Work equipment

Abstract

To improve workability.SOLUTION: An electric cutter 10 has a guide mechanism 80 which guides forward and rearward movement of a blade 72 and operates the guide mechanism 80 to change a direction of the blade 72 as seen in an anteroposterior direction. Specifically, a guide plate 81 of the guide mechanism 80 is rotated around an axis of an inner guide 45 by manual operation of a worker to change the direction of the blade 72 as seen in the anteroposterior direction. Thus, the direction of the blade 72 relative to a workpiece W placed in front of the blade 72 can be changed. The structure allows the direction of the blade 72 relative to the workpiece W to be changed without changing a direction of the entire electric cutter 10 relative to the workpiece W. Therefore, workability of the electric cutter 10 can be improved.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] The electric reciprocating tool (working machine) described in Patent Document 1 below includes a motor, a screw shaft connected to the motor, a shuttle screw screwed onto the screw shaft, and a movable blade attached to the shuttle screw. When the motor is driven, the shuttle screw moves relative to the screw shaft in the axial direction, so that the movable blade reciprocates in the front-rear direction. Thereby, cutting work can be performed on the material to be cut disposed on the front side of the movable blade.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above electric reciprocating tool, although power transmission is performed by screw engagement, the movable blade may rotate around the axis of the screw shaft, which may reduce workability. Further, when changing the direction of the movable blade with respect to the material to be cut during the cutting work of the above electric reciprocating tool, it is necessary to change the overall direction of the electric reciprocating tool with respect to the material to be cut. For this reason, workability may be reduced.

[0005] In view of the above facts, an object of the present invention is to provide a working machine capable of improving workability.

Means for Solving the Problems

[0006] One or more embodiments of the present invention include a motor, a housing that houses the motor, an output portion that is rotated by the motor, a moving member that is screwed to the output portion and moves as the output portion rotates, a blade that is supported by the moving member and is reciprocable between an initial position and a reverse position as the moving member moves, and configured to be centered around the moving direction of the moving member is supported by the housing rotatably and a guide mechanism that restricts rotation of the blade about the moving direction of the moving member. The guide mechanism and the moving member are capable of relative rotation centered around the moving direction of the moving member, and each is capable of rotation centered around the moving direction of the moving member with respect to the housing. The blade is configured to rotate about the moving direction of the moving member together with the moving member when the guide mechanism is rotated with respect to the housing. The outer surface of the blade and the inner surface of the guide mechanism are separable. When the blade is operated by the motor, the blade contacts the inner surface of the guide mechanism, so that the movement of the blade in the moving direction of the moving member is guided while the rotation of the blade around the moving direction of the moving member is restricted. By the operator Rotation of the guide mechanism In a state where it is possible, the rotation of the guide mechanism is restricted to a predetermined angular range by a stopper provided on the housing, and is a working machine.

[0007] One or more embodiments of the present invention are working machines in which the guide mechanism has a guide portion that can contact the blade.

[0008] One or more embodiments of the present invention are working machines in which the guide portion is located at a position spaced apart from the moving member in a direction orthogonal to the moving direction of the moving member.

[0009] One or more embodiments of the present invention are working machines configured such that at least a part of the blade located at the reverse position can contact the guide mechanism.

[0010] One or more embodiments of the present invention have a head portion capable of supporting a workpiece to be cut by the blade, the head portion is configured to sandwich the blade located at the reverse position, and the guide portion is a working machine that restricts rotation of the blade so that the blade moving from the initial position to the reverse position does not contact the head portion.

[0011] One or more embodiments of the present invention include a motor, a housing that houses the motor, a moving member that moves along a first direction by the driving force of the motor, a tip tool connected to the moving member, a guide portion that restricts rotation of the tip tool about the first direction and guides movement of the tip tool along the first direction, and an engaging portion that can engage with a workpiece. rotated and connected to the housing A guide mechanism, and the guide mechanism The guide mechanism and the moving member are configured to be capable of relative rotation around the first direction as an axis, and each is rotatable centered around the first direction relative roll to the housing configuration and is , when the guide mechanism is relatively rotated with respect to the housing, the tip tool is urged by the guide mechanism that rotates relative to the moving member, so that the moving member is configured to rotate around the first direction with respect to the housing. The moving member is supported so as to be movable in the first direction and rotatable around the first direction inside the inner portion of the support portion provided in the housing, and the guide mechanism is supported so as to be rotatable around the first direction with respect to the housing outside the support portion. a working machine.

[0012] One or more embodiments of the present invention are such that the guide mechanism is connected to the housing so as to be rotatable about the first direction, and when the guide mechanism rotates, the orientation of the tip tool is changed relative to the housing, and it is a working machine. rotate around as an axis One or more embodiments of the present invention are such that the housing houses an output shaft connected to the motor, the moving member is screw-engaged with the output shaft, and when the output shaft rotates by the driving force of the motor, the moving member moves in the axial direction of the output shaft, and when the guide mechanism rotates, the guide mechanism and the tip tool rotate, and it is a working machine. rotation One or more embodiments of the present invention are such that the tip tool is a plate-shaped blade, the guide mechanism includes a rotary shaft that is rotatably connected to the housing and is arranged coaxially with the output shaft, and a pair of guide members that are integrally rotatably connected to the rotary shaft and sandwich the tip tool to restrict rotation of the tip tool about the axis of the output shaft, and it is a working machine. rotation One or more embodiments of the present invention are such that the guide mechanism is rotatably connected to the housing and is arranged coaxially with the output shaft, and a pair of guide members that are integrally rotatably connected to the rotary shaft and sandwich the tip tool to restrict rotation of the tip tool about the axis of the output shaft, and it is a working machine.

[0013] One or more embodiments of the present invention are such that the housing houses an output shaft connected to the motor, the moving member is screw-engaged with the output shaft, and when the output shaft rotates by the driving force of the motor, the moving member moves in the axial direction of the output shaft, and when the guide mechanism rotates, the guide mechanism and the tip tool rotate, and it is a working machine. has rotated around the first direction One or more embodiments of the present invention are such that the tip tool is a plate-shaped blade, the guide mechanism includes a rotary shaft that is rotatably connected to the housing and is arranged coaxially with the output shaft, and a pair of guide members that are integrally rotatably connected to the rotary shaft and sandwich the tip tool to restrict rotation of the tip tool about the axis of the output shaft, and it is a working machine. centered around the first direction One or more embodiments of the present invention are such that the housing houses an output shaft connected to the motor, the moving member is screw-engaged with the output shaft, and when the output shaft rotates by the driving force of the motor, the moving member moves in the axial direction of the output shaft, and when the guide mechanism rotates, the guide mechanism and the tip tool rotate, and it is a working machine.

[0014] One or more embodiments of the present invention are such that the tip tool is a plate-shaped blade, the guide mechanism includes a rotary shaft that is rotatably connected to the housing and is arranged coaxially with the output shaft, and a pair of guide members that are integrally rotatably connected to the rotary shaft and sandwich the tip tool to restrict rotation of the tip tool about the axis of the output shaft, and it is a working machine.

[0015] One or more embodiments of the present invention are work machines in which the rotating shaft is formed in a cylindrical shape and the moving member is movably supported by the rotating shaft.

[0016] One or more embodiments of the present invention are work machines in which a stopper for defining the range of the guide mechanism is provided in the housing. rotation

[0017] One or more embodiments of the present invention are A motor, a housing that houses the motor, a moving member that moves along the first direction by the driving force of the motor, a tip tool connected to the moving member, a guide portion that restricts the rotation of the tip tool around the first direction and guides the movement of the tip tool along the first direction, and an engaging portion that can engage with a workpiece, and further includes a guide mechanism rotatably connected to the housing. A stopper that defines the rotation range of the guide mechanism is provided on the housing. work machines in which a magnet configured to be able to contact the guide mechanism is provided on the stopper, and the contact state between the guide mechanism and the stopper is maintained by the magnetic force of the magnet.

