JP7365636B2 - cutting tools - Google Patents

Description

The present disclosure relates to cutting tools. More particularly, the present disclosure relates to a cutting tool with a movable blade and a fixed blade.

As a conventional example of a cutting tool equipped with a movable blade and a fixed blade, a rod-shaped object cutting machine described in Patent Document 1 is exemplified. The rod-shaped object cutting machine described in Patent Document 1 includes a fixed blade and a movable blade that moves toward and away from the fixed blade and cuts the rod-shaped object (object to be cut) by shearing action. This rod-shaped object cutting machine cuts an object by intersecting a fixed blade and a movable blade. In this rod-shaped object cutting machine, even if the operating section is kept in an on state, when the movable blade and the fixed blade are fully opened after cutting the rod-shaped object, the movable blade is stopped.

Japanese Patent Application Publication No. 2005-238432

In the rod-shaped object cutting machine described in Patent Document 1, when the configuration is such that a quarter-section screw can be cut using a cutting blade (a second movable blade and a second fixed blade) for a quarter-section screw (second long object). When a 3-minute screw is cut using the cutting blades (first movable blade and first fixed blade) for a 3-minute screw (first long object), the movable blade continues to move forward for a while after cutting. Since the moving distance that the movable blade moves forward after cutting is long, there is a possibility that the operator may have to turn off the operating section during the movement to stop the bar-shaped cutter.

An object of the present invention is to provide a cutting tool that can reduce the amount of movement of a movable blade forward after cutting a long object.

A cutting tool according to one aspect of the present disclosure includes a fixed blade, a movable blade, and a tool body. The fixed blade has a fixed recess for holding a long object. The movable blade has a movable recess for holding the elongated object, and is movable with respect to the fixed blade. The tool main body advances the movable blade in a direction approaching the fixed blade in response to an operation of the operating section, cuts the long object by the movable blade and the fixed blade, and after cutting, the movable blade moves forward in a direction approaching the fixed blade. The blade is moved backward to separate the movable blade from the fixed blade. The fixed blade and the movable blade are each replaceable. When cutting a first elongated object having a first diameter as the elongated object, a first elongated object having the fixed recess and the movable recess corresponding to the first diameter is used as the fixed blade and the movable blade. A fixed blade and a first movable blade are used. When cutting a second long object having a second diameter larger than the first diameter, the fixed recess corresponding to the second diameter is used as the fixed blade and the movable blade. A second fixed blade and a second movable blade having the movable recess are used. When the second movable blade and the second fixed blade are used, the position of the second movable blade at the time of starting cutting of the second long object is a first position, and the first movable blade and the first fixed blade are used. When using a blade, the position of the first movable blade at the time of starting cutting of the first elongated object is defined as a second position. In the direction in which the movable blade approaches the fixed blade, the first position is located in front of the second position.

According to the present disclosure, there are advantages. It is possible to provide a cutting tool that can reduce the amount of movement of the movable blade forward after cutting a long object.

FIG. 1 is a front view of a cutting tool according to an embodiment. FIG. 2 is a perspective view of the cutting tool same as above. FIG. 3 is a perspective view of a cutting blade for a quarter screw. FIG. 4A is a plan view of the cutting blade for the quarter screw described above. FIG. 4B is a side view of the cutting blade for the quarter screw described above. FIG. 5A is a plan view of a cutting blade for a three-minute screw. FIG. 5B is a side view of a cutting blade for a three-minute screw. FIG. 6 is a perspective view of the fixed arm with the fixed blade removed. FIG. 7 is a plan view of the fixed arm and the movable arm. FIG. 8 is a perspective view of the fixed arm with a fixed blade for a 3-minute screw attached via a spacer. FIG. 9 is a perspective view of the spacer same as above. FIG. 10 is an explanatory diagram illustrating the operation of the cutting tool of the comparative example in the case of using the quarter screw of the comparative example. FIG. 11 is an explanatory diagram illustrating the operation of the cutting tool of the comparative example when the three-segment screw of the embodiment is used. FIG. 12 is an explanatory diagram illustrating the operation of the cutting tool of the embodiment when the quarter screw of the embodiment is used. FIG. 13 is an explanatory diagram illustrating the operation of the cutting tool of the embodiment when the three-minute screw of the embodiment is used. FIGS. 14A and 14B are explanatory views showing how a thread is cut using the cutting blade of the embodiment. FIG. 15 is an explanatory diagram showing an example of the moving speed of the cutting blade of the embodiment.

A cutting tool according to an embodiment will be described below with reference to the drawings. However, the embodiment described below is only one of various embodiments of the present disclosure. The embodiments described below can be modified in various ways depending on the design, etc., as long as the objective of the present disclosure can be achieved. In addition, each figure described in the following embodiments is a schematic diagram, and the ratio of the size and thickness of each component in the figure does not necessarily reflect the actual size ratio. .

(1) Overview As shown in FIG. 1, the cutting tool 1 of this embodiment includes a pair of cutting blades 6 and a tool body 7. The cutting tool 1 is, for example, a hand-held power tool that cuts an object with a pair of cutting blades 6. Handheld means that the size and weight allow a person to pick it up and carry it around.

The object to be cut is, for example, a long object 9. The elongated object 9 may be a part of a predetermined member, or may be the entire predetermined member. In the present disclosure, a long object means a portion whose length in the longitudinal direction is twice or more the length in each direction orthogonal to the longitudinal direction. More preferably, in the case of a long object, the length in the longitudinal direction is at least five times the length in each direction perpendicular to the longitudinal direction. More preferably, in the case of a long object, the length in the longitudinal direction is at least 10 times the length in each direction perpendicular to the longitudinal direction. In FIG. 1, the longitudinal direction of the elongated object 9 in this embodiment is the vertical direction of the paper surface.

Specific examples of the predetermined member having the elongated object 9 are a full thread, a thread other than a full thread, a bolt, a reinforcing bar, a pipe, or a square or cylindrical member made of wood, metal, or the like. In this embodiment, the predetermined member is a full thread, and the elongated object 9 is the entire thread. In this embodiment, a cutting tool 1 for cutting a full thread will be described. More specifically, the cutting tool 1 cuts a long object 9 (full thread) that protrudes vertically downward from a structure such as a ceiling. One end (upper end) of the elongated object 9 is fixed to the ceiling or the like. More specifically, the elongated objects 9 (full threads) include three-minute threads (first elongated objects having a first diameter) and four-minute threads (having a second diameter larger than the first diameter). The second long object) is the object to be cut. A three minute thread is a thread with a diameter of 3/8 inch. A quarter screw is a screw with a diameter of 4/8 inch. Therefore, a three-minute screw is a screw with a smaller diameter than a four-minute screw.

In this embodiment, as the pair of cutting blades 6, a pair of cutting blades for a 4-minute screw and a pair of cutting blades for a 3-minute screw are prepared. In the cutting tool 1, the pair of cutting blades 6 can be replaced with a pair of cutting blades for a 4-minute screw or a pair of cutting blades for a 3-minute screw. That is, when the cutting tool 1 cuts a quarter thread, a pair of cutting blades for the quarter thread are attached as the pair of cutting blades 6 . Further, when cutting a 3-minute thread, the cutting tool 1 is equipped with a pair of cutting blades for the 3-minute thread as a pair of cutting blades.

(2) Tool body As shown in FIG. 2, the tool body 7 includes a handle 71, an auxiliary handle 72, a trigger switch 73 (operation section), a housing 74, a mounting section 75, a fixed arm 81, and a movable arm 82.

