Textiles: manufacturing – Warp preparing or handling – Machine replenishing
Patent
1997-05-07
1998-09-15
Falik, Andy
Textiles: manufacturing
Warp preparing or handling
Machine replenishing
D03J 114
Patent
active
058061568
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a method of drawing a warp thread in a looms reed. This reed drawing-in apparatus and method allows a warp thread to be properly and smoothly drawn Into a respective gap between adjacent dents of a reed where the dents are laid with extremely high density. Threads are not cut off during the reed drawing-in operation. A threader has a greater useful life. This invention serves to streamline reed drawing-in especially for the production of high-density fabrics.
2. Prior Art
Recently, for use as a plotting scale for manufacturing electronic parts, much attention has been drawn to a plain fabric which is woven by accurately intercrossing weft and warp threads of extremely thin status with precisely equal interval between adjacent threads. However, in order to weave this type of fabric, a high-density reed must be used. The number of dents in some extreme cases reaches 400 dents/inch. The dents are finely and densely disposed. With the prior reed drawing-in apparatus, it was impossible to draw a warp thread into such a high-density reed as mentioned above. Thus, warp threading into such a high-density reed depended on manual labor by an experienced and skillful worker.
An apparatus has been proposed in Japanese Patent Application Laid-Open No- 61-502472 wherein a gap between adjacent dents is probed by projecting light on the reed surface so as to analyze light which has got through an interval between adjacent reed-dents and a warp thread is mechanically drawn into said gap. However, with such a prior apparatus as mentioned above, it can probe said gap well, but the problem of smoothly drawing an extremely thin warp thread into said gap without doing damage on said warp thread remains unsolved so that it is still far from industrial applicability.
On the other hand, the present applicant has proposed a high-precision reed drawing-in apparatus in Japanese Patent Publication No.8-16301 which comprises a search light source irradiating search light onto a reed, a CCD camera picturing the reed surface irradiated with the search light, a microcomputer for calculating the distance to a target gap between adjacent dents on the basis of a picture signal output from said CCD camera and for outputting a numerical movement command signal in proportion to the calculated distance, and a threader having a hook part which is formed thinner than the gap between adjacent dents of the reed, wherein the hook part is thrust into the gap so as to hook a warp thread and draw it into said gap, and a work carrier for carrying said search light source, CCD camera, microcomputer and threader which sequentially moves from one gap to another on the reed in accordance with said numerical movement command signal so as to draw a warp thread into a target gap with the hook part of the threader. With this apparatus, because of the precisely associated movement between the accurately moving work carrier and the thin hook part of the threader in reed drawing-in operation, it has become possible to properly draw a warp thread even into a high-density reed with 300 dents/inch.
However, even with the high-precision reed drawing-in apparatus as mentioned above, as the density of dents becomes higher, such as 400 dents/inch, the hook part of the threader must be thinner and thinner. Therefore, the tip end of the hook part trembles under the influence of vibration and so on. This causes drawing-in errors of the warp thread or breakup of the hook part so that the operation needs to be frequently suspended and a number of broken hook parts must be replaced.
DISCLOSURE OF THE INVENTION
The above-mentioned problems encountered in the reed drawing-in apparatus described in Japanese Patent Publication No.8-16301 and proposed by the present applicant are solved by this invention. The present invention provides a reed drawing-in method whereby a warp thread can be properly and smoothly drawn into a respective gap between adjacent dents of even an extremely high-density reed w
REFERENCES:
patent: 4748568 (1988-05-01), Tobler
patent: 4894893 (1990-01-01), Okuda
patent: 4974301 (1990-12-01), Beerli et al.
patent: 5353487 (1994-10-01), Choh et al.
Hashizume Kenji
Sakaguchi Yoshiro
Falik Andy
Hashizume Kenkyusho Co., Ltd.
Snider Ronald R.
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