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EP0459971B1 - Method and apparatus for obtaining curved parts in hollow section strips - Google Patents

Method and apparatus for obtaining curved parts in hollow section strips Download PDF

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Publication number
EP0459971B1
EP0459971B1 EP91890106A EP91890106A EP0459971B1 EP 0459971 B1 EP0459971 B1 EP 0459971B1 EP 91890106 A EP91890106 A EP 91890106A EP 91890106 A EP91890106 A EP 91890106A EP 0459971 B1 EP0459971 B1 EP 0459971B1
Authority
EP
European Patent Office
Prior art keywords
hollow
section strip
holding
down clamp
hollow profile
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
Application number
EP91890106A
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German (de)
French (fr)
Other versions
EP0459971A1 (en
EP0459971B2 (en
Inventor
Peter Lisec
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Individual
Original Assignee
Individual
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Publication date
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Priority claimed from AT112690A external-priority patent/AT397054B/en
Priority claimed from AT184090A external-priority patent/AT397775B/en
Priority claimed from AT198790A external-priority patent/AT405912B/en
Application filed by Individual filed Critical Individual
Publication of EP0459971A1 publication Critical patent/EP0459971A1/en
Application granted granted Critical
Publication of EP0459971B1 publication Critical patent/EP0459971B1/en
Publication of EP0459971B2 publication Critical patent/EP0459971B2/en
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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
    • B21D53/00—Making other particular articles
    • B21D53/74—Making other particular articles frames for openings, e.g. for windows, doors, handbags
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/66—Units comprising two or more parallel glass or like panes permanently secured together
    • E06B3/673—Assembling the units
    • E06B3/67304—Preparing rigid spacer members before assembly
    • E06B3/67308—Making spacer frames, e.g. by bending or assembling straight sections
    • E06B3/67313—Making spacer frames, e.g. by bending or assembling straight sections by bending
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/66—Units comprising two or more parallel glass or like panes permanently secured together
    • E06B3/673—Assembling the units
    • E06B2003/67395—Non-planar units or of curvilinear outline, e.g. for vehicles

Definitions

  • the invention relates to a method for producing continuously curved sections in hollow profile strips, in which the hollow profile strip is supported, supported from below, under a hold-down device between guide jaws and is deflected after the hold-down device from the conveying direction of the hollow profile strip by a ramp surface of a bending lever inclined to the conveying direction.
  • One-piece, with more or less sharp-edged corners made of hollow profile strips spacer frames and devices for producing the same are from DE-GM 87 05 796, DE-PS 32 21 881, US-PS 4,836,005, FR-PS 2,444 222 and DE-OS 32 21 986 known.
  • DE-OS 33 12 764 from which it is known to bend hollow profile strips to form spacers for insulating glass panes, a mandrel which can be placed against the hollow profile strip from the inside being provided in the region of the bending point.
  • the bending is carried out by pivoting a jaw, the other end of the profile strip being clamped between a movable clamping jaw and an abutment resting on the inside of the profile strip.
  • a problem with the known bending devices is that the sharp-edged bends required for use with insulating glass panes cannot always be achieved without problems, since there is a risk in part that the walls of the hollow profile strip tear during the bending process and the side surfaces of the hollow profile strips in the corner region, i.e. where they have been bent, do not always run flat, but have corrugations that complicate and hinder the subsequent processing of the spacer frame, in particular the coating of the side surfaces of the spacer frame with sealant or adhesive.
  • the procedure is such that after the spacer is attached to a pane edge, but before it is pivoted, the glass plate is displaced parallel to this pane edge by a distance corresponding to its length, that the pivoting of the glass plate takes place in each case about an identical fixed pivot axis and that the spacer is bent about this pivot axis.
  • the spacer is initially only arranged over part of the length of the first pane edge and the spacer is cut off with a protrusion after it has been attached to the pane-parallel surface of the last pane edge. Only then is the protruding part bent around the pivot axis of the glass pane by 90 ° and attached to the glass pane.
  • hollow profile strips are bent to form spacers for insulating glass panes by pushing them forward during bending and moving a bending lever oscillating towards and away from the abutment, the profile being advanced during the movement of the bending tool and during the next movement of the bending tool towards the abutment is applied to a neighboring point of the profile opposite the previously bent point and bent.
  • different arches and radii of curvature can be generated. However, there are no continuously curved arches, but rather sections of the hollow profile strip which are angled several times.
  • Bending machines for hollow profile bars which are equipped with rollers, are also known.
  • DE-OS 30 34 436 describes a roll bending machine which has three rotationally driven rolls, the hollow profile bar being held in contact with the third roll by two rolls.
  • the radius of the curvature in the hollow profile bar corresponds to the radius of the third roller around which the hollow profile bar was bent.
  • the object of the invention is a method and to provide a device with which continuously curved hollow profile strips can be produced, the radii of curvature and the length of the curved section of the hollow profile strip being largely freely selectable.
  • the method according to the invention has considerable advantages over the operation of previously known bending devices.
  • continuously (continuously) curved sections can be produced.
  • the invention has the advantage that the radius of curvature and / or the length of the curvature can be set very easily.
  • Another advantage is the proposal according to the invention to effect the deflection with the aid of a run-up surface instead of with rollers as is known. This is particularly so in view of the fact that the run-up surface as part of the pivotable bending lever can then be easily adjusted to the desired deflection angle.
  • the hollow profile strip to be curved is advanced by a feed device, which is advantageously designed as a gripper or has a gripper.
  • a feed device which is advantageously designed as a gripper or has a gripper.
  • this saves drives for the rollers, as are necessary for the known devices, and offers the advantage over pulling the hollow profile strip that curved or bent regions (corners) produced therein are not deformed again.
  • a device suitable for carrying out the method according to the invention is based on DE-A-38 07 529, from which the features of the introductory part of claim 6 are known.
  • the device according to the invention differs from this known device by the features mentioned in the characterizing part of claim 6.
  • the hollow profile strip to be bent to the spacer frame is advanced by the feed device (gripper) exactly by the required distance during the bending process, which e.g. corresponds to the respective curved section of the spacer frame. If the length of the curved section is greater than the maximum stroke of the gripper, the profile strip is advanced in two or at most more than two steps.
  • the procedure can be such that the first (or the first) stroke (strokes) correspond to a predetermined length (the maximum stroke) and the last stroke is adapted to the required length of the curved frame section.
  • a hollow profile strip 53 is transported on a conveyor track 54, which is arranged at the lower end of a support wall 60, up to a stop 57 in the region of a bending point 58/59.
  • the stop 57 can also be arranged in front of the bending point so that it can be lowered into the conveyor track.
  • the stop 57 can be equipped with a switch which stops the feed conveyor (not shown) and the detection of the hollow Profile bar 53 triggers by the gripper 51.
  • the hollow profile bar 53 is gripped by the gripper 51 in a precisely defined position.
  • the section 53 'of the hollow profile strip 53 which is transported beyond the bending point 58/59 is bent by the bending lever 59 around an abutment 58 in contact with the supporting wall 60.
  • the bending point preferably has the construction described below with reference to FIGS. 3 to 8.
  • the device can, for example, have the structure known from DE-GM 87 05 796 and have a support finger (indicated in FIG. 9), as is also provided in the known device.
  • the device for bending hollow profile strips 53 shown in FIGS. 3 to 8 consists of a clamp 2 with a stationary clamping jaw 3 and a clamping jaw 4 movable relative to this (the jaw 4 is not shown in FIG. 3).
  • the movable clamping jaw 4 can be displaced in the direction of the double arrow 7 via guide pins 5 and 6, which are each arranged in pairs, so that the mouth width of the clamp 2 can be adapted to the width of the hollow profile strip 53 to be bent.
  • a lever 8 pivotally supported on the fixed jaw 3 is provided, which is coupled via a pull rod 9, which is pivotally supported on the movable jaw 4 via a bearing 10 is.
  • the pivot lever 8 is driven by a linear motor, not shown, e.g. a double-acting pressure cylinder actuated.
  • the bending device also has a hold-down 20, which serves as an abutment during bending.
  • the hold-down device 20 is interchangeably inserted in a carrier 21.
  • a groove 23 is recessed in the carrier 21, in which the hold-down device 20 can be inserted with a sliding fit and is held, for example, by a screw 24.
  • the bracket 21 for the hold-down 20 is mounted on a lever 25 which is about a bearing 26 fixed to the machine frame, i.e. a bearing that is not movable relative to the stationary jaw 3 of the clamp 2, using a linear motor 27, e.g. a double-acting pressure medium cylinder, can be pivoted in the direction of the double arrow 28 from the active position shown in solid lines in FIG. 3 into the standby position shown in broken lines in FIG. 3.
  • a linear motor 27 e.g. a double-acting pressure medium cylinder
  • the carrier 21 for the hold-down device 20, as shown in FIG. 4 can be adjusted perpendicular to the plane of symmetry of the clamp 2, namely in the direction of the double arrow 29 shown in FIG. 4.
  • the carrier 21 is guided displaceably via guides 30 in a holder 31 connected to the lever 25.
  • a linear motor in the exemplary embodiment shown a double-acting pressure medium cylinder 32, is provided, the piston rod 33 of which is coupled to the support 21 via a pull rod 34.
  • the hold-down 20 can not only be pivoted in a plane parallel to the plane of symmetry of the clamp 2 (double arrow 28), but also in a direction perpendicular to the plane of symmetry of the clamp 2 (double arrow 29), so that the hold-down 20 is completely removed can be moved out of the bending area.
  • the hold-down 20 carries at its front end, which is formed by two inclined surfaces 36, which form an acute angle to the longitudinal extension of the hold-down 20, a bead-like extension 35, which like Fig. 6 shows that the upper surface of the hollow profile 53, which is clamped in the clamp 2 between the jaws 3 and 4, bulges slightly before the start of the bending process when the hold-down device 20 is pivoted into its active position.
  • the front end of the holding-down device 20 and the bead-shaped extension 35 adjoining the inclined surfaces 36 thereon are made somewhat narrower than the clear distance between the mutually facing surfaces of the clamping jaws 3 and 4 of the clamp 2.
  • the side walls 40 the hollow profile strip 53 to be bent is also supported from the inside during the bending process, as is indicated in the section of FIG. 7.
  • the hold-down device 20 In order to correctly align the hold-down device 20, in particular its bead-shaped extension 35, with respect to the clamping jaw 2 and thus with respect to the axis 37 (FIG. 5), about which the hollow profile strip 53 is bent, the hold-down device 20 is on one side in the region of its front end an angled stop surface 41 is provided which interacts with a step 42 on the fixed jaw 3. If the stop surface 41 abuts the step 42 of the clamping jaw 3, then the axis 37 of the bead-shaped extension 35 provided at the front end of the hold-down device 20 is correctly aligned.
  • the bending device according to the invention also has a bending lever 59 with a bending attachment 62 which can be pivoted about an axis which coincides with the axis 37 of the bead 35 at the front end of the hold-down device 20 when it is in its active position (the surfaces 41 lie against the Surfaces 42 of the jaw 3).
  • the pivoting range of the bending lever 59 is not limited to the 90 ° shown in Fig. 3, but also goes beyond, so that after swiveling (arrow 28) and lateral displacement (arrow 29) of the hold-down device 20 also acute angles between the two the corner 61 adjacent leg of the hollow profile bar 53 generated in the hollow profile bar 53 can be bent.
  • the clamp 2 When using the device for bending a hollow profile bar 53 to a corner 61, the clamp 2 is opened and the hollow profile bar 53 is placed on the upper guide pins 6 or transported on the conveyor track 54 to the pins 6. After closing the clamp 2, the inner surfaces of the jaws 3 and 4 are then on the side surfaces 40, the hold-down device 20 is moved into its operative position shown in FIGS. 3 and 6 and thereby bulges the upward-facing wall of the hollow profile strip 53 somewhat down one. Then, by pivoting the bending lever 59, the portion 53 'of the hollow profile bar 53 protruding from the clamp 2 is pivoted to form a corner 61. If the angle at the corner 61 is to be more acute, the hold-down device 20 is pivoted back and pulled back laterally, whereupon the bending is continued to the desired angle.
  • the bending lever 59 is pivoted back, the clamp 2 is opened and the hollow profile bar 53 is advanced by the gripper 52 until the location of the hollow profile bar 53 in which the next corner 61 is to be produced is correctly aligned with the bending tool and then, as described above, the next corner 61 is bent. This continues until a spacer frame with the desired number of corners 61 - usually four - is finished.
  • An incremental encoder 56 determines the exact measurement of the distance traveled by the carriage 51, and the movement of the carriage 51 is controlled by the latter.
  • the incremental encoder 56 is mounted on the drive motor 55 or on the movement 54 of the slide 51.
  • the carriage 51 is driven by an endless toothed belt, for example, and is guided on a guide running parallel to the conveyor track 54.
  • the engagement of the toothed belt in the drive gear of the drive motor 55 is exact and free of play, so that an incremental encoder 56 mounted directly on the motor / gear unit can also accurately register the distance traveled by the slide 51.
  • the effective travel distance of the slide 51 corresponds to the profile length which the process computer determines for a bending process.
  • the drive motor 55 does not have to be fixed in place, but can also be arranged on the slide 51.
  • the drive gear of the drive motor 55 then engages in the toothed rack fastened to the guide 54 of the slide 51, it being possible for an incremental encoder 56 to also be mounted on the drive motor 55 or on the slide 51.
  • the gripper 52 mounted on the slide 51 is released.
  • the slide 51 then moves back to the starting position (reference point) at high speed.
  • the gripper 52 detects the hollow profile bar 53 again and the slide 51 moves back exactly after the bending process by the distance specified by the process computer, whereby it advances the hollow profile bar 53 without slippage.
  • the conveyor track 54 can be a simple slideway.
  • a hollow profile bar 53 is so far advanced by a conveying device, which can be, for example, the slide 51 with the gripper 52, for example, starting from the reference position, which is determined by the fitting 57, that the section 53 'projecting over the hold-down device 20 is the hollow Profile bar 53 corresponds to the length of the first leg of the spacer frame to be produced, which length is reduced by a certain distance "x". This position is shown in Fig. 9b. Now the jaws 3 and 4 lie against the hollow profile bar 53 and the slide 51 returns to its starting position, which is shown in FIG. 9a.
  • the section 53 ′ around the hold-down device 20 is bent upwards by the bending lever 59 in the direction of the arrow in FIG. 9b.
  • the hollow profile bar 53 is released from the jaws 3 and 4 and the slide 51 moves forward with the gripper 52 placed on the hollow profile bar 53 from both sides or from above and below into the position shown in FIG. 9c , whereby it advances the hollow profile bar 53 so far that the next (second) location in which a corner 61 is to be created in the hollow profile bar 53 is aligned with the hold-down device 20.
  • the jaws 3 and 4 close again and hold the hollow profile bar 53 immovably and the next (second) bending process is carried out with the aid of the bending lever 59, while the slide 51 returns to its starting position.
  • the slide 51 moves forward with the grippers 52 applied to the hollow profile bar 53 by a distance which corresponds to the length of the next leg of the spacer frame to be produced, so that the next (third) bending point is aligned with the hold-down device 20 .
  • the clamping jaws 3, 4 close again and hold the hollow profile strip 53 firmly, whereupon the third bending process is carried out.
  • the jaws 3 and 4 are released again from the hollow profile bar 53 and the slide 51 moves again with the gripper 52 applied to the hollow profile bar 53 so far that the next (fourth) bending point relative to the hold-down device 20 is accurate is aligned.
  • this stroke corresponds exactly to the stroke before the execution of the second bending process.
  • the jaws 3 and 4 close again and hold the hollow profile bar 53 in place.
  • the hollow profile strip 53 is cut off at the point indicated by the arrow 170 (FIG. 9e).
  • the length of the piece of hollow profile bar 53 thus obtained in FIG. 9e to the left of the hold-down device 20 corresponds exactly to the predetermined distance "x" by which the hollow profile bar 53 was advanced less than the length of the first before the first bending process (FIG. 9b) Leg (Fig. 9b) corresponds.
  • the fourth bending process is carried out, the front end 172 of the supplied hollow profile bar 53 and / or the section 173 of the partially finished spacer frame being deflected out of the bending plane or the front end 172 simply being moved down so that the fourth bending process is not hindered.
  • the spacer frame apart from the connection of the two ends of the hollow profiled strip 53 adjoining each other at the joint 171 (FIG. 9f), is removed from the device after the jaws 3 and 4 are released again and the hold-down device 20 is removed the bending plane have been removed.
  • the adjoining ends of the hollow profile strip 53 bent to form the spacer frame at the joint 171 are connected to one another by inserting a connector or by butt welding.
  • a welding device suitable for this purpose is known for example from EP-A-0 192 921.
  • a hold-down device 80 is inserted into the carrier 21 of the tool and has a freely rotatable roller 70 at its free end facing the hollow profile strip 53 (Fig. 10 to 17). Through this roller 70, the hollow profile bar 53, which is guided between the jaws 3 and 4 - i.e. the jaws 3 and 4 no longer clamp the hollow profile strip 53 - held against the guide rods 6 serving as support from below.
  • spacer frames with at least one corner 61 and with at least one curved section 71 are to be produced (see FIG. 22), it is also possible to use a hold-down device without a freely rotatable roller 70, i.e. with a hold-down device 20, as shown in FIGS. 3 to 8, which has a lug at its front end similar or identical to the lug 35, or as described further below with reference to FIGS. 19 to 21, is trained.
  • the bending lever 59 is so inclined when generating curved sections 71 in hollow profile strips 53 with respect to the conveying direction of the hollow profile strip 53 according to the desired radius of curvature, so that the hollow profile strip 53 emerging between the jaws 3 and 4 is deflected upwards by the bending attachment 62 on the bending lever 59 and thereby is continuously curved.
  • the width of the roller 70 is somewhat narrower than the width of the hollow profile strip 53 to be curved, so that the inner wall the hollow profile bar 53, as can also be seen from FIG. 16, is deformed inward during the curving process. This reduces the compression of the inner wall of the hollow profile bar 53, so that there is a largely smooth inner wall in the curved section 71 of the hollow profile bar 53.
  • FIG. 18 A particularly favorable embodiment of a gripper 51, which ensures the necessary frictional engagement for the precise advancement of the hollow profile strip 53 to be curved, is shown in FIG. 18. It can be seen that the lower jaw 75 is rigidly connected to a carriage 76 guided in the conveying direction on at least one guide rail, whereas the upper jaw 77 can be pivoted away from the jaw 75 via parallelogram link 78 by a pressure medium motor 79. The movable jaw 77 can therefore be pivoted behind the support wall 60 of the device so that it does not hinder the removal of a finished bent spacer frame.
  • the stop 57 based on the conveying direction of the hollow profile bar 53, can be arranged in front of the tool with the hold-down device 20 or 80 and the bending lever 59.
  • the stop 57 is preferably equipped with a limit switch and is located in relation to the conveying direction of the hollow profile bar 53 after the end of the stroke of the gripper 51 that is remote from the tool. In this way, a hollow profile bar 53 can be conveyed into the device up to the fitting 57 are, whereupon the switch is actuated and controlled by a sequential circuit, the gripper 51 takes over the hollow profile bar 53 in a precisely defined position.
  • spacer frames with at least one sharply bent corner with any angle between the legs of the spacer frame adjacent to the corner 61 and with at least one curved section 71 can be produced from one and the same hollow profile strip 53.
  • both a hold-down 80 and a hold-down 20 can be mounted on the carrier 21. These tools are then occasionally moved into the active position, which is symmetrical to the jaws 3 and 4. This is not a problem, since the carrier 21, as described above with reference to FIGS. 1 to 8, can be raised and adjusted transversely to the bending plane.
  • FIGS. 19 to 21 corresponds essentially to the device described with reference to FIGS. 10 to 17, but instead of the freely rotatable roller 70, a slide 81 is inserted in the hold-down device 80, through which the inner wall of the hollow profile strip 53, such as can be seen from Fig. 21, is deformed inward during the bending.
  • the devices described with reference to FIGS. 10 to 21 can be designed like the device described with reference to FIGS. 1 to 8 and also as shown in FIG. 9.
  • Both the hold-down device 80 with the roller 70 and the hold-down device 20 with its extension 35 are in the conveying direction, i.e. adjustable parallel to a plane connecting the guide pins 6.
  • the position of the hold-down devices can thus be adapted to the geometric conditions which result after changing the angular position of the lever 50 with the run-up surface 62.
  • hollow profile strips 53 can also be bent to form spacer frames for insulating glass panes which have at least one sharp-angled corner 61 and at least one section 71, for example curved according to a partial arc.
  • An example of such a frame is shown in FIG. 22.
  • the hold-down device 20 with the attachment 35 or the hold-down device 80 with the attachment 81 is used, even without a tool change, sharp-edged corners when generating these corners is the feed for the hollow profile bar 53 when the bending lever 59 is moved up stopped - as well as (arc-shaped) curved sections - the feed for the hollow profile bar 53 is actuated with the bending lever 59 actuated more or less strongly with the run-up surface 62 - can be produced.

