FLASH DENS

FAG_iCMD
system like number of control patches per ink key zone, trigger mark
configuration, sheet length, etc.
The iCMD controller manages the auto configuration, such as there can be
removed, added, or replaced one single module (Trigger, Reference head, or
densitometer) without the need of external configuration. A simple RESET of the
system will auto-configure the system. The auto configuration functionality is
essential to enable the customer to replace a faulty module by himself. Errors
during configuration can be avoided and the mean time to repair can be reduce.
The iCMD controller collects trigger data, the reference data, and the measurement
data, evaluates the data, applies a patch recognition and reports sheet number,
press speed, cross speed, cross position, and measurement data to the PC.
One iCMD controller unit can handle two FLASH lines, face and back printing
with up to 24 densitometers each.
• The trigger unit finds the measurement position directly on the print without any
angle encoder with an accuracy of 0.1mm on a range of 5xTrigger mark size. This
unit makes the iCMD flexible for the mounting position. The flexibility is essential
for the upgrade business because there are many different types of presses installed
and any press has its optimal measurement position in terms of space, environment
parameters, temperature, wet or dry ink, dust etc. The measurement position on the
sheet on grain can vary absolutely by the sheet length from job to job and ≤ 2mm
during the run of off the press.
The trigger mark can be configured and is part of the control strip over the cross
motion area of the trigger unit.
• The densitometer is a complete unit with 3 ANSI Status I glass interference filters
(430nm, 530nm, 610nm, 20nm width each, black calculated by application of the –
V-lambda curve), with polarisation filter and a 45°/0° geometry. It is conform to
the DIN 16536-2 requirements.
• The reference head is manufactured equal to the Densitometer and has a ceramic
white plaque mounted as measurement patch. It measures the spectral variations of
the flash.
• The FLASH unit illuminates via fiber optics the measurement patch triggered by
the Trigger unit.
• The positioning device is composed by a beam with two suspensions, one driven
by a servo motor, one freewheel and a servo motor control device.
• Mechanical parts for mounting and alignment. The parts are developed and
customized by VIPTONIC and need to guarantee a correct alignment inside the
press. The iCMD modules need to be cleaned, replaced etc. by one single operator.
The system is mechanically fail save.
Status: preliminary 24.07.2003 4 / 4 Lukas Pescoller