JPH043457B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a fluid injection type loom, and more particularly to an air pool type weft storage device thereof.

Prior Art In this type of weft storage device, the weft is continuously drawn out from a weft supply source by a length measuring device and is stored for a predetermined length in a pool portion by an air flow from a pool nozzle. However, if a mistake occurs on the loom, such as a weft break, a warp break, or a problem in supplying the weft to the loom, the loom should be stopped, the loom should be corrected according to the prescribed procedure, and then the loom should be removed. It is necessary to set the start timing (approximately 300° in crank angle) and then restart. Regarding the weft storage device, it is customary to insert a slightly longer weft for the first pick after restarting the machine. It is necessary to correct it over a long period of time.

This correction amount l _p is calculated as follows, where l is the weaving width, T _{s is} the start timing angle, and T _c is the closing timing angle of the gripper provided near the pool part to enable storage and release of the weft in the pool part. It is given by l _p =l×T _s −T _c /360°.

Of course, if the correction amount l _p is too small, the first pick will be too short; if it is too long, for example, the weft jetting force from the main nozzle to inject air for weft insertion along with the weft may cause the weft to become too long. As a result, the weft jetting force is reduced and becomes weaker than the weft jetting force by the pool nozzle, resulting in problems such as an escape phenomenon in which the weft in the main nozzle is pulled toward the pool nozzle. In addition, even if the correction amount l _p is appropriate, especially in the case of strongly twisted yarns, the weft yarns in the pool part may curl when no tension is applied to the yarns, resulting in a so-called chattering condition. It's easy to happen.

Currently, if you restart the machine with the weft in a warped state, it will cause a fabric defect, so you must correct the warp by hand, or restart the machine while holding the weft that is prone to warp by hand. The troublesome work of starting the engine was necessary.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a weft storage device that eliminates the need for the above-mentioned troublesome operations and improves operability.

Structure of the Invention For the above purpose, the weft storage device of the present invention is provided with a weft gripping device at a predetermined position away from the weft storage area of the pool portion, and the weft yarn in the pool portion, that is, the correction yarn is It is characterized in that it is gripped by a weft gripping device to prevent the occurrence of a stiffness state.

In a preferred embodiment, the weft gripping device is movably attached to the pool section, so that the amount of correction can be easily adjusted, and the pool section is provided with a scale or the like to indicate the amount of correction. I can do it.

Embodiment 1 FIG. 1 shows a case where the present invention is implemented in a weft storage device 6 that uses a plate-like member 6a as a pool portion. In FIG. 1, a weft yarn Y drawn out from a bobbin 5, which is a weft yarn supply source, passes through a tension applying device 4 and then reaches a length measuring device L. In the length measuring device L, the weft yarn Y is first passed through a separator. 1 and then wound around a measuring roller 2, and after being wound several times between the two, it is sent out to an air injection nozzle for weft storage, ie, a pool nozzle 3, while in contact with a separator 1. With the continuous rotation of the length measuring roller by the drive drum 10, the weft Y
is injected from the pool nozzle 3 to the weft storage device 6
After being stored in a loop shape on the pool portion 6a (dashed line a), the gripper 7 is released during the weft insertion movement, and the stored weft shown by the chain line a passes through the guide 8 and is moved by the action of the main nozzle 9. The gripper 7
holds the weft yarn, so the accumulation of the weft yarn starts again.

In such a fluid injection type loom, when a mistake as described above occurs, the machine is stopped, the mistake is dealt with according to a predetermined procedure, and then the machine is set to the start timing. At this time, the weft is in the state shown by the chain line b, but in order to make the first pick longer, the drive drum 10 is moved by a means not shown in the figure before restarting the machine, and the weft is adjusted by a correction amount l _p is given, resulting in the state shown by solid line c. Therefore, the correction amount l _p is the value of the pool nozzle 3 in the state indicated by the solid line c.
It can be considered that this corresponds approximately to the length of the weft from the tip of the weft to the guide 8.

At this point before the start of the machine, substantially no tension is applied to the weft yarn in state c. Therefore, if the weft yarn gripping device 11 according to the present invention, which will be described later, is not present, the weft yarn will not be able to maintain the twist applied thereto. Dashed line d
This causes the vibration condition shown in .

In order to prevent the occurrence of this vibration state d, the weft storage device 6 of the present invention has a mounting portion 11a and a gripping portion 11b.
A weft gripping device 11 is provided. Mounting part 1
Reference numeral 1a consists of a step-shaped bracket, and the lower vertical portion of the bracket is attached to a flange 6b of a pool portion 6a so as to be adjustable in position in the direction of arrow 12 by appropriate conventional means. It is attached to the upper horizontal part of the bracket of the gripping part 11b by means such as screws 13. The configuration of the grip portion 11b is similar to that of a second embodiment described later, and will be described in connection with the second embodiment.

The weft gripping device 11 is disposed at a position away from the weft storage area of the pool portion 6a, that is, from the pool surface of the pool portion where the weft is stored as shown by the chain line a during normal operation, and from the area near it. , the weft thread gripping device 11 does not obstruct the movement of the weft threads during normal operation of the machine.