The handle 71, the auxiliary handle 72, and the housing 74 accommodate a motor included in the tool body 7, a drive circuit for the motor, and the like. The housing 74 has a cylindrical portion and a base portion 742 connected to the axial tip of the cylindrical portion 741 . A surface 7421 of the base portion 742 on the opposite side to the cylindrical portion 741 side is planar. The handle 71 protrudes from the side surface of the cylindrical portion 741. A trigger switch 73 is provided outside the handle 71. The auxiliary handle 72 protrudes from the base portion 742. The direction in which the auxiliary handle 72 projects is along the direction in which the handle 71 projects. The handle 71 and the auxiliary handle 72 are connected to the mounting portion 75 at the distal ends in the respective protruding directions. A battery pack 76 containing a battery (secondary battery) is attached to the mounting portion 75 . Although the battery pack 76 is not included in the configuration of the cutting tool 1 in this embodiment, the battery pack 76 may be included in the configuration of the cutting tool 1.

The fixed arm 81 and the movable arm 82 protrude from the outer surface of the base portion 742 of the housing 74. The fixed arm 81 and the movable arm 82 are provided on the opposite side of the auxiliary handle 72 with the base portion 742 interposed therebetween. The movable arm 82 is positioned offset from the fixed arm 81 in the axial direction of the cylindrical portion 741 (in the left-right direction of the plane of the paper in FIG. 2).

The pair of cutting blades 6 have the same shape and size. One of the pair of cutting blades 6 is attached to the fixed arm 81 as a fixed blade, and the other cutting blade 6 is attached to the movable arm 82 as a movable blade. The shape of the cutting blade 6 will be explained in detail later.

More specifically, the bolt B1 passed through the through hole 810 formed in the fixed arm 81 is screwed into the attachment hole 6b formed in the cutting blade 6, so that one of the cutting blades 6 is attached to the fixed arm 81. can be installed. Further, the other cutting blade 6 is attached to the movable arm 82 by screwing the bolt B1 passed through the through hole 820 formed in the movable arm 82 into the attachment hole 6b formed in the cutting blade 6. . In this way, the tool body 7 holds the pair of cutting blades 6.

The movable arm 82 is supported rotatably around a predetermined rotation axis on the base portion 742 of the tool body 7 . The movable arm 82 can be displaced in the direction indicated by arrow A1 in FIG. 1 by rotating around the above-mentioned predetermined rotation axis. In other words, the movable arm 82 can be moved toward or away from the fixed arm 81 along a plane perpendicular to the thickness direction of the cutting blade 6.

When the trigger switch 73 is pressed while the long object 9 is in contact with the cutting blade 6 attached to the fixed arm 81, the movable arm 82 is moved to the fixed arm by the driving force of the motor housed in the housing 74. Move closer to 81. As a result, the long object 9 is sandwiched between the cutting blade 6 attached to the movable arm 82 and the cutting blade 6 attached to the fixed arm 81, and the long object 9 is sheared (cut). In this embodiment, when the trigger switch 73 continues to be pressed, the movable arm 82 automatically returns to its original position (that is, the position where the distance between the movable blade and the fixed blade is fully open) after cutting the long object 9. returned to the target.

In this embodiment, the tool main body 7 has a cutting tool cover 2, and the fragment 91 cut off from the elongated object 9 by the pair of cutting blades 6 is passed through the opening 21 of the cutting tool cover 2. It is accommodated inside the cutting tool cover 2.

(3) Cutting Blade As described above, the cutting blade 6 includes a cutting blade 60 (second cutting blade) for a quarter-minute screw and a cutting blade 50 (first cutting blade) for a three-minute screw. First, the cutting blade 60 for quarter screws will be described with reference to FIGS. 3, 4A, and 4B.

As shown in FIGS. 3, 4A, and 4B, the cutting blade 60 for a quarter screw has a base material 61, two recesses 62, 63, and an attachment hole 64 (attachment portion). In the following explanation, as shown in FIG. 3, the width direction H1, length direction H2, thickness direction H3, and axis H4 of the base material 61 are set. It does not limit the usage. The axis H4 is a virtual axis and is parallel to the thickness direction H3.

The base material 61 has a substantially rectangular plate shape in plan view, for example. The planar shape of the base material 61 is a substantially rectangular shape with predetermined dimensions so as to fit into the attachment locations of each of the fixed arm 81 and the movable arm 82. The base material 61 has main surfaces 61a and 61b on both sides in the thickness direction H3, and end surfaces 61c and 61d on both sides in the length direction H2. In this embodiment, two of the four corners of the main surface 61a of the base material 61 are chamfered, but they do not need to be chamfered.

The two recesses 62 and 63 are portions that hold the quarter screw that is the object to be cut. When the quarter screw (elongated object 9) is held in the recesses 62 and 63, the axis H4 of the base material 61 becomes parallel to the long axis of the quarter screw. The two recesses 62 and 63 are provided on both end surfaces 61c and 61d of the base material 61. The two recesses 62 and 63 are provided at the center of the end surfaces 61c and 61d in the width direction H1 (more specifically, at a position slightly biased to one side in the width direction H1), and are located toward the center of the base material 61. It is concave in an arc shape. The two recesses 62 and 63 are opened in an arc shape on both main surfaces 61a and 61b of the base material 61.

More specifically, one of the recesses 62 has a diameter R1 (length in the width direction H1) that is approximately the same diameter as the diameter of the quarter screw (slightly smaller than the diameter of the quarter screw), and a depth R2 ( It is approximately semicircular (arc-shaped) with a length (length in the length direction H2) that is less than the radius of the quarter screw. The other recess 63 has a semicircular shape with a diameter R3 that is the same as the diameter of the quarter thread, and a depth R4 that is the same size as the radius of the quarter thread. That is, the two recesses 62 and 63 have different depths R2 and R4, and the recess 62 is shallower than the recess 63. Further, the diameter R1 is smaller than the diameter R3 (R1<R3).

Note that these are the diameter (diameter) R1 and depth (radius) R2 of the recess 62, and the diameter and radius of a thread root of a thread groove 62a, which will be described later, of the recess 62. Similarly, the diameter (diameter) R3 and depth (radius) R4 of the recess 63 are the diameter and radius of the thread root of the thread groove 63a (described later) of the recess 63. Thread grooves 62a, 63a are formed on inner surfaces 62a, 63a of each recess 62, 63. The thread grooves 62a, 63a are formed to fit into the threads of the quarter screws held in the recesses 62, 63. That is, the thread grooves 62a and 63a are provided to be inclined with respect to the axis H4 when viewed from the longitudinal direction H2 (see FIG. 4B).

The attachment hole 64 is a hole for attaching the cutting blade 60 to the fixed arm 81 or the movable arm 82. In this embodiment, the attachment hole 64 constitutes the above-mentioned attachment hole 6b (see FIG. 2). The attachment hole 64 penetrates the base material 61 in the thickness direction H3. The mounting hole 64 is provided at a position slightly offset from the center in the width direction H1 in the width direction H1 on the main surface 61a of the base material 61, and is provided at a position slightly offset from the center in the length direction H2 toward the recess 62 side. ing. In this embodiment, the center P1 of the attachment hole 64 and the centers of the two recesses 62 and 63 in the width direction H1 are aligned on an imaginary line M1 parallel to the length direction H2. If the distance between the center P1 of the mounting hole 64 and the end surface 61c is a first distance L1, and the distance between the center P1 of the mounting hole 64 and the end surface 61d is a second distance L2, then the first distance L1 is the second distance L1. is smaller than the distance L2. That is, of the two recesses 62 and 63, the recess 62 closer to the attachment hole 64 has a shallower depth than the recess 63 farther from the attachment hole 64. In this way, the attachment hole 64 is arranged offset from the center of the main surface 61a of the base material 61. Thereby, as will be described later, when the cutting blade 60 is attached to the attachment location of the fixed arm 81 or the movable arm 82, it is possible to prevent the front and back of the cutting blade 60 from being mistaken or the cutting blade 60 to be oriented in the wrong direction.

