| Double
Sheet Detector 1 (general for metal sheet working/ processing
machines. Special for canmakers and other thin sheet workers please see Double Sheet Detector 2) |
| For all kind of sheet- destackers,
-feeders, -loaders, -handling robots. Also for yours !  click!
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| Double
Sheet Detectors monitor the the automatic sheet destacking/ sheet feed on sheet working
machines to avoid demages on feeders machines, dies, tools etc. We deliver a wide range of
different models for solving this task : For most kind of sheet materials, sheet
thicknesses, sheet feeders, sheet destackers, robots etc. The double sheet sensors/-
detectors have an signal output that can be used to repeat the sheet feed (shake off the
double sheet) stopp the shett feed process, or to eject the double sheets. Furthermore to
control otical and / or acoustical alarms or other machine operator service calls.
The sensors are fittet in cylindrical enclosures and monitor the sheet as shown here:
1.1.) Singlesided, sheet touching sensors:
Monitoring from the lowerside of sheet:
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Fig. 1 Touchless,
bothsided sensors on a sheet destacking robot (details)
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Fig. 2 Shows an
application with a single sided sensor that monitors the sheet feed on a multi die press (details) More application examples here:
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| Monitoring from the
upper side of sheet: 
Monitoring from the edge of sheet:
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Fig. 3
Singlesided sensors with 2 digital outputs and M12 connectors 
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| 1.2.) Bothsided,
touchless sensors: 
There are sensors available in different technology and dimensions to fit for all kind of
applications.
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Fig. 4 Bothsided
sensors with 2 digital outputs and M12 connectors 
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| 1.3.) Double sheet
sensors for 14 volt supply voltage, M12 connector 1.3.1.) Double sheet sensors with digital output:
These sensors have 2 transistor switching outputs that can be
used to control PLC or IPC digital inputs or also small loads like relays for example.All
functions are integrated in the sensors so that no additionla external switch boxes or
amplifier are needed. The both outputs of the digital sensors switches according to
this table:
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Fig. 5
Singlesided sensors with cable connection for double sheet detectors 
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| Relation
between sheet detection and sensor output for a singlesided digital double sheet sensor: 
The sheet thickness limit value that discriminates one sheet
from double sheet is programmed into the digital sensors by a teach-in process either
during the sensor installation or also later, everytime when necessary.
1.3.2.) Double sheet sensors with analog output
These sensors have a 0 - 10 VDC analog voltage output the
deliver an voltage related to the sheet thickness. They are useful in connection with PLC
/ IPC or simmilar controllers that havbe analog voltage inputs. With this sensors as sheet
thickness value geber in connection with the PLC / IPC process- and / or machine
specificated controllings are possible.
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Fig. 6 Bothsided
sensors with cable connection for double sheet detectors 
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Fig. 7 Amplifier
with 10 - turn sheet thickness limit adjust for external fixing 
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| 1.4.) Double sheet
detectors for 230V or 110V supply voltage, connectin by screw terminals These detectors consist of a sensor (singlesided sheet monitoring) or a
sensor- pair (bothsided sheet monitoring) with fixed cable on the sensor side (standard
length 3m , other length possible on request) and seperate amplifier either in protection
class IP 52 for external fixing on machines or walls or with protection class IP 00 for
internal fixing in cabinets /enclosures.The amplifiers has an change over outputcontact
that switches when the senors has double- / multiple sheets detected. The sheet thickness
limit value for 1 sheet is adjustable either on a internal screwdriver operated adjust or
external manual operated dial with scale and fixing lever.
For more details please ask for the double sheet detector
catalog.
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Fig.8 Amplifier
with screwdriver operated sheet thickness limit adjust for internal fixing 
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