bar cutting device

Abstract

To provide a bar cutting device that can effectively prevent unwanted loads from being placed on the bar material, and also effectively prevent damage to the cutting blade. [Solution] A rod cutting device for cutting a rod between a first portion and a second portion, comprising: a first gripping portion for gripping the first portion; a second gripping portion separate from the first gripping portion and movably provided with respect to the first gripping portion for gripping the second portion; and a cutting blade that is movable toward the rod to cut the rod between the first portion and the second portion, and also movable away from the rod after cutting, wherein, when the cutting blade is cutting the rod, the first gripping portion gripping the first portion and the second gripping portion gripping the second portion are biased in a direction away from each other.

Description

Technical Field

[0001] The present invention relates to a bar cutting device for cutting bars with a cutting blade, and more particularly to a reinforcing bar cutting device for cutting reinforcing bars with a cutting blade.

Background Art

[0002] As a reinforcing bar cutting device for cutting reinforcing bars with a cutting blade, for example, as described in Patent Document 1, various relatively large cutting devices have been developed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, at the site where cutting of reinforcing bars is required, there is a need for a relatively small cutting device.

[0005] While earnestly developing a cutting device for cutting a reinforcing bar between its first part and second part, the inventor of the present case has found that using both a first jig (first gripping part) for gripping the first part and a second jig (second gripping part) for gripping the second part is effective in securely holding the reinforcing bar during and after cutting.

[0006] And the inventor of the present case has now found that, when the cutting blade is cutting the reinforcing bar, by biasing the first jig (first gripping part) and the second jig (second gripping part) in a direction away from each other, it is possible to effectively prevent an undesired load from being applied to the reinforcing bar, and further, it is possible to extremely effectively prevent damage from occurring to the cutting blade.

[0007] This is thought to be because, while the cutting blade is cutting the reinforcing bar, the localized concentrated stress that would conventionally be trapped inside the cutting blade and the reinforcing bar is effectively released as the cutting of the reinforcing bar progresses.

[0008] While this finding is extremely useful in the context of reinforcing bars, it is not limited to reinforcing bars, at least at the time of this application (it can be extended to bar materials in general).

[0009] On the other hand, when cutting rebar using a gas torch instead of a cutting blade, the problem of localized concentrated stress accumulating inside the rebar is less likely to occur. However, when cutting rebar with a gas torch, the cut surface tends to be rougher, and separate finishing work is usually required.

[0010] This invention was conceived based on the above findings. The object of this invention is to provide a bar cutting device that can effectively prevent unwanted loads from being placed on the bar material and can also effectively prevent damage to the cutting blade. [Means for solving the problem]

[0011] The present invention relates to a rod cutting device for cutting a rod between a first portion and a second portion, comprising: a first gripping portion for gripping the first portion; a second gripping portion separate from the first gripping portion and movably mounted relative to the first gripping portion for gripping the second portion; and a cutting blade that is movable toward the rod to cut the rod between the first portion and the second portion, and also movable away from the rod after cutting, wherein, when the cutting blade is cutting the rod, the first gripping portion gripping the first portion and the second gripping portion gripping the second portion are biased in a direction away from each other.

[0012] According to the present invention, when the cutting blade is cutting the rod, the first gripping portion, which is gripping the first portion, and the second gripping portion, which is gripping the second portion, are biased in a direction away from each other. As a result, localized concentrated stress that would conventionally be trapped inside the cutting blade and the rod is effectively released as the cutting of the rod progresses. This effectively prevents unwanted loads from being placed on the rod, and furthermore, it is extremely effective in preventing damage to the cutting blade.

[0013] For example, the second gripping portion is provided on one side of the second gripping member, and a second biasing force acting portion is provided on the other side of the second gripping member, and a rotational allowance portion is provided between the second gripping portion and the second biasing force acting portion of the second gripping member to allow rotational movement of the second gripping portion relative to the first gripping portion.

[0014] According to this, despite its extremely simple configuration, the rotational movement of the second gripping member (second gripping part) provided by the rotation-allowing part can bias the second gripping part in a direction away from the first gripping part (after cutting, it moves in that direction).

