Cutting circular insert, cutting device, and workpiece cutting method

Abstract

The present invention provides a cutting round insert, wherein a plurality of arc-shaped blade surfaces centered on the center of rotation of a round insert main body are disposed at intervals on the outer peripheral portion of the round insert main body. A non-blade surface portion is disposed between adjacent blade surfaces of the outer peripheral portion of the round blade body. The radially outer end of the non-blade surface portion is positioned radially inward of the radially outer end of the blade surface.

Description

Technical Field

[0001] The present invention relates to a circular cutting blade for peeling off a meat portion from a workpiece such as meat with bone, a cutting device and a workpiece cutting method.

[0002] This application claims priority based on Japanese patent application No. 2022-078115 filed on May 11, 2022, and the contents of the Japanese patent application are incorporated herein. Background Art

[0003] In recent years, the industry has been developing a meat separation device (deboning device) that mechanically separates the meat from the bone of meat with bones such as poultry leg meat.

[0004] This meat peeling device uses a cutting device to make an incision in advance at an appropriate position of the meat of the meat with bone, and uses a meat separator to peel the meat from the bone while raising the clamp holding the end of the bone. The meat separator has a cutting claw that is inserted into the meat incision in a manner that abuts against the outer peripheral surface of the bone of the meat with bone. The meat peeling device can peel the meat from the bone by raising the bone while pushing the cutting claw of the meat separator against the outer peripheral surface of the bone of the meat with bone.

[0005] However, in the case of poultry leg meat, there is a knee joint in the middle of the length direction of the bone part, and a part of the meat part is firmly connected to the knee joint through tendons or fascia. Therefore, in the meat stripping device for processing poultry leg meat, etc., there is a cutter device for cutting the tendons or fascia connecting the meat part and the bone part (for example, refer to Patent Document 1).

[0006] The meat stripping device (deboning device) described in Patent Document 1 includes: a meat separator for stripping meat from bones and a cutter device for cutting tendons or fascia. A rotary circular blade is used in the cutter device. The entire peripheral edge of the circular blade has the same blade surface.

[0007] In fact, when the meat is peeled off from the meat with bones, the cutting claws of the meat separator are brought into contact with the outer peripheral surface of the bone of the meat with bones, and the bone is raised in this state, so that the meat is peeled off to the position where the tendon or fascia of the knee joint is exposed by the meat separator. Then, in this state, the circular blade of the cutter device is brought close to the knee joint, and the tendon or fascia near the knee joint is cut by the circular blade. After that, the bone of the meat with bones is further raised, and the remaining meat is peeled off from the bone by the meat separator.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent No. 5331244 Summary of the invention

[0011] Problems to be solved by the invention

[0012] However, as described above, when the tendon or fascia is exposed by the meat separator, when the tendon or fascia is cut by the circular blade of the cutter device, it is necessary to correctly manage the cutting position of the circular blade in the length direction of the bone part in units of millimeters. If the cutting position of the circular blade is slightly offset from the appropriate position, excess meat will remain on the bone part, so that the yield rate of the meat part as a product is reduced. In addition, depending on the cutting position of the circular blade, perforations may sometimes be generated on the side of the peeled meat part, resulting in a decrease in the quality of the meat part as a product.

[0013] As a countermeasure, a method has been studied in which a rotating circular blade is gently pushed from a direction orthogonal to the length direction onto the outer peripheral surface of the bone part that is relatively moving along the length direction, so as to continuously cut the meat part around the bone part containing tendons or fascia. However, in this case, if the circular blade is continuously rotated to cut the meat part, the blade tip of the circular blade will bite into the cartilage or hard bone of the meat with bones, making it difficult to continue to smoothly cut the meat part. In addition, if the blade tip of the circular blade bites into the cartilage or hard bone of the meat with bones, the residual bone is likely to enter the stripped meat part, or a chipping is likely to occur at the blade tip of the circular blade.

[0014] One aspect of the present invention provides a circular cutting insert, a cutting device, and a method for cutting a workpiece, which are capable of suppressing a cutting edge from biting into a core portion of the workpiece.

[0015] Means for solving problems

[0016] The circular cutting blade, the cutting device, and the method for cutting a workpiece according to the present invention adopt the following structures.

