DE2461365A1 - METHODS AND DEVICES FOR CUTTING GLASS PANELS WITH POINTED CORNERS - Google Patents

Description

24613S5

VE 24-3

Applicant: Vereinigte Glaswerke GmbH

51 AACHEIi, Oppenhoffallee 14-3

Methods and devices for cutting glass panes with

sharp corners

The invention relates to a working method for cutting Glass panes with one or more pointed corners, in which a tool holder can be rotated freely around a vertical axis arranged scoring tool (cutting wheel) whose the The tip scratching the glass surface is offset by a small amount in relation to the axis of rotation of the tool holder (drag) the given shape is guided over the glass surface. The invention has. also various devices for implementation of the new procedure.

When cutting glass panes according to given shapes are today consistently cutting tools, especially cutting 'wheels, used in which the on the glass surface for Incoming tip action in relation to the axis of the free rotatable cutting tool holder is offset by a few millimeters. This displacement (drag) is necessary for the cutting wheel to stabilize when cutting straight lines. Shape cutting machines working with such drag wheels "

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are for example in the ÜS-PS 2 27o 418 and the DT-PS Λ 596 359 described,

When the tool holder is guided over the glass pane in the form of a sharp corner, the cutting wheel does the work itself not following this path. Rather arises as a result of Stabilization reasons necessary drag arrangement of the cutting wheel when passing through a sharp corner during the deflection of the cutting wheel an arc cut. It is therefore it is not possible to cut glass panes with geometrically perfect sharp corners using this method.

In order to get around this difficulty, one is with sheet glass molds with a straight edge and two pointed corners on this straight edge, for example, proceeded so that one used the straight edge of the glass sheet blank for the straight edge of the final sheet shape and the remaining three Pages cut in one go. Such a method is described in US-J ^ S 2 27o 418 (FIG. 1). This method however, it is only useful if the sharp corners bounded edge happens to be a straight edge. Otherwise is A disadvantage of this method is that the glass sheet blanks must be positioned very precisely, which in practice often leads to difficulties and increased scrap.

The invention is based on this prior art the task underlying a procedure and its implementation to create suitable devices that make it possible when using drag cutting wheels equipped Cutting tools in one go, i.e. with a self-contained cutting line applied to the pane of glass, also cut glass panes with geometrically perfect sharp corners.

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• The method according to the invention "consists in that the ' Cutting tool "when approaching the sharp corners over the Corner point led out, beyond the corner point loop-shaped traced back behind the already drawn cutting track, and under the crossing of the already drawn cutting track in the corner point the one adjoining the sharp corner Cutting track is executed

With the help of the new process, all angles that occur can be cut with perfect sharp corners. The swiveling movement of the cutting wheel now takes place outside the usable surface of the glass pane, so that the consequences of this swiveling movement are completely eliminated. Rather, the sharp corner is formed by two intersecting cutting traces without the cutting tool itself being lifted from the surface of the glass. in a single cutting process a glass pane of any 3? orm in perfect :? Cut quality can be made at the sharp corners,

The working method according to the invention can be implemented in different ways * If the model cutting machine is an automatic cutting machine with numerical path control, the looping turning process outside of the sharp corner is appropriately programmed in. ■ '■■■'

: Most of the cutting machines commonly used today, however, work with a template that corresponds to the desired disc shape, and on which a slide on which the freely rotatable Tool holder is arranged with the cutting wheel, with the help of a guide roller scanning the template along to be led./

. The known cutting machines can be incorporated into

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be divided, in which the slide during one revolution rotates along the template by 36o °, and in those in which the slide is in its angular position during one revolution along the template. The first-mentioned type of cutting machine is usually frame-shaped Template on · The guide roller arranged in the axis of rotation of the carriage runs along the inside of the template, and is counteracted by two pressure rollers that press against the outside of the stencil frame under spring pressure pressed the stencil.

To the cutting machines, in which the carriage is angular If the position does not change during the rotation along the template, the machines with which the slide is included belong a single roller is provided, which serves as a guide roller and is pressed against the stencil by magnetic force.

