ABT20PANEL_I_E_No1_9720342

Instruction Manual 

AUTOMATIC BACK TACKER 

of CONTROL PANEL 

ABT20 

Thank you for purchasing the ABT20. 

Before use, please carefully read through this manual and make sure that you 

thoroughly understand its contents. 

The instruction manual should be placed where it will be easily accessible.

Contents 

1.Check out the following prior to use 1 

2.Description of control panel 1 

3.Screen displays and descriptions 2 

3. 1 Process display screen 2 

3. 2 Parameter settings screen 4 

4.Screen A displays and their descriptions 4 

5.Screen B displays and their descriptions 5 

6.Screen C displays and their descriptions 6 

7.Starting back-tacking (before proceeding) 7 

8.Starting back-tacking 8 

9.Troubleshooting Q & A 9

1. Check out the following prior to use: 

1 Is the air tubes connected properly? 

2 Is the air pressure set to 0.5 Mpa? 

3 Are the wires of the motor box and solenoid valves connected properly? 

2. Description of control panel 

The display screens include the process display 

screen and parameter setting screens (3 types). 

Power lamp 

Screen selector switch 

Sensor 1 lamp 

(CS sensor) 

Sensor 2 lamp 

(Fabric sensor) 

P ○ 

S1 ○ 

S2 ○ 

P switch 

Display 

▲ □ □ T ▲ □ 

P D 

▼ □ □ R ▼ □ 

D switch 

The processes can be selected on the 

process display screen. 

The setting items (parameter numbers) can 

be called on the parameter setting screens. 

(Refer to section 3, 4, 5, 6) 

Use this to return to process 1 

(see section 3). 

The sewing paterns (codes) of the processes 

are set on the process display screen. 

The parameter settings are changed on the 

parameter setting screens. 

(Refer to section 3, 4, 5, 6) 

1

3. Screen displays and descriptions 

3.1 Process display screen 

"1" "2" "3" and "4" 

indicate the processes. 

P ○ 

S1 ○ 

Display 

S2 ○ 

▲ □ □ T ▲ □ 

P 

▼ □ □ R ▼ □ 

D 

Press once. 

1: ABT ON 

OFF 

The current process and sewing pattern are displayed in the first line. 

The next sewing pattern is displayed in the second line. 

Press again. 

2: ABT OFF 

ON 

Press again. 

3: ABT ON 

■ 

In the case of the example at left, the 

following processes are repeated. 

First process ⇒ Backtacking 

Second process ⇒ No backtacking 

Third process ⇒ Backtacking 

Press again. 

4: ABT ■ 

■ 

* Pressing the R switch returns to the 

first process. 

Press once. 

Backtacking at beginning of sewing (ON) 

1: ABT ON 

■ 

Press again. 

No backtacking at beginning of sewing 

(K device stop ・ OFFK) is displayed 

1: ABT OFF‐K 

■ 

Press again. 

No operation 

1: ABT ■ 

■ 

Press again. 

No backtacking at beginning of sewing (OFF) 

1: ABT OFF 

■ 

2

★ Example of process settings 

P ○ 

S1 ○ 

S2 ○ 

▲ □ 

▼ □ 

Display 

□ T ▲ □ 

P 

□ R ▼ □ 

D 

Press once. 

1: ABT ON 

OFF 

1: ABT ON 

■ 

1: ABT OFF‐ K 

■ 

Press again. 

1: ABT ■ 

■ 

Press again. 

The sewing patterns (codes) 

can be selected for each of the 

processes using the D switch. 

1: ABT OFF 

■ 

Press again. 

Press P. 

2: ABT OFF 

ON 

2: ABT ON 

■ 

Press once. 

2: ABT OFF‐ K 

■ 

Press again. 

2: ABT ■ 

■ 

Press again. 

2: ABT OFF 

■ 

Press again. 

6: ABT ■ 

■ 

If this ■ mark is not set after the final process, operation will not 

automatically return to the first process. 

