Work machine

Abstract

In the electric cutting machine (10), the center of gravity (G1) of the electric cutting machine (10) is located at a position overlapping the blade (60) in the vertical direction of the electric cutting machine (10) in a side view. That is, in a side view, the center of gravity G1 of the electric cutting machine 10 is located within the width dimension B of the blade 60 in the vertical direction. Therefore, when the electric cut-off machine 10 is in the standing posture, the gravity center G1 of the electric cut-off machine 10 is located on the lower side of the blade 60 in the vertical direction, and the blade 60 is used for cutting off the material W to be machined. As a result, the workability of the electric cutting machine (10) can be improved.

Description

Technical Field

[0001] The invention relates to a working machine. Background Art

[0002] In the electric reciprocating tool (working machine) described in the following patent document 1, a support plate is provided at the front end of the electric reciprocating tool, and a blade holder is provided at the rear side of the support plate. In addition, a housing is provided at the rear side of the blade holder, and the housing is composed of a motor chamber extending in the front-back direction and a handle extending in a direction intersecting the motor chamber. Then, the workpiece is placed on the support plate, and by operating the main switch of the handle, the movable blade moves forward to perform cutting processing on the workpiece.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2001-277039 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, there is room for improvement in the electric reciprocating tool in the following aspects. That is, for example, when cutting a processed material such as a light steel keel fixed to a ceiling, etc., it is necessary to install the light steel keel located on the upper side of the operator in the vertical direction on the bracket plate of the electric reciprocating tool. Specifically, the length direction of the electric reciprocating tool is made consistent with the vertical direction, and the electric reciprocating tool is suspended from the light steel keel. In this case, if the posture of the electric reciprocating tool is inclined relative to the vertical direction, the processing of the cut surface of the light steel keel may be deteriorated. Therefore, in this case, it is necessary to correct the posture of the electric reciprocating tool in a manner along the vertical direction while performing the operation, and there is a possibility that the workability is reduced. In addition, when cutting a processed material such as a light steel keel fixed to a ceiling, etc., it is necessary to install the light steel keel located on the upper side of the electric reciprocating tool in the vertical direction on the bracket plate. At this time, in the electric reciprocating tool, the position of the handle is offset relative to the position where the light steel keel is installed, so the position of the light steel keel relative to the operator's hand is deviated, making it difficult to grasp the position of the bracket plate relative to the target cutting position. Therefore, the workability when installing the light steel keel on the bracket plate may be reduced. In addition, if the position of the handle is offset relative to the position where the light steel keel is installed, when working on the light steel keel located near the wall, the handle may hit the wall, and the workability may be reduced.

[0008] In view of the above-mentioned facts, an object of the present invention is to provide a working machine capable of improving workability.

[0009] Technical means of solving problems

[0010] One or more embodiments of the present invention are a working machine, comprising: a shell extending along a first direction; and a cutting tool, which is arranged on one side of the first direction of the shell to be able to reciprocate in the first direction, and is formed into a plate-like shape with a second direction orthogonal to the first direction as a width direction and a third direction orthogonal to the first direction and the second direction as a plate thickness direction, and the light steel keel is cut by moving to one side of the first direction. When viewed from the third direction, the center of gravity is located at a position overlapping with the cutting tool in the second direction.

[0011] One or more embodiments of the present invention provide a working machine, wherein the housing has a grip portion, and at least a portion of the grip portion is disposed at a position overlapping the center of gravity in the first direction.

[0012] One or more embodiments of the present invention provide a working machine, wherein the grip portion extends along the first direction.

[0013] One or more embodiments of the present invention are a working machine, wherein a support portion for supporting the light steel keel is provided on one side of the first direction relative to the cutting tool, and a V-shaped blade portion is formed at one end portion of the first direction of the cutting tool, protruding toward one side of the first direction when viewed from the third direction, and in the second direction, the front end portion of the blade portion is arranged at a position offset to one side of the second direction relative to the center portion of the second direction in the support portion, and the center of gravity is located at a position offset to the other side of the second direction relative to the center portion of the second direction in the support portion.

[0014] One or more embodiments of the present invention are a working machine, wherein the housing accommodates a motor for reciprocating the cutting tool, and the motor is arranged at a position offset to one side of the second direction relative to the center of the support portion in the second direction.

[0015] One or more embodiments of the present invention are a working machine, wherein a power supply unit for supplying power to the motor is provided in the housing, and the power supply unit is arranged at a position offset to the other side of the second direction relative to the center of the second direction in the support portion.

[0016] One or more embodiments of the present invention provide a working machine, wherein, when viewed from the third direction, a portion of the grip portion is located outside an imaginary circle centered on a center portion of the support portion in the second direction and passing through the center of gravity.

[0017] One or more embodiments of the present invention provide a working machine, wherein a portion of the grip portion is located at a position overlapping the support portion in the second direction when viewed from the third direction.

[0018] Effects of the Invention

[0019] According to one or more embodiments of the present invention, workability can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] [ Figure 1 ] is a side view of the electric cutting machine according to the first embodiment as viewed from the left side.

[0021] [ Figure 2 ] is to indicate Figure 1 The interior of the electric cut-off machine is shown in a partially broken side view as viewed from the left side.

[0022] [ Figure 3 ] is to Figure 1 The middle part of the grip portion in the front-to-back direction is enlarged and shown in a cross-sectional view as viewed from the rear side ( Figure 1 3-3 line cross section).

[0023] [ Figure 4 ] is a flowchart for explaining the operation of the electric cutting machine of the first embodiment.

[0024] [ Figure 5 ] is an explanatory diagram for explaining the inclination of an electric cutting machine in an upright position as a comparative example of the deviation of the center of gravity position.

[0025] [ Figure 6 ] is a side view showing the interior and center of gravity position of the electric cutting machine of the second embodiment as viewed from the left side.

[0026] [ Figure 7 ]yes Figure 6 A perspective view of the electric cutting machine shown.

[0027] [ Figure 8 ] (A) is a side view showing the interior and center of gravity position of the electric cutting machine of the third embodiment as viewed from the left side, and (B) is a schematic cross-sectional view of the connecting portion of the electric cutting machine of (A) as viewed from the front side. Figure 8 (A) 8B-8B line cross section).

[0028] [ Fig. 9 ]yes Figure 8 A perspective view of the electric cutting machine shown.

[0029] [ Fig.10] is a side view showing the interior and center of gravity position of the electric cutting machine of the fourth embodiment as viewed from the left side.

[0030] [ Fig.11 ]yes Fig.10 A perspective view of the electric cutting machine shown.

[0031] [ Fig.12 ] is a side view showing the interior and center of gravity position of the electric cutting machine of the fifth embodiment as viewed from the left side.

[0032] [ Fig.13 ]yes Fig.12 A perspective view of the electric cutting machine shown.

[0033] [ Fig.14 ](A) is a side view showing the electric cutting machine of the sixth embodiment as viewed from the left side, and (B) is a side view showing the interior of the electric cutting machine of (A) as viewed from the left side.

[0034] [ Fig.15 ](A) is a side view showing the electric cutting machine of the seventh embodiment as viewed from the left side, and (B) is a side view showing the interior of the electric cutting machine of (A) as viewed from the left side.

[0035] [ Fig.16 ](A) is a side view showing the electric cutting machine of the eighth embodiment as viewed from the left side, and (B) is a side view showing the interior of the electric cutting machine of (A) as viewed from the left side.

[0036] [ Fig.17 ](A) is a side view showing the electric cutting machine of the ninth embodiment as viewed from the left side, and (B) is a side view showing the interior of the electric cutting machine of (A) as viewed from the left side.

[0037] [ Fig.18 ](A) is a side view showing the electric cutting machine of the tenth embodiment as viewed from the left side, and (B) is a side view showing the interior of the electric cutting machine of (A) as viewed from the left side. DETAILED DESCRIPTION

[0038] (First Embodiment) Hereinafter, using Figure 1 to Figure 5The electric cutting machine 10 as a working machine of the first embodiment is described. In addition, the arrow UP, arrow FR, and arrow LH indicated appropriately in the drawings respectively indicate the upper side, the front side, and the left side of the electric cutting machine 10. Moreover, in the following description, when the up-down, front-back, and left-right directions are used for description, unless otherwise specified, the up-down direction, the front-back direction, and the left-right direction of the electric cutting machine 10 are indicated. In addition, 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.

[0039] like Figure 1 and Figure 2 As shown, the electric cutting machine 10 is configured as an electric tool for cutting a workpiece W as a light steel keel used in a suspended ceiling of a building. The workpiece W is formed into a long columnar shape, and when viewed from its length direction, it is formed into a roughly U-shaped shape. The light steel keel is made of metal, and of course, the cross-section (in a direction perpendicular to the length direction) is also roughly U-shaped. The electric cutting machine 10 is composed of a housing 20, a motor 40, a feed screw mechanism 50 (in a broad sense, an element grasped as a moving mechanism), a blade 60 as a cutting tool, a guide mechanism 70, and a controller 90. The following describes the various structures of the electric cutting machine 10.

[0040] (About the housing 20) The housing 20 constitutes the outer contour of the electric cutting machine 10 and extends in the front-to-back direction as a whole. The housing 20 is composed of a handle housing portion 20A constituting the front portion of the housing 20 and a motor housing portion 20B constituting the rear portion of the housing 20. The handle housing portion 20A is formed into a substantially rectangular cylindrical shape extending in the front-to-back direction. A pair of extension portions 20A1 extending to both sides in the upward and downward directions are formed at the front end portion of the handle housing portion 20A. A handle guard 20C as a protective portion is provided at the lower side of the handle housing portion 20A. The handle guard 20C is formed into a substantially rectangular cylindrical shape extending in the front-to-back direction. The front end portion of the handle guard 20C is bent upward and connected to the extension portion 20A1 on the lower side, and the rear end portion of the handle guard 20C is bent upward and obliquely backward and connected to the rear end portion of the handle housing portion 20A. Moreover, the portion between the front end portion and the rear end portion of the handle guard 20C in the handle housing portion 20A constitutes a grip portion 20A2 held by the operator. That is, the grip portion 20A2 extends in the front-to-back direction behind the extension portion 20A1. In addition, the left-right dimension of the front end portion of the handle housing portion 20A having a pair of extension portions 20A1 is set larger than the left-right dimension of the grip portion 20A2, and the front end portion of the handle housing portion 20A extends further outward in the left-right direction than the grip portion 20A2 (see FIG. Figure 3 ).

[0041] The motor housing portion 20B is formed into a substantially flat shape with the left-right direction as the thickness direction. The thickness dimension of the motor housing portion 20B is set to be larger than the thickness dimension (dimension in the left-right direction) of the handle housing portion 20A. The upper end portion of the motor housing portion 20B protrudes upward more than the handle housing portion 20A, and the lower end portion of the motor housing portion 20B is located above the handle guard 20C.

