JP6164575B2 - Work tools - Google Patents

Description

  The present invention relates to a work tool, and more particularly to a work tool for cutting a branch or the like located at a height of a standing tree.

  Conventionally, as a work tool for cutting branches such as garden trees and roadside trees, for example, a pole saw 500 as shown in FIG. 12 and a pole saw as shown in FIG. 13 are known (Patent Document 1). The pole saw 500 mainly includes a long operation rod 501, an engine 502 provided on one end side of the operation rod 501, and a gear case 503 provided on the other end side of the operation rod 501. The force is transmitted to a gear in the gear case 503 through a shaft disposed in the operation rod 501, and the saw chain 504 attached to the gear case 503 is driven to circulate, thereby cutting the workpiece W such as a branch located at a high place. I do.

  In addition, as a work tool for cutting branches and the like located in high places such as garden trees and street trees, a long operation rod with a shaft arranged inside, an engine provided on one end side of the operation rod, and the vicinity of the engine Mainly equipped with a throttle provided on the other end of the operation rod, and an output shaft provided on the gear case to which the tip tool can be attached and detached, and the user operates the throttle after driving the engine. Thus, a pruning machine is known in which the driving force of the engine is transmitted by the shaft and the output shaft starts to be driven, and the cutting work can be performed by driving the tip tool attached to the output shaft (Patent Document 2). ).

  In such a pruning machine, when it is necessary to change the tip tool during work, the user releases the throttle to stop driving the output shaft, and then stops driving the engine. In general, once the pruning machine main body is placed on the ground or the like, it is moved to the vicinity of the output shaft separated from the engine and the throttle by the length of the operating rod, and the tip tool is attached and detached. However, depending on the progress of the work, etc., it may be necessary to quickly attach and detach the tip tool, and the user simply releases the throttle and stops driving the output shaft without stopping the engine. In many cases, the tip tool was attached and detached while the engine was idling.

JP-T-2006-523102 JP-A-7-322757

  However, since the saw chain 504 for cutting the workpiece W is generally wider than a saw blade or the like, there is a problem that a large amount of chips are generated. Also, the replacement of the saw chain 504 is not easy, and it takes time to fill the oil tank with oil (chain oil for preventing the saw chain 504 from seizing). It was. Further, in the pole saw 500, the axial extension line of the operation rod 501 and the saw chain 504 are displaced from each other, so that a moment is generated around the axis of the operation rod 501 and the operation may become difficult. There is a problem that an intuitive operation is difficult because the cutting work is performed by visually recognizing the workpiece W at a position shifted from the extension line 501.

  Further, in the above-described pruning machine, since the user who attaches / detaches the tip tool and the throttle which drives the output shaft are separated by the length of the operating rod, the user can move the throttle tool while the tip tool is attached / detached. It is not easy to pay attention. For this reason, when a user who attaches / detaches the tip tool while the engine is idling, tilts or moves the entire pruning machine, the throttle may be touched and operated by an unexpected obstacle. When the throttle is unexpectedly operated, there is a problem that the output shaft is driven and it is difficult to attach and detach the tip tool. Similarly, in a pruning machine having a long operation rod using an electric motor as a drive source, a drive switch for driving the tip tool is not intended while the user is attaching or detaching the tip tool. There is a problem that the output shaft starts to be turned on and it becomes difficult to attach and detach the end tool. Furthermore, even for work tools that do not have a long operating rod, the output shaft may be driven unintentionally during the attachment / detachment of the tip tool, and the output shaft must be securely stopped when the tip tool is attached / detached. Was desired.

  Therefore, the present invention can be operated intuitively, can suppress the generation of chips, does not need to be filled with oil (chain oil) in the oil tank, and can be replaced by a simple operation. The object is to provide possible work tools. The present invention also provides a work tool that prevents unintentional driving of the output shaft by stopping the drive source when the user attaches / detaches the tip tool, thereby improving convenience in attaching / detaching the tip tool. The purpose is to provide.

  In order to solve the above-described problems, the present invention provides a drive source, a drive shaft having one end connected to the drive source, which is rotationally driven by the drive force of the drive source, and a housing that covers the other end of the drive shaft. And a reciprocating motion conversion mechanism that is provided in the housing and converts the rotation of the drive shaft into a reciprocating motion, and is connected to the reciprocating motion converting mechanism and is reciprocated by the reciprocating motion converting mechanism. An output shaft capable of supporting the drive source on one end side, supporting the reciprocating motion conversion mechanism on the other end side, and disposing the drive shaft inside the output shaft. When the blade is attached, the straight line including the axis of the operation rod and the saw blade are separated from each other when viewed from a direction orthogonal to the plane including the operation rod and the output shaft. Provide work tools.

  According to such a configuration, since the cutting operation can be performed by the saw blade, the amount of chips after cutting the material to be cut can be suppressed. In addition, since it is not necessary to fill the oil tank with oil (chain oil), the burden on the user can be reduced. Furthermore, since the straight line including the axis of the operating rod and the saw blade are separated from each other, the material to be cut can be caught on the axial extension line of the operating rod. For this reason, a user can operate intuitively and operability can be improved more.

  In the above configuration, it is preferable that the side surface of the saw blade is substantially parallel to the plane in a state where the saw blade is attached to the output shaft.

  According to such a configuration, the moment centering on the operating rod can be suppressed, so that the operability can be improved.

  The reciprocating motion conversion mechanism is connected to the drive shaft, is rotationally driven by the drive shaft, and has a drive transmission shaft having an inclined shaft, and an oscillating portion attached to the inclined shaft and reciprocatingly driving the output shaft It is preferable to have.

  According to such a configuration, since the reciprocating plate attached to the inclined shaft reciprocates as the drive transmission shaft rotates, the output shaft can be driven to reciprocate with a simple configuration.

  And a guide sleeve that is swingably supported in the housing, and a guide member that is disposed in the housing and has a track surface that extends along the reciprocating direction of the output shaft. The shaft has a swing roller that is slidably reciprocated in the guide sleeve and can roll on the raceway surface, and a tip portion of the saw blade attached to the output shaft is provided with the swing roller. It is preferable that a trajectory according to the shape of the raceway surface is drawn by rolling on the raceway surface and the output shaft being driven to reciprocate.

  According to such a structure, since the operation | movement of the direction orthogonal to the reciprocation direction can be added to an output shaft, cutting force can be improved.

  Moreover, it is preferable that a vibration absorbing mechanism for reducing vibration generated due to the reciprocating motion of the output shaft is disposed in the casing.

  According to such a configuration, since vibration generated due to the reciprocating motion of the output shaft can be reduced, operability can be further improved.

  Moreover, it is preferable that an attachment / detachment mechanism is provided at the end of the output shaft so that the saw blade can be attached / detached to / from the output shaft by being operated in a single direction.

  According to such a configuration, since the saw blade can be attached to and detached from the output shaft only by a simple operation, convenience can be improved.

  The present invention further includes a first housing, a long operation rod having one end connected to the first housing, a second housing connected to the other end of the operation rod, and the first housing A drive source housed in the housing, a drive shaft rotatably supported in the operation rod and driven to rotate by the drive source, and a drive shaft provided in the second housing, reciprocating the rotation of the drive shaft A reciprocating motion converting mechanism for converting into motion, and an output shaft connected to the reciprocating motion converting mechanism, reciprocatingly driven by the reciprocating motion converting mechanism, and capable of attaching a saw blade, the saw blade being attached to the output shaft. Provided is a work tool characterized in that a side surface of the saw blade is substantially parallel to a plane including the operating rod and the output shaft in the attached state.

  According to such a configuration, since the cutting operation can be performed by the saw blade, the amount of chips after cutting the material to be cut can be suppressed. Further, since it is not necessary to fill the oil tank with oil, the burden on the user can be reduced. Furthermore, since the moment around the operating rod can be suppressed, the operability can be improved.

  In order to solve the above problems, the present invention further includes a drive source, a drive shaft that is rotationally driven by the drive source being driven, a reciprocating motion conversion mechanism that converts the rotational force of the drive shaft into a reciprocating motion, An output shaft connected to the reciprocating motion conversion mechanism and driven to reciprocate by the rotational force of the drive shaft via the reciprocating motion converting mechanism, and provided on the output shaft, and fixing a tip tool to the output shaft A tool fixing mechanism; a fixing mechanism detection unit that detects a state of the tool fixing mechanism; and a stopping unit that stops driving of the drive source when the fixing mechanism detection unit detects a release operation. A work tool characterized by the above is provided.

  According to such a configuration, it is possible to detect that the tip tool has been released from the output shaft, and when the user attaches / detaches the tip tool, driving of the drive source can be stopped. For this reason, when a user attaches and detaches a tip tool, it can control that an output shaft is driven unexpectedly, smooth attachment or detachment of a tip tool is realized, and convenience improves.

  In the above configuration, the tool fixing mechanism has an operation unit for releasing the fixing of the tip tool, and the fixing mechanism detecting unit releases the fixing of the tip tool when the operation unit is operated. It is preferable to be configured to detect this.

  According to such a configuration, since it is possible to detect that the fixing of the tip tool to the output shaft is released by the operation of the operation unit by the user, it is possible to reliably detect that the tip tool is attached or detached. And detection accuracy can be improved, and convenience is further improved.

  The tool fixing mechanism includes a locking member that fixes the tip tool to the output shaft, and the locking member fixes the tip tool to the output shaft at a first position, The fixing of the tip tool to the output shaft is released at a position, and the fixing mechanism detection unit is configured to detect that the fixing of the tip tool is released by the position of the locking member. preferable.

  According to such a configuration, it is detected from the position of the locking member that the fixing of the tip tool to the output shaft is released, so that it is possible to detect that the tip tool is being attached and detached more reliably. For this reason, detection accuracy can be improved more.

