Abstract:
A shedding apparatus for waste selvage includes a pair of first swing levers and a pair of second swing levers for forming an open shed of selvage yarns. The drive force to the swing levers is transmitted by cranking through a drive shaft which is coaxial with the sun gear of a planetary gear mechanism. The crank mechanism using the cranking includes a crank, first end of which is fixedly connected to the drive shaft for rotation therewith, a drive lever for transmitting a rotational force to the swing levers, and a connecting rod connected between second end of the crank and the drive lever. A ratio between an eccentric distance of the crank and a length of the drive lever is less than 1.
Abstract:
A leno device for use in weaving machines. The leno device having a first lifting shaft, a second lifting shaft and a half shaft. The shafts are connected with each other via a linkage mechanism having several transmission units Each transmission unit having a connecting bar and two guide rods. In order to prevent fingers and or the hand of the operator from being pinched between the connecting bar and one of the levers, the leno device has a separate cover part for each transmission unit. The cover part may be fastened to one of the lifting shafts or to one of the guide rods of the transmission unit, or to the connecting bar. The cover part prevents an operator from being able to reach between the connecting bar and the guide rods in warp thread direction.
Abstract:
In a method and an apparatus for producing a woven web (1) having a permanent fabric list (2) and a temporary catch selvage (3) along edges of the woven web (1), the weft thread is inserted into a main loom shed, fabric list shed, and catch selvage shed, and is then beat-up and bound-in in each shed. Both the fabric list (2) and the catch selvage (3) are formed as full rotation leno bindings, respectively by means of a first rotational leno device (12) having a first leno rotor (12A) guiding and manipulating fabric list threads (7) and a second rotational leno device (13) having a second leno rotor (13A) guiding and manipulating catch selvage threads (9). Each leno device (12, 13) may operate with or without reversal of the rotation direction. The two leno devices may be independently driven by separate rotary drives, or may be mutually driven by a common drive. The leno devices may be operated to bind-in the weft threads with the same or different binding patterns, relative to each other and relative to the main shed of warp threads. In this manner, a compact arrangement is achieved, the amount of thread needed for the catch selvage strip and for weft threads is reduced, the full advantages of the rotational leno devices can be obtained, and the loom can operate at its full speed.
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:
The invention relates to an electromotively operating device (1) for forming a leno selvedge, comprising a rotor (10) having two thread-guide eyelets (14) arranged diagonally opposite each other in the rotor (10) for the leno threads, and a stator (30) accommodating the rotor (10). The rotor (10) has a magnetic disk (16), wherein the magnetic disk (16) has a plurality of alternately positive and negative magnetized segments (17), which are oriented in an axial direction of the rotor (10).