Seiko TH-2B - Needle-Hook Tip Clearance Adjustment; Needle Bar Rock Frame Positioning

©Adjusting the.clearance. be tween needle and the tip of hook
Pig-- fi
Loosen set screw(l)for hook
rock frame, then outer hook
should be mo-ved"4—^ right-
ward or leftward. (Fig. 6)
needle
@
Ij aP / - tip of
— hook
tip of hook
—0.05—0.3mn
©determination of the position of
lieedle bar rock frame for 7B & 8B
needle bar rock frame hinge stud,
fdt ooai the needle bar rock frame hinge stud(small)
(4) positioned lower part of needle bar rock frame(2), and also the
2^ needle bar rock frame hinge stud(large) (6).
® ^ ^Se stud(large)(6) to
° moving the needle bar rock frame leftward &
of thT the balance wheel, determines smooth position
of feed dog needle and center of the needle hole
position, tighten the set screw(l)of
r -fclie needle bar
Inn^ ^ hin^ stud(small)(4) to slightly the needle bar bar
rock frame position bracket(8).
needle bar rook frame hinge stud(large) (6) to the aide
wh«i f ^ frame(2), and then turn the balance
wheel and tighten the each screw exactly.
looseness of the leftward & rightward ^ of the needle
stitoh^skipplng resulted in the breaking of needle,
12 -
From the library of: Superior Sewing Machine & Supply LLC