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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.
6
5
2
10
7
8
1
5
6
2
9
3
1
3
4
A
5
11
4
Fig. 12
0,5
8
Middle part of
the hook
Fig. 13
Fig. 14
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