EP1412604B1 - Device for assembling insulating glass panes - Google Patents

Abstract

The invention relates to a device for assembling glass plates (45, 46) into insulating glass panes spaced from one another and glued to one another along their edges by a frame-shaped spacer (47). Said device comprises a first upright and substantially rectangular pressure plate (1); a vertical conveyer (44) arranged beneath the first pressure plate (1), the glass plates (45, 46) standing on said conveyer and being conveyed through the first pressure plate (1) supported in the device; a second, substantially rectangular pressure plate (2) parallel to the first pressure plate (1) and whose spacing can be modified, said second plate having means for suctioning a glass plate (46) and a device for partially bending the glass plate (46) it has suctioned, which extends along one of its two edges running from the bottom upward, wherein the pressure plates (1, 2) are connected by synchronously actuatable adjustment devices in order to modify their spacing in the vicinity of their four corners. According to the invention, one of the bottom adjustment devices and the upper adjustment device that lies on top of said bottom adjustment device can be also actuated separately from the other two adjustment devices.

Description

The invention relates to a device for assembling glass plates to insulating glass with the features specified in the preamble of claim 1. Such a device is from the EP 0 539 407 B1 known. In such a device, two glass plates are positioned opposite each other between a fixed press plate and a movable press plate, wherein the one glass plate of the approximately vertical, slightly inclined backwards fixed press plate and thereby stands on a horizontal conveyor, whereas the other glass plate at the fixed pressing plate parallel movable pressing plate adheres by suction. One of the two glass plates, usually applied to the fixed pressure plate glass plate, carries a frame-shaped spacer which adheres to the glass plate and is glued to the other glass plate during assembly of the insulating glass pane. To assemble the insulating glass pane, the movable pressure plate is approximated to the fixed pressure plate parallel to itself until adhering to the movable pressure plate Glass plate meets the spacer. The two press plates are approximated to each other to a predetermined distance, which is the desired thickness of the insulating glass to be formed.

The insulating glass pane may contain ambient air, but also a gas other than air, in particular a heavy gas such as argon. The EP 0 539 407 B1 discloses an advantageous possibility, during the assembly of the insulating glass to replace the air in the interior of the insulating glass completely or largely by a heavy gas. For this purpose, the movable press plate is provided at its one from top to bottom edge with a bending device which sucks on the glass plate and it bends back a little in the edge region, before being connected to the spacer on the opposite glass plate. It then remains after the closing of the movable press plate on the one from bottom to top extending edge of the semi-finished insulating glass still an open gap, which has a constant thickness in the side view, is wedge-shaped in plan view and has a corresponding decreasing thickness of the bend. In the lower part of this vertical gap heavy gas is introduced through a feed device in the interior of the insulating glass, which displaces the air from the interior progressively. Above the gas supply means is applied to the two glass plates or to the adjacent edges of the press plates on a cover which prevents free flow of the heavy gas from the insulating glass, so that the heavy gas in the insulating glass can rise and displace the air upwards. The level of heavy gas in the insulating glass pane can be monitored by sensors provided at regular intervals on the cover. If the insulating glass pane has reached a certain degree of heavy gas filling, the supply of heavy gas is interrupted and the bending of a glass plate is reversed, so that it bears against the spacer frame and closes the insulating glass pane. After pressing the insulating glass to final size, it can be conveyed out of the assembly device.

The known device works very satisfactorily in the main use cases. With long-sized insulating glass panes whose length is substantially greater than their height, however, it becomes more difficult with increasing length to displace the air from the portion of the insulating glass pane far away from the gas supply means, so that with increasing length of the insulating glass panes, a desired degree of filling becomes more difficult of more than 90% by volume or more than 95% by volume within the usual cycle time of an insulating glass production line of not more than about 20 seconds. This is especially true when the gas flow in the insulating glass is obstructed by built-in rungs.

The present invention has for its object to provide a way, as in an assembly device in the EP 0 539 407 B1 mentioned type with the features of the preamble of claim 1 in the simplest possible way higher Füllgrade can be achieved with a heavy gas in the usual cycle time of a lsolierglasfertigung line.

This object is achieved by a device having the features specified in claim 1. Advantageous developments of the invention are the subject of the dependent claims.

