, a weft thread portion is formed when receiving a weft yarn 2. The movable clamping part 5 of the thread clamp 3 is designed as a clamping lever with two lever arms. Between the two lever arms there is an axis of rotation, via which the movable clamping part 5 is rotatably mounted in the base body. At the front, the hook tip closer lever arm of the movable clamping member 5, a jaw is mounted in a known manner. Depending on the type of weft thread, versions without a jaw are also possible. At the rear of the hook tip remote lever arm of the movable clamping member 5 is a contact surface on which the movable clamping member 5 with a first hollow body 6 is in communication. This hollow body 6 is formed as an expandable bellows, which is attached to the main body of the Bringer rapier head 1.

Um den Schussfaden 2 zwischen dem beweglichen Klemmteil 5 und dem feststehenden Klemmteil 4 zu klemmen, wird das bewegliche Klemmteil 5 um seine Drehachse im Uhrzeigersinn verschwenkt. Dies geschieht durch eine Kraft, die vom Balg 6 auf den der Greiferspitze abgewandten Hebelarm des beweglichen Klemmteils 5 wirkt.In order to clamp the weft thread 2 between the movable clamping part 5 and the fixed clamping part 4, the movable clamping part 5 is pivoted about its axis of rotation in the clockwise direction. This is done by a force acting from the bellows 6 on the lever tip of the movable clamping part 5 facing away from the hook tip.

Beim Transport des Schussfadens 2 in das Webfach der Greiferwebmaschine wird der Schussfaden 2 im Bringer-Greiferkopf 1 in der Fadenklemme 3 und in der bereits erwähnten Führungskontur gehalten. Die zur Spitze des Bringer-Greiferkopfes 1 hin geöffnete Führungskontur wird während der Bewegung des Greifers durch das Webfach durch einen Abdeckhebel 15 zur Spitze hin abgedeckt. Damit wird verhindert, dass Kettfäden, die im Webfach quer zur Laufrichtung des Bringer-Greiferkopfes 1 verlaufen, von der Führungskontur auf unerwünschte Weise erfasst werden. Damit jedoch in der Position des Bringer-Greiferkopfes 1 außerhalb des Webfachs der einzutragende Schussfaden 2 in der gewünschten Art und Weise von der Führungskontur erfasst werden kann, ist der Abdeckhebel 15 drehbar im Grundkörper gelagert. Im vorliegenden Ausführungsbeispiel ist die Drehachse kongruent mit der Drehachse des beweglichen Klemmteils 5. Bewegliches Klemmteil 5 und Abdeckhebel 15 sind so miteinander verbunden, dass eine Drehbewegung des beweglichen Klemmteils 5 auch eine Drehbewegung des Abdeckhebels 15 bewirkt.When transporting the weft thread 2 into the shed of the rapier weaving machine, the weft thread 2 is held in the bringer rapier head 1 in the thread clamp 3 and in the already mentioned guide contour. The guide contour which is open towards the tip of the rapier-rapier head 1 is covered by the gripper during the movement of the gripper through a cover lever 15 towards the tip. This prevents that warp threads that run in the shed transverse to the direction of the bringer rapier head 1, are detected by the guide contour in an undesirable manner. However, in order to be recorded in the desired manner of the guide contour in the desired manner of the guide contour in the position of the bringer rapier head 1 outside of the shed, the cover 15 is rotatably mounted in the body. In the present embodiment, the axis of rotation is congruent with the axis of rotation of the movable clamping member 5. Movable clamping member 5 and cover lever 15 are connected together so that a rotational movement of the movable clamping member 5 causes a rotational movement of the cover lever 15.

An einem Verbindungssteg zwischen dem Abdeckhebel 15 und dem der Greiferspitze abgewandten Hebelarm des beweglichen Klemmteils 5 ist das obere Ende einer als Rückstellmittel wirkenden Rückstellfeder 7 befestigt. Das untere Ende der Rückstellfeder 7 ist am Grundkörper des Bringer-Greiferkopfes 1 angebracht. Die Rückstellfeder 7 ist auf Zug vorgespannt, sodass ohne das Einwirken weiterer Kräfte das bewegliche Klemmteil 5 zusammen mit dem Abdeckhebel 15 gegen den Uhrzeigersinn gedreht und damit die Fadenklemme 3 geöffnet wird. Erst wenn die Klemmteilkraft, die vom Balg 6 auf das bewegliche Klemmteil 5 wirkt, auf dieses ein größeres Drehmoment ausübt als die Federkraft der Rückstellfeder 7, wird die Fadenklemme 3 geschlossen.At a connecting web between the cover lever 15 and the lever tip of the movable clamping part 5 facing away from the hook tip, the upper end of a restoring spring 7 acting as a return means is fastened. The lower end of the return spring 7 is attached to the main body of the Bringer rapier head 1. The return spring 7 is biased to train, so rotated without the action of other forces, the movable clamping member 5 together with the cover 15 counterclockwise and thus the thread clamp 3 is opened. Only when the clamping part force acting from the bellows 6 on the movable clamping member 5, this exerts a greater torque than the spring force of the return spring 7, the thread clamp 3 is closed.

