Duerkopp Adler 4280-2, Instructions For Service Manual

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CONTENTS:
1. General safety instructions ............................................................................................................................................... 1
2. Introduction .......................................................................................................................................................................... 1
3. Head of the sewing machine .............................................................................................................................................. 2
3. 1 Hook and the hook post ........................................................................................................................................... 2
3.1.1 Description
3.1.2 Height setting of the hook
3.1.3 Setting of the distance of the hook from the needle
3.1.4 Angular setting of the hook (timing)
3.1.5 Protection of the needle and of the hook point
3.1.6 Setting of the bobbin case opener
3.1.7 Setting the regulation of the hook lubrication
3.1.8 Replacement of the hook
3.1.9 Setting the gear
3.1.10 Dismantling of the hook post
3.2 Needle and thread mechanism ................................................................................................................................. 5
3.2.1 Description
3.2.2 To check the handwheel angular adjustment
3.2.3 Height setting of the needle bar
3.2.4 Angular setting of the pin of the thread mechanism
3.2.5 Side setting of the needle bar holder
3.3 Throat plate and its post ......................................................................................................................................... 7
3.3.1 Description
3.3.2 Mounting and removing the throat plate and its insert
3.3.3 Side setting of the throat plate post and setting of the needle bed shifting
3.3.4 Setting the needle (the needle bar holder) in the direction of sewing (fine setting)
3.4 Front and rear guides of needles ............................................................................................................................. 8
3.4.1 Description
3.4.2 Setting the front guide
3.4.3 Setting the rear guide
3.5 Thread tensioners and limiter ................................................................................................................................. 10
3.5.1 Description
3.5.2 Setting the tension of the main and auxiliary tensioners
3.5.3 Setting the tensioning mechanism of the main tensioners
3.5.4 Setting the adapting spring
3.5.5 Setting the thread limiter
3.6 Feeding mechanism of the needle feed and of the lower feed wheel .................................................................... 11
3.6.1 Description
3.6.2 Stitch length mechanism
3.6.2.1 Setting the upper eccentric
3.6.2.2 Setting the prop
3.6.2.3 a Forward and rearward stitch length distribution (rough)
3.6.2.3 b Forward and rearward stitch length distribution (fine)
3.6.2.4 Setting the control knob (including the stitch length limitation)
3.6.3 Setting the needle feed (rough)
3.6.4 Lower feed wheel
3.6.4.1 Feeding clutches
3.6.4.1.1 Description
3.6.4.1.2 Setting the lever of the second step of feeding(angle, position)
3.6.4.1.3 Setting of the lower eccentric
3.6.4.1.4 Setting the engagement and disengagement of the clutches
3.6.4.2 Wheel feeder and its post
3.6.4.2.1 Setting the chain wheel
3.6.4.2.2 Height setting of the feeder and tensioning of the chain
3.6.2.3 Replacement of the feeder
3.6.5 Setting the top roller (pressing force, height)
3.7 Feeding mechanism of the top roller ....................................................................................................................16
3.7.1 Description
3.7.2 Side setting of the indented lower pulley
3.7.3 Side setting of the indented upper pulley