Method for obtaining wear level of cutting machine and cutting blade

Abstract

To provide a space-saving cutter.SOLUTION: A cutter that cuts a sheet material by a cutting blade 130 includes: an abrasive belt 220 capable of swinging from a standby position to a position of contacting with a blade tip 131 of the cutting blade 130; a swing angle measurement unit 260 that measures a swing angle D220 of the abrasive belt 220; and a control unit that acquires a degree of wear of the cutting blade 130 on the basis of the measured swing angle D220. The abrasive belt 220 contacts with the blade tip 131 of the cutting blade 130 at a right angle.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a cutting machine capable of acquiring the degree of wear of a cutting blade that cuts sheet material, and a cutting blade wear acquisition method. [Background technology]

[0002] Conventionally, there is known a technique for a cutting machine that can acquire the degree of wear of a cutting blade that cuts a sheet material, as described in Patent Document 1, for example.

[0003] The cutting blade of the cutting machine described in Patent Document 1 is inserted from above into a substantially cylindrical actuation ring, and the cutting edge faces a predetermined direction as the actuation ring rotates around its axis. A detection pin is provided on the actuation ring in a movable manner on the front side of the cutting edge of the cutting blade. In addition, an actuation pin of a blade width detection means is provided on the outside of the actuation ring in a movable manner.

[0004] To obtain the degree of wear of the cutting blade, first rotate the operating ring and position the detection pin so that it faces the operating pin. Next, the linear stepping motor advances the operating pin and detection pin until the detection pin abuts against the cutting edge of the cutting blade. In this way, the position of the cutting edge is detected from the number of drive pulses input to advance the detection pin, and the blade width and therefore the degree of wear of the cutting blade are obtained.

[0005] However, in the above-mentioned cutting machine, the configuration for obtaining the degree of wear is relatively complex, such as moving a detection pin arranged to straddle the outside and inside of a rotating member such as an operating ring together with an operating pin provided on the outside of the operating ring, and therefore requires a relatively large installation space. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 7-60693 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in view of the above circumstances, and the problem to be solved by the present invention is to provide a cutting machine and a method for acquiring the degree of wear of a cutting blade that can save space. [Means for solving the problem]

[0008] The problem to be solved by the present invention is as described above, and the means for solving this problem will now be described.

[0009] In other words, the cutting machine of the present invention is a cutting machine that cuts sheet material with a cutting blade, and is equipped with a swinging unit that can swing from a standby position until it abuts the cutting edge of the cutting blade, a swing angle measuring unit that measures the swing angle of the swinging unit, and a wear degree acquiring unit that acquires the degree of wear of the cutting blade based on the measured swing angle. By configuring in this way, the degree of wear of the cutting blade can be measured with a relatively simple configuration, and space can be saved.

[0010] The swinging portion may also constitute a sharpening device for sharpening the cutting blade. With this configuration, the degree of wear of the cutting blade can be measured using a grinding device that grinds the cutting blade, thereby further saving space.

[0011] The grinding device may also include a grinding belt that is wound around a plurality of pulleys and is configured to be able to contact the cutting blade between the pulleys, and a deflection prevention member that is provided inside the portion of the grinding belt that contacts the cutting blade. By configuring in this way, it is possible to prevent the abrasive belt from flexing, and to improve the accuracy of measuring the degree of wear.

[0012] The polishing apparatus may also include an air cylinder as a drive source, a drive gear arranged coaxially with the oscillation axis of the polishing apparatus, a driven gear arranged on an axis different from the oscillation axis and meshing with the drive gear, and an encoder included in the oscillation angle measuring unit for measuring the rotation angle of the driven gear. This configuration allows the encoder to be easily installed.

[0013] The swinging portion may be adapted to come into contact with the cutting edge of the cutting blade at a right angle. By configuring in this way, the degree of wear of the cutting blade can be measured with high accuracy.

