CELLO GUARD
Cellophane positioning control on window patched cartons
Extremely friendly to use, it will automatically memorize, through an easy show and go procedure, a
"sample" of good carton and verify, at belt speed in excess of 450 metres/minute, that the cellophane
is correctly positioned. Misplaced positioning, greater than the set tolerance (manufacturer setting
8 mm.) will imply an error signal which will activate the machine stop if the equipment is installed
on its own or eject the carton whenever the Cello Guard is installed together with an
EDI (Error Drive Interface) +
ejector.
Provided with a self diagnosis circuit, it will automatically stop production for any hardware
misfunctioning or improper use and signal the specific reason for the stop on its LCD display.
PERFORMANCES
Scanning speed
|
over 450 metres/minute (machine belt speed)
|
Scanning sensor
|
high resolution laser sensor
|
Carton'synchronism
|
supplied by a separate photocell also employed for the self diagnosis controls
|
Error condition
|
film misplacement greater than the set tolerance
|
Carton's data input
|
automatically acquired during the show and go procedure
|
Reliability
|
ensured by an integrated self diagnosis circuit
|
Machine stop
|
programmable at the attainement of a number of consecutive errors comprised
between 2 and 7 if the equipment is installed together with an "error" monitoring system
(EDI) +
ejector
|
Ejection memory
|
Not available: the Cello Guard, if installed on its own, will stop
the folder gluer at each 1st error. Automatic ejection of wrong cartons will require connection
to an (EDI) +
ejector
|
Any malfunctioning, that could imperil the reliability of the required controls, is
identified by the equipment self-diagnosis circuit which will automatically stop production
and signal, on display, as well as through the optional external lamps, any of the following anomalous
working conditions:
- Encoder (MSD) signal absence: encoder damaged, encoder's wheel
not in contact with the machine belt, encoder's wheel loose from encoder' shaft, cable's connectors
(at either ends) disconnected or shortcircuited, cable cut off or sheared.
- Anomalous cellophane sensor signal: distances between sensor and surface of carton
outside admitted tolerances, sensor damaged, sensor's cable or extension cable disconnected
or cut off.
- Signal absence of cartons detection photocell. This photocell has
the purpose to confirm, to the equipment electronics, the transit of cartons through the machine.
This signal is cross checked with that of the cellophane sensor and for any of these two signals missing
is forseen the alarm for misfunctioning.
- Cellophane error: a window patched carton found with
cellophane misplaced will sets off an acoustic alarm which will result temporized
(short buzz) if the Cello Guard is connected to an error monitoring unit (EDI) or permanent when:
- the Cello Guard is not connected to an error monitoring unit;
- the Cello Guard, although connected to an error monitoring unit, has
attained the number of consecutive errors programmed for production stop.
- Machine running empty: it is case when the Cello Guard receives just
the signal from the turning encoder (MSD) and no cartons are detected by either the photocell or the
cellophane sensor. In case both of these could have been removed, or result contemporarely damaged
(almost impossible coincidence), a reference message on the LCD display, is forseen for this condition
although, of course, not associated to the machine stop. Watch out: should this signalling appear
during production, the operator must stop the machine and verify the reason of the absence of both the
carton's detection photocell and cellophane sensor signals!
- Fault in the equipment hardware (including the self-diagnosis circuit):
the relay, no longer activated by the good working conditions of the electronics, is released.
The release of the relay will stop production. No message on display. Status of signalling lamps, if
installed, unpredictable as they can be on or off in function of the extension of the electronics fault.
Realizzato da DECA s.r.l.