[0018] One or more embodiments of the present invention are work machines in which a movement restricting member is provided between the housing and the guide mechanism, and the movement restricting member restricts the relative movement of the guide mechanism with respect to the housing when the motor is driven, and permits the relative movement of the guide mechanism with respect to the housing when an operating force exceeding a predetermined value is applied to the guide mechanism by an operator. centered around the first direction relative rotation centered around the first direction relative rotation

[0019] One or more embodiments of the present invention are work machines in which the movement restricting member restricts the relative movement of the guide mechanism with respect to the housing when the motor is driven by the frictional force generated between the housing and the guide mechanism. rotation

[0020] One or more embodiments of the present invention are work machines in which the movement restricting member is provided so as to be integrally movable with the guide mechanism, a locking portion is formed on the movement restricting member, and at an intermediate position within the operating range of the guide mechanism, the locking portion is directly or indirectly locked to the housing to restrict the relative rotation of the guide mechanism with respect to the housing. ​​​​One or more embodiments of the present invention include a motor, a housing that houses the motor, A screw portion that rotates in a first rotation direction or a second rotation direction opposite to the first rotation direction about a first direction as an axis by the motor, and a screw portion that engages with the screw portion and moves in one direction of the first direction by rotation of the screw portion in the first rotation direction, and by rotation of the screw portion in the second rotation direction in the other direction of the first direction, by the driving force of the motor the a moving member that moves along a first direction reciprocating drive and a tip tool connected to the moving member, operates in the first direction integrally with the moving member in either case where the screw portion rotates in the first rotation direction or where the screw portion rotates in the second rotation direction, a guide portion that transmits the rotational force of the motor and restricts the tip tool from rotating about the first direction, and the tip tool when the moving member moves in the first direction, is restricted from rotating about the first direction by the guide portion is before even in a state where is it is restricted, while it is possible to move the moving member via the screw portion by the motor but is configured to be rotatable about the first direction when an operator applies a biasing force to the tip tool to rotate it about the first direction. It is a working machine. The tip tool is One or more embodiments of the present invention are a motor, a housing that houses the motor, a moving member that moves along a first direction by the driving force of the motor, a tip tool connected to the moving member, a guide portion that restricts rotation of the tip tool about the first direction when the rotational force of the motor is transmitted, and an elastic member that suppresses relative rotation of the guide portion about the first direction with respect to the housing by an urging force. The tip tool is configured to be rotatable about the first direction when an operator applies an urging force to rotate the tip tool about the first direction even in a state where rotation about the first direction is restricted by the guide portion. Even in a state where relative rotation of the guide portion about the first direction with respect to the housing is suppressed by the urging force of the elastic member, the operator can relatively rotate the guide portion about the first direction with respect to the housing by directly urging the guide portion, and is configured to be able to perform work with the tip tool in that state. It is a working machine. One or more embodiments of the present invention are working machines in which the guide portion guides movement of the tip tool along the first direction. One or more embodiments of the present invention include a motor, a housing that houses the motor, an output portion that rotates by the motor, a moving member that is screwed to the output portion and moves as the output portion rotates, a blade that is supported by the moving member and is reciprocable between an initial position and an inverted position as the moving member moves, a pair of plate members that sandwich the blade, and an adjustment mechanism that is rotatably supported by the housing about the moving direction of the moving member. By rotating the adjustment mechanism, the rotational position of the blade about the moving direction can be adjusted. In a state where the operator can rotate the adjustment mechanism, a stopper is provided on the housing to restrict the rotation of the moving member within a predetermined angular range. It is a working machine.

Advantages of the Invention

[0021] According to the working machine having the above configuration, workability can be improved.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0023] Hereinafter, the electric cutting machine 10 as a working machine according to the present embodiment will be described with reference to the drawings. The arrows UP, FR, and RH appropriately shown in the drawings indicate the upper side, the front side, and the right side of the electric cutting machine 10, respectively. In the following description, when the up-down, front-back, and left-right directions are used for explanation, unless otherwise specified, they indicate the up-down direction, the front-back direction, and the left-right direction of the electric cutting machine 10. Also, the front-back direction corresponds to the first direction of the present invention.

[0024] As shown in FIGS. 1 and 2, the electric cutting machine 10 is configured as a power tool for performing a cutting process on a workpiece W such as a light ceiling bar used for a suspended ceiling of a building. This workpiece W is formed in a long columnar shape and is formed in a substantially U shape when viewed from its longitudinal direction. The electric cutting machine 10 includes a housing 20, a motor 50, a feed screw mechanism 60 (which is an element grasped as a moving mechanism in a broad sense), a blade 72 as a cutting blade (tip tool), a guide mechanism 80, a holding mechanism 90, and a control unit 100. Hereinafter, each component of the electric cutting machine 10 will be described.

[0025] (Regarding the housing 20) The housing 20 constitutes the outer shell of the electric cutting machine 10 and extends in the front-rear direction as a whole. The housing 20 includes a lifter housing 22 (first housing) that constitutes the front part of the housing 20 and a main body housing 24 (second housing) that constitutes the rear part of the housing 20. The main body housing 24 is formed in a substantially reverse P-shaped hollow shape in a side view seen from the right side, and the lifter housing 22 is formed in a substantially cylindrical shape extending in the front-rear direction. And the front end portion of the main body housing 24 and the rear end portion of the lifter housing 22 are connected via a spacer 26.

[0026] The rear end portion of the main body housing 24 is configured as a handle portion 24A that an operator grips, and the handle portion 24A extends in the vertical direction. A trigger 30 as an operation portion is provided at the upper end portion of the handle portion 24A. The trigger 30 is configured to be pullable rearward, and is turned on when pulled. Also, a trigger switch 31 is provided on the handle portion 24A obliquely downward rearward of the trigger 30. And when the trigger 30 is pulled, the trigger switch 31 is switched from the off state to the on state.

[0027] The trigger switch 31 is electrically connected to a control unit 100 described later, and the control unit 100 is housed in the lower end portion of the main body housing 24. When the trigger switch 31 is turned on, the trigger switch 31 outputs an on signal to the control unit 100.

[0028] In addition, a battery mounting portion 24B is formed at the lower end portion of the main body housing 24. A battery terminal 28 is provided in the battery mounting portion 24B, and the battery terminal 28 is electrically connected to a control unit 100 described later. A battery 32 is detachably mounted in the battery mounting portion 24B, and the battery 32 has a connector (not shown) connected to the battery terminal 28. Thus, power is supplied to a motor 50 described later via the control unit 100.

[0029] The lifter housing 22 has an integral structure that cannot be divided and is formed in a substantially cylindrical shape. As shown in FIG. 3(A), the front end portion 23 of the lifter housing 22 is formed so as to be spaced apart in the left - right direction. A pair of upper and lower flange portions 23A are formed at the front end portion 23 of the lifter housing 22, and the flange portions 23A extend outward in the vertical direction from the front end portion 23.

[0030] A support mechanism 40 for supporting a lifter 65 of a feed screw mechanism 60 described later is provided at the front end portion 23 of the lifter housing 22. The support mechanism 40 will be described below.

[0031] (Regarding the support mechanism 40) As shown in FIGS. 2, 3(A), and 4(A), the support mechanism 40 includes a pair of left and right fixed plates 41, an outer guide 44 (which is an element grasped as a support member in a broad sense), and an inner guide 45 as a rotating shaft.

[0032] The fixed plate 41 is formed in a substantially long plate shape with the left - right direction as the plate - thickness direction and the up - down direction as the longitudinal direction. A curved portion 41A is formed in the middle portion of the fixed plate 41 in the up - down direction. The curved portion 41A is formed in a substantially arc shape that protrudes outward in the left - right direction corresponding to the outer shape of the lifter housing 22 when viewed from the front side. And the fixed plate 41 is arranged inside the left - right direction of the front - end portion 23 of the lifter housing 22, and the upper end portion and the lower end portion of the fixed plate 41 are adjacently arranged inside the left - right direction of the flange portion 23A of the lifter housing 22.

[0033] Sleeves 42 are respectively spanned over the upper end portions and the lower end portions of the pair of left - right fixed plates 41. The sleeve 42 is formed in a substantially cylindrical shape with the left - right direction as the axial direction, and the pair of fixed plates 41 are fixed to the sleeve 42. Both longitudinal ends of the sleeve 42 protrude outward in the left - right direction from the fixed plate 41, and insertion holes 23B into which both longitudinal ends of the sleeve 42 are inserted are formed through the lifter housing 22. A nut 43 is provided at the left end portion of the sleeve 42. And a bolt BL1 is inserted into the sleeve 42 from the right side and screwed into the nut 43. Thereby, the fixed plate 41 is fixed to the lifter housing 22.

[0034] The outer guide 44 is formed in a substantially cylindrical shape with the front - rear direction as the axial direction. The outer guide 44 is arranged between the curved portions 41A of the pair of fixed plates 41. And both left - right end portions of the outer guide 44 are fastened and fixed to the curved portions 41A of the left - right fixed plates 41 by a pair of front - rear bolts BL2. In the state where the outer guide 44 is fixed to the fixed plate 41, the tip portion of the bolt BL2 protrudes inward in the radial direction of the outer guide 44. Also, in this state, the head portion of the bolt BL2 is arranged in the notch portion 23C formed in the lifter housing 22 (see FIG. 1).

[0035] The inner guide 45 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction. The outer diameter of the inner guide 45 is slightly smaller than the inner diameter of the outer guide 44, and the axial length of the inner guide 45 is set to be longer than the axial length of the outer guide 44. And the rear part of the inner guide 45 is rotatably inserted into the outer guide 44. Further, a pair of front and rear guide grooves 45A are formed on the outer peripheral part of the rear part of the inner guide 45. The guide grooves 45A extend in the circumferential direction of the inner guide 45 and are formed over the entire circumference of the inner guide 45. And the tip of the bolt BL2 is inserted into the guide groove 45A so as to allow relative rotation of the inner guide 45 with respect to the outer guide 44. Thereby, the movement of the inner guide 45 in the front-rear direction is restricted by the bolt BL2.

[0036] As also shown in FIG. 3(B), a pair of upper and lower slits 45B for arranging blades 72 described later are formed in the front part of the inner guide 45. The slits 45B extend in the front-rear direction and penetrate in the up-down direction, and the front end part of the slits 45B is open to the front side. Note that the inner guide 45 constitutes a part of a guide mechanism 80 described later.

