General - Duerkopp Adler 271 Service Manual

1. General

This service manual describes the adjustment of the special sewing
machine, classes 271 to 275.
271 single-needle double-lockstitch machine
with skipping underfeed
272 single-needle double-lockstitch machine
with skipping underfeed and needle feed
273 single-needle double-lockstitch machine
with skipping underfeed and intermittent roller overfeed
274 single-needle double-lockstitch machine
with skipping underfeed, needle feed and
intermittent roller overfeed.
275 single-needle double-lockstitch machine
with skipping underfeed and differential foot overfeed
IMPORTANT
The processes described in this manual may only be carried out by
specialist personnel or persons with appropriate training.
Caution: danger of injury
Before all repair, conversion and maintenance work turn off the main
switch and isolate the machine from the pneumatic supply.
When carrying out adjustment work and function-testing with the
machine running, comply with all safety measures and take the utmost
care.
This service manual describes the adjustment of the sewing machine
in a logical order. It must be borne in mind that various adjustments
are mutually dependent. The adjustment process must therefore be
carried out in the order given.
For all adjustments of stitch-forming components a flawless new
needle must be fitted.
When adjusting cutting devices the tools must be replaced.
IMPORTANT
All colour-marked components are factory-set. These settings should
not be altered except by specialists.
3