[0014] In addition, the method for obtaining the degree of wear of a cutting blade according to the present invention is a method for obtaining the degree of wear of a cutting blade of a cutting machine that cuts sheet material, and includes a swinging process for swinging a swinging part from a standby position until it abuts the cutting edge of the cutting blade, a measurement process for measuring the swing angle of the swinging part, and a wear degree obtaining process for obtaining the degree of wear of the cutting blade based on the measured swing angle. By configuring in this way, the degree of wear of the cutting blade can be measured with a relatively simple configuration, and space can be saved. [Effects of the Invention]

[0015] The effect of the present invention is that it is possible to save space. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a side view schematically showing a cutting machine according to an embodiment of the present invention; [Figure 2] FIG. 4 is a rear view schematically showing a part of the cutting head. [Figure 3] FIG. 3 is a side view schematically showing a part of the cutting head. [Figure 4] FIG. 3 is a plan view schematically showing a part of the cutting head. [Figure 5] FIG. 1 is a plan view schematically showing a polishing apparatus. [Figure 6]1A is a plan view schematically showing a state in which the cutting blade is rotating, and FIG. 1B is a plan view schematically showing a state in which the cutting blade is being sharpened. [Figure 7] 1A is a plan view schematically showing a state in which the cutting blade is rotating, and FIG. 1B is a plan view schematically showing a state in which the cutting edge of the cutting blade is in contact with an abrasive belt. [Figure 8] FIG. 10 is a plan view schematically showing a state in which an abrasive belt contacts the cutting edge of a worn cutting blade. DETAILED DESCRIPTION OF THE INVENTION

[0017] In the following description, the directions indicated by arrows U, D, F, B, L, and R in the drawings are defined as the upward direction, downward direction, forward direction, backward direction, leftward direction, and rightward direction, respectively. In addition, the cutting machine 1 according to this embodiment transports the sheet material 2 from the rear to the front, so the forward and backward directions correspond to the transport direction.

[0018] First, the overall configuration of a cutting machine 1 according to a first embodiment of the present invention will be described.

[0019] The cutting machine 1 shown in FIG. 1 cuts a sheet material 2 into a desired shape. The sheet material 2 may be a flexible, breathable material such as a woven or knitted fabric, or a resin sheet. The sheet material 2 is cut in a stacked state. Note that the sheet material 2 shown in the following figures is shown in a stacked state. The cutting machine 1 mainly comprises a cutting table 10, a beam moving body 20, an operation unit 30, and a control unit 40.

[0020] The cutting table 10 can transport the sheet material 2 to the cutting area 11 by a belt conveyor 11a. Inside the cutting table 10, a suction device (not shown) that sucks the sheet material 2 on the cutting area 11 is provided.

[0021] Behind the belt conveyor 11a, there is provided a roll loading section 12 on which the sheet material 2 is placed before being conveyed in. In front of the roll loading section 12, there is provided a covering sheet laying device 13 for covering the sheet material 2 with an air-impermeable covering sheet 3. In front of the belt conveyor 11a, there is provided a pickup table (not shown) to which the sheet material 2 is conveyed after being cut.

[0022] The beam moving body 20 comprises a pair of bases 21 provided on both outer sides of the cutting area 11 in a direction perpendicular to the conveying direction, and a beam 22 extending in a direction perpendicular to the conveying direction so as to connect the pair of bases 21. The bases 21 are configured to be movable in the conveying direction by a conveying direction movement mechanism (not shown). The beam 22 supports the cutting head 100 (described later). The cutting head 100 can be moved on the beam 22 by a movement mechanism (not shown).

[0023] The operation unit 30 is used to operate the cutting machine 1. The operation unit 30 includes a keyboard 31 and a mouse 32 that can input various information, and a display 33 that can display various information.

[0024] The control unit 40 is for controlling the operation of the cutting machine 1. The control unit 40 includes an arithmetic processing unit such as a CPU, a storage unit such as a RAM or a ROM, etc. The storage unit of the control unit 40 stores various information, programs, etc. used to control the cutting machine 1.

