Height Of The Needle Bar And The Needle-To-Hook Timing - ELNA E9020 Service Manual

(3) Height of the needle bar and the needle-to-hook timing

[Confirming the timing between the main shaft and the hook driving shaft]
• Confim that the needle bar is positioned in the lowest dead point when the marker
dot on the thread cutter cam is aligned with the hook driving shaft ball bearing.
[Confirming the timing of the outer hook]
• In the aforementioned state, confirm that the marker dot of the outer hook (when
removing Mg sheet) faces just behind. (It is not necessary to check when the outer
hook is not removed.)
Adjustment drawing 1
Prepare two kinds of the jig needles of 29.1 mm and 32.7 mm long which have been
cut from the home use needles (SCHMETZ needle).
* Perfotrm the adjustment after adjusting the needle entry following the point of (1).
1. Attach the jig needle (29.1 mm) to the needle bar.
2. Set the needle to the left stitch base line, loosen needle bar connection screw
1 and adjust the height of the needle bar so that the jig needle (29.1 mm) is
aligned with the upper face of the race of outer hook when the needle bar is
positioned in the lowest dead ppoint.
Adjustment drawing 2
Replace the jig needle with that of 32.7 mm. Raise the needle bar and adjust so that
the center of the needle is aligned with the balde point of hook when the top end of
needle bar is aligned with the upper face of the race of outer hook. Then tighten
screw 2 in the hook driving shaft pulley.
How to adjust
Marker dot
Marker dot
Free arm bottom cover and throat plate
Location of components to be adjusted
Thread cutter cam
Projection
1
Disassembly
1
2
Adjustment drawing 1
Needle bar
connection
2 mm hexagon
wrench key
Adjustment drawing 2
Main shaft
Hook driving
shaft
2
Hook driving
shaft pulley
18