Cutting device

Abstract

To provide a cutting device which can cut a cut object near a wall etc. while protecting a cutting blade by a guide plate.SOLUTION: A cutting device 10 includes: a pair of cutting blades 111 which rotates to sandwich and cut a cut object; an electric motor 400 which generates drive force needed for operation of the cutting blades 111; and a guide plate 700 in which a recessed part 710 for storing the cut object is formed so as to retreat along a predetermined direction. An edge of the recessed part 710 includes a pair of straight parts 711 which are parallel to each other and face each other while forming a gap W therebetween. When a position of a leading edge of the guide plate 700 is set as a first position P1 and a position of a leading edge of an operation range of the cutting blade 111 is set as a second position P2, a distance L between the first position P1 and the second position P2 is one-quarter of the gap W or smaller.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an electric cutting device.

Background Art

[0002] As an electric cutting device, for example, the one described in Patent Document 1 below is known. In an electric cutting device, instead of the user's gripping force, the cutting blade is operated by the driving force of an electric motor, and the object to be cut is cut by sandwiching it with a pair of cutting blades. In the cutting device described in Patent Document 1 below, a pair of guide plates are provided so as to sandwich the cutting blade from the outside. The guide plate is formed with a recess for receiving the object to be cut in advance and guiding it to a predetermined position during cutting. When cutting the object to be cut, the cutting blade is operated to close with the object to be cut arranged at the above-mentioned predetermined position.

[0003] By providing such a guide plate, it becomes easy to appropriately set in advance the positional relationship between the object to be cut and the cutting blade before cutting. Also, when the cutting device is in a standby state, the cutting blade can be covered and protected by the guide plate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, for example, when there is a floor or a wall near the object to be cut, the object to be cut may not be able to enter deep enough into the recess of the guide plate, and there may be a case where the object to be cut cannot be cut.

[0006] The present invention aims to provide a cutting device that can cut objects near walls or other structures while protecting the cutting blade with a guide plate. [Means for solving the problem]

[0007] The cutting device according to the present invention is an electrically operated cutting device comprising: a pair of cutting blades that rotate around a central axis of rotation to grip and cut an object to be cut; an electric motor that generates the driving force necessary for the operation of the cutting blades; and a guide plate formed so as to retract along a predetermined direction, in which a recess for accommodating the object to be cut when the object is cut by the pair of cutting blades. The edges of the recess include a pair of straight sections that are parallel to each other and facing each other at a predetermined distance apart. When the position of the guide plate that is furthest forward along the predetermined direction is defined as the first position, and the position of the cutting blades that is furthest forward along the predetermined direction within the operating range of the cutting blades is defined as the second position, in this cutting device, the distance between the first position and the second position along the predetermined direction is 1 / 4 or less of the predetermined distance.

[0008] In the cutting device with the above configuration, the distance between the first position, which is the tip of the guide plate, and the second position, which is the tip of the operating range of the cutting blade, is kept small so as to be 1 / 4 or less of the width of the recess (the predetermined interval mentioned above).

[0009] In most cases, the object to be cut has a diameter approximately equal to the width of the recess. Therefore, with the cutting device configured above, even when the object to be cut is in contact with the floor or wall, the object can be inserted to a position that sufficiently overlaps with the movable range of the cutting blade, and the object can be cut at that position. [Effects of the Invention]

[0010] According to this disclosure, a cutting device is provided that can cut an object to be cut near a wall or the like, while protecting the cutting blade with a guide plate. [Brief explanation of the drawing]

[0011] [Figure 1]Figure 1 shows the configuration of the cutting device according to the first embodiment. [Figure 2] Figure 2 shows the configuration of the guide plate included in the cutting device according to the first embodiment. [Figure 3] Figure 3 shows the configuration of the guide plate included in the cutting device according to the first embodiment. [Figure 4] Figure 4 illustrates the case of cutting an object placed on the floor. [Figure 5] Figure 5 shows the configuration of the guide plate included in the cutting device according to the second embodiment. [Figure 6] Figure 6 shows the configuration of the guide plate included in the cutting device according to the third embodiment. [Modes for carrying out the invention]

[0012] This embodiment will now be described with reference to the attached drawings. To facilitate understanding of the explanation, the same reference numerals are used for identical components in each drawing whenever possible, and redundant explanations are omitted.

