Paper and Print Industry turns to Rexroth

01 October 2007

Rexroth claims it has found increasing demand for its IndraDrive with ‘Safety on Board’ in the high-output printing and paper converting industry.

Manufacturers of these machines are turning to Rexroth in a bid to enhance operator safety and process reliability, while cutting costs.

With integrated safety, the new generation of drives are certified to EN 954-1 Category 3 and offer response times of 2 milliseconds.

With printing and paper converting machinery, there are often situations during operation when the machine operator has to work directly on the machine. This is essential, for example, when changing plates, blankets or tools, cleaning cylinders, webbing up or removing a paper jam. To avoid the risk of accidents in these situations, the EN 1010-1 to EN 1010-5 standards lay down guidelines and safety requirements for the design and construction of printing and paper converting machines.

These requirements are traditionally satisfied with additional monitoring devices and sensors for speed. They work in parallel with the controlled drives and cut off power to the drive in the event of a hazard. Given the constant rise in machine speeds, however, signal and switching delays mean that these solutions are less and less able to guarantee the required level of personal safety.

With a response time of 2ms, ‘Safety on Board’ offers decentralised safety at the location of the incident. In addition to improved protection for the operator, the safety technology increases the availability of machines since production can be restarted quickly after manual intervention.

Alongside the Safe standstill and Safe operational stop functions with stop categories 0, 1 and 2, it is also now possible to monitor ‘safe movements’ at a reduced speed, limited increment, limited maximum rotational speed or defined direction of rotation in the drive itself.

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