Setting Of The Opening Hook Of The Hook; Dismounting And Mounting Of The Driving Belt - Duerkopp Adler 524 Instructions Manual

13. Setting of the opening hook of the hook (Fig. 12, 13)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation,
wait until the motor stops!
The space between the sides of the middle part of the hook and the middle
part hook holder (7) is forcibly produced during the machine running by means
of the opening hook (8) and the eccentric (6) for an easier passing of the
thread between the middle part of the hook and the holder of the middle part
of the hook (7). This setting is to be done after having set the zero zig-zag
stitch. Set first the opening size, namely the space produced between the
holder of the hook middle part and the groove sides in the middle part of the
hook. Together with this setting proceed to the setting of the opening hook,
namely to the axial clearance taking up between the opening hook nose (8)
and the projection on the hook middle part.
Unscrew first four screws (3) on the cover (9) of the hook box, remove the
cover and withdraw therefrom the lubricating insert. Loosen the screw (1)
which secures the position of the sleeve (5), on which the pin (4) with the
opening hook bears on. Set the bobbin case lifter in such a way, so that there
is 0.8 mm clearance between its nose and the hook medium part and tighten
the screw (1). Loosen at the same time the screw (11) and set the opening
hook in such a way, so that it forms with the projection of the hook middle
part the clearance of 0.5 mm necessary for the thread passage. After having
set the opening hook tighten the screw (11) with the maximum eccentric
turning. This setting is to be done with the removed throat plate. Proceed to
the time setting of the opening hook against the the hook during the running-in phase of
the machine. Loosen two screws (2) on the eccentric (6) and, in turning it a bit on the
bottom shaft, set the opening of the middle part of the hook in such a way, so that it
begins at the moment, before the upper thread starts passing between the groove sides
in the middle part of the hook and the hook holder nose. At the same time check the
correct passage of the upper thread over the maximum hook diameter, when the opening
hook approaches the opening projection for the purpose of opening the passage of the
upper thread around the middle part of the hook. The correctness of this setting can be
best checked in observing the adjusting spring on the tensioner of the upper thread. Be
careful in having free passage of the thread when the adjusting spring has to produce in
this phase only a slight movement. After having set the eccentric, tighten the screws
and proceed to the remounting of the hook box guard including the lubricating insert.
14. Dismounting and mounting of the driving belt (Fig. 14)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
Dismount first the position sensor (A). When there is no marking of the synchronizer position against the hand wheel, mark it. Dismount
the upper belt guard (2) after having unscrewed the screws (1). Remove the V-belt from the hand wheel.After having loosened two screws
(3) shift out the hand wheel with the bearing )4) from the machine arm and from the upper shaft (5). Pull the driving belt (6) through the
hole in the machine arm and around the upper shaft and put it on both belt wheels. Remount the hand wheel on the upper shaft in such
a way, so that the first screw (3) in the direction of the hand wheel rotation, after being tightened, bears on the flat on the upper shaft.
Secure the hand wheel with the second screws (3). Put the V-belt on the hand wheel and proceed to the mounting of the belt guard and
of the position sensor up to the position mark.
Notice!
After having mounted or replaced the driving belt, it is always necessary to proceed to the timing adjustment of the hook. and of the
feeding according to the above paragraphs. When the mounting is not done by any skilled mechanician, then we recomend to remove the
needle from the needle bar before starting the mounting.
2
6 5
10
7
8
1
5
6
2
9
3
1
3
4
A
5
11
Fig. 12
0,5
8
Middle part of
the hook
Fig. 13
Fig. 14
4