EP0243728B1 - Safety system for a printing machine - Google Patents

Safety system for a printing machine Download PDF

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Publication number
EP0243728B1
EP0243728B1 EP87104965A EP87104965A EP0243728B1 EP 0243728 B1 EP0243728 B1 EP 0243728B1 EP 87104965 A EP87104965 A EP 87104965A EP 87104965 A EP87104965 A EP 87104965A EP 0243728 B1 EP0243728 B1 EP 0243728B1
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EP
European Patent Office
Prior art keywords
safety system
electronic control
control device
monitoring circuit
safety
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP87104965A
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German (de)
French (fr)
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EP0243728A2 (en
EP0243728A3 (en
EP0243728B2 (en
Inventor
Anton Rodi
Hans Müller
Michael Lehnert
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0243728A2 publication Critical patent/EP0243728A2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/04—Tripping devices or stop-motions
    • B41F33/12—Tripping devices or stop-motions for starting or stopping the machine as a whole
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/004—Electric or hydraulic features of drives
    • B41F13/0045—Electric driving devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/41—Means for braking press cylinders

Definitions

  • the invention relates to a security system for a printing press, which is provided with at least one drive and brake device and with an electronic control device.
  • the various drives of a printing press are provided with brakes, in which the braking force is exerted by springs and a corresponding voltage is applied to electromagnets to release or release the brakes.
  • the brakes are used both as service brakes and for emergencies. This leads to undesirable wear on the brakes.
  • emergency stop switches are provided at various points on the printing press and possibly also in the vicinity thereof, with the aid of which the printing press can be stopped. So that the motors can be stopped and the brakes can be applied without electrical auxiliary energy, the known stop devices in known safety devices are each provided with a normally closed contact and connected in series.
  • DE-A 19 43 312 describes a drive for printing rollers in printing presses, in which, in order to achieve a high positioning accuracy in normal printing operation, an electric motor driving the printing roller in cooperation with an electrical control circuit for the motor speed and for the braking of the motor is proportional to one respective number of revolutions are provided. To slow down the motor, switching elements, in particular relays, are arranged in the control circuit, which cause the motor to work as a generator.
  • the drive in addition to the control circuit, is only designed for speed-proportional acceleration and deceleration of printing rollers of a printing press, and that this drive is not suitable for actuating one or more braking devices as a function of defined speed ratios within the framework of a safety system, which provide a quick total - or partial braking in the event of an emergency or emergency situation.
  • the object of the invention is to provide a safety system for a printing press, which enables a defined braking of the moving machine elements depending on the speed of the drive device.
  • the invention consists in that in a safety system for a printing press, which includes at least one drive and brake device for the moving machine parts and an electronic control device with power levels for electrical braking of the drive device, a monitoring circuit is provided in the control device.
  • the monitoring circuit can be supplied with setpoints and actual values of the rotational speed of the drive device and it actuates the braking device if there is an impermissibly high deviation between the setpoint and actual values.
  • the measures according to the invention ensure that the motion sequence of the printing press is controlled purely electrically, so that predetermined delays are also possible.
  • the electromechanical brakes are only required if errors occur in the electronic control device.
  • the braking device is actuated by switching off an electromagnet that releases the brake against a spring force.
  • the braking device is designed in accordance with another development such that the printing press also comes to a standstill can be brought when the drive device applies the highest possible torque.
  • the monitoring circuit sends control signals for stopping the printing press to the power stages before the actuation and checks again the deviation between the setpoint and actual value of the speed.
  • the braking device is checked by actuating the braking device, controlling the driving device for the highest possible torque and evaluating the actual speed value. The check is preferably carried out after the electronic control device is switched on.
  • Another development of the security system according to the invention is characterized in that several emergency switches each have first and second contact pairs which can be operated in parallel, that the first contact pairs are connected in series and form a safety circuit, and that the second contact pairs are individually connected to inputs of the electronic control device.
  • a special embodiment of this development consists in that the safety circuit is supplied with AC line voltage and that the primary winding of a transformer is connected in series with the first contact pairs, the secondary winding of which is connected via a rectifier to the power stages of the monitoring circuit and the computer or computers.
  • This configuration makes it possible to adapt the safety circuit to semiconductor circuits without the voltage supplying the safety circuit being so low that a safe current flow is called into question by the series connection of many contacts.
  • the additional information obtained through the additional contact pairs can be evaluated in various ways.
  • the emergency stop switches are used to bring the entire machine to a standstill as quickly as possible in the event of danger. However, malfunctions are possible which only require the machine to be stopped in successive steps.
  • a main drive 61 and various auxiliary drives, of which only two auxiliary drives 71, 72 are shown, are controlled by two computers 52, 53.
  • the computers 52, 53 are connected to one another and to control electronics 56 with the aid of a bus system 55.
  • a main drive electronics 6 and an auxiliary drive electronics 7 each comprise, in addition to power stages, also associated control stages which, in a system according to the invention, are equipped with microprocessors, among other things.
  • Control electronics 56 has a variety of functions and includes various components. To understand the present invention, however, only the explanation of a monitoring circuit, which is part of the control electronics 56, is required.
  • the monitoring circuit is supplied by a tachometer 9 with the actual value of the machine speed or the speed of the main drive.
  • a setpoint is supplied via the bus system 55.
  • the control electronics supply two contactors (not shown in FIG. 1) with current, so that the electromechanical main drive brake is released.
  • the monitoring circuit in the control electronics 56 sends signals to the main drive electronics 6 when an admissible deviation between the setpoint and actual value is exceeded in order to stop the main drive 61. These signals can result in the ignition pulses of the power stages being blocked and / or the power stages being controlled with electrical braking.
  • the machine quantity will be given a signal emitted by the monitoring circuit for stopping the main drive speed quickly drop due to the electrical braking, so that further measures are not required.
  • the printing press can be stopped by actuating the electromechanical main drive brake 60.
  • the monitoring circuit sends a signal to the ignition pulse lock to the main drive electronics 6 in order to avoid that the main drive 61 continues to be supplied with current - if the defect in the main drive electronics 6 permits this.
  • the monitoring circuit also monitors the function of the computers 52, 53 and can, if one computer fails, transfer security-relevant functions to the other computer.
  • the monitoring circuit monitors the auxiliary drive electronics 7, the auxiliary drives 71, 72 and a braking device 70 assigned to the auxiliary drive 71.
  • an emergency stop signal is triggered by a corresponding device 57, it is sent to the computers 52, 53, to the main drive electronics 6, to the auxiliary drive electronics 7 and to the control electronics 56. If there is no defect in the electronic control device, the printing press is stopped as described above without the aid of the electromechanical brakes. Only when there is a defect that prevents this, the printing machine is stopped using the electromechanical brakes.
  • Fig. 2 shows emergency stop switches 11 to 1 n, which are connected to an electronic control system for a printing press.
  • the latter consists of an input / output unit 4, a computing unit 5 and power units 6, 7, which are assigned to motors 61, 71.
  • the power units essentially correspond to the main drive electronics 6 and the auxiliary drive electronics 7 (FIG. 1).
  • FIG. 1 For the sake of clarity, only two motors, namely the motor 61 of the main drive and a motor 71 of an auxiliary drive, have been shown, although printing presses can have significantly more motors.
  • the design of the electronic control system in detail is possible in a variety of ways without departing from the scope of the invention.
  • the input / output unit 4 comprises two input / output cards 41, 42, each of which has a multiplicity of inputs and outputs 43, 44.
  • the input / output cards 41, 42 are connected to one another and to the input / output control card 51, which contains the monitoring circuit, among other things, of the computing unit via a bus system 45.
  • the computer unit 5 also includes a memory card 54 for storing data, for example data from the printing press and data from the jobs to be processed.
  • a memory card 54 for storing data, for example data from the printing press and data from the jobs to be processed.
  • non-volatile memories are provided on the memory card 54.
  • the programs themselves were stored in read-only memories which are arranged on the cards of the computers 52 and 53.
  • a bus system 55 connects the input / output controller 51, the computers 52, 53 and the memory card 54.
  • the input / output unit 4 is provided for binary signals (for example switches closed, switches open; relays attract, relays drop out), digital signals are output which are used to control the power units 6, 7 and thus of the motors 61, 71 are used via the input / output control 51.
  • the input / output control 51 is also supplied with a signal corresponding to the machine speed by a tachometer 9.
  • An electromagnet 63 for releasing the brake is supplied with operating voltage supplied at 66 via two contacts 64, 65, two contactors 67, 68.
  • the contacts 64, 65 are designed as working contacts, so that the brake is only released when both contacts 64, 65 are closed, which in turn is only the case when both contactors 67, 68 from the input / output unit 4 Voltage are supplied.
  • the emergency switches of which only the emergency switches 11, 12, 13 and 1 are shown for the sake of clarity, can be provided with mushroom push buttons. However, other actuating devices, such as, for example, levers, tread strips and switches, which are actuated when protective guards are opened, can also be provided.
  • Each of the emergency switches 11 to 1 has two contact pairs 21 to 2n, 31 to 3n working as a normally closed contact. The respective first contact pairs 21 to 2n are connected in series and connect a connection 1 provided with mains voltage to the primary winding 81 of a transformer.
  • a rectifier 83 is connected to the secondary winding 82 of the Transforma .
  • the switching voltage is reduced to a value suitable for switching on semiconductor circuits, while the voltage supplying the safety circuit has a sufficiently large value to ensure a safe current flow despite the series connection of many contact pairs.
  • Corresponding inputs of the power units 6, 7, the computer 52, 53 and the input / output controller 51 are connected to the safety circuit via a contactor 84.
  • the respective second contact pairs 31 to 3n of the emergency switches 11 to 1 are connected to inputs of the input / output unit 4 of the electronic control system.
  • the printing press is nevertheless over the safety circuit formed by the respective first contacts 11 to 1 n, the transformer 81, 82, the rectifier 83 and the contactor 84 is stopped.
  • the electromechanical braking device 60 Only when the electronic control device is unable to stop the printing press by electrical braking, is the electromechanical braking device 60 actuated, as described in connection with FIG. 1.
  • the contactors 67, 68 are de-energized, whereby the magnetic coil 63 is separated from the operating voltage supplied at 66 with the aid of the contacts 64, 65. 2, the control of the contactors 67, 68 takes place via the input / output unit 4, but two separate output circuits are provided for the contactors 67, 68 to ensure a high level of security.
  • switches 85, 86 can be connected to inputs of the input / output unit 4. These switches can be used to call up programs which result in a targeted shutdown of the printing press in accordance with the respective situation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Description

