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Brother International LZ2-B856E Instruction Manual - English and Spanish - Page 172

Adjusting the thread trailing length after thread trimming B856E only

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12. STANDARD ADJUSTMENTS 12. STANDARDEINSTELLUNGEN 12. REGLAGES STANDARD 12. AJUSTES ESTANDARES 12-12. Adjusting the thread trailing length after thread trimming (B856E only) e r 5 mm w y q t r 5 mm e 2 - 4 mm B A Seen from direction B A t e ˙Standard position for upper thread feeding device The standard position for the upper thread feeding device is as shown in the illustration. 1. Loosen the set screw q. 2. Turn the base w so that the end of the wire e is at a position 5 mm below the position where the upper thread r passes. 3. Tighten the set screw q. * At this time, keep the end of the wire e 0.5 mm away from surface A of the part where the thread guide t is installed. 4. Loosen the two bolts y. 5. Move the wire e to the left or right so that the end of the wire e is 2 to 4 mm from the top-left edge of the thread guide t. 6. Tighten the bolts y. 0.5 mm Stronger Weaker r w e u Should not touch e Longer r Shorter y q t B A Seen from direction B A t e 0.5 mm ˙Adjusting the upper thread trailing amount The standard upper thread trailing amount after thread trimming varies as shown below depending on the type of thread used. Upper thread Upper thread trailing amount nylon 100D 1 X 3(Z) 50 - 60mm #60 spun 40 - 50mm If adjustment is necessary, adjust the position of the wire e as described below. 1. Loosen the set screw q. 2. Turn the base w to adjust the vertical position of the end of the wire e. • To increase the upper thread trailing amount, raise the position of the wire e without letting it touch the upper thread r. • To decrease the upper thread trailing amount, lower the position of the wire e without letting it touch the thread guide t. 3. After adjusting, tighten the set screw q. * At this time, keep the end of the wire e 0.5 mm away from surface A of the part where the thread guide t is installed. Note: If the tension of the pre-tension y is to strong, it will be more difficult to adjust the upper thread trailing amount. The pre-tension y should be adjusted to as weak a tension as possible while still allowing the rotary disc u to rotate smoothly. * The thread tension will change at this time, so be sure to re-adjust the upper thread tension. (Refer to page 123.) 153 LZ2-B855E,B856E