Der expandierbare Balg 6 ist im vorliegenden Ausführungsbeispiel in der der Greiferspitze zu gewandten vorderen Hälfte des Bringer-Greiferkopfes 1 angebracht. Dieser Balg 6 weist an seinem oberen Ende eine Kontaktfläche zum beweglichen Klemmteil 5 auf. Das untere Ende ist am Grundkörper des Bringer-Greiferkopfes 1 befestigt und weist eine Druckluftöffnung auf, über die Druckluft in den Balg 6 eingeleitet werden kann. Mittels der Einleitung von Druckluft wird im Balg 6 ein Innendruck erzeugt, der zu einer Volumenvergrößerung des Balgs 6 führt. Diese Volumenvergrößerung bewirkt die Klemmteilkraft, die vom Balg 6 auf den Hebelarm des als Klemmhebel ausgebildeten beweglichen Klemmteils 5 ausgeübt wird.The expandable bellows 6 is attached in the present embodiment in the gripper tip facing to the front half of the Bringer rapier head 1. This bellows 6 has at its upper end a contact surface to the movable clamping part 5. The lower end is fixed to the main body of the Bringer rapier head 1 and has a compressed air opening, can be introduced via the compressed air into the bellows 6. By means of the introduction of compressed air, an internal pressure is generated in the bellows 6, which leads to an increase in volume of the bellows 6. This increase in volume causes the clamping part force which is exerted by the bellows 6 on the lever arm of the movable clamping part 5 designed as a clamping lever.

Um Druckluft in den ersten Balg 6 einzuleiten, ist im vorliegenden Ausführungsbeispiel eine Druckluftleitung vorgesehen. Diese Druckluftleitung verbindet den ersten Balg 6 mit dem erfindungsgemäßen zweiten Hohlkörper 8. Dieser zweite Hohlkörper 8 ist ebenfalls als expandierbarer Balg ausgeführt. Dieser ist in der hinteren, der Greiferspitze ab gewandten Hälfte des Bringer-Greiferkopfes 1 angebracht und weist ebenfalls ein Kontaktfläche auf der Oberseite und eine Druckluftöffnung auf der Unterseite auf.In order to introduce compressed air into the first bellows 6, a compressed air line is provided in the present embodiment. This compressed air line connects the first bellows 6 with the second hollow body 8 according to the invention. This second hollow body 8 is likewise designed as an expandable bellows. This is mounted in the rear, the hook tip from facing half of the Bringer rapier head 1 and also has a contact surface on the top and a compressed air port on the bottom.

Zwischen der Druckluftöffnung des zweiten Balgs 8 und der Druckluftleitung ist ein Ventil 9 vorgesehen, durch das im geöffneten Zustand eine Verbindung zwischen den beiden Hohlkörpern 6, 8 derartig hergestellt wird, dass Druckluft von einem in den anderen Hohlkörper überströmen kann.Between the compressed air opening of the second bellows 8 and the compressed air line, a valve 9 is provided, through which in the opened state, a connection between the two hollow bodies 6, 8 is made such that compressed air can flow from one to the other hollow body.

Das Ventil 9 ist im vorliegenden Beispiel als Rückschlagventil ausgebildet, das aus einem Ventilkörper und einer als Schließmittel wirkenden Ventilfeder 10 besteht. Diese Elemente sind in einem Druckluft führenden Ventilgehäuse angeordnet.The valve 9 is formed in the present example as a check valve, which consists of a valve body and acting as a closing means valve spring 10. These elements are arranged in a compressed air-conducting valve housing.

Das Ventilgehäuse ist mit dem Grundkörper des Bringer-Greiferkopfes 1 verbunden. Der Ventilkörper ist im Ventilgehäuse vertikal beweglich. Die Ventilfeder 10 ist derartig montiert und vorgespannt, dass die Schließkraft der Ventilfeder den Ventilkörper mit seiner oberen Begrenzungsfläche gegen den Ausgang der Druckluftöffnung am unteren Ende des zweiten Balgs 8 drückt; dadurch wird das Ventil 9 geschlossen gehalten.The valve housing is connected to the main body of the Bringer rapier head 1. The valve body is vertically movable in the valve housing. The valve spring 10 is mounted and biased such that the closing force of the valve spring pushes the valve body with its upper boundary surface against the outlet of the compressed air opening at the lower end of the second bellows 8; As a result, the valve 9 is kept closed.