One main surface 61b of the base material 61 is perpendicular to the axis H4 of the base material 61. Moreover, the other main surface 61a of the base material 61 is inclined with respect to the axis H4 when viewed from the length direction H2 (see FIG. 4B). The axis H4 is parallel to the long axis of the elongated object 9 held in the recesses 62 and 63. Therefore, the main surface 61a is inclined to the long axis of the elongated object 9 held in the recesses 62 and 63 when viewed from the longitudinal direction H2. In other words, the main surface 61a is inclined with respect to the main surface 61b. More specifically, the main surface 61a is inclined such that the thickness of the base material 61 becomes thinner from one side to the other side in the width direction H1 when viewed from the length direction H2. This inclination is preferably the same inclination angle as the inclination angle of the thread grooves provided in the recesses 62 and 63. Thereby, when the thread is cut with the cutting blade 60, it is possible to suppress the occurrence of burrs on the cut surface of the thread.

In this cutting blade 60, the two corners formed by the inclined main surface 61a and the inner circumferential surfaces of the two recesses 62 and 63 serve as cutting edges 65 and 66, respectively. In this embodiment, as an example, of the two cutting edges 65 and 66, the cutting edge 65 of the shallower recess 62 is used as the cutting edge of the movable blade, and the cutting edge 66 of the deeper recess 63 is used as the cutting edge of the fixed blade. . Hereinafter, the recess 62 on the movable blade side will also be referred to as the movable recess 62, and the recess 63 on the fixed blade side will also be referred to as the fixed recess 63. Note that the fixed recess 63 holds the long object 9 when cutting the long object 9 (four-minute screw) when the cutting blade 60 is used as a fixed blade. The movable recess 62 holds the long object 9 when cutting the long object 9 (four-minute screw) when the cutting blade 60 is used as a movable blade. Further, the main surface (slanted surface) 61a of the cutting blade 60 is also referred to as a blade surface 61a, and the main surface 61b of the cutting blade 60 is also referred to as a back surface 61b.

The cutting blade 60 has a movable blade part 600 and a fixed blade part 610.

The movable blade portion 600 is a rectangular plate-shaped portion of the cutting blade 60 that includes a movable recess 62 and a mounting hole 64. The fixed blade portion 610 is a rectangular plate-shaped portion of the cutting blade 60 that includes the fixed recess 63 and the attachment hole 64. In other words, the movable blade portion 600 is a portion of the cutting blade 60 that has a constant length from one end surface 61c to the other end surface 61d. The fixed blade portion 610 is a portion of the cutting blade 60 that has a certain length (the same length as the above-mentioned certain length) from the other end surface 61d toward the one end surface 61c.

The movable blade part 600 and the fixed blade part 610 have mutually different shapes when viewed from the direction (axis H4 direction) that intersects the main surface 61a of the base material 61 (that is, the plane that intersects the long axis of the elongated object 9). are doing. Specifically, the movable recess 62 and the fixed recess 63 of the movable blade portion 600 and the fixed blade portion 610 have different depths. More specifically, the movable recess 62 has a shallower depth than the fixed recess 63. Further, the first distance L1 and the second distance L2 are different. More specifically, the first distance L1 is smaller than the second distance L2.

The movable blade portion 600 and the fixed blade portion 610 are provided on both sides of the cutting blade 60 in the length direction H2. Here, the length direction H2 is the direction in which the movable blade moves relative to the fixed blade when one of the pair of cutting blades 60 is used as a movable blade and the other is used as a fixed blade.

In this embodiment, one of the pair of cutting blades 60 is used as a fixed blade (second fixed blade), and the other is used as a movable blade (second movable blade). When the movable blade is moved relative to the fixed blade, the quarter screw is aligned with the long axis of the quarter screw by the cutting edge 65 of the movable recess 62 of the movable blade and the cutting edge 66 of the fixed recess 63 of the fixed blade. It is cut at the intersecting plane (blade surface 61a). When the cutting blade 60 is attached to the movable arm 82 as a movable blade, it moves (forwards or retreats) along the length direction H2 of the cutting blade 60.

Next, with reference to FIGS. 5A and 5B, the cutting blade 50 for a 3-minute screw will be described.

In the following explanation, as shown in FIGS. 5A and 5B, the width direction H5, length direction H6, thickness direction H7, and axis H8 of the base material 51 are set, and each of these directions H5 to H7 is defined by the cutting blade 50. It does not limit the function or usage of. Axis H8 is a virtual axis and is parallel to thickness direction H7.

As shown in FIGS. 5A and 5B, like the cutting blade 60, the cutting blade 50 includes a base material 51, two recesses 52 and 53, and an attachment hole 54 (attachment part). The attachment hole 54 constitutes the above-mentioned attachment hole 6b (see FIG. 2).

Each component of the cutting blade 50 (base material 51, two recesses 52, 53, and attachment hole 54) is connected to each component of the cutting blade 60 (base material 61, two recesses 62, 63, and attachment hole 64), respectively. It corresponds and has the same function as the corresponding component of the cutting blade 60. Like the base material 61, the base material 51 has main surfaces 51a and 51b on both sides in the thickness direction H7, and end faces 51c and 51d on both sides in the length direction H6.

The cutting blade 50 is formed in the same manner as the cutting blade 60 except that the dimensions of the two recesses 52 and 53 and the thickness of the base material 51 are different.

Specifically, both of the two recesses 52 and 53 have a diameter R5 (length in the width direction H5) that is the same diameter as the diameter of the 3-minute screw, and a depth R6 (length in the length direction H2). It is a semicircle with the same size as the radius of the three-minute screw. That is, the two recesses 52 and 53 are smaller in size than the two recesses 62 and 63, and the depths R5 of the recesses 52 and 53 are the same.

Note that the diameter R5 and depth (radius) R6 of the recesses 52 and 53 are the diameter and radius of the thread root of the thread grooves 52a and 53a, which will be described later, of the recess 52.

Further, like the two recesses 62 and 63, the two recesses 52 and 53 are arranged slightly biased toward one side in the width direction H5 from the center in the width direction H5 on both end surfaces 51c and 51d of the base material 51. There is. Thread grooves 52a and 53a are formed in the inner circumferential surfaces of the two recesses 52 and 53, similarly to the two recesses 62 and 63. However, the thread grooves 52a and 53a of the two recesses 52 and 53 are formed to fit into the threads of the three-minute thread.

Further, the thickness of the base material 51 of the cutting blade 50 (the length in the thickness direction H7) is smaller than the thickness of the base material 61 of the cutting blade 60 (the length in the thickness direction H3). This is because the cutting blade 50 does not require as much strength as the cutting blade 60 because it cuts a 3-minute thread that is thinner than a 4-minute thread.

Further, the planar shape of the base material 51 of the cutting blade 50 is the same shape and size as the planar shape (substantially rectangular shape) of the base material 61 of the cutting blade 60. Further, like the base material 61, one main surface 61a of the base material 51 is inclined with respect to the other main surface 51b. Further, like the mounting hole 64 of the base material 61, the mounting hole 54 of the base material 51 is provided at a position slightly offset in the width direction H5 from the center of the width direction H5 on the main surface 51a of the base material 51, and has a long length. It is provided at a position slightly biased toward the recess 32 from the center in the width direction H6. Further, if the distance between the center P2 of the mounting hole 54 and the end surface 51c is a third distance L3, and the distance between the center P2 of the mounting hole 54 and the end surface 51c is a fourth distance L4, it is similar to the case of the base material 61. In addition, the third distance L3 is smaller than the fourth distance L4.

