Cutting machine provided with cutting blade grinding mechanism and cutting blade grinding method for cutting machine

Abstract

A cutting machine (1) provided with a cutting knife grinding mechanism (8) and a cutting knife grinding method of the cutting machine (1) can expand the grinding range of the upright cutting knife without a dedicated lifting action executor. The switching of the original position and the upper position of the R-axis unit (4) is performed by the control device (10) controlling the Z-axis moving assembly (7). The lifting mechanism (6) is an air pressure cylinder or the like installed on the R-axis unit (4) and capable of lifting the reciprocating motion unit (5). Even if the R-axis unit (4) is switched between the original position and the upper position, the reciprocating motion unit (5) is stopped at the limiting position by the limiter as the limiting assembly (9), the cutting knife grinding mechanism (8) is relatively raised, and the grinding range of the upright cutting knife (2) is expanded.

Description

Technical Field

[0001] This invention relates to a cutting machine having a cutting blade grinding mechanism capable of grinding the cutting blade, and a method for grinding the cutting blade of the cutting machine. Background Technology

[0002] Conventional sheet cutting machines have a cutting table for holding the sheet and a cutting head. The cutting head can move along the surface of the cutting table and is equipped with a cutting blade for cutting the sheet placed on the cutting table. When the cutting blade is a vertical cutting blade that moves up and down repeatedly while cutting the sheet in a piercing manner, the cutting head also has a reciprocating motion unit for the cutting blade 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 vertical cutting blade about the R-axis in the up-down direction.

[0003] The cutting machines described in Patent Documents 1 and 2 raise the upright cutting blade from its embedded state to a standby state where it does not cut the sheet. While the upright cutting blade moves up and down using a reciprocating motion unit, a blade grinding mechanism grinds the blade by contacting a grinding stone with the side of the blade. Furthermore, the machines also disclose detecting the sheet thickness and adjusting the rise to the standby state accordingly. The cutting machine in Patent Document 1 uses a Z-axis moving assembly that moves the R-axis unit and the reciprocating motion unit in the Z-axis direction (up and down) to switch between the cutting and standby states. The cutting machine in Patent Document 2 eliminates the Z-axis moving assembly found in Patent Document 1; the R-axis unit is kept at a constant height, and only a lifting actuator that raises and lowers the reciprocating motion unit is used. When the sheet thickness is small, the rise of the reciprocating motion unit by the lifting actuator is limited by a rising limiter activated by a switching actuator to prevent unnecessary rise of the cutting blade.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 7-60686

[0007] Patent Document 2: Japanese Patent Application Publication No. 2019-107756 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] The range of grinding of the upright cutting blade by the cutting blade grinding mechanism in Patent Documents 1 and 2 is determined by the reciprocating motion unit and the cutting blade grinding mechanism itself. However, in Patent Document 2... Figure 5The document describes an embodiment in which the grinding range is expanded by switching the action of a rising limiter. Furthermore, paragraph 0039 states, "Conventionally, such range expansion was achieved by...using a dedicated actuator. In this embodiment, the switching actuator 12 can also be used." Here, "conventionally" refers to Patent Document 1, etc. Additionally, "dedicated actuator" is used in this application. Figure 5 The structure described later is designed to switch the grinding range settings by raising and lowering the R-axis unit.

[0010] In a vertical cutting blade, the length of the blade's leading edge extending in the vertical direction is the length plus a margin on the maximum stack thickness of the sheet that can be cut. If the stack thickness increases, the vertical cutting blade required for cutting must also be a vertical cutting blade with a longer leading edge, and the required grinding range also increases. However, the grinding range is also limited by the width of the grinding stone and the stroke of the vertical movement performed by the reciprocating motion unit. For the range that becomes insufficient due to the limitations of the grinding range, it is necessary to expand the grinding range by switching. However, the expansion of the grinding range using the lifting and lowering of the reciprocating motion unit performed by the lifting actuator, as in Patent Document 2, has a fixed acceleration and speed for lifting and lowering, lacking controllable degrees of freedom. In addition, in Patent Document 1, a dedicated actuator for lifting and lowering the R-axis unit is required to expand the grinding range.

