Reciprocating motion cutting tool

Abstract

A reciprocating cutting tool is provided. A reciprocating saw as the reciprocating cutting tool has a reciprocating motion conversion mechanism (5) driven by a motor, a rod-shaped slide (6) connected to the reciprocating motion conversion mechanism and performing a reciprocating motion, a blade holding portion (138) held at a front end of the slide and holding a blade, a power transmission housing (20) housing the reciprocating motion conversion mechanism with the slide protruding from a front end thereof, a cover (22) arranged outside the power transmission housing, and a fan rotatable integrally with a rotor of the motor. A first passage (exhaust air (W1)) of cooling air of the fan is provided between the power transmission housing and the cover, and the first passage branches into a second passage (192) (exhaust air (W2)) toward the blade holding portion side and a third passage (193) (exhaust air (W3)) not toward the blade holding portion side. Accordingly, dust flying can be suppressed.

Description

Technical Field

[0001] This invention relates to a rechargeable reciprocating saw and other reciprocating motion cutting tools. Background Technology

[0002] In paragraph

[0020] of Japanese Patent Publication No. 4554982 (Patent Document 1), a reciprocating saw with a sliding member equipped with a saw blade performing trajectory motion during reciprocating motion is disclosed.

[0003] In paragraph

[0016] of Japanese Patent Publication No. 4554982, a reciprocating saw in which cooling air is discharged forward along a slider is disclosed.

[0004] [Existing Technical Documents]

[0005] [Patent Literature]

[0006] Patent Document 1: Japanese Invention Patent Publication No. 4554982 Summary of the Invention

[0007] [The technical problem the invention aims to solve]

[0008] In reciprocating cutting tools, there is a need for a technique that can switch between at least one of the presence or absence of trajectory motion and the degree of trajectory motion in a stable state.

[0009] In addition, a technology is needed to suppress dust (chips) from flying in reciprocating cutting tools.

[0010] [Technical solutions used to solve technical problems]

[0011] This specification discloses a reciprocating motion tool according to the first disclosed example. This reciprocating motion tool may include: a motor; a rod-shaped slider; a reciprocating motion conversion mechanism that converts the rotation of the motor into a reciprocating motion in the forward and backward direction, and transmits it to the slider, with the extension direction of the slider as the forward and backward direction; a tip tool holder disposed at the front end of the slider, capable of mounting a tip tool having an action portion acting on a workpiece in at least one of a lower or upper side of the action portion; a trajectory mechanism that, accompanying the reciprocating motion of the slider, causes the tip tool holder to perform a trajectory movement in the up-down direction; and a trajectory switching mechanism that switches between a trajectory state involving at least one of the presence or absence of trajectory movement performed by the trajectory mechanism and the degree of trajectory movement performed by the trajectory mechanism. The trajectory switching mechanism may include a shaft-like portion extending in the left-right direction. The shaft-like portion may have a support surface capable of directly or indirectly supporting the slider. The support surface may have a first portion, which is a portion of the shaft-like portion forward of an imaginary central axis in the left-right direction. Additionally, the support surface may have a second portion, which is a portion located rearward from the central axis.

[0012] Furthermore, this specification discloses a reciprocating tool according to the second disclosed example. This reciprocating tool may include: a motor having a stator and a rotor; a reciprocating motion conversion mechanism driven by the motor; a rod-shaped slider connected to the reciprocating motion conversion mechanism and reciprocating; and a tip tool holder held at the front end of the slider and holding the tip tool. A power transmission housing may be provided, which houses the reciprocating motion conversion mechanism, and the slider protrudes from the front end. A cover may be provided on the outside of the power transmission housing. A fan capable of rotating integrally with the rotor may be provided. A first channel for cooling air from the fan may be provided between the power transmission housing and the cover. The first channel may branch into a second channel facing the tip tool holder and a third channel not facing the tip tool holder.

[0013] [Invention Effects]

[0014] The reciprocating motion tool, as disclosed in the first example, is capable of switching between at least one of the presence or absence of trajectory motion and the degree of trajectory motion in a stable state.

[0015] Furthermore, the reciprocating motion tool described in the second disclosed example is able to suppress dust dispersion. Attached Figure Description

[0016] Figure 1This is a perspective view taken from the upper left front of the reciprocating saw according to the first aspect of the present invention.

[0017] Figure 2 yes Figure 1 Central longitudinal section view.

[0018] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0019] Figure 4 yes Figure 3 AA sectional view.

[0020] Figure 5 Viewed from above Figure 2 A partial exploded three-dimensional view of a part of the reciprocating motion conversion mechanism and its surrounding components.

[0021] Figure 6 Viewed from below Figure 2 A partial exploded three-dimensional view of a part of the reciprocating motion conversion mechanism and its surrounding components.

[0022] Figure 7 yes Figure 2 A central longitudinal section view of a portion of the reciprocating motion conversion mechanism and its surrounding components.

[0023] Figure 8 It is to rotate the knob of the trajectory switching operation handle from Figure 7 The central longitudinal section view when the object is pushed forward.

[0024] Figure 9 From Figure 1 A three-dimensional view of the upper right front of the front part of the reciprocating saw.

[0025] Figure 10 yes Figure 2 A magnified view of the front section.

[0026] Figure 11 yes Figure 10 BB cross-sectional view.

[0027] Figure 12 yes Figure 10 CC section view.

[0028] Figure 13 yes Figure 1 A partial three-dimensional exploded view of the upper front part of the reciprocating saw.

[0029] Figure 14 Viewed from the lower front Figure 1 A three-dimensional view of the upper power transmission housing of the reciprocating saw.

[0030] Figure 15A This is a central longitudinal sectional view of the main part of the reciprocating saw involved in the second aspect of the present invention, and is a diagram showing the highest point of the cam surface in the first-1 trajectory state when it is in the rearmost position. Figure 15B yes Figure 15A The central longitudinal section view of the main part of the reciprocating saw, and the diagram showing the lowest point of the cam surface in the first-1 trajectory state when it is in the rearmost position.

[0031] Figure 16A yes Figure 15A The diagram shows the central longitudinal section of the main part of the reciprocating saw, and is the diagram when the highest point of the cam surface is located at the rearmost position in the first-second trajectory state. Figure 16B yes Figure 16A The central longitudinal section view of the main part of the reciprocating saw, and the diagram showing the lowest point of the cam surface in the first-second trajectory state when it is in the rearmost position.

[0032] Figure 17A yes Figure 15A The diagram shows the central longitudinal section of the main part of the reciprocating saw, and is a diagram of the highest point of the cam surface in the second trajectory state when it is in the rearmost position. Figure 17B yes Figure 17A The diagram shows the central longitudinal section of the main part of the reciprocating saw, and is a diagram of the lowest point of the cam surface in the second trajectory state when it is in the rearmost position.

[0033] Figure 18 This is related to the third aspect of the present invention. Figure 11 Same diagram.

[0034] Figure 19 This is related to the third aspect of the present invention. Figure 14 Same diagram.

[0035] [Explanation of reference numerals in the attached figures]

[0036] 1: Reciprocating saw (reciprocating motion cutting tool); 3: Motor; 4: Fan; 5: Reciprocating motion conversion mechanism; 6: Sliding component; 12: Track mechanism; 14: Track switching mechanism; 20: Power transmission housing; 20a: Upper power transmission housing; 20: Lower power transmission housing; 22: Cover; 30: First grip part (grip part); 62: Lamp; 71: Stator; 72: Rotor; 108: Crank cam (crank); 122: Eccentric pin; 130: Cam part; 138: Blade holder part (top tool holder part); 156: Bearing; 161: Sliding component support; 170, 270: Track switching operating handle; 172, 272: Operating handle body (shaft-shaped part); 176, 276: First plane (support surface) ); 176a, 276a, 277a: Part 1; 176b, 276b, 277b: Part 2; 178: Second plane (surface for second trajectory state); 180: Protrusion; 181L, 181R: Gap (first channel); 186: Wall; 188L, 188R: Hole; 192: Second channel; 193: Third channel; 198: Lower front exhaust hole (lower exhaust hole); 240: Release drum; 277: Second plane (support surface); 278: Third surface (surface for second trajectory state); C: (imaginary) central axis (rotation axis) of the operating handle body; W1: (exhaust air of the first channel); W2: (exhaust air of the second channel); W3: (exhaust air of the third channel). Detailed Implementation

[0037] The reciprocating saw of the present invention may include: a motor; a rod-shaped slider; a reciprocating motion conversion mechanism that, when the extension direction of the slider is set to the front-back direction, converts the rotation of the motor into a front-back reciprocating motion and transmits it to the slider; and a blade holder that is capable of mounting a blade having an edge acting on the workpiece in a state where the edge is either lower or upper, and is disposed at the front end of the slider. It may also include a trajectory mechanism that causes the blade holder to perform a trajectory movement in the up-down direction in conjunction with the reciprocating motion of the slider. It may also include a trajectory switching mechanism that switches between at least one of the trajectory state involving the presence or absence of trajectory movement performed by the trajectory mechanism and the degree of trajectory movement performed by the trajectory mechanism. The trajectory switching mechanism may include an operating handle body extending in the left-right direction. The operating handle body may have a first plane capable of indirectly supporting the slider. The first plane may have a first portion and a second portion, the first portion being a portion forward of an imaginary central axis in the left-right direction in the operating handle body, and the second portion being a portion rearward of the central axis.

[0038] In this case, the slider is supported by the first and second portions of the first plane. Therefore, this support can suppress rotation of the operating handle body about the central axis when the knob is not operated. Thus, the operating handle body having the first plane allows for stable switching between at least one of the presence or absence of trajectory movement and the degree of trajectory movement.

[0039] Furthermore, the first plane can be switched between a state supporting the slider (supported at the lower part of the slider bracket in the first trajectory state) and a state not supporting the slider (configured on the front side of the slider bracket in the second trajectory state) by rotating the main body of the operating handle around the central axis. In this case, the structure for switching trajectory motion becomes simpler.

[0040] Furthermore, the first part and the second part can be a first plane that serves as a common plane. In this case, the first plane intersects the central axis in the front-rear direction, thereby simplifying the structure for stably supporting the sliding member.

[0041] Furthermore, the operating handle body can have multiple support surfaces as a first plane and a second plane. In this case, the slider is supported by a first portion and a second portion of the first plane, and by a first portion and a second portion of the second plane. Therefore, with these supports, rotation of the operating handle body about the central axis without operation can be suppressed. Thus, by having an operating handle body with a first plane and a second plane, it is possible to switch between at least one of the presence or absence of trajectory movement and the degree of trajectory movement in a stable state. Additionally, in a simple structure, a support surface for switching multiple trajectory states is provided, which supports multiple sliders.

[0042] Alternatively, the trajectory mechanism may include a slider support that supports the slider in a reciprocating manner. The first plane can support the slider via the slider support. In this case, the structure of the trajectory mechanism is simpler.

[0043] Additionally, the trajectory mechanism may include a cam portion capable of indirectly contacting the lower part of the slider. The trajectory movement of the blade holder can be achieved through this indirect contact between the cam portion and the slider. The trajectory switching mechanism can switch between a first trajectory state and a second trajectory state. In the first trajectory state, the cam portion either does not indirectly contact the slider or only a portion of the cam portion does. In the second trajectory state, a portion or the entire cam portion (larger than the portion that indirectly contacts the slider in the first trajectory state) indirectly contacts the slider. In this case, the structure of the trajectory mechanism and the trajectory switching mechanism is simpler.

