Cutter equipped with cutting blade sharpening mechanism and cutting blade sharpening method for cutting machine

Abstract

To provide a cutter equipped with a cutting blade polishing mechanism which does not require a dedicated elevating / lowering actuator and can expand a polishing range of an upright cutting blade, and a cutting blade polishing method for a cutter.SOLUTION: Switching of an R axis unit 4 between an original position and an upper position is performed by a controller 10 controlling Z axis movement means 7. An elevating / lowering mechanism 6 is a pneumatic cylinder or the like, is fitted to the R axis unit 4, and is capable of elevating / lowering a reciprocation unit 5. Even when the R axis unit 4 is switched between the origin position and the upper position, a stopper to be regulation means 9 stops the reciprocation unit 5 at a regulation position, a cutting blade polishing mechanism 8 relatively rises, and a polishing range of an upright cutting blade 2 extends.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cutting machine equipped with a cutting blade sharpening mechanism capable of sharpening a cutting blade, and a method for sharpening the cutting blade of a cutting machine. [Background technology]

[0002] Conventionally, cutting machines used to cut sheet material have a cutting table on which the sheet material is placed and a cutting head. The cutting head is movable along the surface of the cutting table and is equipped with a cutting blade for cutting the sheet material placed on the cutting table. In the case of an upright cutting blade that cuts the sheet material by piercing it while repeatedly moving up and down, the cutting head also includes a cutting blade reciprocating unit and a cutting blade sharpening mechanism (see, for example, Patent Document 1 and Patent Document 2). The cutting blade sharpening mechanism is built into an R-axis unit that changes the cutting direction of the upright cutting blade around the R-axis in the vertical direction.

[0003] In the cutters described in Patent Documents 1 and 2, the upright cutting blade is raised from a position where it is piercing the sheet material to a standby state where it is not cutting the sheet material. The reciprocating unit moves the upright cutting blade up and down, while the cutting blade sharpening mechanism sharpens it by bringing a grinding wheel into contact with the side of the blade. It also discloses a system that detects the thickness of the stacked sheet material and adjusts the amount of lift to the standby state depending on the thickness. The cutter described in Patent Document 1 transitions between the cutting state and the standby state using a Z-axis movement mechanism that moves the R-axis unit and the reciprocating unit up and down in the Z-axis direction. The cutter described in Patent Document 2 does not use the Z-axis movement mechanism described in Patent Document 1; instead, the R-axis unit is kept at a constant height and only a lift actuator is used to raise and lower the reciprocating unit. When the stacked sheet material is thin, the lift of the reciprocating unit by the lift actuator is restricted by a switching actuator that activates a lift stopper to prevent the cutting blade from rising unnecessarily. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-60686 [Patent Document 2] Japanese Patent Application Publication No. 2019-107756 Summary of the Invention [Problem to be solved by the invention]

[0005] The range in which the cutting blade sharpening mechanisms of Patent Documents 1 and 2 sharpen the upright cutting blade is mechanically constant due to the reciprocating unit and the cutting blade sharpening mechanism. However, Figure 5 of Patent Document 2 describes an example in which the sharpening range is expanded by switching the action of an elevation stopper. Paragraph 0039 also states, "Conventionally, such range expansion has been achieved by providing a dedicated actuator. In this example, the switching actuator 12 can serve as both." Here, "conventionally" refers to Patent Document 1 and other documents. The "dedicated actuator" is provided to raise and lower the R-axis unit to switch the sharpening range, as will be described later in Figure 5 of this application.

[0006] The vertical cutting edge length of an upright cutting blade is equal to the maximum stack thickness of sheet material that can be cut, plus a margin. As stack thickness increases, the upright cutting blade required for cutting must also have a longer cutting edge, and the required grinding range also increases. However, the grinding range is also limited by the width of the grinding wheel and the vertical stroke of the reciprocating unit. When the grinding range is insufficient due to the limited grinding range, the grinding range must be expanded by switching. However, expanding the grinding range by using a lifting actuator to raise and lower the reciprocating unit, as in Patent Document 2, results in constant acceleration and speed of the lift, resulting in a lack of control flexibility. Furthermore, expanding the grinding range as in Patent Document 1 requires a dedicated actuator to raise and lower the R-axis unit.