[0042] A trigger 30 as an operating unit for indicating the start of movement of the blade 60 (start of cutting processing) described later is provided at the front end of the grip 20A2. The trigger 30 protrudes downward from the grip 20A2 in a manner that can be pulled upward. A trigger switch 32 is provided at the front end of the handle housing 20A on the lower side of the trigger 30. And, by pulling the trigger 30, the trigger switch 32 is switched from off to on. In addition, by releasing the pulling operation of the trigger 30, the trigger switch 32 is switched from on to off.

[0043] The trigger switch 32 is electrically connected to a controller 90 described later, and the controller 90 is accommodated in the rear end portion of the motor housing portion 20B. Then, when the trigger switch 32 is turned on, the trigger switch 32 outputs an on signal to the controller 90.

[0044] In addition, at the lower end of the motor housing 20B, a battery mounting portion 20D as a battery mounting portion is provided on the rear side of the handle guard 20C. A battery terminal 22 as a power supply portion for supplying power to the motor 40 is provided in the battery mounting portion 20D, and the battery terminal 22 is electrically connected to the controller 90 described later. A battery 24 as a battery is installed in the battery mounting portion 20D in a detachable manner, and the battery 24 has a connector (not shown) connected to the battery terminal 22. Thus, it is configured to supply power to the motor 40 described later via the controller 90. In addition, the position of the lower end of the battery 24 in the up and down direction coincides with the position of the lower end of the handle guard 20C. In other words, the battery 24 is set not to protrude further downward than the handle guard 20C. In addition, the rear end of the motor housing 20B protrudes further to the rear side than the battery 24, and is curved in a substantially arc shape protruding to the rear side when viewed from the side.

[0045] A sub-trigger 34 (in a broad sense, an element grasped as a misoperation suppressing unit) for suppressing misoperation of the trigger 30 is provided at the upper end of the motor housing 20B. The sub-trigger 34 is configured to be able to slide toward the front side. In the upper end of the motor housing 20B, a sub-trigger switch 36 is provided at the lower side of the sub-trigger 34, and the sub-trigger switch 36 is electrically connected to the controller 90 described later. Then, by sliding the sub-trigger 34, the sub-trigger switch 36 is switched from off to on, and an on signal is output to the controller 90. In addition, by releasing the sliding operation of the sub-trigger 34, the sub-trigger 34 moves to the rear side, and the sub-trigger switch 36 is switched from on to off. In addition, in the electric cutting machine 10, it is configured that the trigger switch 32 is turned on after the sub-trigger switch 36 is turned on at the start of the cutting process, thereby allowing the forward rotation drive of the motor 40 described later. That is, the sub-trigger 34 is configured as an operating unit for suppressing misoperation of the trigger 30 at the start of the cutting process.

[0046] An inner guide member 38 is provided at the front end of the handle housing portion 20A. The inner guide member 38 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction. The rear portion of the inner guide member 38 is supported by the handle housing portion 20A, and the front portion of the inner guide member 38 protrudes forward from the handle housing portion 20A. A pair of upper and lower slits 38A for arranging a blade 60 described later are formed at the front portion of the inner guide member 38. The slit 38A extends in the front-rear direction and penetrates in the up-down direction, and the front end of the slit 38A is open to the front side.

[0047] (Regarding the motor 40) The motor 40 is configured as a brushless motor and is accommodated in the front part of the motor housing 20B. The motor 40 has a drive shaft 40A with the front-rear direction as the axial direction, and the rear end of the drive shaft 40A is rotatably supported by a motor bearing 42 held by the housing 20, and the front end side portion of the drive shaft 40A is rotatably supported by a motor bearing 44 held by the housing 20. A pinion 40B is formed at the front end of the drive shaft 40A. The motor 40 is electrically connected to the controller 90 and is driven by the control of the controller 90.

[0048] (About the feed screw mechanism 50) The feed screw mechanism 50 is composed of a transmission gear 51, a driving shaft 53 (broadly speaking, an element understood as an output shaft), an elevator 55 (broadly speaking, an element understood as a moving component), and an elevator detection switch 58 (broadly speaking, an element understood as an initial position detection unit) for detecting the initial position of the elevator 55.

[0049] The transmission gear 51 is formed in a substantially cylindrical shape with a height difference with the front-rear direction as the axial direction, and the diameter of the front portion of the transmission gear 51 is set larger than the diameter of the rear portion of the transmission gear 51. A gear recess 51A opened to the front side is formed in the central portion of the front surface of the transmission gear 51. The transmission gear 51 is arranged on the lower side of the front end portion of the drive shaft 40A of the motor 40, and the rear portion of the transmission gear 51 is rotatably supported by a gear bearing 52 held by the housing 20. A gear portion 51B is formed on the outer peripheral portion of the front portion of the transmission gear 51, and the gear portion 51B meshes with the pinion 40B of the drive shaft 40A.

[0050] The drive shaft 53 is formed into a roughly cylindrical shape with the front-rear direction as the axial direction. The drive shaft 53 is housed in the handle housing portion 20A, and is arranged on the front side of the transmission gear 51 and coaxially with the transmission gear 51. Moreover, the rear end portion of the drive shaft 53 is embedded in the gear recess 51A of the transmission gear 51 in a manner that allows it to rotate as a whole, and the rear end side portion of the drive shaft 53 is supported by a shaft bearing 54 held in the housing 20 so as to be rotatable. Thus, the drive shaft 53 is rotated by the drive motor 40. An external thread 53A is formed on the outer periphery of the drive shaft 53 except for the rear end portion.

[0051] The elevator 55 is formed as a whole in a generally long strip shape extending in the front-to-back direction. The elevator 55 is composed of an elevator body 56 and an elevator connecting portion 57 constituting the rear end portion of the elevator 55. The elevator connecting portion 57 is formed in a generally cylindrical shape with a height difference with the front-to-back direction as the axial direction. An internal thread 57A is formed on the inner circumference of the rear portion of the elevator connecting portion 57. Moreover, the front portion of the drive shaft 53 is inserted into the interior of the elevator connecting portion 57, and the external thread 53A of the drive shaft 53 is screwed with the internal thread 57A of the elevator connecting portion 57. That is, the drive shaft 53 and the elevator 55 are threadedly engaged.

[0052] Thus, the elevator 55 is configured to move in the front-rear direction by rotating the drive shaft 53. Specifically, the elevator 55 is in the initial position (at Figure 2 The position shown by the solid line in the middle) and the processing position (in Figure 2 In addition, the outer peripheral portion of the rear end portion of the elevator connecting portion 57 constitutes the detected portion 57B.

[0053] The elevator body 56 is formed in a generally bottomed cylindrical shape that is open to the rear side. The rear end of the elevator body 56 is embedded in the front part of the elevator connecting part 57, and the elevator connecting part 57 and the elevator body 56 are connected so as not to be relatively movable. In the initial position of the elevator 55, the front part of the drive shaft 53 is inserted into the interior of the elevator body 56 in a relatively movable manner. The front end of the elevator body 56 is supported by the inner guide member 38 provided at the front end of the handle housing part 20A so as to be relatively movable in the front-rear direction.

[0054] An elevator flange 56A is formed on the outer periphery of the rear end side portion of the elevator body 56. The elevator flange 56A is formed in a disc shape protruding radially outward from the elevator body 56. Although not shown in the figure, in the processing position of the elevator 55, the elevator flange 56A is arranged close to the rear side of the inner guide 38.

[0055] The elevator detection switch 58 is configured as a lever-type micro switch and is accommodated in the rear end portion of the handle protection member 20C. A spherical ball 59 is provided on the upper side of the elevator detection switch 58, and the ball 59 is arranged in a ball hole portion 20E formed on the lower end portion of the outer periphery of the handle housing portion 20A. The ball hole portion 20E penetrates in the up-down direction, and the diameter of the ball hole portion 20E increases toward the lower side. Moreover, in the disconnected state of the elevator detection switch 58, the outer peripheral surface of the ball 59 abuts against the lever portion of the elevator detection switch 58 and the inner peripheral surface of the ball hole portion 20E. In addition, in this state, a portion of the outer peripheral portion of the ball 59 protrudes radially inward relative to the inner peripheral surface of the handle housing portion 20A in a manner configured in the handle housing portion 20A.

[0056] Furthermore, when the lifter 55 is arranged at the initial position, the detected portion 57B of the lifter 55 presses the ball 59 radially outward (downward), and the ball 59 is displaced toward the lifter detection switch 58 side (downward). That is, when the lifter 55 reaches the initial position when moving toward the return path side from the processing position of the lifter 55 to the initial position, the ball 59 presses the lever portion of the lifter detection switch 58, and the lifter detection switch 58 is switched from off to on. The lifter detection switch 58 is electrically connected to the controller 90, and outputs a detection signal to the controller 90.

[0057] (About the blade 60) The blade 60 is formed in a plate shape extending up and down and forward and backward with the left-right direction as the plate thickness direction. The rear end of the blade 60 is fixed to the front end of the elevator 55 by a screw 61. Thus, the blade 60 is configured to be movable between the initial position and the processing position integrally with the elevator 55. In addition, the rear end of the blade 60 is inserted into the slit 38A of the inner guide 38. A blade portion 60A for cutting the workpiece W is formed at the front end of the blade 60, and the blade portion 60A is configured as a single blade and is formed in a substantially V-shaped shape protruding toward the front side when viewed from the left-right direction.

[0058] Moreover, in the initial position of the blade 60, the blade 60 is arranged adjacent to the front side of the housing 20 and arranged on the rear side of the workpiece W, and the blade 60 moves from the initial position to the front side, thereby performing a cutting process on the workpiece W. Furthermore, at the processing position of the blade 60, it is set that the cutting process on the workpiece W is completed.

[0059] (About the guide mechanism 70) The guide mechanism 70 includes a blade holder 72, a connecting member 76, and a head 80 as a processing portion. The head 80 functions as a member (supporting portion) that supports the processed material W. In addition, the processed material W as a light steel keel is sometimes fixed to a specific location (a wall or a ceiling, etc.), but in the present invention, the state in which the processed material W in such a fixed state is engaged with the head 80 is also set as a state in which the processed material W is supported by the head 80.

[0060] The blade holder 72 has a pair of left and right holder plates 74. The holder plates 74 are made of a metal plate and are formed into a substantially rectangular plate shape with the left and right direction being the plate thickness direction. A fixing portion 74A is formed in the middle portion of the holder plate 74 in the up-down direction, and the fixing portion 74A is formed into a substantially arc shape protruding outward in the left-right direction when viewed from the front side. Moreover, the fixing portion 74A is arranged on the radially outer side of the inner guide member 38, and is fastened and fixed to the inner guide member 38 by a pair of front and rear bolts BL1. Thus, the holder plate 74 is fixed to the inner guide member 38.

