Electric scissors

Abstract

To provide electric scissors which can hold a cut object and restrict a direction of the cut object relative to a movable blade with a simple structure.SOLUTION: Electric scissors 1A include: a first movable blade 2A having a blade part 20A for cutting a steel bar S and a second movable blade 2B having a blade part 20B; a first support part 4A provided at a side part of one of the first movable blade 2A and the second movable blade 2B and having a groove part 40A configured to support the steel bar S while restricting a direction of the steel bar S; and a second support part 4B provided at a side part of the other of the first movable blade 2A and the second movable blade 2B and having a groove part 40B configured to support the steel bar S while restricting a direction of the steel bar S.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to electric scissors that use the driving force of a motor to cut materials such as reinforcing bars. [Background technology]

[0002] FIG. 16 is an explanatory diagram showing an example of the arrangement of reinforcing bars in a concrete structure. Reinforcing bars are used in concrete structures to increase their strength. Reinforcing bars S are arranged in a lattice pattern as shown in FIG. 16, and their intersections are tied together with wire. At construction sites, ends E1 of reinforcing bars S arranged in this manner may be cut. Also, two of the lattice points E2 may be cut at four locations to allow for the passage of pipes, etc.

[0003] Scissors that use a pair of movable blades to cut round bar-shaped objects have a structure in which the sharp cutting edges push the round bar in the radial direction to cut it. In the process of cutting the round bar with the pair of movable blades, a cutting load acting perpendicular to the elongation direction of the round bar and a load that tears the round bar in the elongation direction of the round bar, which is perpendicular to the cutting load, are generated.

[0004] Conventional scissors cannot prevent the movement of the round bar due to the load that tears the round bar in a direction perpendicular to the cutting load. As a result, when the cutting point of the reinforcing bar S arranged as shown in Figure 16 is cut with a pair of movable blades, a force is applied that tries to move the reinforcing bar S in the extension direction, causing the cut reinforcing bar S to fly apart.

[0005] In response to this, a technology has been disclosed for nippers that are opened and closed manually to cut relatively thin wires such as electric wires and wires, in which the cutting blade is equipped with a wire clamping member that holds the wire with elastic force to prevent the cut wire from scattering as the object to be cut (see, for example, Patent Document 1).

[0006] On the other hand, when cutting rebar or a large-diameter round bar, a larger cutting force is required. As mentioned above, when cutting a round bar with a pair of movable blades, a reaction force of the cutting load acting perpendicular to the elongation direction of the round bar is applied to the movable blade. Therefore, when a larger cutting force is applied, the scissors tilt relative to the round bar. Therefore, the operator needs to hold the scissors to prevent them from tilting.

[0007] Therefore, a technique has been disclosed in which pressing members are provided on both sides of the cutting blade to hold the pipe, which is the object to be cut, by the bias of a torsion spring, thereby preventing the pipe from becoming slanted (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Utility Model Application Publication No. 64-43865 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-87642 Summary of the Invention [Problem to be solved by the invention]

[0009] However, in a configuration in which the force of a spring is used to hold down the workpiece, a stronger torsion spring is required to cut a large diameter round bar, which increases the size of the tool and makes it difficult to operate.

[0010] The present invention has been made to solve such problems, and aims to provide electric scissors that can hold an object to be cut and can regulate the orientation of the object relative to the movable blade with a simple configuration. [Means for solving the problem]

[0011] In order to solve the above-mentioned problems, the present invention provides a cutting tool comprising a movable blade having a blade portion for cutting an object to be cut, a drive unit for opening and closing the movable blade, and a support unit for supporting the object to be cut by the movable blade while regulating the orientation of the object to be cut, wherein the support unit is a plate-shaped member having a groove portion for receiving the object to be cut, which is fixed to a housing, and the movable blade is a pair of first and second movable blades rotatably supported by respective shafts supported by the support unit, In the standby state, a gap is formed between the blade portion of the first movable blade and the blade portion of the second movable blade, allowing the object to be cut to fit therein; The groove portion is The opening width is configured to the length that matches the material to be cut, The blade has a pair of surfaces that face each other in the opening and closing direction of the first movable blade and the second movable blade, and is provided in a space between the first movable blade and the second movable blade when the first movable blade and the second movable blade rotate in the direction in which they move apart and open. When the first movable blade and the second movable blade are in a standby state and an object to be cut is placed in the groove, the object to be cut enters between the blade portion of the first movable blade and the blade portion of the second movable blade. It is an electric scissors. The present invention also provides an electric cutting device, which includes a pair of cutting blades that sandwich and cut an object to be cut, a motor that receives electricity and generates the driving force required to operate the cutting blades, and a guide plate that has a recess formed therein for accommodating the object to be cut when the object is cut by the pair of cutting blades, the guide plate having a pair of plate-like portions that sandwich the cutting blades therebetween and fixed to a housing. The cutting blades are a pair of first and second movable blades rotatably supported by respective shafts supported by a guide plate, and in a standby state, a gap is formed between the blade portion of the first movable blade and the blade portion of the second movable blade, into which the object to be cut enters, and the recess has an opening width configured to a length that matches the object to be cut, and when the first and second movable blades are in a standby state and an object to be cut is placed in the recess, the object to be cut enters between the blade portion of the first movable blade and the blade portion of the second movable blade. It is an electric scissors.

