Checking The Lowest Position Of The Needle - ELNA 9900 Service Manual

Checking the Lowest Position of the Needle

Lever type dial indicator
Setscrews
1. Remove the spool stand, static head cover
2. Turn the handwheel to set the index disk at
3. Push the needle bar down to engage the
4. Turn the handwheel to set the needle bar at its
5. Turn the handwheel clockwise until the indicator
Pointer
12
(right) and left cover.
270°.
needle bar clutch.
lowest position.
Use a lever type dial indicator to measure the
needle bar height.
reads 0.2 mm and read the angle (Aº) of the
index disk.
Turn the handwheel counterclockwise until the
indicator reads 0.2 mm and read the angle (Bº)
of the index disk.
Calculate the mean angle (Cº): C=(A+B–360)÷2
Turn the handwheel clockwise to set the index
disk at Cº.
Loosen the 2 setscrews and set the pointer at
0º (L). Tighten the 2 setscrews securely.
Check the following items if you have adjusted
the lowest position of the needle.
• Upper shaft timing
• Take-up lever timing
• Hook timing
• Thread cutter timing
elna 9900