[0061] The pair of retainer plates 74 are arranged facing each other with a predetermined gap in the left-right direction. The facing distance of the lower parts of the pair of retainer plates 74 is set to be slightly longer than the plate thickness of the blade 60, and the blade 60 is arranged between the pair of retainer plates 74. Thus, when the drive shaft 53 rotates, the lifter 55 and the blade 60 are restricted from rotating together with the drive shaft 53 by the lower part of the blade retainer 72, and the reciprocating movement of the blade 60 in the front-back direction is guided by the blade retainer 72.

[0062] The connecting member 76 is made of a metal plate and is formed into a substantially long plate shape extending in the front-rear direction with the left-right direction as the plate thickness direction. The connecting member 76 is disposed between the upper ends of the pair of retainer plates 74 and is fastened to the retainer plates 74 by bolts BL2.

[0063] The head 80 has a pair of left and right top plates 82. The top plates 82 are made of a metal plate and are formed into a plate shape with the left and right direction being the plate thickness direction. The pair of top plates 82 are arranged on the front side of the retainer plate 74 and on the left and right outer sides of the connecting member 76, and the upper ends of the top plates 82 are fastened and fixed to the front end of the connecting member 76 by bolts BL2. Thus, the pair of top plates 82 are arranged facing each other with a predetermined interval in the left and right direction.

[0064] A support portion 80A for supporting the workpiece W is formed at the rear end of the head 80, and the support portion 80A is formed in a substantially comb-like shape with the vertical direction as the width direction and open to the rear side. That is, a plurality of (four in this embodiment) cutout portions 80A1 open to the rear side are formed through the support portion 80A, and the plurality of cutout portions 80A1 are arranged at predetermined intervals in the width direction of the support portion 80A. When the workpiece W is cut, the two ends of the workpiece W viewed from the length direction of the workpiece W are inserted into the cutout portions 80A1, and the workpiece W is placed (supported) on the head 80. In this way, a part of the workpiece W is located in the cutout portion 80A1 and supported by the head 80. In this embodiment, since the cutout portions 80A1 are provided at four locations, it is possible to handle the cutting of the workpiece W of a width corresponding to the combination of recesses.

[0065] In addition, when viewed from the side, the entire grip portion 20A2 of the housing 20 is arranged at a position that overlaps with the support portion 80A in the head 80 in the vertical direction (at the same position in the vertical direction). That is, when viewed from the left and right direction, the grip portion 20A2 is arranged at the width dimension A of the comb-shaped support portion 80A (see Figure 1 ) and extends in the front-to-back direction. In other words, when viewed from the front-to-back direction, the gripping portion 20A2 overlaps the support portion 80A, and the gripping portion 20A2 is arranged directly behind the support portion 80A (guide mechanism 70) (refer to Figure 3). Moreover, when the workpiece W is cut, the blade 60 moving toward the front side is inserted between a pair of top plates 82, and the workpiece W supported by the support portion 80A is cut. The width dimension A is the range from one end to the other end of the prescribed direction among the multiple cutout portions 80A1 arranged in the prescribed direction (up and down direction). In addition, the width dimension A of the support portion 80A is set to be slightly smaller than the width dimension B (the dimension in the up and down direction) of the blade 60, and when viewed from the left and right directions, the support portion 80A is arranged within the range of the width dimension B of the blade 60. Furthermore, when viewed from the side, the front end portion 60B of the cutting edge portion 60A of the blade 60 is arranged at a position offset upward relative to the center portion 80A2 in the up and down direction of the support portion 80A (refer to Figure 1 ).

[0066] In addition, a portion of the trigger 30 of the housing 20 is disposed at a position overlapping with the support portion 80A in the vertical direction (see FIG. Figure 3 ). That is, when viewed from the left and right direction, a portion of the trigger 30 is disposed within the range of the width dimension A of the support portion 80A and extends in the front-to-back direction. In other words, when viewed from the front-to-back direction, a portion of the trigger 30 overlaps with the support portion 80A (see Figure 3 ).

[0067] (Regarding the controller 90) Figure 2 As shown, the controller 90 is accommodated in the rear end portion of the motor housing portion 20B of the housing 20 and is held in the housing 20. The trigger switch 32, the auxiliary trigger switch 36, the motor 40, and the elevator detection switch 58 are electrically connected to the controller 90. The controller 90 detects the initial position of the elevator 55 based on the detection signal of the elevator detection switch 58. In addition, the controller 90 drives and controls the motor 40 based on the output signals from the trigger switch 32, the auxiliary trigger switch 36, and the elevator detection switch 58. Moreover, the controller 90 drives the motor 40 in the forward direction, and the elevator 55 (blade 60) moves to the front side. The controller 90 drives the motor 40 in the reverse direction, and the elevator 55 (blade 60) moves to the rear side.

[0068] In addition, when the controller 90 releases the operation of the trigger 30 and switches the trigger switch 32 from on to off during the forward drive of the motor 40, the motor 40 is driven in reverse. Furthermore, the controller 90 has a motor drive detection unit 90A that detects the rotation speed of the drive shaft 40A of the motor 40. The controller 90 detects how many times the motor 40 has rotated from the initial position based on the detection signal from the motor drive detection unit 90A. Thus, the controller 90 detects the processing position of the elevator 55 (blade 60) based on the rotation speed of the motor 40 starting from the initial position of the elevator 55. Furthermore, when the controller 90 detects the processing position of the elevator 55 (blade 60), it stops the drive of the motor 40.

[0069] (Regarding the position of the center of gravity of the electric cutting machine 10) Next, the position of the center of gravity G1 of the electric cutting machine 10 will be described. Figure 1 As shown, when viewed from the side, the center of gravity G1 of the electric cutting machine 10 is located within the range of the width dimension B of the blade 60. That is, the center of gravity G1 is located at a position overlapping with the blade 60 in the up-down direction. Specifically, when viewed from the side, the center of gravity G1 is located at a position further to the rear than the trigger 30 and overlaps with the lower end side portion in the approximately front-to-back center portion of the grip 20A2. That is, in the up-down direction, the center of gravity G1 is located at a position offset downward relative to the center portion 80A2 of the support portion 80A. In addition, as described above, when viewed from the side, the center of gravity G1 overlaps with the lower end side portion in the approximately front-to-back center portion of the grip 20A2, so the rear portion of the grip 20A2 is located outside the imaginary circle CR centered on the center portion 80A2 of the support 80A and passing through the center of gravity G1. Furthermore, as shown in FIG. Figure 3 As shown, the center of gravity G1 of the electric cutting machine 10 is located in the center of the electric cutting machine 10 in the left-right direction. That is, when viewed from the front-back direction, the center of gravity G1 overlaps with the blade 60 and the support portion 80A.

[0070] (Operation and Effect) Next, the operation of the electric cutting machine 10 will be described, and the operation and effect of the electric cutting machine 10 of the present embodiment will be described.

[0071] exist Figure 4 . As shown in the figure, in the operation of the electric cutting machine 10, in step 1 (S1), the controller 90 detects whether the auxiliary trigger switch 36 is turned on based on the output signal from the auxiliary trigger switch 36. That is, the controller 90 determines whether the auxiliary trigger switch 36 is operated. In step 1, if the auxiliary trigger switch 36 is not turned on (in the case of No in step 1), the process returns to step 1. In step 1, if the auxiliary trigger switch 36 is turned on (in the case of Yes in step 1), the process transfers to step 2 (S2).

[0072] In step 2, based on the output signal from the trigger switch 32, it is detected whether the trigger switch 32 is turned on. That is, when the auxiliary trigger switch 36 is turned on, the controller 90 determines whether the trigger 30 is operated. In step 2, when the trigger switch 32 is not turned on (in the case of no in step 2), the process returns to step 1. In step 2, when the trigger switch 32 is turned on (in the case of yes in step 2), the process transfers to step 3 (S3). In addition, after step 3, even if the auxiliary trigger switch 36 is switched from on to off, the operation of the electric cutting machine 10 continues.

[0073] In step 3, the controller 90 detects whether the elevator detection switch 58 is turned on based on the output signal from the elevator detection switch 58. That is, the controller 90 determines whether the elevator 55 is configured in the initial position. In step 3, when the elevator detection switch 58 is turned on (the case of yes in step 3), the process moves to step 4 (S4).

[0074] In step 4, the motor 40 is driven in forward rotation by the controller 90. That is, when the controller 90 detects the initial position of the elevator 55, the motor 40 is driven in forward rotation. As a result, the elevator 55 and the blade 60 move forward (toward the path side), and the blade 60 approaches the workpiece W. After the processing of step 4, the process proceeds to step 5 (S5).

[0075] In step 5, the controller 90 detects whether the on state of the trigger switch 32 continues based on the output signal from the trigger switch 32. That is, the controller 90 determines whether the operation of the trigger 30 continues. In step 5, if the on state of the trigger switch 32 continues (if yes in step 5), the process moves to step 6 (S6).

[0076] In step 6, the controller 90 detects whether the elevator detection switch 58 is switched from on to off based on the output signal from the elevator detection switch 58. In step 6, when the elevator detection switch 58 is switched to off (the case of yes in step 6), the process proceeds to step 7 (S7). That is, in the present embodiment, the position of the elevator 55 where the elevator detection switch 58 is switched from on to off is the starting point of the initial position of the elevator 55 moving to the path (hereinafter, the position of the elevator 55 is referred to as the initial starting position), and in step 6, the controller 90 detects the initial starting position of the elevator 55. On the other hand, in step 6, when the elevator detection switch 58 is not switched to off (the case of no in step 6), the process returns to step 5. That is, when the elevator 55 moving to the path at the initial position does not reach the initial starting position, the process returns to step 5.

[0077] In step 7, the controller 90 starts measuring the rotation speed of the motor 40. Specifically, based on the signal from the motor drive detection unit 90A, the controller 90 starts measuring (counting) the rotation speed of the motor 40. After the processing in step 7, the process proceeds to step 8 (S8).

[0078] In step 8, the controller 90 detects whether the on state of the trigger switch 32 continues based on the output signal from the trigger switch 32. That is, the controller 90 determines whether the operation of the trigger 30 continues. In step 8, if the on state of the trigger switch 32 continues (if yes in step 8), the process moves to step 9 (S9).

[0079] In step 9, the controller 90 determines whether the rotation speed of the motor 40 is higher than the specified rotation speed. That is, the controller 90 determines whether the elevator 55 has reached the processing position. In step 9, if the rotation speed of the motor 40 is not higher than the specified rotation speed (in the case of No in step 9), the process returns to step 8. In step 9, if the rotation speed of the motor 40 is higher than the specified rotation speed (in the case of Yes in step 9), the process transfers to step 10 (S10).

