Patent Application
20070068616
The invention assumes a method with the features specified in the preamble of claim 1 and a device with the features specified in the preamble of the claim 7. Such a method and such a device are known from the EP 0 539 407 B1.
The EP 0 539 407 B1 reveals a press, in which glass sheets are assembled and pressed to a specified thickness between a fixed pressing plate and a plate parallel to this, whose distance can be adjusted, to make insulation glass panes.
In the known press, both the pressing plates are not exactly vertical, but instead are inclined by a few degrees. In the press, two glass sheets, from which an insulation glass pane is to be made, are positioned lying opposite to each other. One of the glass sheets is equipped with a frame-like spacer and lies at the pressing plate inclined backward, while it stands on a horizontal conveyor. The other glass sheet is held opposite to this at the other, movable pressing plate, especially by the mechanism of sucking it to the movable pressing plate. When the movable pressing plate approaches the fixed one, this glass sheet gets stuck to the spacer holding the glass sheet lying opposite, as a result of which the insulation glass pane is closed.
Before the insulating glass pane is completely closed, it can be filled in the press with a heavy gas. For this purpose a section of the movable press plate, which lies backward at one of the protruding margins of the pressing plate, that is, away from the opposite pressing plate, can be bent. The sucked glass sheet is thereby also bent backward. If the movable pressing plate is now brought near the fixed pressing plate in this state, then the insulating glass pane is closed except in the area, in which one of the glass sheets is bent backward. In the almost completely closed insulating glass pane, heavy gas can be introduced through the gap between the bent glass sheet and the spacer, which displaces air from the insulating glass pane. Thereafter the insulating glass pane is closed completely by cancelling the bend in the pressing plate and in the glass sheet attached to it.
Presses, in which the insulating glass panes can be assembled and filled with gas, frequently have a length of 3.5 m. However, it is possible that the insulating glass panes are longer than the pressing plates. Insulating glass panes with a length of up to 5 m are frequent. They can be assembled and filled with gas in the presses known from the EP 0 539 407 B1. To do this, one positions the glass sheets in the press in such a way that they close flush with that margin of the movable press plate, at which the section bent backward is provided. At the opposite end of the press plates the glass sheets then protrude beyond this. Too long glass sheets can, therefore, be assembled and filled with gas in the known press, because when the movable press plate approaches the fixed press plate, even the protruding section of the insulating glass pane is closed and the heavy gas can be filled, as usual, at the opposite bent end.
In case of especially long insulating glass panes, however, it is difficult to displace the air from the far-reaching areas at the other end of the insulating glass pane with the heavy gas, which is introduced at the bent end of the insulating glass pane. Presses, in which the insulating glass pane is filled with heavy gas at the lower end, avoid this disadvantage. For instance, such a press is known from the EP 0 674 086 B1 and from the EP 0 674 087 B1. In it, the glass sheets being assembled to make insulating glass panes can also be placed parallel and unconnected to each other. The heavy gas is introduced via the openings in a conveyor belt, on which the glass sheets are present, as long as the glass sheets are still completely unconnected. To ensure that the heavy gas does not flow out of the area between the glass sheets, adjustable sealing elements, running, from bottom to top, are provided, which become effective at the protruding ends of the glass sheets. In the area thus formed between the glass sheets and the sealing elements, the heavy gas now rises from bottom to top and displaces the lighter air to the top.
Alternatively, the glass sheets, of which one is carrying a spacer, can also be arranged in such a way in the presses known from the EP 0 674 086 B1 and the EP 0 674 087 B1, that the other glass sheet with its upper margin also lies against the spacer, so that the glass sheets diverge away from each other in a wedge-shaped manner from top to bottom. Even in this case, the area between the glass sheets is filled with heavy gas from below, which displaces the air above through a free area between the sealing elements and the protruding margins of the glass sheets or between the sealing element and the protruding side piece of the spacer.
If the heavy gas has risen till the upper margin of the glass sheets, the movable press plate is brought closer to the stationary press plate and thereby the insulating glass pane is closed and pressed.
In such a press excessively long insulating glass panes can be assembled, but cannot be filled with a heavy gas, because the section of the still unconnected glass sheets, protruding out of the press, would still be open, from which the heavy gas would flow out unrestricted.
