EP1413659A1 - Weft holding device in fluid jet loom - Google Patents
Weft holding device in fluid jet loom Download PDFInfo
- Publication number
- EP1413659A1 EP1413659A1 EP20030022690 EP03022690A EP1413659A1 EP 1413659 A1 EP1413659 A1 EP 1413659A1 EP 20030022690 EP20030022690 EP 20030022690 EP 03022690 A EP03022690 A EP 03022690A EP 1413659 A1 EP1413659 A1 EP 1413659A1
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- EP
- European Patent Office
- Prior art keywords
- weft
- holding
- reed
- holding device
- members
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
- D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
- D03D47/3066—Control or handling of the weft at or after arrival
- D03D47/308—Stretching or holding the weft
Definitions
- the present invention relates to a weft holding device in a fluid jet loom, and more particularly, to a weft holding device disposed on a non-weft-inserting side.
- the length of a weft holding portion especially the length of a portion capable of holding exceeds a swinging range of a reed (between the most forward position and the most backward position of the reed).
- the weft since the weft is only sandwiched by a pair of the holding members, the weft tends to come off the holding members at the time of swinging motion of the reed, particularly when the reed moves ahead of the weft holding members.
- An object of the present invention is to provide a high responsiveness to a command to hold and to catch hold of the weft surely.
- the weft holding device is one to be attached to a member different from a reed sley of a fluid jet loom, and comprises: a pair of holding members which have a weft holding portion for receiving and holding a weft, which moves together with a reed, between the most forward position and the most backward position of the reed, the weft holding portion having a length in the moving direction of a warp shorter than the length of a swinging locus of the reed, and which are moved selectively and relatively by a drive unit in the directions to approach each other or part from each other; and an engaging member for engaging the weft received in the weft holding portion and positioning the weft relative to both holding members.
- the length of the holding member in the moving direction of the warp is shorter than the length of the moving locus of the reed, even in case of a linear movement or an angular rotational movement of holding member, a difference in time from when a command to hold is outputted until when the weft is actually caught hold of becomes small, thereby improving responsiveness.
- the weft can be surely received in the weft holding portion even if the moving range of the holding members is smaller than a device for holding a weft wherein both holding members are angularly rotated to catch hold of the weft. Therefore, a difference in time from when the command to hold is outputted until when the weft is actually caught hold of becomes small, thereby improving the responsiveness.
- the tension of the weft after insertion usually gets smaller toward the non-weft-inserting side, but the weft is beaten as it is to cause a flaw in a cloth. If, however, the weft holding portions are positioned within the swinging range of the reed, both holding members, besides being linearly moved, catch hold of the weft extending immediately after the weft insertion instantaneously and can keep the tension of the weft. Therefore, after the weft is caught hold of by the holding members, the reed is further advanced, by which the part of the weft on the non-inserting side is stretched and beaten by the reed. As a result, the tension on both end portions of the weft becomes equal, thereby preventing generation of a flaw in a cloth.
- the weft received in the weft holding portion is engaged with an engaging member and positioned relative to both holding members. Therefore, the weft is surely held by the holding members, and is prevented from coming out of the holding members with the advance of the reed.
- a certain tension can be applied to the weft, and by further adjusting the position of the engaging member forward or backward, the applied tension can be adjusted.
- the length of the weft holding portion in the moving direction of the warp can be made smaller than the length of the swinging locus of the reed.
- the holding members can be made small, thereby improving the responsiveness.
- the weft holding portion may be located, as viewed from the running direction of the weft, at the height position of the weft swinging locus connecting the weft running paths respectively at the most forward position and at the most backward position.
- the drive unit includes a drive source which relatively moves the pair of holding members in one of the directions to approach each other and to part from each other, a spring which relatively moves the pair of holding members in the other of the directions to approach each other and to part from each other, and adjusting means for adjusting the energizing force of the spring may be included.
- a drive source which relatively moves the pair of holding members in one of the directions to approach each other and to part from each other
- a spring which relatively moves the pair of holding members in the other of the directions to approach each other and to part from each other
- adjusting means for adjusting the energizing force of the spring may be included.
- the weft holding device can further include a blow nozzle for jetting a pressure fluid toward the weft held by the pair of holding members.
- a blow nozzle for jetting a pressure fluid toward the weft held by the pair of holding members.
- the weft holding device can further include a weft anti-tangling member disposed near the weft holding portion in the running direction of the weft.
- a guide port for the weft into the weft holding portion is formed by the weft anti-tangling member, so that the weft can be surely guided to the holding member when the reed swings, thereby preventing the weft from tangling with the holding member.
- the weft anti-tangling member is disposed near the non-weft-introducing side of the holding member, entanglement of the weft with the holding member is prevented.
- the weft anti-tangling member may be a plate-like member disposed opposite to both sides of the jet nozzle of the blow nozzle. Since thereby the weft anti-tangling member regulates diffusion of jetting of the pressure fluid to be jetted from the blow nozzle, even if the pressure fluid of the blow nozzle has a low pressure, the pressure fluid acts on the weft in a state strong enough to blow off the weft, so that the fluid compression equipment of the blow nozzle can be made small.
- a weft holding device 10 is disposed on the non-weft-inserting side of an air jet loom and is used for holding a weft 80 (see Fig. 4) to be inserted and advanced from a reed 12 toward a cloth fell.