[0025] The control unit 40 is connected to each of the cutting table 10, the beam moving body 20, and the operation unit 30. The control unit 40 can control the operation of each part of the cutting machine 1 based on a cutting program or the like created in advance. Specifically, the control unit 40 can carry in and out the sheet material 2 (fabric feeding) and perform cutting, etc. by controlling the operation of the belt conveyor 11a and the beam moving body 20. The control unit 40 can display information related to cutting, etc. on the display 33 by communicating with the operation unit 30.

[0026] The configuration of the cutting head 100 will be described below with reference to Figures 1 to 5. As shown in Figure 1, the cutting head 100 includes a base unit 110 that has the movement mechanism and is movable along the beam 22, and a movable unit 120 that is movable relative to the base unit 110. As shown in Figures 2 and 3, the movable unit 120 includes a cutting blade 130, a reciprocating head 140, an R-axis unit 150, a sheet presser 160, and a grinding device 170.

[0027] The cutting blade 130 is disposed with its longitudinal direction facing the vertical direction. As shown in FIGS. 3 and 4, the cutting blade 130 has a cutting edge 131, a ridge 132, and cutting edge side surfaces 133. The cutting edge 131 is formed from the lower end of the cutting blade 130 to the middle between the top and bottom. The ridge 132 is formed on the opposite side of the cutting edge 131 in the direction in which the cutting edge 131 faces. In this embodiment, the distance from the cutting edge 131 to the ridge 132 in the direction in which the cutting edge 131 faces is referred to as the "blade width W130."

[0028] The cutting edge side surface 133 is an inclined surface extending from the cutting edge 131 toward the ridge 132. A pair of cutting edge side surfaces 133 are formed. The pair of cutting edge side surfaces 133 are formed in a tapered shape so that they approach each other as they approach the cutting edge 131.

[0029] 2 and 3 is supported by a lifting mechanism (not shown) so as to be movable up and down relative to the base part 110. A cutting blade 130 is attached to the reciprocating head 140 so as to be angularly displaceable and detachable. Thus, the cutting blade 130 can be raised and lowered relative to the base part 110 in accordance with the raising and lowering of the reciprocating head 140. The cutting blade 130 can move, for example, between a cutting position where it protrudes downward relative to a sheet presser 160 (described later) and a non-cutting position located above the sheet presser 160. The reciprocating head 140 is configured so that the cutting blade 130 can reciprocate at high speed by a drive mechanism (not shown) during cutting.

[0030] The R-axis unit 150 is disposed below the reciprocating head 140, and the cutting blade 130 is inserted from above. The R-axis unit 150 includes a unit main body 151 supported on the base 110 so as to be movable up and down, and a rotating body 152 supported so as to be rotatable relative to the unit main body 151. The rotating body 152 is rotated about the R-axis A150 by power transmitted from a drive source such as a motor (not shown). The cutting blade 130 is rotated about the R-axis A150 in accordance with the rotation of the rotating body 152. This allows the R-axis unit 150 to change the orientation of the cutting edge 131. The R-axis unit 150 can also move relative to the reciprocating head 140.

[0031] The sheet presser 160 is disposed below the R-axis unit 150 and is connected to the R-axis unit 150. The sheet presser 160 is formed so that the cutting blade 130 can pass through it in the vertical direction.

[0032] The cutting head 100 can cut the sheet material 2 by reciprocating the cutting blade 130 while the cutting blade 130 is positioned at the cutting position and moving horizontally while changing the direction of the cutting edge 131 according to a predetermined program.

[0033] The sharpening device 170 shown in FIGS. 2 to 5 sharpens the cutting blade 130. The sharpening device 170 is provided on the unit main body 151 of the R-axis unit 150. The sharpening device 170 is configured to be able to move up and down integrally with the R-axis unit 150 and not rotate in conjunction with the rotation of the rotating body 152. The sharpening device 170 includes a rotating shaft 180, a first member 190, a second member 200, a plurality of pulleys 210, a sharpening belt 220, a deflection prevention member 230, a motor 240, a swing mechanism 250, and a swing angle measurement unit 260. Note that some of the components of the sharpening device 170 are omitted from FIGS. 5 to 7.

