EP1344604B1 - Method and apparatus for bevelling pieces of cut glass - Google Patents

Abstract

At least one machining tool is equipped with a pair of belt grinders (10,12) with grinding belts (26). The runs of the belts acting upon the glass panes (3) extend in planes which with the plane of the glass pane includes an acute angle and cross one another in the region of the pane's edge. At least one and preferably both belt grinders can be pivoted by an actuator (32,34) into a working position in which their belts are located at the edge of the pane.

Description

The invention relates to a method with the features of Preliminary part of claim 1. The invention relates furthermore, a device with which the method is carried out can be.

Glass panels are cracked and cracked to the desired Size tailored, which is usually on so-called "glass cutting tables" and these associated "Brecht tables" takes place.

The glass blanks thus obtained have very sharp-edged, Burrs having edges, what for the subsequent handling the glass blanks, for example in the manufacture of insulating glass panes, is disadvantageous. On the one hand there is the danger that the edges of the glass blanks break out and on the other hand there is a considerable risk that someone will at the sharp edges of the glass blanks by cutting injured. Also subject to the edges of the glass blanks engaging support and transport means (e.g. or conveyor belts) through unprocessed edges of glass blanks a heavy wear.

From DE 44 19 963 C is a method with the features of Preliminary part of claim 1 or 8 known. The editing tool DE 44 19 963 C is stationary and it becomes single the glass blank to be processed relative to the machining tool emotional.

The invention is based on the object, a method and a device for trimming the edges of glass blanks to make available with which cut glass so processed can be that their edges are no longer sharp-edged are, in particular, have no burrs.

This task is solved in terms of the method, in the first place Line with the features of the independent main claim of the method, and as far as the device is concerned, first and foremost with the features of the independent device main claim.

Preferred and advantageous embodiments of the invention Method and apparatus of the invention are Subject of the dependent claims.

As used in the inventive method for trimming Machining tool on both edges of a border of a glass blank simultaneously attacks, is opposite a way of working that involves only one edge of a border edited, so trimmed and deburred, not just working time Saved, but it is also achieved that on the glass cut no significant forces acting across its plane, so that holding the glass blank or the controlled movement of the same when trimmed with simple ones Means is possible. Also, short cycle times are achieved.

In the method according to the invention, all are successively (four) edges of a glass blank trimmed on both sides.

The inventive method provides that worked in this way will that first with the trimming of the edges of the lower, horizontal edge of the glass blank is started and then the edges of the front, vertical edge in the direction of movement, then that of the upper, horizontal edge, then that of the in Movement direction rear, vertical edge are trimmed.

The method according to the invention is used during processing the edges of the glass blanks vertically or substantially executed vertically aligned glass blanks. The Working with vertically aligned glass blanks has the Advantage that the inventive method and the hie door provided device easily in plants for manufacturing of insulating glass panes, which are almost exclusively with vertically aligned glass blanks or insulating glass panes work, can be integrated. It is then namely no longer necessary, the glass blanks, their edges after the method according to the invention or in the inventive Trimming device are to tip over in a horizontal position if they are made from glass blanks stores (e.g.

Compartment trolley) are removed to according to the invention Process or processed in the device according to the invention to become. Also, the trimmed glass blanks then need no longer in the vertical or substantially vertical Able to be aligned, for example, if one Glass panel washing machine to be supplied.

A suitable for carrying out the method according to the invention Device works with a machining tool that has crosswise arranged belt sander, which at both Edges of one edge attack simultaneously to the edges of the To break edges of glass blanks, so to trim, around remove sharp burrs.

Since the device according to the invention a single machining tool with a pair of belt grinders The four edges of the glass blanks are processed one after the other.

In the device according to the invention is an adjustable mounted one perpendicular to the plane of the glass blank Axis pivoting machining tool with a pair of provided mutually crossing belt grinders, one after the other worked all four edges of the glass blank.

As the adjustably mounted machining tool in addition can be pivoted about an axis perpendicular to the glass plane, can It also for editing the edges at the top horizontal edge the glass blank are used by the glass blank is moved under him.

The conveying device, which in the device according to the invention Glass blanks opposite the machining tool moved, is preferably divided into several sections, wherein Each conveyor unit consists of an endless conveyor on which the Glass blanks with their lower edge stand up, and two, in the Area of the lower, horizontal edge from both sides the glass blanks attacking, endless conveyor links consists. The glass surfaces attacking, opposite each other endless conveyor links can be a good one To achieve frictional engagement with the glass blanks, with pressure jaws be equipped.