In this cutting blade 50, two corners formed by the inclined main surface 51a and the inner peripheral surfaces of the two recesses 52 and 53 serve as cutting edges 55 and 56, respectively. In this cutting blade 50, of the two cutting edges 55 and 56, for example, the cutting edge 55 of one recess 52 is used as the cutting edge of the movable blade, and the cutting edge 56 of the other recess 53 is used as the cutting edge of the fixed blade. Hereinafter, the recess 52 on the movable blade side will also be referred to as the movable recess 52, and the recess 53 on the fixed blade side will also be referred to as the fixed recess 53. Further, the main surface (slanted surface) 51a of the cutting blade 50 is also referred to as a blade surface 51a, and the main surface 51b of the cutting blade 50 is also referred to as a back surface 51b.

In this embodiment, one of the pair of cutting blades 60 is used as a fixed blade (first fixed blade), and the other is used as a movable blade (first movable blade). When the movable blade is moved relative to the fixed blade, the 3-minute screw is aligned with the long axis of the 3-minute screw by the cutting edge 65 of the movable recess 52 of the movable blade and the cutting edge 66 of the fixed recess 53 of the fixed blade. It is cut at the intersecting plane (blade surface 51a). When this cutting blade 50 is attached to the movable arm 82 as a movable blade, it moves (forwards or retreats) along the length direction H6 of the cutting blade 50.

(4) How to attach the cutting blade Next, how to attach the cutting blade 6 to the fixed arm 81 will be explained with reference to FIGS. 6 to 9.

First, how to attach the cutting blade 60 for a quarter screw will be explained. As shown in FIG. 6, the fixed arm 81 has an attachment recess (attachment location) 811. The mounting recess 811 is formed on the mounting surface (for example, the upper surface) 81a of the fixed arm 81 so as to be depressed in the thickness direction of the fixed arm 81. Note that the mounting surface 81a of the fixed arm 81 is a surface (opposing surface) that faces the lower surface of the movable arm 82 when cutting the long object 9. The mounting recess 811 has a bottom surface that is approximately the same shape and size as the planar shape of the cutting blade 60 . One inner surface 811a of the four inner surfaces 811a, 811b, 811c, and 811d of the mounting recess 811 is open at the side surface of the fixed arm 81. Hereinafter, this open side surface 811a will also be referred to as an open side surface 811a. The open side surface 811a of the fixed arm 81 is the side surface toward which the movable arm 82 approaches when cutting the long object 9. The cutting edge 66 of the cutting blade 60 is arranged on the open side surface 811a of the fixed arm 81.

A positioning recess 811e for positioning a spacer 40, which will be described later, is provided on the inner surface 811d of the mounting recess 811. The positioning recess 811e is provided, for example, approximately at the center of the inner surface 811d. The positioning recess 811e is recessed so as to protrude from the inner surface 811d toward the outer circumferential side of the mounting recess 811, and opens at the mounting surface (for example, the upper surface) 81a of the fixed arm 81. The planar shape of the positioning recess 811e is, for example, a semicircle.

Furthermore, a recess 811g in which the elongated object 9 is placed is provided on an end surface 811f of the bottom 811h of the attachment recess 811 on the side opening 811a side. The recessed portion 811g is recessed in a semicircular shape from the end surface 811f toward the center of the bottom portion 811h. The recessed portion 811g penetrates the bottom portion 811h in the thickness direction. The planar shape of the recessed portion 811g is, for example, a semicircle with a radius larger than the radius of the quarter screw (elongated object 9). A through hole 811i is provided in the bottom 811h of the mounting recess 811. This through hole 811i constitutes the above-mentioned through hole 810 (see FIG. 2).

When attaching the cutting blade 60 to the attachment recess 811 of the fixed arm 81, the cutting blade 60 is disposed in a fitted manner within the attachment recess 811, as shown in FIG. In this arrangement state, the back surface 61b of the cutting blade 60 faces the bottom 811h of the mounting recess 811, the blade surface 61a of the cutting blade 60 faces the top opening side of the mounting recess 811, and the fixed recess 63 of the cutting blade 60 faces the bottom 811h of the mounting recess 811. , overlaps with the recess 811g of the attachment recess 811, and the attachment hole 64 of the cutting blade 60 concentrically overlaps the through hole 811i (810) of the attachment recess 811. Further, the end surface 61d of the cutting blade 60 is flush with the opening side surface 811a of the fixed arm 81, and the cutting edge 66 of the fixed recess 63 is arranged on the opening side surface 811a of the fixed arm 81. In this state, the bolt B1 is screwed into the attachment hole 64 (6b) of the cutting blade 60 through the through hole 811i (810). As a result, the cutting blade 60 is attached to the attachment recess 811 of the fixed arm 81. In this case, the cutting blade 60 is used as a fixed blade, and the cutting edge 66 of the fixed recess 63 becomes the cutting edge of the fixed blade.

Similarly to the fixed arm 81, the cutting blade 60 is attached to the movable arm 82 with a bolt B1 (see FIG. 7). More specifically, a mounting recess 821 is provided on the mounting surface (lower surface) 82a of the movable arm 82, similar to the fixed arm 81. Like the mounting recess 811 of the fixed arm 81, the mounting recess 821 has a recess 821g, a mounting hole 821i, and a positioning recess 821e. The attachment hole 821i constitutes the above-mentioned through hole 820 (see FIG. 2).

Furthermore, the mounting recess 821 of the movable arm 82 further includes a positioning protrusion 821f. The positioning protrusion 821f protrudes from the inner surface 821c of the mounting recess 821 toward the inside of the mounting recess 821 (see FIG. 7). The positioning protrusion 821 positions the spacer 40, which will be described later, together with the positioning protrusion 821.

When the cutting blade 60 is attached to the mounting recess 821, the blade surface 61a of the cutting blade 60 faces the lower opening side of the mounting recess 821, the movable recess 62 of the cutting blade 60 overlaps the recess 821g, and the end surface of the cutting blade 60 61c is flush with the open side surface 821a of the movable arm 82, and the cutting edge 65 of the movable recess 62 is arranged on the open side surface 821a of the movable arm 82. In this case, the cutting blade 60 is used as a movable blade, and the cutting edge 65 of the movable recess 62 becomes the cutting edge of the movable blade.

Next, how to attach the cutting blade 50 for a 3-minute screw will be explained. When attaching the cutting blade 50 to the mounting recess 811 of the fixed arm 81, as shown in FIG. The installation method is the same. The cutting blade 50 of the 3-minute screw is thinner than the cutting blade 60 of the 4-minute screw, so by interposing the spacer 40 between the back surface 51b of the cutting blade 50 and the mounting recess 811, the blade surface 51a of the cutting blade 50 is thinner than the cutting blade 60 of the 4-minute screw. is at the same height as the blade surface 61a of the cutting blade 60. When attaching the cutting blade 50 to the attachment recess 821 of the movable arm 82, the method of attaching the cutting blade 60 is the same, except that the spacer 40 is interposed between the back surface 51b of the cutting blade 50 and the attachment recess 821. Note that the spacer 40 used when attaching the cutting blade 50 to the fixed arm 81 and the spacer 40 used when attaching the cutting blade 50 to the movable arm 82 are of the same shape and size.

The shape of the spacer 40 will be described with reference to FIG. 9. The spacer 40 has a flat plate shape that is substantially rectangular in plan view. The thickness of the spacer 40 is equal to the difference in thickness between the two cutting blades 60 and 50. The spacer 40 has a spacer body 41, a through hole 42, a recess 43, and a positioning protrusion 44. The spacer main body 41 has a flat plate shape that is substantially rectangular in plan view. The through hole 42 is a hole through which the bolt B1 passes, and extends through the spacer body 41 in the thickness direction at approximately the center thereof. The recess 43 is a portion that overlaps with the movable recess 52 or the fixed recess 53 of the cutting blade 50, and is recessed in a substantially semicircular shape from the end surface of the spacer main body 41 toward the center of the spacer main body 41, and is recessed in the thickness direction of the spacer main body 41. It penetrates through. The positioning protrusion 44 is a portion that is fitted into the positioning recess 811e of the fixed arm 81 or the positioning recess 821e of the movable arm 82, and projects from the end surface of the spacer body 41 toward the outer circumferential side of the spacer body 41 in a substantially semicircular shape. .