[0007] The object of the present invention is to provide a cutting machine equipped with a cutting blade sharpening mechanism that has a degree of control freedom, does not require a dedicated actuator to raise and lower the R-axis unit, and can expand the sharpening range of the upright cutting blade, and a cutting blade sharpening method for the cutting machine. [Means for solving the problem]

[0008] The present invention is directed to a method for horizontally Table a cutting table placed on the surface; Along the cutting table surface a movable cutting head; The cutting head is The cutting edge extends vertically perpendicular to the surface of the cutting table. Surface an upright cutting blade for cutting a sheet material placed thereon; The direction of the cutting edge of the upright cutting blade is Parallel to the vertical direction The R-axis unit can be easily changed around the R-axis. a reciprocating unit that holds an upright cutting blade and can reciprocate it in the upright direction; For the R-axis unit Reciprocating unit 、 Within a preset stroke range 、 a lifting mechanism capable of raising or lowering the device in a vertical direction; The R-axis unit and lifting mechanism are parallel to Z-axis moving means for moving in the Z-axis direction; The R-axis unit is equipped with a cutting blade sharpening mechanism, The cutting blade sharpening mechanism can sharpen the reciprocating upright cutting blade when not cutting. In a cutting machine equipped with a cutting blade sharpening mechanism, When sharpening the upright cutting blade with the cutting blade sharpening mechanism, Control the lifting mechanism to raise the reciprocating unit, a control device that controls the Z-axis moving means and can switch and raise the R-axis unit between an origin position set as a position where the upright cutting blade moves upward from the sheet material and an upper position set above the origin position; a restricting means for restricting the position of the reciprocating unit so that it does not rise above a restricting position set above the R-axis unit, even when the R-axis unit is switched so as to rise from the origin position to an upper position by the movement of the Z-axis moving means; The cutting machine is equipped with a cutting blade sharpening mechanism, which includes:

[0009] In the present invention, the origin position can be changed in accordance with the thickness of the sheet material placed on the cutting table, The restricting means is capable of changing the restricting position of the reciprocating unit in accordance with the changed origin position. It is characterized by:

[0010] The present invention also includes a thickness detection means for detecting the thickness of the sheet material, The restricting means is capable of controlling a change of the restricting position, The control device Depending on the thickness of the sheet material detected by the thickness detection means, determining whether or not switching between the origin position and the upper position in the Z-axis moving means is necessary, and if it is determined that switching is not necessary, setting only the origin position, and if it is determined that switching is necessary, setting the origin position and the upper position; controlling the restricting means to make the restricting position of the reciprocating unit correspond to the set origin position; It is characterized by:

[0011] In the present invention, the upper position is set so that a sharpening range of the upright cutting blade by the cutting blade sharpening mechanism partially overlaps with a sharpening range at the origin position, The control device controls the Z-axis moving means and adjusts the moving speed between the origin position and the upper position so that the speed is slower in the non-overlapping portion than in the overlapping portion where sharpening by the cutting blade sharpening mechanism is performed. It is characterized by:

[0012] Furthermore, the present invention provides a method for horizontally Table a cutting table placed on the surface; Along the cutting table surface a movable cutting head; The cutting head is The cutting edge extends vertically perpendicular to the surface of the cutting table. Surface an upright cutting blade for cutting a sheet material placed thereon; The direction of the cutting edge of the upright cutting blade is Parallel to the vertical direction The R-axis unit can be easily changed around the R-axis. A reciprocating unit that holds an upright cutting blade and can move it up and down; For the R-axis unit Reciprocating unit 、 Within a preset stroke range 、 a lifting mechanism capable of raising or lowering the device in a vertical direction; The R-axis unit and lifting mechanism are parallel to Z-axis moving means for moving in the Z-axis direction; The R-axis unit is equipped with a cutting blade sharpening mechanism, The cutting blade sharpening mechanism can sharpen the reciprocating upright cutting blade when not cutting. In a method for sharpening a cutting blade of a cutting machine, A restricting means is provided above the R-axis unit to set a restricting position, The lifting mechanism raises the reciprocating unit, The Z-axis moving means switches the position of the R-axis unit between an origin position where the upright cutting blade is set to be positioned above the sheet material and an upper position set above the origin position, Even when the R-axis unit is switched to rise from the origin position to an upper position by the movement by the Z-axis moving means, the position of the reciprocating unit is fixed by the regulating means so that it does not rise above the regulating position, and the upright cutting blade is sharpened by the cutting blade sharpening mechanism. The present invention relates to a cutting machine blade sharpening method. [Effects of the Invention]