Note that 14 is a scale provided on the flange 6a of the pool portion 6 to indicate the position of the weft gripping device 11, that is, the correction amount _lp .

Embodiment 2 In Embodiment 2 shown in FIGS. 2 to 4, a well-known pool pipe 6a' is used as the pool part, and a weft gripping device 11' is installed on the pool pipe. Example 1 except for the detailed structure of the attachment part 11a'
can be considered to be substantially the same.

In FIGS. 2 to 4, the mounting portion 11a' includes mounting members 15 and 16 divided into two, and a bracket 19 that is attached to the mounting member 15 with bolts 17 and nuts 18. ，
16 is the bolt 1 with the pool pipe 6a' sandwiched therein.
7. It is attached by a nut 18 so that its position can be adjusted in the direction of arrow 12'. The gripping portion 11b' attached to the tip of the bracket 19 by a screw 13' and a nut 20 is the same as that in the first embodiment, and includes a rigid upper gripping piece 21 made of, for example, an iron plate, and an elastic, e.g. It has a lower gripping piece 22 made of a spring plate, and the tips of both gripping pieces are designed to facilitate gripping of the weft yarn.
It opens in a dogleg shape.

14' is the position of the weft gripping device 11', that is, the correction amount
l This is a scale provided on the outer surface of the pool pipe 6a' to indicate _p . Further, as in the first embodiment, the weft gripping device 11' is disposed at a position away from the weft storage area of the pool pipe 6a'.

Note that the attachment part 11a' of the weft gripping device 11' can be attached to the pool pipe 6a' by constructing the attachment part in the shape of a flexible clip and using a spring instead of using bolts and nuts as shown in the figure. It may also be done by force.

Next, the operation of the weft storage device according to the present invention will be explained. Since the functions of the first and second embodiments are the same, the operation will be explained with reference to FIG. 1.

First, after dealing with the error that has occurred according to a predetermined procedure, the machine is set to the start timing (for example, at a crank angle of about 300 degrees). Next, the weft gripping device 11 is moved to a position corresponding to the correction amount l _p determined according to the above-mentioned formula l _p =l×T _s −T _c /360°.
4 and fix in this position. After that, the drive roller 10 is moved in small steps to supply the weft yarn, and the weft yarn in the state shown by the chain line b on the pool surface becomes in the state c.
In addition, the weft in state C is corrected so that the weft in the state
1 and 22 (Fig. 4) by hand, and lightly grip the weft in state c so as not to cause any vibration.

When the machine is restarted in this gripping state, the weft yarn is pulled out from the bobbin 5 by the continuous rotation of the drive drum 10 and sent out by the air jet from the pool nozzle 3, at the weft storage area of the pool part 6a, at the chain line e. As shown, the yarn is stored between the pool nozzle 3 and the weft gripping device 11. When the crank angle of the machine eventually reaches the release timing of the gripper 7 and the gripper is released, the weft is pulled in the direction of the arrow 23 by, for example, an air stream jetted from the main nozzle 9. , weft gripping device 11
The main nozzle 9 is easily and automatically released from the gripping portion 11b, and the first weft insertion by the main nozzle 9 is performed after restarting the machine.

Each subsequent weft insertion during normal operation is performed in the same manner as in the conventional case, and the weft gripping device 11 is not used.

Effects of the Invention As described above, according to the present invention, a weft gripping device is provided at a predetermined position away from the weft storage area of the pool portion, and the weft yarn in the pool portion is gripped by the weft gripping device prior to starting operation of the loom. This eliminates the need for manual correction of the weft warpage or the troublesome work of starting the machine while holding the stored weft by hand to prevent warpage, resulting in improved operability. be done. In particular, the necessity of the present invention is further increased in machines of the two-hand push button type, in which the machine cannot be started unless both of the two start buttons are pressed as a safety measure.

Furthermore, if the position of the weft gripping device is freely adjustable and has a scale that indicates the position, the correct amount of correction can be easily obtained, so there is no need to worry about the amount of weft being fed out being too long or too short. It is possible to prevent the above-mentioned troubles (running away from the pool, short runs) at the start caused by this.

[Brief explanation of drawings]

FIG. 1 shows the first weft storage device according to the present invention.
FIG. 2 is a perspective view of the second embodiment, FIG. 3 is an enlarged front view of the second embodiment partially shown in cross section, and FIG. 4 is a right side view of FIG. 3. . In the figure, 3 is a pool nozzle, 5 is a weft supply source (bobbin), 6 is a weft storage device, 6a and 6a' are pool parts, 11 and 11' are weft gripping devices, 11a and 11a' are attachment parts, and 11b and 11b' is a gripping part;
L is a length measuring device, and Y is a weft.

Claims (1)

[Claims] 1. In a weft storage device for a fluid jet loom, in which the weft continuously pulled out from the weft supply source by a length measuring device is stored in a pool part for a predetermined length by air flow from a pool nozzle, from the weft storage area of the pool part A weft storage device characterized in that a weft gripping device is provided at a predetermined position separated from the loom, and the weft gripping device grips the weft in the pool portion prior to the start of operation of the loom.