Threading The Bobbin Case - Brother LH4-B800E Instruction Manual

7. CORRECT USE

7-4. Threading the bobbin case

Turn off the power switch before removing or inserting the bobbin case, otherwise the machine
may operate if the treadle is depressed by mistake, which could result in injury.
1. Insert the bobbin into the bobbin case. Insert as shown in the illustration.
NOTE:
If the bobbin is inserted back to front, the bobbin will spin freely and the work clamp pulse motor will get
out of step.
2. Pass the thread though the slot (1) and then under the tension spring (2) and through the slot (3). When
sewing whip stitches, pull approximately 40 mm of thread out from the thread hole (4), and when sewing
purl stitches, pull approximately 40 mm or thread out from thread hole (5).
3. Insert the bobbin case into the bottom of the rotary hook.
Stitch patterns
Whip stitch (plain stitch)
Front
1228Q
Whip stitch (plain stitch)
The above stitch pattern in which the upper thread moves over the top and the bottom thread moves over
the bottom of the material in a zigzag pattern is called a "whip" stitch. This pattern is identical to the zigzag
pattern of a lock stitch zigzag machine.
Purl stitch (seal stitch)
The above pattern in which the upper needle thread tension is high and the upper needle follows a straight
line through the seam center while the lower thread moves left to right and intertwines with the upper thread
is called a "purl" stitch.
60
CAUTION
(1)
(5)
(4)
Back
HE-8000
(2)
(3)
Purl stitch Whip stitch
(seal stitch) (plain stitch)
Purl stitch (seal stitch)
Front
1278Q
Back
1229Q