[0012] In the present invention, the object is cut by the movable blade in a state in which the orientation of the object is regulated by the support portion. [Effects of the Invention]

[0013] In the present invention, tilting of the object to be cut relative to the movable blade is suppressed during the process of cutting the object with the movable blade, thereby suppressing tilting of the electric scissors relative to the object to be cut. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a partially cutaway perspective view showing an example of electric scissors according to an embodiment of the present invention. [Figure 2] 1 is an exploded perspective view of a main part showing an example of electric scissors according to an embodiment of the present invention. [Figure 3] 1 is a side cross-sectional view showing an example of electric scissors according to an embodiment of the present invention. [Figure 4]1 is a side view showing an example of electric scissors according to an embodiment of the present invention. [Figure 5] 1 is a top view showing an example of electric scissors according to an embodiment of the present invention. FIG. [Figure 6] 1 is a front view showing an example of electric scissors according to an embodiment of the present invention. [Figure 7] 5 is a cross-sectional view taken along line AA in FIG. 4, showing an example of the electric scissors according to the present embodiment. [Figure 8A] 1 is a side cross-sectional view of a main part showing an example of the operation of the electric scissors of the present embodiment. FIG. [Figure 8B] 8B is a cross-sectional view taken along line BB in FIG. 8A, showing an example of the operation of the electric scissors according to the present embodiment. [Figure 9A] 1 is a side cross-sectional view of a main part showing an example of the operation of the electric scissors of the present embodiment. FIG. [Figure 9B] 9B is a cross-sectional view taken along line CC in FIG. 9A, showing an example of the operation of the electric scissors according to the present embodiment. [Figure 10] 1 is a side view of a main part showing an example of the operation of the electric scissors of the present embodiment. FIG. [Figure 11A] FIG. 1 is a side view of a main part of electric scissors illustrating a conventional problem. [Figure 11B] FIG. 11B is a cross-sectional view taken along line DD in FIG. 11A, illustrating a problem in the related art. [Figure 12] FIG. 10 is a front cross-sectional view showing a second modified example of the electric scissors of the present embodiment. [Figure 13] FIG. 10 is a front cross-sectional view showing a third modified example of the electric scissors of the present embodiment. [Figure 14] FIG. 10 is a front cross-sectional view showing a fourth modified example of the electric scissors of the present embodiment. [Figure 15] FIG. 10 is a front cross-sectional view showing a fifth modified example of the electric scissors of the present embodiment. [Figure 16] FIG. 1 is an explanatory diagram showing an example of the arrangement of reinforcing bars in a concrete structure. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the electric scissors of the present invention will be described with reference to the drawings.

[0016] <Example of electric scissors configuration> Fig. 1 is a partially cutaway perspective view showing an example of electric scissors according to the present embodiment, Fig. 2 is an exploded perspective view showing a main part of an example of electric scissors according to the present embodiment, Fig. 3 is a side cross-sectional view showing an example of electric scissors according to the present embodiment, Fig. 4 is a side view showing an example of electric scissors according to the present embodiment, Fig. 5 is a top view showing an example of electric scissors according to the present embodiment, Fig. 6 is a front view showing an example of electric scissors according to the present embodiment, and Fig. 7 is a cross-sectional view taken along line AA in Fig. 4 showing an example of electric scissors according to the present embodiment.

[0017] Electric scissors 1A of this embodiment include a pair of movable blades, a first movable blade 2A and a second movable blade 2B, a first holding portion 3A and a second holding portion 3B that hold a reinforcing bar S, which is an object to be cut by the first movable blade 2A and the second movable blade 2B, and a first support portion 4A and a second support portion 4B that suppress inclination of the reinforcing bar S relative to the first movable blade 2A and the second movable blade 2B and suppress deformation of the first holding portion 3A and the second holding portion 3B in directions other than the desired direction. Electric scissors 1A also includes a drive unit 5 that drives the first movable blade 2A and the second movable blade 2B.

[0018] The first movable blade 2A is a plate-like member of a predetermined shape made of steel or the like, and is provided with a blade portion 20A having a wedge-shaped cross section toward one side and an acute cutting edge. The second movable blade 2B is a plate-like member of a predetermined shape made of steel or the like, and is provided with a blade portion 20B having a wedge-shaped cross section toward one side and an acute cutting edge.