- the weft holding device 10 is disposed nearer the non-weft-inserting side than the reed 12 which beats the inserted weft 80, and removably assembled by a support arm 14 into a member different from a reed sley (not shown), for example, a temple base 18 which rotatably supports a temple 16.
- a support arm 14 into a member different from a reed sley (not shown), for example, a temple base 18 which rotatably supports a temple 16.
- the position and state of assembly of the weft holding device 10 is optional.
- the reed 12 has a plurality of strip-like dents 20 at intervals in the direction of the weaving width.
- Each dent 20 has, near the longitudinal center, a convex portion 22 projected toward the cloth fell, and at the center of the convex portion 22, a concave portion 24 opening toward the cloth fell side.
- the reed 12 having the dents 20 arranged in parallel in its thickness direction forms a groove formed by the concave portions 24 of the dents 20 as a running path of the weft 80.
- the reed 12 has a coiled fine line 26 disposed at each end portion of the reed 20, with the end portions of each dent 20 inserted into adjoining turn portions of the fine lines 26 to keep the adjoining dents 20 at certain intervals and prevents relative displacement of the dents 20 by upper and lower caps 28.
- the reed 12 is attached to a reed sley (not shown) by the lower cap 28.
- the weft holding device 10 holds the weft 80 to be advanced together with the reed 12 accompanying the forward motion of the reed 12 with a pair of holding members 32, 34 to be moved selectively so as to approach and part from the drive unit 30, and assembles a pair of plate-like support members 36 arranged in front of and behind the holding members 32, 34 in the weaving width direction (running direction of the weft) into the support arm 14 by a plurality of screw members 38.
- Both support members 36 are shaped like an inverted L-letter, and the holding members 32, 34 are removably attached to the support arm 14 at the upper portions at an interval in the direction of the weaving width (weft running direction) in the upper portion so as to be located there between in the weaving width direction, and furthermore, a bracket 40 is removably assembled into the upper portion by a plurality of screw members 42.
- the drive unit 30 uses an electric actuator such as a solenoid, a motor or the like as a drive source 44, and removably assembles the drive source 44 into the bracket 40 with a plurality of screw members 48 such that its movable pin 46 projects downward. Consequently, the drive source 44 as well as the drive unit 30 is firmly assembled through the bracket 40, the support member 36 and the support arm 14 into the temple base 18 so as to adjust the position, and removably.
- an electric actuator such as a solenoid, a motor or the like
- the drive source 44 it is possible to use a one-way excitation type solenoid which incorporates a coil spring.
- An excitation command (drive command) to this solenoid is supplied from a control unit (not shown) to a drive circuit (not shown).
- excitation current (drive current) is supplied to the drive circuit to excite (drive) the drive source 44.
- the movable pin 46 of the solenoid is applied downward force by the built-in coil spring of the drive source 44 when the solenoid is not excited (not driven), while it is sucked upward against the spring force of the built-in coil spring when the solenoid is excited.
- a plate-like weft anti-tangling member 50 is removably attached to the lower end portion of each support member 36 by a plurality of spring members 52. Both weft anti-tangling members 50 are L-shaped as viewed in the direction of the weaving width and assembled into the support member 36 at the upper end portion.
- Both weft anti-tangling members 50 are spaced apart in the direction of the weaving width, interposing the holding members 32, 34, and each has a U-shaped guide port 54 opening toward the non-cloth-fell side (the upstream side in the moving direction of the warp) at the front end portion so as to receive the front end portion of the weft 80 which is advanced together with the reed 12.
- the interval between the upper and lower parts of the portion from the guide port 54 toward the non-cloth-fell side (the front end side) is made larger toward the non-cloth-fell side so as to surely receive the end portion of the weft 80 which is advanced together with the reed 12.
- the holding member 32 is shaped like a bracket with a one-side open rectangular or a U-like shape opening toward the non-cloth-fell side and acts as a fixed side holding member attached immovably to the support member 36.
- the holding member 34 is immovably attached to the lower end portion of a movable shaft 56 which is independent from the holding member 34 and which extends vertically through the holding member 32, and acts as a holding member on the movable side.
- the movable shaft 56 abuts at its upper end face on the lower end face of the movable pin 46.
- the holding member 34 is located below the holding member 32 at an interval. Either one of the holding members 32 and 34 or both may be made movable.
- the movable shaft 56 on which the weft 80 advancing with the reed 12 abuts, acts as an engaging member for preventing the weft 80 from advancing further.
- the axis of the movable shaft 56 coincides with the axis of the movable pin 46.
- the weft holding portion is formed by the horizontal lower end face 58 and the horizontal upper end face 60 of the holding member 32, and opens toward the non-cloth-fell side.
- the height positions of the weft holding portions 58, 60 are the height position of the guide port 54 (See Fig. 2).
- a position nearer the non-cloth-fell side than the weft holding portions 58, 60 is adapted to be a weft inlet, the distance between the upper and lower parts of which is made larger toward the non-cloth-fell side so as to surely receive the end portion of the weft advancing together with the reed 12.
- the length L (the distance from the position of the movable shaft 56 to the front end portion of the non-cloth-fell side of the weft holding members 58, 60) of the weft holding members 58, 60 in the swinging direction of the reed 12 is shorter than the length (the distance between the most forward position and the most backward position) of the swinging locus (actually, the swinging locus of the weft running path accompanying the swinging of the reed 12) of the reed 12 in the moving direction of the warp.
