-34-
17.
NEEDLE THREADER
USING THE NEEDLE THREADER
There are a wide variety of different needles and sewing
machine threads available. The right ones should be
selected in accordance with the sewing conditions. The
accessory needle threader is designed to make threading
of needles easier, but it cannot handle every single
circumstance of use (combinations of needle and thread)
that may occur. It can be used with some combinations but
not with others, and if it can be used, the pattern may not
be sewn correctly due to the particular sewing conditions.
Do not use the needle threader without gaining a thorough
understanding of how to use it, otherwise the needle
threader may be damaged or needle threading may not be
possible. Be sure to read and understand the following so
that you can handle customer complaints.
NOTE:
1. Needle threader accepts only circled needle and
thread combinations.
2. Combinations marked with a * are not recommended
since they might lead to the breakage of needle
threader imperfect performance.
3. Lower the presser foot when you use needle threader.
4. Nylon transparent thread is applicable in needle
#14-16.
5. Do not turn the balance wheel when using needle
threader.
6. Do not lower the needle threader lever while the
machine is running. If it is lowered, the needle
threader may be broken, rendering it unusable.
Besides this, it may cause the needle to break,
which could result in injury.
7. If a #9 needle is used, the variation in needle
precision may result in the needle being slightly
difficult to thread.
8. Needle should be located above needle plate by
more than 8 mm for threading.
9. Needle threader does not work when you use the
side-cutter.
Thread the needle before attaching the side cutter.
18.
NEEDLE THREADER
(CHECKING THE HOOK POSITION IN HORIZONTAL DIRECTION)
STANDARD
The measure from inside of the hook guard to the center point of hook is 0.42 mm.
CHECK
As sewing needle HA X1 (#14) is standard, so prepare five brand-new sewing needles HA X1 (#14) and check by
changing all of these.
After Checking,
1.
In case that, hook goes through eyelet of all needles .................... There is no problem.
2.
In case that, hook does not go through eyelet of all needles ......... Adjust by bending hook.
3.
In case that, hook does not go through eyelet of some needles.... Needles through which the hook does not go
through are defective.
(Example for checking)
When you check five brand-new sewing needles HA X1 (#9) on condition that it achieves above first case, if the
hook does not go through eyelet of all of these needle, all five needles are defective and you judge the hook position
is not defective.
ADJUSTMENT
In case the hook is defective after above checking, adjust the hook by bending with pliers. Do not bend the hook
guard at this time.
Thread
Needle
#30
#50
#60
#80
#100 #120
#9
×
×
×
O
O
O
#11
×
×
O
O
O
∗
#14
×
O
O
O
∗
∗
#16
∗
O
O
∗
∗
∗
#18
∗
∗
∗
∗
∗
∗
Summary of Contents for BL7800
Page 1: ...4 2001...
Page 4: ...2 1 MECHANICAL CHART...
Page 9: ...7 1 DISASSEMBLING AND REASSEMBLING THE OUTER PARTS AND MAIN PARTS 8 2 LEAD WIRE ARRANGEMENT 19...
Page 15: ...13...
Page 17: ...15...
Page 19: ...17...
Page 21: ...19 2 LEAD WIRE ARRANGEMENT...
Page 43: ...41 Main PC board...
Page 44: ...42 Power supply unit Power 120 Power 230...
Page 45: ...43 Operation board Other PC boards...
Page 46: ...BL7800 T1010141...
