Textiles: manufacturing – Warp preparing or handling – Machine replenishing
Patent
1990-09-21
1992-05-12
Schroeder, Werner H.
Textiles: manufacturing
Warp preparing or handling
Machine replenishing
282031, 28205, 28206, 28207, D03J 114
Patent
active
051115603
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an automatic warp threading apparatus for automatically threading warps through the eyes of heddles from one side of a row of multiple parallel heddles.
BACKGROUND ART
An operation for threading warps through the eyes of heddles in a weaving machine has heretofore been carried out manually one warp after another by a skilled worker using a spatula. This manual warp threading operation, however, needs a great deal of perseverance and is inefficient. For this reason, automatic warp threading apparatus have been diffusing in recent years.
One example of such automatic warp threading apparatus is shown in FIG. 7 (perspective view) which is described in Utility Model Publication Kokai No. 53-64760.
In this apparatus, warps Y are drawn from a beam 52 supported on a carriage frame 51, and are stretched between an upper harness rail 53 and a lower harness rail 54. A drive and control box 56 is mounted on a machine frame 55 parallel to the carriage frame 51. By operating various parts contained in this drive and control box, selection of warps Y and selection of heddles H and drop wires D are effected, and the warps are drawn in through the eyes of the heddles H and drop wires D and a reed R.
This warp threading apparatus has a drawing-in needle 57 formed of an elastic metal strap and wound into a drum 58, which needles springs out in a tangential direction of the drum 58 for a drawing action, moves through the eye of a heddle, hooks a warp selected and separated from the group of warps, and returns into the drum, thereby to effect threading.
With this automatic warp threading apparatus, however, the drawing-in needle having a hook reciprocates through the eye of a heddle, wherefore the eye of a heddle is likely to be damaged by the drawing-in needle. When the eye of a heddle is damaged, the thread becomes caught by the damaged part and breaks during a weaving operation. This results in a reduced weaving efficiency and an increased possibility of producing defective goods due to flaws in the material. There will occur further problems that the heddles have a reduced durability and the apparatus involves a high running cost.
Moreover, since the long drawing-in needle is passed through the narrow eyes, drawing-in errors, namely collisions of the forward end of the needle with the eyes of the heddles, tend to take place. Thus there is also the problem of damage occurring wherein the hook at the forward end of the needle becomes bent.
DISCLOSURE OF INVENTION
In order to solve the above-noted problems of the prior art, an automatic warp threading apparatus according to the present invention as set forth in the introduction hereof is characterized in that a thread path table, a stationary base and a thread feed table movable on the stationary base are disposed at one side of the row of heddles, the thread feed table carrying a thread feeder, the thread feeder including finger members for holding the warps arranged on said thread path table, and a jet nozzle is attached to the finger members for ejecting a gas.
Its function and effect are as follows:
In the automatic warp threading apparatus according to the present invention, warps wound on a beam are arranged on the thread path table, a warp is clamped by the finger members attached to the thread feeder, the clamped warp is moved to a position immediately in front of the eye of a heddle, and the jet nozzle attached to the finger members ejects air or other gas flows, thereby to pass the warp through the eye of the heddle.
Thus, the automatic warp threading apparatus of this invention does not damage the most valuable eye of the heddle by inserting the drawing-in needle directly into the eye of the heddle as in the apparatus according to the prior art. This allows extended life of the heddle, eliminates thread breakage due to the damage of the eye of the heddle, promotes weaving efficiency, reduces defective goods, and further reduces threading errors, thereby to produce the effect of leading to a marked improvement in the
REFERENCES:
patent: 4499638 (1985-02-01), John et al.
patent: 4543696 (1985-10-01), John et al.
patent: 4723346 (1988-02-01), Tachibana et al.
patent: 4748568 (1988-05-01), Tobler
patent: 4894893 (1990-01-01), Okuda
Kabushiki Kaisha Nishiki
Mohanty Bibhu
Schroeder Werner H.
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