[0013] A first embodiment will be described. The cutting device 10 according to this embodiment is an electric cutting device configured for cutting reinforcing bars at construction sites and the like. The configuration of the cutting device 10 will be described mainly with reference to Figure 1. The cutting device 10 comprises a housing 11, a trigger switch 12, a cutting mechanism 100, a ball screw 200, a reduction gear 300, an electric motor 400, a control board 500, and a storage battery 600.

[0014] The housing 11 is a container that encloses the outer shape of the cutting device 10 and is made of, for example, resin. Inside the housing 11 are the ball screw 200 and the reducer 300, which will be described later. In Figure 1, the portion of the housing 11 closest to the viewer has been removed, and the internal structure of the cutting device 10 is shown as a cross-sectional view.

[0015] The trigger switch 12 is a switch operated by the user's finger. The user can turn on the trigger switch 12 by placing a finger on the trigger switch 12 and pulling it in the forward direction. When the user relaxes the finger force, the trigger switch 12 returns to its original position by the force of the spring and becomes off. When the trigger switch 12 is switched between the on state and the off state, a corresponding signal is transmitted to the control board 500 described later. When the user performs an operation to switch the trigger switch 12 to the on state, the cutting of the reinforcing bar is started.

[0016] The cutting mechanism 100 is a part that cuts the reinforcing bar, which is the object to be cut. The cutting mechanism 100 has a pair of blade members 110 and a pair of link members 120.

[0017] Each blade member 110 is formed with a cutting blade 111 for sandwiching and cutting the object to be cut. The blade member 110 is held in a rotatable state around a shaft 101 fixed to the housing 11. In the present embodiment, the blade members 110 are arranged opposite to each other such that the leading edge ridges of the cutting blades 111 operate along an orbit passing through substantially the same plane. Thereby, it is possible to switch between an open state in which the respective cutting blades 111 are separated from each other and a closed state in which the respective cutting blades 111 are in contact (or close proximity) with each other. In the example of FIG. 1, the pair of cutting blades 111 are in the closed state.

[0018] The link member 120 is a rod-shaped member, one end of which is connected to the blade member 110 via a shaft 102, and the other end of which is connected to a connecting member 230 described later via a shaft 231. The link member 120 and the blade member 110 are connected to each other in a rotatable state around the shaft 102. Similarly, the link member 120 and the connecting member 230 are connected to each other in a rotatable state around the shaft 231. As will be described later, the connecting member 230 moves in the left-right direction of FIG. 1 by the driving force of the electric motor 400.

[0019] When the connecting member 230 moves leftward from the state of FIG. 1, the blade member 110 above in FIG. 1 rotates counterclockwise, and the blade member 110 below in FIG. 1 rotates clockwise. As a result, the pair of cutting blades 111 changes from the closed state to the open state. On the other hand, when the connecting member 230 moves rightward in FIG. 1 while the pair of cutting blades 111 is in the open state, the blade member 110 above in FIG. 1 rotates clockwise, and the blade member 110 below in FIG. 1 rotates counterclockwise. As a result, the pair of cutting blades 111 returns to the closed state. Thus, the entire pair of blade members 110, the pair of link members 120, and the connecting member 230 constitutes a so-called "toggle link mechanism".

[0020] A pair of guide plates 700 are provided near the blade member 110. The guide plates 700 are plate-like members formed of metal and are arranged to sandwich the blade member 110 from both the front side and the back side of the paper in FIG. 1. The shapes of the pair of guide plates 700 are identical to each other. As shown in FIG. 2, recesses 710 are formed in each of the guide plates 700. The recesses 710 are for accommodating the reinforcing bar in advance when the reinforcing bar is cut by the cutting blade 111.

[0021] For convenience of explanation, the right side in FIG. 1 is hereinafter also referred to as the "front end side", and the left side in the same figure is hereinafter also referred to as the "rear end side". The recess 710 is formed so as to recede from the front end side to the rear end side of the guide plate 700. When the cutting device 10 is viewed from the side as in FIGS. 1 and 2, each of the recesses 710 is formed at a position including the cutting blade 111 in the closed state. In the standby state where the cutting blade 111 is fully open, as shown in FIG. 3, each of the cutting blades 111 is in a state of retreating outside the recess 710, and substantially the entire blade member 110 is hidden by the guide plate 700.

[0022] The guide plate 700 has both the function of covering and protecting the cutting blade 111 in the standby state, and the function of guiding the reinforcing bar, which is the object to be cut, along the recess 710 to between the pair of cutting blades 111. Furthermore, the guide plate 700 also has the function of stabilizing the posture of the cutting device 10 before and after cutting by sandwiching the reinforcing bar in the recess 710. The specific configuration of the guide plate 700 will be described later.