Die Kontaktfläche auf der Oberseite des zweiten Balgs 8 steht mit dem einen Ende eines Steuerhebels 11 in Verbindung, dessen anderes Ende im Bringer -Greiferkopf 1 gelagert ist. Diese Lagerung erfolgt im vorliegenden Beispiel über eine Drehachse in der vorderen Hälfte des Bringer-Greiferkopfes 1. Der Steuerhebel 11 weist auf einer Oberseite eine Steuerfläche auf, über die von außerhalb des Bringer-Greiferkopfs 1 mittels Elementen der Steuereinrichtung eine Kraft und damit eine Drehbewegung entgegen dem Uhrzeigersinn auf den Steuerhebel 11 aufgebracht werden kann. Unterhalb des Steuerhebels 11 ist eine Steuerhebelfeder am Grundkörper des Bringer-Greiferkopfes 1 angebracht. Im vorgespannten Zustand bewirkt die Federkraft dieser Steuerhebelfeder eine Drehbewegung des Steuerhebels 11 im Uhrzeigersinn. Die Steuerhebelfeder könnte in einer anderen Ausführung auch innerhalb des zweiten Balgs 8 derartig angeordnet sein, dass sie die obere Kontaktfläche mit dem Ende des Steuerhebels 11 nach oben drückt. Der Steuerhebel und der zweite Balg 8 werden dadurch zurückgestellt. Denkbar sind natürlich auch an dieser Stelle Mittel zum Rückstellen, die analog zu den weiter oben geschilderten verschiedenen Ausführungsmöglichkeiten der Rückstellmittel 7 für das bewegliche Klemmteil 5 ausgeführt sind.The contact surface on the upper side of the second bellows 8 is connected to one end of a control lever 11 in connection, the other end in the Bringer gripper head 1 is stored. This control is carried out in the present example via a rotation axis in the front half of the bringer rapier head 1. The control lever 11 has on a top on a control surface, on the outside of the bringer rapier head 1 by means of elements of the control device against a force and thus a rotational movement can be applied clockwise to the control lever 11. Below the control lever 11, a control lever spring on the main body of the Bringer rapier head 1 is mounted. In the prestressed state, the spring force of this control lever spring causes a rotational movement of the control lever 11 in a clockwise direction. The control lever spring could be arranged in another embodiment, also within the second bellows 8 such that it pushes the upper contact surface with the end of the control lever 11 upwards. The control lever and the second bellows 8 are thereby reset. Conceivable, of course, at this point means for resetting, which are analogous to the above-described various embodiments of the return means 7 for the movable clamping member 5 are executed.

In der Ansicht der Figur 3 ist die Position des Bringer-Greiferkopfs 1 außerhalb des Webfachs zusammen mit einem Steuerelement z.B. einer Steuerschiene 14 der Steuereinrichtung dargestellt. Es besteht noch kein Kontakt zwischen Bringer-Greiferkopf 1 und Steuerschiene 14.In the view of FIG. 3 the position of the bringer rapier head 1 outside the shed is shown together with a control, for example a control rail 14 of the control device. There is still no contact between Bringer rapier head 1 and control rail 14th

Die Federkraft der Steuerhebelfeder wirkt einem Zusammendrücken des zweiten Balgs 8 entgegen. Der zweite Balg 8 ist innen mehr oder weniger drucklos bzw. hat Umgebungsdruck. Auch der erste Balg 6 ist drucklos und wird daher über die Rückstellfeder 7 und das bewegliche Klemmteil 5 zusammen gedrückt - sein Volumen ist verkleinert. In diesem Zustand sind die Fadenklemme 3 und der Abdeckhebel 15 geöffnet. Der als nächstes einzutragende Schussfaden 2 wird durch eine der üblichen Auswahleinrichtungen einer Greiferwebmaschine dem Bringer-Greiferkopf 1 quer zur Bewegungsrichtung des Greifers vorgelegt. Bei einer Vorwärtsbewegung des Bringer-Greiferkopfes 1 in Richtung auf seine Spitze bzw. in Richtung auf das Webfach wird der vorgelegte Schussfaden 2 von der Fadenklemme 3 und von der Führungskontur erfasst. Die Fadenklemme 3 muss nun geschlossen werden.The spring force of the control lever spring counteracts compression of the second bellows 8. The second bellows 8 is inside more or less pressureless or has ambient pressure. Also, the first bellows 6 is depressurized and is therefore pressed together via the return spring 7 and the movable clamping part 5 - its volume is reduced. In this state, the thread clamp 3 and the cover 15 are open. The weft yarn 2 to be introduced next is presented to the bringer rapier head 1 transversely to the direction of movement of the gripper by one of the usual selection devices of a rapier weaving machine. In a forward movement of the bringer rapier head 1 in the direction of its tip or in the direction of the shed, the presented weft thread 2 is detected by the thread clamp 3 and by the guide contour. The thread clamp 3 must now be closed.

Dies ist in Figur 4 dargestellt. Bei seiner Vorwärtsbewegung in Richtung auf das Webfach kommt der Bringer-Greiferkopf 1 in den Arbeitsbereich der Steuerschiene 14 der Steuereinrichtung. Die Steuerschiene 14 wird vertikal nach unten bewegt. Dazu ist ein nicht näher dargestellter Antrieb vorhanden, der zum Beispiel aus einer Kurvenscheibe und einem daran geführten Rollenhebel bestehen kann. Die Kurvenscheibe wird vom Hauptantrieb der Webmaschine angetrieben.This is in FIG. 4 shown. During its forward movement in the direction of the shed the Bringer rapier head 1 comes into the working area of the control rail 14 of the control device. The control rail 14 is moved vertically downwards. For this purpose, a non-illustrated drive is present, which may for example consist of a cam and a roller lever guided thereon. The cam is driven by the main drive of the loom.

