Adjustment Of The Thread Trimming Cam Timing - JUKI PS-800SB-2850 Instruction Manual

❸
❶
E
❼
❷
Turn thread trimming cam ❸ in the direction of
arrow until the outer periphery of thread trimming
cam groove C comes in contact with roller ❷ and
stops. At this position, fix thread trimming cam
setscrew ❼ .
OK (F)
❷
C
❷
Illustration as observed from D (right side face)
❹
D
NG (G)
❷
C
❹
C
❸
❸
– 21 –
5) Turn handwheel ❻ by hand in the normal direc-
tion of rotation and press cam follower ❶ to the
left (in the direction of arrow E) with your finger
from under the table to allow roller ❷ to fit and
engage in the groove C of thread trimming cam
❸ .
6) In this state, turn handwheel ❻ in the direction
which is opposite to the normal direction of rota-
tion until handwheel ❻ will go no further. (If the
handwheel is turned further, it reaches the posi-
tion at which cam follower ❶ starts moving.)
At this time, set the QEP value displayed on the
operation panel to 100 ± 10.
4-9-2. Adjustment of the thread trimming cam
timing
1) Loosen the screws No. 2 and No. 1 of thread trim-
ming cam setscrew ❼ from under the table in the
written order.
2) Set the QEP value displayed on the operation
panel to 120 to 130.
4) Pressing cam follower ❶ to the left (in the direc-
tion of arrow E), engage thread trimming cam
❸ with roller ❷ . Then, turn only thread trimming
cam ❸ with fingers in the direction which is op-
posite to the normal direction of rotation of feed
driving shaft ❹ until it will go no further without
turning feed driving shaft ❹ . At this position,
tighten the screws No. 1 and No. 2 of thread trim-
ming cam setscrew ❼ in the written order while
pressing thread trimming cam ❸ against roller ❷
The alignment point between thread
trimming cam ❸ and roller ❷ is
position (F) from which cam follower
❶ starts moving. Position (G) at which
you feel that thread trimming cam ❸
comes in contact with roller ❷ for the
first time during adjustment is not the
correct alignment position.
* Be sure to correct the thread trimming
cam timing carefully since it largely
affects the loop spreading timing.