[0015] Furthermore, in this case, it is preferable that the length between the second gripping portion and the rotation-allowing portion is longer than the length between the second biasing force acting portion and the rotation-allowing portion.

[0016] According to this, by the principle of leverage, the biasing force acting on the second biasing force application part can be amplified, causing the second gripping part to move away from the first gripping part.

[0017] Furthermore, in this case, with respect to the axis of the rod, it is preferable that the position where the cutting blade moves toward the rod and begins to cut the rod is on the opposite side from the rotation-allowing portion.

[0018] According to this method, localized concentrated stresses that would conventionally be trapped inside the cutting blade and the rod are effectively released from the initial stages of cutting the rod. This more effectively prevents unwanted loads from being placed on the rod and also more effectively prevents damage to the cutting blade.

[0019] In this case, it is preferable that the first gripping portion is provided on one side of the first gripping member, the other side of the first gripping member is provided with a first biasing force acting portion on which the biasing force acts, and a support portion is provided between the first gripping portion and the first biasing force acting portion of the first gripping member to support the rotation-allowing portion so as to be rotatable.

[0020] According to this, a configuration that biases the second gripping part away from the first gripping part can be realized in an extremely compact manner.

[0021] Furthermore, in the present invention, it is preferable that the biasing force is provided by the restoring force of the coil spring.

[0022] According to this, a configuration that biases the second gripping part away from the first gripping part can be realized in an extremely compact manner.

[0023] Furthermore, in this case, the first biasing force acting part and the second biasing force acting part are connected via a clamping mechanism and a coil spring, and it is preferable that the clamping mechanism is switchable between a biasing force activation position in which a restoring force by the coil spring is applied between the first biasing force acting part and the second biasing force acting part, and a biasing force release position in which no restoring force by the coil spring is applied between the first biasing force acting part and the second biasing force acting part.

[0024] According to this, when gripping the bar before cutting with the first gripping part and the second gripping part, the clamp mechanism is set in a state where the biasing force is released, and when starting cutting after gripping the bar with the first gripping part and the second gripping part, the clamp mechanism can be set in a state where it is switched to the biasing operation position. Thereby, in the operation of gripping the bar before cutting with the first gripping part and the second gripping part, no trouble occurs.

[0025] Note that at least at the time of filing the present application, the adoption of a biasing force other than a coil spring is not excluded. For example, a hydraulic drive system may be adopted.

[0026] Further, although the present invention is particularly effective when the bar is a reinforcing bar, at least at the time of filing the present application, it is not limited to reinforcing bars.

Effect of the Invention

[0027] According to the features of the present invention, in a state where the cutting blade is cutting the bar, the first gripping part gripping the first part and the second gripping part gripping the second part are biased in a direction away from each other, so that local concentrated stress that was trapped inside the cutting blade and the bar in the past is effectively released as the cutting of the bar progresses. Thereby, it is possible to effectively prevent an undesired load from being applied to the bar, and further, it is possible to extremely effectively prevent damage from occurring in the cutting blade.

Brief Description of the Drawings

[0028] [Figure 1] It is a plan view of a bar cutting device according to an embodiment of the present invention. [Figure 2] It is a bottom view of the bar cutting device of FIG. 1. [Figure 3] It is a partial side view of the bar cutting device of FIG. 1 in a state where the clamp mechanism is in the biasing force release position without gripping a reinforcing bar. [Figure 4] It is a partial side view of the bar cutting device of FIG. 1 in a state where the clamp mechanism is in the biasing operation position without gripping a reinforcing bar. [Figure 5]This is a partial side view of the bar cutting device shown in Figure 1, with the clamp mechanism in the biasing force release position while gripping the reinforcing bar. [Figure 6] This is a partial side view of the bar cutting device shown in Figure 1, with the clamp mechanism in the biasing force activation position while gripping the reinforcing bar. [Figure 7] This is a partial side view of the bar cutting device shown in Figure 1, with the clamping mechanism in the biasing force activation position after the reinforcing bar has been cut. [Modes for carrying out the invention]

[0029] Embodiments of the present invention will be described below with reference to the drawings.

