Fellowes Standard Morgana FRN-6, Руководство по обслуживанию

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R O T A R Y
PAGE 24
S E R V I C E
Section 8 REGISTRATION
8.1 ...... Numbering Registration
The main clutch installed in all machines is an incremental control
unit and contains four wrap springs.
Like all precision components it has to work to a tolerance which is
± ½° and this will allow for a maximum registration error of 1,2mm /
0.048”
Whilst a faulty clutch or an incorrectly adjusted clutch will cause
registration problems, there may be other causes which should be
investigated before dismantling the clutch. Points to check that
will cause registration problems are divided into three sections as
follows :-
8.2 ...... Operational Problems
The feeder should be set so that the paper feeds regularly and
reliably, and the job should have been printed accurately, so feed
paper through twice to ascertain such stock errors and remember
that the machine speed affects the printing position and should not
be adjusted whilst running a job.
Badly curled sheets, poor printing registration, inaccurate paper
cutting and sets with a very wavy lead edge, can cause registration
problems. Again, ignore any problems with such stocks and
ascertain this by numbering flat, well cut stock, twice.
If the numbering head is not fully secured on it's collar, or the
numbering collar is not fully secured to the shaft, registration
errors will occur.
If the nip wheel (on friction machines) or the papergate (on suction
machines) is set too loose, double sheet feeding may result and
cause registration problems.
8.3 ...... Machine Problems
If the twin grip or clutch drive belts are slack, or there is a loose
drive pulley, especially on the main drive shaft, registration errors
are likely to occur.