It is the object of the present invention to show a way, how in a press with two parallel, vertical or inclined pressing plates, which is designed for filling the area between the glass sheets with a heavy gas from below, excessively long insulating glass panes can be filled with a heavy gas.
This object is accomplished by a method with the features specified in claim 1 and by a device with the features specified in claim 7. Advantageous developments of the invention are the subject of the subclaims.
According to the invention, it is intended to seal the section of the glass sheets protruding out of the area between the plates making up the press in such a way that one already connects both the glass sheets in this section by means of a frame-like spacer, for which one bends the glass sheet, which at first does not have the spacer, out of its plane towards the other glass sheet and, if needed, brings it closer through parallel displacement to such an extent that the sections of the glass sheets protruding from the area between the plates get firmly stuck to each other, whereas in the space between the plates the glass sheet, which initially is free from the spacer, still maintains a distance to the spacer, which can be 2 mm to 3 mm. This distance is ensured by the fact that the bent glass sheet is held firmly at that plate further inside in the space between both the plates, against which it is lying with its rear side, especially by the fact that it—as already known—is sucked to the plate through the openings present in the plate.
In this position now, heavy gas can be filled in the space between the glass sheets from below. Flowing out of the heavy gases from below is prevented by a horizontal conveyor, which, for this purpose, is best designed as rope-belt conveyor. At the margin of the plates, at which the glass sheets are still unconnected, the chamber to be filled with heavy gas is sealed with the first sealing device. At the opposite ends of the plates, already closed sections of the insulating glass pane are present. If the insulating glass pane is rectangular, it can be filled with the heavy gas from below till its upper margin, without that a protruding sealing device would be necessary at this end of the plates. In case of insulating glass panes, which have a rectangular outline, the so-called model plates, however, in most of the cases a supplementary sealing through a second sealing device is necessary, in which case it is preferably a sealing element that can be moved from top to bottom, which becomes effective near the upwardly extending margin of the plates, where the protruding sections of the glass sheets are positioned. The second sealing device is moved down till the upper margin of the glass sheet arrangement, better, till the upper side of the spacer, in order to prevent that the rising heavy gas flows sideways. Another sealing device is recommended at a location below the second sealing device, in order to close the gap between the horizontal conveyor and the insulating glass pane, through which otherwise—despite closing the section protruding beyond the plates—a part of the heavy gas could flow out.
The device according to the invention has the first sealing device upwardly extending from the horizontal conveyor in the area of a protruding margin of the plates and a second sealing device in the area of the opposite margin of the plates, which can preferably be displaced from top to bottom. It can be arranged between the plates and in this state can be introduced in the space between the plates from top to bottom along the surface of the plates facing each other and can be compressed reversibly by reducing the mutual distance of the plates. However, it can also be arranged outside the plates near their margins, where it can purposefully be displaced in the guides.
Such a second sealing device has distinct advantages, when long glass sheets are to be processed:
The second sealing device is preferably designed in such a way that it can be bent against a restoring force from a straight shape which it assumes, in the relaxed state, and can be reset again in the straight shape by the restoring force. This means that the second sealing device, when it is pushed down from the top, assumes and retains a straight shape on its own. This further means that the sealing device, if one lets it hang freely from the top or else move it down over a plate inclined backward, strives for a straight shape and also normally achieves it. This helps in creating well-defined relationships between the plates. Such a second sealing device is suitable to be lowered in the gap between both the plates till the horizontal conveyor, hanging freely and still linear and free of obstructions without any special guide. Another advantage is that the second sealing device can be deflected above the plates and can be lowered along the outer side of the plate, preferably under loop formation, or else can also be wound in a space-saving way.
There are different design options for the second sealing device. One possibility is to use a spring strip being V-shaped or a Z-shaped in the cross-section, which attaches itself to any of the two plates with a side piece, gets compressed when the mutual distance between the plates is reduced and thereby brings about a sealing from the level of the horizontal conveyor till the upper margin of the plates. Such V- and Z-shaped spring strips can be bent and wound easily.
