AT526662A4 - Device for machining edges of flat workpieces - Google Patents

Abstract

A device (1) for machining edges on edges 10 of flat workpieces (8), for example glass panes, has two tools in the form of grinding rings (6). The tools each have a first, effective surface, for example a grinding surface (7), and in addition to the first grinding surface (7) a second, effective surface, for example a grinding surface (9). The tools, for example the grinding rings (6), can be used for removing or polishing. When the first grinding surface (7) is worn, the second grinding surface (9) can be used for machining after the grinding rings (6) have been turned or exchanged in order to arrange the second grinding surfaces (9) of the grinding rings (6) so that they face one another.

Description

Features of the introductory part of claim 1.

Devices for machining the edges of flat workpieces, in particular glass panes, are known in various embodiments. For example, there are devices with grinding wheels that are grooved. Reference is made to WO 2015/055671 A1, EP 1 607 177 B1 and EP 1 488 886 B1.

For the removal of flat workpieces, especially glass panes, in order to trim their edges,

EP 1 344 604 B1 or DE 44 19 963 C1 belt sanders are known.

In US 9,555,516 B2 it has been proposed to use cup-shaped grinding wheels to grip the edges of the rims of glass panes, with one grinding wheel being attached to one edge and one

other grinding wheel attacks the other edge.

Trimming devices with sanding belts (so-called "belt sanders"), especially with sanding belts arranged in a cross shape, have the advantage that the sanding belts can be flexibly applied to the edges of the workpiece. Therefore, the accuracy of the positioning of the workpiece (e.g. the glass pane) to the pane belts is not crucial. Overlaps and undercuts, edge surfaces that are not at right angles to the plane of the glass pane but are slanted, or workpiece shapes that deviate slightly from the desired shape due to cutting tolerances, as well as rejected (non-flat) workpieces can be trimmed without any problem. Deviations of the flat workpiece, such as a glass pane, from the specified shape and size are compensated for by the flexibility of the

Sanding belts balanced.

be processed evenly.

US 2,733,553 A shows and describes a tool for grinding knives or the like. The tool has two grinding wheels which are fixed to two sleeves by means of nuts. The sleeves are arranged on a shaft which is rotated by a motor and are held by springs in a central position in which they rest against each other. During grinding, the grinding wheels of the device known from US 2,733,553 A can be moved against the force of the springs so that the edges which are on both sides of a knife

or similar, can be processed.

The tool known from US 2,733,553 A is used for sharpening knives and similar cutting tools. Sharpening cutting tools on the one hand and machining edges on flat workpieces, such as glass panes, on the other hand, have different tasks to perform.

Reasons, When cutting flat workpieces, especially

Glass panes, deviations from the desired size and

Form, diagonal breaks, such as overbreaks and underbreaks, and a

can.

From WO 2021/013779 Al it is known to use slip rings that are set in rotation around an axis in a device for trimming plate-shaped workpieces, such as glass panes. The slip rings, which act on the edges of the edge of the workpiece in an abrasive manner, are movable in the axial direction so that they can follow the edges of the workpiece during trimming. The slip rings automatically apply themselves to the edges of the workpiece to be trimmed, even if the edges are not in the specified target position. The slip rings are mounted floatingly on their carrier via hydrostatic bearings or gas bearings. In the known device, the slip rings only have one active surface (grinding surface) that is inclined to their axis. This means that worn (worn)

Slip rings must be replaced with new slip rings.

Wheels for engraving glass are well known. These wheels have V-shaped profiles, coated with abrasive material, with a sharp edge that creates the engraving. For example, on “Grooving wheels - shape V” by Tyrolit

com). The known discs are only available for

Engraving of glass, where a glass surface is machined with the free edge of the V-shaped peripheral edge in order to

To create engravings, i.e. grooves, on the glass surface.

The invention is based on the object of providing a device for

to provide a solution that avoids complex conversion work, if

This object is achieved according to the invention with a device

having the features of claim 1.

Advantageous and preferred embodiments of the device according to the invention are the subject of

Subclaims.

The device according to the invention comprises at least one grinding ring with two active surfaces, such as grinding surfaces, for the removal or polishing of edges on flat workpieces, such as glass panes, which act on the edges of the flat workpiece in a removal/polishing manner. The device according to the invention can be used both for grinding (trimming) and for polishing edges of workpieces.

be designed and furnished.

