Textiles: manufacturing – Warp preparing or handling – Machine replenishing
Patent
1991-05-09
1994-03-29
Crowder, Clifford D.
Textiles: manufacturing
Warp preparing or handling
Machine replenishing
28184, 289 2, B65H 6900, D04B 1562
Patent
active
052973239
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for automatically joining threads, consisting of a frame with a plurality of thread clamps and a carriage which can be driven step-wise horizontally, on which a thread joining system is provided; it relates also to a process for joining threads, and to an application of the device.
The automatic changing of threads of a large number of spools mounted on a frame or spool rack is very important to efficient processing.
A device called a spool changer is known, which permits taking threads from 50 to 100 spools. It is used for the production of a tubular knit test sample which is composed of short sections corresponding to the number of installed spools (W. Stein, Textile Horizons, (1988) pages 40-42). The test stocking serves for visual inspection or as a sample for a colorimetric evaluation of the sections after it has been dyed.
Although the known automatic spool changer satisfies requirements in many cases, it has a number of disadvantages. For example, the number of threads is limited to no more than 96. Frequent thread breakage at the clamps interferes with the otherwise rapid change frequency.
SUMMARY OF THE INVENTION
The invention is addressed to the problem of making available an improved device for the automatic, reliable changing of a large number of threads from different spools and for their step-by-step joining.
According to the invention, a thread guide tube is associated with each thread clamp at a certain distance vertically above the thread puller, the tube being in communication with a vertically movable vacuum duct.
The thread is given a permanent bias tension by the vacuum until it is taken up for the thread draw-in, and cannot spring back or otherwise escape. The thread is best held by suction until it is released by a thread severing means.
The thread guide tubes are fastened in a rail, equipped at the end of the thread entrance with a thread guide eyelet, and consist preferably of ceramic tubes. This has the advantage that the thread is drawn in cleanly when suction is applied.
At the exit of the thread guide tubes rubber diaphragms, are applied, so that, when the vacuum duct is coupled to the thread guide tubes the suction power can be loss-free all the way to the intake opening of the thread guide tubes.
The segmented arrangement of the vacuum blocks has the advantage that a certain number of threads can be held under uniform tension and can be manipulated with less energy overall. Each suction block is equipped with an injector nozzle and a thread removal hose.
It is advantageous to provide a lifting jack and a lifting plate. The lifting plate has the advantage that, after the vacuum duct docks at the thread guide tubes, all the thread clamps are opened by the lifting plate, thereby permitting the general pulling through of the threads.
It is desirable to use as the threading arm an air jack disposed on a carriage, which is in communication with the vacuum duct, and can pick up the free thread end between the entrance to the thread guide tube and the thread clamp. The air jack closes the thread clamp prior to a position shift and does not release it until the threading arm is in the pickup position, in order to close the next clamp after the position shift. The pneumatic pickup and transport of the thread has proven to be more advantageous and reliable than a mechanical gripping arm.
The movement of the threading arm is best controlled by a template. The thread is best threaded into the threading arm by suction from an injector mounted at the exit.
On the carriage itself both a thread severing system and a thread marker are provided. The thread severing system cuts the "old" thread behind the splice after the splice has been completed.
After the run or pattern change the vacuum duct is docked at the thread guides. The term run or pattern change means replacement in a spool rack or creel with new spools. The thread ends cut from the old run and lying in range of the openings of the thread guide tubes are sucked up and,
REFERENCES:
patent: 1519804 (1924-12-01), Sieber
patent: 2544435 (1951-03-01), Payne
patent: 2728132 (1955-12-01), Shattuck et al.
patent: 3714799 (1973-02-01), Minton
patent: 4287728 (1981-09-01), Schmid et al.
patent: 4564228 (1986-01-01), Kohlen
patent: 4569543 (1986-02-01), Kohlen et al.
patent: 4645248 (1987-02-01), Cottenceau et al.
Stem, W., "New Bobbin Changer", Textile Horizons, Apr. 1988.
Calvert John J.
Crowder Clifford D.
Rhone-Poulenc Viscosuisse S.A.
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