JPS594384B2 - glass plate cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for cutting a glass sheet along a cutting line having one or more sharp corners, which is carried by a carriage movable along a template proximate to the surface of the glass sheet. The present invention relates to an apparatus for carrying out cutting by means of a cutting tool, such as a cutting wheel, mounted on a movable tool carrier.

In known operations for cutting glass panes into shapes, for example in window glass manufacturing, cutting tools (usually cutting wheels) are used. The cutting part of the cutting wheel in contact with the glass plate is mounted on a tool carrier that can rotate freely around an axis perpendicular to the glass plate, and the tool is positioned behind the axis by a few meters. has been done. This lag arrangement creates a trailing section of the order of 2-3 mm, which stabilizes the tool during the straight cutting process. However, if the tool cuts a sharp corner, especially an acute angle, on the glass plate, the cutting tool will no longer follow the same path, but instead will cut a rounded corner when changing direction. I get used to it. For this reason, even under good conditions, it is impossible to cut a glass plate at an acute angle, resulting in a cutting power of 90 degrees. That is, the cut will not accurately follow the predetermined line at such an angle. When a given cutting shape has straight sides adjacent to two sharp corners, one straight edge is placed on the glass plate adjacent to said sides and said sides and in a single operation. It can be superimposed on two or three other edge soils to be cut.

However, this can only be done when the edge of the predetermined shape between the two corners is straight.

Furthermore, it is necessary to accurately position the outline of the shape to be cut. Of course, this is difficult and unacceptable. SUMMARY OF THE INVENTION It is an object of the present invention to provide a glass plate cutting device that can be applied to shapes with sharp corners and that can use a cutting tool that creates a closed and continuous path regardless of the shape to be cut.

According to the present invention, there is provided a cutting device for glass sheets, the cutting line of which has at least one sharp corner, comprising: a template; a carriage guided and moved along the template; and a carriage mounted on the carriage. a tool carrier, the carriage having a guide roller that rolls along the template while maintaining contact with the template, the guide roller having an axis perpendicular to the cutting line and a The tool carrier is rotatable;
The tool carrier has a cutting tool for making an incision in the glass plate at a point away from the axis of the guide roller inwardly of the template, and furthermore, the guide roller has a cutting tool for making an incision in the glass plate at a point remote from the axis of the guide roller. Correspondingly, means are provided for rotating the tool carrier about the axis of the guide roller when passing through the section of the template, so that the cutting blade also forms a loop around the axis of the guide roller in that section. Provided is a glass sheet cutting device that continues to advance in a new direction after passing the apex of a sharp corner for the second time.

This device makes it possible to easily cut sharp corners. Such loops occur in areas of the glass plate that are eliminated without loss outside the predetermined cutting geometry. Therefore, without lifting the tool from the glass plate surface,
Sharp corners can be formed between mutually intersecting cutting paths. Therefore, in a single operation, cuts of any shape with sharp corners can be achieved with good cut quality. The invention can also be used in different embodiments.

In the case of numerically controlled cutting machines, the trajectory is programmed according to the shape of the loop outside the sharp corner.
The majority of known cutting machines have a template for producing a predetermined cutting shape, and a tool carrier is mounted on the carrier, which freely pivots and carries a cutting tool, which is guided by guide rollers to the contour of the template. However, these machines are divided into two groups: machines of the first group, in which the carriage rotates 360 degrees during the course of a completely closed path in contact with the template; The carriages are divided into a second group of machine types, which maintain the same direction during the course of the process.

The first group of machines generally includes a template in the form of a frame. The guide roller moves against the inner surface of the frame and it is kept in contact by means of a positioning roller pressed by a spring against the outer contour of the frame. In the second group of machines, the pantograph maintains the same angular position of the carriage and a single guide roller is used which is held against the template by magnetic forces. The reference surface on which the guide roller rolls can be the external contour of the template or the internal contour of the template, and either type of cutting machine can be used. The principles of the invention can be applied to all known types of cutting machines mentioned above by introducing a mechanism for auxiliary separation of the cutting path from the template. According to an embodiment of the invention, the template always maintains its closed contour and it is the movement of the tool carrier or the carriage carrying the tool carrier that allows the tool to acquire a loop-shaped trajectory. .