[0019] The first movable blade 2A is rotatably supported on a shaft 21A that is supported by a first support portion 4A and a second support portion 4B. The first movable blade 2A is formed with a shaft hole portion 22A into which the shaft 21A is inserted, a blade portion 20A is formed on one side of the shaft hole portion 22A, and a link portion 23A that is connected to the drive portion 5 is formed on the other side of the shaft hole portion 22A.

[0020] The second movable blade 2B is rotatably supported on a shaft 21B that is supported by the first support portion 4A and the second support portion 4B in a direction parallel to the shaft 21A. The second movable blade 2B is formed with a shaft hole portion 22B into which the shaft 21B is inserted, a blade portion 20B is formed on one side of the shaft hole portion 22B, and a link portion 23B that is connected to the drive portion 5 is formed on the other side of the shaft hole portion 22B.

[0021] The first movable blade 2A and the second movable blade 2B have blade portion 20A extending in the direction parallel to the direction of extension of blade portion 20B. Furthermore, the first movable blade 2A and the second movable blade 2B have blade portion 20A positioned along the axial direction of shaft 21A and blade portion 20B positioned along the axial direction of shaft 21B overlapping.

[0022] The first movable blade 2A rotates around the shaft 21A as a fulcrum, and the blade portion 20A moves toward and away from the blade portion 20B of the second movable blade 2B. The second movable blade 2B also rotates around the shaft 21B as a fulcrum, and the blade portion 20B moves toward and away from the blade portion 20A of the first movable blade 2A.

[0023] As the first movable blade 2A and the second movable blade 2B move in directions away from each other, a gap into which the rebar S can be inserted is formed between the blade portion 20A of the first movable blade 2A and the blade portion 20B of the second movable blade 2B. As the first movable blade 2A and the second movable blade 2B move in directions toward each other, the blade portion 20A of the first movable blade 2A and the blade portion 20B of the second movable blade 2B come into contact with each other.

[0024] The first retaining portion 3A is made of an elastic material. The first retaining portion 3A is attached to the first movable blade 2A in a manner that the portion facing the blade portion 20A of the first movable blade 2A is open and covers both sides of the first movable blade 2A and the back portion opposite the blade portion 20A, and is linked to the opening and closing of the first retaining portion 3A. The first retaining portion 3A may be provided on both sides of the first movable blade 2A along a direction perpendicular to the opening and closing direction of the first movable blade 2A, or may be provided on one side.

[0025] The first retaining portion 3A has an inner surface facing the blade portion 20A of the first movable blade 2A that has a wedge-shaped cross section, and has a recess 30A formed on the outer surface facing the first support portion 4A and the second support portion 4B, which assists the elastic deformation and restoration of the first retaining portion 3A.

[0026] The second holding portion 3B is made of an elastic material. The second holding portion 3B is attached to the second movable blade 2B in a manner that the portion facing the blade portion 20B of the second movable blade 2B is open and covers both sides of the second movable blade 2B and the back portion opposite the blade portion 20B, and is linked to the opening and closing of the second holding portion 3B. The second holding portion 3B may be provided on both sides of the second movable blade 2B along a direction perpendicular to the opening and closing direction of the second movable blade 2B, or on one side.

[0027] The second retaining portion 3B has an inner surface facing the blade portion 20B of the second movable blade 2B that has a wedge-shaped cross section, and has a recess 30B formed on the outer surface facing the first support portion 4A and the second support portion 4B, which assists the elastic deformation and restoration of the second retaining portion 3B.

[0028] The surface of the first retaining portion 3A that faces the second retaining portion 3B attached to the second movable blade 2B is positioned approximately equal to the blade portion 20A of the first movable blade 2A. The first movable blade 2A protrudes from the first retaining portion 3A as a result of the first retaining portion 3A elastically deforming. The surface of the second retaining portion 3B that faces the first retaining portion 3A attached to the first movable blade 2A is positioned approximately equal to the blade portion 20B of the second movable blade 2B as a result of the second retaining portion 3B elastically deforming.

[0029] The first holding part 3A and the second holding part 3B may be made of urethane, nitrile rubber, chloroprene rubber, ethylene rubber, butyl rubber, fluororubber, silicone rubber, high-strength silicone rubber, etc., and urethane is preferable in view of the compressive stress, hardness, friction coefficient, etc. of the elastic body.

[0030] The first support part 4A and the second support part 4B are made of a metal plate such as iron. The first support part 4A has a groove part 40A into which the reinforcing bar S is placed. The opening width L of the groove part 40A is configured to be slightly larger than the diameter of the reinforcing bar S that can be cut (see Figure 4). The second support part 4B has a groove part 40B into which the reinforcing bar S is placed. The opening width L of the groove part 40B is the same as the width of the groove part 40A, and is configured to be slightly larger than the diameter of the reinforcing bar S that can be cut.

