Singer Class 457 G 1 - Timing and Other Adjustments; To Set the Thread Take-Up Spring; To Set the Presser Bar

TIMING AND OTHER ADJUSTMENTS
The instructions on the following pages ore for Ad
justers and Mechanics only.
TO SET THE THREAD TAKE-UP SPRING
The thread take-up spring "AJ", Fig. 16, set at the
factory for normal sewing conditions,
must hove suffi
cient free movement to complete its action and should
be at rest against the upper end of the thread take-up
spring regulator "AH", Fig. 16as the pointof the needle
in its downward stroke is opprox. 1/16 inch = 1.6 mm
above the material. The action of the spring should be
sufficient to assure a light tension on the thread when
same passesaround the bottom of the bobbin cose and
casts off the hook point. By loosening the tension retain
ing screw "AG", Fig. 16 the tension complete can be
rotated until the spring regulator is in the desired posi
tion.
The tension of the thread take-up spring "AJ", Fig.16
is set by turning the tension stud "AK", Fig. 16 either
toward the right to increase it or toward the left to
decrease Itwith the tension screw "AG", Fig.16 securely
Figure 16
tightened. The tension on the thread take-up spring
should be sufficient to insure its action at top speed;
however, it should be light enough so that the spring
will move all the way down before the thread is pulled
over the tension wheel. The tension on the thread tok*
up spring requires different settings depending upo.
the size of the thread and other particular sewing con
ditions.
TO SET THE PRESSER BAR
In order to align the presser foot with the needle,
lower the presser foot onto the throat plate and loosen
the presser bar position guide pinch screw "AL", Fig.17
through the opening in the face plate. Then move the
presserfoot
into the desired position and securely tigh
ten the pinch screw. The presser bar lifter must be set
so that a presser bar lift of 9/32 inch = 7.15 mm is
obtained.
0
Figure 17
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From the library of: Superior Sewing Machine & Supply LLC