Reciprocating cutting tool

Abstract

To provide a reciprocating cutting tool which is, with regard to positioning of a shoe thereof, excellent in durability, hard to move during an operation, and easy to operate, and which can certainly retain the shoe when drawing the same forward in comparison with a prescribed position.SOLUTION: A reciprocating saw as a reciprocating cutting tool comprises: a rod-like slider 6 with a blade holding part 138 which holds a blade; a shoe 229 which is adjacent to the blade holding part 138 and slidable in an extending direction (cross direction) of the slider 6; a shoe lock mechanism 254 which engagingly locks the shoe 229; and a pin 240 which can interfere with the shoe 229. The shoe lock mechanism 254 suppresses slide of the shoe 229 by locking the shoe 229, and allows slide of the shoe 229 by releasing the lock of the shoe 229. A pin 240 interferes with the shoe 229 slidden to the prescribed position.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a reciprocating cutting tool such as a rechargeable reciprocating saw.

Background Art

[0002] U.S. Patent No. 6,272,757 (Patent Document 1) and European Patent No. 0,669,181 (Patent Document 2) disclose a position-adjustable shoe in a reciprocating saw.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the positioning of the shoe related to the reciprocating cutting tool, a technique is expected that is more excellent in durability, is more difficult to move or easier to operate during work, and can more reliably prevent coming off when pulled out forward from a predetermined position such as the maximum withdrawal position.

Means for Solving the Problems

[0005] This specification discloses a reciprocating cutting tool. This reciprocating cutting tool may include a motor, a rod-shaped slider provided with a tip tool holder for holding a tip tool at its tip, and a reciprocating motion conversion mechanism that converts the rotation of the motor into a reciprocating motion in the front-rear direction and transmits it to the slider. The reciprocating cutting tool may include a shoe that is adjacent to the tip tool holder, can contact the workpiece on which the tip tool acts, and is slidable in the front-rear direction. The reciprocating cutting tool may include a shoe lock mechanism that can lock the shoe. The reciprocating cutting tool may include a pin that can interfere with the shoe. The shoe lock mechanism may suppress the sliding of the shoe by locking the shoe. The shoe lock mechanism may allow the sliding of the shoe by releasing the lock on the shoe. The pin may interfere with the shoe slid to a predetermined position.

Advantages of the Invention

[0006] According to the reciprocating cutting tool of the present disclosure, the positioning mechanism of the shoe is more excellent in durability. In addition, the positioned shoe is more difficult to move during work. Furthermore, the operation of positioning the shoe is easier. Moreover, the retaining is more reliably performed when the shoe is pulled forward from a predetermined position such as the maximum retracted position.

Brief Description of the Drawings

[0007]

Figure 1

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Figure 10

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Figure 16

DETAILED DESCRIPTION OF THE INVENTION

[0008] The reciprocating saw according to the present disclosure may include a motor, a rod-shaped slider having a blade holding portion for holding a blade provided at a tip portion thereof, a reciprocating conversion mechanism that converts the rotation of the motor into a reciprocating motion in the front-rear direction and transmits it to the slider, with the extending direction of the slider being the front-rear direction. The reciprocating saw may include a shoe that is adjacent to the blade holding portion, can contact a workpiece on which the blade acts, and is slidable in the front-rear direction. The reciprocating saw may include a shoe lock mechanism that can be locked to the shoe. The reciprocating saw may include a pin that can interfere with the shoe. The shoe lock mechanism may suppress the sliding of the shoe by locking to the shoe. The shoe lock mechanism may allow the sliding of the shoe by releasing the lock to the shoe. The pin may interfere with the shoe slid to a predetermined position. In this case, the prevention of the shoe from coming off when pulled forward from a predetermined position such as the frontmost slide position is made more reliable.

[0009] Also, the pin may be movable to a position where it does not interfere with the shoe by a pushing-up operation. The shoe may be separable from a portion other than the shoe when not locked by the shoe locking mechanism and not interfered with by the pin. In this case, the shoe can be separated while preventing the shoe from coming off. Furthermore, the pin may be biased to a position where it interferes with the shoe. In this case, the prevention of the shoe from coming off is made more reliable while enabling the separation of the shoe. Still further, the pin may be adjacent to the shoe locking mechanism. In this case, the locking operation of the shoe and the operation of the pin are easier to perform.

[0010] In addition, the shoe may have a shoe plate that contacts the workpiece and a shoe supporter that supports the shoe plate. The shoe supporter may have a slit extending in the front-rear direction. The pin may enter the slit. In this case, the shoe and the pin are arranged more compactly. Also, the slit may have a convex portion for narrowing its width. The pin may interfere with the convex portion. In this case, a configuration for preventing interference with the shoe is provided more efficiently. Furthermore, the shoe supporter may extend in the front-rear direction. The shoe supporter may have a bottom plate portion, a left wall portion rising from the left side of the bottom plate portion, and a right wall portion rising from the right side of the bottom plate portion. In this case, the shoe supporter is provided more firmly. Furthermore, the shoe lock mechanism may have a shoe supporter locking shaft that is cylindrical, having a flat surface portion and a cylindrical surface portion, and is rotatable around a central axis. At least one of the left wall portion and the right wall portion may have a portion to be locked that is locked to the cylindrical surface portion of the shoe supporter locking shaft. Due to the rotation of the shoe supporter locking shaft, the flat surface portion may face the portion to be locked, the cylindrical surface portion may disengage from the portion to be locked, and the locking of the shoe by the shoe supporter locking shaft may be released. In this case, the configuration for locking the shoe can be provided more efficiently. In addition, a shoe plate may be supported by at least one of the left wall portion and the right wall portion. In this case, the configuration of the shoe can be made more efficient.

[0011] Also, a shoe guide plate for guiding the shoe supporter may be provided. In this case, the configuration for sliding and more firmly holding the shoe can be provided more efficiently. Furthermore, the shoe guide plate may have a hole through which a pin passes. In this case, the configuration for the pin or its operation can be made more efficient. Furthermore, a power transmission housing for holding the reciprocating motion conversion mechanism may be provided. In addition, the shoe supporter may be disposed between the power transmission housing and the shoe guide plate. In this case, the shoe and its adjacent members can be provided more compactly. Also, the shoe guide plate may be fixed to the power transmission housing by screws. Also, the screws may pass through slits. In this case, the shoe and its adjacent members can be provided more compactly. Furthermore, the predetermined position may be the most forward position (the most forward slide position) where the shoe is locked to the shoe lock mechanism. In this case, when the shoe is pulled out to the most forward slide position, it is stopped by interference.

[0012] Hereinafter, embodiments of the present invention and modifications thereof will be described as appropriate with reference to the drawings. The present embodiment relates to a reciprocating cutting tool as an example of an electric tool and a reciprocating tool, and more specifically, to a reciprocating saw. The front-back, up-down, left-right directions in this embodiment and the modification examples are defined for convenience of explanation, and may change depending on at least one of the working conditions and the state of the moving member etc. Note that the present invention is not limited to this embodiment and the modification examples.

[0013] FIG. 1 is a perspective view of the reciprocating saw 1 according to the present disclosure as seen from the upper left front. FIG. 2 is a central longitudinal sectional view of FIG. 1. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 4 is a sectional view taken along line A-A of FIG. 3. In FIGS. 2 and 3, the right side of the figure is the front of the reciprocating saw 1, and the upper side of the figure is the upper side of the reciprocating saw 1.

[0014] The reciprocating saw 1 includes a main body housing 2, a motor 3, a fan 4, a reciprocating conversion mechanism 5, a slider 6 as an output part, a guide shoe mechanism 8, a counterweight mechanism 9, an orbital mechanism 12, an orbital switching mechanism 14, and a release mechanism 201 (see FIGS. 9, 13, 14, etc.).

[0015] The main body housing 2 is a support frame that directly or indirectly holds various members. The main body housing 2 includes a motor housing 18, a power transmission housing 20, and a cover 22.

