Monolithic shed holding component for series shed weaving rotor

Details Monolithic shed holding component for series shed weaving rotor Monolithic shed holding component for series shed weaving rotor

1997-12-01

1999-09-14

Falik, Andy

Textiles: weaving

Special-type looms

Pushed shed pocket

1394356, D03D 4700, D03D 4730

Patent

active

059506857

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a monolithic shed holder element for the weaving rotor of a series shed weaving machine as well as to a weaving rotor and a weaving machine with shed holder elements in accordance with the invention.
Series shed weaving machines are multiple phase weaving machines (see e.g. EP 0 013 321) in which several weft threads displaced stepwise with respect to one another are inserted into travelling sheds, with a weaving rotor forming a plurality of sheds each of which extends over the entire cloth width. The roller-shaped weaving rotor has axially aligned blade-like combs with beat-up and guide blades. Shed holder elements are placed alternately between the guide blades and determine the upper or lower shed position of the warp threads.
Monolithic shed holder elements are known from EP 0 196 349 which each have a warp thread guidance section consisting of a passage between two projections, with the base of the passage forming the upper shed support for the warp threads. The projections have the function of the above-mentioned guide blades. The weft insertion is done by means of air jets. For individual shed holder elements a form is provided in such a manner that a space is kept free for an auxiliary blower nozzle.
These known monolithic shed holder elements are advantageously manufactured of a ceramic material as pressed parts. Instead of consisting completely of ceramics the shed holder element can for example consist of a light-weight metal, where at least the warp thread guidance section must be coated with a ceramic or other resistant material.
The auxiliary nozzle, which has an air channel as well as a suitable nozzle opening, cannot be manufactured of ceramic material or can only be manufactured of ceramic material with great cost and effort. In contrast to the case of the shed holder elements, the possibility exists of constructing the auxiliary nozzles economically of plastic. Due to rapid wear by the warp threads, plastic cannot be used for the shed holder elements.


SUMMARY OF THE INVENTION

The invention is based on the object of providing shed holder elements which can be manufactured economically. A reduction in costs results from the fact that the auxiliary nozzle is integrated into the shed holder element and need not be constructed as a separate element. A corresponding embodiment of the shed holder element using ceramic material would be very expensive, since the bores necessary for the nozzle could only be made at a high cost.
A further advantage of the integrated nozzle is that there is no problematical place of transition between the nozzle and the weft thread channel of the shed holder element. The weft thread executes an oscillatory movement swinging back and forth over the entire cross-section of the weft thread channel during the insertion. In order that the thread, so far as is possible, suffers no damage on contacts with the shed holder elements, the contour of the channel must be executed in a thread-friendly manner. Fibers of the weft thread can catch at a gap in the transition region between the nozzle and the weft thread channel. Such a problematic place would thus not be thread-friendly. The elimination of such a transition region can be considered to be a further object of the invention.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1a shows the upper part of a shed holder element in accordance with the invention,
FIG. 1b is a side view of the exemplary embodiment of FIG. 1a,
FIG. 2 shows the upper part of a shed holder element in accordance with a second embodiment,
FIG. 3a is a side view of a third embodiment,
FIG. 3b is a view of the third embodiment in the direction of the warp thread,
FIG. 4 is a side view of a fourth embodiment,
FIG. 5a is a side view of a fifth embodiment,
FIG. 5b is a cross-section through the shed holder element of FIG. 5a along the line B--B,
FIG. 6 is a section of a weaving rotor viewed in the direction of the axis,
FIG. 7 shows a shed holder element in "half-tooth execution" and
FIG. 8 is a section thr

REFERENCES:
patent: 4290458 (1981-09-01), Steiner
patent: 4314590 (1982-02-01), Suzuki et al.
patent: 4442871 (1984-04-01), Suzuki et al.
patent: 4492255 (1985-01-01), Steiner
patent: 4586541 (1986-05-01), Steiner
patent: 4655259 (1987-04-01), Steiner

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