5.7 Sewing-foot stroke
The height of the sewing-foot stroke is set with adjusting wheel 1.
Machines w ithout FA (w ithout Thread Trimmer)
On these machines the speed of rotation is not checked.
Please comply with the note and table below.
Machines w ith FA (w ith Thread Trimmer)
The sewing-foot stroke and stitch rate are interdependent. A potentiometer is linked
mechanically with the adjusting wheel 1. By means of this potentiometer the control unit
detects which foot-stroke has been set and restricts the speed accordingly.
Machines w ith HP 13 - 7 (Speedomat)
The maximum stroke can be activated while sewing is in progress with the knee switch 2.
Like machines with FA, these machines also have a potentiometer.
Adjusting the sew ing-foot stroke
–
Set adjusting wheel 1. Min. , A , B , C , D , E , F , max.
min. = minimum stroke
max. = maximum stroke
NOTE
In order to ensure maximum durability and safety in operation, the maximum stitch rates
given in the table below should not be exceeded.
Stitch-length range Adjusting S ubclass Max. stitch rate
mm wheel item stitches/min
(mm foot stroke)
0 - 6 min. - B -VF-373 / VF-573 3 000
(up to 2 mm) -AE-73 / AE-5-73 2 800
-FAS-473 3 200
-FAS-573 3 200
-all others 3 200 (3 500)
1)
C - D -VF-373 / VF-573 2 500
(2 - 5 mm) -AE 73 / VF-5-73 2 300
-all others 2 700 (3 000)
1)
E - max all 2 000
(5 - 7 mm)
6 - 9 min - max all 2 000
(1 - 7 mm)
1)
On machines with the speedomat HP 13 - 7 the stitch rate may be increased by
about 300 stitches/min to the figures in brackets.
The HP 13 - 7 is described in detail on page 36.
17
GB
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