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Warp Knitting Machine Working Principle
- Nov 09, 2018 -

The warp knitting machine is mainly composed of a weaving mechanism, a bar traverse mechanism, a let-off mechanism, a pulling take-up mechanism and a transmission mechanism.

1 The knitting mechanism comprises a needle bed, a bar, a sinker bed and a pressure plate, which are generally driven by a cam or an eccentric link. Cams are often used in warp knitting machines with lower speeds and more complex motion laws. The eccentric connecting rod is widely used in high-speed warp knitting machines because of its smooth transmission, simple processing, and low wear and noise during high-speed operation.

2 The bar traverse mechanism causes the bar to traverse in accordance with the requirements of the knitted fabric during the loop forming process, and the warp yarn is placed on the needle to be woven into a knitted fabric having a certain structure. There are usually two types of flower plate type and cam type. The flower plate type mechanism is connected to the flower plate chain by the flower plate of a certain shape and size according to the requirements of the knitted fabric, so that the bar is traversed, and is suitable for the structure of the weaving pattern, and the flower pattern change is convenient. In the cam type mechanism, the cam is designed according to the required traverse rule of the knitted fabric, and the transmission is relatively stable, and can adapt to a higher knitting speed.

3 The delivery mechanism retracts the warp yarns on the warp beam and feeds them into the weaving area. There are two types of negative and positive. In the passive mechanism, the warp beam is pulled by the warp tension and the warp yarn is sent out. It does not need a special warp beam transmission device, and is suitable for warp knitting machines with lower machine speed and more complicated delivery rules. The active type of warp-passing mechanism uses a special transmission device to send the warp beam to the warp yarn, and has the tension-sensing type and the line-speed sensing type. The tension sensing mechanism controls the warp speed by the tension bar sensing the warp tension. The linear speed sensing mechanism controls the speed of the warp beam by sensing the speed of the warp movement speed by the speed measuring device. This type of mechanism delivers warp yarns at a predetermined line speed and can work stably under high-speed operation conditions, so it is widely used in high-speed warp knitting machines.

4 The pulling and unwinding mechanism functions to draw the fabric from the woven area at a predetermined speed and wind it into a cloth roll.