Brother International S-7200B Service Manual - Page 63

Treadle Unit Assembly, 11-1. Types

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11. TREADLE UNIT ASSEMBLY 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 changing the hooking position of the spring (1) inside the treadle unit; setting DIP switch 2; and setting the treadle stroke. Specifications Operation Difference in spring position Treadle unit G Does not control automatic presser lifter [a] Treadle unit H Controls automatic presser lifter [b] (1) (1) DIP switch setting 1839M DIP switch 2: OFF The presser foot lifter control signal is not output when the treadle is being depressed. 1840M DIP switch 2: ON The automatic presser foot lifter signal is output at the position before the treadle depression force suddenly changes. Signal setting Depression force 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 depression force hardly changes at all from the start of depression until full depression. 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. The depression force suddenly changes at a point between the start of depression and full depression. Depression signal < When depressed forward > The sewing machine starts. < When depressed backward > The sewing machine starts. (NOTE 1) 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. (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. S-7200B 56

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S-7200B
11. TREADLE UNIT ASSEMBLY
56
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
Treadle unit H
Operation
Does not control automatic presser lifter
Controls automatic presser lifter
<A>
Difference in
spring
position
[a]
[b]
<B>
DIP
switch
setting
DIP switch 2: OFF
<When depressing the treadle forward>
The presser foot lifter control signal is not output
when the treadle is being depressed.
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.
<C>
Signal setting
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.
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.
<D>
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.
<E>
Depression
signal
< When depressed forward >
The sewing machine starts.
< When depressed backward >
The sewing machine starts. (NOTE 1)
<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.
(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.
1840M
1839M
(1)
(1)