JP2004076230A - Weft yarn length-measuring reservoir device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weft yarn length-measuring reservoir device capable of easily changing the reserved length, capable of performing weft yarn insertion including restrained flying travel, easily performing an operation on restarting after stopping a loom, capable of starting from in the vicinity of 180° crank angle capable of making beating up force as a constant from the beginning, and performing the adjustment of the measuring length on changing the reservoir length automatically. <P>SOLUTION: This weft yarn length-measuring reservoir device equipped with a meandering friction groove 2 installed at the outer circumference of yarn-winding side end of reservoir drum 1 and a yarn exit or a first yarn guide 3 for guiding the yarn to the meandering friction groove is provided by installing a yarn-engaging pin 8 appearing or disappearing at a prescribed crank angle at one position of the outer circumferential end of yarn-releasing side of the reservoir drum 1 and a yarn-detaching device 4 for moving the yarn exit or the first yarn guide to the reservoir drum 1 side on stopping the loom and returning the yarn exit or the yarn guide on a tangential line of the meandering frictional groove on starting the rotation of the loom. In the separated drum type device, the meandering friction groove 2 is installed as one unit at the outer circumference at the yarn winding side end of each of separated pieces. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a length measuring and storing device for a weft provided in a water jet loom or an air jet loom, and stores a weft of a length necessary for one flight by winding it around a drum, and performing free flight. The present invention relates to a device that realizes weft insertion by following a constrained flight.
[0002]
[Prior art]
In a fluid jet loom, weft yarns are measured and stored in advance to a length corresponding to the weaving width, and are conveyed by water or air jetted from a nozzle for weft insertion. Therefore, the weft insertion device of these looms is provided with a length measuring and storing device for measuring and storing the weft yarn before flying. This type of device generally has a structure in which a measured yarn is wound around a drum and stored, and a rotary drum type in which the drum rotates and a drum in which the yarn guide rotates and stops. There is a fixed drum type in which the yarn is wound around the tub. The rotating drum type has a feature that the unwinding resistance of the yarn is smaller than that of the fixed drum type.
[0003]
The length of the yarn stored in the drum can be changed depending on the number of windings, but cannot be finely changed. The split drum type, in which the drum diameter is changed by dividing the drum into multiple pieces in the circumferential direction and moving each piece in the radial direction, the length of the stored weft is continuously changed. Can be. However, when the drum is divided, a part of the drum cannot be used as a length measuring unit (length measuring drum), and it is necessary to provide a length measuring device separately from the storage drum.
[0004]
Conventionally, various types of weft length storage devices have been proposed. FIGS. 5 and 6 show an example of such a case. FIG. 5 shows an example of a non-split rotary drum type in which a length measuring device 41 is provided at one end of a storage drum 39. FIG. Are provided separately from the storage drum 39a.
[0005]
In FIG. 5, a length measuring drum 42 is integrally provided on the non-yarn unwinding side of the storage drum 39, and a length measuring roller 43 is in contact with the length measuring drum. The yarn 44 is sandwiched between the length measuring drum 42 and the length measuring roller 43, sent out to the length measuring drum 42, and transferred to the storage drum 39 by the yarn guide 45. The yarn wound around the storage drum 39 is locked by a yarn pin 8 that protrudes and retracts at the yarn unwinding side end of the drum, and the stored yarn is unwound when the yarn pin 8 is retracted. It is shut and weft inserted. In this structure, since the length measuring drum cannot be divided, a divided drum type structure cannot be adopted.
[0006]
A structure has been proposed in which the yarn end is held by an airflow flowing in the direction of rotation of the drum instead of the yarn-pin 8, and the length of the stored yarn can be continuously changed. Requires additional power and increases the running cost of the loom.
[0007]
FIG. 6 shows a structure in which a yarn is wound around a divided fixed drum 39a by a rotating yarn guide 46. After the length of the yarn 44 is measured by the length measuring device 41, the yarn 44 is sent out from a yarn outlet 46 a that is swirled outside the storage drum 39 a through a hole of the swirling yarn guide 46 and wound around the drum 39 a. In general, the engaging pin 8 is protruded and retracted by a solenoid 38 provided outside the drum. The length measuring device 41 clamps the yarn 44 between the length measuring roller 47 and the pressing roller 48 in contact with the length measuring roller 47, and controls the sending length of the yarn by controlling the rotation speed of the length measuring roller 47. This structure is characterized in that the length of the stored yarn can be freely changed by adopting a divided drum structure. However, since the length measuring device 41 needs to be provided separately from the storage drum 39a, the device cost is increased, and there is a trouble that the yarn lengths of both the length measuring device and the storage drum need to be set.
