Cutting device

Abstract

To provide a cutting device in which a cutting blade can be easily replaced.SOLUTION: A cutting device includes: a first cutting blade in which a first opening and a second opening are formed; a first link in which an opening is formed; a frame in which an opening is formed; a first shaft member pivotably connecting the first cutting blade to the first link by being inserted into the first opening and the opening of the first link; a second shaft member pivotably connecting the first cutting blade to the frame by being inserted into the second opening and the opening of the frame; a first movement restriction member configured to restrict the first shaft member inserted into the first opening and the opening of the first link from moving in a direction of separating from the first opening; and a second movement restriction member configured to restrict the second shaft member inserted into the second opening and the flame from moving in a direction of separating from the second opening.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cutting device. [Background technology]

[0002] 2. Description of the Related Art In recent years, cutting devices capable of cutting metals such as reinforcing bars have become known.

[0003] Patent Documents 1 and 2 disclose such cutting devices. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2021-171580 A [Patent Document 2] Microfilm of Jitsukou 2-8651 Summary of the Invention [Problem to be solved by the invention]

[0005] In such cutting devices, the cutting blade is attached to the main body with bolts and nuts, so in order to replace an old cutting blade that has become worn or chipped with a new one, it is necessary to loosen the nuts to remove the worn cutting blade from the main body, and then reattach the new cutting blade to the main body with the bolts and nuts, which is a cumbersome task.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a cutting device that allows the cutting blade to be easily replaced. [Means for solving the problem]

[0007] The cutting device of the present application comprises a first cutting blade having a first opening and a second opening, a first link having an opening formed therein, a frame having an opening formed therein, at least one of a first shaft member that rotatably connects the first cutting blade to the first link by being inserted through the first opening and the opening of the first link, and a second shaft member that rotatably connects the first cutting blade to the frame by being inserted through the second opening and the opening of the frame, and at least one of a first movement restricting member that is disposed at a rear end of the first shaft member inserted through the first opening and the opening of the first link, thereby restricting the first shaft member from moving in a direction away from the first opening, and a second movement restricting member that is disposed at a rear end of the second shaft member inserted through the second opening and the opening of the frame, thereby restricting the second shaft member from moving in a direction away from the second opening.

[0008] The first movement restricting member may be disposed opposite to an end face of the first shaft member, thereby restricting the first shaft member from moving in a direction in which the first shaft member is removed from the first opening.

[0009] The second movement restricting member may be disposed opposite to an end face of the second shaft member, thereby restricting the second shaft member from moving in a direction in which the second shaft member is removed from the second opening.

[0010] Here, the "end face" refers to a surface formed at the end (sometimes called the "rear end") corresponding to the rear end side, not the end (sometimes called the "front end") corresponding to the front end side when inserted into an opening such as the first opening, of the two end parts of the shaft member such as the first shaft member in the axial direction, facing the direction in which the shaft member such as the first shaft member inserted into the opening is removed (sometimes called the "removal direction"). For example, when the shaft member such as the first shaft member has a cylindrical part (sometimes called the "large diameter part") formed relatively long in the axial direction, and a cylindrical part (sometimes called the "small diameter part") formed relatively short in the axial direction (for example, 20% or less of the axial length of the large diameter part) and with a small diameter at the rear end side of the large diameter part, the "end face" includes a surface formed facing the removal direction of the small diameter part, and a surface formed at a step between the small diameter part and the large diameter part facing the removal direction. In this case, a restricting member such as the first movement restricting member may be disposed opposite to one of the "end faces".

[0011] As another example, if a shaft member such as the first shaft member is formed in a cylindrical shape but has a groove portion formed with a groove at the rear end, the "end face" is the rear end face and a face formed in the groove portion facing the detachment direction. In this case, a restricting member such as the first movement restricting member may be disposed opposite one of the "end faces". [Brief description of the drawings]

[0012] [Figure 1A] FIG. 1A is a perspective view of a cutting device according to one embodiment. [Figure 1B] FIG. 1B is a front view of a cutting device according to one embodiment. [Diagram 2] FIG. 2 is a side view of a cutting device according to one embodiment. [Figure 3A] FIG. 3A is a cross-sectional view taken along line AA in FIG. [Figure 3B] FIG. 3B is a cross-sectional view taken along line BB of FIG. [Figure 4] FIG. 4 is a perspective view showing a procedure for replacing the cutting blade of the cutting device according to one embodiment. [Diagram 5]FIG. 5 is a perspective view showing a procedure for replacing the cutting blade of the cutting device according to one embodiment. [Figure 6] FIG. 6 is a perspective view showing a procedure for replacing the cutting blade of the cutting device according to one embodiment. [Figure 7] FIG. 7 is a perspective view showing a procedure for replacing the cutting blade of the cutting device according to one embodiment. [Figure 8] FIG. 8 is a perspective view showing a procedure for replacing the cutting blade of the cutting device according to one embodiment. [Figure 9] FIG. 9 is a perspective view showing a procedure for replacing the cutting blade of the cutting device according to one embodiment. [Figure 10A] FIG. 10A is a cross-sectional view of a cutting device according to one embodiment. [Figure 10B] FIG. 10B is a cross-sectional view of a cutting device according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are merely examples for explaining the present invention, and are not intended to limit the present invention to the embodiments.