- a guide shaft 62 for the holding member 34 and the movable shaft 56 penetrates the holding member 32 not to move up and down in a state of extending vertically parallel with the movable shaft 56.
- the holding springs 64 and 66 to apply the weft holding force to the holding members 32, 34 are compression coil spring in the illustration, and each of them is within a one-side open rectangular or U-shaped area formed by the holding member 32 and disposed around the movable shaft 56 and the guide shaft 62.
- the movable shaft 56 and the guide shaft 62 penetrate a spring force adjusting member 68 so as to move vertically and are connected by the spring force adjusting member 68 and an adjusting screw 70.
- the spring force adjusting member 68 is disposed above the holding springs 64 and 66 so as to adjust the energizing force of the holding springs 64 and 66, and assembled by the adjusting screw 70 into the movable shaft 56 so as to be able to change the attached position.
- the holding springs 64 and 66 constantly apply the upward the force to the spring force adjusting member 68. However, the spring force of the holding springs 64 and 66 is smaller than the spring force of the built-in coil spring of the drive source 44.
- the holding member 34 is applied the downward spring force by the built-in coil spring and can be changed by changing the position assembling the spring force adjusting member 68 into the movable shaft 56.
- a blow nozzle 72 for removing the weft from the weft holding device 10 is disposed between both weft anti-tangling members 50 and on the cloth fell side of the weft holding portions 58, 60 so as to jet a pressure fluid like the compressed air from a nozzle 74 horizontally relative to the weft holding members 58, 60 toward the non-cloth-fell side.
- the blow nozzle 72 is air-tightly connected to a hose 76 extending over the support arm 14.
- a stretch nozzle 78 for sucking the end portion of the inserted weft 80 is disposed, as shown in Fig. 4, on the non-weft-insert side of the holding members 32, 34 so as to form an air flow to suck the end of the weft 80.
- the height position of the weft 80 is kept approximately at the height positions of the weft holding portions 58, 60, because the end portion of the weft 80 is sucked by the stretch nozzle 78.
- the above-mentioned weft holding device 10 acts as follows.
- weft insertion is started.
- the movable pin 46 by the spring force of the built-in coil spring of the drive source 44, presses down the movable shaft 56 and the movable-side holding member 34 against the spring force of the holding springs 64, 66, whereby the weft holding portions 58, 60 are spaced apart so as to receive the weft 80.
- the reed 12 is advanced from the most backward position as shown in the upper part of Fig. 4 toward the most forward position as shown in the lower part of Fig. 4.
- the inserted weft 80 is advanced together with the reed 12 to be introduced between the weft holding portions 58 and 60, while the front end portion on the non-insert side is sucked into a stretch nozzle 78.
- the drive source 44 is driven. Since the movable pin 46 is raised by this, the movable shaft 56 and the weft holding member 34 are raised by the spring force of the holding springs 64, 66, and the weft 80 is held by the weft holding members 58, 60. At this time, since the weft 80 abuts on the movable shaft 56, the weft 80, positioned relative to both holding members 32, 34, is surely held by the holding members 32, 34.
- the timing to start driving the drive source 44 is set beforehand together with the timing of weft insertion, the timing to start warp shed motion, the timing to start the reed beating motion and the like, on the basis of the rotation angle of the main shaft of the loom.
- the motion of the holding member 34 at the time of holding the weft 80 is a linear motion, the weft 80 can be surely received into the weft holding portions 58, 60, even if the range of moving of the holding member 34 is small in comparison with a device in which a holding member is angularly rotated to hold the weft. As a result, a difference in time from when a command to hold is outputted until the weft 80 is actually held becomes smaller, thereby improving the responsiveness.
- weft holding portions 58, 60 are located at the height position of the weft swinging locus of the weft running path connecting the most forward position and the most backward position of the reed 12, as viewed from the weft running direction, the weft 80 is more surely received in the weft holding portions to be held more surely.
- the reed 12 is further advanced, and the weft 80 is beaten against the cloth fell. Due to such a further advance of the reed 12, further tension is applied to the weft 80. At this time, since the weft 80 is surely held by the holding members 32, 34, the weft 80 is prevented from coming off, accompanying the advance of the reed 12, from the holding members 32, 34.
- weft 80 abuts the weft anti-tangling member 50 while abutting the movable shaft 56 to be prevented from advancing further, so that the weft 80 is prevented from tangling with the vicinity of the weft holding portions 58, 60.
- the weft holding portions 58, 60 are located within the swinging range of the reed 12 and the holding members 32, 34 are linearly moved, the weft stretched immediately after the weft insertion can be instantaneously held, and the tension of the weft 80 can be maintained.
- the reed 12 is further advanced, so that the portion of the non-weft-insert side of the weft 80 is extended and beaten. Thereby, the tensions at both ends of the weft 80 become equal, thereby preventing generation of a defect in cloth.
- the drive source 44 is stopped, the holding of the weft 80 by the holding members 32, 34 is released, the reed 12 begins to withdraw, and the next weft insertion is started.
- the weft 80 is removed from the holding members 32, 34, and before the next weft arrives, the pressure fluid is jetted from the nozzle 74 of the blow nozzle 72 to the weft holding portions 58, 60.
- the pressure fluid from the nozzle 74 is jetted substantially horizontally from the cloth fell side to the non-cloth-fell side relative to the weft holding portions 58, 60, and passes the weft holding portions 58, 60. Thereby, the weft holding portions 58, 60, the weft 80 and dust tangling in both weft anti-tangling members 50 are removed from the weft holding device 10.
