Process for supplying energy to electronically controled press drives

• US 5,669,294 A
• Filed: 07/12/1996
• Issued: 09/23/1997
• Est. Priority Date: 07/20/1995
• Status: Expired due to Term

• Current Assignee: Schuler Pressen GmbH & Company KG
• Original Assignee: Schuler Pressen GmbH & Company KG
• Inventors: Klemm, Peter, Schumann, Burkhard
• Primary Examiner(s): GERRITY, STEPHEN FRANCIS
• Application Number:
  US08/679,723
• Time in Patent Office: 438 Days
• Field of Search: 100/35, 100/43, 100/45, 100/48, 100/53, 100/207, 100/215
• US Class Current: 100/35
• CPC Class Codes: B30B 15/148 Electrical control arrangements

Abstract

A process supplies energy to electronically controlled drives, particularly drives for workpiece handling devices, in and on a press having a press slide. The workpiece handling devices are electromechanically driven and electronically controlled. In the event of a power supply system outage, at least the workpiece handling devices are supplied at least for a short time by an intermediate circuit of a drive amplifier or an uninterruptable power supply system with voltage. Thereby, all devices important for the movement of the workpiece handling devices are supplied with voltage from the intermediate circuit or the uninterruptable power supply system.

Claims

1. A process for supplying energy to electronically controlled drives for electromechanically driven and electronically controlled workpiece handling devices in and on a press having a slide, comprising the steps of, in the event of a power supply outage, supplying at least the workpiece handling devices with voltage by one of an intermediate circuit of a drive amplifier and a uninterruptable power supply, and supplying all devices essential for movement of the workpiece handling devices with the voltage from the one of the intermediate circuit and the uninterruptable power supply.

2. The process according to claim 1, wherein capacitors in the intermediate circuit of the drive amplifier are charged by one of kinetic energy of moved masses in and on the press and by applied power supply voltage.

3. The process according to claim 2, wherein the capacitors are charged by the energy of a press flywheel.

4. The process according to claim 1, wherein the workpiece handling devices, after determination of a power supply outage, are moved out of the collision area, with other moved components of the press being braked in an uncontrolled manner.

5. The process according to claim 4, wherein capacitors in the intermediate circuit of the drive amplifier are charged by one of kinetic energy of moved masses in and on the press and by applied power supply voltage.

6. The process according to claim 5, wherein the capacitors are charged by the energy of a press flywheel.

7. The process according to claim 1, wherein, after determination of a power supply outage, synchronous movement of the workpiece handling devices and other essential press parts of the press is maintained until the press stops.

8. The process according to claim 7, wherein capacitors in the intermediate circuit of the drive amplifier are charged by one of kinetic energy of moved masses in and on the press and by applied power supply voltage.

9. The process according to claim 8, wherein the capacitors are charged by the energy of a press flywheel.

10. The process according to claim 1, wherein the workpiece handling devices comprise transfer systems with gripper rails.

11. The process according to claim 10, wherein capacitors in the intermediate circuit of the drive amplifier are charged by one of kinetic energy of moved masses in and on the press and by applied power supply voltage.

12. The process according to claim 11, wherein the capacitors are charged by the energy of a press flywheel.

13. The process according to claim 10, wherein the workpiece handling devices, after determination of a power supply outage, are moved out of the collision area, with other moved components of the press being braked in an uncontrolled manner.

14. The process according to claim 10, wherein, after determination of a power supply outage, synchronous movement of the workpiece handling devices and other essential press parts of the press is maintained until the press stops.

15. The process according to claim 1, wherein the workpiece handling devices comprise suction traverses.

16. The process according to claim 15, wherein capacitors in the intermediate circuit of the drive amplifier are charged by one of kinetic energy of moved masses in and on the press and by applied power supply voltage.

17. The process according to claim 15, wherein the workpiece handling devices, after determination of a power supply outage, are moved out of the collision area, with other moved components of the press being braked in an uncontrolled manner.

18. The process according to claim 15, wherein, after determination of a power supply outage, synchronous movement of the workpiece handling devices and other essential press parts of the press is maintained until the press stops.

19. The process according to claim 1, wherein the workpiece handling devices comprise at least one of workpiece insertion devices and workpiece removal devices.

20. The process according to claim 19, wherein capacitors in the intermediate circuit of the drive amplifier are charged by one of kinetic energy of moved masses in and on the press and by applied power supply voltage.