[0080] In step 10, the forward rotation drive of the motor 40 is stopped by the controller 90. After the processing of step 10, the process proceeds to step 11 (S11).

[0081] In step 11, the motor 40 is placed in a standby state. That is, after the forward drive of the motor 40 stops, the controller 90 does not control the drive of the motor 40, but places the motor 40 in a standby state. After the processing of step 11, the process proceeds to step 12 (S12). Specifically, after the forward drive of the motor 40 stops, the process proceeds to step 12 after a predetermined time has passed.

[0082] In step 12, whether the trigger switch 32 is turned on is detected based on the output signal from the trigger switch 32. In step 12, if the trigger switch 32 is not turned on (in the case of No in step 12), the process returns to step 12. In step 12, if the trigger switch 32 is turned on (in the case of Yes in step 12), the process transfers to step 13 (S13).

[0083] In step 13, the motor 40 is driven in reverse by the controller 90. As a result, the elevator 55 and the blade 60 move to the rear side (return path side) and away from the workpiece W. That is, the elevator 55 and the blade 60 are reversed at the processing position, and the return path movement of the elevator 55 and the blade 60 begins. After the processing of step 13, the process proceeds to step 14 (S14).

[0084] In step 14, the controller 90 detects whether the elevator detection switch 58 is turned on based on the output signal from the elevator detection switch 58. That is, the controller 90 determines whether the elevator 55 has reached the initial position. In step 14, if the elevator detection switch 58 is not turned on (in the case of No in step 14), the process returns to step 14. On the other hand, in step 14, if the elevator detection switch 58 is turned on (in the case of Yes in step 14), the process transfers to step 15 (S15).

[0085] In step 15, the reverse driving of the motor 40 by the controller 90 is stopped. Thus, the lifter 55 stops at the initial position. After the processing of step 15, the process proceeds to step 16 (S1).

[0086] In step 16, the controller 90 detects whether the trigger switch 32 is switched from on to off based on the output signal from the trigger switch 32. That is, the controller 90 detects whether the operation of the trigger 30 is released. In step 16, if the trigger switch 32 is not off (in the case of No in step 16), the process returns to step 16. On the other hand, in step 16, if the trigger switch 32 is off (in the case of Yes in step 16), the operation of the trigger 30 is released, and thus the operation of the electric cutting machine 10 is terminated.

[0087] In addition, in step 3, when the lift detection switch 58 is not turned on (No in step 3), the process proceeds to step 13. That is, in this case, when the electric cutting machine 10 starts to operate, the lift 55 is not reset to the initial position, so the process proceeds to step 13 to reset the lift 55 to the initial position.

[0088] In addition, in step 5 and step 8, if the on state of the trigger switch 32 does not continue (the case of No in step 5 and step 8), the process proceeds to step 17. In step 17, the forward drive of the motor 40 is stopped by the controller 90, and the process proceeds to step 18 after the forward drive of the motor 40 is stopped. In step 18, the motor 40 is put into a standby state similarly to step 11, and the process proceeds to step 13 after the motor 40 is put into the standby state. That is, this is a case where the operator's operation of the trigger 30 is released during the movement of the elevator 55 on the outward path. Therefore, the forward drive of the motor 40 is stopped by the controller 90, and the motor 40 is driven in the reverse direction after a predetermined time has passed, so that the elevator 55 returns to the initial position.

[0089] When the workpiece W, which is a light steel keel fixed to a ceiling or the like, is cut, the operator located at the vertical lower side of the workpiece W sets the electric cutter 10 to an upright position (a position in which the front-rear direction of the electric cutter 10 is aligned with the vertical direction so that the head 80 is at the vertical upper end of the electric cutter 10), and arranges the electric cutter 10 at the vertical lower side of the workpiece W. Then, the workpiece W is inserted between the blade holder 72 and the head 80, and arranged at the vertical lower side of the head 80. In this state, the workpiece W is inserted into the support portion 80A of the head 80, and is installed in the head 80. That is, the workpiece W is engaged with the support portion 80A of the head 80, and the electric cutter 10 is suspended from the workpiece W.

[0090] Here, in the electric cutter 10, when viewed from the side, the center of gravity G1 of the electric cutter 10 is located at a position overlapping with the blade 60 in the vertical direction of the electric cutter 10. That is, when viewed from the side, the center of gravity G1 of the electric cutter 10 is located within the range of the width dimension B of the blade 60 in the vertical direction. Therefore, in the standing posture of the electric cutter 10, the center of gravity G1 of the electric cutter 10 is located on the vertical lower side of the blade 60 for cutting the workpiece W. As a result, the operability of the electric cutter 10 can be improved.

[0091] That is, assuming that the center of gravity G1 of the electric cutter 10 is located outside the range of the width dimension B of the blade 60 in the vertical direction (hereinafter, the electric cutter is referred to as the electric cutter 10 of the comparative example), when in the upright position, the center of gravity G1 is located below the workpiece W in the vertical direction, so the electric cutter 10 of the comparative example tends to be tilted relative to the vertical direction. Figure 5 As shown by the double-dashed line, it is assumed that in the electric cutting machine 10 of the comparative example in which the center of gravity G1 is located at the handle guard 20C, the electric cutting machine 10 of the comparative example is tilted in such a way that the handle guard 20C is located vertically below the workpiece W. Therefore, the operator needs to apply a horizontal force F (refer to Figure 5 ), the posture of the electric cutting machine 10 of the comparative example is corrected to the standing posture shown by the solid line. Therefore, in the electric cutting machine 10 of the comparative example, the workability may be reduced.

[0092] In contrast, in the electric cutting machine 10 of the present embodiment, as described above, the center of gravity G1 is located within the range of the width dimension B of the blade 60 in the vertical direction. Therefore, during the cutting process in the upright position, the electric cutting machine 10 naturally becomes an upright state in the vertical direction. As a result, the inclination of the blade 60 relative to the workpiece W can be suppressed. As a result, there is no need to correct the posture as in the electric cutting machine 10 of the comparative example. Therefore, the electric cutting machine 10 of the present embodiment can improve the workability.

[0093] In addition, the gripping portion 20A2 of the housing 20 is arranged at a position overlapping with the center of gravity G1 in the front-to-back direction. In the present embodiment, when viewed from the side, the center of gravity G1 overlaps with the lower end side portion of the substantially central portion of the gripping portion 20A2 in the front-to-back direction. That is, in the present embodiment, the center of gravity G1 is located at a position overlapping with the gripping portion 20A2 in the front-to-back direction and the up-down direction. Therefore, the gripping portion 20A2 where the center of gravity G1 is located can be gripped to perform cutting processing. In addition, the burden on the operator for maintaining the electric cutting machine 10 in the upright position when the operator grips the gripping portion 20A2 to make the electric cutting machine 10 in the upright position can be reduced. As a result, the workpiece W can be easily inserted between the blade holder 72 and the head 80. As described above, the operability of the electric cutting machine 10 can be further improved.

[0094] In addition, the gripping portion 20A2 is arranged at a position overlapping with the center of gravity G1 in the front-to-back direction and extends in the front-to-back direction. Therefore, for example, when an operator holds the gripping portion 20A2 of the electric cutting machine 10 in a horizontal posture (a posture in which the front-to-back direction of the electric cutting machine 10 is aligned with the horizontal direction), the posture balance of the electric cutting machine 10 can be improved. As a result, for example, the portability of the electric cutting machine 10 in the horizontal posture can be improved.

[0095] In addition, the front end portion 60B of the blade portion 60A of the blade 60 is arranged at a position offset upward relative to the center portion 80A2 in the width direction of the support portion 80A, and the center of gravity G1 is offset downward relative to the center portion 80A2 in the width direction of the support portion 80A. As a result, it is easy to ensure the distance from the front end portion 60B or the screw 61 (the connection portion between the blade 60 and the elevator 55) that receives the reaction force to the center of gravity G1. By making the center of gravity position away from the position where the reaction force is generated, the electric cutting machine 10 can be suppressed from rotating when the reaction force is generated.

[0096] In addition, the rear portion of the gripping portion 20A2 is located outside the imaginary circle CR centered on the center portion 80A2 in the width direction of the support portion 80A and passing through the center of gravity G1. As a result, the operability of the electric cutting machine 10 can be further improved. That is, for example, when the workpiece W as a light steel keel is installed in the electric cutting machine 10 in an upright position, the workpiece W is installed to be hooked on the support portion 80A. At this time, sometimes a moment centered on the support portion 80A is generated and hooked due to the force F applied by the operator to the gripping portion 20A2. Therefore, by holding the gripping portion 20A2 farther away from the support portion 80A than the center of gravity G1, the operator can generate the moment with a relatively small force F and install the workpiece W to be hooked on the support portion 80A. Therefore, the operability of the electric cutting machine 10 can be further improved.

[0097] In addition, the motor 40 is accommodated in the motor housing portion 20B of the housing 20, and the motor 40 is arranged at a position offset upward relative to the center portion 80A2 in the width direction of the support portion 80A in the head 80. In detail, the housing 20 extends in the front-to-back direction, the grip portion 20A2 constitutes the front side portion of the housing 20, and the motor housing portion 20B constitutes the rear portion of the housing 20. As a result, the rear end portion of the feed screw mechanism 50 for reciprocating the blade 60 using the driving force of the motor 40 can be arranged and accommodated in the housing 20 in a manner that overlaps with the front end portion of the motor 40 in the front-to-back direction. Therefore, it can contribute to the miniaturization of the body of the electric cutting machine 10 in the front-to-back direction.

[0098] In addition, the motor housing portion 20B is provided with a battery mounting portion 20D for mounting the battery 24, and the battery mounting portion 20D is provided on the lower side of the motor 40. Furthermore, the battery mounting portion 20D is provided with a battery terminal 22 for supplying power to the motor 40. Thus, the battery 24 for supplying power to the motor 40 can be mounted on the housing 20 while suppressing the enlargement of the body of the electric cutting machine 10 in the front-rear direction.

[0099] In addition, when viewed from the side, the entire grip portion 20A2 is arranged at a position overlapping with the support portion 80A in the up-down direction. That is, the grip portion 20A2 is arranged at the rear side of the head 80, and when viewed from the front-back direction, the grip portion 20A2 overlaps with the support portion 80A. Therefore, when the electric cutting machine 10 is in an upright position, the grip portion 20A2 is arranged directly below the support portion 80A in the vertical direction. Thus, when the processed material W as a light steel keel fixed to the ceiling or the like is installed on the electric cutting machine 10, the position of the support portion 80A (head 80) can be easily grasped. As a result, the operator who holds the grip portion 20A2 can easily approach the head 80 toward the processed material W, and install the processed material W on the support portion 80A of the head 80. As described above, the operability of the electric cutting machine 10 can be effectively improved. In addition, the grip portion 20A2 is provided with a trigger 30, and a portion of the trigger 30 overlaps with the support portion 80A when viewed from the front-back direction. Thus, the operator can operate the trigger 30 with the hand gripping the grip portion 20A2 while maintaining the state where the operator's hand is arranged directly behind the support portion 80A. Therefore, the operability of the electric cutting machine 10 can be further improved.