[0013] According to the present invention, even when the R-axis unit is switched between the home position and the upper position by movement by the Z-axis moving means, the position of the reciprocating unit is kept at the regulated position by the regulating means. The sharpening range of the upright cutting blade that hangs down from the regulated position of the reciprocating unit can be expanded by relative movement of the R-axis unit, which is equipped with the cutting blade sharpening mechanism. Expanding the sharpening range does not require the use of a dedicated lifting actuator to raise and lower the R-axis unit, and because movement is by the Z-axis moving means, the degree of freedom of control can be increased.

[0014] Furthermore, according to the present invention, even if the origin position is set to be appropriate according to the thickness of the sheet material, by changing the regulating position of the reciprocating unit by the regulating means, the upright cutting blade can be efficiently sharpened within the changed sharpening range.

[0015] Furthermore, according to the present invention, the thickness of the sheet material is detected, and depending on the thickness, it is determined whether or not it is necessary to expand the sharpening range of the upright cutting blade by switching between the origin position and the upper position, and sharpening can be performed in an appropriate sharpening range depending on the thickness.

[0016] Furthermore, according to the present invention, when the R-axis unit is moved by the Z-axis moving means to expand the sharpening range, overlapping sharpening areas occur in the sharpening range of the upright cutting blade. During movement, the movement speed of the non-overlapping areas is made slower than that of the overlapping areas, so adjustments can be made to prevent excessive sharpening due to overlapping sharpening.

[0017] Furthermore, according to the present invention, the sharpening range of the upright cutting blade can be expanded and sharpened by moving the R-axis unit equipped with a cutting blade sharpening mechanism using the Z-axis moving means, without using a dedicated lifting actuator to raise and lower the R-axis unit. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a block diagram showing a schematic diagram of switching between an origin position and an upper position for expanding the sharpening range of an upright cutting blade 2 in a cutting machine 1 according to an embodiment of the present invention. [Figure 2]FIG. 2 is a simplified cross-sectional view of the cutting head 3 in the embodiment of FIG. 1, including the change of the origin position according to the thickness of the stacked sheet material 20. [Figure 3] FIG. 3 is a partial front view illustrating the reason why overlapping portions of the upright cutting blades 2 occur in the sharpening range. [Figure 4] FIG. 4 is a flow chart showing a control operation in the embodiment of FIG. [Figure 5] FIG. 5 is a block diagram showing a schematic diagram of a conventional example in contrast to FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] 1 to 4 show the configuration and operation of a cutting machine 1 according to one embodiment of the present invention. FIG. 5 shows a conventional example related to FIG. 1. Corresponding parts in each drawing are designated by the same reference numerals, and duplicated explanations may be omitted. For the sake of convenience, parts not shown in the drawing being explained may be referred to by the reference numerals shown in other drawings. [Example]

