EP0369901A1 - Verbesserte Biegepresse mit zwischenliegenden Scharnieren - Google Patents

Verbesserte Biegepresse mit zwischenliegenden Scharnieren Download PDF

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Publication number
EP0369901A1
EP0369901A1 EP89420433A EP89420433A EP0369901A1 EP 0369901 A1 EP0369901 A1 EP 0369901A1 EP 89420433 A EP89420433 A EP 89420433A EP 89420433 A EP89420433 A EP 89420433A EP 0369901 A1 EP0369901 A1 EP 0369901A1
Authority
EP
European Patent Office
Prior art keywords
deck
apron
support
rotation
face
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.)
Withdrawn
Application number
EP89420433A
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English (en)
French (fr)
Inventor
Pierre Guepratte
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0369901A1 publication Critical patent/EP0369901A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • B21D5/042—With a rotational movement of the bending blade

Definitions

  • the present invention relates to folding machines generally used as zinc plating tools and used to bend a plate such as a sheet of thickness of the order of 0.5 to 1 mm along a rectilinear fold line.
  • Known folding machines traditionally comprise a frame with a fixed horizontal support table limited by a rectilinear table edge, and an apron provided with a flat bearing face limited by a rectilinear apron edge.
  • the deck is articulated on the support table by an articulation with a longitudinal axis shaped so that the straight edge of the deck remains in the vicinity of the straight edge of the table during the rotation of the deck.
  • Counterweight means make it possible to balance the weight of the deck when it rotates about its axis.
  • a rectilinear corner piece constituting a shape around which the sheet is wound during bending, is carried by the frame and is movable by the user between a folding position in which the corner piece is held in the vicinity of the rectilinear edge of table inside the dihedral formed by the table and the apron, and a position of withdrawal in which the corner piece is retracted to allow the insertion of the sheet to be folded.
  • the deck is articulated according to two end shafts arranged at the two ends of the straight edge of the table. It is understood that, during the folding of a sheet, the folding forces are distributed all along the deck, while the maintenance of the deck is ensured only at its two ends. This results in a tendency for the deck to buckle, since its intermediate portions are not held relative to the table.
  • the document EP-A-0 092 943 describes folding hinges comprising sorts of oblique parts, forming relatively complex structures.
  • document FR-A-2 422 456 describes a folding machine provided with intermediate hinges with rotary and sliding rods on cams; the inevitable games in connecting rod systems make such a structure ineffective in the long term, and lead to significantly increase the cost of assembling the folder.
  • the document CH-A-475 803 describes a hinge structure for a folding machine, making it possible to pivot the deck around a virtual axis, thanks to a set of connecting rods.
  • the structure described is even more complex, and leads to very high production and assembly costs; in addition, the games inevitably appearing at the joints make this structure ineffective in the long term.
  • the document CH-A-371 421 further describes holding means, complementary to the articulation with semi-cylindrical axis and housing, for holding the deck during pivotings greater than 90 °: these means comprise a chain, one end of which is integral with the deck and the other end of which is held elastically on the table by means of a spring.
  • the spring is necessary to allow the pivoting of the deck.
  • the effect obtained by these means is an elastic traction from the deck towards the table, the elastic traction tending to oppose the bending reaction forces and to reduce buckling of the apron.
  • it is an elastic hold, which only partially opposes the bending forces, and the hold force obtained strongly depends on the pivot angle of the deck, and is highly variable as a function of this angle. . Such support is insufficient to prevent buckling of the deck.
  • the object of the present invention is to distribute the efforts to maintain the folding apron at several points along its length, while maintaining it rigidly by suitable devices at one or more intermediate points relative to the folding table.
  • the holding devices are compatible with the particular rotational movements of the deck, and with the passage of the sheet, and these means avoid marking the sheet during folding.
  • Another object of the invention is to ensure the rigid support of the deck by its straight edge in the vicinity of the straight table edge during its entire rotational movement, said rotation possibly having an amplitude of up to 135 °.
  • the means of the invention make it possible, by using simple, robust and inexpensive mechanical solutions, a long length folding machine without having to oversize the deck and the counterweights. This results in greater simplicity of manufacture, and a significant reduction in the cost of production of such a folder.