Additionally or alternatively, for the safe transport and properly positioning the glass blanks in the device and for the safe transport of the glass blank, while being handled by trimming, a driving device be provided, which acts on the glass blank. For example, this driving device is one with negative pressure acted upon device, such as a vacuum suction, which is driven in the direction of movement in the device, is displaceable.

Further details and features and advantages of the invention Method and apparatus of the invention will be apparent from the following description of embodiments the invention.

Fig. 1 in Seitenansicht schematisch eine Vorrichtung zum Besäumen von Glaszuschnitten,

Fig. 2 in Schrägansicht ein Bearbeitungswerkzeug,

Fig. 3 eine Draufsicht auf das Bearbeitungswerkzeug von Fig. 2, und

Fig. 4 in Schrägansicht ein Ausführungsbeispiel für eine am unteren Rand eines zu besäumenden Glaszuschnittes angreifenden Transporteinheit.

It shows:

1 is a side view schematically a device for trimming glass blanks,

2 is an oblique view of a machining tool,

Fig. 3 is a plan view of the machining tool of Fig. 2, and

4 shows an oblique view of an exemplary embodiment of a transport unit acting on the lower edge of a glass blank to be trimmed.

The embodiment of the device shown in Fig. 1 has a frame 1, on which a support wall 2 for a to be machined Glass cut 3 is mounted. The support wall 2 is in Embodiment to the vertical inclined backwards, so that a glass blank 3 are transported leaning against her can. For transporting the glass blanks 3 and for supporting the same from below is in the area of the lower edge the support wall 2 a number of conveyor rollers 4 or a similar Conveying device, e.g. a subdivided if necessary Conveyor belt, provided. On the support wall 2 of the glass blank 3 guided by a plurality of freely rotatable support rollers 5, wherein a series of support rollers 6 between the conveyor rollers. 4 and the lower edge of the support wall 2 is provided. So is the glass blank 3 safe especially at its lower edge guided. In place of the support wall 2 described can also be Roll or roll field or an air cushion wall provided be to support glass blanks 3 sideways.

At an arbitrary point at the bottom of the retaining wall 2 is a machining tool with a pair of belt sanders 10 and 12 are provided. The belt grinders 10 and 12 are in the machine frame 1 to behind the support wall 2 lying Axles 14 and 16 pivotally mounted (arrows 18 and 20). Each belt sander 10, 12 has two pulleys 22 and 24th for an endless sanding belt 26. Between the dreams of the Abrasive belt 26 is a pressure medium cylinder 30 is received, which is pivotally supported on the bearings 14 and 16 and which carries the guide roller 22, so that the abrasive belts 26th be tensioned by applying the pressure medium cylinder 30 can.

For pivoting the pressure medium cylinder 30 and thus the Belt sander 10 and 12 to take them from a standby position in their operative position in which their abrasive belts 26 at the bottom horizontal Edge of the glass blank 3, so the edge on the conveyor rollers 4 gets up, attack, each of the pressure medium cylinder 30 a supported in the machine frame 1 actuating cylinder 32 and 34 assigned. This actuating cylinder FIGS. 32 and 34 are in the embodiment shown in FIG on an arm 36 which is fixed in the machine frame 1 is, supported and shown only schematically. It can be seen from Fig. 1 that the abrasive belts 26 in their Wirklage are aligned so that their on the lower edge the glass blank 3 acting dreams together Include angles of about 90 °, so cross each other.

One of the deflection rollers 22, 24, preferably the deflection rollers 24 in the area of bearings 14 and 16 in the machine frame 1, a not shown drive motor is assigned to the Abrasive belts 26 when using the device for trimming the edges of edges of glass blanks 3 to remove from them Remove burrs, drive. Thereby the sanding belts become 26 preferably driven to be in the area in which they attack at the bottom of the glass blank 3, in opposite directions run, especially in the illustration of Fig. 1 in its crossing point, in which the edge of the glass blank 3 to be processed is received, each other to run.

In the apparatus, a driving device for the zu processing glass blank 3 may be provided. This driving device is a sucker in the simplest embodiment, which can be subjected to negative pressure and thereby that from the operating side of the device (on the right in FIG. 1) facing away, ie the rear surface of the glass blank to be processed 3 applies. The sucker of the driving device is in Machine frame 1 slid so that he the glass blank 3 not only can take, so the transport of the glass blank 3 by the conveyor rollers 4, at the bottom of the Attacking glass blank 3 and getting it up, supported, but also by stopping the drive means holds the glass blank 3 stationary for the vacuum cleaner when This, for example, when editing the edges of the vertical Edges of the glass blank 3 is needed.