Die Erfindung betrifft ein Sicherheitssystem für eine Druckmaschine, die mit mindestens einer Antriebs- und Bremsvorrichtung und mit einer elektronischen Steuereinrichtung versehen ist.The invention relates to a security system for a printing press, which is provided with at least one drive and brake device and with an electronic control device.

Zur Erfüllung sicherheitstechnischer Auflagen sind verschiedene Sicherheitseinrichtungen an Druckmaschinen bekannt. So sind beispielsweise die verschiedenen Antriebe einer Druckmaschine mit Bremsen versehen, bei welchen die Bremskraft von Federn ausgeübt wird und zum Lösen bzw. Lüften der Bremsen Elektromagnete mit einer entsprechenden Spannung beaufschlagt werden.Various safety devices on printing presses are known to meet safety requirements. For example, the various drives of a printing press are provided with brakes, in which the braking force is exerted by springs and a corresponding voltage is applied to electromagnets to release or release the brakes.

Dabei werden bei bekannten Druckmaschinen die Bremsen sowohl als Betriebsbremsen als auch für den Notfall benutzt. Dieses führt zu einer unerwünschten Abnutzung der Bremsen.In known printing machines, the brakes are used both as service brakes and for emergencies. This leads to undesirable wear on the brakes.

Ferner sind an verschiedenen Stellen der Druckmaschine und gegebenenfalls auch in deren Umgebung Not-Aus-Schalter vorgesehen, mit deren Hilfe ein Anhalten der Druckmaschine vorgenommen werden kann. Damit ein Anhalten der Motoren ebenso wie ein Anlegen der Bremsen ohne elektrische Hilfsenergie möglich ist, sind bei bekannten Sicherheitseinrichtungen die Not-Aus-Schalter mit je einem Ruhekontakt versehen und in Reihe geschaltet.Furthermore, emergency stop switches are provided at various points on the printing press and possibly also in the vicinity thereof, with the aid of which the printing press can be stopped. So that the motors can be stopped and the brakes can be applied without electrical auxiliary energy, the known stop devices in known safety devices are each provided with a normally closed contact and connected in series.

