EP0074250B1 - Geschwindigkeitsüberwachung einer Presse und Anzeigesystem - Google Patents

Geschwindigkeitsüberwachung einer Presse und Anzeigesystem Download PDF

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Publication number
EP0074250B1
EP0074250B1 EP19820304619 EP82304619A EP0074250B1 EP 0074250 B1 EP0074250 B1 EP 0074250B1 EP 19820304619 EP19820304619 EP 19820304619 EP 82304619 A EP82304619 A EP 82304619A EP 0074250 B1 EP0074250 B1 EP 0074250B1
Authority
EP
European Patent Office
Prior art keywords
speed
flywheel
clutch
energised
press
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.)
Expired
Application number
EP19820304619
Other languages
English (en)
French (fr)
Other versions
EP0074250A3 (en
EP0074250A2 (de
Inventor
Michael J. Olding
Daniel A. Schoch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Minster Corp
Original Assignee
Minster Machine Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Minster Machine Co filed Critical Minster Machine Co
Publication of EP0074250A2 publication Critical patent/EP0074250A2/de
Publication of EP0074250A3 publication Critical patent/EP0074250A3/en
Application granted granted Critical
Publication of EP0074250B1 publication Critical patent/EP0074250B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/14—Control arrangements for mechanically-driven presses
    • B30B15/148—Electrical control arrangements