[0034] 4 and 5 rotates a drive pulley 211, which will be described later. The rotation shaft 180 is disposed with its axis oriented in the vertical direction. The rotation shaft 180 is provided in the unit main body 151 via a motor 240, which will be described later, and is configured to be rotatable around its axis relative to the R-axis unit 150. The rotation shaft 180 is disposed horizontally spaced apart from the cutting blade 130.

[0035] The first member 190 is provided on the underside of a mounting base 241 (see FIGS. 2 and 3) for mounting a motor 240 (described later). As shown in FIG. 3, the first member 190 includes a first plate portion 191 and a second plate portion 192.

[0036] A pair of upper and lower first plate portions 191 are provided. The rotation shaft 180 shown in FIG. 5 is inserted into the first plate portions 191. The second plate portion 192 is formed to connect the pair of upper and lower first plate portions 191. The first member 190 is configured to be swingable relative to the rotation shaft 180 around the axis of the rotation shaft 180.

[0037] 3 and 5 supports a driven pulley 212, which will be described later. The second member 200 is fixed to the second plate portion 192 of the first member 190 and is formed so as to extend rearward from the second plate portion 192. A pair of second members 200 is provided, one above the other.

[0038] The plurality of pulleys 210 shown in FIG. 5 rotates a grinding belt 220, which will be described later. The plurality of pulleys 210 includes a drive pulley 211 and a driven pulley 212. The drive pulley 211 is fixed to the rotary shaft 180. The drive pulleys 211 are provided as a pair, one above the other. The driven pulley 212 is disposed rearward of the drive pulley 211 with a gap therebetween. The driven pulleys 212 are provided as a pair, one above the other. The pair of upper and lower driven pulleys 212 are rotatably supported by a pair of upper and lower second members 200.

[0039] The abrasive belt 220 shown in FIGS. 3 and 5 abrades the cutting blade 130. The abrasive belt 220 is formed endless. The abrasive belt 220 is provided as a pair of upper and lower belts by being wound around a pair of upper and lower drive pulleys 211 and a pair of upper and lower driven pulleys 212. The abrasive belt 220 swings around the axis of the rotation shaft 180 in association with the swing of the first member 190, and can move toward or away from the cutting blade 130. The abrasive belt 220 of this embodiment can swing between a grinding position (see FIG. 6(b)) where it abuts against the cutting blade 130, and a standby position where it is separated from the cutting blade 130. Note that FIGS. 2 to 5 show the abrasive belt 220 positioned at the standby position.

[0040] The deflection preventing member 230 prevents deflection of the abrasive belt 220. The deflection preventing member 230 is provided on the inside of the portion of the abrasive belt 220 that comes into contact with the cutting blade 130. The deflection preventing member 230 of this embodiment is provided from the vicinity of the driven pulley 212 to the midpoint between the front and rear of the abrasive belt 220. The deflection preventing member 230 fills the gap between the abrasive belt 220 and the second member 200.

[0041] 3 and 4 is a drive source for rotating the abrasive belt 220. The motor 240 is attached to a mounting base 241. The mounting base 241 is supported by the unit main body 151. The drive shaft of the motor 240 is connected to the rotating shaft 180. The rotation of the rotating shaft 180 causes the drive pulley 211 to rotate, and the rotation of the drive pulley 211 is transmitted to the abrasive belt 220. In this way, the motor 240 can rotate the abrasive belt 220 between the multiple pulleys 210.

[0042] The swinging mechanism 250 swings the polishing belt 220 around the axis of the rotary shaft 180. The swinging mechanism 250 includes a connecting member 251 and an air cylinder 252.

[0043] 4 and 5 connects the first member 190 to an air cylinder 252, which will be described later. The connecting member 251 is rotatably supported by the first plate portion 191 of the first member 190 via a connecting shaft 251a.

[0044] The air cylinder 252 shown in Figures 3 and 4 is a drive source for oscillating the grinding belt 220. The air cylinder 252 includes a main body 252a and a rod 252b. In the standby position, the main body 252a is disposed with its longitudinal ends facing the front and rear, respectively. The rear end of the main body 252a is supported by the unit main body 151 so as to be rotatable around a cylinder rotation axis A252 whose axial direction faces up and down. The main body 252a can rotate relative to the R-axis unit 150. The rod 252b extends forward from the main body 252a. The tip of the rod 252b is fixed to the tip of the connecting member 251.