[0023] Returning to Figure 1, let's continue the explanation. The ball screw 200 is a device that converts the rotational motion of the electric motor 400 into the linear motion of the connecting member 230, thereby operating the cutting mechanism 100. The ball screw 200 has a screw shaft 210, a nut 220, and a connecting member 230.

[0024] The screw shaft 210 is a rod-shaped member that extends linearly from the rear end to the front end. A male screw is formed on the outer surface of the screw shaft 210. When the electric motor 400 is driven, the screw shaft 210 rotates around its central axis.

[0025] The nut 220 is a substantially cylindrical member positioned to surround the screw shaft 210 from the outer circumference. A female thread is formed on the inner surface of the nut 220, which screws onto a male thread formed on the outer surface of the screw shaft 210. The nut 220 is allowed to move along the longitudinal direction of the screw shaft 210, but its rotation around the central axis of the screw shaft 210 is restricted. Therefore, when the screw shaft 210 rotates around its central axis, the nut 220 moves along that central axis in the left-right direction as shown in Figure 1.

[0026] The connecting member 230 is a member attached to the nut 220 and moves along the screw shaft 210 together with the nut 220. The connecting member 230 is attached so as to protrude toward the tip side from the nut 220. A pair of link members 120 are connected to the portion of the connecting member 230 near the tip end via the shaft 231 mentioned earlier.

[0027] A magnet 241 is attached to the outer surface of the connecting member 230. A Hall sensor 242 is also attached to the housing 11 in the vicinity of the connecting member 230. The position of the Hall sensor 242 is such that when the nut 220 moves to the rear end from the state shown in Figure 1 and the cutting blade 111 is fully opened, it faces the magnet 241 on the connecting member 230. When the cutting blade 111 is fully opened, the Hall sensor 242 emits a signal by facing the magnet 241, and this signal is input to the control board 500.

[0028] The reduction gear 300 is a device that reduces the rotation of the output shaft 410 of the electric motor 400 and then transmits it to the screw shaft 210 of the ball screw 200.

[0029] The electric motor 400 is a rotating electric machine that generates the driving force necessary for the operation of the cutting blade 111, and is, for example, a brushless DC motor. The electric motor 400 has an output shaft 410. The output shaft 410 is a substantially cylindrical member, and its central axis coincides with the central axis of the screw shaft 210. A portion of the output shaft 410 protrudes toward the reduction gear 300 and is connected to the reduction gear 300.

[0030] When current is supplied to the coil of the electric motor 400, the output shaft 410 rotates around its central axis. The rotation of the output shaft 410 is transmitted to the screw shaft 210 via the reduction gear 300, moving the nut 220 toward the front or rear end. This causes the cutting blade 111 of the cutting mechanism 100 to open and close, as described earlier.

[0031] A rotation sensor 420 is provided inside the electric motor 400. The rotation sensor 420 is a sensor that emits a pulse signal each time the output shaft 410 rotates by a predetermined angle, and is mounted on a circuit board 430 of the electric motor 400. The pulse signals from the rotation sensor 420 are transmitted to the control board 500. The control board 500 can determine the rotation angle of the output shaft 410 after a specific timing by counting the number of pulse signals. The control board 500 can also determine the rotation speed of the output shaft 410 based on the number of pulse signals input per unit time. The rotation sensor 420 may be a different type of sensor than in this embodiment, or it may be a sensor provided separately at a different location from the electric motor 400, as long as it can measure the rotation angle and rotation speed of the output shaft 410.

[0032] The control board 500 is a circuit board provided for controlling the overall operation of the cutting device 10, including the electric motor 400. The control board 500 includes an inverter circuit for adjusting the current supplied to the electric motor 400, and a microcontroller for controlling switching operations in the inverter circuit, etc.

[0033] The battery 600 stores the power necessary for the operation of the electric motor 400 and the control board 500, and is, for example, a lithium-ion battery. The part of the cutting device 10 that houses the battery 600 can be detached from the housing 11 as a battery pack and can be charged by connecting it to an external charger. Alternatively, the device may be configured to allow charging of the battery 600 while it remains attached to the housing 11.

