Clearance Between Needle And Rotary Hook - Janome MC7700 QCP Service Manual

CLEARANCE BETWEEN NEEDLE AND ROTARY HOOK

THE CLEARANCE BETWEEN NEEDLE AND THE TIP OF THE ROTARY HOOK (J) SHOULD BE BETWEEN –0.1
AND +0.05 MM
HEXAGONAL
SOCKET
SCREW (A)
NEEDLE BAR
SUPPORTER (B)
SETSCREW(E)
HOOK BASE
PLATE (H)
MASTER
NEEDLE (I)
–0.10 TO +0.05 mm
MECHANICAL ADJUSTMENT
HOLE OF NEEDLE PLATE (C)
CLEARANCES (D)
MUST BE EVEN
D
SETSCREW (G)
SETSCREW(F)
TIP OF HOOK (J)
[ADJUSTMENT I]
1. REMOVE THE TOP COVER (SEE PAGE 1) AND
PRESSER FOOT PRESSURE DIAL.
ATTACH MASTER NEEDLE (I).
2. TURN THE POWER SWITCH ON.
3. SELECT THE STITCH PATTERN
THE ZIGZAG WIDTH AT "7.0".
4. REMOVE THE PRESSER FOOT, NEEDLE PLATE
AND BOBBIN HOLDER.
5. LOOSEN THE HEXAGONAL SOCKET SCREW (A)
AND ADJUST THE CLEARANCE BETWEEN THE
NEEDLE AND TIP OF ROTARY HOOK (J) BY
MOVING THE NEEDLE BAR SUPPORTER.
CHECK THE CLEARANCE (D) BETWEEN THE
NEEDLE AND THE EDGE OF NEEDLE PLATE
HOLE. IF THE CLEARANCES (D) ARE NOT EVEN,
FOLLOW THE PROCEDURE BELOW
[ADJUSTMENT II].
[ADJUSTMENT II]
D
1. REMOVE THE BASE COVER AND BED COVER
(SEE PAGE 3).
2. TURN THE POWER SWITCH ON, AND SELECT
THE STITCH PATTERN
WIDTH AT "7.0",
3. REMOVE THE PRESSER FOOT, NEEDLE PLATE
AND BOBBIN HOLDER.
4. LOOSEN THE SETSCREWS (E) AND (F).
LOOSEN THE SETSCREW (G) JUST ENOUGH
TO MOVE THE HOOK BASE PLATE (H).
5. TURN THE HANDWHEEL TOWARD YOU UNTIL
THE TIP OF HOOK COMES JUST BEHIND THE
MASTER NEEDLE.
ADJUST THE CLEARANCE BETWEEN THE
NEEDLE AND THE TIP OF THE ROTARY HOOK
BY MOVING THE HOOK BASE PLATE UP OR
DOWN, TO WITHIN –0.1 TO +0.05 MM AT THE
LEFT AND RIGHT NEEDLE POSITIONS.
6. TIGHTEN THE SETSCREWS (E), (F) AND (G)
FIRMLY.
7. CHECK THE BACKLASH BETWEEN THE HOOK
DRIVE AND LOWER SHAFT GEARS.
SEE PAGE 14 FOR THE ADJUSTMENT.
8. ATTACH THE BASE COVER, BED COVER,
BOBBIN HOLDER, NEEDLE PLATE AND
PRESSER FOOT.
13
AND ADJUST
. ADJUST THE ZIGZAG