US3841143A - Apparatus for controlling the actuation of an accessory device in an oil pressure actuated press - Google Patents

Apparatus for controlling the actuation of an accessory device in an oil pressure actuated press Download PDF

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Publication number
US3841143A
US3841143A US00346908A US34690873A US3841143A US 3841143 A US3841143 A US 3841143A US 00346908 A US00346908 A US 00346908A US 34690873 A US34690873 A US 34690873A US 3841143 A US3841143 A US 3841143A
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United States
Prior art keywords
slide
press
accessory device
limit switches
variable
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 - Lifetime
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US00346908A
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English (en)
Inventor
S Harada
M Kuroyanagi
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Aida Engineering Ltd
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Aida Engineering Ltd
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Filing date
Publication date
Application filed by Aida Engineering Ltd filed Critical Aida Engineering Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses

Definitions

  • the press is of the type which comprises a pair of limit switches operable at the upper and lower limits of the stroke of a slide,
  • the apparatus of the invention constitutes a power source, a stationary; variable resistance connected to the power source, a stationary contact which engages the variable resistance and islikewise connected to the power source, with the position of the stationary contact being variable in response to a change in the operative position of the limit switch of the press, a shifting contact further being disposed in engagement with the variable resistance, and Schmidt trigger circuits having inputs connected to the shifting contacts and outputs connected to a press accessory device actuating mechanism.
  • This invention relates generally to an oil pressureactuated press and more particularly, to an apparatus for controlling the actuation of an accessory device of the press such as a material or product feed device, a scrap cutter, a product knock'out device or an air ejector, for example, in such a manner that the accessory device can be actuatedin a predetermined phase in the slide stroke even when the stroke distance is varied.
  • an accessory device of the press such as a material or product feed device, a scrap cutter, a product knock'out device or an air ejector, for example, in such a manner that the accessory device can be actuatedin a predetermined phase in the slide stroke even when the stroke distance is varied.
  • one principal object ofthe present invention is to provide an apparatus for controlling the actuation of an accessory device in an oil pressure-actuated press which can effectively eliminate the disadvantages inherent in the prior art apparatus for controlling the actuation of an accessory device in an oil pressureactuated press referred to hereinabove.
  • Another object of the present invention is to provide an apparatus forcontrolling the actuation of an accessory device-inan oil pressure-actuated press which can control the actuation of the'accessory device without the necessity for varing thepositiori of the-limit switch or switches even when thestroke distance of the slide is varied.
  • a further object of the present invention is to provide an apparatus for controlling the actuation of an accessory device in an oil pressure-actuated press which can eliminate the necessity for re-positioning or, adjusting the position of the limit switch or switches even when dies having different-heights are employed.
  • an oil pressureactuated' press has'be'en provided which comprises a pair of limit switches adapted .to be operated'at the. upper and-lower limits -of the stroke of 'a' slide,'respec-. tively, for 'con'trollin'g an .oilpressure controlling electromagnetic" valve associated :with an oil; pressureoperjated cylinder that is adapted to operate said slide and in which;the operative position of at. leastoneof said limit switches is v'ariableso as to vary the stroke distanceof said slide, characterized in' thatan appara-.
  • FIG. 1 is a diagram showing the stroke of the slide in an oil pressure-actuated press
  • FIG; 2 is a schematic view in partial section of one preferred'embodiment of apparatus for controlling the actuation of a device accessory to an oil pressureaccordance with the present inven- PREF RRED EMBODIMENT OF THE INVENTION
  • numeral 1 denotes the main frame'of an oil pressure-actuated press
  • numeral 2 denotes the bolster fixedly secured "to the main frame
  • numeral 3 denotes the slide.
  • the boltster 2 and slide 3 have mating dies mounted thereon, respectively, which cooperate with each other in performing a processing operation on a work piece (not shown).
  • the slide 3 is fixedly secured to the upper end of a support member 6; the lower end of whichhas an integral piston 5 receivedinan pressure oil cylinder 4.
  • the worm wheel 7 is in tum-meshing with a warm 9 which is adapted to be rotated by means of a motor 10 which is also suitably mounted on the main frame 1.
  • a substantially L-shaped support rod 18 is fixedly secured to and horizontally and: vertically from one side of the cylinder 4 the left-hand side as seen in FIG. 2 and the vertical'extension of the support rod 18 has at the upper end a plate cam 19 secured theretofor detecting the upper limit of the slide stroke in cooperation with the-limit switch 17 whenthe limit switch 17 engagesthe cam plate as the slide reaches the upper limit of its stroke.
  • a further support rod 20 extends horizontally from the other side of the slide 3 and has at the free or outer end a limit switch 21 fixedly secured thereto.
  • the support rod 20 has an upwardly extending extension for thepurpose to be described hereinbelow.
  • the limit switch 21 is adapted to be engaged by a plate cam 22 at the upper end of a vertical support rod 23 or more particularly, on one of two upper extensions of the rod 23 for detecting the lower limit of the slide stroke, and the support rod 23 has an external thread on the lower end portion in engagement with an internally threaded cylindrical member 26 rotatably received in a ring member 25 which is provided in the horizontal arm of a substantially L-shaped support rod 24 which extends horizontally from the other side of the cylinder 4 and then upwardly.
  • the threaded cylindrical member 26 is adapted to be rotated by a motor 27 to adjust the position of the plate cam 22 andaccordingly, the lower limit'of the slide stroke thereby to vary the distance of the slide stroke.
  • the abovementioned limit switches 17 and 21 are connected to the above-mentioned electromagnetic valve.15by
  • the vertical extension 24' of the above-mentioned support rod 24 has an inwardly extending extension from which a variable electric resistance VR suspends vertically and the resistance is adapted to be engaged on one side by a stationary-contact 30 supported on the other extension of the above-mentioned-cam supportrod 23.
  • the other side of the resistance VR is adapted to be engaged by a shifting contact 31 supported at the extreme end of the upwardly extending extension of the support rod 2(lon which the switch 21 is supported.
  • the variable resistance VR and contacts 30,31 cooperate with a power source of direct current, E in providing an electric circuit as shown in FIG. 3 in which the shifting contact 31 is selectively connected to the in- I puts of a plurality of Schmidt trigger circuits S S S S 8,, and the outputs of which are connected to an actuation means of the press accessory device (not shown).
  • Schmidt trigger circuits 8,, S S S, S are, respectively, set to be operated when, for example, the inputvoltage of the shifting contact-31 is at 2 V, 2.5V, 5 V, 6.5 V. 8 V, respectively.
  • These Schmidt trigger circuits are of conventional, well-known construction.
  • the slide 3 moves describing the curve a as shown in FIG. 1, the voltage at the variable resistance VR varies within the range2V 8V as the shifting contact 31 shifts along the resistance VR and signal for actuating the accessory press device are generated in the middle points a and a of the slide stroke distance, the voltage at the resistance VR is 5V when the actuation signals are generated.
  • the threaded cylind'rical member 26 is -rotated by the motor 27 to raise the lower limit detectioncam plate 22 by 100 mm.
  • the upward movement of thelower limit cam plate 22 by the above-mentioned distance inturn varies the effective resistance "value of the variable resistance VR whereby the voltage range of 2V 8V can be obtained within the slide stroke distance of 100 mm. Therefore, even if the slide stroke distance is varied from 200 mm to 100 mm and the slide moves describing the curve b as shown in FIG. 1, when the slide reaches the middle points 12, and b of the slide stroke distance, the Schmidt trigger circuit S set for operation at 5V pro- .vides signals for actuating the press accessory device.
  • an oil pressure-actuated press which comprises a pair of limit switches for operating at the upper and lower limits of the stroke of a slide, respectively, for controlling an oil pressure controlling electromagnetic valve associated with a pressurized oil cylinder which operates said slide and in which the operative position of at least one of said limit switches is variable so as to vary the stroke distance of said slide
  • the improvement comprising an apparatus for controlling the actuation of an accessory device in said press, said apparatus comprising a power source, a stationary variable resistance connected-to one terminal of said power source, a stationary contact engaging said variable resistance and connected to the other terminal of said power source, the position of said stationary contact being variable in response to change in said operative position of at least one of said limit switches, a shifting I contact in engagement with said variable resistance and Schmidt trigger circuits having inputs connected to said 6 position of said pressurized oil cylinder is vertically adjustable in accordance with the height of particular dies employed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Presses (AREA)
  • Control Of Position Or Direction (AREA)
  • Press Drives And Press Lines (AREA)
US00346908A 1972-08-31 1973-04-02 Apparatus for controlling the actuation of an accessory device in an oil pressure actuated press Expired - Lifetime US3841143A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8660272A JPS5417196B2 (enExample) 1972-08-31 1972-08-31

