Presser Bar - Singer 250 Series Service Manual

■ Presser Foot Pressure
Removal:
Regulator
14
1)
RemoveD
andO .
2) lower presser foot.
3)
Turn pressure regulating dial to " DARN "' setting.
4)
Remove screw
A.
5)
Remove dial 8 .
6) Remove screws C.
7)
Remove pressure regulator assembly D.
Caution on reassembly:
a) Make certain that the presser bar pressure pin is lodged in the cav ity of presser bar E.
b) Make certain that pressure extention pin F is seated against outside cam surface G on knob 8 .
Adjustment of presser foot pressure:
Note:
Before adjusting presser foot pressure make certain that the presser foot is correctly adjusted
in height as expla ined
underD .
Check:
1)
Turn hand wheel until the feed dog is in its lowest position.
2)
lower lever
J .
3)
Dial
8
should be set at
" O"
setting .
4)
The pressure is correct when a piece of paper can be moved freely under the presser foot
but witt, only a slight res istance.
Setting:
1)
loosen screw
H.
2)
Raise or lower the presser bar E to obtain the correct pressure, making certain that the pressure
pin
F
is correctly on the cam surface
G.
3) Tighten screw H.
4
Presser Bar Assembly
- - - - - -
Removal:
1)
Remove
D, D
andllllJI .
2)
Remove screw
A
and presser foot
8 .
3) lower lever J and loosen screws C and D.
4)
Pull bushing
E
downwards, being careful with the thread cutter wh ich is very sharp.
5)
l ift guide F out of the slot and turn it to the right.
6) Remove pressure pin G, guide F, presser bar H, buhing E and pressure spring.
Note: Should it be necessary to ramove lifter lever J or tension releas ing lever K then proceed
as described above.
Caution on reassembly:
a) Make certa in that the thread cutter on the bushing
E
faces to the rear of the machine.
b) When bushing E is assembled , the top surface of the bushing should be al igned with the inner
surface of the arm.
Adjustments • Presser foot height
Check :
1) l ift lever
J
and turn hand wheel until feed dog is in Its lowest position.
2)
The distance between the inferior surface of presser foot 8 and top surface of throat plate
should be between 7.35 and 7.60 (.290-.300).
3)
lower lever J and verify that presser foot is al igned with the slots in the throat plate as in
sketch l.
Setting :
1) lower lever
J
and loosen screw C, ra ise or lower presser bar H as requ ired to obtain correct
height. Assure sideways alignment as indicated by l .
2) Fasten screw C.
Note: After adjusting, check for correct pressure according to
Ill.II .
FORM 723 (1172)