Keats patent.

J. & G.E. Keats

This elegant domestic lockstitch design was patented in the UK in 1861.
The presser foot "g" is employed for fabric feed, this being motioned by the needle-driving cam "F". An in-line shuttle transport is achieved via crank-plate "a" driven by shaft "E" in gear with top shaft "D". A slightly elaborate, but effective, adjustable top thread tension device, powered by coiled spring "n" completes the package.

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