In der DE-A 19 43 312 ist ein Antrieb für Druckwalzen in Druckmaschinen beschrieben, bei dem zum Erreichen einer hohen Positioniergenauigkeit im normalen Druckbetrieb ein die Druckwalze antreibender Elektromotor im Zusammenwirken mit einem elektrischen Steuerkreises für die Motordrehzahl und für die Abbremsung des Motors proportional zu einer jeweiligen Umdrehungszahl vorgesehen sind. Zur Abbremsung des Motors sind im Steuerkreis Umschaltelemente insbesondere Relais, angeordnet, die bewirken, daß der Motor als Generator arbeitet.DE-A 19 43 312 describes a drive for printing rollers in printing presses, in which, in order to achieve a high positioning accuracy in normal printing operation, an electric motor driving the printing roller in cooperation with an electrical control circuit for the motor speed and for the braking of the motor is proportional to one respective number of revolutions are provided. To slow down the motor, switching elements, in particular relays, are arranged in the control circuit, which cause the motor to work as a generator.

Nachteilig hierbei ist, daß der Antrieb nebst Steuerkreis lediglich zum drehzahlproportionalen Beschleunigen und Verzögern von Druckwalzen einer Druckmaschine ausgelegt ist, und daß dieser Antrieb nicht geeignet ist, in Abhängigkeit von definierten Drehzahlverhältnissen im Rahmen eines Sicherheitssystems eine oder mehrere Bremsvorrichtungen zu betätigen, die eine schnelle Total- oder Teilabbremsung im Falle einer Not- oder Havariesituation bewirken.The disadvantage here is that the drive, in addition to the control circuit, is only designed for speed-proportional acceleration and deceleration of printing rollers of a printing press, and that this drive is not suitable for actuating one or more braking devices as a function of defined speed ratios within the framework of a safety system, which provide a quick total - or partial braking in the event of an emergency or emergency situation.

Die Aufgabe der Erfindung besteht darin, ein Sicherheitssystem für eine Druckmaschine zu schaffen, das in Abhängigkeit von der Drehzahl der Antriebsvorrichtung eine definierte Abbremsung der bewegten Maschinenelemente ermöglicht.The object of the invention is to provide a safety system for a printing press, which enables a defined braking of the moving machine elements depending on the speed of the drive device.

Die Erfindung besteht darin, daß bei einem Sicherheitssystem für eine Druckmaschine, welches mindestens eine Antriebs- und Bremsvorrichutng für die bewegten Maschinennteile und eine elektronische Steuereinrichtung mit Leistungsstufen zum elektrischen Bremsen der Antriebsvorrichtung beinhaltet, in der Steuereinrichtung eine Überwachungsschaltung vorgesehen ist.The invention consists in that in a safety system for a printing press, which includes at least one drive and brake device for the moving machine parts and an electronic control device with power levels for electrical braking of the drive device, a monitoring circuit is provided in the control device.

Der Überwachungsschaltung sind erfindungsgemäß Soll- und Istwerte der Drehzahl der Antriebsvorrichtung zuführbar und sie betätigt die Bremsvorrichtung, wenn eine unzulässig hohe Abweichung zwischen Soll- und Istwert vorliegt.According to the invention, the monitoring circuit can be supplied with setpoints and actual values of the rotational speed of the drive device and it actuates the braking device if there is an impermissibly high deviation between the setpoint and actual values.

Durch die erfindungsgemäßen Maßnahmen ist gewährleistet, daß die Steuerung des Bewegungsablaufs der Druckmaschine rein elektrisch erfolgt, so daß auch vorgegebene Verzögerungen möglich sind. Dabei werden die elektromechanischen Bremsen nur dann benötigt, wenn in der elektronischen Steuereinrichtung Fehler auftreten.The measures according to the invention ensure that the motion sequence of the printing press is controlled purely electrically, so that predetermined delays are also possible. The electromechanical brakes are only required if errors occur in the electronic control device.

Zur weiteren Sicherheit ist gemäß einer Weiterbildung der Erfindung vorgesehen, daß die Betätigung der Bremsvorrichtung dadurch erfolgt, daß ein die Bremse entgegen einer Federkraft lösender Elektromagnet abgeschaltet wird.For further safety, it is provided according to a further development of the invention that the braking device is actuated by switching off an electromagnet that releases the brake against a spring force.

Um auch dagegen geschützt zu sein, daß die Antriebsvorrichtung nicht zum Stillstand gebracht werden kann, wenn durch einen Fehler, beispielsweise in den Leistungsstufen, das höchstmögliche Drehmoment aufgebracht wird, ist die Bremsvorrichtung gemäß einer anderen Weiterbildung derart ausgelegt, daß die Druckmaschine auch dann zum Stillstand gebracht werden kann, wenn die Antriebsvorrichtung das höchstmögliche Drehmoment aufbringt.In order to also be protected against the fact that the drive device cannot be brought to a standstill if the highest possible torque is applied due to a fault, for example in the power stages, the braking device is designed in accordance with another development such that the printing press also comes to a standstill can be brought when the drive device applies the highest possible torque.

Bei einer Reihe von Defekten in der elektronischen Steuereinrichtung ist selbst bei einer unzulässig hohen Abweichung zwischen Soll- und Istwert keine Betätigung der elektromechanischen Bremsvorrichtung erforderlich, solange die Leistungsstufen und gegebenenfalls mit ihnen verbundene Steuerstufen noch arbeiten. Für solche Fälle ist gemäß einer anderen Weiterbildung vorgesehen, daß die überwachungsschaltung vor der Betätigung Steuersignale zum Stillsetzen der Druckmaschine an die Leistungsstufen abgibt und erneut die Abweichung zwischen Soll -und Istwert der Drehzahl prüft.In the event of a number of defects in the electronic control device, no actuation of the electromechanical braking device is necessary, even in the case of an impermissibly high deviation between the setpoint and actual value, as long as the power levels and any control levels connected to them still work. For such cases, according to another development, it is provided that the monitoring circuit sends control signals for stopping the printing press to the power stages before the actuation and checks again the deviation between the setpoint and actual value of the speed.

Da die elektromechanische Bremsvorrichtung bei dem erfindungsgemäßen System sehr selten benutzt wird, könnte ein trotzdem auftretender Defekt an der Bremsvorrichtung nicht bemerkt werden. Es ist deshalb gemäß einer anderen Weiterbildung vorgesehen, daß durch Betätigung der Bremsvorrichtung, Steuerung der Antriebsvorrichtung auf das höchstmögliche Drehmoment und Auswertung des Drehzahl-Istwertes die Bremsvorrichtung überprüft wird. Dabei erfolgt die überprüfung vorzugsweise nach dem Einschalten der elektronischen Steuereinrichtung.Since the electromechanical braking device is used very rarely in the system according to the invention, a defect in the braking device that occurs anyway could not be noticed. According to another development, it is therefore provided that the braking device is checked by actuating the braking device, controlling the driving device for the highest possible torque and evaluating the actual speed value. The check is preferably carried out after the electronic control device is switched on.

