Work machine

Abstract

This invention optimally reciprocates a cutting blade. In this motorized cutting machine 10, a control unit 100 detects an initial position and a reversing position on the basis of a detection signal from a lifter detection switch 68, and the rpms of the motor 50. Namely, the motor 50 is drive-controlled by means of the control unit 100 to allow the travel of a lifter 65 and a blade 72 to be halted in the initial position and the reversing position. As a result thereof, for example, without providing a switching mechanism or the like for switching between disconnected and connected states of the path transmitting the motor drive force to the lifter, the lifter 65 can be halted or reversed in the reversing position. Accordingly, the lifter 65 and the blade 72 can be made to travel optimally.

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 axially relative to the screw shaft, and 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] Here, in the above electric reciprocating tool, when the movable blade moves to the foremost position, the screw engagement between the shuttle screw and the screw shaft is released, and the power transmission to the shuttle screw is interrupted. Thereby, the movable blade (cutting blade) stops at the foremost position. On the other hand, when the motor is reversed after the movable blade moves to the foremost position, the screw shaft is displaced, and the shuttle screw and the screw shaft are screwed together again. Thereby, the power transmission of the motor to the shuttle screw is restored. Therefore, the movable blade moves from the foremost position to the rear side.

[0005] Thus, in the above electric reciprocating tool, it is necessary to provide a mechanism in the electric reciprocating tool that releases the screw engagement between the shuttle screw and the screw shaft at one end when the movable blade is at its foremost position and then re-engages the shuttle screw and the screw shaft. For this reason, the mechanism for reciprocating the movable blade back and forth becomes complicated, which may increase the number of parts or reduce the durability of the parts. Also, since the screw engagement is released once, if the screw engagement is not properly made, problems may occur.

[0006] In view of the above facts, an object of the present invention is to provide a working machine that can preferably reciprocate a cutting blade.

Means for Solving the Problems

[0007] One or more embodiments of the present invention include a housing, a motor housed in the housing, a screw portion that is rotationally driven by the motor, a moving member that operates in one direction of a first direction when power is transmitted from the screw portion that rotates forward and operates in the other direction of the first direction when power is transmitted from the screw portion that rotates backward, a control portion that controls the motor, a position detection portion that detects the position of the moving member, an operation portion that operates the motor when turned on, and a cutting blade having a plate shape extending in the first direction and a second direction orthogonal to the first direction, and configured to operate integrally with the moving member. A guide mechanism rotatably connected to the housing about the first direction, wherein the guide mechanism includes a connection portion connected to the housing and located on one side of the connection portion in the first direction, configured to be able to change the rotational position about the first direction with respect to the housing to a first position and a second position that is different from the first position and is capable of supporting the workpiece a support portion, a connecting portion connecting the connecting portion and the supporting portion, and a working machine that cuts a workpiece by the cutting blade and the support portion, wherein the moving member when the operator the support portion is rotates made to rotate the supporting portion through the connecting portion, configured to rotate about the first direction, and the position detection portion is configured to be able to detect the position of the moving member both when the support portion is in the first position and when it is in the second position, with the cutting blade in the initial position. the supporting portion is located on one side of the cutting blade in the first direction, and When viewed in a third direction orthogonal to both the first direction and the second direction, the support portion and the cutting blade do not overlap. When the operation unit is turned on with the cutting blade in the initial position, the control unit rotates the motor forward to move the cutting blade closer to the support portion, and stops or reverses the motor when at least a part of the support portion and the cutting blade overlap when viewed in the third direction with the operation unit turned on. It is a working machine configured as such.

[0008] One or more embodiments of the present invention are work machines in which the position detection unit is provided at at least one location in the circumferential direction about the first direction, and the position of the moving member can be detected by the one position detection unit both when the supporting portion is located at the first position and when it is located at the second position. One or more embodiments of the present invention are work machines in which a circular detected portion about the first direction is connected to the moving member, and the position detection unit is a switch capable of detecting the position of the moving member based on the pressing state from the detected portion.

[0009] One or more embodiments of the present invention are a recess capable of positioning a part of the workpiece is provided in the supporting portion, The control unit, when viewed in the third direction the It is a working machine configured to stop the motor or reverse the motor at a position where the concave portion and the cutting blade overlap.

[0010] One or more embodiments of the present invention are the When the control unit operates the moving member in one direction or the other direction, the threaded portion It is a working machine configured to stop the motor while maintaining the screwing with the moving member.

