EFKA DA82GA3312
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The number of start backtacking stitches can be set using the above parameters directly on the V810/V820 control panel.
For fast operator information (HIT) when using the V820 control panel, the value of the function enabled using key 1 can
be displayed for approx. 3 seconds. During this time, the value can be varied directly by pressing key + or -.
6.5.3 Speed Release
Functions Parameter
Delay until speed release after start backtack (t1) 200
Speed release after single and double backtack can be influenced by parameter 200.
6.5.4 Double Start Backtack
The forward section will be sewn for a number of stitches that can be set. Then the stitch regulator signal will be issued and
the backward section will be executed. The number of stitches for the two sections can be set separately.
6.5.5 Single Start Backtack
The stitch regulator signal will be issued and the backward section will be executed for a number of stitches that can be set.
6.6 End Backtack
Functions V810 V820
Single end backtack lefthand arrow above key On Key 2 Key 4
Double end backtack righthand arrow above key On
End backtack Off both arrows Off
The end backtack starts by heelback, in a seam with stitch counting at the end of counting, or, from the light barrier seam at
the end of the light barrier compensating stitches. The stitch regulator is immediately enabled from machine standstill.
After lowering the sewing foot, the switch-on point of the stitch regulator is delayed by the time t3 (start delay after
disabling the sewing foot lift signal). The first leading edge of position 1 counts as 0 stitch whenever the function is not
started in position 1. Counting and disabling the stitch regulator is synchronized to position 1. From full machine run, the
signal will be switched in only after having reached the end backtack speed n4 and synchronization to position 2.
Whether or not an interruption of the start and end backtack is possible can be determined with parameter 284. It does not
work with the ornamental backtack.
Parameter 284 = ON Backtack can be interrupted by pedal position 0 (neutral). A separate speed using parameter
126 is available for this purpose.
Parameter 284 = OFF Automatic backtack cannot be interrupted
By pressing the pedal forward after an interrupted end backtack, the backtack can be continued; by half heelback (-1), the
the sewing foot can be lifted, or, by full heelback (-2), trimming without end backtack can be completed. The sewing foot is
not automatically lifted when interrupting the backtack.
The end backtack stitch length is set with the following parameter:
Parameter 137 = ON Backtack is performed with normal stitch length.
Parameter 137 = OFF Backtack is performed with long stitches.
The stitch length (normal or long stitches) during backtack can be selected with parameter 137. The indicator does not light
up during backtack.
6.6.1 Speed n4 at the Seam End
Functions Parameter
End backtack speed (n4) 113
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