Brother S-7300A, Руководство по обслуживанию

Страница: 149 / 196

7. ADJUSTMENTS
S-7300A
138
7-11. Adjusting the rotary hook lubrication amount
CAUTION
Be careful not to touch your fingers or the lubrication amount check sheet against moving parts such as the rotary
hook or the feed mechanism when checking the amount of oil supplied to the rotary hook. If care is not taken, injury
may result.
Use the following procedure to check the amount of oil being supplied to the rotary hook when replacing the rotary hook or
when changing the sewing speed.
<Checking the lubrication amount>
1. Remove the thread from all points from the thread take-up
lever to the needle.
2.
Use the lifting lever to lift the presser foot.
3. Run the machine at the normal sewing speed for
approximately 10 minutes without sewing any material
(following the same start/stop pattern as when actually
sewing).
4.
Place the lubrication amount check sheet (1) to the left of
the rotary hook (2) and hold it there. Then run the sewing
machine at the normal sewing speed for 10 seconds.
(Any type of paper can be used as the lubrication amount
check sheet (1).)
5. Check the amount of oil which has spattered onto the
sheet.
If adjustment is necessary, carry out the following operations
in "Adjusting the lubrication amount".
NOTE:
If the lubrication amount does not match the correct
amount shown in the illustration at left (if the amount of
spattered oil is too much or none at all), turn the adjusting
screw (3) clockwise to fully tighten it, turn it back
counterclockwise by 3 1/2 turns, and then carry out the
following adjustment.
<Adjusting the lubrication amount>
1.
Tilt back the machine head.
2.
Turn the adjusting screw (3) to adjust the lubrication
amount.
・
If the rotary hook adjusting screw (3) is turned
clockwise, the lubrication amount becomes greater.
・ If the rotary hook adjusting screw (3) is turned
counterclockwise, the lubrication amount becomes
smaller.
3.
Check the lubrication amount again according to the
procedure given in "Checking the lubrication amount"
above.
*
Check the lubrication amount again after the sewing
machine has been used for approximately two hours
4.
Check the lubrication amount again after the sewing
machine has been used for approximately two hours.
2303M
2304M
Approx. 25mm
Approx. 70mm
Bed
5 - 10mm
Correct lubrication
amount
Too little
Spattered oil
Too much
0935M
Less oil
More oil
0911D