Example: For an operation consisting of first and second processes, 

set the ■ mark for the third process. 

For an operation consisting of five processes, set the ■ 

mark for the sixth process. 

3

3.2 Parameter settings screen 

P ○ 

S1 ○ 

S2 ○ 

▲ □ 

▼ □ 

Display 

P 

□ T ▲ □ 

D 

□ R ▼ □ 

* Pressing the R switch returns to the first process. 

1: ABT ON 

■ 

Screen 1: Process and sewing patterns 

Press T. 

A01 015 STITCH 

CHAIN LENGTH 

Screen A: A01 to A04 

Press T. 

B01 020 TIMER 

MOTOR&K CONTROL 

Screen B: B01 to B14 

Press T. 

C01 000 STITCH 

MESH COUNTER 

Screen C: C01 to C15 

4. Screen A displays and their descriptions 

2 Call the numbers of the 

parameters required. 

P ○ 

S1 ○ 

S2 ○ 

▲ □ 

▼ □ 

Display 

P 

□ T ▲ □ D 

□ R ▼ □ 

3 Use these buttons to 

enter the setting values. 

1: ABT ON 

■ 

1 Call screen A using 

these buttons. 


CLAMP STITCH 

Adjust the strength with which the thread chain is pulled in during backtacking. 

Press P. 


CHAIN LENGTH 

Adjust the length of the thread chain to sew into the seamat beginning of sewing 

using the number of stitches. 

Press P. 

Press P. 

Press P. 


SEW END STITCH 

A04 OFF ON/OFF 

AUTO PF UP 

A05 ON ON/OFF 

KEY LOCK 

Set the number of stitches to be sewn until the machine stops after the fabric 

sensor not detected the material. 

The presser foot automatically rises at the end of sewing, and the machine 

stands by until the next fabric is put in place. (Either ON auto or OFF manual 

can be selected.) 

In order to prevent misoperation, only screens B and C are locked when ON 

is selected. (Either ON or OFF can be selected.) 

4

5. Screen B displays and their descriptions 



P ○ 

S1 ○ 

S2 ○ 

▲ □ 

▼ □ 

Display 

□ T ▲ □ 

P 

□ R ▼ □ 



D 

1: ABT ON 

■ 

1 Call screen B using 

these buttons 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

B01 350 TIMER 

MOTOR&K CONTROL 

B02 070 TIMER 

PF UP TIMER 

B03 070 TIMER 

BLOW DELAY TIMER 

B04 090 TIMER 

SUC. OPEN TIMER 

B05 020 TIMER 

BLOW CHAIN TIMER 

B06 002 STITCH 

FRONT TR STITCH 


REAR TR STITCH 


FRONT TR S.(OFF) 


FRONT TONGUE 


REAR TONGUE 

B11 100 TIMER 

SUC. STOP DELAY 

B12 150 TIMER 

PF 2 DOWN TIMER 


CHAIN CUT STITCH 


FRONT K STITCH 

When sewing is finished, adjust the amount of thread chain remaining around the 

stitch plate tongue. 

When the large amount of thread chain remains around the tongue, reduce the 

setting value. 

Readjustment is necessary when changing the sewing speed. 

When increasing the sewing speed, reduce the setting value. 

Adjust whether the presser foot rises before or after the machine stops. 

(Time adjustment) 

Adjust the wait time until blowing back from K2 starts after the presser foot rises. 


Adjust the time during which the thread chain clamp (right) is open when the 

thread chain is caught. (Time adjustment) 

Note: Set at 50 greater than parameter B05. 

Adjust the time during which the thread chain is blown back from the K2 device. 


Note: Set at 50 smaller than parameter B04. 

Adjust the timing at which the thread at the beginning of sewing is tightened when 

backtacking is used (ABT/ON). 

Note: This timing differs depending on the stitch length and machine speed. 

(Stitch number adjustment) 

Adjust the timing at which the thread is loosened at the end of sewing. 