[0034] When the user switches the trigger switch 12 to the ON position, the control board 500 detects this and moves the cutting blade 111 in the closing direction to cut the reinforcing bar. To perform this control, the control board 500 controls the operation of the electric motor 400 while acquiring the current position of the connecting member 230.

[0035] In this embodiment, the count value of the pulse signal input from the rotation sensor 420, based on the point in time when the magnet 241 and the Hall sensor 242 are facing each other, is calculated and acquired by the control board 500 as the "current position" of the connecting member 230.

[0036] To enable the acquisition of the current position of the connecting member 230, a reset operation may be performed when the cutting device 10 is activated. In the reset operation, for example, the electric motor 400 may be driven in the direction that moves the pair of cutting blades 111 from the closed state to the open state, and the electric motor 400 may be stopped when a detection signal is input from the Hall sensor 242. If the pulse signal counting is started from this point, the current position of the connecting member 230 thereafter can be accurately acquired.

[0037] The control board 500 controls the opening and closing operation of the cutting blade 111 by adjusting the magnitude of the current supplied to the electric motor 400, for example, by PWM control. The control board 500 also controls the braking operation of the cutting blade 111 by performing a so-called "short brake" by periodically or continuously short-circuiting some of the coils of the electric motor 400.

[0038] It should be noted that the control described above is merely one example. The control by the control board 500 only needs to operate the cutting blade 111 according to the state of the trigger switch 12, and various known control methods can be employed.

[0039] The specific configuration of the guide plate 700 will now be described. As shown in Figure 2, the recess 710 for accommodating the reinforcing bar to be cut is formed to recede from the tip of the guide plate 700 along a predetermined direction. The "predetermined direction" here refers to the direction from the tip side to the rear end side, which is parallel to the central axis of the screw shaft 210.

[0040] The edges of the recess 710 shown in Figures 2 and 3 include a pair of straight sections 711 that are parallel to each other and facing each other at a predetermined distance apart. The direction in which each straight section 711 extends is the same as the predetermined direction described above.

[0041] As shown in Figure 3, the distance between the pair of straight sections 711 (the predetermined distance mentioned above) is W. This W will also be referred to as "distance W" below. Distance W can also be called the width of the recess 710. The dimension of the interval W is set to be approximately equal to the typical diameter of the reinforcing bar that the cutting device 10 is cutting.

[0042] In Figure 3, "C1" represents the central axis of the shaft 101, which extends along the depth direction of the paper. The blade member 110 and the cutting blade 111 rotate around this C1. In other words, the central axis represented by C1 corresponds to the rotational axis of the blade member 110 and the cutting blade 111. The central axis represented by C1 will also be referred to as the "rotational axis C1" below.

[0043] In Figure 3, the circle indicated by the dotted line DL2 is a circle centered on the rotation axis C1 and passing through the tip of the guide plate 700. When viewed along the rotation axis C1 as shown in Figure 3, the outer shape of the tip portion of the guide plate 700 is an arc shape, with a portion of it coinciding with the dotted line DL2. In other words, the center of curvature of this portion lies on the rotation axis C1. This arc-shaped tip portion will also be referred to as the "arc portion 701" below.

[0044] The dotted line DL1 shown in Figure 3 passes through the rotational axis C1 and is parallel to the central axis of the screw shaft 210. The intersection point P1 of the dotted line DL1 and the dotted line DL2 is located on the arc portion 701 and is the furthest forward position on the guide plate 700 along the "predetermined direction" described above. This position will also be referred to as the "first position P1" below.

[0045] In Figure 3, the circle indicated by the dotted line DL3 is a circle centered on the rotation axis C1 and passing through the tip of the cutting blade 111. The dotted line DL3 can also be said to indicate the trajectory of the cutting blade 111's movement. In Figure 3, the dotted lines DL1, DL2, DL3, etc. are shown only for the upper part of the recess 710, but the configuration of the part of the cutting device 10 shown in Figure 3 is symmetrical above and below the recess 710.

[0046] P2, the intersection of dotted line DL1 and dotted line DL3, represents the position closest to the tip of the cutting blade 111 along the "predetermined direction" described above within its operating range. This position will also be referred to as the "second position P2" below. In this embodiment, the guide plate 700 is configured such that the distance L between the first position P1 and the second position P2 along the predetermined direction is 1 / 4 or less of the interval W.

