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Junker
& Ruh
Patented
in the UK in 1877 by E.T Hughes, this German Junker & Ruh
domestic lockstitch was subsequently marketed in Britain by George
Whight and named "Columbia".
The novel chain drive arrangement was summarised as followed:-
"The chain pulley B2 on the flywheel B1 is cast with small
projections or teeth, and the chain is placed on edge in a groove
on the pulley B2 in order to facilitate placing it over the
teeth. The chain also passes over pulley B3 on shaft B, and
is tightened, when necessary, by an eccentric arrangement which
moves the wheel B1 away from the shaft B. The chain is made
of soft-iron wire with open links, which are locked and hardened
when in position."
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