The assembly device according to the invention is characterized by the characterizing features of claim 1. This allows not only to move the movable press plate parallel to the fixed press plate, but also to tilt it a little. This should be done with the two adjusting devices, which are further away from the bending device of the movable press plate than the other two adjusting devices. That's it possible to be assembled to the insulating glass not only at the one edge at which the glass plate can be bent, but also at the opposite edge to keep something open, namely by the slight inclination of the two press plates to each other, so that in long-sized insulating glass panes produced by bending gap is provided on the one from top to bottom edge, while a formed by tilting of the press plate second gap can be formed on the opposite edge and in the intermediate portion of the curved glass plate is already glued to the frame from the spacer. Therefore, gas flowing in one edge of the insulating glass can displace the air from the insulating glass not only through the upper portion of the same edge, but also through the opposite gap, so that the heavy gas easily reaches the opposite portion of the insulating glass panel from the gas supply means. In this case, the gap produced by tilting is preferably kept narrower than the gap created by bending, because this is more favorable with regard to the heavy gas losses occurring. The gap created by the tilting should be at most 1 mm wide, a width of 0.5 mm to 1 mm is favorable. For the gap created by bending, on the other hand, a width of 2 mm to 3 mm has been proven. Despite the gas losses that occur due to the escape of heavy gas from the gap formed by tilting the movable press plate, the heavy gas can quickly rise in the interior of the insulating glass when it is filled at a higher throughput than it can escape, which, as has been shown , can be achieved easily. As a result, even with very long-sized insulating glass panes, high fill levels of more than 90% can be achieved within less than 20 seconds with economically justifiable gas losses. The gas losses occurring are more than overcompensated by the fact that the filling time and thus the productivity of the insulating glass production line is increased, with a particular advantage is that this can be achieved with a minimum effort for the modification of a conventional assembly device.

The means for bending the glass plate and for supplying heavy gas may be formed as shown in the EP 0 539 407 B1 which is expressly referred to for this purpose. Instead of bending one glass panel along the entire edge, it would also be possible to bend it only in the area of the lower corner and to introduce heavy gas there as well as to let out displaced air.

The adjusting means for varying the movable pressure plate at a distance from the fixed pressure plate may be pressure medium cylinders which engage close to the four corners of the pressure plates and connect the pressure plates together. However, particularly preferred are adjusting means which operate with a spindle, wherein in each case a spindle is arranged in the vicinity of a corner of the press plates and the spindles are fixed to the one press plate and stuck to the other press plate in a spindle nut provided there, either the spindles are rotatably fixed to the spindle nuts or the spindle nuts are fixed and the spindles are rotatably mounted. With low-backlash spindles, e.g. with ball screws, the movable pressure plate can be moved precisely. To synchronize the four spindles, they preferably have a common first drive, preferably by means of an endless toothed belt, which is driven by a motor, in particular by an electric servomotor, and is tensioned via toothed wheels, which in the case of rotatable spindle nuts are connected to these or in the case of rotatable spindles are connected to those.

The two adjusting devices which make it possible to incline the movable press plate can additionally be actuated individually. It could be, for example, short-stroke pressure cylinder, which cause a slight inclination taking advantage of a guide clearance of the movable press plate. Preferably, however, the adjusting devices provided anyway are used in order to also effect an inclination.

Spindles are provided for the first drive, which are in spindle nuts, which are driven by a toothed belt, then it is preferred, the two separately operable spindles on that side of the other press plate, which is remote from the gears of the first drive, rotationally fixed with another two To connect gears over which a second toothed belt is tensioned, which belongs to a second drive, with which only these two other two gears can be driven to tilt the movable pressure plate. This is done in that case in this case, the second toothed belt rotates the two respective spindles, so that they shift in the spindle nuts, which are resting during which by the first drive remains at rest. If, on the other hand, the first drive is actuated, the second drive should remain at rest, so that the spindles do not rotate when the spindle nuts are driven. For this purpose, it is preferable to pass the second toothed belt through a clamping device which can clamp as required and thereby block the second drive.