[0014] The cutting device disclosed in this embodiment is configured to be able to cut an object to be cut, such as rebar, sandwiched between a pair of opposing cutting blades, by the cutting blades formed on each of the pair of cutting blades moving relatively on roughly the same plane and coming into contact (or close proximity) with each other.

[0015] The configuration of the cutting device 10 according to this embodiment will be described below. Fig. 1A is a perspective view of the cutting device 10 as seen from the front side, and Fig. 1B is a front view of the cutting device 10 as seen from the front. Fig. 2 is a left side view of the cutting device 10 (however, as will be described later, part of the housing is omitted), and Figs. 3A and 3B are AA and BB cross-sectional views of Fig. 2. Figs. 4 to 9 are perspective views showing the procedure for replacing the cutting blade.

[0016] As shown in these drawings, in this embodiment, the direction in which the first cutting blade 111 and the second cutting blade 112 exist relative to the actuator (e.g., the electric motor 400) of the cutting device 10 is referred to as the forward or positive X-axis direction, and the opposite direction is referred to as the backward or negative X-axis direction, and may be collectively referred to as the front-rear direction or X-axis direction. The direction in which the first cutting blade 111 exists relative to the second cutting blade 112 is referred to as the upward or positive Z-axis direction, and the direction in which the second cutting blade 112 exists relative to the first cutting blade 111 is referred to as the downward or negative Z-axis direction, and may be collectively referred to as the up-down direction or Z-axis direction. The direction perpendicular to the X-axis and Z-axis based on a right-handed Cartesian coordinate system may be referred to as the positive Y-axis direction (rightward) or negative Y-axis direction (leftward), and may be collectively referred to as the left-right direction, width direction, or Y-axis direction. In this embodiment, the first cutting blade 111 and the second cutting blade 112 are configured to be rotatable around the Y-axis direction as the rotation axis, and the first cutting blade 111E, which is the cutting blade of the first cutting blade 111, and the second cutting blade 112E, which is the cutting blade of the second cutting blade 112, are configured to move up and down on the XZ virtual plane (Figure 1B).

[0017] The cutting device 10 includes a housing 11, a trigger switch 12, a cutting mechanism, a moving mechanism 200, a reducer 300, an electric motor 400, a control board, and a storage battery 600.

[0018] The housing 11 is a container or housing that defines the outer shape of the cutting device 10, and is made of, for example, resin. A reducer 300, an electric motor 400, and the like, which will be described later, are housed inside the housing 11. Fig. 2 shows the internal configuration of the cutting device 10, since the portion of the housing 11 on the near side of the page is not shown.

[0019] The housing 11 in this embodiment includes a housing body 11A and a cover 11B that is detachably provided on the housing body 11A.

[0020] The housing body 11A constitutes the main part of the housing 11 and is a part that houses the reducer 300, the electric motor 400, etc. The cover 11B is a part that is temporarily removed from the housing body 11A when replacing the first cutting blade 111 and the second cutting blade 112, and is a part that constitutes one side surface (the left side surface in this embodiment) of the front end portion of the housing 11. As will be described later, according to the cutting device 10 of this embodiment, the first cutting blade 111 and the second cutting blade 112 can be easily replaced by removing the cover 11B.

[0021] It should be noted that known means can be used for attaching and detaching the cover 11B from the housing main body 11A, and in this embodiment, the cover 11B is configured to be attachable and detachable to the housing main body 11A using screws as shown in Fig. 4. However, this is not limited to this, and for example, the two may be connected using means such as a hinge, and the cover 11B may be configured to be opened and closed relative to the housing main body 11A, so that the cover 11B can be removed from the housing main body 11A by opening the cover 11B, and the cover 11B can be attached to the housing main body 11A by closing the cover 11B.

[0022] In this embodiment, the housing body 11A and a part fixed to the housing body 11A may be referred to as a frame. The cutting device 10 includes a pair of frame parts 11F fixed to the housing body 11A itself or a part fixed to the housing body 11A as a part of the frame. The pair of frame parts 11F are fixed to the housing body 11A itself or a part (e.g., the reducer 300) fixed to the housing body 11A, and extend forward in the X-axis direction to positions where the second opening H2 of the first cutting blade 111 and the fourth opening H4 of the second cutting blade 112 (FIG. 9) are provided. One frame part 11F is provided at a position between the cover 11B and the pair of cutting blades, and the other frame part 11F is provided at a position between a side surface of the housing body 11A facing the Y-axis positive direction and the pair of cutting blades, so as to sandwich the first cutting blade 111 and the second cutting blade 112 in the Y-axis direction.

[0023] The pair of frame portions 11F are each formed with a frame opening FH1 at a position corresponding to the second opening H2 and a frame opening FH2 at a position corresponding to the fourth opening H4, the second opening H2 and the frame opening FH1 being formed at an overlapping position in the Y-axis direction, and the fourth opening H4 and the frame opening FH2 being formed at an overlapping position in the Y-axis direction. Therefore, by moving the second pin P2 in the Y-axis positive direction, it is possible to insert it through the second opening H2 and the frame opening FH1, and by moving the fourth pin P4 in the Y-axis positive direction, it is possible to insert it through the fourth opening H4 and the frame opening FH2.