[0011] The purpose of this invention is to provide a cutting machine with a cutting blade grinding mechanism and a method for grinding the cutting blade of the cutting machine. It has a degree of freedom of control, does not require a dedicated actuator for raising and lowering the R-axis unit, and can expand the grinding range of the upright cutting blade.

[0012] The means to solve the problem

[0013] This invention relates to a cutting machine equipped with a cutting blade grinding mechanism. It includes a cutting worktable for placing sheet material on a horizontal surface and a cutting head movable within the horizontal plane. The cutting head comprises an upright cutting blade, an R-axis unit, a reciprocating motion unit, a lifting mechanism, and a Z-axis moving assembly. The upright cutting blade cuts the sheet material placed on the cutting worktable using its leading edge extending in the vertical direction. The R-axis unit can change the orientation of the leading edge of the upright cutting blade about an R-axis perpendicular to the surface of the cutting worktable. The reciprocating motion unit holds the upright cutting blade and can also reciprocate it in the vertical direction. The lifting mechanism supports the reciprocating motion unit and can raise or lower it within a preset travel range. The Z-axis moving assembly moves the R-axis unit and the lifting mechanism vertically. The cutting machine, which moves along the Z-axis and has an R-axis unit equipped with a cutting blade grinding mechanism that grinds a reciprocating upright cutting blade, is characterized by including a control device and a limiting component. The control device controls a lifting mechanism to raise and lower the reciprocating motion unit during the grinding of the upright cutting blade by the cutting blade grinding mechanism; and controls the Z-axis moving component to switch the R-axis unit to an origin position set as the position for pulling the upright cutting blade upward from the sheet and an upper position set above the origin position to raise it. The limiting component keeps the reciprocating motion unit in the limiting position even when the R-axis unit is switched between the origin position and the upper position by the movement of the Z-axis moving component.

[0014] Furthermore, in this invention, the origin position can be changed in correspondence with the thickness of the sheet placed on the cutting worktable, and the limiting component can change the limiting position of the reciprocating motion unit in correspondence with the changed origin position.

[0015] Furthermore, the present invention is characterized by including a thickness detection component for detecting the thickness of the sheet material, the limiting component being able to control the change of the limiting position, the control device determining, in accordance with the thickness of the sheet material detected by the thickness detection component, whether the switching of the origin position and the upper position by the Z-axis movement component is required; if it is determined that no switching is required, only the origin position is set; if it is determined that a switching is required, both the origin position and the upper position are set; and the control device controls the limiting component to make the limiting position of the reciprocating motion unit correspond to the set origin position.

[0016] Furthermore, in this invention, the upper position is characterized in that the grinding range of the upright cutting blade performed by the cutting blade grinding mechanism partially overlaps with the grinding range at the origin position, and the control device controls the Z-axis movement assembly so that the lifting speed between the origin position and the upper position is lower than the non-repeating portion of the grinding performed by the cutting blade grinding mechanism.

[0017] Furthermore, the present invention provides a method for grinding the cutting blade of a cutting machine. The cutting machine includes a cutting worktable on which sheet material is placed on a horizontal surface and a cutting head movable within the horizontal plane. The cutting head includes a vertical cutting blade, an R-axis unit, a reciprocating motion unit, a lifting mechanism, and a Z-axis moving assembly. The vertical cutting blade cuts the sheet material placed on the cutting worktable using its leading edge extending in the vertical direction. The R-axis unit can change the orientation of the leading edge of the vertical cutting blade about an R-axis perpendicular to the surface of the cutting worktable. The reciprocating motion unit holds the vertical cutting blade and can also reciprocate it in the vertical direction. The lifting mechanism supports the reciprocating motion unit and can raise or lower it within a pre-set travel range. The Z-axis moving assembly... The axis moving assembly moves the R-axis unit and the lifting mechanism in the vertical Z-axis direction. The R-axis unit has a cutting blade grinding mechanism that can grind the reciprocating vertical cutting blade. The cutting blade grinding method of this cutting machine is characterized in that the lifting mechanism raises the reciprocating motion unit, and the Z-axis moving assembly switches the position of the R-axis unit to an origin position set as the position for pulling the vertical cutting blade upward from the sheet and an upper position set above the origin position. Even if the R-axis unit is switched between the origin position and the upper position by the movement of the Z-axis moving assembly, the upward movement of the reciprocating motion unit is stopped at a limited position and the cutting blade grinding mechanism grinds the vertical cutting blade.