If, however, the gears of the first drive rotationally connected to the spindles and instead the spindle nuts mounted non-rotatably, then you can assign the two separately driven spindles on the outside of the gears of the first drive facing away from each press plate a spindle nut which rotationally with one another Gear is connected, via which then the second toothed belt is tensioned. The difference to the previously described embodiment is only that in one case, the first drive drives the spindle nuts, while in the other case drives the spindles.

Another way to tilt the movable press plate, is to drive the two spindles concerned by means of two additional electric servomotors, with which the two spindles individually, preferably synchronously, can be adjusted.

An advantage of the invention is that it can use components for the second drive, which have already found use for the first drive. This makes the inventive design of the assembly device very inexpensive. It is also possible to retrofit existing assembly devices according to the invention with little effort by their two spindles are extended by extension pieces, where you can attack a second drive.

The second toothed belt could be driven by an electric servomotor. It is simpler to drive it by means of a pressure medium cylinder, which has a continuous piston rod whose two ends are connected to the two ends of the second toothed belt. With a suitable reduction ratio of the pressure cylinder to the gear and the gear to the spindle so you can sensitively tilt the movable pressure plate a little, which is preferably done under the control of a Wegaufnehmers, which monitors the displacement movement of the piston rod.

At the time of the EP 0 539 407 B1 known device, the movable pressure plate is moved to two mutually parallel guide rails, which are provided on the base of the device. For this purpose, the movable press plate has on its underside matching sliders, with which it slides on the guide rails. The guide clearance, which is present, in the usual dimensions of a press plate and in view of the resulting distance of the two guide rails of typically 3 m sufficient to cause sufficient for the purposes of the invention inclined position of the movable press plate. To close the press, the press plate is first tilted, then moved until the movable glass plate meets the spacer, and only before the final compression of the insulating glass pane, the inclination of the movable press plate is reversed. Should the guide game be so low that a sufficient inclination not reachable is, can be addressed by the fact that one connects the sliders, with which the press plate slides on the guide rails, articulated with the movable press plate.

Figur 1

zeigt eine Vorrichtung zum Zusammenbauen von Isolierglasscheiben in einer Seitenansicht,

Figur 2

zeigt die Vorrichtung aus Figur 1 in einer Ansicht auf die Rückseite,

Figur 3

zeigt als Detail einen Querschnitt durch die Vorrichtung im Bereich einer der unteren Verstelleinrichtungen gemäß Schnittlinie A-A in Figur 2, jedoch mit einer Ausbildung der Verstelleinrichtung wie im Stand der Technik,

Figur 4

zeigt einen Schnitt wie in Figur 3 durch die erfindungsgemäß weitergebildete Vorrichtung,

Figur 5

zeigt eine teilweise Vorderansicht der Vorrichtung, und

Figur 6

zeigt schematisch einen Horizontalschnitt durch eine halbfertig zusammengebaute Isolierglasscheibe während des Zusammenbaus in der erfindungsgemäßen Vorrichtung gemäß den Figuren 1, 2, 4 und 5.

A preferred embodiment of the invention will be explained with reference to the accompanying drawings.

FIG. 1

shows a device for assembling insulating glass panes in a side view,

FIG. 2

shows the device FIG. 1 in a view on the back,

FIG. 3

shows in detail a cross section through the device in the region of one of the lower adjustment devices according to section line AA in Figure 2, but with an embodiment of the adjusting device as in the prior art,

FIG. 4

shows a cut as in FIG. 3 by the device further developed according to the invention,

FIG. 5

shows a partial front view of the device, and

FIG. 6

schematically shows a horizontal section through a semi-assembled insulating glass pane during assembly in the inventive device according to the FIGS. 1 . 2 . 4 and 5 ,

The assembly device has a fixed planar pressing plate 1 and a movable, flat pressing plate 2 opposite thereto, which stand in a position inclined about 6 ° backwards on a base 3. The fixed press plate 1 is supported on the back by two struts 4, which on the one hand on tabs 5, which are located in the upper region of the press plate 1, and On the other hand, hinged to tabs 6, which are located in the rear region of the base 3. In FIG. 2 are shown by the tabs 5, 6, only the upper tabs 5 and the struts 4 are not shown.