[0024] In this embodiment, the frame portion 11F further includes a third stopper ST3 (an example of a "second movement restricting member") which is arranged opposite the end face P2S of the second pin P2 facing in the negative Y-axis direction, thereby restricting the second pin P2 from moving in the negative Y-axis direction, which is the direction in which it detaches from the second opening H2 and the first frame opening FH1, and which is arranged opposite the end face P4S of the fourth pin P4 facing in the negative Y-axis direction, thereby restricting the fourth pin P4 from moving in the negative Y-axis direction, which is the direction in which it detaches from the fourth opening H4 and the second frame opening FH2.

[0025] 2, the third stopper ST3 has three protrusions formed to protrude in three directions, and a base end portion corresponding to one of the protrusions is attached to the frame portion 11F by a male screw that screws into a female screw formed in the frame. The other two protrusions of the third stopper ST3 function as leaf springs that exert a biasing force in the positive direction of the Y axis, which is opposite to the detachment direction of the second pin P2 and the fourth pin P4. In addition, the third stopper ST3 is provided so as to be rotatable with respect to the base end portion by loosening the male screw.

[0026] According to this configuration, after the second pin P2 (fourth pin P4) is inserted into the second opening H2 (fourth opening H4) and the first frame opening FH1 (second frame opening FH2), the leaf springs of the two protruding parts of the third stopper ST3 are positioned opposite the end faces P2S and P4S, respectively, and screwed in place, thereby restricting the second pin P2 and the fourth pin P4 from moving in the detachment direction (negative direction of the Y-axis). This makes it possible to prevent the second pin P2 or the fourth pin P4 from coming loose and releasing the connection between the first cutting blade 111 and the frame portion 11F or the connection between the second cutting blade 112 and the frame portion 11F.

[0027] The trigger switch 12 is a switch that is operated by the user's finger. The user can turn the trigger switch 12 on by placing his / her finger on the trigger switch 12 and pulling it towards himself / herself. When the user releases the pressure of his / her finger, the trigger switch 12 returns to its original position by the force of the spring and turns to the off state. When the trigger switch 12 is switched between the on state and the off state, a corresponding signal is sent to a control board, which will be described later. The trigger switch 12 corresponds to an "operation unit" that is switched between the on state and the off state by the user's operation. As will be described later, when the user switches the trigger switch 12 to the on state, cutting of the rebar begins.

[0028] The cutting mechanism is a mechanism for cutting reinforcing bars, which are objects to be cut. The cutting mechanism has a pair of cutting blades, a first cutting blade 111 and a second cutting blade 112, and a pair of link members, a first link 121 and a second link 122.

[0029] 9, at least two openings, a first opening H1 and a second opening H2, are formed in the first cutting blade 111. As described below, the first opening H1 is an opening for connecting the first cutting blade 111 to the first link 121, and the second opening H2 is an opening for connecting the first cutting blade 111 to the frame portion 11F.

[0030] Furthermore, as described later, by inserting the first pin P1 through the first opening H1 and the first link opening LH1 (Figure 6) formed in the first link 121, it is possible to transmit the movement of the first link 121 to the first cutting blade 111, thereby making it possible to rotatably connect the first cutting blade 111 to the first link 121.

[0031] Furthermore, as described later, by inserting a second pin P2 through the second opening H2 and a first frame opening FH1 (FIG. 9) formed in the frame portion 11F, the first cutting blade 111 can be rotatably connected to the frame portion 11F.

[0032] With this configuration, the first cutting blade 111 is provided rotatably based on a force acting from the first link 121, with the second pin P2 fixed to the frame portion 11F as a rotation axis (fulcrum), so that the first cutting blade 111E of the first cutting blade 111 can be moved closer to the second cutting blade 112E of the second cutting blade 112 during cutting, and moved away from the second cutting blade 112E after cutting. Here, the second pin P2 serving as the rotation axis is inserted parallel to the Y-axis direction, so the first cutting blade 111E moves on the XZ imaginary plane IP1 (FIG. 1B).

[0033] In this embodiment, the first cutting blade 111 is further provided with a first stopper ST1 (Figure 9; an example of a "first movement restricting member") that is arranged opposite the end face P1S of the first pin P1 facing the negative Y-axis direction, thereby restricting the first pin P1 from moving in the negative Y-axis direction, which is the direction in which the first pin P1 detaches from the first opening H1 and the first link opening LH1.

[0034] The base end of the first stopper ST1 is attached to the first cutting blade 111 by a male screw that screws into a female screw formed on the first cutting blade 111. The tip end of the first stopper ST1 is a leaf spring that exerts a biasing force in the positive direction of the Y axis opposite to the detachment direction of the first pin P1. In addition, the tip end of the first stopper ST1 is provided so as to be rotatable with respect to the base end by loosening the male screw.

