Efka AB620A5035 - Speed N4 at the Seam End; Stitch Counting for End Backtack;End Stitch Condensing; Stitch Correction and Last Stitch Backward; Double End Backtack;End Stitch Condensing

- AB620A5035
- 29 -
The end backtack/end stitch condensing in a seam with stitch counting starts by heelback 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 switching off the sewing foot lifting signal). The first leading edge of position 1 counts
as 0 stitch whenever the function is not started in position 1. The stitch regulator is synchronized to position 1. End
backtack as well as end stitch condensing are executed automatically at speed 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.
7.5.1 Speed n4 at the Seam End
Function with or without control panel
Parameters
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
7.5.2 Stitch Counting for End Backtack/End Stitch Condensing
Function with or without control panel
Parameters
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 control panel.
For fast operator information (HIT) when using the V820 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 -.
7.5.3 Stitch Correction and Last Stitch Backward
Function with or without control panel
Parameters
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
7.5.4 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).