This embodiment is realized in a cutting machine consisting of a carriage with three rollers pivoting in the corners of the template.

The axis of rotation of the tool is perpendicularly spaced from the cutting path which is directed into the cutting line with respect to the vertical axis of the guide roller. This separation is greater than the lag and is at least 5 mTIL, preferably 8-10 mm. In cutting machines in which the carriage maintains the same angular position as it advances along the template, this separation of the tool holder with respect to the axis of rotation of the carriage is maintained, and the said separation of the traces of the cutting path is achieved by the carriage itself. generally impossible to obtain.

In this type of machine, therefore, a tool carrier is provided in the lower part of the carriage, which is free to pivot and carries an arm on one side of the cutting tool, and on the other side the surface of the glass plate. It carries a balance roller that moves above. In this arrangement, in which the cutting tool and the retarded balance roller are symmetrical with respect to the vertical axis of rotation of the tool carrier, during cutting the arm supporting the two rollers is perpendicular to the cutting path. The cutting wheel must be positioned towards the interior of the template, ie towards the glass part where the desired cut shape is to be made. In this case, in the region of the corners the template has a radius of curvature very close to the radius of the guide roller, making it possible to achieve the desired result. In fact, when the carriage changes abruptly in the angular direction of the template, the balance roller traces an arc of curvature in the direction of carriage travel, and the cutting roller itself traces a narrower arc in the opposite direction of carriage travel. It is said circular arc that allows the tool to pass through the predetermined trajectory before returning in its path in a predetermined loop shape and stopping the return at the apex of the corner to be traced. The arm carrying the two rollers may be mounted for rotation about a horizontal axis on the device for supporting the tool, so as to provide a balancing pressure on the cutting roller and the balancing roller. As a balance roller, it is best to use a cutting roller with a pure cutting edge. The best results were obtained for the machine used in practice when the distance between the balance roller and the cutting roller was on the order of 16-20 m7IL. Hereinafter, specific examples of the present invention will be described with reference to the accompanying drawings.

FIG. 1 explains the cutting principle realized by the device of the invention when it is desired to cut a plate 2 into triangles 1 comprising an acute angle 3, a right angle 4 and a rounded corner 5. It is.

Cutting line S creates loops S3 and S near corners 3 and 4.
It has 4. To cut the corners 3 and 4, after tracing the first side of the triangle, the cutting tool passes through the apex of the corner and then cuts in one loop outside the corner of the plate 2 to be cut. Pass through the vertex of the desired corner and continue along the path to trace the second side of the triangle. The drawing is
It is shown why the cutting tool does not form small diameter arcs at the corners under these conditions. And extremely sharp corners can be obtained without much difficulty. FIGS. 2 and 3 show a cutting machine according to the invention with a template.

In these figures, only the essential parts of the machine are explained. Other parts, such as the positioning mechanism of the template, the structure of the positioning mechanism, the guidance and drive of the tool carrying carriage, and the control of the machine, are similar to known technology;
Therefore, I will not discuss it in detail. Referring to FIGS. 2 and 3, a carriage 26 for supporting a tool carrier 33 has guide rollers 28. As shown in FIGS.

The guide roller 28 is a template 25 that defines the course of the roller 28.
move along the inside of the contour. The carriage 26 can pivot around the axis of the roller 28 and can rotate through a predetermined angle when moving around the template 11. The tool carrier 33 is spaced a distance B inward of the template relative to the axis of the guide roller 28. This guide roller 28 lies on the axis of rotation of the carriage 26. This spacing between the cutting tool and guide roller 28 is not necessarily required in the practice of the invention. The invention can also be implemented by arranging the cutting tool on the axis of rotation of the guide roller. Line S is the cutting line traced by the tool.
The tool carriage 26 is held against the inner contour of the template 25 by a handle 27. The tool carriage is in contact with the inner contour of the template 25 by rollers 28. Rollers 29 and 30 follow the outer contour of template 25 and are kept in contact by springs 31 and 32. These rollers 29 and 30 are arranged so that the roller 28 is connected to the template 25
The function is to rotate the carriage 26 around the axis of the roller 28 after reaching the corner of the roller 28. 2nd, 3rd
The example shown in the figure is suitable for cutting right-angled corners from the glass plate 34.

