20.ADJUSTING THE FEED TIMING(FIG.25)
Fig.25
1. To obtain the standard feed timing align setscrew"A"
on feed eccentric cam① with setscrew"B"on main shaft
thrust collar②.
2. To make adjustment, loosen two setscrews③ to rel-
ease the feed eccentric cam, properly position the ecce-
ntric cam. Then retighten the setscrews.
3. To advance the feed timing in order to prevent uneven
material feed, move the feed eccentric cam in the direction
of the arrow.
4. To delay the feed timing in order to increase stitch
tightness, move the feed eccentric cam in
the opposit direction for the arrow.
5. Be careful not to move the feed eccentric cam too far, or elae needle breakage may result.
21 TILT THE FEED DOG(FIG.26.1)
Fig.26
1. The standard tilt(horizontal)of the feed dog is obtained
when marker dot"A" on the feed bar shaft is aligned with
marker dot"B" on feed rocker①.
2. To tilt the feed dog with its front up in order to prevent
puckering , loosen the setscrew , and turn the feed bar
shaft 90 degrees in the direction of the arrow. Using a
screw driver.
3. To tilt the feed dog with its front down in order to prevent
uneven material feed, turn the feed bar shaft 90 degrees in
the opposite direction from the arrow.
Precaution:
Whenever the feed dog tilt is adjusted , the feed dog
height will be changed. So, it is necessary to check the
feed dog height after tilt adjustment.
A: Front up B:Standard C: Front down D: Throat plate
A
B
Stand feed timing
Delayed feed timing
Advanced feed timing
①
②
③
A
①
6
31
22 HEIGHT OF THE FEED DOG(FIG.27)
1. The feed dog is factory-adjusted so that it just out
from the throat plate 0.75 to 0.85mm. For the heavy
weight material, it just out 1.15 to1.25mm.
2. To adjust the height of the feed dog:
①Loosen screw② of crank①
②Move the feed bar up or down to make adjust-
ment.
③Securely tighten wcrew②.
Fig.27
①
②
Middle thick material: 1.15-1.25mm
Light middle material: 0.75-0.85mm
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