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Container Filling Or Packaging Operations (AREA)
  • Food-Manufacturing Devices (AREA)
  • Laminated Bodies (AREA)

Abstract

In order to bend a hollow profile strip (53), in particular a hollow profile strip (53) from which a spacer frame for a pane of insulating glass is to be manufactured, the hollow profile strip (53) is held continuously a precisely defined distance to the side and from below, passed under a roller (70) and, after the roller (70) is deflected out of the delivery direction. An apparatus suitable for this purpose has a gripper (52) for the defined advance of the hollow profile strip (53), a roller (70), which rests against the wall of the hollow profile strip (53), the said wall then being situated on the inside of the bend, and holds down the hollow profile strip (53), and a lever (59) with an impact surface (62) for the hollow profile strip (53) after the roller (70). The length and/or the radius of curvature of the bent section (71) of the hollow profile strip (53) can be determined by selection of the extent of the advance of the hollow profile strip (53) and the extent of the deflection of the same. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zum Erzeugen kontinuierlich gekrümmter Abschnitte in Hohlprofilleisten, bei dem die Hohlprofilleiste unter einem Niederhalter zwischen Führungsbacken, von unten abgestützt, vorgeschoben und nach dem Niederhalter aus der Förderrichtung der Hohlprofilleiste durch eine zur Förderrichtung schräggestellte Auflauffläche eines Biegehebels abgelenkt wird.The invention relates to a method for producing continuously curved sections in hollow profile strips, in which the hollow profile strip is supported, supported from below, under a hold-down device between guide jaws and is deflected after the hold-down device from the conveying direction of the hollow profile strip by a ramp surface of a bending lever inclined to the conveying direction.

EinstĂĽckig, mit mehr oder weniger scharfkantig abgebogenen Ecken aus Hohlprofilleisten bestehende Abstandhalterrahmen sowie Vorrichtungen zum Herstellen derselben sind aus dem DE-GM 87 05 796, der DE-PS 32 21 881, der US-PS 4 836 005, der FR-PS 2 449 222 und der DE-OS 32 21 986 bekannt.One-piece, with more or less sharp-edged corners made of hollow profile strips spacer frames and devices for producing the same are from DE-GM 87 05 796, DE-PS 32 21 881, US-PS 4,836,005, FR-PS 2,444 222 and DE-OS 32 21 986 known.

Es ist noch auf die DE-OS 33 12 764 zu verweisen, aus der es bekannt ist, Hohlprofilleisten zu Abstandhaltern fĂĽr Isolierglasscheiben zu biegen, wobei im Bereich der Biegestelle ein von innen gegen die Hohlprofilleiste anlegbarer Dorn vorgesehen ist. Das Biegen erfolgt durch Verschwenken einer Backe, wobei das andere Ende der Profilleiste zwischen einer beweglichen Spannbacke und einem an der Innenseite der Profilleiste anliegenden Widerlager geklemmt wird.Reference is also made to DE-OS 33 12 764, from which it is known to bend hollow profile strips to form spacers for insulating glass panes, a mandrel which can be placed against the hollow profile strip from the inside being provided in the region of the bending point. The bending is carried out by pivoting a jaw, the other end of the profile strip being clamped between a movable clamping jaw and an abutment resting on the inside of the profile strip.

