Singer Class 457 G 1 - To Set the Needle Bar Yoke

Figure 28
Figure 29
TO SET THE NEEDLE BAR YOKE
The needle bar yoke isdriven by the needle vibrating
eccentric through a connecting link. This connectirifl
link has an eccentric for fine adiustment which perm
the adjustment of the needle penetration to the throo<-
plate. The fine adjustment can be performed by turning
the eccentric stud "BP", Fig. 28, accessible through an
opening in the front of the arm at the right side of the
tension unit.
The front to back adjustment of the needle bar yoke
is possible through the guide screws "BU", Fig. 29 and
"BT", Fig. 30, located near the lower needle bar bus
hing ana secured by lock screws to prevent shifting. The
needle bar yoke through the guide screws can be so
adjusted that the yoke and the needle bar connecting
stud and link are perfectly In line for free operation.
The rear needle bar guide "BU", Fig.29, the needle bar
connecting stud guide block "BS", Fig. 30 and the need
le bar connecting link guide block "BR", Fig. 30 have
been adjusted at the factory. These adjustments should
not be changed.
Whenever a replacement of the needle
bar yoke is
required, a new adjustment must be made by means
of gauges which can be obtained from SINGER-Agen-
cies.
I
Figure 30
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From the library of: Superior Sewing Machine & Supply LLC