A further distinction can be made between cutting machines in which the outer contour of the template is scanned, and Such, with'Jdenen the leadership role on the inner contour of the The template moves along.

In all of the types of glass cutting machines mentioned, it can be used Realize the principle of the invention through suitable constructive measures.

According to a first basic embodiment, the inventive method by making constructive Changes made to the template. This embodiment is characterized in that the template in the area the sharp corners are interrupted, and to bridge this area one around the outside of the template lying pivot point in two end positions, in each of which one of the free legs of the template is attached.

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closes, swiveling template corner piece with a larger opening angle than the corresponding pane angle it is provided at the moment when the cutting tool goes over the sharp corner on the glass pane has run, can be pivoted from one end position to the other. It is preferable to pivot the Template corner piece from one end position to the other one operated by a limit switch operated by the slide Air cylinder provided.

According to another basic embodiment of the invention, the usual closed shape of the template is retained * whose inner contour is scanned by a guide roller arranged on the tool slide, and the loop-shaped movement of the cutting tool is due to design changes to the cutting tool or to those carrying the cutting tool Facilities achieved. The essential condition is that under the condition that the inner contour of the template in the The area of the sharp corner of the glass pane is rounded, whose radius corresponds approximately to the guide roller or slightly is larger, the cutting tool on the tool slide in. a distance is arranged perpendicular to the stencil path, the is larger than the radius of the guide roller or the radius of the rounding of the template in the corner.

According to a first operating according to this embodiment The embodiment is in cutting machines with a carriage rotating around the axis of the guide roller, the axis of rotation of the tool holder in relation to the axis of the Guide roller arranged eccentrically perpendicular to the cutting track in the direction of the center of the glass pane. The eccentric one Offset between the tool holder and the axis of the guide roller 'amounts to expediently at least 5mm, and preferably between 8 and 10 mm.

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The rotation of the carriage about the axis of the guide roller during a revolution along the template is most easily ensured in a known manner by two pressure rollers that roll on the side of the template frame opposite the guide roller. Such cutting head e. are also known as * three-roller heads ¹ .

In the case of a cutting machine with a carriage that adjusts its angular position during a revolution along the template does not change, as a result there is an eccentric displacement of the tool holder in relation to the axis of rotation of the slide and neither does an alignment of the offset with respect to the direction of the cutting track by the carriage itself possible. In such machines it is therefore provided according to a further embodiment of the invention that a horizontal lever is arranged at the lower end of the freely rotatable tool holder, which is on one side the cutting tool and on the other side a support wheel rolling on the glass surface.

In such an arrangement, in which a cutting wheel and a support wheel, each in tow, symmetrically at a mutual distance are arranged to the common tool holder rotatable about a vertical axis, the latter arises when executing the cut, always automatically that the lever carrying the two wheels is at right angles to the cutting line. The cutting wheel itself must be used to tune the Template, i.e. directed towards the usable surface of the glass pane. Under these conditions, the jockey wheel leads at one sudden change of direction of the slide, for example when passing through a corner in the template, make an arc in the direction of movement of the slide while the knife wheel even an arc-shaped countermovement around the

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Axis of the tool holder executes. Just this arc-shaped one However, countermovement forms the desired loop, as a result of which the previous cutting track when continuing to run of the sledge is crossed.

The lever on the tool holder is advantageously around a horizontal axis pivotably arranged, whereby an even pressure of the cutting tool and the Support wheel is guaranteed. It has also been shown that it is useful if a wheel corresponding to the cutting wheel with a truncated cutting edge is used as the support wheel Is used. The best results are achieved in the usual machines in practice, when the distance between the cutting wheel and the support wheel is 16 to 20 mm amounts to.