Ein Problem bei den bekannten Biegevorrichtungen ist es, daß die für die Verwendung bei Isolierglasscheiben geforderten scharfkantigen Abbiegungen nicht immer problemlos erreicht werden können, da zum Teil die Gefahr besteht, daß die Wände der Hohlprofilleiste beim Biegevorgang einreißen und die Seitenflächen der Hohlprofilleisten im Eckbereich, d.h. dort, wo sie gebogen worden sind, nicht immer plan verlaufen, sondern Wellungen aufweisen, welche die nachträgliche Verarbeitung des Abstandhalterrahmens, insbesondere die Beschichtung der Seitenflächen der Abstandhalterrahmen mit Dicht- bzw. Klebemasse erschweren und behindern.A problem with the known bending devices is that the sharp-edged bends required for use with insulating glass panes cannot always be achieved without problems, since there is a risk in part that the walls of the hollow profile strip tear during the bending process and the side surfaces of the hollow profile strips in the corner region, i.e. where they have been bent, do not always run flat, but have corrugations that complicate and hinder the subsequent processing of the spacer frame, in particular the coating of the side surfaces of the spacer frame with sealant or adhesive.

Aus der DE-AS 21 28 717 ist ein Verfahren zum Aufbringen eines metallischen Abstand halters auf die Scheibenränder einer der rechteckigen Glasplatten einer Isolierverglasung bekannt. Bei diesem Verfahren wird der Abstand halter fortlaufend mit einer scheibenparallelen Fläche an einem ersten Scheibenrand der horizontal liegenden Glasplatte in Berührung gebracht und anschließend befestigt. Dann wird derAbstandhalter mit einer scheibenparallelen Fläche am nächsten Scheibenrand angelegt und befestigt. Diese Arbeitsschritte werden wiederholt, bis der Abstandhalterrahmen an allen Scheibenrändern befestigt ist. Hierauf wird derAbstandhalter abgeschnitten und seine Enden aneinandergefügt. Bei diesem Verfahren wird so vorgegangen, daß die Glasplatte nach dem Befestigen des Abstandhalters an einem Scheibenrand, jedoch vor ihrer Verschwenkung parallel zu diesem Scheibenrand um eine dessen Länge entsprechenden Strecke verschoben wird, daß die Verschwenkung der Glasplatte jeweils um eine gleiche festgelegte Schwenkachse erfolgt und daß der Abstandhalter um diese Schwenkachse gebogen wird. Dabei wird der Abstandhalter anfangs nur auf einem Teil der Länge des ersten Scheibenrandes angeordnet und derAbstandhalter nach seiner Befestigung an der scheibenparallelen Fläche des letzten Scheibenrandes mit einem Überstand abgeschnitten. Erst dann wird der überstehende Teil um die Schwenkachse der Glasscheibe um 90° gebogen und an der Glasscheibe befestigt.From DE-AS 21 28 717 a method for applying a metallic spacer to the pane edges of one of the rectangular glass plates of an insulating glazing is known. In this method, the spacer is continuously brought into contact with a pane-parallel surface on a first pane edge of the horizontally lying glass plate and then fastened. Then the spacer with a disk-parallel surface is placed on the next disk edge and fastened. These steps are repeated until the spacer frame is attached to all pane edges. The spacer is then cut off and its ends joined together. In this method, the procedure is such that after the spacer is attached to a pane edge, but before it is pivoted, the glass plate is displaced parallel to this pane edge by a distance corresponding to its length, that the pivoting of the glass plate takes place in each case about an identical fixed pivot axis and that the spacer is bent about this pivot axis. The spacer is initially only arranged over part of the length of the first pane edge and the spacer is cut off with a protrusion after it has been attached to the pane-parallel surface of the last pane edge. Only then is the protruding part bent around the pivot axis of the glass pane by 90 ° and attached to the glass pane.

Aus der EP-A-332 049 (= DE-A-38 07 529) ist ein Verfahren mit den Merkmalen des einleitenden Teils des unabhängigen Anspruches 1 bekannt. Bei der EP-A-332 049 werden Hohlprofilleisten zu Abstandhaltern für Isolierglasscheiben gebogen, indem diese während des Biegens vorgeschoben und ein Biegehebel oszillierend zum Widerlager hin- und von ihm wegbewegt wird, wobei während der Wegbewegung des Biegewerkzeuges das Profil vorgeschoben und bei der nächsten Bewegung des Biegewerkzeuges zum Widerlager hin eine Nachbarstelle des Profiles gegenüber der vorher gebogenen Stelle beaufschlagt und gebogen wird. Dadurch können je nach Vorschubgeschwindigkeit des Profiles und der Biegefrequenz bzw. dem Biegehub des Biegewerkzeuges unterschiedliche Bögen und Krümmungsradien erzeugt werden. Es werden aber keine stetig gekrümmten Bögen, sondern Abschnitte der Hohlprofilleiste erhalten, die mehrfach abgewinkelt sind.EP-A-332 049 (= DE-A-38 07 529) discloses a method with the features of the introductory part of independent claim 1. In EP-A-332 049, hollow profile strips are bent to form spacers for insulating glass panes by pushing them forward during bending and moving a bending lever oscillating towards and away from the abutment, the profile being advanced during the movement of the bending tool and during the next movement of the bending tool towards the abutment is applied to a neighboring point of the profile opposite the previously bent point and bent. Depending on the feed speed of the profile and the bending frequency or the bending stroke of the bending tool, different arches and radii of curvature can be generated. However, there are no continuously curved arches, but rather sections of the hollow profile strip which are angled several times.

Bekannt sind auch Biegemaschinen für Hohlprofilstäbe, die mit Walzen ausgerüstet sind. So beschreibt die DE-OS 30 34 436 eine Walzenbiegemaschine, die drei drehangetriebene Walzen aufweist, wobei der Hohlprofilstab von zwei Walzen in Anlage an die dritte Walze gehalten wird. Der Radius der Krümmung im Hohlprofilstab entspricht dem Radius der dritten Walze, um die herum der Hohlprofilstab gebogen wurde.Bending machines for hollow profile bars, which are equipped with rollers, are also known. For example, DE-OS 30 34 436 describes a roll bending machine which has three rotationally driven rolls, the hollow profile bar being held in contact with the third roll by two rolls. The radius of the curvature in the hollow profile bar corresponds to the radius of the third roller around which the hollow profile bar was bent.

Aus der US-PS 3 885 412 ist es ebenfalls bekannt, einen Hohlprofilstab kontinuierlich zu krümmen, indem er durch eine Anordnung aus drei Walzen bewegt wird. Der Hohlprofilstab wird bei der US-PS 3 885 412 zwischen zwei Walzen durchbewegt, wobei er von der bezogen auf seine Bewegungsrichtung vor dem Walzenpaar angeordneten dritten Walze so belastet wird, daß er beim Durchtritt zwischen den Walzen des Walzenpaares gekrümmtwird. Die einlaufseitige Walze kann verstelltwerden, so daß unterschiedliche Krümmungen hergestellt werden können.From US Pat. No. 3,885,412 it is also known to continuously bend a hollow profile rod by moving it through an arrangement of three rollers. In US Pat. No. 3,885,412, the hollow section rod is moved between two rollers, being loaded by the third roller arranged in front of the pair of rollers with respect to its direction of movement, so that it is curved as it passes between the rollers of the pair of rollers. The roller on the inlet side can be adjusted so that different curvatures can be produced.

Beide bekannten Vorrichtungen arbeiten ausschließlich mit Rollen, wobei auch die Auslenkung durch eine Rolle bewirkt wird. Mit den bekannten Vorrichtungen ist es nicht möglich, Abstandhalterrahmen herzustellen, die gebogene und gerade Abschnitte sowie gegebenenfalls wenigstens eine Ecke besitzen.Both known devices work exclusively with rollers, the deflection also being effected by a roller. With the known devices, it is not possible to produce spacer frames which have curved and straight sections and, if appropriate, at least one corner.

Aufgabe der Erfindung ist es, ein Verfahren und eine Vorrichtung zur Verfügung zu stellen, mit welchem kontinuierlich gekrümmte Hohlprofilleisten hergestellt werden können, wobei die Krümmungsradien und die Länge des gekrümmten Abschnittes der Hohlprofilleiste weitgehend frei wählbar sind.The object of the invention is a method and to provide a device with which continuously curved hollow profile strips can be produced, the radii of curvature and the length of the curved section of the hollow profile strip being largely freely selectable.

Gelöst wird diese Aufgabe bei einem Verfahren der eingangs genannten Gattung dadurch, daß die Auflauffläche während des Krümmungsvorganges in ihrer Wirkstellung stillsteht, und daß die krümmungsaußenseitige Wand der Hohlprofilleiste während des ganzen Krümmungsvorganges an der schräggestellten Auflauffläche entlanggleitet.This object is achieved in a method of the type mentioned in that the run-up surface stands still in its operative position during the curving process and that the wall of the hollow profile strip on the outside of the curvature slides along the inclined run-up surface during the entire curving process.

Gegenüber der Arbeitsweise vorbekannter Biegevorrichtungen besitzt das erfindungsgemäße Verfahren erhebliche Vorteile. So können anders als bei der EP-A-33 20 49 kontinuierlich (stetig) gekrümmte Abschnitte erzeugt werden.The method according to the invention has considerable advantages over the operation of previously known bending devices. In contrast to EP-A-33 20 49, continuously (continuously) curved sections can be produced.

Im Vergleich zu den aus der DE-OS 30 34 436 und der US-PS 3 885 412 bekannten Arbeitsweise ist bei der Erfindung von Vorteil, daß der Krümmungsradius und/oder die Länge der Krümmung sehr einfach eingestellt werden können. Ein weiterer Vorteil besteht in dem erfindungsgemäßen Vorschlag, das Auslenken mit Hilfe einer Auflauffläche statt wie bekannt mit Rollen zu bewirken. Dies insbesondere im Hinblick darauf, daß die Auflauffläche als Teil des verschwenkbaren Biegehebels dann ohne weiteres auf den gewünschten Auslenkwinkel eingestellt werden kann.Compared to the method known from DE-OS 30 34 436 and US Pat. No. 3,885,412, the invention has the advantage that the radius of curvature and / or the length of the curvature can be set very easily. Another advantage is the proposal according to the invention to effect the deflection with the aid of a run-up surface instead of with rollers as is known. This is particularly so in view of the fact that the run-up surface as part of the pivotable bending lever can then be easily adjusted to the desired deflection angle.

Für den Erfolg des erfindungsgemäßen Verfahrens ist es förderlich, wenn die zu krümmende Hohlprofilleiste von einer Vorschubvorrichtung, die vorteilhaft als Greifer ausgebildet ist oder einen Greifer aufweist, vorgeschoben wird. Dies erspart einerseits Antriebe für die Rollen, wie diese für die bekannten Vorrichtungen nötig sind und bietet gegenüber einem Ziehen der Hohlprofilleiste den Vorteil, daß in dieser hergestellte gekrümmte bzw. abgebogene Bereiche (Ecken) nicht wieder verformt werden.For the success of the method according to the invention, it is beneficial if the hollow profile strip to be curved is advanced by a feed device, which is advantageously designed as a gripper or has a gripper. On the one hand, this saves drives for the rollers, as are necessary for the known devices, and offers the advantage over pulling the hollow profile strip that curved or bent regions (corners) produced therein are not deformed again.

Eine zum Durchführen des erfindungsgemäßen Verfahrens geeignete Vorrichtung geht aus von der DE-A-38 07 529, aus der die Merkmale des einleitenden Teils von Anspruch 6 bekannt sind. Von dieser bekannten Vorrichtung unterscheidet sich die erfindungsgemäße Vorrichtung durch die im kennzeichnenden Teil des Anspruches 6 genannten Merkmale.A device suitable for carrying out the method according to the invention is based on DE-A-38 07 529, from which the features of the introductory part of claim 6 are known. The device according to the invention differs from this known device by the features mentioned in the characterizing part of claim 6.

Vorteilhafte Ausgestaltungen des Verfahrens der Erfindung und zur DurchfĂĽhrung des Verfahrens geeignete Vorrichtungen sind Gegenstand der UnteransprĂĽche.Advantageous embodiments of the method of the invention and devices suitable for carrying out the method are the subject of the dependent claims.