Durch die in den weiteren Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der Erfindung möglich. Besonders vorteilhaft ist es, wenn Not-Aus-Signale parallel der Überwachungsschaltung, den Leistungsstufen und einem Rechner bzw. mehreren Rechnern zuführbar sind.By in the further subclaims Measures listed are advantageous developments and improvements of the invention possible. It is particularly advantageous if emergency stop signals can be fed in parallel to the monitoring circuit, the power stages and one or more computers.

Eine andere Weiterbildung des erfindungsgemäßen Sicherheitssystems ist dadurch gekennzeichnet, daß mehrere Notschalter jeweils parallel betätigbare erste und zweite Kontaktpaare aufweisen, daß die ersten Kontaktpaare in Reihe geschaltet sind und einen Sicherheitsstromkreis bilden und daß die zweiten Kontaktpaare einzeln mit Eingängen der elektronischen Steuereinrichtung verbunden sind.Another development of the security system according to the invention is characterized in that several emergency switches each have first and second contact pairs which can be operated in parallel, that the first contact pairs are connected in series and form a safety circuit, and that the second contact pairs are individually connected to inputs of the electronic control device.

Durch diese Weiterbildung wird eine zusätzliche Sicherheit und die Möglichkeit erreicht, den jeweils ausgelösten oder fehlerhaften Not-Aus-Schalter zu lokalisieren. Dabei bleiben die grundsätzlichen Vorteile der Reihenschaltung sämtlicher Not-Aus-Schalter erhalten. Insbesondere kann eine Not-Aus-Abschaltung nicht deshalb unterbleiben, weil eine für die Weitergabe eines Not-Aus-Signals erforderliche Spannungsquelle nicht vorhanden ist.This further development provides additional security and the possibility of localizing the triggered or faulty emergency stop switch. The basic advantages of connecting all emergency stop switches in series are retained. In particular, an emergency stop cannot be omitted because there is no voltage source required for the transmission of an emergency stop signal.

Eine besondere Ausgestaltung dieser Weiterbildung besteht darin, daß der Sicherheitsstromkreis mit Netzwechselspannung gespeist ist und daß in Reihe mit den ersten Kontaktpaaren die Primärwicklung eines Transformators geschaltet ist, dessen Sekundärwicklung über einen Gleichrichter mit den Leistungsstufen der Überwachungsschaltung und dem Rechner bzw. den Rechnern verbunden ist.A special embodiment of this development consists in that the safety circuit is supplied with AC line voltage and that the primary winding of a transformer is connected in series with the first contact pairs, the secondary winding of which is connected via a rectifier to the power stages of the monitoring circuit and the computer or computers.

Durch diese Ausgestaltung ist eine Anpassung des Sicherheitsstromkreises an Halbleiterschaltungen möglich, ohne daß die den Sicherheitsstromkreis versorgende Spannung so niedrig ist, daß durch die Reihenschaltung vieler Kontakte ein sicherer Stromfluß in Frage gestellt ist.This configuration makes it possible to adapt the safety circuit to semiconductor circuits without the voltage supplying the safety circuit being so low that a safe current flow is called into question by the series connection of many contacts.

Die durch die zusätzlichen Kontaktpaare gewonnenen zusätzlichen Informationen können in verschiedenster Weise ausgewertet werden.The additional information obtained through the additional contact pairs can be evaluated in various ways.

Die Not-Aus-Schalter dienen dazu, im Falle einer Gefahr, die gesamte Maschine möglichst schnell zum Stehen zu bringen. Es sind jedoch Störungen möglich, welche lediglich ein Stillsetzen der Maschine in aufeinanderfolgenden Schritten erfordern.The emergency stop switches are used to bring the entire machine to a standstill as quickly as possible in the event of danger. However, malfunctions are possible which only require the machine to be stopped in successive steps.

Eine andere Weiterbildung besteht deshalb darin, daß in der elektronischen Steuereinrichtung verschiedene Programme zum Anhalten der Druckmaschine aufrufbar sind. Dazu können weitere Schalter mit Eingängen der elektronischen Steuereinrichtung verbunden sein.Another development is therefore that various programs for stopping the printing press can be called up in the electronic control device. For this purpose, further switches can be connected to inputs of the electronic control device.

Damit ist ein gezieltes Stillsetzen der Druckmaschine möglich - je nachdem, welcher dieser Schalter betätigt wurde. So kann es beispielsweise bei Betätigung eines Schalters im Bereich des Papaieranlegers zweckmäßig sein, den Antrieb des Papaieranlegers zwar sofort zu stoppen, jedoch den Hauptantrieb noch solange laufen zu lassen, bis die in der Maschine befindlichen Druckbögen die Maschine verlassen haben.This enables the press to be shut down in a targeted manner, depending on which of these switches has been actuated. For example, when a switch is actuated in the area of the paper feeder, it may be expedient to stop the drive of the paper feeder immediately, but to keep the main drive running until the printing sheets in the machine have left the machine.

Ausführungsbeispiele der Erfindung sind in der Zeichnung an Hand mehrerer Figuren dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigt:

  • Fig. 1 ein Blockschaltbild einer elektronischen Steuereinrichtung und
  • Fig. 2 ein Blockschaltbild einer weiteren elektronischen Steuereinrichtung mit einer Not-Aus-Einrichtung gemäß einer Weiterbildung der Erfindung.
Exemplary embodiments of the invention are shown in the drawing using several figures and are explained in more detail in the description below. It shows:
  • Fig. 1 is a block diagram of an electronic control device and
  • Fig. 2 is a block diagram of another electronic control device with an emergency stop device according to a development of the invention.

Gleiche Teile sind in den Figuren mit gleichen Bezugszeichen versehen.Identical parts are provided with the same reference symbols in the figures.

Bei der in Fig. 1 dargestellten elektronischen Steuereinrichtung werden ein Hauptantrieb 61 und verschiedene Hilfsantriebe, von denen lediglich zwei Hilfsantriebe 71, 72 dargestellt sind, von zwei Rechnern 52, 53 gesteuert. Die Rechner 52, 53 sind untereinander und mit einer Steuerelektronik 56 mit Hilfe eines Bus-Systems 55 verbunden.In the electronic control device shown in FIG. 1, a main drive 61 and various auxiliary drives, of which only two auxiliary drives 71, 72 are shown, are controlled by two computers 52, 53. The computers 52, 53 are connected to one another and to control electronics 56 with the aid of a bus system 55.