[0013] One or more embodiments of the present invention are such that the moving member reciprocates between the initial position and the reverse position by the driving force of the motor, and the position detection unit includes an initial position detection unit that detects the initial position of the moving member and a reverse position detection unit that detects the reverse position of the moving member. The initial position detection unit includes at least one of a switch or a sensor, and the reverse position detection unit includes a rotation counting unit that detects the number of rotations of the motor. The control unit detects the initial position of the moving member based on the detection result of the initial position detection unit, and the detection result of the initial position detection unit and the reverse position detection unit the number of rotations of the motor detected by It is a working machine that detects the reverse position of the moving member based on this.

[0014] One or more embodiments of the present invention are The moving member reciprocates between the initial position and the reverse position by the driving force of the motor. The position detection unit is configured to be able to detect the initial position of the moving member, and the control unit detects the initial position of the moving member based on the detection signal of the position detection unit, and based on the number of rotations of the motor from the initial position, the the working machine detects the reverse position.

[0015] In one or more embodiments of the present invention, the position detection unit is a switch that switches from off to on by being pressed by the moving member when moving on the return path side from the reverse position to the initial position of the moving member, and the control unit starts measuring the number of rotations of the motor starting from the point in time when the position detection unit switches from on to off. It is a working machine. One or more embodiments of the present invention are work machines in which the position detection unit is provided at one location within the operating range of the moving member.

[0016] In one or more embodiments of the present invention, the control unit drives and controls the motor so as to move the moving member to the return path side after a predetermined time has elapsed since detecting the reverse position of the moving member. It is a working machine.

[0017] In one or more embodiments of the present invention, when the control unit does not detect the initial position of the moving member at the start of operation of the operation unit, the control unit drives and controls the motor so as to move the moving member to the return path side. It is a working machine.

[0018] In one or more embodiments of the present invention, when the operation of the operation unit is released during the movement of the moving member from the initial position to the reverse position on the forward path side, the control unit moves the moving member to the return path side. It is a working machine that drives and controls the motor.

[0019] In one or more embodiments of the present invention, the position detection unit is provided on the side of the moving member. It is a working machine.

[0020] One or more embodiments of the present invention are a working machine having a first housing that houses the moving member, a second housing that houses the motor and the control unit, and a third housing that houses at least a part of the position detection unit.

[0021] One or more embodiments of the present invention are a working machine in which the third housing is supported by the first housing or the second housing.

Advantages of the Invention

[0022] According to the working machine having the above configuration, the cutting blade can be reciprocated suitably.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0024] Hereinafter, the electric cutting machine 10 as a working machine according to this 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. Further, the front-back direction corresponds to the first direction of the present invention, the up-down direction corresponds to the second direction of the present invention, and the left-right direction corresponds to the third direction of the present invention.

[0025] As shown in FIGS. 1 and 2, the electric cutting machine 10 is configured as an electric tool for performing cutting processing 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 (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.

[0026] (Regarding the housing 20) The housing 20 forms the outer shell of the electric cutter 10 and extends in the front-rear direction as a whole. The housing 20 includes a lifter housing 22 (first housing) that forms the front part of the housing 20 and a main body housing 24 (second housing) that forms 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 part of the main body housing 24 and the rear end part of the lifter housing 22 are connected via a spacer 26. The lifter housing 22 is made of resin.

[0027] The rear end part of the main body housing 24 is configured as a handle part 24A that an operator grips, and the handle part 24A extends in the vertical direction. A trigger 30 as an operation part is provided at the upper end part of the handle part 24A. The trigger 30 is configured to be pullable backward, and it becomes on state when pulled. Also, a trigger switch 31 is provided on the handle part 24A obliquely downward behind the trigger 30. And when the trigger 30 is pulled, the trigger switch 31 switches from off state to on state.

[0028] The trigger switch 31 is electrically connected to a control part 100 described later, and the control part 100 is accommodated in the lower end part of the main body housing 24. And when the trigger switch 31 is turned on, the trigger switch 31 outputs an on signal to the control part 100.

[0029] Also, a battery mounting part 24B is formed in the lower end part of the main body housing 24. A battery terminal 28 is provided in the battery mounting part 24B, and the battery terminal 28 is electrically connected to the control part 100 described later. A battery 32 is detachably mounted in the battery mounting part 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 part 100.

[0030] 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 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.

[0031] A support mechanism 40 for supporting the lifter 65 of the 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.

[0032] (Regarding the support mechanism 40) As shown in Figs. 2, 3(A), and 4(A), the support mechanism 40 includes a pair of left - right fixed plates 41, an outer guide 44 (an element grasped as a support member in a broad sense), and an inner guide 45 as a rotating shaft.

[0033] 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 at 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. Then, the fixed plate 41 is disposed inside the front end portion 23 of the lifter housing 22 in the left - right direction, and the upper end portion and the lower end portion of the fixed plate 41 are disposed adjacent to the inside in the left - right direction of the flange portion 23A of the lifter housing 22.