[0044] Furthermore, the trajectory mechanism can include: a cylindrical slider support that supports the slider 6 in a reciprocating manner; and a bearing mounted on the outer surface of the slider support. The reciprocating motion conversion mechanism can be a disc-shaped crank cam with an eccentric pin in the vertical direction connected to the slider and extending forward, backward, left, and right. The cam portion can be configured as annular when viewed from above on the upper surface of the crank cam and can contact the bearing; the first plane can support the slider via the slider support. In this case, the structure of the trajectory mechanism and the trajectory switching mechanism is simpler.

[0045] Furthermore, at least a portion of the operating handle body can be cylindrical. In this case, the structure of the trajectory switching mechanism is simpler.

[0046] Additionally, the first trajectory state and the second trajectory state can be switched by rotating about the central axis of the operating handle body. The first trajectory state is a state where no trajectory movement or trajectory movement is performed within a first range, while the second trajectory state is a state where trajectory movement is performed within a second range larger than the first range. The first plane in the first trajectory state may include a first portion and a second portion. In this case, the first plane more stably supports the slider in the first trajectory state. Therefore, the stability of the first trajectory state is improved.

[0047] Furthermore, the operating handle body can have a second plane that supports the slider neither directly nor indirectly in the second trajectory state. The first plane can be positioned in front of the second plane. In this case, the structure of the trajectory switching mechanism is simpler.

[0048] Furthermore, the reciprocating saw may include: a motor having a stator and a rotor capable of rotating relative to the stator; a slider; a reciprocating motion conversion mechanism capable of converting the rotation of the rotor into the reciprocating motion of the slider; and a blade holder disposed at the front end of the slider. It also includes a trajectory switching handle that switches between a first trajectory state and a second trajectory state in trajectory motion, wherein the trajectory motion is the up-and-down movement of the blade holder accompanying the reciprocating motion of the slider, the first trajectory state being a state in which the trajectory motion occurs within a first range, and the second trajectory state being a state in which the trajectory motion occurs within a second range larger than the first range. The trajectory switching handle may have a first plane indirectly supporting the slider in the first trajectory state.

[0049] In this case, under the first trajectory state in the first range of trajectory motion, the slider is more stably supported by the first plane.

[0050] Additionally, it may have a first grip portion extending at least vertically. It may have a power transmission housing that holds the reciprocating motion conversion mechanism. It may have a slider support that supports the slider in a reciprocating motion state and is held in the power transmission housing in a swingable manner. The trajectory switching handle may be rotatable about an imaginary axis of rotation (central axis) extending horizontally. In a first trajectory state within a first range of trajectory movement, a first plane may support the lower part of the slider support. The first plane may be located directly above the axis of rotation (central axis). In this case, the stability of the support provided by the trajectory switching handle to the slider support is improved. Furthermore, rotation of the trajectory switching handle when not operated is suppressed, and switching of trajectory states without user operation is suppressed.

[0051] Furthermore, the trajectory switching handle may have a second plane, which serves to support the slider or, neither directly nor indirectly, the slider in a second trajectory state where the trajectory movement occurs within a second range larger than the first range. In this case, the structure of the trajectory switching mechanism is simpler.

[0052] Furthermore, the reciprocating saw according to the present invention may include: a motor having a stator and a rotor; a reciprocating motion conversion mechanism driven by the motor; a rod-shaped slider connected to the reciprocating motion conversion mechanism to perform reciprocating motion; and a blade holder held at the front end of the slider to hold the blade. It may have a power transmission housing that houses the reciprocating motion conversion mechanism, and the slider protrudes from the front end of the power transmission housing. It may have a cover disposed on the outside of the power transmission housing. It may have a fan capable of rotating integrally with the rotor. A first channel (gap) for cooling air from the fan may be provided between the power transmission housing and the cover. The first channel may branch into a second channel facing the end tool holder side and a third channel not facing the end tool holder side.

[0053] In this case, the airflow towards the top tool holding section is reduced, suppressing the flying of dust (chips).

[0054] The reciprocating saw of the present invention may include: a motor having a stator and a rotor; a reciprocating motion conversion mechanism driven by the motor; a rod-shaped slider connected to the reciprocating motion conversion mechanism for reciprocating motion; and a blade holder held at the front end of the slider for holding the blade. It may have a power transmission housing housing the reciprocating motion conversion mechanism, with the slider protruding from the front end of the power transmission housing. It may have a cover disposed on the outside of the power transmission housing. It may have a fan capable of rotating integrally with the rotor. A first channel for cooling air from the fan may be provided between the power transmission housing and the cover. The first channel may connect to a channel leading to the outside, but not towards the blade holder side.

[0055] In this case, the wind blowing towards the top tool holding part can be suppressed, thereby suppressing the flying of dust.

[0056] The third channel may include a hole opened in the power transmission housing. In this case, the third channel is formed more simply.

[0057] The third channel may include a wall portion disposed on the power transmission housing. In this case, the third channel is formed more simply.

[0058] The wall can be an arc-shaped strip. In this case, it is simpler to form a third channel surrounding the slider.

[0059] The blade's operating direction can be set to vertical, and the first channel is located between the upper part of the power transmission housing and the upper part of the cover. In this case, the first channel is more easily formed to avoid reciprocating motion conversion mechanisms, etc.

[0060] The third channel may include a hole located in the upper part of the power transmission housing. In this case, the third channel is more simply formed.

[0061] The third channel may include a lower exhaust port located at the bottom of the power transmission housing. In this case, forming the third channel is simpler. Additionally, the airflow from the third channel is less likely to be directed towards the blade holder.

[0062] The sliding member can extend in a front-to-back direction and has a light that illuminates the front of the blade holder. The first channel can be divided into two parts by a protrusion, wherein the protrusion houses the lamp lead and extends in a front-to-back direction. In this case, the first channel and the lamp can be formed more simply.

[0063] The third channel may include a hole formed in the power transmission housing. Two holes may be located on either side of the protrusion. In this case, the first and third channels, along with the lamp, can be formed more simply.

[0064] The blade's operating direction can be set to vertical, and the power transmission housing has an upper power transmission housing and a lower power transmission housing located below it. In this case, the power transmission housing is more easily formed in a state where the internal mechanism can be configured.

[0065] The third channel may include a wall formed on the upper power transmission housing. In this case, it is simpler to form the upper power transmission housing and the third channel.

[0066] The third channel may include a lower wall portion formed on the lower power transmission housing. In this case, it is simpler to form the lower power transmission housing and the third channel.

[0067] The third channel may include a wall portion formed on the upper power transmission housing. The lower end of the wall portion may be continuously joined to the upper end of the lower wall portion. In this case, it is simpler to form the upper power transmission housing, the lower power transmission housing, and the third channel.

[0068] It can also have a cylindrical release drum for releasing the blade held by the blade holder. A second channel can be configured radially inside the release drum. In this case, the release drum and the second channel can be formed more simply.

[0069] Hereinafter, embodiments and variations thereof of the present invention will be described appropriately with reference to the accompanying drawings.

[0070] This method relates to a reciprocating cutting tool, which is an example of a power tool or a reciprocating tool, and more specifically, to a reciprocating saw.

[0071] The directions in this method and the variations are for ease of explanation and may vary depending on the working conditions and the state of the moving parts, or at least one of them.

[0072] Furthermore, the present invention is not limited to this method and its modifications.

[0073] [Method 1]

[0074] Figure 1 This is a perspective view of the reciprocating saw 1 according to the first aspect of the present invention, viewed from the upper left front. Figure 2 yes Figure 1 Central longitudinal section view. Figure 3 yes Figure 2 A magnified view of a portion of the image. Figure 4 yes Figure 3 AA section view. In Figure 2 and Figure 3 In the diagram, the right side is the front of reciprocating saw 1, and the top side is the top of reciprocating saw 1.

[0075] The reciprocating saw 1 has a main body shell 2, a motor 3, a fan 4, a reciprocating motion conversion mechanism 5, a sliding part 6 as the output part, a guide shoe 8, a counterweight mechanism 9, a trajectory mechanism 12, a trajectory switching mechanism 14, and a release mechanism 201.

[0076] The main body shell 2 is a support frame that directly or indirectly holds various components.

[0077] The main body housing 2 includes a motor housing 18, a power transmission housing 20, and a cover 22.

[0078] The front of the motor housing 18 is cylindrical. The rear of the motor housing 18 is annular. The motor housing 18 is made of plastic.

[0079] The motor housing 18 holds the motor 3 within its upper front portion. The motor 3 has a motor housing 3a. The motor housing 3a is the outer contour of the motor 3. The motor housing 3a is cylindrical. The front of the motor housing 3a is open. The motor housing 18 is connected to the power transmission housing 20 via the motor housing 3a.

[0080] The motor housing 18 is a split shape, having a left motor housing 18a and a right motor housing 18b.

[0081] The left motor housing 18a has multiple threaded protrusions 24. The right motor housing 18b has multiple threaded holes (not shown). The arrangement of the threaded holes corresponds to the arrangement of the threaded protrusions 24. The right motor housing 18b is secured to the left motor housing 18a by inserting multiple screws 28 into the threaded protrusions 24 and the threaded holes, respectively, in a left-right direction.

[0082] The rear part of the annular portion extending vertically in the motor housing 18 is the first grip portion 30. The first grip portion 30 is held by the user.

[0083] Multiple air inlets 31 are provided in the annular portion at the rear of the motor housing 18, facing the front surface of the first grip portion 30. Each air inlet 31 extends in the left-right direction and is arranged in the up-down direction. A motor 3 is disposed in front of each air inlet 31.

[0084] The main switch 32 is held on the upper part of the first grip portion 30.

[0085] The main switch 32 has a trigger 33 and a main switch body 34.

[0086] The trigger 33 protrudes from the front of the upper part of the first grip portion 30. The user can pull the trigger 33 with their fingertip (moving it backward). The trigger 33 is positioned in front of the main switch body portion 34. The trigger 33 is connected to the main switch body portion 34.

[0087] The main switch body 34 is disposed within the upper part of the first grip portion 30. The main switch body 34 is switched on and off by operation of the trigger 33. The main switch body 34 is turned on when the trigger 33 is engaged to a predetermined amount or more. In addition, the main switch body 34 sends a signal (e.g., a resistance value) that changes according to the engagement amount or more than the predetermined amount.

[0088] The trigger 33 switches the motor 3 on and off via the main switch body 34. The trigger 33 is a switch operating part used to operate the motor 3 on and off.

[0089] An unlock button 35 is provided on the upper side of the trigger 33. The unlock button 35 is a plate-shaped part that extends in the left-right direction.

[0090] The left and right portions of the unlock button 35 protrude from the motor housing 18. The unlock button 35 can slide to the right by pressing its left portion. Additionally, the unlock button 35 can slide to the left by pressing its right portion.

[0091] When the unlock button 35 slides to the right and is positioned on the right side, it prevents the trigger 33 from being pulled. Therefore, the motor 3 cannot be activated. When the unlock button 35 slides to the left and is positioned on the left side, it allows the trigger 33 to be pulled. Therefore, the motor 3 can be activated.

[0092] A speed switching dial 36 is located in front of the unlock button 35. The speed switching dial 36 is a disc that extends upwards, downwards, leftwards, and rightwards, and can be rotated. The upper part of the speed switching dial 36 protrudes from the motor housing 18.

[0093] The speed switching dial 36 sends a signal corresponding to the rotation position (angle).

[0094] The motor housing 18 holds the controller 40 on the underside of the motor 3. The controller 40 has a control circuit board 42 and a controller housing 44.

