The presser bar spring-support screw (figure 4-11 [G]) acts as a suspension point for the presser bar spring. The screw is loosened approximately one-fourth of - an inch to allow for the removal of the presser bar spring. Do not remove the presser bar spring-support screw from the machine.
The presser bar spring (figure 4-11 [H]) applies a constant pressure to the presser bar. To remove the presser bar spring from the machine, lower the presser feet and then grasp the underside of the spring as near the support screw as possible with two fingers of one hand over two fingers of the other hand. Now slide the spring outward to the head of the support screw, rolling the spring up and out of the machine.
The presser bar lifting releasing lever bracket guide screw, (figure 4-11 ) acts as a track and guide for the presser bar lifting releasing lever bracket. Remove the presser bar lifting releasing lever bracket guide screw by unscrewing it from the machine.
The presser bar position guide (figure 4-7 [D]) acts as a track to control the presser bar position guide lever. To remove the presser bar position guide, you should loosen (six turns) the spline screw on the rear side nearest the face of the machine and push the guide through the recess at the top of the machine head.
The presser bar position guide lever is used to align the presser foot, and it operates in the slot of the presser bar guide.
NOTE: The presser bar position guide does not screw out. Loosen the pinch screw on the presser bar position guide lever (figure 4-11 [K]) by inserting the screwdriver into the opening on the rear side of the machine head. This is necessary to allow movement of the presser bar for the removal of attached parts.
The alternating presser foot is the rear presser foot and holds the material in place while the needle and front presser foot move forward making another bight. To remove the rear presser foot, you unscrew the presser foot position screw on the left side of the presser bar. Raise the presser bar to its highest position and remove the foot from the rear.
The presser bar spring bracket (figure 4-7 [E]) transfers the tension from the presser bar spring to the presser bar. To loosen the presser bar spring bracket from the presser bar, insert the screwdriver through the lower opening provided in the back of the face of the machine. Loosen the presser bar lifting bracket pinch screw (figure 4-11 [C]). Remove the presser bar lifting bell crank retaining screw and lifting bell crank (figure 4-7 [F] and [G]). Now remove the presser bar (figure 4-7 [M]) in a slow upward motion.
The presser-lifting bell crank alternately applies lift to the presser feet. Remove the presser-lifting bell crank retaining screw (figure 4-7 [F]) and then extract the bell crank (figure 4-7 [G]) from the machine.
The presser bar lifting bracket is alternately a hinge point and lifting point for the two presser bars. It is also the controlling part for the presser feet while work is being inserted and removed, and it gives support to the thread tension release slide.
If binding should occur while you are removing the presser bar, insert a screwdriver into the lower slot of the presser bar and rotate it while applying upward motion on the presser bar.
When you remove the presser bar, the following parts will fall off: the presser bar spring bracket (figure 4-7 [E]), the releasing bracket, the releasing bracket spring, the lifting bracket, and the guide lever.Continue Reading