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Z-8550A, 8560A
12. TREADLE UNIT
103
12. TREADLE UNIT
12-1. Types
• Two types of treadle unit are available: a type which controls the automatic presser foot lifter and a type which does not
control it.
• It is possible to switch between the two specifications by <A> Changing the hooking position of the spring (1) inside the
treadle unit; <B> setting DIP switch No. 2; and <C> setting the treadle depression stroke.
SPECIFICATIONS Treadle unit -G Treadle unit -H
Operation Does not control the automatic presser foot lifter Controls the automatic presser foot lifter
<A>
Difference in
spring position
[a]
[b]
<B>
DIP switch
setting
DIP switch No. 2: OFF
<When treadle is depressed forward>
Presser foot control signal is not output while
treadle is being depressed.
DIP switch No. 2: ON
<When treadle is depressed forward>
Automatic presser foot lifting signal is output
immediately before the depression force suddenly
changes.
<C>
Signal setting
Make the settings in “12-3. Standard settings for
treadle depression stroke”.
Set the “Neutral position”, “Maximum forward
depression position” and “Maximum backward
depression position”.
Make the settings in “12-3. Standard settings for
treadle depression stroke”.
Set the “Neutral position”, “Maximum forward
depression position” and “Maximum backward
depression position”.
The modulation position for the depression force
at the first step is set automatically.
<D>
Depression force
<When depressing forward or depressing backward>
The depression force hardly changes at all from
the start of depression until the maximum
depression.
<When depressing forward or depressing backward>
The depression force suddenly changes at a point
between the start of depression and the
maximum depression.
<E>
Depression
signal
<When depressed forward>
Sewing machine starts.
<When depressed backward>
Sewing machine starts. (*1)
<When depressing forward or depressing backward>
Automatic presser foot lifting signal is output
immediately before the depression force suddenly
changes, and the sewing machine starts at the
point after the force suddenly changes.
(*1) The presser foot lifting signal is output while the treadle is being depressed backward. However, if DIP switch No. 1 is
set to OFF, the presser foot lifting signal is not output while the treadle is being depressed backward after the knee
switch has been used to lift the presser foot.
In addition, if memory switch No. 41 is set to “1”, the presser foot lifting signal is no longer output while the treadle is
being depressed backward.
1840M1839M
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