Denkbar sind natürlich auch Anordnungen, bei denen die Kurvenscheibe von einem eigenen Motor angetrieben wird. Durch Verändern des Hebelarms am Rollenhebel sowie durch Befestigung der Steuerschiene 14 z.B. über Langlöcher können Hub und Position der Steuerschiene 14 in Bezug auf den Greiferkopf eingestellt werden. Aber auch Ausführungen mit Linearantrieb oder Pneumatikzylinder, bei denen die Steuerschiene 14 frei programmierbar linear in Richtung auf den Greiferkopf positionierbar ist, kommen in Frage.Conceivable, of course, arrangements in which the cam is driven by its own engine. By changing the lever arm on the roller lever and by attaching the control rail 14 e.g. Via slots, the stroke and position of the control rail 14 can be adjusted with respect to the gripper head. But also versions with linear drive or pneumatic cylinder, in which the control rail 14 is freely programmable linearly positioned in the direction of the gripper head, come into question.

Die Steuerschiene 14 der Steuereinrichtung kommt bei ihrer vertikalen Bewegung in Kontakt mit dem Steuerhebel 11 und drückt über diesen den zweiten Balg 8 zusammen. Das Volumen des Balgs 8 verkleinert sich und die darin befindliche Luft wird komprimiert. Es entsteht im Balg 8 ein erhöhter Innendruck. Bei Überschreiten eines bestimmten Innendrucks wird der Ventilkörper entgegen der Ventilfederkraft nach unten gedrückt - das Ventil 9 öffnet. Dadurch wird die komprimierte Luft über die Druckluftleitung zum ersten Balg 6 geleitet. Dieser wird infolgedessen unter erhöhten Innendruck gesetzt, sein Volumen vergrößert sich und bei ausreichendem Innendruck wird die Klemmteilkraft so groß, dass das bewegliche Klemmteil 5 und der Abdeckhebel 15 entgegen der Federkraft der Rückstellfeder 7 bewegt werden, wodurch die Fadenklemme 3 schließt und den Schussfaden 2 klemmt.The control rail 14 of the control device comes in its vertical movement in contact with the control lever 11 and presses on this the second bellows 8 together. The volume of the bellows 8 decreases and the air therein is compressed. The result is an increased internal pressure in the bellows 8. When a certain internal pressure is exceeded, the valve body is pressed against the valve spring force down - the valve 9 opens. As a result, the compressed air is conducted via the compressed air line to the first bellows 6. This is set as a result, under increased internal pressure, its volume increases and with sufficient internal pressure, the clamping part force is so large that the movable clamping member 5 and the cover 15 are moved against the spring force of the return spring 7, whereby the thread clamp 3 closes and the weft thread 2 clamps ,

Der Bringer-Greiferkopf 1 wird sodann in bekannter Art und Weise durch das von Kettfäden gebildete Webfach in die Maschinenmitte der Greiferwebmaschine bewegt. Dort muss die Fadenklemme 3 geöffnet werden, damit der Schussfaden 2 an den Holer-Greiferkopf 101 übergeben werden kann.The bringer rapier head 1 is then moved in a known manner through the shed formed by warp shafts into the machine center of rapier loom. There, the thread clamp 3 must be opened so that the weft thread 2 can be transferred to the Holer rapier head 101.

Dieser Vorgang ist in Figur 5 dargestellt. Die dargestellte Ausführungsform der Greiferwebmaschine mit erfindungsgemäßen Greiferköpfen (1,101) weist eine Ventilöffnungseinrichtung 12 zur Betätigung von elektromagnetischen Aktuatoren 13 auf. Ein erster solcher Aktuator 13 ist in Figur 5 unterhalb des Bringer-Greiferkopfs 1 dargestellt. Für die Betätigung des später beschriebenen Holer-Greiferkopfs 101 ist ein zweiter Aktuator 113 ebenfalls unterhalb des Holer-Greiferkopfes 101 angebracht.This process is in FIG. 5 shown. The illustrated embodiment of rapier loom with gripper heads (1,101) according to the invention has a valve opening device 12 for actuating electromagnetic actuators 13. A first such actuator 13 is in FIG. 5 shown below the Bringer rapier head 1. For the operation of the later described Holer rapier head 101, a second actuator 113 is also mounted below the Holer rapier head 101.

Die Aktuatoren 13, 113 sind etwa in der Maschinenmitte unterhalb der Laufbahn der Greiferköpfe 1, 101 derartig in die Laufbahn integriert angeordnet, dass zwischen Greiferkopfunterseiten und der Greiferlaufbahn die Kettfäden ohne Beschädigung hindurch geführt werden können. In Bewegungsrichtung der Greiferköpfe sind die Anordnungen der Aktuatoren 13, 113 konstruktiv derartig gewählt, dass die Funktion der Fadenübergabe zwischen Bringer- und Holer-Greiferkopf 1, 101 sicher ausgeführt werden kann.The actuators 13, 113 are arranged in such an integrated manner in the track approximately in the machine center below the track of the gripper heads 1, 101, that the warp threads can be passed without damage between gripper head bottoms and the gripper raceway. In the direction of movement of the gripper heads, the arrangements of the actuators 13, 113 constructively chosen such that the function of the yarn transfer between Bringer and Holer rapier head 1, 101 can be performed safely.