- the drive unit 30 includes: the drive source 44 for linearly move the holding members 32 and 34 relatively in one of the direction to approach each other and the direction to part from each other; holding springs 64 and 66 for linearly moving the holding members 32 and 34 relatively in the other of the direction to approach each other and the direction to part from each other; the spring force adjusting member 68 for adjusting the energizing force of the holding springs 64 and 66, and the adjusting screw 70, so that, by adjusting the force of the holding springs 64, 66, the energizing force to hold the weft can be adjusted to a proper value, thereby preventing the weft 80 from being applied an excessive tension.
- the drive source 44 for example, out of the swinging range of the reed and also in front of and behind the weft holding device 10, to move the movable pin 46 horizontally, to move horizontally the movable shaft 56 abutted by the movable pin 46 and to connect the movable shaft 56 with the holding member 34 through a mechanism for converting the horizontal motion of the movable shaft 56 into an angular rotation of the holding member 34.
- a weft holding device 90 differs from the weft holding device 10 shown in Fig. 1 in that the former uses a stick-like weft anti-tangling member 92.
- the weft anti-tangling member 92 is disposed in front of and behind the weft holding portions 58, 60 in the running direction of the weft 80 so as to extend upward and downward.
- the weft holding device 90 disposes the weft holding portions 58, 60 and the weft anti-tangling member 92 between the reed 12 and the stretch nozzle 78.
- the weft holding device 90 is attached to the loom through a bracket not shown, like the weft holding device 10 shown in Fig. 1.
- one end portions of the holding springs 64, 66 are attached to a bracket 94, but the spring force may be made adjustable like the holding springs 64, 66 of the weft holding device 10.
- the weft anti-tangling member 92 may be disposed near the non-weft-introducing side of the holding members 32, 34. It also prevents the weft 80 from tangling with the holding members 32, 34.
- the timing to drive the drive source 44 and the jet timing of the blow nozzle 72 can be freely controlled by a command from an operation panel and the like not shown.
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Abstract
Description
- The present invention relates to a weft holding device in a fluid jet loom, and more particularly, to a weft holding device disposed on a non-weft-inserting side.
- As a weft holding device in a fluid jet loom, techniques described in patent documents 1 and 2 are known.
- Both prior arts described in patent documents 1 and 2 have a mechanism such as a so-called hinge in which one of a pair of weft holding members angularly rotates about a rotation shaft.
- In both prior arts, the length of a weft holding portion, especially the length of a portion capable of holding exceeds a swinging range of a reed (between the most forward position and the most backward position of the reed).
- [Patent Document 1]
Japanese Patent Appln. Public Disclosure No. 10-130999 - [Patent Document 2]
Japanese Patent Appln. Public Disclosure No. 2000-199152 - In such prior arts, an axis of a support point which is the axis of a rotation shaft being out of a swinging range of a reed, the distance from the axis of the support point of a pair of holding members to a weft holding position is-long. For this reason, in both prior arts, if the swinging range of the holding members is small, it becomes difficult to receive the weft between the holding members, while if the swinging range of the holding members is large, a difference in time from when a command to hold is outputted until when the weft is actually held is great, which results in bad responsiveness of the weft holding device.
- Also, in both prior arts, since the weft is only sandwiched by a pair of the holding members, the weft tends to come off the holding members at the time of swinging motion of the reed, particularly when the reed moves ahead of the weft holding members.
- An object of the present invention is to provide a high responsiveness to a command to hold and to catch hold of the weft surely.
- The weft holding device according to the present invention is one to be attached to a member different from a reed sley of a fluid jet loom, and comprises: a pair of holding members which have a weft holding portion for receiving and holding a weft, which moves together with a reed, between the most forward position and the most backward position of the reed, the weft holding portion having a length in the moving direction of a warp shorter than the length of a swinging locus of the reed, and which are moved selectively and relatively by a drive unit in the directions to approach each other or part from each other; and an engaging member for engaging the weft received in the weft holding portion and positioning the weft relative to both holding members.
- Since the length of the holding member in the moving direction of the warp is shorter than the length of the moving locus of the reed, even in case of a linear movement or an angular rotational movement of holding member, a difference in time from when a command to hold is outputted until when the weft is actually caught hold of becomes small, thereby improving responsiveness.
- Also, in case of a weft holding device wherein holding members receive the end portion on a non-inserting side of the weft inserted into a warp shed as the reed advances, and holding the weft with both holding members moved linearly by the drive unit, the weft can be surely received in the weft holding portion even if the moving range of the holding members is smaller than a device for holding a weft wherein both holding members are angularly rotated to catch hold of the weft. Therefore, a difference in time from when the command to hold is outputted until when the weft is actually caught hold of becomes small, thereby improving the responsiveness.
- The tension of the weft after insertion usually gets smaller toward the non-weft-inserting side, but the weft is beaten as it is to cause a flaw in a cloth. If, however, the weft holding portions are positioned within the swinging range of the reed, both holding members, besides being linearly moved, catch hold of the weft extending immediately after the weft insertion instantaneously and can keep the tension of the weft. Therefore, after the weft is caught hold of by the holding members, the reed is further advanced, by which the part of the weft on the non-inserting side is stretched and beaten by the reed. As a result, the tension on both end portions of the weft becomes equal, thereby preventing generation of a flaw in a cloth.