Since in the device according to the invention the at least one slip ring has two effective surfaces for machining the workpiece, for example grinding surfaces, it is sufficient to align the slip ring after one of the effective surfaces has worn out, for example to turn it, so that the other - not yet worn - effective surface can be used for machining the workpiece.

can be.

For example, the at least one slip ring of the device according to the invention has two active surfaces facing away from each other, both of which are directed towards the axis of rotation of the slip ring

at an acute angle. The angles which the effective surfaces of the slip rings form with the

The rotation axis of the slip rings can be the same size or

be of different sizes.

or both grinding wheels are turned over.

If one of the working surfaces of the slip ring is worn out, it is sufficient to turn the slip ring over (turn it). If two slip rings are provided, the slip rings can be exchanged. After exchanging the slip rings, the working surfaces that have not yet been used face each other and the device according to the invention can be used with "fresh", i.e. not yet used working surfaces (grinding surfaces) for processing workpieces, for example for grinding (trimming) or

Polishing the edges of glass panes.

If the working surfaces of a grinding ring form angles of different sizes with the rotation axis of the grinding wheel, it is possible to achieve different results in the machining of the flat workpiece with one grinding ring. For example, one working surface can produce a bevel that is at an angle of 45° to the plane of the flat workpiece and, after turning the grinding ring, the other working surface can produce a bevel that is at an angle of 45° to the plane of the workpiece.

other angle, for example 60°.

Advantageously, the at least one slip ring can be mounted floating on its carrier (the inner diameter of the slip ring is larger than the outer diameter of the carrier), so that the slip ring on its carrier can move in the direction of the

(rotational) axis can move freely.

The floating bearing of the slip ring on the carrier can

designed as a hydrostatic bearing or as a gas (air) bearing

The exemplary design of the device with a hydrostatic bearing or gas bearing has the advantage that the coupling of the slip ring with its carrier, with which coupling the torque is transmitted from the carrier to the slip ring, can be designed in such a way that the floating

Storage of the slip ring is not adversely affected.

Within the scope of the invention, it can be provided that the at least one slip ring is elastically loaded so that when using the device with elastic

Preload is applied to the edge of the workpiece.

If springs are provided, in a possible embodiment of the invention with two slip rings, these ensure that the slip rings with their grinding surfaces return to the starting position of the grinding surfaces after use of the device.

be moved back.

A slip ring loaded by a spring, as well as two independent slip rings loaded by springs, provide the ability to follow the edges of the workpiece when the distance of the edge of the workpiece from the axis around which the device is rotated changes (becomes larger or smaller),

therefore does not remain in the desired position.

The device according to the invention combines in an exemplary embodiment with at least one spring-loaded slip ring, preferably two spring-loaded slip rings, the advantages of belt grinders with those of grinding wheels, since the effective surface of the slip ring or the effective surfaces of the slip rings in this embodiment are designed to be elastically flexible, i.e. under elastic (spring) prestress

rests on the edges of the workpiece.

7127

become.

In one embodiment of the invention, it is provided that a pin with sliding guide in a bore or recess in the

slip ring is accommodated.

The design of the coupling between the at least one slip ring and its carrier, provided in one embodiment of the invention, in the form of a pin which is fastened to the carrier and engages in a bore or recess in the slip ring, allows the floating bearing of the slip ring in the form of a hydrostatic bearing or a gas bearing to be designed without influence by the coupling between the slip ring and its carrier in such a way that a good

Storage of the slip ring is given.

The coupling of the at least one slip ring with its carrier to transfer torque from the carrier to the slip ring

can also be transmitted using a tongue and groove arrangement.

In a preferred embodiment of the invention, the active surfaces, such as grinding surfaces, are provided on two slip rings, which are arranged on the carrier so as to be movable relative to one another in the direction of the (rotational) axis and are resiliently

are too burdened.

On the carrier of the device according to the invention, in the

Usually two slip rings are provided.

However, the invention also includes embodiments in

Considered where the carrier has more than one pair

If two or more than two slip rings and/or pairs of slip rings are provided on the carrier, slip rings with differently shaped grinding surfaces

to be ordered.

The at least one grinding ring provided within the scope of the invention can be used for abrasive processing (e.g. grinding and trimming) and also for polishing the edges of workpieces

be designed.

If two or more than two slip rings are provided in the device according to the invention, a design of the slip rings with elevations (protrusions) on their side surfaces has proven to be useful. Such elevations have the advantageous effect of preventing the slip rings from sticking together.

is.