  • the folding machine comprises the essential organs of a traditional folding machine, namely a frame with fixed support table limited by a straight table edge, an apron provided with a flat face. support limited by a straight edge of the deck.
  • the deck is articulated on the support table according to two end shafts arranged at the ends of the straight table edge, and is connected to the table by at least one holding device, arranged in an intermediate position between the two table ends, ensuring maintaining the corresponding intermediate portion of rectilinear edge of the deck in the vicinity of the corresponding intermediate portion of rectilinear edge of the table, against the buckling forces exerted on the deck by the sheet during bending.
  • the holding device is such that: a support piece, integral with the support table, comprises a semi-cylindrical upper recess of revolution coaxial with the axis of rotation of the deck, and is limited by a planar upper face coplanar with the bearing face of the support table, the support part being partly projecting in front of the straight edge of the support table; -
  • a semi-cylindrical shaft, integral with the deck and coaxial with the axis of rotation of the deck is limited by a plane longitudinal face coplanar with the bearing face of the deck, and is shaped to adapt to low clearance in the 'upper semi-cylindrical recess of the support part;
  • the protruding part of the support piece engages in an apron light provided for this purpose, during the rotation of the apron, the apron light being closed on one side by the semi-cylindrical apron shaft.
  • the holding device further comprises a holding arc comprising an arc-shaped body connecting two support heads, the arc body passing through a lumen of the deck and a corresponding lumen of the front wall of table.
  • the first head of the arch bears against an upper face of the apron opposite the straight folding edge of the apron.
  • the second head of the arch comes to rest against a table underside opposite the rectilinear table edge.
  • the heads of the retaining arc advantageously consist of cylinders whose axis is substantially parallel to the axis of rotation of the deck, so as to define bearing surfaces whose dimension is large, to distribute the mechanical stresses between the heads and the elements on which they are based.
  • guide rods can be provided under the table and on the upper face of the deck, to guide the heads of the retaining arc when the deck is lowered.
  • the folding machine comprises a frame 1 supporting a folding table 2.
  • the folding table 2 consists of a strong metal L-shaped angle forming a flat upper surface 3 of folding limited by an edge table rectilinear 4.
  • the second element 5 of the table forms an anterior vertical wall bounded by the same table edge 4, the assembly being fixed to the frame 1.
  • An apron 6, formed of a U-shaped angle iron, comprises a plate plane 7 limited by a straight edge of the deck 8, and connecting to a second wall 9 perpendicular to the first wall 7 and whose external face 10 forms the flat bearing face of the deck.
  • the apron 6 is articulated according to two end shafts 100 and 200 arranged at the two ends of the straight edge 4 of the table, and positioned so that the apron can rotate around the end shafts, the straight edge 8 of the apron being kept at near the rectilinear edge 4 of the table.
  • An apron lever 11 makes it possible to manipulate the apron to rotate it around its rotation shafts, and end counterweights 12 and 13 make it possible to balance the weight of the apron and reduce the effort which the user must provide to operate the deck.
  • the corner piece is movable by the user, and is worn for this on a frame 15 articulated along an axis of rotation 16 on the frame 1 of the folder.
  • Counterweights such as the counterweight 17 balance the weight of the corner piece 14, and facilitate its operation by the user.
  • the corner piece 14 can be moved by the user between a folding position, shown in solid lines in FIG. 1, in which the corner piece is in the vicinity of the straight edge 4 of the table inside the dihedron formed by the bearing face 3 of the table and the bearing face 10 of the deck, and a withdrawal position shown in phantom in Figure 1, in which the corner piece 14 is retracted to allow the insertion of the sheet to be folded .
  • the device is shown in the sheet metal insertion position, position in which the deck 6 is lowered so that its bearing face 10 is in line with the upper face 3 of the table support 2.
  • a sheet can be freely inserted in a horizontal position on the flat face formed by the assembly of the table 2 and the second wall 9 of the deck.
  • the corner piece 14 is raised, as shown in the figure, in phantom.
  • the folder has been shown during its operation to fold a sheet metal 18.
  • the user pushes the lever 11 upwards, to rotate the deck 6 around its axis of rotation, the bearing face 10 of the deck 6 coming to bear against the sheet 18 to fold it around the corner piece 14.
  • this reaction force 19 produces the buckling of the deck, and its deformation in its central area.
  • the present invention provides one or more intermediate holding devices, distributed in one or more intermediate positions between the two ends of the deck.