[0016] The front part of the motor housing 18 is cylindrical. The rear part of the motor housing 18 is formed in a loop shape. The motor housing 18 is made of plastic. The motor housing 18 holds the motor 3 in the upper front part. The motor 3 has a motor case 3a. The motor case 3a is the outer shell of the motor 3. The motor case 3a is cylindrical. The front part of the motor case 3a is open. The motor housing 18 is connected to the power transmission housing 20 via the motor case 3a. The motor housing 18 is split in half and has a left motor housing 18a and a right motor housing 18b. The left motor housing 18a has a plurality of screw bosses 24. The right motor housing 18b has a plurality of screw holes (not shown). The arrangement of the screw holes corresponds to the arrangement of the screw bosses 24. The right motor housing 18b is fixed to the left motor housing 18a by inserting each of the plurality of screws 28 into the screw bosses 24 and the screw holes so as to extend in the left-right direction. The rear portion of the loop extending in the vertical direction in the motor housing 18 is the first grip portion 30. The first grip portion 30 is gripped by the user. A plurality of intake holes 31 are formed in a portion of the loop-shaped portion at the rear of the motor housing 18 that faces the front surface of the first grip portion 30. Each intake hole 31 extends in the left-right direction and is arranged in the vertical direction. The motor 3 is disposed on the front side of each intake hole 31.

[0017] A trigger switch 32 is held at the upper portion of the first grip portion 30. The trigger switch 32 has a trigger 33 and a trigger switch main body portion 34. The trigger 33 is exposed at the front side of the upper portion of the first grip portion 30. The user can perform an operation of pulling (moving rearward) the trigger 33 with a fingertip. The trigger 33 is disposed in front of the trigger switch main body portion 34. The trigger 33 is connected to the trigger switch main body portion 34. The trigger switch main body portion 34 is disposed inside the upper portion of the first grip portion 30. The trigger switch main body portion 34 is switched on and off by the operation of the trigger 33. The trigger switch main body portion 34 turns on when the amount of retraction of the trigger 33 is equal to or greater than a predetermined amount. Further, the trigger switch main body portion 34 transmits a signal (for example, a resistance value) that changes according to the amount of retraction equal to or greater than the predetermined amount. The rotational speed of the motor 3 changes according to this signal. The trigger 33 switches the on and off of the motor 3 via the trigger switch main body portion 34. The trigger 33 is a switch operation portion for operating the on and off of the motor 3.

[0018] Above the trigger 33, a lock-off button 35 is provided. The lock-off button 35 is plate-shaped and extends in the left-right direction. The left and right parts of the lock-off button 35 are exposed from the motor housing 18. The lock-off button 35 can slide to the right when its left part is pushed. Also, the lock-off button 35 can slide to the left when its right part is pushed. When the lock-off button 35 slides to the right and is positioned on the right side, it stops the pulling operation of the trigger 33. Therefore, the motor 3 cannot be turned on. When the lock-off button 35 slides to the left and is positioned on the left side, it allows the pulling operation of the trigger 33. Therefore, the motor 3 can be turned on.

[0019] In front of the lock-off button 35, a speed setting dial 36 is provided. The speed setting dial 36 is disk-shaped and extends in the up-down, left-right directions, and can be rotated. The upper part of the speed setting dial 36 is exposed from the motor housing 18. The speed setting dial 36 emits a signal according to the rotation position (angle). According to this signal, the maximum rotational speed of the motor 3 is set. The speed setting dial 36 is arranged in a recess 2P provided in the upper part of the main body housing 2 (motor housing 18). The recess 2P is recessed downward with respect to the surrounding part. The speed setting dial 36 is arranged below the virtual plane that contacts the front side and the rear side of the recess 2P, as shown by the dashed-dotted line G in Fig. 2. Therefore, the situation where the user accidentally touches the speed setting dial 36 is suppressed, and the misoperation of the speed setting dial 36 is suppressed. Also, even if an object approaches from above the main body housing 2 and contacts the upper part of the main body housing 2, it is difficult for the object to enter the recess 2P (below the dashed-dotted line G). Therefore, the speed setting dial 36 is protected from the collision of the object.

[0020] The motor housing 18 holds a controller 40 below the motor 3. The controller 40 has a control circuit board 42 and a controller case 44. The control circuit board 42 controls the motor 3. The control circuit board 42 is mounted with at least a microcomputer and a plurality (6 or 12) of switching elements. The controller case 44 is made of metal (aluminum) and is in the shape of a box without a lid that is open upward and rearward. The control circuit board 42 is placed inside the controller case 44. A mold layer 46 that covers the control circuit board 42 is formed by injecting mold into the controller case 44.

[0021] The controller 40 is disposed below the motor 3. The controller 40 is in an inclined posture, more specifically, a forward-upward posture. The front surface of the controller case 44 is along the front wall 18W of the front lower part 18F of the motor housing 18. A plurality of rear lower exhaust holes 48 are opened in the front lower part 18F of the motor housing 18. Each rear lower exhaust hole 48 extends in the left-right direction and is arranged in the front-rear and left-right directions. Each rear lower exhaust hole 48 is disposed in a portion of the motor housing 18 below the portion that holds the controller 40. That is, each rear lower exhaust hole 48 is disposed in a portion of the motor housing 18 on the side opposite to the fan 4 with respect to the controller 40. The space between the front surface of the controller case 44 and the front wall 18W serves as an exhaust passage through which the exhaust air WD for cooling from the fan 4 passes. The exhaust air WD exits to the outside through each rear lower exhaust hole 48.

[0022] The rear lower part 18E of the motor housing 18 is recessed upward with respect to the front lower part 18F of the motor housing 18. A battery mounting part 50 is provided in the rear lower part 18E of the motor housing 18. An opening is formed in the rear lower part 18E of the motor housing 18. The battery mounting portion 50 holds the terminal block 52. The front portion of the terminal block 52 is box-shaped, and the rear portion of the terminal block 52 is plate-shaped. The terminal block 52 closes the opening of the rear lower portion 18E of the motor housing 18 and is exposed from the opening. The terminal block 52 holds a plurality of terminal plates (not shown). In the battery mounting portion 50, a battery 54 is mounted by sliding forward from the rear side. The mounted battery 54 is electrically connected to the terminal block 52 (terminal plate). The battery 54 supplies power to the motor 3.

[0023] The power transmission housing 20 directly or indirectly supports each part of the reciprocating conversion mechanism 5, the slider 6, the counterweight mechanism 9, the orbital mechanism 12, and the orbital switching mechanism 14. The power transmission housing 20 is made of metal and is made of an aluminum alloy. The power transmission housing 20 is connected to the front side of the motor housing 18. The power transmission housing 20 is semi-divided and is cylindrical with openings at the front and rear. Since the reciprocating conversion mechanism 5 is arranged in the power transmission housing 20, it can be regarded as a conversion mechanism housing. The power transmission housing 20 includes an upper power transmission housing 20a, a lower power transmission housing 20b, and a bearing box 114. The upper power transmission housing 20a is fixed to the lower power transmission housing 20b by a plurality of vertical screws 55 (FIG. 4, FIG. 16). The rear end portion of the lower power transmission housing 20b is attached to the front end portion of the motor housing 18 by a plurality of longitudinal screws (not shown) extending forward from the motor case 3a.

[0024] The cover 22 is cylindrical. The cover 22 is externally mounted on the power transmission housing 20. The cover 22 is disposed outside the power transmission housing 20. The cover 22 is made of an elastic body (rubber) and is provided outside the power transmission housing 20 as a thermal or electrical insulating cover. Note that the cover 22 may not be included in the components of the main body housing 2. Also, the cover 22 may be formed of plastic. The rear end portion of the cover 22 covers the front end portion of the motor housing 18. The cover 22 is continuous with the motor housing 18 on the outer surface. On the left and right sides of the central portion of the cover 22, a plurality of main body exhaust holes 56 are provided (FIGS. 1 and 9). Each of the left main body exhaust holes 56 extends in the front-rear direction and is arranged in the up-down direction. Similarly, each of the right main body exhaust holes 56 (FIG. 9) extends in the front-rear direction and is arranged in the up-down direction. Each main body exhaust hole 56 is disposed in front of the fan 4. Furthermore, an orbital switching lever hole 58 is formed in the rear left portion of the cover 22 (FIG. 1). The orbital switching lever hole 58 extends in the up-down, front-rear directions. On the other hand, the lower portion of the cover 22, i.e., the front portion of the main body housing 2, serves as the second grip portion 60. The second grip portion 60 is gripped by the user. In addition, at least any one of the number of sections of the main body housing 2, the size of each section of the main body housing 2, and the shape of each section of the main body housing 2 can be variously changed. For example, the rear portion of the motor housing 18 may be a handle housing separate from the motor housing 18. Also, the battery mounting portion 50 may be separate from the motor housing 18.