Beim erfindungsgemäßen Verfahren wird die zum Abstandhalterrahmen zu biegende Hohlprofilleiste beim Biegevorgang von der Vorschubvorrichtung (Greifer) genau um die erforderliche Strecke vorgeschoben, die z.B. dem jeweiligen gekrümmten Abschnitt des Abstandhalterrahmens entspricht. Falls die Länge des gekrümmten Abschnittes größer ist als der maximale Hub des Greifers, wird die Profilleiste in zwei oder allenfalls mehr als zwei Schritten vorgeschoben. Dabei kann so vorgegangen werden, daß der erste (oder die ersten) Hub (Hübe) einer vorgegebenen Länge (dem maximalen Hub) entsprechen und der letzte Hub an die benötigte Länge des gekrümmten Rahmenabschnittes angepaßt wird.In the method according to the invention, the hollow profile strip to be bent to the spacer frame is advanced by the feed device (gripper) exactly by the required distance during the bending process, which e.g. corresponds to the respective curved section of the spacer frame. If the length of the curved section is greater than the maximum stroke of the gripper, the profile strip is advanced in two or at most more than two steps. The procedure can be such that the first (or the first) stroke (strokes) correspond to a predetermined length (the maximum stroke) and the last stroke is adapted to the required length of the curved frame section.

Weitere Einzelheiten und Merkmale von AusfĂĽhrungs beispielen der Vorrichtung und des Verfahrens der Erfindung und weitere damit erzielte Vorteile ergeben sich aus der nachstehenden Beschreibung von in den Zeichnungen gezeigten AusfĂĽhrungsformen: Es zeigt:

  • Fig. 1 eine Vorrichtung zum Biegen von Hohlprofilleisten zu Abstandhalterrahmen,
  • Fig. 2 die Vorrichtung aus Fig. 1 in vergrößertem MaĂźstab,
  • Fig. 3 einen Biegekopf in Seitenansicht,
  • Fig. 4 einen Biegekopf von links der Fig. 3 aus gesehen,
  • Fig. 5 eine Draufsicht auf den Biegekopf,
  • Fig. 6 eine Einzelheit des Biegekopfes im Bereich des Biegewiderlagers,
  • Fig. 7 im Schnitt den Biegekopf,
  • Fig. 8 eine vergrößerte Einzelheit im Bereich des Widerlagers,
  • Fig. 9 schematisch einzelne Stufen der Arbeitsweise der Vorrichtung gemäß den Fig. 1 bis 8,
  • Fig. 10 eine Vorrichtung zum KrĂĽmmen von Hohlprofilleisten,
  • Fig. 11 die Vorrichtung aus Fig. 10 in vergrößertem MaĂźstab,
  • Fig. 12 das Werkzeug, mit dem die Hohlprofilleiste gekrĂĽmmt wird, in Seitenansicht,
  • Fig. 13 das Werkzeug von links der Fig. 12 aus gesehen,
  • Fig. 14 eine Einzelheit des Werkzeuges,
  • Fig. 15 einen Schnitt durch das Werkzeug,
  • Fig. 16 und 17 weitere Einzelheiten des Werkzeuges,
  • Fig. 18 eine AusfĂĽhrungsform des Greifers fĂĽr den Vorschub der Hohlprofilleiste,
  • Fig. 19 eine weitere AusfĂĽhrungsform des Werkzeuges von Fig. 12,
  • Fig. 20 eine vergrößerte Ansicht des Werkzeuges von Fig. 19,
  • Fig. 21 eine vergrößerte Ansicht des Werkzeuges von Fig. 20 von rechts gesehen und
  • Fig. 22 einen Abstandhalterrahmen mit zwei Ecken und einem gekrĂĽmmten Abschnitt.
Further details and features of exemplary embodiments of the device and the method of the invention and further advantages achieved therewith result from the following description of embodiments shown in the drawings: It shows:
  • 1 shows a device for bending hollow profile strips into spacer frames,
  • 2 shows the device from FIG. 1 on an enlarged scale,
  • 3 a bending head in side view,
  • 4 seen a bending head from the left of FIG. 3,
  • 5 is a plan view of the bending head,
  • 6 shows a detail of the bending head in the area of the bending abutment,
  • 7 in section the bending head,
  • 8 is an enlarged detail in the area of the abutment,
  • 9 schematically shows individual stages of the operation of the device according to FIGS. 1 to 8,
  • 10 shows a device for bending hollow profile strips,
  • 11 shows the device from FIG. 10 on an enlarged scale,
  • 12 the tool with which the hollow profile strip is curved, in side view,
  • 13 the tool seen from the left of FIG. 12,
  • 14 shows a detail of the tool,
  • 15 shows a section through the tool,
  • 16 and 17 further details of the tool,
  • 18 shows an embodiment of the gripper for advancing the hollow profile strip,
  • 19 shows a further embodiment of the tool from FIG. 12,
  • 20 is an enlarged view of the tool of FIG. 19,
  • Fig. 21 is an enlarged view of the tool of Fig. 20 seen from the right and
  • 22 shows a spacer frame with two corners and a curved section.

In einer in den Fig. 1 und 2 gezeigten Vorrichtung wird eine Hohlprofilleiste 53 auf einer Förderbahn 54, die am unteren Ende einer Stützwand 60 angeordnet ist, bis zu einem Anschlag 57 im Bereich einer Biegestelle 58/59 transportiert. Der Anschlag 57 kann auch vor der Biegestelle in die Förderbahn versenkbar angeordnet sein. Der Anschlag 57 kann mit einem Schalter ausgestattet sein, der den Zufuhrförderer (nicht gezeigt) stillsetzt und das Erfassen der Hohlprofilleiste 53 durch den Greifer 51 auslöst. So wird die Hohlprofilleiste 53 vom Greifer 51 in genau definierter Lage erfaßt.In a device shown in FIGS. 1 and 2, a hollow profile strip 53 is transported on a conveyor track 54, which is arranged at the lower end of a support wall 60, up to a stop 57 in the region of a bending point 58/59. The stop 57 can also be arranged in front of the bending point so that it can be lowered into the conveyor track. The stop 57 can be equipped with a switch which stops the feed conveyor (not shown) and the detection of the hollow Profile bar 53 triggers by the gripper 51. Thus, the hollow profile bar 53 is gripped by the gripper 51 in a precisely defined position.

Der ĂĽber die Biegestelle 58/59 hinaus transportierte Abschnitt 53' der Hohlprofilleiste 53 wird an der StĂĽtzwand 60 anliegend vom Biegehebel 59 um ein Widerlager 58 herum gebogen. Die Biegestelle besitzt bevorzugt die unten an Hand der Fig. 3 bis 8 beschriebene Konstruktion.The section 53 'of the hollow profile strip 53 which is transported beyond the bending point 58/59 is bent by the bending lever 59 around an abutment 58 in contact with the supporting wall 60. The bending point preferably has the construction described below with reference to FIGS. 3 to 8.

Die Vorrichtung kann im ĂĽbrigen beispielsweise den aus der DE-GM 87 05 796 bekannten Aufbau besitzen und einen StĂĽtzfinger (in Fig. 9 angedeutet) aufweisen, wie er auch in der bekannten Vorrichtung vorgesehen ist.The device can, for example, have the structure known from DE-GM 87 05 796 and have a support finger (indicated in FIG. 9), as is also provided in the known device.

Die in den Fig. 3 bis 8 gezeigte Vorrichtung zum Biegen von Hohlprofilleisten 53 besteht aus einer Klemme 2 mit einer ortsfesten Klemmbacke 3 und einer gegenĂĽber dieser beweglichen Klemmbacke 4 (in Fig. 3 istdie Kiemmbacke4 nicht gezeigt). Die bewegliche Klemmbacke 4 ist ĂĽber FĂĽhrungsstifte 5 und 6, die jeweils paarweise angeordnet sind, in Richtung des Doppelpfeils 7 verschiebbar, so daĂź die Maulweite der Klemme 2 an die Breite der zu biegenden Hohlprofilleiste 53 angepaĂźt werden kann.The device for bending hollow profile strips 53 shown in FIGS. 3 to 8 consists of a clamp 2 with a stationary clamping jaw 3 and a clamping jaw 4 movable relative to this (the jaw 4 is not shown in FIG. 3). The movable clamping jaw 4 can be displaced in the direction of the double arrow 7 via guide pins 5 and 6, which are each arranged in pairs, so that the mouth width of the clamp 2 can be adapted to the width of the hollow profile strip 53 to be bent.

Zur Betätigung der beweglichen Klemmbacke 4 in Richtung des Pfeiles 7 (Fig. 4) ist ein an der feststehenden Klemmbacke 3 verschwenkbar abgestützter Hebel 8 vorgesehen, der über eine Zugstange 9, die über ein Lager 10 schwenkbeweglich an der beweglichen Klemmbacke 4 abgestützt ist, gekuppelt ist. Der Schwenkhebel 8 wird durch einen nicht gezeigten Linearmotor, z.B. einen doppelt wirkenden Druckmittelzylinder, betätigt.To actuate the movable jaw 4 in the direction of arrow 7 (FIG. 4), a lever 8 pivotally supported on the fixed jaw 3 is provided, which is coupled via a pull rod 9, which is pivotally supported on the movable jaw 4 via a bearing 10 is. The pivot lever 8 is driven by a linear motor, not shown, e.g. a double-acting pressure cylinder actuated.

Die Biegevorrichtung besitzt weiters einen Niederhalter 20, der beim Biegen als Widerlager dient. Der Niederhalter 20 ist auswechselbar in einem Träger 21 eingesetzt. Hiezu ist im Träger 21 eine Nut 23 ausgespart, in die der Niederhalter 20 mit Gleitsitz einsetzbar ist und beispielsweise durch eine Schraube 24 gehalten wird.The bending device also has a hold-down 20, which serves as an abutment during bending. The hold-down device 20 is interchangeably inserted in a carrier 21. For this purpose, a groove 23 is recessed in the carrier 21, in which the hold-down device 20 can be inserted with a sliding fit and is held, for example, by a screw 24.

Der Träger 21 für den Niederhalter 20 ist an einem Hebel 25 montiert, der um ein maschinengestellfestes Lager 26, d.h. ein Lager, das gegenüber der ortsfesten Klemmbacke 3 der Klemme 2 nicht beweglich ist, mit Hilfe eines Linearmotors 27, z.B. einem doppelt wirkenden Druckmittelzylinder, in Richtung des Doppelpfeiles 28 aus der in Fig. 3 in durchgehenden Linien dargestellten Wirkstellung in die in Fig. 3 strichpunktiert eingezeichnete Bereitschaftsstellung verschwenkbar ist.The bracket 21 for the hold-down 20 is mounted on a lever 25 which is about a bearing 26 fixed to the machine frame, i.e. a bearing that is not movable relative to the stationary jaw 3 of the clamp 2, using a linear motor 27, e.g. a double-acting pressure medium cylinder, can be pivoted in the direction of the double arrow 28 from the active position shown in solid lines in FIG. 3 into the standby position shown in broken lines in FIG. 3.

Zusätzlich ist der Träger 21 für den Niederhalter 20, wie dies Fig. 4 zeigt, senkrecht zur Symmetrieebene der Klemme 2, nämlich in Richtung des in Fig. 4 eingezeichneten Doppelpfeiles 29 verstellbar. Hiezu ist der Träger 21 über Führungen 30 in einer mit dem Hebel 25 verbundenen Halterung 31 verschiebbar geführt. Zur Verstellung des Trägers 21 und damit des Niederhalters 20 in Richtung des Doppelpfeiles 29 ist ein Linearmotor, im gezeigten Ausführungsbeispiel ein doppelt wirkender Druckmittelzylinder 32, vorgesehen, dessen Kolbenstange 33 über eine Zugstange 34 mit dem Träger 21 gekuppelt ist.In addition, the carrier 21 for the hold-down device 20, as shown in FIG. 4, can be adjusted perpendicular to the plane of symmetry of the clamp 2, namely in the direction of the double arrow 29 shown in FIG. 4. For this purpose, the carrier 21 is guided displaceably via guides 30 in a holder 31 connected to the lever 25. To adjust the support 21 and thus the hold-down device 20 in the direction of the double arrow 29, a linear motor, in the exemplary embodiment shown a double-acting pressure medium cylinder 32, is provided, the piston rod 33 of which is coupled to the support 21 via a pull rod 34.

