Top Feed Mechanism - Brother b831 Service Manual

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When machine pulley O turns in the direction of the arrow, the rotation is conveyed to upper shaft O and causes the
rotation of top feed eccentric wheel O-
The top feed eccentric wheel crank O is moved in an arc by top feed eccentric wheel O' via top feed connecting rod O-
Motion is conveyed to bell crank O via top feed shaft O which is affixed to top feed eccentric wheel crank O.
Bell crank link O causes the up-down motion of top feed presser link O via bell crank O-
The lop feed presser link O 'S guided by the groove (oval) of middle presser guide plate <E> and conveys motion to top
feed presser bar O.
Middle presser ® affixed to top feed presser bar ® is caused to move up and down.
By loosening wing nut ® and adjusting the position of hinge screw the amount of motion of lop feed eccentric
crank O is changed and alteration of the amount of up-down motion of middle presser ® becomes possible.