In Figur 5 ist dargestellt, dass der Bringer-Greiferkopf 1 bei seiner Bewegung im Bereich der Maschinenmitte die Position des ersten Aktuators 13 erreicht hat. Durch einen Steuerimpuls der Ventilöffnungseinrichtung 12 wird der Aktuator 13 derartig betätigt, dass eine magnetische Aktuatorkraft berührungslos auf das Ventil 9 im Bringer-Greiferkopf 1 wirkt. Dadurch wird das Ventil 9 geöffnet. Die Federkraft der Rückstellfeder 7 drückt den ersten Balg 6 zusammen. Die komprimierte Luft strömt über das Ventil 9 in den zweiten Balg 8 und die Fadenklemme 3 öffnet. Da der Abdeckhebel 15 gleichzeitig nach oben schwenkt, ist der Schussfaden 2 frei und kann vom Holer-Greiferkopf 101 erfasst und weiter transportiert werden.In FIG. 5 It is shown that the bringer rapier head 1 has reached the position of the first actuator 13 during its movement in the region of the machine center. By a control pulse of the valve opening device 12, the actuator 13 is actuated in such a way that a magnetic actuator force acts without contact on the valve 9 in the bringer rapier head 1. As a result, the valve 9 is opened. The spring force of the return spring 7 presses the first bellows 6 together. The compressed air flows through the valve 9 into the second bellows 8 and the thread clamp 3 opens. Since the cover lever 15 simultaneously pivots upward, the weft yarn 2 is free and can be detected by the holer rapier head 101 and transported on.

In den Figuren 6 bis 8 ist der Aufbau einer zweiten Ausführungsform des erfindungsgemäßen Greiferkopfes, nämlich eines Holer-Greiferkopfs 101 dargestellt.In the FIGS. 6 to 8 the construction of a second embodiment of the gripper head according to the invention, namely a holer rapier head 101 is shown.

Der Holer-Greiferkopf 101 weist in seiner hinteren, der Greiferspitze abgewandten Hälfte eine U-förmige Form mit Befestigungsbohrungen auf. In der vorderen Hälfte weist der Holer-Greiferkopf 101 jedoch eine einzige Spitze mit einer Fadenklemme 103 auf. Es ist keine Führungskontur und kein Abdeckhebel 15 vorhanden, da im Holer-Greiferkopf 101 kein Schussfadenabschnitt gebildet werden muss.The holer rapier head 101 has in its rear, the hook tip facing away from a U-shaped form with mounting holes. In the front half, however, the holer rapier head 101 has a single point with a thread clamp 103. There is no guide contour and no cover lever 15 is present, since in the holer rapier head 101 no weft thread section must be formed.

Der Holer-Greiferkopf 101 ist im Prinzip gleich aufgebaut wie der Bringer-Greiferkopf 1, jedoch wird die Fadenklemme 103 von der Rückstellfeder 107 geschlossen und über erhöhten Innendruck im ersten expandierbaren Balg 106 zur Betätigung des beweglichen Klemmteils 105 wird die Fadenklemme 103 geöffnet. Das bewegliche Klemmteil 105 hat Gabelform, wobei durch diese Gabelform das bewegliche Klemmteil 105 die Greiferspitze mit dem feststehenden Klemmteil 104 seitlich umschließt. Das feststehende Klemmteil 104 befindet sich dabei auf der Unterseite einer von der Greiferspitze weg gerichteten Hakenspitze. Die Fadenklemme 103 schließt durch eine Aufwärtsbewegung des beweglichen Klemmteils 105.The holer gripper head 101 is in principle the same structure as the bringer gripper head 1, but the thread clamp 103 is closed by the return spring 107 and the thread clamp 103 is opened by increased internal pressure in the first expandable bellows 106 for actuating the movable clamping member 105. The movable clamping part 105 has a fork shape, whereby the movable clamping part 105 laterally surrounds the hook tip with the fixed clamping part 104 due to this fork shape. The fixed clamping part 104 is located on the underside of a hook tip directed away from the hook tip. The thread clamp 103 closes by an upward movement of the movable clamping member 105th

Auch der Steuerhebel 111 ist in der vorderen, der Greiferspitze zugewandten Hälfte gabelförmig ausgeführt, während er an der hinteren Hälfte eine Steuerfläche aufweist.Also, the control lever 111 is fork-shaped in the front, the gripper tip facing half, while having a control surface on the rear half.

Der erster und der zweite Hohlkörper 106,108, das Ventil 109 und die Rückstellfeder 107 sind im Holer-Greiferkopf 101 ähnlich angeordnet wie beim Bringer-Greiferkopf 1.The first and the second hollow body 106, 108, the valve 109 and the return spring 107 are arranged similarly in the holer rapier head 101 as in the bringer rapier head 1.

In Figur 8 ist der Holer-Greiferkopf 101 mit geöffneter Fadenklemme 103 dargestellt. Der erste Balg 106 ist dabei unter Innendruck. Das Ventil 109 mit Ventilfeder 110 ist geschlossen.In FIG. 8 the Holer rapier head 101 is shown with the thread clamp 103 open. The first bellows 106 is under internal pressure. Valve 109 with valve spring 110 is closed.