[0025] Furthermore, a light 62 is disposed between the front upper portion of the power transmission housing 20 and the front upper portion of the cover 22. The light 62 has an LED substrate. The LED substrate mounts LEDs. The light 62 emits light and projects it forward. The light 62 can irradiate the vicinity of the cutting position in front of the slider 6.

[0026] The motor 3, the trigger switch main body portion 34, the speed setting dial 36, the terminal block 52 (terminal board), and the light 62 are each electrically connected to the control circuit board 42 by a plurality of lead wires (not shown). The portion of the motor housing 18 that holds the motor 3 (the portion outside the motor 3), the power transmission housing 20, various members held thereby, and the cover 22 form the main body portion 69 of the reciprocating saw 1.

[0027] The motor 3 is electric. The motor 3 is a brushless motor. The motor 3 is driven by DC. The motor 3 includes a motor case 3a, a stator 71, and a rotor 72.

[0028] The motor case 3a is held by the motor housing 18. The stator 71 has a plurality (six) of coils 73. The stator 71 is cylindrical. A sensor substrate 75 is fixed to the stator 71. A plurality (three) of magnetic sensors are fixed to the rear surface of the sensor substrate 75. Each magnetic sensor obtains a rotation detection signal indicating the rotational position of the rotor 72 and acquires the rotational state of the rotor 72. Also, the sensor substrate 75 and the control circuit board 42 are electrically connected by a plurality (six) of lead wires (signal wires) not shown. The signal wires pass through the front lower portion 18F of the motor housing 18. Furthermore, the stator 71 is provided with a coil connection portion 77 as a contact for electrically connecting each coil 73 in a predetermined manner. The first ends of a plurality (three) of lead wires (power supply wires) not shown are connected to the coil connection portion 77. The three power supply wires are related to three phases. Each power supply wire passes through the front lower portion 18F of the motor housing 18. The second end of each power supply wire is connected to the control circuit board 42.

[0029] The rotor 72 is disposed inside the stator 71. The motor 3 is of an inner rotor type. The rotor 72 has a motor shaft 80, a rotor core 82, a plurality (four) of permanent magnets 84, and a sleeve 86. The motor shaft 80 is cylindrical and extends longitudinally. The motor shaft 80 is made of metal. The motor shaft 80 rotates about its own axis. The front end portion of the motor shaft 80 reaches inside the rear end portion of the power transmission housing 20. A pinion gear portion 80a is formed at the front end portion of the motor shaft 80. The pinion gear portion 80a has a plurality of teeth. The rotor core 82 is cylindrical. The axial direction of the rotor core 82 is the front-rear direction. The rotor core 82 is formed by a plurality of steel plates laminated in the front-rear direction and extending vertically and horizontally. The rotor core 82 is fixed to the outside of the motor shaft 80. Each permanent magnet 84 is plate-shaped. Four permanent magnets 84 are arranged in the rotor core 82 with their polarities alternating in the circumferential direction. The four permanent magnets 84 are not in contact with each other. The sleeve 86 is made of metal (brass) and is ring-shaped. The sleeve 86 is fixed to the rotor core 82, each permanent magnet 84, and the motor shaft 80 on the front side of the rotor core 82 and each permanent magnet 84. The sleeve 86 fixes the permanent magnet 84 to prevent the permanent magnet 84 from falling off the motor shaft 80.

[0030] Also, a motor front bearing 88 is provided in front of the sleeve 86. The motor front bearing 88 is arranged around the front part of the motor shaft 80. The motor front bearing 88 supports the motor shaft 80 so as to be rotatable about the axis. The motor front bearing 88 is held by the rear part of the lower power transmission housing 20b. A motor rear bearing 92 is provided around the rear end portion of the motor shaft 80. The motor rear bearing 92 supports the motor shaft 80 so as to be rotatable about the axis. The motor rear bearing 92 is held by the motor case 3a.

[0031] Around the central part of the motor shaft 80, behind the motor front bearing 88, and in front of the sleeve 86, a fan 4 is arranged. The fan 4 is a centrifugal fan having a plurality of blades. The fan 4 pushes air radially outward by rotation. The fan 4 is integrally fixed to the motor shaft 80 and is rotatable integrally with the motor shaft 80. The fan 4 is provided on the motor shaft 80. The fan 4 is held by the motor housing 18 via the rotor 72 and the lower power transmission housing 20b. The lower power transmission housing 20b is arranged in front of the fan 4. Below the fan 4, the upper end of the air passage (lower air passage) between the front surface of the controller case 44 and the front wall 18W of the front lower portion 18F of the motor housing 18 is arranged. Incidentally, the fan 4 can also be a component of the motor 3.

[0032] Figs. 5 and 6 are partial exploded perspective views of a part of the reciprocating conversion mechanism 5 and its peripheral members as viewed from above and below. Fig. 7 is a central longitudinal sectional view of a part of the reciprocating conversion mechanism 5 and its peripheral members. Fig. 8 is a central longitudinal sectional view when the knob portion 174 of the orbital switching lever 170 is tilted forward from the state of Fig. 7 (see the two-dot chain line in Fig. 1). The reciprocating conversion mechanism 5 is a power transmission mechanism that transmits the power of the motor 3 to the slider 6. The reciprocating conversion mechanism 5 converts the rotational motion of the motor shaft 80 of the motor 3 into a reciprocating motion of the slider 6 and transmits it. The reciprocating conversion mechanism 5 is held by the power transmission housing 20. The reciprocating conversion mechanism 5 is interposed between the motor 3 and the slider 6. The reciprocating conversion mechanism 5 includes a bevel gear 100, a torque limit mechanism 102, an intermediate shaft 104, a crank base 106, and a crank cam 108.

[0033] The bevel gear 100 is disk-shaped and extends in the front-rear, left-right directions, and has bevel teeth (not shown) on the periphery of the upper surface. The bevel gear 100 meshes with the pinion gear portion 80a. The bevel gear 100 rotates around a virtual rotation axis in the vertical direction passing through the center in the front-rear, left-right directions.

[0034] The torque limit mechanism 102 is interposed between the bevel gear 100 and the intermediate shaft 104. The torque limit mechanism 102 transmits power from the bevel gear 100 to the intermediate shaft 104. The torque limit mechanism 102 protects the bevel gear 100 and the motor 3 from the excessive load by the upper and lower horizontal plates that are in close contact due to the biasing of the elastic body and move away from each other against the biasing force due to the excessive load from the bevel gear 100 side.

[0035] The intermediate shaft 104 is a cylindrical member extending vertically. The intermediate shaft 104 is rotatably supported by an upper intermediate bearing 110 and a lower intermediate bearing 112 around the same virtual rotation axis as the bevel gear 100 (Figs. 2 and 3). The upper intermediate bearing 110 is held by the lower power transmission housing 20b. The lower intermediate bearing 112 is a needle bearing. The lower intermediate bearing 112 is held by a dish-shaped bearing box 114 (Figs. 2 and 3). The bearing box 114 is fixed to the lower power transmission housing 20b by a plurality of screws 116 in the vertical direction (only one is shown in Figs. 2 and 3).

[0036] The crank base 106 is a crank-shaped member. The lower part of the crank base 106 is a cylindrical columnar part 106A, which is fixed to the upper part of the intermediate shaft 104 by screws. The central part of the crank base 106 is a plate-shaped part 106B extending in the front-rear, left-right directions. The upper part of the crank base 106 is formed as an eccentric disk part 106C extending in the front-rear, left-right directions, whose center is offset from the virtual central axis of the lower part of the crank base 106.

