Head Of The Sewing Machine; Hook And Hook Post - Duerkopp Adler 4181i-3 Instructions For Service Manual

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3. Head of the sewing machine

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3.1 Hook and the hook post
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3.1.1 Description
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The hook (1) is mounted on the shaft (2) and is driven by the gear (3)
from the shaft (4).
The shaft of the hook (2) is mounted on the top in a sliding bearing
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and, on the bottom, in a needle bearing.
The hook is provided with a lever (6) which is tilted when removing the
bobbin (7). The protecting sheet (8) protects against the collision of
the needle with the hook point. The bobbin case opener (9) is driven by
the eccentric (10) on the shaft (2).
The lubricating tube (11), on which a lubricating wick is fastened in the
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tube (12), feeds oil for lubricating the sliding bearing (5) of the eccentric
(10) and the hook path.
The screws (13) serve for taking up the clearance of the gear. The
screws (14) fasten the post to the bedplate.
The lubricating felt (15) is connected by the wick (16) with the lubricating
system and serves for lubricating the gear (3).
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3.1.2 Height setting of the hook
The designated distance „A“ should be 5.3 mm.
Caution! Danger of injury!
Switch off the main switch ! Before starting the setting
operation, wait until the motor stops!
- Loosen both screws (2).
- By turning the screws (3 and 4), set the required distance„A“.
setting up use the setting gauge (7) as per the repective figure.
having set it, tighten carefully the screws.
- By axial shifting of the gear wheel (5), set the axial clearance in
such a way that this clearance is the least possible, but sufficient for
turning easily the hook.
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- Tighten carefully the screws (2). Caution ! One of these screws must
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bear on the flat of the shaft 6).
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3.1.3 Setting the distance of the hook from
the needle
The hook point (1) is set up to the maximum distance of 0.1 mm from
the bottom of the needle recess (2). For the sewing categories 1 and 2,
the needle size 100 is set, for the sewing category 3, the needle size
140 is set.
Caution! Danger of injury!
Switch off the main switch ! Before starting the setting
operation, wait until the motor stops!
- Shift the plate (3).
- Loosen only one screw (4).
- Loosen the screws (5) and tighten them only slightly.
- Loosen the screw (7).
- Shift the hook post (6) at the determined distance between the needle
and the hook point.
- Tighten carefully the screw (4) (be sure not to damage the threads!)
- Tighten duly the screws (5).
- Check up the setting using a narrow strip of thin paper and proceed
to the eventual correction of setting.
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For
After