[0034] At the upper and lower ends of the pair of left and right fixed plates 41, sleeves 42 are respectively spanned. 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 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. The inner diameter of the insertion hole 23B is slightly smaller than the outer diameter of the sleeve 42, and the sleeve 42 is press-fitted into the insertion hole 23B.

[0035] 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 disposed between the curved portions 41A of the pair of fixed plates 41. And both left and right ends of the outer guide 44 are fastened and fixed to the curved portions 41A of the left and right fixed plates 41 by a pair of front and rear bolts BL2. In the state where the outer guide 44 is fixed to the fixed plate 41, the tip of the bolt BL2 protrudes inward in the radial direction of the outer guide 44. Also, in this state, the head of the bolt BL2 is disposed in a notch 23C formed in the lifter housing 22 (see FIG. 1).

[0036] 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. An O-ring 46 made of rubber is provided between the inner guide 45 and the lifter body 66. There is a slight gap between the inner guide 45 and the lifter body 66, and the lifter body 66 can move slightly relative to the inner guide 45 in the radial direction. However, when the relative movement occurs, the O-ring 46 is compressed to buffer the movement. That is, the lifter body 66 is movably supported in a direction (vertical and horizontal directions) intersecting the front-rear direction, which is the direction driven by the motor 50. And when it moves, the elastic body is elastically deformed (that is, the O-ring 46 is compressed and deformed).

[0037] As also shown in FIG. 3(B), a pair of upper and lower slits 45B for arranging the blade 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 vertical 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 the guide mechanism 80 described later.

[0038] (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 portion of the main body housing 24. The motor 50 includes a drive shaft 51 having an axial direction in the front-rear direction, a substantially cylindrical rotor 52 fixed to the drive shaft 51, and a substantially cylindrical stator 53 disposed radially outside the rotor 52. The rear end portion 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 portion 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 portion 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. The motor bearing 55 is a well-known ball bearing and is a bearing member including an inner ring, an outer ring, and balls provided therebetween.

[0039] (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.

[0040] The transmission gear 61 has a base portion 61A and a gear portion 61B. The base portion 61A 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 base portion 61A is set to be larger than the diameter of the rear portion of the base portion 61A. A recess 61C that is open to the front (concave rearward) is formed in the central portion on the front side of the base portion 61A. 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 the spacer 26. A gear portion 61B is attached to the outer peripheral portion of the front portion of the base portion 61A, and the gear portion 61B is meshed with the pinion gear 51A of the drive shaft 51. The front portion of the base portion 61A is press-fitted into the gear portion 61B that is annular. The gear portion 61B is a helical gear. The gear portion 61B is shaped such that when a load is applied to the blade 72, which will be described later during operation, a thrust force in the forward direction is applied to the transmission gear 61 (gear portion 61B) due to the meshing action with the pinion gear 51A. At least a part of the gear bearing 62 is in the same position as the motor bearing 55 in the front-rear direction. In other words, at least a part of the gear bearing 62 is in a position that overlaps the motor bearing 55 when viewed in the radial direction (vertical direction). The base portion 61A and the gear portion 61B may be configured as a single component (integral structure), but since they are configured as separate members, it is easy to create the above-described complex shape. The gear bearing 62 is a well-known ball bearing and is a bearing member including an inner ring, an outer ring, and balls provided therebetween. The outer ring of the gear bearing 62 is in contact with the spacer 26, and the inner ring is in contact with the transmission gear 61 (base portion 61A).

[0041] 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 on the front side of the transmission gear 61. The rear end portion of the drive shaft 63 is integrally rotatably fitted into the recess 61C 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 (integrally with the transmission gear 61). Note that the recess 61C has a key structure (for example, a structure having one or more flat portions), and the rear end portion of the drive shaft 63 has the same shape. Also, the recess 61C and the drive shaft 63 are fitted so as to be relatively movable in the front-rear direction, and are in a so-called "sliding fit" relationship. As a result, the transmission gear 61 is operable in the front-rear direction. That is, the transmission gear 61 is movably supported in a direction (front-rear direction) intersecting the direction (rotation direction centered on the front-rear direction, including the up-down, left-right directions) in which it is driven by the motor 50. When the transmission gear 61 moves in the front-rear direction, it may move integrally with the shaft bearing 64, or the transmission gear 61 may be configured to move relative to the shaft bearing 64. It is important to connect the transmission gear 61 (recess 61C) and the drive shaft 63 with a fit that allows relative movement in the front-rear direction, and it is not necessarily required to make the transmission gear 61 operable in the front-rear direction. The shaft bearing 64 is a well-known ball bearing and is a bearing member including an inner ring, an outer ring, and balls provided therebetween. A male screw 63A is formed on the outer peripheral portion of the drive shaft 63 except for the rear end portion. A flange portion 63B is provided at the rear portion of the drive shaft 63. The rear side of the flange portion 63B is in contact with the front side of the shaft bearing 64 (inner ring). The rear side of the shaft bearing 64 (outer ring) is in contact with and supported by a bearing support portion 22B formed in the lifter housing 22. Therefore, even if the drive shaft 63 attempts to move rearward, its movement is restricted by the bearing support portion 22B (lifter housing 22) via the shaft bearing 64.