[0037] The crank cam 108 has a crank cam body 120, an eccentric pin 122, a barrel-shaped roller 124, and a bearing 126. The crank cam body 120 is disk-shaped and extends in the front-rear, left-right, and up-down directions. The virtual central axis in the up-down direction of the crank cam body 120 coincides with the same virtual rotation axis as the bevel gear 100. At the lower part of the crank cam body 120, a coupling part 127 that protrudes downward in a cylindrical shape with respect to other parts is formed. In the coupling part 127, the eccentric disk part 106C of the crank base 106 is coupled by screws 128 and press-fitting. Also, a cam part 130 is formed at the peripheral edge of the upper surface of the crank cam body 120. The cam part 130 protrudes upward with respect to the adjacent part. The cam part 130 is ring-shaped when viewed from above. The height of the cam part 130 in the up-down direction gradually changes along the circumferential direction (see FIGS. 7, 8, etc.). That is, the upper surface of the cam part 130 is the cam surface 130a. The height of the cam surface 130a gradually changes from the lowest lowest point 130a1 to the highest highest point 130a2. The eccentric pin 122 is columnar and extends in the up-down direction. The lower part of the eccentric pin 122 enters a hole in the up-down direction provided in the crank cam body 120. The hole is displaced in the radial direction from the virtual central axis of the crank cam body 120. The barrel-shaped roller 124 is a cylindrical member. The outer surface of the barrel-shaped roller 124 bulges so that the diameter becomes larger toward the center in the up-down direction. The barrel-shaped roller 124 is provided at the upper part of the eccentric pin 122 via a bearing 126. The barrel-shaped roller 124 is rotatably supported around a virtual rotation axis in the up-down direction. The bearing 126 is a needle bearing.

[0038] The slider 6 has a slider body 136 and a blade holding part 138 as a tip tool holding part. The front end part of the slider 6 protrudes from the front end of the power transmission housing 20. The slider body 136 is cylindrical and extends in the front-rear direction. At the rear part of the slider body 136, a barrel-shaped roller receiving part 140 is provided. The barrel-shaped roller receiving part 140 is a bottomed long cylindrical shape that extends in the left-right direction. The barrel-shaped roller receiving part 140 is open downward. The barrel-shaped roller receiving part 140 receives the barrel-shaped roller 124. When the crank cam 108 rotates, the barrel-shaped roller 124 rotates eccentrically. Due to the front-back component of the movement of the barrel-shaped roller 124, the slider body 136 reciprocates in the front-back direction via the barrel-shaped roller receiving portion 140. The left-right component of the movement of the barrel-shaped roller 124 becomes the relative movement of the barrel-shaped roller 124 within the barrel-shaped roller receiving portion 140 and is not transmitted to the slider body 136. The blade holding portion 138 holds a blade (not shown) as a tip tool. The blade holding portion 138 automatically holds the blade (one-touch mounting) by simply inserting the rear end portion of the blade. The blade holding portion 138 bulges upward, downward, leftward, and rightward with respect to the slider body 136. The slider 6 is an output portion. The blade is a tip tool. The blade is in the shape of a long plate and extends front and back when mounted. The blade has a blade on one long side. The blade is a sawtooth. The blade is mounted with the blade facing downward. Note that the blade may be mounted with the blade facing upward. Also, the blade may have blades on both long sides. The tip tool may be other than the blade. A cam sleeve 141 is provided on the outer peripheral portion of the blade holding portion 138. The cam sleeve 141 is rotatable around the center axis in the front-back direction in the blade holding portion 138 with respect to other portions of the blade holding portion 138. The cam sleeve 141 has a protrusion 142. The protrusion 142 protrudes radially outward with respect to other portions of the blade holding portion 138. When the cam sleeve 141 is rotated clockwise when viewed from the front while the blade holding portion 138 is receiving the blade, the blade is removed.

[0039] The guide shoe mechanism 8 is disposed adjacent to the blade mounted on the blade holding portion 138.

[0040] The counterweight mechanism 9 is combined with the reciprocating motion conversion mechanism 5. The counterweight mechanism 9 has a metal balancer 144 and a ring 145. Balancer 144 is plate-shaped and extends in the front-rear, left-right directions, and has a long hole 146 extending in the left-right direction at its central portion. The portion of the balancer 144 in front of the long hole 146 is heavier than the portion behind the long hole 146. In the long hole 146 of the balancer 144, the connecting portion 127 of the crank cam 108 is inserted via a ring 145. A slit 147 extending in the front-rear direction is provided in the portion of the balancer 144 in front of the long hole 146. A rod 148 passes through the slit 147. The rod 148 extends vertically. The lower portion of the rod 148 is held by the lower power transmission housing 20b. A recessed portion 149 that is recessed upward with respect to the surrounding portion is provided in the lower portion of the portion of the balancer 144 behind the long hole 146. The recessed portion 149 avoids the rear upper portion X of the lower power transmission housing 20b (see FIG. 3). The balancer 144 reciprocates in the front-rear direction due to the rotation of the crank cam 108. The connecting portion 127 is arranged on the opposite side with the barrel-shaped roller 124 and the center of the crank cam body 120 interposed therebetween. More specifically, the connecting portion 127 and the barrel-shaped roller 124 have an angle of about 175° with respect to the front-rear, left-right center of the crank cam body 120. Therefore, the portion of the balancer 144 in front of the long hole 146 basically moves in the opposite direction to the slider 6 in the front-rear direction. Accordingly, the vibration generated by the reciprocating motion of the slider 6 is suppressed by the balancer 144. That is, the balancer 144 serves as a counterweight by operating in the opposite direction to the forward and backward movement of the slider 6. Note that the component in the left-right direction of the movement of the connecting portion 127 becomes a relative movement of the connecting portion 127 in the long hole 146 and is not transmitted to the balancer 144. Also, the angle between the connecting portion 127 and the barrel-shaped roller 124 may be 180° or other angles.

[0041] The orbital mechanism 12 includes a slider support body 150, a plurality (two) of oil-less bearings 151 as slider supports, a plurality (two) of plates 152, a slider support shaft 153, a plurality of springs 154 as elastic bodies, a bearing 156, and a plurality of screws 160. The slider support body 150, each oil-free bearing 151, each plate 152, the bearing 156, and each screw 160 constitute a cylindrical slider support 161. Note that the bearing 156 or the like may be removed from the components of the slider support 161. Also, at least one of the slider support shaft 153 and each spring 154 may be included in the components of the slider support 161.

[0042] The slider support body 150 is made of metal and is box-shaped extending in the front-rear direction. Oil-free bearings 151 are held at the front and rear inside the slider support body 150. The outer shape of the cross-section of the oil-free bearing 151 is square. The slider 6 is reciprocally penetrated through each oil-free bearing 151. An opening is provided in a part of the central portion at the lower part of the slider support body 150, including the part where the barrel-shaped roller 124 and the barrel-shaped roller receiving portion 140 can be located. Each oil-free bearing 151 is arranged before and after the opening. Behind the lower part of the slider support body 150, and below the rear oil-free bearing 151, the rear plate 152 is fixed by a plurality (two on the left and right) of screws 160 in the vertical direction. The rear plate 152 is made of metal and extends in the front-rear and left-right directions. The slider support body 150 holds the rear oil-free bearing 151 from above. The rear plate 152 holds the rear oil-free bearing 151 from below. In front of the lower part of the slider support body 150, and below the front oil-free bearing 151, the front plate 152 is fixed by a plurality (two on the left and right) of screws 160 in the vertical direction. The front plate 152 is made of metal and extends in the front-rear and left-right directions. The slider support body 150 holds the front oil-free bearing 151 from above. The front plate 152 holds the front oil-free bearing 151 from below. Note that the plate 152 and the screw 160 may be omitted.

[0043] On the left and right of the front lower part of the slider support body 150, there are provided shaft holes 162 extending in the left-right direction. The peripheral part of the shaft hole 162 is fixed to the upper power transmission housing 20a. The slider support shaft 153 passes through the left and right shaft holes 162. The slider support 161 is swingable around the slider support shaft 153. Each spring 154 is provided on the left and right of the rear upper part of the slider 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.

[0044] The bearing 156 is provided behind the lower opening of the slider support body 150 and in front of the plate 152. The bearing 156 is a ball bearing. The inner ring of the bearing 156 is held on the outer surface of the oil-less bearing 151. The outer ring of the bearing 156 can contact the cam surface 130a of the crank cam 108.