Mit geöffneter Fadenklemme 103 bewegt sich der Holer-Greiferkopf 101 ins Webfach in die Position Fadenübernahme um den nächsten Schussfaden 2 vom Bringer-Greiferkopf 1 zu übernehmen.With open thread clamp 103, the holer rapier head 101 moves into the shed into the thread takeover position to take over the next weft thread 2 from the bringer rapier head 1.

Figur 9 zeigt, dass zur Übernahme des Schussfadens 2 das Ventil 109 von einem zweiten unterhalb des Holer-Greiferkopfes 101 angebrachten elektromagnetischen Aktuator 113 geöffnet wird. Die im ersten Balg 6 komprimierte Luft entweicht über die Druckluftleitung und das Ventil 109 in den zweiten expandierbaren Balg 8. Das bewegliche Klemmteil 105 wird von der Rückstellfeder 107 geschlossen. Der Schussfaden 2 wird jetzt von der Fadenklemme 103 des Holer-Greiferkopfs 101 geklemmt. Der Holer-Greiferkopf 101 wird jetzt mit geschlossener Fadenklemme 103 aus dem Webfach bewegt. FIG. 9 shows that the take-over of the weft thread 2, the valve 109 is opened by a second mounted below the holer rapier head 101 electromagnetic actuator 113. The compressed in the first bellows 6 air escapes through the compressed air line and the valve 109 in the second expandable bellows 8. The movable clamping member 105 is closed by the return spring 107. The weft thread 2 is now clamped by the thread clamp 103 of the holer rapier head 101. The holer rapier head 101 is now moved out of the shed with the thread clamp 103 closed.

Außerhalb des Webfachs kommt der Holer-Greiferkopf 101 in den Arbeitsbereich einer weiteren Steuereinrichtung, die analog zur Steuereinrichtung des Bringer-Greiferkopfs 1 aufgebaut ist. Diese ist in Figur 10 dargestellt. Durch die Steuerschiene 114 wird über den Steuerhebel 111 im Balg des zweiten Hohlkörpers 108 am Holer-Greiferkopf 101 ein erhöhter Innendruck erzeugt. Durch den erhöhten Druck wird das Ventil 109 geöffnet und die komprimierte Luft strömt in den ersten Balg 6. Das bewirkt das die Fadenklemme 103 geöffnet und der Schussfaden 2 frei gegeben wird.Outside the shed, the holer rapier head 101 comes into the working area of a further control device, which is constructed analogously to the control device of the bringer rapier head 1. This is in FIG. 10 shown. By the control rail 114, an increased internal pressure is generated via the control lever 111 in the bellows of the second hollow body 108 on the holer rapier head 101. Due to the increased pressure, the valve 109 is opened and the compressed air flows into the first bellows 6. This causes the thread clamp 103 is opened and the weft yarn 2 is released.

Anschließend wird der Schussfaden 2 durch die Webblatteinrichtung der Greiferwebmaschine an den Geweberand angeschlagen und die beschriebenen Vorgänge zum Schusseintrag beginnen von neuem.Subsequently, the weft thread 2 is struck by the Webblatteinrichtung the rapier loom to the fabric edge and begin the operations described for weft insertion again.

In den Figuren 11 und 12 ist eine dritte Ausführungsform eines erfindungsgemäßen Greiferkopfs als Bringer-Greiferkopf 201 dargestellt. Dabei ist das Ventil 209 unterhalb des ersten Balgs 206 und nicht unterhalb des zweiten Balgs 208 angebracht. Die Anordnung gemäß Figur 11 und 12 hat zur Folge, dass in Bezug auf das Ventil 209 eine umgekehrte Wirkungsrichtung des Innendrucks in den beiden Hohlkörpern 206,208 eintritt. In dieser dritten Ausführungsform wirkt ein erhöhter Innendruck im ersten Balg 206 der Rückstellkraft im Ventil 209 entgegen. Abgesehen von diesem Unterschied ist die Funktionsweise ähnlich wie in der ersten Ausführungsform. Allerdings wird zum Schließen der Fadenklemme 203 in der Position des Bringer-Greiferkopfes 201 außerhalb des Webfachs ein zusätzlicher Aktuator 213 benötigt, da das Ventil 209 bei dieser Anordnung nicht durch Überdruck im zweiten Balg 208 geöffnet werden kann.In the Figures 11 and 12 a third embodiment of a rapier head according to the invention is shown as Bringer rapier head 201. In this case, the valve 209 is mounted below the first bellows 206 and not below the second bellows 208. The arrangement according to FIG. 11 and 12 As a result, with respect to the valve 209, a reverse direction of action of the internal pressure in the two hollow bodies 206, 208 occurs. In this third embodiment, an increased internal pressure in the first bellows 206 counteracts the restoring force in the valve 209. Apart from this difference, the operation is similar to the first embodiment. However, to close the thread clamp 203 in the position of the bringer rapier head 201 outside of the shed, an additional actuator 213 is needed, since the valve 209 can not be opened by overpressure in the second bellows 208 in this arrangement.

Figur 11 zeigt das Erzeugen eines Überdrucks im zweiten elastisch verformbaren Balg 208 mittels Steuerhebel 211 und das anschließende Schließen der Fadenklemme 203 durch Betätigen des Aktuators 13 bei der Fadenaufnahme. FIG. 11 shows the generation of an overpressure in the second elastically deformable bellows 208 by means of control lever 211 and the subsequent closing of the thread clamp 203 by actuating the actuator 13 in the thread take-up.