[0100] In addition, the housing 20 has a handle guard 20C extending in the front-to-back direction, and the handle guard 20C is arranged on the lower side of the grip portion 20A2 and the front side of the battery mounting portion 20D. That is, in the front-to-back direction, the handle guard 20C is arranged at a position overlapping with the center of gravity G1. As a result, the placement state of the electric cutter 10 can be stabilized when the handle guard 20C is placed on the ground or the like in a horizontal position. As a result, for example, the storage state of the electric cutter 10 can be stabilized. In addition, it becomes easy to perform a cutting operation in a state where the electric cutter 10 is placed horizontally.

[0101] (Second Embodiment) Next, use Figure 6 and Figure 7 An electric cutting machine 200 as a working machine according to a second embodiment will be described. The electric cutting machine 200 according to the second embodiment is configured similarly to the electric cutting machine 10 according to the first embodiment except for the following aspects. Figure 6 and Figure 7 In the drawings, the same reference numerals are given to the members having the same configuration as the electric cutting machine 10 according to the first embodiment.

[0102] That is, in the second embodiment, the handle guard 20C is omitted in the housing 20. The dimension of the housing 20 in the front-to-back direction is set longer than that in the first embodiment. The housing 20 has: an elevator housing portion 20F constituting the front end portion of the housing 20, a motor housing portion 20B constituting the middle portion of the housing 20 in the front-to-back direction, and a rear housing portion 20G constituting the rear portion of the housing 20. The elevator housing portion 20F is formed into a substantially cylindrical shape extending in the front-to-back direction, and the feed screw mechanism 50 is accommodated in the elevator housing portion 20F. The motor 40 is accommodated in the motor housing portion 20B, and the motor 40 is arranged at a position offset downward relative to the drive shaft 53 of the feed screw mechanism 50. The controller 90 is accommodated in the rear housing portion 20G, and a battery mounting portion 20D is provided at the rear end portion of the rear housing portion 20G.

[0103] The grip portion 20A2 is disposed on the upper side of the elevator housing portion 20F and extends in the front-to-back direction. Specifically, when viewed from the side, the grip portion 20A2 extends in a direction slightly inclined toward the upper side as it approaches the front side, the front end portion of the grip portion 20A2 is bent downward and connected to the front end portion of the elevator housing portion 20F, and the rear end portion of the grip portion 20A2 is bent downward and connected to the motor housing portion 20B. A trigger 30 protruding downward is provided at the front end portion of the grip portion 20A2. In the second embodiment, the handle guard 20C is omitted in the housing 20, but the periphery of the trigger 30 is protected as a result of being surrounded by the elevator housing portion 20F and the grip portion 20A2.

[0104] Furthermore, in the second embodiment, the center of gravity G2 of the electric cutting machine 200 is also located at a position overlapping with the blade 60 and the support portion 80A in the vertical direction of the electric cutting machine 200 when viewed from the side. Specifically, when viewed from the side, the center of gravity G2 overlaps with the elevator housing portion 20F and is located within the range of the width dimension B of the blade 60 and the range of the width dimension A of the support portion 80A in the vertical direction. Therefore, in the standing posture of the electric cutting machine 200, the center of gravity G2 of the electric cutting machine 200 is located on the vertical lower side of the blade 60 for cutting the workpiece W. As a result, the operability of the electric cutting machine 200 can be improved, similarly to the first embodiment.

[0105] In the second embodiment, the gripping portion 20A2 of the housing 20 is also arranged at a position overlapping with the center of gravity G2 in the front-rear direction. Therefore, the cutting process can be performed by gripping the gripping portion 20A2 arranged at a position substantially consistent with the center of gravity G2 in the length direction of the electric cutting machine 200. Therefore, the operability of the electric cutting machine 200 can be further improved.

[0106] In the second embodiment, the grip 20A2 is also arranged at a position overlapping with the center of gravity in the front-rear direction and extends in the front-rear direction. Therefore, for example, when the operator holds the grip 20A2 of the electric cutting machine 200 in a horizontal position, the posture of the electric cutting machine 200 can be well balanced. Therefore, the portability of the electric cutting machine 200 in a horizontal position can be improved.

[0107] (Third Embodiment) Next, use Figure 8 and Fig. 9 An electric cutting machine 300 as a working machine according to a third embodiment will be described. Figure 8 (A) indicates Figure 2 and Figure 6 The same cross-section diagram, Figure 8 (B) Yes Figure 8 (A) is a schematic cross-sectional view taken along the line 8B-8B. The electric cutting machine 300 of the third embodiment is configured similarly to the electric cutting machine 10 of the first embodiment except for the following aspects. Figure 8 and Fig. 9 In the drawings, the same reference numerals are given to the members having the same configuration as the electric cutting machine 10 according to the first embodiment.

[0108] That is, in the third embodiment, similarly to the second embodiment, the handle guard 20C is omitted in the housing 20. The housing 20 has an elevator housing portion 20F which is the same as that in the second embodiment and a motor housing portion 20B which constitutes the rear end portion of the housing 20. The elevator housing portion 20F constitutes the front portion of the housing 20, and the feed screw mechanism 50 is accommodated in the elevator housing portion 20F. The motor 40 is accommodated in the motor housing portion 20B, and the motor 40 is arranged at a position offset upward relative to the driving shaft 53 of the feed screw mechanism 50. A battery mounting portion 20D is provided at the lower end portion of the motor housing portion 20B, and the battery 24 mounted on the battery mounting portion 20D is arranged on the lower side of the motor housing portion 20B.

[0109] The gripping portion 20A2 is disposed radially outward of the elevator housing portion 20F and extends in a direction perpendicular to the front-rear direction (in Fig. 9In the example shown, the gripping portion 20A2 is arranged on the lower side relative to the elevator housing portion 20F and extends in the left-right direction). The gripping portion 20A2 is connected to the elevator housing portion 20F by a connecting portion 302, and is configured to be rotatable in the circumferential direction of the elevator housing portion 20F. Specifically, the connecting portion 302 is provided on the radially outer side of the elevator housing portion 20F, and both ends of the gripping portion 20A2 in the longitudinal direction are bent toward the elevator housing portion 20F and connected to the connecting portion 302. Thus, the gripping portion 20A2 extends in a direction orthogonal to the front-rear direction on the radially outer side of the elevator housing portion 20F, and is connected in a manner that allows rotation in the circumferential direction of the elevator housing portion 20F. A trigger 30 is provided at one end of the gripping portion 20A2 in the longitudinal direction, and the trigger 30 protrudes upward from the gripping portion 20A2. Figure 8 As shown in (B), in the elevator housing portion 20F, two convex portions 20H and thinned portions 20J are respectively provided at positions 180 degrees apart as the rotational position. In addition, in the connecting portion 302, recesses 302H are provided on the inner surface at intervals of 90 degrees. Moreover, the rotational position of the gripping portion 20A2 is fixed by the engagement of the convex portion 20H with the recessed portion 302H. The convex portion 20H is a curved surface, and the portion supporting the convex portion 20H by the thinned portion 20J can be elastically deformed. Therefore, if a torque greater than a specified value is applied to the gripping portion 20A2, the convex portion 20H retreats radially inward and disengages from the recessed portion 302H. When the gripping portion 20A2 is directly rotated, the convex portion 20H engages with the recessed portion 302H at a position 90 degrees apart, and the rotational position of the gripping portion 20A2 is fixed. In addition, the gripping portion 20A2 is configured to be rotatable within a specified angle range (270 degrees) relative to the elevator housing portion 20F through a locking structure not shown in the figure. That is, the gripping portion 20A2 can select four rotation positions at intervals of 90 degrees. The torque to the gripping portion 20A2 required for changing the rotational position can be adjusted by the thinning amount of the thinning portion 20J. In this way, in the second embodiment, the position of the gripping portion 20A2 can be changed, which can improve workability.

[0110] Moreover, in the third embodiment, when viewed from the side, the center of gravity G3 of the electric cutting machine 300 is also located at a position overlapping with the blade 60 and the support portion 80A in the vertical direction of the electric cutting machine 200. Specifically, when viewed from the side, the center of gravity G3 overlaps with the elevator housing portion 20F and is located within the range of the width dimension B of the blade 60 and the range of the width dimension A of the support portion 80A in the vertical direction. Therefore, in the standing posture of the electric cutting machine 300, the center of gravity G3 of the electric cutting machine 300 is located on the vertical lower side of the blade 60 for cutting the workpiece W. Thus, as in the first embodiment, the operability of the electric cutting machine 300 can be improved. In addition, the center of gravity position relationship is configured so that it will not change even if the rotation position of the grip portion 20A2 is changed.

[0111] (Fourth Embodiment) Next, use Fig.10 and Fig.11 An electric cutting machine 400 as a working machine according to a fourth embodiment will be described. The electric cutting machine 400 according to the fourth embodiment is configured similarly to the electric cutting machine 10 according to the first embodiment except for the following aspects. Fig.10 and Fig.11 In the drawings, the same reference numerals are given to the members having the same configuration as the electric cutting machine 10 according to the first embodiment.

[0112] That is, in the fourth embodiment, similarly to the second embodiment, the handle guard 20C is omitted in the housing 20. The housing 20 has an elevator housing portion 20F which is the same as that in the second embodiment, and a motor housing portion 20B which constitutes the rear end portion of the housing 20. The elevator housing portion 20F constitutes the front portion of the housing 20, and the feed screw mechanism 50 is accommodated in the elevator housing portion 20F. The motor 40 is accommodated in the motor housing portion 20B, and the motor 40 is arranged at a position offset downward relative to the drive shaft 53 of the feed screw mechanism 50, similarly to the second embodiment. A battery mounting portion 20D is provided at the upper end portion of the motor housing portion 20B, and the battery 24 mounted on the battery mounting portion 20D is arranged on the upper side of the motor housing portion 20B.

[0113] The grip 20A2 extends in the up-down direction and extends downward from the front end side portion of the elevator housing portion 20F. That is, the grip 20A2 extends from the front end side portion of the elevator housing portion 20F to the radially outer side of the elevator housing portion 20F. The battery 24 is not arranged on the rear side of the grip 20A2, and the grip 20A2 extends to the opposite side of the protruding direction of the battery 24 relative to the housing 20. A trigger 30 protruding toward the front side is provided at the upper end portion of the grip 20A2.