[0042] 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. An internal 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 external thread 63A of the drive shaft 63 and the internal thread 67A of the lifter connecting portion 67 are screwed together. That is, the drive shaft 63 and the lifter 65 are threadedly engaged.

[0043] 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 a reverse position (the position shown in FIG. 5). Note that the rotation of the lifter 65 during the rotation of the drive shaft 63 is restricted by a guide mechanism 80 described later. The reverse position may be also referred to as a terminal position.

[0044] 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 from the lifter main body 66 and has the front-rear direction as the thickness direction.

[0045] 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.

[0046] An outer peripheral portion of a rear end side of the lifter body 66 is formed with a lifter flange 66A, and the lifter flange 66A is formed in a disc shape protruding radially outward of the lifter body 66. And at the inversion position of the lifter 65, the lifter flange 66A is disposed close to the rear side of the inner guide 45. Note that in the connection state between the lifter body 66 and the lifter connection portion 67, the front end of the lifter connection portion 67 is disposed adjacent to the rear side of the lifter flange 66A of the lifter body 66.

[0047] The lifter detection switch 68 is configured as a lever-type micro switch 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 in 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.

[0048] Also, a spherical ball 70 is provided above the lifter detection switch 68, and the ball 70 is disposed within a ball hole portion 22A formed at the lower end of the outer periphery of the lifter housing 22. The ball hole portion 22A penetrates in the vertical direction, and the diameter of the ball hole portion 22A increases downward. In the off state of the lifter detection switch 68, the outer peripheral surface of the ball 70 is in contact with the lever portion of the lifter detection switch 68 and the inner peripheral surface of the ball hole portion 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 within 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 portion 22A is a communication hole that communicates the interior of the lifter housing 22 with the interior of the switch cover 69.

[0049] 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), causing the ball 70 to displace 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. Also, 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.

[0050] (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 stepped portion 66C (see FIG. 4(A)) is formed at the front end portion of the lifter main body 66, and the vertical intermediate portion of the rear end portion of the blade 72 is locked by a pin P disposed on the stepped portion 66C. Thereby, the blade 72 is configured to be movable together with the lifter 65 between the initial position and the inverted position. Further, 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.

[0051] 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 shape that protrudes forward when viewed from the left-right direction.

[0052] 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 the blade 72 moving 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.

[0053] (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 the workpiece W may be fixed to a specific location (such as a wall or ceiling), but 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.

[0054] 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 of the guide plate 81 in the up-down direction. 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. Then, 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.

[0055] 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 opened to the rear side and the lower side in side view.

[0056] 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 of the holding mechanism 90 described later is restricted. 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 manual operation of an operator, 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.

[0057] And in the present 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. The configuration is such that it can be determined in two directions.

[0058] The connecting member 82 is formed in a substantially long plate shape that extends in the front-rear direction with the left-right direction as the plate thickness direction. And 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 plate 81 by bolts BL4.

[0059] The head plate 83 is formed in a plate shape with the left-right direction being the plate thickness direction. The head plate 83 is disposed in front of the guide plate 81 and outside 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 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 perform cutting of 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 a notch portion in the support portion of the present invention or an open portion in the support portion.

[0060] (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 due to 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.

[0061] 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.

[0062] 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.

[0063] 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 fixing portion 94A. Then, as shown in FIGS. 1 and 3(B), in 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, and the counterclockwise rotation of the guide mechanism 80 as viewed from the front side is restricted. Also, in 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, and interference between the guide plate 81 and the lower stopper 94 is avoided.

[0064] Further, 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, the clockwise rotation of the guide mechanism 80 is restricted, and the position of the guide mechanism 80 is determined to be the second position (see FIG. 6). In 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, and interference between the guide plate 81 and the upper stopper 94 is avoided. 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, and restricts the lifter 65 from excessively relatively moving 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.

[0065] (Regarding the control unit 100) As shown in FIG. 2, the control unit 100 is housed inside the lower end of the main body housing 24 and held by the main body housing 24. The trigger switch 31, the motor 50, and the 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.

[0066] Also, when the operation of the trigger 30 is released and the trigger switch 31 is switched from on to off while the motor 50 is being driven forward, the control unit 100 is configured to drive the motor 50 in reverse. Further, the control unit 100 includes 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 the 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. Further, 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 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 is in 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.