  • Figure 3 there is shown in front view a folder according to the present invention provided with three intermediate holding devices 20, 21, and 22 arranged respectively at quarter, half and three quarters of the length of the apron 6.
  • each holding device comprises on the one hand a sub-assembly carrying out a hinge, and on the other hand a sub-assembly ensuring the maintenance when the deck is in the vicinity of its maximum folding position.
  • Figures 5 and 6 illustrate, in cross section along the axis I - I of Figure 4, the bodies constituting the hinge means 23.
  • a support piece 25 integral with the support table 2 and cutting the rectilinear edge of the table, comprising a semi-cylindrical upper recess 26 of revolution coaxial with the axis of rotation of the deck 6 or, which amounts to the same , coaxial with the straight edge 4 of the support table 2.
  • the support part 25 is limited by a flat upper face 27 coplanar with the support surface 3 of the support table 2.
  • the support part 25 is partly projecting, along its portion 28 , in front of the straight edge 4 of the support table 2.
  • the shaft 29 is shaped to journal with little play in the semi-cylindrical upper recess 26 of the support part 25.
  • the protruding part 28 of the support piece 25 engages in an apron opening 31 provided for this purpose, during the rotation of the apron, and in particular when the apron 6 is lowered as shown in FIG. 5.
  • the opening 31 is closed on one side by the semi-cylindrical shaft 29 of the deck.
  • the hinge means 23 are associated with holding means 24, shown in cross section along the plane II - II in FIGS. 7 and 8. The holding means 24 are arranged in the vicinity of the hinge means 23, and take over to resume the folding forces at the end of folding, when the hinge means 23 are no longer sufficient to hold the deck 6 relative to the table 2 .
  • the holding means 24 mainly comprise a holding arc 32, comprising a body 33 in the form of an arc, substantially in a semicircle, connecting two support heads 34 and 35.
  • the body 33 of the arch 32 passes through an opening 36 in the deck and a corresponding opening 37 in the front wall 5 of the table.
  • the first head 34 is intended to come to bear against an external face 38 of the apron opposite the straight edge 8 of the apron.
  • the second head 35 is intended to come into abutment against a lower face 39 of the table opposite the rectilinear edge 4 of the table.
  • the heads 34 and 35 are cylindrical elements with an axis substantially parallel to the axis of rotation of the deck, each head forming a T relative to the body 33 of the arc.
  • Two apron guide rods 40 and 41 substantially parallel to its bearing face 10, hold the head 34 in the vicinity of the face 38 of the apron, while allowing a translation of the head 34 along the face 38 of the apron , the body 33 of the arc passing between the two rods 40 and 41.
  • two similar table guide rods such as the rod 42, substantially parallel to the support face 3 of the table, maintain and guiding the head 35 in the vicinity of the table surface 39, while allowing translation of the head 35 along the underside of the table.
  • the operation of the device is as follows: in the vicinity of the rest position, shown in FIG. 7, the arc 32 has no action for maintaining the deck 6 against the table 2.
  • the head 34 when one causes the rotation of the deck 6 around its axis, the head 34 gradually comes to bear against the external face 38 of the deck, while head 35 comes gradually to bear against the underside 39 of the table.
  • the arc 32 is shaped so that, from the position in which the support face 10 of the deck is in a vertical position as shown in FIG. 8, the arc 32 ensures the rigid, non-elastic retention of the edge straight 8 of apron near the straight edge 4 of table.
  • the shape of the surfaces 38 and 39 must be adjusted to ensure correct maintenance, within acceptable tolerances, of the apron with respect to the table during the entire rotation of the apron between the position shown in FIG. 8 and the extreme folding position shown on Figure 2.
  • the surfaces 38 and 39 form cams to ensure the support of the heads 34 and 35 and balance the forces as a function of the angle of rotation of the deck. It can be considered that the cams modify the apparent length of the retaining arc 32, or move the axis of rotation of the apron 6, during the rotation of said apron 6 from 90 ° to 135 °, to oppose the forces bending reaction and to compensate for the resulting deformations.
  • the head 34 has a substantially circular section and pivots in a similar external surface 38 of substantially circular section; on the other hand, the lower surface 39 is substantially planar and inclined at an angle A relative to the horizontal, as shown, and the head 35 has a substantially planar support facet 50.
  • the support facet 50 is oriented relative to the body 33 of the arc 32 in such a way that it is parallel to the lower surface 39 when the deck 6 occupies the intermediate position shown in FIG.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP89420433A 1988-11-14 1989-11-09 Verbesserte Biegepresse mit zwischenliegenden Scharnieren Withdrawn EP0369901A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8815305 1988-11-14
FR8815305A FR2638985A1 (fr) 1988-11-14 1988-11-14 Plieuse perfectionnee a charnieres intermediaires

