Treadle Unit Assembly; Types - Brother S-7200B Service Manual

Single needle direct drive straight lock stitcher with thread trimmer
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11. TREADLE UNIT ASSEMBLY

11-1. Types

The two types of treadle unit that are available are the type that controls the automatic presser foot lifter and the type that
does not.
You can switch between the two types by <A> changing the hooking position of the spring (1) inside the treadle unit; <B>
setting DIP switch 2; and <C> setting the treadle stroke.
Specifications
Treadle unit G
Operation
Does not control automatic presser lifter
<A>
[a]
Difference in
spring
position
<B>
DIP switch 2: OFF
DIP
switch
<When depressing the treadle forward>
setting
The presser foot lifter control signal is not output
when the treadle is being depressed.
<C>
Carry out the setting in "Setting method for
Signal setting
standard depression strokes" on page 58.
Set the neutral position, maximum forward position
and maximum backward position.
<D>
<When
Depression
backward>
force
The depression force hardly changes at all from the
start of depression until full depression.
<E>
< When depressed forward >
Depression
The sewing machine starts.
signal
< When depressed backward >
The sewing machine starts. (NOTE 1)
(NOTE 1) The presser foot lifter control signal is output while the treadle is depressed backward. However, if DIP switch 1 is
set to OFF, the presser foot lifter control signal is not output when the treadle is depressed backward after the
knee switch has been used to raise the presser foot.
Furthermore, if Function No. 41 is set to "1", the presser foot lifter control signal is not output when the treadle is
depressed backward.
depressed
forward
and
Treadle unit H
Controls automatic presser lifter
[b]
(1)
1839M
DIP switch 2: ON
<When depressing the treadle forward>
The automatic presser foot lifter signal is output at
the position before the treadle depression force
suddenly changes.
Carry out the setting in "Setting method for standard
depression strokes" on page 58.
Set the neutral position, maximum forward position
and maximum backward position.
The first modulation position for the treadle
depression force is set automatically.
depressed
<When
depressed
backward>
The depression force suddenly changes at a point
between the start of depression and full depression.
<When
depressed
backward>
An automatic presser lifter signal is output at the
point
before
changes, and the sewing machine starts at the point
after the depression force suddenly changes.
S-7200B
11. TREADLE UNIT ASSEMBLY
forward
and
forward
and
the
depression
force
(1)
1840M
depressed
depressed
suddenly
56

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