Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1981-05-26
1983-09-27
Jaudon, Henry
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
D03D 4738
Patent
active
044063121
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a weaving machine, especially to a shuttleless loom.
TECHNICAL FIELD
The weft threads can preferably be weft threads of different colors and/or different composition, size and the like. However, the weft threads can also be of the same kind, and can be used for rendering more even the woven structure (fabric structure) by inserting them in an alternating mixture into the fabric web.
The weaving machine can preferably be a shuttleless weaving machine, i.e. a weaving machine which has no shuttles containing weft bobbins. Shuttleless weaving machines mostly insert the weft thread into the loom shed by means of grippers, projectiles, air or water nozzles or gripper shuttles which do not contain weft bobbins. Wave weaving machines are also regarded as shuttleless weaving machines because their shuttles carry no weft bobbins but are loaded with the weft thread only before the weft insertion. However, the invention may equally be used for weaving machines incorporating shuttles which carry inserted weft thread bobbins, whereby during each weft thread exchange a corresponding shuttle exchange takes place.
SIGNIFICANT STATE OF THE ART
In a known weaving machine (Dornier) with insertion of the weft threads by means of grippers the program for selecting the weft threads is programmed by punch cards. Needles read the punch cards and, by means of mechanical drives, control plates which are movable into two different positions by means of blades pivoting in accordance with the working cycle of the machine, whereby depending upon the positional combination of these plates, one of the weft threads is in its active position and the remaining weft threads are in passive positions. This positioning device is constructionally complicated, expensive, requires much maintenance and, as a consequence of the comparatively large inertia masses which are to be selected for each weft thread exchange, offers only limited possibilities for increasing its operating frequency. Other known weaving machines have selection devices which are even more expensive and have considerably larger inertia masses which have to be accelerated for each weft thread exchange.
DISCLOSURE OF THE INVENTION
It is therefore an object of the invention to provide a weaving machine to the previously mentioned type comprising a selection device which is considerably easier to build, can be manufactured at low cost, needs little maintenance and also makes possible high operating frequencies.
This object is attained, in accordance with the weaving machine, in that the program control device is constructed so as to produce electric program control signals and the positioning device is provided with at least one electromagnet responsive to program control signals from the program control device, whereby the electromagnet or the electromagnets control the positioning of the weft thread carrier or carriers and which positioning serves to transfer the weft thread from the passive position to the active position and vice-versa.
The weft thread carrier can preferably be a weft thread guide which can guide to the effective path of a weft insertion device one or more weft threads coming from weft thread bobbins, i.e. a weft thread guide which allows such weft thread or threads to be transferred from a passive position to the momentary active position. The weft thread insertion device can preferably comprise at least one gripper serving for the weft insertion, one or more projectiles, gripping shuttles or the like or the shuttles in wave weaving machines. The weft insertion can also take place pneumatically by means of compressed air nozzles or by means of water jet nozzles. There are also other ways of inserting the weft thread. In some cases the weft thread carrier can be a shuttle incorporating a weft thread bobbin. If the weft thread carrier holds the weft thread, this weft thread carrier can be, for instance, a thread clamp which, in the passive position, is closed for holding the weft thread and, in the active position of the w
REFERENCES:
patent: 3237651 (1966-03-01), Ancet et al.
patent: 3315708 (1967-04-01), Scheffel
patent: 3532135 (1970-10-01), Freihofer
patent: 3825038 (1974-07-01), Ormerod
patent: 3903930 (1975-09-01), Muller
patent: 4076054 (1978-02-01), Merisio
patent: 4132249 (1979-01-01), Camprubi
patent: 4191222 (1980-03-01), Marshall
patent: 4326566 (1982-04-01), Lampaert
Egbers Gerhard
El Helw El S.
Weinsdorfer Helmut
Aktiengesellschaft Adolf Saurer
Jaudon Henry
Kleeman Werner W.
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