JPH0411041A - heddle - Google Patents

Abstract

PURPOSE:To improve efficiency of preparatory operation, by constituting a mail of heald made of a shape memory alloy, making the mail maintain a common long and narrow shape during weaving and deforming the main into a wide shape during threading to facilitate threading operation. CONSTITUTION:A heald is made by using a shape memory alloy such as titanium nickel, copper aluminum or gold cadmium. During threading operation, hot air is blown upon a mail of the heald, the mail is heated up to a given transformation temperature, deformed into a previously memorized wide shape and threading is carried out. After completion of the operation, the mail is vertically drawn, the mail is made into a long and narrow shape to avoid mutual interference of adjoining warps during weaving.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heddle (referred to as a wire belt) that moves warp threads up and down in order to create openings for weaving weft threads in the weaving process.

[Conventional technology and its issues]

Generally, a heddle is an annular eye (called a heddle) that is used to twist two wires and pass the warp through the center, as shown in Figure 1.
1 is formed, and loops 2.2 for hooking on the heald frame are formed at both ends of the wire.

As shown in the figure, the heddle 1 is usually formed in the shape of an elongated wave meter, and care is taken to prevent interference between adjacent warp yarns threaded through the heddle 1 during weaving. However, if the hem 1 is elongated as described above, there is a problem in that it is difficult to thread the thread in the yarn preparation step of the weaving process. In addition, machines are being developed to automate this threading work and save labor, but the small size of the heath 1 has been a bottleneck in mechanization.

[Means to solve the problem]

The heald of the present invention is intended to solve the above-mentioned problems, and includes making at least the healds for passing the warp threads made of a shape memory alloy,
It is characterized in that the heathes have a wide shape memory.

[Effect]

If the shape-memory alloy helts have a wide shape with a memorized shape, it will be easier to pass the thread through, and when woven, by deforming them into elongated shapes, interference between adjacent warp threads can be prevented.

〔Example〕

T1Ni, Cus Aj! , AuCd, and other alloys have the unique property of returning to their original shape by heating to a predetermined transformation temperature even if they are deformed at room temperature, so these alloys are called shape memory alloys. The healds are made using shape memory alloys.

When manufacturing a heald using a shape memory alloy, the entire heald may be made of the shape memory alloy, but only the heald 1 may be made of the shape memory alloy.
Using T1Ni alloy, the healds 1 are memorized into a circular shape as shown in FIG.

T1Ni alloy has high wear resistance and corrosion resistance, so it is suitable as a material from these aspects as well. In this way, threads can be easily threaded through the heath 1 whose shape is memorized in a circular manner by manual or mechanical methods.

After passing the thread through, if the heddle is pulled up and down to deform the heddle L into an elongated shape as shown in Figure 3, the heddle 1 becomes narrower, causing interference between the warp threads. There is no risk of this happening, and it functions as a normal heddle.If you want to rethread heddle 1, heat it to the transformation temperature by applying hot air to heddle 1, and it will return to its original circular shape. It becomes easier to thread the thread.

In the above examples, a unidirectional shape memory alloy with one transformation point was explained, but a bidirectional shape memory alloy with two transformation points can also be used, in which case the tensile Even without applying any external force, the heath 1 can be transformed into two forms, one for threading work and the other for weaving work, just by changing the temperature.

〔Effect of the invention〕

As described above, the heald of the present invention has the effect of facilitating threading and improving the efficiency of thread preparation work during weaving. Furthermore, the T1Ni-based shape memory alloy is rich in wear resistance and corrosion resistance, has a long life, and can reduce the occurrence of thread breakage.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view of the heddle, and FIGS. 2 and 3 are enlarged views of the heddle. 1...Headline. Figure 1! 3! ] l

Claims (1)

[Claims] A heddle characterized in that at least the healds for passing the warp threads are made of a shape memory alloy, and the healds have a wide shape memory.