[0030] Figure 1 is a plan view of a bar cutting device 1 according to one embodiment of the present invention (the cutting blade 40 is shown in the position where the rebar cutting is complete), and Figure 2 is a bottom view of the bar cutting device 1 according to this embodiment. Figure 3 is a partial side view of the bar cutting device 1 according to this embodiment with the clamp mechanism 30 in the biasing force release position when the rebar 50 is not being gripped, and Figure 4 is a partial side view of the bar cutting device 1 according to this embodiment with the clamp mechanism 30 in the biasing force activation position when the rebar 50 is not being gripped. Furthermore, Figure 5 is a partial side view of the bar cutting device 1 according to this embodiment with the clamp mechanism 30 in the biasing force release position when the rebar 50 is being gripped, and Figure 6 is a partial side view of the bar cutting device 1 according to this embodiment with the clamp mechanism 30 in the biasing force activation position when the rebar 50 is being gripped, and Figure 7 is a partial side view of the bar cutting device 1 according to this embodiment with the clamp mechanism 30 in the biasing force activation position after the rebar 50 has been cut.

[0031] As shown in Figures 1 to 7, the bar cutting device 1 of this embodiment is a bar cutting device that cuts between the first part 51 and the second part 52 of a reinforcing bar 50 (an example of a bar). The reinforcing bar 50 to be cut is, for example, about φ32 to 51.

[0032] (First gripping member 10) The bar cutting device 1 (reinforcement bar cutting device) is equipped with a first gripping part 11 that grips the first portion 51 of the reinforcement bar 50. In this embodiment, the first gripping part 11 is provided on one side of the first gripping member 10 (the left side in Figures 3 to 7), and grips / releases the first portion 51 of the reinforcement bar 50 by utilizing the movement of a clamp screw 12 as shown in the figure (in a direction substantially perpendicular to the axis of the reinforcement bar 50).

[0033] The height (thickness) of the first gripping member 10 is approximately 80 mm, and the clamp screw 12 is approximately φ24 mm and 80 mm long. The opposing wall 13 (see Figure 2) facing the tip of the clamp screw 12 has a central surface (innermost surface) parallel to the tip of the clamp screw 12 with a width of approximately 6 mm, and the left and right sides of this central surface extend outwards to form an obtuse angle of 120° with respect to the central surface.

[0034] Furthermore, in this embodiment, a shaft member 15 (for example, approximately φ30 mm) extending parallel to the axial direction of the reinforcing bar 50 is provided above the first gripping member 10, and a downward rotation-allowing projection 15p (an example of a support part) is provided on an auxiliary base 15s fixed to the upper end of the shaft member 15, which supports a downward rotation-allowing recess 25r (an example of a rotation-allowing part) (described later) in a rotatable manner. The downward rotation-allowing projection 15p is provided on the upper surface of the auxiliary base 15s so as to be movable in the left-right direction in Figures 3 to 7 (see Figures 5 to 7).

[0035] In this embodiment, the shape of the right-side region of the downward-rotatable projection 15p is generally a cylindrical curved surface (or part thereof) with a radius of R10, and the shape of the left-side region of the downward-rotatable projection 15p is generally a cylindrical curved surface (or part thereof) with a radius of R10. The maximum height of the downward-rotatable projection 15p (height at the central part) is approximately 10 mm. Furthermore, the downward-rotatable projection 15p is movable by approximately 2 mm in the left-right direction as shown in Figures 3 to 7.

[0036] Furthermore, in this embodiment, an extension shaft member 16 (for example, approximately φ16 mm) extends parallel to the axial direction of the reinforcing bar 50, passing through the upper side of the shaft member 15 while maintaining the downward rotation-allowing projection 15p in a free-moving state. A cover member 16c is fixed to the upper end of the extension shaft member 16, and an upward rotation-allowing projection 16p is provided on the lower side of the cover member 16c to guide the upward rotation-allowing recess 26r (an example of a rotation-allowing part), which will be described later, in a rotatable manner. The distance (gap) between the upper surface of the auxiliary base 15s and the lower surface of the cover member 16c is 55 mm.

