Electropneumatic Sewing Foot Lift - DURKOPP ADLER 767 Service Instructions Manual

8. Sewing foot height and sewing foot lift
8.1

Electropneumatic sewing foot lift

34
The sewing machine is equipped with a standard electropneumatic
sewing foot lift (FLP).
By pedalling backwards the sewing feet are pneumatically lifted via
cylinder 7 (e.g. for corner sewing).
For lifting the sewing feet the piston rod of cylinder 7 extends.
The motion of the piston rod is transmitted to shaft 4 via lever 3, rod 2
and lever 1.
The pneumatically raised feet should have the following clearance to
the needle plate:
Sewing machines with needle return device
Sewing machines with short thread trimmer
with needle return device
Sewing machines without needle return device
Standard checking
In case of electropneumatically lifted sewing feet:
–
The distance between sewing feet and throat plate should amount
to 16 mm.
The distance should amount 15 mm with sewing machines
equipped with short thread trimmer
In case of lowered sewing feet:
–
Lever 3 must stand horizontally.
–
The distance between lever 3 and the front cast edge 12 must
be 1 mm.
–
Dowel pin 6 must have a distance of approx. 0.5 mm to the end of
the slit in fork lever 5.
ATTENTION !
If the sewing feet are lowered, dowel pin 6 must not abut on
the end of the slit in fork lever 5. Otherwise the dowel pin
prevents that the sewing feet are lowered to the fabric level,
which can lead to feeding problems when sewing thin material.
–
Switch on main switch.
–
Step pedal backwards halfway.
Lift sewing feet.
–
Check distance between lifted sewing feet and throat plate.
–
Lower sewing feet.
The sewing feet must rest on the throat plate.
–
Switch off main switch.
–
Tilt sewing machine back.
–
Check horizontal position of lever 3.
–
Check distance between lever 3 and front cast edge 12.
= 16 mm
= 15 mm
= 8 mm