Further features and details of the invention emerge from the illustrations and the following description of various ^ .Examples. From the drawings shows

1 shows a cutting line made according to the new method for a pane of glass with sharp corners;

Fig. 2 is a partial representation of a cutting device according to the invention in a first. Embodiment in which the loop-shaped deflection by pivotable Stencil corners is reached;

Fig. 3 shows the device shown in Figure 2 after Swiveling the template corner; . ·

4 shows an embodiment of a cutting machine according to the invention with a rigid template and one revolves around oneself during an orbit standing carriage in a detail view from above;

FIG. 5 shows the cutting head shown in FIG. 4 in one vertical section along the line V-V;

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6 shows an embodiment for a cutting machine with a rigid template and one of its angular position maintaining carriage in a cross section through the cutting head;

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) Detailed representations from the diagram shown in Fig. 6

^Pig · ⁸ presented cutting head, and

Fig. 9 is a schematic representation of the operation of the shown in Figures' 6 to 8 Cutting machine *

Figure 1 shows the basic implementation of the new process, - woi> e4r- ^ H ± s-4effl-ia- ^ reieefesiorm-- the present glass pane blank 1 a pane of glass 2 with the acute-angled corner 3 "dei ?, right-angled corner 4- and the rounded corner Corner 5 is to be cut out. The cutting line S is at the acute-angled corner 3 and at the right-angled corner 4- according to the invention in the form of a loop Sx and S / j, respectively. guided. The cutting tool is guided out over the corner and outside the surface of the area to be cut Glass pane 2 pivoted in the form of a closed loop, in the direction of the adjoining edge of the Glass pane brought, and in this sighting then drawn over the cutting line already made. The representation makes it clear how, under these circumstances, the quality of a drag prelude when walking through a corner To drive a bow, is played over, and in any case flawless sharp corners result.

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A first embodiment of a model cutting machine working with a template, which carries out the "new" method is able, is shown in Figures 2 and 3. Only those that are essential to the invention are shown Features reproduced. All other features, such as the storage of the template, structure, storage, guidance and The drive of the carriage carrying the cutting tool, the control of the machine, etc. belong to the state of the art, so that the description can be limited to the essential features of the invention. -

A tool carrier 9 carrying the cutting tool 8 is attached to the inner contour of a by means of a guide roller 1o Template 11 guided along. The tool carrier 9 is rotatably mounted about the axis of the guide roller 1o, and rotates when going around the template by 36o. The angular position of the tool carrier 9 is determined by the pressure rollers 12 and 13 resting against the outer contour of the template. The holding arms 14-, I5 for the pressure rollers 12, 13 are arranged above the template. The pressure rollers ensure that the tool carrier 9 in the Corner areas of the template is rotated. The cutting tool 8 is 1o with respect to the axis of rotation of the guide roller and the coincident axis of rotation of the tool carrier 9 offset by the distance A to the inside of the template arranged. However, this distance between the cutting tool 8 and the guide roller 1o is not required in this embodiment of the invention. The procedure leaves Rather, this device can also be used when the cutting tool is in the axis of rotation of the guide roller is arranged. The one drawn by the cutting tool 8 Section line is denoted by S.

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With the help of the template 11 glass panes are to be cut that have two rounded corners and one pointed corner. The rounded corners can be adjusted with the help of appropriate Cut the curvature of the template 11.

To execute the cutting line at the sharp corner, the template 11 is interrupted in the area of this corner. This The area is bridged by the template corner 18, which can be pivoted about the axis 19 with the aid of the compressed air cylinder 2o is arranged. The template corner 18 can be pivoted into two end positions. The position in one The end position, as shown in FIG. 2, is determined by the stop 21. In this position lies the one Leg of the template corner 18, which has a significantly larger opening angle than that on the glass pane intersecting angle corresponds to one part of the interrupted Stencil frame 11. The other position is determined by the stop 22. It is shown in FIG. In this position, the other leg of the template corner 18 lies on the other part of the interrupted one Stencil frame 11.

