JUKI MF-7800D Series, Engineer'S Manual

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(2) Adjusting the rocking thread take-up
1. Length of the rocking thread take-up
(1) Dimension A from the center of the shaft to the thread hole face of rocking thread take-up is the standard
length of rocking thread take-up .
2. Position of the rocking thread take-up
(1) Install so that rocking thread take-up is flush when the needle bar is in its lowest position.
3. Timing of the rocking thread take-up
(1) It is the standard timing that rocking thread take-up is in
its lowest position as well when the needle bar is in its lowest
position.
Timing of rocking thread take-up is performed by
adjusting the position of rocking thread take-up ball arm
.
4. Relation between the timing of rocking thread take-up and
the needle thread loop
(1) When using the excessively stretchable thread or the hard-
to-stretch thread, the size of needle thread loop can be
changed by changing the timing of rocking thread take-up
.
(2) Relation between the timing of the rocking thread take-up
and the size of needle thread loop is as shown in the
table on the next page.
(The relation becomes reverse when using the needle bar
thread take-up = standard seams and when it is not used =
soft seams. So, be careful.)
A
4mm
A
Standard Adjustment
↑
Anti-operator’s side
Operator’s side
↓
Dimension A
Standard seams 90
Soft seams 98
Unit : mm
Flush