Figur 12 zeigt das Öffnen der Fadenklemme 203 des Bringer-Greiferkopfes 201 gemäß der dritten Ausführungsform in der Maschinenmitte durch Betätigen des Aktuators 13 und Wirkung der Rückstellfeder 207 in Maschinenmitte. FIG. 12 shows the opening of the thread clamp 203 of the Bringer rapier head 201 according to the third embodiment in the machine center by operating the actuator 13 and the action of the return spring 207 in the machine center.

Bezugszeichenreference numeral

1, 101,2011, 101, 201
Greiferkopfgripper head
22
Schussfadenweft
3, 103,2033, 103,203
Fadenklemmethread clamp
4, 104, 2044, 104, 204
Feststehendes KlemmteilFixed clamping part
5, 105, 2055, 105, 205
Bewegliches KlemmteilMovable clamping part
6,106, 2066,106, 206
Erster HohlkörperFirst hollow body
7,107,2077,107,207
RückstellfederReturn spring
8, 108, 2088, 108, 208
Zweiter HohlkörperSecond hollow body
9, 109, 2099, 109, 209
VentilValve
10,11010,110
Ventilfedervalve spring
11,111,21111,111,211
Steuerhebelcontrol lever
1212
VentilöffnungseinrichtungValve opening means
13,113,21313,113,213
Aktuatoractuator
14, 11414, 114
Steuerschienecontrol rail
1515
AbdeckhebelAbdeckhebel

Claims (15)

  1. A gripper head (1, 101, 201) usable for the insertion of weft threads (2) on a gripper weaving machine with a thread clamp (3, 103, 201) attached to the gripper head (1, 101, 201), which thread clamp has a stationary clamping part (4, 104, 204) and a movable clamping part (5, 105, 205), wherein the movable clamping part (5, 105, 205) can be pressed by means of a force against the stationary clamping part (4, 104, 204), furthermore with a first hollow body (6, 106, 201) attached to the gripper head (1, 101, 201), the volume of which can be enlarged under internal pressure of a gaseous medium , wherein the first hollow body (6, 106, 206) is connected to the movable clamping part (5, 105, 205) in such a way that through the enlargement of the volume of the first hollow body (6, 106, 206) a clamping part force can be generated, which acts on the movable clamping part (5, 105, 205), furthermore with a valve (9, 109, 209) attached to the gripper head (1, 101, 201), which is connected to the first hollow body (6, 106, 206) in such a way that the gaseous medium can be introduced via the valve (9, 109, 209) into the first hollow body (6, 106, 206), characterized in that
    there is a restoring means (7, 107, 207) on the gripper head (1, 101, 201), which is connected to the movable clamping part (5, 105, 205) in such a way that a restoring force acting through the restoring means (7, 107, 207) on the movable clamping part (5, 105, 205) counteracts the clamping part force and that
    a second hollow body (8, 108, 208) is attached to the gripper head (1, 101, 201), in which an internal pressure of a gaseous medium can be generated by the fact that an outer control force is applied to this second hollow body (8, 108, 208), which causes a reduction of the volume of the second hollow body (8, 108, 208) and that the valve (9, 109, 209) is connected to the first and second hollow body (6, 8, 106, 108, 206, 208) in such a way that in the case of an open valve (9, 109, 209) an exchange of the gaseous medium between the two hollow bodies (6, 8, 106, 108, 206, 208) takes place, while in the case of a closed valve (9, 109, 209) the gaseous medium cannot escape from the first hollow body (6, 106, 206) and that a closing mechanism (10, 110) is attached to the valve (9, 109, 209) in such a way that a closing force caused by the closing means (10, 110) counteracts such forces, by which the valve (9, 109, 209) is opened and that the valve (9, 109, 209) is designed in such a way that it can be actuated by contactless transmission of signals or forces.
  2. A gripper head (1, 201) according to claim 1
    characterized in that the movable clamping part (5, 205) is pressed by means of the clamping part force against the stationary clamping part (4, 204).
  3. A gripper head (101) according to claim 1
    characterized in that the movable clamping part (105) is pressed by means of the restoring force against the stationary clamping part (104).
  4. A gripper head (1, 101,201) according to one of claims 1 to 3 characterized in that at least one of the two hollow bodies (6, 8, 106, 108, 206, 208) is designed as an expandable bellows or as a pneumatic cylinder.
  5. A gripper head (1, 101, 201) according to one of claims 1 to 4 characterized in that the reset means (7, 107, 207) is designed as a permanent magnet, as a spring or as a combination of both.
  6. A gripper head (1, 101, 201) according to one of claims 1 to 5 characterized in that the movable clamping part (5, 105, 2095) is designed as a clamping lever, which is pivoted in the gripper head (1, 101, 201) about an axis and that the restoring force counteracts a rotation of the movable clamping part (5, 105, 205) about this axis.
  7. A gripper head (1, 101, 201) according to one or several of claims 1 to 6 characterized in that the
    closing means (10, 110) is designed as a valve spring, which is dimensioned in such a way that the valve (9, 109, 209) remains closed up to a predetermined pressure of the gaseous medium counteracting the closing force.
  8. A gripper head (1, 101, 201) according to one or several of claims 1 to 7 characterized in that a control lever (11, 111, 211) is movably attached to the gripping head (1, 101, 201), which is operatively connected to the second hollow body (8, 108, 208) in such a way that by means of the control lever (11, 111, 211) an outer control force can be applied to the second hollow body (8, 108, 208) in such a way that a reduction of the volume of the second hollow body (8, 108, 208) is caused.
  9. A gripper head (1, 101, 201) according to claim 8 characterized in that the control lever (11, 111, 211) is pivoted in the gripper head (1, 101, 201) about an axis and that there is a control lever spring, which counteracts the control force.
  10. A gripper weaving machine with at least one gripper head (1, 101, 201) according to one or several of claims 1 to 9 characterized in that there is a valve opening device (12), which has at least one actuator (13, 113, 213), which is attached in the area of the runway of the gripping head (1, 101, 201), so that an actuator force can be applied to the valve (9, 109, 209) without contact in such a way that the latter is opened and that there is a control device, with which in a position of the gripper head (1, 101, 201) outside of the shed formed by warp threads an outer control force can be applied to the second hollow body (8, 108, 208) in such a way that a reduction of the volume of the second hollow body (8, 108, 208) is caused.
  11. A gripper weaving machine according to claim 10 characterized in that the actuator (13, 113 213) is a controllable electromagnet, a permanent magnet or a combination of both.
  12. A gripper weaving machine according to claim 10 or 11 characterized in that the control device has at least one cam disc, one roller lever driven by the disk cam and a control rail (14, 114), wherein the disk cam is connected to the main drive of the weaving machine and wherein the connection between the control rail (14, 114) and the roller lever is configured in such a way that the position and/or the size of the movement stroke of the control rail (14, 114) is adjustable in the direction toward the gripper head (1, 101, 201) by the operator.
  13. A gripper weaving machine according to one of claims 10 or 11 characterized in that the control device has at least one electromechanically or pneumatically driven control rail (14, 114), wherein the position and/or the size of the movement stroke of the control rail (14, 114) in the direction towards the gripper head (1, 101, 201) can be freely programmed via electronic means of the control device for different times in the weaving cycle.
  14. A gripper weaving machine according to one or several of claims 10 to 13 characterized in that there are two gripper heads (1, 101, 201) and that to each of the two gripper heads a control device is allocated in the position outside of the shed and that to each of the two gripper heads at least one actuator (13, 113) of the valve opening device (12) is allocated in the area of the center of the machine.
  15. A gripper weaving machine according to claim 14 characterized in that at least one further actuator (213) is allocated at least to one of the two gripper heads (201) in a position outside of the shed.
EP11758197.5A 2010-11-18 2011-09-15 Gripper head for the insertion of weft threads on a gripper weaving machine Active EP2640880B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010044127A DE102010044127B3 (en) 2010-11-18 2010-11-18 Gripper head for the entry of weft threads on a rapier loom and a rapier loom with such a gripper head
PCT/EP2011/066036 WO2012065768A2 (en) 2010-11-18 2011-09-15 Gripper head for the insertion of weft threads on a gripper weaving machine