The two press plates 1 and 2 are connected to each other by four parallel spindles 7. For this purpose, at the bottom of the fixed press plate 1, two spindle holders 8, at the top of the fixed press plate 1 two spindle holders 9, at the bottom of the movable press plate 2 two spindle holders 10 and at the top of the movable press plate 2 two spindle mounts 11 attached. In a conventional assembling apparatus, the spindle 7 is as in FIG FIG. 3 shown rotated with its front end in a plate 12 which has a threaded bore for this purpose, and is fixed therein by means of a turned on the end 7a of the spindle 7 lock nut 13. The plate 12 is screwed tightly to the spindle holder 10. In a corresponding manner, the upper spindles 7 are fixed to the two upper spindle holders 11 of the movable press plate 2.

According to FIG. 3 The spindle 7 extends through a protective tube 14, which passes through the spindle holder 8 of the fixed press plate 1 and is secured thereto. A corresponding protective tube 14 is provided on the upper spindle holders 9 of the fixed press plate 1.

The upper spindles 7 are located with their projecting from the back of the fixed pressure plate 1 backward portion in another protective tube 27. The lower spindles 7 extend with its from the back of the fixed plate 1 projecting rearward portion in a protective housing 28, which is located on the base 3.

At the back of the spindle holder 8 is a mounting plate 15, with which the outer ring 16 of a ball bearing 17 is screwed tight. In the rotatable inner ring of the ball bearing 17, a spindle nut 18 is inserted, which rotationally fixed to a gear 19 connected, in particular screwed, over which an endless toothed belt 20 runs. In a corresponding manner, the two upper spindles 7 are mounted in the upper spindle holders 9 of the fixed press plate 1.

The timing belt 20 is like the FIG. 2 shows, over all four gears 19 and further provided on the back of the fixed press plate 1 gears 21, 22, 23 and 24 stretched, of which the gear 23 by means of an electric motor, in particular by means of a servomotor, driven. The required tension in the toothed belt 20 can be adjusted so that the gear 24 by means of a pressure medium cylinder 25 is displaced. By the driven toothed belt 20, the four spindles 7 are moved in the same direction synchronously and - depending on the direction of rotation - advanced or withdrawn by the protective tubes 14, without turning, so that the movable press plate 2 is moved away from the fixed press plate 1 and moved towards it , In this case, the movable press plate 2 slides on two guide rails 26, which are located on the base 3, and is supported by the four spindles 7. The movement of the movable press plate 2 is parallel to itself and parallel to the fixed press plate. 1

Notwithstanding the in FIG. 3 illustrated prior art is another arrangement of the front end of the spindle 7 on one of the lower spindle holders 10 and the overlying upper spindle holder 11 of the movable press plate 2 is provided in the apparatus according to the invention. The different attachment is in FIG. 4 illustrated by way of example for the lower spindle holder 10, but also applies in the same way for the overlying spindle holder 11. On the fixed press plate 1, the spindles 7 according to FIG. 4 stored as well as it is based on the FIG. 3 is described, so that in the FIG. 4 does not have to be repeated.

According to the invention, the front end 7a of the spindle 7 has been extended by an extension part 29 screwed onto the front end 7a. The extension part 29 consists of an internally threaded sleeve 30, which is rotated on the front end 7a of the spindle 7, and an extension 31 with an external thread. On this threaded extension 31, a threaded sleeve 32 is rotated until it stops, which surrounds the threaded sleeve 30. The threaded sleeve 32 is secured on the threaded extension 31 by a lock nut 13 and secured against rotation on a gear 33, via which a second toothed belt 34 runs. In addition, sitting on the threaded sleeve 32 of the inner ring of a ball bearing 35, the outer ring 36 is fixedly connected to the spindle holder 10 and thereby with the movable press plate 2. The upper spindle 7, which is arranged above the extended lower spindle 7, 29, is extended and supported in a corresponding manner as in FIG FIG. 4 shown, extended, lower spindle 7, 29th

