Loom with traveling shed |
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| 申请号 | US3664380D | 申请日 | 1970-05-08 | 公开(公告)号 | US3664380A | 公开(公告)日 | 1972-05-23 |
| 申请人 | WEINHEIMER GUMMIWERKE GMBH; | 发明人 | HABERHAUER KARL; HABERHAUER HERTHA; | ||||
| 摘要 | A flat or circular loom produces a flat or tubular fabric in a multiplicity of web sections each served by an individual weaving unit including a weft needle whose thread, after traversing the shedded warp threads of the associated section, is engaged by the weft thread of an adjoining needle whereby an interlinked chain of weft loops is formed to act as a filling. An intermittently operable thread clamp prevents a contraction of a loop prior to its engagement by the next weft needle and, especially in a flat loom, may also be used to draw the node between two loops into the fabric of the preceding section. In a circular loom, a loop inverter associated and synchronized with each weft needle causes the cross-links between the nodes of adjacent tiers to come to lie on the inside of the tubular fabric. | ||||||
| 权利要求 | 1. In a loom having a source of warp threads and a supply of weft threads to be interwoven therewith for producing a fabric, the improvement comprising: a plurality of substantially identical weaving units mutually juxtaposed in a direction generally transverse to said warp threads, the latter forming an array subdivided into a plurality of parallel sections each assigned to one of said weaving units, each weaving unit including shed-forming means engaging the warp threads thereof and individual insertion means for passing a weft thread through a shed formed from the associated warp threads, the insertion means of adjacent weaving units having sweeps intersecting at the boundary of their respective sheds; drive means for operating said weaving units in staggered relationship with engagement of a weft thread emerging from a preceding shed by a weft thread about to enter a succeeding shed whereby a chain of interlinked weft loops is formed across the array of warp threads; and reed means synchronized with said drive means for progressively beating said chain against the fell of the resulting fabric. 2. The improvement defined in claim 1 wherein said insertion means comprises a weft needle supported for rotation about an axis generally transverse to the array of warp threads, said weft needle having a thread-carrying tip projecting beyond the associated shed at the end of an insertion stroke and lying outside the shed at the end of a withdrawal stroke. 3. The improvement defined in claim 2 wherein said needle is curved along an arc substantially centered on said axis. 4. The improvement defined in claim 2 wherein said needle is tubular and longitudinally traversed by its weft thread. 5. The improvement defined in claim 2 wherein said axis includes a small angle with a line perpendicular to said array of warp threads. 6. The improvement defined in claim 2 wherein said needle is provided with intermittently operable thread-clamping meaNs for arresting its supply of weft threads, said thread-clamping means being synchronized with said drive means for operation upon at least partial insertion of the weft thread into the shed to prevent the contraction of a generally triangular loops formed by the weft thread. 7. The improvement defined in claim 6 wherein said thread-clamping means is operative during a terminal phase of said withdrawal stroke for drawing a node between the associated weft thread and the next-following weft thread into its own shed. 8. The improvement defined in claim 2 wherein said reed means comprises a set of battens individually engaging the warp threads of respective sections. 9. The improvement defined in claim 8 wherein said reed means further comprises a second set of battens each paired with a respective batten of the first set, the battens of each pair being provided with interleaved reeds bracketing respective warp threads between them. 10. The improvement defined in claim 9 wherein the battens of each pair are mutually offset, in a direction transversed to the warp threads, by half the width of a section. 11. The improvement defined in claim 9 wherein said interleaved reeds enter between the warp threads from opposite surfaces of the array. 12. The improvement defined in claim 2 wherein said array is tubular, further comprising a supporting tube receiving said array, said weft needles being peripherally mounted on said supporting tube and being arcuately curved about axes parallel to said tube with a radius of curvature greater than that of said tube. 13. The improvement defined in claim 12, further comprising a loop inverter juxtaposed with each weft needle for engaging its thread and displacing it in a loop along the boundary of adjoining sections for engagement by the preceding weft needle upon the emrgence thereof from the associated shed, preparatorily to entry of such weft needle into a generally triangular loop formed by the thread of said preceding weft needle, whereby lengths of weft thread interconnecting adjoining weft chains at the section boundaries are relocated to the inside of the fabric. 14. The improvement defined in claim 12 wherein said reed means comprises a shaft coaxial with said tube, a swash plate mounted on said shaft for wobbling motion, and a set of pins radiating from said swash plate into engagement with said warp threads, said shaft having an angularly offset extension driving said swash plate. 15. The improvement defined in claim 1, further comprising a set of warp dividers traversing said array at the boundaries of adjoining sections. |
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