1-44
S-4001 ISBH+I SM 30°
Released: 09/2017
E-mail: [email protected]; webside: amfreece.com
Phone: +420 582 309 146; Fax: +420 582 360 606
E - STANDARD MACHINE ADJUSTMENT
12. LOOPER ADJUSTMENT
Before making the loopers adjustment, follow the below described points:
1. Turn the hand wheel and observe the position of the connecting link
1
at both ends of the looper link arm travel
2
. Angle
A
must equal angle
B
.
2. If incorrect - loosen the hex mounting screw
5
and rotate the eccentric adjusting nut
6
as needed.
3. Tighten the hex mounting screw
5
.
NOTE:
The eccentricity also slightly influences the loopers stroke - see the arrows in the picture below. Check the
marking of the eccentric situated on the back hex nut - while balancing the eccentric on top the stroke is longer, at
bottom it is shorter. Longer stroke means smaller angles (A) and (B), thus the loopers turn more.
4. Turn the hand wheel and bring the needle bar to the upper position.
5. Check the needle is straight; better use a new needle to set the new timing.
6. Tilt the machine head on the rest pin and check if the mark
7
on the looper cam
8
is visible from the front of
the machine (as in the picture). If not, remove the cam and install it correctly.
7. Remove the cover plate, disconnect the main air supply and the tubes from the clamp feet cylinder and remove
the clamping assembly
10
from the machine, remove the throat plate
11
, trimming hook cover and trimming
hook. Dismantle the loopers with holders.