[0037] (Regarding the motor 50) As shown in FIG. 2, the motor 50 is configured as a brushless motor and is housed in the front end part of the main body housing 24. The motor 50 includes a drive shaft 51 with the front-rear direction as the axial direction, a substantially cylindrical rotor 52 fixed to the drive shaft 51, and a substantially cylindrical stator 53 arranged on the radially outer side of the rotor 52. The rear end part of the drive shaft 51 is rotatably supported by a motor bearing 54 held by the main body housing 24, and the front end side part of the drive shaft 51 is rotatably supported by a motor bearing 55 held by the spacer 26. A pinion gear 51A is formed at the front end part of the drive shaft 51. The motor 50 is electrically connected to the control unit 100 and is driven under the control of the control unit 100.

[0038] (Regarding the feed screw mechanism 60) As shown in FIGS. 2 and 5, the feed screw mechanism 60 includes a transmission gear 61, a drive shaft 63 as an output shaft (output portion), a lifter 65 as a moving member, and a lifter detection switch 68 as a position detection portion for detecting the position of the lifter 65.

[0039] The transmission gear 61 is formed in a substantially stepped cylindrical shape with the front-rear direction as the axial direction, and the diameter of the front portion of the transmission gear 61 is set larger than the diameter of the rear portion of the transmission gear 61. A concave portion 61A opened to the front side is formed at the center of the front surface of the transmission gear 61. The transmission gear 61 is housed in the housing 20 above the front end portion of the drive shaft 51 of the motor 50, and the rear portion of the transmission gear 61 is rotatably supported by a gear bearing 62 held by a spacer 26. A gear portion 61B is formed on the outer peripheral portion of the front portion of the transmission gear 61, and the gear portion 61B is meshed with the pinion gear 51A of the drive shaft 51.

[0040] The drive shaft 63 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction. The drive shaft 63 is housed in the lifter housing 22 and is arranged coaxially with the transmission gear 61 in front of the transmission gear 61. Then, the rear end portion of the drive shaft 63 is integrally and rotatably fitted into the concave portion 61A of the transmission gear 61, and the rear end side portion of the drive shaft 63 is rotatably supported by a shaft bearing 64 held by the lifter housing 22. Thus, when the motor 50 is driven, the drive shaft 63 rotates. A male screw 63A is formed on the outer peripheral portion of the drive shaft 63 except for the rear end portion.

[0041] The lifter 65 is formed in a substantially elongated shape extending in the front-rear direction as a whole. The lifter 65 includes a lifter main body 66 and a lifter connecting portion 67 that constitutes the rear end portion of the lifter 65. The lifter connecting portion 67 is formed in a substantially stepped cylindrical shape with the front-rear direction as the axial direction. A female thread 67A is formed on the inner peripheral portion of the rear portion of the lifter connecting portion 67. The front portion of the drive shaft 63 is inserted into the inside of the lifter connecting portion 67, and the male thread 63A of the drive shaft 63 and the female thread 67A of the lifter connecting portion 67 are screwed together. That is, the drive shaft 63 and the lifter 65 are threadedly engaged.

[0042] Thus, when the drive shaft 63 rotates, the lifter 65 is configured to move in the front-rear direction (the axial direction of the drive shaft 63). Specifically, the lifter 65 reciprocates between an initial position (the position shown in FIG. 2) and an inverted position (the position shown in FIG. 5). Note that the rotation of the lifter 65 when the drive shaft 63 rotates is restricted by a guide mechanism 80 described later. The inverted position may also be referred to as a terminal position.

[0043] A detected portion 67B is formed on the outer peripheral portion of the rear end portion of the lifter connecting portion 67. The detected portion 67B is formed in a substantially cylindrical shape that protrudes radially outward of the lifter main body 66 and has the front-rear direction as the thickness direction.

[0044] The lifter main body 66 is formed in a substantially bottomed cylindrical shape that is open to the rear side. The rear end portion of the lifter main body 66 is fitted into the front portion of the lifter connecting portion 67, and the lifter connecting portion 67 and the lifter main body 66 are connected so as not to be relatively movable. At the initial position of the lifter 65, the front portion of the drive shaft 63 is inserted into the inside of the lifter main body 66 so as to be relatively movable. The front end portion of the lifter main body 66 is inserted into the inner guide 45 of the support mechanism 40 described above and is supported by the inner guide 45 so as to be relatively movable in the front-rear direction.

[0045] An outer peripheral portion of a rear end side of the lifter main body 66 is formed with a lifter flange 66A, and the lifter flange 66A is formed in a disk shape protruding radially outward of the lifter main body 66. And at the inversion position of the lifter 65, the lifter flange 66A is disposed in proximity to the rear side of the inner guide 45. Note that in the connected state of the lifter main body 66 and the lifter connecting portion 67, the front end of the lifter connecting portion 67 is disposed adjacent to the rear side of the lifter flange 66A of the lifter main body 66.

[0046] The lifter detection switch 68 is configured as a lever-type microswitch and is disposed outside the lifter housing 22 (below the rear end portion). The lifter detection switch 68 is housed in a switch cover 69 (third housing) supported (fixed) by the lifter housing 22 and is held by the switch cover 69. In this way, in order to detect the position of the lifter 65 housed in a housing portion (lifter housing 22) different from the housing 20 that houses the control unit 100, the lifter detection switch 68 is housed in a housing region (switch cover 69) different from the main body housing 24 that houses the control unit 100 and the lifter housing 22 that houses the lifter 65. The switch cover 69 is a position detection unit housing that houses the lifter detection switch 68 (position detection unit). The lifter detection switch 68 is supported within a space surrounded by an outer wall of the main body housing 24, an outer wall of the lifter housing 22, and an inner wall of the switch cover 69. The switch cover 69 may be configured to be supported by the main body housing 24, or may be configured to be connected to and supported by both the lifter housing 22 and the main body housing 24.

[0047] Further, a spherical ball 70 is provided above the lifter detection switch 68, and the ball 70 is disposed in a ball hole 22A formed at the lower end of the outer periphery of the lifter housing 22. The ball hole 22A penetrates in the vertical direction, and the diameter of the ball hole 22A increases downward. In the off state of the lifter detection switch 68, the outer peripheral surface of the ball 70 abuts against the lever portion of the lifter detection switch 68 and the inner peripheral surface of the ball hole 22A (see FIG. 5). Also, in this state, a part of the outer peripheral portion of the ball 70 protrudes radially inward with respect to the inner peripheral surface of the lifter housing 22 so as to be disposed inside the lifter housing 22. The ball 70 is a transmission member for transmitting the operation of the lifter 65 to the lifter detection switch 68. The ball hole 22A is a communication hole that communicates the inside of the lifter housing 22 and the inside of the switch cover 69.

[0048] When the lifter 65 is disposed at the initial position, the outer peripheral portion of the detected portion 67B of the lifter 65 presses the ball 70 radially outward (downward), and the ball 70 is displaced toward the lifter detection switch 68 side (downward). That is, when the lifter 65 reaches the initial position during the movement of the lifter 65 from the inverted position to the initial position on the return path side, the ball 70 presses the lever portion of the lifter detection switch 68, and the lifter detection switch 68 is configured to switch from off to on. Further, the lifter detection switch 68 is electrically connected to the control unit 100 and outputs a detection signal to the control unit 100. That is, the lifter detection switch 68 is configured to transmit an on signal to the control unit 100 when pressed by the ball 70.

[0049] (Regarding the blade 72) As shown in FIGS. 1, 2, 3(B), and 4(A), the blade 72 is formed in a plate shape with the left - right direction as the plate - thickness direction. That is, the blade 72 has a plate shape extending in the front - rear direction and the up - down direction. And the rear end portion of the blade 72 is fixed to the front end portion of the lifter 65. Specifically, a step portion 66C (see FIG. 4(A)) is formed at the front end portion of the lifter body 66, and the middle portion in the up - down direction of the rear end portion of the blade 72 is locked by a pin P disposed on the step portion 66C. Thereby, the blade 72 is configured to be movable together with the lifter 65 between the initial position and the inverted position. Also, in the state where the blade 72 is fixed to the lifter 65, when viewed from the front side, the blade 72 is arranged so as to overlap the center lines of the lifter 65 and the drive shaft 63.

[0050] The front end portion of the blade 72 is configured as a blade portion 72A for cutting the workpiece W. The blade portion 72A is configured as a single - edge blade and is formed in a substantially V - shaped convex shape toward the front side when viewed from the left - right direction.

[0051] And in the initial position of the blade 72, the blade 72 is arranged on the front side of the lifter housing 22 and on the rear side of the workpiece W. And by moving the blade 72 forward from the initial position, a cutting process is performed on the workpiece W. Further, in the inverted position of the blade 72, it is set so that the cutting process on the workpiece W is completed.

