10.3 Electro-pneumatic rapid stroke adjustment HP 13 - 7
The sewing-foot stroke and stitch rate are interdependent. A potentiometer is linked
mechanically with the adjusting wheel. By means of this potentiometer the control unit
detects what foot-stroke has been set and restricts the speed of rotation accordingly.
The values are given in the table on page 17.
The maximum stroke can be activated while sewing is in progress with the knee switch 2.
Caution! Danger of injury!
Turn off main switch!
Adjust the sewing-foot stroke only with the machine
switched off.
Operation mode of the quick stroke adjustment
The activation period of the maximum sewing foot stroke depends on the set operation
mode. It is possible to choose between three operation modes.
The individual operation modes are determined by the adjustment of the parameters F-138
and F-184 at the control panel (see enclosed instructions of the motor manufacturer).
Operation mode Operation / Explanation
Keystroke mode
F-138 = off
F-184 = 0
The maximum sewing foot stroke remains
engaged as long as the knee switch 2 is actuated.
Push-lock mode
F-138 = on
The maximum sewing foot stroke is engaged by
actuating the knee switch 2.
By actuating the knee switch once again the
maximum s ewing foot stroke is disengaged.
Keystroke mode
with min. speed
F-138 = off
F-184 > 0
The maximum sewing foot stroke remains
engaged as long as knee switch 2 is actuated.
After releasing the knee switch the machine sews
with maximum sewing foot stroke until the set
minimum s peed is reached (parameter F-184).
Then the seam is continued with normal sewing
foot stroke.
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