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Leading edge detection

Leading edge detection with MultiTask photoelectric sensors is used to optimize object spacing before singulation or induction to the main sorters. The signal from the sensor enable precise control o f the speed of the individual belt segments. The Reflex Array multi-task photoelectric sensor with its light band is used when objects with no clearly defined leading edge have to be detected reliably. Detection works reliably, even for heavy objects such as polybags.

Alternatively, a combination of light grids and high-resolution encoders enable leading edge detection as well as the detection of the footprint and alignment of the objects on the conveyor belt. The duration of light grid interruption and the speed of the belt measured by the encoder provide additional information about the length of the objects.

  • Following product families can be used
    Product family Reflex Array
    The photoelectric sensor with the 2D light array: multifaceted and economical
    • RAY10: 25 mm-high light array, detects objects ≥ 5 mm
    • RAY26: 55 mm-high light array, three variants, detects objects ≥ 3 mm, ≥ 5 mm or ≥ 10 mm
    • Display for predictive maintenance on the sensor; transmits maintenance signals to the PLC via IO-Link
    • Conveyor belt suppression for RAY26
    Product family HLG
    High-resolution and high-speed detection of the smallest objects
    • 2 mm resolution
    • Response time 3 ms
    • Detection height 50 mm
    • Cable synchronization
    • PNP or NPN with Q or Qnot outputs (NO/NC)
    • 1 x test, 1 x teach-in input
    • M12 male connector, 8-pin
    Product family MLG-2
    Flexible in use for length, width and height measurements
    • Beam separation: 2.5 mm, 5 mm, 10 mm, 20 mm, 25 mm, 30 mm, 50 mm
    • Operating range: 12 m
    • Functions: Cross beam measurement, 4 x zone measurement, high-speed scan, transparent mode
    • Interfaces: PNP, analog, RS485, IO-Link, PROFINET, PROFIBUS, EtherCAT®, EtherNet/IPTM, CANopen
    • Sun resistance mode with reliable switching threshold
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