Brother International Z-8550A Instruction Manual - English - Page 55

THREAD TENSION, 9-1. Adjusting the thread tension

Get Brother International Z-8550A PDF manuals and user guides View all Brother International Z-8550A manuals
Add to My Manuals
Save this manual to your list of manuals

Page 55 highlights

9. THREAD TENSION 9. THREAD TENSION 9-1. Adjusting the thread tension CAUTION Turn off the power switch before removing or inserting the bobbin case. The machine may operate if the treadle is depressed by mistake, which could result in injury. Good even stitches 0573M Upper thread Lower thread Upper thread tension too weak or lower thread tension too strong 0572M Increase the upper thread tension. Decrease the lower thread tension. 0574M Upper thread tension too strong or lower thread tension too weak Decrease the upper thread tension. Increase the lower thread tension. Becomes weaker Becomes stronger Adjust by turning the adjustment screw (1) until the bobbin case drops gently by its own weight while the thread end coming out of the bobbin case is held. 3471M Becomes weaker Becomes stronger Becomes weaker Becomes stronger After the lower thread tension has been adjusted, adjust the upper thread tension so that a good, even stitch is obtained. 1. Lower the presser foot. 2. Adjust by turning the tension nut (2). 3. After adjusting the upper thread tension, pull the upper thread in the direction of the arrow and check that the rotary disc (3) turns together with the upper thread. * If it does not turn, tighten the pre-tension (4). NOTE: If the tension of the pre-tension (4) is too weak the thread will slip and the rotary disc (3) will not rotate. The pre-tension (4) should be adjusted to as weak a tension as possible while still allowing the rotary disc (3) to rotate smoothly. 3472M 47 Z-8550A, 8560A

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
Z-8550A, 8560A
9. THREAD TENSION
47
9. THREAD TENSION
9-1. Adjusting the thread tension
CAUTION
Turn off the power switch before removing or inserting the bobbin case.
The machine may operate if the treadle is depressed by mistake, which could result in injury.
Good even stitches
Upper thread
Lower thread
Upper thread tension too weak or
lower thread tension too strong
Increase the upper thread tension.
Decrease the lower thread tension.
Upper thread tension too strong
or lower thread tension too weak
Decrease the upper thread tension.
Increase the lower thread tension.
<Lower thread tension>
Adjust by turning the adjustment screw (1) until the bobbin
case drops gently by its own weight while the thread end
coming out of the bobbin case is held.
<Upper thread tension>
After the lower thread tension has been adjusted, adjust the
upper thread tension so that a good, even stitch is obtained.
1. Lower the presser foot.
2. Adjust by turning the tension nut (2).
3. After adjusting the upper thread tension, pull the upper
thread in the direction of the arrow and check that the
rotary disc (3) turns together with the upper thread.
* If it does not turn, tighten the pre-tension (4).
NOTE:
If the tension of the pre-tension (4) is too weak the thread
will slip and the rotary disc (3) will not rotate.
The pre-tension (4) should be adjusted to as weak a
tension as possible while still allowing the rotary disc (3)
to rotate smoothly.
0573M
0574M
0572M
3471M
Becomes
stronger
Becomes
weaker
3472M
Becomes
weaker
Becomes
stronger
Becomes weaker
Becomes stronger