Method and weaving loom for producing a leno ground fabric

Abstract

A leno ground fabric is produced over the entire weaving width of a loom by using two heald frames each having a length corresponding to the weaving width. The heald frames are equipped with a multitude of lifting healds or heddles and with a multitude of half healds or heddles that move the leno warp thread and the ground warp threads for the shed formation over the entire loom width.

Description

[0001] This application is based on and claims the priority under 35 U.S.C. .sctn.119 of German Patent Application 100 04 376.3-26, filed on Feb. 2, 2000, the entire disclosure of which is incorporated herein by reference.[0002] The invention relates to producing a leno ground fabric on a weaving loom modified for that purpose.BACKGROUND INFORMATION[0003] European Patent Publication EP 0,534,629 B1 describes a weaving loom with a first heald frame and a second heald frame. Each heald frame is vertically shiftable or displaceable in shaft guides of the weaving loom. At least one of the heald frames holds a subframe carrying heald shafts or heddles. The subframe is movable back and forth, for example in the first heald frame, in the weft insertion direction. For performing the back and forth motion the subframe is slidably mounted with an axle or support bar extending in the weft insertion direction and slidably mounted on supports of the respective heald frame that holds the subframe...

AI Technical Summary

Benefits of technology

0018] The individual sensors are connected with their respective output through respective electrical conductors to a central loom control unit or CPU 16 which has stored in its memory 16' rated warp tension signal values. A comparator 16" compares the measured warp tension signal values with the stored rated warp tension signal values to provide a respective control signal if there is a deviation between the measured and the rated warp tension. The resulting control signals, if there is a deviation, are processed and supplied to the drive of the respective warp beam to provide a closed loop control for the leno warp thread and separately for the ground warp thread withdrawal to maintain the desired warp tension.

0019] It is also possible to measure the warp tension indirectly so that instead of the above described warp tension sensing or additionally thereto, at least one fabric tension sensor may be arranged in the area of the finished fabric between the beat-up line of the fabric and a fabric detouring device. The fabric tension sensor measures the tension in the fabric and thus indirectly the tension in the warp threads. The output of this indirectly measuring fabric tension sensor is also supplied to the central loom control to provide a closed loop control signal if deviations between the rated and actual warp thread tensions are discovered.

Problems solved by technology

The known loom requires a substantial effort and expense for producing a leno fabric because in addition to the conventional oscillating vertical motion sequence of the at least two heddle frames, a motion sequence extending crosswise to the normal vertical motion for moving the subframe in the weft insertion direction is required.

This type of loom also requires a relatively high effort and expense for the construction and driving elements of the three heald frames.

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