Seiko TH-2B - Cam Position Adjustments; Connecting Rod Cam Position; Feeding Cam Position Adjustment

1. POSITION OF CAM(i^^28102) FOR CONNECTING ROD
Turn the h^Andwheel until the needle bar lowers by O.ifmm from
its top dead center. At this point, set the cam(;^f28l02) with
the groove on the cam faces the top.
( or -l^urn the cam, /'/28102, to make i^mm distance between the groove
on the cam and the center of the upper shaft when the needle is
at its highest point shown as the following figure.)
And tighten the screw(a) securely.
//28102
center of
upper
shaft I
Groove.
1
• 1
1\
i
1^
* Needle lowers by 0.4 mm from
its highest point
* Needle at the highest point
2. POSITION OF FEEDING CAM(//28063)
STANDARD: When swaying the stitch length regulating lever(//28l6i|)
up and down at the point where the point of hook reaches
Imin this side of the needle, the feed dog and the needle
should be still.
HOW TO ADJUST:
(7B and 8B type)
Turn the feed cam(/ff28063) until the lower edge of the second
screw in rotating direction aligns with the upper edge of the
hole A on the cara(#28102) and tighten the screw(B). (Fig. 3 )
(6B, 2B and 2/RF type)
Turn the feed cam(J/28063) until the lower edge of the second
screw in rotating direction aligns with the upper edge of the
groove on the cam and tighten the screw(B). (Fig. 4 )
7p,oB ^^ype
F;,. 3
center of uppei
qhaf t
From the library of: Superior Sewing Machine & Supply LLC