  Further, the stop means has a switch mechanism, and the fixing mechanism detection unit is pressed by the locking member when the locking member is in the first position, and the locking member The tool has a button that is not pressed by the locking member when in the second position, and the tool is not pressed by the locking member, so that the fixing of the tip tool is released. It is preferable that it is comprised so that it may detect.

  According to such a configuration, since it is detected that the fixing of the tip tool with respect to the output shaft is released by the pressing state of the button, it is possible to detect that the fixing of the tip tool is accurately released with a simple configuration. .

  The drive source is an engine including an ignition coil having a primary winding and a secondary winding, and a power generator that supplies current to the primary winding. In a state where the part is connected between the primary winding and the power generation device, the other end is connected to the ground, and it is not detected that the fixing mechanism detection unit has been released. The current generated by the power generator is caused to flow through the primary winding by disconnecting the secondary winding and the ground, allowing the engine to be driven, and the fixing mechanism detection unit being released. In a state where this is detected, the current generated by the power generation device is caused to flow through the ground by connecting the primary winding and the ground, and the supply of current to the primary winding is shut off. The engine is preferably configured to stop driving.

  According to such a configuration, when the user attaches / detaches the tip tool and the tip tool is not fixed to the output shaft, no current flows from the power generator to the primary winding. Does not induce voltage and the ignition coil does not work. For this reason, the engine is stopped, and it is possible to reliably prevent the output shaft from being driven unintentionally when the user is attaching and detaching the tip tool, and the convenience is further improved.

  Further, the drive source is an electric motor connected to a power source through the stop unit, and the stop unit is in a state where it is not detected that the fixing mechanism detection unit has been released. In a state where the electric power supply from the power source to the electric motor is allowed and the electric motor is allowed to be driven and the fixing mechanism detection unit is detected to be released, the electric motor is supplied from the power source to the electric motor. It is preferable that the power supply is cut off and the driving of the electric motor is stopped or maintained in a stopped state.

  According to such a configuration, when the user attaches / detaches the tip tool and the tip tool is not fixed to the output shaft, no current flows to the electric motor. For this reason, it is possible to reliably prevent the output shaft from being driven unintentionally when the user is attaching and detaching the tip tool, and the convenience is further improved.

  The present invention further includes a drive source, a drive shaft having one end connected to the drive source and driven to rotate when the drive source is driven, a housing covering the other end of the drive shaft, and one end side The driving source is supported at the other end, the casing is supported at the other end, and a long operating rod is disposed inside the driving shaft, and is provided in the casing and is driven by the rotational force of the driving shaft. Output shaft, a tool fixing mechanism that is provided on the output shaft and fixes the tip tool to the output shaft, a fixing mechanism detection unit that detects the state of the tool fixing mechanism, and the fixing mechanism detection unit is released Provided is a work tool comprising stop means for stopping the drive of the drive source when it is detected that it has been operated.

  According to such a configuration, it is possible to detect that the tip tool has been released from the output shaft, and when the user attaches / detaches the tip tool, driving of the drive source can be stopped. For this reason, when a user attaches and detaches a tip tool, it can control that an output shaft is driven unexpectedly, smooth attachment or detachment of a tip tool is realized, and convenience improves.

  According to the work tool of the present invention, it is possible to provide a work tool that improves operability and convenience and enables intuitive operation. Further, according to the work tool of the present invention, when the user attaches / detaches the tip tool, the drive source is stopped, the unintentional driving of the output shaft is prevented, and the convenience in attaching / detaching the tip tool is improved. be able to

It is a side view which shows the whole external appearance of the working tool by the 1st Embodiment of this invention. It is a top view which shows the whole external appearance of the working tool by the 1st Embodiment of this invention. It is a partial cross section side view which shows the inside of the gear housing of the working tool by the 1st Embodiment of this invention. It is a partial cross section top view which shows the attachment / detachment mechanism of the working tool by the 1st Embodiment of this invention. It is a top view which shows the gear housing of the working tool by the 1st Embodiment of this invention. It is the schematic which shows operation | movement of the reciprocating motion conversion mechanism of the working tool by the 1st Embodiment of this invention, (a) is a state in which a plunger exists in a rear dead center, (b) is in a front dead center. Indicates the state. It is a partial cross section side view which shows the inside of the gear housing of the working tool by the 2nd Embodiment of this invention. It is the schematic which shows the operation | movement of the orbital cutting | disconnection of the working tool by the 2nd Embodiment of this invention, (a) is the front dead center of the state which is not pressing the blade against a to-be-cut material, (b) is to-be-cut material The front dead center in a state where the blade is pressed against the workpiece, and (c) shows the rear dead center in the state where the blade is pressed against the material to be cut. It is a partial cross section side view which shows the inside of the gear housing of the working tool by the 3rd Embodiment of this invention. It is the schematic which shows operation | movement of the reciprocating motion conversion mechanism of the working tool by the 3rd Embodiment of this invention, (a) is a state in which a plunger exists in a rear dead center, (b) is in a front dead center. Indicates the state. It is a side view which shows the whole external appearance of the working tool by the 4th Embodiment of this invention. It is a side view which shows the whole external appearance of the conventional work tool. It is a figure which shows the use condition of the conventional work tool. It is a side view which shows the whole external appearance of the working tool by the 5th Embodiment of this invention. It is a partial cross section side view which shows the engine inside of the working tool by the 5th Embodiment of this invention. It is a rear view which shows the magnet rotor of the working tool by the 5th Embodiment of this invention. It is a circuit diagram including the block diagram which shows the ignition circuit of the working tool by the 5th Embodiment of this invention, (a) shows the state which has permitted the electric current supply to a spark plug, (b) is ignition The state where the current supply to the plug is cut off is shown. It is a partial cross section side view which shows the gear housing of the working tool by the 5th Embodiment of this invention. It is an external appearance side view which shows the state by which the braid | blade is being fixed to the plunger of the work tool by the 5th Embodiment of this invention. It is AA sectional drawing which shows the state by which the braid | blade is being fixed to the plunger of the work tool by the 5th Embodiment of this invention. It is an external appearance side view which shows the state by which the fixation of the braid | blade with respect to the plunger of the work tool by the 5th Embodiment of this invention is cancelled | released. It is BB sectional drawing which shows the state by which the fixation of the braid | blade with respect to the plunger of the working tool by the 5th Embodiment of this invention is cancelled | released.

  First, a working tool according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, a pole saver saw 1 as a work tool according to the first embodiment of the present invention includes a housing 2 that covers a part of an internal combustion engine 2A, an operating rod 3 having a handle 33, The gear housing 4, the reciprocating motion conversion mechanism 5, the plunger 6, and the blade holder 7 are mainly configured, and are used in a state where the blade 8 is attached to the plunger 6. In the following description, the direction in which the operating rod 3 extends with respect to the housing 2 is defined as the front direction, and the reverse direction is defined as the rear direction. The direction in which the handle 33 extends with respect to the operating rod 3 is defined as the upward direction, and the reverse direction is defined as the downward direction. Further, in FIG. 1, the right when the pole saver saw 1 is viewed from the rear is defined as the right direction, and the reverse direction is defined as the left direction.

  The housing 2 covers a part of the internal combustion engine 2A corresponding to a drive source, and mainly includes a fuel tank 21 and a starter handle 22, and includes components necessary for driving the internal combustion engine 2A. Yes. The housing 2 is an example of the first housing of the present invention.

  The internal combustion engine 2A includes a rotation shaft (not shown) and a centrifugal clutch (not shown). A rotating shaft (not shown) is driven to rotate when the internal combustion engine 2A is driven. A centrifugal clutch (not shown) is connected to a rotating shaft (not shown).

  The fuel tank 21 is provided in the lower part of the housing 2, and the fuel for driving the internal combustion engine 2A is accommodated therein. The starter handle 22 is provided on the left side of the rear end portion of the housing 2.

  The operating rod 3 is a long cylindrical member extending in the front-rear direction, and is connected to the front portion of the housing 2 and connected to the rear portion of the gear housing 4, and the length in the front-rear direction is about 1 to 4 m. Designed. In other words, the operating rod 3 supports the housing 2 and the internal combustion engine 2A partially covered with the housing 2 at one end side (rear end side), and the gear housing 4 and the other end side (front end side). The reciprocating motion conversion mechanism 5 in the gear housing 4 is supported. The operating rod 3 includes a grip 31, a hanger 32, and a handle 33, and a drive shaft 34 shown in FIG.

  The grip 31 is a portion that is held by the user, and is provided at the rear portion of the operation rod 3. The grip 31 includes a throttle 31A and a stop switch 31B.

  The throttle 31A is provided on the lower side of the grip 31, and can adjust the fuel injection amount by making the amount pushed in the direction of the operating rod 3 variable. The stop switch 31B is a switch that is connected between, for example, an ignition plug and a power generator and can be switched between an operation position and a stop position. The internal combustion engine is pulled by switching the stop switch 31B to the operation position and pulling the starter handle 22. 2A can be driven. Further, the internal combustion engine 2A can be stopped by switching the stop switch 31B to the stop position while the internal combustion engine 2A is being driven.

  The hanger 32 is a part to which a shoulder band (not shown) is attached, and is provided in front of the grip 31. In a state where the shoulder band is attached to the hanger 32, the user uses the pole saver saw 1 by placing the shoulder band on the shoulder.

  The handle 33 is a so-called loop handle that is provided in front of the hanger 32 and has a ring shape when viewed from the front, and includes a gripping portion 33A and a connecting portion 33B. The gripping portion 33A is a portion that is gripped by a hand opposite to the hand that grips the grip 31, and has a bar shape extending in the left-right direction, and is positioned above the operation rod 3. The connecting portion 33B connects the left and right end portions of the gripping portion 33A and both side surfaces of the operating rod 3 respectively. The user uses the pole saver saw 1 while holding the shoulder band on the shoulder, holding the grip 31 with one hand, and holding the approximate center in the left-right direction of the holding portion 33A with the other hand. As shown in FIG. 2, the gripping portion 33 </ b> A gripped by the user and the grip 31 are positioned on the axis of the operating rod 3 in a top view, so that stable operability is ensured.