[0052] (Regarding the guide mechanism 80) As shown in FIGS. 1, 2, 3(B), and 4 to 6, the guide mechanism 80 (adjustment mechanism) includes the inner guide 45 of the support mechanism 40 described above, guide plates 81 as a pair of left and right guide members, a connecting member 82, and a pair of left and right head plates 83 as head portions. The head plate 83 is a member that covers the blade 72 in the inverted position from the left and right, and functions as a member (support portion) for supporting the workpiece W. Note that although the workpiece W may be fixed to a specific location (such as a wall or ceiling), in the present invention, a state in which the workpiece W in such a fixed state is engaged with the head plate 83 is also regarded as a state in which the workpiece W is supported by the head plate 83. Further, the guide mechanism 80 is connected to the housing 20.

[0053] The guide plate 81 is formed in a substantially rectangular plate shape with the left-right direction as the plate thickness direction. A curved portion 81A (see FIG. 3(B)) is formed in the middle portion in the vertical direction of the guide plate 81. The curved portion 81A is formed in a substantially arc shape that protrudes outward in the left-right direction corresponding to the outer shape of the inner guide 45 when viewed from the front side. The curved portion 81A is disposed outside the inner guide 45 in the radial direction and is fastened and fixed to the inner guide 45 by a pair of front and rear bolts BL3. Thereby, the guide plate 81 is integrally rotatably connected to the inner guide 45. In other words, the guide mechanism 80 is rotatably connected to the housing 20 with the front-rear direction as the axial direction. That is, the inner guide 45 is configured as the rotation axis of the guide mechanism 80 and also as the bearing member of the lifter 65.

[0054] Further, the upper portion of the guide plate 81 above the curved portion 81A is configured as a guide portion 81B, and the lower portion of the guide plate 81 below the curved portion 81A is configured as a connecting portion 81C. The guide portions 81B of the pair of guide plates 81 are arranged to face each other with a predetermined gap in the left-right direction, and the connecting portions 81C of the pair of guide plates 81 are arranged to face each other with a predetermined gap in the left-right direction. And, the facing distance of the pair of guide portions 81B is set shorter than the facing distance of the pair of connecting portions 81C and is set slightly longer than the plate thickness of the blade 72. Further, a relief portion 81D (see FIG. 2) is formed at the corner of the rear end portion of the connecting portion 81C, and the relief portion 81D is notched in a concave shape that is open to the rear side and the lower side in a side view.

[0055] The blade 72 is disposed between a pair of guide plates 81. Further, the relative rotation of the guide plate 81 (guide mechanism 80) with respect to the housing 20 is restricted by a holding mechanism 90 described later. Thereby, when the drive shaft 63 rotates, the lifter 65 and the blade 72 are restricted by the guide portion 81B of the guide plate 81 from rotating together with the drive shaft 63, and the blade 72 is configured to reciprocate in the front-rear direction along the guide portion 81B. A slight gap (space) is provided between the guide portion 81B and the blade 72, and the blade 72 is configured to be able to rotate by the amount of this gap, but the gap is of a minute size that does not affect the cutting operation. In particular, the interval of the guide portions 81B is sized to prevent the blade 72 from coming off from the region (lateral interval) between the pair of head plates 83. In other words, the interval of the guide portions 81B is set to a size such that the blade 72 moving toward the inversion position does not contact the head plate 83. More specifically, the interval (lateral gap) between the pair of guide portions 81B is configured to be smaller than the interval (lateral gap) between the pair of head plates 83. Further, in the holding mechanism 90 described later, when a rotational force (operating force) equal to or greater than a predetermined value is applied to the guide plate 81 (guide mechanism 80) by a manual operation of an operator, the relative rotation of the guide plate 81 with respect to the housing 20 is permitted. Thereby, the orientation of the blade 72 as viewed from the front side is changed. Specifically, the orientation of the blade portion 72A of the blade 72 as viewed from the front side is changed. That is, the guide mechanism 80 is also configured as a mechanism portion that changes the orientation of the blade 72 with respect to the workpiece W as viewed from the moving direction of the blade 72 when it operates.

[0056] In this embodiment, the direction of the blade 72 with respect to the workpiece W can be determined in two directions by a stopper 94 described later. Specifically, the stopper 94 can determine the direction of the blade 72 when the guide mechanism 80 is arranged at the first position (the position shown in FIGS. 1 and 2) and the direction of the blade 72 when the guide mechanism 80 is arranged at the second position (the position shown in FIG. 6) where the guide mechanism 80 is rotated 180 degrees from the first position, in two directions.

[0057] The connecting member 82 is formed in a substantially long plate shape with the left-right direction as the plate thickness direction and extending in the front-rear direction. The connecting member 82 is arranged between the connecting portions 81C of the pair of guide plates 81 and is fastened and fixed to the guide plates 81 by bolts BL4.

[0058] The head plate 83 is formed in a plate shape with the left - right direction as the plate - thickness direction. The head plate 83 is disposed in front of the guide plate 81 and on the outer side in the left - right direction of the connecting member 82, and the lower end portion of the head plate 83 is fastened and fixed to the front end portion of the connecting member 82 by a bolt BL4. The head plate 83 functions as a support portion for supporting the workpiece W, and the workability can be improved by having features adapted to the shape of the workpiece W. In the case of the present embodiment, a plurality (four locations in the present embodiment) of head recesses 83A (notches) are formed as recesses at the rear end portion of the head plate 83. The head recesses 83A are formed in a concave shape that is open to the rear side and penetrate in the left - right direction. By configuring in this way, it becomes possible to suitably cut the workpiece W having a U - shaped cross - section. That is, at the time of cutting the workpiece W, both end portions of the workpiece W as viewed from the longitudinal direction of the workpiece W are inserted into the head recesses 83A to set (support) the workpiece W. In this way, the workpiece W is supported by the head plate 83 while a part of it is positioned in the head recesses 83A. In the present embodiment, since the head recesses 83A are provided at four locations, it is possible to cope with cutting of the workpiece W having a width corresponding to the combination of the recesses. Note that the shape of the head recesses 83A can be appropriately changed according to the shape of the workpiece. The head recesses 83A are an example of the notch portion in the support portion of the present invention or the open portion in the support portion.

[0059] (Regarding the holding mechanism 90) As shown in FIGS. 1 to 6, the holding mechanism 90 includes a wave washer 92 as a movement restricting member and a pair of stoppers 94. As shown in FIG. 6, the wave washer 92 is formed in a substantially disc shape with the front-rear direction as the plate thickness direction. The wave washer 92 is disposed between the curved portion 81A of the guide plate 81 and the lifter housing 22, and is configured to restrict the rotation of the guide plate 81 by the frictional force generated between the wave washer 92, the guide plate 81, and the lifter housing 22. More specifically, when the drive shaft 63 rotates by the drive of the motor 50, the lifter 65 and the blade 72 attempt to rotate together with the drive shaft 63, so a rotational force is input from the blade 72 to the guide plate 81. At this time, the shape of the wave washer 92 and the like are set so that the guide plate 81 does not rotate. On the other hand, when a rotational force (operating force) equal to or greater than a predetermined value is input to the guide plate 81 by the manual operation of an operator, the rotation of the guide plate 81 is permitted. That is, the wave washer 92 is configured to function as a so-called torque limiter member.

[0060] As shown in FIGS. 1 to 6, the stopper 94 is configured as a member that determines the rotational position of the guide plate 81 and determines the orientation of the blade 72 with respect to the workpiece W. Specifically, when the guide mechanism 80 rotates (operates) by manual operation, the guide plate 81 abuts against the stopper 94, and the rotation of the guide plate 81 is blocked, thereby determining the orientation of the blade 72 with respect to the workpiece W.

[0061] The stopper 94 includes a fixing portion 94A fixed to the housing 20 and a contact portion 94B configured to be able to contact the guide plate 81. The fixing portion 94A is formed in a substantially rectangular plate shape with the left-right direction as the plate thickness direction. The fixing portions 94A are respectively disposed on the right sides of the upper and lower flange portions 23A in the lifter housing 22 and are fastened together with the lifter housing 22 by bolts BL1.

[0062] The contact portion 94B is formed in a substantially rectangular column shape extending in the left - right direction. The contact portion 94B is disposed on the front side of the lifter housing 22, and the right - end portion of the contact portion 94B is connected to the upper and lower outer end portions of the fixed portion 94A. Then, as shown in FIGS. 1 and 3(B), at the first position of the guide mechanism 80, the upper contact portion 94B contacts the rear - end portion of the guide portion 81B of the guide plate 81 from the right side, restricting the counter - clockwise rotation of the guide mechanism 80 as viewed from the front side. Also, at the first position of the guide mechanism 80, the left - end portion of the lower contact portion 94B is disposed within the relief portion 81D of the guide plate 81, avoiding interference between the guide plate 81 and the lower stopper 94.

[0063] Also, when the guide mechanism 80 is rotated 180 degrees clockwise from the first position as viewed from the front side, the rear - end portion of the guide portion 81B of the guide plate 81 contacts the lower contact portion 94B, restricting the clockwise rotation of the guide mechanism 80 and determining the position of the guide mechanism 80 to the second position (see FIG. 6). At the second position of the guide mechanism 80, the left - end portion of the upper contact portion 94B is disposed within the relief portion 81D of the guide plate 81, avoiding interference between the guide plate 81 and the upper stopper 94. Thus, the pair of stoppers 94 is also configured as a member that determines the operating rotation angle range of the guide mechanism 80. In other words, the pair of stoppers 94 determines the relative rotation angle range of the lifter 65 with respect to the drive shaft 63 during the operation of the guide mechanism 80, restricting the excessive relative movement of the lifter 65 with respect to the drive shaft 63. In the present embodiment, the operating rotation angle range of the guide mechanism 80 is set to 180 degrees by the pair of stoppers 94. That is, the operating range of the guide mechanism 80 is set to be less than one rotation.