[0035] According to this configuration, after the first pin P1 is inserted into the first opening H1 and the first link opening LH1, the leaf spring at the tip of the first stopper ST1 is positioned opposite the end face P1S, thereby restricting the first pin P1 from moving in the detachment direction (negative direction of the Y-axis). This makes it possible to prevent the first pin P1 from coming loose and releasing the connection between the first cutting blade 111 and the first link 121.

[0036] Moreover, the first stopper ST1 is provided (attached) to the first cutting blade 111. Since the relative positional relationship between the first cutting blade 111 and the first opening H1 does not change, this configuration makes it possible to arrange the first stopper ST1 facing the end face P1S of the first pin P1 facing the negative Y-axis direction even if the first pin P1 moves in response to the movement of the first link 121. However, for the same reason, the first stopper ST1 may be provided (attached) to the first link 121, or may be provided in a different configuration. For example, the movement of the first pin P1 in the detachment direction (negative Y-axis direction) may be restricted by providing an inner wall surface of the cover 11B so as to be adjacent to and facing the end face P1S.

[0037] The second cutting blade 112 has the same configuration as the first cutting blade 111 and is arranged vertically symmetrically with the first cutting blade 111 (FIG. 2), so a detailed description will be omitted. The second cutting blade 112 has a third opening H3 (FIG. 9) formed corresponding to the first opening H1 for connecting the second cutting blade 112 to the second link 122, and a fourth opening H4 formed corresponding to the second opening H2 for connecting the first cutting blade 111 to the frame portion 11F. By inserting a third pin P3 (FIG. 9) through the third opening H3 and a second link opening LH2 formed in the second link 122, the second cutting blade 112 can be rotatably connected to the second link 122. In addition, by inserting a fourth pin P4 (FIG. 9) through the fourth opening H4 and a second frame opening FH2 formed in the frame portion 11F, the second cutting blade 112 can be rotatably connected to the frame portion 11F.

[0038] With this configuration, the second cutting blade 112 is configured to be rotatable around the fourth pin P4 fixed to the frame portion 11F as a rotation axis (fulcrum). Here, the fourth pin P4, which serves as the rotation axis, is inserted parallel to the Y-axis direction, so the second cutting blade 112E moves on the XZ imaginary plane IP1 (FIG. 1B). Therefore, the first cutting blade 111E and the second cutting blade 112E move toward each other during cutting, and move away from each other on the XZ imaginary plane IP1 (FIG. 1B) after cutting.

[0039] Furthermore, the second cutting blade 112 is disposed opposite the end face P3S of the third pin P3 facing the negative Y-axis direction, and is provided with a second stopper ST2 (an example of a "first movement restricting member") that restricts the third pin P3 from moving in the negative Y-axis direction, which is the direction in which the third pin P3 detaches from the third opening H3 and the second link opening LH2. Therefore, after the third pin P3 is inserted through the third opening H3 and the second link opening LH2, the leaf spring at the tip of the second stopper ST2 is placed in a position opposite the end face P2S, thereby making it possible to restrict the second pin P2 from moving in the detaching direction.

[0040] As described above, in the cutting device 10 of this embodiment, the first cutting blade 111 and the second cutting blade 112 are arranged to face each other so that the first cutting blade 111E and the second cutting blade 112E, which are the ridges of the cutting edges of the first cutting blade 111 and the second cutting blade 112, move on a trajectory that passes through the XZ virtual plane IP1, which is approximately the same plane. This makes it possible to switch between an open state in which the first cutting blades 111 and the second cutting blades 112 are separated from each other, and a closed state in which the first cutting blades 111 are in contact (or close to each other). In the example of Figs. 1 and 2, the pair of the first cutting blade 111 and the second cutting blade 112 are in the closed state.

[0041] The first link 121 (second link 122) which is a link member is a rod-shaped member, one end of which is rotatably connected to the first cutting blade 111 (second cutting blade 112) via the first pin P1 (third pin P3), and the other end of which is rotatably connected to a moving member 230 which will be described later. As will be described later, the moving member 230 is configured to be movable in the front-rear direction (X-axis direction) by the driving force of the electric motor 400. As shown in FIG. 3A and FIG. 4 etc., the first link 121 (second link 122) in this embodiment is configured from a sheet metal part having a U-shaped cross section, which is made up of two plate-shaped members parallel to the XZ plane and one plate-shaped member parallel to the Y-axis direction connecting the two plate-shaped members.

[0042] In FIG. 2, when the moving member 230 moves in the negative direction of the X axis (to the left in FIG. 2), the first cutting blade 111 on the upper side of the paper in FIG. 2 rotates in the counterclockwise direction, and the second cutting blade 112 on the lower side of the paper in FIG. 2 rotates in the clockwise direction. As a result, the pair of the first cutting blade 111 and the second cutting blade 112 changes from the closed state to the open state. On the other hand, when the moving member 230 moves in the positive direction of the X axis (to the right in FIG. 2) while the pair of the first cutting blade 111 and the second cutting blade 112 are in the open state, the first cutting blade 111 on the upper side of the paper in FIG. 2 rotates in the clockwise direction, and the second cutting blade 112 on the lower side of the paper in FIG. 2 rotates in the counterclockwise direction. As a result, the pair of the first cutting blade 111 and the second cutting blade 112 return to the closed state. In this way, the pair of cutting blades, the pair of links, and the moving member 230 as a whole constitute a so-called "toggle link mechanism."