[0031] The first support part 4A and the second support part 4B are fixed to the housing 10 while maintaining the distance between them by inserting a connecting member 41A between them and fixing them to the connecting member 41A with screws 41B.

[0032] Groove 40A of first support portion 4A and groove 40B of second support portion 4B are provided at positions along the axial direction of shaft 21A and shaft 21B with respect to the space between blade portion 20A and blade portion 20B that are opened when first movable blade 2A and second movable blade 2B rotate in the direction away from each other. As a result, rebar S placed between groove 40A of first support portion 4A and groove 40B of second support portion 4B is placed between blade portion 20A of first movable blade 2A and blade portion 20B of second movable blade 2B in the opened state.

[0033] The first support portion 4A is provided at a position facing one side surface of the first movable blade 2A and the first holder 3A perpendicular to the opening / closing direction and one side surface of the second movable blade 2B and the second holder 3B perpendicular to the opening / closing direction. The second support portion 4B is provided at a position facing the other side surface of the first movable blade 2A and the first holder 3A and the other side surface of the second movable blade 2B and the second holder 3B. The distance between the first support portion 4A and the second support portion 4B is configured to be approximately equal to the width of the first holder 3A along the axial direction of the shaft 21A and the width of the second holder 3B along the axial direction of the shaft 21B, and the first support portion 4A contacts one side surface of the first holder 3A and the second holder 3B. Further, the second support portion 4B contacts the other side surfaces of the first holding portion 3A and the second holding portion 3B.

[0034] The first support part 4A has holes 42A and 43A into which one ends of the shafts 21A and 21B are inserted, and the second support part 4B has holes 42B and 43B into which the other ends of the shafts 21A and 21B are inserted.

[0035] Shafts 21A and 21B are fixed in a manner that prevents them from coming off first support portion 4A and second support portion 4B by E-ring 24. As a result, both axial ends of shafts 21A and 21B are supported by first support portion 4A and second support portion 4B, and tilting of the axes between shafts 21A and 21B is suppressed.

[0036] The drive unit 5 includes a motor 50, a reducer 51, a feed screw mechanism 52, and a toggle link mechanism 53. The drive shaft of the motor 50 is connected to the reducer 51, which uses, for example, a planetary gear. The feed screw mechanism 52 includes a screw shaft 52A connected to the output shaft of the reducer 51, and a moving member 52B having a convex portion (not shown) that meshes with the thread groove of the screw shaft 52A.

[0037] When the screw shaft 52A of the feed screw mechanism 52 is rotationally driven, the moving member 52B moves linearly along the screw shaft 52A. As a result, the feed screw mechanism 52 converts the rotational movement of the motor 50 into linear movement of the moving member 52B, and the moving direction of the moving member 52B is switched depending on the rotational direction of the motor 50.

[0038] The toggle link mechanism 53 includes a link portion 54A rotatably connected to the link portion 23A of the first movable blade 2A, a link portion 54B rotatably connected to the link portion 23B of the second movable blade 2B, and a link portion 54C connecting the link portion 54A and the link portion 54B to the movable member 52B.

[0039] Link portion 23A and link portion 54A are rotatably connected to each other around shaft 55A. Link portion 23B and link portion 54B are rotatably connected to each other around shaft 55B. Link portion 54A, link portion 54B, and link portion 54C are rotatably connected to each other around shaft 55C, and link portion 54C and moving member 52B are rotatably connected to each other around shaft 55D.

[0040] Depending on the position of the movable member 52B, the toggle link mechanism 53 is configured such that the link portion 23A and the link portion 54A of the first movable blade 2A are bent at the connecting portion formed by the axis 55A, and the link portion 23B and the link portion 54B of the second movable blade 2B are bent at the connecting portion formed by the axis 55B.

[0041] In the first movable blade 2A and the second movable blade 2B, the link portion 23A and the link portion 54A are bent at the connection portion of the shaft 55A, and the link portion 23B and the link portion 54B are bent at the connection portion of the shaft 55B. When the angle formed by the link portion 23A and the link portion 54A and the angle formed by the link portion 23B and the link portion 54B in the first movable blade 2A and the second movable blade 2B are opened, a gap is formed between the blade portion 20A and the blade portion 20B so that the rebar S can be inserted therein.

[0042] In toggle link mechanism 53, as moving member 52B moves, the angle formed between link portion 23A and link portion 54A at the connection portion by shaft 55A closes, and the angle formed between link portion 23B and link portion 54B at the connection portion by shaft 55B closes.

[0043] When the first movable blade 2A rotates around axis 21A as a fulcrum in the direction of closing the angle between link portion 23A and link portion 54A, and the second movable blade 2B rotates around axis 21B as a fulcrum in the direction of closing the angle between link portion 23B and link portion 54B, the blade portions of the first movable blade 2A and the second movable blade 2B move in a direction in which they approach each other, and blade portion 20A and blade portion 20B come into contact.