The machining tool with its pair of belt sanders 10, 12 can be vertical edges of a glass blank to be processed 3 to be trimmed. That's what it's for the arranged on a carriage machining tool with the belt grinders 10, 12 about a perpendicular to the plane of Support wall 2 and thus perpendicular to the plane of the glass blank 3 aligned axis pivoted. The editing tool with the belt grinders 10, 12 can also be aligned so that the belt sander 10, 12 the upper horizontal Edge of the glass blank can work while the glass blank 3 is moved under him.

To the wear of the abrasive belts 26 of the belt grinder 10, 12th balance the pressure with which the belt sander 10, 12 applied to the edge of the glass blank 3 to be machined will be increased. Alternatively or additionally, the Circulating speed of the grinding belts 26 can be increased. Of Further, if appropriate in addition to one or both aforementioned measures, the relative speed between the belt grinders 10, 12 and the glass blank 3 be reduced to the wear of the abrasive belts 26th compensate.

In any case, nozzle arrangements (95, Figs. 3, 4) may be provided be, from which a trimming supporting liquid on the sanding belts 26 and / or the just processed Edge of a glass blank 3 can be injected.

The device for trimming edges on the edges of Glass blanks 3 may have a housing 60 in the bottom a subdivided into four transport units conveyor 62 is provided.

The machining tool shown in Figs. 2 and 3 with two Crossing belt grinders 10 and 12 is at one vertical guide rail perpendicular to the passage direction of Glass blanks 3 moved up and down.

Details of the design of the up and down adjustable Machining tool are shown in Figs. 2 and 3. There It can be seen that the sanding belts 26 of the belt grinder 10, 12 each associated with a drive motor 16, 14, with one of the guide rollers 24 coupled to the abrasive belts 26 is.

To guide the machining tool along the glass blanks 3 can be applied to the glass blanks 3 rollers 75th provided, which rotate freely about horizontal axes on supports 76 are held, in turn, by pressure medium cylinders 77th can be operated.

When the machining tool is in its ready position, that is, below that formed by the transport units Conveyor 62 is located, the glass blanks. 3 of freely rotating about vertical axes support rollers 78 on the one side and on the other side of an endless guide band 79, the two rotatable about vertical axes rollers 80 is laid, led.

In Fig. 2 it is also shown that the Sschleifbänder 26 in the Area where they work on the vertical edges of the Engage glass blanks 3 from inside through back up rollers 81 are supported, so that the required contact pressure also without undue tensioning of the abrasive belts 26 by means of Pressure medium cylinder 30, which engage the pulleys 24, can be applied.

In Figs. 2 and 3, the nozzle assemblies 95 can be seen, with which at the points where the sanding belts 26 to the Attack edges of the glass blanks 3, supporting the trimming (Rinse) liquid can be supplied. Prefers For example, the nozzles of the nozzle assemblies 95 are aligned so that the (rinse) liquid is approximately parallel to the at the respective Nozzle assembly 95 passing strand of abrasive belts 26 and in the direction of the movement of the same from the nozzles exit. So the (flushing) liquid gets safely into the Area where the belt sander 10, 12 the edges of the edges edit the glass blanks 3.

In the example of a transport unit shown in FIG. 4 62, the transport unit 62 has an endless conveyor belt 100 on, on which the lower, horizontal edge of the transportable or aufzusäumenden glass blank 3 stands up. Furthermore, two endless conveyor members 101, 102 are provided, which are connected to the Both side surfaces in the region of the edge of the glass blank 3 attack. One of the two endless conveyor members 101 is in Frame 103 of the transport unit 62 by means of a pressure medium motor 104 and a lever assembly 105 adjustable so that the distance between the two endless conveyor members 101, 102, which clampingly transport the glass blank 3 between them, adjusted to the respective glass thickness and the Required contact pressure for the slip-free conveying of glass blanks 3 can be applied. Preferably, the endless conveyor members 101, 102 equipped with pressure jaws, to the Engage glass blanks 3 frictionally. The drive of all Conveyor belts 100, 101, 102 carried by a common Drive motor 110 and a transmission 106, through which the outlet-side guide rollers 107, 108 of the endless conveyor belt 100 and the two lateral endless conveyor members 101, 102nd are driven.

When the belt grinders 10, 12 of the machining tool Nozzle arrangements 95 for applying a trimming support Liquid are assigned, it is recommended that the Abrasive belts 26 in the region of the deflection rollers 22, 24 by Fenders 96 cover to prevent excessive spraying of Prevent fluid. Especially when nozzle arrangements 95 are provided, the housing whose interior is through Doors accessible, beneficial.

