the presser bar lifting bracket pinch screw (figure 4-11 [C]). Turn the balance wheel toward the operator until the feed dogs rise to meet the forward presser foot at the top of the throat plate. Press the presser bar lifting bracket down to the hand lifting lever (figure 4-11 [D]). Tighten the ---- presser bar lifting bracket pinch screw (figure 4-11 [C]) and the lifting crank pinch screw (figure 4-11 - [B]).
5 . Adjusting the upper thread - tension - releasing lever
The upper thread-tension release allows the goods to be removed without the needle thread breaking.
a. Lift the presser-lifting lever and observe the thread tension disc. It should separate to release the thread. If not, proceed as follows:
b. Remove the thread controller assembly from the machine as follows:
(1) Remove the thread controller assembly retaining screw (figure 4-6 ).
(2) Loosen the thread controller stud setscrew (figure 4-6 [J]).
(3) Pull the thread controller assembly away from the machine.
c. Bend the thread releasing lever (figure 4-12 [B]) away from the thread controller assembly to increase the amount of the release and toward the plate to decrease the tension as needed.
d. Reattach the assembly to the machine and observe the operation. Repeat steps a through d if necessary.
6. Setting the feed indicator disc
Loosen the setscrew in the feed indicator disc (figure 4-1 [E]) so that it spins on the arm shaft. Depress the feed indicator plunger and turn the balance wheel toward you until it drops; keep turning the balance wheel toward you until it stops. The feed-driving eccentric is now set at 3 1/2 SPI.
NOTE: With the plunger engaged, turning the balance wheel toward you decreases the SPI, and turning the balance wheel away from you increases the SPI.
The ideal setting for the indicator disc on the sewing machine is 8 SPI. You accomplish this setting by engaging the plunger and turning the balance wheel approximately one-fourth of a turn away from you. Release the plunger, make several inches of stitches on a piece of paper, and count the total number of stitches per inch. If you are sewing 8 I, depress the plunger and slow/y turn the balance wheel toward the operator until the plunger drops.
Release the plunger and the balance wheel.
Now turn the feed indicator disc (figure 4-1 [E]) on the arm shaft until 8 shows in the window on the uprise of your machine.
Tighten the set screw in the feed indicator disc.
7. Setting the thread controller spring
The thread controller spring prevents the needle from piercing the thread. It takes the slack out of the needle thread until the point of the needle enters the material.
To properly set the tension on the thread controller spring, you must first loosen the thread controller stud setscrew on the tension stud (figure 4-6 [J]). Turn the tension stud counterclockwise for more tension or clockwise for less tension.
A properly adjusted controller spring rests on the thread controller spring stop as the point of the needle enters the material. This action releases all tension on the needle thread.
8. Setting the controller spring stop You may have to make an adjustment to the controller spring stop to allow the thread controller spring to operate properly. This is a very simple adjustment. By loosening the tension stud screw, shown in figure 4-6 (I), you raise the stop for less action or lower it for more action.
9. Adjusting the thread tension
The thread tension will be the last adjustment required. In most cases, you can make any adjustment required by turning the thumb nut (figure 4-12 [A]) on the needle thread tension disc.
If the stitch is locking on top of the material, turn the nut counterclockwise. ThisContinue Reading