Friday, 4 September 2009

Warp Knitting|Chain link Profile|Oldies but Goldies

1. Profile chain links for N and E pattern drives

The profile N and E chain links are always produced as new parts, in conformity with the specific order and can, therefore, be supplied with the new designation already starting from 01.01.2004. Due to the fact that these chain links are used at high machine speeds, they are subject to the same regulations as pattern discs. Therefore, a more extensive la-belling is necessary, which, however, is fully in conformity with the designation of the pat-tern discs. Due to the reduced space required, only six different details should be applied to a profile chain in the future. The machine type and the degree, for example, will no longer appear on profile chains for tricot machines in the future. Fig. 1 shows the prescribed designation of profile chain links starting from 01.01.2004. Apart from the guide bar position, all the other data will appear at least once per pattern repeat on each chain link. The guide bar position should only appear in case of restrictions to certain positions, for high-speed machines.

A -Chain link height with new continuous numbering system starting at 0,1,2 etc.,
will show only one number. The labelling will depend on the number of chain links
per stitch course (tempi). For the lapping 10/12// the labelling of the first six chain
links is done – as standard -for three chain links per stitch course (3 tempi) in the
following sequence: 1-0-0-1-2-2 and in case of four chain links (i.e. the first eight
chain links): 1-0-0-0-1-2-2-2. Only in special cases, for designating a special grind
ing, for example, will the chain links be described differently.

This means that from January 2004 onwards, the chain link height always corresponds to the current gauge, for which this shog movement of the guide bar had been optimised, even if the machine is not fully needled. Please see in this re-spect the pattern disc description in our Information Service No. 26/2003.

B -Serial number of the chain link within the entire chain. This number represents the beginning of the requested lapping, enabling a quick and reliable new assembly of the chain after an undesired falling asunder of the chain.

C -Gauge designation only in E or F for which this chain link had been produced (E corresponds to needles per inch and F corresponds to needles per 25 mm), thus, replacing the term „fine“ and/or ER. As far as standard machines are concerned, the gauge designation on the chain link is always identical with the specified machine gauge. In case of some Raschel machines, equipped with shog levers on the pattern drive, a second pattern drum and not fully set needle bars, it might happen that the pattern chain gauge deviates from the machine gauge. In this respect please see the pat-tern disc description in our Information Service No. 26/2003.

D -The number of knitting motion (Gang) corresponds to the initial knitting motion of the machine for which the curve of this profile chain had been developed, so that it can differ from the current knitting motion (Gang) of customer's machine type. In order to ensure that in the future the customers of tricot machines can assign the supplied pattern chains to the various machine types, please find in Table 1 the currently used numbers of knitting motion (Gang) and the respective previously stamped ma-chine types.

E -Indication of the applicable guide bar position(s), if the disc cannot be used for all positions of the relevant machine; due to lack of space, however, without the word „only“, e.g. GB2

F -Number of stitch cycles as ratio. In case of chain links this number describes how many chain links are used per stitch cycle, e.g. 16:1 means 16 stitch cycles per revolution of an N pattern drum (48 chain links per circumference), replacing the former designation 3 tempi (3 chain links per stitch cycle);16:1 for an E pattern drum (16 chain links per circumference) means that only one chain link is used per stitch cycle (1 tempi)

2. Plain and polished (ground) chain links for N pattern drives

Recently these chain link types had already been labelled with the current numbering sys-tem 0,1,2 etc., the gauge numbering, however, had been done in reverse order, e.g. as 28

In the future these chain links will continue to be labelled with the chain link height 0,1,2, thegauge, however, will get the new designation: e.g. E 28.The mix of new and old chain links within a new chain at customer's factory can be donewithout any problems; what is different with new chain links is only the way of specifying thegauge.

3. Plain and polished (ground) E, H, and S chain links for E pattern drives and special pattern drives

Today, large quantities of these non-profiled chain links (which can be easily combined) are still on stock at customers’ and manufacturers’ companies and can be used for an almost unlimited period of time. Nowadays, the use and production of these chain links is mainly restricted to the current machinery programme of Karl Mayer Wujin (China). In view of the high re-employment rate of the old chain links, it would be most dangerous to mix these chain links with newly produced chain links having another designation. Besides, the change-over process would take several years. Therefore, we have decided in the Karl Mayer Group not to change the designation of these chain link types, but to supply them with the previous identification, as long as they are ordered by customers.

This new way of designating the chain links ensures a standardisation of the labelling of all chain link types, thus, making their daily use much easier. Besides, the specification of the most important features is identical to that of the pattern discs, being continuously applica-ble for all kinds of pattern systems. All the relevant data consist of numbers (digits) or the same English terms used world-wide. All the other data previously existing on chain links, are either cancelled or replaced. Further information, however, could be added on the chain links for special applications.

In the first six months of the next year, an information sheet regarding the changed labelling of chain links will be added to every consignment of profiled pattern chains for machines and/or spare parts.

Fig. 1: Designation of profiled N and E chain links

Table 1: Survey on knitting motions and types  for tricot machines