- The weft received in the weft holding portion is engaged with an engaging member and positioned relative to both holding members. Therefore, the weft is surely held by the holding members, and is prevented from coming out of the holding members with the advance of the reed.
- Also, at this time, a certain tension can be applied to the weft, and by further adjusting the position of the engaging member forward or backward, the applied tension can be adjusted.
- The length of the weft holding portion in the moving direction of the warp can be made smaller than the length of the swinging locus of the reed. Thus, the holding members can be made small, thereby improving the responsiveness.
- The weft holding portion may be located, as viewed from the running direction of the weft, at the height position of the weft swinging locus connecting the weft running paths respectively at the most forward position and at the most backward position. By doing' so, the weft can be surely received by the weft holding portion and more surely held.
- The drive unit includes a drive source which relatively moves the pair of holding members in one of the directions to approach each other and to part from each other, a spring which relatively moves the pair of holding members in the other of the directions to approach each other and to part from each other, and adjusting means for adjusting the energizing force of the spring may be included. By doing so, since the holding force can be set at an appropriate value by adjusting the energizing force of the spring, applying excessive tension to the weft can be prevented. Further, the energizing force may be adjusted by replacing the springs.
- The weft holding device can further include a blow nozzle for jetting a pressure fluid toward the weft held by the pair of holding members. Thus, the weft can be surely discharged from the holding members by the pressure fluid jetted from the blow nozzle, thereby preventing tangling of the weft with the weft holding device.
- The weft holding device can further include a weft anti-tangling member disposed near the weft holding portion in the running direction of the weft. As a result, a guide port for the weft into the weft holding portion is formed by the weft anti-tangling member, so that the weft can be surely guided to the holding member when the reed swings, thereby preventing the weft from tangling with the holding member. Also, even if the weft anti-tangling member is disposed near the non-weft-introducing side of the holding member, entanglement of the weft with the holding member is prevented.
- The weft anti-tangling member may be a plate-like member disposed opposite to both sides of the jet nozzle of the blow nozzle. Since thereby the weft anti-tangling member regulates diffusion of jetting of the pressure fluid to be jetted from the blow nozzle, even if the pressure fluid of the blow nozzle has a low pressure, the pressure fluid acts on the weft in a state strong enough to blow off the weft, so that the fluid compression equipment of the blow nozzle can be made small.
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- Fig. 1 is a side view of the first embodiment of the weft holding device according to the present invention.
- Fig. 2 is an enlarged view of the weft holding device shown in Fig. 1
- Fig. 3 is an enlarged front view of the weft holding device shown in Fig. 1.
- Fig. 4 is a plan view of the weft holding device shown in Fig. 1.
- Fig. 5 is a typical front view of the second embodiment of the weft holding device according to the present invention.
- Fig. 6 is a typical side view of the weft holding device shown in Fig. 5.
- Referring to Figs. 1 - 4, a
weft holding device 10 is disposed on the non-weft-inserting side of an air jet loom and is used for holding a weft 80 (see Fig. 4) to be inserted and advanced from areed 12 toward a cloth fell. - The
weft holding device 10 is disposed nearer the non-weft-inserting side than thereed 12 which beats the insertedweft 80, and removably assembled by asupport arm 14 into a member different from a reed sley (not shown), for example, atemple base 18 which rotatably supports atemple 16. However, the position and state of assembly of theweft holding device 10 is optional. - The
reed 12 has a plurality of strip-like dents 20 at intervals in the direction of the weaving width. Eachdent 20 has, near the longitudinal center, aconvex portion 22 projected toward the cloth fell, and at the center of theconvex portion 22, aconcave portion 24 opening toward the cloth fell side. Thereed 12 having thedents 20 arranged in parallel in its thickness direction forms a groove formed by theconcave portions 24 of thedents 20 as a running path of theweft 80. - The
reed 12 has a coiledfine line 26 disposed at each end portion of thereed 20, with the end portions of eachdent 20 inserted into adjoining turn portions of thefine lines 26 to keep theadjoining dents 20 at certain intervals and prevents relative displacement of thedents 20 by upper andlower caps 28. Thereed 12 is attached to a reed sley (not shown) by thelower cap 28. - The
weft holding device 10 holds theweft 80 to be advanced together with thereed 12 accompanying the forward motion of thereed 12 with a pair ofholding members drive unit 30, and assembles a pair of plate-like support members 36 arranged in front of and behind theholding members support arm 14 by a plurality ofscrew members 38. - Both
support members 36 are shaped like an inverted L-letter, and theholding members support arm 14 at the upper portions at an interval in the direction of the weaving width (weft running direction) in the upper portion so as to be located there between in the weaving width direction, and furthermore, abracket 40 is removably assembled into the upper portion by a plurality ofscrew members 42. - The
drive unit 30 uses an electric actuator such as a solenoid, a motor or the like as adrive source 44, and removably assembles thedrive source 44 into thebracket 40 with a plurality ofscrew members 48 such that itsmovable pin 46 projects downward. Consequently, thedrive source 44 as well as thedrive unit 30 is firmly assembled through thebracket 40, thesupport member 36 and thesupport arm 14 into thetemple base 18 so as to adjust the position, and removably. - As the
