InoTec SCAMAX 2600, Руководство по обслуживанию

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SCAMAX
®
2600/4000
Tech. Manual 06/2002 T-35
3.6 Ultrasound Double-feed Detector
The ultrasound double-feed detector recognizes two or more sheets of paper being fed simultaneously. It
stops the scanner or issues an error message.
It is located to the left of the initial feed rollers.
The system consists of:
one ultrasound transmitter
one ultrasound receiver
one control board
The principle of operation is as follows:
As the paper is pulled into the scanner it passes between the ultrasound transmitter and receiver.
The transmitter and receiver are aligned on a level that forms an angle of 60° to the paper level. The gap
between transmitter and receiver is 40 mm. Paper passes trough the unit at a distance of about 7 mm
from the transmitter.
The ultrasound transmitter generates ultrasound waves (>20 kHz) that travel through the paper and are
received by the ultrasound sensor. The control board measures the resulting reduction in amplitude.
IMPORTANT: it is the recognition of air-paper divisions that matters, not the thickness of the
paper!
An error message is displayed on the monitor of the scan PC depending on the user software employed.
The
ultrasound double-feed detector is active when the paper separation is on . Turning the paper
separation off also deactivates the ultrasound double-feed detection.
A push button is located at the left of the SCAMAX 2600/4000 feeder front panel. Ultrasound double-feed
detection is turned off as long as this button is pushed yet paper separation remains active.
Empfänger
Sender
Papier