[0017] The circular blade for cutting according to the present invention is characterized in that a plurality of arc-shaped blade surfaces centered on the rotation center of the circular blade body are arranged at intervals on the outer peripheral portion of the circular blade body, and a non-blade surface portion is arranged between adjacent blade surfaces, and the radially outer end of the non-blade surface portion is positioned radially inwardly than the radially outer end of the blade surface.

[0018] According to the above structure, when cutting the meat part of the workpiece, the rotating circular blade body is gently pushed onto the core part of the workpiece such as the bone part with bone meat, and the circular blade body is rotated and driven while the circular blade body is relatively moved along the length direction relative to the core part of the workpiece. At this time, along with the rotation of the circular blade body, the blade face and the non-blade face portion on the periphery of the circular blade body alternately face the workpiece. Thus, when the tip of a part of the blade face is about to bite into the workpiece, the bite is immediately released by the non-blade face portion, and as a result, the tip of the blade can be prevented from biting into the core part of the workpiece.

[0019] The radially outer edge of the non-blade portion is preferably formed in a straight line shape connecting circumferential end portions of the blade tips of the adjacent blade faces.

[0020] In this case, since no concave step portion is formed between the blade surface and the non-blade surface portion, it is less likely that the blade surface will be damaged or the peeled meat portion will be hooked when it contacts the harder portion of the workpiece.

[0021] The cutting device according to the present invention is characterized in that it includes: a tool device having any of the above-mentioned circular cutting blades, a workpiece holding portion for holding a workpiece, a relative movement device for causing the workpiece holding portion and the tool device to move relative to each other in a cutting direction for cutting a meat portion of the workpiece, and a cutting position operating portion for causing the circular cutting blade of the tool device to approach or move away from the workpiece moving relative to the cutting direction from a direction intersecting the cutting direction.

[0022] In the above structure, when the meat part of the workpiece is cut, the workpiece is held on the workpiece holding part, and the workpiece holding part and the tool device are relatively moved in the cutting direction by the relative moving device. In this state, the cutting circular blade of the tool device is rotated, and the cutting circular blade of the tool device is brought close to the cutting part of the workpiece by the cutting position operating part. As a result, the circular blade body of the cutting circular blade is pushed onto the core part of the workpiece, and the meat part of the workpiece is cut by the circular blade body along with the relative movement of the workpiece in the cutting direction. At this time, since the blade surface and the non-blade surface on the outer periphery of the circular blade body alternately face the workpiece, it is possible to prevent the blade tip from biting into the core part of the workpiece.

[0023] The configuration may be such that: the workpiece is meat with bone in which a meat portion is attached to a bone portion, the workpiece holding portion holds the bone portion of the meat with bone, and the cutter device cuts the meat portion of the meat with bone from the bone portion.

[0024] In this case, the operation of cutting the meat from the bone with meat can be reliably achieved, which was previously considered difficult due to the presence of complex joints in the bones and the intricate mixture of cartilage and hard bone in the bones.

[0025] The workpiece cutting method according to the present invention is characterized in that: while rotating any of the above-mentioned circular cutting blades, the workpiece and the circular cutting blade are relatively moved along the cutting direction, and the circular cutting blade is displaced relative to the relatively moving workpiece in a direction intersecting the cutting direction.

[0026] In this case, the cutting circular blade with the blade face and the non-blade face alternately arranged on the outer periphery rotates, and in this state, the cutting circular blade is pressed against the relatively moving workpiece from a direction intersecting the cutting direction. As a result, the cutting edge of the cutting circular blade does not bite into the core part, and the flesh part of the workpiece is easily peeled off from the core part of the workpiece.

[0027] The workpiece may be configured as follows: the workpiece is bone-bound meat with the meat portion attached to the bone portion, and the position of the cutting blade in a direction intersecting the cutting direction is displaced along the outer surface shape of the bone portion relative to the bone-bound meat that moves relatively along the length direction of the bone portion.

[0028] Effects of the Invention

[0029] According to the circular insert for cutting of the present invention, when the circular insert body rotates, the cutting edge and the non-cutting edge portion on the outer periphery of the circular insert body alternately face the workpiece, thereby preventing the cutting edge from biting into the core portion of the workpiece.

[0030] Therefore, when a cutting device or a cutting method using a circular cutting blade according to the present invention is adopted, when the workpiece is meat with bones, in addition to being able to suppress a decrease in the yield of the meat as a product and a decrease in quality such as perforation by smoothly cutting the meat, it is also possible to suppress the mixing of residual bones into the meat or the occurrence of cutting edge defects due to the blade tip biting into the bone. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a front view of the cutting device according to the embodiment of the present invention.

