Method and apparatus for preventing machine damage
AssigneeMAN Roland Druckmaschinen AG
InventorRobert Kersch
Life of this patent
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Abstract
In a web-fed rotary printing machine having a plurality of cylinders rolling on one another, each cylinder is driven by a respective drive motor, and a control device synchronizes the motors to run at the same speed. The control device has stored therein a control program which can be activated in the event of a web break. The control program has an emergency stop ramp which brakes the motors to a standstill by jerked stop, preferably within five revolutions, the program driving the motors along the stop ramp in the event of a web break.
Claims15
Method of preventing machine damage in the event of a web break in a web-fed rotary printing machine comprising a plurality of cylinders which, in a print-on position, roll one on another, said printing machine further comprising a plurality of drive motors for driving said cylinders, wherein each said cylinder is driven by a respective said drive motor, said method comprising
- synchronizing the motors so that they are all driven at the same speed,
- detecting when a web break occurs, and
- braking said drive motors to a standstill within five revolutions by reversing the effective direction of torque produced by the motors when a web break occurs.
Apparatus for preventing machine damage in the event of a web break in a web-fed rotary printing machine having a plurality of cylinders which, in a print-on position, roll one on another, said printing machine further comprising a plurality of drive motors for driving said cylinders, wherein each said cylinder is driven by a respective said drive motor, said apparatus comprising
- a control device for synchronizing the motors so that they are all driven at the same speed, said control device having stored therein a control program which can be activated in the event of a web break, said control program having therein an emergency stop ramp which brakes said motors to a standstill within five revolutions, said program driving said motors along said stop ramp in the event of a web break.
Dependencies are inferred from the claim text.