[0008]
The length of the yarn sent out by the length measuring roller 47 or the length measuring drum 42 needs to be adjusted to a length corresponding to the circumference of the storage drums 39 and 39a. 5, the yarn length can be adjusted by the diameter difference between the storage drum 39 and the length measuring drum 42. However, in the one shown in FIG. 6, the length measuring device 41 and the storage drum 39a are separate bodies. Therefore, the adjustment of the yarn length becomes very troublesome, and it is necessary to prepare and replace the length measuring rollers 47 having various diameters. There is a problem that the cost of the length measuring device 41 is increased, such as a need for control for accurate synchronization.
[0009]
On the other hand, Japanese Unexamined Utility Model Publication No. 58-97188 discloses a non-split fixed drum type in which a thread is wound around an annular groove configured to increase frictional resistance as a length measuring section. . The annular groove has a structure in which a threading group having an inclined surface is provided on an outer peripheral portion of a facing surface of two feed plates which are attached so that a gap can be adjusted. Is provided with a yarn end presser that gives unwinding resistance. This structure eliminates the disadvantage of the conventional structure of FIG. 6 that the length measuring device becomes expensive, but the operation of setting the weft length of the first pick according to the weaving width at the time of restart after the loom is stopped. However, there is a problem that the weaving width is fixed because the storage length of the weft yarn cannot be changed.
[0010]
[Problems to be solved by the invention]
As shown in the above-mentioned conventional example, there are various structures in the weft length measuring and storing device, each of which has advantages and disadvantages. Therefore, the present invention has a low apparatus cost, does not increase the running cost, makes it easy to finely adjust the yarn feed rate (the ratio between the measured length and the stored length), and stores the yarn according to the weaving width. The length of the loom can be easily changed, weft insertion can be performed between free flight and subsequent constrained flight, and operation at restart after a stop is easy. It is possible to start from around 180 degrees crank angle where the beating force can be kept constant, and the length measurement length is automatically adjusted when the storage length of the yarn is changed. It is an object to obtain a possible weft length storage device.
[0011]
[Means for Solving the Problems]
A weft length measuring and storing device for a fluid jet loom according to the first aspect of the present invention, which solves the above-mentioned problem, has a meandering friction groove 2 provided on the outer periphery of a yarn winding side of a storage drum 1 and guides a yarn to the meandering friction groove. A weft length measuring and storage device provided with a yarn outlet 37 to a first yarn guide 3 and a yarn winding pin 8 which protrudes and retracts at a predetermined crank angle at one position on the yarn unwinding side outer peripheral end of the storage drum 1 and stops the loom. A yarn removing device 4 is provided that sometimes moves the yarn outlet 37 or the first yarn guide 3 toward the storage drum 1 and returns the yarn outlet or the yarn guide to a position tangent to the meandering friction groove after the rotation of the loom starts. Things.
[0012]
The weft measuring and storing device for a fluid jet loom according to the second aspect of the present invention is configured such that the storing drum 1 is divided in the circumferential direction and the divided pieces 1a are provided so as to be movable and fixed in the radial direction, thereby storing the yarn. In the weft length measuring and storing device in which the length can be changed, a meandering friction groove 2 is integrally provided on the outer periphery of the yarn winding side end of each divided piece 1a of the divided storage drum, and the yarn is unwound from the storage drum. One of the outer circumferences is provided with a threading pin 8 which moves forward and backward at a predetermined timing.
[0013]
According to a third aspect of the present invention, in the weft length measuring and storing apparatus according to the first or second aspect, the storage drum 1 is a rotary drum that rotates synchronously with the rotation of the loom.
[0014]
According to a fourth aspect of the present invention, in the weft length measuring and storing apparatus according to the third aspect, the engaging pin 8 is urged in a protruding direction by a centrifugal force accompanying the rotation of the storage drum 1, and the storage drum and the predetermined rotation of the storage drum The cam disk 28 is provided to rotate in a ratio and draw the engaging pin in the immersion direction.
[0015]
The meandering friction groove referred to here is such that the yarn is meandered in the groove by alternately providing contact pieces that contact the yarn wound in the groove on opposite sides of the circumferential or arc groove. . Since the yarn zigzags in the groove, the yarn is prevented from slipping in the groove, and the yarn having a length corresponding to the diameter and rotation of the grooved drum is sent to the storage drum.