  As shown in FIG. 3, the drive shaft 34 is a shaft extending from the gear housing 4 to the housing 2 through the inside of the operating rod 3 in the front-rear direction, and is rotationally driven by the driving force of the internal combustion engine 2A. A rear end portion of the drive shaft 34 is connected to the internal combustion engine 2 </ b> A via a centrifugal clutch in the housing 2, and a front end portion is connected to the reciprocating motion conversion mechanism 5. The drive shaft 34 is rotatably supported by a ball bearing 4 </ b> A in the gear housing 4, a ball bearing (not shown) in the operation rod 3, and a ball bearing (not shown) in the housing 2. The portion is provided with a pinion 34A.

  The gear housing 4 corresponding to the housing is connected to the front end portion of the operating rod 3, and the reciprocating motion conversion mechanism 5 and the plunger 6 are mainly accommodated therein. The gear housing 4 is an example of the second housing of the present invention.

  The reciprocating motion conversion mechanism 5 is disposed in the lower part inside the gear housing 4 and includes a drive transmission shaft 51 and a reciprocating plate 52 corresponding to a swinging portion.

  The drive transmission shaft 51 extends in the front-rear direction substantially parallel to the drive shaft 34, and is positioned in front of and below the drive shaft 34, and is rotatably supported by the ball bearing 4B and the ball bearing 4C supported by the gear housing 4. Has been. The drive transmission shaft 51 includes a drive transmission gear 51A and an inclined shaft 51B.

  The drive transmission gear 51 </ b> A is coaxially fixed to the rear portion of the drive transmission shaft 51 and meshes with the pinion 34 </ b> A of the drive shaft 34. The rotational force of the drive shaft 34 is transmitted to the drive transmission shaft 51 via the pinion 34A and the drive transmission gear 51A.

  The inclined shaft 51B is provided on the drive transmission shaft 51 in a state where the axis of the inclined shaft 51B is inclined with respect to the axis of the drive transmission shaft 51. The inclined shaft 51B is configured to rotate with the drive transmission shaft 51 around the axis of the drive transmission shaft 51.

  The reciprocating plate 52 is rotatably attached to the inclined shaft 51B via two ball bearings 5A that are in contact with the inclined shaft 51B and extends in a direction perpendicular to the axis of the inclined shaft 51B. 52A. The tip of the swing arm 52A is connected to the plunger 6.

  The plunger 6 corresponding to the output shaft has a substantially cylindrical shape extending in the front-rear direction, is located in front of and above the drive shaft 34, and has a substantially parallel positional relationship with the drive shaft 34. The plunger 6 is supported by the gear housing 4 so as to be reciprocally slidable in the front-rear direction via a metal bearing 4D. Further, the plunger 6 is formed with an insertion hole 6 a and a blade attachment portion 61.

  The insertion hole 6a is formed in a substantially circular shape in bottom view below the rear portion of the plunger 6, and a part of the swing arm portion 52A of the reciprocating plate 52 is inserted therethrough. In a state in which a part of the swing arm part 52A is inserted, the tip of the swing arm part 52A is rotatably connected to the plunger 6 by a connector pin 6A penetrating the rear part of the plunger 6 left and right.

  As shown in FIGS. 3 and 4, the blade attachment portion 61 is formed at the front end portion of the plunger 6, and a slit 61a, an attachment hole 61b, and a pin insertion hole portion 61c are formed. The slit 61a is a hole penetrating in the up-down direction extending rearward from the front end surface of the blade mounting portion 61, and is configured such that the rear end portion of the blade 8 can be inserted. The mounting hole 61b is a hole penetrating in the left-right direction behind the slit 61a, and allows a fastening member 7A described later to pass therethrough. The pin insertion hole 61c is a circular hole in a side view that penetrates from the front left side of the blade mounting portion 61 to the slit 61a, and has a reduced diameter hole portion 61d having a small hole diameter in the vicinity of the slit 61a. doing. A stepped portion 61A is formed on the outer periphery of the reduced diameter hole portion 61d.

  The blade holder 7 is fixed to the blade attachment portion 61 by a fastening member 7 </ b> A, and includes a locking pin 71, a knob 72, and a holder case 73. A blade 8 corresponding to a saw blade attached to the plunger 6 extends in the front-rear direction and includes a blade portion for cutting a material to be cut at a front lower end portion. The blade 8 has a thickness of about 0.9 to 1.6 mm, and a locking hole 8a is formed at the rear end thereof.

  The locking pin 71 includes a first cylindrical portion 71A, a second cylindrical portion 71B, and a conical portion 71C. The first cylindrical portion 71A has a cylindrical shape extending in the left-right direction, and the length in the left-right direction is designed to be shorter than the width in the left-right direction of the slit 61a. The first cylindrical portion 71 </ b> A is inserted through the locking hole 8 a of the blade 8 and fixes the blade 8 to the blade mounting portion 61. The second cylindrical portion 71B has a cylindrical shape having a diameter larger than the diameter of the first cylindrical portion 71A, and the diameter is configured to be slightly smaller than the diameter of the reduced diameter hole portion 61d. The conical portion 71C has a shape in which a conical shape is connected to a cylindrical shape, and a portion on the cylindrical shape is larger than the diameter of the second cylindrical portion 71B and slightly smaller than the diameter of the pin insertion hole portion 61c. have. A spring 7B is provided on the outer side in the radial direction of the second cylindrical portion 71B. One end portion in the left-right direction contacts the conical portion 71C, and the other end contacts the stepped portion 61A of the pin insertion hole portion 61c. Touching. The spring 7B biases the locking pin 71 in a direction (left direction) in which the blade 8 is not fixed to the blade mounting portion 61.

  The knob 72 includes a spring accommodating portion 72A, an arm portion 72B, a protruding portion 72C, and an operation portion 72D. The spring accommodating portion 72A has a substantially circular shape when viewed from the side, and a coil spring 72E is accommodated therein, and a through hole 72a that allows the fastening member 7A to penetrate is formed on the left side surface. The arm portion 72B extends forward from the front upper portion of the spring accommodating portion 72A, and the surface facing the pin insertion hole portion 61c of the blade mounting portion 61 is inclined to the left as it goes from below to above. A surface 71F is defined. The inclined surface 71F is in contact with the conical portion 71C of the locking pin 71, and restricts the locking pin 71 from moving to the left than in the state of FIG. The coil spring 72E biases the arm portion 72B upward. That is, the coil spring 72E maintains a state where the arm portion 72B restricts the movement of the locking pin 71 in the left direction (the state shown in FIG. 4). The protruding portion 72C protrudes leftward from the front left side surface of the arm portion 72B, and an operation portion 72D is provided at the left end portion thereof.

  The holder case 73 is formed so as to cover the entire blade attachment portion 61, and a portion of the front end surface facing the slit 61a is open in the vertical direction. A portion of the knob 72 that faces the protruding portion 72C is formed with a hole that allows the protruding portion 72C to protrude leftward. In addition, a through hole 73 a that allows the fastening member 7 </ b> A to pass therethrough is formed in the rear portion of the right side surface of the holder case 73.

  In FIG. 4, the blade 8 is attached to the blade attachment portion 61. However, when the knob 72 is pushed downward, the locking pin 71 is moved leftward along the inclined portion 72F by the urging force of the spring 7B. The first cylindrical portion 71A moves out of the locking hole 8a, and the blade 8 is fixed to the blade mounting portion 61. That is, the blade 8 can be removed from the blade mounting portion 61 only by an operation of pushing down the knob 72 downward. When it is desired to attach the blade 8 to the blade attachment portion 61 again, the knob 72 is pushed downward, the blade 8 is inserted into the slit 61a with the locking pin 71 moved to the left, and the knob 72 is released. Thus, the knob 72 is returned to the state shown in FIG. 4 by the coil spring 72E, and the blade 8 is fixed to the blade mounting portion 61.

  As described above, the blade attachment portion 61 and the blade holder 7 constitute an attachment / detachment mechanism, and the blade 8 can be attached to and detached from the plunger 6 by a simple procedure of operating the knob 72 in a single direction, so-called one-touch. Yes. In addition, since the thin blade 8 can be attached to the plunger 6 to perform the cutting operation, the amount of chips generated can be suppressed as compared with a work tool that performs the cutting operation by attaching a saw chain or the like. Further, in the case of a work tool for performing a cutting operation by attaching a saw chain or the like, there is a possibility that the blade 8 may be cut by mistake other than the material to be cut located on the opposite side of the material to be cut with respect to the saw chain or the like. Since the blade portion is formed only on the surface, it is possible to suppress erroneous cutting other than the material to be cut.

  Here, the positional relationship among the operating rod 3, the plunger 6 and the blade 8 in a state where the blade 8 is attached to the plunger 6 will be described with reference to FIGS.

  In FIG. 5, the plane B represents a plane including the operating rod 3 and the plunger 6, and the plane B and the side surface 8 </ b> A of the blade 8 are in a parallel positional relationship. In FIG. 3, the straight line A represents a straight line including the axis of the operation rod 3, and the straight line A and the blade 8 are separated from each other in a side view.

  With such a positional relationship, when the pole saver saw 1 is operated, a moment centering on the axis of the operating rod 3 can be suppressed, so that operability can be improved. In addition, the material to be cut can be captured on the axial extension line of the operation rod 3, and an intuitive operation is possible.

  Next, the operation of the pole saver saw 1 will be described.

  When the above-described stop switch 31B is switched from the stop position to the operating position and the starter handle is pulled vigorously, the internal combustion engine 2A starts driving, and a rotating shaft (not shown) rotates. Next, when the throttle 31A is pushed in the direction of the operating rod 3, the rotational speed of a rotary shaft (not shown) increases, and when the rotational speed exceeds a predetermined rotational speed, rotational force is applied to the drive shaft 34 via a centrifugal clutch (not shown). Communicated.

