Pfaff 441-O - Thread Check Spring

20
Correct
setting:
Thread check spring
The thread check spring should have completed its stroke when the needle points
enter the material (which amounts to a stroke abt. 7 mm long).
20.0.1
20.0.2
Note: Actual sewing conditions may make it necessary to increase or decrease the stroke
ofthe threadcheck spring.
20.1 Thread the needlesand place a piece offabricunder the presserfoot.
20.2 Operatethe presserbar lifterto lowerthe presser footonto the material.
20.3 Loosen screw1 inthe elongatedhole ofstop 2.
20.4 Turnthebalancewheeltosewafewstitchesand bring thetake-uplevertoitshighest point.
20.5 Continue turning the baiance wheel in its normal direction to cause the thread check
spring to make a return stroke of 7 mm.
20.6 Inthis position, bring stop2incontact with thethreadcheckspringand tighten screw1.
20.7 Checkthis adjustment (see "Correctsetting").
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From the library of: Superior Sewing Machine & Supply LLC