Position switches in printing machines

S970 microswitches are used in position and access control systems on printing machines. They are resistant to aggressive cleaning agents and powder dust.

Microswitch S970

S970 snap-action switches are used in printing and coating units on sheet-fed offset printing machines, for example at Heidelberger Druckmaschinen AG. To dry the printed sheets, a powder dust is used, which is also chemically aggressive.

What tasks do the microswitches perform?

S970 snap-action switches function as position switches in the printing and coating units. They are used to detect the positions of the rollers and their movement state.

The snap-action switches are also used for plant safety, to check the position of the levers that allow the printing machine to be opened. If the operator moves a lever while the machine is running, the snap-action switch is actuated and the controller stops the machine.

Why was the S970 chosen?

The S970 has a polyetherimide housing that is impervious to powder dust. It is also resistant to the particularly aggressive cleaning agents. The S970 is a special version of the S870 snap-action switch with the following features:

  • Compact and robust design, high shock and vibration resistance
  • Positive opening operation of the break contact (VDE approved)
  • Suitable for safety-relevant applications (Machinery Directive, ISO EN 13849)
  • Self-cleaning contacts
  • Protection class up to IP67 with leads

Position and safety switches

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