[0045] When the rod 252b of the air cylinder 252 is extended or retracted, the rear end of the air cylinder 252 and the connecting member 251 rotate, and the first member 190 rotates around the axis of the rotary shaft 180. As the first member 190 rotates, the second member 200, the driven pulley 212, and the sanding belt 220 swing around the axis of the rotary shaft 180. In this way, the swinging mechanism 250 can swing the sanding belt 220 by the extension and contraction of the rod 252b.

[0046] The oscillation angle measuring unit 260 measures the oscillation angle D220 (see FIG. 7(b)) of the polishing belt 220. As shown in FIGS. 2, 4, and 5, the oscillation angle measuring unit 260 includes a drive gear 261, a driven gear 262, and an encoder 263.

[0047] The drive gear 261 rotates in accordance with the swing of the first member 190. The drive gear 261 has a gear portion formed in a fan shape in a plan view. The drive gear 261 is provided coaxially with the rotation shaft 180. The drive gear 261 is fixed to the first plate portion 191. The drive gear 261 is configured to be rotatable relative to the rotation shaft 180 and the R-axis unit 150.

[0048] The driven gear 262 rotates in accordance with the rotation of the drive gear 261. The driven gear 262 is configured by an external gear that meshes with a gear portion of the drive gear 261, and is provided on an axis different from the rotation axis 180. The driven gear 262 is supported by an encoder 263, which will be described later.

[0049] The drive gear 261 and the driven gear 262 may be any gears that mesh with each other and rotate the driven gear 262 in accordance with the rotation of the drive gear 261, and the shapes of the drive gear 261 and the driven gear 262 are not limited to those in this embodiment.

[0050] The encoder 263 is used to measure the rotation angle of the driven gear 262. The encoder 263 is arranged so as to be aligned with the driven gear 262 in the horizontal direction. The encoder 263 is supported by the mounting base 241 of the motor 240. The encoder 263 has a shaft portion 263a. The shaft portion 263a is arranged so that its axial direction faces the vertical direction. The driven gear 262 is fixed to the shaft portion 263a. The encoder 263 can measure the rotation angle of the driven gear 262 based on the rotation of the shaft portion 263a. The encoder 263 is electrically connected to the control unit 40 shown in FIG. 1 and outputs information related to the rotation angle of the driven gear 262 to the control unit 40.

[0051] Here, since components such as the pair of upper and lower drive pulleys 211 and the motor 240 are provided around the rotating shaft 180, it is expected that sufficient space cannot be secured to install the encoder 263. Therefore, in this embodiment, the encoder 263 is provided on an axis different from the rotating shaft 180. This makes it possible to easily secure the installation space for the encoder 263, and to easily install the encoder 263.

[0052] The control unit 40 shown in FIG. 1 is configured to be able to acquire the rotation angle of the driven gear 262 based on a signal from the encoder 263. The control unit 40 can calculate the oscillation angle D220 of the abrasive belt 220 by performing arithmetic processing using the acquired rotation angle. The control unit 40 is also configured to be able to acquire the degree of wear of the cutting blade 130 based on the calculation result of the oscillation angle D220. The degree of wear is information that makes it possible to determine the degree of wear of the cutting blade 130. The degree of wear includes first information that indicates the wear of the cutting blade 130 using specific numerical values, and second information that roughly indicates the wear of the cutting blade 130 (for example, divided into several stages). In this embodiment, the control unit 40 acquires the amount of wear of the cutting blade 130 as an example of the first information.

[0053] The amount of wear of the cutting blade 130 indicates, in a specific numerical value, how far the cutting edge 131 has retreated (how close it has come to the ridge 132 side). The procedure by which the control unit 40 acquires the amount of wear will be described later.

[0054] The procedure for sharpening the cutting blade 130 by the sharpening device 170 will be described below with reference to FIG.