Auf diese Weise kann der Niederhalter 20 nicht nur in einer zur Symmetrieebene der Klemme 2 parallelen Ebene verschwenkt (Doppelpfeil 28), sondern auch in einer zur Symmetrieebene der Klemme 2 senkrechten Richtung (Doppelpfeil 29) verstellt werden, so daß der Niederhalter 20 zur Gänze aus dem Biegebereich herausbewegt werden kann.In this way, the hold-down 20 can not only be pivoted in a plane parallel to the plane of symmetry of the clamp 2 (double arrow 28), but also in a direction perpendicular to the plane of symmetry of the clamp 2 (double arrow 29), so that the hold-down 20 is completely removed can be moved out of the bending area.

Wie die Fig. 3 und 4 und insbesondere Fig. 6 zeigt, trägt der Niederhalter 20 an seinem vorderen Ende, das von zwei Schrägflächen 36, die zur Längserstreckung des Niederhalters 20 einen spitzen Winkel einschließen, gebildet wird, einen wulstartigen Ansatz 35, der wie Fig. 6 zeigt, die obere Fläche des Hohlprofils 53, das in der Klemme 2 zwischen den Klemmbacken 3 und 4 geklemmt ist, noch vor dem Beginn des Biegevorganges beim Einschwenken des Niederhalters 20 in seine Wirkstellung etwas einwöl bt.3 and 4 and in particular Fig. 6 shows, the hold-down 20 carries at its front end, which is formed by two inclined surfaces 36, which form an acute angle to the longitudinal extension of the hold-down 20, a bead-like extension 35, which like Fig. 6 shows that the upper surface of the hollow profile 53, which is clamped in the clamp 2 between the jaws 3 and 4, bulges slightly before the start of the bending process when the hold-down device 20 is pivoted into its active position.

Zusätzlich ist bei dererfindungsgemäßen Biegevorrichtung vorgesehen, daß das vordere Ende des Niederhalters 20 und derdortan die Schrägfächen 36 anschließende, wulstförmige Ansatz 35 etwas schmäler ausgebildet als der lichte Abstand zwischen den einander zugekehrten Flächen der Klemmbacken 3 und 4 der Klemme 2. So werden die Seitenwände 40 der zu biegenden Hohlprofilleiste 53 während des Biegevorganges auch von innen her abgestützt, wie dies im Schnitt von Fig. 7 angedeutet ist. Dies ist insbesondere beim Biegen von Hohlprofilleisten 53 zu Abstandhalterrahmen für Isolierglasscheiben von Bedeutung, da die Breite der Seitenflächen 40 der Hohlprofilleiste 53 auch im Eckbereich möglichst nicht verkleinert werden soll und diese Seitenflächen 40 im Eckbereich nicht aus der von den Seitenflächen 40 im Bereich der Ecke definierten Ebenen nach innen abweichen sollen, damit das vor dem Zusammenbau der Isolierglasscheiben auf die Seitenflächen 40 des Abstandhalterrahmens aufzubringende Klebe- und Dichtmaterial auch im Eckbereich, der bekanntlich für die Dichtheit von Isolierglasscheiben von erheblicher Bedeutung ist, in der vollen Breite aufgebracht werden kann.In addition, it is provided in the bending device according to the invention that the front end of the holding-down device 20 and the bead-shaped extension 35 adjoining the inclined surfaces 36 thereon are made somewhat narrower than the clear distance between the mutually facing surfaces of the clamping jaws 3 and 4 of the clamp 2. Thus, the side walls 40 the hollow profile strip 53 to be bent is also supported from the inside during the bending process, as is indicated in the section of FIG. 7. This is particularly important when bending hollow profile strips 53 to form spacer frames for insulating glass panes, since the width of the side surfaces 40 of the hollow profile strip 53 should not be reduced as much as possible even in the corner region and these side surfaces 40 in the corner region should not be defined by the side surfaces 40 in the corner region Levels should deviate inwards so that the adhesive and sealing material to be applied to the side surfaces 40 of the spacer frame before the assembly of the insulating glass panes can also be applied in the full width in the corner region, which is known to be of considerable importance for the tightness of insulating glass panes.

Um den Niederhalter 20, insbesondere dessen wulstförmigen Ansatz 35, gegenüber der Klemmbacke 2 und damit gegenüber der Achse 37 (Fig. 5), um welche die Hohlprofilleiste 53 gebogen wird, richtig auszurichten, ist am Niederhalter 20 im Bereich seines vorderen Endes auf einer Seite eine gewinkelte Anschlagfläche 41 vorgesehen, die mit einer Stufe 42 an der feststehenden Klemmbacke 3 zusammenwirkt. Wenn die Anschlagfläche 41 an der Stufe 42 der Klemmbacke 3 anliegt, dann ist die Achse 37 des am vorderen Ende des Niederhalters 20 vorgesehenen, wulstförmigen Ansatzes 35 richtig ausgerichtet.In order to correctly align the hold-down device 20, in particular its bead-shaped extension 35, with respect to the clamping jaw 2 and thus with respect to the axis 37 (FIG. 5), about which the hollow profile strip 53 is bent, the hold-down device 20 is on one side in the region of its front end an angled stop surface 41 is provided which interacts with a step 42 on the fixed jaw 3. If the stop surface 41 abuts the step 42 of the clamping jaw 3, then the axis 37 of the bead-shaped extension 35 provided at the front end of the hold-down device 20 is correctly aligned.

Die erfindungsgemäße Vorrichtung zum Biegen besitzt noch einen Biegehebel 59 mit einem Biegeansatz 62, der um eine Achse verschwenkbar ist, die mit der Achse 37 des Wulstes 35 am vorderen Ende des Niederhalters 20 zusammenfällt, wenn dieser in seinerWirkstellung ist (die Flächen 41 liegen an den Flächen 42 der Klemmbacke 3 an). Der Verschwenkbereich des Biegehebels 59 ist nicht auf die in Fig. 3 gezeigten 90° beschränkt, sondern geht auch darüber hinaus, so daß nach dem Ausschwenken (Pfeil 28) und seitlichen Verschieben (Pfeil 29) des Niederhalters 20 auch spitze Winkel zwischen den beiden an die in der Hohlprofilleiste 53 erzeugte Ecke 61 angrenzenden Schenkel der Hohlprofilleiste 53 gebogen werden können.The bending device according to the invention also has a bending lever 59 with a bending attachment 62 which can be pivoted about an axis which coincides with the axis 37 of the bead 35 at the front end of the hold-down device 20 when it is in its active position (the surfaces 41 lie against the Surfaces 42 of the jaw 3). The pivoting range of the bending lever 59 is not limited to the 90 ° shown in Fig. 3, but also goes beyond, so that after swiveling (arrow 28) and lateral displacement (arrow 29) of the hold-down device 20 also acute angles between the two the corner 61 adjacent leg of the hollow profile bar 53 generated in the hollow profile bar 53 can be bent.

Bei Verwendung der Vorrichtung zum Abbiegen einer Hohlprofilleiste 53 zu einer Ecke 61 wird die Klemme 2 geöffnet und die Hohlprofilleiste 53 auf die oberen Führungsstifte 6 aufgelegt oder auf der Förderbahn 54 zu den Stiften 6 transportiert. Nach dem Schließen der Klemme 2, die Innenflächen der Klemmbacken 3 und 4 liegen dann an den Seitenflächen 40 an, wird der Niederhalter 20 in seine in den Fig. 3 und 6 gezeigte Wirkstellung bewegt und wölbt dabei die nach oben weisende Wand der Hohlprofilleiste 53 etwas nach unten ein. Hierauf wird durch Verschwenken des Biegehebels 59 der aus der Klemme 2 ragende Abschnitt 53' der Hohlprofilleiste 53 unter Ausbilden einer Ecke 61 verschwenkt. Soll der Winkel an der Ecke 61 ein spitzer sein, so wird der Niederhalter 20 zurückgeschwenkt und seitlich zurückgezogen, worauf das Biegen bis zum gewünschten Winkel fortgesetzt wird.When using the device for bending a hollow profile bar 53 to a corner 61, the clamp 2 is opened and the hollow profile bar 53 is placed on the upper guide pins 6 or transported on the conveyor track 54 to the pins 6. After closing the clamp 2, the inner surfaces of the jaws 3 and 4 are then on the side surfaces 40, the hold-down device 20 is moved into its operative position shown in FIGS. 3 and 6 and thereby bulges the upward-facing wall of the hollow profile strip 53 somewhat down one. Then, by pivoting the bending lever 59, the portion 53 'of the hollow profile bar 53 protruding from the clamp 2 is pivoted to form a corner 61. If the angle at the corner 61 is to be more acute, the hold-down device 20 is pivoted back and pulled back laterally, whereupon the bending is continued to the desired angle.

Wenn die Ecke 61 fertig gebogen ist, wird der Biegehebel 59 zurückgeschwenkt, die Klemme 2 geöffnet und die Hohlprofilleiste 53 vom Greifer 52 vorgeschoben, bis die Stelle der Hohlprofilleiste 53, in der die nächste Ecke 61 herzustellen ist, gegenüber dem Biegewerkzeug richtig ausgerichtet ist und dann, wie oben beschrieben, die nächste Ecke 61 gebogen. Dies wird fortgesetzt, bis ein Abstandhalterrahmen mitdergewünschten Anzahl der Ecken 61 - meist sind es vier - fertig gebogen ist.When the corner 61 is completely bent, the bending lever 59 is pivoted back, the clamp 2 is opened and the hollow profile bar 53 is advanced by the gripper 52 until the location of the hollow profile bar 53 in which the next corner 61 is to be produced is correctly aligned with the bending tool and then, as described above, the next corner 61 is bent. This continues until a spacer frame with the desired number of corners 61 - usually four - is finished.

Der Vorschub der Hohlprofilleiste 53 mit der in den Fig. 1 und 2 gezeigten Vorrichtung geht wie folgt vor sich:

  • Die von der Förderbahn 54 am unteren Rand der StĂĽtzwand 60 herangeförderte Hohlprofilleiste 53 fährt zum Endanschlag 57. Die Hohlprofilleiste 53 befindet sich damit in einer "Null"-Position, Zugleich hält der am Schlitten 51 montierte Greifer 52 die Hohlprofilleiste 53 in ihrer Lage fest. Der Anschlag 57 wird nun in die Förderbahn 54 versenkt und der Schlitten 51 mit dem vom Greifer 52 festgeklemmten Profil 53 verfährt nun in Richtung des Biegehebels 59 genau um jene Wegstrecke, die ein ProzeĂźrechner vorgibt und die der Länge des Rahmenschenkels entspricht. Die effektiv gefahrene Länge wird von einem Inkrementalgeber 56 bestimmt. Erreicht der Schlitten 51 den Endpunkt seiner vorgegebenen und effektiv gemessenen Bewegung, biegt der Biegehebel 59 den ĂĽberstehenden Abschnitt 53' entlang der nach rĂĽckwärts geneigten StĂĽtzwand 60 um den von einem ProzeĂźrechner vorgegebenen Winkel nach oben.
The advance of the hollow profile bar 53 with the device shown in FIGS. 1 and 2 proceeds as follows:
  • The hollow profile bar 53 conveyed by the conveyor track 54 at the lower edge of the support wall 60 moves to the end stop 57. The hollow profile bar 53 is thus in a “zero” position. At the same time, the gripper 52 mounted on the slide 51 holds the hollow profile bar 53 in place. The stop 57 is now sunk into the conveyor track 54 and the slide 51 with the profile 53 clamped by the gripper 52 now moves in the direction of the bending lever 59 exactly by the distance that a process computer specifies and that corresponds to the length of the frame leg. The effectively traveled length is determined by an incremental encoder 56. When the slide 51 reaches the end point of its predetermined and effectively measured movement, the bending lever 59 bends the protruding section 53 'upward along the backward inclined support wall 60 by the angle predetermined by a process computer.

Die genaue Messung der vom Schlitten 51 gefahrenen Wegstrecke ermittelt ein Inkrementalgeber 56, und die Bewegung des Schlittens 51 wird ĂĽber diesen gesteuert. Der Inkrementalgeber 56 ist am Antriebsmotor 55 oder an der Bewegung 54 des Schlittens 51 montiert.An incremental encoder 56 determines the exact measurement of the distance traveled by the carriage 51, and the movement of the carriage 51 is controlled by the latter. The incremental encoder 56 is mounted on the drive motor 55 or on the movement 54 of the slide 51.

Der Schlitten 51 wird beispielsweise von einem Endlos-Zahnriemen angetrieben, und ist auf einer parallel zur Förderbahn 54 verlaufenden Führung geführt.The carriage 51 is driven by an endless toothed belt, for example, and is guided on a guide running parallel to the conveyor track 54.