[0032] Figure 2 It is a top view of a plurality of cutter devices according to an embodiment of the present invention.

[0033] Figure 3 It is a top view of the circular cutting insert according to the embodiment of the present invention.

[0034] Figure 4 It is a front view showing the operating state of the cutting device according to the embodiment of the present invention. DETAILED DESCRIPTION

[0035] Hereinafter, embodiments of the present invention will be described based on the drawings. In addition, the materials, shapes, relative arrangements, etc. of the components described in the following embodiments are not limited to the scope of the present invention unless otherwise specified.

[0036] Figure 1 It is a front view of the cutting device 1 of this embodiment. Figure 2 It is a top view of a plurality of cutter devices 12 according to an embodiment of the present invention. Figure 3 It is a top view of the circular cutting insert 15 according to the embodiment of the present invention.

[0037] The cutting device 1 is a device for stripping a meat portion from a workpiece having a meat portion (stripping target portion) around a core portion extending in a longitudinal direction by cutting. As an example, the cutting device 1 is used to strip a meat portion m from a bone portion b of bone-in meat 2 (workpiece) such as poultry leg meat. Hereinafter, as an example of a workpiece, poultry leg meat as bone-in meat 2 is described as an example. In the poultry leg meat (bone-in meat 2), the femur b1 and the tibia b2 are connected by a knee joint b3, and the condyle b4 is connected to the end of the tibia b2.

[0038] Figure 1 The cutting device 1 shown includes: a clamp 10 (workpiece holding portion), a lifting device 11 (relative moving device), a plurality of tool devices 12, and a tool moving device (cutting position operating portion) 100, wherein the clamp 10 makes the bone-in meat 2 face downward and holds the condyle b4 (bone portion b); the lifting device 11 makes the clamp 10 rise and fall; the plurality of tool devices 12 are used to cut and peel off the meat portion m from the bone portion b of the bone-in meat 2 by cooperating with the rising action of the clamp 10; the tool moving device 100 makes the tool device 12 approach or move away (displace the position of the tool device 12) from the horizontal direction (the direction intersecting the cutting direction) to the bone-in meat 2 that moves relatively in the up and down direction (cutting direction). In this embodiment, as Figure 2 As shown, three cutter devices 12 are arranged so as to surround the bone portion b of the bone-with-meat 2 suspended on the jig 10. However, the number of cutter devices 12 to be provided is not limited to three.

[0039] in addition, Figure 1 The cutting device 1 shown is set at a processing station for peeling the meat part m from the bone part b by cutting the meat part m from the bone part b of the bone-bone meat 2. The bone-bone meat 2 is transferred from other processing stations in a state of completing pretreatment. At other processing stations in the previous stage, for example, the meat part m of the circumferential area of ​​the condyle b4 side end of the tibia b2 is cut into, and the meat part m is cut along the length direction of the bone part b (tendon insertion processing) is performed. Between each processing station, a common clamp 10 moves in a state of maintaining the condyle b4 of the bone-bone meat 2.

[0040] The clamp 10 is configured to be able to hold the condyle b4 of the bone-bearing flesh 2 and to release the holding of the condyle b4 of the bone-bearing flesh 2 .

[0041] The lifting device 11 causes the jig 10 holding the bone part b (condyle b4) of the bone-bearing meat 2 to rise at a predetermined speed, thereby causing the bone part b of the bone-bearing meat 2 to move relative to the cutter device 12 in the vertical direction. In the present embodiment, the lifting device 11 causes the bone part b of the bone-bearing meat 2 to rise upward relative to the cutter device 12 whose position in the vertical direction is fixed, thereby enabling the meat part m to be cut by the cutter device 12. In the present embodiment, the lifting device 11 constitutes a relative moving device.

[0042] However, the bone portion b of the bone-bearing meat 2 may be fixed by the clamp 10, and the cutter device 12 may be moved downward. In this case, the device for moving the cutter device 12 downward constitutes a relative moving device.

[0043] The cutter device 12 includes a circular cutting blade 15 that rotates in a horizontal posture, and a driving unit 16 that rotates the circular cutting blade 15. The driving unit 16 of each cutter device 12 is held by a corresponding cutter moving device.