In a first embodiment the second sealing device has a strand that can be compressed reversibly, which is connected with a flat spring strips on one side, which contacts flatly the one or the other plate, whereby the reversibly compressible strand gets compressed when the distance between the plates is reduced and thus brings about a sealing.
In another embodiment of the invention the second sealing device shows a reversibly compressible strand, which is connected to a spring strip on each of its opposite sides, which lie flatly against both the plates when the distance between them is reduced and thus bring about a sealing.
In another embodiment the second sealing device shows a reversibly compressible strand, in which at least one spring strip is embedded, especially centrally. This favors a deflection and a bending of the sealing device.
In another embodiment of the invention the second sealing device shows a steel tape, which is connected to a reversibly compressible strand on both of its sides, which omits edge stripes of the spring strip. Even in this embodiment the sealing device can be bent easily. Another advantage is that the spring strip can be guided at its edge stripes.
The reversibly compressible strand comprises preferably of foam plastic or of foam rubber. Such a design is economical, seals effectively, is reliable and has a long life.
Another possibility of forming a reversibly compressible strand is to make it from an elastomer hollow profile, e.g. from a profile rectangular in its cross-section. Such profiles can be produced economically by extrusion and are available in the market. They also have the advantage that they can also be wound easily, even in conjunction with a spring strip. The compression of the hollow profile can be simplified by predetermined fold lines that run longitudinally, which are provided in the walls of the hollow profile running transverse to both the plates of the device. Such predetermined fold lines simplify a controlled compression of the hollow profile, especially when the walls, in which the predetermined fold lines are provided, are folded slightly inward from the beginning itself.
Spring strips protruding beyond the reversibly compressible strand on both the sides simplify the guiding of the second sealing device. At the lower end, the reversibly compressible strand is preferably protrudes over the spring strips, so that the second sealing device can be placed on the margin of the glass sheets tightly and also in a saving manner or—in case of shorter glass sheets—hit the horizontal conveyor. The horizontal conveyor preferably shows an endless, driven conveyor belt, which not only conveys and carries the glass sheets in the device, but also seals on the lower side the chamber, in which the gas is introduced. Such a conveyor belt has been revealed, for instance, in the EP 1 450 001 A1. It can not only attach itself to the lower ends of the glass sheets, but can also be applied to the lower edges of both the plates.
To store the second sealing device in its ineffective position, so as to save space, a deflection device is provided at the upper edge of one of the plates, with the aid of which the second sealing device is deflected in a different direction from the vertical or from an almost vertical direction, when it is pulled out of the space between both the plates. In the simplest case, the deflection device is a roller, which has an axis of rotation parallel to the direction of conveying. One can let the second section of the sealing device pulled out of the space between the plates hang freely on the outside of the concerned plate. However, it is preferred to provide a special storage device for the section of the second sealing device taken out, especially a shaft running from top to bottom, in which the second sealing device is introduced, or a guiding profile running from top to bottom, which partly encompasses the second sealing device. One can also push the second sealing device in such a guiding profile, so that it has a defined position and does not collide anywhere. A shaft and such a guide profile can also be used combined with each other.
Another possibility is to fix the upper end of the second sealing device in the height of the deflection roller, but at a little distance from it, and to let it hang in loop-shape between the deflection roller at the location, at which the sealing device is fixed.
In another development of the invention a coiling device is intended for storage. It can also be used instead of the deflection roller mentioned above.
Pairs of drive gears, drive rollers or drive belts are suitable for driving the second sealing device, which act on the opposite sides of the second sealing device, especially at the protruding edge stripes of a spring strip, which is connected preferably—as already described above—with a reversibly compressible strand especially through adhesion or through vulcanization.
The pairs of drive gears, drive rollers or drive belts are purposefully arranged at or near the deflection device or the storage device. Here, guiding devices are also placed preferably, which also help in determining the bend, by which the second sealing device is deflected.
In a device for assembling the insulating glass panes, one of the two plates is mostly fixed. It requires the least effort to place the second sealing device and its deflection device at the fixed plate.
