Products > Double Sheet Detectors

Double Sheet Detectors

Roland Double Sheet Detectors are required in blank feeders, sheet destackers, robot loaders, blank washers, sheet conveyors, to provide tool and die protection for stamping presses.  Roland Double Metal Detectors for steel, aluminum, or stainless steel blanks are therefore an important precondition for press automation. Single probe double sheet sensors can be mounted directly into vacuum suction cups. Non-contact dual head systems are especially well suited for roll forming application,  mechanical and magnetic transfers.

Single-sided systems                                      Dual head systems


Double Sheet Detection for high tech automation applications  

The double blank control units of the R1000 series were designed with a maximum of common features. They have, e.g. the same interfaces to the PLC and the press controls and an identical control panel. They exhibit the following common features:

  • Digital display of sheet thickness and operating parameter 

  • Memory for 255 double blank parameter sets

  • Monitoring of operating voltage and measurement time

  • Outputs for 0-sheet, 1-sheet, double blank and enable with relay or opto coupler outputs 

  • PLC interface

  • Optional fieldbus interfaces: Profibus, DeviceNet, ControlNet, Interbus or CANopen

  • Optional: Field enclosure (IP65) or front panel mounting



E 20
Applications: Double sheet detection in vacuum destacker, robot loader,
press feeder
Material thickness: Steel: 0.10 - 6.50 mm (with certain restrictions up to 7.50 mm)
(.004 - .250 in.; restricted up to .300in.)
Measuring method: single probe double sheet detection
Functional principle: Electromagnetic double sheet sensor
Programs: 255 measurement programs possible
Special features: Linearized air gap tolerant double sheet sensors
Up to four double sheet sensors of the same type can be connected (Version 4P)
Short measurement cycles











Double blank detection for transfer presses,
Magnetic belt transfer, belt conveyors

Material thickness:

Pair of sensors IS20-30GS /IE20-30GS
Steel: .05 - 4 mm (.002-.160 in.)
Non-ferrous (NF): .05-10 mm (.002-.40 in.)
Austenitic Stainless Steel:
.2 - 10 mm (.008 - .40 in.)
Pair of sensors IS42-30GS /IE42-30GS
Steel: .15 - 8 mm (.006-.325 in.)
Non-ferrous (NF): .1-10 mm (.004-.40 in.)
Austenitic Stainless Steel:
.4 - 10 mm (.016 - .40 in.)

Measuring method: Dual sensor non-contact
Functional principle: Inductive transmission principle
Programs: 255 measurement programs possible
Special features: Double blank detction, suitable for bowed and vibrating sheets.
Large sensor gap up to 80 mm (3.15in.)












UDK 20
Applications: Single probe double sheet detection in vacuum destacker, robot loader.
Suitablefor steel and aluminum.
Material thickness: Steel: up to 4.00 mm (up to .160in.)
Non-ferrous: up to 4.00 mm (up to .160in.) depending on the type of material
Measuring method: single probe double sheet detection
Functional principle: Electromagnet
Eddy current
Programs: 255 measurement programs possible
Special features: Electromagnet and eddy current principles integrated in one sensor









Weld Seam Detectors

Weld seam detection and positioning in tubes with magnetic flux leakage or eddy current sensors is necessary in pipe and tube bending machines, or in hydroforming presses to produce automotive components such as exhaust manifolds, head rests, side members, roll bars, or engine cradles.

The detection and elimination of welds  when processing coils in blanking presses, or cut-to-length lines makes the use of lower cost welded coils possible.

Weld Seam Detection for Tube Bending and Hydroforming

The improvement of the conventional welding methods, the widespread use of the laser welding as well as subsequent treatments e.g. annealing and coating have made the automatic detection of the tube weld seam in many manufacturing processes such as in tube and pipe benders or hydroforming a demanding task for modern sensor technology . This applies both to the weld seam detection in tubes as well as to flat stock e.g. coils. Therefore, the use of special sensors designed for special tasks, digital signal analysis with microprocessor or PC-based control systems have received our special attention.



SND 30
Applications: Weld seam detecting and positioning in tubes in benders and before hydroforming operations
Material thickness: Depending on connected sensor
Measuring method: Depended on connected sensor
Functional principle: Depending on connected sensor
- Magnetic leaking flux
- Laser inside tube sensor
- Pixel based camera system
Programs: 30
Switching threshold: 1
Special features: Teach-In calibration










SND 40
Applications: Weld seam detection in tubes and pipes in tube bender and prior to hydroforming.
Also detection butt welds in coils for the tool protection in front of stamping presses and in slitting lines.
Material thickness: All metals and non-metals tubes and coils
Diameter (tubes): 5 - 500 mm
Diameter (coils): from 100 mm
Wall thickness: depending on the type of the using sensor
Measuring method: Depending on the connected sensor
Functional principle: Depending on the connected sensor:
Magnetic leaking flux
Eddy current
Magnetic leaking flux and eddy current combination
Vision outside sensor
Laser inside sensor
Programs: Unlimited; 30 selectable via PLC
Special features: PC platform under Windows CE.NET®
Teach-In calibration










Cost effective Weld Seam Detectors for 55 Gallon Oil Drums

A good good number of weld seam detection tasks can be solved with simpler systems. This applies specifically to the detection of weld seams in thin-walled metal packaging e.g. 55 gallon oil drums, paint cans, pails and other general line containers or the detection of butt welds in tinplate coils. In such situations it is economically not justifiable to offer technically complex solutions. In many cases this type of machinery process only one or few sheet thicknesses making it uneconomical to use systems with memories for multiple programs or parameter sets. 



Applications: Butt weld location in coils in order to remove weld joints or stitches from the process.
Applications in machines for: screen printing, expansion of bodies, welding of ears, punching rivet holes; completely independent of changing lithographic decorations.
Material thickness: Depending on connected sensor
Measuring method: Single sided non-contact or contact
Functional principle: Magnetic leaking flux and magnet inductive
Programs: 1
Switching threshold: 1











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