[0055] First, as shown in Fig. 6(a), the control unit 40 controls the R-axis unit 150 so that the cutting edge 131 of the cutting blade 130 faces a predetermined direction. Then, the control unit 40 drives the motor 240 and the air cylinder 252. At this time, the air cylinder 252 is driven so that the rod 252b is retracted.

[0056] 6(b), the abrasive belt 220 approaches the cutting blade 130 while circulating between the drive pulley 211 and the driven pulley 212. The air cylinder 252 drives the abrasive belt 220 until it contacts the cutting blade 130. As a result, the abrasive belt 220 circulating around the pulleys 211 and 212 is pressed against one side of the cutting edge side 133. In this state, the control unit 40 raises and lowers the reciprocating head 140 and the cutting blade 130 relative to the R-axis unit 150 and the grinding device 170. As a result, one side of the cutting edge side 133 is ground.

[0057] After one side of the cutting edge side surface 133 has been ground, the control unit 40 extends the rod 252b of the air cylinder 252. As the rod 252b extends, the grinding belt 220 moves away from the cutting blade 130. Thereafter, the control unit 40 controls the R-axis unit 150 to change the orientation of the cutting edge 131 so that the other side of the cutting edge side surface 133 can come into contact with the grinding belt 220.

[0058] After changing the orientation of the cutting edge 131, the control unit 40 sharpens the other side of the cutting edge 133 by performing control similar to that when sharpening one side of the cutting edge 133. In this way, sharpening of the cutting blade 130 is completed, and the cutting edge 130 can be restored to its sharpness.

[0059] Here, as the cutting blade 130 wears, the position of the cutting edge 131 gradually retreats. As a result, the cutting position of the sheet material 2 by the cutting blade 130 retreats from a pre-determined position, which raises concerns about a decrease in cutting accuracy. Therefore, the control unit 40 is configured to acquire the amount of wear of the cutting blade 130 and correct the operation of the cutting head 100 based on the amount of wear. This makes it possible to prevent a decrease in cutting accuracy due to wear of the cutting blade 130. The control unit 40 is also configured to be able to detect when to replace the cutting blade 130 based on the amount of wear of the cutting blade 130.

[0060] 7 and 8, a procedure for acquiring the degree of wear of the cutting blade 130 will be described. In Fig. 8, an unused cutting blade 130 is indicated by a two-dot chain line, and a worn cutting blade 130 is indicated by a solid line.

[0061] 7(a), the control unit 40 controls the R-axis unit 150 to change the orientation of the cutting edge 131 so that the cutting edge 131 can contact the abrasive belt 220. At this time, the control unit 40 rotates the cutting blade 130 by a preset reference angle from an initial position where the cutting edge 131 faces in a preset direction.

[0062] As shown in FIGS. 7(b) and 8, the control unit 40 rotates the cutting blade 130 by a reference angle from the initial position, and then drives the air cylinder 252 to swing the abrasive belt 220 from the standby position toward the cutting blade 130. At this time, the control unit 40 controls the motor 240 so as not to rotate the abrasive belt 220. The abrasive belt 220 is brought into contact with the cutting edge 131 of the cutting blade 130 by the swinging. In this embodiment, the abrasive belt 220 is brought into contact with the upper and lower midpoints of the cutting edge 131. Note that once the abrasive belt 220 abuts against the cutting edge 131, further swinging of the abrasive belt 220 is restricted. Thus, the swing angle D220 in this embodiment refers to the angle at which the abrasive belt 220, which is located in the standby position, swings to the position where the swinging is restricted as described above.

[0063] The drive gear 261 rotates in accordance with the oscillation of the abrasive belt 220. The driven gear 262 rotates in accordance with the rotation of the drive gear 261. The encoder 263 measures the rotation angle of the driven gear 262 and outputs information related to the measurement result to the control unit 40. The control unit 40 calculates the oscillation angle D220 of the abrasive belt 220 based on the information related to the measurement result.