[0037] In this embodiment, the shape of the left-side region of the upward-rotatable projection 16p is generally a cylindrical curved surface (part of it) with a radius of R10, and the maximum height of the upward-rotatable projection 16p (height at the central part) is about 10 mm. Furthermore, the upward-rotatable projection 16p is also movable by about 2 mm in the left-right direction as shown in Figures 3 to 7, relative to the extension shaft member 16 and the lid member 16c.

[0038] Furthermore, a first biasing force acting part 17 is provided on the other side of the first gripping member 10 (the right side in Figures 3 to 7), via an auxiliary fitting piece 18, to which a biasing force provided by a coil spring 33 (described later) acts. The first biasing force acting part 17 in this embodiment is a movable body that can slide vertically and rotate through an elongated hole 18h in the vertical direction (the extending direction of the shaft member 15) provided in the auxiliary fitting piece 18.

[0039] (Second gripping member 20) On the other hand, the bar cutting device 1 (reinforcement bar cutting device) is equipped with a second gripping part 21 that grips the second portion 52 of the reinforcement bar 50. In this embodiment, the second portion 52 is located above the first portion 51. In this embodiment, the second gripping part 21 is provided on one side (the left side in Figures 3 to 7) of a second gripping member 20 which is separate from the first gripping member 10, and the second portion 52 of the reinforcement bar 50 is gripped / released by utilizing the advancement and retraction of a clamp screw 22 as shown in the figure (in a direction substantially perpendicular to the axis of the reinforcement bar 50).

[0040] The height (thickness) of the second gripping member 20 is 44 mm in the area between the auxiliary base 15s and the lid member 16c (excluding the rotatable recesses 25r and 26r described later), and approximately 50 mm in other parts. The clamp screw 22 is approximately φ24 and 80 mm long. The opposing wall 23 (see Figure 2) facing the tip of the clamp screw 22 has a central surface (innermost surface) parallel to the tip of the clamp screw 22 with a width of approximately 6 mm, and the left and right sides of this central surface extend outwards to form an obtuse angle of 120° with respect to the central surface.

[0041] Furthermore, the second gripping member 20 of this embodiment is provided with a through hole 26 (for example, about φ22 mm) through which the extension shaft member 16 passes while maintaining a free-moving state. On the lower surface side of the second gripping member 20, a downward rotation-allowing recess 25r (an example of a rotation-allowing portion) is formed adjacent to the lower end region of the through hole 26 and is rotatably supported by the aforementioned downward rotation-allowing projection 15p. On the upper surface side of the second gripping member 20, an upward rotation-allowing recess 26r (an example of a rotation-allowing portion) is formed adjacent to the upper end region of the through hole 26 and is rotatably guided by the aforementioned upward rotation-allowing projection 16p.

[0042] In this embodiment, the shape of the right-side region of the downward rotation-allowing recess 25r is generally a cylindrical curved surface (or part thereof) with a radius of R10, and the shape of the left-side region of the downward rotation-allowing recess 25r is generally a cylindrical curved surface (or part thereof) with a radius of R10.

[0043] Furthermore, in this embodiment, the shape of the right-side region of the upward rotation-allowing recess 26r is generally a cylindrical curved surface (or part thereof) with a radius of R10, and the shape of the left-side region of the upward rotation-allowing recess 26r is generally a cylindrical curved surface (or part thereof) with a radius of R10.

[0044] Furthermore, a second biasing force acting part 27 is provided on the other side of the second gripping member 20 (the right side in Figures 3 to 7), via an auxiliary fitting piece 28, to which a biasing force provided by a coil spring 33 (described later) acts.

[0045] With the above configuration, immediately after the reinforcing bar 50 is cut, the restoring force of the coil spring 33 (described later) causes the second gripping member 20 to rotate away from the first gripping member 10 (rotating approximately 4° from the state in Figure 6 to the state in Figure 7, and the second portion 52 of the reinforcing bar 50 is lifted upward by about 4 mm).

[0046] In this embodiment, the length between the second gripping portion 21 and the downward rotation-allowing recess 25r and the upward rotation-allowing recess 26r (rotation-allowing portion) (specifically, the lateral distance between the axis of the gripped reinforcing bar 50 and the midpoint in the left-right direction of the downward rotation-allowing recess 25r to the upward rotation-allowing recess 26r, which is about 77 mm) is longer than the length between the second biasing force acting portion 27 and the downward rotation-allowing recess 25r and the upward rotation-allowing recess 26r (rotation-allowing portion) (in this embodiment, the lateral distance between the second biasing force acting portion 27 and the midpoint in the left-right direction of the downward rotation-allowing recess 25r to the upward rotation-allowing recess 26r, which is about 53 mm).