[0016]
[Action]
When the loom stops due to a thread break, etc., after removing the defective yarn, one pick weft is manually pulled out and the loom is restarted.At this restart, the beating force on the manually drawn yarn decreases. Then, the feed rate of the weft of the first pick after the restart is changed, so that the weft on the drum is loosened and the weft overlaps on the drum. According to the configuration of the first aspect, when the loom stops, the first yarn guide 3 moves to the storage drum side to prevent the manually drawn yarn from passing through the meandering friction groove 2. Can be freely drawn out. Then, when the loom is restarted, the yarn is not sent out until the yarn end is locked by the yarn engaging pin 8, so that the loom can be restarted from a small crank angle (for example, 180 degrees) and restarted. In addition to eliminating the limitation of the crank angle at the time, the stroke of the first beating can be increased to increase the beating force. Then, after the weaving pin 8 projects and the winding of the weft around the storage drum 1 is started, the first yarn guide 3 returns to the tangent to the meandering friction groove 2 and starts the length measurement. Is fed onto the drum and loosened, so that the yarns do not overlap.
[0017]
According to the weft length measuring and storing device of claim 2, in the weft measuring and storing device provided with the length measuring unit integrated with the storage drum 1, the weft length is adjusted according to the weaving width by adopting a divided structure of the drum. A device that can be easily changed can be obtained. Since the meandering friction groove 2 serving as the length measuring portion is provided integrally with each of the divided pieces 1a, if the storage length is changed, the length measuring length is also changed at the same time. Becomes easier. That is, the length of the measured length cannot be changed in the structure of FIG. 5 or the Japanese Utility Model Application Laid-Open No. 58-97188, and the length measuring device 41 and the storage of the structure of FIG. This solves all the problems that the length of the drum 39a is individually changed and the two are matched, and that the length measuring device 41 is expensive.
[0018]
Further, by adopting a rotary drum type structure having the structure of claim 3, the unwinding resistance of the weft is reduced, and a stable and uniform weft tension is obtained. According to the fourth aspect of the present invention, the spinning pin 8 is urged in the protruding direction by using the centrifugal force. Therefore, it is possible to simplify the structure of the divided rotary drum, which tends to have a complicated internal structure. it can.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 3 show a first embodiment of a rotary drum type. FIG. 1 is a side view, FIG. 2 is a sectional side view, and FIG. 3 is a front view showing internal members. In FIG. 1, 1 is a storage drum, 2 is a meandering friction groove integrally formed on the outer peripheral end of the storage drum on the yarn winding side, 3 is a first yarn guide, and the first yarn guide is supported by a solenoid 4 by a fulcrum pin. It is mounted on the tip of a swing arm 6 that swings around five turns. The first yarn guide 3 is moved by the swing of the swing arm 6 to a position 3 on the tangent to the meandering friction groove 2 and a position 3a on the storage drum 1 side deviating therefrom. Reference numeral 7 denotes a second yarn guide for transferring the yarn in the meandering friction groove 2 to the storage drum 1 side; 8, a thread pin which protrudes and disappears at one location on the unwinding side outer peripheral end of the storage drum 1; It is a fixed cap.
[0020]
The weft yarn is guided from the yarn supply source 49 to the first yarn guide 3 through the tension adjuster 10. The weft unwound from the storage drum 1 is guided to a weft insertion nozzle 13 via a yarn guide 11 and a clamper 12.
[0021]
In FIG. 2, reference numeral 14 denotes a hollow rotary shaft that rotates synchronously with the rotation of the loom, and reference numeral 15 denotes a drum holder fixed to the rotary shaft. The storage drum 1 and the divided piece 1a obtained by dividing the meandering friction groove 2 integral with the storage drum 1 into four parts in the circumferential direction are fixed to the drum holder 15 and the rear side thereof, and then are mounted so as to be movable and fixed in the radial direction by a flange 16. ing. Specifically, each divided piece 1a is fixed by a radial guide 17 provided on the front surface of the drum holder 15 and a bolt 18 inserted in a radial long hole provided on the rear flange 16. A pin 19 provided on the front surface of each divided piece 1a is fitted into a scroll groove 21 (see FIG. 3) of a scroll disk 20 which is inserted into the rotary shaft 14 so as to be relatively rotatable.
[0022]
A yoke plate 22 is inserted into the front surface of the scroll disk 20 so as not to rotate relative to the rotary shaft 14. The scroll disk 20 and the yoke plate 22 are fastened by a nut 23 at the tip of the rotary shaft 14. Is fixed.
[0023]
A cam shaft 25 is supported in the hollow hole of the rotating shaft 14 by bearings 24 at both shaft ends. The cam shaft 25 is connected to the rotation shaft 14 by a gear train 26 at the base end, and rotates at a constant rotation speed ratio with respect to the rotation shaft 14. In the illustrated embodiment, the rotating shaft 14 rotates four times faster than the crankshaft of the loom, and the camshaft 25 rotates five times faster.