[0067] (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.

[0068] Figure 7 shows a flowchart of the electric cutting machine 10. As shown in this figure, in the operation of the electric cutting machine 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).

[0069] 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 disposed 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).

[0070] 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, the control unit 100 drives the motor 50 to rotate forward. Thereby, the lifter 65 and the blade 72 move toward 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).

[0071] 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).

[0072] 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 has switched 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 at which 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.

[0073] In step 6, the control unit 100 starts measuring the rotational speed of the motor 50. Specifically, the control unit 100 starts measuring (counting) the rotational speed of the motor 50 based on the signal from the rotational speed measurement unit 100A. After the process of step 6, the process proceeds to step 7 (S7).

[0074] 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).

[0075] In step 8, the control unit 100 determines whether the rotational speed of the motor 50 has reached a predetermined rotational speed or more. That is, the control unit 100 determines whether the lifter 65 has reached the inversion position. In step 8, when the rotational speed of the motor 50 has not reached a predetermined rotational speed or more (in the case of No in step 8), the process returns to step 7. In step 8, when the rotational speed of the motor 50 has reached a predetermined rotational speed or more (in the case of Yes in step 8), the process proceeds to step 9 (S9).

[0076] 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).

[0077] In step 10, the motor 50 is set to the standby state. That is, after the forward driving of the motor 50 is stopped, the control unit 100 does not perform 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 the forward driving of the motor 50 is stopped, the process proceeds to step 11 after a predetermined time has elapsed.

[0078] 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 inversion 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).

[0079] In step 12, the control unit 100 detects whether 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 the lifter 65 has reached the initial position. In step 12, if the lifter detection switch 68 is not 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 on (in the case of Yes in step 12), the process proceeds to step 13 (S3).

[0080] 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 overruns 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).

[0081] 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 cutter 10 is terminated.

[0082] Note that 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, at the start of the operation of the electric cutter 10, since the lifter 65 has not returned to the initial position, the process proceeds to step 11 to return the lifter 65 to the initial position.

[0083] 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 of the operator on the trigger 30 is released during the forward movement of the lifter 65. Therefore, the control unit 100 stops the forward drive of the motor 50, and after a predetermined time has elapsed, reversely drives the motor 50 to return the lifter 65 to the initial position.

[0084] The operation of the above electric cutter 10 will be described using the time chart shown in FIG. 8. As shown in this figure, at time T0 when the electric cutter 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 cutter 10 is in the non-operating state, the trigger switch 31 is off.

[0085] 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.

[0086] 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.

[0087] 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 of times. 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 of times, the control unit 100 resets the count of the rotational speed and returns it to zero.

[0088] 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.

[0089] 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.

[0090] Then, at time T7, the rotational speed of the motor 50 becomes zero, and the lifter 65 reaches the initial stop position.

[0091] 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 drive of the motor 50 by the control unit 100 is continued, and the lifter 65 is returned to the initial position.

[0092] 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 to finish the cutting process on the workpiece W by the blade 72. Then, by the control unit 100 driving the motor 50 in reverse, the lifter 65 can be moved from the reverse position to the initial position in the return path and the motor 50 can be stopped at the initial position.

[0093] Thus, according to the electric cutting machine 10 of the present 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 rotation 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 in a state where 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 is not disengaged. In other words, the motor 50 can be stopped while maintaining the screwing state between the drive shaft 63 and the lifter 65. Thereby, for example, without providing a switching mechanism or the like for switching the transmission path of the driving force of the motor with respect to the lifter to a cut-off state or a connected state as in the electric cutting machine described in the background art, the lifter 65 can be stopped or reversed at the reverse position. In other words, the control unit 100 is configured to stop the motor 50 even when the trigger 30 is maintained in the on state when a part of the blade 72 overlaps the head plate 83 when viewed from the left-right direction, that is, when the cutting of the workpiece W by the blade 72 is completed. Therefore, preferably, the lifter 65 and the blade 72 can be moved. In particular, the control unit 100 is configured to stop the motor 50 even when the trigger 30 is maintained in the on state (pulled state) in a state where the head recess 83A and the blade 72 overlap when viewed from the left-right direction. Thereby, even when a part of the workpiece W is located in the head recess 83A, the cutting operation can be preferably performed. When the blade 72 is located at the reverse position, the motor 50 may be maintained in the stopped state, or may be immediately reversed without being stopped.In addition, since the workpieces have various shapes ranging from thin ones to those with complex shapes, the timing of 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 inverted 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 the position of the lifter 65 can be easily detected compared to a configuration where the drive shaft 63 operates inside the lifter 65.

[0094] 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 inverted 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 inverted position of the lifter 65 can be accurately detected.