The term “spring” used here includes any type of elastic means acting on a slip ring or on the slip rings. Examples are: metallic springs (coil springs), gas springs (pneumatic springs) and

Fluid springs.

Further details and features as well as advantages of the invention will become apparent from the following description of the invention shown in the drawings, partly schematically.

Examples of implementation. It shows:

Fig. 1 in axial section two slip rings during the hemming of a glass pane,

Fig. 2 an embodiment with two slip rings on a carrier,

Fig. 3 shows in section another embodiment of the

Device and

Fig. 8 shows a section of the device from Fig. 7.

The embodiment of a device 1 shown in Fig. 2 comprises a carrier 12 serving as a (drive) shaft and two slip rings 6. The slip rings 6 are arranged on the carrier 12 so as to be displaceable in the direction of the axis 2 of the carrier 12, as

This is indicated in Fig. 2 by the arrows 13.

A line 14 for liquid supply (supply of water) is provided in the carrier 12, so that the slip rings 6 are mounted on the carrier 12 via hydrostatic bearings (floating). Instead of hydrostatic bearings for the slip rings 6, gas (air) bearings can also be provided. In the case of gas bearings, the

Gas (e.g. air) is supplied via line 14.

Supplied liquid (water) can exit through the gap 15 between the grinding rings 6 in the direction of the workpiece 8 (the glass pane to be processed), so that the workpiece 8, e.g. the glass pane, is cooled at its edge 10 by the liquid during processing in addition to the cooling by nozzles

cooled by water sprayed onto the workpiece.

The grinding rings 6 have as their effective surfaces first grinding surfaces 7, which are conically or concavely curved and when using the device 1 for machining the edges of an edge 10 of the workpiece 8 to be machined (glass pane), for example for

Formation of bevels by abrasive or polishing attack.

The slip rings 6 of the embodiment shown in Fig. 2

are springs 16, in the example coil springs, which are arranged between the slip rings 6 and shoulders 17 of the carrier 12

are loaded in the sense of a movement towards each other.

Since the slip rings 6 on the carrier 12 are loaded by the springs 16, the slip rings 6 can follow the course of the edge 10 of the workpiece 8 to be machined (glass pane) without special guidance measures being required. The reason for this is that the grinding surfaces 7 of the slip rings 6 are elastically resilient and, under spring pre-tension, rest against the edges of the workpiece 8 to be machined, such as a glass pane, even if the edge 10 of the

Workpiece 8 deviates from the desired position.

In order to couple the slip rings 6 to the carrier 12 for rotation, pins 18 are provided on one of the flanges 17 for torque transmission, which are guided by sliding guides in the slip rings 6.

holes 20 provided.

The slip rings 6 provided in the device 1 according to the invention have, in addition to the first slip surfaces 7 (active surfaces), second slip surfaces 9 (active surfaces). This is shown in the basic illustration in Fig. 1. The slip surfaces 7 and 9 carry as an abrasive means

for example a diamond coating 21 (see Fig. 1).

The second grinding surfaces 9 of the grinding rings 6 face away from the

first grinding surfaces 7 of the slip rings 6. Both the first grinding surfaces 7 and the second grinding surfaces 9 of the slip rings 6 are aligned with the axis 2

an acute angle, especially an angle of 45°.

The angles which the first grinding surfaces 7 and the second

Grinding surfaces 9 with the axis 2 at the positions shown in the drawings

shown embodiments of the device 1 according to the invention are preferably of the same size. However, embodiments in which the grinding surfaces 7 and 9 are aligned with the axis 2 in different ways are also considered within the scope of the invention.

enclose large (acute) angles.

It can be seen that the grinding rings 6 with grinding surfaces 7 and 9, which enclose equal angles with the axis 2, can be turned in order to align the second grinding surfaces 9 instead of the first grinding surfaces 7 in such a way that the second grinding surfaces 9 face each other and can be used to machine a

workpiece 8 can be used.

The turning of the slip rings 6 is carried out as soon as the first

Grinding surfaces 7 are worn.

The step of arranging the second grinding surfaces 9 of grinding rings 6 with grinding surfaces 7 and 9, which enclose equal angles with the axis 2, in such a way that they face each other and can be used to machine the edges on an edge 10 of the workpiece 8, can also be carried out by exchanging the two grinding rings 6. Thus, the initially left-hand grinding ring 6 in Fig. 2 takes the place of the initially right-hand grinding ring 6 in Fig. 2 and the initially right-hand grinding ring 6 in Fig. 2 takes the place of the initially right-hand grinding ring 6 in Fig. 2.

left slip ring 6.