Jeweils eine Hauptantriebselektronik 6 und eine Hilfsantriebselektronik 7 umfaßt neben Leistungsstufen auch zugehörige Ansteuerstufen, die bei einem praktisch ausgeführten erfindungsgemäßen System unter anderem mit Mikroprozessoren ausgerüstet sind.A main drive electronics 6 and an auxiliary drive electronics 7 each comprise, in addition to power stages, also associated control stages which, in a system according to the invention, are equipped with microprocessors, among other things.

Die Steuerelektronik 56 hat vielseitige Aufgaben und umfaßt verschiedene Komponenten. Zum Verständnis der vorliegenden Erfindung ist jedoch lediglich die Erläuterung einer Überwachungsschaltung, welche Teil der Steuerelektronik 56 ist, erforderlich.Control electronics 56 has a variety of functions and includes various components. To understand the present invention, however, only the explanation of a monitoring circuit, which is part of the control electronics 56, is required.

Der überwachungsschaltung wird von einem Tachometer 9 der Istwert der Maschinengeschwindigkeit bzw. der Drehzahl des Hauptantriebes zugeführt. Ein Sollwert wird über das Bus-System 55 zugeleitet. Solange die Abweichung zwischen Soll-und Istwert in einem Bereich ist, der einer normalen Regelabweichung entspricht, werden von der Steuerelektronik zwei in Fig. 1 nicht dargestellte Schütze mit Strom versorgt, so daß die elektromechanische Hauptantriebsbremse gelöst ist.The monitoring circuit is supplied by a tachometer 9 with the actual value of the machine speed or the speed of the main drive. A setpoint is supplied via the bus system 55. As long as the deviation between the setpoint and actual value is in a range which corresponds to a normal control deviation, the control electronics supply two contactors (not shown in FIG. 1) with current, so that the electromechanical main drive brake is released.

Die überwachungsschaltung in der Steuerelektronik 56 gibt bei überschreiten einer zulässigen Abweichung zwischen Soll- und Istwert Signale zur Hauptantriebselektronik 6, um den Hauptantrieb 61 stillzusetzen. Diese Signale können eine Sperre der Zündimpulse der Leistungsstufen und/oder einer Ansteuerung der Leistungsstufen mit elektrischer Bremsung zur Folge haben.The monitoring circuit in the control electronics 56 sends signals to the main drive electronics 6 when an admissible deviation between the setpoint and actual value is exceeded in order to stop the main drive 61. These signals can result in the ignition pulses of the power stages being blocked and / or the power stages being controlled with electrical braking.

Ist bei einem Defekt die Hauptantriebselektronik 6 funktionsfähig, so wird bei einem von der überwachungsschaltung zur Stillsetzung des Hauptantriebs abgegebenen Signal die Maschinengeschwindigkeit durch die elektrische Bremsung schnell sinken, so daß weitere Maßnahmen nicht erforderlich sind.If the main drive electronics 6 are functional in the event of a defect, then the machine quantity will be given a signal emitted by the monitoring circuit for stopping the main drive speed quickly drop due to the electrical braking, so that further measures are not required.

Falls jedoch ein Defekt in der Hauptantriebselektronik 6 vorliegt, der zu einem Versagen der elektrischen Bremsung führt, so kann die Druckmaschine durch Betätigung der elektromechanischen Hauptantriebsbremse 60 stillgesetzt werden. In diesem Fall gibt die überwachungsschaltung ein Signal zur Zündimpulssperre an die Hauptantriebselektronik 6, um zu vermeiden, daß der Hauptantrieb 61 weiterhin mit Strom versorgt wird - falls der Defekt in der Hauptantriebselektronik 6 dieses zuläßt.However, if there is a defect in the main drive electronics 6 that leads to a failure of the electrical braking, the printing press can be stopped by actuating the electromechanical main drive brake 60. In this case, the monitoring circuit sends a signal to the ignition pulse lock to the main drive electronics 6 in order to avoid that the main drive 61 continues to be supplied with current - if the defect in the main drive electronics 6 permits this.

Die überwachungsschaltung überwacht ferner die Funktion der Rechner 52,53 und kann gegebenenfalls bei Ausfall eines Rechners sicherheitsrelevante Funktionen auf den anderen Rechner übertragen.The monitoring circuit also monitors the function of the computers 52, 53 and can, if one computer fails, transfer security-relevant functions to the other computer.

Außerdem überwacht die Überwachungsschaltung die Hilfsantriebselektronik 7, die Hilfsantriebe 71,72 sowie eine dem Hilfsantrieb 71 zugeordnete Bremsvorrichtung 70.In addition, the monitoring circuit monitors the auxiliary drive electronics 7, the auxiliary drives 71, 72 and a braking device 70 assigned to the auxiliary drive 71.

Wird ein Not-Aus-Signal von einer entsprechenden Einrichtung 57 ausgelöst, so wird es zu den Rechnern 52,53, zur Hauptantriebselektronik 6, zur Hilfsantriebselektronik 7 und zur Steuerelektronik 56 geleitet. Sofern kein Defekt in der elektronischen Steuereinrichtung vorliegt, wird die Druckmaschine wie oben beschrieben ohne Zuhilfenahme der elektromechanischen Bremsen angehalten. Erst wenn ein Defekt vorliegt, der dieses verhindert, wird die Druckmaschine mit Hilfe der elektromechanischen Bremsen stillgesetzt.If an emergency stop signal is triggered by a corresponding device 57, it is sent to the computers 52, 53, to the main drive electronics 6, to the auxiliary drive electronics 7 and to the control electronics 56. If there is no defect in the electronic control device, the printing press is stopped as described above without the aid of the electromechanical brakes. Only when there is a defect that prevents this, the printing machine is stopped using the electromechanical brakes.