[0047] Let me explain the advantages of this configuration. At construction sites, as shown in Figure 4, there are times when it is necessary to cut reinforcing bars RB, which are installed on the floor level (FL), using a cutting device without lifting them in that state. However, if the cutting device is equipped with a guide plate, the guide plate will hit the floor level (FL) before the cutting blade, so the reinforcing bars RB may not be able to penetrate deep enough into the recess of the guide plate, and there may be cases where the reinforcing bars RB cannot be cut.

[0048] Therefore, in this embodiment, the amount of protrusion of the guide plate 700 is kept small so that L ≤ 1 / 4 × W as described above.

[0049] When using the cutting device 10 with this configuration to cut the reinforcing bar RB while it is installed on the floor FL, the user operates the cutting blade 111 in the closing direction with the arc portion 701 of the guide plate 700 in contact with the floor FL, as shown in Figure 4. The cutting blade 111 operates along a trajectory such that its tip passes through the dotted line DL3 in Figure 4.

[0050] The dotted line DL4 in Figure 4 represents the position of the cutting blade 111 when the door is closed. Point P3 is the intersection of dotted line DL4 and dotted line DL3.

[0051] When the cutting blade 111 is moving in the closing direction, the tip of the cutting blade 111 is closest to the floor FL as it passes through the second position P2. After that, the tip of the cutting blade 111 moves slightly away from the floor FL and eventually reaches point P3.

[0052] In most cases, the diameter of the reinforcing bar RB is approximately equal to the spacing W, which is the width of the recess 710. In this case, the tip of the cutting blade 111, operating as described above, will pass approximately near the center of the reinforcing bar RB, as shown in Figure 4. As each cutting blade 111 moves along the trajectory described above and passes through while cutting a portion of the reinforcing bar RB, the areas of the reinforcing bar RB that the cutting blade 111 does not pass through will also fracture due to plastic deformation. Therefore, the reinforcing bar RB can be cut at that location. The same applies even when the reinforcing bar RB is located near a wall or the like that is perpendicular to the floor.

[0053] Thus, the cutting device 10 according to this embodiment can cut reinforcing bars RB located near the floor FL, etc., while protecting the cutting blade 111 with the guide plate 700.

[0054] The guide plate 700 of this embodiment is provided with an arc portion 701 at its tip. As explained with reference to Figure 3, the center of curvature of the arc portion 701 lies on the rotational axis C1. Therefore, even when a portion of the arc portion 701 other than the first position P1 is brought into contact with the floor FL, for example, when there are irregularities on the floor FL, the minimum necessary distance can be secured between the tip of the cutting blade 111 and the floor FL.

[0055] A second embodiment will now be described. The following will primarily focus on the differences from the first embodiment, omitting explanations of points common to both embodiments as appropriate. In this embodiment, the shape of the guide plate 700 differs from that of the first embodiment.

[0056] As shown in Figure 5, in this embodiment, the tip of the guide plate 700 is not arc-shaped, and a flat surface 702 is provided at the tip of the guide plate 700. The flat surface 702 is a surface perpendicular to the central axis of the screw shaft 210.

[0057] The dotted line DL1 in Figure 5 is the same as the dotted line DL1 shown in Figure 3. The intersection of the dotted line DL1 and the flat surface 702 is the first position P1 in this embodiment. The flat surface 702 can be said to be the surface that includes the first position P1, which is the furthest tip position of the guide plate 700.

[0058] Although not shown in the figures, the same "second position P2" as in the first embodiment can be defined in this embodiment as well. In this embodiment as well as in the first embodiment, the position of the flat surface 702 on the guide plate 700 is adjusted so that the distance L between the first position P1 and the second position P2 along a predetermined direction is 1 / 4 or less of the interval W. This configuration also produces the same effects as those described in the first embodiment.

[0059] Similar to Figure 4, when cutting the reinforcing bar RB while it is installed on the floor FL, the user operates the cutting blade 111 in the closing direction with the flat surface 702 of the guide plate 700 in contact with the floor FL. Since the entire flat surface 702 is in contact with the floor FL, the posture of the cutting device 10 during cutting can be further stabilized.

[0060] A third embodiment will now be described. The following will primarily focus on the differences from the first embodiment, omitting explanations of points common to both embodiments as appropriate. This embodiment differs from the first embodiment in the configuration of the guide plate 700.

[0061] As shown in Figure 6, each guide plate 700 in this embodiment is divided into a base portion 700A, which overlaps with the shaft 101, and a tip portion 700B, which is the tip portion. The base portion 700A and the tip portion 700B are connected by a slide shaft 751 and a screw shaft 752.