[0064] In this embodiment, the anti-warping member 230 is provided inside the grinding belt 220, which prevents the grinding belt 220 from bending when the grinding belt 220 comes into contact with the cutting edge 131. This prevents a change in the oscillation angle D220 due to the bending of the grinding belt 220, and allows the oscillation angle D220 to be calculated with high accuracy.

[0065] After calculating the oscillation angle D220, the control unit 40 calculates the difference between the oscillation angle D220 and the reference oscillation angle. The reference oscillation angle is the oscillation angle of the grinding belt 220 from the standby position until the grinding belt 220 abuts against the cutting edge 131 of the unused cutting blade 130. The control unit 40 of this embodiment stores the reference oscillation angle in advance.

[0066] After calculating the difference between the oscillation angle D220 and the reference oscillation angle, the control unit 40 calculates the wear amount and blade width W130 of the cutting blade 130 based on the calculation result of the difference and the reference blade width. The reference blade width is the blade width W130 of an unused cutting blade 130. The control unit 40 of this embodiment stores the reference blade width in advance.

[0067] In this embodiment, the abrasive belt 220 is brought into contact with the cutting edge 131 at a right angle based on the pre-stored reference angle of the cutting blade 130 and the reference oscillation angle of the abrasive belt 220. When the abrasive belt 220 is brought into contact with the cutting edge 131 at a right angle in this way, the increase in the oscillation angle D220 of the abrasive belt 220 in response to wear of the cutting blade 130 can be made larger compared to when the abrasive belt 220 is not brought into contact at a right angle. This makes it possible to accurately calculate the amount of wear of the cutting blade 130 based on the oscillation angle D220 of the abrasive belt 220.

[0068] After calculating the amount of wear of the cutting blade 130, the control unit 40 corrects the operation of the cutting head 100 based on the calculation result of the amount of wear. This allows the control unit 40 to operate the cutting head 100 appropriately according to the degree of wear of the cutting blade 130, thereby preventing a decrease in the cutting accuracy of the sheet material 2.

[0069] Furthermore, when the control unit 40 calculates the amount of wear of the cutting blade 130, it causes the calculation result of the amount of wear to be displayed on the display 33 of the operation unit 30. The control unit 40 may also cause the calculation result of the blade width W130 to be displayed on the display 33.

[0070] In this embodiment, the degree of wear of the cutting blade 130 can be obtained by using a grinding device 170 for grinding the cutting blade 130. This reduces the installation space required for the equipment required to obtain the amount of wear, thereby saving space. In addition, the number of parts can be reduced, thereby reducing costs.

[0071] 8, if the cutting edge 131 recedes and the cutting edge 131 is always facing a fixed position when the abrasive belt 220 oscillates, the abrasive belt 220 will gradually no longer abut at a right angle against the cutting edge 131 as the cutting blade 130 wears. However, because the deviation in the abutment angle of the abrasive belt 220 against the cutting edge 131 is minute, the control unit 40 can calculate the amount of wear of the cutting blade 130 without any problems.

[0072] In response to this, the control unit 40 may calculate the amount of wear of the cutting blade 130 and then update the reference angle according to the calculation result of the amount of wear. This allows the control unit 40 to correct the deviation of the contact angle of the abrasive belt 220 with respect to the cutting edge 131 that occurs due to wear of the cutting blade 130. This allows the amount of wear of the cutting blade 130 to be calculated with higher accuracy than when the deviation of the contact angle is not corrected.

[0073] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and appropriate modifications are possible within the scope of the technical idea of ​​the invention described in the claims.

[0074] For example, although the grinding device 170 of the present embodiment grinds the cutting blade 130 using the grinding belt 220, the member for grinding the cutting blade 130 is not limited to the grinding belt 220. For example, the grinding device 170 can also grind the cutting blade 130 using a cylindrical grindstone that rotates around the axis of the cylinder. When grinding the cutting blade 130 using a grindstone, the grinding device 170 can press the grindstone against the cutting blade 130 as appropriate depending on the direction of the rotation axis of the grindstone. For example, by orienting the rotation axis of the grindstone in the same direction as the longitudinal direction of the cutting blade 130, the outer circumferential surface of the grindstone can be pressed against the cutting blade 130. Furthermore, by orienting the rotation axis of the grindstone in a direction perpendicular to the longitudinal direction of the cutting blade 130, the side surface of the grindstone (the surface facing the axial direction of the rotation axis) can be pressed against the cutting blade 130. Furthermore, by aligning the cutting edge 131 with the center of the grindstone cylinder, the outer peripheral surface of the grindstone can be brought into contact with the cutting edge 131 at a right angle.