[0020] FIG. 1 shows a schematic diagram of a cutting machine 1 according to an embodiment of the present invention and the operation of sharpening an upright cutting blade 2. The cutting machine 1, used to cut sheet material, includes a cutting table on which the sheet material is placed and a cutting head 3, although the sheet material and cutting table are not shown in this figure. Only a portion of the interior of the cutting head 3 is shown. The cutting head 3 is movable in two dimensions along the horizontal X and Y axes along the surface of the cutting table and is equipped with an upright cutting blade 2 for cutting the sheet material placed on the cutting table. The upright cutting blade 2 pierces the sheet material with its lower edge, and then cuts the sheet material by repeatedly moving up and down while bringing the edge of the cutting edge extending from the edge to the upper right in the figure into contact with the sheet material. The cutting head 3 also includes an R-axis unit 4 and a reciprocating unit 5. The R-axis unit 4, located below the cutting head 3, changes the orientation of the cutting edge of the upright cutting blade 2 around the R-axis, which is perpendicular to the surface of the cutting table, to change the cutting direction. The reciprocating unit 5, located above the cutting head 3, holds the upper part of the upright cutting blade 2, causing the blade portion extending from the cutting edge to hang down, and reciprocates the upright cutting blade 2 up and down. The cutting head 3 is equipped with an elevator mechanism 6 that raises the reciprocating unit 5 relative to the R-axis unit 4 to switch between a standby state in which the upright cutting blade 2 does not cut sheet material and a state in which the reciprocating unit 5 is lowered to enable cutting. The elevator mechanism 6 supports the reciprocating unit 5 and can raise or lower it within a preset stroke range. The cutting head 3 is equipped with a Z-axis movement means 7 that moves the elevator mechanism 6 and the R-axis unit 4 up and down in the Z-axis direction relative to the cutting table, and a cutting blade sharpening mechanism 8 that sharpens the upright cutting blade 2 in the standby state. The upright cutting blade 2 is sharpened by the cutting blade sharpening mechanism 8 while the reciprocating unit 5 moves the upright cutting blade 2 up and down. The cutting head 3 also has a regulating means 9 for expanding the sharpening range. The cutting machine 1 has a control device 10 that controls cutting and sharpening. A fabric presser foot 11 that can be placed on the surface of the sheet material is provided below the cutting head 3.

[0021] The cutting blade sharpening mechanism 8 is built into the R-axis unit 4 and is equipped with a grindstone that grinds by contacting the surface that slopes from the cutting edge to the side of the upright cutting blade 2. Grinding restores the sharpness of the cutting edge, but shortens the tooth width from the cutting edge. The grindstone can be a drum type that grinds with a cylindrical outer periphery, a disk type that grinds with a disc-shaped surface, or a belt type that grinds with the surface of a rotating belt. These grindstones grind the area that comes into contact with the upright cutting blade 2, so even if the upright cutting blade 2 is moved up and down by the reciprocating unit 5 while being sharpened, only a certain area can be sharpened.

[0022] In this embodiment, to expand the grinding range, the position of the R-axis unit 4 during grinding is switched between the original position shown in FIG. 1(a) and the upper position shown in FIG. 1(b), and grinding is performed in each position. The original position is set as the position where the upright cutting blade 2 is removed from the sheet material. At the original position, the upright cutting blade 2 is retracted to a height where the cutting edge does not pierce the sheet material even when repeatedly moved up and down by the reciprocating unit 5. At the original position, it is preferable to also raise the fabric presser foot 11 so that it is separated from the surface of the sheet material. The upper position is set to expand the grinding range relative to the original position of the R-axis unit 4. This switching is performed by the control device 10 controlling the Z-axis movement means 7. The Z-axis movement means 7 is provided on the frame of the cutting head 3 and includes a sliding plate 7a, a ball screw mechanism 7b, and a motor 7c. The sliding plate 7a supports the R-axis unit 4 and is guided by a guide mechanism provided on the frame of the cutting head 3 so that it slides up and down. However, the guide mechanism is not shown in the figure. The ball screw mechanism 7b drives the sliding plate 7a to move up and down. The motor 7c drives the ball screw of the ball screw mechanism 7b to rotate. The lifting mechanism 6 is a pneumatic cylinder or the like, and is attached to the R-axis unit 4 to lift and lower the reciprocating unit 5. However, the lifting mechanism 6 may also be attached to the sliding plate 7a. Even if the position of the R-axis unit 4 is switched by the Z-axis moving means 7 between the origin position and an upper position set above the origin position, the reciprocating unit 5 is held in the regulated position by the stopper, which is the regulating means 9, and the cutting blade sharpening mechanism 8 rises relatively, expanding the sharpening range of the upright cutting blade 2.

