EBS Ink-Jet Systems 1500 Series, Руководство пользователя, Страница: 78 / 111

EBS-1500
Series Printers User's Manual
Paragraph 4 - Operating the Printer
EBS
Ink Jet Systems
76
20060920#3.1
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The parameter Resol.dot/dcm , which defines an image resolution. The resolution is given
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.
NOTE:
For print parameters Resol.dot/dcm and Cnv spd m/min extreme setting ranges are
specified. Settings are adjusted by the control program on an on-going basis and may be
limited with settings that are made for other print parameters. The system is protected
automatically against an excessive print rate setting. Therefore some settings may not be
accepted.
Below you can see a sample overprint " ABCD " that differs for various settings of the
Resol.dot/dcm parameter; the 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
Rough measurements of the timing frequency (print rate) can be taken with the
ROWS SPEED command in the PRINTING menu. The value depends on setting of the print
parameters Generator , Resol.dot/dcm and Cnv spd m/min in the PRINTING menu.
4.6.2. Shaft-encoder
The shaft-encoder is an electromechanical indicator of rotary speed. The shaft-encoder
axle is coupled mechanically with an object that moves, for example, on a conveyor. Pulses
are generated at the shaft-encoder output. The pulse frequency is proportional to the
rotational speed of the axle. The pulses determine when rows of overprints are to be printed.
The pulse frequency depends on the following:
a). Conveyor travel speed,
b). Transmission ratio of a mechanical gear between the object moving and shaft-encoder
axle,
c). Encoder type i.e. number of pulses generated during one rotation.
Therefore the external encoders are used to time conveyors whose travel speed varies or is
unstable.
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