Chain links and electronic control of shogging

The cost of chain links and the labour involved in chain assembly are major problems with multi guide bar machines.

Ground guide bars are generally controlled directly from links or pattern wheels moving at two links per course (A). The pattern guide bars are controlled indirectly through shogging levers (B) (Fig. 28.2), using only one link per course (either they only inlay or they are caused to automatically overlap in the same direction after the underlap is completed by an eccentric working onto the shogging levers).

Leverage in the shogging arrangement can reduce the height and weight of the links. Split-chain drums that can be stopped during miss-lapping in between motif patterns can further reduce the link requirements. However, lace designs can still involve as many as 15000 links, which can weigh over a tonne (1000 kg).

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