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Herma uses label detection sensors from Leuze

A Leuze Electronic product story
Edited by the Engineeringtalk editorial team Oct 29, 2009

Herma, a manufacturer of self-adhesive labels and label machinery, has been using sensors from Leuze Electronic to detect, identify and protect personnel in its new warehouse and logistics centre.

To support the newly constructed production hall, a high-bay warehouse for storing material on rolls was built along with conveyor connections to the cutting machines and packaging systems.

Precision positioning of the rolls is achieved using a BPS 34 bar code positioning system that uses optical position determination

Precision positioning of the rolls is achieved using a BPS 34 bar code positioning system that uses optical position determination

Leuze equipped the entire system with sensors that fulfil all of the stipulated requirements, according to Jak Pluder, who is responsible for technology and maintenance at Herma.

In the goods-receiving area, paper and foil rolls are unloaded from trucks and placed on the lifting table by a clamping truck.

There is also a Solid-2E safety light curtain with a protected field height exceeding 2m, as well as a BCL 80 high-speed barcode reader on the ceiling.

Precision positioning of the rolls is achieved using a BPS 34 barcode positioning system that uses optical position determination, which avoids any mechanical wear and slippage issues and removes the need for reference points.

A vertical conveyor then transports the roll to the interior of the goods-receiving hall, where a fully automatic gripper gently places it on a transport system pallet.

This transport system pallet uses 46B series retro-reflective photoelectric sensors to detect presence and exact position and to supply signals to the fire-door control.

Solid-2E safety light curtains are again used for the protection of personnel.

Transport carts, whose position is determined by another BPS 34 barcode positioning system, then transport the rolls to the storage hall, where they are accepted by one of the two high-bay storage cranes.

Here, the DDLS 200 data transmission photoelectric sensor continuously transmits the position data of the high-bay storage crane directly to the control system PLC.

The position of these high-bay cranes is also ascertained using the BPS 34 barcode positioning system.

Another feature at the high-bay storage area is the use of Rotoscan RS4 safety laser scanners to protect maintenance staff if, during the course of maintenance, inspection or repair, they need to enter the 'storage aisle' danger area.

An RS4 laser scanner mounted on the high-bay crane near to the floor level safeguards the traversing area and if a person enters the danger area of a moving crane the system is shut down.

The advantage is that if one high-bay crane is shut down for maintenance, the other crane is able to continue to work, providing that the safety laser scanner does not detect it approaching the maintenance engineer's location, in which case it will also be shut down.

The raw materials required for an order are retrieved from the high-bay storage unit on a 'channel car' and are delivered to the rollout conveyor.

Here, the roll is unpacked and is then taken by the fully automatic transport portal, which was specially developed for Herma.

This portal stores the roll in a buffer or transports it directly to the roll unwinding/winding machine via a distribution car.

At the transport portal/distribution car interface, Leuze's multiple-light-beam safety devices are used to safeguard the access points to the danger areas.

A number of PRK 96 retro-reflective photo-electric sensors control the start/stop function at the transfer station, with reflective foils posing no problems.

The grippers for the rolls are also equipped with retro-reflective photoelectric sensors and BPS positioning systems.

Find out more about this article. Request a brochure, download technical specifications and request samples here.
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