As long as the second toothed belt 34 remains stationary, by driving the toothed belt 20, the movable pressure plate 2 is moved forward or backward parallel to itself. However, the toothed belt 20 remains immobile and instead of the second toothed belt 34 is driven, then it rotates the gear 33 and, because this is rotatably connected to the spindle 7, 29, and the spindle 7, 29, so that these in the spindle nut 18th is shifted while taking the movable press plate 2. However, this displacement takes place only on the two elongated spindles 7, 29, but not in the other two, not elongated spindles 7, which as in FIG. 3 are shown represented. In order to be able to drive the extended spindles 7, 29 independently of the unextended spindles 7, the two gears 33, as in FIG FIG. 5 shown, the second toothed belt 34 tensioned. The second toothed belt 34 is driven by a pressure medium cylinder 37, which has a continuous piston rod 38, whose two ends by means of fasteners 39 and 40 are attached to the two ends of the second toothed belt 34. The housing of the pressure medium cylinder 37 is fixed to frame parts 40 of the movable press plate 2 connected. By pressing the pressure medium cylinder 37 whose piston rod 38, depending on the direction in which the piston of the pressure medium cylinder 37 is acted upon, moves upward or downward and takes the second toothed belt 34 with it. Parallel to the pressure medium cylinder 37, a displacement sensor 41 is arranged, by means of which the displacement of the piston rod 38 is controlled. This is preferably a potentiometer-type displacement transducer in which a rod 42 connected to the piston rod 38 is displaceably mounted in the housing of the displacement transducer 41 and displaces an electrical potentiometer in accordance with its displacement.

In addition, a clamping device 43 is fixed to the movable press plate 2, through which the toothed belt 34 passes. With the help of this clamping device 43, the second toothed belt 34 can be blocked, as long as it is not moved by the pressure medium cylinder 37. This can prevent the spindle 7 from rotating when the toothed belt 20 is driven.

Instead of driving the two gears 33 by a built in the timing belt 34 pressure medium cylinder 37, you could also individually, preferably synchronously, drive by an additional electric servo motor.

The fixed press plate 1 is formed as an air cushion wall, that is, it consists of a plate in which a number of holes is distributed, which can be supplied by a blower compressed air. Below the fixed press plate is provided as a horizontal conveyor a row of rollers 44, whose axis is perpendicular to the press plate 1 and which are synchronously driven. Glass plates, which are to be assembled in the assembly device to an insulating glass, are supported on the roller line 44 and leaning against the fixed press plate 1 in the assembly device, wherein the emerging from the bores of the press plate 1 air between the press plate 1 and the glass sheet an air cushion on which slides the glass plate. This is well known to the person skilled in the art and therefore here not shown further. The movable press plate 2 is formed in a similar manner as the fixed press plate 1; it also has a number of holes distributed over its surface and communicating with a fan through which air can be drawn. Thereby, it is possible to suck a glass plate standing on the roller line 44 from the movable press plate 2 and then to remove it from the fixed press plate to make room for a subsequent glass plate, which positions the sucked by the movable press plate 2 glass plate opposite is to be able to assemble them into an insulating glass pane. This too is well known to the person skilled in the art and will not be described further here.

The movable press plate 2 is provided at that vertical edge, which is adjacent to the non-extended spindles, with a bending device, which makes it possible to bend the suctioned there glass plate in the direction of the fixed press plate 1 away. A design of the press plate, with which this is possible, is described in detail in the EP 0 539 407 B1 described, which is hereby incorporated by reference; the in the EP 0 539 407 B1 The disclosed construction of the bending device is suitable for the purposes of the present invention, so that this type of training has not been shown in the present drawings. This is how it is in the EP 0 539 407 B1 has been described, the insulating glass pane during assembly, wherein the two glass plates are glued together via a spacer frame, along one of its edges initially hold, namely where the one glass plate is bent by means of the bendable press plate 2, so that there is an access gap to Interior of the insulating glass remains. Through this gap, a gas other than air, in particular a heavy gas, can be introduced into the insulating glass pane. After completed gas exchange, the bend is canceled and the insulating glass completely closed.

