JUKI MS-3580 Serie Manual De Instrucciones página 106

7
3
1
6
!4
!4
!4
!5
5
Groove
1. In the case of front and rear adjustments of the mechanism with differential feed, specifi c atten-
tion should be paid to the fi ne feed dog section of main feed dog 1 .
2. To make front and rear adjustments of the main feed dog 1 , loosen eight setscrews !4 of the cyl-
inder cover and remove the cylinder cover set !5 . After adjustments, mount the cylinder cover set
!5 and tighten the setscrews !4 .
3. For the main feed dog 1 and the differential feed dog 3 , the longitudinal gradients and the hori-
zontality are kept constant and cannot be adjusted.
4. After any adjustment of feed dog ( 1 , 3 ) or this page recheck adjustment of rear needle guard or
[$-7. Adjustment of rear needle guard] and readjust as necessary.
5. When the height of feed dogs 1 , 3 is insuffi cient
™ The amount of feed is decreased and uneven feeding can occur.
™ When the height of the rear needle guide is lowered, this will cause breakage of a needle or
stitch skipping.
6. When the height of feed dogs 1 , 3 is excessive
™ This can be a cause of the materials pushed back to the front side, or of giving rise to feed
fl aws.
™ When the height of the rear needle holder is raised and the margin of the needle contact
position is increased, this will cause failure in producing loops and stitch skipping.
2
9
8
!4
!0
!1
!2
4
− 34 −
(6) Adjustment of main feed dog and
differential feed dog
For the feed rocking lever eccentric pin 4 of the
1)
feed dog, the standard positioning of the groove is
horizontal.
If the groove seems to be inclined deviating from the
standard positioning, loosen the setscrew 5 and
adjust the feed rocking lever eccentric pin 4 of the
feed dog until it assumes its horizontal posture.
Since then, tighten the setscrew 5 .
Mount the main feed dog 1 , differential feed dog 3
2)
and throat plate 2 and fi x the throat plate 2 .
3) In the fi rst place, adjust the height of the main
feed dog 1 to the standard position. Then fi x it by
tightening the setscrew 6 .
Apply the feed dog support 7 to the bottom of the
4)
front section of the main feed dog 1 and tighten the
setscrew 8 .
Then, adjust the height of the differential feed dog 3
5)
to the standard position. After that, fi x it by tightening
the setscrew 9 .
6) According to "#-7. Feed adjustments, (1)
Adjustment of stitch length", adjust the maximum
feed amount of the main feed dog 1 to 3.6mm.
(Apply a ruler to the side of the main feed dog
1 and confi rm the result by turning the pulley
counterclockwise.)
7) Turn the pulley counterclockwise and confi rm that there
is no contact between the main feed dog 1 and the feed
groove front/rear section of the throat plate 2 .
If there is any contact, loosen the setscrew !1 of the
main feed rocking lever link !0 and turn the main feed
rocking eccentric drive stud !2 to adjust the throat
plate 2 not to contact the feed groove front/rear
section. After adjustments, tighten the setscrew !1 .
8) After the adjustment of the amount of forward and
back movement of main feed dog 1 , adjust the feed
amount to the stitch length to be used (for sewing).