  When the drive shaft 34 rotates, the drive transmission shaft 51 is rotationally driven via the pinion 34A and the drive transmission gear 51A, and the inclined shaft 51B rotates around the axis of the drive transmission shaft 51.

  As shown in FIGS. 6A and 6B, when the tilt shaft 51B rotates about the axis of the drive transmission shaft 51, the reciprocating plate 52 is rotated as shown in FIG. The states of a) and FIG. 6B are repeated. As a result, the reciprocating plate 52 swings in the front-rear direction, and the swinging arm portion 52A reciprocates in the front-rear direction. Therefore, the plunger 6 connected to the swinging arm portion 52A and the blade 8 attached to the plunger 6 are also included. It is driven back and forth in the front-rear direction. That is, the reciprocating motion conversion mechanism 5 converts the rotation of the drive shaft 34 into a reciprocating motion, so that the blade 8 is reciprocated in the front-rear direction. Cutting operation is enabled by the reciprocating drive of the blade 8.

  Next, a pole saver saw 200 according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the structure same as the pole saver saw 1 by the 1st Embodiment of this invention, description is abbreviate | omitted, and a different structure is demonstrated.

  As shown in FIG. 7, a guide sleeve 201 is disposed in the gear housing 204 of the pole saver saw 200 in front of and above the drive shaft 34 so as to be swingable by a predetermined angle about the shaft bolt 202. Further, guide rails 209 are supported by the gear housing 204 on the outer sides of the guide sleeve 201 in the left-right direction. The gear housing 204 is an example of a housing of the present invention and an example of a second housing.

  The guide sleeve 201 has a substantially cylindrical shape extending in the front-rear direction, and a bearing metal 203 is press-fitted into the front inside thereof. Guide holes 201a extending in the front-rear direction are formed in the left and right side surfaces at the center of the guide sleeve 201 in the front-rear direction, and rectangular through holes 201b having a rectangular shape in side view are formed in the left and right side surfaces of the rear end portion. ing. In addition, elongated holes 201c extending in the front-rear direction are formed on both upper and lower surfaces of the guide sleeve 201. Further, the guide sleeve 201 supports a plunger 206 in the interior thereof via a bearing metal 203 so as to be slidable in the front-rear direction.

  The plunger 206 corresponding to the output shaft extends in the front-rear direction, the blade holder 7 is fixed to the front end portion thereof, and the blade 8 is detachable. Guide shafts 206A extending in the left-right direction from the left and right side surfaces of the rear portion of the plunger 206 are inserted through the guide holes 201a on the left and right side surfaces of the guide sleeve 201 and extend to the outside of the guide sleeves 201. At the end, a swing roller 206B is provided that is rotatable about the axis of the guide shaft 206A. A plunger through hole 206a extending in the front-rear direction is formed on the lower surface of the plunger 206, and a substantially circular circular hole 206b is formed on the upper surface when viewed from the top. The swing arm portion 52A of the reciprocating plate 52 passes through the elongated hole 201c and the plunger through hole 206a, and a spherical portion 252B formed at the end of the swing arm portion 52A engages with the circular hole 206b in a rollable manner. Yes.

  Behind the plunger 206, a change shaft 205 that passes through the respective rectangular through holes 201b on the left and right side surfaces of the guide sleeve 201 is supported by the gear housing 204 so as to be rotatable about its own axis. The portion of the change shaft 205 that passes through the rectangular through hole 201b has a flat plate shape having a flat portion. When the flat portion of the change shaft 205 is orthogonal to the up-down direction, the swinging operation of the guide sleeve 201 is allowed, and when it is orthogonal to the front-rear direction, the swinging operation of the guide sleeve 201 is restricted. ing. A change lever 205A connected to the change shaft 205 is provided at the rear side of the right side surface of the gear housing 204. By operating the change lever 205A, the swing operation of the guide sleeve 201 can be switched between permissible and restricted. The state in FIG. 7 is a state in which the swing operation of the guide sleeve 201 is allowed.

  The guide rail 209 corresponding to the guide member is configured by a lower rail 209B having a raceway surface 209A that can come into contact with the swing roller 206B and an upper rail 209D having a raceway surface 209C that can come into contact with the swing roller 206B. The lower rail 209B and the upper rail 209D are connected at their front end portions.

  The track surface 209A extends in the front-rear direction (reciprocating direction), and gradually inclines downward from the rear to the front. Further, the raceway surface 209C extends in the front-rear direction (reciprocating direction), and gradually inclines upward from the rear part toward the front part.

  The operation of the pole saver saw 200 according to the second embodiment of the present invention will be described with reference to FIG.

  When the internal combustion engine 2A is driven, the drive shaft 34 rotates as in the pole saver saw 1 according to the first embodiment of the present invention. The rotational force of the drive shaft 34 is transmitted to the reciprocating plate 52 via the drive transmission shaft 51 and the inclined shaft 51B, and the swing arm portion 52A swings in the front-rear direction. As the swinging arm portion 52A swings, the spherical portion 252B engaged with the inside of the circular hole 206b so as to be able to roll with a slight gap performs a reciprocating motion in the front-rear direction while rolling. The blade 8 is reciprocally driven. Cutting operation is enabled by the reciprocating drive of the blade 8.

  As shown in FIG. 8A, in a state where the blade 8 is not pressed against the workpiece X, the blade 8 and the plunger 206 are reciprocated similarly to the pole saver saw 1 according to the first embodiment of the present invention. I do. That is, only the movement in the front-rear direction is performed, and the movement in the vertical direction is not added.

  As shown in FIGS. 8B and 8C, in the state where the blade 8 is pressed against the material X to be cut, the blade 8 receives an upward reaction force F from the material X to be cut. Moves upward. Further, since the guide sleeve 201 can swing around the shaft bolt 202, the rear end portion of the guide sleeve 201 is pressed downward, and the swing roller 206B contacts the raceway surface 209A of the guide rail 209.

  Since the swing roller 206B reciprocates between the front dead center (the state shown in FIG. 8 (b)) and the rear dead center (the state shown in FIG. 8 (c)) in a state in which the swing roller 206B is in contact with the raceway surface 209A, The locus corresponding to the shape of the raceway surface 209A is drawn. In the pole saver saw 200, an arcuate locus C is drawn.

  Thus, the pole saver saw 200 is provided with an orbital mechanism for realizing so-called orbital cutting that adds a downward movement to the tip of the blade 8 when returning from the front dead center to the rear dead center. Therefore, the cutting force can be improved.

  Next, a pole saver saw 300 according to a third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same structure as the pole saver saw 1 by the 1st Embodiment of this invention, and the pole saver saw 200 by the 2nd Embodiment of this invention, description is abbreviate | omitted and it differs. The configuration will be described.

  As shown in FIG. 9, a reciprocating motion conversion mechanism 305 and a counterweight 301 are disposed in the gear housing 304 of the pole saver saw 300. The gear housing 304 is an example of a housing of the present invention and an example of a second housing.

  The reciprocating motion conversion mechanism 305 is disposed in the lower part inside the gear housing 304 and includes a drive transmission shaft 51 and a counter reciprocating plate 352.

  The drive transmission shaft 51 includes a counter tilt shaft 351B behind the tilt shaft 51B, and the counter tilt shaft 351B is configured to rotate around the axis of the drive transmission shaft 51 with the drive transmission shaft 51. . The counter reciprocating plate 352 is rotatably attached to the counter tilt shaft 351B via two ball bearings 305A that contact the counter tilt shaft 351B, and extends in a direction perpendicular to the axis of the counter tilt shaft 351B. A counter swing arm 352A is provided. A counter spherical portion 352B is provided at the tip of the counter swing arm portion 352A, and the counter spherical portion 352B is connected to the counter weight 301.

  In order to avoid interference between the swinging motion of the counter reciprocating plate 352 and the swinging motion of the reciprocating plate 52, the counter reciprocating plate 352 is inclined to the right by a predetermined angle with respect to the reciprocating plate 52 in the rear view. In addition, the inclination of the counter inclination shaft 351B with respect to the drive transmission shaft 51 is determined in consideration of the above-mentioned predetermined angle so that the swinging motion of the counter reciprocating plate 352 and the reciprocating plate 52 is in reverse phase. .

  The counterweight 301 has a substantially bowl shape that opens downward in a rear view and includes a guide sleeve 201. Further, the cross-sectional shape of the counterweight 301 is designed so that the center of gravity of the counterweight 301 and the center of gravity of the plunger 206 substantially coincide with each other in the rear view. Furthermore, in order to substantially eliminate the vibration in the axial direction of the plunger 206, it is achieved by making the product of the mass of the counterweight 301 and the reciprocating amount equal to the product of the mass of the plunger 206 and the reciprocating amount. The counterweight 301 is an example of the vibration absorbing mechanism of the present invention.

  The counterweight 301 is supported by a countershaft 302 provided in the gear housing 304 so as to be slidable in the front-rear direction. A connecting recess recessed upward is formed at the lower rear lower end of the counterweight 301, and the counter spherical portion 352B of the counter reciprocating plate 352 engages with a slight gap so that it can roll.

  The operation of the pole saver saw 300 according to the third embodiment of the present invention will be described based on FIGS. 10 (a) and 10 (b).

  When the internal combustion engine 2A is driven, the drive shaft 34 rotates as in the pole saver saw 1 according to the first embodiment of the present invention. The rotational force of the drive shaft 34 is transmitted to the reciprocating plate 52 and the counter reciprocating plate 352 via the drive transmission shaft 51, the tilt shaft 51B, and the counter tilt shaft 351B, and the swing arm portion 52A and the counter swing arm portion 352A are moved in the front-rear direction. Swing. Since the swinging arm portion 52A swings, the spherical portion 252B engaged with the inside of the circular hole 206b so as to be able to roll with a slight gap performs a reciprocating motion in the front-rear direction while rolling. 206 and the blade 8 are driven to reciprocate. Cutting operation is enabled by the reciprocating drive of the blade 8. On the other hand, when the counter swing arm 352A swings, the counter spherical portion 352B engaged with the inside of the connecting recess 301a so as to be able to roll with a slight gap reciprocates in the front-rear direction while rolling. To do so, the counterweight 301 is driven back and forth.