Publications (1)

Publication Number Publication Date
US3841143A true US3841143A (en) 1974-10-15

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Application Number Title Priority Date Filing Date
US00346908A Expired - Lifetime US3841143A (en) 1972-08-31 1973-04-02 Apparatus for controlling the actuation of an accessory device in an oil pressure actuated press

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US (1) US3841143A (enExample)
JP (1) JPS5417196B2 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4309893A (en) * 1979-08-27 1982-01-12 Rexnord Inc. Plug-shaped press crown for a press assembly
US4796456A (en) * 1986-01-02 1989-01-10 Sms Hasenclever Maschinenfabrik Gmbh Forging machine
US4831864A (en) * 1986-01-02 1989-05-23 Sms Hasenclever Machinenfabrik Gmbh Forging machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2782831A (en) * 1955-06-15 1957-02-26 Gen Electric Automatic gauge for press brakes
US2926497A (en) * 1957-06-13 1960-03-01 Schoemann Ag Controlling means for attaining equal speeds of two pistons working against resistances
US3016005A (en) * 1956-01-05 1962-01-09 Elmes & King Mfg Company Hydraulic press
US3031903A (en) * 1958-05-12 1962-05-01 Schloemann Ag Control of hydraulic forging presses

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2782831A (en) * 1955-06-15 1957-02-26 Gen Electric Automatic gauge for press brakes
US3016005A (en) * 1956-01-05 1962-01-09 Elmes & King Mfg Company Hydraulic press
US2926497A (en) * 1957-06-13 1960-03-01 Schoemann Ag Controlling means for attaining equal speeds of two pistons working against resistances
US3031903A (en) * 1958-05-12 1962-05-01 Schloemann Ag Control of hydraulic forging presses

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4309893A (en) * 1979-08-27 1982-01-12 Rexnord Inc. Plug-shaped press crown for a press assembly
US4796456A (en) * 1986-01-02 1989-01-10 Sms Hasenclever Maschinenfabrik Gmbh Forging machine
US4831864A (en) * 1986-01-02 1989-05-23 Sms Hasenclever Machinenfabrik Gmbh Forging machine

Also Published As

Publication number Publication date
JPS5417196B2 (enExample) 1979-06-28
DE2342098A1 (de) 1974-03-21
JPS4943273A (enExample) 1974-04-23
DE2342098B2 (de) 1975-11-20

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