Device for cutting rigid plates

Abstract

Device for cutting essentially rigid panels, in particular laminate flooring panels, with a frame (1), two support flanks (2) formed by the frame (1) and separated from one another by an insertion slot (3), and with a cutting blade (5) pivotably mounted on the frame (1) and having a toothed, blunt cutting edge (6) which, when cutting, inserts into the insertion slot (3), is delimited by cutting edges (6', 6"), characterized in that a first tooth edge rounding or bevel (9) of the cutting edge (6), produced on a first broad side (5') of the cutting edge (6) by the punching tool during punching of the toothing, is opposite a second tooth edge rounding or bevel (10) on the second broad side (5") of the cutting edge (6).

Description

[0001] The invention relates to a device for cutting essentially rigid panels, in particular laminate flooring panels, with a frame, two support flanks formed by the frame and separated from one another by an immersion slot, and with a cutting blade pivotably mounted on the frame and having a toothed cutting edge which immerses into the immersion slot during cutting.

[0002] DE 10 2009 003 490 A1 describes such a laminate cutter. The laminate cutter described therein is used for cutting a porous, essentially rigid panel, such as a laminate floorboard. The device has a frame with which the device can be placed on a surface, for example a floor. For this purpose, the frame forms feet. On the upward-facing side of the frame is a cutting blade, which is attached to the frame so that it can pivot about a cutting blade rotation axis. When the cutting blade closes from an open position to a closed position, a toothed cutting edge formed by the cutting blade enters a plunging slot flanked on both sides by support flanks. The workpiece to be cut can be placed on the support flanks. The cutting edge, which has an arc-shaped profile, penetrates the workpiece and plunges into the plunging slot.As the cutting edge passes through the workpiece, a strip of material is pressed out. The cutting blade has a blunt cutting edge that forms two cutting edges that dig into the surface of the workpiece. The cutting edge has a multitude of teeth arranged one behind the other. This toothing can be created by grinding or laser cutting. The two opposing broad sides of the cutting blade merge into the blunt cutting edge, forming an essentially 90° angle.

[0003] DE 41 34 878 A1 discloses a cutting bar for a chopping device with toothed edges. DE 10 2007 005 847 A1 discloses a sprocket made of sheet steel, which is produced by fine-stamping a sheet steel. DE 20 2008 015 612 U1 describes a device for cutting panels and composite boards, such as laminate flooring.

[0004] The invention is based on the object of providing a cutting knife that can be manufactured inexpensively.

[0005] According to the invention, the cutting blade is punched out of a sheet metal with a material thickness of just a few millimeters. The punching tool used has a contour corresponding to the toothing. When the toothing is punched, roundings or chamfers form on the tooth edges on the broad side of the cutting blade facing the punching tool due to the punching infeed. This results in the cutting edge assigned to this broad side running offset from the broad side plane. If a workpiece is cut with a cutting blade manufactured in this way, the cut describes an arc. To counteract this disadvantage, the invention proposes a second tooth edge rounding or chamfer which is arranged on the second broad side of the cutting edge and thus opposite the first tooth edge rounding or chamfer created by the punching process.As a result of this measure, the second tooth edge is also offset from its associated broad side of the cutting blade towards the center of the sheet, resulting in essentially symmetrical conditions regarding the tooth edge profile. Both cutting edges now merge into the respective broad side of the cutting blade, forming a wedge surface or rounding, so that the blunt cutting edge enters the workpiece like a wedge. The smooth-walled broad sides of the cutting blade glide along the cutting flanks. The second tooth edge rounding or chamfer is preferably created using a stamping tool. For this purpose, the punched-out blank of a cutting blade is placed on a lower tool of a stamping device and machined with a stamping tool, which produces the second tooth edge rounding or chamfer. This is preferably a stamping tool with an inclined stamping flank for creating an edge chamfer.Alternatively, it is also possible to grind the second tooth edge rounding or chamfer. The device according to the invention has a cutting edge that runs along a curved line and is formed by a toothing, with the tooth spacing in the range of 1 mm to 5 mm. The material thickness of the cutting edge is also in the range of 1 mm to 5 mm. The chamfer created by embossing or grinding can have a chamfer angle of approximately 10°. The chamfer width is approximately 2 mm.

