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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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