JPH0364554A - Apparatus for moderating weft overtension in center tuck-in part of multiple spacing loom - Google Patents

Abstract

PURPOSE:To eliminate miss tuck and surely form center selvedges by locally curving picked weft yarn with a jet air stream and relaxing overtension in a position opposite to a center selvedge apparatus provided in a multiple spacing loom. CONSTITUTION:In a multiple spacing loom provided with one or more center selvedge apparatuses 2 arranged oppositely to a reed 1 within an inner region of a weaving width, weft yarn (F) picked at a prescribed timing is nipped with a pair of grippers 21 and 21 and the central part thereof is then cut with a cutter 22. The end of the aforementioned weft yarn (F) is subsequently passed through dents of the reed 1 by actuation of an air actuator 3, composed of an air nozzle, installed at a position opposite to the above-mentioned center selvedge apparatuses for tucking in the aforementioned ends of the weft yarn (F) between warp yarns to form the center selvedges and provided at the back of the reed 1. A jet air stream is blown in the vertical directions to locally form the above-mentioned picked weft yarn (F) into a curve (C) and relax overtension.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a weft overtension alleviation device in the center tuck-in section of a multi-width loom. By locally curving the inserted weft at the area facing the middle ear plasticizer, it is possible to stably tuck it in without creating excessive tension even if the weave shrinks during middle ear forming. This invention relates to a weft overtension alleviation device.

[Prior art and technical issues to be solved] A middle ear former is provided on one side facing the reed in the inner weave width region, and can be separated based on the middle ear formed by the middle ear former. Multi-width looms for weaving woven fabrics are well known in the art.

By the way, the common drawbacks of this type of multi-width looms are:
When weaving fabrics with large weave shrinkage, when the beaten weft is tucked in to form the middle ear during the weft insertion for the next pick, the pull of the temple tends to be lost. Excessive tension is generated in the weft due to the shrinkage of the weave, and the weft breaks before it can be gripped by the gripper, making it impossible to tuck in. This causes a problem in that a normal middle ear cannot be formed.

Although the above-mentioned problems caused by such weaving shrinkage can sometimes be improved by using temples with strong tensile strength, when weaving fabrics with especially large weaving shrinkages or fabrics using wefts with low tensile strength, It's not a solution.

Therefore, when attempting to weave this type of fabric by using a rapier loom with back weaving, conventionally, a part of the reed feathers 11 of the reed 1 in the part corresponding to the center tuck-in part is removed,
There has been a proposal to lift the weft F during beating by protruding a wedge-shaped thread guide G as shown in FIG. If this method is adopted, there is an inconvenience that the reed is limited by the reed threading width, and in addition, with such a reed blade removal method, even if it is to be used as a lead for an air jet loom, it is necessary to remove the reed blades and make the thread guide G protrude. The flow of the jet stream is disturbed at that part, making the behavior of the conveying weft unstable, resulting in problems such as normal weft insertion being unable to be guaranteed.

The present invention was made in view of the above-mentioned difficulties with conventional multi-width looms, and provides an appropriate amount of slack to the weft portion where the middle ear is to be formed without applying any excessive external force. A technical object of the present invention is to provide a weft excess tension relieving device in a center tuck-in portion that can relieve the tension caused by weaving shrinkage.

Another technical object of the present invention is to create a localized curve in the area where the middle ear of the weft is to be formed, without contact, and to prevent excessive tension due to weaving shrinkage.
An object of the present invention is to provide a weft excess tension relieving device for a center tuck-in part of a rear weaving loom.

Furthermore, another technical problem of the present invention is a ``device for relieving weft excessive tension in the center tuck-in section of a multi-width loom, which can be applied not only to air jet rooms, but also to target looms, rapier rooms, and shuttle rooms.'' ”.

[Means adopted to solve the problem]

The means adopted by the present inventor to solve the above technical problem will be described below with reference to the accompanying drawings.

That is, the present invention includes a middle ear former 2 on one side facing the lead l in the inner weaving width region, and weaves a woven fabric W that can be separated based on the middle ear formed by the middle ear former 2. A pneumatic means is adopted in which an air actuator 3 is provided to locally curve the weft F, which is inserted at predetermined timings, at a portion facing the middle ear forming device 2, for a conventionally well-known rear width weaving loom. By doing so, we have completed a weft overstrain relieving device in the center tuck-in section of a back width weaving loom that can satisfy the above-mentioned technical problems.

Therefore, a multi-width loom suitable for application of the present invention is an air jet loom, but a water jet loom,
It can be applied to both rapier rooms and shuttle rooms.

〔Example〕

The present invention will be explained in more detail below based on the embodiments shown in FIGS. 2 and 3.

In the drawing, what is indicated by reference numeral 1 is a reed, and a large number of deformed reed wings 11 whose central portions are curved in a concave shape are arranged in rows between the lead frames, and the concave portions 11a that are curved in a concave shape are parallel to each other. Weft insertion is carried out by flying the weft F jetted from a weft insertion nozzle (not shown) through a channel-shaped passage created by this process or with jet assistance from a plurality of sub-nozzles SN.

Then, by making a rocking motion of this lead L in the direction of the arrow, the inserted weft F is beaten to the front of the weft, and a woven fabric W--W of the rear width is woven.

