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45
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Adjustment Procedure
Results of Improper Adjustment
Checking items:
❶
Tension release actuating bracket
❷
Setscrew
❸
Thread tension adj. knob
❹
Release cam
❺
Roll hemming thread tension releasing body
❻
Setscrew
❼
Knee lifting lever adjustment shaft
❽
Nuts
* Lift the presser foot. Set the thread tension adjustment knob at "4". At
this time, check that the lower looper thread tension is released.
* Check to make sure that a clearance between the lower looper thread
tension disks and that between the roll hemming thread tension disks (the
clearance between two disks) are 0.9 mm or more.
* Check to make sure that the clearance between the lower looper thread
tension disks is 0.9 mm or more when lifting the presser foot with the
knee lifting lever.
How to perform adjustment:
Thread tension controller
○
Loosen the setscrew
❷
of the tension release actuating bracket
❶
.
○
Move the tension release actuating bracket
❶
left or right to perform
adjustment.
○
Tighten the setscrew
❷
.
Roll hemming thread tension controller
○
Bring release cam
❹
to its upper position. Raise the presser foot lifter.
○
Loosen setscrew
❻
.
○
Adjust roll hemming tension releasing body
❺
by moving it to the right
and left.
○
Tighten setscrew
❻
.
○
After the adjustment, lower the presser foot lifter, bring the release cam
to its lower position, and conrm that the roll hemming thread tension
disks come in close contact with each other.
(If you nd it dicult to adjust the tension disks so that they come in
close contact with each other, carry out re-adjustment from the adjust-
ment of the thread tension controller.)
Knee lifting lever
○
Lower the presser foot lifter and bring the knee lifting lever to its highest
position.
○
Loosen nut
❽
.
○
Adjust the knee lifting lever by turning knee lifting lever adjustment shaft
❼
.
○
Tighten nut
❽
.
If the releasing amount of the
disks is inadequate, thick thread
cannot pass between them
smoothly.
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