[0044] The electric scissors 1A include an operating unit 11 that opens and closes the first movable blade 2A and the second movable blade 2B. The operating unit 11 includes a first switch 11A and a second switch 11B that control the direction, amount, and speed of rotation of the motor 50.

[0045] The electric scissors 1A may have a power supply unit such as a battery that supplies electricity to the motor 50 and other components provided separately from the electric scissors 1A, and the electric scissors 1A and the power supply unit connected by a cable. The electric scissors 1A may also have a configuration in which the power supply unit such as a battery that supplies electricity to the motor 50 and other components is detachably attached to the electric scissors 1A. In this case, the battery is detached from the electric scissors 1A and charged. The electric scissors 1A may also have a configuration in which the power supply unit such as a battery that supplies electricity to the motor 50 and other components is built into the electric scissors 1A. In this case, the power supply unit is charged by connecting the electric scissors 1A to a charger.

[0046] <Example of electric scissors in action> Fig. 8A is a side cross-sectional view of the main parts showing an example of the operation of electric scissors according to this embodiment, Fig. 8B is a cross-sectional view taken along line BB in Fig. 8A showing an example of the operation of electric scissors according to this embodiment, Fig. 9A is a side cross-sectional view of the main parts showing an example of the operation of electric scissors according to this embodiment, Fig. 9B is a cross-sectional view taken along line CC in Fig. 9A showing an example of the operation of electric scissors according to this embodiment, and Fig. 10 is a side view of the main parts showing an example of the operation of electric scissors according to this embodiment.

[0047] In the standby state of the electric scissors 1A, a gap is formed between the blade portion 20A of the first movable blade 2A and the blade portion 20B of the second movable blade 2B so that the rebar S can fit in. In this state, when the rebar S is placed in the groove portion 40A of the first support portion 4A and the groove portion 40B of the second support portion 4B as shown in Fig. 10, the rebar S is placed between the blade portion 20A of the first movable blade 2A and the blade portion 20B of the second movable blade 2B as shown in Fig. 8A and Fig. 8B.

[0048] When the first switch 11A of the operating unit 11 is operated with the rebar S placed between the blade portions 20A and 20B, the motor 50 rotates in a predetermined direction. The rotation of the motor 50 is converted into movement of the movable member 52B by the screw shaft 52A and movable member 52B of the feed screw mechanism 52, and the movement of the movable member 52B is transmitted to the first movable blade 2A and the second movable blade 2B by the toggle link mechanism 53. As a result, the first movable blade 2A rotates about the shaft 21A as a fulcrum, and the second movable blade 2B rotates about the shaft 21B as a fulcrum, so that the blade portion 20A of the first movable blade 2A and the blade portion 20B of the second movable blade 2B approach each other.

[0049] The first movable blade 2A and the second movable blade 2B move in a direction in which the blade portions 20A and 20B approach each other, so that the blade portion 20A pushes through the reinforcing bar S from one radial side of the reinforcing bar S, and the blade portion 20B pushes through the reinforcing bar S from the other radial side of the reinforcing bar S, thereby starting to cut the reinforcing bar S.

[0050] FIG. 11A is a side view of a main part of electric scissors showing the problem of the conventional art, and FIG. 11B is a cross-sectional view taken along line DD of FIG. 11A showing the problem of the conventional art.

[0051] During the process of cutting the reinforcing bar S with the first movable blade 2A and the second movable blade 2B, as shown in Figure 11B, a cutting load F1 acting perpendicular to the extension direction of the reinforcing bar S and a load F2 tearing the reinforcing bar S in the extension direction of the reinforcing bar S, which is perpendicular to the cutting load F1, are generated.

[0052] 11A and 11B, in a configuration in which the first movable blade 2A and the second movable blade 2B are not provided with holding portions, it is not possible to suppress the movement of the reinforcing bar S due to the load F2 that tears the reinforcing bar S in a direction perpendicular to the cutting load F1. As a result, the cut reinforcing bar S scatters.

[0053] In contrast, in a configuration in which the first movable blade 2A and the second movable blade 2B are provided with holding portions, in the process in which the blade portion 20A of the first movable blade 2A presses through the rebar S, the first holding portion 3A is pressed by the rebar S and elastically deforms, causing the blade portion 20A to protrude from the first holding portion 3A. Also, in the process in which the blade portion 20B of the second movable blade 2B presses through the rebar S, the second holding portion 3B is pressed by the rebar S and elastically deforms, causing the blade portion 20B to protrude from the second holding portion 3B.

[0054] Meanwhile, the first holding portion 3A uses its restoring force to push the rebar S radially from one side, and the second holding portion 3B uses its restoring force to push the rebar S radially from the other side. As a result, the first movable blade 2A and the second movable blade 2B rotate so that the blade portions 20A and 20B move in directions approaching each other, thereby sandwiching and holding the rebar S between the first holding portion 3A and the second holding portion 3B.