Section	Page
Go to Instruction Manual Top Page	1
1. NAMES OF MAJOR PARTS	20
2. MACHINE SPECIFICATIONS	22
3. SEWING PATTERN TABLE	26
4. OPTIONAL PARTS	28
5. INSTALLATION	30
5-1. Work Table	31
5-2. Installing the control box	32
5-3. Installing the motor	33
5-4. Installing the oil pan	34
5-5. Installing the machine head	35
5-6. Installing the knee lifter plate (Except-90□)	36
5-7. Adjusting the knee lifter (Except-90□)	36
5-8. Installing the belt	38
5-9. Installing the bobbin winder	39
5-10. Installing the belt cover	40
5-11. Connecting the cords	43
5-11-1. Ground Wire Connections	44
5-11-2. Connecting the harness	45
5-11-3. Connecting the power cord	49
5-11-4. Connecting the automatic presser foot lifter harness (B856E-90 □or option)	50
5-11-5. Connecting the standing pedal harness (option)	51
5-12. Installing the cotton stand	52
5-13. Connecting the connecting rod	52
5-14. Lubrication	53
5-15. Test operation (Operating the treadle)	54
5-15-1. Turning on the power	54
5-15-2. Operating the treadle	57
5-16. Adjusting the treadle	63
6. PREPARATION BEFORE SEWING	65
6-1. Installing the needle	65
6-2. Removing the bobbin case	66
6-3. Winding the lower thread	67
6-4. Installing the bobbin case	69
6-5. Threading the upper thread	70
6-6. Adjusting the stitch length	72
6-7. Backtacking	73
6-8. Using the thread wiper (B856E-40□, -90□)	75
7. USING THE OPERATION PANEL	76
7-1. Part names and functions	76
7-2. Pattern setting method	85
7-2-1. Setting the sewing pattern	88
7-2-2. Setting the zigzag width	96
7-2-3. Setting the zigzag base line position	98
7-2-4. Setting the zigzag stop position	102
7-3. Setting the sewing speed	103
7-4. Correction sewing	110
7-5. Using slow start (B856E, B855E/BT only)	111
7-6. Setting start backtacking (B856E, B855E/BT only)	112
7-7. Setting end backtacking (B856E, B855E/BT only)	120
7-8. Setting fixed stitches/name label sewing (B856E, B855E/BT only)	130
8. SEWING	139
8-1. Sewing	140
9.THREAD TENSION	141
9-1. Adjusting the thread tension	141
9-2. Adjusting the presser foot pressure	143
10. CLEANING	144
11. REPLACING PARTS	148
11-1. Fixed knife and movable knife (B856E only)	149
11-2. Gauge parts (presser foot, needle plate and feed dog)	150
11-3. Compression spring (B855E-1 and B856E-□01 only)	153
12. STANDARD ADJUSTMENTS	154
12-1. Adjusting the thread tension spring	155
12-2. Adjusting the presser foot height	157
12-3. Adjusting the feed dog height	158
12-4. Adjusting the feed dog angle	159
12-5. Adjusting the forward/back position of the feed dog	160
12-6. Adjusting the needle and feed mechanism timing	161
12-7. Adjusting the needle bar height	162
12-8. Needle and rotary hook timing	164
12-9. Hook stopper position	164
12-10. Adjusting the synchronizer	168
12-11. Adjusting the rotary hook lubrication amount	170
12-12. Adjusting the thread trailing length after thread trimming (B856E only)	172
12-13. Adjusting the position of the thread trimming cam (B856E only)	176
12-14. Adjusting the tension of the lower thread presser spring (B856E only)	180
12-15. Adjusting the thread wiper (B856E only)	181
12-16. Setting the DIP switches	182
13. REFLECTION PATTERN SWITCH (OPTION)	188
14. DIAL LOCK LEVER (OPTION)	195
15. WHEN USING A NON-STANDARD FEED DOG	196
16. TROUBLESHOOTING	198
16-1. Machine head	198
16-2. Operation panel	201

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LZ2-B855E,B856E

153

12. STANDARD ADJUSTMENTS

12. STANDARDEINSTELLUNGEN

12. REGLAGES STANDARD

12. AJUSTES ESTANDARES

■

Standard position for upper thread feeding device

The standard position for the upper thread feeding device

is as shown in the illustration.

Loosen the set screw

Turn the base

so that the end of the wire

is at a

position 5 mm below the position where the upper

thread

passes.

Tighten the set screw

At this time, keep the end of the wire

0.5 mm

away from surface

of the part where the thread

guide

is installed.

Loosen the two bolts

Move the wire

to the left or right so that the end of

the wire

is 2 to 4 mm from the top-left edge of the

thread guide

Tighten the bolts

■

Adjusting the upper thread trailing amount

The standard upper thread trailing amount after thread

trimming varies as shown below depending on the type

of thread used.

If adjustment is necessary, adjust the position of the wire

as described below.

Loosen the set screw

Turn the base

to adjust the vertical position of the

end of the wire

•

To increase the upper thread trailing amount, raise

the position of the wire

without letting it touch

the upper thread

•

To decrease the upper thread trailing amount, lower

the position of the wire

without letting it touch

the thread guide

After adjusting, tighten the set screw

At this time, keep the end of the wire

0.5 mm

away from surface

of the part where the thread

guide

is installed.

Note:

If the tension of the pre-tension

is to strong, it

will be more difficult to adjust the upper thread trail-

ing amount.

The pre-tension

should be adjusted to as weak a

tension as possible while still allowing the rotary

disc

to rotate smoothly.

The thread tension will change at this time, so

be sure to re-adjust the upper thread tension.

(Refer to page 123.)

Upper thread

Upper thread trailing amount

nylon 100D 1 X 3(Z)

50 - 60mm

#60 spun

40 - 50mm

12-12. Adjusting the thread trailing length after thread trimming (B856E only)

Seen from direction

0.5 mm

5 mm

Stronger

Weaker

Should not touch

Longer

Shorter

Seen from direction

0.5 mm

2 - 4 mm

5 mm