Timing mark on, Lower timing mark lower, Upward stroke – SINGER 251 User Manual

Page 21: I on upward stroke, Hook point at center of needle

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21

TO TIME THE SEWING HOOK

LOWER

TIMING

MARK

LOWER

TIMING

MARK

ON

UPWARD

STROKE

Fig. 34A. Checking the Tinning of the Hook

on Machines with Tinning Marks at

Lower End of Needle Bar

I ON

UPWARD

STROKE

H

'IL

E27559

Fig. 34. Checking the Timing

of the Hook

(Viewed fronn Front)

PREPARATION:

Remove

presser

foot,

slide

plate,

throat

plate

and

feed dog.

Remove

face

plate

on

machines

on

which

timing

marks are on

upper half

of needle bar.

CHECK:

ON MACHINES ON WHICH TIMING MARKS ARE

ON UPPER HALF OF NEEDLE BAR-

When

lower timing mark

on needle bar is level with

lower end of upper needle bar bushing A

as shown

in

Fig. 34,

the point of the sewing hook should be at

the center of the needle, as shown in enlarged view

in

Fig. 35.

HOOK POINT

AT CENTER
OF NEEDLE

Fig. 35. Timing the Hook

(Viewed from Rear)

ON MACHINES ON WHICH TIMING MARKS ARE

ON LOWER HALF OF NEEDLE BAR-

When

lower timing mark

on needle bar is level

with

lower end of lower needle bar bushing K

as

shown in

Fig. 34A,

the point of the sewing hook

should be at the center of the needle, as shown in

Fig. 35.

TIMING:

Loosen two set screws

L, Fig. 35

in hub of hook.

Turn hook on its shaft, as required to bring point of

hook to center of needle, as shown above.

Make certain that hub of hook is against oil-re­

taining collar; then securely tighten screws

L.

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