In all embodiments of the method according to the invention, in particular the described embodiments, and as well in all embodiments of the device according to the invention, in particular the described embodiments, is on Beginning and end of edging the edges on one edge a glass cut preferably worked as follows:

At the beginning of the movement of a glass blank 3 relative to the Machining tool with a pair of belt grinders 10, 12, So if the glass blank 3 from a standstill on the Transport speed is accelerated, the Abrasive belts 26 of the belt sander 10, 12 with during the Acceleration phase of the glass blank 3 increasing contact pressure pressed against the edge of the glass blank 3 to be processed. Additionally or alternatively, the speed, with the abrasive belts 26 of the belt grinder 10, 12th be moved during the acceleration phase to the speed, with the sanding belts 26 of the belt sander 10, 12 are moved when trimming to be increased.

When the belt sander 10, 12 the end of the processed Edge of a glass blank 3 approaching while speed, with which the glass blank 3 relative to the Machining tool is moved, which can be reduced Speed at which the sanding belts 26 of the belt sander 10, 12 are moved, reduced and / or the contact pressure, with the abrasive belts 26 against the edges of the machined Edge of the glass blank 3 are pressed, reduced become.

These measures ensure that, on the one hand, the sanding belts 26 at the beginning and at the end of a Besäumvorganges not excessive loaded and damaged the processed glass blanks 3 be avoided.

The described changing the contact pressure of the abrasive belts 26th the belt sander 10, 12 and / or the speed at which the sanding belts 26 of the belt grinders 10, 12 are moved, So increasing the contact pressure and / or speed the abrasive belts 26 at the beginning of Besäumvorganges and reducing the contact pressure and / or the speed the abrasive belts 26 at the end of a Besäumvorganges, is preferred also applied when the editing tool along an edge of a glass blank 3 moves across aligned to the transport direction of the glass blanks 3, in particular perpendicular or substantially perpendicular.

The dispensed from the nozzle assemblies 95 rinse liquid is in the simplest case water. The feeding of rinsing liquid, especially of water, it is particularly recommended when abrasive belts 26 are used as diamond abrasive belts. When abrasive belts 26 are used, those with silicon carbide or another abrasive material, although the supply of rinsing liquid is recommended, but not necessarily required.

In summary, an embodiment of the invention For example, as shown below:

A device for trimming glass blanks 3 has at least one machining tool consisting of two each other cruising belt grinders 10, 12 simultaneously the edges of an edge of the glass blank 3 these edges attacking. The belt grinders 10, 12 are in the machine frame 1 pivotally mounted so that they are from a ready position in their original position at the edges of a border the glass blank 3, for example, for removal to be trimmed by ridges can be created. Thereby, the belt grinders 10, 12 are pivotably arranged, can their situation adapted to different thicknesses glass blanks 3 become.

Claims (24)

