US3468243A - Device for compensating the weight of the heating plates in multistage presses with simultaneous closing mechanism - Google Patents

Device for compensating the weight of the heating plates in multistage presses with simultaneous closing mechanism Download PDF

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Publication number
US3468243A
US3468243A US605642A US3468243DA US3468243A US 3468243 A US3468243 A US 3468243A US 605642 A US605642 A US 605642A US 3468243D A US3468243D A US 3468243DA US 3468243 A US3468243 A US 3468243A
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US
United States
Prior art keywords
press
piston
weight
compensating
plates
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Expired - Lifetime
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US605642A
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English (en)
Inventor
Fritz Schneider
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NIEDERRHEINISCHE MAS FAB BACKE
Niederrheinische Mas Fab Backer & Van Hullen
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NIEDERRHEINISCHE MAS FAB BACKE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B7/00—Presses characterised by a particular arrangement of the pressing members
    • B30B7/02—Presses characterised by a particular arrangement of the pressing members having several platens arranged one above the other

Definitions

  • a device for compensating the weight of the heating plates in a multi-stage press with a simultaneous closing mechanism comprising a plurality of press plates vertically displaceable in the frame, a pair of fork-like arms, each pivoted to the frame, and rods pivoted to the arms and to the press table.
  • Tension members are pivoted to the arms and to the press plates.
  • the tension members are constituted by pneumatic work-cylinders having enlarged and reduced cylinder portions. Supply conduits for the pressure medium and adjusting valves are provided.
  • the present invention relates to a device for compensating the weight of the heating plates in a multistage press with simultaneous closing mechanism.
  • the known art has developed mechanisms of Widely varying constructions for the simultaneous opening and closing of all stages of multi-stage presses.
  • these constructions the most successful comprises on two op posite sides on the upper press stay always one arm aranged to pivot about a horizontal axis, and on the lower liftable and lowerable stay (press table) a push rod, articulately engaging the free end of the associated pivoting arm, and wherein the individual stage plates are articulately connected with the pivoting arms by means of tension members.
  • These tension members engage the associated pivoting arm in the sequence of the stage plates, taken from the top towards the bottom, in proportionally increasing distances.
  • each of the said tension members between the stage plate and the associated pivoting arm with a hydraulic balancing mechanism.
  • a hydraulic balancing mecha- 3,468,243 Patented Sept. 23, 1969 nism consists of a working cylinder and a hollow piston, wherein the hollow piston is affected by a hydraulic medium only in the direction towards the associated pivoting arm and is also equipped with a bottom-fitted bush for the enlarged upper end of the tension member.
  • the invention based on such a known multistage press, has the object of providing such a device for compensating the weight of the heating plates such that the operation of the press is possible even if the lowermost stage is occupied.
  • this object may be realized in that there is provided for the hollow piston a hydraulic abutment in the form of a piston which may carry out a limited movement in the working cylinder, and in that this abutment may be rendered inoperative during the closure of the press and during the actual pressing.
  • the working cylinder is a stepped cylinder, wherein the shoulder forms the limit stop for the piston serving as counterabutment.
  • the effective surface of the counter-abutment piston is larger than that of the hollow piston.
  • both pistons can be actuated under the same pressure from a common oil accumulator.
  • the effective force thereof is larger in the engaged condition, so that the counter-abutment piston cannot be forced away from the hollow piston.
  • this design requires two conduits for the hydraulic medium for the pressure chamber of the counter-abutment, namely a feed and a return conduit, adapted to be closed by valves.
  • these valves will have the form of magnetic valves.
  • FIG. 1 is a partly sectionalized front elevation of the press, shown in the left half of the drawing in the open state and in the right half in the closed state;
