Duerkopp Adler 4220-6, 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 hook post ................................................................................................................................................................ 2
3.1.1 Description
3.1.2 Height setting of the hook
3.1.3 Setting 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 the pin of the thread mechanism
3.2.5 Side setting of the needle bar holder
3.2.6
Setting the needles (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
3.4.4 Setting of the rear and side guides
3.4.5 Setting the guide of the needles (stitch widths with needles, side by side)
3.5 Thread tensioners and limiter ...............................................................................................................................................10
3.5.1 Description
3.5.2 Setting the tension of 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 bootom feed ...........................................................................................................................12
3.6.1 Description
3.6.2 Stitch length mechanism
3.6.2.1 Setting of the horizontal component of the feeder movement
(setting of the upper feeding eccentric)
3.6.2.2 Setting of the vertical component of the feeder movement
3.6.2.3 Setting of the feeder position against the throat plate
3.6.2.4 Setting of the height of the feeder teeth, setting of the feeding balance beam
3.6.2.5 Forward and rearward stitch length distribution (rough)
3.6.2.6 Forward and rearward stitch length distribution (fine)
3.6.2.7 Setting of the control knob (including the stitch length limitation)
3.6.2.8 Feeder replacement
3.7 Feeding mechanism of the top roller ................................................................................................................................16
3.7.1 Description
3.7.2 Feeding clutch
3.7.2.1 Description
3.7.2.2 Setting of the feeding pitch
3.7.2.3 Setting of the lower eccentric
3.7.2.4 Setting the engagement and disengagement of the clutch
3.7.3 Side setting of the indented lower pulley