Safety device for a printing machine

US5574437A · kind A · utility

Assignee

• MAN Roland Druckmaschinen AG · DE

Inventors

• Klaus Schwinn · Heusenstamm, DE
• Bernd Lindner · Frankfurt, DE
• Reinhold Bischof · Dietzenbach, DE
• Heinz Gotz · Ellwangen (Jagst), DE
• Joachim Deschamps · Neuberg, DE

Key dates

• Filing date: May 31, 1995
• Grant date: Nov 12, 1996
• Expiry date: May 31, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G08B21/02
• WIPO field: Control
• WIPO sector: Instruments

Abstract

This invention describes a monitoring device which monitors the safety of a printing machine. The printing machine has a drive, a control unit arranged upstream of the drive, command buttons which are connected to the control unit and via which the start-up of the printing machine can be initiated, as well as sound generators, connected to the control unit, for the emission of an acoustic alarm signal after the actuation of one of the command buttons initiating the start-up. The monitoring device ensures that a start-up of the printing machine is only carried out if an acoustic alarm signal has previously been properly emitted. This is achieved, according to the invention, by the monitoring device registering the emission of the acoustic alarm signal and, in the event of the alarm signal not being emitted, inhibits the drive of the printing machine from starting up. The monitoring device inhibits the drive via the control unit, disabling the main contactor connected to the drive, applying the brake or switching off the field current via a field contactor.