As shown in FIG. 8, when the cutting blade 50 is attached to the attachment recess 811 of the fixed arm 81, the spacer 40 is interposed between the back surface 51b of the cutting blade 50 and the attachment recess 811. In this state, the positioning protrusion 44 of the spacer 40 fits into the positioning recess 811e of the attachment recess 811. Thereby, the spacer 40 is positioned and arranged within the attachment recess 811. In this state, the through hole 42 and the recess 43 of the spacer 40 overlap with the through hole 811i and the recess 811g of the attachment recess 811, respectively. When the cutting blade 50 is attached to the attachment recess 821 of the movable arm 82, the spacer 40 is interposed between the back surface 51b of the cutting blade 50 and the attachment recess 821, as described above. However, in this case, the positioning protrusion 44 of the spacer 40 fits into the recess 821e of the attachment recess 821, and the side surface 45 of the spacer 40 contacts the positioning protrusion 821f of the attachment recess 821. Thereby, the spacer 40 is positioned and disposed within the attachment recess 821.

(5) Description of operation of cutting tool Next, operation of the cutting tool 1 will be explained.

In the following description, the operation of the cutting tool 1 of this embodiment and the operation of the cutting tool 1H of the comparative example will be explained. The cutting tool 1H of the comparative example shows the operation when cutting a 4-minute screw using the cutting blade 60H for a 4-minute screw of the comparative example, and the operation when cutting a 4-minute screw using the cutting blade 50 for a 3-minute screw of the present embodiment. The operation when cutting a screw will be explained.

Moreover, in the cutting tool 1H of the comparative example, the same reference numerals are given to the functionally the same parts as those of the cutting tool 1 of the present embodiment. Moreover, in the cutting blade 60H of the comparative example, the same reference numerals are given to the functionally the same parts as the cutting blade 60 of the present embodiment.

The cutting tool 1H of the comparative example is the same as the cutting tool 1 of the present embodiment except that the range of movement when rotating the movable arm 82 is different. More specifically, the movement range Δα of the movable arm 82 of the cutting tool 1H of the comparative example is larger than the movement range Δβ of the movable arm 82 of the cutting tool 1 of the present embodiment.

The cutting blade 60H for a quarter screw of the comparative example is the same as the cutting blade 60 for a quarter screw of the present embodiment except that the depth of the movable recess 62 is different. More specifically, in the cutting blade 60 of this embodiment, the depth of the movable recess 62 is smaller than the depth of the fixed recess 63 (the same depth as the radius of the quarter screw), but in the cutting blade 60H of the comparative example, , the depth of the movable recess 62 is the same as the depth of the fixed recess 63 (the same depth as the radius of the quarter screw).

Furthermore, in the following description, when the cutting blade 60 is used as a movable blade, it is also referred to as movable blade 60A (second movable blade), and when used as a fixed blade, it is also referred to as fixed blade 60B (second fixed blade). Similarly, when the cutting blade 50 is used as a movable blade, it is also referred to as the movable blade 50A (first movable blade), and when it is used as a fixed blade, it is also referred to as the fixed blade 50B (first fixed blade). Similarly, when the cutting blade 60H of the comparative example is used as a movable blade, it is also referred to as a movable blade 60HA, and when it is used as a fixed blade, it is also referred to as a fixed blade 60HB.

Further, in the following description, the position of the movable blade 60A is expressed by an angle around the rotation axis Q1. In this embodiment, the reference position of this angle is set at a position where the end face 61c of the movable blade 60A exactly overlaps with the end face 61d of the fixed blade 60B when viewed from the rotation axis Q1 direction, but it can basically be set arbitrarily. It is possible. Note that the position of the movable blade 60A means, for example, the position of the end surface 61c of the movable blade 60A. These points (meaning of the above-mentioned angular reference position and the above-mentioned position of the movable blade 60A) are the same for the movable blades 50A and 60HA.

First, with reference to FIG. 10, the operation of the cutting tool 1H of the comparative example when cutting the quarter screw 9A using the cutting blade 60H for the quarter screw of the comparative example will be described.

In the cutting tool 100 of the comparative example, the distance between the fixed blade 60HB and the movable blade 60HA is initially in a fully open state. The position of the movable blade 60HA at this time is at the initial position α1. This position α1 is the starting position of the movement range Δα of the movable arm 82. The quarter screw 9A passes between the fixed blade 60HB and the movable blade 60HA and is held in the fixed recess 63 of the fixed blade 60HB. In this state, if the trigger switch 73 continues to be turned on, the movable arm 82 moves within a moving range Δα from the initial position α1 about the rotation axis Q1 in the direction of the arrow Y1. Due to this rotation, the movable blade 60HA moves in the direction of the fixed blade 60HB, and the quarter screw 9A is cut by the fixed blade 60HB and the movable blade 60HA. Then, the movable blade 60HA moves backward through a movement range Δα from the initial position α1 and returns to the original initial position α1.

More specifically, the movable blade 60HA advances in the direction of arrow Y1 from the initial position α1 to a position (cutting start position) α2 (second position) where the end surface 61c of the movable blade 60HA and the end surface 61d of the fixed blade 60HB exactly overlap. When it reaches , the movable blade 60HA and the fixed blade 60HB start cutting the quarter screw 9A. Then, when the movable blade 60HA advances from the position α2 by the diameter of the quarter screw 9A, the quarter screw 9A is cut. In addition, when moving the movable blade 60HA by the diameter of the screw 9A, in order to reliably cut the screw 9A in consideration of dimensional errors, etc., the movable blade 60HA may be advanced a distance slightly longer than the diameter of the screw 9A. good. The position of the movable blade 60HA at this time is defined as a cutting end position α3. This position α3 is the end position of the movement range Δα of the movable arm 82. Then, the movable blade 60HA moves backward from the position α3 and returns to the original initial position α1. That is, the movable blade 60HA is moved backward and separated from the fixed blade 60HB. Then, when the movable blade 60HA returns to the original initial position α1, it is automatically stopped.

Next, with reference to FIG. 11, the operation of the cutting tool 1H of the comparative example when cutting the 3-minute screw 9B using the cutting blade 50 for the 3-minute screw of the present embodiment will be described.

In this case, when the movable blade 50A advances in the direction of the arrow Y1 from the initial position α1 and reaches a position α2 (cutting start position) where the end face 51c of the movable blade 50A and the end face 51d of the fixed blade 50B exactly overlap, The movable blade 50A and the fixed blade 50B start cutting the three-minute screw 9B. Then, when the movable blade 50A advances from position α2 by the diameter of the three-minute screw 9B, the three-minute screw 9B is cut. The position of the movable blade 50A at this time is defined as a cutting end position α4 (fourth position). After the movable blade 50A moves from the position α4 to the position α3 (the terminal position of the movement range Δα), it moves backward and returns to the original initial position α1.

