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Z-8550A, 8560A
12. TREADLE UNIT
104
12-2. Standard setting values
SPECIFICATIONS Treadle unit -G Treadle unit -H
Operation
Automatic presser foot lifting
does not occur
Automatic presser foot lifting
occurs
Spring position setting
No modulation at 1
st
step forward
or backward
(Figure [a] on previous page)
Modulation at 1
st
step forward
and backward
(Figure [b] on previous page)
Function
No.
Signal
(Diagram
below)
Function
Length from S0
(mm)
Force
(N)
Length from S0
(mm)
Force
(N)
- S0 Neutral point 0 - 0 -
82 S1
Forward automatic
presser foot lifting point
- - 2 (*1) 10
83 S2
Low speed operation
starting point
3 10 5 25
84 S3
Speed change starting
point
6 - 7 -
85 S4
Maximum speed arrival
point
S5-1 - S5-1 -
- S5
Maximum forward
depression point
14.5 12 14.5 32
81 S6
Backward automatic
presser foot lifting point
- - 2 (*2) 14
80 S7
Thread trimming
operation point
5 22 5 35
- S8
Maximum backward
depression point
8 28 8 43
(*1) Enabled when DIP switch No. 1 is set to “ON” and memory switch No. 13 is set to “1”.
(*2) Enabled when memory switch No. 12 is set to “0”.
• When the connecting rod installation position is on the inside, the setting value is the amount of movement when the
treadle is depressed forward or backward.
• For treadle unit -H, the point (F) where the forward depression force changes is in between S1 and S2, and the point (R)
where the backward depression force changes is between S6 and S7.
1841M
Depressed backward Neutral Depressed forward
Sewing
speed