1. Method for preparing pieces of cut glass for further handling, in particular for the production of panes of insulation glass, both edges of each margin of a piece of cut glass being processed in order to remove burrs and the like at the same time by means of processing tools with respectively two belt grinders with endless abrasive belts, the planes in which the strands, which engage on the edges of the margins of a piece of cut glass, of the abrasive belts operate, intersecting in the region of the plane of a piece of cut glass, and all the margins of a piece of cut glass being processed, characterised in that, in succession, all the margins of a piece of cut glass, which is orientated vertically or substantially vertically, are processed in the region of their edges by means of a processing tool with two belt grinders with endless abrasive belts, and in that firstly the edges of the lower horizontal margin, then the edges of a first vertical margin, next the edges of the upper horizontal margin and finally the edges of the further vertical margin of the piece of cut glass are bevelled, the vertical margins, in the case of a stationary piece of cut glass, and the horizontal margins, in the case of a moving piece of cut glass, being processed.
2. Method according to claim 1, characterised in that the strands, which engage on the edges, of the abrasive belts, seen in the direction of movement of these strands of the abrasive belts, move towards each other before the positions in which they engage on the margins of a piece of cut glass.
3. Method according to claim 1 or 2, characterised in that, at the beginning of the movement of a piece of cut glass relative to the processing tool, the speed with which the abrasive belts are moved and/or the pressure with which the abrasive belts are pressed against the edges of a margin of a piece of cut glass is increased, whilst the relative speed of the movement of the piece of cut glass relative to the processing tool is increased.
4. Method according to one of the claims 1 to 3, characterised in that, at the end of the movement of a piece of cut glass relative to the processing tool, the speed with which the abrasive belts are moved and/or the pressure with which the abrasive belts are pressed against the edges of a margin of a piece of cut glass is reduced, whilst the relative speed of the movement of the piece of cut glass relative to the processing tool decreases.
5. Method according to one of the claims 1 to 4, characterised in that diamond abrasive belts or silicon carbide abrasive belts are used as abrasive belts.
6. Method according to claim 5, characterised in that a liquid for rinsing and/or cooling is supplied to the diamond abrasive belts in the region in which the abrasive belts engage on the edges of the margins of a piece of cut glass.
7. Method according to claim 6, characterised in that water is used as the rinsing and/or cooling liquid.
8. Device for bevelling the margins of pieces of cut glass, a conveying device (4, 62) being provided in order to move pieces of cut glass (3) horizontally past a processing tool (64) with a pair of belt grinders (10, 12) with abrasive belts (26), and the strands, which engage on the piece of cut glass (3), of the abrasive belts (26) of the belt grinder (10, 12) enclosing acute angles with the plane of the piece of cut glass (3) which is to be processed, and extending in planes which intersect each other in the region of the margin of the piece of cut glass (3), characterised in that, in order to implement the method according to one of the claims 1 to 7, a support wall (2) is provided for vertical or substantially vertical orientation of the piece of cut glass (3), and in that the processing tool (64) with the pair of belt grinders (10, 12) with abrasive belts (26) is mounted in the machine frame (1) rotatably about an axis which is perpendicular to the plane of the piece of cut glass (3) and displaceably up and down parallel to the plane of the piece of cut glass (3).
9. Device according to claim 8, characterised in that the belt grinders (10, 12) are mounted pivotably and can be pivoted by means of a motor (32, 34), preferably a pressure means motor, into an operative position in which their abrasive belts (26) engage on the margin of the piece of cut glass (3) which is to be processed.
10. Device according to claim 8 or 9, characterised in that the pressure with which the abrasive belts (26) are applied to the margin of the piece of cut glass (3) is adjustable.
11. Device according to one of the claims 8 to 10, characterised in that the speed with which the abrasive belts (26) are moved is adjustable.
12. Device according to one of the claims 8 to 11, characterised in that the abrasive belts (26) move towards the intersection region in which the margin of the piece of cut glass (3) which is to be processed is disposed.
13. Device according to one of the claims 8 to 12, characterised in that nozzle arrangements (95) are assigned to the belt grinders (10, 12), from which nozzles a liquid, which assists the bevelling of the edges of the margins of the piece of cut glass (3), is supplied.
14. Device according to claim 13, characterised in that the nozzles of the nozzle arrangement (95) are orientated in the direction of movement of the strands, which are adjacent to said nozzles, of the abrasive belts (26) of the belt grinders (10, 12).
15. Device according to one of the claims 8 to 14, characterised in that, between the deflection rollers (22, 24) for the abrasive belts (26) of the belt grinders (10, 12), support rollers (81) are provided in the region in which the abrasive belts (26) engage on the margins of the pieces of cut glass (3).
16. Device according to one of the claims 8 to 15, characterised in that the belt grinders (10, 12) carry guard plates (96) which are curved concentrically relative to the deflection rollers (22, 24).
17. Device according to one of the claims 8 to 15, characterised in that the processing tool (64) is displaceable vertically up and down from a standby position below the conveying mechanism (61).
18. Device according to claim 17, characterised in that, at the processing tool (64), guide rollers (78) and/or endless guide belts (79) are provided which are disposed in the region of the conveying mechanism (61) when a processing tool (64) is disposed in the standby position.
19. Device according to claim 17 or 18, characterised in that guide rollers (75) are provided at the processing tool (64) on the margins of pieces of cut glass (3).
20. Device according to claim 19, characterised in that the guide rollers (75) are mounted on bearers (76), freely rotatably about horizontal axes, the bearers being displaceable transversely relative to the plane of the pieces of cut glass (3).
21. Device according to one of the claims 8 to 20, characterised in that the device is fitted with a housing (60) in which the processing tool (64, 70, 71) and the conveying mechanism (61) for the pieces of cut glass (3) is disposed.
22. Device according to claim 21, characterised in that the conveying mechanism (61) is subdivided into a plurality of transport units (62).
23. Device according to claim 22, characterised in that each transport unit (62) has an endless conveyor belt (100), which supports the pieces of cut glass (3), and two endless conveying members (106) which engage on the faces of the pieces of cut glass (3).
24. Device according to claim 23, characterised in that the endless conveying members (106) are provided with pressure jaws which increase the frictional contact on the pieces of cut glass (3).

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