In order to be able to turn or exchange the slip rings 6, the carrier 12 is divided - as indicated in Fig. 2 - so that the part 22 arranged on the right in the example of Fig. 2 can be removed from the other part of the carrier 12 after loosening the connecting means (screws or threads) not shown. After removing the part 22, the slip rings 6 can be pulled off the carrier 12 and after

Turning or changing places pushed back onto the carrier 12

become.

In the embodiment of the device 1 according to the invention shown in Fig. 3, several pins 18, which are arranged at different distances from the axis 2, are provided for transmitting the torque from the carrier 12 to the slip rings 6. The pins 18 engage slidingly in

Holes 20 in rings 25 and 26.

The slip ring 6 arranged on the left in Fig. 3 is connected to the radially outer ring 25 by screws 27, whereby between a flange 29 of the outer ring 25 and the grinding wheel 6

a disc 28 is provided.

The slip ring 6 arranged on the right in Fig. 3 is connected via a pot 30 which is attached by screws 31 to the radially inner ring 26

is attached via screws 32.

The assembly, comprising the grinding ring 6 on the left in Fig. 3, the disk 28 and the outer ring 25, is displaceable on the carrier 12 relative to the grinding disk 6 on the right in Fig. 3 in the direction of the axis 2. The distance between the grinding disks 6 can thus be adjusted to the thickness of the flat

Workpiece 8 (glass pane).

In addition, the assembly comprising both slip ring 6, the radially inner ring 26 and the radially outer ring 25 on the carrier 12 is movable in the direction of the axis 2 because it is floating.

stored.

In the embodiment of the device 1 according to the invention shown in Fig. 3, the carrier 12 is composed of several parts. These parts are a hollow core 33,

a sleeve 34 accommodating the core 33, two terminal

Washers 35 and a cap screw 36, which closes the cavity in the

Core 33 closes at one end.

In the embodiment of the device 1 shown in Fig. 3, a hydraulic or pneumatic spring force is produced due to areas 40, 41 of the rings 25 and 26 with different sliding diameters, which presses the slip rings 6 against one another. Fig. 3 shows that the sliding diameter between the right-hand end of the outer ring 25 in Fig. 3 and the adjacent right-hand end of the inner ring 26 (area 40) is smaller than the sliding diameter at the left-hand ends of the rings 25 and 26 in Fig. 3 (area 41). Under the effect of the fluid (air or water) flowing through the line branches 24, the spring force which presses adjacent slip rings 6 against one another is produced due to the areas 40 and 41 with different sliding diameters. In order for the spring force that presses adjacent slip rings 6 together to occur, a throttleable relief bore 51 that leads to the outside through the flange 29 is provided in the radially outer ring 25. Fluid such as water that is fed centrally through the line 14 can flow out through the relief bore 51 in addition to flowing out through the bearing gap. A throttle point that can be adjusted using a throttle screw 52 is provided at the outer end of the relief bore 51. The size of the spring force that presses the slip rings 6 together can be determined by selecting the amount of fluid such as water that is fed in, on the one hand, and by adjusting the throttle cross-section of the throttle point, on the other hand. In Fig. 3, the relief bore 51 is shown symbolically as a dashed line for the sake of clarity, and the throttle screw 52 as a rectangle. A relief bore corresponding to the relief bore 51 and having a throttle point can also be provided in the embodiment of the device 1 shown in Fig. 8

and lead it outwards, for example, through the sleeve 48.

The embodiment of a slip ring 6 shown in Fig. 4 to 6 has six elevations 43 (protrusions) on each side surface 42 of the slip ring 6, which prevent the side surfaces 42 of adjacent slip rings from lying flat against one another. This prevents slip rings 6 from sticking to one another. The elevations 43 have a small height, which is in the order of tenths of a millimeter.

and is, for example, 0.1 mm.

The embodiment of the device 1 according to the invention shown in Figs. 7 and 8 has an arrangement with springs 45 that engage in grooves 44 for transmitting the rotation of the carrier 12 to the slip rings 6. In the example shown in Figs. 7 and 8, grooves 44 are provided in a flange 46 that projects radially from the carrier 12. The springs 45 that engage in the grooves 44 are attached to a flange 47 that extends from

a sleeve 48 protrudes radially outwards, screwed-on strips.