[0045] The orbital switching mechanism 14 has an orbital switching lever 170 as an orbital switching member. The orbital switching lever 170 has a lever body 172 as a shaft portion and a knob portion 174.

[0046] The lever body 172 is rod-shaped and shaft-shaped, extending left and right. The orbital switching lever 170 is held by the upper power transmission housing 20a in a rotatable state around the virtual central axis C (see FIGS. 7 and 8) of the lever body 172. The virtual central axis C of the lever body 172 is parallel to the contacting plate 152. The lever body 172 has a first plane 176 as a support surface extending left and right and a second plane 178 as a second orbital state surface extending left and right. The first plane 176 and the second plane 178 form a predetermined angle (here, about 100°). The distance from the central axis C to the first plane 176 is larger than the distance from the central axis C to the second plane 178. In the case of FIG. 7 where the orbit is in the first state (first orbital state), the orbital switching lever 170 is in a state where the first plane 176 can contact the lower rear portion (rear plate 152) of the slider support 161. When the orbital switching lever 170 contacts the plate 152, the first plane 176 extends on both sides in the front-rear direction with respect to a virtual vertical plane V (vertical plane, see FIG. 7) that includes the central axis C and is perpendicular to the first plane 176. That is, the first plane 176 straddles the vertical plane V. In other words, the first plane 176 has a first portion 176a on the front side of the central axis C (vertical plane V) and a second portion 176b on the rear side of the central axis C (vertical plane V). Note that FIG. 4 is a view with the vertical plane V as a cross section. On the other hand, in the case of FIG. 8 where the orbit is in the second state (second orbital state), the orbital switching lever 170 is in a state where the second plane 178 faces the lower rear portion of the slider support 161 with a gap therebetween. In this case, the bearing 156 of the orbital mechanism 12 contacts the entire circumference of the cam surface 130a of the cam portion 130.

[0047] When in the second orbital state, due to the downward biasing force of each spring 154, the bearing 156 also contacts the lowest point 130a1 of the cam surface 130a on the cam portion 130 (see FIG. 8). The second plane 178 of the lever body 172 is separated from the rear lower portion of the slider support 161 even at this time. Then, the slider support 161, the slider 6, and the blade face upward (front upward). Also, the bearing 156 contacts the highest point 130a2 on the cam surface 130a. Then, the bearing 156 is pushed upward by the cam surface 130a against the biasing force of each spring 154, and the slider support 161, the slider 6, and the blade face downward (front downward). The height of the portion between the lowest point 130a1 and the highest point 130a2 on the cam surface 130a in the circumferential direction gradually changes. Therefore, the bearing 156 that relatively follows the cam surface 130a by the rotation of the crank cam 108 moves up and down. Accordingly, the slider support 161, the slider 6, and the blade repeatedly assume a front upward state, a state along the front-rear direction, a front downward state, and a state along the front-rear direction, and the blade holding portion 138 performs an orbital motion in an elliptical shape. The orbital motion is associated with the reciprocating motion of the slider 6 according to the circumferential distribution of the height of the cam surface 130a on the crank cam 108. Here, when the slider 6 moves forward, the slider 6 assumes a front upward state, and when the direction of movement of the slider 6 changes from forward to backward (or when passing near the switching point), the slider 6 assumes a state along the front-rear direction. When the slider 6 moves backward, the slider 6 assumes a front downward state, and when the direction of movement of the slider 6 changes from backward to forward (or when passing near the switching point), the distribution of the height of the cam surface 130a is adjusted so that the slider 6 assumes a state along the front-rear direction. Even when the slider support 161 and the slider 6 change their postures upward or downward, the slider 6 is sufficiently reciprocated by the barrel roller 124.

[0048] On the other hand, when in the first orbital state, since the rear part of the slider support 161 is lifted by the first plane 176 of the lever body 172, the bearing 156 does not contact the lowest point 130a1 on the cam surface 130a and its adjacent part. Therefore, the front upward movement of the slider 6 is suppressed compared to the case of the second orbital state. In contrast, the bearing 156 contacts the highest point 130a2 on the cam surface 130a and its adjacent part. And the bearing 156 contacts at about half of the cam part 130 and does not contact with the first plane 176 of the lever body 172 at the remaining part. Therefore, the transition from the state along the front-rear direction through the front downward state to the state along the front-rear direction when the slider 6 moves rearward (the semi-elliptical arc-shaped orbital movement of the blade holding part 138 when the slider 6 moves rearward) is performed in the same manner as in the second orbital state, but when the slider 6 moves forward, a state where the slider 6 generally moves along the front-rear direction is maintained. Therefore, in the case of the first orbital state, the blade holding part 138 performs an orbital movement in a semi-elliptical shape.

[0049] In the first orbital state, the blade holding part 138 performs an orbital movement in a range of about half a circle (the first range). In contrast, in the second orbital state, the blade holding part 138 performs an orbital movement in a full circle range (the second range) wider than the range of about half a circle (the first range). In addition, in the first orbital state, it is not necessary to perform an orbital movement in the entire range. For example, an orbital movement may be performed only in an arc shape of one-fourth, and no orbital movement may be performed in the remaining three-fourths. That is, the range of the orbital movement (the ratio of presence or absence) may be changed. Similarly, in the case of the second orbital state, no orbital movement may be performed in a part of the range. That is, if the range of the orbital movement (the first range) in the first orbital state is smaller than the range of the orbital movement (the second range) in the second orbital state, the range in which the orbital movement is performed can be changed in various ways.

[0050] The knob part 174 intersects with the lever body 172 and is perpendicular here. The knob portion 174 is disposed on the left side of the power transmission housing 20 and the cover 22 and is exposed to the outside. The knob portion 174 is disposed within the orital switching lever hole 58 of the cover 22. The user can operate the knob portion 174 to rotate the orital switching lever 170 around the central axis C and switch the orital state.

[0051] FIG. 9 is a perspective view of the front portion of the reciprocating saw 1 as seen from the upper right front. In FIG. 9, the shoe 229 (described later) of the guide shoe mechanism 8 is omitted. A gap is provided between the left portion of the power transmission housing 20 and the left portion of the cover 22, and the cooling exhaust air WL from the fan 4 passes through the gap. The exhaust air WL exits to the outside through each of the left main body exhaust holes 56 (FIG. 1). Similarly, a gap is provided between the right portion of the power transmission housing 20 and the right portion of the cover 22, and the cooling exhaust air WR from the fan 4 passes through the gap. The exhaust air WR exits to the outside through each of the right main body exhaust holes 56 (FIG. 9).

[0052] Further, on the upper portion of the upper power transmission housing 20a, a rib portion 180 including a pair of ribs extending in the front-rear direction is formed. The rib portion 180 includes a pair of walls protruding upward with respect to adjacent portions. At the front end portion of the rib portion 180, a housing portion 180a for the light 62 is formed. The lead wire connecting the light 62 and the control circuit board 42 passes through the rib portion 180. The rib portion 180 houses the lead wire of the light 62. The upper end portion of the rib portion 180 is in contact with the upper inner surface of the cover 22. Gaps 181L and 181R as the first passages are provided on each side of the rib portion 180 between the upper portion of the upper power transmission housing 20a and the upper portion of the cover 22. In the gaps 181L and 181R, the exhaust air W1 from the fan 4 passes through. In FIGS. 2 and 3, for the sake of convenience, the exhaust air W1 is depicted as overlapping within the rib portion 180, but in actuality, most of the exhaust air W1 passes through the gaps 181L and 181R. The first passage for exhaust may not be divided left and right, or may be divided into three or more parts.

