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PF321A6012
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n4. They cannot be interrupted. From full machine run, end backtack / end stitch condensing will be switched in
only after having reached the speed n4 and synchronization to position 2.
7.4.4.1 Speed n4 at the Seam End
Function
with
or
without
control panel
Parameter
End backtack/end stitch condensing speed
End backtack/end stitch condensing speed can be interrupted by pedal in pos. 0
(neutral)
Start and end backtack or stitch condensing can be interrupted by pedal in pos. 0
(neutral) On/Off
(n4)
(n2E)
(StP)
113
163
164
When programming 3-digit or 4-digit parameter values on the control, the 2-digit or 3-digit values displayed must
be multiplied by 10.
7.4.4.2 Stitch Counting for End Backtack/End Stitch Condensing
Function
with
or
without
control panel
Parameter
Number of stitches forward or without stitch regulator
Number of stitches backward or with stitch regulator
Double end backtack repetition
Backtack repetition On/Off
(c3)
(c4)
(wer)
(Fwr)
002
003
091
092
The end backtack/end stitch condensing stitches with or without stitch regulator can be programmed and varied
using the above parameters directly on the control or on a connected V810/V820/V850 control panel.
For fast operator information (HIT) when using the V820/V850 control panel, the value of the function switched
on using key
4
can be displayed for approx. 3 seconds. During this time, the value can be varied directly by
pressing key
+
or
-
.
7.4.4.3 Stitch Correction and Last Stitch Backward
Function
with
or
without
control panel
Parameter
Last stitch backward On/Off
Stitch correction time
(FAr)
(t9)
136
151
The backtack solenoid can be delayed in the double end backtack by selecting a stitch correction time (t9) using
parameter
151
.
For some sewing procedures it is desirable that the backtack solenoid in the single end backtack is disabled
only after trimming. This function can be selected using
parameter
136
.
136 = 0
Trimming stitch backward Off
136 = 1
Trimming stitch backward On with single end backtack
136 = 2
Trimming stitch or positioning stitch always backward at the seam end
7.4.4.4 Double End Backtack/End Stitch Condensing
The backward section and/or end stitch condensing will be executed for a number of stitches that can be set.
Then the stitch regulator will be disabled and the forward section and/or normal stitch condensing stitches will
be executed. The number of stitches for the two sections can be set separately.
After stitch counting (parameter
003
) the trimming function will be initiated. During the entire operation the
sewing speed is reduced to speed n4,. with the exception of the last stitch, which will be performed at
positioning speed n1.
In the case of slow backtack mechanisms it is possible to delay disabling of the stitch regulator in the single and
double end backtack by the time t9 (end backtack stitch correction).
7.4.4.5 Single End Backtack / End Stitch Condensing
The stitch regulator signal will be issued and the backward section and/or end stitch condensing will be
executed for a number of stitches that can be set. During the last stitch the speed is reduced to positioning
speed.
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