[0018] The effects of the invention

[0019] According to the present invention, even when the R-axis unit is switched between the origin position and the upper position by the movement of the Z-axis moving component, the position of the reciprocating motion unit is kept at the restricted position by the limiting component. The grinding range of the upright cutting blade hanging from the restricted position of the reciprocating motion unit can be expanded by the relative movement of the R-axis unit equipped with the cutting blade grinding mechanism. Since the expansion of the grinding range does not require the use of a dedicated lifting actuator to raise and lower the R-axis unit, but is performed by the movement of the Z-axis moving component, the degree of freedom of control can also be increased.

[0020] Furthermore, according to the present invention, even if the origin position is set appropriately in relation to the thickness of the sheet, the upright cutting blade can be efficiently ground within the changed grinding range by changing the position of the reciprocating motion unit restricted by the limiting component.

[0021] Furthermore, according to the present invention, the thickness of the sheet can be detected, and it can be determined accordingly whether the grinding range of the upright cutting blade needs to be expanded by switching between the origin position and the upper position, and grinding is performed within an appropriate grinding range according to the thickness.

[0022] Furthermore, according to the present invention, by moving the R-axis unit through the Z-axis moving assembly for expanding the grinding range, a repetitive grinding portion is generated within the grinding range of the upright cutting blade. Since the movement speed of the non-repetitive portion is lower than that of the repetitive portion during movement, it is possible to adjust to prevent excessive cutting due to repetitive grinding.

[0023] Furthermore, according to the present invention, even without using a dedicated lifting actuator for raising and lowering the R-axis unit, the grinding range of the upright cutting blade can be expanded by the movement of the Z-axis moving assembly of the R-axis unit equipped with the cutting blade grinding mechanism. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the switching between the origin position and the upper position in a cutting machine 1, which is an embodiment of the present invention, to expand the grinding range of the upright cutting blade 2.

[0025] Figure 2 Is Figure 1 The embodiment includes a simplified cross-sectional view of the cut head 3, which includes a change in the origin position corresponding to the stacking thickness of the sheet 20.

[0026] Figure 3 This is a partial front view explaining the reason for the repeated grinding within the grinding range of the upright cutting blade 2.

[0027] Figure 4 It is a general representation in Figure 1 The flowchart of the control actions in the embodiment is shown.

[0028] Figure 5 It is a schematic representation relative to Figure 1 A block diagram of a previous example. Detailed Implementation

[0029] In order to implement the invention

[0030] under, Figures 1-4 The structure and operation of the cutting machine 1, as an embodiment of the present invention, are shown. Additionally, Figure 5 Indicates and Figure 1 Related precedents: In corresponding parts of various figures, there are instances where the same reference symbols are used to indicate the same parts, and redundant explanations are omitted. Furthermore, for ease of explanation, parts not shown in the figure being explained are sometimes referred to using reference symbols found in other figures.

[0031] Example

[0032] Figure 1This diagram schematically illustrates the structure of a cutting machine 1, an embodiment of the present invention, and the actions related to the grinding of the upright cutting blade 2. The cutting machine 1, used for cutting sheet material, has a cutting table for holding the sheet and a cutting head 3, but the sheet and cutting table are not shown in this figure. Furthermore, 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 of the surface of the cutting table, and carries an upright cutting blade 2 for cutting the sheet material placed on the cutting table. The upright cutting blade 2 inserts its lower tip into the sheet material, so that the continuous leading edge of the blade from the tip upwards on the right side of the figure contacts the sheet material, cutting the sheet material while repeatedly moving up and down. The cutting head 3 also includes an R-axis unit 4 and a reciprocating motion unit 5. The R-axis unit 4, located at the lower part of the cutting head 3, changes the orientation of the leading edge of the upright cutting blade 2 around an R-axis perpendicular to the surface of the cutting table, thus changing the cutting direction. A reciprocating motion unit 5, located at the upper part of the cutting head 3, holds the upper part of the upright cutting blade 2, allowing the continuous blade length from the blade tip to the leading edge to hang down, causing the upright cutting blade 2 to reciprocate up and down. The cutting head 3 is equipped with a lifting mechanism 6, which switches between a standby state where the reciprocating motion unit 5 is raised relative to the R-axis unit 4 without cutting sheet material by the upright cutting blade 2, and a state where the reciprocating motion unit 5 is lowered and ready to cut. The lifting mechanism 6 supports the reciprocating motion unit 5 and can rise or fall within a preset travel range. The cutting head 3 includes a Z-axis moving assembly 7 that moves the lifting mechanism 6 and the R-axis unit 4 in the Z-axis direction relative to the cutting table; and a cutting blade grinding mechanism 8 for grinding the upright cutting blade 2 in the standby state. The grinding of the upright cutting blade 2 by the cutting blade grinding mechanism 8 is performed while the reciprocating motion unit 5 moves the upright cutting blade 2 up and down. Additionally, the cutting head 3 is equipped with a limiting component 9 for expanding the grinding range. The cutting machine 1 has a control device 10 for controlling the cutting and grinding. A fabric pressing member 11 that can be placed on the surface of a sheet is provided at the lower part of the cutting head 3.