[0064] (Regarding the control unit 100) As shown in FIG. 2, the control unit 100 is housed in the lower end portion of the main body housing 24 and held by the main body housing 24. A trigger switch 31, a motor 50, and a lifter detection switch 68 are electrically connected to the control unit 100. The control unit 100 detects the initial position of the lifter 65 based on the detection signal of the lifter detection switch 68. Further, the control unit 100 drives and controls the motor 50 based on the output signals from the trigger switch 31 and the lifter detection switch 68. Then, when the control unit 100 drives the motor 50 forward, the lifter 65 (blade 72) moves forward, and when the control unit 100 drives the motor 50 in reverse, the lifter 65 (blade 72) moves backward.

[0065] Further, when the operation of the trigger 30 is released and the trigger switch 31 is switched from on to off during the forward drive of the motor 50, the control unit 100 is configured to drive the motor 50 in reverse. Furthermore, the control unit 100 has a rotation speed measurement unit 100A that measures the rotation speed of the drive shaft 51 of the motor 50. The rotation speed measurement unit 100A is a circuit board having a plurality of hall ICs and is capable of detecting the magnetism of a permanent magnet provided on the rotor 52. The control unit 100 is configured to be able to detect the rotation position and rotation speed of the rotor 52 (motor 50) based on the signal from the rotation speed measurement unit 100A. Since the rotation speed measurement unit 100A needs to be arranged near the rotor 52, it is arranged separately from the control unit 100 by being connected by a signal line. The control unit 100 can detect how many rotations the motor 50 has made from the initial position based on the signal from the rotation speed measurement unit 100A. Thereby, the control unit 100 detects the reverse position of the lifter 65 (blade 72) based on the rotation speed of the motor 50 starting from the initial position of the lifter 65. Furthermore, when the control unit 100 detects the reverse position of the lifter 65 (blade 72), it is configured to switch the motor 50 from forward rotation to reverse rotation. Thus, the rotation speed measurement unit 100A functions as a part of the position detection unit. More specifically, the rotation speed measurement unit 100A functions as a reverse position detection unit that detects that the lifter 65 has reached the reverse position. Thus, the position detection unit in the present invention includes the lifter detection switch 68 and the rotation speed measurement unit 100A. Note that the lifter detection switch 68 directly detects the initial position of the lifter 65, and the rotation speed measurement unit 100A indirectly detects the reverse position of the lifter 65. Note that the timing of starting the rotation speed measurement of the motor 50 in the control unit 100 will be described later.

[0066] (Function and Effect) Next, while explaining the operation of the electric cutter 10, the function and effect of the electric cutter 10 of the present embodiment will be described.

[0067] Figure 7 shows a flowchart of the electric cutter 10. As shown in this figure, in the operation of the electric cutter 10, in step 1 (S1), the control unit 100 detects whether the trigger switch 31 is on based on the output signal from the trigger switch 31. That is, the control unit 100 determines whether the trigger 30 has been operated. In step 1, if the trigger switch 31 is not on (in the case of No in step 1), the process returns to step 1. In step 1, if the trigger switch 31 is on (in the case of Yes in step 1), the process proceeds to step 2 (S2).

[0068] In step 2, the control unit 100 detects whether the lifter detection switch 68 is on based on the output signal from the lifter detection switch 68. That is, the control unit 100 determines whether the lifter 65 is arranged at the initial position. In step 2, if the lifter detection switch 68 is on (in the case of Yes in step 2), the process proceeds to step 3 (S3).

[0069] In step 3, the control unit 100 drives the motor 50 to rotate forward. That is, when the control unit 100 detects the operation of the trigger 30 and the initial position of the lifter 65, it drives the motor 50 to rotate forward. As a result, the lifter 65 and the blade 72 move to the front side (forward path side). That is, the lifter 65 and the blade 72 approach the workpiece. After the process of step 3, the process proceeds to step 4 (S4).

[0070] In step 4, the control unit 100 detects whether the on state of the trigger switch 31 is continued based on the output signal from the trigger switch 31. That is, the control unit 100 determines whether the operation of the trigger 30 is continued. In step 4, if the on state of the trigger switch 31 is continued (in the case of Yes in step 4), the process proceeds to step 5 (S5).

[0071] In step 5, the control unit 100 detects whether the lifter detection switch 68 has switched from on to off based on the output signal from the lifter detection switch 68. In step 5, when the lifter detection switch 68 switches to off (in the case of Yes in step 5), the process proceeds to step 6 (S6). That is, in the present embodiment, the position of the lifter 65 where the lifter detection switch 68 has switched from on to off is set as the starting point at the initial position of the lifter 65 moving in the forward path (hereinafter, this position of the lifter 65 is referred to as the initial starting position), and in step 5, the control unit 100 detects the initial starting position of the lifter 65. On the other hand, in step 5, when the lifter detection switch 68 has not switched to off (in the case of No in step 5), the process returns to step 4. That is, when the lifter 65 moving in the forward path at the initial position has not reached the initial starting position, the process returns to step 4.

[0072] In step 6, the control unit 100 starts measuring the rotation speed of the motor 50. Specifically, the control unit 100 starts measuring (counting) the rotation speed of the motor 50 based on the signal from the rotation speed measurement unit 100A. After the process of step 6, the process proceeds to step 7 (S7).

[0073] In step 7, the control unit 100 detects whether the on state of the trigger switch 31 is being continued based on the output signal from the trigger switch 31. That is, the control unit 100 determines whether the operation of the trigger 30 is being continued. In step 7, when the on state of the trigger switch 31 is being continued (in the case of Yes in step 7), the process proceeds to step 8 (S8).

[0074] In step 8, the control unit 100 determines whether the rotation speed of the motor 50 has reached a predetermined rotation speed or more. That is, the control unit 100 determines whether the lifter 65 has reached the inversion position. In step 8, when the rotation speed of the motor 50 has not reached a predetermined rotation speed or more (in the case of No in step 8), the process returns to step 7. In step 8, when the rotation speed of the motor 50 has reached a predetermined rotation speed or more (in the case of Yes in step 8), the process proceeds to step 9 (S9).

[0075] In step 9, the control unit 100 stops the forward driving of the motor 50. After the process of step 9, the process proceeds to step 10 (S10).

[0076] In step 10, the motor 50 is set to the standby state. That is, after stopping the forward driving of the motor 50, the control unit 100 does not perform the drive control of the motor 50, and the motor 50 is set to the standby state. After the process of step 10, the process proceeds to step 11 (S11). Specifically, after stopping the forward driving of the motor 50, the process proceeds to step 11 after a predetermined time has elapsed.

[0077] In step 11, the control unit 100 drives the motor 50 in reverse. As a result, the lifter 65 and the blade 72 move to the rear side (return path side) and separate from the workpiece W. That is, the lifter 65 and the blade 72 are reversed at the reversal position, and the return movement of the lifter 65 and the blade 72 starts. After the process of step 11, the process proceeds to step 12 (S12).

[0078] In step 12, the control unit 100 detects whether or not the lifter detection switch 68 is turned on based on the output signal from the lifter detection switch 68. That is, the control unit 100 determines whether or not the lifter 65 has reached the initial position. In step 12, if the lifter detection switch 68 is not turned on (in the case of No in step 12), the process returns to step 12. On the other hand, in step 12, if the lifter detection switch 68 is turned on (in the case of Yes in step 12), the process proceeds to step 13 (S3).

[0079] In step 13, the reverse driving of the motor 50 by the control unit 100 is stopped. As a result, the lifter 65 stops at the initial position. After the process of step 13, the process proceeds to step 14 (S14). Note that by stopping the reverse driving of the motor 50, the lifter 65 returns to the initial position, but due to the braking time of the motor 50 and the like, the lifter 65 stops at a position that has overrun to the return path side from the initial starting position (hereinafter, this position of the lifter 65 is referred to as the initial stop position).

[0080] In step 14, the control unit 100 detects whether the trigger switch 31 has switched from on to off based on the output signal from the trigger switch 31. That is, the control unit 100 detects whether the operation of the trigger 30 has been released. In step 14, if the trigger switch 31 is not off (in the case of No in step 14), the process returns to step 14. On the other hand, in step 14, if the trigger switch 31 is off (in the case of Yes in step 14), since the operation of the trigger 30 has been released, the operation of the electric cutting machine 10 is terminated.

[0081] In addition, in step 2, if the lifter detection switch 68 is not on (in the case of No in step 2), the process proceeds to step 11. That is, in this case, since the lifter 65 has not returned to the initial position at the start of the operation of the electric cutting machine 10, the process proceeds to step 11 to return the lifter 65 to the initial position.

