Enhanced quality of split selvedges on airjet and rapier weaving machines

The new technology of the DiscoLeno represents an innovative leap forward in the formation of leno selvedges and thus makes a significant contribution to further performance enhancement and to the flexibility of the DORNIER system family of air-jet and rapier weaving machines.

Disc leno device "DiscoLeno" for dobby model In the 1960s, the founder of the company, Peter Dornier Sen., coined the phrase "The best weaving machine is only as good as its weakest component."

As developments in recent years have succeeded in increasing the operating speed of DORNIER airjet weaving machines from 650 rpm to almost 1 000 rpm, it has quickly become clear that the weakest component at these high speeds currently is the leno device.

On all the high-speed airjet weaving machines available on the market, it leads to premature wear associated with filling insertion malfunctions, deficient reversibility and poor handling.

Disc leno device "DiscoLeno" for dobby model To satisfy ever more sophisticated customer requirements with regard to flexibility and speed, DORNIER saw a solution in the development of the new universal full-leno device DiscoLeno.

In the DiscoLeno, the company presents a 2-thread full-cross leno device with synchronous motor drive, a feature unique in the construction of weaving machines. It operates with normal king and flanged bobbins and copes under weave control with any pick density variation and fabric construction.

This new DORNIER technology, which forms the subject of several patents, offers our customers a variety of advantages both in terms of machine and weaving technology, including:

•	wear-free operation at maximum speeds of up to 1200 rpm
•	the use of normal king and flanged bobbins
•	full reversibility of the leno device
•	simple leno thread monitoring by means of conventional warp stop motion droppers
•	use of full leno device for all types of fabric thanks to weave-controlled interlacing
•	shed closing can be chosen freely in the display separately for each leno device
•	elimination of 2 base heald frames including drive
•	airjet weaving machines are almost always limited in terms of speed by the shedding motion. By cutting out the 2 selvedge heard frames, a basic speed reserve of approx. 80-100 rpm can be utilized when operating across 6-8 heald frames.
•	reduction in leno yarn breaks to an absolute minimum due to short front shed and low stress on leno thread
•	cost saving with regard to leno material due to just 2 threads and use of very fine leno threads of dtex 33 (30 den)
•	excellent setting-up for the weaver due to red point-reset key and conventional catch selvedge yarn guidance
•	QSC-compatible. The leno devices remain as an autonomous device when a style change is introduced on the weaving machine
•	no bulking of the fabric selvedges caused by the leno device, no differences in tension relative to the fabric selvedge
•	good and stable interlacing thanks to full leno technique
•	can be used on all rapier weaving machines with a heald length of 380 mm or more and airjet weaving machines with a heard length in excess of 330 mm
•	can be used without any limit on the number of heald frames
•	warp stop motion setting not limited by weaving parameters, as the leno device is fitted in front of the heald frame package
•	can be retrofitted to all DORNIER airjet and rapier weaving machines with the CAN-bus control system

The market launch is scheduled for November 1996 and will in the first instance be limited to a small number of machines.
Our Sales Department will be happy to provide further technical details and offer application-related advice.