Textiles: weaving – Warp manipulation – Traversing
Patent
1987-01-20
1987-12-29
Jaudon, Henry S.
Textiles: weaving
Warp manipulation
Traversing
D03D 4740
Patent
active
047154080
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a gauze or leno harness for weaving machines.
Heretofore, various types of gauze or leno harnesses have been known for weaving machines. Generally, such a harness includes a stationary frame-like carrier having a central web which separates two lanes or slots and a connecting passage which connects the lanes. The carrier is positioned so that a crossing yarn may move from one lane to the other during a shed-changing operation of the weaving machine. In addition, such a harness is usually provided with a guide for a standing yarn which is reciprocated between the two lanes counter to the shed-changing operation. In order to guide the carrier yarn between the lanes, a guide element is provided near the connecting passage in order to guide the crossing yarn during the between-lane movement. During a shed change, the crossing yarn can be caused to cross over the stationary yarn each time that the crossing yarn passes from one lane to the other of the carrier. Such a harness is described in European Patent Application No. 84105316.8; however, such a harness suffers from the disadvantage of taking up relatively considerable width in relation in the warp yarn compacting width. Also, the element which guides the crossing yarn and which is in the form of a switch or a spoked wheel tends to become sluggish because of dirt.
Briefly, the invention provides a leno harness for a weaving machine which is comprised of a frame-like carrier, a guide and a guide element.
The frame-like carrier includes a central web, a pair of lanes on opposite sides of the web for guiding a crossing yarn therein and a passage having an inclined base connecting the lanes with each other for guiding the crossing yarn therebetween
The guide is of generally known construction for a standing yarn and is mounted centrally of the lanes of the carrier for reciprocating movement relative to the central web of the carrier during a shed change.
The guide element includes a pair of arms which extend about the web of the carrier with a clearance at least equal to the thickness of the crossing yarn and with each arm disposed in a respective lane. In addition, the guide element has a yoke which interconnects the arms and which rests on the inclined base of the carrier.
In one embodiment, the carrier is constructed so that each lane has a widening extending over the length of a respective arm of the guide element. This facilitates passage of a crossing yarn by the inside and outside surfaces of each arm of the guide element as the case may be.
In another embodiment, the guide element is a one-piece U-shaped element. In this embodiment, the guide element includes a pair of grooves on opposite sides which slidably receive the carrier. In this respect, the guide element is thicker than the carrier.
In another embodiment, the guide element is in the form of a spring wire and the carrier includes grooves receiving at least two ends of the arms of the spring wire.
In still another embodiment, the guide element is in the form of a spring strip which is of a width equal to the thickness of the carrier and which has a pair of thickened edges. Alternatively, the spring strip may be held in place by being supported on a plurality of pins on the carrier.
Embodiments of the subject of the invention will be described hereinafter with reference to the drawings wherein:
FIG. 1 is a perspective view of a gauze or leno harness according to the invention;
FIGS. 2a-2c show the guide or deflecting element of the harness in various movement phases;
FIG. 3 shows some of a fabric having a gauze edge;
FIG. 4 shows a double gauze or leno harness;
FIG. 5 is a cross-section on the line V--V of FIG. 4;
FIG. 6 shows some of a fabric with an edge for cutting;
FIG. 7 shows another embodiment of a gauze or leno harness;
FIG. 8 is a cross-section on the line VIII--VIII of FIG. 7;
FIG. 9 shows another embodiment of a guide element or deflecting element;
FIG. 10 shows another embodiment of a gauze or leno harness, and
FIG. 11 is a view in side elevation looking in th
REFERENCES:
patent: 4066105 (1978-01-01), Heinrich et al.
patent: 4589450 (1986-05-01), Eisenlohr
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