[0095] 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 factors such as the braking performance of the motor 50. 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.

[0096] On the other hand, 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.

[0097] 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.

[0098] 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 let the operator recognize that the blade 72 has reached the reverse position and the cutting process of the workpiece W by the blade 72 has ended.

[0099] 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 power cutter 10 can be continued.

[0100] 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 to 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.

[0101] Further, the electric cutting machine 10 has a guide mechanism 80 for guiding the forward and backward movement of the blade 72, and restricts the blade 72 from rotating about the front-back 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 front-back 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 covering 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-back 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-back 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.

[0102] In addition, in the feed screw mechanism 60, a lifter 65 is screwed onto a drive shaft 63 having the front-rear direction as the axial direction, and a blade 72 is fixed to the lifter 65. Further, the guide mechanism 80 has a guide plate 81 for guiding 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.

[0103] In addition, the lifter 65 is supported by the inner guide 45 so as to be reciprocally movable. That is, the inner guide 45 allows the lifter 65 to move in the front-rear direction while restricting the movement of the lifter 65 in the vertical and horizontal directions. By doing so, the accuracy regarding the reciprocating movement of the lifter 65 can be improved, and accurate cutting can be performed. Further, the lifter 65 is supported by the inner guide 45 at the front and by the male screw 63A (drive shaft 63) at the rear. Therefore, the lifter 65 is supported so as to be operable at two positions spaced apart in the front-rear direction, whereby the tilting of the lifter 65 can be suppressed. Therefore, the accuracy of cutting can be improved. Furthermore, by suppressing the tilting of the lifter 65, it is possible to suppress the occurrence of problems in the screw fitting with the drive shaft 63. 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 so as to be movable. 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. Further, as described above, the lifter body 66 is supported so as to be movable in a direction (vertical and horizontal directions) intersecting the front-rear direction which is the driving direction by the motor 50. In other words, a slight gap is provided in the radial direction between the lifter 65 (lifter body 66) and the lifter guide 45. Although there is a slight variation in dimensions during manufacturing, by providing a radial gap between the lifter 65 and the lifter guide 45, this variation can be suitably accommodated. That is, manufacturing becomes easier. However, if a gap is created between the lifter 65 and the lifter guide 45, there is a risk that the lifter 65 will rattle inside the lifter guide 45. In this embodiment, an O-ring 46 (elastic body) provided between the lifter 65 and the lifter guide 45 is configured to absorb the rattling movement.Furthermore, in the present embodiment, the transmission gear 61 is supported so as to be movable in a direction (front-rear direction) intersecting with the direction (the rotational direction centered on the front-rear direction, i.e., the up-down and left-right directions) in which it is driven by the motor 50. By doing so, it is possible to further cope with the variations in the component dimensions in manufacturing described above, and it becomes easier to perform manufacturing. That is, in the present invention, the component that receives the power of the motor 50 and transmits the power to the blade 72 is supported by the housing 20 (spacer 26, lifter housing 22) so as to be movable in a direction intersecting with the direction in which it is driven by the motor 50, so that a working machine that is easy to manufacture can be realized. By making manufacturing easier, it is also possible to reduce costs.

[0104] In addition, a pair of stoppers 94 are provided on the lifter housing 22, and when the guide plate 81 abuts against the abutting 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 rotational direction of the guide mechanism 80. Thereby, an operator can easily determine the position of the guide mechanism 80 and change the orientation of the blade 72.

[0105] In addition, the operating range of the guide mechanism 80 is defined by the pair of stoppers 94. Specifically, the rotational 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 displacement of the initial stop position of the lifter 65 before and after the operation of the guide mechanism 80.

[0106] Also, a wave washer 92 is provided between the lifter housing 22 and the guide plate 81. 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) equal to or greater than 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.

[0107] In the present embodiment, the control unit 100 detects the reverse position of the lifter 65 by measuring the rotational 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 in the same manner as 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.

[0108] Further, 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.

[0109] 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. Further, since the transmission gear 61 can be omitted, it can contribute to the miniaturization of the electric cutting machine 10.

[0110] Also, 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 points of the guide mechanism 80 for changing the direction of the blade 72 are set, three positioning points 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.

[0111] 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.

[0112] 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.

[0113] 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 forward.

[0114] On one hand, at the front end of the fixed plate 41, in front of the bolt BL2, a locking recess 41B as a locked portion is formed. The locking recess 41B is formed in a substantially arc shape that is open to the front when viewed from the left - right direction.

[0115] And in the first position or the second position of the guide mechanism 80, the locking projection 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 in a state where the guide mechanism 80 is arranged at an intermediate position between the first position and the second position, the locking projection 116 fits into the locking recess 41B, and the locking projection 116 and the locking recess 41B are engaged in the rotational direction (see FIG. 9(B)). Thereby, the locking projection 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 projection 116 may be directly locked to the housing 20.

