Tappets are used for simple weaves in which the number of shafts is limited. Dobby systems involve the use of a pattern chain to control the lifting of the shafts. They are the most commonly used for wool. Jacquard systems control the lifting of each individual end to create almost unlimited patterning possibilities. (Wool Web, 2007)
In the simplest type of tappet shedding motion, the shedding cams are mounted on the bottom shaft, and the motion is suitable only for weaves repeating on two picks. By mounting the tappets on a counter shaft driven by gearing from the bottom shaft at the appropriate speed, the repeat can be extended up to eight or ten picks. Bobbies are much more versatile and usually control at least sixteen, and sometimes as many as 36, head shafts. Since the lifting of the shafts is controlled by some form of pattern chain, there is virtually no limit to the number of picks per repeat. Jacquard machines are made in a wide variety of sizes to control from 100 to 2000 or more ends per repeat. A common size controls 600 ends, which, in a cloth with 30 ends/cm, gives a repeat 20 cm wide within which the designer has complete freedom. The lifting of the ends is controlled by a chain of punched cards or by a loop of punched paper (Ministry of Science and Technology, 2006).
from high-fashion woollens to heavy technical textiles. ...
With the yarn friendly, reed-controlled terry equipment a maximum loose pick distance of 24 mm and thus pile heights of over 11 mm are possible. Rapier has special weft brake which decelerates the weft perfectly to the exact length, thus reducing weft waste to a minimum.
A projectile weaving machine with a working width of 390 cm, equipped for denim production, weave a denim fabric in two panels, with a weft insertion rate of over 1500 m/min and special yarn waste reduction. The projectile weaving machine's versatility is proved by the wide range of fabrics it produces. The projectile weft insertion system can be used with all types of yarn, from spun yarns made of cotton, wool, man-made fibres and blends thereof, filament yarns, tapes and monofils for simple standard fabrics, to sophisticated, state-of-the-art technical textiles. A particular strength of the projectile weaving machine is the production of broad fabrics, with working widths up to 6.5 metres. This gives unbeatable advantages in the production of technical textiles, agrotextiles and geotextiles. Given the rising cost of energy, the low power consumption of the projectile weaving machine, together with its minimal maintenance requirement, is an increasingly important advantage.
Where maximum efficiency in the production of high-quality standard fabrics made from spun or filament yarns is called for, the latest-generation air-jet weaving machine, demonstrates its strengths. A high weft insertion rate of over 2000 m/min, combined with extensive automation, user-friendliness and small footprint result in top profitability for competitive weaving mills. A maximum working width of 4 metres also allows cost-efficient