[0082] Also, in steps 4 and 7, if the on state of the trigger switch 31 is not continued (in the case of No in steps 4 and 7), the process proceeds to step 9. That is, in this case, it is the case where the operation on the trigger 30 by the operator is released during the forward movement of the lifter 65. Therefore, the control unit 100 stops the forward drive of the motor 50 and reverses the motor 50 after a predetermined time has elapsed to return the lifter 65 to the initial position.

[0083] The operation of the above electric cutting machine 10 will be described using the time chart shown in FIG. 8. As shown in this figure, at time T0 when the electric cutting machine 10 is in the non-operating state, the lifter 65 is arranged at the initial stop position. Therefore, at time T0, the lifter detection switch 68 is on. Also, at time T0, since the electric cutting machine 10 is in the non-operating state, the trigger switch 31 is off.

[0084] Then, when the trigger switch 31 is turned on at time T1, the control unit 100 starts driving the motor 50 forward. The output of the motor 50 gradually increases from zero, and the rotational speed of the motor 50 gradually increases from zero. As a result, the lifter 65 moves from the initial stop position toward the forward path side.

[0085] At time T2, the lifter 65 reaches the initial starting position, and the lifter detection switch 68 switches from on to off. As a result, at time T2, the control unit 100 starts measuring the rotational speed of the motor 50. That is, the control unit 100 starts counting the rotational speed of the motor 50.

[0086] At time T3, the lifter 65 reaches the reverse position, and the count of the rotational speed of the motor 50 reaches a predetermined number. As a result, the control unit 100 stops driving the motor 50 forward. That is, the power supplied to the motor 50 becomes zero, and the rotational speed of the motor 50 gradually decreases. Also, at time T3, since the count of the rotational speed of the motor 50 reaches a predetermined number, the control unit 100 resets the count of the rotational speed and returns it to zero.

[0087] At time T4, the rotational speed of the motor 50 becomes zero. Then, at time T5, the control unit 100 starts driving the motor 50 in reverse. The output of the motor 50 gradually increases from zero, and the rotational speed of the motor 50 gradually increases from zero. As a result, the lifter 65 moves from the reverse position toward the return path side. That is, the time from time T3 to time T5 becomes the standby time for putting the motor 50 in the standby state.

[0088] At time T6, the lifter 65 reaches the initial starting position, and the lifter detection switch 68 switches from off to on. As a result, the control unit 100 stops driving the motor 50 in reverse. That is, the output of the motor 50 becomes zero, and the rotational speed of the motor 50 gradually decreases.

[0089] Then, at time T7, the rotational speed of the motor 50 becomes zero, and the lifter 65 reaches the initial stop position.

[0090] In the above time chart, an example is shown in which the operation of the operator on the trigger 30 is released between the time T5 and the time T6. That is, the operation of the trigger 30 is released during the return movement of the lifter 65. For this reason, the reverse driving of the motor 50 by the control unit 100 is continued, and the lifter 65 is returned to the initial position.

[0091] As described above, according to the electric cutting machine 10 of the present embodiment, the feed screw mechanism 60 has a lifter detection switch 68 that detects the initial position of the lifter 65. Then, the control unit 100 detects the initial position of the lifter 65 based on the detection signal of the lifter detection switch 68. Thereby, at the initial position of the lifter 65, the control unit 100 can drive the motor 50 forward to move the lifter 65 from the initial position to the reverse position in the forward path. Further, the control unit 100 detects the reverse position of the lifter 65 based on the rotation speed of the motor 50. Thereby, the motor 50 can be stopped at the reverse position of the lifter 65, and the cutting process on the workpiece W by the blade 72 can be terminated. Then, by the control unit 100 driving the motor 50 in reverse, the lifter 65 can be moved in the return path from the reverse position to the initial position, and the motor 50 can be stopped at the initial position.

[0092] Thus, according to the electric cutting machine 10 of this embodiment, the control unit 100 can detect the initial position and the reverse position based on the detection signal of the lifter detection switch 68 and the rotational speed of the motor 50. That is, the control unit 100 can drive and control the motor 50 to stop the movement of the lifter 65 and the blade 72 at the initial position and the reverse position. That is, in the state where the control unit 100 drives the motor 50 to move the blade 72, even if the trigger 30 is maintained in the on state (pulled state), the motor 50 can be stopped when a part of the blade 72 overlaps the head plate 83 when viewed from the left-right direction or the up-down direction orthogonal to the front-rear direction. Further, in the state where the control unit 100 drives the motor 50 to move the blade 72, the motor 50 can be stopped so that the screwing engagement between the drive shaft 63 and the lifter 65 does not come off. In other words, the motorIn addition, since the workpieces have various shapes ranging from thin ones to those with complex shapes, the timing for stopping the motor 50 can be arbitrarily changed as long as a part of the blade 72 and the head plate 83 overlap when viewed in the left - right direction. That is, when cutting a thin material, it can be stopped or reversed earlier, and when cutting a workpiece W with a complex shape using the head recess 83A, the motor 50 can be stopped or reversed when the blade 72 and the head recess 83A overlap. Furthermore, since the motor 50 automatically stops when the lifter 65 is in the reverse position, the operator can recognize that the processing has been completed. This improves workability. Also, by providing a female screw 67A on the reciprocating lifter 65 and a male screw 63A on the drive shaft 63, the lifter 65 can be configured to operate outside the drive shaft 63, and compared with a configuration where the drive shaft 63 operates inside the lifter 65, the position of the lifter 65 can be easily detected.

[0093] Also, the lifter detection switch 68 is configured to switch from off to on when the lifter 65 reaches the initial position during the return movement from the reverse position of the lifter 65 to the initial position. Furthermore, the control unit 100 starts measuring the rotational speed of the motor 50 starting from the point in time when the lifter detection switch 68 switches from on to off. That is, the control unit 100 starts measuring the rotational speed of the motor 50 starting from the initial starting position of the lifter 65. Thereby, the reverse position of the lifter 65 can be accurately detected.

[0094] That is, as described above, when the lifter 65 returns to the initial position, the control unit 100 stops driving the motor 50 based on the detection signal that switches from off to on of the lifter detection switch 68. At this time, it stops at the initial stop position where the lifter 65 overruns to the return path side from the initial starting position. And this initial stop position varies due to the braking performance of the motor 50 and the like. Therefore, if the measurement of the rotation speed of the motor 50 is started from the initial stop position of the lifter 65, there is a possibility that the reverse position of the lifter 65 cannot be accurately detected.

[0095] In contrast, in the present embodiment, as described above, the control unit 100 starts measuring the rotation speed of the motor 50 starting from the point in time when the lifter detection switch 68 switches from on to off. And since the point in time when the lifter detection switch 68 switches from on to off is constant, by starting the measurement of the rotation speed of the motor 50 from the initial starting position of the lifter 65, the reverse position of the lifter 65 can be accurately detected.

[0096] In particular, in the electric cutting machine 10 of the present embodiment, when the guide mechanism 80 is operated to change the direction of the blade 72, the lifter 65 rotates relative to the drive shaft 63. That is, at this time, the lifter 65 moves in the front-rear direction with respect to the drive shaft 63. For this reason, the initial stop position of the lifter 65 before and after the operation of the guide mechanism 80 is displaced. Therefore, in the electric cutting machine 10 having the guide mechanism 80 for changing the direction of the blade 72, by starting the measurement of the rotation speed of the motor 50 from the initial starting position of the lifter 65, the reverse position of the lifter 65 can be detected well.

[0097] Further, when the control unit 100 detects the reverse position of the lifter 65, after a predetermined time has elapsed, it reversely drives the motor 50 to move the lifter 65 to the return path side. For this reason, it is possible to make the operator recognize that the blade 72 has reached the reverse position and the cutting process on the workpiece W by the blade 72 has ended.

[0098] Also, when the control unit 100 does not detect the initial position of the lifter 65 at the start of the operation of the trigger 30, the control unit 100 reversely drives the motor 50 so as to move the lifter 65 to the return path side. Thereby, after automatically returning the blade 72 to the initial position, the work on the electric cutting machine 10 can be continued.

[0099] Also, when the operation on the trigger 30 is released during the movement of the lifter 65 from the initial position to the forward path side to the reverse position, the control unit 100 reversely drives the motor 50 so as to move the lifter 65 in the return path. Thereby, when the cutting process on the workpiece W is stopped or interrupted, the blade 72 can be automatically returned to the initial position.