Next, what is indicated by reference numeral 2 is the middle ear forming device, which tucks in the weft insertion weft F that has been beaten on the front surface of the lead L while the weft insertion of the next pick is being carried out to form the middle ear C5. The grippers 21 and 21 grip the inserted weft F, and the grippers 21 and 2
A cutter 22 cuts the weft F gripped by the gripper 21 at the center, and a gripper 21
and a shoeing needle (not shown) which is hooked between the end of the woven fabric and tucked in between the warp T-T of the woven fabric W to form the middle ear C5, and this tank bottom is conventionally known. be.

Further, the reference numeral 3 indicates an air actuator, and in this embodiment, it is configured as an air jet nozzle mounted on the back surface of the lead 1 via an adjustment holder 31 so that its position can be adjusted in the lead width direction. ing. Air jet nozzle 3 as this air actuator
is arranged in a part facing the middle ear forming device 2, and blows a jet air stream onto the weft F passing through the recessed part 11a on the front surface of the reed 1 through the gap between the reed blades 11 arranged in a row. , causing the weft F to form a local curve C. In this way, when the weft F is locally curved C at the relevant part, the gripper 2 of the middle ear former 2
Even if weaving shrinkage occurs in the part of the weft F held between the wefts 1 and 21, the shrinkage is absorbed by straight stretching of the curve C part and no excessive tension is created, and the cutter 22 moves the weft F in a stable state. is cut, and the end of the cut weft F is hooked on a tucking hook (not shown) and tucked in between the warps T and T of the woven fabric W to form the middle ear C5. In addition, the reference numeral 4 in FIG. 2 is a sub-nozzle SN that is appropriately arranged to assist the flight of the weft F jetted by the main weft insertion nozzle (not shown) and prevent it from stalling. The air noet is injected toward the end point of weft insertion.

By the way, regarding the air supply path of the air jet nozzle 3 and sub nozzle 4 in the above,
Although not particularly shown, a compressor (not shown) and the nozzles 3 and 4 are communicated with each other by a suitable hose or the like.

Although the device of this embodiment is generally constructed as described above, the present invention is by no means limited to the above-described embodiment, and various design changes are possible within the scope of the claims. For example, in the above embodiment, the air jet nozzle beam 1 as the air actuator 3
Although it is arranged at the rear of the weft F, it is also possible to arrange it at the upper or lower part of the front part of the lead 1 and blow a jet stream downward or upward to locally curve the weft F downward or upward. It is a design matter that can be adopted as appropriate in response to the design requirements, and in the above example,
Even if an air jet nozzle is adopted as the air actuator 3, it is not necessarily limited to an air nozzle that ejects a jet, and it is naturally possible to adopt an air suction device that causes the weft F to have a suction curve. In the examples, only an example in which the present invention is applied to an air loom is described, but it can be applied to various types of looms such as a water jet loom, a rapier loom, and a shuttle loom, and the present invention can be applied to any of them. Belongs to the technical scope.

[Effects of the present invention]

As explained above with reference to the embodiments, if the device of the present invention is applied to a back weft weaving loom, it is possible to form a local curve extremely gently without applying excessive external force to the inserted weft, and to eliminate excessive tension. Because of the unsoaking, stable conditions necessary for forming the middle ear are established, and it is possible to reliably form an orderly middle ear without causing tuck mistakes.Moreover, the device of the present invention uses an air jet room, It can also be used in multi-width mechanisms such as rapier rooms and shuttle rooms, and its range of use is extremely wide.

As described above, according to the present invention, the problem of weft overtension, which was an obstacle to the formation of the middle ear in conventional rear weaving looms, can be solved by utilizing the skillful general rule of nature of locally curving the weft using air pressure. In addition, it can be solved without sacrificing the performance of the loom itself, and the added parts are very simple and the cost burden is small, making it very practical and economical. It becomes possible to provide an advantageous multi-width loom.

2-m-middle ear former, 21-11 glissoper, 22--1 cutter 3--air actuator, 31.-adjust holder 4-m-sub nozzle SN.

C---<weft) curve, F---weft, C
5--1 middle ear, W--1 woven fabric.

Claims (5)

[Claims] (1) A middle ear forming device 2 is provided on one side facing the reed 1 in the inner area of the weaving width, and the middle ear forming device 2 is used to improve the middle ear CS and CS.
In a multi-width loom that weaves a woven fabric W that is separated by forming a
A weft overtension alleviation device in a center tuck-in portion of a multi-width loom, characterized in that an air actuator 3 is provided to locally curve C at a portion facing the middle ear forming device 2. (2) The air acuator 3 is an air nozzle installed on the back of the reed 1 facing the middle ear forming device 2, and locally curves the weft F by blowing a jet stream through the reeds of the reed 1. C Claims (
1) The weft overtension alleviation device described in 1). (3) The weft excessive tension relieving device according to claim (1) or (2), wherein the air actuator 3 is mounted such that its position can be freely adjusted in the lead width direction. (4) The air actuator 3 is an air nozzle installed on the beating side of the reed 1, and causes the weft F to curve C vertically by generating a jet stream in the vertical direction. Weft overstrain relief device. (5) The air actuator 3 is an air suction device installed on the beating side of the reed 1 facing the middle ear forming device 2, and is configured to locally move the weft F at a portion facing the middle ear forming device 2. The weft excess tension relieving device according to claim (1), wherein the weft excessive tension relief device is curved C.