Adjust the timing at which the thread at the beginning of sewing is tightened when 

performing plain sewing (ABT/OFF). 



Adjust the timing at which the movable middle stitch plate tongue of the stitch 

plate moves forward at the beginning of sewing. (Stitch number adjustment) 



Adjust the timing at which the movable middle stitch plate tongue of the stitch 

plate moves backward at the end of sewing. (Stitch number adjustment) 



Adjust the time during which the suction pipe sucks in the thread chain. (Time 

adjustment) 

Adjust the time until the presser foot moves down after the thread chain is caught. 


Set the number of stitches the thread chain clamp (left) moves to the right so 

that the thread chain with the length for sewing into the seam is cut. 

Adjust the length of time that the K device sucks the thread chain at the beginning 

of sewing when performing plain sewing (ABT/OFF). 



5

6. Screen C displays and their descriptions 



P ○ 

S1 ○ 

S2 ○ 

▲ □ 

▼ □ 

表示 

□ T ▲ □ 

P 

□ R ▼ □ 

D 



1: ABT ON 

■ 

1 Call screen C using 

these buttons. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

C01 6000 RPM 

SEWING SPEED 

C02 6500 RPM 

CHAIN SPEED 

C03 ON ON/OFF 

CHAIN SPEED ON 


MESH COUNTER 

C05 OFF ON/OFF 

REAR BT ON/OFF 


REAR BT START 

Sewing speed 

Chaining off speed 

(Only when parameter C03 has been set to ON) 

Chaining off speed selection 

ON: The machine runs at the speed set using parameter C01. 

OFF: The machine runs at the speed adjusted by the pedal. 

To prevent malfunction of the thread tension releaser,increase the value when 

sewing the mesh or lace material. 

Switching to backtacking at the end of sewing 

ON: Simple backtacking work at the end of sewing 

Number of stitches until the machine stops when backtacking at the end of sewing 

Press P. 

Shown below are the CS (condensed stitch device) option specifications. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 

Press P. 


FRONT CS ON 


FRONT CS START 


FRONT CS LENGTH 


REAR CS ON 


REAR CS START 


REAR CS LENGTH 


MAN. CS LENGTH 

C14 010 TIMER 

PF 1 DOWN TIMER 

C15 010 TIMER 

NEEDLE UP DELAY 

CS ON/OFF at the beginning of sewing 

Number of stitches until CS works at the beginning of sewing 

Number of stitches required by CS at the beginning of sewing 

CS ON/OFF at the end of sewing 

Number of stitches until CS works at the end of sewing 

Number of stitches required by CS at the end of sewing 

Number of stitches required by CS when operated manually 

Time until the presser foot moves down after the fabric has been placed 

underneath it when auto presser foot liftup has been set (valid only when 

parameter A04 has been set to ON) 

Adjust the time until the needle raise the highest point after thread chain blow 

back is completed. (Time adjustment) 

6

7. Starting backtacking 

Before proceeding: 

1 Set the power to ON. (On the motor box display, only the needle up/down lamp lights up. All other lamps are OFF.) 

Needle up/down lamp 

2 Set to OFF (manual) as shown in the figure below. 

P ○ 

S1 ○ 

S2 ○ 

1: ABT OFF 

■ 

▲ □ □ T ▲ □ 

P 

▼ □ □ R ▼ □ 

D 

Use these buttons to 


3 Set the machine speed using parameter C01. 

4 Set the chaining off speed selection to ON using parameter C03. 

5 Set the chaining off speed using parameter C02. ⇒ Set the speed to 5,500 to 6,000 rpm if the machine 

speed (for actual sewing) is less than 5,000 rpm. 

6 Adjust on the stitch length and differential ratio using the 

fabric. 

7 Set to OFFK (manual, K2 air stop) as shown in the figure 

on the right. 

8 Adjust the soft thread chain using the upper thread tension 

spring caps as shown in figure 1 below. 

