Cutting tool and cutting device

Abstract

To provide a cutting tool and a cutting device capable of facilitating a pulling cut operation with a simplified structure.SOLUTION: In a cutting tool 1, a pair of blade bodies 10 and 20, each having blade portions 11 and 21 on the distal side and operating portions 12 and 22 on the proximal side, are rotatably coupled to each other between the blade portions 11 and 21 and the operating portions 12 and 22. The cutting tool 1 is configured to open and close the blade portions 11 and 21 through operation of the operating portions 12 and 22, thereby cutting a target material. The pair of blade bodies 10 and 20 respectively rotate around different rotation shafts 31 and 32, and each of the blade bodies 10 (20) is provided with a relief portion 16 (26) for avoiding interference, during rotation, with the rotation shaft 32 (31), which differs from the rotation shaft 31 (32) acting as the rotational center.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a cutting tool and a cutting device.

Background Art

[0002] There is known a cutting tool that can perform a cut-off by a pair of blade bodies rotatably coupled. The cut-off not only makes it easy to utilize the sharpness of the blade bodies, but also can surely cut by pulling the object to be cut into the front side without pushing it out, and thus, a configuration for efficiently performing the cut-off has been conventionally studied. For example, in the cutting tool disclosed in Patent Document 1, a center shaft is inserted through a center hole of a first blade body and a long hole of a second blade body, and the first blade body and the second blade body are rotatably coupled, and a link rod is interposed between the first blade body and the second blade body. When the first blade body and the second blade body are closed, this cutting tool can cut the object to be cut by the action of the cut-off because the second blade body moves in the blade line direction along the long hole with respect to the first blade body.

[0003] However, in the above conventional cutting tool, since it is necessary to attach a link rod to the first blade body and the second blade body, not only does the number of parts increase and the assembly work become complicated, but also since the movement of the first blade body and the second blade body during rotation is relatively a pushing and pulling relationship, there has been a problem that the advantages of the cut-off cannot be fully obtained.

[0004] Further, as a conventional cutting device, in order to open and close a cutting tool including a pair of blade bodies, a configuration is known in which a linear motion is converted into a rotational motion by a cam mechanism to automate the cutting (for example, Patent Document 2). Since a cutting device having such a configuration is likely to perform a push cut because it performs cutting while advancing the cutting tool toward the object to be cut, the need to configure the cutting tool to be capable of performing a cut-off becomes even higher. However, in the cutting tool of Patent Document 1, the movement of the first blade body and the second blade body during rotation becomes asymmetric, and the intersection position of the blade lines that become the cutting points deviates from the center line during cutting, so it has been difficult to automatically cut the object to be cut.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, an object of the present invention is to provide a cutting tool and a cutting device that can easily perform a cut-off with a simple configuration.

Means for Solving the Problems

[0007] The above object of the present invention is a cutting tool in which a pair of blade bodies having a blade portion on the tip side and an operation portion on the base end side are rotatably coupled to each other between the blade portion and the operation portion, and the blade portion is opened and closed by operating the operation portion to cut an object to be cut. The pair of blade bodies are configured such that their respective rotations are performed about different rotation axes from each other, and each blade body is formed with a relief portion for avoiding interference with the rotation axis different from the rotation axis that becomes the center of rotation during rotation.

[0008] In this cutting tool, it is preferable that the pair of blade bodies are members having the same shape, and can be configured to be coupled in a state where one is reversed front and back with respect to the other.

[0009] Further, the above object of the present invention is a cutting device including the above-described cutting tool and an opening / closing device that opens and closes the cutting tool. The operation portion of the cutting tool has a cam portion formed on an outer surface and is biased in a direction to open the blade portion by a biasing member. The opening / closing device includes a forward / backward movement mechanism that moves the cutting tool forward and backward, and a pair of cam followers disposed on both sides in the forward / backward movement direction of the cutting tool. The above object is achieved by a cutting device configured such that when the cutting tool advances, the cam portion engages with the cam followers to close the blade portion.

Effects of the Invention

[0010] According to the present invention, it is possible to provide a cutting tool and a cutting device that can easily perform a cut-off operation with a simple configuration.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a cutting device including a cutting tool according to an embodiment of the present invention, and FIG. 2 is a plan view of the cutting device shown in FIG. 1. As shown in FIGS. 1 and 2, the cutting device 50 includes a cutting tool 1 and an opening / closing device 60 that opens and closes the cutting tool 1.

[0013] The cutting tool 1 includes a pair of blade bodies 10 and 20 having blade portions 11 and 21 facing each other on the tip side and operation portions 12 and 22 for operating the opening and closing of the blade portions 11 and 21 on the base end side. The pair of blade bodies 10 and 20 are rotatably coupled to each other by two rotation shafts 31 and 32 disposed between the blade portions 11 and 21 and the operation portions 12 and 22.