[0116] In addition, in the present embodiment, when configuring the blade 72 to reciprocate in the front-rear direction by utilizing the screw fitting between the drive shaft 63 and the lifter 65, in the power transmission path, the male screw portion (drive shaft 63) is set as the drive side (motor 50 side), and the female screw portion (lifter 65) is set as the driven side (blade 72 side). If the female screw portion is configured as the drive side and the male screw portion as the driven side, the female screw portion will cover around the reciprocating male screw portion, making it difficult to support the male screw portion on the driven side or requiring a complicated mechanism for its realization. However, in the present embodiment, the lifter 65 on the driven side can be supported with a simple configuration. As a result, cost reduction can also be achieved.

[0117] Further, by providing a flange portion 63B on the drive shaft 63, the rearward movement of the drive shaft 63 is indirectly restricted by the lifter housing 22 (bearing support portion 22B). In other words, it is configured such that the rearward force transmitted to the drive shaft 63 is received by the shaft bearing 64 and the lifter housing 22. By doing so, even if a rearward reaction force is transmitted to the drive shaft 63 during cutting by the blade 72, it is possible to suppress the transmission of this reaction force to the transmission gear 61. As a result, the durability required for the transmission gear 61 and the gear bearing 62 can be reduced, so for example, inexpensive or small-sized ones can be adopted for these.

[0118] Also, in the present embodiment, when a load is applied to the blade 72 (when cutting a workpiece), the gear portion 61B of the transmission gear 61 is shaped such that a thrust force in the forward direction is applied to the transmission gear 61 (gear portion 61B) by the meshing action with the pinion gear 51A. By doing so, it is possible to suppress the transmission of a biasing force in the rearward direction to the gear bearing 62 via the transmission gear 61 during cutting. Conversely, if a thrust force in the rearward direction is applied to the transmission gear 61 when a load is applied to the blade 72, since the inner ring of the gear bearing 62 is in contact with the transmission gear 61 on the front side, a biasing force in the rearward direction is generated in the inner ring of the gear bearing 62 during loading. This biasing force acts such that the inner ring is displaced in the front-rear direction with respect to the position of the outer ring, leading to a reduction in the life of the gear bearing 62. In the case of the present embodiment, such a problem can be suppressed. That is, the durability required for the gear bearing 62 can be reduced, and as a result, the gear bearing 62 can be made low-cost or small-sized.

[0119] Also, at least a part of the gear bearing 62 is in the same position as the motor bearing 55 in the front-rear direction. In other words, at least a part of the gear bearing 62 is in a position that overlaps with the motor bearing 55 when viewed in the radial direction (vertical direction). As a result, the length in the front-rear direction can be shortened. Also, in the present embodiment, since the gear bearing 62 can be made small as described above, the center position of the motor bearing 55 and the center position of the gear bearing 62 in the direction (vertical direction) intersecting the front-rear direction can be brought closer. As a result, the axis of the drive shaft 63 or the lifter 65 extending in the front-rear direction can be brought closer to the drive shaft 51 extending in the front-rear direction in the direction (vertical direction) intersecting the front-rear direction. That is, the drive shaft 63 or the lifter 65 can be brought closer to the drive shaft 51 in the vertical direction. As a result, miniaturization in the vertical direction becomes possible.

[0120] Also, in the present embodiment, at the first position or the second position of the guide mechanism 80, the guide plate 81 abuts against the abutting portion 94B of the stopper 94 to restrict the rotation of the guide mechanism 80. However, a magnet may be embedded in the abutting portion 94B, and the guide plate 81 may be made of a steel plate so as to maintain the abutting state between the guide plate 81 and the stopper 94 by the magnetic force of the magnet. Thereby, the guide mechanism 80 can be satisfactorily held at the first position or the second position.

[0121] In the present embodiment, it is configured by combining a plurality of inventions described in each paragraph and each subsection, which are described in the above (operation and effect). However, it may be a working machine to which only one invention is applied. As described above, each feature described one by one has its own effect, that is, only one of the plurality of inventions described in the present embodiment may be adopted. In particular, in the present embodiment, a working machine with good workability is realized by applying both the invention of control and the invention of mechanical configuration, but only one of them may be used.