[0043] The cutting device 10 of this embodiment is provided with a pair of guide plates 700 near the cutting blades. The guide plates 700 have a function of covering and protecting the pair of cutting blades in a standby state, a function of guiding the reinforcing bar, which is the object to be cut, between the pair of cutting blades along the recesses 710, and a function of stabilizing the posture of the cutting device 10 before and after cutting by sandwiching the reinforcing bar in the recesses 710.

[0044] The guide plate 700 is a plate-like member made of metal, and is arranged to sandwich the pair of cutting blades from both sides in the Y-axis direction. The pair of guide plates 700 have the same shape. As shown in FIG. 2, each guide plate 700 is formed with a recess 710 recessed from the front end toward the rear. In a standby state in which the pair of cutting blades are fully open, each cutting blade is retracted to the outside of the recess 710.

[0045] The moving mechanism 200 is a device that converts the rotational motion of the electric motor 400 into the linear motion of the moving member 230, thereby operating the cutting mechanism. The moving mechanism 200 can be realized by, for example, a known ball screw mechanism, and has a screw shaft, a nut, and the moving member 230 connected to the nut.

[0046] The screw shaft is a rod-shaped member that extends linearly in the X-axis direction from the rear end side to the front end side. A male screw is formed on the outer circumferential surface of the screw shaft, and when the electric motor 400 is driven, the screw shaft rotates around its central axis. On the other hand, the nut is a substantially cylindrical member that is arranged to surround the screw shaft from the outer circumferential side, and a female screw is formed on the inner circumferential surface of the nut, which screws into the male screw formed on the outer circumferential surface of the screw shaft. The nut is allowed to move along the X-axis direction, but is restricted from rotating around the central axis of the screw shaft. Therefore, when the screw shaft rotates around its central axis, the nut and the moving member 230 connected thereto are configured to be able to advance and retreat along the X-axis direction.

[0047] The reducer 300 transmits the rotation of the output shaft of the electric motor 400 to the screw shaft of the ball screw mechanism after reducing the speed.

[0048] The electric motor 400 is a rotary electric motor for generating a driving force required for the operation of the pair of cutting blades, and is, for example, a brushless DC motor. The output shaft of the electric motor 400 is connected to the reduction gear 300.

[0049] When a current is supplied to the coil of the electric motor 400 and the output shaft rotates, the screw shaft rotates via the reducer 300, so that the nut and the moving member 230 move forward or backward depending on the direction of rotation. Since the first link 121 and the second link 122 rotate in response to the forward or backward movement of the moving member 230, it becomes possible to open and close the pair of cutting blades (the first cutting blade 111 and the second cutting blade 112) of the cutting device 10 as described above.

[0050] The electric motor 400 is provided with sensors (not shown) (for example, a hall sensor for acquiring rotational position information and rotational speed information of the rotor of the electric motor 400, and a position sensor for acquiring position information of the nut in the X-axis direction) and a control board (not shown), and an inverter circuit including a control IC and switching elements mounted on the control board is configured to be able to control the electric motor 400 based on detection information from the sensors (for example, position information of the rotor of the electric motor 400).

[0051] The storage battery 600 stores the power required for the operation of the electric motor 400 and the control board, and is, for example, a lithium ion battery. The part of the cutting device 10 in which the storage battery 600 is built can be detached from the housing 11 as a battery pack, and can be charged by connecting to an external charger. Instead of this embodiment, a configuration in which the storage battery 600 can be charged while it is attached to the housing 11 may be used.

[0052] The four pins, the first pin P1 (an example of a "first shaft member"), the second pin P2 (an example of a "second shaft member"), the third pin P3 (an example of a "third shaft member") and the fourth pin P4 (an example of a "fourth shaft member"), are formed in a cylindrical shape having a central axis as shown in FIG. 9 and the like, and each pin has a main body portion having a cylindrical surface on its side and a flange portion formed by expanding the diameter from the main body portion (the main body portion of the first pin P1 is called the main body portion P1B and the flange portion is called the flange portion P1F, and similar reference numerals may be used for the other pins). The main body portion of each pin has an outer diameter smaller than the opening diameter (diameter) of the opening through which the pin is inserted, and the flange portion of each pin has an outer diameter larger than the opening diameter (diameter) of the opening through which the pin is inserted.

[0053] Therefore, by moving each pin in the positive direction on the Y axis, it is possible to connect components that have two openings through which each pin passes, and by moving each pin in the negative direction on the Y axis, it is possible to separate components that have two openings through which each pin passes.

[0054] As shown in FIG. 3A, the cylindrical body P1B of the first pin P1 is inserted through both the first link opening LH1 formed to penetrate the first link 121 and the first opening H1 formed to penetrate the first cutting blade 111, thereby connecting the first link 121 and the first cutting blade 111. A first stopper ST1 is disposed to the left of the end face P1S of the first pin P1, thereby preventing the first pin P1 from falling off. Similarly, the cylindrical body P3B of the third pin P3 is inserted through both the second link opening LH2 formed to penetrate the second link 122 and the third opening H3 formed to penetrate the second cutting blade 112, thereby connecting the second link 122 and the second cutting blade 112. A second stopper ST2 is disposed to the left of the end face P3S of the third pin P3, thereby preventing the third pin P3 from falling off.