  • FIG. 2 is a side elevation of the press in the open state
  • FIG. 3 is an axial cross-section of a hydraulic working cylinder of a balancing device with counter-abutment piston.
  • the upper press stay 2 is fixed stationarily to a main frame 1, and the lower stay, forming a press table 3, is mounted so that it can be raised and lowered, as known in the art; hydraulic cylinders 4 are provided for the upwardly directed working stroke of the press table 3, and its subsequent return for opening the press.
  • the reference numerals, 5, 6a, 6b, 6c, 6d. 7 signify the plates of the individual press stages the plates with the press in open condition and 6 and 7, the plates with the press in closed condition, and the reference numerals 6a.
  • the drawing shows only six such press stages, whilst in practice their number may exceed twenty.
  • the top plate 5 of the uppermost stage is connected rigidly with the upper stay 2, and the bottom plate '8 of the lowermost stage rigidly with the press table 3.
  • the stay 2 carries two fork-like arms 9, each pivotable about a horizontal axis 10.
  • a rigid rod 12 is artieulately connected with the free end of each arm 9 as at 11, and its lower end is articulated as at 13 to the press table.
  • Each tension rod 14 has a tightener or like device 16, enabling it to be adjusted to its exact constructional length, as well as a balancing device, shown generally at 17.
  • the piston-shaped enlarged upper end 18 of each rod 14 is guided in a bush-like cavity 19 of a piston 20 (FIG. 3).
  • the said piston 20 is mounted displaceably in a working cylinder 21 and passes with its lower portion 20a, forming the guide for the associated rod 14, through the lower end wall 21a of the cylinder 21.
  • the upper end wall 21b of the cylinder carries an eyelet 22, by means of which the cylinder 21, and thus also the rod 14, connected therewith via the hollow piston 20 and the rod end 18, is articulately connected at 23 with the associateed pivot arm 9 (see FIG. 1).
  • the hollow piston 20 forms a shoulder 20b, on which the piston-shaped upper end 18 of the rod 14 normally rests.
  • the working chamber 210 of the cylinder 21, left free by the piston 20, may be affected by a hydraulic medium via a conduit 24, so that the medium act from the bottom, i.e., in the direction towards the associated pivoting arm 9, on the piston 20. It may be easily achieved by suitable piston seals 25 that the hydraulic medium cannot escape either towards the top into the cavity 19, or towards the bottom from the working chamber of the cylinder 21.
  • the working cylinder 21 is a stepped cylinder so that its upper portion forms a working chamber 21d with a larger cross-section than the chamber 210.
  • a piston 26 is guided in this portion 21d and forms a counter-abutment for the hollow piston 20.
  • the working chamber 21d communicates with a conduit 27 which forks into a part 27a and a part 27b.
  • a valve 28a and 2811 respectively, for example, in the form of a magnetic valve.
  • the. balancing mechanism 17 is switched by means of a control device, not shown.
  • the valve 28a closes and the valve 28b opens so that the press chamber 21d is depressurized and the counter-abutment becomes ineffective. This releases the fixing of the piston 20 and the same assumes in each case a position in which the piston-like ends 18 of the rods 14 rest on the shoulder 20b of the piston 20, causing the weight of the heating plates to be fully balanced.
  • the counter-abutment is again actuated by pressurizing the piston 26, whereby the simultaneous opening of the press is assured.
  • a device for compensating the weight of the heating plates in a multistage press with simultaneous closing mechanism comprising a press frame, a vertically displaceable press table in said press frame, means for vertically displacing said press table, a plurality of press plates vertically displaceable in said frame, a pair of forklike arms, each pivoted with one of its ends about a horizontal axis to opposite sides of said frame, a pair of rigid rods pivoted with one of their ends to the free ends of said arms, respectively, and with their other ends to opposite ends of said press table, a plurality of tension members spacedly pivoted with upper ends to the respective arms and with their lower ends to the press plates, said tension members comprising a rod having an upper piston-shaped enlarged end, a work cylinder having a reduced lower portion and an enlarged upper portion, a hollow piston slidable in said reduced lower portion and forming a first chamber therewith and having a bush-like portion extending through the bottom wall of said cylinder for guiding said piston-shaped end of said rod

