Claims
- 1. An apparatus for controlling an operating speed comprising: a printing press having multiple operating states; a motor for driving the printing press; a tachometer for sensing the operating speed of the motor; a braking mechanism for stopping the motor; and a control system, the control system comprising: an input means comprising at least one sensor which is independent of operator input for providing input signals indicating an operating state of the printing press; a controller electrically connected to the sensor for receiving input signals from the sensor and for generating control signals corresponding thereto; a driver associated with the motor and connected to the controller for supplying electrical current to the motor at levels corresponding to the operating state of the printing press; a monitoring device responsive to the input signals from the sensor for determining a maximum permitted speed independent of operator input; the monitor device including a look-up table containing the operating states of the printing press, where each of the operating states is associated with a value for the maximum permitted speed; and the monitoring device being connected to the tachometer and to the driver for stopping the current supplied to the motor when the speed of the motor exceeds the maximum permitted speed.
- 2. An apparatus for controlling an operating speed as defined in claim 1 wherein the input means comprises at least one switch for indicating the operating state of the printing press.
- 3. An apparatus for controlling an operating speed as defined in claim 1 wherein the input means comprises sensors for detecting the operating state of the printing press.
- 4. An apparatus for controlling an operating speed as defined in claim 1 wherein the monitoring device interrogates the input means cyclically to determine the operating state of the printing press.
- 5. An apparatus for controlling an operating speed as defined in claim 1 further comprising a main circuit breaking means for selectively preventing current flow to the driver.
- 6. An apparatus for controlling an operating speed as defined in claim 5 wherein the monitoring device is connected to the main circuit breaking means, the monitoring device selectively triggering the main circuit breaking means to prevent current flow to the driver.
- 7. An apparatus for controlling an operating speed as defined in claim 1 further comprising a first bus system connecting the controller and the input means, and a second bus system connecting the monitoring device and the input means.
- 8. An apparatus for controlling an operating speed as defined in claim 1 wherein the monitoring device is connected to the braking mechanism of the printing press, the monitoring device activating the braking mechanism when the speed of the motor exceeds the maximum permitted speed.
- 9. An apparatus for controlling an operating speed as defined in claim 1 wherein the driver further comprises a quick stopping terminal for stopping the flow of current to the motor at a first rate and a normal stopping terminal for stopping the flow of current to the motor at a second rate, the first rate being faster than the second rate.
- 10. An apparatus for controlling an operating speed as defined in claim 9 wherein the quick stopping terminal and the normal stopping terminal are each coupled to the monitoring device.
- 11. An apparatus for controlling an operating speed as defined in claim 10 wherein the quick stopping terminal and the normal stopping terminal are each coupled to the controller.
- 12. An apparatus for controlling an operating speed as defined in claim 10 wherein the quick stopping terminal is connected to the monitoring device, the monitoring device triggering the braking mechanism when the quick stopping terminal is activated and the tachometer indicates the motor speed is not decreasing.
- 13. An apparatus for controlling an operating speed as defined in claim 10 wherein the normal stopping terminal is connected to the monitoring device, the monitoring device triggering the braking mechanism when the normal stopping terminal is activated and the tachometer indicates the motor speed is not decreasing.
- 14. An apparatus for controlling an operating speed as defined in claim 11 wherein the input means includes an emergency stop switch for generating a stopping signal and wherein the controller and the monitoring device trigger the quick stopping terminal of the driver in response to the stopping signal.
- 15. An apparatus for controlling an operating speed as defined in claim 6 wherein the monitoring device is connected to the braking mechanism, the monitoring device triggering the main circuit breaking means when the brake is released and the tachometer indicates the motor is not rotating.
- 16. An apparatus for controlling an operating speed as defined in claim 1 wherein the controller and the monitoring device are connected such that one of the control signals generated by the controller is received by the monitoring device and the driver.
- 17. An apparatus for controlling an operating speed as defined in claim 1 wherein the motor and the driver are a first motor and a first driver respectively, and the monitoring device monitors a second driver of a second motor in the printing press.
- 18. An apparatus for controlling an operating speed comprising: a printing press having multiple operating states; a motor for driving the printing press; a tachometer for sensing the operating speed of the motor; a braking mechanism for stopping the motor; and a control system, the control system comprising: an input means comprising at least one sensor which is independent of operator input for inputting signals indicating the operating state of the printing press; a drive circuit coupled to the sensor and the motor for selectively supplying a predetermined level of current to the motor, the predetermined level of current being determined by the operating state of the printing machine, the drive circuit including a quick stopping terminal for reducing the current supplied to the motor at a first rate and a normal stopping terminal for reducing the current supplied to the motor at a second rate, the first rate being faster than the second rate; a selectively activated circuit breaking means for stopping current flow to the drive circuit; and a monitoring device coupled to the sensor, the drive means, the selectively activated circuit breaking means, the tachometer and the braking mechanism, the monitoring device responsive to the signals from the sensor for determining a maximum permitted speed therefrom independent of operator input, the monitoring device including a look-up table containing the operating states of the printing press, where each of the operating states is associated with a value for the maximum permitted speed, the monitoring device comparing the speed of the motor indicated by the tachometer to the maximum permitted speed and triggering the quick stopping terminal to stop current flow to the motor if the maximum permitted speed is exceeded, the monitoring device activating the braking mechanism and the selectively activated circuit breaking means if the tachometer indicates the speed of the motor is not decreasing after the quick stopping terminal has been triggered.
- 19. An apparatus for controlling an operating speed as defined in claim 18 further comprising a control circuit coupled to the input means and the drive circuit, the control circuit providing the drive circuit with control signals setting the predetermined level of current to be supplied to the motor.
- 20. An apparatus for controlling an operating speed comprising: a printing press having multiple operating states; a motor for driving the printing press; a tachometer for sensing the operating speed of the motor; a braking mechanism for stopping the motor; and a control system, the control system comprising: at least one sensor which is independent of operator input for providing input signals indicating an operating state of the printing press; a controller electrically connected to the sensor for receiving input signals from the sensor and for generating control signals corresponding thereto; a driver associated with the motor and connected to the controller for supplying electrical current to the motor at levels corresponding to the operating state of the printing press; a monitoring device responsive to the input signals from the sensor for determining a maximum permitted speed independent of operator input, the monitoring device continuously sensing the input signals, the monitoring device including a look-up table containing the operating states of the printing press, where each of the operating states is associated with a value for the maximum permitted speed; and the monitoring device being connected to the tachometer and to the driver for stopping the current supplied to the motor when the speed of the motor exceeds the maximum permitted speed.
Priority Claims (1)
Number |
Date |
Country |
Kind |
43 27 848.5 |
Aug 1993 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 08/293,392 filed on Aug. 19, 1994, now abandoned.
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4951567 |
Rodi et al. |
Aug 1990 |
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Rodi |
May 1991 |
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EPX |
35 41 277 A1 |
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36 14 979 A1 |
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Non-Patent Literature Citations (1)
Entry |
DE-Prospekt: Siemens, Nr. E319, Regelsysteme, E31 Information, Antriebs-und Regleungstechnik (Modulpac C), Seite 7. |
Continuations (1)
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Number |
Date |
Country |
Parent |
293392 |
Aug 1994 |
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