J.W.Bartlett

Bartlett's design was registered in the UK by M.A.F.Mennons in 1864.
The needlebar i, Fig.2, is reciprocated in a guide oscillating about a fixed pivot, by a pin on a disc crank e at the end of a shaft in the casing d, Fig.1. The bobbin l is carried on a bracket attached to the needle bar, and a pin, on the top of the latter, having a roughened surface, affects the feed. The length of stitch is regulated by an obliquely-slotted plate m. A single or double looper r is reciprocated laterally by a cam-actuated rod s, and a stop t on the looper held against the bracket arm by a spring u causes a second reciprocation at right angles to the former one.