Adjustment Of Feed Mechanisms - JUKI MS-3580 Serie Manual De Instrucciones

7. Adjustment of feed mechanisms

WARNING :
Perform the work after turning OFF the power to prevent accidents caused by the abrupt start of the
sewing machine.
(1) Adjustment of stitch length (standard: 8 stitches/inch interval))
With differential feed
Without differential feed
(2) Adjustment of differential feed amount
Front-rear direction
1
3
5
1
2
Vertical
direction
4
1
9
6
− 18 −
The stitch length can be adjusted within the range of 2.1 to
3.6 mm. Standard adjustment is 3.2 mm.
For the adjustment of the stitch length, loosen the lever
setscrew 2 and move the lever upwards or downwards
until the required length is secured.
If the stitch length has been changed,
check "$-7. Adjustment of rear needle
guard" and make a proper readjustment.
Set the stitch length within the range of 2.1
to 3.6 mm. If the stitch length is set to 3.6
mm or more, Do not set the stitch length to
3.6 mm or more since the interference of
components may be caused.
When the stitch length adjusting window screw 1 is
removed, the lever setscrew 2 can be seen.
™ Loosen the lever setscrew 2 to move the lever
upwards and fasten the lever setscrew 2 there.
This action increases the stitch length.
™ Loosen the lever setscrew 2 to move the lever
downwards and fasten the lever setscrew 2
there. This action decreases the stitch length.
1. No graduation is available for the adjust-
ment of the stitch length.
2. When the stitch length is changed
If the forward or backward movement of
the main feed dog is changed, the con-
tact amount is also changed between
each needle and the rear needle holder.
Since this can be a cause of stitch skipping,
the rear needle holder should be readjusted.
In the case misalignment between the right and left
materials occurs during sewing, adjust so that they are
sewn with properly aligned by means of differential feed
adjusting lever 3 .
Scale plate 4 has markings numbered from 1 to 9. When
differential feed adjusting lever 3 is set at the marking 5,
the differential feed ratio of the differential feed amount
to the main feed amount is 1:1. Turn the adjusting lever
toward the marking 1 to decrease the differential feed
amount or toward the marking 9 to increase it.
No differential function is provided to the
mechanism without differential feed.
™ In the case the right material is fed faster than the
left one
Turn differential feed adjusting lever 3 toward
markings 1 to 4 to adjust the misalignment
between the right and left materials.
™ In the case the right material is fed slower than
the left one
Turn differential feed adjusting lever 3 toward
markings 6 to 9 to adjust the misalignment
between the right and left materials.
When fi xing the differential feed adjusting lever 3 ,
※
pinch it with two setscrews 5 and 6 .