[0023] FIG. 2 shows the operation of the cutting machine 1 in FIG. 1, including changing the origin position according to the thickness of the stack of sheet material 20, using the upright cutting blade 2, R-axis unit 4, reciprocating unit 5, cutting blade sharpening mechanism 8, and fabric presser 11; other components are not shown. The sheet material 20 to be cut is placed on the cutting table 12 of the cutting machine 1. The surface of the cutting table 12 is horizontal and made of elastic brushes, so that even when the upright cutting blade 2 enters during cutting, the brushes partially tilt, making them less likely to be cut. Various materials, such as fabrics and industrial materials, can be used for the sheet material 20, and efficiency can be improved by stacking multiple sheets and cutting them.

[0024] Figure 2(a) shows the state in which the sheet material 20 is stacked to the maximum stack thickness ta. The upright cutting blade 2 for cutting this sheet material 20 with this stack thickness ta must have a blade length that prevents the blade tip from coming off the sheet material 20 even when reciprocated by the reciprocating unit 5. The origin position of the R-axis unit 4 is set to a height equal to the stack thickness ta plus a margin using the Z-axis movement means 7 so that the sheet material 20 with a stack thickness ta can be cut. By switching the R-axis unit 4 to a higher position using the Z-axis movement means 7, the sharpening range required to sharpen the blade length of the upright cutting blade 2 is contained within the expanded sharpening range. Figure 2(b) shows the origin position set for the R-axis unit 4 when the stack thickness tb is approximately 60% of the stack thickness ta. The sharpening range of the upright cutting blade 2 for cutting this stack thickness tb is made smaller than that for a stack thickness ta, thereby shortening the lift amount by the Z-axis movement means 7 from the origin position to the higher position and shortening the switching time. As the origin position is changed, the regulating position of the regulating means 9 is also changed. The regulating means 9, which can change its regulating position, can use a stopper that can control the amount of protrusion and retraction in multiple or continuous steps, or a manually replaceable stopper with different amounts of protrusion and retraction. If there is only one regulating position, a single stopper can be used as the regulating means. Figure 2(c) shows a case where polishing corresponding to the layer thickness tc is possible without switching between the origin position and the upper position. Since the layer thickness tc falls within the polishing range at the origin position, there is no need to expand the polishing range. In this case, no upper position is set and polishing is performed only at the origin position. Since unnecessary areas are not polished, the life of the grinding wheel can be extended.

[0025] Figure 3 shows why overlapping areas occur in the sharpening range of the upright cutting blade 2. Figures 3(a) and 3(b) show the sharpening ranges ga and gb at the upper and home positions, respectively. The cutting blade sharpening mechanism 8 sharpens the upright cutting blade 2 using, for example, two stages of grindstones 18 and 19. The upright cutting blade 2 reciprocates vertically using the reciprocating unit 5, with the upper limit shown on the left and the lower limit shown on the right. The sharpening range of the upper grindstone 18 is indicated by the upper two-dot chain line, and the sharpening range of the lower grindstone 19 is indicated by the lower two-dot chain line. Each sharpening range is the sum of the reciprocating stroke of the reciprocating unit 5 and the width of the grindstones 18 and 19. The sharpening ranges are designed to have overlapping areas da and db. Without these overlapping areas da and db, the areas between the sharpening ranges of the grindstones 18 and 19 would remain unpolished, resulting in uneven polishing. If overlapping portions da and db are provided, there is a risk that the amount of polishing at the overlapping portions da and db will be large. Even when three or more stages of grinding stones are provided, it is necessary to provide overlapping portions. However, if the width of the overlapping portions da and db, which are created when using multiple stages of grinding stones, is smaller than the width of the grinding stones 18 and 19, it is expected that polishing unevenness will not progress too much.

