Replacing And Adjusting Knives - Yamato VFK2560-8 Instruction Manual

6. Adjustments
6.6 Replacing and adjusting knives
Pressure of upper knife:
When the needle is at the highest point and the upper
knife ① is at the extreme left, the presser foot touches the
stitch plate, and the upper knife ① touches the lower knife
② closely.
The standard clearance between the bearing of the knife
holder shank support ③ and the knife holder guide collar
④ is 1.0 ㎜ .
Loosen the screw ⑤ and move the knife holder guide collar
④ to adjust the pressure.
● To increase the pressure, move the collar ④ upward.
● To decr ease the pr essur e, move the c o l la r ④
downward.
Align the front sides of the upper ① and lower ② knives
without touching the upper knife ① to the presser foot.
After check them, fix the knife holder guide collar ④ with
the screw.
Removing:
(1) Loosen the screws ⑤ and ⑥ then remove the upper
knife ① .
(2) Loosen the screw ⑦ then remove the lower knife ② .
Resetting:
(1) Reset the lower knife ② with the screw ⑦ .
(2) Reset the upper knife ① with the screw ⑥ .
See "5.12 Adjusting lapped width of upper fabric" for
engagement of the knives.
(3) Adjust the knife holder guide collar ④ , referring to
above "Pressure of upper knife" .
VFK2560-8
NOTICE
②
Fig. 6-14
⑤
1.0 ㎜
①
③
Fig. 6-15
②
Fig. 6-16
32
①
align front sides
of knives
④
⑥
⑦