[0114] Furthermore, in the fourth embodiment, the center of gravity G4 of the electric cutting machine 400 is also located at a position overlapping with the blade 60 and the support portion 80A in the vertical direction of the electric cutting machine 400 when viewed from the side. Specifically, when viewed from the side, the center of gravity G4 overlaps with the elevator housing portion 20F and is located within the range of the width dimension B of the blade 60 and the range of the width dimension A of the support portion 80A in the vertical direction. Therefore, in the standing posture of the electric cutting machine 400, the center of gravity G4 of the electric cutting machine 400 is located on the vertical lower side of the blade 60 for cutting the workpiece W. As a result, the operability of the electric cutting machine 400 can be improved, similarly to the first embodiment.

[0115] In the fourth embodiment, the gripping portion 20A2 of the housing 20 is also arranged at a position overlapping with the center of gravity G4 in the front-rear direction. Therefore, the cutting process can be performed by gripping the gripping portion 20A2 arranged at a position substantially consistent with the center of gravity G4 in the length direction of the electric cutting machine 400. Therefore, the operability of the electric cutting machine 400 can be further improved.

[0116] (Fifth Embodiment) Next, use Fig.12 and Fig.13 An electric cutting machine 500 as a working machine according to a fifth embodiment will be described. The electric cutting machine 500 according to the fifth embodiment is configured similarly to the electric cutting machine 10 according to the first embodiment except for the following aspects. Fig.12 and Fig.13 In the drawings, the same reference numerals are given to the members having the same configuration as the electric cutting machine 10 according to the first embodiment.

[0117] That is, in the fifth embodiment, similarly to the second embodiment, the handle guard 20C is omitted in the housing 20. In the fifth embodiment, the dimension of the housing 20 in the front-to-rear direction is set shorter than that in the first embodiment. The housing 20 has an elevator housing portion 20F which is the same as that in the second embodiment and a motor housing portion 20B which is arranged on the lower side of the elevator housing portion 20F. The elevator housing portion 20F accommodates the feed screw mechanism 50. The motor 40 and the controller 90 are accommodated in the motor housing portion 20B, and the motor 40 is arranged parallel to the lower side of the feed screw mechanism 50. The controller 90 is arranged on the front side of the motor 40. A battery mounting portion 20D is provided on the upper side of the rear end portion of the elevator housing portion 20F, and the battery 24 mounted on the battery mounting portion 20D is arranged on the upper side of the motor housing portion 20B.

[0118] The grip portion 20A2 extends in the front-to-back direction and is disposed on the upper side of the elevator housing portion 20F and in front of the battery 24. Specifically, when viewed from the side, the grip portion 20A2 extends in a direction that is inclined upward as it approaches the front side. Moreover, the front end portion of the grip portion 20A2 is bent in a downward oblique direction and connected to the front end portion of the elevator housing portion 20F, and the rear end portion of the grip portion 20A2 is bent downward and connected to the middle portion of the elevator housing portion 20F in the front-to-back direction. A trigger 30 that protrudes downward is provided at the front end portion of the grip portion 20A2.

[0119] Moreover, in the fifth embodiment, the center of gravity G5 of the electric cutting machine 500 is also located at a position overlapping with the blade 60 and the support portion 80A in the vertical direction of the electric cutting machine 500 when viewed from the side. Specifically, when viewed from the side, the center of gravity G5 overlaps with the elevator housing portion 20F and is located within the range of the width dimension B of the blade 60 and the range of the width dimension A of the support portion 80A in the vertical direction. Therefore, in the standing posture of the electric cutting machine 500, the center of gravity G5 of the electric cutting machine 500 is located on the vertical lower side of the blade 60 for cutting the workpiece W. As a result, the operability of the electric cutting machine 500 can be improved as in the first embodiment.

[0120] In addition, in the fifth embodiment, the gripping portion 20A2 of the housing 20 is also arranged at a position overlapping with the center of gravity G5 in the front-rear direction. Therefore, the cutting process can be performed by gripping the gripping portion 20A2 arranged at a position substantially consistent with the center of gravity G5 in the length direction of the electric cutting machine 500. Therefore, the operability of the electric cutting machine 500 can be further improved.

[0121] In the fifth embodiment, the motor housing 20B is disposed below the elevator housing 20F, and the grip 20A2 and the battery 24 are disposed above the elevator housing 20F, and are arranged side by side in the front-to-back direction. Therefore, the electric cutting machine 500 can be miniaturized in the front-to-back direction.

[0122] (Sixth Embodiment) Next, use Fig.14 (A) and (B) describe an electric cutting machine 600 as a working machine according to the sixth embodiment. The electric cutting machine 600 according to the sixth embodiment is configured similarly to the electric cutting machine 10 according to the first embodiment except for the following aspects. Fig.14 In (A) and (B), the same reference numerals are given to components having the same configuration as the electric cutting machine 10 according to the first embodiment.

[0123] That is, in the sixth embodiment, the handle guard 20C is omitted in the housing 20. The dimension of the housing 20 in the front-to-back direction is set longer than that in the first embodiment. The housing 20 has: an elevator housing portion 20F constituting the front end portion of the housing 20, a motor housing portion 20B constituting the middle portion of the housing 20 in the front-to-back direction, and a handle housing portion 20A constituting the rear portion of the housing 20. The elevator housing portion 20F is formed into a substantially cylindrical shape extending in the front-to-back direction, and the feed screw mechanism 50 is accommodated in the elevator housing portion 20F. The motor 40 is accommodated in the motor housing portion 20B, and the lower portion of the motor housing portion 20B protrudes further downward than the elevator housing portion 20F.

[0124] The grip portion 20A2 constitutes the front portion of the handle housing portion 20A and extends in the front-to-back direction. The lower portion of the rear end portion of the handle housing portion 20A protrudes further downward than the handle housing portion 20A, and the battery mounting portion 20D is provided at the rear end portion of the handle housing portion 20A. Moreover, the battery 24 mounted on the battery mounting portion 20D constitutes the rear end portion of the electric cutting machine 200. In addition, the controller 90 is accommodated at the rear end portion of the handle housing portion 20A. A trigger 30 is provided at the front end portion of the grip portion 20A2, and the trigger 30 protrudes downward from the front end portion of the grip portion 20A2. That is, in the electric cutting machine 600 of the sixth embodiment, the housing 20 protrudes further to the rear side than the first embodiment, and the grip portion 20A2 is arranged on the rear side of the motor 40.

[0125] Furthermore, in the sixth embodiment, the center of gravity G6 of the electric cutting machine 600 is also located at a position overlapping with the blade 60 and the support portion 80A in the vertical direction of the electric cutting machine 600 when viewed from the side. Specifically, when viewed from the side, the center of gravity G6 overlaps with the elevator housing portion 20F and is located within the range of the width dimension B of the blade 60 and the range of the width dimension A of the support portion 80A in the vertical direction. Therefore, in the standing posture of the electric cutting machine 200, the center of gravity G6 of the electric cutting machine 200 is located on the vertical lower side of the blade 60 for cutting the workpiece W. Thus, as in the first embodiment, the operability of the electric cutting machine 600 can be improved.

[0126] Furthermore, in the sixth embodiment, the grip 20A2 held by the operator is also arranged at the rear side of the head 80, and overlaps with the support portion 80A of the head 80 when viewed from the front-back direction. Specifically, when viewed from the left-right direction, the grip 20A2 is arranged within the range of the width dimension A of the support portion 80A, and extends in the front-back direction. In other words, when viewed from the left-right direction, the grip 20A2 is located at the same position as the support portion 80A in the up-down direction. Therefore, similarly to the first embodiment, when the processed material W as a light steel keel fixed to the ceiling, etc. is installed on the electric cutting machine 600, the grip 20A2 is arranged on the lower side of the support portion 80A in the vertical direction. As a result, the processed material W can be easily installed on the support portion 80A of the head 80. As described above, the operability of the electric cutting machine 600 can be improved.

[0127] In the sixth embodiment, the trigger 30 is also provided at the front end of the grip 20A2, and a portion of the trigger 30 overlaps with the support 80A when viewed from the front-back direction. Specifically, a portion of the trigger 30 is arranged within the range of the width dimension A of the support 80A when viewed from the left-right direction. Thus, as in the first embodiment, the trigger 30 can be operated by the hand holding the grip 20A2 while the operator's hand is arranged at the rear side of the support 80A. Therefore, the operability of the electric cutting machine 600 can be further improved.

[0128] In addition, in the sixth embodiment, the housing 20 extends in the front-to-back direction, and the motor housing portion 20B, the grip portion 20A2, and the battery mounting portion 20D are arranged in a row in the front-to-back direction. In addition, the grip portion 20A2 is arranged at the rear portion of the housing 20 (further to the rear than the central portion in the front-to-back direction). Therefore, the grip portion 20A2 can be set at the rear end side of the electric cutting machine 600 while the body of the electric cutting machine 600 is extended in the front-to-back direction. Thus, when the processed material W as a light steel keel fixed to the ceiling, etc. is installed on the electric cutting machine 10, the grip portion 20A2 can be located at the lower side in the vertical direction compared to the first embodiment. As a result, the lifting amount of the electric cutting machine 600 by the operator can be reduced. Therefore, the operability of the electric cutting machine 600 can be further improved.

[0129] (Seventh Embodiment) Next, use Fig.15 (A) and (B) describe an electric cutting machine 700 as a working machine of the seventh embodiment. The electric cutting machine 700 of the seventh embodiment is configured similarly to the electric cutting machine 10 of the first embodiment except for the following aspects. Fig.15 In (A) and (B), the same reference numerals are given to components having the same configuration as the electric cutting machine 10 according to the first embodiment.

[0130] That is, in the seventh embodiment, similarly to the sixth embodiment, the handle guard 20C is omitted from the housing 20, and the dimension of the housing 20 in the front-to-back direction is set longer than that in the first embodiment. The housing 20 has: the same elevator housing portion 20F as in the sixth embodiment, the grip portion 20A2 constituting the middle portion of the housing 20 in the front-to-back direction, and the motor housing portion 20B constituting the rear end portion of the housing 20. The elevator housing portion 20F constitutes the front end portion of the housing 20, and the feed screw mechanism 50 is accommodated in the elevator housing portion 20F. The motor 40 is accommodated in the motor housing portion 20B. The battery mounting portion 20D is provided at the rear end portion of the motor housing portion 20B, and the battery 24 mounted on the battery mounting portion 20D constitutes the rear end portion of the electric cutting machine 700. Therefore, in the seventh embodiment, the elevator housing portion 20F, the grip portion 20A2, the motor housing portion 20B, and the battery mounting portion 20D are arranged in the front-to-back direction.