Publications (1)

Publication Number Publication Date
EP0369901A1 true EP0369901A1 (de) 1990-05-23

Family

ID=9372177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89420433A Withdrawn EP0369901A1 (de) 1988-11-14 1989-11-09 Verbesserte Biegepresse mit zwischenliegenden Scharnieren

Country Status (2)

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EP (1) EP0369901A1 (de)
FR (1) FR2638985A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1057549A3 (de) * 1999-06-03 2003-03-12 SALVAGNINI ITALIA S.p.A. Biegemaschine für Blech mit hohen Seiten
FR2852534A1 (fr) * 2003-03-17 2004-09-24 Jouanel Ind Plieuse de tole
CN114700397A (zh) * 2022-04-26 2022-07-05 安徽玖曼智能装备有限公司 一种折弯机用带有挡料机构的递料装置及其实施方法
CN115055553A (zh) * 2022-06-29 2022-09-16 中建八局轨道交通建设有限公司 一种弯折装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE161949C (de) *
CH371421A (de) * 1961-12-19 1963-08-31 Thalmann Otto Vorrichtung zum Abkanten von Blech
CH400065A (de) * 1963-03-21 1965-10-15 Puell Werner Von Biegeeinrichtung für lange dünne Bleche
CH475803A (de) * 1968-10-04 1969-07-31 Mueller Willi Abkantmaschine
FR2422456A1 (fr) * 1978-04-11 1979-11-09 Bullani Livio Plieuse, particulierement pour le pliage de toles de grandes dimensions
EP0092943A1 (de) * 1982-04-14 1983-11-02 Magnetic Engineering Pty. Ltd. Scharniere und gelenkig verbundene Waren

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE161949C (de) *
CH371421A (de) * 1961-12-19 1963-08-31 Thalmann Otto Vorrichtung zum Abkanten von Blech
CH400065A (de) * 1963-03-21 1965-10-15 Puell Werner Von Biegeeinrichtung für lange dünne Bleche
CH475803A (de) * 1968-10-04 1969-07-31 Mueller Willi Abkantmaschine
FR2422456A1 (fr) * 1978-04-11 1979-11-09 Bullani Livio Plieuse, particulierement pour le pliage de toles de grandes dimensions
EP0092943A1 (de) * 1982-04-14 1983-11-02 Magnetic Engineering Pty. Ltd. Scharniere und gelenkig verbundene Waren

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1057549A3 (de) * 1999-06-03 2003-03-12 SALVAGNINI ITALIA S.p.A. Biegemaschine für Blech mit hohen Seiten
FR2852534A1 (fr) * 2003-03-17 2004-09-24 Jouanel Ind Plieuse de tole
CN114700397A (zh) * 2022-04-26 2022-07-05 安徽玖曼智能装备有限公司 一种折弯机用带有挡料机构的递料装置及其实施方法
CN114700397B (zh) * 2022-04-26 2023-09-19 安徽玖曼智能装备有限公司 一种折弯机用带有挡料机构的递料装置及其实施方法
CN115055553A (zh) * 2022-06-29 2022-09-16 中建八局轨道交通建设有限公司 一种弯折装置
CN115055553B (zh) * 2022-06-29 2025-08-19 中建八局轨道交通建设有限公司 一种弯折装置

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Publication number Publication date
FR2638985A1 (fr) 1990-05-18

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