Water Jet Weaving Machines

fabric weaving Water Jet machines are extensively used in East Asia. They are characterized in particular by high insertion performance and low energy consumption. These machines are produced only by few companies and are used for the manufacture of light and medium weight fabrics with standard characteristics and in water repellent fibre materials, primarily multi-filament synthetic yarns. They are characterized in particular by high insertion performance and low energy consumption.

Special Weaving Machines

fabric weaving Weaving machines used for manufacturing terry fabrics, double velvets and narrow fabrics are categorized in special weaving machines. Some of the examples of such machines are terry weaving machines, double velvet weaving machines, ribbon weaving machines etc.

Bearing Structure of a Weaving Machine

fabric weaving The weaving machines are composed of two side frames in cast iron or steel, which are connected each other by cross members so as to create a firm bearing structure which can limit the vibrations and offer a good stability.

Warp let-off and fabric take-up

fabric weaving Warp let-off system has a frequency converter, which is intended for letting off from warp beam or feeding unit. The drive is mounted either on the weaving machine or on a frame positioned behind the weaving machine. The let-off starts with a machine running signal; the speed of the let-off motor is controlled by a proximity switch mounted on the whip roller system and an internal speed memory. An alarm signal switches the weaving machine off in case of over tightened warp or any other error.

Shedding machines

fabric weaving The angle which is formed by the raising threads with the threads remaining in low position is called shed. The shed must be as wide open as to permit the easy passage of the weft insertion element. The shed can be obtained by either moving the heald frames or by directly moving the heald frames through. The machines used to form the shed are cam machines, dobbies and Jacquard machines.

Drive and control of weaving machines

fabric weaving The latest weaving machines are equipped with microprocessor or PLC units which ensure continuously the control, the drive and the monitoring of the various machine members and of the various functions. One of the ways to increase production is to design and manufacture particular weaving machines which can offer very high weft insertion rates.

Weaving Equipments

fabric weaving Special equipments to improve efficiency and accuracy of weaving machines, reducing manual work are required. With a view to increase the efficiency and the flexibility of the weaving machines, the manufacturers have made considerable efforts to find solutions capable of simplifying and speeding up the operations and the machine settings at style changing and to permit coping better with particular production requirements.

Weft feeders

fabric weaving Weft feeders are feeding devices, which are also called weft storage feeders or weft accumulators, play an important role in the weaving machines where the weft is unwound overhead from the cone and is subjected to abrupt accelerations due to the drawing-off tension exerted by the insertion element. The balloon which is formed at each insertion can cause coil sliding and snarls, owing to the difficulty of braking adequately the yarn and to the high unwinding speed of the yarn from the cone.

Weft and warp control

fabric weaving The weft stop motion controls the correct insertion of the weft into the shed. Warp and weft stop motions will stop the loom most immediately when a warp end or a pick breaks off. It avoids the faults disturbing the fabric surface. It helps not degrading the fabric quality. The feeders are supplied together with various outfits and adjustment possibilities, which vary according to the yarn type and count and to the insertion system used.

Selvedge

apparel-making fabric weaving Selvedge are special hooked needle driven by a cam which produces, after cutting, the insertion of the protruding thread end into the subsequent shed, thus forming a stronger edge. The basic function of any selvedge is to lock the outside warp threads of a piece of cloth and so prevent fraying. The selvedge should be strong enough to withstand the strains of the stenter in the finishing process. - The selvedge should have a neat and uniform appearance.