[0131] Moreover, in the seventh embodiment, the center of gravity G7 of the electric cutting machine 700 is also located at a position overlapping with the blade 60 and the support portion 80A in the vertical direction of the electric cutting machine 700 when viewed from the side. Specifically, when viewed from the side, the center of gravity G7 overlaps with the elevator housing portion 20F and is located within the range of the width dimension B of the blade 60 and the range of the width dimension A of the support portion 80A in the vertical direction. Therefore, in the standing posture of the electric cutting machine 700, the center of gravity G7 of the electric cutting machine 700 is located on the vertical lower side of the blade 60 for cutting the workpiece W. As a result, the operability of the electric cutting machine 700 can be improved as in the first embodiment.

[0132] Furthermore, in the seventh embodiment, the grip 20A2 held by the operator is also arranged at the rear side of the head 80, and overlaps with the support portion 80A of the head 80 when viewed from the front-back direction. Specifically, when viewed from the left-right direction, the substantially entirety of the grip 20A2 is arranged within the range of the width dimension A of the support portion 80A, and extends in the front-back direction. In other words, when viewed from the left-right direction, the substantially entirety of the grip 20A2 is located at the same position as the support portion 80A in the up-down direction. Therefore, similarly to the first embodiment, when the processed material W as a light steel keel fixed to the ceiling or the like is installed on the electric cutting machine 700, the grip 20A2 is arranged on the lower side of the support portion 80A in the vertical direction. As a result, the processed material W can be easily installed on the support portion 80A of the head 80. As described above, the operability of the electric cutting machine 700 can be improved.

[0133] In the seventh embodiment, the trigger 30 is also provided at the front end of the grip 20A2, and a portion of the trigger 30 overlaps with the support 80A when viewed from the front-back direction. Specifically, a portion of the trigger 30 is arranged within the range of the width dimension A of the support 80A when viewed from the left-right direction. Thus, as in the first embodiment, the trigger 30 can be operated by the hand holding the grip 20A2 while the operator's hand is arranged at the rear side of the support 80A. Therefore, the operability of the electric cutting machine 700 can be further improved.

[0134] In addition, in the seventh embodiment, the housing 20 extends in the front-to-back direction, and the elevator housing portion 20F, the grip portion 20A2, the motor housing portion 20B, and the battery mounting portion 20D are arranged in a row in the front-to-back direction. In addition, the grip portion 20A2 is arranged at the rear portion of the housing 20 (further to the rear than the central portion in the front-to-back direction). Therefore, similarly to the sixth embodiment, the grip portion 20A2 can be set at the rear end side of the electric cutting machine 700 while the body of the electric cutting machine 700 is extended in the front-to-back direction. Thus, when the processed material W as a light steel keel fixed to the ceiling, etc. is installed in the electric cutting machine 700, the grip portion 20A2 can be located at the lower side in the vertical direction compared to the first embodiment. As a result, the lifting amount of the electric cutting machine 700 by the operator can be reduced. Therefore, the operability of the electric cutting machine 700 can be further improved.

[0135] (Eighth Embodiment) Next, use Fig.16 (A) and (B) describe an electric cutting machine 800 as a working machine according to an eighth embodiment. The electric cutting machine 800 according to the eighth embodiment is configured similarly to the electric cutting machine 10 according to the first embodiment except for the following aspects. Fig.16 In (A) and (B), the same reference numerals are given to components having the same configuration as the electric cutting machine 10 according to the first embodiment.

[0136] That is, in the eighth embodiment, the housing 20 has: the same elevator housing portion 20F as in the sixth and seventh embodiments, the motor housing portion 20B constituting the middle portion of the housing 20 in the front-rear direction, and the handle housing portion 20A constituting the rear end portion of the housing 20. The elevator housing portion 20F constitutes the front end portion of the housing 20, and the feed screw mechanism 50 is accommodated in the elevator housing portion 20F. The motor housing portion 20B protrudes downward from the rear end portion of the elevator housing portion 20F, and the motor 40 is accommodated in the motor housing portion 20B. In addition, a battery mounting portion 20D is provided at the rear end portion of the elevator housing portion 20F. The battery mounting portion 20D protrudes upward from the elevator housing portion 20F, and the battery 24 mounted on the battery mounting portion 20D protrudes further upward than the battery mounting portion 20D. When viewed from the left side, the handle housing portion 20A extends in a direction that is inclined downward as it moves toward the rear side. The handle guard 20C extends rearward from the lower end of the motor housing 20B, and the rear end of the handle guard 20C is connected to the lower end of the handle housing 20A. The controller 90 is accommodated at the front end of the handle housing 20A.

[0137] Furthermore, in the eighth embodiment, the center of gravity G8 of the electric cutter 800 is also located at a position overlapping with the blade 60 and the support portion 80A in the vertical direction of the electric cutter 800 when viewed from the side. Specifically, when viewed from the side, the center of gravity G8 overlaps with the elevator housing portion 20F and is located within the range of the width dimension B of the blade 60 and the range of the width dimension A of the support portion 80A in the vertical direction. Therefore, in the standing posture of the electric cutter 800, the center of gravity G8 of the electric cutter 800 is located on the vertical lower side of the blade 60 for cutting the workpiece W. Thus, as in the first embodiment, the operability of the electric cutter 800 can be improved.

[0138] Furthermore, in the eighth embodiment, the front end of the grip 20A2 held by the operator is arranged at the rear side of the head 80, and overlaps with the support portion 80A of the head 80 when viewed from the front-back direction. Specifically, when viewed from the left-right direction, the front end of the grip 20A2 is arranged within the range of the width dimension A of the support portion 80A, and the grip 20A2 extends in a direction that is inclined downward as it moves toward the rear side. In other words, when viewed from the left-right direction, the front end of the grip 20A2 is located at the same position as the support portion 80A in the up-down direction. Therefore, similarly to the first embodiment, when the processed material W as a light steel keel fixed to the ceiling or the like is installed on the electric cutting machine 800, the front end of the grip 20A2 is arranged on the lower side of the support portion 80A in the vertical direction. As a result, the operator can easily install the processed material W on the support portion 80A of the head 80 by holding the front end of the grip 20A2. As described above, the operability of the electric cutting machine 800 can be improved. In addition, since the grip 20A2 is inclined with respect to the front-rear direction, the weight of the head 80 when it is raised can be received by the palm, and a structure that is not easy to get tired can be provided.

[0139] In the eighth embodiment, the trigger 30 is provided at the front end of the grip 20A2, and a portion of the trigger 30 overlaps the support 80A when viewed from the front-back direction. Specifically, a portion of the trigger 30 is arranged within the range of the width dimension A of the support 80A when viewed from the left-right direction. Thus, as in the first embodiment, the trigger 30 can be operated by the hand holding the grip 20A2 while the operator's hand is arranged at the rear side of the support 80A. Therefore, the operability of the electric cutting machine 800 can be further improved.

[0140] In addition, in the eighth embodiment, the housing 20 extends in the front-rear direction, and the gripping portion 20A2 constitutes the rear end portion of the housing 20. Therefore, when the workpiece W as a light steel keel fixed to the ceiling or the like is installed on the electric cutting machine 800, the gripping portion 20A2 can be located at the lower side in the vertical direction compared to the first embodiment. As a result, the lifting amount of the electric cutting machine 800 by the operator can be reduced. Therefore, the operability of the electric cutting machine 800 can be further improved.

[0141] In the eighth embodiment, the motor housing portion 20B and the battery mounting portion 20D are arranged in the middle portion of the housing 20 in the front-rear direction and arranged side by side in the up-down direction. Thus, the motor 40 and the battery 24 can be concentrated in the middle portion of the housing 20 in the front-rear direction and the grip portion 20A2 can be set at the rear end portion of the housing 20.

[0142] (Ninth Embodiment) Next, use Fig.17(A) and (B) describe an electric cutting machine 900 as a working machine of the ninth embodiment. The electric cutting machine 900 of the ninth embodiment is configured similarly to the electric cutting machine 10 of the first embodiment except for the following aspects. Fig.17 In (A) and (B), the same reference numerals are given to components having the same configuration as the electric cutting machine 10 according to the first embodiment.

[0143] That is, in the ninth embodiment, the housing 20 extends in the front-to-back direction, and the dimension of the housing 20 in the front-to-back direction is set longer than that in the first embodiment. The housing 20 has: the same elevator housing portion 20F as in the eighth embodiment, the motor housing portion 20B constituting the middle portion of the housing 20 in the front-to-back direction, and the grip portion 20A2 constituting the rear end portion of the housing 20.

[0144] The elevator housing portion 20F constitutes the front end portion of the housing 20, and the feed screw mechanism 50 is housed in the elevator housing portion 20F. The motor housing portion 20B is arranged on the rear side of the elevator housing portion 20F, and the lower portion of the motor housing portion 20B protrudes further downward than the elevator housing portion 20F. The motor housing portion 20B houses the motor 40. In addition, a battery mounting portion 20D is provided at the rear end portion of the motor housing portion 20B, and the battery 24 protrudes to the rear side from the battery mounting portion 20D. The controller 90 is housed in the motor housing portion 20B.

[0145] The grip 20A2 is disposed away from the battery 24 and extends substantially vertically. The housing 20 has a pair of upper and lower handle guards 20C extending forward from both ends of the grip 20A2 in the longitudinal direction and connected to the rear end of the motor housing 20B.

[0146] Furthermore, in the ninth embodiment, the center of gravity G9 of the electric cutting machine 900 is also located at a position overlapping with the blade 60 and the support portion 80A in the vertical direction of the electric cutting machine 900 when viewed from the side. Specifically, when viewed from the side, the center of gravity G9 overlaps with the elevator housing portion 20F and is located within the range of the width dimension B of the blade 60 and the range of the width dimension A of the support portion 80A in the vertical direction. Therefore, in the standing posture of the electric cutting machine 900, the center of gravity G9 of the electric cutting machine 900 is located on the vertical lower side of the blade 60 for cutting the workpiece W. Thus, as in the first embodiment, the operability of the electric cutting machine 900 can be improved.

[0147] Furthermore, in the ninth embodiment, the upper portion of the grip 20A2 held by the operator is arranged at the rear side of the head 80, and overlaps with the support portion 80A of the head 80 when viewed from the front-back direction. Specifically, when viewed from the left-right direction, the upper portion of the grip 20A2 is arranged within the range of the width dimension A of the support portion 80A, and the grip 20A2 extends in the up-down direction. In other words, when viewed from the left-right direction, the upper portion of the grip 20A2 is located at the same position as the support portion 80A in the up-down direction. Therefore, similarly to the first embodiment, when the processed material W as a light steel keel fixed to the ceiling is installed on the electric cutting machine 900, the upper portion of the grip 20A2 is arranged on the lower side of the support portion 80A in the vertical direction. As a result, the operator can easily install the processed material W on the support portion 80A of the head 80 by holding the upper portion of the grip 20A2. As described above, the operability of the electric cutting machine 900 can be improved.