In this operation, the diameter of the three-minute screw 9B is smaller than the diameter of the four-minute screw 9A, so the three-minute screw 9B is cut faster than the four-minute screw 9A. Therefore, in the direction of arrow Y1 (the direction in which the movable blade 50A approaches the fixed blade 50B), the cutting end position α4 of the 3-minute screw 9B is lower than the cutting end position α3 of the 4-minute screw 9A (the end position of the movable arm 82). will also be in front. Therefore, after cutting the three-minute screw 9B, the movable blade 50A further advances from the position α4 to the position α3 (the terminal position of the movable arm 82). Therefore, while the movable blade 50A is moving between positions α4 and α3, the operator releases the trigger switch 73, causing the problem that the cutting tool 1H stops. There are cases where In the cutting tool 1 of this embodiment, the occurrence of this problem can be suppressed by making the interval between the positions α4 and α3 shorter.

In addition, in the cutting tool 1H of the comparative example, the cutting start position (α2) of the movable blade 60HA when cutting the quarter-minute screw 9A using the cutting blade 60H for the quarter-minute screw of the comparative example, and the cutting start position (α2) of the movable blade 60HA of the present embodiment. The cutting start position (α2) of the movable blade 50A when cutting the 3-minute screw 9B using the cutting blade 50 for the minute screw is the same position.

Next, with reference to FIG. 12, the operation of the cutting tool 1 of this embodiment when cutting the quarter-section screw 9A using the cutting blade 60 for quarter-section screws will be described.

In this case, the movable blade 60A advances from the initial position α1 (starting end position of the movement range Δβ) in the direction of arrow Y1, and reaches a position just before the position α2 where the end face 61c of the movable blade 60A and the end face 61d of the fixed blade 60B exactly overlap. When the position (cutting start position) α5 (first position) is reached, the movable blade 60A comes into contact with the quarter screw 9A, and the movable blade 60A and the fixed blade 60B start cutting the quarter screw 9A. Then, when the movable blade 60A advances from the position α5 by the diameter of the quarter screw 9A, the quarter screw 9A is cut. The position of the movable blade 60A at this time is defined as a cutting end position α6 (third position). After the movable blade 60A moves to the cutting end position α6 (the end position of the movement range Δβ), it moves backward and returns to the original initial position α1.

In this operation (operation when using the cutting blade 60), since the movable recess 62 of the movable blade 60A is approximately semicircular (arc shape) less than the radius of the quarter screw 9A, 60A approaches the fixed blade 60B), the cutting start position α5 of the quarter screw 9A is closer to the cutting start position α2 of the quarter screw 9A when the cutting blade 60H of the comparative example is used. Along with this, the cutting end position α6 of the quarter screw 9A in this operation is also closer to the cutting end position α3 of the quarter screw 9A when the cutting blade 60H of the comparative example is used. Therefore, the movement range Δβ of the cutting tool 1 of this embodiment is set shorter than the movement range Δα of the cutting tool 1H of the comparative example.

Next, with reference to FIG. 13, the operation of the cutting tool 1 of this embodiment when cutting the 3-minute screw 9B using the cutting blade 50 for the 3-minute screw will be described.

In this case, when the movable blade 50A advances in the direction of the arrow Y1 from the initial position α1 and reaches a position α2 (cutting start position) where the end face 51c of the movable blade 50A and the end face 51d of the fixed blade 50B exactly overlap, The movable blade 50A and the fixed blade 50B start cutting the three-minute screw 9B. Then, when the movable blade 50A moves forward from position α2 by the diameter of the three-minute screw 9B, the three-minute screw 9B is cut. The position at this time is defined as the cutting end position α4. After the movable blade 50A moves from the position α4 to the position α6 (the terminal position of the movement range Δβ), it moves backward and returns to the original initial position α1.

In this operation (operation when the cutting blade 50 is used), the movable blade 50A moves from the cutting end position α4 of the three-minute screw 9B to the position α6 (the end position of the movement range Δβ). However, the position α6 is located before the cutting end position α3 of the quarter screw 9B when the cutting blade 60H of the comparative example is used. Therefore, the interval between positions α4 and α6 is shorter than the interval between positions α4 and α3. This allows the operator to move the movable blade 50A between positions α4 and α6, compared to the case where the cutting tool 1H of the comparative example cuts the 3-minute screw 9B using the cutting blade 50 of the embodiment. It is possible to prevent the trigger switch 73 from being pressed halfway. As a result, the occurrence of the above-mentioned problems can be suppressed.

In addition, in the case where the above-mentioned "cutting tool 1H of the comparative example uses the cutting blade 50 of the embodiment to cut the 3-minute screw 9B", the cutting blade 60H for the 4-minute screw of the comparative example is used to cut the 4-minute screw 9A. The cutting start position (α2) of the movable blade 60HA when cutting the 3-minute screw, and the cutting start position (α2) of the movable blade 50A when cutting the 3-minute screw 9B using the cutting blade 50 for the 3-minute screw of this embodiment. ) are at the same position (see FIGS. 10 and 11). This is the cutting start position (α5) of the movable blade 60A when cutting the 4-minute screw 9A using the cutting blade 60 for the 4-minute screw of this embodiment, and the cutting blade for the 3-minute screw of this embodiment. This is a case where the cutting start position (α2) of the movable blade 50A when cutting the 3-minute screw 9B using the blade 50 is the same position.

The movement range Δβ of the cutting tool 1 is determined based on the sum of the diameter of the quarter screw 9A, the depth of the fixed recess 63 of the cutting blade 60 for the quarter screw, and the depth of the movable recess 62 of the cutting blade 60. ing. Similarly, the movement range Δα of the cutting tool 1H is also determined by the diameter of the quarter screw 9A, the depth of the fixed recess 63 of the cutting blade 60H for the quarter screw of the comparative example, and the depth of the movable recess 62 of the cutting blade 60H. It is determined based on harmony. The depth of the movable recess 62 of the cutting blade 60H of the comparative example is a semicircle with the same size as the radius of the quarter screw 9A, whereas the depth of the movable recess 62 of the cutting blade 60 of the present embodiment is It is approximately semicircular (arc-shaped) with a size less than the radius of the quarter screw 9A. That is, the depth of the movable recess 62 of the cutting blade 60 of this embodiment is shallower than the depth of the movable recess 62 of the cutting blade 60H of the comparative example. Therefore, the movement range Δβ of this embodiment is shorter than the movement range Δα of the comparative example. The size of the cutting tools 1, 1H depends on the size of the movement ranges Δβ, Δα. Therefore, the cutting tool 1 of this embodiment can be made smaller than the cutting tool 1H of the comparative example.

Next, with reference to FIG. 14, the action of the inclined blade surface 61a of the cutting blade 60 will be explained. In the following description, the cutting blade 60 as a movable blade is also referred to as a movable blade 60A, the cutting blade 60 as a fixed blade is also referred to as a fixed blade 60B, and the elongated object 9 is referred to as a screw 9.

In this embodiment, the blade surface 61a of the cutting blade 60 is inclined with respect to the back surface 61b of the cutting blade 60. Thereby, the blade surface 61a of the cutting blade 60 is inclined along the thread 9s of the screw 9 arranged between the movable blade 60A and the fixed blade 60B. Therefore, when cutting the screw 9 with the movable blade 60A and the fixed blade 60B, the blade surface 61a of the movable blade 60A and the blade surface 61a of the fixed blade 60B are cut into the screw 9 along the thread 9s (Fig. 14A). Therefore, the screw 9 is cut along the thread 9s. As a result, the occurrence of burrs on the cut surface 9t of the screw 9 can be suppressed. In particular, the occurrence of burrs on the movable blade 60A side of the screw 9 can be suppressed (see FIG. 14B). Note that the reference numeral 91 in FIG. 14B is a cut fragment of the screw 9. Similarly, the inclined blade surface 51a of the cutting blade 50 of this embodiment also has the same effect as the inclined blade surface 61a of the cutting blade 60.

Next, with reference to FIG. 15, the moving speed of the movable blades 60A, 50A will be explained.