Der Eingriff des Zahnriemens in das Antriebszahnrad des Antriebsmotors 55 ist exakt und spielfrei, so daß auch ein unmittelbar an der Motor-GetriebeEinheit montierter Inkrementalgeber 56 die gefahrene Wegstrecke des Schlittens 51 genau registrieren kann. Die effektiv zu fahrende Strecke des Schlittens 51 entspricht jener Profillänge, welche der Prozeßrechner für einen Biegevorgang bestimmt.The engagement of the toothed belt in the drive gear of the drive motor 55 is exact and free of play, so that an incremental encoder 56 mounted directly on the motor / gear unit can also accurately register the distance traveled by the slide 51. The effective travel distance of the slide 51 corresponds to the profile length which the process computer determines for a bending process.

Gleich vorteilhaft ist auch die Anwendung einer Zahnstange, die an der FĂĽhrung des Schlittens 51 montiert ist. Bei dieser alternativ anwendbaren Einrichtung muĂź der Antriebsmotor 55 nicht ortsfest montiert sein, sondern kann auch am Schlitten 51 angeordnet sein. Das Antriebszahnrad des Antriebsmotors 55 greift dann in die an der FĂĽhrung 54 des Schlittens 51 befestigte Zahnstange ein, wobei ein Inkrementalgeber 56 ebenfalls am Antriebsmotor 55 oder am Schlitten 51 montiert sein kann.The use of a toothed rack which is mounted on the guide of the slide 51 is equally advantageous. In this alternatively applicable device, the drive motor 55 does not have to be fixed in place, but can also be arranged on the slide 51. The drive gear of the drive motor 55 then engages in the toothed rack fastened to the guide 54 of the slide 51, it being possible for an incremental encoder 56 to also be mounted on the drive motor 55 or on the slide 51.

Während der Biegehebel 59 die Hohlprofilleiste 53 abbiegt und dieses von den Backen 3 und 4 gehalten wird, löst sich der am Schlitten 51 montierte Greifer 52. Der Schlitten 51 fährt dann mit hoher Geschwindigkeit in die Ausgangslage (Referenzpunkt) zurück. Dann erfaßt der Greifer 52 die Hohl profilleiste 53 wieder und der Schlitten 51 fährt nach dem Biegevorgang wieder genau um die vom Prozeßrechner vorgegebene Wegstrecke vor, wobei er die Hohlprofilleiste 53 schlupffrei vorschiebt.While the bending lever 59 bends the hollow profile bar 53 and this is held by the jaws 3 and 4, the gripper 52 mounted on the slide 51 is released. The slide 51 then moves back to the starting position (reference point) at high speed. Then the gripper 52 detects the hollow profile bar 53 again and the slide 51 moves back exactly after the bending process by the distance specified by the process computer, whereby it advances the hollow profile bar 53 without slippage.

Wenn die Hohlprofilleiste 53 in die Vorrichtung von einer dieser vorgeschalteten Zuführeinrichtung bis zum Anschlag 57 zugeführt wird, kann die Förderbahn 54 eine einfache Gleitbahn sein.If the hollow profile strip 53 is fed into the device from a feed device upstream of this up to the stop 57, the conveyor track 54 can be a simple slideway.

Der Ablauf der Arbeitsschritte beim Herstellen einess rechteckigen Abstandhalterrahmens wird im folgenden beispielsweise an Hand Fig. 9 in mehr Einzelheiten beschrieben:The sequence of the steps in the manufacture of a rectangular spacer frame is described in more detail below, for example using FIG. 9:

Eine Hohlprofilleiste 53 wird von einer Fördervorrichtung, die beispielsweise der Schlitten 51 mit dem Greifer 52 sein kann, beispielsweise ausgehend von der Referenzlage, die durch den beschlag 57 bestimmt ist, so weit vorgeschoben, daß der über den Niederhalter 20 überstehende Abschnitt 53' der Hohlprofilleiste 53 der um eine bestimmte Strecke "x" verminderten Länge des ersten Schenkels des herzustellenden Abstandhalterrahmens entspricht. Diese Stellung ist in Fig. 9b gezeigt. Nun legen sich die Backen 3 und 4 an die Hohlprofilleiste 53 an und der Schlitten 51 kehrt in seine Ausgangsstellung, die in Fig. 9a gezeigt ist, zurück. Nachdem diese Rückbewegung des Schlittens 51 beendet ist, oder noch während derselben, wird der Abschnitt 53' um den Niederhalter 20 in Richtung des Pfeiles in Fig. 9b vom Biegehebel 59 nach oben abgebogen. Nachdem der Biegevorgang beendet ist, wird die Hohlprofilleiste 53 von den Backen 3 und 4 freigegeben und der Schlitten 51 bewegt sich mit von den beiden Seiten oder von oben und unten her an die Hohlprofilleiste 53 angelegtem Greifer 52 in die in Fig. 9c gezeigte Stellung vor, wobei er die Hohlprofilleiste 53 so weit vorschiebt, daß die nächste (zweite) Stelle, in der in der Hohlprofilleiste 53 eine Ecke 61 zu erzeugen ist, gegenüber dem Niederhalter 20 ausgerichtet ist. Nun schließen sich die Backen 3 und 4 wieder und halten die Hohlprofilleiste 53 unverschiebbar fest und der nächste (zweite) Biegevorgang wird mit Hilfe des Biegehebels 59 ausgeführt, während der Schlitten 51 wieder in seine Ausgangsstellung zurückkehrt. Nachdem der zweite Biegevorgang beendet ist, bewegt sich der Schlitten 51 mit an der Hohlprofilleiste 53 angelegten Greifer 52 um eine Strecke vor, die der Länge des nächsten Schenkels des herzustellenden Abstandhalterrahmens entspricht, so daß die nächste (dritte) Biegestelle gegenüber dem Niederhalter 20 ausgerichtet ist. Es schließen sich die Klemmbacken 3,4 wieder und halten die Hohlprofilleiste 53 fest, worauf der dritte Biegevorgang ausgeführt wird.A hollow profile bar 53 is so far advanced by a conveying device, which can be, for example, the slide 51 with the gripper 52, for example, starting from the reference position, which is determined by the fitting 57, that the section 53 'projecting over the hold-down device 20 is the hollow Profile bar 53 corresponds to the length of the first leg of the spacer frame to be produced, which length is reduced by a certain distance "x". This position is shown in Fig. 9b. Now the jaws 3 and 4 lie against the hollow profile bar 53 and the slide 51 returns to its starting position, which is shown in FIG. 9a. After this return movement of the slide 51 has ended, or still during the same, the section 53 ′ around the hold-down device 20 is bent upwards by the bending lever 59 in the direction of the arrow in FIG. 9b. After the bending process has ended, the hollow profile bar 53 is released from the jaws 3 and 4 and the slide 51 moves forward with the gripper 52 placed on the hollow profile bar 53 from both sides or from above and below into the position shown in FIG. 9c , whereby it advances the hollow profile bar 53 so far that the next (second) location in which a corner 61 is to be created in the hollow profile bar 53 is aligned with the hold-down device 20. Now the jaws 3 and 4 close again and hold the hollow profile bar 53 immovably and the next (second) bending process is carried out with the aid of the bending lever 59, while the slide 51 returns to its starting position. After the second bending process has ended, the slide 51 moves forward with the grippers 52 applied to the hollow profile bar 53 by a distance which corresponds to the length of the next leg of the spacer frame to be produced, so that the next (third) bending point is aligned with the hold-down device 20 . The clamping jaws 3, 4 close again and hold the hollow profile strip 53 firmly, whereupon the third bending process is carried out.

Nachdem der dritte Biegevorgang beendet ist, lösen sich die Backen 3 und 4 wieder von der Hohlprofitteiste 53 und der Schlitten 51 bewegt sich wieder mit an die Hohlprofilleiste 53 angelegtem Greifer 52 so weit vor, daß die nächste (vierte) Biegestelle gegenüber dem Niederhalter 20 genau ausgerichtet ist.After the third bending process has ended, the jaws 3 and 4 are released again from the hollow profile bar 53 and the slide 51 moves again with the gripper 52 applied to the hollow profile bar 53 so far that the next (fourth) bending point relative to the hold-down device 20 is accurate is aligned.

Beim Herstellen eines rechteckigen Abstandhalterrahmens, wie dies in Fig. 9 gezeigt ist, entspricht dieser Hub genau dem Hub vor der Ausführung des zweiten Biegevorganges. Nachdem der Vorschub der Hohlprofilleiste 53 wie beschrieben ausgeführt worden ist und die nächste Biegestelle (die vierte) gegenüber dem Niederhalter 20 ausgerichtet worden ist, schließen sich die Backen 3 und 4 wieder und halten die Hohlprofilleiste 53 fest. Nun wird die Hohlprofilleiste 53 an der durch den Pfeil 170 gekennzeichneten Stelle (Fig. 9e) abgeschnitten. Die Länge des so erhaltenen in Fig. 9e links vom Niederhalter 20 befindlichen Stückes der Hohlprofilleiste 53 entspricht genau der vorbestimmten Strecke "x", um welche die Hohlprofilleiste 53 vor dem ersten Biegevorgang (Fig. 9b) weniger weit vorgeschoben wurde als der Länge des ersten Schenkels (Fig. 9b) entspricht.When producing a rectangular spacer frame, as shown in Fig. 9, this stroke corresponds exactly to the stroke before the execution of the second bending process. After the advance of the hollow profile bar 53 has been carried out as described and the next bending point (the fourth) has been aligned with the hold-down device 20, the jaws 3 and 4 close again and hold the hollow profile bar 53 in place. Now the hollow profile strip 53 is cut off at the point indicated by the arrow 170 (FIG. 9e). The length of the piece of hollow profile bar 53 thus obtained in FIG. 9e to the left of the hold-down device 20 corresponds exactly to the predetermined distance "x" by which the hollow profile bar 53 was advanced less than the length of the first before the first bending process (FIG. 9b) Leg (Fig. 9b) corresponds.

Nun wird der vierte Biegevorgang ausgefĂĽhrt, wobei das vordere Ende 172 der zugefĂĽhrten Hohlprofilleiste 53 und/oder der Abschnitt 173 des teilweise fertiggestellten Abstandhalterrahmens aus der Biegeebene ausgelenkt werden oder einfach das vordere Ende 172 nach unten bewegt wird, damit der vierte Biegevorgang nicht behindert wird.Now the fourth bending process is carried out, the front end 172 of the supplied hollow profile bar 53 and / or the section 173 of the partially finished spacer frame being deflected out of the bending plane or the front end 172 simply being moved down so that the fourth bending process is not hindered.

Nachdem der vierte Biegevorgang beendet ist, wird der bis auf das Verbinden der beiden an der Stoßstelle 171 (Fig. 9f) aneinandergrenzenden Enden der Hohl profilleiste 53 fertiggestellte Abstandhalterrahmen aus der Vorrichtung abtransportiert, nachdem die Backen 3 und 4 wieder gelöst und der Niederhalter 20 aus der Biegeebene entfernt worden sind. Die an der Stoßstelle 171 aneinandergrenzenden Enden der zum Abstandhalterrahmen gebogenen Hohlprofilleiste 53 werden durch Einstecken eines Verbinders oder durch Stumpfverschweißen miteinander verbunden. Eine hiezu geeignete Schweißvorrichtung ist beispielsweise aus der EP-A-0 192 921 bekannt.After the fourth bending process has ended, the spacer frame, apart from the connection of the two ends of the hollow profiled strip 53 adjoining each other at the joint 171 (FIG. 9f), is removed from the device after the jaws 3 and 4 are released again and the hold-down device 20 is removed the bending plane have been removed. The adjoining ends of the hollow profile strip 53 bent to form the spacer frame at the joint 171 are connected to one another by inserting a connector or by butt welding. A welding device suitable for this purpose is known for example from EP-A-0 192 921.