[0055] As shown in FIG. 3B, the cylindrical body P2B of the second pin P2 is inserted through both the first frame opening FH1 formed to penetrate the pair of frame parts 11F and the second opening H2 formed to penetrate the first cutting blade 111, thereby connecting the frame part 11F and the first cutting blade 111. A third stopper ST3 is disposed to the left of the end face P2S of the second pin P2, thereby preventing the second pin P2 from falling off. Similarly, the cylindrical body P4B of the fourth pin P4 is inserted through both the second frame opening FH2 formed to penetrate the frame part 11F and the fourth opening H4 formed to penetrate the second cutting blade 112, thereby connecting the frame part 11F and the second cutting blade 112. A third stopper ST3 is disposed to the left of the end face P4S of the fourth pin P4, thereby preventing the fourth pin P4 from falling off.

[0056] In the cutting device 10 having the above-mentioned configuration, by opening and closing the pair of first cutting blade 111 and second cutting blade 112 as described above, it is possible to cut an object to be cut, such as reinforcing bars or electric wires.

[0057] Here, as shown in FIG. 1B, the first cutting blade 111E and the second cutting blade 112E of the first cutting blade 111 and the second cutting blade 112 arranged opposite each other in the Z-axis direction can move on the XZ imaginary plane IP1 and cut the workpiece by abutting or coming sufficiently close to each other.

[0058] With this configuration, it is possible to reduce the load acting on the cutting blades in the rotation axis direction (Y axis direction) and to reduce the need to improve the alignment accuracy of the two cutting blades in the rotation axis direction, compared to a cutting device that cuts an object by moving two cutting blades so that they intersect at a small interval. Therefore, it is possible to preferably adopt a configuration in which parts are connected with pins, as shown in this embodiment.

[0059] [How to replace the cutting blade] A method for replacing the cutting blade of the cutting device 10 will be described below with reference to Figures 4 to 9. As the cutting device 10 is used, the cutting blade gradually wears out or may become chipped or damaged, and therefore it is necessary to replace the old cutting blade with a new cutting blade.

[0060] 4, first, the male screws that attach the cover 11B to the housing body 11A are removed to remove the cover 11B from the housing body 11A. Then, as shown in the figure, the frame portion 11F and the third stopper ST3 that were hidden under the cover 11B are exposed.

[0061] Next, the male screw that attached the first stopper ST1 to the first link 121 is loosened, and the leaf spring of the first stopper ST1 is moved from the position facing the end face P1S formed on the flange portion of the first pin P1 to a different position. Similarly, the male screw that attached the second stopper ST2 to the second link 122 is loosened, and the leaf spring of the second stopper ST2 is moved from the position facing the end face P2S formed on the flange portion of the second pin P2 to a different position. Then, as shown in FIG. 5, the end face P1S of the first pin P1 and the end face P3S of the third pin P3 are exposed.

[0062] 6, the first pin P1 and the third pin P3 are moved in the negative direction of the Y axis to remove (disengage) the first pin P1 from the first link 121 and the first cutting blade 111, and the third pin P3 is removed (disengaged) from the second link 122 and the second cutting blade 112. This releases the connection between the first link 121 and the first cutting blade 111, and releases the connection between the second link 122 and the second cutting blade 112.

[0063] Next, the male screw that attached the third stopper ST3 to the frame portion 11F is loosened, and the two protrusions of the third stopper ST3 are moved from the positions facing the end face P2S formed on the flange portion of the second pin P2 and the end face P4S formed on the flange portion of the fourth pin P4 to different positions, whereby the end face P2S of the second pin P2 and the end face P4S of the fourth pin P4 are exposed, as shown in FIG.

[0064] 8, the second pin P2 and the fourth pin P4 are moved in the negative direction of the Y axis to remove (disengage) the second pin P2 from the first cutting blade 111 and the frame portion 11F, and the fourth pin P4 is removed (disengaged) from the second cutting blade 112 and the frame portion 11F. This releases the connection between the frame portion 11F and the first cutting blade 111, and releases the connection between the frame portion 11F and the second cutting blade 112.

[0065] As a result, the first cutting blade 111 is separated from the frame portion 11F and the first link 121. Similarly, the second cutting blade 112 is separated from the frame portion 11F and the second link 122. Therefore, as shown in Fig. 9, the first cutting blade 111 and the second cutting blade 112 can be removed from the front.

[0066] Thereafter, new first cutting blade 111 and second cutting blade 112 can be attached to the cutting device 10 by performing the above-described procedures in reverse.

[0067] As described above, the cutting device 10 allows for easier replacement of the cutting blade compared to when the cutting blade is attached with a bolt and nut. In particular, in order to secure the bolt with a nut after inserting it, work must be done from the opposite side to the insertion side, but the cutting device 10 allows for easy replacement of the cutting blade by removing the cover 11B that constitutes one side of the housing 11 (the side on which the first pin P1 and the like are pulled out, and may also be called the "insertion side") and working from the removed side.