[0055] The first movable blade 2A and the second movable blade 2B move to a position where the blade portions 20A and 20B come into contact with each other, thereby cutting the reinforcing bar S. During the process of cutting the reinforcing bar S, the reinforcing bar S is sandwiched and held between the first holding portion 3A and the second holding portion 3B, so that the movement of the reinforcing bar S due to the load F2 that tears the reinforcing bar S in a direction perpendicular to the cutting load F1 is suppressed by the first holding portion 3A and the second holding portion 3B, as shown in Fig. 9B. This prevents the cut reinforcing bar S from scattering.

[0056] Furthermore, when the first holding portion 3A is pressed by the reinforcing bar S and elastically deforms in the process of the blade portion 20A pushing through the reinforcing bar S, if the first holding portion 3A deforms in a direction that bulges outward along the extension direction of the reinforcing bar S, the force with which the first holding portion 3A tries to restore its original shape will weaken the force with which it presses the reinforcing bar S in the radial direction from one side. Similarly, when the second holding portion 3B is pressed by the reinforcing bar S and elastically deforms in the process of the blade portion 20B pushing through the reinforcing bar S, if the second holding portion 3B deforms in a direction that bulges outward along the extension direction of the reinforcing bar S, the force with which the second holding portion 3B tries to restore its original shape will weaken the force with which it presses the reinforcing bar S in the radial direction from one side.

[0057] In contrast, the first support portion 4A is provided on one side of the first movable blade 2A to which the first holding portion 3A is attached and the second movable blade 2B to which the second holding portion 3B is attached, and the second support portion 4B is provided on the other side of the first movable blade 2A to which the first holding portion 3A is attached and the second movable blade 2B to which the second holding portion 3B is attached.

[0058] As a result, when the first holding portion 3A is pushed by the reinforcing bar S and elastically deforms as the blade portion 20A cuts through the reinforcing bar S, the deformation of the first support portion 4A, the second support portion 4B, and the recess 30A provided in the first holding portion 3A prevents the first holding portion 3A from deforming in a direction that bulges outward along the extension direction of the reinforcing bar S. Therefore, when the first holding portion 3A elastically deforms in a form that is compressed in a direction perpendicular to the extension direction of the reinforcing bar S, the force of the first holding portion 3A attempting to restore itself strengthens the force that presses the reinforcing bar S radially from one side.

[0059] Furthermore, when the second holding portion 3B is pressed by the reinforcing bar S and elastically deforms during the process in which the blade portion 20B cuts through the reinforcing bar S, the deformation of the first support portion 4A, the second support portion 4B, and the recess 30B provided in the second holding portion 3B prevents the second holding portion 3B from deforming in a direction that bulges outward along the extension direction of the reinforcing bar S. Therefore, when the second holding portion 3B elastically deforms in a form that is compressed in a direction perpendicular to the extension direction of the reinforcing bar S, the force of the second holding portion 3B attempting to restore itself strengthens the force that presses the reinforcing bar S radially from one side.

[0060] The material and hardness of the first holding portion 3A and the second holding portion 3B were selected in consideration of the compressive stress, hardness, friction coefficient, etc. of the elastic body, taking into account the optimum conditions such as the pressing force against the reinforcing bar S and the deformation state that does not interfere with the cutting of the reinforcing bar S. In this embodiment, urethane (hardness Hs 70°, compressive stress: 170 to 190 N / cm) was used as the material for the first holding portion 3A and the second holding portion 3B. 2 , dynamic friction coefficient: 0.624~0.648) was adopted.

[0061] Furthermore, in the process in which the blade portions 20A and 20B cut through the reinforcing bar S, a reaction force of the cutting load F1 acting in a direction perpendicular to the extension direction of the reinforcing bar S is applied to the first movable blade 2A and the second movable blade 2B. In a configuration that does not include the first support portion 4A and the second support portion 4B, the reinforcing bar S may tilt relative to each movable blade, causing the electric scissors to tilt relative to the reinforcing bar S. This requires the worker to hold the electric scissors so that they do not tilt, which places a burden on the worker.

[0062] In contrast, in a configuration in which a first support portion 4A having a groove portion 40A into which the reinforcing bar S fits is provided on one side of the first movable blade 2A and the second movable blade 2B, and a second support portion 4B having a groove portion 40B into which the reinforcing bar S fits is provided on the other side of the first movable blade 2A and the second movable blade 2B, the position of the reinforcing bar S is regulated on both sides of the first movable blade 2A and the second movable blade 2B along the axial direction of the axis 21A and the axis 21B.