  As shown in FIG. 10A, when the plunger 206 is located at the rear dead center, the counterweight 301 is located at the front dead center. As shown in FIG. 10B, when the plunger 206 is located at the front dead center, the counterweight 301 is located at the rear dead center. Thus, the pole saver saw 300 is provided with a counterweight mechanism in which the plunger 206 and the counterweight 301 reciprocate in opposite phases, so that vibrations caused by the reciprocating motion of the plunger 206 are reduced. Therefore, the operability can be further improved.

  Next, a pole saver saw 400 according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as the pole saver saw 1 by the 1st Embodiment of this invention, description is abbreviate | omitted, and a different structure is demonstrated.

  As shown in FIG. 11, the pole saver saw 400 houses an electric motor 401 corresponding to a drive source in the housing 2. The electric motor 401 has a rotating shaft (not shown). When the electric motor 401 is driven, the rotating shaft (not shown) is driven to rotate. The grip 31 includes a trigger 431A and a power switch 431B.

  When the power switch 431B is turned on, the electric motor 401 starts driving, and a rotating shaft (not shown) rotates. The rotational force of the rotary shaft (not shown) is transmitted to the plunger 6 and the blade 8 via the drive shaft 34 and the reciprocating motion conversion mechanism 5, and the plunger 6 and the blade 8 are driven to reciprocate. Cutting operation can be performed by reciprocating the blade 8.

  Next, a work tool according to a fifth embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 14, a pole saver saw 601 that is a work tool according to a fifth embodiment of the present invention includes an internal combustion engine 602, an operating rod 603 having a handle 633, a gear housing 604, a plunger 606, The blade holder 607 is mainly used, and is used in a state where the blade 608 is attached to the plunger 606. In the following description, the direction in which the operating rod 603 extends with respect to the internal combustion engine 602 is defined as the front direction, and the reverse direction is defined as the rear direction. Further, the direction in which the handle 633 extends with respect to the operating rod 603 is defined as the upward direction, and the reverse direction is defined as the downward direction. Further, in FIG. 14, when the pole saver saw 601 is viewed from the rear direction, the right is defined as the right direction, and the reverse direction is defined as the left direction.

  As shown in FIG. 15, the internal combustion engine 602 is a two-cycle small engine, and includes a crankshaft 621, a magnet rotor 622, a centrifugal clutch 623, an ignition coil 624, a spark plug 625, a starter handle 626, and the like. And a fuel tank 627 and parts necessary for driving the internal combustion engine 602 such as a piston (not shown), a crank mechanism (not shown), and a carburetor (not shown). The internal combustion engine 602 corresponds to a drive source.

  The crankshaft 621 is an axis extending in the front-rear direction, and is connected to a crank mechanism (not shown) that converts a reciprocating motion of a piston (not shown) into a rotational motion. When the internal combustion engine 602 is driven, the crankshaft 621 is rotated by transmitting a driving force of a piston (not shown) via a crank mechanism (not shown).

  As shown in FIGS. 15 and 16, the magnet rotor 622 is configured in a substantially disc shape and is fixed to the front portion of the crankshaft 621 so as to rotate coaxially and integrally, and includes a magnet 622A, a magnetic pole piece 622B, Counter weight 622C. The magnet 622A is composed of a permanent magnet, and is sandwiched between a pair of magnetic pole pieces 622B slightly inside the peripheral edge of the magnet rotor 622. The counterweight 622C is provided on the opposite side of the magnet 622A with respect to the center of the magnet rotor 622, and corrects the mass distribution bias of the entire magnet rotor 622 by the magnet 622A. A power generator 628 shown in FIG. 17 is a known current generator mainly composed of a current generating coil (not shown) provided in the vicinity of the magnet rotor 622 and the magnet rotor 622. When the magnet rotor 622 of the power generation device 628 rotates and the magnet 622A passes through the vicinity of a current generating coil (not shown), the magnetic flux passing through the current generating coil changes. As a result, a voltage is induced in the current generating coil, and a current flows through a load connected to the current generating coil.

  The centrifugal clutch 623 is attached to the front side of the magnet rotor 622, and mainly includes a clutch weight 623A, a clutch drum 623B, and a clutch shaft 623C. The centrifugal clutch 623 is connected to the clutch drum 623B by moving the clutch weight 623A radially outward of the rotation center axis by centrifugal force when the rotational speed of the magnet rotor 622 exceeds a predetermined rotational speed. This is a known device in which the rotational force of the magnet rotor 622 is transmitted to the clutch drum 623B, and the clutch shaft 623C provided in the front center of the clutch drum 623B and extending in the front-rear direction is rotationally driven.

  As shown in FIGS. 15 to 17A and 17B, the ignition coil 624 is provided above the magnet rotor 622, and has a primary winding 624A and a secondary winding 624B inside. Yes. Primary winding 624A is connected to a current generating coil (not shown) of power generation device 628, and secondary winding 624B is connected to spark plug 625. A current generated by a current generating coil (not shown) flows in the primary winding 624A, and a high voltage is induced in the secondary winding 624B by the mutual induction action, and the spark plug 625 is activated to ignite. The spark plug 625 is provided in the upper part of the internal combustion engine 602. The spark plug 625 ignites once every rotation of the magnet rotor 622 and pushes down a piston (not shown). The ignition coil 624 is an example of the ignition coil of the present invention.

  The starter handle 626 is provided on the left side of the rear end of the internal combustion engine 602 and is connected to one end of a rope (not shown). The other end of the rope is wound around a reel (not shown) that can be connected to the crankshaft 621 via a clutch. When the user pulls the starter handle 626, the reel rotates in accordance with the amount of the rope that is pulled out. The magnet rotor 622 can be rotated together with the shaft 621. The fuel tank 627 is provided in the lower part of the internal combustion engine 602, and contains fuel for driving the internal combustion engine 602.

  As shown in FIGS. 14 and 15, the operating rod 603 is a long cylindrical member extending in the front-rear direction, and is connected to the front portion of the internal combustion engine 602, in other words, the operating rod 603 has one end side thereof. The internal combustion engine 602 is supported on the (rear end side), and the length in the front-rear direction is designed to be about 1 to 4 m. The operating rod 603 includes a grip 631, a hanger 632, and a handle 633, and a drive shaft 634 is disposed therein.

  The grip 631 is a part that the user grips, and is provided at the rear part of the operation rod 603. The grip 631 includes a throttle 631A, a stop switch 631B, a machine-side terminal block 631C, and a ground-side terminal block 631D.

  The throttle 631A is provided below the grip 631, and is connected to a carburetor (not shown) via a wire 631E. The throttle 631A can adjust the fuel injection amount by changing the amount pushed upward.

  As shown in FIGS. 15 and 17, the machine-side terminal block 631 </ b> C and the ground-side terminal block 631 </ b> D are provided inside the grip 631. The machine-side terminal block 631C is connected between the ignition coil 624 and the power generator 628 by a connection line 631H. On the other hand, the ground side terminal block 631D is connected to the body ground of the internal combustion engine 602 by a connection line 631I.

  The stop switch 631B is a switch that can be switched between an operation position and a stop position. The stop switch 631B includes connection points 631a and 631b that are provided on the upper front side of the grip 631 and can be connected to each other. The connection point 631a of the stop switch 631B is connected to the machine-side terminal block 631C by a connection line 631F, and the connection point 631a between the ignition coil 624 and the power generator 628 is connected to the connection line 631F, the machine-side terminal block 631C, and The connection is made via the connection line 631H. On the other hand, the connection point 631b of the stop switch 631B is connected to the ground side terminal block 631D by the connection line 631G, and the body ground of the internal combustion engine 602 and the connection point 631b are connected to the connection line 631G, the ground side terminal block 631D, and the connection line. 631I is connected.

  Further, when the stop switch 631B is switched to the stop position, the connection point 631a and the connection point 631b are electrically connected, and there is a connection line 631H between the ignition coil 624 and the power generator 628, the machine side. The terminal block 631C, the connection line 631F, the stop switch 631B, the connection line 631G, the ground side terminal block 631D, and the connection line 631I are electrically connected to the body ground. When the stop switch 631B is switched to the operating position, the connection point 631a and the connection point 631b are electrically disconnected, and the ignition coil 624 and the power generator 628 are not electrically connected to the body ground. Connected.

  As shown in FIG. 14, the hanger 632 is a portion to which a shoulder band (not shown) is attached, and is provided in front of the grip 631. With the shoulder band attached to the hanger 632, the user uses the pole saver saw 601 with the shoulder band on the shoulder.

  The handle 633 is a so-called loop handle that is provided in front of the hanger 632 and has a ring shape when viewed from the front, and includes a gripping portion 633A and a connecting portion 633B. The grip portion 633A is a portion that is gripped by the other hand when the user grips the grip 631, and has a bar shape extending in the left-right direction, and is positioned above the operation rod 603. The connection portion 633B connects the left and right end portions of the grip portion 633A and the both side surfaces of the operating rod 603, respectively. The user uses the pole saver saw 601 in a state where the shoulder band is hung on the shoulder, the grip 631 is gripped by one hand, and the gripping portion 633A is gripped at the approximate center in the left-right direction.