Definitions

  • the present invention relates to mechanical presses, and in particular to a speed control and indication system for such presses.
  • One well-known type of mechanical press comprises a frame having a slide reciprocably guided therein with at least one crankshaft rotatable in the crown portion of the frame and connected to the slide by a connection so that when the crankshaft rotates, the slide is caused to reciprocate.
  • a press of this type includes a massive flywheel which is driven by an electric motor through a clutch mechanism.
  • a variable speed coupling such as an eddy current coupling is provided between the motor and flywheel so that the running speed of the flywheel can be varied by varying a speed control voltage.
  • the flywheel rotates continuously when the motor is energised, but the rotary motion is not coupled to the crankshaft as long as the clutch is de-energised.
  • the rotary motion of the flywheel is coupled to the crankshaft, which generally runs at the same speed as the flywheel, although a gearing arrangement may be used to provide a drive ratio which is greater or less than 1:1.
  • a tachometer generator is mechanically coupled to the flywheel to provide to a speed meter a voltage indicative of the speed of the flywheel.
  • the press attain running speed on the first stroke after engagement of the clutch thereby making it necessary to prevent the drop in press speed discussed above. Since the amount of speed drop is proportional to the rotational energy of the press parts which must be accelerated to running speed from a static condition, and since this energy is taken from the flywheel, the slow down effect can be eliminated by increasing the flywheel speed by a proportional amount. After the inertia is overcome, the press speed must be maintained at its normal running level.
  • a mechanical press of the type described is characterised by first means activated only when the clutch is not energised for modifying the voltage supplied to the meter 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 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.
  • the press speed control and indication system of the present invention thus enables the press to be started and operated on its first stroke at its predetermined running speed by providing a control voltage to the speed control circuit that causes the flywheel to be rotated at a speed greater than its normal running speed when the clutch is de-energised.
  • the press will immediately drop to its normal running speed so that the proper speed will be realised on the first stroke of the slide.
  • the control voltage to the speed meter is modified so that it indicates a speed lower than the actual speed of the flywheel during the time that the clutch is de-energised.
  • the speed control voltage is modified so that the flywheel speed stays at the normal running speed, rather than increasing to the over speed condition as it otherwise would once the drive mechanism is accelerated.
  • the control voltage from the flywheel tachometer generator is no longer modified so that the meter reads the actual flywheel speed, which is now rotating at its predetermined running speed.
  • the first and second modifying means are variable resistors or potentiometers connected in parallel with respective relay contacts which are always in opposite states, that is to say when one is open, the other is closed, and vice versa.
  • the method of operating a press according to the present invention so as to control the speed of the flywheel and indicate to the press operatorthe speed thereof is thus 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.
  • FIG. 2 The speed control and indication system shown in Figure 2 is intended to be incorporated with a mechanical press 2 (Figure 1) which may be of the conventional variety, and includes a reciprocating slide 3 mechanically driven by a drive assembly 4, such as a crankshaft and connection assembly.
  • the crankshaft 5 is connected to a massive flywheel 6, which in turn is belt driven by an electric motor 7 through a variable speed drive mechanism 8.
  • the speed at which motor output shaft is driven may be controlled by an eddy current coupling.
  • the flywheel 6 is rotated continuously by the motor 7 at a speed selected by the press operator, and the crankshaft 5 is rotated only when a clutch 9 is energised thereby mechanically coupling the rotational energy of the flywheel 6 to the crankshaft 5, which in turn reciprocates the slide through the connections.
  • FIG. 2 the assembly of motor, clutch and flywheel indicated at 10 is controlled by a conventional speed control 12, whereby the flywheel 6 rotates continuously at the pre-set speed.
  • a control voltage for speed control 12 is derived from potentiometer 14 and connected to input 16 by line 18; terminal 17 and line 19 carry a bias voltage.
  • relay contacts 20 are closed by a flywheel coil 11 thereby shorting out a variable resistor or potentiometer 22 connected in series with the potentiometer 14 and applying to input 16 the appropriate voltage to cause speed control 12 to operate the motor 7 and flywheel 6 at an over-speed condition.
  • a higher than normal voltage will be applied to input 16 over line 18 with potentiometer 22 shorted out.
  • Tachometer generator 24 which is mechanically coupled to the flywheel 6, produces an output voltage on line 26 which is proportional to the actual speed of flywheel 6 which, when the flywheel 6 is running but the clutch 9 is not yet energised, will be higher than the normal operating speed of the press 2.
  • press speed meter 28 is caused to read the desired running speed of the press at all times, whether clutch 9 is energised or not.
  • This is accomplished by variable resistor or potentiometer 30 connected in parallel with normally open contacts 32 between the output 26 of tachometer generator 24 and the input 34 of speed meter 28. Contacts 32 are open when clutch 9 is de-energised and function to decrease the voltage at input 34 so that meter 28 will read low.
  • potentiometer 30 causes meter 28 to indicate to the operator that the press is set properly for an eventual press running speed at the desired level.
  • Potentiometer 22 is adjustable for the amount of inertial slow-down associated with the press 2, and potentiometer 14 is set for the proper over-speed level necessary to compensate for this inertial slow-down.
  • potentiometer 22 is shorted out and the high voltage on line 18 causes flywheel 6 to be rotated in an over-speed condition. Since contacts 32 are open, potentiometer 30 causes meter 28 to indicate the pre-set speed that the potentiometer 14 is set for.
  • relay contacts 20 are opened and relay contacts 32 are closed.
  • potentiometer 22 in series with line 18 so that a lower voltage is applied at input 16 thereby causing speed control 12 to run flywheel 6 at a lower speed, which speed is the normal running speed of the press that is desired for that particular operation. Since contacts 32 are now closed, potentiometer 30 is shorted out and meter 28 is controlled by the actual voltage developed on the output 26 of tachometer generator 24, which voltage corresponds to the actual running speed of flywheel 6.
  • the lower voltage input on line 18 causes press speed control 21 to maintain the speed of flywheel 6 at the slow-down level from that point on, rather than permitting the system to speed up again to its over speed condition.
  • meter 12 will always indicate the pre-set running speed of the press, regardless of whether flywheel 6 is rotating at its over speed or normal running speed. This makes it easy for the operator to see and adjust the actual speed of the press so that the proper continuous speed can be maintained once clutch 9 has been energised.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Press Drives And Press Lines (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Control Of Velocity Or Acceleration (AREA)

Claims (3)