[0026] Figure 3(c) shows the expanded polishing range gc obtained by switching between the upper position and the origin position. The expanded polishing range gc includes a partial overlap dc between the lower part of the polishing range ga at the upper position and the upper part of the polishing range gb at the origin position. This overlap dc is necessary to prevent unpolished areas; it would become larger if the lift distance from the origin position to the upper position were shortened to reduce the polishing range, as shown in Figure 2(b). Even with a single grinding wheel, the overlap dc must be provided. The control device 10 shown in Figure 1 controls the Z-axis moving means 7 to slow the movement speed between the origin position and the upper position in the non-overlapping areas compared to the overlapping areas of the polishing by the cutting blade sharpening mechanism 8, thereby preventing excessive grinding due to overlapping polishing.

[0027] FIG. 4 shows an outline of the control operation of the control device 10 of FIG. 1. When control is initiated, in step s1, the thickness of the stack of sheet material 20 is detected. The stack thickness can be detected by bringing the fabric presser foot 11 into contact with the surface of the sheet material 20 and calculating the height from the surface of the cutting table 12, as in Patent Document 1, for example, and using this as a thickness detection means. The thickness detection can also be performed using a sensor. In step s2, the origin position of the polishing is set based on the detected stack thickness. The origin position is set, for example, at a height that is at least a certain distance from the surface of the sheet material 20. In step s3, based on the stack thickness of the sheet material 20, it is determined whether it is necessary to set an upper position and expand the polishing range. If it is determined necessary, the upper position is set in step s4. During polishing, polishing is performed at the origin position in step s5, and polishing is performed while moving to the upper position in step s6. During the movement, the speed is adjusted for the overlap position dc shown in FIG. 3(c). In the subsequent step s7, polishing is performed at the upper position. If it is determined in step s3 that setting the upper position is not necessary, only sharpening at the origin position in step s8 is performed during sharpening. When sharpening in step s7 or step s8 is completed, control of sharpening of the upright cutting blade 2 is terminated. If sharpening is repeated while cutting the sheet material 20, whether or not setting the upper position is necessary can be stored and control from step s3 onwards can be performed. Furthermore, since the thickness of the stack of sheet material 20 can be determined without detecting it, for example, by placing a ruler against the stack, it is possible to determine whether switching is necessary, input the determination result to the control device 10, and have the control device 10 perform control from step s3 onwards. Note that the order of sharpening at the origin position in step S4 and sharpening at the upper position in step s7 may be reversed. Furthermore, switching between the origin position and the upper position may be repeated not only once but multiple times.

[0028] FIG. 5 shows a schematic diagram of a conventional cutter 31, as compared to the cutter shown in FIG. 1. The cutter 31 uses a dedicated lifting actuator, a pneumatic cylinder 32, described in Patent Document 2, to raise and lower the R-axis unit 4, switching between the origin position shown in FIG. 5(a) and the upper position shown in FIG. 5(b). Furthermore, the use of a Z-axis moving means 7 allows the origin position to be adjusted according to the thickness of the sheet material stack. However, to expand the polishing range, a dedicated lifting actuator, a pneumatic cylinder 32, is required. In the embodiment shown in FIG. 1, the Z-axis moving means 7 combines the function of adjusting the lift amount to the standby state according to the stack thickness, as in Patent Document 1, with the function of expanding the polishing range, thereby eliminating the need for a dedicated lifting actuator and increasing the degree of control flexibility. [Explanation of symbols]

[0029] 1 cutting machine 2 upright cutting blades 3 cutting head 4 R-axis unit 5 Reciprocating Unit 6 Lifting mechanism 7 Z-axis movement means 7a Sliding plate 7b Ball screw mechanism 7c motor 8 Cutting blade sharpening mechanism 9. Regulatory measures 10 Control device 11 Fabric presser 12 Cutting Table 18,19 Whetstone 20 Sheet material