[0095] The control circuit board 42 controls the motor 3. The control circuit board 42 is equipped with at least a microcomputer and multiple (6 or 12) switching elements.

[0096] The controller housing 44 is made of metal (aluminum) and is a lidless box shape. The control circuit board 42 is housed inside the controller housing 44. A molding layer 46 covering the control circuit board 42 is formed by injecting molding material into the controller housing 44.

[0097] The controller 40 is positioned below the motor 3. The controller 40 is tilted, more specifically, tilted forward and upward (front higher than rear).

[0098] The front surface of the controller housing 44 is positioned along the front wall 18W of the lower front portion 18F of the motor housing 18. The motor housing 18 holds the controller 40.

[0099] Multiple rear lower exhaust ports 48 are provided at the lower front part 18F of the motor housing 18. Each rear lower exhaust port 48 extends in the left-right direction and is arranged in the front-back and left-right directions.

[0100] Each rear lower exhaust port 48 is disposed in the portion of the motor housing 18 that is lower than the portion holding the controller 40. That is, each rear lower exhaust port 48 is disposed in the portion of the motor housing 18 opposite to the controller 40 and opposite to the fan 4.

[0101] The front surface of the controller housing 44 and the front wall 18W form an exhaust path for the exhaust air WD from the fan 4 for cooling. The exhaust air WD is discharged to the outside through each of the rear lower exhaust ports 48.

[0102] The lower rear portion 18E of the motor housing 18 is recessed upward relative to the lower front portion 18F of the motor housing 18.

[0103] A battery mounting portion 50 is provided on the lower rear part 18E of the motor housing 18.

[0104] An opening is formed on the lower rear part 18E of the motor housing 18.

[0105] The battery mounting section 50 holds the terminal block 52. The front of the terminal block 52 is box-shaped, and the rear of the terminal block 52 is plate-shaped. The terminal block 52 blocks the opening at the lower rear part 18E of the motor housing 18 and protrudes from the opening. The terminal block 52 holds multiple terminal plates (not shown).

[0106] The battery 54 is mounted on the battery mounting section 50 by sliding from the rear to the front. The mounted battery 54 is electrically connected to the terminal block 52 (terminal plate). The battery 54 supplies power to the motor 3.

[0107] The power transmission housing 20 directly or indirectly supports the reciprocating motion conversion mechanism 5, the sliding member 6, the counterweight mechanism 9, the trajectory mechanism 12, and the trajectory switching mechanism 14. The power transmission housing 20 is made of metal. The power transmission housing 20 is connected to the front side of the motor housing 18.

[0108] The power transmission housing 20 is a split-shaped cylindrical structure with openings at the front and rear. Because it is equipped with the reciprocating motion conversion mechanism 5, the power transmission housing 20 can also serve as the housing for the conversion mechanism.

[0109] The power transmission housing 20 has an upper power transmission housing 20a, a lower power transmission housing 20b, and a bearing cage 114.

[0110] The upper power transmission housing 20a is secured by multiple vertical screws 55. Figure 4 It is fixed to the lower power transmission housing 20b.

[0111] The rear end of the lower power transmission housing 20b is mounted to the front end of the motor housing 18 by a plurality of screws (not shown) extending forward from the motor housing 3a in the front-back direction.

[0112] The cover 22 is cylindrical. The cover 22 is mounted on the power transmission housing 20. The cover 22 is disposed on the outside of the power transmission housing 20. The cover 22 is made of an elastomer (rubber) and is disposed on the outside of the power transmission housing 20 as a thermal insulation cover or an electrical insulation cover. Alternatively, the cover 22 may not be included in the constituent elements of the main housing 2. Alternatively, the cover 22 may be formed of plastic.

[0113] The rear end of the cover 22 covers the front end of the motor housing 18. The cover 22 is continuous with the motor housing 18 on its outer surface.

[0114] Multiple exhaust vents 56 of the main body are provided on the left and right sides of the central part of the cover 22. Figure 1 , Figure 9 The vents 56 on the left side of each main body extend in the front-to-back direction and are arranged in the vertical direction. Similarly, the vents 56 on the right side of each main body... Figure 9 It extends in the front-to-back direction and is arranged in the vertical direction. The exhaust vents 56 of each main body are positioned in front of the fan 4.

[0115] In addition, the trajectory switching operation handle has a hole 58 on the rear left side of the cover 22. Figure 1 The trajectory switching handle is extended in the up-down and back-forward directions using hole 58.

[0116] On the other hand, the lower part of the cover 22, that is, the front part of the main body shell 2, becomes the second grip part 60. The second grip part 60 is held by the user.

[0117] Furthermore, at least one of the following can be varied: the number of segments of the main body housing 2, the size of each segment of the main body housing 2, and the shape of each segment of the main body housing 2. For example, the rear part of the motor housing 18 can also be formed as a handle housing that is separate from the motor housing 18. In addition, the battery mounting part 50 can also be separate from the motor housing 18.

[0118] Additionally, a lamp 62 is disposed between the upper front portion of the power transmission housing 20 and the upper front portion of the cover 22. The lamp 62 has an LED substrate. The LED substrate is equipped with LEDs.

[0119] Lamp 62 emits light and shines it forward. Lamp 62 can illuminate the area near the cutting position in front of slider 6.

[0120] Motor 3, main switch body 34, speed switching dial 36, terminal block 52 (terminal plate) and lamp 62 are electrically connected to control circuit board 42 via multiple leads (not shown).

[0121] The main body 69 of the reciprocating saw 1 is formed by the part that holds the motor 3 in the motor housing 18 (the part outside the motor 3), the power transmission housing 20, the various parts held by the above-mentioned parts, and the cover 22.

[0122] Motor 3 is an electric motor. Motor 3 is a brushless motor. Motor 3 is driven by DC.

[0123] The motor 3 has a motor housing 3a, a stator 71 and a rotor 72.

[0124] The motor housing 3a is held on the motor housing 18.

[0125] The stator 71 has multiple (6) coils 73. The stator 71 is cylindrical.

[0126] A sensor substrate 75 is fixed to the stator 71. Multiple (3) magnetic sensors are fixed to the rear surface of the sensor substrate 75. Each magnetic sensor receives a rotation detection signal indicating the rotational position of the rotor 72 to acquire the rotational state of the rotor 72. Furthermore, the sensor substrate 75 and the control circuit board 42 are electrically connected via multiple (6) leads (signal lines) not shown. The signal lines pass through the lower front portion 18F of the motor housing 18.

[0127] Furthermore, a coil connection portion 77 is provided on the stator 71, which serves as a contact to electrically connect each coil 73 in a predetermined manner. The coil connection portion 77 is connected to the first end of multiple (3) leads (power lines) not shown. The three power lines involve three phases. Each power line passes through the lower front part 18F of the motor housing 18. The second end of each power line is connected to the control circuit board 42.

[0128] The rotor 72 is located inside the stator 71. The motor 3 is an internal rotor type.

[0129] The rotor 72 has a motor shaft 80, a rotor core 82, multiple (4) permanent magnets 84, and a sleeve 86.

[0130] The motor shaft 80 is cylindrical and extends front to back. The motor shaft 80 is made of metal. The motor shaft 80 rotates about its own axis. The front end of the motor shaft 80 reaches the rear end of the power transmission housing 20. A pinion portion 80a is formed at the front end of the motor shaft 80. The pinion portion 80a has multiple teeth.

[0131] The rotor core 82 is cylindrical. The axial direction of the rotor core 82 is back-to-back. The rotor core 82 is formed by multiple steel plates stacked in the back-to-back direction and extending in the up-down and left-right directions. The rotor core 82 is fixed to the outside of the motor shaft 80.

[0132] Each permanent magnet 84 is plate-shaped. The four permanent magnets 84 are arranged inside the rotor core 82 in a manner that alternates in polarity in the circumferential direction. The four permanent magnets 84 do not contact each other.

[0133] The sleeve 86 is made of metal (brass) and is ring-shaped. The sleeve 86 is fixed to the front side of the rotor core 82 and each permanent magnet 84, as well as the motor shaft 80. The sleeve 86 prevents the permanent magnets 84 from falling off the motor shaft 80 by fixing the permanent magnets 84 in place.

[0134] Additionally, a front motor bearing 88 is provided in front of the sleeve 86. The front motor bearing 88 is disposed around the front portion of the motor shaft 80. The front motor bearing 88 supports the motor shaft 80 in a manner that allows it to rotate about its axis.

[0135] The motor front bearing 88 is held at the rear of the lower power transmission housing 20b.

[0136] A rear bearing 92 is provided around the rear end of the motor shaft 80. The rear bearing 92 supports the motor shaft 80 in a manner that allows it to rotate about its axis. The rear bearing 92 is held in place by the motor housing 3a.

[0137] A fan 4 is disposed around the central periphery of the motor shaft 80, behind the front bearing 88 and in front of the sleeve 86. The fan 4 is a centrifugal fan with multiple blades. The fan 4 exhausts air radially outward by rotating. The fan 4 is integrally fixed to the motor shaft 80 and can rotate integrally with the motor shaft 80. The fan 4 is mounted on the motor shaft 80. The fan 4 is held in the motor housing 18 via the rotor 72 and the lower power transmission housing 20b.

[0138] A lower power transmission housing 20b is configured on the front side of the fan 4.

[0139] The upper end of the air duct (lower air duct) is arranged below the fan 4. The air duct is located between the front surface of the controller housing 44 and the front wall 18W of the lower front part 18F of the motor housing 18.

[0140] Alternatively, the fan 4 can also be a component of the motor 3.

[0141] Figure 5 , Figure 6 This is a partial three-dimensional exploded view of a portion of the reciprocating motion conversion mechanism 5 and its surrounding components, viewed from the top and bottom sides. Figure 7This is a central longitudinal sectional view of a part of the reciprocating motion conversion mechanism 5 and its surrounding components. Figure 8 The knob 174 of the trajectory switching handle 170 is from... Figure 7 The state is pushed forward (refer to the case where the state is pushed down). Figure 1 The central longitudinal section view (with double-dotted lines).

[0142] The reciprocating motion conversion mechanism 5 is a power transmission mechanism that transmits the power of the motor 3 to the sliding member 6. The reciprocating motion conversion mechanism 5 transmits the rotational motion of the motor shaft 80 of the motor 3 to the sliding member 6. The reciprocating motion conversion mechanism 5 is held on the power transmission housing 20. The reciprocating motion conversion mechanism 5 is clamped between the motor 3 and the sliding member 6.

[0143] The reciprocating motion conversion mechanism 5 includes a bevel gear 100, a torque limiting mechanism 102, an intermediate shaft 104, a crank base 106, and a crank cam 108.

[0144] The bevel gear 100 is a disc-shaped component extending in the front-back and left-right directions, with a bevel gear (not shown) on the periphery of its upper surface. The bevel gear 100 meshes with the pinion section 80a.

[0145] The bevel gear 100 rotates about an imaginary axis of rotation that passes through the center in the front-back, left-right and right directions, and in the up-down direction.

[0146] The torque limiting mechanism 102 is installed between the bevel gear 100 and the intermediate shaft 104.

[0147] The torque limiting mechanism 102 transmits power from the bevel gear 100 to the intermediate shaft 104. The torque limiting mechanism 102 causes the upper and lower horizontal plates, which are pressed together by the force applied by the elastic body, to separate from each other by resisting the applied force by excessive load from the side of the intermediate shaft 104, thereby protecting the bevel gear 100 and the motor 3 from the effect of the load.

[0148] The intermediate shaft 104 is a cylindrical component that extends vertically.