The sleeve 48, on which the slip rings 6 sit and are held by a nut 49, can be moved on the carrier 12 in the direction of the arrow 13 via a fluid bearing, e.g. a hydrostatic bearing or a pneumatic bearing. The fluid (air or water) flows through the line 14 and the line branches 24 into the annular space 37 between the core 33 of the carrier 12 and the sleeve 48 and forms hydrostatic or pneumatic bearings 50 next to the space 37. Fluid enters

between the core 33 and the sleeve 48.

In summary, an embodiment of the invention as

described as follows:

A device 1 for machining edges 10 of flat workpieces 8, for example glass panes, has two tools in the form of grinding rings 6. The tools have

a first effective surface, for example a grinding surface

7, and in addition to the first grinding surface 7, a second effective surface, for example a grinding surface 9. The tools, for example the grinding rings 6, can be used for removing or polishing. When the first grinding surface 7 is worn, the second grinding surface 9 can be used for machining after the grinding rings 6 have been turned or exchanged in order to arrange the second grinding surfaces 9 of the grinding rings 6 so that

to point them at each other.

Claims (1)

Patent claims: Device (1) for machining edges on edges (10) of flat workpieces (8), for example glass panes, with at least one grinding ring (6) which has a first active surface, in particular a grinding surface (7), characterized in that the at least one grinding ring (6) has, in addition to the first active surface, such as a grinding surface (7), a second active surface, such as a grinding surface (9). Device according to claim 1, characterized in that the first active surface, such as a grinding surface (7), and the second active surface, such as a grinding surface (9), form an acute angle with the axis (2) of the carrier (12), especially 45°. Device according to one of claims 1 or 2, characterized in that the active surfaces, such as the grinding surfaces (7 and 9), point in opposite directions and preferably to the center plane of the grinding ring (6) are symmetrical. Device according to one of claims 1 to 3, characterized in that a carrier (12) for the slip ring (6) is provided, which is driven in rotation about an axis (2), that the slip ring (6) is connected to the carrier (12) is coupled for rotation. Device according to one of claims 1 to 4, characterized in that the slip ring (6) on the carrier (12) is arranged to be movable in the direction of the axis (2) Device according to claims 1 to 5, characterized in that on the carrier (12) next to each other two slip rings 11. 12. 13. 17 (6) or more than two slip rings (6) are arranged. Device according to one of claims 1 to 6, through this characterized in that the slip ring (6) is guided by the carrier (12) is arranged detachably. Device according to one of claims 1 to 7, through this characterized in that the slip ring (6) on the carrier (12) floating, in particular via a hydrostatic Bearing or gas bearing floating. Device according to one of claims 1 to 8, through this characterized in that for coupling the slip ring (6) with the carrier (12) at least one pin (18) as a driver and/or guide is provided that the pin (18) on the carrier (12) and that the pin (18) is in a Bore (20) or recess in the slip ring (6) intervenes. Device according to claim 9, characterized in that the pin (18) in the bore (20) or recess of the Slip ring (6) with sliding guide. Device according to one of claims 1 to 8, through this characterized in that for coupling the slip ring (6) with the carrier (12) has a tongue and groove arrangement (44, is provided. Device according to one of claims 1 to 11, 45) through this characterized in that the slip ring (6) is elastically resilient is burdened. Device according to one of claims 1 to 12, through this characterized in that the first and second Effective surfaces, such as grinding surfaces (7 and 9), conical or 15. 16. 17. 18. concave 18 et are. Device according to one of claims 6 to 13, characterized marked, (12) in the direction are. Device for the slip rings are burdened. Device for the slip rings Springs loaded that the slip rings (6) on the carrier the axis (2) Claim 14, (6) by Feder Claim 15, arranged movably characterized in that n(11) towards each other characterized in that (6) pneumatic or hydraulic are. Device according to one of claims 1 to 16, characterized marked, that in the carrier (12) at least one line (14) for the supply of liquid or gaseous medium, like water of the L pipe (14) Lei inner surface of the Carrier (12) mün Device according to uft, is provided and that the branches (24) slip ring the. Claim 17, branch off between the (6) and the outer surface of the characterized in that at least one annular space is provided, which partially from the slip ring that the management (6) is limited, and (14) for supplying the liquid or gaseous medium flows into the annular space.