[0006] An embodiment of the invention is explained below with reference to the accompanying drawings. They show: Fig. 1 a perspective view of a laminate cutting device with open cutting blade; Fig. 2 a plan view of the Fig. 1 device shown; Fig. 3 a side view of the Fig. 1 device shown; Fig. 4 a front view of the Fig. 1 device shown; Fig. 5 a plan view of a broad side of a toothed cutting blade; Fig. 6 a section along the line VI - VI in Fig. 5 and Fig. 7 schematically shows the blank of a cutting knife 5 lying between two stamping tools 12, 13 before stamping the second tooth edge rounding or chamfering 10.

[0007] The Fig.The laminate board cutting device shown in Figures 1 to 4 corresponds to the one described in DE 10 2009 003 490 A1, which is why reference is made to the explanations therein. The device has a frame 1 that can be placed on a surface. The frame forms two parallel support flanks 2 that define a horizontal plane. Between the two support flanks 2 for the workpiece to be cut is an insertion slot 3 that is only slightly wider than the material thickness of a cutting blade 5.

[0008] The frame 1 carries a stop 8 which is angle adjustable.

[0009] The cutting blade 5 is attached to the frame 1 so as to be pivotable about a rotation axis 4. The rotation axis 4 lies below the support flanks 2. The cutting blade 5 has two broad sides 5', 5" facing away from one another and is punched out of a steel sheet. When the cutting blade 5 is punched, a toothed cutting edge 6 is formed, which is formed by a narrow side of the cutting blade 5. During punching, a punching indentation 9 is formed on the broad side 5' facing the punch, which means that the cutting edge 6' assigned to this broad side 5' does not run in the broad side plane of the broad side 5', but is offset towards the opposite broad side 5" or towards the center of the sheet.

[0010] In a subsequent stamping process in a stamping tool, which has a lower tool 12, possibly in the form of a die, onto which the cutting blade 5 is placed, and which has an embossing punch as the upper tool 13, a chamfer 10 is produced. The embossing punch 13 has a stamping flank 14 which, during stamping, impresses a chamfer 10 into the broad side 5" in the area of ​​the cutting edge 6 having the teeth. During stamping of the chamfer 10, a punch burr 11 is simultaneously removed. The stamping flank 14 is designed such that the second cutting edge 6" produced during stamping is spaced approximately the same distance from its associated broad side 5" toward the sheet center as the cutting edge 6' is spaced from its associated broad side 5'. The cutting blade 5 then has cutting edges 6', 6" that run essentially symmetrically with respect to the broad sides 5', 5" and the sheet center, respectively.With such a punched cutting knife 5, straight cuts can be made due to the counter bevel 10.

[0011] The counterphase can be manufactured using a variety of suitable manufacturing processes. For example, the counterphase can be created by plastic forming or a machining process. List of reference symbols 1 frame 2 support flanks 3 Immersion slot 4 axis of rotation 5 cutting blades 5' broadside 5" broadside 6 cutting edges 6' cutting edge 6" cutting edge 7 Handle 8 stop 9 Cutting feed 10 bevel 11 Punching burr 12 Lower tool 13 embossing stamps 14 Embossing flank

Claims

[1] Device for cutting essentially rigid panels, in particular laminate flooring panels, with a frame (1), two support flanks (2) formed by the frame (1) and separated from one another by an insertion slot (3), and with a cutting blade (5) pivotably mounted on the frame (1) and having a toothed, blunt cutting edge (6) delimited by cutting edges (6', 6") which, when cutting, plunges into the insertion slot (3), characterized by that a first tooth edge rounding or chamfer (9) of the cutting edge (6) produced on a first broad side (5') of the cutting edge (6) during punching of the toothing as a result of the punching feed by the punching tool is opposite a second tooth edge rounding or chamfer (10) on the second broad side (5") of the cutting edge (6). [2] Device according to claim 1, characterized bythat the second tooth edge rounding or chamfer (10) is produced by plastic deformation, in particular by embossing by means of an embossing tool (13). [3] Device according to claim 1, characterized by that the second tooth edge rounding or chamfer (10) is produced by machining, in particular by grinding. [4] Device according to one of the preceding claims, characterized by that the cutting edge (6) runs on an arc line, in particular a circular arc line. [5] Device according to one of the preceding claims, characterized by that the cutting edges (6', 6") delimiting a blunt cutting edge (6) have substantially the same distance from the broad side (5', 5") assigned to them.

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