[0149] The intermediate shaft 104 is supported by an upper intermediate bearing 110 and a lower intermediate bearing 112 in a manner that allows it to rotate about the same imaginary axis of rotation as the bevel gear 100. Figure 2 , Figure 3 ).

[0150] The upper intermediate bearing 110 is held in the lower power transmission housing 20b.

[0151] The lower intermediate bearing 112 is a needle roller bearing. The lower intermediate bearing 112 is held in a disc-shaped bearing cage 114. Figure 2 , Figure 3 The bearing cage 114 is secured by multiple screws 116 in the vertical direction. Figure 2 ,Figure 3 Only one is shown in the image, which is fixed to the lower power transmission housing 20b.

[0152] The crank base 106 is a crank-shaped component.

[0153] The lower part of the crank base 106 is a cylindrical part 106A, which is threaded to the upper part of the intermediate shaft 104.

[0154] The central part of the crank base 106 becomes a plate-shaped part 106B extending in the front-back and left-right directions.

[0155] The upper part of the crank base 106 is formed as an eccentric disk portion 106C whose center is offset from the imaginary central axis of the lower part of the crank base 106 and extends in the front-back and left-right directions.

[0156] The crank cam 108 has a crank cam body 120, an eccentric pin 122, a barrel roller 124, and a bearing 126.

[0157] The crank cam body 120 is a disc-shaped component extending in the forward, backward, left, and right directions. The imaginary central axis in the vertical direction of the crank cam body 120 coincides with the imaginary axis of rotation of the bevel gear 100. A connecting portion 127, which protrudes downward in a cylindrical shape relative to other parts, is formed at the lower part of the crank cam body 120. The eccentric disc portion 106C of the crank base 106 is connected to the connecting portion 127 by a screw 128. Furthermore, a cam portion 130 is formed on the periphery of the upper surface of the crank cam body 120. The cam portion 130 protrudes upward relative to adjacent parts. When viewed from above, the cam portion 130 is annular. The height of the cam portion 130 in the vertical direction gradually changes circumferentially (see reference). Figure 7 , Figure 8 (etc.). That is, the upper surface of the cam portion 130 is called the cam surface 130a. The height of the cam surface 130a gradually changes from the lowest point 130a1 to the highest point 130a2.

[0158] The eccentric pin 122 is a cylindrical shape extending in the vertical direction. The lower part of the eccentric pin 122 is inserted into a hole provided in the vertical direction of the crank cam body 120. This hole is offset radially from the imaginary central axis of the crank cam body 120.

[0159] The barrel roller 124 is a cylindrical component. The outer surface of the barrel roller 124 bulges out in such a way that the diameter increases towards the center in the vertical direction.

[0160] The barrel roller 124 is mounted on the upper part of the eccentric pin 122 via a bearing 126. The barrel roller 124 is supported in a manner that allows it to rotate about an imaginary central axis in the vertical direction. The bearing 126 is a needle roller bearing.

[0161] The slider 6 has a slider body 136 and a blade holder 138 as a top tool holder. The front end of the slider 6 protrudes from the front end of the power transmission housing 20.

[0162] The slider body 136 has a cylindrical shape extending front to back. A barrel-shaped roller receiving portion 140 is provided at the rear of the slider body 136. The barrel-shaped roller receiving portion 140 has a bottomed elongated cylindrical shape extending in the left-right direction. The barrel-shaped roller receiving portion 140 opens downward. The barrel-shaped roller receiving portion 140 receives the barrel-shaped roller 124.

[0163] When the crank cam 108 rotates, the barrel roller 124 rotates eccentrically. The component of the barrel roller 124's movement in the front-to-back direction causes the slider body 136 to reciprocate in the front-to-back direction via the barrel roller receiving portion 140. The component of the barrel roller 124's movement in the left-to-right direction is the relative movement of the barrel roller 124 within the barrel roller receiving portion 140 and is not transmitted to the slider body 136.

[0164] The blade holder 138 holds the blade (not shown) which serves as the tip tool. The blade holder 138 automatically holds the blade simply by inserting the rear end of the blade (one-click installation).

[0165] The blade holder 138 bulges upwards, downwards, leftwards, and rightwards relative to the slider body 136. The slider 6 is the output part. The blade is a tip tool. The blade is long and plate-shaped, extending in the front-to-back direction during installation. The blade has a cutting edge on one long side. The blade is serrated. The blade is installed with the cutting edge facing downwards. Alternatively, the blade can also be installed with the cutting edge facing upwards. Additionally, the blade can have cutting edges on both long sides. The tip tool can also be a tool other than the blade.

[0166] The guide shoe 8 is disposed adjacent to the blade, which is mounted on the blade holder 138.

[0167] The counterweight mechanism 9 is combined with the reciprocating motion conversion mechanism 5.

[0168] The counterweight mechanism 9 has a metal balance element 144 and a ring 145.

[0169] The balancing member 144 is a plate-shaped part extending in the forward, backward, left, and right directions, and has an elongated hole 146 extending in the left and right directions in the center. The portion in front of the elongated hole 146 in the balancing member 144 is heavier than the portion behind the elongated hole 146.

[0170] The engagement portion 127 of the crank cam 108 enters the elongated hole 146 of the balancer 144 via the ring 145.

[0171] A slit 147 extending forward and backward is provided in the portion of the balancing member 144 that is forward of the elongated hole 146. A pin 148 passes through the slit 147. The pin 148 extends in the vertical direction. The lower part of the pin 148 is held on the lower power transmission housing 20b.

[0172] A recess 149 is provided in the lower part of the portion of the balancing member 144 that is rearward of the elongated hole 146. This recess 149 is recessed upward relative to the surrounding portion. The recess 149 avoids the upper rear part of the lower power transmission housing 20b (see reference). Figure 3 ).

[0173] The balancing member 144 reciprocates in the front-rear direction due to the rotation of the crank cam 108. The connecting portion 127 is positioned on the opposite side of the barrel roller 124, across the center of the crank cam body 120. More specifically, the connecting portion 127 and the barrel roller 124 form an angle of approximately 175° with respect to the center of the crank cam body 120 in the front-rear and left-right directions. Therefore, the portion of the balancing member 144 forward of the elongated hole 146 moves substantially in the front-rear direction in the opposite direction to the slider 6. Thus, vibrations generated by the reciprocating motion of the slider 6 are suppressed by the balancing member 144. That is, the balancing member 144 acts as a counterweight by moving in the opposite direction to the movement of the slider 6 in the front-rear direction. Furthermore, the left-right component of the movement of the connecting portion 127 becomes the relative movement of the connecting portion 127 within the elongated hole 146, and is not transmitted to the balancing member 144. Additionally, the angle between the connecting portion 127 and the barrel roller 124 can be 180° or other angles.

[0174] The trajectory mechanism 12 includes a slider support body 150, multiple (two) oilless bearings 151 as slider supports, multiple (two) plates 152, slider support shaft 153, multiple springs 154 as elastic bodies, bearings 156 and multiple screws 160.

[0175] The sliding bracket 161 is cylindrical, consisting of a sliding bracket body 150, oilless bearings 151, plates 152, bearings 156, and screws 160. Alternatively, bearings 156 and the like can be removed from the components of the sliding bracket 161. Furthermore, the components of the sliding bracket 161 may include at least one of a sliding bracket shaft 153 and springs 154.

[0176] The sliding bracket body 150 is made of metal and is box-shaped, extending in the front-to-back direction.

[0177] The oilless bearing 151 is held in a front-to-back position within the sliding support body 150. The cross-sectional shape of the oilless bearing 151 is square.

[0178] The sliding member 6 passes through each oilless bearing 151 in a reciprocating motion.

[0179] An opening is provided in the lower central portion of the sliding member support body 150, in the portion where the barrel roller 124 and the barrel roller bearing portion 140 can be located. Each oilless bearing 151 is positioned before and after this opening.

[0180] The rear plate 152 is fixed to the lower rear of the sliding member bracket body 150 by a plurality of screws 160 in the vertical direction (two in the horizontal direction) and is fixed to the lower side of the rear oilless bearing 151. The rear plate 152 is made of metal and extends in the front-back and left-right directions. The sliding member bracket body 150 holds the rear oilless bearing 151 from the top. The rear plate 152 holds the rear oilless bearing 151 from the bottom.

[0181] The front plate 152 is fixed to the lower front of the slider bracket body 150 by a plurality of screws 160 in the vertical direction (two in the horizontal direction) and is fixed to the lower side of the front oilless bearing 151. The front plate 152 is made of metal and extends in the front-back and left-right directions. The slider bracket body 150 holds the front oilless bearing 151 from the top. The front plate 152 holds the front oilless bearing 151 from the bottom.

[0182] Alternatively, plate 152 and screw 160 can be omitted.

[0183] Shaft holes 162 extending in the left-right direction are provided on the left and right sides of the lower front part of the sliding member bracket body 150. The periphery of the shaft holes 162 is fixed to the upper power transmission housing 20a.

[0184] The slider bracket shaft 153 passes through the left and right shaft holes 162. The slider bracket 161 can swing around the slider bracket shaft 153.

[0185] Each spring 154 is disposed on the left and right sides of the upper rear part of the sliding member support body 150. Each spring 154 extends in the vertical direction. The upper end of each spring 154 is held on the inner surface of the rear part of the upper power transmission housing 20a.

[0186] The bearing 156 is located behind the opening in the lower part of the sliding member support body 150 and in front of the plate 152. The bearing 156 is a ball bearing.

[0187] The inner ring of bearing 156 is held on the outer surface of oilless bearing 151. The outer ring of bearing 156 is able to contact the cam portion 130 of crank cam 108.

[0188] The trajectory switching mechanism 14 has a trajectory switching operation handle 170 as a trajectory switching component.

[0189] The track switching handle 170 has a handle body 172 as a shaft-shaped part and a knob part 174.

[0190] The main body 172 of the operating handle is a rod-shaped structure extending to the left and right, and is axial in shape.

[0191] The trajectory switching handle 170 is able to rotate around the imaginary central axis C of the handle body 172 (see reference). Figure 7 , Figure 8 The rotational state is maintained in the upper power transmission housing 20a. The imaginary central axis C of the operating handle body 172 is parallel to the contact plate 152.

[0192] The operating handle body 172 has: a first plane 176, which serves as a support surface extending in the left-right direction; and a second plane 178, which serves as a surface for a second trajectory state extending in the left-right direction. The first plane 176 and the second plane 178 form a predetermined angle (approximately 100° in this case). The distance from the central axis C to the first plane 176 is greater than the distance from the central axis C to the second plane 178.

[0193] When the trajectory is in state 1 Figure 7 In the first trajectory state, the trajectory switching handle 170 is in a state where the first plane 176 can contact the lower rear part (rear plate 152) of the slider bracket 161. When the trajectory switching handle 170 contacts the plate 152, the first plane 176 spans the imaginary vertical plane V (vertical plane, see reference) in the front-back direction. Figure 7 On both sides of the imaginary vertical plane V, the imaginary vertical plane V is a plane that includes the central axis C and is perpendicular to the first plane 176. That is, the first plane 176 spans the vertical plane V. In other words, the first plane 176 has a first portion 176a that is forward of the central axis C (vertical plane V) and a second portion 176b that is backward of the central axis C (vertical plane V). In addition, Figure 4 This diagram uses the vertical plane V as a cross-section.

[0194] On the other hand, when the trajectory is in state 2 Figure 8 In the second trajectory state, the trajectory switching operation handle 170 is positioned such that the second plane 178 faces the lower rear part of the slider support 161 at a distance. In this state, the bearing 156 of the trajectory mechanism 12 is in full circumferential contact with the cam surface 130a of the cam portion 130.

