Textiles: weaving – Stopping – Warp
Patent
1988-03-18
1989-06-13
Jaudon, Henry S.
Textiles: weaving
Stopping
Warp
139353, D03D 5130
Patent
active
048383201
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a contact bar for an electrical warp stop motion suitable for a textile machine comprising two electrically conductive carriers arranged parallel and electrically insulated from each other. The two carriers forming the contact bar extend as one unit through the contact slots of numerous drop wires which are carried by the warp ends. If a warp end should break, the associated drop wire will drop on the contact bar and complete an electrical circuit between the two carriers, resulting in stopping of the weaving machine. Such a device of monitoring warp ends is known as electrical warp stop motion.
Most contact bars of warp stop motions in use today caomprise an inner and an outer bar. The upper edge of the inner bar is mostly configured with rectangularly shaped cut-outs which is called serration or toothing. At a breakage of a warp end, the associated drop wire drops and will be caught in one of said cut-outs. By means of a lever which is connected to the warp stop motion and also to the contact bars, the complete bars or only the inner bars can be reciprocated. This lateral movement of the contact bar with the caught drop wire in one of the cut-outs causes that the drop wires which are adjacent to the dropped drop wire are reciprocated slightly, which ultimately facilitates the location of the broken warp end.
The trend and technical development indicate clearly that weaving machines are becoming wider which subsequently necessitates longer warp stop motions. It is quite a common fact that warp stop motions now in use may have lengths of several meters. The corresponding contact bars do obviously have the same length. One warp stop motion can be equipped with several contacts bars arranged at a certain distance, the pitch, from each other and which are parallel to each other, extending across the complete length of the warp stop motion. On each of these contact bars numerous drop wires are lined up, there might be more than thousand drop wires per one contact bar, depending on the width of the weaving machine. Each drop wire is carried by an associated warp end. With increasing width of the fabrics, it becomes for the operator of a weaving machine more and more difficult and time-consuming to locate amongst several thousands of drop wires the one which dropped and rests on the contact bar. With the warp stop motions nowadays in use the location of a dropped drop wire takes place by reciprocating the contact bars which results that the drop wires which are carried by the undamaged warp ends, and are adjacent to the dropped drop wire are forming a gap, thus the broken end can be found.
The principal object of the present invention is to provide a contact bar for a warp stop motion on which it is possible to locate a dropped drop wire even on long contact bars quickly and without difficult searching operation, with the object in mind that the idle time of the weaving machine is reduced and consequently the efficiency will increase. A further principal object is to monitor the performance of weaving machines in regard to breakages of the warp ends in that the frequency and the location of warp end breakages will be registered and stored in data memories which may be evaluated in a coordinating center and may be used for various purposes.
A rather exact location of the broken warp end and the associated dropped drop wire respectively can be achieved by determining electronically the distance between the dropped drop wire and either one of the ends of the contact bar. It is known that according to the principle of the electric resistance bridge an interruption or a short circuit of current can be localized in a pair of electrical conductors. A solid bar, however, as in the present case the inner bar of the contact bar, is not suited for the purpose of scanning resistances by way of using the principle of electric resistance bridge. It is, therefore, essential to use an inner contact bar which has a substantially higher electrical, with the length linearly increasing, resistance. A thin w
REFERENCES:
patent: 3246091 (1966-04-01), Koch
patent: 3324899 (1967-06-01), Stagg
patent: 3725911 (1973-04-01), Cook et al.
Grob & Co. Aktiengesellschaft
Jaudon Henry S.
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