Fig. 2 zeigt Not-Aus-Schalter 11 bis 1 n, welche an ein elektronisches Steuersystem für eine Druckmaschine angeschlossen sind. Letzteres besteht aus einer Ein/Ausgabe-Einheit 4, einer Recheneinheit 5 und Leistungsteilen 6,7, welche Motoren 61,71 zugeordnet sind. Die Leistungsteile entsprechen im wesentlichen der Hauptantriebselektronik 6 und der Hilfsantriebselektronik 7 (Fig. 1). Der übersichtlichkeit halber wurden lediglich zwei Motoren nämlich der Motor 61 des Hauptantriebes und ein Motor 71 eines Hilfsantriebes dargestellt, obwohl Druckmaschinen über wesentlich mehr Motore verfügen können. Die Auslegung des elektronischen Steuersystems im einzelnen ist in vielfältiger Weise möglich, ohne den Rahmen der Erfindung zu verlassen. Bei dem gezeigten Ausführungsbeispiel umfaßt die Ein/Ausgabe-Einheit 4 zwei Ein/AusgabeKarten 41, 42, welche jeweils eine Vielzahl von Eingängen und Ausgängen 43, 44 aufweisen. Die Ein/Ausgabe-Karten 41, 42 sind untereinander und mit der Ein/Ausgabe-Steuerkarte 51, welche unter anderem die Überwachungsschaltung enthält, der Recheneinheit über ein Bussystem 45 verbunden.Fig. 2 shows emergency stop switches 11 to 1 n, which are connected to an electronic control system for a printing press. The latter consists of an input / output unit 4, a computing unit 5 and power units 6, 7, which are assigned to motors 61, 71. The power units essentially correspond to the main drive electronics 6 and the auxiliary drive electronics 7 (FIG. 1). For the sake of clarity, only two motors, namely the motor 61 of the main drive and a motor 71 of an auxiliary drive, have been shown, although printing presses can have significantly more motors. The design of the electronic control system in detail is possible in a variety of ways without departing from the scope of the invention. In the exemplary embodiment shown, the input / output unit 4 comprises two input / output cards 41, 42, each of which has a multiplicity of inputs and outputs 43, 44. The input / output cards 41, 42 are connected to one another and to the input / output control card 51, which contains the monitoring circuit, among other things, of the computing unit via a bus system 45.

In der Recheneinheit sind zwei Rechner 52, 53 vorgesehen, welche an sich verschiedene Aufgaben erfüllen, jedoch derart programmiert sind, daß bei Ausfall eines der Rechner 52, 53 der andere Rechner Aufgaben des ausgefallenen Rechners, insbesondere sicherheitsrelevante Steuerungen, übernimmt. Die Rechnereinheit 5 umfaßt ferner eine Speicherkarte 54 zur Speicherung von Daten, beispielsweise Daten der Druckmaschine und Daten der zu bearbeitenden Aufträge. Dazu sind auf der Speicherkarte 54 nichtflüchtige Speicher vorgesehen. Bei einem praktisch ausgeführten elektronischen Steuersystem wurden die Programme selbst in Nur-Lese-Speichern abgelegt, welche auf den Karten der Rechner 52 und 53 angeordnet sind. Es sind jedoch auch andere Konfigurationen zur Speicherung der Programme im Rahmen der Erfindung möglich. Ein Bussystem 55 verbindet die Ein/Ausgabe-Steuerung 51, die Rechner 52, 53 und die Speicherkarte 54.Two computers 52, 53 are provided in the computing unit, which perform different tasks per se, but are programmed in such a way that if one of the computers 52, 53 fails, the other computer takes over tasks of the failed computer, in particular safety-related controls. The computer unit 5 also includes a memory card 54 for storing data, for example data from the printing press and data from the jobs to be processed. For this purpose, non-volatile memories are provided on the memory card 54. In a practical electronic control system, the programs themselves were stored in read-only memories which are arranged on the cards of the computers 52 and 53. However, other configurations for storing the programs are also possible within the scope of the invention. A bus system 55 connects the input / output controller 51, the computers 52, 53 and the memory card 54.

Während bei dem dargestellten elektronischen Steuerungssystem die Ein/Ausgabe-Einheit 4 für binäre Signale vorgesehen ist (beispielsweise Schalter geschlossen, Schalter offen; Relais anziehen, Relais abfallen), erfolgt die Ausgabe von digitalen Signalen, welche zur Steuerung der Leistungsteile 6,7 und damit der Motoren 61,71 dienen, über die Ein/Ausgabe-Steuerung 51. Der Ein/Ausgabe-Steuerung 51 wird ferner von einem Tachometer 9 ein der Maschinengeschwindigkeit entsprechendes Signal zugeführt.While in the electronic control system shown the input / output unit 4 is provided for binary signals (for example switches closed, switches open; relays attract, relays drop out), digital signals are output which are used to control the power units 6, 7 and thus of the motors 61, 71 are used via the input / output control 51. The input / output control 51 is also supplied with a signal corresponding to the machine speed by a tachometer 9.

Von mehreren den Motoren zugeordneten Bremseinrichtungen ist lediglich die dem Hauptantrieb zugeordnete elektromechanische Bremseinrichtung schematisch dargestellt. Dabei wird ein Elektromagnet 63 zum Lüften der Bremse über zwei Kontakte 64,65 zweier Schütze 67,68 mit bei 66 zugeführter Betriebsspannung versorgt. Die Kontakte 64,65 sind als Arbeitskontakte ausgelegt, so daß die Bremse nur dann gelüftet wird, wenn beide Kontakte 64,65 geschlossen sind, was wiederum nur der Fall ist, wenn beide Schütze 67,68 von der Ein/Ausgabe-Einheit 4 mit Spannung versorgt werden.Of several brake devices assigned to the motors, only the electromechanical brake device assigned to the main drive is shown schematically. An electromagnet 63 for releasing the brake is supplied with operating voltage supplied at 66 via two contacts 64, 65, two contactors 67, 68. The contacts 64, 65 are designed as working contacts, so that the brake is only released when both contacts 64, 65 are closed, which in turn is only the case when both contactors 67, 68 from the input / output unit 4 Voltage are supplied.

Die Notschalter, von denen der übersichtlichkeit halber lediglich die Notschalter 11,12,13 und 1 dargestellt sind, können mit Pilzdruckknöpfen versehen sein. Es können jedoch auch andere Betätigungsvorrichtungen, wie beispielsweise Hebel, Trittleisten und Schalter, die beim öffnen von Schutzgittern betätigt werden, vorgesehen werden. Jeder der Notschalter 11 bis 1 weist zwei als Ruhekontakt arbeitende Kontaktpaare 21 bis 2n, 31 bis 3n auf. Die jeweils ersten Kontaktpaare 21 bis 2n sind in Reihe geschaltet und verbinden einen mit Netzspannung versehenen Anschluß 1 mit der Primärwicklung 81 eines Transformators.The emergency switches, of which only the emergency switches 11, 12, 13 and 1 are shown for the sake of clarity, can be provided with mushroom push buttons. However, other actuating devices, such as, for example, levers, tread strips and switches, which are actuated when protective guards are opened, can also be provided. Each of the emergency switches 11 to 1 has two contact pairs 21 to 2n, 31 to 3n working as a normally closed contact. The respective first contact pairs 21 to 2n are connected in series and connect a connection 1 provided with mains voltage to the primary winding 81 of a transformer.