In FIG. 15, the vertical axis is the position of the movable blades 60A, 50A (angle around the rotation axis Q1 (see FIGS. 13 and 14)), and the horizontal axis is time. In this embodiment, the movable blade 60A and the movable blade 50A are moved at the same movement speed when cutting a screw.

In FIG. 15, similarly to the above, position α1 is the initial position of the movable blades 60A, 50A (the position where the distance from the fixed blade is in the fully open state). Position α5 (first position) is the position of the movable blade 60A (cutting start position) when the cutting blade 60 is used to start cutting the quarter screw, and is the starting end position of the moving range Δβ of the movable arm 82. . Position α6 (third position) is the position of the movable blade 60A (cutting end position) at the end of cutting the quarter screw when the cutting blade 60 is used, and is the end position of the movement range Δβ of the movable arm 82. . The position α2 (second position) is the position of the movable blade 50A (cutting start position) when the cutting blade 50 is used to start cutting a 3-minute screw. The position α4 (fourth position) is the position of the movable blade 50A (cutting end position) when the cutting blade 50 is used to finish cutting the three-minute screw. Position α7 is a predetermined position between positions α5 and α6. In this embodiment, the position α4 and the position α7 are, for example, the same position.

When cutting a 4-minute thread using the cutting blade 60, as shown in FIG. Move forward at 1 movement speed. Thereby, the movable blade 60A is quickly brought close to the quarter screw that is the object to be cut. Note that forward movement is a direction in which the movable blade 60A approaches the fixed blade 60B. Then, in order to cut the quarter thread, the movable blade 60A decelerates from the cutting start position α5 (time t2) to the intermediate position α7 (time t4) at a second movement speed that is slower than the first movement speed. (first speed). From intermediate position α7 (time t4) to cutting end position α6 (time t5), the movable blade 60A moves at a slightly higher moving speed, and moves at a third moving speed that is faster than the second moving speed and slower than the first moving speed. Move forward at the movement speed (second speed). Then, it moves backward from the cutting end position α6 (the end position of the movement range Δβ) to the original position α1 at a fourth movement speed that is faster than the third movement speed, for example.

Note that the first moving speed is given by the slope between positions α1 and α5 (times t1 and t2) in graph G1 of FIG. 15. The second moving speed is given by the slope between positions α5 and α7 (times t2 and t4) in graph G1. The third movement speed is given by the slope between positions α7 and α6 (times t4 and t5) in graph G1. In addition, in FIG. 15, it is assumed that the moving speed of the movable blade 60A changes smoothly.

In the cutting tool 1, the moving speed of the movable blade 60A (that is, the moving speed of the movable arm 82) is set as described above. Next, under this setting, the operation of the movable blade 50A when cutting a 3-minute thread using the cutting blade 50 will be described.

The movable blade 50A advances at a first movement speed from the initial position α1 (time t1) to a position α5 before the 3-minute thread cutting start position α2 (time t3). Then, the movable blade 50A moves forward from the position α5 at the second movement speed, passes the 3-minute screw cutting start position α2 at the second movement speed (first speed), and passes the 3-minute screw cutting end position α4 (= move forward at the second movement speed to α7). Then, the movable blade 50A moves at a third moving speed (second speed) from the cutting end position α4 to the position α6 (the end position of the moving range Δβ) at a slightly increased moving speed. Then, it retreats from the position α6 to the original initial position α1 at a fourth movement speed that is faster than the third movement speed.

The operation of the movable blades 60A and 50A will be explained in terms of the operation of the movable arm 82 as follows. That is, the movable arm 82 moves forward at the first movement speed from the initial position α1 to the position α5, moves forward at the second movement speed from the position α5, passes through the position α2, and reaches the position α4 (=α7), and then moves forward at the second movement speed from the position α5 to the position α4 (=α7). It moves forward at the third movement speed from to position α6.

In this way, the movable blade 50A for the 3-minute screw moves to the position α6 at the third movement speed faster than the first movement speed during the cutting of the 3-minute screw after cutting the 3-minute screw (after the cutting end position α4). move forward until Therefore, the movable blade 50A can pass between positions α4 and α6 more quickly. As a result, it is possible to prevent the operator from releasing the trigger switch 73 while the movable blade 50A is moving between positions α4 and α6.

In this embodiment, the movable arm 82 and the movable blades 60A, 50A are moved using the driving force of the motor, but at this time, the rotation of the motor is controlled to be constant, and the cam mechanism is used to move the movable arm 82 and the movable blades 60A, 50A. The moving speed of the movable blades 60A and 50A is controlled. Therefore, if the rotational speed of the motor changes due to changes in load, etc., the moving speeds of the movable arm 82 and the movable blades 60A, 50A change accordingly. Further, in this embodiment, the horizontal axis in FIG. 15 is time, but instead of time, it may be the rotation angle of the cam of the above-described cam mechanism.

(Modified example)
Next, modifications of the embodiment will be listed. The following modified examples may be realized in combination as appropriate.

In the above embodiment, the movable recess 62 of the fixed recess 63 and the movable recess 62 of the cutting blade 60 has a substantially semicircular shape (arc shape) with a depth less than the radius of a quarter screw. However, at least one of the fixed recess 63 and the movable recess 62 of the cutting blade 60 may have a substantially semicircular shape (arc shape) with a depth less than the radius of the quarter screw.

In the above embodiment, the first distance L1 is smaller than the second distance L2, but the second distance L2 may be smaller than the first distance L1.

In the above embodiment, the cutting end position α4 of the 3-minute thread is the same as the predetermined position α7, but the cutting end position α4 is located between the predetermined position α7 and the cutting end position α6 of the 4-minute thread. It's okay.

(summary)
The following aspects are disclosed from the embodiments described above.

The cutting tool (1) of the first aspect includes a fixed blade (6), a movable blade (6), and a tool body (7). The fixed blade (6) has a fixed recess (63, 53) for holding a long object (9). The movable blade (6) has a movable recess (62, 52) for holding the elongated object (9), and is movable with respect to the fixed blade (6). The tool body (7) moves the movable blade (6) forward in a direction (H2) in which the movable blade (6) approaches the fixed blade (6) in response to the operation of the operating part (73), thereby moving the movable blade (6) and the fixed blade (6) forward. ) to cut the long object (9), and after cutting, move the movable blade (6) backward to separate it from the fixed blade (6). The fixed blade (6) and the movable blade (6) are each replaceable. When cutting a first long object (9B) having a first diameter as a long object (9), a fixed recess (9B) corresponding to the first diameter is used as a fixed blade (6) and a movable blade (6). 53) and a first fixed blade (50B) and a first movable blade (50A) having a movable recess (52). When cutting a second elongated object (9A) having a second diameter larger than the first diameter as the elongated object (9), a second elongated object (9A) is used as a fixed blade (60B) and a movable blade (60A). A second fixed blade (60B) and a second movable blade (60A) having a fixed recess (63) and a movable recess (62) corresponding to the diameter are used. When the second movable blade (60A) and the second fixed blade (60B) are used, the position of the second movable blade (60A) at the time of starting cutting of the second long object (9A) is defined as the first position (α5). , when the first movable blade (50A) and the first fixed blade (50B) are used, the position of the first movable blade (50A) at the time of starting cutting of the first long object (9B) is the second position (α2) shall be. In the direction (H2) in which the movable blade (6) approaches the fixed blade (6), the first position (α5) is located in front of the second position (α2).

