EBS
Ink Jet Systems
EBS-1500
Series Printers User's Manual
Paragraph 4 - Operating the Printer
20060920#3.1
77
Signal cable
SHAFT-ENCODER axle
Pulses for slow rotation of the SHAFT-ENCODER axle
Pulses for fast rotation of the SHAFT-ENCODER axle
We are not going to describe
types of mechanical gears to be
applied to couple mechanically
encoders with conveyors as there
is a variety of solutions available
to meet specific user
requirements.
Fig. 4.6.2.1.
Shaft-encoder
The timing frequency (print rate) is influenced by two print parameters (see the
PRINTING PARAMETERS
command in the
PRINTING
menu):
´
The
Enc const p/m
(see section
4.4.3.4 Print Parameters
) parameter defines the
number of shaft-encoder pulses that are generated while the objects are covering
a distance of
1m
. If the shaft-encoder is used for timing purposes and the
Enc const p/m
parameters is set to a constant value, no increase or decrease in the conveyor travel
speed has any impact on the width of characters printed.
The
Enc const p/m
parameter can be set with the encoder constant that is measured with
the service command
CONVEYER MEASUREMENTS
- see also section
4.4.4.1 Defining
Some Print Parameters with the Conveyor Travel Speed
.
´
The parameter
Resol.dot/dcm
(see section
4.4.3.4 Print Parameters
), which defines an
image resolution. The resolution is expressed as a number of dots/decimetre. A visual
effect of a change to the parameter is a change in the width of characters (graphic images)
and the length of the entire text file
Below you can see a sample overprint "
ABCD
" that differs for various settings of the
Resol.dot/dcm
parameter; conveyor travel speed is constant (NOTE: in order to make the
overprint legible, it is shown not to scale):
Resol.dot/dcm: 60
Resol.dot/dcm: 30
Resol.dot/dcm: 15
As the printer can not control the frequency of pulses generated by the encoder, the
frequency limit might be exceeded and the overprint might be deformed - see section
6.4 When Problems Arise while Operating or Servicing the Printer
. In order to get correct
overprints, select the timing frequency and settings for the print parameters:
Resol.dot/dcm
,
Enc const p/m
and
Intensity
in such a way that the overprints are not strained.
!