Brother DB2-DD7100, Service Manual

Page: 97 / 153

13. TREADLE UNIT ASSEMBLY
SL-710A
90
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 Treadle unit H
Operation Does not control automatic presser lifter Controls automatic presser lifter
<A>
Difference in spring
position [a] [b]
<B>
Signal setting Carry out the setting in "Setting method for
standard depression strokes" on page 92.
"F1" and "r1" are set at the neutral position. 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.
Depression force <When depressed forward and depressed backward>
The depression force hardly changes at all from
the start of depression until full depression.
<When depressed forward and depressed backward>
The depression force suddenly changes at a
point between the start of depression and full
depression.
Depression signal <When depressed forward and depressed backward>
No automatic presser lifter signal is output.
<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.
1839M
1840M
(1)
(1)