[0047] In addition, a round hole 29 is provided on the lower surface of the second gripping member 20, on the side closer to the second gripping portion 21 than the downward rotation-allowable recess 25r. A coil spring 29c is inserted into the round hole 29, and the lower end of the coil spring 29c is fixed to the upper surface of the auxiliary base 15s. The coil spring 29c prevents "rattling" by biasing the second gripping member 20 upward, especially when the biasing force of the coil spring 33, which will be described later, is not acting (see Figure 5).

[0048] (Clamping mechanism 30 and coil spring 33) In this embodiment, the first biasing force acting part 17 and the second biasing force acting part 27 are connected via a clamping mechanism 30 and a coil spring 33.

[0049] The clamp mechanism 30 of this embodiment is switchable between a biasing force activation position (see Figures 4, 6, and 7) in which a restoring force from the coil spring 33 is applied between the first biasing force application part 17 and the second biasing force application part 27, and a biasing force release position (see Figures 3 and 5) in which no restoring force from the coil spring 33 is applied between the first biasing force application part 17 and the second biasing force application part 27.

[0050] More specifically, the clamp mechanism 30 of this embodiment includes a rotating lever 31 whose base end is rotatably supported by a second biasing force acting part 27, and a relay link member 32 whose one end is rotatably supported by a rotating support part 31a provided at approximately the center of the rotating lever 31. A hook portion 32f is provided on the other end of the relay link member 32, and the tip side of the coil spring 33 is supported by the hook portion 32f. On the other hand, the first biasing force acting part 17 is a movable body that can slide vertically and rotate through an elongated hole 18h provided in the auxiliary fitting piece 18 in the vertical direction (extending direction of the shaft member 15), and this movable body (first biasing force acting part 17) supports the base end side of the coil spring 33.

[0051] A suitable example of the dimensions of the coil spring 33 is, for example, a wire diameter of 1.8 mm, a coil diameter of 12.5 mm, a natural length of the coil portion of 60 mm, and a spring constant of 0.246. The vertical sliding distance of the movable body (first biasing force acting part 17) in this embodiment is approximately 27 mm. In the state shown in Figures 3 and 5, the length of the coil spring 33 is its natural length (73 mm), and in the state shown in Figures 4 and 6, the length of the coil spring 33 is 124 mm (extended by 52 mm from its natural length). In this state, the restoring force of the coil spring 33 allows the cut reinforcing bar 50 (including the second portion 52) to be lifted (up to approximately 80 kg), as shown in Figure 7.

[0052] (cutting blade 40) Returning to Figure 1, the bar cutting device 1 of this embodiment is equipped with a cutting blade 40 that cuts between the first portion 51 and the second portion 52 of the reinforcing bar 50.

[0053] The cutting blade 40 is a cutting blade that is rotationally driven by an electric motor 41, and together with the electric motor 41, it is movable toward the reinforcing bar 50 along a pair of guide rails 42a and 42b, and is also movable toward the reinforcing bar 50 after cutting.

[0054] As shown in Figure 1, in the bar cutting device 1 of this embodiment, in a plan view, the position where the cutting blade 40 begins to cut the reinforcing bar 50 with respect to the axis of the reinforcing bar 50 is on the opposite side (a position greater than 90°, an angle of about 130° in the example of Figure 1) from the position of the downward rotation-allowable recess 25r and the upward rotation-allowable recess 26r (rotation-allowable part) (which roughly corresponds to the position of the cover member 16c in Figure 1).

[0055] (Operation of this embodiment) Next, the operation of this embodiment will be described.

[0056] First, the reinforcing bar 50 to be cut is positioned so that it extends in a substantially vertical direction. Then, the rod cutting device 1 of this embodiment is set to a state where the rotation lever 31 is lowered (a state in which the biasing force of the coil spring 33 does not act), and the first gripping part 11 and the second gripping part 21 are aligned with respect to the reinforcing bar 50.