An assembly device according to the invention allows, at the other vertical edge of the insulating glass pane to be assembled also leave a gap open, while the two glass plates 45 and 46 are already glued together over the spacer frame 47 along their horizontal edges except for the gaps on the vertical edges, as shown schematically but exaggeratedly in FIG FIG. 6 is shown. FIG. 6 shows a first glass sheet 45 which abuts the fixed press plate 1 and is not bent. With her, the spacer frame 47 is glued, which is coated on both sides with a bead 48 of an adhesive. The second glass plate 46, which is sucked by the movable press plate 2, is at its one, in FIG. 6 Left, edge bent by the formed on the movable press plate 2 bending device, to form a wedge-shaped in plan view first gap 49. By slightly tilting the movable press plate 2 has a second, in plan view wedge-shaped gap 50 has arisen at the opposite edge of the glass plate assembly. The facilitates in insulating glass panes, the length of which is substantially greater than their height, the gas exchange, because the entering through the gap 49 heavy gas to displace existing between the glass plates 46 and 45 air not only through an upper portion of the gap 49, but they can also displace through the opposite gap 50.

The assembly device according to the invention allows the following procedure:

A first glass plate 46 is conveyed into the assembling device, stopped there, positioned, sucked by the movable press plate 2 and lifted from the fixed press plate 1. A second glass plate 45, already bonded to the spacer frame 47, is then fed into the assembly apparatus and positioned opposite the glass plate 46 against the stationary press plate. Then, the bender of the movable press plate 2 is activated and the first glass sheet 46 is bent along its one vertical edge. Then, when the toothed belt 20 is stopped, the pressure medium cylinder 37 is actuated, and thereby the movable pressure plate 2 by utilizing between the movable pressure plate 2 and the guide rails 26th existing game a little bit skewed. In this case, the toothed belt 20 can be kept at rest by an electric servomotor provided for its drive. The order of these two operations can also be reversed. Then the toothed belt 34 is clamped by the clamping device 34 and approximated by driving the toothed belt 20, the movable press plate 2 of the fixed press plate 1 until the glass plate 46 strikes the 48 coated with adhesive spacer frame 47, whereby the interior of the insulating glass to be formed except for in plan view, wedge-shaped gaps 49 and 50 are closed. The inclination of the movable press plate 2 can be 45 and 46 depending on the length of the glass plates are dimensioned so that the gap 50 has a width which is preferably not more than 1 mm. In contrast, the opposite gap 49 produced by bending can be slightly wider, preferably 2 mm to 3 mm. In the lower region of the gap 49, a heavy gas is then introduced, in particular to the in the EP 0 539 407 B1 described way. The incoming heavy gas displaces the air mainly through the upper portion of the gap 49, partially through the opposite gap 50. If more heavy gas is introduced through the gap 49, as flows through the gap 50, the heavy gas rises in the insulating glass, which by sensors , which may be arranged along the gap 49, can be monitored. Report the sensors that the heavy gas has reached the top of the insulating glass, the filling process is terminated and the bending of the movable press plate 2 and thus the glass plate 46 reversed, so that the gap 49 closes. The movable press plate 2 is set by pressing the pressure medium cylinder 37 straight, the toothed belt 34 is clamped again by the clamping device 43 and then pressed by driving the toothed belt 20, the insulating glass pane between the two press plates 1 and 2 to its nominal size.

Despite the gas losses through the gap 50 occurring during the gas exchange, it has been found that long-sized insulating glass panes, even if the gas flow in them is hindered by built-in rungs, within the typical cycle time of an insulating glass production line of less than 20 seconds can be filled with fill levels of more than 90%. The gas losses occurring through the gap 50 are acceptable because it is the inventive development of an assembly device according to the EP 0 539 407 B1 makes it possible to fill long-sized insulating glass panes with heavy gas within a cycle time of less than 20 seconds with fill levels of more than 90%. In addition, the inventive modification of the known assembly device is extremely inexpensive.

