6.15 Sewing-foot stroke
The special sewing machine 867 has, depending on the subclass, as
standard equipment two setting wheels for the sewing foot stroke.
With the left setting wheel 2 the standard sewing foot stroke from 1 to
9 mm is selected.
With the right setting wheel 1 an increased sewing foot stroke from 1
to 9 mm is selected.
–
Tur ning the setting wheel 1 and 2 (1 to 9)
1 =minimal sewing foot stroke
9 =maximal sewing foot stroke
Automatic limiting of the number of stitches
Machines without thread trimmer
With these machines the s peed is not controlled
Please take into consideration the hint and the chart on the next side.
Machines with thread trimmer
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.
Machines with electro-pneumatic rapid stroke adjustment
With fabric parts that are thicker or in order to sew over cross seams,
the increased sewing foot stroke (setting wheel 1) can be switched on
during the sewing process by actuating the knee switch 3 beneath the
table top. .
As with the machines that are equipped with a thread trimmer, the
potentiometer is also available.
CAUTION Danger of breakage!
The standard sewing foot stroke that is set with the setting wheel 2
may never exceed the stroke set with the setting wheel 1.
53
GB
21
3
Keystone Sewing Machine Company, Inc.
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