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EP0074250A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Press speed control and indication system

Assignee: Nidec Minster Corp
•
Filing: 1982-09-02
•
Granted: —
•
Expires: 2002-09-02
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Abstract

Abstract An electric motor supplied with a speed control voltage from a control 12 is connected to a flywheel 1 and drives the slide of a press through a clutch. A tachometer generator 24 coupled to the flywheel supplies to a speed meter 28 by way of a potentiometer 30 and relay contacts 32 a voltage indicative of the speed of the flywheel. Contacts 32 are open when the clutch is not energised and potentiometer 30 modifies the voltage supplied to the meter 28 to cause the meter to indicate a pre-set normal running speed of the press even though the flywheel is running at a speed higher than the said normal running speed. A second potentiometer 22 and relay contacts 20 which are closed when the clutch is not energised modifies the speed control voltage in such a way as to cause the flywheel to be driven at a higher than normal speed when the clutch is not energised but to be driven at its normal speed when the clutch is energised and the contacts 22 are opened. The meter 28 thus indicates normal running speed both during the over speed period when the clutch is de-energised and also when the speed falls as soon as the clutch is energised.

Inventors

  • 👤 Michael J. Olding
  • 👤 Daniel A. Schoch

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 05:51
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/14; B30B15/148

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 201 words
A mechanical press having a reciprocable slide driven by a mechanical drive train, a motor drivingly connected to a flywheel for continuously rotating the flywheel, a clutch for coupling the rotation of the flywheel to the mechanical drive train when the clutch is energised, a speed control for providing a variable speed control voltage to the motor to control the speed of the flywheel, and a tachometer generator mechanically coupled to the flywheel to provide to a speed meter a voltage indicative of the speed of the flywheel characterised by first means 30, 32 activated only when the clutch is not energised for modifying the voltage supplied to the meter 28 to cause the meter to indicate a pre-set normal running speed of the press even though the flywheel is running at a speed higher than the said normal running speed, and second means 20, 22 activated only when the clutch is energised and which, when de-activated, allows the speed control voltage to assume a value to cause the flywheel to be driven at higher than its said normal running speed but when activated modifies the speed control voltage so that the flywheel is driven at the said normal running speed.
Claim 2
Dependent Claim 201 words
A mechanical press having a reciprocable slide driven by a mechanical drive train, a motor drivingly connected to a flywheel for continuously rotating the flywheel, a clutch for coupling the rotation of the flywheel to the mechanical drive train when the clutch is energised, a speed control for providing a variable speed control voltage to the motor to control the speed of the flywheel, and a tachometer generator mechanically coupled to the flywheel to provide to a speed meter a voltage indicative of the speed of the flywheel characterised by first means 30, 32 activated only when the clutch is not energised for modifying the voltage supplied to the meter 28 to cause the meter to indicate a pre-set normal running speed of the press even though the flywheel is running at a speed higher than the said normal running speed, and second means 20, 22 activated only when the clutch is energised and which, when de-activated, allows the speed control voltage to assume a value to cause the flywheel to be driven at higher than its said normal running speed but when activated modifies the speed control voltage so that the flywheel is driven at the said normal running speed.
Claim 3
Dependent Claim 36 words
A press according to claim 1 characterised in that the first'and second modifying means are variable resistors or potentiometers 22, 30 connected in parallel with respective relay contacts 20, 32 which are always in opposite states.
Claim 4
Dependent Claim 116 words
A method of operating a press according to claim 1 so as to control the speed of the flywheel and indicate to the press operator the speed thereof characterised by causing the flywheel to run at a speed higher than a pre-set normal running speed when the clutch is de-energised and then run at the said pre-set normal running speed when the clutch is energised, and causing the meter to indicate the flywheel speed as being the said pre-set normal running speed both when the clutch is de-energised and the flywheel is running at a higher speed, and when the clutch is energised and the flywheel is actually running at the said pre-set normal running speed.

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