[0100] Further, the electric cutting machine 10 has a guide mechanism 80 that guides the forward and backward movement of the blade 72, and restricts the blade 72 from rotating about the forward and backward direction (the moving direction of the lifter 65). In the electric cutting machine 10, since the rotational force is transmitted by the screwing of the drive shaft 63 and the lifter 65, when the motor 50 is rotationally driven, a rotational force about the forward and backward direction is also transmitted to the lifter 65, but the guide mechanism 80 can suppress the blade 72 (lifter 65) from rotating. In particular, since the guide mechanism 80 (guide portion 81B) also functions as a portion that covers the blade 72, the rotation of the blade 72 can be restricted by the covering member of the blade 72. Further, since the guide portion 81B guides (restricts rotation) of the blade 72 at a position spaced apart from the lifter 65 in the vertical direction (radial direction), the force transmitted from the blade 72 trying to rotate to the guide portion 81B can be reduced. And when the guide mechanism 80 operates, the orientation of the blade 72 as viewed from the front and rear direction is changed. Specifically, by manually operating the operator, the guide plate 81 of the guide mechanism 80 is rotated about the axis of the inner guide 45, so that the orientation of the blade 72 as viewed from the front and rear direction is changed. For this reason, the orientation of the blade 72 with respect to the workpiece W disposed on the front side of the blade 72 can be changed. Thereby, the orientation of the blade 72 with respect to the workpiece W can be changed without changing the orientation of the entire electric cutting machine 10 with respect to the workpiece W. In particular, since the blade portion 72A of the blade 72 is configured with a single edge, by operating the guide mechanism 80, the finish surface with respect to the workpiece W can be easily changed. Therefore, the workability of the electric cutting machine 10 can be improved.

[0101] Also, in the feed screw mechanism 60, a lifter 65 is screwed onto a drive shaft 63 whose axial direction is the front-rear direction, and a blade 72 is fixed to the lifter 65. Further, the guide mechanism 80 has a guide plate 81 that guides the movement of the blade 72 in the front-rear direction, and the guide plate 81 is rotatably connected to the lifter housing 22 with the front-rear direction as the axial direction. When the guide mechanism 80 operates, the guide mechanism 80 rotates around the axis of the drive shaft 63. Thereby, the guide plate 81 can rotate the lifter 65 and the blade 72 around the axis of the drive shaft 63 to change the orientation of the blade 72.

[0102] Also, the guide mechanism 80 includes a pair of guide plates 81 and an inner guide 45 that rotatably connects the guide plates 81 to the lifter housing 22. The inner guide 45 is formed in a cylindrical shape with the front-rear direction as the axial direction and supports the lifter 65 so as to be movable in the front-rear direction. Thereby, by utilizing the inner guide 45 which is the rotation axis of the guide plate 81, the lifter 65 can be supported movably. Therefore, an increase in the number of parts of the electric cutting machine 10 can be suppressed, and the electric cutting machine 10 can be downsized.

[0103] Also, a pair of stoppers 94 are provided on the lifter housing 22, and when the guide plate 81 abuts against the contact portion 94B of the stopper 94, the position of the guide mechanism 80 is determined. That is, the orientation of the blade 72 with respect to the workpiece W is determined. Specifically, in the present embodiment, the orientation of the blade 72 when the guide mechanism 80 is disposed at the first position and the orientation of the blade 72 when the guide mechanism 80 is disposed at the second position are shifted by 180 degrees in the rotation direction of the guide mechanism 80. Thereby, the operator can easily determine the position of the guide mechanism 80 and change the orientation of the blade 72.

[0104] Also, the operating range of the guide mechanism 80 is defined by a pair of stoppers 94. Specifically, the rotation angle range of the guide mechanism 80 is defined as 180 degrees by the pair of stoppers 94. Thereby, it is possible to suppress excessive deviation of the initial stop position of the lifter 65 before and after the operation of the guide mechanism 80.

[0105] Also, a wave washer 92 is provided between the lifter housing 22 and the guide plate 81. Then, the relative rotation of the guide mechanism 80 with respect to the housing 20 during the drive of the motor 50 is restricted by the wave washer 92. Also, when an operating force (rotational force) above a predetermined value is applied to the guide mechanism 80 (guide plate 81) by an operator, relative rotation of the guide mechanism 80 with respect to the housing 20 is permitted. Thereby, with a simple configuration, it is possible to permit the operation of the guide mechanism 80 by manual operation of the operator while restricting the relative rotation of the guide mechanism 80 with respect to the housing 20 during the drive of the motor 50.

[0106] In the present embodiment, the control unit 100 detects the reverse position of the lifter 65 by measuring the rotation speed of the motor 50, but the method for detecting the reverse position of the lifter 65 is not limited to this. For example, a reverse position detection switch (micro switch) configured similarly to the lifter detection switch 68 may be provided in the feed screw mechanism 60 to directly detect the reverse position of the lifter 65 by the reverse position detection switch, and the control unit 100 may detect the reverse position of the lifter 65 based on the detection signal from the reverse position detection switch. In this case, the lifter detection switch 68 corresponds to the initial position detection unit of the present invention, and the reverse position detection switch corresponds to the reverse position detection unit of the present invention.

[0107] Also, for example, in the feed screw mechanism 60, instead of the lifter detection switch 68, a contact or non-contact linear sensor may be provided, and the position of the lifter 65 may be detected by the linear sensor. Also in this case, the control unit 100 can detect the initial position and the inversion position of the lifter 65. Further, it may be configured such that the load on the motor 50 increases when the lifter 65 is in the initial position, and the initial position may be detected by detecting the current increase during the load. In this case, the inversion position may be detected as described above by setting the timing when the load on the motor 50 is reduced during forward rotation (the timing when the current value decreases) as the initial position. Thus, the position detection unit in the present invention can be configured using various means, not only mechanical and electronic switches.

[0108] Also, in the present embodiment, the transmission gear 61 is meshed with the pinion gear 51A of the drive shaft 51 of the motor 50, and the drive shaft 63 is connected to the transmission gear 61 so as to be integrally rotatable. Instead of this, for example, the motor 50 may be changed to a stepping motor with a feed screw, and the lifter 65 may be configured to be screw-fitted to the feed screw. In this case, the position detection accuracy of the lifter 65 in the control unit 100 can be further increased. Furthermore, since the transmission gear 61 can be omitted, it can contribute to the miniaturization of the electric cutting machine 10.

[0109] In addition, in the present embodiment, the rotation range of the guide mechanism 80 is restricted by a pair of stoppers 94, and the direction of the blade 72 can be easily changed. In other words, by arranging the guide mechanism 80 at the first position or the second position where it abuts against the stopper 94, the position of the guide mechanism 80 with respect to the housing 20 is determined, and the direction of the blade 72 is changed. That is, although two positioning positions of the guide mechanism 80 for changing the direction of the blade 72 are set, three positioning positions of the guide mechanism 80 may be set. In other words, at an intermediate position between the first position and the second position, the guide mechanism 80 may be positioned so that the guide mechanism 80 can be held at the intermediate position. Hereinafter, this configuration will be described with reference to FIGS. 9 and 10.

[0110] As shown in FIGS. 9 and 10, in this configuration, instead of the wave washer 92, a fixed washer 110 as a movement restricting member is disposed between the guide plate 81 and the lifter housing 22 (fixed plate 41). The fixed washer 110 is formed in a substantially frame plate shape with the front-rear direction as the plate thickness direction. The fixed washer 110 has a pair of upper and lower fixing pieces 112, and the fixing pieces 112 extend in the left-right direction.

[0111] A pair of left and right engaging convex portions 114 are formed on the fixing piece 112, and the engaging convex portions 114 are bent into a substantially U shape that protrudes forward and is open to the rear. Then, with the inner guide 45 (not shown in FIG. 9) inserted through the fixed washer 110, the fixed washer 110 is disposed between the curved portion 81A of the guide plate 81 and the lifter housing 22. Further, a pair of left and right engaging convex portions 114 sandwich the guide portion 81B and the connecting portion 81C of the guide plate 81 from the outside in the left-right direction. Thereby, the fixed washer 110 is integrally rotatably attached to the guide plate 81.

[0112] A locking projection 116 as a locking portion is formed at the center in the left-right direction of the fixing piece 112, and the locking projection 116 is bent into a substantially arc shape that protrudes rearward and is open to the front.

[0113] On one hand, at the front end of the fixed plate 41, a locking recess 41B as a locked portion is formed on the front side of the bolt BL2. The locking recess 41B is formed in a substantially arc shape that is open to the front when viewed in the left-right direction.

[0114] And at the first position or the second position of the guide mechanism 80, the locking protrusion 116 is arranged at a position 90 degrees apart in the rotational direction of the guide mechanism 80 with respect to the locking recess 41B (in FIG. 9(A), the second position of the guide mechanism 80 is shown). And when the guide mechanism 80 is arranged at an intermediate position between the first position and the second position, the locking protrusion 116 fits into the locking recess 41B, and the locking protrusion 116 and the locking recess 41B are engaged in the rotational direction (see FIG. 9(B)). Thereby, the locking protrusion 116 is indirectly locked to the housing 20 via the fixed plate 41, and the rotation of the guide mechanism 80 is preferably suppressed. Also, at this time, a sense of moderation (click feeling) is imparted to the operator. As described above, the positioning positions of the guide mechanism 80 can be set at three positions to limit the rotation of the guide mechanism 80. In particular, as described above, since the guide portion 81B, which is the contact portion between the blade 72 and the guide mechanism 80, is located at a position spaced apart in the vertical direction (radial direction) from the lifter 65 (rotation center), when the blade 72 itself tries to rotate, the rotation of the blade 72 can be suppressed with a small force, and when the operator tries to rotate the blade 72 via the guide mechanism 80, the blade 72 can be rotated with a small force. In the above example, the locking recess 41B is formed in the fixed plate 41, but the locking recess 41B may be formed in the housing 20 and the locking protrusion 116 may be directly locked to the housing 20.