Publications (2)

Publication Number Publication Date
EP2640880A2 EP2640880A2 (en) 2013-09-25
EP2640880B1 true EP2640880B1 (en) 2015-08-19

Family

ID=44654114

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11758197.5A Active EP2640880B1 (en) 2010-11-18 2011-09-15 Gripper head for the insertion of weft threads on a gripper weaving machine

Country Status (8)

Country Link
US (1) US8875747B2 (en)
EP (1) EP2640880B1 (en)
JP (1) JP5694554B2 (en)
CN (1) CN103221598B (en)
BR (1) BR112013012242A2 (en)
DE (1) DE102010044127B3 (en)
RU (1) RU2542087C2 (en)
WO (1) WO2012065768A2 (en)

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DE102010044127B3 (en) * 2010-11-18 2011-12-29 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Gripper head for the entry of weft threads on a rapier loom and a rapier loom with such a gripper head
DE102015217356B3 (en) * 2015-09-10 2016-10-20 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Weaving machine with a device and method for holding, feeding and entering weft threads in a shed
CN107881630B (en) * 2017-12-14 2020-11-20 东华大学 Rapier chuck for weaving carbon fiber expanded flat filament
US11247103B2 (en) * 2020-02-11 2022-02-15 Wilson Sporting Goods Co. Tennis ball having a thermoplastic core

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Also Published As

Publication number Publication date
JP2014500407A (en) 2014-01-09
US20130199659A1 (en) 2013-08-08
EP2640880A2 (en) 2013-09-25
RU2013127513A (en) 2014-12-27
DE102010044127B3 (en) 2011-12-29
BR112013012242A2 (en) 2016-08-09
JP5694554B2 (en) 2015-04-01
CN103221598A (en) 2013-07-24
WO2012065768A2 (en) 2012-05-24
US8875747B2 (en) 2014-11-04
CN103221598B (en) 2014-11-05
WO2012065768A3 (en) 2013-04-18
RU2542087C2 (en) 2015-02-20

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