  As shown in FIG. 18, the drive shaft 634 is a shaft extending in the front-rear direction from the gear housing 604 through the inside of the operation rod 603 to the internal combustion engine 602, and the rear end portion is connected to the clutch shaft 623 </ b> C of the centrifugal clutch 623. The front end is connected to the reciprocating motion conversion mechanism 605. The drive shaft 634 is configured to rotate with the clutch shaft 623C. The drive shaft 634 is rotatably supported by a ball bearing 604A in the gear housing 604 and a ball bearing (not shown) in the operation rod 603, and a pinion 634A is provided at the front end of the drive shaft 634. Yes.

  The gear housing 604 is connected to the front end portion of the operation rod 603, and a reciprocating motion conversion mechanism 605 and a plunger 606 are mainly accommodated therein. In other words, the gear housing 604 is supported by the operation rod 603 on the other end side (front end side) of the operation rod 603. The gear housing 604 corresponds to a housing.

  The reciprocating motion conversion mechanism 605 is disposed on the lower side inside the gear housing 604 and includes a drive transmission shaft 651 and a reciprocating plate 652 as a swinging portion.

  The drive transmission shaft 651 extends in the front-rear direction substantially parallel to the drive shaft 634, is positioned in front of and below the drive shaft 634, and is rotatably supported by the ball bearing 604B and the ball bearing 604C supported by the gear housing 604. Has been. The drive transmission shaft 651 includes a drive transmission gear 651A and an inclined shaft 651B.

  The drive transmission gear 651A is coaxially fixed to the rear part of the drive transmission shaft 651 and meshes with the pinion 634A of the drive shaft 634. The rotational force of the drive shaft 634 is transmitted to the drive transmission shaft 651 via the pinion 634A and the drive transmission gear 651A.

  The tilt shaft 651B is provided on the drive transmission shaft 651 in a state where the axis of the tilt shaft 651B is tilted with respect to the axis of the drive transmission shaft 651. The inclined shaft 651B is configured to rotate with the drive transmission shaft 651 around the axis of the drive transmission shaft 651.

  The reciprocating plate 652 is rotatably attached to the inclined shaft 651B via two ball bearings 605A that abut against the inclined shaft 651B and extends in a direction substantially perpendicular to the axis of the inclined shaft 651B. A portion 652A is provided. The distal end portion of the swing arm portion 652 </ b> A is connected to the plunger 606.

  The plunger 606 has a substantially cylindrical shape extending in the front-rear direction, is located in front of and above the drive shaft 634, and has a positional relationship substantially parallel to the drive shaft 634. The plunger 606 is supported by the gear housing 604 so as to be slidable back and forth in the front-rear direction via a metal bearing 604D. Further, the plunger 606 is formed with an insertion hole 606a and a blade attachment portion 661. The plunger 606 corresponds to an output shaft.

  The insertion hole 606a is formed in a substantially circular shape when viewed from the bottom on the lower rear side of the plunger 606, and a part of the swing arm portion 652A of the reciprocating plate 652 is inserted therethrough. In a state in which a part of the swing arm portion 652A is inserted, the distal end portion of the swing arm portion 652A is rotatably connected to the plunger 606 by a connector pin 606A penetrating the rear portion of the plunger 606 left and right.

  As shown in FIGS. 19 and 20, the blade attachment portion 661 is formed at the front end portion of the plunger 606, and has a slit 661a, a fastening hole 661b, a pin insertion hole portion 661c, and a through hole 661e. The slit 661a is a hole penetrating in the vertical direction extending rearward from the front end surface of the blade mounting portion 661, and is configured such that the rear end portion of the blade 608 can be inserted. The fastening hole 661b is a hole that is formed in the left-right direction and is formed behind the slit 661a, and allows a fastening member 607A described later to pass therethrough. The pin insertion hole 661c is a circular hole in a side view that penetrates from the front left side of the blade mounting portion 661 to the slit 661a, and has a reduced-diameter hole portion 661d having a small hole diameter in the vicinity of the slit 661a. doing. Further, a stepped portion 661A is formed on the outer side in the radial direction of the reduced diameter hole portion 661d. The through hole 661e is a hole that penetrates from the right side surface of the blade mounting portion 661 to the slit 661a, and is opposed to the reduced diameter hole portion 661d, and the push button 673A of the micro switch 673 described later protrudes to the left. Allowed.

  The blade holder 607 is fixed to the blade mounting portion 661 by a fastening member 607A, and includes a locking pin 671, a knob 672, a micro switch 673, and a holder case 674. The blade 608 attached to the plunger 606 extends in the front-rear direction and includes a blade portion for cutting the material to be cut at the front lower end portion. The vertical length of the rear portion of the blade 608 inserted into the slit 661a of the blade mounting portion 661 is substantially the same as the vertical length of the blade mounting portion 661. The thickness of the blade 608 is about 0.9 to 1.6 mm, and a circular locking hole 608a is formed in the rear part thereof in a side view penetrating in the left-right direction. The blade holder 607 corresponds to a tool fixing mechanism, and the blade 608 corresponds to a tip tool.

  The locking pin 671 includes a first cylindrical portion 671A, a second cylindrical portion 671B, and a conical portion 671C. The first cylindrical portion 671A has a cylindrical shape extending in the left-right direction, and the length in the left-right direction is designed to be shorter than the width in the left-right direction of the slit 661a. The first cylindrical portion 671A is inserted through the locking hole 608a of the blade 608, and the blade 608 moves in the front-rear direction with respect to the blade mounting portion 661 by inserting the first cylindrical portion 671A into the locking hole 608a. Movement is regulated. The second cylindrical portion 671B has a cylindrical shape having a diameter larger than the diameter of the first cylindrical portion 671A, and the diameter is configured to be slightly smaller than the diameter of the reduced diameter hole portion 661d. The conical portion 671C has a shape in which a conical shape is connected to a cylindrical shape, and the cylindrical portion has a diameter that is larger than the diameter of the second cylindrical portion 671B and slightly smaller than the diameter of the pin insertion hole portion 661c. Have. A spring 607B is provided radially outward of the second cylindrical portion 671B, one end in the left-right direction abuts on the conical portion 671C, and the other end contacts the stepped portion 661A of the pin insertion hole 661c. It touches. The spring 607B biases the locking pin 671 in a direction (left direction) in which the fixing (regulation) of the blade 608 with respect to the blade mounting portion 661 is released. The locking pin 671 corresponds to a locking member.

  The knob 672 includes a spring accommodating portion 672A, an arm portion 672B, a protruding portion 672C, and a fixing release lever 672D. The spring accommodating portion 672A has a substantially circular shape when viewed from the side, a coil spring 672E is accommodated therein, and a fastening hole 672a that allows the fastening member 607A to pass therethrough is formed on the left side. The arm portion 672B extends forward from the upper front portion of the spring accommodating portion 672A, and the surface facing the pin insertion hole portion 661c of the blade mounting portion 661 is inclined to the left as it goes upward from below. A surface 672F is defined. The inclined surface 672F is in contact with the conical portion 671C of the locking pin 671 and restricts the locking pin 671 from moving to the left than the state of FIG. 20 by the urging force of the spring 607B. The coil spring 672E biases the arm portion 672B upward. That is, the coil spring 672E holds the state where the arm portion 672B restricts the movement of the locking pin 671 in the left direction (the state shown in FIG. 20). The protruding portion 672C protrudes leftward from the front left side surface of the arm portion 672B, and a fixing release lever 672D is provided at the left end portion thereof. The knob 672 corresponds to an operation unit.

  As shown in FIGS. 17 and 20, the microswitch 673 is a switch mechanism having a substantially rectangular parallelepiped shape provided on the right side of the blade mounting portion 661, and includes a push button 673A, and internally includes connection points 673a and 673b. Have. The push button 673A is provided on the front left side surface of the micro switch 673 and protrudes leftward through a through hole 661e from a position facing the right end surface of the first cylindrical portion 671A of the locking pin 671. Yes. Further, the push button 673A has a state in which the first cylindrical portion 671A of the locking pin 671 is inserted into the locking hole 608a of the blade 608 and the blade 608 is fixed to the blade mounting portion 661 (state of FIG. 20). It is pressed by the locking pin 671. The micro switch 673 corresponds to a fixing mechanism detection unit, a stopping unit, and a switch mechanism. The push button 673A corresponds to a button.

  As shown in FIGS. 17, 20, and 22, the connection points 673a and 673b are configured to be connectable to each other, the connection point 673a is connected to the machine-side terminal block 631C by a connection line 631J, and the connection point 673b is The connection line 631K is connected to the ground side terminal block 631D. Further, when the push button 673A is pressed by the locking pin 671 (the state shown in FIG. 20), the connection points 673a and 673b are not connected to each other (the state shown in FIG. 17A). When not pressed by the locking pin 671 (the state shown in FIG. 22), they are connected to each other (the state shown in FIG. 17B). The position of the locking pin 671 in the state where the locking pin 671 is pressing the push button 673A (the state of FIG. 20) is an example of the first position of the present invention. Further, the position of the locking pin 671 in a state where the locking pin 671 does not press the push button 673A (the state of FIG. 22) is an example of the second position of the present invention.

  When the push button 673A is not pressed by the locking pin 671, the connection point 673a and the connection point 673b are in an electrically connected state. Therefore, a connection line is provided between the ignition coil 624 and the power generator 628. 631H, the machine side terminal block 631C, the connection line 631J, the micro switch 673, the connection line 631K, the ground side terminal block 631D, and the connection line 631I are electrically connected to the body ground. When the push button 673A is pressed by the locking pin 671, the connection point 673a and the connection point 673b are electrically disconnected, so that the body ground is between the ignition coil 624 and the power generator 628. And electrically disconnected.