[0195] In the second trajectory state, due to the downward force applied by each spring 154, the bearing 156 also contacts the lowest point 130a1 of the cam surface 130a in the cam portion 130 (see reference). Figure 8Even in this case, the second plane 178 of the operating handle body 172 is spaced apart from the lower rear part of the slider support 161. Therefore, the slider support 161, slider 6, and blade move upwards (front high, rear low). Additionally, the bearing 156 contacts the highest point 130a2 on the cam surface 130a. Thus, the bearing 156 is pushed upwards by the force applied by each spring 154 through the cam surface 130a, causing the slider support 161, slider 6, and blade to move downwards (front low, rear high). The height of the portion of the cam surface 130a between the lowest point 130a1 and the highest point 130a2 in the circumferential direction gradually changes. Therefore, by rotating the crank cam 108, the bearing 156 moves up and down relative to the cam surface 130a. Therefore, the slider support 161, slider 6, and blade repeatedly move in a front-high-rear-low state, a forward-backward state, a front-low-rear-high state, and a forward-backward-backward state, while the blade holding part 138 moves in an elliptical trajectory.

[0196] The trajectory motion is correlated with the reciprocating motion of the slider 6 based on the circumferential distribution of the height of the cam surface 130a on the crank cam 108. Here, the height distribution of the cam surface 130a is adjusted so that when the slider 6 moves forward, it is in a front-high, rear-low state; when the slider 6 switches its movement direction from front to back (or passes near the switching point), it is in a forward-backward state; when the slider 6 moves backward, it is in a front-low, rear-high state; and when the slider 6 switches its movement direction from back to front (or passes near the switching point), it is in a forward-backward state.

[0197] Even if the position of the slider bracket 161 and the slider 6 changes upward or downward, the slider 6 will still reciprocate fully via the barrel roller 124.

[0198] On the other hand, in the first trajectory state, the rear part of the slider support 161 is lifted by the first plane 176 of the operating handle body 172, so the bearing 156 does not contact the lowest point 130a1 in the cam surface 130a and its adjacent part. Therefore, compared with the case in the second trajectory state, the front-high-rear-low situation of the slider 6 is suppressed. In contrast, the bearing 156 contacts the highest point 130a2 in the cam surface 130a and its adjacent part.

[0199] Furthermore, the bearing 156 contacts the cam portion 130 at approximately half of its length, but does not contact the cam portion 130 at the remaining portion due to the first plane 176 of the operating handle body 172. Therefore, the migration from a state along the front-rear direction to a state with a lower front and higher rear when the slider 6 moves rearward (the semi-elliptical trajectory movement of the blade holder 138 when the slider 6 moves rearward) occurs similarly to the second trajectory state, but when the slider 6 moves forward, the slider 6 maintains a state approximately along the front-rear direction. Therefore, when the blade holder 138 is in the first trajectory state, it exhibits a semi-elliptical trajectory movement.

[0200] In the first trajectory state, the blade holding part 138 moves within a range of approximately half a circumference (the first range). In contrast, in the second trajectory state, the blade holding part 138 moves within a full circumference range (the second range), which is larger than the range of approximately half a circumference (the first range).

[0201] Furthermore, in the first trajectory state, trajectory motion may not occur throughout the entire range, or the range of trajectory motion (the proportion of presence or absence) may be changed. For example, the trajectory motion may only be a quarter-elliptical arc, while no trajectory motion occurs in the remaining three-quarters. Similarly, in the second trajectory state, trajectory motion may not occur in a portion of the range. That is, when the range of trajectory motion in the first trajectory state (first range) is smaller than the range of trajectory motion in the second trajectory state (second range), the range of trajectory motion can be changed in various ways.

[0202] The knob part 174 intersects with the operating handle body 172, and is orthogonal here.

[0203] The knob 174 is located on the left side of the power transmission housing 20 and the cover 22, and is exposed to the outside. The knob 174 is located inside the track switching operation handle hole 58 of the cover 22.

[0204] The user can operate the knob 174 to rotate the track switching handle 170 around the central axis C, thereby switching the track status.

[0205] Figure 9 This is a three-dimensional view of the front of the reciprocating saw 1 from the upper right front. Figure 10 yes Figure 2 A magnified view of the front section. Figure 11 yes Figure 10 BB cross-sectional view. Figure 12 yes Figure 10 CC section view. Figure 13 This is a partial three-dimensional exploded view viewed from the upper front part of the reciprocating saw 1. Figure 14This is a perspective view of the front of the upper power transmission housing 20a, viewed from below. Additionally, in Figure 9 In the middle, the front plate of guide shoe 8 is omitted.

[0206] A gap exists between the left side of the power transmission housing 20 and the left side of the cover 22, through which the exhaust air WL for cooling from the fan 4 passes. The exhaust air WL is discharged to the outside from the exhaust ports 56 of each main body on the left side. Figure 1 ).

[0207] Similarly, a gap exists between the right side of the power transmission housing 20 and the right side of the cover 22, through which the exhaust air WR for cooling from the fan 4 passes. The exhaust air WR is discharged to the outside from the exhaust ports 56 of each main body on the right side. Figure 9 ).

[0208] Additionally, a protruding section 180 is formed on the upper part of the upper power transmission housing 20a, and the protruding section 180 includes a pair of protrusions extending in the front-rear direction. The protruding section 180 includes a pair of walls that protrude upward relative to adjacent portions. A receiving portion 180a for a lamp 62 is formed at the front end of the protruding section 180. Leads connecting the lamp 62 and the control circuit board 42 pass through the protruding section 180. The protruding section 180 receives the leads of the lamp 62.

[0209] The upper end of the protrusion 180 contacts the upper inner surface of the cover 22. Gap 181L and 181R, serving as first channels, are provided between the upper part of the upper power transmission housing 20a and the upper part of the cover 22, and on both the left and right sides of the protrusion 180. Exhaust air W1 from the fan 4 passes through gaps 181L and 181R. Figure 2 , Figure 3 and Figure 10 For convenience, the exhaust air W1 is depicted as overlapping within the protrusion 180, but in reality, the exhaust air W1 almost entirely passes through the gaps 181L and 181R.

[0210] In addition, the first channel for exhaust can be either not divided into two channels (left and right) or divided into three or more channels.

[0211] A front wall 184 extending in the vertical and horizontal directions is provided at the front of the upper power transmission housing 20a. The front wall 184 is disposed on the front side of the slider bracket 161. The front wall 184 has a hole for the slider body 136 to pass through.

[0212] The upper power transmission housing 20a has a wall portion 186 in front of the front wall 184. The wall portion 186 protrudes downward from the upper inner surface of the upper power transmission housing 20a relative to the adjacent portion. When viewed from the rear, the wall portion 186 is semi-circular and surrounds the slider 6.

[0213] The upper power transmission housing 20a has a left hole 188L and a right hole 188R between the front wall 184 and the wall portion 186. The left hole 188L is located on the left side of the protrusion 180. The right hole 188R is located on the right side of the protrusion 180.

[0214] When exhaust air W1 enters the left hole 188L from above through gap 181L, it flows forward on the near-front side of the left hole 188L. Therefore, without wall portion 186, exhaust air W1 flows towards the blade holder 138 after entering the left hole 188L (refer to exhaust air W2). Similarly, when exhaust air W1 enters the right hole 188R from above through gap 181R, it flows forward on the near-front side of the right hole 188R. Therefore, without wall portion 186, exhaust air W1 flows towards the blade holder 138 after entering the right hole 188R.

[0215] In the reciprocating saw 1, the exhaust air W1 is branched into an exhaust air W2 that faces the blade holder 138 and an exhaust air W3 that does not face the blade holder 138 by the wall portion 186. That is, the gaps 181L and 181R between the front wall 184 and the wall portion 186, which are the first channels, are branched into a second channel 192 on the front side of the portion between the wall portion 186 and the slider 6 facing the blade holder 138 and a third channel 193 on the lower side between the front wall 184 and the wall portion 186.

[0216] In addition, the left hole 188L and the right hole 188R can be either not separated to the left and right, or they can be divided into three or more parts.

[0217] The lower power transmission housing 20b has a lower wall portion 196 that is symmetrical about the upper and lower sides of the wall portion 186. The lower wall portion 196 protrudes upward in an arc-shaped band from the lower inner surface of the lower power transmission housing 20b. The upper end of the lower wall portion 196 is in continuous contact with the lower end of the wall portion 186.

[0218] A front lower exhaust port 198, serving as a lower exhaust port, is provided at the lower part of the lower power transmission housing 20b and behind the lower wall portion 196. Figure 13 The lower part of the front wall 184 of the upper power transmission housing 20a is located behind the lower front exhaust port 198.

[0219] The lower wall portion 196 and the slider 6, as well as the wall portion 186 and the slider 6 together form the second channel 192.

[0220] The rear side of the lower wall portion 196 and the area between the front wall 184 and the wall portion 186 together form the third channel 193. The third channel 193 extends to the front lower exhaust port 198. The exhaust air W3 comes from the front lower exhaust port 198, passes through the gap of the guide shoe 8, contacts the lower inner surface of the cover 22, and is discharged forward from below the blade holder portion 138 (around the root of the guide shoe 8) to the outside.

[0221] A release mechanism 201 is disposed inside the power transmission housing 20 and on the front side of the wall portion 186 and the lower wall portion 196.

[0222] The release mechanism 201 is a mechanism that acts on the blade holder 138 to remove the blade.

[0223] The blade holding part 138 of the slider 6 has a push pin 210, a push pin compression spring 211, a guide sleeve 212, a holding pin 213, a holding pin compression spring 214, an auxiliary pin 215, a cam sleeve 216, a retaining ring 217, an auxiliary sleeve 218, and a torsion spring 219.

[0224] A slit 220, a first retaining pin hole 222, a first auxiliary pin hole 223 and a stepped portion 224 are formed at the front end of the slider body 136.

[0225] The slit 220 extends in the front-back and vertical directions. The slit 220 has a width (in the left-right direction) that is slightly larger than the thickness of the blade.

[0226] The first retaining pin hole 222 is located on the left side of the slit 220 and communicates with the slit 220. The first retaining pin hole 222 extends in the left-right direction.

[0227] The first auxiliary pin hole 223 is located on the right side of the slit 220 and communicates with the slit 220. The first auxiliary pin hole 223 extends in a left-right direction. The first auxiliary pin hole 223 faces the first retaining pin hole 222. A rib is formed on the left side of the center of the first auxiliary pin hole 223, protruding radially inward relative to other parts.

[0228] The outer diameter of the front end of the slider body 136 is smaller than the outer diameter of the rear part, and a stepped portion 224 is formed in the part where the outer diameter of the slider body 136 changes.

[0229] The push rod 210 is disposed within the slit 220 and located in the central part of the slit 220 in the vertical direction. The push rod 210 extends in the front-to-back direction. The cross-section of the push rod 210 is "D" shaped.

[0230] A compression spring 211 for the push rod is disposed within the slit 220 and located in the central portion of the slit 220 in the vertical direction. The compression spring 211 is an elastic body and is a helical spring. The compression spring 211 is positioned behind the push rod 210. The rear end of the compression spring 211 contacts the torsion spring 219. The front end of the compression spring 211 contacts the push rod 210. The compression spring 211 is clamped between the push rod 210 and the sliding body 136. The compression spring 211 applies a force forward to the push rod 210.