[0075] Although the sanding belt 220 is oscillated by the air cylinder 252 in this embodiment, the drive source for oscillating the sanding belt 220 is not particularly limited. For example, the sanding apparatus 170 can also oscillate the sanding belt 220 by driving the drive shaft of a motor arranged coaxially with the rotation shaft 180. It is also possible to measure the oscillation angle D220 of the sanding belt 220 by using an encoder attached to the motor instead of the encoder 263. It is also possible to measure the oscillation angle D220 of the sanding belt 220 by using a potentiometer attached to the motor instead of the encoder 263. The potentiometer may be provided on a member other than the motor, such as the air cylinder 252.

[0076] In this embodiment, the abrasive belt 220 is brought into contact with the cutting edge 131 at a right angle, but the angle at which the abrasive belt 220 contacts the cutting edge 131 is not particularly limited as long as the degree of wear of the cutting blade 130 can be calculated.

[0077] In addition, in this embodiment, the abrasive belt 220 is brought into contact with the upper and lower midpoints of the cutting edge 131, but the position of the abrasive belt 220 in contact with the cutting edge 131 is not particularly limited. For example, if there is a part of the cutting edge 131 that is prone to wear, the abrasive belt 220 may be brought into contact with that part.

[0078] In this embodiment, the abrasive belt 220 is brought into contact with the cutting edge 131 to obtain the degree of wear, but the member that is brought into contact with the cutting edge 131 is not limited to the abrasive belt 220, and includes various members that can be brought into contact with the cutting edge 131 by swinging. The various members include, for example, the grindstone described above. Furthermore, the various members are not limited to members that grind the cutting blade 130, such as the abrasive belt 220, and may be members that do not grind the cutting blade 130. [Explanation of symbols]

[0079] 1 cutting machine 2 Sheet material 40 Control Unit 130 Cutting blade 131 Cutting edge 220 Abrasive Belt 260 Swing angle measurement unit

Claims

1. In a cutting machine that cuts sheet material with a cutting blade, a swinging unit that can swing from a standby position until it abuts on the cutting edge of the cutting blade; a swing angle measuring unit that measures the swing angle of the swing unit; a wear degree acquiring unit that acquires a wear degree of the cutting blade based on the measured swing angle; A cutting machine comprising:

2. The swinging portion is A sharpening device for sharpening the cutting blade is configured. The cutting machine according to claim 1.

3. The polishing apparatus is an abrasive belt wound around a plurality of pulleys and configured to be able to contact the cutting blade between the pulleys; a deflection preventing member provided inside a portion of the abrasive belt that contacts the cutting blade; Equipped with The cutting machine according to claim 2.

4. The polishing apparatus is An air cylinder as a driving source; a drive gear provided coaxially with the swing shaft of the polishing device; a driven gear provided on an axis different from the swing axis and meshing with the drive gear; an encoder included in the swing angle measurement unit and configured to measure a rotation angle of the driven gear; Equipped with The cutting machine according to claim 2.

5. The swinging portion is It abuts against the cutting edge of the cutting blade at a right angle. The cutting machine according to any one of claims 1 to 4.

6. A method for acquiring a degree of wear of a cutting blade of a cutting machine that cuts a sheet material, comprising: a swinging step of swinging the swinging unit from a standby position until the swinging unit abuts against the cutting edge of the cutting blade; a measuring step of measuring a swing angle of the swing unit; a wear degree acquisition step of acquiring a wear degree of the cutting blade based on the measured swing angle; A method for acquiring the degree of wear of a cutting blade.

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