Needle Bar-Presser Unit Assembly - promelectroavtomat XL2120 Service Manual

Assembly Procedure

Needle Bar-Presser Unit Assembly

1. After setting the lever spring in the letter V direction in the U-bend part of the thread loosening lever and
inserting into the base holder shaft, attaché the retaining ring CS4. (The lever spring should be rested on the
base holder on the left side and on the upper side of the U-bend part on the right side.)
2. Insert the presser lifter in the presser lifter shaft and attach the retainer ring E4.
3. Align the protrusion of the needle bar stopper against the U groove of the base holder and temporarily fasten
it with the one screw (bolt, socket, M 3 × 6) from the back.
4. Set the screw (set screw, socket (CP) M 5 × 8) on the presser bar clamp, insert the presser bar into the base
holder, the presser bar clamp, and the spring in this sequence, and temporarily fasten the screw (set screw,
socket (CP) M 5 × 8).
5. Align the reference hole for fixing against the protrusion of the base holder and secure it with the one screw
(screw, bind B M 4 × 6) from the back.
6. Attach the retaining ring E5 to the stud for thread take-up lever supporter.
7. Insert the dome spring washer into the stud for thread take-up lever supporter with its convex side facing the
retaining ring.
8. Insert the thread take-up lever supporter into the stud for thread take-up lever supporter.
9. Insert the stud for thread take-up lever supporter into the base holder and secure it with the one screw
(Phillips, pan head screw with spring and plain washers, size 3 × 8DB).
10. Insert the riveting stud for the Z fine adjusting plate from behind the needle bar supporter and temporarily
fasten it with the screw (Phillips, pan head screw with spring and plain washers, size 3 × 8DB).
11. Insert the plate to prevent reverse attachment of needle from behind the needle bar clamp (the cut surface)
until it reaches above the needle clamp.
12. Insert the needle clamp into the needle bar, bring it up as far as it goes, and temporarily fasten it with the
needle set screw.
13. Secure the needle bar thread guard with the 2.38 screw.
14. Temporarily insert the needle bar into the needle bar supporter, run it through the needle bar clamp of the
needle bar crank rod assembly, and temporarily fasten with the screw (set screw, socket (FT) M 4 × 4).
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