ELNA 9900 - LEAFLET, Руководство по обслуживанию

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12
elna 9900
Checking the Lowest Position of the Needle
1. Remove the spool stand, static head cover
(right) and left cover.
2. Turn the handwheel to set the index disk at
270
°
.
3. Push the needle bar down to engage the
needle bar clutch.
4. Turn the handwheel to set the needle bar at its
lowest position.
Use a lever type dial indicator to measure the
needle bar height.
5. Turn the handwheel clockwise until the indicator
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
Lever type dial indicator
Setscrews
Pointer