There are devices for assembling the insulating glass panes, in which both the opposite plates can be deviated from a position, in which they lie opposite to each other in a V-position, to a position, in which both of them are vertical and lie parallel to each other. Such a device has been disclosed in the EP 0 615 044 A1. However, in most of the devices for assembling the insulating glass panes, the two plates are parallel and not exactly vertical, but instead arranged at an inclination of about 6°, so that the glass sheets can be conveyed while they are leaning on a plate inclined backward. In such a device, the second sealing device is placed preferably at the plate inclined backward; this is the plate, whose inner side points inclined upwardly. The inner side of a plate here is the side, which is facing the plate lying opposite to it. Accordingly, the outer side of the plate is the side, which is facing away from the plate lying opposite to it.
If the second sealing device is arranged on the plate, whose inner side points inclined upward, then the advantage is that it is supported and guided easily by this plate. But it is also possible to arrange the second sealing device at the plate, whose inner side points downward.
The same or the corresponding parts are identified in the embodiments with the same reference numbers.
FIGS. 1 to 5 show a device for assembling insulating glass panes with a stand 10, on which the first flat plate 1 is arranged fixed, and in a position inclined backward by a few degrees e.g. by 6°. The first plate 1 is held and strengthened on the back side by a framework type frame 11, which stands on a horizontally extending beam 13, which supports itself directly on the stand 10. On the back side, the frame 11 is also supported by struts 15 at the stand 10.
The first plate 1 lies parallel to and approximately coincides with a second plate 2 on the opposite side, which is held and strengthened on its outer side by a framework-like frame 12, at whose lower end a horizontally extending beam 14 is placed, which supports itself directly on the stand 10. Both the beams 13 and 14 are parallel to each other. The frame 12 of the second plate 2 is connected with the frame 11 of the first plate 1 by means of four spindles 16. The spindles 16 extend at a right-angle to the plates 1 and 2 and can be rotated in bearing blocks 17, which are fixed on the upper edge of the frame 12, and in bearing blocks 18, which are fixed at the lower side of the beam 14; however, they cannot be pushed in the bearing blocks 17 and 18. The lower bearing blocks 18 are placed sliding on rails 19, which are placed at a right-angle to the plates 1 and 2 on the stand 10.
At the upper edge of the frame 11 of the first plate 1, two casings 20 are provided opposite to the bearing blocks 17 and at the lower edge of the beam 13 two casings 21 are provided, which lie opposite to the bearing blocks 18 and are connected on one hand with the beam 13 and on the other with the stand 10. The casings 20 and 21 contain spindle nuts not shown here, which can be driven synchronously, as a result of which the second plate 2 can be displaced parallel to itself and its distance to the first plate 1 can be changed.
At the beam 13 below the first plate 1 a horizontal conveyor 3 is arranged parallel to the beam 13, which is divided in two consecutive sections 3a, 3b, see
At the upper edge of the frame 11 of the fixed plate 1, a third sealing device 7 and a fourth sealing device 8 are placed. The second, third and fourth sealing devices 6, 7, 8 are a flexible, reversibly compressible strand 33 with a rectangular cross-section, which is covered with a spring strip 34 on one side, which protrudes over the strand 33 on both the sides. The strand 33 can be made of foam rubber or foam plastic. Alternatively the strand 33 can also be a hollow profile of an elastomer e.g. a box profile. The spring strip 34 is preferably a thin spring sheet made from spring steel having a thickness of 0.2 mm to 0.3 mm, to which the strand 33 is stuck or vulcanized. The spring strip 34 should not develop any restoring force when in a straight position, so that it aligns the second, third and the fourth sealing devices 6, 7, 8 in a straight shape, when these are hanged.
At the upper edge of the fixed plate 1 and its frame 11, a rail 35, extending between the casings 20 and parallel to the conveying direction 4 is placed, on which the third and the fourth sealing devices 7 and 8 as well as two carriers 36 can be moved, of which each carries a roller as a deflection device 37 and a driving device for the respective sealing device 7, 8. The driving device is described in more detail in the German Patent Application 10 2005 033 040.1.
The second sealing device 6 essentially has the same structure as the third and the fourth device 7, 8, but contrary to these cannot be moved parallel to the conveying direction 4, but instead is placed stationary at the left margin of the first plate 1.