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US605642A 1966-01-03 1966-12-29 Device for compensating the weight of the heating plates in multistage presses with simultaneous closing mechanism Expired - Lifetime US3468243A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1966N0027840 DE1239945C2 (de) 1966-01-03 1966-01-03 Einrichtung zum auskompensieren des heizplattengewichtes bei einer mehretagenpresse mit simultanschliessvorrichtung

Publications (1)

Publication Number Publication Date
US3468243A true US3468243A (en) 1969-09-23

Family

ID=7344422

Family Applications (1)

Application Number Title Priority Date Filing Date
US605642A Expired - Lifetime US3468243A (en) 1966-01-03 1966-12-29 Device for compensating the weight of the heating plates in multistage presses with simultaneous closing mechanism

Country Status (9)

Country Link
US (1) US3468243A (xx)
AT (1) AT266425B (xx)
BE (1) BE691852A (xx)
CH (1) CH451709A (xx)
DE (1) DE1239945C2 (xx)
DK (1) DK115666B (xx)
FI (1) FI42667B (xx)
FR (1) FR1507035A (xx)
GB (1) GB1126726A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518724A (en) * 1967-03-28 1970-07-07 Motala Verkstad Ab Means for closing and opening multiplaten presses
EP0972636A2 (de) * 1998-07-13 2000-01-19 Robert Bürkle GmbH Mehretagenpresse für laminierte Plastikkarten
DE202008009719U1 (de) 2008-07-18 2008-09-25 Robert Bürkle GmbH Mehretagen-Laminierpresse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111300801A (zh) * 2020-02-25 2020-06-19 重庆工业职业技术学院 一种多工位高分子真空热压机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913027A (en) * 1958-04-09 1959-11-17 Washington Iron Works Simultaneous-acting multi-platen hot press
FR1419334A (fr) * 1964-04-24 1965-11-26 Becker & Van Huellen Presse à plusieurs étages, dont les étages doivent s'ouvrir et se fermer ensemble
US3361056A (en) * 1964-06-12 1968-01-02 Motala Verkstad Ab Device for obtaining a simultaneous movement and balancing of the pressplatens in a multi-platen hot press

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913027A (en) * 1958-04-09 1959-11-17 Washington Iron Works Simultaneous-acting multi-platen hot press
FR1419334A (fr) * 1964-04-24 1965-11-26 Becker & Van Huellen Presse à plusieurs étages, dont les étages doivent s'ouvrir et se fermer ensemble
US3361056A (en) * 1964-06-12 1968-01-02 Motala Verkstad Ab Device for obtaining a simultaneous movement and balancing of the pressplatens in a multi-platen hot press

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518724A (en) * 1967-03-28 1970-07-07 Motala Verkstad Ab Means for closing and opening multiplaten presses
EP0972636A2 (de) * 1998-07-13 2000-01-19 Robert Bürkle GmbH Mehretagenpresse für laminierte Plastikkarten
EP0972636A3 (de) * 1998-07-13 2001-05-02 Robert Bürkle GmbH Mehretagenpresse für laminierte Plastikkarten
DE202008009719U1 (de) 2008-07-18 2008-09-25 Robert Bürkle GmbH Mehretagen-Laminierpresse
EP2145753A2 (de) 2008-07-18 2010-01-20 Robert Bürkle GmbH Mehretagen-Laminierpresse

Also Published As

Publication number Publication date
DE1239945B (de) 1967-05-03
DE1239945C2 (de) 1980-11-20
BE691852A (xx) 1967-05-29
GB1126726A (en) 1968-09-11
AT266425B (de) 1968-11-11
DK115666B (da) 1969-10-27
FR1507035A (fr) 1967-12-22
FI42667B (xx) 1970-06-01
CH451709A (de) 1968-05-15

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