The predetermined tracing of the cutting line S at the corner is performed as follows. The vertical axis of the tool carrier 33, which rotates freely and supports itself, is separated by a distance B from the vertical axis of the guide roller 28. This distance B is 5 mm or more, preferably 8 to 10 mm. Guide roller 28 finishes its linear tracing and roller 29
When the tool carriage 26 rotates under the action of and 30, a circular return movement is induced on the cutting tool due to the presence of said distance B. If the interval B is sufficient, the cutting line S takes a loop shape SE. After turning 90 degrees, the carriage continues its course and the tool traverses the initial cutting trajectory exactly at the acute apex in the glass sheet to be cut.

This process is repeated at the other corner of the glass plate.
Figure 4-7 shows a bearing 35 in which the tool carrier is a carriage 36.
The carriage 36 maintains a constant angular position during the entire cutting process of the glass sheet and is connected to an electric motor 37 via a motor roller 38 which acts as a guide roller.
Indicates a type of cutting machine driven by.

The roller 38 is magnetic and is in contact with the metal edge of the template 39. A rotatable tool carrier 42 is arranged in the bearing 35 . The axis of rotation of this tool carrier coincides with that of the rollers 38. The tool carrier 42 is mounted on ball bearings 43, 44 so that it rotates with minimal resistance. At the bottom of the tool carrier 42 is located an arm or horizontal bar 45 that can be rotated slightly about a horizontal axis 46 . Supports 47 and 48 are provided at both ends of the arm 45. A cutting wheel 49 is mounted on the support 47, while a balance wheel 50 is mounted on the support 48. This balance wheel has no cutting blades and serves to maintain the balance of the arm. The cutting wheel 49 and the balancing wheel 50 rotate about axes 51 and 52 that are separated by a certain lag T with respect to the axis of rotation of the tool carrier 42 . This T is about 33 dragons. This delay T helps stabilize tool carrier 42 during cutting. This distance between rollers 49 and 50 is of the order of 18 mm. The operating mode of this device is shown in FIG.

A tool carrier, not shown, moves as indicated by arrow F' and is guided by rollers 38 into contact with template 39.
At the start of the cutting operation, the tool carrier is oriented so that the cutting tool is positioned towards the interior of the board and traces line S5. The support ring 50 is blunted so as not to damage the glass surface to any extent. This roller marks a line S7'. Since the radius of curvature of the template at the corners is sufficiently small, it is possible to provide a sharp change in direction on the axis of the roller 38. As a result, arm 45
is rotated through an arc of a circle K, and the cutting wheel moves back in a curve K', while the attached roller 50 traces a curve of small radius. In this embodiment, the cutting tool will traverse the trajectory previously left on the glass plate at the exact location of the acute vertex to be traced.

[Brief explanation of drawings]

FIG. 1 is a plan view of a glass plate showing the cutting plane for cutting features with sharp corners according to the invention; FIG. 2 shows a template in which the template is unitary and has a carriage that can rotate during cutting; FIG. FIG. 3 is a sectional view taken along the line V--V of FIG. 2; FIG. 5 and 6 show a detailed view of the cutting head of FIG. 4; FIG. FIG. 6 is an explanatory diagram of the operation of the cutting device shown in FIGS. 2, 34... Glass plate, 3... Acute corner, 26, 36... Carriage, 28, 38...
...Guide roller, 25, 36... Template, 3
3,42...Tool carrier, 37...
Motor, 49... Cutting wheel, 50... Balance wheel.

Claims (1)

[Claims] 1 A device for cutting a glass plate with a cutting line having at least one sharp corner, comprising a template 25; 39, a carriage 26; 36 that guides and moves along the template, and is mounted on the carriage. a tool carrier 33; 42, which has a guide roller 28; 38 which rolls along the template while maintaining contact with the template, the guide roller having an axis perpendicular to the cutting line. a tool carrier rotatable about its axis, the tool carrier having a cutting tool for making an incision in the glass plate at a point spaced inwardly from the axis of the guide roller; and further means 29, 30, 31, 32 for rotating the tool carrier about the axis of the guide roller when the guide roller passes over the part of the template corresponding to the sharp corner of the glass sheet;
5, 37, so that the cutting tool makes a loop around the axis of the guide roller in that part, and after passing the apex of the sharp corner for the second time, continues its advance in a new direction. Glass plate cutting equipment.