Abstract:
The device for detecting breakage of leno threads in leno selvedge devices on looms, the leno selvedge forming device being provided with at least two arms for guiding at least two leno threads, the leno threads being twistable together by virtue of the rotation of the arms, the device (12, 13, 14, 14a) for detecting thread breakage being provided with a facility (13, 14) for determining the natural oscillations of the arms (12) and a loom, more specifically with heald frames, with at least one leno device which is reversible in its direction of rotation and with a facility for detecting breakage of the leno threads, the device for detecting thread breakage being arranged in the front shed (V), more specifically between the leno device (10) and the heald frames (20).
Abstract:
The apparatus (1) for the preparation of at least two leno warp threads (6a, 7a) for a weaving machine (13; 17) comprises a first holder apparatus (7b) for the reception of a first leno thread bobbin (7) as well as a second holder apparatus (6b) for the reception of a second leno thread bobbin (6) as well as a rotatably journalled thread guide apparatus (3) which supplies the leno warp threads (6a, 7a) to a weaving machine (13; 17) which is placed after it in the direction of thread travel (F), with the first holder apparatus (7b) being arranged first in the direction of thread travel (F), being followed by the second holder apparatus (6b), and being then followed by the thread guide apparatus (3), and with a thread guide element (2m) for the guiding of the first leno warp thread (7a), which is to be drawn off from the first warp thread bobbin (7), being arranged substantially in the direction of thread travel (F) and extending adjacent to the second holder apparatus (6b), with the thread guide element (2m) having an entry opening (2z) for the first leno warp thread (7a) which is arranged ahead of the second holder apparatus (6b) in the direction of thread travel (F), and with the thread guide element (2m) being designed to extend in such a manner and is rotatable through 360° and drivably journalled about an axis of rotation which extends substantially in the direction of thread travel (F) in such a manner that the second warp thread bobbin (6), which is arrangeable on the second holder apparatus (6b), can be circled by the thread guide element (2m) in order to twist the first leno warp thread (6a), which emerges from the thread guide element (2m), together with the second leno warp thread (7a), which extends between the second warp thread bobbin (6) and the thread guide apparatus (3).
Abstract:
First and second threads, the tensions of which must be equalized, are fed to their place of processing from respective first and second storage bobbins provided with braking discs over rotating rollers situated on a bridge capable of oscillation. The increased pull of the first thread in case of an increased tension therein causes the bridge to be displaced, whereby a larger braking force is generated for taking off the second thread from its respective bobbin, and the braking force for the first bobbin is reduced.
Abstract:
A leno thread tensioner (26, 26A, 26B) is positioned upstream, as viewed in the movement direction of the leno threads (9, 10), of a leno selvage former (1) for tensioning the leno threads especially during change-over of the leno thread. Additionally, or instead, a leno thread spreader (23) and detour member is positioned downstream of the leno selvage former for preventing intertwining of the leno threads before they are bound into the leno selvage.
Abstract:
The present invention provides a selvage-forming device for use in a weaving apparatus, which selvage-forming device is of a relatively simple construction and yet effectively forms the selvage. The device comprises a rotatable plate upon which is mounted first and second supplies of thread. The thread from each supply of the same is preferably fed to a pre-guide member, through a guide means at the extremity of a tensioning arm, and through an aperture in the rotatable plate. The rotatable motion of the plate will cause the selvage threads to form the desired selvage.
Abstract:
The working means for reinforcing the borders of a fabric by a leno weave are situated close to the binding place in the internal space of shafts of healds. This reduces the requirement for compensation of differences of tension of the binding threads, the requirement for floor space, and also the mass of the operating mechanism.
Abstract:
A device for manufacturing a fabric has a plurality of automatically working apparatus arranged next to one another on at least one carrier for manufacturing a leno weave (a leno weave apparatus). Two leno threads are fed to each leno weave apparatus. The device has at least one weft thread picking device; wherein the weft thread is introduced into the shed of leno threads raised by a plurality of leno weave apparatus. The weft thread is bound using at least two leno threads at a plurality of points behind the weft thread over the width of the fabric. At least one of the leno weave apparatus arranged in the end region of the fabric carries out a higher number of interlacings for achieving a homogenized warp tension distribution over the width of the fabric; and/or the lowering of the shed is carried out by the leno weave apparatus over the width of the fabric at different times for achieving a homogenized warp tension distribution.
Abstract:
The subject of the invention is a device for manufacturing a fabric comprising a plurality of automatically working apparatus arranged next to one another on at least one carrier for manufacturing a leno weave (a leno weave apparatus), wherein two leno threads are fed to each leno weave apparatus; wherein the device for manufacturing the fabric has at least one weft thread picking device; wherein the weft thread is introduced into the shed of leno threads raised by a plurality of leno weave apparatus; wherein the weft thread is bound using at least two leno threads at a plurality of points behind the weft thread over the width of the fabric; wherein at least one of the leno weave apparatus arranged in the end region of the fabric carries out a higher number of interlacings for achieving a homogenized warp tension distribution over the width of the fabric than at least one leno weave apparatus arranged in the central region of the fabric; and/or wherein the lowering of the shed is carried out by the leno weave apparatus over the width of the fabric at different times for achieving a homogenized warp tension distribution.