[0044] The tool moving device, for example, has an arm that can rotate in the horizontal direction around a driving axis, and a tool device 12 (drive unit 16) is held at the front end of the arm. Each arm of the tool moving device moves the cutting circular blade 15 of the tool device 12 horizontally from an initial position separated from the bone part b of the meat with bone 2 to a position close to the bone part b (hereinafter referred to as the "close position"). In addition, after the cutting circular blade 15 cuts off the meat part m of the meat with bone 2, the tool moving device moves the cutting circular blade 15 of the tool device 12 horizontally to the initial position separated from the bone part b of the meat with bone 2. The tool moving device includes an actuator such as a cylinder, which is not shown in the figure, and the actuator is used to move the cutting circular blade 15 of the tool device 12 between the initial position and the close position through the arm. A force application mechanism such as a spring member is provided on either side of the actuator and the arm, and the force application mechanism is used to apply force to the tool device 12 toward the outer peripheral surface direction of the bone part b of the meat with bone 2.

[0045] When the three cutter devices 12 are moved to the approaching position by the cutter moving device, the respective circular cutting blades 15 surround the bone portion b of the bone-in meat 2 at equal intervals.

[0046] exist Figure 3In the shown cutting circular blade 15, a plurality of (e.g., four) blade faces 17 in an arc shape with the rotation center o of the circular blade body as the center are arranged at intervals on the outer periphery of the circular blade body, which is connected to the rotation axis of the driving unit 16 at the center. In addition, a non-blade portion 18 is arranged between each adjacent blade face 17 in the outer periphery of the circular blade body. Each blade face 17 is formed so that the ridges of each blade tip are arranged on a circle with a certain radius with the rotation center o as the center. In addition, the blade tip of each blade face 17 is formed to converge toward the radial outer side of the circular blade body, and when the circular blade body is observed from a direction orthogonal to the rotation axis, the ridges of the rotating blade tip are arranged on a straight line.

[0047] In the case of the present embodiment, the blade faces 17 and the non-blade face portions 18 arranged on the outer peripheral portion of the circular blade body are alternately formed in regions having equal angles around the rotation center o.

[0048] In addition, in the non-blade portion 18 formed on the outer peripheral portion of the circular blade body, the radially outer end portion thereof is positioned radially inwardly than the ridgeline portion (the radially outer end portion of the blade face) of the blade tip of the blade face 17. Specifically, the radially outer edge portion of the non-blade portion 18 is formed into a straight line shape formed by connecting the circumferential end portions 17e of the blade tips of the adjacent blade faces 17.

[0049] The cutting circular blade 15 is rotated by the power of the driving unit 16. In this state, when the outer peripheral portion of the circular blade body is pushed from the horizontal direction to the bone portion b of the bone-bearing meat 2 and the meat portion m near it, the blade surface 17 and the non-blade surface 18 of the outer peripheral portion of the circular blade body alternately face the direction of the bone portion b of the bone-bearing meat 2. Therefore, when the circular blade body rotates, the meat portion m is cut by the blade surface 17 and the bone portion b is pushed by the non-blade surface 18 (the bite of the blade surface is released).

[0050] Figure 1 The figure shows the state where the meat portion m around the tibia b2 of the bone-bearing meat 2 is cut by the cutting circular blade 15 of the cutter device 12. Figure 4 The figure shows a state where the flesh portion m between the knee joint b3 and a part of the femur b1 of the bone-bearing flesh 2 is cut by the cutting circular blade 15 of the cutter device 12 . Figure 4 is with Figure 1 The same cutting device 1 is shown in front view.

[0051] exist Figure 4 In the state shown, when the bone-in meat 2 held by the clamp 10 passes through the cutting circular blade 15 of the cutter device 12, the tendons and fascia around the knee joint b3 are continuously cut by the cutting circular blade 15 together with other surrounding meat parts m.

[0052] Next, the details of the cutting process (cutting method) of the bone-in meat 2 by the cutting device 1 will be described.

[0053] The bone-in meat 2 held by the clamp 10 and in the lowered position has completed the cutting process of the meat part m in the circumferential area of ​​the condyle b4 side end of the tibia b2 and the cutting process of the meat part m along the length direction of the bone part b at other processing stations in the previous stage.

[0054] From this state, the clamp 10 is pulled upward by the lifting device 11, and when the cut portion on the end side of the tibia b2 with bone and meat 2 approaches the setting height of the tool device 12, the tool moving device is activated, and the cutting circular blades 15 of the plurality of tool devices 12 are moved to a position close to the bone part b. At this time, the cutting circular blades 15 of each tool device 12 are driven by the driving unit 16 to rotate, and the outer peripheral portion of the circular blade body abuts against the outer peripheral surface of the bone part b through the cutting portion of the meat part m.

