Maintenance and inspection system for a printing machine

• US 6,244,174 B1
• Filed: 07/19/1999
• Issued: 06/12/2001
• Est. Priority Date: 07/18/1998
• Status: Expired due to Fees

• Current Assignee: Manroland AG (Allianz Se)
• Original Assignee: Man Roland Druckmaschinen AG (Allianz Se)
• Inventors: Schmitt-Kallenbach, Martin, Haas, Hanns-Otto, Lindner, Bernd, Sirowitzki, Heiner
• Primary Examiner(s): COLILLA, DANIEL JAMES
• Application Number:
  US09/356,747
• Time in Patent Office: 694 Days
• Field of Search: 101/483, 101/212, 101/181, 101/216, 101/219, 101/484, 340/825.06, 340/825.15, 340/825.18
• US Class Current: 101/212
• CPC Class Codes: B41F 33/0009 Central control units
• CPC Class Codes: B41F 33/12 for starting or stopping the machine as a whole
• CPC Class Codes: G05B 2219/23137 Display program step, instruction number
• CPC Class Codes: G05B 2219/24019 Computer assisted maintenance
• CPC Class Codes: G05B 2219/24106 Display instructions, program statements together with monitored parameter value
• CPC Class Codes: G05B 2219/2646 Printing
• CPC Class Codes: G05B 23/0283 Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL] preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06

Abstract

A maintenance and diagnostic system for a printing machine, preferably a sheet-fed offset printing machine, includes a control system having at least one computer and is connected to signal transmitters that are sensors and/or limit switches. The main drive and other drives of the printing machine are activated via the sensors and/or limit switches. The control system is operatively connected to a control-desk computer containing data on print jobs that are carried out. The control system is arranged to provide a diagnostic and inspection system for printing machines to be used for planning necessary maintenance work in advance to the greatest possible extent such that the downtimes of the printing machine required for maintenance work are minimized. The control system includes a maintenance and inspection computer which is operatively connected to the control system and to the control-desk computer. Signals can be recorded by the control system onto the maintenance and inspection computer. Also, signals sent by the printing machine drives and the signal transmitters are fed to the maintenance and inspection computer. The maintenance and inspection computer uses such signals to determine the condition of consumable materials, and variables representing the stress on and wear of printing machine components provided, and also to determine the times and the extent of appropriate maintenance measures based on such conditions and variables.

Claims

1. A maintenance and diagnostic system for a printing machine comprising:

a control system which includes at least one computer, the control system being connected to signal transmitters that transmit signals of sensors that monitor operating elements of the printing machine and being operative to activate a main drive and auxiliary drives of the printing machine, the control system having an operative connection to a control-desk computer containing data for print jobs carried out;

a maintenance and inspection computer having a signal connection to the control system and to the control-desk computer and receiving the signals recorded by the control system and supplied by the main and auxiliary drives and from the signal transmitters, the maintenance and inspection computer using the signals to determine a condition of consumable materials and variables representing the stress on and wear of printing machine operating elements, and based on such conditions, determining times and extent of printing machine maintenance measures necessary to prevent problems or defective conditions from occurring in the future;

a monitoring unit arranged to receive signals from a rotary encoder fitted to the printing machine, and the monitoring unit having a memory in which positions of the printing machine recorded by the rotary encoder are stored in conjunction with signals which are recorded by the monitoring unit and are received from the printing machine operating elements and the signal transmitters;

wherein

the memory of the monitoring unit stores the positions of the printing machine recorded by the rotary encoder, the signals from the operating elements and the signal transmitters, in conjunction with the time signals from a clock; and

the positions to which the printing machine is to be moved in relation to specific maintenance measures to be carried out, the positions of the operating elements and signal states from the signal transmitters are stored in the memory of the monitoring unit, and when a corresponding maintenance measure is performed, the monitoring unit evaluates and compares the stored signal states with the signals which are currently recorded, in conjunction with the time from the clock.

2. A maintenance and diagnostic system according to claim 1, wherein the maintenance and inspection computer has a signal connection to an additional computer containing print job information about print jobs planned for the printing machine, and the maintenance and inspection computer determines the times and the extent of the maintenance measures based on the print job information.

3. A maintenance and diagnostic system according to claim 1, wherein the maintenance and inspection computer monitors the maintenance measures to be carried out from the signals which are supplied to the control system from the main and auxiliary drives and the signal transmitters.

4. A maintenance and diagnostic system for printing machines according to claim 1, wherein the maintenance and inspection computer records and processes information which is input manually via the control-desk computer and refers to the maintenance measures carried out.

5. A maintenance and diagnostic system according to claim 1, wherein the monitoring unit has a signal connection to the control desk computer of the printing machine so as to receive data from the control desk concerning the conditions recorded therein.

6. A maintenance and diagnostic system according to claim 1, wherein the operations respectively to be performed in relation to a large number of maintenance measures to be carried out are stored in the memory of the monitoring unit, and the operation respectively to be performed is displayed via an indicator device.

7. A maintenance and diagnostics system according to claim 1, wherein the operations respectively to be performed in relation to a large number of maintenance measures to be carried out are stored in the memory of the monitoring unit, and monitoring unit approves an operation based on an operation previously carried out.