[0033] The cutting blade sharpening mechanism 8 includes a whetstone, which is built into the R-axis unit 4 and sharpens the blade by contacting the surface from the leading edge of the upright cutting blade 2 to its inclined side. Through sharpening, the sharpness of the leading edge is restored, but the tooth width from the leading edge becomes shorter. The whetstone can be a drum type (sharpening with a cylindrical outer circumference), a disc type (sharpening with a disc-shaped surface), or a belt type (sharpening with a surrounding belt surface). Because these whetstones sharpen the area in contact with the upright cutting blade 2, even if the upright cutting blade 2 is moved up and down by the reciprocating motion unit 5 while sharpening, only a certain area can be sharpened.

[0034] In this embodiment, in order to expand the grinding range, the position of the R-axis unit 4 during grinding is switched to... Figure 1 (a) shows the origin position and Figure 1 (b) The upper position is used for grinding. The origin position is set as the position where the upright cutting blade 2 is pulled upward from the sheet. At the origin position, even if the upright cutting blade 2 repeatedly moves up and down by the reciprocating motion unit 5, it avoids the height at which the blade tip does not pierce the sheet. Preferably, at the origin position, the fabric pressing member 11 is also raised so that it leaves the surface of the sheet. The upper position is set to expand the grinding range relative to the origin position of the R-axis unit 4. This switching is performed by the control device 10 controlling the Z-axis movement assembly 7. The Z-axis movement assembly 7 is equipped 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 equipped on the frame of the cutting head 3 so as to slide in the vertical direction. However, the guide mechanism is omitted from the illustration. The ball screw mechanism 7b drives the sliding plate 7a to move up and down. The motor 7c rotates and drives the ball screw of the ball screw mechanism 7b. The lifting mechanism 6, such as an air pressure cylinder, is mounted on the R-axis unit 4 and enables the reciprocating motion unit 5 to rise and fall. However, the lifting mechanism 6 can also be mounted on the sliding plate 7a. Even if the Z-axis moving component 7 switches the position of the R-axis unit 4 to the origin position and the upper position set above the origin position, the reciprocating motion unit 5 is stopped in the limiting position by the limiter, which is the limiting component 9, and the cutting blade grinding mechanism 8 rises relative to it, thus expanding the grinding range of the upright cutting blade 2.

[0035] Figure 2 The components are represented by a vertical cutting blade 2, an R-axis unit 4, a reciprocating motion unit 5, a cutting blade grinding mechanism 8, and a fabric pressing component 11. Figure 1 The cutting machine 1 includes actions such as changing the origin position corresponding to the stacking thickness of the sheet 20; other structural details are omitted. The sheet 20, which is to be cut, is placed on the cutting worktable 12 of the cutting machine 1. The surface of the cutting worktable 12 is horizontal and formed by a flexible brush. Even when the upright cutting blade 2 enters, the brush partially falls, making it difficult to cut. The sheet 20 can be made of various materials such as cloth and industrial materials, and can be cut by stacking multiple sheets, which improves efficiency.