[0053] At the front of the upper power transmission housing 20a, a front wall 184 extending vertically and horizontally is provided. The front wall 184 is disposed on the front side of the slider support 161. The front wall 184 has a hole for passing the slider body 136. 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 with respect to an adjacent portion. The wall portion 186 is in a semi-circular arc shape when viewed from the rear and surrounds the slider 6. 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 disposed on the left side of the ridge portion 180. The right hole 188R is disposed on the right side of the ridge portion 180. When the exhaust air W1 passing through the gap 181L enters the left hole 188L from above and flows forward up to the front of the left hole 188L, if there is no wall portion 186, after entering the left hole 188L, it will be directed toward the blade holding portion 138 (see the exhaust air W2). Similarly, when the exhaust air W1 passing through the gap 181R enters the right hole 188R from above and flows forward up to the front of the right hole 188R, if there is no wall portion 186, after entering the right hole 188R, it will be directed toward the blade holding portion 138. In the reciprocating saw 1, due to the wall portion 186, the exhaust air W1 branches into an exhaust air W2 directed toward the blade holding portion 138 and an exhaust air W3 not directed toward the blade holding portion 138. That is, between the front wall 184 and the wall portion 186, the gaps 181L and 181R as the first passage branch into a second passage 192 before the portion between the wall portion 186 directed toward the blade holding portion 138 and the slider 6 and a third passage 193 below the front wall 184 and the wall portion 186. Moreover, the left hole 188L and the right hole 188R may not be divided left and right, or may be divided into three or more parts.

[0054] The lower power transmission housing 20b has a lower wall portion 196 that is vertically symmetric with respect to the wall portion 186. The lower wall portion 196 protrudes upward in an arcuate band shape from the inner surface of the lower part of the lower power transmission housing 20b. The upper end portion of the lower wall portion 196 is in continuous contact with the lower end portion of the wall portion 186. At the lower part of the lower power transmission housing 20b and behind the lower wall portion 196, a front lower exhaust hole 198 (FIG. 10) serving as a lower exhaust hole is opened. Behind the front lower exhaust hole 198, the lower part of the front wall 184 of the upper power transmission housing 20a is disposed. Between the lower wall portion 196 and the slider 6, together with the space between the wall portion 186 and the slider 6, a second passage 192 (FIG. 10) is formed. The rear side of the lower wall portion 196, together with the space between the front wall 184 and the wall portion 186, forms a third passage 193 (FIG. 10). The third passage 193 extends to the front lower exhaust hole 198. The exhaust air W3 hits the inner surface of the lower part of the cover 22 after passing through the gap of the guide shoe mechanism 8 from the front lower exhaust hole 198, faces forward, and exits to the outside from below the blade holding portion 138 (around the base of the guide shoe mechanism 8).

[0055] Inside the power transmission housing 20, a release mechanism 201 is disposed on the front side of the wall portion 186 and the lower wall portion 196. The release mechanism 201 acts on the blade holding portion 138 and is a mechanism for removing the blade. The release mechanism 201 has a release drum 202 and a tension spring 203.

[0056] The release drum 202 is cylindrical and is housed in the power transmission housing 20. The wall portion 186 restricts the rearward movement of the release drum 202. The release drum 202 is adjacent to the blade holding portion 138. The release drum 202 is disposed around the cam sleeve 141. The release drum 202 is operated by the user and is an operating drum for operating the removal (release) of the blade from the blade holding portion 138. The release drum 202 has an inner raised portion 204 and an operating piece 206. The inner raised portion 204 is disposed on the inner surface of the release drum 202 and protrudes radially inward from other portions on the inner surface of the release drum 202. The inner raised portion 204 is disposed on the right portion of the release drum 202. The operating piece 206 is disposed on the right portion of the release drum 202. The operating piece 206 protrudes radially outward with respect to other outer surfaces. In the state illustrated by the solid line, the operating piece 206 extends from the upper left to the lower right and spreads in the front-rear direction. The operating piece 206 is integrally formed with other portions (the cylindrical release drum main body portion) of the release drum 202. The operating piece 206 extends rightward from the first operating piece hole 212 provided in the power transmission housing 20 and the second operating piece hole 214 of the cover 22.

[0057] The tension spring 203 is a coil spring. The tension spring 203 is disposed on the outer side in the circumferential direction of the release drum 202 and extends in the circumferential direction of the release drum 202. The tension spring 203 is disposed within the power transmission housing 20. The first end of the tension spring 203 has a hook shape and is locked to the release drum 202. The second end of the tension spring 203 has a hook shape and is fixed to the lower power transmission housing 20b.

[0058] When the tension spring 203 is in a state slightly extended from its natural length, the inner raised portion 204 of the release drum 202 is not in contact with the protrusion 142 of the cam sleeve 141 in the blade holding state. At this time, the operating piece 206 of the release drum 202 is in contact with the lower ends of the first operating piece hole 212 and the second operating piece hole 214. Incidentally, the tension spring 203 at this time may be in other states such as the natural length state. The user can operate the operation piece 206 located below upward to rotate the release drum 202 around the axis in the front-rear direction against the biasing force of the tension spring 203. In this case, due to the rotation of the release drum 202, the inner raised portion 204 contacts the protrusion 142 of the cam sleeve 141, and rotates the cam sleeve 141 clockwise when viewed from the front. Due to the rotation of this cam sleeve 141, the holding of the blade in the blade holding portion 138 is released. The blade whose holding has been released is pushed forward by the blade holding portion 138. Therefore, the release drum 202 of the release mechanism 201 is interlocked with the inner blade holding portion 138, and when the operation piece 206 is operated upward, the blade is released from the blade holding portion 138. Note that the operation drum may be configured to perform the blade mounting operation instead of or together with the blade release operation.

[0059] The exhaust air W2 directed toward the blade holding portion 138 passes between the release drum 202 and the slider 6 and exits to the external front.

[0060] Figure 10 is a partially enlarged view of the front part of Figure 2. Figure 11 is a partially exploded perspective view of the guide shoe mechanism 8 and its surrounding members in Figure 2 as viewed from above. Figure 12 is a partially exploded perspective view of the guide shoe mechanism 8 and its surrounding members in Figure 2 as viewed from below. Figure 13 is a cross-sectional view taken along line B-B of Figure 10. Figure 14 is a cross-sectional view taken along line C-C of Figure 10. Figure 15 is a cross-sectional view taken along line D-D of Figure 10. Figure 16 is a cross-sectional view taken along line E-E of Figure 10. The guide shoe mechanism 8 is disposed on the front side and the lower side of the slider 6. The guide shoe mechanism 8 includes a shoe plate 220, a shoe guide plate 222, a shoe supporter 226, a plurality (two) of shafts 227, a pin mechanism 228, a lock lever 249, and a shoe supporter locking shaft 250. The shoe plate 220, the shoe supporter 226, and each shaft 227 constitute a shoe 229. The shoe plate 220 is made of metal and is made of iron. The front surface of the shoe plate 220 can contact the workpiece. Axial holes 220F in the left and lower part and the right and lower part of the shoe plate 220 are respectively provided.

[0061] The shoe guide plate 222 is made of metal and is made of iron. The shoe guide plate 222 is fixed to the lower part of the lower power transmission housing 20b by a vertical screw 230 and a horizontal screw 232. The screw 230 enters a screw boss portion 234 formed in the lower power transmission housing 20b. The screw 232 enters a horizontal screw hole portion 236 formed in the lower power transmission housing 20b. The screw 232 is combined with a nut 237 on the left side. The shoe guide plate 222 is arranged between the outer surface of the front and lower part of the lower power transmission housing 20b and the inner surface of the front and lower part of the cover 22. The cross section of the shoe guide plate 222 is in a "U" shape. The shoe guide plate 222 has a bottom plate portion 222B, a left wall portion 222L and a right wall portion 222R that stand up from each of its left and right side portions. The shoe guide plate 222 has a screw hole 222F, a plurality (two) of screw holes 222G, a plurality (four) of holes 222H, and a plurality (two) of holes 222I. The screw hole 222F is arranged at the rear end portion of the bottom plate portion 222B. The screw 230 passes through the screw hole 222F. Each screw hole 222G is arranged at the front end portion of the left wall portion 222L and the front end portion of the right wall portion 222R. The screw 232 passes through each screw hole 222G. The screw 232 is arranged above the shoe supporter 226. Each hole 222H is arranged in the bottom plate portion 222B. Each hole 222H is arranged in the front-rear direction. Each hole 222H is arranged at equal intervals from each other. Each hole 222I is arranged behind the screw hole 222G in the left wall portion 222L and behind the screw hole 222G in the right wall portion 222R. In addition, the main body housing 2 may be treated as including the shoe guide plate 222 where it is not included.