drive source 44, it is possible to use a one-way excitation type solenoid which incorporates a coil spring. An excitation command (drive command) to this solenoid is supplied from a control unit (not shown) to a drive circuit (not shown). By this, excitation current (drive current) is supplied to the drive circuit to excite (drive) thedrive source 44. - The
movable pin 46 of the solenoid is applied downward force by the built-in coil spring of thedrive source 44 when the solenoid is not excited (not driven), while it is sucked upward against the spring force of the built-in coil spring when the solenoid is excited. - A plate-like
weft anti-tangling member 50 is removably attached to the lower end portion of eachsupport member 36 by a plurality ofspring members 52. Bothweft anti-tangling members 50 are L-shaped as viewed in the direction of the weaving width and assembled into thesupport member 36 at the upper end portion. - Both
weft anti-tangling members 50 are spaced apart in the direction of the weaving width, interposing the holdingmembers U-shaped guide port 54 opening toward the non-cloth-fell side (the upstream side in the moving direction of the warp) at the front end portion so as to receive the front end portion of theweft 80 which is advanced together with thereed 12. The interval between the upper and lower parts of the portion from theguide port 54 toward the non-cloth-fell side (the front end side) is made larger toward the non-cloth-fell side so as to surely receive the end portion of theweft 80 which is advanced together with thereed 12. - The holding
member 32 is shaped like a bracket with a one-side open rectangular or a U-like shape opening toward the non-cloth-fell side and acts as a fixed side holding member attached immovably to thesupport member 36. - On the other hand, the holding
member 34 is immovably attached to the lower end portion of amovable shaft 56 which is independent from the holdingmember 34 and which extends vertically through the holdingmember 32, and acts as a holding member on the movable side. Themovable shaft 56 abuts at its upper end face on the lower end face of themovable pin 46. The holdingmember 34 is located below the holdingmember 32 at an interval. Either one of the holdingmembers - The
movable shaft 56, on which theweft 80 advancing with thereed 12 abuts, acts as an engaging member for preventing theweft 80 from advancing further. The axis of themovable shaft 56 coincides with the axis of themovable pin 46. - The weft holding portion is formed by the horizontal
lower end face 58 and the horizontal upper end face 60 of the holdingmember 32, and opens toward the non-cloth-fell side. The height positions of theweft holding portions - A position nearer the non-cloth-fell side than the
weft holding portions reed 12. - The length L (the distance from the position of the
movable shaft 56 to the front end portion of the non-cloth-fell side of theweft holding members 58, 60) of theweft holding members reed 12 is shorter than the length (the distance between the most forward position and the most backward position) of the swinging locus (actually, the swinging locus of the weft running path accompanying the swinging of the reed 12) of thereed 12 in the moving direction of the warp. - A
guide shaft 62 for the holdingmember 34 and themovable shaft 56 penetrates the holdingmember 32 not to move up and down in a state of extending vertically parallel with themovable shaft 56. - The holding springs 64 and 66 to apply the weft holding force to the holding
members member 32 and disposed around themovable shaft 56 and theguide shaft 62. - The
movable shaft 56 and theguide shaft 62 penetrate a springforce adjusting member 68 so as to move vertically and are connected by the springforce adjusting member 68 and an adjustingscrew 70. The springforce adjusting member 68 is disposed above the holding springs 64 and 66 so as to adjust the energizing force of the holding springs 64 and 66, and assembled by the adjustingscrew 70 into themovable shaft 56 so as to be able to change the attached position. - The holding springs 64 and 66 constantly apply the upward the force to the spring
force adjusting member 68. However, the spring force of the holding springs 64 and 66 is smaller than the spring force of the built-in coil spring of thedrive source 44. - As a result, when the
drive source 44 is not driven, the holdingmember 34 is applied the downward spring force by the built-in coil spring and can be changed by changing the position assembling the springforce adjusting member 68 into themovable shaft 56. - A
blow nozzle 72 for removing the weft from theweft holding device 10 is disposed between both weftanti-tangling members 50 and on the cloth fell side of theweft holding portions nozzle 74 horizontally relative to theweft holding members blow nozzle 72 is air-tightly connected to ahose 76 extending over thesupport arm 14. - A
stretch nozzle 78 for sucking the end portion of the insertedweft 80 is disposed, as shown in Fig. 4, on the non-weft-insert side of the holdingmembers weft 80. The height position of theweft 80 is kept approximately at the height positions of theweft holding portions weft 80 is sucked by thestretch nozzle 78. - The above-mentioned
weft holding device 10 acts as follows. - Firstly, with the
drive source 44 not driven, weft insertion is started. When thedrive source 44 is not driven, themovable pin 46, by the spring force of the built-in coil spring of thedrive source 44, presses down themovable shaft 56 and the movable-side holding member 34 against the spring force of the holding springs 64, 66, whereby theweft holding portions weft 80. - Then, with the
stretch nozzle 78 driven, thereed 12 is advanced from the most backward position as shown in the upper part of Fig. 4 toward the most forward position as shown in the lower part of Fig. 4. By this, the insertedweft 80 is advanced together with thereed 12 to be introduced between theweft holding portions stretch nozzle 78. - At this time, since the