[0024]
The above-mentioned cap 9 is fixed to the tip of the cam shaft 25, and the guide disk 27 and the cam disk 28 are fixed to the back of this cap. At the center of rotation of these members, there is provided a recess 29 that opens to the back side, and the nut 23 is located in this recess. The guide disk 27 is provided to prevent the yarn unwound from the storage drum 1 from falling into the space between the divided pieces 1a.
[0025]
As shown in FIG. 3, fulcrum pins 31 of a seesaw link 30 are fixed to both ends of the yoke plate 22, a cam roller 32 is pivotally supported at one end of the seesaw link 30, and a pin holder 33 is provided at the other end. Is installed. On the pin holder 33 of one seesaw link, the above-described engaging pin 8 is mounted. Nothing is attached to the pin holder of the other seesaw link. When the drum rotates, the cam roller 32 comes into contact with the outer periphery of the cam disk 28 due to the centrifugal force acting on the threading pin 8. On the other hand, in the cam roller without the engaging pin, the cam roller 32 is separated from the cam disk 28 by centrifugal force due to the weight balance around the fulcrum pin. It is not necessary to provide two seesaw links 30 since the threading pin 8 needs to be provided only at one place on the circumference of the drum. However, in this embodiment, the rotation balance of the drum and the cam roller 32 are used as a spare in case of damage. In addition, two attachment positions of the engaging pin 8 are provided.
[0026]
The thread pin 8 protrudes from the peripheral surface of the storage drum 1 due to centrifugal force caused by the rotation of the drum, enters when the convex portion of the cam disk 28 rotates to push up the cam roller 32, and is wound around the storage drum 1. Unwind the weft. Then, when the crank angle of the loom reaches a predetermined angle (for example, 270 degrees), the convex portion of the cam disk 28 passes through the cam roller 32, and the engaging pin 8 projects.
[0027]
Next, the length measuring and storing operation of the weft in the above-described embodiment device will be described. During operation of the loom, the first yarn guide 3 is located on a tangent to the meandering friction groove 2. The yarn that has passed through the first yarn guide 3 is wound around the meandering friction groove 2 by approximately one-half to three-quarters and is guided from the second yarn guide 7 to the storage drum 1. During weft storage, the yarn pin 8 projects and locks the leading end of the yarn, so that the yarn that has passed through the second yarn guide 7 is stored while being wound around the storage drum 1. The meandering friction groove 2 is provided with alternately provided protruding pieces 2a having oblique sides each having a V-shaped groove cross section from both side walls of the groove, and the yarn guided into the groove is provided with protrusions on both sides. The tape is wound in the groove in a meandering state by alternately contacting the pieces, slippage is prevented by friction with the protruding pieces, and a yarn having a desired length according to the diameter and the number of rotations of the drum is measured. The protruding pieces 2a can be provided intermittently in groups of a plurality. In the example of the drawing, a set of three protruding pieces 2a is arranged at both ends and the center of the groove of each divided piece. The ratio of the measured yarn length to the stored yarn (feed ratio) can be adjusted by adjusting the tension of the tension adjuster 10.
[0028]
The stored yarn is unwound from the storage drum 1 and travels when the weft insertion flow is jetted from the nozzle 13 at a predetermined weft insertion timing and the engaging pin 8 is immersed. When the stored yarn is unwound, the yarn is guided from the second yarn guide 7 directly to the yarn guide 11 without passing through the storage drum. In this state, the length of the yarn is measured by the rotation of the meandering friction groove 2. The flying speed of the weft is changed to a restricted flight. When the flying is completed, the clamper 12 closes, the engaging pin 8 projects again, and thereafter, the yarn sent out from the meandering friction groove 2 is wound around the storage drum 1 and stored.
[0029]
When the loom stops, the solenoid 4 operates to move the first yarn guide 3 to the storage drum 1 side. In this state, the yarn no longer passes through the meandering friction groove 2, so that the yarn can be pulled out freely and manual weft insertion is easy.
[0030]
Then, when the loom is restarted, the yarn engaging pin 8 projects at a position of a predetermined crank angle with the rotation of the storage drum 1 and the cam disk 28, and starts winding the yarn around the storage drum 1, and then the solenoid 4 is turned on. By operating and returning the first yarn guide 3 to the tangent to the meandering friction groove 2, the length measurement of the yarn is started by the meandering guide groove.
[0031]
At this restart, the yarn does not pass through the meandering friction groove 2 until the yarn engaging pin 8 projects and the storage of the yarn is started, so that the yarn is not over-fed on the storage drum 1 and loosened. Therefore, the loom can be restarted at the position of the free crank angle.