[0036] Figure 2(a) indicates a state where sheet 20 is stacked at its maximum stack thickness ta. The upright cutting blade 2, used to cut this stack thickness ta of sheet 20, needs to have a blade length that does not detach from the sheet 20 even during the reciprocating movement of the blade tip and leading edge by the reciprocating motion unit 5. The origin position of the R-axis unit 4 is set by the Z-axis movement component 7 to a height with a margin added to the stack thickness ta, so that sheet 20 with a stack thickness ta can be cut. By switching the R-axis unit 4 to an upward position via the Z-axis movement component 7, the grinding range required for grinding the blade length of this upright cutting blade 2 is included within an expanded grinding range. Figure 2 (b) indicates that the origin position on the R-axis unit 4 is set to a stack thickness tb that is approximately 60% of the stack thickness ta. The grinding range of the upright cutting blade 2, which cuts this stack thickness tb, is smaller compared to the case of stack thickness ta, allowing for a shorter rise and fall from the origin position to the next position via the Z-axis movement component 7, thus reducing the switching time. Along with the change in the origin position, the limiting position set by the limiting component 9 also changes. The limiting component 9, which allows for changing the limiting position, can use a limiter that controls the amount of penetration in multiple increments or steplessly, or a limiter with different penetration amounts that can be manually replaced. If the limiting position is a single location, a single limiter can be used as the limiting component. Figure 2 (c) indicates a case where grinding corresponding to the stack thickness tc can be performed even without switching the origin and upper positions. Since the stack thickness tc is within the grinding range at the origin position, it is not necessary to expand the grinding range. In this case, the upper position is not set, and grinding is performed only at the origin position. Since grinding in unnecessary areas is also avoided, the life of the grinding stone can be extended.

[0037] Figure 3 This explains why repeated grinding occurs within the grinding range of the upright cutting blade 2. Figure 3 (a) and Figure 3(b) These represent the grinding ranges ga and gb at the upper position and the origin position, respectively. The cutting blade grinding mechanism 8, for example, grinds the upright cutting blade 2 using two layers of grinding stones 18 and 19. The upright cutting blade 2 moves up and down reciprocally by the reciprocating motion unit 5, with the upper limit indicated on the left and the lower limit on the right, side-by-side. The double-dotted line on the upper side represents the grinding range performed by the upper grinding stone 18, and the double-dotted line on the lower side represents the grinding range performed by the lower grinding stone 19. Each grinding range is the sum of the stroke of the reciprocating motion unit 5 and the width of the grinding stones 18 and 19. Repeated portions da and db are pre-generated within the grinding range. If repeated portions da and db are not generated, the grinding ranges of the respective grinding stones 18 and 19 become un-grinded areas, resulting in uneven grinding. If repeated portions da and db are set, there is a possibility that the grinding amount of the repeated portions da and db will increase. When three or more layers of grinding stones are used, repeated portions also need to be pre-generated. However, if the widths of the repeating portions da and db, which are created for the use of multiple grinding stones, are smaller than the widths of grinding stones 18 and 19, then grinding marks can be expected to develop less.

[0038] Figure 3 (c) represents the expanded grinding range gc, achieved by switching between the upper and origin positions. The expanded grinding range gc includes a partially repeated portion dc, located below the grinding range ga at the upper position and above the grinding range gb at the origin position. This repeated portion dc is necessary to prevent the creation of un-grinded areas, such as... Figure 2 As shown in (b), if the vertical movement from the origin to the upper position is shortened, thus reducing the grinding range, the repeating portion dc increases. Even when the grinding stone is a single layer, the repeating portion dc still needs to be set. Because... Figure 1 The control device 10 shown controls the Z-axis moving assembly 7 so that the moving speed between the origin position and the upper position is low in the non-repetitive part compared with the repetitive part of the grinding performed by the cutting blade grinding mechanism 8, so that it can be adjusted to avoid excessive cutting due to repetitive grinding.