An die Sekundärwicklung 82 des Transformators ist ein Gleichrichter 83 angeschlossen. Es wird somit eine galvanische Trennung zwischen dem durch die Reihenschaltung der jeweils ersten Kontaktpaare und der Primärwicklung 81 gebildeten Sicherheitsstromkreis und den nachfolgenden Schaltungen erzielt. Außerdem wird die Schaltspannung auf einen zur Anstellerung von Halbleiterschaltungen geeigneten Wert herabgesetzt, während die den Sicherheitsstromkreis speisende Spannung einen genügend großen Wert aufweist, um trotz der Reihenschaltung vieler Kontaktpaare einen sicheren Stromfluß zu gewährleisten. Über ein Schütz 84 sind entsprechende Eingänge der Leistungsteile 6,7, der Rechner 52,53 und der Ein/Ausgabe-Steuerung 51 mit dem Sicherheitskreis verbunden.To the secondary winding 82 of the Transforma a rectifier 83 is connected. There is thus a galvanic separation between the safety circuit formed by the series connection of the respective first contact pairs and the primary winding 81 and the subsequent circuits. In addition, the switching voltage is reduced to a value suitable for switching on semiconductor circuits, while the voltage supplying the safety circuit has a sufficiently large value to ensure a safe current flow despite the series connection of many contact pairs. Corresponding inputs of the power units 6, 7, the computer 52, 53 and the input / output controller 51 are connected to the safety circuit via a contactor 84.

Die jeweils zweiten Kontaktpaare 31 bis 3n der Notschalter 11 bis 1 sind an Eingänge der Ein/Ausgabe-Einheit 4 des elektronischen Steuersystems angeschlossen.The respective second contact pairs 31 to 3n of the emergency switches 11 to 1 are connected to inputs of the input / output unit 4 of the electronic control system.

Bei Betätigung eines der Not-Aus-Schalter 11 bis 1 wird der Sicherheitsstromkreis unterbrochen, so daß die Primärwicklung 81 nicht mehr über den Anschluß 1 mit Netzspannung versorgt wird. Daraufhin wird auch die Sekundärspannung sowie die Ausgangsspannung des Gleichrichters 83 zu 0, und das Schütz 84 fällt ab. Diese Vorgänge benötigen eine gewisse Zeit, während - ausgelöst vom öffnen des zweiten Kontaktes des betätigten Not-Aus-Schalters - in der elektronischen Steuereinrichtung 5 bereits entsprechende Programmschritte zum Stillsetzen der Druckmaschine eingeleitet werden.When one of the emergency stop switches 11 to 1 is actuated, the safety circuit is interrupted, so that the primary winding 81 is no longer supplied with mains voltage via the connection 1. The secondary voltage and the output voltage of the rectifier 83 then also become 0, and the contactor 84 drops out. These processes take a certain time, while - triggered by the opening of the second contact of the actuated emergency stop switch - appropriate program steps for stopping the printing press are already being initiated in the electronic control device 5.

Sollten in der Ein/Ausgabe-Einheit 4 oder in der Recheneinheit 5 Defekte vorliegen, welche eine wirksame Weiterleitung der von den jeweils zweiten Kontakten 31 bis 3n der Not-Aus-Schalter 11 bis 1 n abgegebenen Signale verhindern, so wird die Druckmaschine trotzdem über den von den jeweils ersten Kontakten 11 bis 1 n, dem Transformator 81,82, dem Gleichrichter 83 und dem Schütz 84 gebildeten Sicherheitskreis angehalten.If there are defects in the input / output unit 4 or in the arithmetic unit 5, which prevent effective transmission of the signals emitted by the respective second contacts 31 to 3n of the emergency stop switches 11 to 1n, the printing press is nevertheless over the safety circuit formed by the respective first contacts 11 to 1 n, the transformer 81, 82, the rectifier 83 and the contactor 84 is stopped.

Erst wenn die elektronische Steuereinrichtung nicht in der Lage ist, die Druckmaschine durch elektrische Bremsung anzuhalten, wird - wie im Zusammenhang mit Fig. 1 beschrieben - die elektromechanische Bremsvorrichtung 60 betätigt. Dazu werden die Schütze 67,68 stromlos geschaltet, wodurch die Magnetspule 63 mit Hilfe der Kontakte 64,65 von der bei 66 zugeführten Betriebsspannung getrennt wird. Bei der Einrichtung nach Fig. 2 erfolgt die Steuerung der Schütze 67,68 zwar über die Ein/Ausgabe-Einheit 4, es sind jedoch zur Gewährleistung einer hohen Sicherheit zwei getrennte Ausgangskreise für die Schütze 67,68 vorgesehen.Only when the electronic control device is unable to stop the printing press by electrical braking, is the electromechanical braking device 60 actuated, as described in connection with FIG. 1. For this purpose, the contactors 67, 68 are de-energized, whereby the magnetic coil 63 is separated from the operating voltage supplied at 66 with the aid of the contacts 64, 65. 2, the control of the contactors 67, 68 takes place via the input / output unit 4, but two separate output circuits are provided for the contactors 67, 68 to ensure a high level of security.

Auch wenn keine ausgesprochene Notsituation vorliegt, kann ein außerplanmäßiges Anhalten der Druckmaschine erwünscht sein. Dazu können weitere Schalter 85,86 mit Eingängen der Ein/Ausgabe-Einheit 4 verbunden sein. Durch diese Schalter können Programme abgerufen werden, welche ein der jeweiligen Situation entsprechendes, gezieltes Stillsetzen der Druckmaschine zur Folge haben.Even if there is no pronounced emergency situation, an unscheduled stopping of the printing press may be desirable. For this purpose, further switches 85, 86 can be connected to inputs of the input / output unit 4. These switches can be used to call up programs which result in a targeted shutdown of the printing press in accordance with the respective situation.