Wenn mit der an Hand der Fig. 1 bis 8 beschriebenen Vorrichtung in Hohlprofilleisten 53 gekrümmte Abschnitte 71 erzeugt werden sollen, wird in den Träger 21 des Werkzeuges ein Niederhalter 80 eingesetzt, der an seinem freien, der Hohlprofilleiste 53 zugekehrten Ende eine frei drehbare Rolle 70 (Fig. 10 bis 17) aufweist. Durch diese Rolle 70 wird die Hohlprofilleiste 53, die zwischen den Backen 3 und 4 geführt ist - d.h. die Backen 3 und 4 klemmen die Hohlprofilleiste 53 nicht mehr - gegen die als Abstützung von unten dienenden Führungsstangen 6 gehalten.If curved sections 71 are to be produced in hollow profile strips 53 with the device described with reference to FIGS. 1 to 8, a hold-down device 80 is inserted into the carrier 21 of the tool and has a freely rotatable roller 70 at its free end facing the hollow profile strip 53 (Fig. 10 to 17). Through this roller 70, the hollow profile bar 53, which is guided between the jaws 3 and 4 - i.e. the jaws 3 and 4 no longer clamp the hollow profile strip 53 - held against the guide rods 6 serving as support from below.

Insbesondere wenn Abstandhalterrahmen mit wenigstens einer Ecke 61 und mit wenigstens einem gekrümmten Abschnitt 71 hergestellt werden sollen (vgl. Fig. 22), kann auch mit einem Niederhalter ohne frei drehbare Rolle 70, d.h. mit einem Niederhalter 20, wie er in Fig. 3 bis 8 gezeigt ist, gearbeitetwerden, der an seinem vorderen Ende einen Ansatz ähnlich oder identisch dem Ansatz 35 aufweist, oder der wie weiter unten mit Bezug auf die Fig. 19 bis 21 beschrieben ist, ausgebildet ist.In particular if spacer frames with at least one corner 61 and with at least one curved section 71 are to be produced (see FIG. 22), it is also possible to use a hold-down device without a freely rotatable roller 70, i.e. with a hold-down device 20, as shown in FIGS. 3 to 8, which has a lug at its front end similar or identical to the lug 35, or as described further below with reference to FIGS. 19 to 21, is trained.

Der Biegehebel 59 wird beim Erzeugen von gekrümmten Abschnitten 71 in Hohlprofilleisten 53 gegenüber der Förderrichtung der Hohlprofilleiste 53 entsprechend dem gewünschten Krümmungsradius so schräg gestellt, so daß die zwischen den Backen 3 und 4 austretende Hohlprofilleiste 53 vom Biegeansatz 62 am Biegehebel 59 nach oben abgelenkt und dabei kontinuierlich gekrümmt wird.The bending lever 59 is so inclined when generating curved sections 71 in hollow profile strips 53 with respect to the conveying direction of the hollow profile strip 53 according to the desired radius of curvature, so that the hollow profile strip 53 emerging between the jaws 3 and 4 is deflected upwards by the bending attachment 62 on the bending lever 59 and thereby is continuously curved.

Wesentlich fĂĽr das erfolgreiche Biegen der Hohlprofilleiste 53 zu einem gekrĂĽmmten Abschnitt 71 derselben ist es, daĂź diese vom Greifer 51 im wesentlichen kontinuierlich und genau um das dem gekrĂĽmmten Abschnitt 71 der Hohlprofilleiste 53 entsprechende StĂĽck vorgeschoben wird.It is essential for the successful bending of the hollow profile bar 53 to a curved section 71 of the same that the gripper 51 pushes it essentially continuously and exactly around the piece corresponding to the curved section 71 of the hollow profile bar 53.

Die Breite der Rolle 70 ist, wie insbesondere Fig. 16 zeigt, etwas schmäler als die Breite der zu krümmenden Hohlprofilleiste 53, so daß die Innenwand der Hohlprofilleiste 53, wie ebenfalls aus Fig. 16 ersichtlich, während des Krümmvorganges nach innen verformt wird. Dadurch wird die Stauchung der Innenwand der Hohlprofilleiste 53 verringert, so daß sich eine weitgehend glatte Innenwand im gekrümmten Abschnitt 71 der Hohlprofilleiste 53 ergibt.16, the width of the roller 70 is somewhat narrower than the width of the hollow profile strip 53 to be curved, so that the inner wall the hollow profile bar 53, as can also be seen from FIG. 16, is deformed inward during the curving process. This reduces the compression of the inner wall of the hollow profile bar 53, so that there is a largely smooth inner wall in the curved section 71 of the hollow profile bar 53.

Eine besonders günstige Ausführungsform eines Greifers 51, der den nötigen Reibungsschluß für den genauen Vorschub der zu krümmenden Hohlprofilleiste 53 sicherstellt, ist in Fig. 18 gezeigt. Es ist ersichtlich, daß die untere Backe 75 mit einem in Förderrichtung auf wenigstens einer Führungsschiene geführten Schlitten 76 starr verbunden ist, wogegen die obere Backe 77 über Parallelogrammlenker 78 durch einen Druckmittelmotor 79 gegenüber der Backe 75 wegschwenkbar ist. Die bewegliche Backe 77 kann daher hinter die Stützwand 60 der Vorrichtung verschwenkt werden, so daß sie den Abtransport eines fertig gebogenen Abstandhalterrahmens nicht behindert.A particularly favorable embodiment of a gripper 51, which ensures the necessary frictional engagement for the precise advancement of the hollow profile strip 53 to be curved, is shown in FIG. 18. It can be seen that the lower jaw 75 is rigidly connected to a carriage 76 guided in the conveying direction on at least one guide rail, whereas the upper jaw 77 can be pivoted away from the jaw 75 via parallelogram link 78 by a pressure medium motor 79. The movable jaw 77 can therefore be pivoted behind the support wall 60 of the device so that it does not hinder the removal of a finished bent spacer frame.

Wie bereits weiter oben angedeutet, kann derAnschlag 57, bezogen auf die Förderrichtung der Hohlprofilleiste 53 vor dem Werkzeug mit dem Niederhalter 20 oder 80 und dem Biegehebel 59 angeordnet sein. Bevorzugt ist der Anschlag 57 mit einem Endschalter ausgestattet und befindet sich, bezogen auf die Förderrichtung der Hohlprofilleiste 53, nach dem vom Werkzeug entfernten Ende des Hubes des Greifers 51. Auf diese Art und Weise kann eine Hohlprofilleiste 53 in die Vorrichtung bis zum beschlag 57 gefördert werden, worauf dessen Schalter betätigt wird und durch eine Folgeschaltung gesteuert, der Greifer 51 die Hohlprofilleiste 53 in einer genau definierten Lage übernimmt.As already indicated above, the stop 57, based on the conveying direction of the hollow profile bar 53, can be arranged in front of the tool with the hold-down device 20 or 80 and the bending lever 59. The stop 57 is preferably equipped with a limit switch and is located in relation to the conveying direction of the hollow profile bar 53 after the end of the stroke of the gripper 51 that is remote from the tool. In this way, a hollow profile bar 53 can be conveyed into the device up to the fitting 57 are, whereupon the switch is actuated and controlled by a sequential circuit, the gripper 51 takes over the hollow profile bar 53 in a precisely defined position.

Es ist ersichtlich, daß durch Austausch des Niederhalters 80 mit der Rolle 70 durch den Niederhalter 20 der in den Fig. 1 bis 8 gezeigten Ausführungsform Abstandhalterrahmen mit wenigstens einer scharf geknickten Ecke mit beliebigen Winkeln zwischen den an die Ecke 61 angrenzenden Schenkeln des Abstandhalterrahmens und mit wenigstens einem gekrümmten Abschnitt 71 aus ein- und derselben Hohlprofilleiste 53 erzeugt werden können.It can be seen that by replacing the hold-down 80 with the roller 70 by the hold-down 20 of the embodiment shown in FIGS. 1 to 8, spacer frames with at least one sharply bent corner with any angle between the legs of the spacer frame adjacent to the corner 61 and with at least one curved section 71 can be produced from one and the same hollow profile strip 53.

Um den Werkzeugwechsel (Austausch des Niederhalters 80 mit der Rolle 70 gegen den Niederhalter 20 ohne Rolle) zu vermeiden, können am Träger 21 sowohl ein Niederhalter 80 als auch ein Niederhalter 20 montiert sein. Diese Werkzeuge werden dann fallweise in die Wirklage, die zu den Backen 3 und 4 symmetrisch ist, bewegt. Dies stellt keine Schwierigkeiten dar, da der Träger 21, wie weiter oben an Hand der Fig. 1 bis 8 beschrieben, anhebbar und quer zur Biegeebene verstellbar ist.In order to avoid changing the tool (exchange of the hold-down 80 with the roller 70 for the hold-down 20 without a roller), both a hold-down 80 and a hold-down 20 can be mounted on the carrier 21. These tools are then occasionally moved into the active position, which is symmetrical to the jaws 3 and 4. This is not a problem, since the carrier 21, as described above with reference to FIGS. 1 to 8, can be raised and adjusted transversely to the bending plane.

Die in den Fig. 19 bis 21 dargestellte Vorrichtung entspricht im wesentlichen der an Hand der Fig. 10 bis 17 beschriebenen Vorrichtung, jedoch ist im Niederhalter 80 anstatt der frei drehbaren Rolle 70 ein Gleitstück 81 eingesetzt, durch das die Innenwand der Hohlprofilleiste 53, wie aus Fig. 21 ersichtlich, während des Krümmens nach innen verformt wird.The device shown in FIGS. 19 to 21 corresponds essentially to the device described with reference to FIGS. 10 to 17, but instead of the freely rotatable roller 70, a slide 81 is inserted in the hold-down device 80, through which the inner wall of the hollow profile strip 53, such as can be seen from Fig. 21, is deformed inward during the bending.

Die an Hand der Fig. 10 bis 21 beschriebenen Vorrichtungen können, wenn nichts anderes erwähnt worden ist, so wie die an Hand der Fig. 1 bis 8 beschriebene Vorrichtung ausgeführt sein und auch wie in Fig. 9 gezeigt, verwendet werden.Unless otherwise mentioned, the devices described with reference to FIGS. 10 to 21 can be designed like the device described with reference to FIGS. 1 to 8 and also as shown in FIG. 9.

Sowohl der Niederhalter 80 mit der Rolle 70, als auch der Niederhalter 20 mit seinem Ansatz 35 sind in Förderrichtung, d.h. parallel zu einer die Führungsstifte 6 verbindenden Ebene verstellbar. Damit kann die Stellung der Niederhalter den geometrischen Verhältnissen angepaßt werden, die sich nach dem Ändern der Winkellage des Hebels 50 mit der Auflauffläche 62 ergeben.Both the hold-down device 80 with the roller 70 and the hold-down device 20 with its extension 35 are in the conveying direction, i.e. adjustable parallel to a plane connecting the guide pins 6. The position of the hold-down devices can thus be adapted to the geometric conditions which result after changing the angular position of the lever 50 with the run-up surface 62.

Mit dem erfindungsgemäßen, mit einem Niederhalter 20 mit Ansatz 35 oder einem Niederhalter 80 mit Ansatz 81 ausgestatteten Biegewerkzeug können Hohlprofilleisten 53 auch zu Abstandhalterrahmen für Isolierglasscheiben gebogen werden, die wenigstens eine scharfkantig abgewinkelte Ecke 61 und wenigstens einen beispielsweise nach einem Teilkreisbogen gekrümmten Abschnitt 71 aufweisen. Ein Beispiel für einen solchen Rahmen ist in Fig. 22 gezeigt. Von Vorteil ist dabei, daß mit der erfindungsgemäßen Vorrichtung, soferne der Niederhalter 20 mit dem Ansatz 35 oder der Niederhalter 80 mit dem Ansatz 81 verwendet wird, auch ohne Werkzeugwechsel scharfkantige Eckenbeim Erzeugen dieser Ecken ist der Vorschub für die Hohlprofilleiste 53 beim Hochbewegen des Biegehebels 59 stillgesetzt - als auch (kreisbogenförmig) gekrümmte Abschnitte - dabei wird der Vorschub für die Hohlprofilleiste 53 bei mehr oder wenig stark hochgeschwenktem Biegehebel 59 mit der Auflauffläche 62 betätigt - hergestellt werden können.With the bending tool according to the invention, equipped with a hold-down device 20 with attachment 35 or a hold-down device 80 with attachment 81, hollow profile strips 53 can also be bent to form spacer frames for insulating glass panes which have at least one sharp-angled corner 61 and at least one section 71, for example curved according to a partial arc. An example of such a frame is shown in FIG. 22. It is advantageous that with the device according to the invention, provided that the hold-down device 20 with the attachment 35 or the hold-down device 80 with the attachment 81 is used, even without a tool change, sharp-edged corners when generating these corners is the feed for the hollow profile bar 53 when the bending lever 59 is moved up stopped - as well as (arc-shaped) curved sections - the feed for the hollow profile bar 53 is actuated with the bending lever 59 actuated more or less strongly with the run-up surface 62 - can be produced.