[0057] Next, the clamp screw 12 of the first gripping part 11 grips the first portion 51 of the reinforcing bar 50, and the clamp screw 22 of the second gripping part 21 grips the second portion 52 of the reinforcing bar 50.

[0058] Next, the rotating lever 31 is manually lifted to apply a biasing force from the coil spring 33 (a force that separates the second gripping part 21 from the first gripping part 11).

[0059] In this state, the cutting blade 40 is rotated and moved parallel to the guide rails 42a and 42b to cut the reinforcing bar 50.

[0060] After cutting the reinforcing bar 50, the gripping of the first portion 51 of the reinforcing bar 50 by the first gripping portion 11 is released, and the gripping of the second portion 52 of the reinforcing bar 50 by the second gripping portion 21 is released.

[0061] (Effects of this embodiment) As described above, with the bar cutting device 1 of this embodiment, when the cutting blade 40 is cutting the reinforcing bar 50, the first gripping part 11, which is gripping the first part 51, and the second gripping part 21, which is gripping the second part 52, are biased to move away from each other. Therefore, localized concentrated stress that would conventionally be trapped inside the cutting blade 40 and the reinforcing bar 50 is effectively released as the cutting of the reinforcing bar 50 progresses. This effectively prevents unwanted loads from being placed on the reinforcing bar 50, and furthermore, it is extremely effective in preventing damage to the cutting blade 40.

[0062] Furthermore, according to the bar cutting device 1 of this embodiment, the second gripping portion 21 is provided on one side of the second gripping member 20, and a second biasing force acting portion 27, on the other side of the second gripping member 20, is provided, to which a biasing force by a coil spring 33 acts. Between the second gripping portion 21 and the second biasing force acting portion 27 of the second gripping member 20, rotation-allowing recesses 25r and 26r are provided to allow rotational movement of the second gripping portion 21 relative to the first gripping portion 11. Thus, despite its extremely simple configuration, the rotational movement of the second gripping member 20 (second gripping portion 21) caused by the rotation-allowing recesses 25r and 26r can bias the second gripping portion 21 in a direction away from the first gripping portion 11 (after cutting, it moves in that direction).

[0063] Furthermore, according to the bar cutting device 1 of this embodiment, the length between the second gripping portion 21 and the rotatable recesses 25r and 26r is longer than the length between the second biasing force acting portion 27 and the rotatable recesses 25r and 26r. As a result, the biasing force by the coil spring 33 acting on the second biasing force acting portion 27 is amplified by the so-called lever principle, allowing the second gripping portion 21 to act in a direction away from the first gripping portion 11.

[0064] Furthermore, according to the bar cutting device 1 of this embodiment, the position where the cutting blade 40 moves toward the reinforcing bar 50 and begins cutting the reinforcing bar 50 is on the opposite side (for example, at an angle of 130°) from the rotation-allowable recesses 25r and 26r with respect to the axis of the reinforcing bar 50. As a result, localized concentrated stress that would conventionally be trapped inside the cutting blade 40 and the reinforcing bar 50 is effectively released from the initial stage of cutting the reinforcing bar 50. This makes it possible to more effectively prevent unwanted loads from being placed on the reinforcing bar 50, and also to more effectively prevent damage to the cutting blade 40.

[0065] Furthermore, according to the rod cutting device 1 of this embodiment, the first gripping portion 11 is provided on one side of the first gripping member 10, and a first biasing force acting portion 17 (movable body) to which a biasing force by a coil spring 33 acts is provided on the other side of the first gripping member 10, and (in a plan view) between the first gripping portion 11 and the first biasing force acting portion 17 of the first gripping member 10, there are rotatable allowable protrusions 15p and 16p (support portions) that rotatably support the rotatable allowable recesses 25r and 26r. As a result, a configuration that biases the second gripping portion 21 in the direction away from the first gripping portion 11 is realized in an extremely compact manner.

[0066] Furthermore, in the rod cutting device 1 of this embodiment, the biasing force is provided by the restoring force of the coil spring 33. This also makes it possible to achieve an extremely compact configuration in which the second gripping part 21 is biased in the direction away from the first gripping part 11.