The pivoting of the template corner 18 about the axis 19 takes place at the moment in which the tool carrier 9 in the corner of the stencil corner 18 has run in. At this moment is-: the cutting line is already over the top Corner of the glass to be cut out. When the template corner 18 is pivoted, the tool carrier forced a circular arc movement in the direction of arrow F (Fig. 3). This movement corresponds to a circular arc-shaped movement of the cutting tool in the same Senses. As soon as the template corner 18 has assumed its new position by resting against the stop 22, it sits down

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the cutting line continues in the new direction. The cutting line now crosses the "already drawn cutting line and" thus forms the desired pointed corner.

III in Figures 4 and 5, another embodiment is shown, in which a self-contained stencil frame 25 is used. Along the inner contour of this Template frame 25 is the tool holder 26 with the help of the handle 27 guided along. The tool carrier lies on the inner contour of the template frame by means of the guide roller 28 25 at. From the outside, the pressure rollers 2.9, 3o lie against the stencil frame. You will be using the Springs 31, 32 resiliently pressed against the stencil frame. They ensure that the tool carrier 26 is pivoted about the axis of the guide roller 28 in the template corners.

In the shownBÜ-cen ü'all should be made of d ^ ~ glass pane blank 34 a rectangular sheet of glass can be cut. The desired advance of the cutting line S in the corners is thereby achieves that the vertical axis of the freely rotatable tool holder carrying the actual cutting tool with respect to the vertical axis of rotation of the tool carrier, d. H. the vertical axis of the guide roller 28 around the Distance B perpendicular to the cutting line to the inside of the template is arranged too offset. The distance B. is at least 5 mm and preferably 8 to ~ 10 mm. He works in that Moment in which the guide roller 28 is driving straight ahead ended, and the tool holder 26 by the action of Pressure rollers 29, 3o is pivoted about the axis of the guide roller 28, a circular backward movement of the Cutting tool. Correspondingly, the line of intersection S makes a circular arc-shaped loop Sjj «If the

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witness carrier continues on its way after being pivoted by 90 °, the cutting track now crosses the previous cutting track exactly at the point of the sharp corner. In the rest The same process takes place in the corners of the template frame.

Finally, in FIGS. 6 ″ to 9 there is a cutting machine shown, in which the tool carrier 35 its angular position during a revolution along the template does not change. The tool carrier 35 is only hinted at shown cross slide 36 stored. He is by an electric motor 37 on the drive and Guide roller 38 driven. The driving and leading role. 38 is magnetized and is pressed against the template 39 by the magnetic force.

The rotatable tool holder 42 is located in the tool carrier 35 arranged. The axis of rotation of this tool holder 42 coincides with the axis of rotation of the drive and guide roller 38. The bearing is carried out by means of ball bearings 43, 44, so that the rotational resistance * is low. At the lower end of the tool holder 42, the horizontal lever 45 is arranged. The lever 45 is about the horizontal axis 46 by a little Dimension pivotable. At both ends of the lever 45 are downwardly similarly constructed mounts 47, 48 provided. In the holder 47 is the actual Senneidwheel 49 and arranged in the holder 48 a support wheel 5o. Both the cutting wheels 49 and the support wheel 5o run on axes 51 and 52, which are a certain distance T in relation to the axis of rotation of the tool holder 42 are offset. This distance, the so-called 'drag', is about 3mm. He takes care of the stabilization of the tool holder 42 during the cut. The opposite

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lateral distance between the cutting wheel 49 and the guide wheel 50 is about 18 mm.

The mode of operation of this device can be seen from FIG. The tool carrier, not shown, moves, driven and guided by the sleeve 3ß resting on the template 39, in the direction of arrow P ¹ along the template 39. Due to the drag arrangement of the wheels 4-9 and 50, the tool holder rotates at the beginning of the cutting process ι that the cutting wheel 49 is directed towards the inside of the template. It executes the cutting track labeled ^{S 1.} The guide wheel 50 has a truncated edge so that it does not scratch the glass surface itself, or only scratches it to an insignificant extent. There is a way. from, which ^{is denoted by S ri} .. At the transition from one direction to the other in the area -edn ^ rHBcice ■■ · ^ ίr eht — s ± cir-nun ~ der'Lever 45 in the sense of the circular arc K. This causes that the cutting wheel 49 executes a backward movement in the same direction of rotation (circular arc-shaped length cutting line K ¹ ) while the guide wheel executes a large circular arc K ¹ '. As in the previously described embodiments, the cutting tool now crosses the previously drawn cutting line at the point of the sharp corner when it continues to travel.

