Electronic safety system for a printing machine
AssigneeHeidelberger Druckmaschinen AG
InventorsAnton Rodi, Hans Muller, Michael Lehnert
Life of this patent
Estimating the term…
Abstract
Safety system for a printing machine having at least one machine drive, a brake device and an electronic control system therefor. The electronic control system has power control stages which permit electronic braking of the drive assembly, and a monitoring circuit, to which can be fed nominal and actual values of the speed of the drive assembly, and which actuate the brake device in the case of impermissibly high deviation between a nominal value and an actual value. Accelerations and decelerations necessary in the operation of the printing machine are achieved by suitable control of the respective machine drive.
Claims10
Safety system for a printing machine comprising at least one machine main drive having nominal and actual speed values;
- at least one main drive brake for braking the main drive;
- a master electronic control including a main brake monitoring circuit connected to said main drive brake for controlling the main drive brake, a main drive electronic circuit responsive to said master electronic control for electronically controlling said actual speed values of the main drive, a tachometer coupled to said main drive for generating said actual speed values, and connected to the master electronic control for transmitting said actual speed values, said master electronic control being responsive to said main brake monitoring circuit for operating the main drive brake in response to an impermissibly high deviation between said nominal and said actual speed values of the main drive;
- further including an opposing spring engaging said main drive brake for applying a braking force to said main drive brake, and an electromagnet connected to said master electronic control, in operative engagement with said main drive brake for applying the main drive brake with the force of said opposing spring, in response to said electromagnet being switched off by said master electronic control, and further including emergency switch means connected to said master electronic control for feeding emergency stop signals in parallel with said main brake monitoring circuit to said main drive electronic circuit for initiating braking action in response to actuation of said emergency switch means.
Dependencies are inferred from the claim text.