[0231] The guide sleeve 212 is cylindrical. The guide sleeve 212 is disposed on the outer side of the front end of the sliding body 136. The axial direction of the guide sleeve 212 is the front-to-back direction.

[0232] In addition, the guide sleeve 212 has a second retaining pin hole 226 and a second auxiliary pin hole 228 in the central part.

[0233] The second retaining pin hole 226 is located on the left side of the guide sleeve 212. The second retaining pin hole 226 extends in the left-right direction. The second retaining pin hole 226 overlaps with the first retaining pin hole 222. The diameter of the second retaining pin hole 226 is greater than the diameter of the first retaining pin hole 222.

[0234] The second auxiliary pin hole 228 is located on the right side of the guide sleeve 212. The second auxiliary pin hole 228 extends in the left-right direction. The second auxiliary pin hole 228 faces the second retaining pin hole 226. The diameter of the second auxiliary pin hole 228 is the same as the diameter of the portion of the rib on the left side of the first auxiliary pin hole 223.

[0235] A retaining pin 213 is disposed inside the first retaining pin hole 222 and the second retaining pin hole 226. The retaining pin 213 is cylindrical and extends in the left-right direction. The diameter of the central portion of the retaining pin 213 is the same as the size of the left portion of the first retaining pin hole 222. The diameter of the left end of the retaining pin 213 decreases relative to the diameters of the other portions. Therefore, a step (stepped pin) is formed at the left end of the retaining pin 213. The left end of the retaining pin 213 has a pointed shape that tapers towards the left. Furthermore, the diameter of the right end of the retaining pin 213 increases relative to the diameters of the other portions, making the right end of the retaining pin 213 a head with an enlarged diameter compared to the other portions. The right surface of the retaining pin 213 is formed as a curved surface that bulges to the right.

[0236] The retaining pin compression spring 214 is an elastic body and is a helical spring. The left end of the retaining pin compression spring 214 contacts the enlarged diameter portion of the first retaining pin hole 222. The right end of the retaining pin compression spring 214 contacts the left surface of the head of the retaining pin 213. The retaining pin compression spring 214 is clamped between the retaining pin 213 and the sliding body 136. The retaining pin compression spring 214 applies a force to the left on the retaining pin 213.

[0237] An auxiliary pin 215 is disposed inside the first auxiliary pin hole 223 and the second auxiliary pin hole 228. The auxiliary pin 215 is cylindrical and extends in the left-right direction. The right end of the auxiliary pin 215 can contact the rib of the first auxiliary pin hole 223. The diameter of the auxiliary pin 215, the diameter of the right side of the first auxiliary pin hole 223, and the diameter of the second auxiliary pin hole 228 are the same. The auxiliary pin 215 connects the sliding body 136 and the guide sleeve 212.

[0238] The cam sleeve 216 is cylindrical. The axial direction of the cam sleeve 216 is front-to-back. The cam sleeve 216 is positioned outside the guide sleeve 212, the retaining pin 213, and the auxiliary pin 215. The cam sleeve 216 is rotatable around the slider body 136 and the guide sleeve 212. A protrusion is formed from the upper part to the left of the cam sleeve 216. The protrusion extends radially outward relative to the rest of the cam sleeve 216. A cam surface 216C is formed on the inner surface of the protrusion. Viewed from the front, the diameter of the cam surface 216C gradually increases as it moves counterclockwise from the upper part. The curved surface of the head of the retaining pin 213 contacts the cam surface 216C. When the blade holder 138 is not bearing a blade, the head of the retaining pin 213 contacts the side of the cam surface 216C closest to its maximum diameter. When the blade holder 138 is bearing a blade, the head of the retaining pin 213 contacts the side of the cam surface 216C closest to its minimum diameter. Furthermore, the cam sleeve 216 has a protrusion 234 that projects radially outward. The protrusion 234 is located on the right side of the cam sleeve 216.

[0239] The retaining ring 217 is annular. The retaining ring 217 is fixed to the outside of the guide sleeve 212. The retaining ring 217 is positioned on the front side of the cam sleeve 216 to prevent the cam sleeve 216 from moving forward.

[0240] The auxiliary sleeve 218 is cylindrical. The axial direction of the auxiliary sleeve 218 is front-to-back. The auxiliary sleeve 218 is disposed on the outer side of the slider body 136 and can rotate around the slider body 136. The auxiliary sleeve 218 is disposed on the front side of the stepped portion 224. The stepped portion 224 prevents the auxiliary sleeve 218 from moving rearward. The front end of the auxiliary sleeve 218 is inserted into the inner side of the opening at the rear end of the cam sleeve 216 and is connected to the rear end of the cam sleeve 216. The auxiliary sleeve 218 rotates together with the cam sleeve 216.

[0241] The torsion spring 219 is annular and is an elastic body. The rear end of the torsion spring 219 extends vertically from the center in the left-right direction into the slit 220. The rear end of the torsion spring 219 is positioned between the bottom of the rear end of the slit 220 and the rear end of the push rod compression spring 211. The rear end of the torsion spring 219 is fixed to the slider body 136. The portion of the torsion spring 219, excluding the rear end, is positioned around the front end of the slider body 136 on the rear side of the auxiliary sleeve 218. The front end of the torsion spring 219 is inserted into a hole in the auxiliary sleeve 218 in the front-rear direction and is fixed to the auxiliary sleeve 218. The torsion spring 219 applies a force to the auxiliary sleeve 218 circumferentially in a counter-clockwise direction when viewed from the front.

[0242] The blade has a retaining hole at its rear end. The diameter of the retaining hole is slightly larger than the diameter of the right end of the retaining pin 213. Additionally, the corner of the rear end of the blade opposite to the cutting edge is removed. The portion of the rear end of the blade on the same side as the cutting edge protrudes rearward, forming a protruding piece. The rear edge above the protruding piece in the blade forms a shoulder. Furthermore, the blade has a protrusion at its rear end.

[0243] If the rear end of the blade does not enter the slit 220, the front end of the push rod 210 enters the left side of the retaining pin 213. The retaining pin 213 moves to the right and enters the retracted state.

[0244] Furthermore, when the rear end of the blade enters the slit 220, the push rod 210 is pushed backward by the shoulder of the blade against the force exerted by the compression spring 211.

[0245] When the rear end of the blade moves further rearward, positioning the blade's retaining hole to the left of the retaining pin 213, the cam surface 216C of the cam sleeve 216 pushes the retaining pin 213 to the left against the force applied by the compression spring 214. That is, the cam sleeve 216 is stressed by the torsion spring 219 via the auxiliary sleeve 218. The direction of the force applied by the torsion spring 219 is counterclockwise when viewed from the front. Furthermore, when the blade's retaining hole is to the left of the retaining pin 213 and the retaining pin 213 can move to the left, the cam sleeve 216 rotates counterclockwise when viewed from the front. Thus, the curved surface of the retaining pin 213 contacts the further inwardly extending portion (the portion with a further reduced diameter) of the cam surface 216C. Therefore, the retaining pin 213 is pushed to the left by the cam surface 216C.

[0246] The portion of the retaining pin 213 that is pushed to the left, which is further to the left of the step, enters the retaining hole of the blade to retain the blade.

[0247] Therefore, the blade can be automatically held (one-click installation) simply by inserting it into the slit 220.

[0248] The guide sleeve 212 is fixed to the sliding body 136 by an auxiliary pin 215, which is different from the retaining pin 213, to prevent its movement in the front-to-back direction and to prevent rotation. In addition, the retaining pin 213 is disposed in the first retaining pin hole 222 with an expanded diameter on the right side.

[0249] The release mechanism 201 has a release drum 240 and a tension spring 242.

[0250] The release drum 240 is cylindrical and housed within the power transmission housing 20. The wall portion 186 inhibits rearward movement of the release drum 240. The release drum 240 is adjacent to the blade holder 138. The release drum 240 is positioned around the cam sleeve 216. The release drum 240 is operated by the user to remove (release) the blade from the blade holder 138.

[0251] The release drum 240 has an inner bulge 248 and an operating plate 250.

[0252] An inner bulge 248 is disposed on the inner surface of the release drum 240 and protrudes radially inward compared to other portions of the inner surface of the release drum 240. The inner bulge 248 is disposed on the right side of the release drum 240.

[0253] An operating plate 250 is disposed on the right side of the release drum 240. The operating plate 250 protrudes radially outward relative to the other outer surfaces. As shown in the solid line illustration, the operating plate 250 extends from the upper left to the lower right and expands back and forth. The operating plate 250 is integrally formed with the other parts of the release drum 240 (the cylindrical release drum body). The operating plate 250 extends to the right from the first operating plate hole 252 provided on the power transmission housing 20 and the second operating plate hole 254 provided on the cover 22.

[0254] The tension spring 242 is a helical spring. The tension spring 242 is disposed circumferentially outside the release drum 240 and extends circumferentially along the release drum 240. The tension spring 242 is disposed within the power transmission housing 20.

[0255] The first end of the tension spring 242 has a hook shape and is locked to the release drum 240. The second end of the tension spring 242 has a hook shape and is fixed to the lower power transmission housing 20b.

[0256] When the tension spring 242 is slightly extended from its natural length, the inner bulge 248 of the release drum 240 is released. Figure 12 The solid line in the middle is not aligned with the protrusion 234 of the cam sleeve 216 in the blade holding state. Figure 12The single-dot dashed line in the diagram makes contact. At this time, the operating plate 250 of the release drum 240 contacts the lower ends of the first operating plate hole 252 and the second operating plate hole 254. Alternatively, the tension spring 242 can be in other states such as its natural length state at this time.

[0257] The user can operate the lower operating piece 250 upwards, causing the release drum 240 to rotate about its front-to-back axis against the force of the tension spring 242. In this situation, as the release drum 240 rotates, the inner bulge 248 ( Figure 12 The single-dot dashed line in the image contacts the corresponding protrusion 234 of the cam sleeve 216, causing the cam sleeve 216 to rotate clockwise when viewed from the front. Through this rotation of the cam sleeve 216, the head of the retaining pin 213 is positioned inside the larger diameter portion of the cam surface 216C. The retaining pin 213 is retracted to the left by the force of the retaining pin compression spring 214, exiting the retaining hole of the blade (releasing the retaining). Then, the push rod 210 moves forward by the force of the push rod compression spring 211, pushing the released blade forward and into the left side of the retaining pin 213.

[0258] Therefore, the release drum 240 of the release mechanism 201 is linked with the inner blade holding part 138, and the blade is released by operating the operation plate 250 upwards, disengaging from the blade holding part 138.

[0259] When push rod 210 enters the right side of retaining pin 213, the movement of retaining pin 213 to the right is prevented. Therefore, retaining pin 213 resists the counterclockwise force when viewed from the front of torsion spring 219, preventing cam sleeve 216 from rotating counterclockwise when viewed from the front.

[0260] Alternatively, the operating drum can replace the blade release operation, or be used together with the blade release operation for blade installation.

[0261] The exhaust air W2 toward the blade holder 138 is discharged outward and forward through the space between the release drum 240 and the slider 6.

[0262] The action of this reciprocating saw 1 will be explained using an example.

[0263] The user places the blade in the blade holder 138 of the slider 6 in the stopped state. Typically, the blade is set with the cutting edge (acting part) facing down so that it acts on the workpiece from above. However, sometimes the blade is set with the cutting edge facing up, for example, when the blade acts on the workpiece from below.

[0264] The user adjusts the length of the guide shoe 8 appropriately so that the front surface of the guide shoe 8 contacts the workpiece. Furthermore, the user installs the charged battery 54 into the battery mounting section 50. Additionally, the user operates the speed switch dial 36 to select the speed.