guide port 54 and the vertical distance of the position of each non-cloth-fell side of theweft holding portions weft 80 is surely received by theguide port 54 and theweft holding portions weft 80, abutting on themovable shaft 56, is prevented from advancing further. - Then, after the
weft 80 is engaged with themovable shaft 56, thedrive source 44 is driven. Since themovable pin 46 is raised by this, themovable shaft 56 and theweft holding member 34 are raised by the spring force of the holding springs 64, 66, and theweft 80 is held by theweft holding members weft 80 abuts on themovable shaft 56, theweft 80, positioned relative to both holdingmembers members - The timing to start driving the
drive source 44 is set beforehand together with the timing of weft insertion, the timing to start warp shed motion, the timing to start the reed beating motion and the like, on the basis of the rotation angle of the main shaft of the loom. - In the
weft holding device 10, since the motion of the holdingmember 34 at the time of holding theweft 80 is a linear motion, theweft 80 can be surely received into theweft holding portions member 34 is small in comparison with a device in which a holding member is angularly rotated to hold the weft. As a result, a difference in time from when a command to hold is outputted until theweft 80 is actually held becomes smaller, thereby improving the responsiveness. - Since the
weft holding portions reed 12, as viewed from the weft running direction, theweft 80 is more surely received in the weft holding portions to be held more surely. - Then, the
reed 12 is further advanced, and theweft 80 is beaten against the cloth fell. Due to such a further advance of thereed 12, further tension is applied to theweft 80. At this time, since theweft 80 is surely held by the holdingmembers weft 80 is prevented from coming off, accompanying the advance of thereed 12, from the holdingmembers - Also, as the energizing force by the holding springs 64, 66 is adjusted, a constant tension is applied to the holding
member 34. - Also, the
weft 80 abuts theweft anti-tangling member 50 while abutting themovable shaft 56 to be prevented from advancing further, so that theweft 80 is prevented from tangling with the vicinity of theweft holding portions - Furthermore, since the
weft holding portions reed 12 and the holdingmembers weft 80 can be maintained. As a result, after theweft 80 is held by the holdingmembers reed 12 is further advanced, so that the portion of the non-weft-insert side of theweft 80 is extended and beaten. Thereby, the tensions at both ends of theweft 80 become equal, thereby preventing generation of a defect in cloth. - Thereafter, the
drive source 44 is stopped, the holding of theweft 80 by the holdingmembers reed 12 begins to withdraw, and the next weft insertion is started. At this time, by the swinging motion of the reed, theweft 80 is removed from the holdingmembers nozzle 74 of theblow nozzle 72 to theweft holding portions - The pressure fluid from the
nozzle 74 is jetted substantially horizontally from the cloth fell side to the non-cloth-fell side relative to theweft holding portions weft holding portions weft holding portions weft 80 and dust tangling in both weftanti-tangling members 50 are removed from theweft holding device 10. - Also, since diffusion of jetting of the pressure fluid from the
nozzle 74 is restricted by the plate-like weftanti-tangling members 50 arranged to face each other on both sides of thenozzle 74, even if the pressure of the pressure fluid from theblow nozzle 72 is low, the pressure fluid acts on theweft 80 strongly enough to blow off theweft 80, so that a fluid compressor of theblow nozzle 72 can be made small. - According to the
weft holding device 10, thedrive unit 30 includes: thedrive source 44 for linearly move the holdingmembers springs members force adjusting member 68 for adjusting the energizing force of the holding springs 64 and 66, and the adjustingscrew 70, so that, by adjusting the force of the holding springs 64, 66, the energizing force to hold the weft can be adjusted to a proper value, thereby preventing theweft 80 from being applied an excessive tension. - Also, it is possible to provide the
drive source 44, for example, out of the swinging range of the reed and also in front of and behind theweft holding device 10, to move themovable pin 46 horizontally, to move horizontally themovable shaft 56 abutted by themovable pin 46 and to connect themovable shaft 56 with the holdingmember 34 through a mechanism for converting the horizontal motion of themovable shaft 56 into an angular rotation of the holdingmember 34. - Referring to Figs. 5 and 6, a
weft holding device 90 differs from theweft holding device 10 shown in Fig. 1 in that the former uses a stick-likeweft anti-tangling member 92. Theweft anti-tangling member 92 is disposed in front of and behind theweft holding portions weft 80 so as to extend upward and downward. - The
weft holding device 90 disposes theweft holding portions weft anti-tangling member 92 between thereed 12 and thestretch nozzle 78. Theweft holding device 90 is attached to the loom through a bracket not shown, like theweft holding device 10 shown in Fig. 1. - In the embodiments shown in Figs. 5 and 6, one end portions of the holding springs 64, 66 are attached to a
bracket 94, but the spring force may be made adjustable like the holding springs 64, 66 of theweft holding device 10. - In the embodiment shown in Fig. 6, as shown by a dashed line, the
weft anti-tangling member 92 may be disposed near the non-weft-introducing side of the holdingmembers weft 80 from tangling with the holdingmembers - Also, it is possible to provide a holding spring not in the holding member which is driving in the foregoing embodiment but in the other holding member.
- The timing to drive the
drive source 44 and the jet timing of theblow nozzle 72 can be freely controlled by a command from an operation panel and the like not shown. - The present invention is not limited to the foregoing embodiments but can be variously modified without departing from its spirit.