[0062] The slide shaft 751 is a rod-shaped member that extends linearly in a direction parallel to the central axis of the screw shaft 210. The tip end of the slide shaft 751 is fixed to the tip portion 700B. The rear end portion of the slide shaft 751 is supported by the base portion 700A in a state that allows it to slide in a direction parallel to the central axis of the screw shaft 210. Two slide shafts 751 are provided for each tip portion 700B, but the number of slide shafts 751 may differ.

[0063] The screw shaft 752 is a rod-shaped member that extends linearly in a direction parallel to the central axis of the screw shaft 210, and has a male screw (not shown) formed on its outer surface. The tip end of the screw shaft 752 is fixed to the tip portion 700B. The screw shaft 752 is inserted inside the adjustment nut 753 provided on the base portion 700A.

[0064] The adjustment nut 753 has a through hole (not shown) formed therein, and the screw shaft 752 is inserted through this through hole. A female thread is formed on the inner surface of the through hole in the adjustment nut 753, and it is screwed into the male thread on the outer surface of the screw shaft 752.

[0065] The adjustment nut 753 is fixed to the base portion 700A in a state that allows it to rotate around its central axis. When the user rotates the adjustment nut 753, the screw shaft 752 moves along its longitudinal direction, and the tip portion 700B also moves together with the screw shaft 210. In other words, the entire guide plate 700, consisting of the base portion 700A and the tip portion 700B, expands and contracts along the longitudinal direction of the screw shaft 752. To facilitate this operation, part or all of the adjustment nut 753 may be exposed to the outside through an opening provided in the base portion 700A.

[0066] In this way, the user can adjust the amount of protrusion of the guide plate 700 from the cutting blade 111 (corresponding to distance L in Figure 3) by rotating the adjustment nut 753 to extend or retract the guide plate 700. The slide shaft 751, screw shaft 752, and adjustment nut 753 constitute the "extension mechanism" for extending or retracting the guide plate 700. The configuration may also be such that the above-mentioned protrusion amount can be adjusted to be negative. In other words, the configuration may be such that the cutting blade 111 protrudes further towards the tip than the guide plate 700.

[0067] The specific configuration of the telescopic mechanism may differ from that of this embodiment. For example, a worm gear may be used instead of the adjustment nut 753.

[0068] The embodiments have been described above with reference to specific examples. However, this disclosure is not limited to these specific examples. Modifications made to these specific examples by those skilled in the art are also included within the scope of this disclosure, as long as they retain the features of this disclosure. The elements, their arrangement, conditions, shapes, etc., of each of the aforementioned specific examples are not limited to those illustrated and can be modified as appropriate. The elements of each of the aforementioned specific examples can be combined in different ways as appropriate, as long as no technical inconsistencies arise. [Explanation of Symbols]

[0069] 10: Cutting device 111: Cutting blade 400: Electric motor 700: Guide Plate 701: Arc section 702: Flat surface 710: Recess 711: Straight section 751: Slide axis 752: Screw shaft 753: Adjustment nut C1: Rotational axis L: distance P1: 1st position P2: 2nd position W: Interval

Claims

1. An electric cutting device, A pair of cutting blades that rotate around a central axis of rotation to grip and cut the object to be cut, An electric motor that generates the driving force necessary for the operation of the cutting blade, A guide plate is provided, which has a recess for holding the object to be cut when the object to be cut is cut by a pair of cutting blades, and the recess is formed to retract along a predetermined direction, The edges of the recess include a pair of straight sections that are parallel to each other and facing each other at a predetermined distance apart. The position of the guide plate that is furthest forward along the predetermined direction is designated as the first position. When the position that is the furthest forward along the predetermined direction within the operating range of the cutting blade is defined as the second position, The first position is located closer to the tip along the predetermined direction than the second position, and A cutting device in which the distance between the first position and the second position along the predetermined direction is 1 / 4 or less of the predetermined interval.

2. The cutting device according to claim 1, further comprising an extension / retraction mechanism for extending and retracting the guide plate along the predetermined direction.

3. The cutting device according to claim 1, wherein the portion of the guide plate including the first position is provided with an arc-shaped portion whose outer shape is arc-shaped when viewed along the rotational axis.

4. The cutting device according to claim 3, wherein the center of curvature of the arc portion lies on the axis of rotation.

5. The cutting apparatus according to claim 1, wherein the portion of the guide plate including the first position is provided with a flat surface perpendicular to the predetermined direction.

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