[0067] Furthermore, according to the bar cutting device 1 of this embodiment, the first biasing force acting part 17 and the second biasing force acting part 27 are connected via a clamping mechanism 30 and a coil spring 33. The clamping mechanism 30 is switchable between a biasing force activation position in which a restoring force from the coil spring 33 acts between the first biasing force acting part 17 and the second biasing force acting part 27, and a biasing force release position in which no restoring force from the coil spring 33 acts between the first biasing force acting part 17 and the second biasing force acting part 27. As a result, when gripping the reinforcing bar 50 with the first gripping part 11 and the second gripping part 21 before cutting, the clamping mechanism 30 can be switched to the biasing force release position, and when cutting is started after gripping the reinforcing bar 50 with the first gripping part 11 and the second gripping part 21, the clamping mechanism 30 can be switched to the biasing force activation position. As a result, there are no problems in the process of gripping the reinforcing bar 50 with the first gripping part 11 and the second gripping part 21 before cutting. [Explanation of Symbols]

[0068] 1. Bar cutting device (rebar cutting device) 10 First gripping member 11 First grip part 12 clamp screws 13 Opposing wall 15 Shaft component 15p Downward rotation-allowable protrusion 15s auxiliary base 16 Extension shaft member 16c Lid member 16p Upward rotation allowable protrusion 17 First biasing force acting part (moving body) 18 Auxiliary fitting piece 18h long hole 20 Second gripping member 21 Second grip part 22 Clamp screws 23 Opposing wall 25r downward rotation allowable recess 26 Through holes 26r Upward rotation allowable recess 27 Second biasing force acting part 28 Auxiliary fitting piece 29 round holes 29c Coil Spring 30 Clamping mechanism 31 Rotating Lever 31a Rotating support part 32 Relay link member 2f Hook section 33 Coil spring 40 cutting blade 41 Electric motor 42a Guide rail 42b Guide rail 50 reinforcing bars 51 Part 1 52 Part 2

Claims

1. A bar cutting device for cutting a bar between a first part and a second part, A first gripping part that grips the first part, A second gripping portion is provided so as to be movable relative to the first gripping portion and grips the second portion, A cutting blade that is movable toward the rod to cut between the first and second portions of the rod, and movable away from the rod after cutting, Equipped with, When the cutting blade is cutting the rod, the first gripping portion, which is gripping the first portion, and the second gripping portion, which is gripping the second portion, are biased to move away from each other. A rod cutting device characterized by the following features.

2. The second gripping portion is provided on one side of the second gripping member, A second biasing force application part is provided on the other side of the second gripping member, on which the biasing force for the biasing is applied. A rotation-allowing portion is provided between the second gripping portion and the second biasing force application portion of the second gripping member, which allows rotational movement of the second gripping portion relative to the first gripping portion. The rod cutting apparatus according to feature 1.

3. The length between the second gripping portion and the rotation-allowing portion is longer than the length between the second biasing force acting portion and the rotation-allowing portion. The rod cutting apparatus according to feature 2.

4. With respect to the axis of the aforementioned rod, the position where the cutting blade moves toward the rod and begins to cut the rod is on the opposite side from the rotation-allowable portion. The rod cutting apparatus according to feature 3.

5. The first gripping portion is provided on one side of the first gripping member, A first biasing force application portion is provided on the other side of the first gripping member, on which the biasing force acts. A support portion is provided between the first gripping portion and the first biasing force application portion of the first gripping member, which supports the rotation-allowing portion so that it can rotate. The rod cutting apparatus according to feature 4.

6. The biasing force is provided by the restoring force of the coil spring. A rod cutting device according to any one of claims 1 to 5.

7. The first biasing force application part and the second biasing force application part are connected via a clamping mechanism and the coil spring. The clamping mechanism is switchable between a biasing force activation position in which the restoring force from the coil spring acts between the first biasing force application part and the second biasing force application part, and a biasing force release position in which the restoring force from the coil spring does not act between the first biasing force application part and the second biasing force application part. The rod cutting apparatus according to feature 6.

8. The aforementioned rod material is reinforcing steel. The rod cutting apparatus according to feature 7.

Images