Claims

1. The cutting apparatus includes a cutting table on which a sheet material is placed on a horizontal surface, and a cutting head movable along the surface of the cutting table; The cutting head is an upright cutting blade having a cutting edge extending in a vertical direction perpendicular to the surface of the cutting table, for cutting a sheet material placed on the surface of the cutting table; An R-axis unit that can change the direction of the cutting edge of the upright cutting blade around an R-axis that is parallel to the vertical direction; a reciprocating unit that holds an upright cutting blade and can reciprocate it in the upright direction; an elevation mechanism capable of raising or lowering the reciprocating unit relative to the R-axis unit in the vertical direction within a preset stroke range; a Z-axis moving means for moving the R-axis unit and the lifting mechanism in a Z-axis direction parallel to the up-down direction, The R-axis unit is equipped with a cutting blade sharpening mechanism, The cutting blade sharpening mechanism can sharpen the reciprocating upright cutting blade when not cutting. In a cutting machine equipped with a cutting blade sharpening mechanism, When sharpening the upright cutting blade with the cutting blade sharpening mechanism, Control the lifting mechanism to raise the reciprocating unit, a control device that controls the Z-axis moving means and can switch and raise the R-axis unit between an origin position that is set as a position where the upright cutting blade moves upward from the sheet material and an upper position that is set above the origin position; a restricting means for restricting the position of the reciprocating unit so that it does not rise above a restricting position set above the R-axis unit, even when the R-axis unit is switched so as to rise from the origin position to an upper position by the movement of the Z-axis moving means; A cutting machine equipped with a cutting blade sharpening mechanism, comprising:

2. the origin position is changeable in accordance with the thickness of the sheet material placed on the cutting table; The restricting means is capable of changing the restricting position of the reciprocating unit in accordance with the changed origin position.

2. A cutting machine equipped with the cutting blade sharpening mechanism according to claim 1.

3. a thickness detection means for detecting the thickness of the sheet material; The restricting means is capable of controlling a change of the restricting position, The control device Depending on the thickness of the sheet material detected by the thickness detection means, determining whether or not switching between the origin position and the upper position in the Z-axis moving means is necessary, and if it is determined that switching is not necessary, setting only the origin position, and if it is determined that switching is necessary, setting the origin position and the upper position; controlling the restricting means to make the restricting position of the reciprocating unit correspond to the set origin position; 3. A cutting machine equipped with the cutting blade sharpening mechanism according to claim 2.

4. The upper position is set so that a sharpening range of the upright cutting blade by the cutting blade sharpening mechanism partially overlaps with a sharpening range at the origin position, The control device controls the Z-axis moving means to make the lifting speed between the origin position and the upper position slower in a portion where the sharpening by the cutting blade sharpening mechanism does not overlap than in a portion where the sharpening by the cutting blade sharpening mechanism does overlap. A cutting machine comprising the cutting blade sharpening mechanism according to any one of claims 1 to 3.

5. The cutting apparatus includes a cutting table on which a sheet material is placed on a horizontal surface, and a cutting head movable along the surface of the cutting table; The cutting head is an upright cutting blade having a cutting edge extending in a vertical direction perpendicular to the surface of the cutting table, for cutting a sheet material placed on the surface of the cutting table; An R-axis unit that can change the direction of the cutting edge of the upright cutting blade around an R-axis that is parallel to the vertical direction; A reciprocating unit that holds an upright cutting blade and can move it up and down; an elevation mechanism capable of raising or lowering the reciprocating unit relative to the R-axis unit in the vertical direction within a preset stroke range; a Z-axis moving means for moving the R-axis unit and the lifting mechanism in a Z-axis direction parallel to the up-down direction, The R-axis unit is equipped with a cutting blade sharpening mechanism, The cutting blade sharpening mechanism can sharpen the reciprocating upright cutting blade when not cutting. In a method for sharpening a cutting blade of a cutting machine, A restricting means is provided above the R-axis unit to set a restricting position, The lifting mechanism raises the reciprocating unit, The Z-axis moving means switches the position of the R-axis unit between an origin position where the upright cutting blade is set to be positioned above the sheet material and an upper position set above the origin position; Even when the R-axis unit is switched to rise from the origin position to an upper position by the movement by the Z-axis moving means, the position of the reciprocating unit is fixed by the regulating means so that it does not rise above the regulating position, and the upright cutting blade is sharpened by the cutting blade sharpening mechanism. A method for sharpening a cutting blade of a cutting machine.

Images