[0115] Further, in the present embodiment, at the first position or the second position of the guide mechanism 80, the guide plate 81 abuts against the contact portion 94B of the stopper 94 to restrict the rotation of the guide mechanism 80. However, a magnet may be embedded in the contact portion 94B, and the guide plate 81 may be made of a steel plate so as to maintain the contact state between the guide plate 81 and the stopper 94 by the magnetic force of the magnet. Thereby, the guide mechanism 80 can be favorably held at the first position or the second position.

Explanation of Reference Numerals

[0116] 10 Electric cutting machine (working machine) 20 Housing 45 Inner guide (rotating shaft) 50 Motor 63 Drive shaft (output portion, output shaft) 65 Lifter (moving member) 72 Blade (tip tool) 80 Guide mechanism 81 Guide plate (guide member) 81B Guide portion 83 Head plate (head portion) 92 Wave washer (movement restricting member) 94 Stopper 110 Fixing washer 116 Locking projection (locking portion) W Workpiece

Claims

1. A motor; a housing that accommodates the motor; an output section rotated by the motor; a moving member that is threadably engaged with the output portion and moves as the output portion rotates; a blade supported by the movable member and reciprocating between an initial position and an inverted position as the movable member moves; a guide mechanism configured to sandwich the blade, supported by the housing so as to be rotatable about the movement direction of the movable member, and configured to restrict rotation of the blade about an axis defined by the movement direction of the movable member; Equipped with the guide mechanism and the moving member are capable of relative rotation about the moving direction of the moving member, and are each capable of rotation about the moving direction of the moving member relative to the housing, the blade is configured to rotate together with the moving member around the moving direction of the moving member when the guide mechanism is rotated relative to the housing, an outer surface of the blade and an inner surface of the guide mechanism can be separated from each other, and when the blade is operated by the motor, the blade comes into contact with the inner surface of the guide mechanism, thereby guiding the movement of the moving member in the movement direction while restricting the rotation of the blade about an axis in the movement direction of the moving member; The work machine further comprises a stopper provided on the housing for restricting the rotation of the guide mechanism within a predetermined angular range when the guide mechanism is rotatable by an operator.

2. The work machine according to claim 1 , wherein the guide mechanism has a guide portion that can come into contact with the blade.

3. The work machine according to claim 2 , wherein the guide portion is located at a position spaced apart from the moving member in a direction perpendicular to the moving direction of the moving member.

4. 4. The work machine according to claim 2, wherein at least a portion of the blade positioned at the inverted position is configured to be able to abut against the guide mechanism.

5. a head portion capable of supporting a workpiece to be cut by the blade; The head portion is configured to sandwich the blade positioned at the inverted position, The work machine according to any one of claims 2 to 4, wherein the guide portion regulates the rotation of the blade so that the blade does not come into contact with the head portion as it moves from the initial position toward the inverted position.

6. A motor; a housing that accommodates the motor; a moving member that moves along a first direction by the driving force of the motor; a tool bit connected to the moving member; a guide mechanism connected to the housing, the guide mechanism including a guide portion that restricts rotation of the tool bit about an axis in the first direction and guides movement of the tool bit along the first direction, and an engaging portion that is engageable with a workpiece; Equipped with the guide mechanism and the moving member are configured to be capable of relative rotation about an axis in the first direction, and each of them is configured to be capable of rotation about an axis in the first direction relative to the housing, When the guide mechanism is rotated relative to the housing, the tool bit is biased by the guide mechanism that rotates relative to the moving member, causing the moving member to rotate relative to the housing about an axis in the first direction, A work machine in which the movable member is supported at an inner portion of a support portion provided on the housing so that it can move in a first direction and rotate around an axis defined by the first direction, and the guide mechanism is supported at an outer portion of the support portion so that it can rotate relative to the housing around an axis defined by the first direction.

7. the guide mechanism is coupled to the housing so as to be rotatable about an axis in the first direction, The work machine according to claim 6, wherein when the guide mechanism rotates, the guide mechanism rotates relative to the housing to change the orientation of the tool bit.

8. The housing accommodates an output shaft connected to the motor, and the moving member is screw-engaged with the output shaft. When the output shaft is rotated by the driving force of the motor, the moving member moves in the axial direction of the output shaft, The work machine according to claim 7, wherein when the guide mechanism rotates about an axis in the first direction, the guide mechanism and the tool bit rotate about an axis in the first direction.

9. the tip tool is a plate-shaped blade, The guide mechanism includes: a rotary shaft rotatably connected to the housing and arranged coaxially with the output shaft; a pair of guide members connected to the rotary shaft so as to be rotatable together with the rotary shaft and sandwiching the tool bit therebetween to limit rotation of the tool bit around the axis of the output shaft; The work machine according to claim 8, further comprising:

10. The rotating shaft is formed in a cylindrical shape, The work machine according to claim 9, wherein the moving member is movably supported on the rotary shaft.

11. The work machine according to any one of claims 6 to 10, wherein the housing is provided with a stopper that defines a rotation range of the guide mechanism.

12. A motor; a housing that accommodates the motor; a moving member that moves along a first direction by the driving force of the motor; a tool bit connected to the moving member; a guide mechanism including a guide portion that restricts rotation of the tool bit about an axis in the first direction and guides movement of the tool bit along the first direction, and an engaging portion that can engage with a workpiece, and the guide mechanism is rotatably connected to the housing; Equipped with a stopper that defines a rotation range of the guide mechanism is provided on the housing; The stopper is provided with a magnet configured to be able to abut against the guide mechanism, and the abutting state between the guide mechanism and the stopper is maintained by the magnetic force of the magnet.

13. a movement limiting member is provided between the housing and the guide mechanism, The work machine described in claim 6 or claim 12, wherein the movement limiting member limits the relative rotation of the guide mechanism with respect to the housing around an axis in the first direction when the motor is driven, and allows the relative rotation of the guide mechanism with respect to the housing around an axis in the first direction when an operating force equal to or greater than a predetermined value is applied to the guide mechanism by an operator.

14. The work machine according to claim 13, wherein the movement restricting member restricts the relative rotation of the guide mechanism with respect to the housing when the motor is driven by a frictional force generated between the housing and the guide mechanism.

15. the movement limiting member is provided so as to be movable integrally with the guide mechanism, The movement limiting member is formed with a locking portion, 15. The work machine according to claim 13 or 14, wherein the locking portion is directly or indirectly locked to the housing at an intermediate position within the rotation range of the guide mechanism, thereby restricting relative rotation of the guide mechanism with respect to the housing.

16. A motor; a housing that accommodates the motor; a screw portion that is rotated by the motor in a first rotation direction or a second rotation direction opposite to the first rotation direction, with the first direction as an axis; a moving member that is threadedly engaged with the threaded portion, that moves in one direction in the first direction as the threaded portion rotates in the first rotational direction, and that moves in the other direction in the first direction as the threaded portion rotates in the second rotational direction, and is thereby driven to reciprocate along the first direction by the driving force of the motor; a tool bit connected to the movable member and moving in the first direction integrally with the movable member; a guide portion that restricts the bit from rotating about an axis in the first direction when the rotational force of the motor is transmitted to the moving member and the moving member moves in the first direction, regardless of whether the threaded portion rotates in the first rotation direction or the second rotation direction; Equipped with A work machine configured such that even when the guide portion restricts the tip tool from rotating around the first direction as an axis and the motor can move the moving member via the screw portion, the tip tool can still rotate around the first direction as an axis when an operator applies a biasing force to the tip tool such that the tip tool rotates around the first direction as an axis.

17. A motor; a housing that accommodates the motor; a moving member that moves along a first direction by the driving force of the motor; a tool bit connected to the moving member; a guide portion that restricts the rotation of the tool bit about an axis in the first direction when a rotational force of the motor is transmitted thereto; an elastic member that suppresses relative rotation of the guide portion with respect to the housing about an axis in the first direction by using a biasing force; Equipped with The tool bit is configured to be able to rotate around the first direction as an axis when an operator applies a biasing force to the tool bit such that the tool bit rotates around the first direction as an axis, even when the tool bit is restricted from rotating around the first direction as an axis by the guide portion, Even when the relative rotation of the guide portion with respect to the housing about the first direction as an axis is suppressed by the biasing force of the elastic member, the operator can directly bias the guide portion to rotate the guide portion relative to the housing about the first direction as an axis, and the work machine is configured to be able to perform work using the tool tip in this state.

18. A work machine as described in claim 16 or claim 17, wherein the guide portion guides the movement of the tip tool along the first direction.

19. A motor; a housing that accommodates the motor; an output section rotated by the motor; a moving member that is threadably engaged with the output portion and moves as the output portion rotates; a blade supported by the movable member and reciprocating between an initial position and an inverted position as the movable member moves; an adjustment mechanism having a pair of plate members sandwiching the blade and supported by the housing so as to be rotatable about the movement direction of the moving member; Equipped with By rotating the adjustment mechanism, a rotational position of the blade around the movement direction can be adjusted, The working machine further comprises a stopper provided on the housing for restricting the rotation of the movable member within a predetermined angular range when the adjustment mechanism is rotatable by an operator.

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