  The holder case 674 is formed so as to cover the entire blade mounting portion 661 and the micro switch 673, and a portion facing the slit 661a on the front end surface opens in the vertical direction. Further, in a state where the rear portion of the blade 608 is inserted into the slit 661a of the blade attachment portion 661, the upper inner side of the holder case 674 is in contact with the upper end surface of the rear portion of the blade 608, and the lower inner side of the holder case 674 is By abutting, the movement of the blade 608 in the vertical direction with respect to the blade mounting portion 661 is restricted. Further, a portion of the blade 608 facing the protrusion 672C of the knob 672 is formed with a hole that allows the protrusion 672C to protrude leftward and allows the protrusion 672C to move downward by a predetermined distance. . A through hole 674a that allows the fastening member 607A to pass therethrough is formed in the rear portion of the right side surface of the holder case 674.

  As described above, in a state where the rear portion of the blade 608 is inserted into the slit 661a of the blade mounting portion 661 and the locking pin 671 is inserted into the locking hole 608a of the blade 608, the blade 608 moves in the front-rear direction with respect to the blade mounting portion 661. The movement in the vertical direction is restricted, and the blade 608 is fixed to the blade mounting portion 661.

  19 and 20, the blade 608 is attached to the blade attachment portion 661. However, the locking pin 671 is moved along the inclined surface 672F by the urging force of the spring 607B by pushing the knob 672 downward. Moving to the left direction, the first cylindrical portion 671A comes out of the locking hole 608a, and the fixing of the blade 608 to the blade mounting portion 661 is released. As described above, the blade 608 can be detached from the blade mounting portion 661 only by pressing the knob 672 downward.

  As shown in FIGS. 21 and 22, in a state where the blade 608 is not fixed to the blade mounting portion 661, the locking pin 671 moves to the left along the inclined surface 672F. The push button 673A of 673 is not pressed.

  When it is desired to attach the blade 608 to the blade attachment portion 661 again, the rear portion of the blade 608 is inserted into the slit 661a with the knob 672 pushed downward to move the locking pin 671 to the left, Release. When the hand is released, the knob 672 biased upward by the coil spring 672E moves upward. As the knob 672 moves upward, the locking pin 671 moves rightward along the inclined surface 672F, so that the first cylindrical portion 671A is inserted into the locking hole 608a of the blade 608, and the push button of the micro switch 673 673A is pressed by the first cylindrical portion 671A, and the blade 608 is fixed to the blade mounting portion 661.

  As described above, the blade 608 can be attached to and detached from the plunger 606 without using a tool with a simple procedure of operating the knob 672 of the blade holder 607 only in a single direction, so-called one-touch. The operation of the micro switch 673 is such that the push button 673A of the micro switch 673 is not pressed by the locking pin 671 when the knob 672 is operated downward and the blade 608 is not fixed to the blade mounting portion 661. Thus, the connection point 673a and the connection point 673b are in a connected state (the state shown in FIG. 17B). On the other hand, when the blade 608 is fixed to the blade mounting portion 661, the push button 673A of the micro switch 673 is pressed by the locking pin 671, and the connection point 673a and the connection point 673b are not connected. (State of FIG. 17A).

  Next, the operation of the pole saver saw 601 will be described together with the internal electrical connection.

  First, in a state where the blade 608 is fixed to the blade attachment portion 661, the stop switch 631B is switched from the stop position to the operation position. The electrical connection inside the pole saver saw 601 in this state is as shown in FIG. 17A, and the ignition coil 624 and the power generator 628 are not electrically connected to the body ground. Yes. Arrows J, K, and L shown in FIG. 17 indicate the direction of current flow in each state.

  In this state, when the starter handle 626 is pulled, the magnet rotor 622 rotates in the direction of arrow R shown in FIG. As the magnet rotor 622 rotates, the power generator 628 generates a current, and a current (arrow J) flows through the primary winding 624A of the ignition coil 624. When a current flows through the primary winding 624A, a high voltage is induced in the secondary winding 624B due to mutual induction, and a current (arrow K) flows through the spark plug 625 connected to the secondary winding 624B. Is activated and ignited.

  When the ignition plug 625 is ignited, a piston (not shown) starts to reciprocate, and at the same time, the crankshaft 621 driven by the piston reciprocation (not shown) is rotationally driven. When the crankshaft 621 starts to rotate, the magnet rotor 622 coaxially fixed also rotates, and the spark plug 625 is ignited. Thus, the internal combustion engine 602 is continuously driven in synchronism with the operation of a piston (not shown) and the ignition timing of the spark plug 625.

  When the internal combustion engine 602 starts driving, the crankshaft 621 is rotationally driven at a low rotational speed and enters an idling state. When the throttle 631A is pushed upward in the idling state, the rotational speed of the crankshaft 621 increases. When the rotational speed exceeds the predetermined rotational speed, the clutch weight 623A of the centrifugal clutch 623 is connected to the clutch drum 623B. A clutch shaft 623C provided on the clutch drum 623B is rotationally driven.

  When the clutch shaft 623C is rotationally driven, the drive shaft 634 connected to the clutch shaft 623C is rotationally driven. As the drive shaft 634 rotates, the drive transmission shaft 651 is rotationally driven via the pinion 634A and the drive transmission gear 651A, and the inclined shaft 651B rotates around the axis of the drive transmission shaft 651.

  As the inclined shaft 651B rotates about the axis of the drive transmission shaft 651, the reciprocating plate 652 swings back and forth to reciprocate, and the plunger 606 and the plunger 606 connected to the swing arm portion 652A The attached blade 608 is also driven to reciprocate in the front-rear direction. Cutting operation is enabled by the reciprocating drive of the blade 608.

  Next, a case where the blade 608 is attached and detached in the idling state will be described.

  When performing attachment / detachment during work, the user releases the throttle 631A to reduce the rotation speed of the crankshaft 621, cuts off the connection between the clutch weight 623A of the centrifugal clutch 623 and the clutch drum 623B, and moves the plunger 606 and the blade 608. Is stopped, and an idling state is established.

  In the idling state, when the user pushes down the knob 672 of the blade holder 607 to release the blade 608 from the plunger 606, the locking pin 671 moves to the left, and the micro switch 673 The push button 673A is not pressed. When the push button 673A is not pressed, the connection point 673a and the connection point 673b of the micro switch 673 are electrically connected, and the state shown in FIG. 17B is established, and the ignition coil 624 and the power generation device 628 are connected. The space is electrically connected to the body ground.

  When the ignition coil 624 and the power generation device 628 are electrically connected to the body ground, the current generated by the power generation device 628 every time the magnet rotor 622 rotates once passes through the microswitch 673. It flows into the body ground (arrow L) and does not flow into the primary winding 624A of the ignition coil 624. Since no current flows into the primary winding 624A, no high voltage is generated in the secondary winding 624B, and the ignition plug 625 is not ignited, the piston (not shown) is stopped, and the driving of the internal combustion engine 602 is also stopped. To do.

  Note that when the starter handle 626 is pulled while the connection point 673a and the connection point 673b of the micro switch 673 are connected, the current flow is the same as the above-described flow (arrow L), so the internal combustion engine 602 is driven. Not. The internal combustion engine 602 is not driven even when the starter handle 626 is pulled while the stop switch 631B is in the stop position. In this case, the current generated by the power generator 628 flows into the body ground via the stop switch 631B. become.

  Therefore, in the pole saver saw 601 according to the fifth embodiment of the present invention, the connection point 673a and the connection point 673b are in a disconnected state, and the connection point 631a and the connection point 631b are in a disconnected state. In other words, the internal combustion engine 602 can be driven only when the push button 673A of the micro switch 673 is pressed and the stop switch 631B is in the operating position.

  As described above, when the micro switch 673 that detects that the blade 608 is released from being fixed (release operation) by the blade holder 607 detects that the blade 608 is released, the connection inside the micro switch 673 is performed. Since the point connection state is switched to stop the driving of the internal combustion engine 602, it is possible to prevent the plunger 606 from being unexpectedly driven when the user attaches / detaches the blade 608, and the smooth attachment / detachment of the blade 608 is prevented. Realized and improved convenience.

  The gear housing 604 is provided with a reciprocating motion conversion mechanism 605 that converts the rotational force of the drive shaft 634 into a reciprocating motion. The plunger 606 is reciprocated by the rotational force of the drive shaft 634 via the reciprocating motion converting mechanism 605. Therefore, the cutting operation or the like can be performed by driving the plunger 606 back and forth.

  Further, the blade holder 607 has a knob 672 for releasing the fixing of the blade 608, and the micro switch 673 is configured to detect that the fixing of the blade 608 is released when the knob 672 is operated. Therefore, it can be reliably detected that the user is attaching and detaching the blade 608, the detection accuracy can be improved, and convenience is further improved.

  Further, the blade holder 607 has a locking pin 671 for fixing the blade 608 to the plunger 606. The locking pin 671 fixes the blade 608 to the plunger 606 in the state of FIG. The micro switch 673 is configured to detect that the fixing of the blade 608 is released by the position of the locking pin 671, and thus the blade 608 is directly connected to the plunger 606. It is possible to detect that the blade 608 is being attached / detached based on the position of the locking pin 671 that is fixed to the blade. For this reason, detection accuracy can be improved more.

  Further, the micro switch 673 can switch connection / disconnection between the connection point 673a and the connection point 673b, and the locking pin 671 is pressed in the state of FIG. 20, and the locking pin 671 is in the state of FIG. The push button 673A is not pressed and the push button 673A is not pressed by the locking pin 671, so that it is detected that the fixing of the blade 608 is released. With this configuration, it is possible to accurately detect that the blade 608 has been released.

