Projectile loom refers to a loom that uses a sheet-like […]
Projectile loom refers to a loom that uses a sheet-like weft clamp (also called a "projectile") to introduce the weft into the shed. High weft insertion speed, strong adaptability to fabric varieties, can weave wide fabrics, and low machine noise.
The projectile loom has a high weft insertion speed and a strong adaptability to fabric varieties. It can weave broad fabrics with low machine noise. There are two series of projectile looms: PU and PS. The working width is 220～545 cm. It is divided into single color and multicolor. It can weave pure and blended fabrics such as cotton, wool and chemical fiber. Such as the installation of dobby and jacquard shedding mechanism, we can weave small and large pattern fabrics. In 1933, German R. Rothman first proposed the projectile weft insertion; in 1934, the Swiss Sulzer Company developed the projectile loom, which was put into commercial production in the early 1950s. Projectile looms are different from general shuttle looms in three parts: weft insertion, beating-up and selvedge. The weft insertion is composed of a shuttle box, a torsion shaft picking mechanism, a shuttle guide rail, a shuttle box and a projectile transfer mechanism. Each loom is equipped with several projectiles, and the weft yarns are introduced into the shed from the weft feeding side of the loom in sequence. The power of the shuttle comes from the elastic potential energy stored when the torsion shaft is twisted, and the remaining energy is absorbed by the hydraulic buffer.
The projectile moves along the guide rail. After it enters the shuttle box and is braked, it is sent back to the original place by the transmission mechanism under the shed. The beating-up adopts a conjugate cam mechanism. When the sley advances, the shuttle guide rail exits the shed and moves to the bottom of the cloth surface to complete the beating-up action; when the sley moves back and rests, the shuttle guide rail is inserted into the shed, and the projectile moves forward along the shuttle guide rail to introduce the weft into the shed. The folding, twisting and intermediate selvedge devices are used on the projectile loom to weave single-width, double-width or multiple-width fabrics. When weaving synthetic fiber fabrics, an edge melting device is used to fix the edge warp yarns. Since the 1970s, projectile looms have widely adopted weft accumulators, electronic detection of loom stoppages and other devices to improve the productivity of the loom; at the same time, they have also successfully tested the use of mechanical, pneumatic or linear induction motors to project one or both ends of the weft. Projectile loom with only projectile and reciprocating weft insertion.