[0055] If the bone part b is further raised by the clamp 10 from this state, the meat part m is continuously cut from the outer periphery of the bone part b from the upper side to the lower side by the rotation of the cutting circular blade 15. At this time, since each tool device 12 is elastically urged toward the direction of the bone part b by a force-applying mechanism (not shown), the outer periphery of the cutting circular blade 15 of each tool device 12 follows the shape change of the outer surface of the bone part b and continues to contact the bone part b (the position of the outer periphery of the cutting circular blade 15 of each tool device 12 follows the shape change of the outer surface of the bone part b and is displaced).

[0056] For example, when the vicinity of the knee joint b3 of the bone-bearing meat 2 moves to the cutting circular blade 15 of each tool device 12 due to the rise of the bone part b through the clamp 10, the tendon or fascia connected to the knee joint b3 is continuously cut together with other meat parts m by the rotating cutting circular blade 15. Since the knee joint b3 is a part where the outer surface shape is intricate and cartilage and hard bone are mixed, the tip of the blade surface of the rotating cutting circular blade 15 is easy to bite into the cartilage or hard bone of the knee joint b3. However, since the arc-shaped blade surface 17 and the non-blade surface 18 whose radial end is positioned closer to the inside than the blade surface 17 are alternately arranged on the outer peripheral portion of the circular blade body of the cutting circular blade 15, the biting of the blade surface 17 relative to the cartilage or hard bone can be suppressed by the non-blade surface 18.

[0057] In this way, when the upper end portion of the femur b1 of the bone-in meat 2 rises to the height position of the cutting circular blades 15 of each cutter device 12, the cutting of the meat portion m by the cutting circular blades 15 is completed at this point in time.

[0058] As described above, when the circular blade body rotates, the cutting circular blade 15 of the present embodiment can suppress the cutting edge from biting into the bone portion b (core portion) of the bone-bearing meat 2 because the blade face 17 and the non-blade face portion 18 on the outer periphery of the circular blade body alternately face the bone-bearing meat 2 (workpiece). In particular, the cutting circular blade 15 of the present embodiment is positioned radially inwardly relative to the ridgeline portion (radial outer end of the blade face) of the blade tip of the adjacent blade face 17 because the radially outer end of the non-blade face portion 18 is positioned radially inwardly relative to the ridgeline portion (radial outer end of the blade face) of the blade tip of the adjacent blade face 17. Therefore, at the terminal portion of the rotation direction of each blade face 17, the biting of the blade face 17 relative to the bone portion b can be quickly released.

[0059] Therefore, when the cutting circular blade 15 of this embodiment is used, the reduction in the yield of the meat part m as a product and the reduction in quality such as perforation can be suppressed by smoothly cutting the meat part m, and the mixing of residual bones into the meat part m or the occurrence of defects on the blade tip caused by the blade tip biting into the bone part b can be suppressed.

[0060] In addition, in the cutting circular blade 15 of the present embodiment, the radially outer edge of the non-edge surface 18 is formed into a straight line shape formed by connecting the circumferential end 17e of the blade tip of the adjacent blade face 17. Therefore, on the outer periphery of the circular blade body, a concave step portion will not be formed between the blade face 17 and the non-edge surface 18. Therefore, when this structure is adopted, when the circular blade body rotates, even if the starting end or the terminal end of the rotation direction of the blade face 17 contacts the hard part or the sharp part of the bone part, it is not easy to produce a defect on the blade face 17.

[0061] In addition, in the case of this structure, since there is no concave step portion formed between the blade surface 17 and the non-blade surface portion 18, when the meat portion m is cut by the cutting circular blade 15, the pieces of the peeled meat portion m are not easily hooked on the starting end portion or the terminal end portion in the rotation direction of the blade surface 17. As a result, the cutting of the meat portion m is not hindered by the accumulation of meat pieces on the cutting circular blade 15, and the peeling of the meat portion m can be smoothly continued.