[0039] Figure 4 Briefly Figure 1The control device 10 controls the operation of the sheet 20. If control is started, the stacking thickness of the sheet 20 is detected in step s1. The stacking thickness detection is similar to that in Patent Document 1, for example, by having the fabric pressing member 11 contact the surface of the sheet 20, and calculating the thickness as the height from the surface of the cutting table 12, which is used as a thickness detection component. Thickness detection can also be performed using a sensor. In step s2, the origin position for grinding is set based on the detected stacking thickness. The origin position is set, for example, as a height above a certain distance from the surface of the sheet 20. In step s3, it is determined whether it is necessary to set an upper position to expand the grinding range based on the stacking thickness of the sheet 20. If it is determined that it is necessary, the upper position is set in step s4. During grinding, grinding is performed at the origin position in step s5, and grinding is performed while moving to the upper position in step s6. During the movement, grinding is performed relative to the upper position. Figure 3 (c) shows the speed adjustment of the repeated position dc. In the next step s7, grinding is performed at the upper position. If it is determined in step s3 that the upper position setting is not required, grinding is performed only at the origin position as in step s8. If the grinding in step s7 or step s8 is completed, the control of grinding of the upright cutting blade 2 is terminated. In the case of repeated grinding during the cutting of sheet 20, whether the upper position setting is required is stored in advance, and control is performed in steps s3 and below. In addition, since the layer thickness of sheet 20 can be known by means of measurement, even without detecting the layer thickness, the necessity of switching can be determined, and the determination result is input into the control device 10, so that the control device 10 performs control in steps s3 and below. In addition, the order of grinding at the origin position in step s4 and grinding at the upper position in step s7 can also be interchanged. In addition, the switching between the origin position and the upper position is not just once, but can be repeated multiple times.

[0040] Figure 5 Schematic representation of becoming relative to Figure 1 The conventional cutting machine 31. The cutting machine 31 uses an air pressure cylinder 32, which is a dedicated lifting actuator as described in Patent Document 2, to raise and lower the R-axis unit 4, switching... Figure 5 (a) The origin position and Figure 5 (b) The upper position. Furthermore, due to the use of the Z-axis movement component 7, the origin position can also be adjusted accordingly to the sheet lamination thickness. However, to expand the grinding range, a dedicated lifting actuator, the air pressure cylinder 32, needs to be installed. Figure 1 In the embodiment, the Z-axis moving component 7 combines the functions of changing the rise amount in the standby state corresponding to the stacking thickness, as in Patent Document 1, with the function of expanding the grinding range. It does not require a dedicated lifting actuator and can also increase the degree of freedom of control.

[0041] Explanation of symbols

[0042] 1: Cutting machine; 2: Vertical cutting blade; 3: Cutting head; 4: R-axis unit; 5: Reciprocating motion unit; 6: Lifting mechanism; 7: Z-axis moving assembly; 7a: Sliding plate; 7b: Ball screw mechanism; 7c: Motor; 8: Cutting blade grinding mechanism; 9: Limiting assembly; 10: Control device; 11: Fabric pressing component; 12: Cutting worktable; 18, 19: Grinding stone; 20: Sheet material.

Claims

1. A cutting machine (1) having a cutting blade grinding mechanism (8), comprising a cutting worktable (12) for placing sheet material (20) on a horizontal surface and a cutting head (3) movable along the surface of the cutting worktable. The cutting head (3) includes an upright cutting blade (2), an R-axis unit (4), a reciprocating motion unit (5), a lifting mechanism (6), and a Z-axis moving assembly (7). The upright cutting blade (2) cuts the sheet (20) placed on the surface of the cutting table (12) by the blade tip extending in a vertical direction perpendicular to the surface of the cutting table; The R-axis unit (4) can change the orientation of the leading edge of the upright cutting blade (2) around the R-axis, which is parallel to the vertical direction; The reciprocating motion unit (5) keeps the upright cutting blade (2) and allows it to move back and forth in the vertical direction; The lifting mechanism (6) can cause the reciprocating motion unit (5) to rise or fall in the vertical direction within a preset stroke range relative to the R-axis unit; The Z-axis moving assembly (7) causes the R-axis unit (4) and the lifting mechanism (6) to move in the Z-axis direction, which is parallel to the vertical direction. The R-axis unit (4) is equipped with a cutting blade grinding mechanism (8). The cutting blade grinding mechanism (8) can grind the reciprocating vertical cutting blade (2) when not cutting. The cutting machine (1) equipped with a cutting blade grinding mechanism (8) is characterized by including a control device (10) and a limiting component (9). The control device (10) controls the lifting mechanism (6) to raise the reciprocating motion unit (5) during the grinding of the upright cutting blade (2) by the cutting blade grinding mechanism (8); and controls the Z-axis moving assembly (7) to switch the R-axis unit (4) to the origin position set as the position for pulling the upright cutting blade (2) upward from the sheet (20) and the upper position set above the origin position to raise it. Even if the R-axis unit (4) is switched from the origin position to the upper position by the movement of the Z-axis moving component (7), the position of the reciprocating motion unit (5) will remain in a position that does not rise compared to the limit position set above the R-axis unit.