[0062] The shoe supporter 226 is made of metal and is made of iron. The shoe supporter 226 is disposed inside the shoe guide plate 222. The shoe supporter 226 is slidably disposed back and forth inside the shoe guide plate 222. The shoe supporter 226 is disposed between the front lower outer surface of the lower power transmission housing 20b and the front lower inner surface of the shoe guide plate 222. The shoe guide plate 222 guides the (sliding of) the shoe supporter 226. The cross section of the shoe supporter 226 is in a "U" shape. The shoe supporter 226 has a bottom plate portion 226B, and a left wall portion 226L and a right wall portion 226R that stand up from each of its left and right side portions. The shoe supporter 226 has a plurality (two) of shaft holes 226F, a plurality (six) of left engaged portions 226K, a plurality (six) of right engaged portions 226Q, a plurality (two) of holes 226H1 and one hole 226H2, and a front-rear direction slit 226S. Each shaft hole 226F is disposed at the front end of the left wall portion 226L and the front end of the right wall portion 226R. Each left engaged portion 226K is an arc-shaped downward recess provided at the center of the upper side in the left wall portion 226L and is arranged in the front-rear direction. Each right engaged portion 226Q is an arc-shaped downward recess provided at the center of the upper side in the right wall portion 226R and is arranged in the front-rear direction. Each hole 226H1 and hole 226H2 are disposed on the bottom plate portion 226B and are arranged in the front-rear direction. The shoe supporter 226 is lightened by each hole 226H1 and hole 226H2. The slit 226S extends forward from the rear end of the bottom plate portion 226B. A left convex portion 226J is provided to the left of the rear edge of the slit 226S. The left convex portion 226J protrudes from the left side of the slit 226S toward the right, which is the inner side in the left - right direction. A right convex portion 226P is provided to the right of the rear edge of the slit 226S. The right convex portion 226P protrudes from the right side of the slit 226S toward the left, which is the inner side in the left - right direction. The left convex portion 226J and the right convex portion 226P face each other with a gap smaller than the slit width, which is the width (size in the left - right direction) of other portions of the slit 226S. Between the left convex portion 226J and the right convex portion 226P is a slit narrowing portion where the width of the slit 226S narrows. Note that either the left convex portion 226J or the right convex portion 226P may be omitted.

[0063] The shoe guide plate 222 does not reach the front end of the cover 22. Therefore, the shoe supporter 226 is in contact with the contact portion 22T, which is the inner surface at the lower part of the front end of the cover 22. The contact portion 22T bulges upward (radially inward) with respect to other portions on the inner surface of the front part of the cover 22. Below the cover 22 and below the central portion of the shoe guide plate 222, a bulging portion 22P that bulges downward with respect to its rear side is formed. The bulging portion 22P is separated from the shoe guide plate 222, and there is a space inside the bulging portion 22P. Also, the front lower part of the lower power transmission housing 20b has the same width as between the left wall portion 226L and the right wall portion 226R of the shoe supporter 226. The bottom of the front lower part of the lower power transmission housing 20b has a plurality of ribs that protrude downward with respect to other portions. Between these ribs at the bottom of the front lower part of the lower power transmission housing 20b, there are a plurality of recesses that are concave upward. When the shoe supporter 226 is at the rearmost position (the rearmost slide position shown in the figure), inside the slit 226S and behind the left convex portion 226J and the right convex portion 226P, there are screws 230 and screw boss portions 234 for fixing the shoe guide plate 222.

[0064] Each shaft 227 is arranged on the left and right sides of the front end of the shoe supporter 226. Each shaft 227 supports the shoe plate 220 so as to be swingable around the axis in the left - right direction. Each shaft 227 passes through the shaft hole 220F of the shoe plate 220 and the shaft hole 226F of the shoe supporter 226 arranged inside it in the left - right direction.

[0065] The pin mechanism 228 has a pin 240, a compression spring 242 which is an elastic body, and a ring spring 244 which is an elastic body. The pin mechanism 228 is placed in a cylindrical recess 238 with an upper bottom on the lower front bottom surface of the lower power transmission housing 20b.

[0066] The pin 240 extends in the vertical direction. The pin 240 has a small - diameter part 240A, a large - diameter part 240B, and a cylindrical part 240C. The small - diameter part 240A is cylindrical and is arranged at the lower end. The diameter of the small - diameter part 240A is smaller than the interval between the left convex part 226J and the right convex part 226P. The large - diameter part 240B is cylindrical. The large - diameter part 240B has a larger diameter than the small - diameter part 240A. The diameter of the large - diameter part 240B is larger than the interval between the left convex part 226J and the right convex part 226P. The large - diameter part 240B is arranged above the small - diameter part 240A. The large - diameter part 240B is concentric with the small - diameter part 240A. The cylindrical part 240C is arranged above the large - diameter part 240B. The outer diameter of the cylindrical part 240C is larger than the outer diameter of the large - diameter part 240B. The cylindrical part 240C is concentric with the small - diameter part 240A and the large - diameter part 240B.

[0067] The compression spring 242 is a cylindrical helical spring. The compression spring 242 is inserted into the cylindrical part 240C. The compression spring 242 is concentric with the small - diameter part 240A, the large - diameter part 240B, and the cylindrical part 240C. The lower end of the compression spring 242 abuts against the lower bottom of the cylindrical part 240C. The upper end of the compression spring 242 abuts against the upper bottom of the recess 238. The compression spring 242 biases the pin 240 downward. When the compression spring 242 is in its natural length or a normal state closer to the natural length, the lower end of the pin 240 is adjacent to the upper surface of the bulging portion 22P. Also, the small-diameter portion 240A passes through the hole 222H of the shoe guide plate 222. Further, the large-diameter portion 240B is within the slit 226S of the shoe supporter 226. When the shoe 229 is in the rearmost slide position, the pin 240 is within the front end portion of the slit 226S. When the shoe 229 is in the rearmost slide position, the shoe supporter 226 is within the main body portion 69 of the reciprocating saw 1 at the most within the slidable range. The slidable range of the shoe 229 is the lockable forward and backward movement range of the shoe 229.

[0068] The ring spring 244 fixes the pin 240 to the lower power transmission housing 20b. The ring spring 244 is disposed radially outside the pin 240. The ring spring 244 is disposed at the upper end of the large-diameter portion 240B of the pin 240. The ring spring 244 bears against the inner surface of the recess 238 of the lower power transmission housing 20b. Thus, the detachment of the pin mechanism 228 from the recess 238 is suppressed.

[0069] Outside the shoe guide plate 222, a lock lever 249 for locking or unlocking the shoe 229 is disposed. The lock lever 249 is in a "U" shape that opens forward when viewed from above when closed. A left-right shoe supporter locking shaft 250 passing through the upper side of the shoe supporter 226 is connected to the lock lever 249. The lock lever 249, together with the shoe supporter locking shaft 250, is rotatable around the shoe supporter locking shaft 250 and is openable and closable with respect to the cover 22. The shoe supporter locking shaft 250 passes through a left-right hole 251 formed in the lower power transmission housing 20b. The pin mechanism 228 and the recess 238 are disposed on the rear side of the hole 251. The shoe supporter locking shaft 250 passes through each hole 222I of the shoe guide plate 222. The cross-sections of the left and right ends of the shoe supporter locking shaft 250 are "D"-shaped. That is, the shoe supporter locking shaft 250 is columnar and has a left flat surface portion 250F, a right flat surface portion 250G, a left cylindrical surface portion 250C connected to the left flat surface portion 250F, and a right cylindrical surface portion 250D connected to the right flat surface portion 250G.