Claims (22)

1. Method of obtaining continuously curved portions (71) in hollow-section strip, in which the hollow-section strip (53) is advanced, with support from below, under a holding-down clamp (20, 80) between guide jaws (3, 4) and, subsequent to the holding-down clamp (20, 80), is deflected out of the feed direction of the hollow-section strip (53) by means of a ramp surface (62) of a bending lever (59) oriented obliquely to the said feed direction, characterised in that during the curving procedure the ramp surface (62) is stationary in its operative position, and in that the wall of the hollow-section strip (53) on the external side of the curve slides along the obliquely-positioned ramp surface (62) during the entire curving procedure.
2. Method according to claim 1, characterised in that, during curving of the hollow-section strip (53) the wall of the said hollow-section strip (53) on the inside of the curve is deformed by the holding-down clamp (20, 80) in the direction of the wall of the. hollow-section strip (53) on the outside of the curve.
3. Method according to claim 1 or 2, characterised in that the radius of curvature is set by the degree of deflection of the hollow-section strip (53).
4. Method according to one of claims 1 to 3, characterised in that the length of the curved portion (71) of the hollow-section strip (53) is set by the degree of feed advance of the hollow-section strip, with deflection of the hollow-section strip (53) after the holding-down clamp (20, 80).
5. Method for producing spacerframes for insulated glass panels having at least one curved portion (71) and at least one sharply-angled corner (61), characterised in that, when producing the arcuate curved portion (71), the hollow-section strip (53) is advanced under the holding-down clamp (20, 80) between guide jaws (3, 4), and the hollow-section strip (53) is deflected after the holding-down clamp (20, 80), using the method according to one of claims 1 to 4, out of the plane of conveyance of the hollow-section strip (53), and in that, in order to produce a sharply-angled corner (61) in the hollow-section strip (53) the portion of the hollow-section strip (53) projecting beyond the holding-down clamp (20, 80) is bent at an angle, the bending lever (59) being pivoted, with the ramp surface (62) abutting against the projection portion of the hollow-section strip (53), through the desired angle, the said hollow-section strip (53) being stationary.
6. Device for producing curved portions (71) in hollow-section strip (53), more particularly during the production of spacer frames for insulated glass panels, with a substantially horizontal conveyor path (54), with a feed device (51, 52) associated with said conveyor path (54) for conveying the hollow-section strip (53) to a tool which has two guide jaws (3, 4) between which the hollow-section strip (53) is received, with a holding-down clamp (20, 80) for the hollow-section strip (53), the forward end of said clamp abutting when in its operative position against the inner wall facing it of the hollow-section strip (53), and with a lever (59) which may be pivoted upward out of the feed direction, with a ramp surface (62) forthe hollow-section strip (53), characterised in that the conveyor path (54) is located at the lower end of a (lateral) support surface (69) for the at least one curved portion (71) of the hollow-section strip (53), in that the guide jaws (3, 4) are disposed on either side of the hollow-section strip (53), in that the holding-down clamp (20,80) is disposed to be movable and when in its operative position engages with its forward end (35, 70, 81) between the guide jaws (3, 4), so that the forward end (35, 70, 81) of the holding-down clamp (20, 80) may be applied against the inner wall of the hollow-section strip, and in that the bending lever (59) with the ramp surface (62) may be secured in angular positions at will relative to the feed direction of the hollow-section strip (53), for the hollow-section strip (53) emerging from the guide jaws (3, 4).
7. Device according to claim 6, characterised in that the holding-down clamp (20, 80) has, with respect to the two guide jaws (3, 4), a degree of play, and thus may be applied against the inner wall of the hollow-section strip (53), and in that the inner wall is deformed during the curving procedure in the direction of the outer wall of the hollow-section strip (53).
8. Device according to claim 6 or 7, characterised in that the feed device is a gripper (52) which may engage on the hollow-section strip (53), and which is movable to and fro on a carriage (51) parallel to the feed direction of the hollow-section strip (53), engaging, during its movement towards the tool, on the hollow-section strip (53).
9. Device according to claim 8, characterised in that the gripper (52) has jaws (77, 75) which may be applied from above and from below to the hollow-section strip (53).
10. Device according to claim 9, characterised in that the lower jaw (75) of the gripper (52) is rigidly attached on the carriage (51), and the upper jaw (77) of the gripper (52) is movably mounted on the carriage (51).
11. Device according to claim 10, characterised in that the movable jaw (75) is mounted via parallelogram guides (78) on a carriage (76).
12. Device according to one of claims 6 to 11, characterised in that the holding-down clamp (20, 80) is secured on a carriage (21) which is adjustable both in or parallel to the plane of symmetry of the guide jaws (3, 4) and also perpendicularly to this plane of symmetry, in order to move the holding-down clamp (20, 80) out of the bending plane.
13. Device according to claim 12, characterised in that the carriage (21) for the holding-down clamp (20, 80) is pivotable about an axis (26) perpendicular to the plane of symmetry of the guide jaws (3, 4).
14. Device according to claim 12 or 13, characterised in that the carriage (21) for the holding-down clamp (20, 80) is movably guided in a holder (31) perpendicularly to the plane of symmetry of the guide jaws (3, 4).
15. Device according to one of claims 12 to 14, characterised in that the carriage (21) for the holding-down clamp (20, 80) is mounted on a lever (25), which is mounted on the device to pivot about an axis (26) perpendicular to the plane of symmetry of the guide jaws (3, 4).
16. Device according to one of claims 12 to 15, characterised in that the holding-down clamp (20, 80) is attached on its carriage (21) so as to be exchangeable.
17. Device according to one of claims 6 to 16, characterised in that the holding-down clamp (20, 80) carries a slider (35, 81) on its forward end.
18. Device according to one of claims 5 to 16, characterised in that the holding-down clamp (20, 80) carries a freely rotatable roller (70) on its forward end.
19. Device according to one of claims 12 to 18, characterised in that there are mounted on the carriage (21), as optionally usable holding-down clamps, a holding-down clamp (20) which carries on its forward end a slider (35, 81) abutting against the hollow-section strip (53), and a holding-down clamp (80), which carries on its forward end a freely rotatable roller (70), said holding-down clamps (20, 80) being alternately and optionally adjustable into their operative position engaging between the guide jaws (3, 4).
20. Device according to one of claims 17 to 19, characterised in that the slider (35, 81) or the roller (70) is narrower than the hollow-section strip (53).
21. Device according to one of claims 17, 19 or 20, characterised in that the slider (35, 81) is curved or rendered convex about at least one axis perpendicular to the feed direction and to the bending plane.
22. Device according to one of claims 17 to 21, characterised in that the slider (81) or the roller (70) are interchangeably attached to the holding-down clamp (20, 80).
EP91890106A 1990-05-21 1991-05-15 Method and apparatus for obtaining curved parts in hollow section strips Expired - Lifetime EP0459971B2 (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
AT112690A AT397054B (en) 1990-05-21 1990-05-21 DEVICE FOR BENDING HOLLOW PROFILE STRIPS
AT112690 1990-05-21
AT1126/90 1990-05-21
AT184090A AT397775B (en) 1990-09-10 1990-09-10 Bending device for holder profile rails - incorporates displaceable grab for rails
AT184090 1990-09-10
AT1840/90 1990-09-10
AT198790A AT405912B (en) 1990-10-02 1990-10-02 Method and apparatus for bending hollow sectional strips
AT198790 1990-10-02
AT1987/90 1990-10-02

Publications (3)

Publication Number Publication Date
EP0459971A1 EP0459971A1 (en) 1991-12-04
EP0459971B1 true EP0459971B1 (en) 1994-03-09
EP0459971B2 EP0459971B2 (en) 2001-12-12

Family

ID=27147132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91890106A Expired - Lifetime EP0459971B2 (en) 1990-05-21 1991-05-15 Method and apparatus for obtaining curved parts in hollow section strips

Country Status (7)

Country Link
EP (1) EP0459971B2 (en)
JP (1) JPH0768322A (en)
AT (1) ATE102513T1 (en)
DE (2) DE59101137D1 (en)
DK (1) DK0459971T3 (en)
ES (1) ES2051110T5 (en)
NO (1) NO179493C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK282090A (en) * 1990-11-28 1992-05-29 Skovgaard & Co As PROCEDURE AND APPARATUS FOR MANUFACTURING CLOSED DISTRIBUTION FRAMES OF HOLE THICKWICKED PROFILES
DE4214205A1 (en) * 1992-04-30 1993-11-04 Happich Gmbh Gebr Installation for bending segments of profiled bars etc. - with additional bending station on tables movable in additional directions
ATE146388T1 (en) * 1992-07-16 1997-01-15 Peter Lisec DEVICE FOR PRODUCING SPACER FRAMES FOR INSULATING GLASS PANELS FROM HOLLOW PROFILE STRIPS
AT406236B (en) * 1995-10-31 2000-03-27 Lisec Peter DEVICE FOR BENDING OR CURVING HOLLOW PROFILES
DE10137766A1 (en) * 2001-08-03 2003-02-27 Lenhardt Maschinenbau Device for bending hollow profile bars
DE10236407B4 (en) * 2002-08-02 2007-09-27 Lenhardt Maschinenbau Gmbh Device for bending hollow profiled bars
CA2924182C (en) * 2015-04-02 2022-12-06 Lombarda Macchine S.A.S. Di G.B. Lattuada & C. Method for automatically bending spacer elements for insulating glass panes - double glazings and machine for carrying out the method
CN111531858A (en) * 2020-05-12 2020-08-14 周立 Automobile glass clamping strip bending device

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US3885412A (en) * 1973-11-21 1975-05-27 Lawrence T Vance Method of fabricating curved tubing and product thereof
AT360311B (en) * 1978-09-26 1980-01-12 Seraphin Puempel & Soehne Kg BENDING DEVICE FOR PRODUCING A DISTANCE HOLDER FOR INSULATING GLASS DISCS
CH647428A5 (en) * 1980-08-15 1985-01-31 Haeusler Ag Chr Process for bending a sectional bar, apparatus for supporting portions of a sectional bar relative to one another and multi-roll bending machine
CH660398A5 (en) * 1982-01-21 1987-04-15 Peter Lisec SPACER FRAME FOR INSULATING GLASS PANELS AND METHOD FOR PRODUCING THE SAME AND DEVICE FOR IMPLEMENTING THE METHOD.
DE3312764A1 (en) * 1983-04-09 1984-10-18 Fr. Xaver Bayer Isolierglasfabrik Kg, 7807 Elzach METHOD AND DEVICE FOR BENDING SPACER PROFILES FOR INSULATING GLASS PANELS
AT389662B (en) * 1985-02-25 1990-01-10 Lisec Peter Glastech Ind DEVICE FOR BUTT WELDING
AT401627B (en) * 1987-03-09 1996-10-25 Lisec Peter DEVICE FOR PRODUCING SPACER FRAME FOR INSULATING GLASS DISC
DE3740921A1 (en) * 1987-12-03 1989-06-15 Bayer Isolierglasfab Kg DEVICE FOR PRODUCING A BEND ON A HOLLOW RECTANGLE PROFILE
DE3807529A1 (en) † 1988-03-08 1989-09-21 Bayer Isolierglasfab Kg METHOD AND DEVICE FOR BENDING HOLLOW SPACER PROFILES

Also Published As

Publication number Publication date
DE4116521C2 (en) 1998-07-23
ES2051110T3 (en) 1994-06-01
ES2051110T5 (en) 2002-07-16
EP0459971A1 (en) 1991-12-04
NO179493B (en) 1996-07-08
NO911925D0 (en) 1991-05-16
DE59101137D1 (en) 1994-04-14
ATE102513T1 (en) 1994-03-15
NO179493C (en) 1996-10-16
JPH0768322A (en) 1995-03-14
NO911925L (en) 1991-11-22
DK0459971T3 (en) 1994-04-05
EP0459971B2 (en) 2001-12-12
DE4116521A1 (en) 1991-11-28

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