[0014] The operating parts 12 and 22 are detachably provided with cam members 13 and 23 that project outward so as to protrude toward the proximal end side. Between the inner sides of the cam members 13 and 23 facing each other, biasing members 14 and 24 each composed of a coil spring are interposed, and the operating parts 12 and 22 are biased in the direction of opening the blade parts 11 and 21 by the biasing members 14 and 24. Cam parts 13a and 23a are respectively formed on the outer surfaces of the cam members 13 and 23. The cam members 13 and 23 may be configured to be integrated with the operating parts 12 and 22.

[0015] FIG. 3 is a plan view of one of the blade bodies 10 shown in FIG. 1. As shown in FIG. 3, in the blade body 10, a circular hole-shaped through hole 15 and a long hole-shaped relief part 16 are formed between the blade part 11 and the operating part 12. The through hole 15 and the relief part 16 are formed on both side parts in the width direction of the blade body 10 (the direction orthogonal to the blade line of the blade part 11), and the relief part 16 is arranged on the same side as the blade line. Also in the other blade body 20, a circular hole-shaped through hole 25 and a long hole-shaped relief part 26 are formed between the blade part 21 and the operating part 22. The pair of blade bodies 10 and 20 are members of the same shape, whereby the cutting tool 1 can be manufactured at low cost, but they may have different shapes from each other.

[0016] FIG. 4 is an exploded perspective view of the cutting tool 1 shown in FIG. 1. As shown in FIG. 4, in the cutting tool 1, with the back surfaces of the pair of blade bodies 10 and 20 facing each other, one blade body 10 is connected to the other blade body 20 by rotation shafts 31 and 32 each composed of a bolt in a state where they are reversed front and back. One rotation shaft 31 is inserted through the relief part 26 of the other blade body 20 and the through hole 15 of one blade body 10 via a coil spring 31a and a washer 31b, and is screwed into a screw hole 33a of a connecting piece 33 via a washer 31c. The diameter of the through hole 15 is substantially the same as the diameter of the rotation shaft 31, and one blade body 10 rotates about the rotation shaft 31.

[0017] The rotation axis 32 of the other side is inserted through the through-hole 25 of the other blade body 20 and the relief portion 16 of one blade body 10 via a coil spring 32a and a washer 32b, and is screwed into the screw hole 33b of the connecting piece 33 via a washer 32c. The diameter of the through-hole 25 is substantially the same as the diameter of the rotation axis 32, and the other blade body 20 rotates about the rotation axis 32.

[0018] The relief portions 16, 26 have a width slightly larger than the diameter of the inserted rotation axes 32, 31, and are formed such that their respective longitudinal directions are substantially the same as the cutting edges of the cutting portions 11, 21. One relief portion 16 avoids interference with the other rotation axis 32 throughout the rotation of one blade body 10 about one rotation axis 31. The other relief portion 26 avoids interference with the one rotation axis 31 throughout the rotation of the other blade body 20 about the other rotation axis 32. The shape and size of the relief portions 16, 26 are not particularly limited as long as the pair of blade bodies 10, 20 can be reliably coupled to the rotation axes 32, 31 using washers 31b, 32c, etc. shown in FIG. 4, and may be notches or the like in addition to the through-holes, but it is preferable that they serve as stoppers so that the pair of blade bodies 10, 20 do not open too much due to the biasing by the biasing members 14, 24. Further, the relief portions 16, 26 can also function as guides by configuring the inner wall surfaces thereof such that the rotation axes 32, 31 slide during the rotation of the pair of blade bodies 10, 20.

[0019] As shown in FIGS. 1 and 2, the opening / closing device 60 includes a reciprocating mechanism 70 that is supported by a rectangular substrate 90 and reciprocates the cutting tool 1, and a pair of cam followers 81, 82, and is covered by a casing 100 as shown by the two-dot chain line in FIG. 2.

[0020] The advancing / retreating mechanism 70 is a ball screw mechanism, and includes a linear guide 71 fixed to the substrate 90, a moving body 72 that moves along the linear guide 71, a support table 73 fixed to the upper part of the moving body 72 to support the cutting tool 1, and a ball screw 74 that converts the rotation of the motor 75 into the linear motion of the moving body 72. The connecting piece 33 is fixed to the upper surface of the support table 73 such that the direction from the proximal end to the distal end of the cutting tool 1 coincides with the guiding direction of the linear guide 71 in a plan view. The biasing members 14 and 24 of the cutting tool 1 are respectively inserted into the counterbores formed on both sides of a support block 76 provided on the support table 73 and are supported so as to be stretchable.

[0021] A pair of cam followers 81 and 82 are arranged on both sides in the advancing / retreating direction of the cutting tool 1 and are respectively supported by support columns 83 and 84 standing up from the upper surface of the substrate 90.