Explanation of Reference Numerals

[0122] 10... Electric cutting machine (working machine), 20... Housing, 30... Trigger (operation unit), 50... Motor, 65... Lifter (moving member), 68... Lifter detection switch (position detection unit), 72... Blade (cutting blade), 83... Head plate (support unit), 83A... Head recess (recess), 100... Control unit, W... Workpiece

Claims

1. A housing, a motor housed in the housing, a screw portion rotationally driven by the motor, a moving member that operates in one direction of a first direction when power is transmitted from the screw portion rotating forward and operates in the other direction of the first direction when power is transmitted from the screw portion rotating backward, a control unit that controls the motor, a position detection unit that detects the position of the moving member, an operation unit that operates the motor when turned on, a cutting blade having a plate shape extending in the first direction and a second direction orthogonal to the first direction, and configured to operate integrally with the moving member, a guide mechanism rotatably connected to the housing about the first direction, and comprising: The guide mechanism includes: a connection portion connected to the housing, a support portion located on one side of the first direction with respect to the connection portion and configured to be able to change the rotational position about the first direction with respect to the housing between a first position and a second position different from the first position, and capable of supporting a workpiece, a connecting portion connecting the connection portion and the support portion, a working machine for cutting a workpiece by the cutting blade and the support portion, The moving member is configured to rotate about the first direction when the rotation of the support portion is transmitted through the connecting portion when an operator rotates the support portion. The position detection unit is configured to be able to detect the position of the moving member both when the support portion is in the first position and when the support portion is in the second position. In a state where the cutting blade is in an initial position, the support portion is located on one side of the cutting blade in the first direction, and the support portion and the cutting blade do not overlap when viewed in a third direction orthogonal to both the first direction and the second direction. The control unit is configured to rotate the motor forward to move the cutting blade closer to the support portion when the operation unit is turned on in a state where the cutting blade is in the initial position, and to stop or reverse the motor in a state where at least a part of the support portion and the cutting blade overlap when viewed in the third direction while the operation unit is turned on. Working machine.

2. The position detection unit is provided at at least one location in the circumferential direction about the first direction, and the position of the moving member can be detected by the one position detection unit both when the support portion is located at the first position and when the support portion is located at the second position. The working machine according to claim 1.

3. A circular detected portion about the first direction is connected to the moving member, The position detection unit is a switch capable of detecting the position of the moving member based on the pressing state from the detected portion. The working machine according to claim 2.

4. A recess capable of positioning a part of the workpiece is provided in the support portion, The control unit is configured to stop the motor or reverse the motor at a position where the recess and the cutting blade overlap when viewed in the third direction. The working machine according to claim 1.

5. The control unit is configured to stop the motor while maintaining the screwing engagement between the screw portion and the moving member when the moving member is operated in one direction or the other direction. The working machine according to claim 1.

6. The moving member reciprocates between the initial position and the reverse position by the driving force of the motor, The position detection unit is An initial position detection unit that detects the initial position of the moving member, A reverse position detection unit that detects the reverse position of the moving member, And is configured to include The initial position detection unit includes at least one of a switch or a sensor, The reverse position detection unit includes a rotation speed measurement unit that detects the number of rotations of the motor, The control unit detects the initial position of the moving member based on the detection result of the initial position detection unit, and detects the reverse position of the moving member based on the detection result of the initial position detection unit and the number of rotations of the motor detected by the reverse position detection unit. The working machine according to claim 1.

7. The moving member reciprocates between the initial position and the reverse position by the driving force of the motor, The position detection unit is configured to be able to detect the initial position of the moving member, The control unit detects the initial position of the moving member based on the detection signal of the position detection unit, and detects the reverse position of the moving member based on the number of rotations of the motor from the initial position. The working machine according to claim 1.

8. The position detection unit is a switch that switches from off to on by being pressed by the moving member when the moving member moves toward the return path side from the inversion position to the initial position. The control unit starts measuring the rotational speed of the motor starting from the point in time when the position detection unit switches from on to off. The working machine according to claim 6.

9. The position detection unit is provided at one location within the operating range of the moving member. The working machine according to claim 6.

10. The control unit drives and controls the motor so as to move the moving member toward the return path side after a predetermined time has elapsed since detecting the inversion position of the moving member. The working machine according to claim 6 or claim 7.

11. When the control unit does not detect the initial position of the moving member at the start of operation of the operation unit, the control unit drives and controls the motor so as to move the moving member toward the return path side. The working machine according to claim 6 or claim 7.

12. When the operation of the operation unit is released during the movement of the moving member from the initial position to the inversion position toward the forward path side, the control unit drives and controls the motor so as to move the moving member toward the return path side. The working machine according to claim 6 or claim 7.

13. The position detection unit is provided at a lateral position of the moving member. The working machine according to claim 6 or claim 7.

14. The housing has a first housing that houses the moving member, a second housing that houses the motor and the control unit, and a third housing that houses at least a part of the position detection unit. The working machine according to claim 1.

15. The third housing is supported by the first housing or the second housing. The working machine according to claim 14.

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