At the inlet side of the device there is provided at the stand 10 a fifth sealing device 9, which is shown in detail in
Given below is a description of how one should proceed according to the invention, when the device shown in the FIGS. 1 to 5 is to assemble an insulating glass pane and is to be filled with a heavy gas, which shows an over-length, so that it protrudes beyond the press formed with the two plates 1 and 2.
Initially, all the sealing elements 5 to 9 are present in their ineffective position. The first glass sheet 31, standing on the conveyor belt 22 and leaning against the first plate 1 is conveyed in the direction 4 into the space between both the plates 1 and 2. In order that the first glass sheet 31 slides smoothly over the inner side 1a of the first plate 1, it is provided with numerous small openings, not shown here, through which air can be blown by means of a blower, which generates an air cushion between the glass sheet 31 and the inner side 1a of the plate 1. The first glass sheet 31 is conveyed till a given end position near the edge of the plate 2 lying in the front in the conveying direction 4. If the first glass sheet 31 has reached there, the horizontal conveyor 3 is stopped. The second plate 2, in which sucking devices, not shown here, are integrated, is moved against the first glass sheet 31 by activating the spindles 16, sucks it and is then removed again from the first plate 1. After this a second glass sheet 32, to which a frame-shaped spacer 30 is sticking, is moved in a position standing on the horizontal conveyor 3, in which it lies coinciding opposite to the first glass sheet 31. A rear section of the glass sheets 31, 32 protrudes out of the press formed by the plates 1 and 2.
If both the glass sheets 31, 32 are positioned opposite to each other in a coinciding way, the second sealing device 6 is pushed down from the top, till it meets the upper edge of the glass sheets 31 and 32 and preferably also till the upper side of the spacer. The strand 33 made of soft, compressible foam rubber protrudes over the front end of the spring strip 34. This enables the strand 33 to penetrate in the space between both the glass sheets 31, 32 till the spacer 30 and to apply to this, which can be supported by an inclined cut end, as shown in
In the next step, several pressurizing cylinders 42 are activated, which are placed on the inlet side of the device one upon the other on the frame 12, which supports the second plate 2. The pressurizing cylinders 42 have a piston rod 43, which is hinged at the rear side of the second plate 2. By activating the pressurizing cylinders 42, the second plate 2 can be slightly moved forward at its inlet-side margin, e. g. by 2 mm to 3 mm, by bending the plate 2, as shown exaggerated in
By pushing forward the inlet-side edge of the movable plate 2, the first glass sheet 31, which is adhering to the second plate 2, also gets bent, so that its section protruding out of the space between both the plates 1 and 2 gets connected to the similarly protruding section of the spacer 30. The consequence is that the section of the glass sheet arrangement protruding out of the space between both the plates 1 and 2 is closed with both the glass sheets 31 and 32 by adhering to the protruding section of the spacer 30, whereas in the space between both the plates 1 and 2 the first glass sheet 31 is still at some distance from the spacer 30, because it is adhering to the second plate 2, because it is sucked to this. This state is shown in
Thereafter, the fifth sealing device 9 is swiveled in its effective position, see
Into the chamber a gas other than air is introduced preferably from below e.g. in the way described in the EP 1 450 001 A1, especially a heavy gas, which rises in the chamber and thereby fills the space between the glass sheets 31 and 32.
Thereafter, the movable plate 2 is removed again from the fixed plate 1, the first sealing device 5 is drawn back in its ineffective position, the second sealing device 6 is drawn up in an ineffective position, the fifth sealing device 9 is swiveled down in its ineffective position and the assembled insulating glass pane is conveyed out from the device by driving forward the horizontal conveyor 3. During all this, another first glass sheet for the next insulating glass pane can be conveyed into the device.
Of course, the invention is not only suitable for triangular insulating glass panes, but also for insulating glass panes with any outline form, especially for rectangular insulating glass panes.
The third and the fourth sealing devices 7 and 8 remain in an ineffective position during the assembly and the gas-filling of over-long insulating glass panes. They are used when shorter insulating glass panes are assembled and filled with gas, whose length is less or much less that the distance of the first sealing device 5 to the second sealing device 6. To this extent, a reference is made to the disclosure in the German Patent Application 10 2005 033 040.1.
The embodiment shown in the
List of Reference Numbers:
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2005 044 861.5 | Sep 2005 | DE | national |