[0022] As shown in FIGS. 1 and 2, the cutting device 50 having the above configuration shifts from a standby state in which the entire cutting tool 10 is located directly above the substrate 90 and is housed in the casing 100 to a cutting state in which the cutting edges 11 and 21 of the cutting tool 10 protrude to the outside through the opening of the casing 100 when the cutting tool 10 is advanced along the linear guide 71 to the tip side by the operation of the advancing / retreating mechanism 70, as shown in FIGS. 5 and 6.

[0023] As the cutting tool 10 advances, the cam portions 13a and 23a of the cam members 13 and 23 respectively engage with the cam followers 82 and 81, and the operation portions 12 and 22 approach each other against the biasing force of the biasing members 14 and 24. Thereby, the pair of blade bodies 10 and 20 rotate in a direction to close the blade tips, and the object to be cut is cut.

[0024] As described above, the pair of blade bodies 10 and 20 rotate about different rotation axes 31 and 32. When one blade body 10 rotates about one rotation axis 31 and shifts from the standby state to the cutting state, the other rotation axis 32 moves from the base end portion to the tip end portion of one relief portion 16. Further, when the other blade body 20 rotates about the other rotation axis 32 and shifts from the standby state to the cutting state, the one rotation axis 31 moves from the base end portion to the tip end portion of the other relief portion 26. As a result, as shown in the plan view in FIG. 7, each point on the cutting edge lines of the cutting edges 11 and 21 moves symmetrically as indicated by the arrow by closing the pair of blade bodies 10 and 20, and it is possible to perform a cut from both sides with respect to the object to be cut. Therefore, it is possible to suppress the demerit of being a push cut due to the advancement of the cutting tool 10 and to easily realize the automation of cutting. The object to be cut only needs to be suitable for being cut, and its shape is not particularly limited, such as a rod shape, a strip shape, or a plate shape.

[0025] Further, as shown in FIG. 7, since the rotation axes 31 and 32 that are the rotation centers of the pair of blade bodies 10 and 20 are respectively arranged on both sides in the width direction of the cutting tool 1, compared with a configuration in which a common rotation axis C is provided at the center in the width direction of the cutting tool 1 like a conventional cutting tool, the pair of blade bodies 10 and 20 can be easily and surely opened and closed by the engagement of the cam portions 13a and 23a and the cam followers 82 and 81.

[0026] After cutting the object to be cut, by operating the advance / retreat mechanism 70 to retract the cutting tool 10 and releasing the engagement between the cam members 13 and 23 and the cam followers 82 and 81, the pair of blade bodies 10 and 20 rotate in the opening direction by the biasing of the biasing members 14 and 24, and reach the standby state shown in FIGS. 1 and 2.

[0027] The cutting tool 1 of this embodiment is configured to automatically open and close the cutting tool 1 in combination with the opening and closing device 60 by providing the operation parts 12 and 22 with the cam parts 13a and 23a. However, for example, as shown in Fig. 8(a), finger holes may be provided in the operation parts 12 and 22 respectively so that the cutting tool 1 can be manually opened and closed in the same way as a general pair of scissors. In this case as well, as shown in Fig. 8(b), by closing the pair of blade bodies 10 and 20, the object to be cut can be cut off. The two rotating shafts 31 and 32 shown in Fig. 8 may be coupled by the connecting piece 33 in the same configuration as shown in Fig. 4, or may be individually coupled by nuts or the like. In this case, it is preferable that the relief parts 16 and 26 serve as guides so that the rotating shafts 32 and 31 slide on the inner wall surfaces thereof respectively.

Explanation of reference numerals

[0028] 1 Cutting tool 10, 20 Blade bodies 11, 21 Blade parts 12, 22 Operation parts 13, 23 Cam members 13a, 23a Cam parts 14, 24 Biasing members 16, 26 Relief parts 31, 32 Rotating shafts 50 Cutting device 60 Opening and closing device 70 Advancing and retracting mechanism 81, 82 Cam followers

Claims

1. A cutting tool having a pair of blade bodies with a blade portion at the tip end side and an operation portion at the base end side, the pair of blade bodies being rotatably coupled to each other between the blade portion and the operation portion, and the blade portion being opened and closed by operating the operation portion to cut an object to be cut, wherein the pair of blade bodies rotate about different rotation axes from each other, each of the blade bodies is formed with a relief portion for avoiding interference with the rotation axis different from the rotation axis that becomes the center of rotation during rotation.

2. The cutting tool according to claim 1, wherein the pair of blade bodies are members having the same shape and are coupled in a state where one is reversed front and back with respect to the other.

3. A cutting device comprising the cutting tool according to claim 1 or 2 and an opening / closing device for opening and closing the cutting tool, wherein a cam portion is formed on an outer surface of the operation portion of the cutting tool, and the blade portion is biased in a direction to open by a biasing member, the opening / closing device includes a forward / backward movement mechanism for moving the cutting tool forward and backward and a pair of cam followers disposed on both sides in the forward / backward movement direction of the cutting tool, and is configured such that when the cutting tool moves forward, the cam portion engages with the cam followers to close the blade portion.

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