[0265] Then, when the user holds the first grip portion 30 (and the second grip portion 60) and pulls the trigger 33 to a predetermined position, the main switch body 34 is turned on, supplying power to the motor 3, and the motor shaft 80 rotates. The power supply to the motor 3 is provided by a DC power supply rectified by the controller 40. Additionally, when the trigger 33 is pulled to a certain position or more, the lamp 62 illuminates. This certain position is less than the predetermined amount of power supplied to the motor 3.

[0266] The microcomputer of the controller 40 obtains the rotational state of the rotor 72 from the sensor board 75. Furthermore, based on the obtained rotational state, the microcomputer of the controller 40 controls the switching elements to open and close, and sequentially flows current through each coil 73 of the stator 71, thereby causing the rotor 72 to rotate. Generally, the controller 40 of the brushless motor 3 may generate heat due to the driving action of the microcomputer, etc. Moreover, if heat accumulates in the controller 40, it may sometimes affect the operation of the controller 40.

[0267] The motor shaft 80 rotates at a speed corresponding to the signal (trigger 33 engagement amount) of the main switch body 34 when it is in the ON state. The greater the engagement amount of the trigger 33, the higher the rotation speed of the motor shaft 80. In addition, the maximum rotation speed of the motor shaft 80 is controlled by the controller 40 to a speed corresponding to the rotation state of the speed switching dial 36.

[0268] When the motor shaft 80 rotates, the crank cam 108 rotates via the bevel gear 100, torque limiting mechanism 102, intermediate shaft 104, and crank base 106, causing the slider 6 to move back and forth. Additionally, the balancer 144 moves in the opposite direction to the slider 6 in the back-and-forth direction, allowing the slider 6 to move back and forth while vibration is suppressed.

[0269] The slider 6 is guided in a direction other than that of the slider support body 150, which is suppressed by the front and rear oilless bearings 151.

[0270] When the user moves the knob 174 of the trajectory switching handle 170 forward (see reference) Figure 1 (Double-dotted line in the middle), the second plane 178 of the operating handle body 172 is in a state of extending forward, backward and left and right directions (refer to the double-dotted line in the middle). Figure 8Furthermore, the second plane 178 separates from the rear plate 152. The bearing 156 of the trajectory mechanism 12 follows the cam surface 130a of the crank cam 108 for a full circumference, causing the slider support body 150 to oscillate in accordance with the reciprocating motion of the slider 6. Therefore, the trajectory motion is completed in the entire reciprocating motion of the slider 6 (second trajectory state).

[0271] Additionally, when the user pushes the knob 174 of the trajectory switching handle 170 backward (see reference), Figure 1 When the solid line in the middle is in the position, the first plane 176 of the operating handle body 172 is in a state of extending in the forward, backward, left and right directions (refer to the solid line in the middle). Figure 7 And the rear plate 152 is in a liftable state. The bearing 156 of the trajectory mechanism 12 only follows the cam surface 130a of the crank cam 108 for about half a revolution, and only for about half a revolution coincides with the reciprocating motion of the slider 6 to make the slider support body 150 swing. During the remaining about half revolution, it does not contact the cam portion 130 and maintains the posture of the slider support body 150. Therefore, the trajectory motion occurs in about half of the reciprocating motion of the slider 6 (first trajectory state).

[0272] When the user moves the blade downward toward the workpiece while the slider 6 or the blade is in motion, the cutting edge of the blade, which moves back and forth, contacts the workpiece, thereby cutting the workpiece.

[0273] The second trajectory state is suitable for cases where the workpiece is, for example, wood. Conversely, the first trajectory state is suitable for cases where the workpiece is, for example, metal.

[0274] Furthermore, the fan 4 rotates along with the motor shaft 80, thereby pushing the air around the fan 4 radially outward. Therefore, the airflow (wind) is generated by passing through the motor housing 18 from each air inlet 31 to the fan 4, and then to the exhaust port 56 and each lower exhaust port 48 of the main body. That is, exhaust winds WD, WL, WR, W1 to W3, etc., are generated.

[0275] The various components inside the main body shell 2 are cooled by this wind.

[0276] In particular, the motor 3 is cooled by the air intake from each air intake 31 to the fan 4. The air intake passes between the stator 71 and the rotor 72, cooling both the stator 71 and the rotor 72. In addition, the air intake passes through the interior of the stator 71, cooling the stator 71.

[0277] In addition, the exhaust air WL and WR from the fan 4 to the exhaust vents 56 of each main body passes through the outside of the power transmission housing 20. Therefore, the exhaust air WL and WR cools the power transmission housing 20 and the components inside it.

[0278] Furthermore, the controller 40 is cooled by exhaust air WD from the fan 4 to each lower exhaust port 48. The exhaust air WD passes over the controller housing 44 side covering the control circuit board 42. Therefore, the exhaust air WD adequately cools the control circuit board 42.

[0279] Furthermore, exhaust air W1 passes above the power transmission housing 20, exhaust air W2 passes radially inside the release drum 240, and exhaust air W3 passes in front of the power transmission housing 20. Therefore, the power transmission housing 20, its internal components, and the components in front of it are cooled by exhaust air W1 to W3. Moreover, since exhaust air W1 branches into exhaust air W2 and W3, the airflow of exhaust air W2 towards the blade holder 138 can be suppressed compared to the case where it is not branched. Therefore, dust generated on the workpiece can be suppressed. Exhaust air W3 ultimately faces forward, but not towards the blade holder 138; instead, it faces forward around the guide shoe 8 below it. Since it does not face the blade holder 138, dust generated on the workpiece can be suppressed.

[0280] When the user disconnects the main switch body 34 by operating trigger 33, the motor shaft 80 of motor 3 stops, thereby stopping all forward and backward movements, as well as air intake and exhaust. Additionally, after a predetermined time, the light 62 turns off.

[0281] Furthermore, the methods and modifications of the present invention are not limited to those described above. For example, the following modifications may be suitably implemented to further modify the methods and modifications of the present invention.

[0282] The orbital movement of the blade holder 138 and the like is not limited to elliptical or semi-elliptical shapes. For example, the orbital movement can be a reciprocating motion (oscillating motion) on an imaginary semi-elliptical arc.

[0283] The first plane 176 may not be a continuous plane including the first portion 176a and the second portion 176b. For example, the first plane 176 may have a first portion 176a as a plane and a second portion 176b as a plane away from the first portion 176a, by which the slider 6 is directly or indirectly supported. At least one of the first portion 176a and the second portion 176b may be a protrusion protruding relative to the surrounding portion.

[0284] The cam portion 130 can be arc-shaped, straight, or curved when viewed from above. The cam portion 130 can be disposed on the lower surface of the crank cam 108. The cam portion 130 can be separately disposed from the crank cam 108.

[0285] A portion or all of the reciprocating motion conversion mechanism 5 and at least one of the trajectory switching mechanism 14 (trajectory switching operation handle 170) may be configured above the slider support 161.

[0286] The reciprocating motion conversion mechanism 5 can replace the mechanism (horizontal crank type) that uses a crank cam 108 extending in the front-back and left-right directions, and can be set as a mechanism (connecting rod type) that uses a crank and a connecting rod. It can also be set as a mechanism (rocker type) that uses a rotating body with an inclined cylindrical surface and a rocker bearing provided on the inclined cylindrical surface.

[0287] The main body exhaust port 56 can be configured in the portion of the cover 22 that is forward of the reciprocating motion conversion mechanism 5. The main body exhaust port 56 can be configured in the power transmission housing 20. The lower exhaust port 48 can be configured on the outside of the controller 40.

[0288] Cover 22 can be a semi-divided component with a left cover and a right cover.

[0289] Various changes can be made to the presence, quantity, material, shape, form, and configuration of various components. For example, a needle bearing can be used instead of a ball bearing, or a ball bearing can be used instead of a needle bearing. Or at least one of the torque limiting mechanism 102 and the intermediate shaft 104 can be omitted. Or the size, configuration, and quantity of at least one of the air inlet 31, the main body exhaust port 56, and the lower exhaust port 48 can be changed. Or the installation and removal direction of the battery 54 can be changed from the front and rear direction. Or the number of batteries 54 that can be installed can be changed to multiple, etc.

[0290] The tip tool can be any tool other than a blade.

[0291] It can replace the power supply provided by battery 54, and be powered by leads. The leads can be connected to a commercial power supply.

[0292] The present invention and its modifications can be applied to reciprocating cutting tools other than reciprocating saws (e.g., wire saws), as well as to reciprocating tools other than reciprocating cutting tools, power tools, gardening tools, and electric work machines.

[0293] [Method 2]

[0294] Figure 15A This is a central longitudinal sectional view of the main part of the reciprocating saw involved in the second aspect of the present invention, and is a view of the highest point 130a2 of the cam surface 130a in the first-1 trajectory state when it is located at the rearmost position. Figure 15B yes Figure 15AThe central longitudinal section view of the main part of the reciprocating saw, and the diagram showing the lowest point 130a1 of the cam surface 130a in the first-1 trajectory state when it is in the rearmost position.

[0295] Figure 16A yes Figure 15A The diagram shows the central longitudinal section of the main part of the reciprocating saw, and is a diagram of the highest point 130a2 of the cam surface 130a in the first-second trajectory state when it is in the rearmost position. Figure 16B yes Figure 16A The diagram shows the central longitudinal section of the main part of the reciprocating saw, and is a diagram of the lowest point 130a1 of the cam surface 130a in the first-second trajectory state when it is in the rearmost position.

[0296] Figure 17A yes Figure 15A The diagram shows the central longitudinal section of the main part of the reciprocating saw, and is a diagram of the highest point 130a2 of the cam surface 130a in the second trajectory state when it is in the rearmost position. Figure 17B yes Figure 17A The diagram shows the central longitudinal section of the main part of the reciprocating saw, and is a diagram of the lowest point 130a1 of the cam surface 130a in the second trajectory state when it is in the rearmost position.

[0297] The reciprocating saw of the second type is the same as the reciprocating saw of the first type, except for the main body of the trajectory switching operation handle (and its positional relationship with the cam surface 130a in the vertical direction). The same reference numerals are used for parts and components identical to those in the reciprocating saw of the first type, and descriptions are appropriately omitted.

[0298] The operating handle body 272 of the trajectory switching operating handle 270 of the second method has: a first plane 276 extending in the left-right direction as a first support surface; a second plane 277 extending in the left-right direction as a second support surface; and a third surface 278 extending in the left-right direction as a surface for the second trajectory state.

[0299] A predetermined angle (approximately 100° in this case) is formed between the first plane 276 and the second plane 277. A specific angle (approximately 100° in this case) is formed between the second plane 277 and the third surface 278.

[0300] The distance from the central axis C to the first plane 276 is greater than the distance from the central axis C to the second plane 277. The distance from the central axis C to the second plane 277 is greater than the distance from the central axis C to the third surface 278.

[0301] In the state of trajectory 1-1 Figure 15A , Figure 15BIn this case, the trajectory switching operation handle 270 is in a state where the first plane 276 is always in contact with the lower rear part (the rear plate 152) of the slider bracket 161.

