Treadle Unit Assembly; 13-1.Types - Brother S-710A Service Manual

13. TREADLE UNIT ASSEMBLY

13-1.Types

• Two different types are available: a type that controls the automatic presser lifter, and a type does not control the
automatic presser lifter.
• The two specifications are changed over by (A) changing the attachment position of the spring (1) inside the treadle
unit, and (B) resetting the depression stroke signal.
Specification Treadle unit G
Operation Does not control automatic presser lifter
<A> [a]
Difference in spring
position
<B> Carry out the setting in "Setting method for
Signal setting standard depression strokes" on page 92.
"F1" and "r1" are set at the neutral position.
Depression force <When depressed forward and depressed backward>
The depression force hardly changes at all from
the start of depression until full depression.
Depression signal <When depressed forward and depressed backward>
No automatic presser lifter signal is output.
Treadle unit H
Controls automatic presser lifter
[b]
(1)
1839M
Carry out the setting in "Setting method for
standard depression strokes" on page 92.
"F1" and "r1" are set at the first modulation point
for the depression force.
<When depressed forward and depressed backward>
The depression force suddenly changes at a
point between the start of depression and full
depression.
<When depressed forward and depressed backward>
An automatic presser lifter signal is output at the
point before the depression force suddenly
changes, and the sewing machine starts at the
point after the depression force suddenly
changes.
SL-710A
13. TREADLE UNIT ASSEMBLY
(1)
1840M
90