Claims (7)
- A weft holding device (10) in a fluid jet loom, to be attached to a member different from a reed sley of the fluid jet loom, comprising:a pair of holding members (32, 34) each having a weft holding portion (58, 60) for receiving the weft which moves together with a reed (12) and holding the weft (80), said weft holding portion (58, 60) being positioned between the most forward position and the most backward position of said reed (12), said weft holding portion (58, 60) having a length in the warp moving direction shorter than the length of the swinging locus of said reed (12), and said pair of holding members (32, 34) being moved by a drive unit (30) selectively and relatively in their contacting and parting directions; andan engaging member for engaging the weft (80) received in said weft holding portion (58, 60) and positioning relative to both holding members (32, 34).
- The weft holding device (10) according to claim 1, wherein the length of said weft holding portion (58, 60) in the warp moving direction is smaller than the length of the swinging locus of the reed (12).
- The weft holding device (10) according to claim 1 or 2, wherein said weft holding portion (58, 60) is located at the height position of the weft swinging locus connecting the weft (80) running path of said reed (12) in said most forward position and said most backward position in view of the running direction of said weft (80).
- The weft holding device (10) according to any one of claims 1 through 3, wherein said drive unit (30) includes a drive source for moving said pair of holding members (32, 34) relatively in either one of the direction to approach each other and the direction to part from each other, and a spring for relatively moving said pair of holding members (32, 34) in the other of the direction to approach each other and the direction to part from each other.
- The weft holding device (10) according to any one of claims 1 through 4, further comprising a blow nozzle for jetting a pressure fluid toward the weft (80) held by said pair of holding members (32, 34).
- The weft holding device (10) according to any one of claims 1 through 5, further comprising a weft anti-tangling member disposed in the vicinity of said weft holding portion (58, 60) in the running direction of said weft (80).
- The weft holding device (10) according to any one of claims 1 through 5, further comprising a weft anti-tangling member disposed in the vicinity of the non-weft-introducing side of said weft holding portion (58, 60).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002308792 | 2002-10-23 | ||
JP2002308792A JP4028349B2 (en) | 2002-10-23 | 2002-10-23 | Weft gripping device for fluid jet loom |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1413659A1 true EP1413659A1 (en) | 2004-04-28 |
Family
ID=32064343
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20030022690 Withdrawn EP1413659A1 (en) | 2002-10-23 | 2003-10-07 | Weft holding device in fluid jet loom |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1413659A1 (en) |
JP (1) | JP4028349B2 (en) |
CN (1) | CN1281804C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102517762A (en) * | 2011-11-25 | 2012-06-27 | 江苏万工科技集团有限公司 | System for measuring stability of weft yarn carried by main jet flow |
CN105671750A (en) * | 2016-04-15 | 2016-06-15 | 苏州市丹纺纺织研发有限公司 | Spiral spring type weft catching device |
CN105671751A (en) * | 2016-04-15 | 2016-06-15 | 苏州市丹纺纺织研发有限公司 | Sliding positioning type weft catch device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102634916B (en) * | 2012-04-06 | 2013-09-18 | 经纬纺织机械股份有限公司 | First weft yarn stretching device |
CN104846520B (en) * | 2015-06-01 | 2016-08-24 | 苏州市晨彩纺织研发有限公司 | A kind of weft yarn eject position keeps structure |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4570683A (en) * | 1982-01-16 | 1986-02-18 | Sulzer Brothers Limited | Yarn holding device |
JPH07138846A (en) * | 1993-11-10 | 1995-05-30 | Nissan Tecsys Kk | Weft tip holder in jet loom |
JPH10130999A (en) * | 1996-10-31 | 1998-05-19 | Tsudakoma Corp | Weft-clamping and stretching apparatus of fluid-jet loom |
-
2002
- 2002-10-23 JP JP2002308792A patent/JP4028349B2/en not_active Expired - Fee Related
-
2003
- 2003-10-07 EP EP20030022690 patent/EP1413659A1/en not_active Withdrawn
- 2003-10-23 CN CN 200310102883 patent/CN1281804C/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4570683A (en) * | 1982-01-16 | 1986-02-18 | Sulzer Brothers Limited | Yarn holding device |
JPH07138846A (en) * | 1993-11-10 | 1995-05-30 | Nissan Tecsys Kk | Weft tip holder in jet loom |
JPH10130999A (en) * | 1996-10-31 | 1998-05-19 | Tsudakoma Corp | Weft-clamping and stretching apparatus of fluid-jet loom |
Non-Patent Citations (2)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 1995, no. 08 29 September 1995 (1995-09-29) * |
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 10 31 August 1998 (1998-08-31) * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102517762A (en) * | 2011-11-25 | 2012-06-27 | 江苏万工科技集团有限公司 | System for measuring stability of weft yarn carried by main jet flow |
CN105671750A (en) * | 2016-04-15 | 2016-06-15 | 苏州市丹纺纺织研发有限公司 | Spiral spring type weft catching device |
CN105671751A (en) * | 2016-04-15 | 2016-06-15 | 苏州市丹纺纺织研发有限公司 | Sliding positioning type weft catch device |
CN105671750B (en) * | 2016-04-15 | 2017-12-01 | 苏州市丹纺纺织研发有限公司 | A kind of Mainspring type catches latitude device |
CN105671751B (en) * | 2016-04-15 | 2019-09-13 | 苏州市丹纺纺织研发有限公司 | A kind of sliding positioning formula catches latitude device |
Also Published As
Publication number | Publication date |
---|---|
JP4028349B2 (en) | 2007-12-26 |
CN1281804C (en) | 2006-10-25 |
CN1497085A (en) | 2004-05-19 |
JP2004143618A (en) | 2004-05-20 |
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