[0068] The cutting device 10 disclosed in this embodiment can be modified as appropriate. For example, the cutting device 10 includes a ball screw mechanism using an electric motor 400 as an actuator of the moving member 230 for rotating the first link 121 and the second link 122 by being connected to both links. However, the configuration for driving the moving member 230 in the forward and backward directions is not limited to this, and for example, a configuration may be adopted in which compressed air or hydraulic pressure is used as an actuator to drive a piston serving as the moving member 230 in the forward and backward directions.

[0069] In the present embodiment, in the links such as the first link 121 and the frame portion 11F, an opening is formed in each of two spaced apart plate materials in order to stabilize the posture of the pins such as the first pin P1. However, the opening for inserting the pin may be a single opening.

[0070] In addition, in the cutting device 10 of this embodiment, a configuration is adopted in which a pair of links and cutting blades that are driven symmetrically are connected by inserting a pin therethrough, but a configuration may be adopted in which a pin is inserted through only one of the links and cutting blades. For example, in a cutting device in which one cutting blade is fixed and the other cutting blade moves to approach the first cutting blade to cut an object, a connection configuration similar to that of this embodiment may be adopted only for the configuration including the other moving cutting blade.

[0071] The cutting blade may also be made up of multiple components. For example, the cutting blade may include an adjustment component (such as an adjustment screw) for finely adjusting the position of the cutting blade.

[0072] Furthermore, a connection configuration similar to that of this embodiment may be adopted for connecting the moving member 230 to the first link 121 and / or the second link 122.

[0073] The present invention can be modified in various ways without departing from the spirit of the present invention. For example, some components in one embodiment can be added to other embodiments within the scope of ordinary creativity of a person skilled in the art. Also, some components in one embodiment can be replaced with corresponding components in other embodiments.

[0074] [Second embodiment] Hereinafter, different embodiments of the cutting device will be described, with the same reference numerals being used for configurations similar to those of the other embodiments, and detailed descriptions thereof will be omitted, and the description will focus on the differences.

[0075] The cutting device of this embodiment includes a first movement restricting member and a second movement restricting member on the inner wall surface of the cover 11B, instead of the first stopper ST1 to the third stopper ST3.

[0076] 10A and 10B are cross-sectional views of the cutting device according to the present embodiment taken along lines corresponding to the sections AA and BB in FIG. 2. In FIG.

[0077] As shown in FIG. 10A, the cover 61B of this embodiment has a first convex portion 61B1 (an example of a “first movement restricting member”) formed to protrude inward from the inner wall surface and provided at a position opposite the end face P1S of the first pin P1, and a second convex portion 61B2 (an example of a “first movement restricting member”) also formed to protrude inward from the inner wall surface and provided at a position opposite the end face P3S of the third pin P3.

[0078] This configuration also makes it possible to prevent the first pin P1 and the third pin P3 from falling off.

[0079] Furthermore, as shown in FIG. 10B, the cover 61B of this embodiment has a portion 61B3 (an example of a “first movement control member”) having an inner wall surface 61B3S provided in a position closely facing the end face P2S of the second pin P2 and / or the end face P4S of the fourth pin P4, thereby making it possible to prevent the second pin P2 and / or the fourth pin P4 from falling off.

[0080] In addition, the first pin P1 to the fourth pin P4 can be removed by removing the cover 61B, which further simplifies the replacement operation.

[0081] As a further modification, the cover 61B may be integrated with at least one of the first pin P1 to the fourth pin P4 (for example, the first pin P1 and the third pin P3). With such a configuration, it is possible to simplify the operation of removing the first pin P1 to the fourth pin P4.

[0082] The first pin P1 to the fourth pin P4 do not have to have a flange. Even if they do not have a flange, it is possible to restrict movement in the positive direction of the Y axis by forming an inner wall surface of the housing body 11A at a position facing the tip surface of the first pin P1 to the fourth pin P4. Furthermore, it goes without saying that a groove may be formed around the pin instead of a flange, and a (known) E-ring or C-ring may be attached to the groove to exert the same effect of restricting movement as a flange.

[0083] Moreover, the main body portions of the first pin P1 to the fourth pin P4 may have uneven surfaces on the side surfaces, like a bolt having a male thread, instead of a cylindrical surface.

[0084] Furthermore, the cutting device 10 may have only one of the first pin P1 to the fourth pin P4 (for example, the first pin P1), and the parts connected by the other pins (for example, the second pin P2 to the fourth pin P4) may have a configuration similar to that of the conventional ones.

[0085] For example, the cutting device 10 may be configured to include a first pin P1 and a third pin P3, and corresponding first stopper ST1 and second stopper ST2, but not include the second pin P2, the fourth pin P4, or the third stopper ST3.

[0086] The second pin P2 and the fourth pin P4 of the cutting device 10 may be a common pin. In this case, the second pin P2 is inserted through the fourth opening H4 in addition to the second opening H2 and the opening of the frame portion 11F at the center position in the Z axis direction. The opening of the frame portion 11F is formed at the center position in the Z axis direction. The second opening H2 and the fourth opening H4 are arranged to overlap at the center position in the Z axis direction. With this configuration, the second pin P2 can rotatably connect the second cutting blade 112 to the frame portion 11F.

