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13
Stitch length adjustment forwards and in reverse
.05.16
Requirement
At a maximum speed of 400 spm, the stitch length selected on the control panel should not
differ from the actual stitch length when sewing forwards or in reverse.
Thread the machine.
Switch on the machine.
Select the stitch length being used on the control panel.
With parameter 607 limit the maximum speed to 400 spm.
Set parameter 846 at 100.
Place the workpiece under the presser foot.
Sew a seam with at least 20 stitches.
Measure the length of the seam over 20 stitches and calculate the actual stitch length.
If the difference, measured over 20 stitches, is larger than +/- 0.5 mm, the value for
parameter 846 must be corrected.
Take the value for parameter 846 from the table or calculate it with the aid of the formula:
Stitch length 3,0 mm
58.5
59.0
59.5
60.0
60.5
61.0
61.5
62.0
62.5
63.0
63.5
64.0
64.5
65.0
Select the calculated value for parameter 846 and switch off the machine.
Set stitch length
Actual stitch length
Stitch length 2,5 mm
102
48.5
102
49.0
101
49.5
100
50.0
99
50.5
98
51.0
98
51.5
97
52.0
96
52.5
95
53.0
94
53.5
94
54.0
93
54.5
92
The adjustment of the reverse stitch length is carried out as described in the
above work steps under parameter "847", with the reverse feed key pressed,
see Chapter 7.02 Keys on the machine head. More information about selecting
and changing parameters and explanations (functions) of the individual
parameters is contained in Chapter 13.11 Parameter settings.
x 100
Stitch length 2,0 mm
103
38.5
102
39.0
101
39.5
100
40.0
99
40.5
98
41.0
97
41.5
96
42.0
95
42.5
94
43.0
93
43.5
93
92
Adjustment
Stitch length 1,5 mm
104
28.5
105
103
29.0
103
101
29.5
102
100
30.0
100
99
30.5
97
31.0
96
31.5
95
32.0
94
32.5
93
92
13 - 19
98
97
95
94
92
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