[0148] In addition, in the ninth embodiment, the trigger 30 is provided at the upper end of the grip 20A2, and a part of the trigger 30 overlaps with the support 80A when viewed from the front-back direction. Specifically, when viewed from the left-right direction, a part of the trigger 30 is arranged within the range of the width dimension A of the support 80A (located at the same position as the support 80A in the up-down direction). Thus, as in the first embodiment, the trigger 30 can be operated by the hand holding the grip 20A2 while maintaining the state where the operator's hand is arranged on the rear side of the support 80A. Therefore, the operability of the electric cutting machine 900 can be further improved.

[0149] In the ninth embodiment, the housing 20 extends in the front-rear direction, and the grip 20A2 constitutes the rear end of the housing 20. Therefore, similarly to the eighth embodiment, when the workpiece W as a light steel keel fixed to a ceiling or the like is installed on the electric cutting machine 900, the grip 20A2 can be located at the lower side in the vertical direction compared to the first embodiment. As a result, the lifting amount of the electric cutting machine 900 by the operator can be reduced.

[0150] In the ninth embodiment, the motor housing portion 20B and the battery mounting portion 20D are arranged in the middle portion of the housing 20 in the front-rear direction and arranged side by side in the front-rear direction. Thus, as in the eighth embodiment, the motor 40 and the battery 24 can be concentrated in the middle portion of the housing 20 in the front-rear direction and the grip portion 20A2 can be set at the rear end portion of the housing 20.

[0151] (Tenth Embodiment) Next, use Fig.18(A) and (B) describe an electric cutting machine 1000 as a working machine according to the tenth embodiment. The electric cutting machine 1000 according to the tenth embodiment is configured similarly to the electric cutting machine 10 according to the first embodiment except for the following aspects. Fig.18 In (A) and (B), the same reference numerals are given to components having the same configuration as the electric cutting machine 10 according to the first embodiment.

[0152] That is, in the tenth embodiment, the housing 20 extends in the front-to-back direction, and the dimension of the housing 20 in the front-to-back direction is set longer than that in the first embodiment. The housing 20 has: the same elevator housing portion 20F as in the ninth embodiment, the motor housing portion 20B constituting the middle portion of the housing 20 in the front-to-back direction, and the grip portion 20A2 constituting the rear end portion of the housing 20.

[0153] The elevator housing portion 20F constitutes the front end portion of the housing 20, and the feed screw mechanism 50 is housed in the elevator housing portion 20F. The motor housing portion 20B is arranged on the rear side of the elevator housing portion 20F, and the lower portion of the motor housing portion 20B protrudes downward more than the elevator housing portion 20F. The motor housing portion 20B houses the motor 40 and the controller 90. In addition, a battery mounting portion 20D protruding downward is provided at the rear end portion of the elevator housing portion 20F, and the battery 24 protrudes downward from the battery mounting portion 20D.

[0154] The grip 20A2 is arranged to be spaced apart from the motor housing 20B and to extend in a substantially vertical direction. The housing 20 has a pair of upper and lower handle guards 20C extending forward from both ends of the grip 20A2 in the longitudinal direction and connected to the rear end of the motor housing 20B.

[0155] Furthermore, in the tenth embodiment, the center of gravity G10 of the electric cutting machine 1000 is also located at a position overlapping with the blade 60 and the support portion 80A in the vertical direction of the electric cutting machine 1000 when viewed from the side. Specifically, when viewed from the side, the center of gravity G10 overlaps with the elevator housing portion 20F and is located within the range of the width dimension B of the blade 60 and the range of the width dimension A of the support portion 80A in the vertical direction. Therefore, in the standing posture of the electric cutting machine 1000, the center of gravity G10 of the electric cutting machine 1000 is located on the vertical lower side of the blade 60 for cutting the workpiece W. Thus, as in the first embodiment, the operability of the electric cutting machine 1000 can be improved.

[0156] Furthermore, in the tenth embodiment, similarly to the ninth embodiment, the upper portion of the grip 20A2 held by the operator is arranged at the rear side of the head 80, and overlaps with the support portion 80A of the head 80 when viewed from the front-back direction. Specifically, when viewed from the left-right direction, the upper portion of the grip 20A2 is arranged within the range of the width dimension A of the support portion 80A, and the grip 20A2 extends in a direction that is inclined downward as it moves toward the rear side. Therefore, similarly to the ninth embodiment, the operator can easily place the workpiece W on the support portion 80A of the head 80 by holding the upper portion of the grip 20A2. As described above, the operability of the electric cutting machine 1000 can be improved.

[0157] In the tenth embodiment, similarly to the ninth embodiment, the trigger 30 is provided at the upper end of the grip 20A2, and when viewed from the front-back direction, the trigger 30 overlaps with the support 80A. Specifically, when viewed from the left-right direction, the trigger 30 is arranged within the range of the width dimension A of the support 80A. Thus, similarly to the ninth embodiment, the trigger 30 can be operated by the hand holding the grip 20A2 while the operator's hand is arranged at the rear side of the support 80A. Therefore, the operability of the electric cutting machine 1000 can be further improved.

[0158] In the tenth embodiment, the housing 20 extends in the front-rear direction, and the grip 20A2 constitutes the rear end of the housing 20. Therefore, similarly to the ninth embodiment, when the workpiece W as a light steel keel fixed to a ceiling or the like is installed on the electric cutting machine 1000, the grip 20A2 can be located at the lower side in the vertical direction. As a result, the lifting amount of the electric cutting machine 1000 by the operator can be reduced.

[0159] In the tenth embodiment, the motor housing portion 20B and the battery mounting portion 20D are arranged in the middle portion of the housing 20 in the front-rear direction and arranged side by side in the front-rear direction. Thus, as in the fifth embodiment, the motor 40 and the battery 24 can be concentrated in the middle portion of the housing 20 in the front-rear direction and the grip portion 20A2 can be set at the rear end portion of the housing 20.

[0160] Explanation of symbols

[0161] 10: Electric cutting machine (operating machine)

[0162] 20: Shell

[0163] 20A: Handle housing (grip)

[0164] 20A2: Grip

[0165] 22: Battery terminal (power supply unit)

[0166] 40: Motor

[0167] 60: Blade (cutting tool)

[0168] 60A: Blade

[0169] 60B: The tip of the blade

[0170] 80A: Support part

[0171] 200: Electric cutting machine (operating machine)

[0172] 300: Electric cutting machine (operating machine)

[0173] 400: Electric cutting machine (operating machine)

[0174] 500: Electric cutting machine (operating machine)

[0175] G1: Center of Gravity

[0176] G2: Center of Gravity

[0177] G3: Center of Gravity

[0178] G4: Center of Gravity

[0179] G5: Center of Gravity

[0180] G6: Center of Gravity

[0181] G7: Center of Gravity

[0182] G8: Center of Gravity

[0183] G9: Center of Gravity

[0184] G10: Center of Gravity

[0185] W: Processed material (light steel keel)

Claims

1. A working machine, comprising: A housing extending along a first direction; as well as The cutting tool is arranged on one side of the first direction of the housing so as to be reciprocatingly movable in the first direction, and is formed into a plate shape with a second direction orthogonal to the first direction as a width direction and a third direction orthogonal to the first direction and the second direction as a plate thickness direction, and cuts the light steel keel by moving to one side of the first direction, When viewed from the third direction, the center of gravity is located at a position overlapping the cutting tool in the second direction.

2. The working machine according to claim 1, wherein: The housing has a grip portion, and at least a portion of the grip portion is disposed at a position overlapping the center of gravity in the first direction.

3. The working machine according to claim 2, wherein: The holding portion extends along the first direction.

4. The working machine according to claim 3, wherein: A support portion for supporting the light steel keel is provided on one side of the first direction relative to the cutting tool. A V-shaped blade portion is formed at one end portion of the cutting tool in the first direction and protrudes toward one side of the first direction when viewed from the third direction. In the second direction, the front end portion of the blade portion is configured at a position offset to one side of the second direction relative to the center portion of the support portion in the second direction, and the center of gravity is located at a position offset to the other side of the second direction relative to the center portion of the support portion in the second direction.

5. The working machine according to claim 4, wherein: The housing contains a motor for reciprocating the cutting tool. The motor is disposed at a position offset to one side in the second direction with respect to a center portion of the support portion in the second direction.

6. The working machine according to claim 5, wherein: The housing is provided with a power supply unit for supplying power to the motor. The power supply unit is arranged at a position offset to the other side in the second direction with respect to the center of the support unit in the second direction.

7. The working machine according to claim 6, wherein: When viewed from the third direction, a portion of the grip portion is located outside an imaginary circle that is centered at a central portion of the support portion in the second direction and passes through the center of gravity.

8. The working machine according to claim 7, wherein: When viewed from the third direction, a portion of the grip portion is located at a position overlapping the support portion in the second direction.

9. A working machine comprising: A cutting tool configured to be reciprocatingly movable in a first direction; a processing portion having a supporting portion, the supporting portion being arranged on one side of the first direction relative to the cutting tool, being formed into a comb shape open to the other side of the first direction and supporting the light steel keel; and A gripping portion is arranged on the other side of the first direction relative to the cutting tool, When viewed from the first direction, at least a portion of the grip portion overlaps with the support portion.

10. The working machine according to claim 9, wherein: The grip portion is provided with an operation portion for instructing the start of movement of the cutting tool. When viewed from the first direction, at least a portion of the operating portion overlaps the supporting portion.

11. The working machine according to claim 10, wherein: The holding portion extends along the first direction, and the operating portion is disposed at one end portion of the holding portion in the first direction.

12. The working machine according to any one of claims 9 to 11, comprising: a housing extending along the first direction and arranged on the other side of the cutting tool in the first direction; as well as a motor for driving the cutting tool, The grip portion constitutes one side portion of the housing in the first direction. The other end portion of the housing in the first direction is configured as a motor housing portion that accommodates the motor.

13. The working machine according to claim 12, wherein: A direction orthogonal to the first direction is a second direction, The motor housing portion is provided with a battery mounting portion for mounting a battery for supplying power to the motor, and the battery mounting portion is arranged on one side of the motor in the second direction.

14. The working machine according to claim 13, wherein: The housing has a protection portion extending along the first direction, The protection portion is disposed on one side of the holding portion in the second direction and one side of the battery installation portion in the first direction.

15. A working machine comprising: A flat-plate-shaped cutting tool configured to be reciprocatingly movable in a first direction between an initial position and a processing position and extending in the first direction and a second direction orthogonal to the first direction; a processing portion having a support portion, the support portion being disposed on one side of the first direction relative to the cutting tool located at the initial position, being formed into a comb shape open to the other side of the first direction and supporting the light steel keel; and a gripping portion, arranged on the other side of the first direction relative to the cutting tool located at the initial position, When viewed from a third direction that is orthogonal to both the first direction and the second direction, at least a portion of the gripping portion is located at the same position as the supporting portion in the second direction.

Images