Adjusting The Height Of Thread Retaining Plate A - ELNA E9020 Service Manual

(25) Automatic bobbin winding

(25) - 1 Adjusting the height of thread retaining plate A

• Adjust thread retaining plate A following the procedure of (25) - 2
Adjusting the inclination and the longitudinal position of thread
retaining plate A, temporarily determine the height and fix it.
• Turn the bobbin thread intermediate gear by hand to move thread
retaining plate A in the state that the throat plate and the hook cover
are attached. Then temporarily determine the height of thread
retaining plate A so that it can move from the forward end position
(above the inner hook) to the backward end position.
™ Insert a hexagon wrench key from the frame hole and loosen the
thread retaining plate C setscrew to adjust the height.
Thread retaining plate A
Thread retaining plate
C setscrew
* Adjust the height so that the clearance provided between the upper
plane (rib which is higher) of the bobbin rib and the bottom end of
thread retaining plate A is 0 to 0.2 mm at the forward end position.
Upper plane of bobbin rib
How to adjust
[Checking the working of thread retaining plate A]
After the adjustment, turn the bobbin thread intermediate gear by
hand to check the working of the plate A. Confirm that bobbin winder
driving plate is stretched by the twist of thread retaining plate A with
hook cover, throat plate, inner hook, etc. and thread retaining plate
A does not stop temporarily in the working range of thread retaining
plate A.
Bobbin thread
intermediate gear
Forward end position of
thread retaining plate A
33
Disassembly
Free arm bottom cover and front panel
Location of components to be adjusted
Adjustment drawing
Hexagon wrench
key (2.5 mm)