  The internal combustion engine 602 includes an ignition coil 624 having a primary winding 624A and a secondary winding 624B, and a power generator 628 for supplying current to the primary winding 624A, and a connection point of the microswitch 673. 673a is connected between the primary winding 624A and the power generator 628, the connection point 673b is connected to the body ground, and the microswitch 673 is in a state where the push button 673A is pressed by the locking pin 671. By disconnecting the primary winding 624A and the ground, the current generated by the power generation device 628 flows to the primary winding 624A to allow the internal combustion engine 602 to be driven, and the push button 673A is a locking pin. In a state in which the power generator 628 is not pressed by the 671, the power generator 628 is activated by connecting the primary winding 624A and the ground. The push button 673A of the micro switch 673 is not pressed because the generated current is supplied to the ground, and the supply of the current to the primary winding 624A is interrupted to stop the driving of the internal combustion engine 602. In this case, that is, when the user attaches / detaches the blade 608 and the blade 608 is not fixed to the plunger 606, no current flows from the power generator 628 to the primary winding 624A. Therefore, no voltage is induced in the secondary winding 624B. In other words, the ignition coil 624 does not operate and the spark plug 625 does not operate. Therefore, the internal combustion engine 602 is in a stopped state (the stopped state is maintained), and it is possible to reliably prevent the plunger 606 from being driven unintentionally when the user attaches / detaches the blade 608, and the convenience is further improved. .

  According to such a configuration, when the button of the switch mechanism is not pressed, that is, when the user attaches / detaches the tip tool and the tip tool is not fixed to the output shaft, no current flows to the electric motor. . For this reason, it is possible to reliably prevent the output shaft from being driven unintentionally when the user is attaching and detaching the tip tool, and the convenience is further improved.

  The work tool according to the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the invention described in the claims. For example, the track surface of the pole saver saw 200 may have a wave shape.

  The counter weight mechanism provided in the pole saver saw 300 has a configuration in which the counter weight 301 is driven by the drive transmission shaft 51. However, the counter weight is connected to a leaf spring or the like and disposed at the rear portion of the plunger. The counterweight mechanism may be used.

  The pole saver saw 601 is an electric motor connected to a power source through a micro switch 673. The micro switch 673 is connected to the power source in a state where the push button 673A is pressed by the locking pin 671. In the state where the electric motor is allowed to be driven and the electric motor is driven and the push button 673A is not pressed by the locking pin 671, the electric power supply from the power source to the electric motor is cut off. You may be comprised so that the drive of a motor may be stopped. Specifically, the internal combustion engine 602 of the pole saver saw 601 is changed to an electric motor and a power source, the stop switch 631B is changed to a power switch, and a micro switch 673 and a power switch are provided in series between the electric motor and the power source. The connection point 673a of the micro switch 673 is connected to the electric motor, the connection point 673b is connected to one end of the power switch, and the other end of the power switch is connected to the power source. A configuration in which the connection points 673a and 673b are disconnected when the push button 673A is not pressed is conceivable. With such a configuration, when the user attaches / detaches the blade 608 and the blade 608 is not fixed to the plunger 606, no current flows to the electric motor. Thereby, when the user is attaching and detaching the blade 608, it is possible to reliably prevent the plunger 606 from being driven unintentionally, and the convenience is further improved.

  Further, for example, the micro switch 673 is disposed below the knob 672, and the push button 673A is pressed by the downward movement of the knob 672, and the internal combustion engine 602 is in a state where the push button 673A is pressed. May be configured to be stopped. Thus, it is desirable that the connection / disconnection state of the connection points 673a and 673b based on the arrangement position of the micro switch 673 and the pressing state of the push button 673A is appropriately determined.

1, 200, 300, 400 ·· Pole saver saw 2 · · Housing 3 · Operation rod 4, 204, 304 · · Gear housing 5, 305 · · Reciprocating conversion mechanism 6, 206 · · Plunger 6A · · Connector pin 6a ·· Insertion hole 7 · · Blade holder 7A · · Fastening member 7B · · Spring 8 · · Blade 8A · · Side 8a · · Locking hole 21 · · Fuel tank 22 · · Starter handle 31 · · Handle 31 · · · Grip 31A ·· Throttle 31B ·· Stop switch 32 · Hanger 33 ·· Handle 33A ·· Grip 34 ·· Drive shaft 51 ·· Drive transmission shaft 51B ·· Inclined shaft 52 ·· Reciprocating plate 52A ·· Oscillating arm Part 61 ·· Blade mounting part 61A · · Stepped part 61a · · Slit 61b · · Mounting hole 61c · · Pin insertion hole 61d · · Diameter hole 71 ··· Locking pin 71A ··· First cylindrical portion 71B · · · Second cylindrical portion 71C · · Conical portion 71F · · Inclined surface 72 · · Knob 72A · · · Spring accommodating portion 72A · · · Spring accommodating portion 72B .. Arm part 72C .. Projection part 72D .. Operation part 72E .. Coil spring 72F .. Inclined part 72a .. Through hole 73 .. Holder case 73a ・ Through hole 201 ・ Guide sleeve 201a ・ Guide hole 201b ・・ Square through hole 201c ・ ・ Long hole 202 ・ ・ Shaft bolt 205 ・ ・ Change shaft 205A ・ ・ Change lever 206A ・ ・ Guide shaft 206B ・ ・ Swing roller 206a ・ ・ Plunger through hole 206b ・ ・ Circular hole 209 ・ ・ Guide rail 209A, 209C ··· Track surface 252B · · Spherical portion 301 · · Counterweight 301a · · Connection recess 02 ··· Counter shaft 351B ··· Counter tilt axis 352 · · Counter reciprocating plate 352A · · Counter swing arm portion 352B · · Counter spherical portion 401 · · Electric motor 431A · · Trigger 431B · · Power switch 500 · · Pole saw 501・ ・ Operation rod 502 ・ ・ Engine 503 ・ ・ Gear case 504 ・ ・ Saw chain A ・ ・ Straight line B ・ ・ Plane C ・ ・ Trace F ・ ・ Reaction force W ・ ・ Cut material X ・ ・ Cut material 601 ・ ・ Pole saver Saw 602 ... Internal combustion engine 603 Operation rod 604 Gear housing 605 Reciprocating conversion mechanism 606 Plunger 607 Blade holder 608 Blade 621 Crankshaft 622 Magnet rotor 622A Magnet 623 ... Centrifugal clutch 623A ...・ Cutch drum 623C ・ ・ Clutch shaft 624 ・ ・ Ignition coil 624A ・ ・ Primary winding 624B ・ ・ Secondary winding 625 ・ ・ Spark plug 626 ・ ・ Starter handle 627 ・ ・ Fuel tank 628 ・ ・ Power generator 631A ··· Throttle 631B · · Stop switch 631C · · Machine side terminal block 631D · · Earth side terminal block 632B · · Stop switch 634 · · Drive shaft 651 · · Drive transmission shaft 651A · · Drive transmission gear 651B · · Inclined shaft 652 ... Reciprocating plate 652A ... Swing arm 661 ... Blade mounting part 671 ... Locking pin 672 ... Knob 672D ... Fixed release lever 672F ... Inclined surface 673 ... Micro switch 673A ... Push button 673a ..Connection point 673b Point 674 ... holder case

Claims (7)

A driving source;
A drive shaft that is rotationally driven by the drive source being driven;
A reciprocating motion conversion mechanism for converting the rotational force of the drive shaft into a reciprocating motion;
An output shaft connected to the reciprocating motion conversion mechanism and driven to reciprocate by the rotational force of the drive shaft via the reciprocating motion conversion mechanism;
A tool fixing mechanism provided on the output shaft and fixing a tip tool to the output shaft;
A fixing mechanism detector for detecting the state of the tool fixing mechanism;
A work tool, comprising: a stopping means for stopping driving of the drive source when the fixing mechanism detection unit detects a release operation. The tool fixing mechanism has an operation unit for releasing the fixing of the tip tool,
The work tool according to claim 1 , wherein the fixing mechanism detection unit is configured to detect that the fixing of the tip tool is released by operating the operation unit. The tool fixing mechanism has a locking member for fixing the tip tool to the output shaft,
The locking member fixes the tip tool to the output shaft at a first position, and releases the fixing of the tip tool to the output shaft at a second position;
The fixing mechanism detecting unit tool as defined in claim 1 or 2, characterized in that it is configured to detect that the fixing of the tip tool is released by the position of the engaging member. The stopping means has a switch mechanism,
The fixing mechanism detection unit is pressed by the locking member when the locking member is at the first position, and the locking member when the locking member is at the second position. A button that is not pressed by the locking member, and is configured to detect that the tip tool is released when the button is not pressed by the locking member. The work tool according to claim 3 . The drive source is an engine including an ignition coil having a primary winding and a secondary winding, and a power generation device that supplies current to the primary winding,
The stopping means is
One end is connected between the primary winding and the power generator, and the other end is connected to the ground,
In a state in which the release mechanism detection unit does not detect that the release operation has been performed, the primary winding and the ground are disconnected from each other, so that the current generated by the power generator is disconnected from the primary winding. To allow the engine to drive,
In a state where it is detected that the fixing mechanism detection unit has been released, the primary winding and the ground are brought into a connected state so that the current generated by the power generator flows to the ground, and the primary winding cut off the supply of current to the line, the work tool according to claim 1 or 2, characterized in that it is configured to stop the drive of the engine. The drive source is an electric motor connected to a power source via the stop means,
The stopping means is
In a state where the fixing mechanism detection unit has not detected that the release operation has been performed, the power supply from the power source to the electric motor is permitted, and the driving of the electric motor is permitted,
In a state where the fixing mechanism detection unit detects that the release operation has been performed, the power supply from the power source to the electric motor is cut off, and the drive of the electric motor is stopped or maintained in a stopped state. and working tool according to claim 1 or 2, characterized in that are. A driving source;
A drive shaft having one end connected to the drive source and driven to rotate by driving the drive source;
A housing covering the other end of the drive shaft;
A long operation rod that supports the drive source on one end side, supports the casing on the other end side, and disposes the drive shaft therein.
An output shaft provided in the housing and driven by the rotational force of the drive shaft;
A tool fixing mechanism provided on the output shaft and fixing a tip tool to the output shaft;
A fixing mechanism detector for detecting the state of the tool fixing mechanism;
A work tool, comprising: a stopping means for stopping the drive of the drive source when it is detected that the fixing mechanism detection unit is released.

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