[0032]
FIG. 4 is a side view schematically showing a fixed drum type second embodiment. In the fixed drum type, the bobbin arm 35 rotates, and the storage drum 1 and the meandering friction groove 2 are stopped. The yarn is guided to the meandering friction groove 2 from the yarn outlet 37 at the end of the bobbin arm 35 through the center of the rotating shaft 36, and the front end of the bobbin arm functions as the first yarn guide 3 of the first embodiment. ing. The storage drum 1 is divided into four parts in the circumferential direction similarly to the one shown in FIG. 1, and each divided piece 1 a is movable and fixed in the radial direction. The rotation and the axial position are fixed by the attraction force of the magnets 50a and 50b. Since the meandering friction groove 2 is provided in each of the divided pieces 1a, the change in the length of the stored yarn and the change in the length of the measured yarn are performed simultaneously, as in the first embodiment. . In the fixed drum type, the engaging pin 8 can be protruded and retracted from the outside of the drum 1 by the solenoid 38 and the like. The rotating shaft 36 can be rotated synchronously with the loom by being connected to the loom via a speed increasing device. However, a structure in which an independent motor is provided to synchronize with the loom rotation by electric synchronous control is provided. You can also. In this structure, a second yarn guide 7 for transferring the yarn from the meandering friction groove 2 to the storage drum 1 is also provided on the yarn winding arm 35. In the embodiment of FIG. 4, when the loom is stopped, the yarn outlet 37 is moved to the storage drum 1 side. The magnet 50b is moved in the axial direction by the solenoid 4, and the drum 1 is moved in the axial direction by the attraction force of the magnets 50a and 50b. A structure is employed in which the yarn outlet 37 is moved backward to move toward the storage drum 1 relatively.
[0033]
Also in the second embodiment, the leading end of the bobbin arm 35 moves to the storage drum 1 side when the loom stops, enabling the manual weft to be pulled out, and the weft until the engaging pin 8 projects when restarting. Since the feeding operation is not performed, the length measurement error of the weft length of the first pick after the restart can be minimized, and the loom can be restarted from a position of a free crank angle. This makes it possible to easily restart the loom and achieve the same operation and effect as in the first embodiment, in which a sufficient beating force can be applied from the beginning.
[Brief description of the drawings]
FIG. 1 is a side view showing a first embodiment of a rotary drum type. FIG. 2 is a cross-sectional side view of a main part of the apparatus of FIG. 1. FIG. 3 is a front view showing an internal structure of FIG. FIG. 5 is a side view schematically showing a second embodiment of the formula. FIG. 5 is a side view showing an example of a non-split rotary drum type conventional device. FIG. 6 is a side view showing an example of a split fixed drum type conventional device. Explanation of reference numerals]
DESCRIPTION OF SYMBOLS 1 Storage drum 1a Divided piece 2 Meandering friction groove 3 First yarn guide 4 Solenoid 8 Yarn pin 28 Cam disk

Claims (4)

A weft comprising a meandering friction groove (2) provided on the outer periphery of the yarn winding side of the storage drum (1) and a yarn outlet (37) or a first yarn guide (3) for guiding the yarn to the meandering friction groove; In the length measuring storage device, a storage pin (8) is provided at one position on the yarn unwinding outer peripheral end of the storage drum (1) at a predetermined crank angle, and the yarn outlet (37) or the first yarn is provided when the loom is stopped. A yarn removing device (4) for moving the guide (3) to the storage drum (1) side and returning the yarn outlet or the yarn guide to the tangent line of the meandering friction groove after the rotation of the loom starts. The weft length storage device of a fluid jet loom. In a weft length measuring and storing device in which the storage drum (1) is divided in the circumferential direction and each divided piece (1a) is provided so as to be movable and fixed in the radial direction so that the length of the stored yarn can be changed. A meandering friction groove (2) is integrally provided on the outer periphery of the yarn winding side of each divided piece (1a) of the divided storage drum, and the storage drum moves forward and backward at a predetermined timing to one location on the yarn unwinding side of the storage drum. A weft length measuring and storing device for a fluid jet loom, comprising a yarn pin (8). The weft length storage device according to claim 1 or 2, wherein the storage drum (1) is a rotary drum that rotates synchronously with the rotation of the loom. A cam disk which is urged in a projecting direction by a centrifugal force caused by the rotation of the storage drum (1), rotates at a predetermined rotation ratio with the storage drum, and draws the yarn pin in the immersion direction. The weft length measuring and storing device according to claim 3, further comprising (28).

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