[0302] That is, such as Figure 15A As shown, when the highest point 130a2 in the cam surface 130a is located at the rearmost position, the first plane 276 supports the lower rear part of the slider bracket 161, and the cam surface 130a does not contact the slider bracket 161 (bearing 156). Furthermore, as... Figure 15B As shown, when the lowest point 130a1 in the cam surface 130a is at the rearmost position, the first plane 276 supports the lower rear part of the slider bracket 161, and the cam surface 130a does not contact the slider bracket 161. Therefore, in the first-1 trajectory state, the trajectory movement of the blade holder 138 does not occur within the entire range of the reciprocating motion; the blade holder 138 reciprocates linearly in the front-rear direction.

[0303] In this case, the first plane 276 spans both sides of an imaginary vertical plane V that includes the central axis C and is perpendicular to the first plane 176 in the front-back direction. That is, the first plane 276 spans the vertical plane V. In other words, the first plane 276 has a first part 276a that is forward of the central axis C (vertical plane V) and a second part 276b that is rearward of the central axis C (vertical plane V).

[0304] In the first two trajectory states Figure 16A , Figure 16B In this case, the trajectory switching handle 270 becomes a state in which the second plane 277 can contact the lower rear part of the slider bracket 161.

[0305] That is, such as Figure 16A As shown, when the highest point 130a2 in the cam surface 130a is located at the rearmost position, the cam surface 130a contacts the slider support 161 (bearing 156), and the second plane 277 is away from the lower rear part of the slider support 161. Furthermore, as... Figure 16B As shown, when the lowest point 130a1 in the cam surface 130a is at the rearmost position, the second plane 277 supports the lower rear part of the slider bracket 161, and the cam surface 130a does not contact the slider bracket 161. Furthermore, in the first-second trajectory state, similar to the first trajectory state in the first method, the trajectory movement of the blade holder 138 does not occur within approximately half of the reciprocating motion; the blade holder 138 reciprocates along a semi-elliptical trajectory.

[0306] In this case, the second plane 277 spans both sides of the imaginary vertical plane V, which includes the central axis C and is perpendicular to the second plane 277, in the front-back direction. That is, the second plane 277 spans the vertical plane V. In other words, the second plane 277 has a first part 277a that is forward of the central axis C (vertical plane V) and a second part 277b that is rearward of the central axis C (vertical plane V).

[0307] On the other hand, in the second trajectory state Figure 17A , Figure 17B In this case, the trajectory switching handle 270 is positioned such that the third surface 278 faces the lower rear part of the slider bracket 161 at a distance.

[0308] That is, such as Figure 17A As shown, when the highest point 130a2 of the cam surface 130a is at its rearmost position, the cam surface 130a contacts the slider support 161 (bearing 156), and the third surface 278 is away from the lower rear part of the slider support 161. Furthermore, as... Figure 17B As shown, when the lowest point 130a1 of the cam surface 130a is at its furthest point, the cam surface 130a contacts the slider support 161, and the third surface 278 moves away from the lower rear part of the slider support 161. That is, the bearing 156 of the slider support 161 contacts the entire outer periphery of the cam surface 130a. Therefore, in the second trajectory state, the trajectory movement of the blade holder 138 is performed throughout the entire reciprocating motion range, and the blade holder 138 reciprocates along an elliptical trajectory.

[0309] Furthermore, the diameter of the trajectory switching handle 170 at the portion of the third surface 278 facing the screw 160 is smaller than the diameter of the adjacent portion, thereby avoiding interference between the trajectory switching handle 170 and the screw 160. The portion of the third surface 278 facing the screw 160 is recessed in a manner that avoids the screw 160.

[0310] The reciprocating saw involved in the second method suitably has the same modifications as the reciprocating saw 1 in the first method.

[0311] Furthermore, the operating handle body 272 in the reciprocating saw involved in the second method can have more than three support surfaces.

[0312] [Method 3]

[0313] Figure 18 The reciprocating saw involved in the third aspect of the present invention and Figure 11 Same diagram. Figure 19 The reciprocating saw involved in the third aspect of the present invention and Figure 14 Same diagram.

[0314] The reciprocating saw according to the third aspect of the present invention is identical in structure to the reciprocating saw 1 of the first aspect, except for the structure of the wall portion, lower wall portion and its surrounding area in the power transmission housing, and the presence or absence of the second channel 192 (exhaust air W2). The same reference numerals are used for parts and components identical to those in the reciprocating saw 1 of the first aspect, and descriptions are appropriately omitted.

[0315] The protrusion height of the wall portion 386 of the upper power transmission housing 320a in the reciprocating saw according to the third embodiment is higher than the protrusion height of the wall portion 186 in the first embodiment. Similarly, the protrusion height of the lower wall portion 396 of the lower power transmission housing 320b in the reciprocating saw according to the third embodiment is higher than the protrusion height of the lower wall portion 196 in the first embodiment. In addition, the protrusion height of at least one of the wall portion 386 and the lower wall portion 396 is not limited to the above-described cases.

[0316] Furthermore, an elastic (rubber) ring 397 is sandwiched between the wall portion 386 and the lower wall portion 396. The ring 397 extends in the vertical and horizontal directions. A groove 397a is formed around the ring 397. The groove 397a is recessed radially inward relative to its front and rear sides. The wall portion 386 enters the upper part of the groove 397a. The lower wall portion 396 enters the lower part of the groove 397a. The ring 397 is held by the wall portion 386 and the lower wall portion 396. A hole 397b is provided in the center of the ring 397.

[0317] In a state that allows the slider 6 to reciprocate, the portion from the front side of the left hole 188L and the right hole 188R to the front side of the front lower exhaust hole 198 is blocked by the wall portion 386, the lower wall portion 396, and the ring 397. The slider body 136 enters in a state of contact with the hole 397b. Therefore, the second channel 192 (exhaust air W2) facing forward (towards the blade holder 138) is essentially non-existent in the third embodiment. In addition, the third channel 393 in the third embodiment is formed by the wall portion 386, the lower wall portion 396, the ring 397, and the front wall 184 of the upper power transmission housing 20a behind it. The third channel 393 is a channel that reaches the outside of the reciprocating saw without facing the blade holder 138. The gaps 181L and 181R (first channels) are only connected to the third channel 393. Within the third channel 393, the exhaust air W1 from the left hole 188L and the right hole 188R becomes the exhaust air W3, which is not branched and does not face the blade holder 138 side.

[0318] In the third configuration, exhaust air W1 passes above the power transmission housing 20, exhaust air W2 passes almost non-existently on the radially inner side of the release drum 240, and exhaust air W3 passes vertically through the front of the power transmission housing 20 via the third channel 393. Therefore, exhaust air W1 and W3 cool the power transmission housing 20 and its internal components. Furthermore, since exhaust air W1 becomes exhaust air W3 that does not face the blade holder 138 side, the airflow of exhaust air W2 facing the blade holder 138 side can be suppressed compared to the non-branched case. Therefore, dust generated on the workpiece can be suppressed. Exhaust air W3 ultimately faces forward, but not towards the blade holder 138, but rather towards the periphery of the guide shoe 8 below it. Since it does not face the blade holder 138 side, dust generated on the workpiece can be suppressed.

[0319] The reciprocating saw involved in the third method appropriately has the same variant as at least one of the first and second methods.

Claims

1. A reciprocating cutting tool characterized by comprising: a motor having a stator and a rotor; a reciprocating conversion mechanism driven by the motor; a rod-shaped slide connected to the reciprocating conversion mechanism and performing reciprocating motion; a tip tool holding portion held at a front end of the slide and holding a tip tool; a power transmission housing accommodating the reciprocating conversion mechanism, from a front end of which the slide protrudes; a cover disposed outside the power transmission housing; a fan capable of rotating integrally with the rotor; and a lamp illuminating a front of the tip tool holding portion, a first passage of cooling air of the fan being provided between the power transmission housing and the cover, the first passage being branched into a second passage toward the tip tool holding portion side and a third passage not toward the tip tool holding portion side, a direction in which the slide extends being set as a front-rear direction, the first passage being divided into two by a protrusion portion that accommodates a lead wire of the lamp and extends in the front-rear direction.

2. The reciprocating cutting tool according to claim 1, characterized in that the third passage includes holes opened in the power transmission housing, the holes being two and disposed on both sides of the protrusion portion.

3. The reciprocating cutting tool according to claim 1, characterized in that the third passage includes a wall portion provided to the power transmission housing.

4. The reciprocating cutting tool according to claim 3, characterized in that the wall portion is in a circular arc band shape.

5. The reciprocating cutting tool according to claim 1 or 4, characterized in that a direction in which the tip tool acts is set as an up-down direction, the first passage being disposed between an upper portion of the power transmission housing and an upper portion of the cover.

6. The reciprocating cutting tool according to claim 5, characterized in that the third passage includes an upper exhaust hole provided to the upper portion of the power transmission housing.

7. The reciprocating cutting tool according to claim 5, characterized in that the third passage includes a lower exhaust hole provided to a lower portion of the power transmission housing.

8. The reciprocating cutting tool according to claim 1, characterized in that a direction in which the tip tool acts is set as an up-down direction, the power transmission housing having an upper power transmission housing and a lower power transmission housing located below the upper power transmission housing.

9. The reciprocating cutting tool according to claim 8, characterized in that the third passage includes an upper wall portion formed in the upper power transmission housing.

10. The reciprocating cutting tool according to claim 9, characterized in that the third passage includes a lower wall portion formed in the lower power transmission housing.

11. The reciprocating cutting tool according to claim 10, characterized in that a lower end portion of the upper wall portion and an upper end portion of the lower wall portion are continuously joined.

12. The reciprocating cutting tool according to claim 9, characterized in that the upper wall portion is in a circular arc band shape. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 13. The reciprocating cutting tool according to claim 10, wherein the lower wall portion is a circular arc band.

14. A reciprocating cutting tool, comprising: a motor having a stator and a rotor; a reciprocating motion conversion mechanism driven by the motor; a rod-shaped slide connected to the reciprocating motion conversion mechanism and reciprocating; a tip tool holding portion held at a front end of the slide and holding a tip tool; a power transmission housing accommodating the reciprocating motion conversion mechanism, the slide protruding from a front end of the power transmission housing; a cover disposed outside the power transmission housing; a fan rotatable integrally with the rotor; and a lamp illuminating a front of the tip tool holding portion, a first passage of cooling air of the fan is provided between the power transmission housing and the cover, the first passage is connected to a passage not reaching the outside toward the tip tool holding portion side, an extending direction of the slide is set as a front-rear direction, the first passage is divided into two by a protrusion portion accommodating a lead wire of the lamp and extending in the front-rear direction.

15. The reciprocating cutting tool according to claim 14, wherein an acting direction of the tip tool is set as an up-down direction, and the first passage is provided between an upper portion of the power transmission housing and an upper portion of the cover.

16. The reciprocating cutting tool according to claim 14, wherein an acting direction of the tip tool is set as an up-down direction, the power transmission housing has an upper power transmission housing and a lower power transmission housing located below the upper power transmission housing.

17. A reciprocating cutting tool, comprising: a motor having a stator and a rotor; a reciprocating motion conversion mechanism driven by the motor; a rod-shaped slide connected to the reciprocating motion conversion mechanism and reciprocating; a tip tool holding portion held at a front end of the slide and holding a tip tool; a power transmission housing accommodating the reciprocating motion conversion mechanism, the slide protruding from a front end of the power transmission housing; a cover disposed outside the power transmission housing; a fan rotatable integrally with the rotor; and a cylindrical release drum for releasing the tip tool held by the tip tool holding portion, a first passage of cooling air of the fan is provided between the power transmission housing and the cover, the first passage is branched into a second passage toward the tip tool holding portion side and a third passage not toward the tip tool holding portion side, the second passage is disposed at a radially inner side of the release drum. ​ ​ ​

Images