Thread Take-Up Amount For Thread Take-Up Spring - Brother T-8422C Instruction Manual

13. STANDARD ADJUSTMENT

13-2. Thread take-up amount for thread take-up spring

< Measurement method >
Trailing thread
65
3014M
Pass upper thread through
thread take-up
3015M
35mm or more
Pull
3016M
T-8421C, 8422C, 8452C, 8722C, 8752C
The standard thread take-up length for thread take-up
springs R (1) and L (2) is 7 mm. You can adjust the thread
take-up amounts by changing the heights of the stopper
[right] (3) and the stopper [left] (4).
* The standard heights of the stopper [right] (3) and the
stopper [left] (4) are when the are aligned with the tension
stud (5).
< Adjustment method >
The thread take-up amount for a thread take-up spring
decreases when the height of the stopper is increased.
Height of stopper [right] (3) [for right thread]
1. Loosen the screw (6), and then slide the stopper [right] (3)
to adjust the thread take-up amount.
2. Tighten the screw (6).
Height of stopper [left] (4) [for left thread]
1. Loosen the screw (7), and then slide the stopper [left] (4)
to adjust the thread take-up amount.
2. Tighten the screw (7).
NOTE:
If using a thread trimming sewing machine, the trailing
length for the left upper thread may become shorter after
thread trimming because of the twist in the thread.
The trailing length is normal if the upper thread length is
35 mm when the thread is pulled from the needle hole. If
the thread length is shorter than this, reduce the thread
take-up amount of the thread take-up spring.
However, if using fine threads (such as #50 polyester
thread or finer), reducing the thread take-up amount too
much may cause the right upper thread to be cut too short,
or it might result in thread trimming errors for the left upper
thread.