2. The cutting machine (1) with a cutting blade grinding mechanism (8) as described in claim 1, characterized in that, The aforementioned origin position can be changed in accordance with the thickness of the sheet (20) placed on the aforementioned cutting workbench (12). The aforementioned limiting component (9) can change the aforementioned limiting position of the reciprocating motion unit (5) in accordance with the changed origin position.

3. The cutting machine (1) with a cutting blade grinding mechanism (8) as described in claim 2, characterized in that, Including a thickness detection component for detecting the thickness of the aforementioned sheet (20), The aforementioned limiting component (9) can control the change of the aforementioned limiting position. The control device (10) determines, in accordance with the thickness of the sheet (20) detected by the thickness detection component, whether the switching between the origin position and the upper position by the Z-axis movement component (7) is required. If it is determined that no switching is required, only the origin position is set; if it is determined that switching is required, both the origin position and the upper position are set. The control device (10) controls the limiting component (9) so that the limiting position of the reciprocating motion unit (5) corresponds to the set origin position.

4. The cutting machine (1) with a cutting blade grinding mechanism (8) as described in any one of claims 1 to 3, characterized in that, The aforementioned upper position is set such that the grinding range of the upright cutting blade (2) performed by the aforementioned cutting blade grinding mechanism (8) partially overlaps with the grinding range at the aforementioned origin position. The aforementioned control device (10) controls the aforementioned Z-axis moving assembly (7) so that the lifting speed between the origin position and the upper position becomes low in the non-repetitive part compared to the repetitive part of the grinding performed by the cutting blade grinding mechanism (8).

5. A method for grinding the cutting blade of a cutting machine (1), the cutting machine (1) having a cutting worktable (12) for placing a sheet (20) on a horizontal surface and a cutting head (3) movable along the surface of the cutting worktable. The cutting head (3) includes an upright cutting blade (2), an R-axis unit (4), a reciprocating motion unit (5), a lifting mechanism (6), and a Z-axis moving assembly (7). The upright cutting blade (2) cuts the sheet (20) placed on the surface of the cutting table (12) by the blade tip extending in a vertical direction perpendicular to the surface of the cutting table; The R-axis unit (4) can change the orientation of the leading edge of the upright cutting blade (2) around the R-axis, which is parallel to the vertical direction; The reciprocating motion unit (5) keeps the cutting blade (2) upright and can also make it reciprocate in the up and down direction; The lifting mechanism (6) can cause the reciprocating motion unit (5) to rise or fall in the vertical direction within a preset stroke range relative to the R-axis unit; The Z-axis moving assembly (7) causes the R-axis unit (4) and the lifting mechanism (6) to move in the Z-axis direction, which is parallel to the vertical direction. The R-axis unit (4) is equipped with a cutting blade grinding mechanism (8). The cutting blade grinding mechanism (8) can grind the reciprocating vertical cutting blade (2) when not cutting. The characteristic of the cutting blade grinding method of the cutting machine (1) is that, A limiting component is provided to set the limiting position above the R-axis unit. The reciprocating motion unit (5) is raised by the lifting mechanism (6). The Z-axis moving component (7) switches the position of the R-axis unit (4) to the origin position, which is the position where the upright cutting blade (2) is pulled upward from the sheet (20), and the upper position, which is set above the origin position. Even if the R-axis unit (4) is switched from the origin position to the upper position by the movement of the Z-axis moving component (7), the position of the reciprocating motion unit (5) will be stopped by the limiting component in a way that does not rise compared to the limiting position and the cutting blade grinding mechanism (8) will grind the upright cutting blade (2).

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