Start/End backtack¶
The start backtack starts by pressing the pedal forward at the beginning of the seam.
Start backtack are executed automatically at speed S03. They cannot be
interrupted. If softstart is running parallel, the respective lower speed is prevailing.
The end backtack starts when pedal full heelback(position -2) at the middle of the seam.
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
T06 (start delay after switching off the sewing foot lift signal)，and machine
start is delayed by the time T01 (start delay after switching on the stitch
regulator).
Stitch optimization¶
Important
Before adjustment, make sure that forward stitch length is the same with backward stitch length use the stitch regulator lever.
The time it takes for stitch regulator move into position, adjust parameter
T01 as the guide of following figure:
Increase T01¶
Decrease T01¶
The time it takes for stitch regulator release into position, adjust parameter
T02 as the guide of following figure:
Increase T02¶
Decrease T02¶
Ornamental backtack¶
Function “Ornamental backtack” is used to ensure perfectly overlapping stitches.
Difference from the standard start backtack:
The drive stops for stitch regulator switching
The stop time can be set
When the function is enabled, the motor will stop at the turning point and wait for the
time set by T11 to ensure that the stitch regulator action or release in
place, then the motor continue running.
Ornamental backtack can be enabled for start backtack or end backtack respectively,
controlled by A20 and A22.
Holding Power of the Stitch Regulator Solenoid¶
The stitch regulator solenoid is engaged by full power. Then the system switches
automatically to partial power in order to reduce the load for the control and the
connected solenoid. Set the duration of full power using parameter T08 and the
partial holding power using parameter O09.
Caution
If the holding power is set too high, the solenoid and the control may be permanently damaged. Please observe the permissible duty cycle of the solenoid and set the appropriate value.
Scheduled Switch Off¶
To reduce heat generation, you can enable the timer switch-off function.
If parameter O10 is set to 1, the maximum time the stitch regulator can keep
switch on is determined by parameter O11.
Quick reference¶
This table summarizes which parameter should be used for backtack:
Parameter |
Authority |
See also |
|---|---|---|
Start Backtack Speed |
Operator |
|
End Backtack Speed |
Operator |
|
Start Ornamental Backtack (SD) |
Operator |
|
End Ornamental Backtack (SD) |
Operator |
|
Switching time: Forward to Reverse |
Technician |
|
Switching time: Forward to Reverse |
Technician |
|
Ornamental Backtack (SD) Delay |
Technician |
|
Speed hold after start backtack |
Technician |
|
Switch-on angle |
Technician |
|
Switch-off angle |
Technician |
|
Scheduled Switch Off |
Technician |
|
Upper limit Switch-on period |
Technician |
|
Max. Speed of 1 stitch |
Technician |
|
Max. Speed of 2 stitch |
Technician |
|
Max. Speed of 3 stitch |
Technician |
|
Stitches Delay until enable the pedal after start backtack |
Technician |
|
Full power duration |
Developer |
|
Duty cycle after full power |
Developer |
Parameter List¶
- S03¶
- -Max
4500
- -Min
50
- -Unit
spm
- -Description
Maximum speed for backtack at the seam start.
- S04¶
- -Max
4500
- -Min
50
- -Unit
spm
- -Description
Maximum speed for backtack at the seam end.
- A20¶
- -Max
1
- -Min
0
- -Unit
–
- -Description
- Motor stops at direction change to ensure perfectly overlapping stitches:0 = Off;1 = On.
- A22¶
- -Max
1
- -Min
0
- -Unit
–
- -Description
- Motor stops at direction change during end backtack to ensure overlapping stitches:0 = Off;1 = On.
- T01¶
- -Max
200
- -Min
1
- -Unit
ms
- -Description
Time required for the reverse feed mechanism to complete the transition from forward to reverse feed upon solenoid switch-on.
- T02¶
- -Max
200
- -Min
1
- -Unit
ms
- -Description
Time required for the reverse feed mechanism to restore from reverse to forward feed upon solenoid switch-off.
- T11¶
- -Max
1000
- -Min
1
- -Unit
ms
- -Description
Stop time at direction change of the individual backtack sections to reach the specified stitch lengths.
- A34¶
- -Max
1
- -Min
0
- -Unit
–
- -Description
- Maintains constant speed after start backtack for better seam quality, delay the activation of the pedal:0 = Off;1 = On.
- D05¶
- -Max
359
- -Min
0
- -Unit
1°
- -Description
Switch-on angle for stitch regulator in standard start/end backtack
- D06¶
- -Max
359
- -Min
0
- -Unit
1°
- -Description
Switch-on angle for stitch regulator in standard start/end backtack
- O10¶
- -Max
1
- -Min
0
- -Unit
–
- -Description
- Stitch regulator scheduled switch off:0 = Off;1 = On
- O11¶
- -Max
30
- -Min
5
- -Unit
s
- -Description
If the timer function is enabled, this parameter value determines the maximum switch on time of stitch regulator.
- O12¶
- -Max
4500
- -Min
50
- -Unit
spm
- -Description
When the number of stitches for start/end backtack or W seam single section is set to 1, this parameter determines the maximum sewing speed.
- O13¶
- -Max
4500
- -Min
50
- -Unit
spm
- -Description
When the number of stitches for start/end backtack or W seam single section is set to 2, this parameter determines the maximum sewing speed.
- O14¶
- -Max
4500
- -Min
50
- -Unit
spm
- -Description
When the number of stitches for start/end backtack or W seam single section is set to 3, this parameter determines the maximum sewing speed.
- O41¶
- -Max
10
- -Min
0
- -Unit
stitches
- -Description
After start backtack, it is possible to delay the activation of the pedal, in order to maintain the speed at the end of backtack. This stitches lag can be selected by means of this parameter.
- T08¶
- -Max
999
- -Min
1
- -Unit
ms
- -Description
Stitch regulator: Activation duration in time period t1 (100% duty cycle).
- O09¶
- -Max
100
- -Min
1
- -Unit
%
- -Description
Stitch regulator: Duty cycle [%] in time period t2 .