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Claims (1)

- 14- - - VE 24-3 Claims 1. Method of cutting glass sheets with one or more pointed corners, in which one on one around one perpendicular Axis freely rotatable tool holder arranged scoring tool (cutting wheel), whose the glass surface scratching tip is offset by a small amount relative to the axis of the tool holder (drag) along the predetermined shape is guided over the glass surface, characterized in that the Cutting tool when approaching the sharp corners over the Corner point led out beyond the corner point looped back behind the already drawn cutting track, and at the intersection of the already drawn cutting track at the corner point, the one following the sharp corner Cutting track is executed. ■■; .- * "■ 2. Device for performing the method according to claim 1, characterized by a numerical path control device, in which the loop-shaped turning process to the sharp corners is programmed. 3 device for performing the method according to claim 1, with a template, and one guided along the template with the aid of a guide roller that scans the template Carriage in which a freely rotatable tool holder is arranged around a vertical axis, the one opposite the The axis of rotation of the tool holder is offset by a small amount Carrying cutting tool, characterized that the template (11) is interrupted in the area of the pointed corners, 509830/0641 - 15 - VE 243 and to bridge this area one to one outside the fulcrum (19) lying on the template in two end positions, in each of which it adjoins one of the free legs of the template, pivotable Template corner piece (18) is provided with a larger opening angle than the corresponding pane angle, which at the moment in which the cutting tool (8) ran over the sharp corner on the glass pane from one can be pivoted into the other corner position. A-. Device according to claim 5 »characterized in that a compressed air cylinder (2o) operated by a limit switch operated by the tool carrier (9) is provided for pivoting the template corner piece (18) from one end position to the other. 5 device for performing the method according to claim 1, with a! Stencil frame and one with the help of a die Template scanning guide roller along the template guided carriage, which is along during the revolution the template rotates around the axis of the guide roller, and in which a freely rotatable around a vertical axis Tool holder is arranged, characterized that the rotatable tool holder (33) in relation to the axis of the guide roller (28) is arranged offset perpendicular to the cutting track in sighting towards the center of the glass pane. 6. Apparatus according to claim 5 * characterized in that the rotation of the tool carrier (26) about the axis of the guide roller (28) during a revolution along the Template (25) by arranging two resilient - 16 - 309330/0641 - 16 - VE 243 against the outer edge of the stencil frame (25) laying pressure rollers (29 ·, 3o) is ensured, while the Guide roller (28) on the inside edge "of the template frame (25) expires. 7. Apparatus according to claim 5 and 6, characterized in that that the eccentric offset (B) between the tool holder (33) and the axis of the guide roller (28) at least about 5 mm »and preferably 8 to 10 mm. 8. Device for performing the method according to claim 1, with a template and one with the aid of an inner contour the guide roller that scans the template and maintains its angular position during one revolution, and JLn.-Xl.Tin uo oRk-re-cirtre -axis freely rotatable Tool carrier is arranged, characterized in that at the lower end of the free rotatable tool holder (4-2) a horizontal lever (45) is arranged, on the one hand the cutting tool (49), and on the other side one on the glass surface unrolling support wheel (5o) carries. 9- device according to claim 8, characterized in that the lever (45) is arranged on the tool holder (42) so as to be pivotable about a horizontal axis (46). 1o. Device according to Claims 8 and 9j, characterized in that that as a cutting tool (49) a cutting wheel, and that as a support wheel (5o) a cutting wheel with a blunted Cutting edge is provided. - 17 - 509830/0641 .- 17 - VE 243 11. The device according to claim 8 to 1o, characterized in that the distance between the cutting wheels (49) and the support wheel (5 °) is 16 to 20 mm. 509830/084 1