Hook, Needle Bar, Hook Guard And Thread Sluice - Duerkopp Adler N291 Service Manual

2.5 Hook, needle bar, needle guard and thread sluice
Turn off main switch!
Otherwise there is danger of injury!
2.5.1 Hook shaft height
Rule:
The distance between the hook shaft 1 and the
throat plate rest should be 17.7 mm, which can
be checked using the gauge 2.
Check:
– Remove the hook. (See 5.1)
– Align the gauge 2 on the throat plate rest such
that the hook shaft 1 is located in the sleeve of
the gauge 2.
The hook shaft height is correct, when the
gauge rests on the throat plate rest as well as
on the hook shaft.
Correction:
– Remove the plug 18 from the hook holder.
– Loosen the screws 3 at the worm 4.
– Loosen the screw at the adjusting ring 19 and
push the actuation lever 17 of the bobbin brake
to the right until the parts 8, 9, and 10 are
accessible.
– Loosen the screw 7 and remove the circlip 11.
– Remove the ring 10, pressure sleeve 9 with pin
8 and the springs 6.
– To bring the hook shaft to a lower position:
Push the hook shaft all the way down.
Set the top ball bearing 12 until it is dead
against the circlip 13.
To do this, carefully slide the inner ring of the
bottom ball bearing 5 upward using a pin.
– Push the hook shaft all the way up until it rests
against the sleeve of gauge 2.
To do this use a pin.
– Tighten the screws 3 at the worm 4.
– Re-attach all previously removed parts.
Please note:
After a correction adjust the loop stroke and
re-adjust the actuation lever of the bobbin
brake.
16
2.5.2 Distance between the hook and needle
Explanation:
The distance set at our factory using a gauge is
suited for needles up to Nm 140. In the case of
larger-sized needles the distance must also be
greater.
Rule:
In position A of the handwheel (loop stroke
position) the distance between the hook point
and the scarf of the needle that is slightly
deflected by the needle guard should be
0.1 mm.
Check:
Lock the handwheel in position A and check the
distance.
To do this, a white piece of paper may be laid
behind the hook.
Correction:
– Move the needle guard 22 to the rear until the
needle is no longer deflected in the loop stroke
position.
– Insert the adjusting pin 21 or a Nm-120-needle
into the needle bar.
The rest surface of the adjusting pin must be
parallel with the line of feed motion of the
material.
– Unscrew the angle 16.
– Loosen the screws 15 and 20 and shift the
hook drive housing laterally such that the hook
point rests against the adjusting pin or in the
needle scarf.
– Adjust the needle guard such that it slightly
deflects the needle in the loop stroke position.
See subject 2.5.6.