[0063] As a result, even if the reaction force of the cutting load F1 acting perpendicular to the extension direction of the reinforcing bar S is applied to the first movable blade 2A and the second movable blade 2B, the reinforcing bar S is prevented from tilting relative to the first movable blade 2A and the second movable blade 2B, and the electric scissors 1A is prevented from tilting relative to the reinforcing bar S even without the operator having to apply force to hold the electric scissors 1A down to prevent it from tilting.

[0064] Therefore, a worker can hold the electric scissors 1A with one hand to cut the reinforcing bar S, and since the other hand is free, good workability can be ensured even when cutting at high places. Also, scattering of the cut reinforcing bar S can be suppressed. After cutting the reinforcing bar S, the first movable blade 2A and the second movable blade 2B can be kept closed by operating the operation unit 11, thereby maintaining the state in which the electric scissors 1A holds the reinforcing bar S. Therefore, by moving the electric scissors 1A to a disposal site while holding the cut reinforcing bar S and operating the operation unit 11 to open the first movable blade 2A and the second movable blade 2B, the reinforcing bar S can be disposed of at the disposal site, eliminating the need to collect the scattered reinforcing bar S and take it to the disposal site for disposal.

[0065] <Modified electric scissors> FIG. 12 is a front cross-sectional view showing a first modified example of the electric scissors of this embodiment. The electric scissors 1B of the first modified example have a holding part on one of a pair of movable blades, and no holding part on the other movable blade. That is, in the electric scissors 1B, the first movable blade 2A has a holding part 3A', and the second movable blade 2B has no holding part. Alternatively, although not shown, the second movable blade 2B has a holding part, and the first movable blade 2A has no holding part. The holding part 3A' may have the same configuration as the first holding part 3A described above.

[0066] In the electric scissors 1B, as the blade portion 20A of the first movable blade 2A and the blade portion 20B of the second movable blade 2B cut the reinforcing bar S, the holding portion 3A' is pushed by the reinforcing bar S and elastically deforms. Meanwhile, the holding portion 3A' pushes the reinforcing bar S radially from one side with its restoring force. As a result, when the blade portion 20A of the first movable blade 2A and the blade portion 20B of the second movable blade 2B move toward each other, the reinforcing bar S is sandwiched and held between the holding portion 3A' and the groove portion 40A of the first support portion 4A and the groove portion 40B of the second support portion 4B. This prevents the cut reinforcing bar S from scattering.

[0067] 13 is a front cross-sectional view showing a second modified example of the electric scissors of this embodiment. In the electric scissors 1C of the second modified example, the first holder 3A is equipped with a magnet 31A, and the second holder 3B is equipped with a magnet 31B, and the electric scissors 1C are constructed of magnetic members. Note that the entire first holder 3A and second holder 3B may be magnetic.

[0068] In the electric scissors 1C, in the process of cutting the reinforcing bar S with the blade portion 20A of the first movable blade 2A and the blade portion 20B of the second movable blade 2B, the first holding portion 3A is pushed by the reinforcing bar S and elastically deforms. Meanwhile, the first holding portion 3A pushes the reinforcing bar S radially from one side with its restoring force. Also, the second holding portion 3B is pushed by the reinforcing bar S and elastically deforms. Meanwhile, the second holding portion 3B pushes the reinforcing bar S radially from the other side with its restoring force. Furthermore, the magnet 31A of the first holding portion 3A is attracted to the reinforcing bar S, and the magnet 31B of the second holding portion 3B is attracted to the reinforcing bar S.

[0069] As a result, the first movable blade 2A and the second movable blade 2B rotate in a direction in which the blade portions 20A and 20B move closer to each other, and the rebar S is held between the first holding portion 3A and the second holding portion 3B by the elastic deformation of the first holding portion 3A and the second holding portion 3B and the magnets 31A and 31B. This prevents the cut rebar S from flying away.

[0070] 14 is a front cross-sectional view showing a third modified example of the electric scissors of this embodiment. In the electric scissors 1D of the third modified example, the position of the surface of the first holding part 3A that faces the second holding part 3B is variable relative to the cutting edge of the blade portion 20A of the first movable blade 2A in accordance with the diameter of the reinforcing bar S. Also, the position of the surface of the second holding part 3B that faces the first holding part 3A is variable relative to the cutting edge of the blade portion 20B of the second movable blade 2B in accordance with the diameter of the reinforcing bar S.

[0071] For example, when the diameter of the reinforcing bar S is large, the amount of retraction of the first holding portion 3A relative to the cutting edge of the cutting portion 20A of the first movable blade 2A is increased, and the amount of retraction of the second holding portion 3B relative to the cutting edge of the cutting portion 20B of the second movable blade 2B is increased, thereby widening the gap between the first holding portion 3A and the second holding portion 3B. On the other hand, when the diameter of the reinforcing bar S is small, the amount of retraction of the first holding portion 3A relative to the cutting edge of the cutting portion 20A of the first movable blade 2A is decreased, and the amount of retraction of the second holding portion 3B relative to the cutting edge of the cutting portion 20B of the second movable blade 2B is decreased, thereby narrowing the gap between the first holding portion 3A and the second holding portion 3B.