[0062] In addition, in the cutting device 1 of the present embodiment, the tool moving device 100 as the cutting position operating unit includes a force applying mechanism such as a spring member, which applies force to the cutting circular blade 15 of the tool device 12 in the direction of the bone portion b of the bone-bearing meat 2. Therefore, when cutting the bone-bearing meat 2, the outer peripheral portion of the cutting circular blade 15 can be elastically pressed against the outer peripheral surface of the bone portion b by a moderate force, so that the cutting circular blade 15 smoothly follows the outer surface shape of the bone portion b. The position of the outer peripheral portion of the cutting circular blade 15 of each tool device 12 can be displaced to follow the shape change of the outer surface of the bone portion b.

[0063] Therefore, when the cutting device 1 of this embodiment is used, the yield rate of the peeled meat part m as a product can be further improved.

[0064] The use of the cutting circular blade 15 of this embodiment is not limited to the cutting of bone-in meat 2, and can be used for cutting various workpieces as long as there is a meat part (not limited to edible meat) around a core part having a higher hardness than other parts.

[0065] However, as shown in the present embodiment, when the cutting circular blade 15 is used to cut the meat part m of the bone-carrying meat 2, it is possible to reliably cut the meat part m from the bone part b, which was previously considered difficult due to the presence of complex joints of the bone part b such as the knee joint b3 and the intricate mixing of cartilage and hard bone in the bone part b.

[0066] In addition, the present invention is not limited to the above-mentioned embodiment, and various design changes can be made without departing from the scope of the present invention.

[0067] For example, in the above-mentioned embodiment, the radially outer edge of the non-blade portion 18 of the circular blade body is formed into a straight line shape formed by connecting the end 17e of the blade tip circumferential direction of the adjacent blade surface 17, but the shape of the radially outer edge of the non-blade portion 18 is not limited to this shape. The shape of the radially outer edge of the non-blade portion 18 can also be a non-linear shape including a curved portion or the like in at least a portion.

[0068] However, when the radially outer edge of the non-blade portion 18 is non-linear, its shape is preferably a shape that does not exceed the shape of the area between the straight line connecting the circumferential end 17e of the blade tip of the adjacent blade face 17 and the imaginary circle passing through the blade tip of the blade face 17. In this case, it is particularly advantageous from the viewpoint of maintaining the strength of the blade face 17 and preventing the meat slice from being caught.

[0069] Description of Reference Numerals

[0070] 1…cutting device;

[0071] 2…meat with bones (workpiece);

[0072] 10...Clamp (workpiece holding part);

[0073] 11...Lifting device (relative moving device);

[0074] 12... tool device;

[0075] 15...Circular blade for cutting;

[0076] 17... blade surface;

[0077] 18…non-blade face;

[0078] 100 ... tool moving device (cutting position operating unit).

Claims

1. A circular blade for cutting, characterized in that: A plurality of blade faces in an arc shape centered at the rotation center of the circular blade body are arranged at intervals on the outer periphery of the circular blade body, and a non-blade portion is arranged between adjacent blade faces. A radially outer end portion of the non-blade portion is positioned radially inwardly of a radially outer end portion of the blade surface.

2. The circular cutting blade according to claim 1, characterized in that: The radially outer edge of the non-blade portion is formed in a straight line shape connecting the circumferential ends of the blade tips of the adjacent blade faces.

3. A cutting device, characterized in that: include: A tool device having a circular cutting blade according to claim 1 or 2; A workpiece holding portion, used for holding a workpiece; A relative moving device is used to make the workpiece holding portion and the tool device move relative to each other in a cutting direction for cutting the meat portion of the workpiece; as well as The cutting position operation unit moves the circular cutting blade of the tool device toward or away from the workpiece moving relatively in the cutting direction from a direction intersecting the cutting direction.

4. The cutting device according to claim 3, characterized in that: The workpiece is bone-in meat with the meat portion attached to the bone portion, The workpiece holding portion is used to hold the bone portion of the bone-in meat. The knife device cuts the meat portion of the bone-in meat from the bone portion.

5. A method for cutting a workpiece, characterized in that: The circular cutting blade according to claim 1 or 2 is rotated while the workpiece and the circular cutting blade are relatively moved in a cutting direction. The circular cutting blade is displaced relative to the relatively moving workpiece in a direction intersecting the cutting direction.

6. The method for cutting a workpiece according to claim 5, wherein: The workpiece is bone-in meat with the meat portion attached to the bone portion, The position of the cutting blade in a direction intersecting the cutting direction is displaced along the outer surface shape of the bone portion relative to the bone-bearing meat that is relatively moved along the length direction of the bone portion.

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