Textiles: manufacturing – Warp preparing or handling – Machine replenishing
Patent
1993-12-15
1995-07-11
Falik, Andrew M.
Textiles: manufacturing
Warp preparing or handling
Machine replenishing
139 1R, D03J 100, D03J 118
Patent
active
054309166
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention involves effecting a warp change on weaving machines by the tying of a new warp to the old woven-out warp, the old warp being pulled on its last piece through the harness over a length of approximately 1.5 to 2 m and wound up in order to eliminate cross-overs of the warp yarns and to loosen warp yarns stuck together with size. The old warp is therefore prepared in such a way that the quality of the tying operation is influenced positively and, in particular, knotting can be carried out with straight yarns. When a new warp is being tied, this piece previously pulled forwards is then pulled back again and weaving takes place in a completely normal way after the machine has been started.
BACKGROUND OF THE INVENTION
A parameter which is very important in weaving and which essentially determines profitability is the performance of a machine, a machine group or an entire weaving mill. The machine manufacturers have always made efforts to increase the performance, but these have hitherto, in practice, been restricted only to the avoidance, reliable detection and rapid elimination of machine stoppages. Only very recently has it been acknowledged that the article change and warp change have a relatively high potential for rationalization which can be utilized to increase the performance. Two directions of endeavored are appropriate for this, on the one hand substantial automation and on the other hand such a high degree of simplification that these operations can be carried out by a single person.
The present invention comes within the latter sector and relates to a method and an apparatus for the simplified warp change on weaving machines, on which the end portion of a warp is pulled forwards over a specific length, in which method the warp yarns of the woven-out warp are fixed and cut off by a rail-like member and the warp yarns of the new warp are clamped on a tie-in frame which has clamping members and which is transported to the weaving machine, on which the warp-yarn layer of the woven-out warp is inserted into the clamping members.
These operations are known and have been practiced for a long time, for example in the tying of warps by means of the tying-in machine USTER TOPMATIC (USTER being a registered trademark of Zellweger Uster AG), but this concerns the traditional warp change which is not automated and which, in practice, is usually carried out by several persons. With regard to an automation of the warp change, two proposals have recently been made, these having so-called one-sided clamping rails (Swiss Patent Applications No. 1193/91 and 2741/91) which can be inserted behind the warp-yarn regulator after the old warp has been pulled forwards. After the warp yarns have been clamped, they are cut off just behind the one-sided clamping rail and the clamping rail is then pulled back towards the tying-in frame. This operation requires a driving and control mechanism which involves a relatively high outlay and which is itself relatively expensive.
SUMMARY OF THE INVENTION
A method for allowing a one-man warp change and an apparatus for carrying out this method are now provided as a result of the invention.
The method according to the invention is characterized in that the warp-yarn layer of the woven-out warp is fixed on a roller assigned to the clamping members and is pulled back out of the weaving machine over the said specific length as a result of the rotation of this roller.
The apparatus according to the invention for carrying out this method, with a tying-in frame having clamping members for two yarn layers, includes a rotatable winding roller arranged parallel to the clamping members and having fixing means for the warp yarns, and by a carrier unit for the said winding roller and for the tying-in frame, the said carrier unit preferably being provided for mounting on a warp-beam transport unit.
BRIEF DESCRIPTION OF THE DRAWING FIGURES
The invention is explained in more detail below by means of an exemplary embodiment illustrated in the drawings; in the
REFERENCES:
patent: 3386144 (1968-06-01), Altenweger
patent: 3423808 (1969-01-01), Altenweger
patent: 3696477 (1972-10-01), Townsend
patent: 3908249 (1975-09-01), Altenweger
patent: 3974551 (1976-08-01), Baer et al.
patent: 5297323 (1994-03-01), Jaeggi
Furrer Reinhard
Plaschy Martin
Falik Andrew M.
Zellweger Luwa AG
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