Feed Mechanism - Singer 250 Series Service Manual

II
Feed Mechanism - Feed Lift Shaft - Actuating Shaft
Removal:
1) Remove D a n d o .
Feed Lifting Shaft
Removal:
1) Remove nut A and eccentric screw B.
2) Loosen both screws C with a minimum of 2 turns .
3)
Dislocate the two hinge centers E by pushing shaft D first to the right and then to the left,
remove shalt D.
Caution on reassembly:
a) Position the two hinge pins E so that two screws C are located over the flat of each pin
which is indicated by a chamfer on the head of each pin
E.
b) Before tightening the two screws
C
insure that there is no lateral play of shaft D and that
connecting rod F is not forced sideways.
c) Assemble the eccentric screw B with the eccentric position towards the rear of the machine.
Feed Actuating Mechanism
Removal:
1) Remove both screws G and feed dog H.
2)
Remove nut J and eccentric screw
K.
3)
Loosen both screws L with at least two turns.
4) Dislocate the two hinge pins N by pushing shaft M first to the right and then to the left and
remove shalt M together with feed dog support P.
5)
To disassemble the unit formed by shaft M and feed dog support P, loosen the two lock nuts
0, then remove the two screws R together with the lock nuts 0 .
Caution on reassembly:
a) Before tightening the two lock nuts O adjust the two screws R so that feed dog support P
moves freely but without play.
b) Position the two hinge pins N so that the two screws L are located over the flat of each pin
which is indicated by a chamfer on the· head of each pin N.
c) Before tightening the two screws L insure that there is no lateral play of shaft M and that feed
fork S is not forced sideways .
d) Assemble eccentric screw K with the eccentric position towards the front of the machine.
Adjustment of feed dog alignment:
Check:
1) Remove needle and presser foot.
2) Set stitch length dial on 4 mm. (6 s.p.i.) .
3)
Turn hand wheel until feed dog is in its highest posi tion .
4)
The feed dog should be . in center of and parallel to the slots in the throat plate.
5)
Continue turning hand wheel_. The feed dog should not strike front or rear edge of throat plate
slot. ·
Setting:
1)
Remove throat plate.
2)
Loosen slightly both screws G. position feed dog
H
as required and tighten both screws G.
3) Install throat plate and recheck.
4) If adjustability of feed dog H is insufficient. the following settings are to be made.
Sideways
setting of
feed dog:
1)
Loosen the two lock nuts 0. turn screws R. by unscrewing one then screwing in the second the
same number of turns. as required to center feed dog H.
2) Before retightening lock nuts O make sure there is no sideways play of feed dog support P .
Front to rear setting of feed dog:
1) Loosen nut J . turn eccentric screw
K
clockwise or counter clockwise as required.
2)
Tighten nut
J.
Caution:
Do not turn eccentric screw K more than '/. turn in each direction .
Adjustment of feed dog height:
Check:
1) Set stitch length dial to 4 mm. stitch length (6 s.p.i.).
2) Turn hand wheel until feed dog H is in its highest position.
3)
The height of the feed dog
H
over the top surface of throat plate should be
1.00
to
1.10
mm.
(.040- .043)
(see sketch) .
Setting:
Loosen lock nut A. turn eccentric screw B clockwise or counter clockwise as required.
Caution:
Do not turn eccentric screw B more than a '/. turn in each direction.
FORM 723 (1172)
49