According to this configuration, in the direction (H2) in which the movable blade (6) approaches the fixed blade (6), the first position (α5) is located closer to the second position (α2). Therefore, when the second movable blade (60A) and the second fixed blade (60B) are used, the position of the second movable blade (60A) at the end of cutting the second long object (9A) is changed to the third position ( α6), and the position of the first movable blade (50A) at the end of cutting the first long object (9B) when using the first movable blade (50A) and the first fixed blade (50B) is the fourth position. (α4), the interval between the third position (α6) and the fourth position (α4) can be made smaller than when the first position (α5) and the second position (α2) are the same position. As a result, when the first fixed blade (50B) and the first movable blade (50A) are used to cut the first long object (9B), the amount of movement ( (distance between positions α4 and α6) can be reduced. As a result, while the first movable blade (50A) is moving between the fourth position (α4) and the third position (α6), the operator releases the push operation on the operation part (73). You can prevent this from happening.

In the cutting tool (1) of the second aspect, in the first aspect, at least one of the fixed recess (63) of the second fixed blade (60B) and the movable recess (62) of the second movable blade (60A), Shallower than the semicircle of the second diameter.

According to this configuration, the first position (α5) can be placed closer to the second position (α2) in the direction (H2) in which the movable blade (6) approaches the fixed blade (6) by a simple method.

In the cutting tool (1) of the third aspect, in the first or second aspect, the second movable blade (60A) and the second fixed blade (60B) are used. The first long object (9B) when the position of the second movable blade (60A) at the end of cutting is set to the third position (α6) and the first movable blade (50A) and the first fixed blade (50B) are used. The position of the first movable blade (50A) at the end of cutting is defined as the fourth position (α4). In the direction (H2) in which the movable blade (6) approaches the fixed blade (6), the first position (α5) is located in front of the second position (α2), so that the first position (α5) and the second position The interval between the third position (α6) and the fourth position (α4) is smaller than that in the case where the position (α2) is the same position.

According to this configuration, the distance between the third position (α6) and the fourth position (α4) becomes small. Therefore, when the first fixed blade (50B) and the first movable blade (50A) are used to cut the first long object (9B), the amount of movement of the first movable blade (50A) forward after cutting is Can be reduced.

In the cutting tool (1) of the fourth aspect, in any one of the first to third aspects, the second movable blade (60A) and the second fixed blade (60B) are used. The position of the second movable blade (60A) at the end of cutting the length object (9A) is defined as the third position (α6). When the first movable blade (50A) and the first fixed blade (50B) are used, the position of the first movable blade (50A) at the end of cutting the first long object (9B) is the fourth position (α4). do. The first movable blade (50A) moves forward at the first speed up to the fourth position (α4), and moves forward at the second speed faster than the first speed from the fourth position (α4) to the third position (α6). Advance. Alternatively, the first movable blade (50A) moves forward at the first speed to a predetermined position (α7) before the fourth position (α4), and passes through the fourth position (α4) from the predetermined position (α7). The robot moves forward at the second speed until it reaches the third position (α6).

According to this configuration, when the first fixed blade (50B) and the first movable blade (50A) are used to cut the first elongated object (9B), the first movable blade (50A) is placed in the fourth position ( It is possible to pass between α4) and the third position (α6) at a second speed faster than the first speed during cutting of the first long object (9B). As a result, while the first movable blade (50A) is moving between the fourth position (α4) and the third position (α6), the operator releases the push operation on the operation unit (73). You can further prevent yourself from doing it.

In the cutting tool (1) of the fifth aspect, in any one of the first to fourth aspects, the tool body (7) is connected to the movable blade (6) after cutting the long object (9). When the movable blade (6) is moved backward until the distance between it and the fixed blade (6) is fully opened, the movable blade (6) is stopped.

According to this configuration, after cutting the long object (9), when the movable blade (6) is moved backward until the distance between the movable blade (6) and the fixed blade (6) is fully opened, the movable blade ( 6) can be stopped.

In the cutting tool (1) of the sixth aspect, in any one of the first to fifth aspects, the first fixed blade (50B) and the first movable blade (50A) each cut the spacer (40). It is attached to the tool body (7) through the tool body (7).

According to this configuration, the cutting tool (1) to which the cutting blade (60) (second fixed blade (60B) and second movable blade (60A)) for cutting the second long object (9A) can be attached In this case, the cutting blade (50) (first fixed blade (50B) and first movable blade (50A)) for cutting the first elongated object (9B) can be appropriately attached.

1 Cutting tool 6 Cutting blade (fixed blade, movable blade)
7 Tool body 9 Long object 9A 4-minute screw (second long object)
9B 3 minute screw (first long item)
40 Spacer 50 Cutting blade for 3 minute screw 50A Movable blade (first movable blade)
50B Fixed blade (1st fixed blade)
52 Movable recess 53 Fixed recess 60 Cutting blade for quarter screw 60A Movable blade 60B Fixed blade 61c End surface (first surface)
61d End surface (second surface)
62 Movable recess 63 Fixed recess 64 Mounting hole (mounting part)
600 Movable blade part 610 Fixed blade part 73 Trigger switch (operation part)
α2 position (second position)
α4 position (4th position)
α5 position (1st position)
α6 position (3rd position)
Δβ Movement range L1 First distance L2 Second distance P1 Center

Claims (6)

a fixed blade having a fixed recess for holding a long object;
a movable blade having a movable recess for holding the elongated object and movable with respect to the fixed blade;
In response to an operation of an operating section, the movable blade is moved forward in a direction approaching the fixed blade, the long object is cut by the movable blade and the fixed blade, and after the cutting, the movable blade is moved backward. a tool body that separates the movable blade from the fixed blade,
The fixed blade and the movable blade are each replaceable,
When cutting a first elongated object having a first diameter as the elongated object, a first elongated object having the fixed recess and the movable recess corresponding to the first diameter is used as the fixed blade and the movable blade. A fixed blade and a first movable blade are used,
When cutting a second long object having a second diameter larger than the first diameter, the fixed recess corresponding to the second diameter is used as the fixed blade and the movable blade. and a second fixed blade and a second movable blade having the movable recess,
When the second movable blade and the second fixed blade are used, the position of the second movable blade at the time of starting cutting of the second long object is a first position, and the first movable blade and the first fixed blade are used. When using a blade, the position of the first movable blade at the time of starting cutting of the first long object is a second position,
In the direction in which the movable blade approaches the fixed blade, the first position is closer to the second position than the second position.
cutting tools. At least one of the fixed recess of the second fixed blade and the movable recess of the second movable blade is shallower than a semicircle of the second diameter;
A cutting tool according to claim 1. When the second movable blade and the second fixed blade are used, the position of the second movable blade at the end of cutting the second long object is a third position, and the first movable blade and the first fixed blade are in a third position. When using a blade, the position of the first movable blade at the end of cutting the first long object is a fourth position,
In the direction in which the movable blade approaches the fixed blade, the first position is closer to the second position than the second position, compared to a case where the first position and the second position are the same position, the distance between the third position and the fourth position becomes smaller;
The cutting tool according to claim 1 or 2. When the second movable blade and the second fixed blade are used, the position of the second movable blade at the end of cutting the second long object is a third position, and the first movable blade and the first fixed blade are in a third position. When using a blade, the position of the first movable blade at the end of cutting the first long object is a fourth position,
The first movable blade moves forward at a first speed to the fourth position, moves forward at a second speed faster than the first speed from the fourth position to the third position, or moves forward at a second speed faster than the first speed from the fourth position to the third position. 1. The movable blade advances at the first speed from the first position to a predetermined position before the fourth position, and from the predetermined position to the third position after passing through the fourth position. move forward at second speed,
The cutting tool according to any one of claims 1 to 3. After cutting the long object, the tool body moves the movable blade backward until the distance between the movable blade and the fixed blade becomes fully open, and then stops the movable blade.
The cutting tool according to any one of claims 1 to 4. The first fixed blade and the first movable blade are each attached to the tool body via a spacer,
The cutting tool according to any one of claims 1 to 5.

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