Claims (13)

1. Safety system for a printing machine, comprising at least one drive device and one brake device for the moved machine parts, and comprising an electric control device having power stages which permit electronic braking of the drive device,
characterized in
that the electronic control device (56) comprises a monitoring circuit to which set values and actual values of the rotary speed of the drive device (61, 71, 72) may be fed and which actuates the brake device in the case of an impermissibly high deviation between set value and actual value.
2. Safety system according to Claim 1,
characterized in
that the brake device is actuated by switching off an electromagnet releasing the brake against a spring force.
3. Safety system according to one of the preceding claims,
characterized in
that two contact pairs of two contactors are connected in series with the electromagnets, and that said contactors may be activated via separate output circuits of the electronic control device.
4. Safety system according to one of the preceding claims,
characterized in
that the brake device is designed such that the printing machine may even be stopped when the drive device develops its highest possible torque.
5. Safety system according to one of the preceding claims,
characterized in
that, before being actuated, the monitoring circuit sends to the power stages control signals for stopping the printing machine and re- checks the deviation between set value and actual value of the rotary speed.
6. Safety system according to one of the preceding claims, characterized in that the brake device is checked by actuating the brake device, controlling the drive device to the highest possible torque and evaluating the actual speed value.
7. Safety system according to Claim 6,
characterized in
that the check is effected after having switched on the electronic control device.
8. Safety system according to one of the preceding claims,
characterized in
that in an electronic control device including two computers the monitoring circuit compares the safety-related functions of said computers with one another and, in the case of failure of the one computer, assigns the control of the drive device to the other computer.
9. Safety system according to one of the preceding claims,
characterized in
that further brake devices assigned to further drive devices (auxiliary drives) may be controlled by the monitoring circuit.
10. Safety system according to one of the preceding claims,
characterized in
that emergency stop signals may be fed to the monitoring circuit, the power stages and one computer or to a plurality of computers simultaneously.
11. Safety system according to Claim 10,
characterized in
that each of a plurality of emergency stop switches (11 to 1 n) comprises a respective first and a respective second pair of contacts which may be actuated simultaneously, that said first contact pairs (21 to 2n) are connected in series and form a safety circuit, and that said second contact pairs (31 to 3n) are individually connected to inputs of the electronic control device (4, 5).
12. Safety system according to Claim 11,
characterized in
that the safety circuit is fed with an AC mains voltage, and that a primary winding (81) of a transformer is connected in series with the first contact pairs (21 to 2n), a secondary winding (82) of said transformer being connected, via a rectifier (83), to the power stages, the monitoring circuit and the computer/computers.
13. Safety system according to Claim 1, characterized in that the electronic control device (4, 5) includes various programmes for stopping the printing machine.
EP87104965A 1986-05-02 1987-04-03 Safety system for a printing machine Expired - Lifetime EP0243728B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614979 1986-05-02
DE3614979A DE3614979C3 (en) 1986-05-02 1986-05-02 Security system for a printing press

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EP0243728A2 EP0243728A2 (en) 1987-11-04
EP0243728A3 EP0243728A3 (en) 1989-08-30
EP0243728B1 true EP0243728B1 (en) 1992-03-18
EP0243728B2 EP0243728B2 (en) 1995-12-13

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EP (1) EP0243728B2 (en)
JP (1) JPS62271745A (en)
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DE (2) DE3614979C3 (en)

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DE378616C (en) * 1922-05-11 1923-07-21 Walter Nowak Device for stopping and braking electrically driven printing machines or other machines when a paper web or a rope-like strand of goods tears
DE1110658B (en) * 1959-06-03 1961-07-13 Planeta Veb Druckmasch Werke Circuit arrangement on sheet-fed rotary offset printing machines
DE1098258B (en) * 1959-10-14 1961-01-26 Maschf Augsburg Nuernberg Ag Safety device for monitoring the speed of a shaft
US3183423A (en) * 1961-09-22 1965-05-11 Square D Co Limit control for motors
US3296512A (en) * 1963-10-23 1967-01-03 Westinghouse Electric Corp Controlled braking system for load lifting apparatus
GB1276843A (en) * 1968-08-28 1972-06-07 Antoma Hairdressing Company Lt Improvements in or relating to uprintin machines
DD226708B1 (en) * 1984-09-03 1989-07-05 Medizin Labortechnik Veb K CIRCUIT ARRANGEMENT FOR THE RELIABILITY MONITORING OF SPEED PULSES
DE3447090A1 (en) * 1984-12-22 1986-06-26 Heidelberger Druckmaschinen Ag, 6900 Heidelberg METHOD AND DEVICE FOR BRAKE CONTROL OF A MOTION MONITORED AND CONTROLLED DRIVE MOTOR IN A PRINTING MACHINE
US4643091A (en) * 1985-11-25 1987-02-17 Ncr Corporation Electromagnetic clutch-brake positioning assembly

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0453845A1 (en) * 1990-04-25 1991-10-30 MAN Roland Druckmaschinen AG Sheet-fed offset printing machine with at least one printing unit
EP0502408A1 (en) * 1991-03-05 1992-09-09 Grafotec Kotterer Gmbh Method of and device for controlling webs
DE4327848A1 (en) * 1993-08-19 1995-03-02 Roland Man Druckmasch Control device for a printing press
US5676055A (en) * 1993-08-19 1997-10-14 Man Roland Druckmaschinen Ag Control device for a printing machine
DE4413047A1 (en) * 1994-04-15 1995-10-19 Roland Man Druckmasch Method and device for brake monitoring the DC motor of a printing press
US5524541A (en) * 1994-04-15 1996-06-11 Man Roland Druckmaschinen Ag Method and apparatus for controlling the braking of a printing machine
DE19504069A1 (en) * 1995-02-08 1996-08-22 Roland Man Druckmasch Method and device for braking an electrical main drive of a printing press
US5901647A (en) * 1995-03-18 1999-05-11 Koenig & Bauer-Albert Aktiengesellschaft Process for driving equipment e.g. a folding device for a rotary press
DE19643252A1 (en) * 1996-10-19 1998-04-30 Roland Man Druckmasch Control for driving a printing press
US5878665A (en) * 1996-10-19 1999-03-09 Man Roland Druckmaschinen Ag Control system for the drive of a printing machine
DE19643252C2 (en) * 1996-10-19 1999-05-20 Roland Man Druckmasch Control for the operation of a printing press
EP0978380A2 (en) * 1998-08-05 2000-02-09 MAN Roland Druckmaschinen AG Control unit for a printing machine

Also Published As

Publication number Publication date
JPS62271745A (en) 1987-11-26
DE3614979A1 (en) 1987-11-05
DE3614979C2 (en) 1994-02-10
EP0243728A2 (en) 1987-11-04
EP0243728A3 (en) 1989-08-30
DE3614979C3 (en) 1999-12-16
US4951567A (en) 1990-08-28
CA1286021C (en) 1991-07-09
EP0243728B2 (en) 1995-12-13
DE3777437D1 (en) 1992-04-23

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