[0087] In the above embodiment, the first and second movement restricting members, i.e., the first stopper ST1, the second stopper ST2 and the third stopper ST3, etc., are provided at positions facing the end faces of the rear ends of the first pins P1, etc., thereby restricting the movement of the first pins P1, etc. in the detachment direction. However, other means for restricting the movement of the first pins P1, etc. in the detachment direction by being arranged to be engageable with the rear ends of the first pins P1, etc. (including a mode in which the means is normally spaced apart from the shaft member of the first pins P1, etc., and comes into contact with the shaft member when the shaft member moves in the detachment direction) may also be used as the movement restricting means. [Explanation of symbols]

[0088] 10 Cutting device 11. Housing 11A Housing body 11B Cover 11F Frame section 12 Trigger switch 61B Cover 61B1 First protrusion (first movement restricting member) 61B2 Second protrusion (first movement restricting member) 111 1st cutting blade 112 2nd cutting blade 121 First link 122 Second Link 230 Moving parts 300 reducer 400 Electric Motor 600 Battery 700 Guide Plate FH1 First frame opening FH2 2nd frame opening H1 1st opening H2 2nd opening H3 3rd opening H4 4th opening P1 First pin (first shaft member) P2 Second pin (second shaft member) P3 3rd pin (3rd shaft member) P4 4th pin (4th shaft member) ST1 First stopper (first movement restricting member) ST2 Second stopper (first movement restricting member) ST3 Third stopper (second movement restricting member)

Claims

1. a first cutting blade having a first opening and a second opening; a first link having an opening formed therein; A frame having an opening; at least one of a first shaft member that is inserted through the first opening and an opening of the first link to rotatably connect the first cutting blade to the first link, and a second shaft member that is inserted through the second opening and an opening of the frame to rotatably connect the first cutting blade to the frame; at least one of a first movement restricting member that is disposed at a rear end of the first shaft member that is inserted through the first opening and the opening of the first link, thereby restricting the first shaft member from moving in a direction away from the first opening, and a second movement restricting member that is disposed at a rear end of the second shaft member that is inserted through the second opening and the opening of the frame, thereby restricting the second shaft member from moving in a direction away from the second opening; A cutting device comprising:

2. the first movement restricting member is disposed opposite to an end surface of the first shaft member to restrict the first shaft member from moving in a direction in which the first shaft member is removed from the first opening, The second movement restricting member is disposed opposite to an end surface of the second shaft member to restrict the second shaft member from moving in a direction in which the second shaft member is removed from the second opening.

2. The cutting device of claim 1.

3. The first shaft member is a first body portion having a cylindrical surface formed to be able to pass through the first opening and the opening of the first link, and a first flange portion formed by expanding the diameter of the first body portion, The second shaft member is The second body portion has a cylindrical surface formed to be able to pass through the second opening and the opening of the frame, and a second flange portion formed by expanding the diameter of the second body portion.

2. The cutting device of claim 1.

4. The first movement restricting member is provided on at least one of the first cutting blade and the first link, The second movement restricting member is provided on the frame.

4. Cutting device according to any one of the preceding claims.

5. The cutting device according to claim 1 , further comprising a cover on which the first movement restricting member and the second movement restricting member are provided.

6. The cutting device of claim 5 , wherein the cover further comprises the first shaft member and the second shaft member.

7. The frame is formed with a plurality of openings, a second cutting blade having a third opening and a fourth opening; a second link having an opening formed therein; a third shaft member that is inserted through the third opening and an opening of the second link to rotatably connect the second cutting blade to the second link; a fourth shaft member that is inserted through the fourth opening and the other opening of the frame to rotatably connect the second cutting blade to the frame.

2. The cutting device of claim 1.

8. The third shaft member is a third main body portion having a cylindrical surface formed to be able to pass through the third opening and the opening of the second link; and a third flange portion formed by expanding the diameter of the third main body portion, The fourth shaft member is a fourth body portion having a cylindrical surface formed to be able to pass through the fourth opening and other openings of the frame; and a fourth flange portion formed by expanding the diameter of the fourth body portion.

8. The cutting device according to claim 7.

9. a moving member connected to each of the first link and the second link and configured to be movable in a predetermined direction; An actuator that moves the moving member in a predetermined direction, As the moving member moves in the predetermined direction, the first link and the second link each rotate, and the first cutting blade connected to the first link via the first shaft member rotates about the second shaft member as a fulcrum, and the second cutting blade connected to the second link via the third shaft member rotates about the fourth shaft member as a fulcrum, so that the cutting edge of the first cutting blade and the cutting edge of the second cutting blade move in directions approaching each other.

8. The cutting device according to claim 7.

10. a second cutting blade having a third opening and a fourth opening formed therein; a second link having an opening formed therein; a third shaft member that is inserted through the third opening and the opening of the second link to rotatably connect the second cutting blade to the second link; The second shaft member is further inserted into the fourth opening to rotatably connect the second cutting blade to the frame.

2. The cutting device of claim 1.

Images