Note: The thread tension of the thread chain must be re 

adjusted because it differs depending on the type of 

thread used and the sewing speed. 

S1 ○ 

1: ABT OFF‐K 

■ 

▲ □ □ T ▲ □ 

P 

▼ □ □ R ▼ □ 

D 

Use these buttons to 


1 

2 

O 

ON 

Adjust the thread chain condition. 

Adjust the stitch condition 

* This completes the preparations for backtacking. 

7

8. Starting backtacking 

Set ABT ON (auto). 

1 Set the material as far as the position of the upper knife. 

Figure 1 

2 Toe down the pedal and check the backtacking performance as sewing begins. 

Figure 2 

3 If the backtacking performance is unsatisfactory, reinsert the fabric underneath 

the presser foot, and adjust the number of stitches in the parameter A02 setting 

so that, at a low sewing speed, the edge of the fabric moves beyond end A of the 

stitch plate tongue (in the ⇒ direction; refer to figure 2) and then the thread 

chain clamp moves to the right. (See figure 3.) 


CHAIN LENGTH 


CLAMP STITCH 

A 

Note: At the time of shipment, the thread chain length (parameter 

A02) adjustment is set to the fixed type. 

Figure 3 

This moves to 

the right. 

* The steps below describe how to adjust the thread chain 

length. (Requires #000001 air switching valve; purchase it 

separately.) 

3 If the backtacking performance is unsatisfactory, reinsert the fabric underneath 

the presser foot, and adjust the number of stitches in the parameter A02 setting 

so that, at a low sewing speed, the edge of the fabric moves beyond end A of the 

stitch plate tongue (in the ⇒ direction; refer to figure 2) and the thread chain 

clamp (right) opens (thereby releasing the thread chain). (See figure 4.) 

Figure 4 


CHAIN LENGTH 

This opens to 

the right. 

4 Next, adjust the clamp stitch length of the thread chain (the length the thread 

chain is sewn into the seam) using parameter A01. 


CLAMP STITCH 

8

9. Troubleshooting Q&A 

Q A See 

1 

• The thread chain (soft 

chain) condition is 

unsatisfactory. 

• Have any errors been made in the threading? 

• Is the stitch plate or any other part damaged? 

• Is the speed at the end of sewing set to high-speed 

operation? 

(The timer C02 setting must be faster than the C01 

setting.) 

(The timer C03 setting must be ON.) 

Refer to section 7. 

2 

• The thread chain is not 

blown back and caught 

properly. 

• Have the speed controllers been adjusted correctly? 

(Check the speed controllers A, B, C and D again.) 

• Has the K2 device been installed in parallel with the 

stitch plate? 

• Has the K2 device been installed correctly in terms of 

its front-back postion? 

• Increase the operating time for timers B04 and B05. 


Refer to section 10. Refer to 

section 5. 

3 • Defective back-tacking 

• Does the thread chain clamp move toward the right 

too early? 

• Does the stitch plate tongue move forward too early? 

(Timer B09, B10) 

• Adjust the tighten/loose timing of the tension releaser 

for the material. (Timer B06, B07) 

• Check the thread chain condition. 

Refer to section 8. Refer to 

section 6. Refer to section 5. 


* Checking the timers according to the sewing to be performed 

A03 

C02 

C03 

B07 

B10 

C01 

A01 

A02 

B06 

B09 

See section 7. 

See section 7. 

9

4-4-12,NISHITENMA, KITA-KU, OSAKA,JAPAN 

TEL:81-6-6364-1321 FA X:81-6-6364-1307 

〒530- 0047 大阪市北区西天満 4 丁目 4 番 12 号 

TEL( 06)6364-1321( 代 )FAX( 06)6365-5176 

P/N 9720342(I) 

No.1 Edited in 2008.11 

(ABT20 CONTROL PANEL) 

Printed in Japan 2008.11.1HY

ABT20PANEL_I_E_No1_9720342

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