Claims (19)

1. Device for assembling insulating glass panes from glass plates (45, 46) that are held at a distance, and are bonded one to the other along their edges, via a frame-like spacer (47), comprising
   a first upright, substantially rectangular pressing plate (1),
   a horizontal conveyor (44) arranged below the first pressing plate (1), on which the glass plates (45, 46) are placed in upright position and can be conveyed into the device, supported by the first pressing plate (1),
   a second substantially rectangular pressing plate (2), which is arranged in parallel to the first pressing plate (1) and at a variable distance to the latter and which is provided with means by which a glass plate (46) can be attached to it by suction and, along one of its two edges that extend from the bottom to the top, with a device for temporarily bending the glass plate (46) that has been attached to it by suction,
   the pressing plates (1, 2) being connected one with the other in the neighborhood of their four corners by adjusting means that serve to vary their spacing, and means being provided for synchronizing the adjusting means, characterized in that the device additionally comprises means through which those lower adjusting means and the upper adjusting means arranged above the latter, which are farther remote than the other two adjusting devices from the device for temporarily bending the glass plate (46) attached to the second pressing plate (2) by suction, can additionally be operated separately from the two other adjusting means.
2. The device as defined in Claim 1, characterized in that the adjusting means are pneumatic cylinders.
3. The device as defined in Claim 1, characterized in that each adjusting device comprises a spindle (7) as the adjusting element that connects the pressing plates (1, 2) one with the other, as well as a spindle nut (18) that coacts with the spindle (7).
4. The device as defined in any of the preceding claims, characterized in that the four adjusting means have a common first drive (19 to 25).
5. The device as defined in Claim 3 and Claim 4, characterized in that for forming the first drive the spindles (7) or the spindle nuts (18) are each non-torsionally connected with a gear (19) that meshes with an endless toothed belt (20) or a chain, the gears (19) being arranged either at the back of the first pressing plate or at the back of the second pressing plate.
6. The device as defined in any of the preceding claims, characterized in that said two adjusting means, which can be operated separately from the other adjusting means, each comprise a servomotor.
7. The device as defined in Claim 6, characterized in that the two servomotors are synchronized one with the other.
8. The device as defined in any of Claims 1 to 5, characterized in that said two adjusting means that can be operated separately one from the other have a common second drive (33, 34, 37 to 42).
9. The device as defined in any of Claims 4 to 8, characterized in that the first and the second drives can be operated and blocked individually.
10. The device as defined in Claim 5 in combination with any of Claims 6 to 9, wherein the gears (19) of the first drive are non-torsionally connected with the spindle nuts (18) characterized in that the two separately operable spindles (7, 29) are non-torsionally connected, on the side of the other pressing plate (2) that faces away from the gears (19) of the drive, with two further gears (33) that mesh with a second toothed belt (34) that belongs to the second drive.
11. The device as defined in Claim 5 in combination with any of Claims 6 to 9, wherein each of the four gears (19) belonging to the first drive is non-torsionally connected with one of the spindles (7), characterized in that a spindle nut is arranged on each of the two spindles (7, 29) that are to be driven separately, on the outside of the pressing plate (2) that faces away from the gears (19) of the first drive, which spindle nuts are each non-torsionally connected with a further gear, and that those two further gears mesh with a second toothed belt.
12. The device as defined in Claim 10 or Claim 11, characterized in that the second toothed belt (34) is driven via a pneumatic cylinder (37) that has a passing piston rod (38) the two ends of which are connected with the two ends of the second toothed belt (34).
13. The device as defined in Claim 12, characterized in that a position encoder (41) is associated with the pneumatic cylinder (37) for monitoring the displacing movement of the piston rod (38).
14. The device as defined in any of the preceding claims, characterized in that two parallel guide rails are provided on the base (3) on which the movable pressing plate (2) slides via suitable sliding blocks (51).
15. The device as defined in Claim 14, characterized in that the sliding blocks (51) are connected with the movable pressing plate (2) in articulated fashion.
16. The device as defined in any of the preceding claims, characterized in that a bending device, which serves to bend the glass plate (46) located on the respective pressing plate, is provided at that end of the stationary pressing plate (1) or - preferably - of the movable pressing plate (2) which is farther remote from the separately operable adjusting means, whereby that glass plate is bent away from the oppositely arranged pressing plate.
17. The device as defined in Claim 16, characterized in that means for supplying a gas different from air are provided at the same side on the assembly device, especially in the lower region of the pressing plates (1, 2).
18. The device as defined in Claim 16 or Claim 17, characterized in that the means for bending the pressing plate (46) are configured in the way disclosed in EP 0 539 407 B1.
19. The device as defined in any of Claims 16 to 18, characterized in that the means for supplying a gas different from air are configured in the way disclosed in EP 0 539 407 B1.

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