[0072] This prevents the amount of deformation when the first holding portion 3A and the second holding portion 3B elastically deform from becoming too large or too small, allowing the reinforcing bar S to be securely held, and also prevents the load when the first movable blade 2A and the second movable blade 2B rotate from becoming too large.

[0073] 15 is a front cross-sectional view showing a fourth modified example of the electric scissors 1E of the present embodiment. In the fourth modified example of the electric scissors 1E, the cutting edge of the cutting portion 20C of the first movable blade 2C and the cutting edge of the cutting portion 20D of the second movable blade 2D are formed at an obtuse angle.

[0074] In the process of cutting the reinforcing bar S with the first movable blade 2C and the second movable blade 2D, a cutting load F1 acting perpendicular to the extension direction of the reinforcing bar S and a load F2 that tears the reinforcing bar S in the extension direction of the reinforcing bar S, which is perpendicular to the cutting load F1, are generated. If the cutting edge of the blade portion 20C of the first movable blade 2C and the cutting edge of the blade portion 20D of the second movable blade 2D are made obtuse, the load F2 that tears the reinforcing bar S becomes sufficiently smaller than the cutting load F1. As a result, the cut reinforcing bar S falls along the movement direction of the movable blades, preventing it from scattering. [Explanation of symbols]

[0075] REFERENCE SIGNS 1A, 1B, 1C, 1D... Electric scissors, 2A, 2C... First movable blade, 2B, 2D... Second movable blade, 20A, 20B, 20C, 20D... Blade portion, 21A, 21A... Shaft, 22A, 22B... Shaft hole portion, 23A, 23B... Link portion, 24... E-ring, 3A... First holding portion, 3A'... Holding portion, 3B... Second holding portion, 30A, 30B... Recess, 31A, 31B... Magnet, 4A... First support portion, 4B... second support portion, 40A, 40B... groove portion, 41A... connecting member, 41B... screw, 42A, 42B... hole, 43A, 43B... hole, 5... drive portion, 50... motor, 51... reducer, 52... feed screw mechanism, 52A... screw shaft, 52B... moving member, 53... toggle link mechanism, 54A, 54B, 54C... link portion, 55A, 55B, 55C, 55D... shaft

Claims

1. a movable blade having a blade portion for cutting an object to be cut; a drive unit that opens and closes the movable blade; a support portion that supports the object to be cut by the movable blade while regulating the orientation of the object, The support portion is a plate-shaped member having a groove portion into which the workpiece is placed, and is fixed to a housing. The movable blade is configured such that a pair of first and second movable blades are rotatably supported by respective shafts supported by the support portion, and in a standby state, a gap is formed between the blade portion of the first movable blade and the blade portion of the second movable blade, allowing an object to be cut to fit therein; The groove portion has an opening width configured to a length that matches the object to be cut, has a pair of surfaces that face each other in the opening and closing direction of the first movable blade and the second movable blade, and is provided in a space between the first movable blade and the second movable blade that is opened by rotating in a direction in which the first movable blade and the second movable blade move away from each other, When the first movable blade and the second movable blade are in a standby state and an object to be cut is placed in the groove, the object to be cut enters between the blade portion of the first movable blade and the blade portion of the second movable blade. Electric scissors.

2. The support portions are provided on both sides of the first movable blade and the second movable blade along a direction perpendicular to the opening and closing direction of the first movable blade and the second movable blade. The electric scissors according to claim 1.

3. The support portion is disposed so that a space between the first movable blade and the second movable blade in an open state and the groove portion are aligned in a direction perpendicular to the opening and closing direction of the first movable blade and the second movable blade. The electric scissors according to claim 1 or 2.

4. The groove is formed in a U-shape. The electric scissors according to claim 1.

5. An electric cutting device, A pair of cutting blades that sandwich and cut the object to be cut; a motor that is supplied with electricity and generates a driving force necessary for the operation of the cutting blade; a guide plate having a recess formed therein for accommodating the object when the object is cut by the pair of cutting blades; the guide plate has a pair of plate-shaped portions sandwiching the cutting blade therebetween, and is fixed to the housing; The cutting blades are a pair of a first movable blade and a second movable blade, which are rotatably supported by respective shafts supported by the guide plate, and in a standby state, a gap is formed between the blade portion of the first movable blade and the blade portion of the second movable blade, into which the object to be cut can be inserted; The recess has an opening width that is configured to a length that matches the workpiece, When the first movable blade and the second movable blade are in a standby state and an object to be cut is placed in the recess, the object to be cut enters between the blade portion of the first movable blade and the blade portion of the second movable blade. Electric scissors.

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