1. Mechanische Presse mit einem hin- und hergehenden Schlitten (3), der von einem mechanischen Antrieb (4) angetrieben ist, mit einem Motor (7), der mit einem Schwungrad (6) zu dessen ständigen Umlauf in Triebverbindung steht, einer Kupplung (9) zum Übertragen der Drehbewegung des Schwungrades an den mechanischen Antrieb bei Eingriff der Kupplung, einer Geschwindigkeitsüberwachung zum Liefern einer variablen Drehzahlregelspannung zum Motor, um die Drehzahl des Schwungrades zu überwachen, und mit einem Tachogenerator (24), der mechanisch an das Schwungrad angekuppelt ist, um einer Drehzahl-Anzeigevorrichtung (28) eine Spannung zu liefern, die die Drehzahl des Schwungrades anzeigt, gekennzeichnet, durch erste Mittel (30, 32), die nur dann betätigt sind, wenn sich die Kupplung nicht im Eingriff befindet, um die der Anzeigevorrichtung (28) zugeführte Spannung zu verändern, damit die Anzeigevorrichtung eine vorgegebene normale Betriebsdrehzahl der Presse anzeigt, obgleich das Schwungrad bei einer höheren Drehzahl umläuft, als die normale Betriebsdrehzahl, und durch zweite Mittel (20, 22), die nur dann betätigt sind, wenn sich die Kupplung im Eingriff befindet, und die außer Betrieb die Drehzahlregelspannung einen solchen Wert annehmen lassen, um das Schwungrad bei höherer Drehzahl als seiner normalen Betriebsdrehzahl laufen zu lassen, die jedoch in betätigtem Zustand die Drehzahlregelspannung derart verändern, daß das Schwungrad mit der normalen Betriebsdrehzahl umläuft.
2. Presse nach Anspruch 1, dadurch gekennzeichnet, daß die ersten und die zweiten Beeinflussungsmittel variable Widerstände oder Potentiometer (22, 30) sind, die mit entsprechenden Relaiskontakten (20, 32), welche sich stets in entgegengesetzten Zuständen befinden, parallel geschaltet sind.
3. Verfahren zum Betreiben einer Presse gemäß Anspruch 1, um die Drehzahl des Schwungrades zu regeln und dem Pressen-Bedienungspersonal dessen Drehzahl anzuzeigen, dadurch gekennzeichnet, daß das Schwungrad bei höherer Geschwindigkeit als bei einer vorgegebenen normalen Betriebsgeschwindigkeit laufen gelassen wird, wenn sich die Kupplung außer Eingriff befindet, und das dann bei der vorgegebenen normalen Betriebsdrehzahl laufen gelassen wird, wenn sich die Kupplung im Eingriff befindet, und daß man die Anzeigevorrichtung dann die Schwungrad-Drehzahl als vorgegebene normale Betriebsdrehzahl anzeigen läßt, wenn sich sowohl die Kupplung außer Eingriff befindet und das Schwungrad bei höherer Drehzahl umläuft, als auch dann, wenn sich die Kupplung im Eingriff befindet und das Schwungrad mit der vorgegebenen normalen Betriebsdrehzahl umläuft.
EP19820304619 1981-09-08 1982-09-02 Geschwindigkeitsüberwachung einer Presse und Anzeigesystem Expired EP0074250B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29973581A 1981-09-08 1981-09-08
US299735 1981-09-08

Publications (3)

Publication Number Publication Date
EP0074250A2 EP0074250A2 (de) 1983-03-16
EP0074250A3 EP0074250A3 (en) 1984-05-09
EP0074250B1 true EP0074250B1 (de) 1986-07-23

Family

ID=23156066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820304619 Expired EP0074250B1 (de) 1981-09-08 1982-09-02 Geschwindigkeitsüberwachung einer Presse und Anzeigesystem

Country Status (5)

Country Link
EP (1) EP0074250B1 (de)
JP (1) JPS6018520B2 (de)
BR (1) BR8205272A (de)
CA (1) CA1178695A (de)
DE (1) DE3272145D1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2091747C (en) * 1992-03-16 1999-05-11 Keiichiro Hayashi Power transmission for mechanical press
CN102303419B (zh) * 2011-08-23 2013-12-18 山东理工大学 曲柄压力机工艺曲线的数控方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3407724A (en) * 1967-02-28 1968-10-29 Danly Machine Corp Power press acceleration control system

Also Published As

Publication number Publication date
EP0074250A3 (en) 1984-05-09
CA1178695A (en) 1984-11-27
DE3272145D1 (en) 1986-08-28
JPS5884698A (ja) 1983-05-20
JPS6018520B2 (ja) 1985-05-10
EP0074250A2 (de) 1983-03-16
BR8205272A (pt) 1983-08-16

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