Textiles: manufacturing – Warp preparing or handling – Machine replenishing
Patent
1995-12-14
1997-07-22
Calvert, John J.
Textiles: manufacturing
Warp preparing or handling
Machine replenishing
D03J 114
Patent
active
056493444
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
A. Field of the Invention
The invention concerns a method for drawing new warp threads from a warp beam into and through a warp stop motion and/or a shed-forming device of a weaving machine or loom, wherein the beginnings of the new warp threads are connected by thread connections with the ends of the warp threads already in the warp stop motion and/or shed-forming device and then are pulled through apertures of elements of the warp stop motion and/or shed-forming device, and further concerns apparatus with which to carry out said method.
B. Related Art
It is known to sever old warp-beam warp threads located in the warp stop motion, the shed-forming device and the reed and to link them to the beginnings of the warp threads of a new warp beam. This linking may be in the form of knotting or splicing. Following such linking, the new warp threads are drawn-in by the old warp threads, the thread linkages by the threads themselves are pulled through the apertures of the warp stop motion drop wires and through apertures of heddles of the harnesses and through the reed. This drawing-in or advancement of the linked warp threads is delicate. If a knot or the like catches on one of the mentioned apertures, warp threads may rupture. It is known that it is easier to draw-in the thread-linked warp threads if they are beaten or if they are made to vibrate in some other way.
The object of the invention is to facilitate the drawing-in procedure and to reduce the danger of thread rupture thereby.
BRIEF SUMMARY OF THE INVENTION
This problem is solved by configuring the elements of warp stop motion and/or shed-forming device and/or by guiding the warp threads, so that the warp threads including the thread-linkages enter the apertures through which they are being pulled at an angle less than 90.degree..
Experiment has shown that by drawing and pulling the warp threads into and through the apertures during an oblique manner, the danger of warp thread rupture is reduced in such introduction, and that at the same time the rate of drawing-in can be raised.
In a further variation of the invention means are provided, in an apparatus for implementing the method of the invention, to mount the elements of a warp stop motion and/or a shed-forming device obliquely to the direction of warp advance. In another embodiment, guides are provided in front of or after the elements of a warp stop motion and/or a shed-forming device to align the direction of warp advance relative to the elements.
Further features and advantages of the invention are stated and elucidated in the following description of the illustrative embodiment shown in the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 schematically shows apparatus with which to carry out the method of the invention,
FIG. 2 is an enlarged cutaway of the section denoted by F2 in FIG. 1,
FIG. 3 is an enlarged cutaway denoted by F3 in FIG. 2,
FIG. 4 is a variation of the embodiment of FIG. 2,
FIG. 5 is an embodiment comprising harnesses of a shed-forming device which are height-offset relative to the warp direction of advance,
FIG. 6 is an enlarged cutaway of the section denoted by F6 in FIG. 1, and
FIG. 7 is a variation of the embodiment of FIG. 6.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT(S)
The apparatus 1 shown in FIG. 1 comprises a weaving machine or loom portion 2 with a warp stop motion 3, a warp beam 5 resting on a shaft 4 and a whip roll 6. This loom portion 2 is mounted to a frame 7 comprising a housing 8 for the harnesses 9 of a pack of harnesses 9 and a housing 11 for a reed 12. Moreover this frame 7 comprises a warp draw-in device 13. The housing 8 is fitted with a lower receiving means for the harnesses 9 and an upper rest 10, as a result of which the harnesses 9 are spaced along the warp thread advance direction, slant at an angle of about 45.degree. and are mutually offset heightwise (the direction extending away from the imaginary line or plane 23 to be more fully described below).
Warp threads 14 from the new and full warp beam 5 run ov
REFERENCES:
patent: 3072999 (1963-01-01), Cook et al.
patent: 3348282 (1967-10-01), Baumgarten et al.
Calvert John J.
Picanol N.V.
LandOfFree
Process and device for drawing in new warp threads does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and device for drawing in new warp threads, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and device for drawing in new warp threads will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1553419