US2267578A - Production of warp fabric - Google Patents

Description

Dec. 23, 1941. P, SCHC SNFELD PRODUCTION OF WARP FABRIC Filed Oct. 9, 1940 Jgremar: P401. sc x/oxvrzo or/zeys Patented Dec. 23, 1941 Application 0mm 9,1940, Serial No. 360,371

In ,Germany July 10, 1939 v 2 Claims. This invention relates to a method of producing a transversely ribbed warp fabric, wholly or I partly provided with underlaid rubber warp threads, on a warp loom having only one row of needles, in which the lapping machine for the rubber threa-dstis always racked in the-same direction as the lapping machine for the ground thread.

It is known to produce transversely ribbed warp goods wholly or partly provided with underlaid rubber warp threads on warp looms having only one row of needles, in which the rubber threads serve the double function of imparting rubberlike elasticity to the textile'base and of forming the transverse ribs. According to an older proposal relating hereto the rubber thread machine is alternately racked in. the same direction as the ground thread machine and then again in a direction opposite thereto, whereas in accordance with a more recent proposal the rubber thread machine is racked always in the same direction as the ground thread machine. The purpose of the second proposal is to avoid the alternate opthreads, when placed around the needles at certainpoints only, will notform proper meshes.

This difiiculty is eliminated according to the invention by placing the rubber threads around the needles in spots where each of them forms a single mesh in such manner that they are introduced at these points in their racking direction into the courses concerned at least one needle ahead of the needles which work them into meshes and that they are lapped from .this point of introduction up to the needles producing the rubber mesh in the form of an underlaying operation.

In this way, the ru ber threads prior to their mesh-forming displacement are held by the needles positioned in the racking direction of the rubber thread machine in front of the needles eration of the rubber thread machineand thereby to obviate the well-known drawbacks connected with this racking method. To insure interweaving of the rubber threads in the ground fabric lapped by the lower machine in the second method, the rubber thread machine carries out underlaying, operations at the points con cerned, which are greater or smaller than those of the ground thread machine. formed by omitting lateral racking of the rubber threads between the points mentioned or by causing the rubber threads to carry out underlaying operations of a size equal to that of the underlaying operations performed by the ground threads, sothat the rubber threads are freely exposed at these points on one or the other side of. the goods and can unrestrainedly contract and thereby simultaneously effect contraction of the fabric at these points, which automatically leads to the formation of ribs.

The known method outlined above is, howiabric produced in conformity therewith therubber warp threads are not secured against running back, and it is the objector the invention to overcomethis drawback.

This object could be attained merely by placing' the rubber warp threads around the needles in spots, so that each of the threads would form there a single mesh, butthis procedure is notnpracticable tor the reason that the rubber The ribs are' ever, open to the serious objection that in a which work the threads into meshes, andas all necessary requirements for the loopin of the rubber threads are complied with. from the start, further correct working of the rubber threads to form proper meshes is insured.

The invention is illustrated by way of example in the accompanying drawing showing a lapping diagram.

The groundfabric threads I are gathered in known manner in the lower lappingmachine carrying outunderlaying operations under two needles. .According to the drawing, this machine laps a plain cord, and the threads are worked under 2 over I and back. The rubber warp threads 2 are gathered in the upper ma chine which, however, does not merely carry out underlaying operations but arranges, in,

places, the rubber threads 2 around the needles, which at these points each form a single mesh. The mesh-forming lapping of the rubber threads 2 occurs in the courses 3. For the purpose of forming ribs the rubber threads are not subjected to lateral racking in spots, for instance in the courses 4. In the courses 3 where the rubber threads surround the needles for looping, they are laterally racked in the same direction as thethreads I, and the rubber, thread group .laps therefore always with the ground thread group. I

vA further feature of the invention is that the rubber threads 2 during mesh-forrm'ng lapping in the courses 3 are always introduced in, their racking direction at least one'needle ahead of the needles which work them into meshes and that they are lapped from this point of introduction in the courses 3 in the form of underinthesround The invention maybe applied of course also to the'mcthcd according to whichriha are formed underlaylng operations of exactly the same ex tentasthesroundthreadbut'alsobwomitflnz alternaterackingottherubberthreadnandflmhaving 'them carry out an underlain openflon equalinsizetothatoi'thegroundthreads.

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