[0070] When the lock lever 249 is closed (in a state of touching the cover 22 as shown in the drawing), the shoe supporter locking shaft 250 fixes the shoe 229. That is, the left cylindrical surface portion 250C of the shoe supporter locking shaft 250 enters any of the left locked portions 226K of the shoe supporter 226, and the right cylindrical surface portion 250D enters the right locked portion 226Q corresponding to the left locked portion 226K in the front-rear direction position, so that the shoe supporter locking shaft 250 locks to the shoe supporter 226 and suppresses the slide of the shoe 229. On the other hand, when the lock lever 249 is open, the fixing of the shoe 229 by the shoe supporter locking shaft 250 is released. That is, the left cylindrical surface portion 250C of the shoe supporter locking shaft 250 that has rotated together with the lock lever 249 disengages from the left locked portion 226K, and the right cylindrical surface portion 250D disengages from the right locked portion 226Q, so that the shoe supporter locking shaft 250 separates from the shoe supporter 226, the locking of the shoe supporter 226 is released, and the slide of the shoe 229 is allowed. Therefore, the shoe 229 can slide in the front-rear direction, and the position adjustment of the shoe 229 becomes possible. At this time, the left locked portion 226K faces the left flat surface portion 250F. Also, the right locked portion 226Q faces the right flat surface portion 250G. After the position of the shoe 229 is adjusted and the lock lever 249 is closed, the left cylindrical surface portion 250C of the shoe supporter locking shaft 250 enters any of the left locked portions 226K of the shoe supporter 226, and the right cylindrical surface portion 250D enters the right locked portion 226Q corresponding to the left locked portion 226K, and the shoe 229 is locked at the adjusted position. The lock lever 249 and the shoe supporter locking shaft 250 constitute the shoe lock mechanism 254.

[0071] When the shoe 229 moves forward with the lock lever 249 open, the pin 240 of the pin mechanism 228 moves relatively rearward within the slit 226S of the shoe supporter 226. Then, when the shoe 229 moves forward to a certain extent, normally, the large-diameter portion 240B of the pin 240 hits the left convex portion 226J and the right convex portion 226P, and the pin 240 interferes with the shoe 229. Therefore, the forward movement of the shoe 229 beyond a certain extent (the most forward slide position) is suppressed, and the shoe 229 is prevented from coming off. The shoe supporter 226 has a plurality (two) of marks 226M. Each mark 226M indicates the above-mentioned most forward slide position. Note that some or all of the marks 226M may be omitted. When the shoe 229 is in the most forward slide position, the shoe supporter 226 is most exposed from the main body portion 69 of the reciprocator 1 within the slidable range.

[0072] On the other hand, when the pin 240 is pushed upward against the biasing force of the compression spring 242 through the bulging portion 22P of the cover 22, the large-diameter portion 240B is positioned above the slit 226S and disengages from the slit 226S, and the small-diameter portion 240A is positioned within the slit 226S. Therefore, in this case, when the shoe 229 moves forward further, the shoe 229 passes between the left convex portion 226J and the right convex portion 226P of the small-diameter portion 240A and comes off without being caught by the pin 240, and separates from other parts of the reciprocator 1. The removed shoe 229 is attached in the reverse procedure of the removal. Note that the pin operation portion for moving the pin 240 is not limited to the bulging portion 22P. For example, the pin operation portion may be a recessed portion that is recessed with respect to the surroundings.

[0073] Further, as shown in FIG. 16 and the like, a plate 260 is disposed behind the shoe supporter 226. The plate 260 is made of a metal harder than the lower power transmission housing 20b made of an aluminum alloy, and more specifically, is made of iron. The plate 260 extends vertically and horizontally. The plate 260 has a thick "U" shape that opens upward when viewed from the front. The plate 260 is disposed on the front side of the surface 20b1 (FIG. 11) that extends in the front, rear, left, and right directions below the rod 148 in the lower power transmission housing 20b. The plate 260 is located on the left and right sides of the installation portion of the rod 148 in the lower power transmission housing 20b, avoiding the rod 148 and its installation portion. The plate 260 is disposed behind the screw 230 and the screw boss portion 234. The plate 260 is accommodated between the lower power transmission housing 20b and the rear end portion of the shoe guide plate 222. Even when the shoe 229 is in the rearmost slide position, the rear end of the shoe supporter 226 does not contact the plate 260. The plate 260 contacts the shoe supporter 226 that has moved rearward from the rearmost slide position due to an external force or the like.

[0074] Unlike the reciprocator 1, if the plate 260 is not installed, the iron shoe supporter 226 may directly hit the softer lower power transmission housing 20b, deforming the lower power transmission housing 20b. On the other hand, if the plate 260 is installed like the reciprocator 1, the impact force of the shoe supporter 226 is mitigated, and deformation of the lower power transmission housing 20b is suppressed. Also, unlike the reciprocator 1, if a standing portion is bent and formed at the rear end portion of the shoe supporter 226, although the impact force is mitigated by the standing portion, the bent portion may break due to a collision of a certain degree or more. On the other hand, if the plate 260 is installed separately from the shoe supporter 226 like the reciprocator 1, the impact force of the shoe supporter 226 is suppressed for a longer period.

[0075] Such an operation example of the reciprocator 1 will be described. The user sets the blade against the blade holding part 138 of the slider 6 in a stopped state. Typically, since the blade acts on the workpiece from above, the blade is set so that the cutting edge (working part) faces downward. Also, for example, when the blade acts on the workpiece from below, the blade may be set so that it faces upward. The user appropriately adjusts the length of the shoe 229 and applies the front surface of the shoe plate 220 against the workpiece. Further, the user mounts the charged battery 54 on the battery mounting part 50. In addition, the user operates the speed setting dial 36 to select a speed. Then, when the user grips the first grip part 30 (and the second grip part 60) and pulls the trigger 33 by a predetermined amount, the trigger switch main body part 34 is turned on, power is supplied to the motor 3, and the motor shaft 80 rotates. The power supply to the motor 3 is by a DC power supply rectified by the controller 40. Incidentally, when the trigger 33 is pulled in by more than a specific amount, the light 62 lights up. This specific amount is smaller than the predetermined amount at which power is supplied to the motor 3. The microcomputer of the controller 40 acquires the rotation state of the rotor 72 from the sensor board 75. Also, the microcomputer of the controller 40 controls the on / off of each switching element according to the acquired rotation state, and rotates the rotor 72 by sequentially passing current through each coil 73 of the stator 71. Generally, the controller 40 of the motor 3, which is a brushless motor, may generate heat due to the driving of the microcomputer or the like. Also, when heat accumulates in the controller 40, the heat may affect the operation of the controller 40. The motor shaft 80 rotates at a rotational speed corresponding to the signal (the amount of pulling of the trigger 33) of the turned-on trigger switch main body part 34. The rotational speed of the motor shaft 80 becomes higher as the amount of pulling of the trigger 33 increases. Also, the maximum rotational speed of the motor shaft 80 is controlled by the controller 40 according to the rotation state of the speed setting dial 36. When the motor shaft 80 rotates, the crank cam 108 rotates via the bevel gear 100, torque limit mechanism 102, intermediate shaft 104, and crank base 106, and the slider 6 moves back and forth. Also, the balancer 144 moves in the front-rear direction opposite to the slider 6, and the slider 6 moves back and forth in a state where vibrations are suppressed.

[0076] The slider 6 is guided by the front and rear oil-less bearings 151 in a state where it is suppressed from facing directions other than the direction of the slider support body 150. When the user moves the knob portion 174 of the orbital switching lever 170 forward (see the two-dot chain line in FIG. 1), the second plane 178 of the lever body 172 extends in the front-rear, left-right directions (see FIG. 8), and it moves away from the rear plate 152. The bearing 156 of the orbital mechanism 12 relatively traces the entire circumference of the cam surface 130a of the crank cam 108, and swings the slider support body 150 in accordance with the reciprocating motion of the slider 6. Therefore, the orbital motion is performed throughout the entire reciprocating motion of the slider 6 (second orbital state). Also, when the user tilts the knob portion 174 of the orbital switching lever 170 backward (see the solid line in FIG. 1), the first plane 176 of the lever body 172 extends in the front-rear, left-right directions (see FIG. 7), and it is in a state where it can lift the rear plate 152. The bearing 156 of the orbital mechanism 12 relatively traces only about half of the circumference of the cam surface 130a of the crank cam 108, swings the slider support body 150 in accordance with the reciprocating motion of the slider 6 only for about half of the circumference, does not contact the cam portion 130 in the remaining about half of the circumference, and maintains the posture of the slider support body 150. Therefore, the orbital motion is performed in about half of the reciprocating motion of the slider 6 (first orbital state).

[0077] In the operating state of the slider 6 to the blade, when the user lowers the blade toward the workpiece, the blade of the reciprocating blade hits the workpiece, and the workpiece is cut. The second orbital state is suitable, for example, when the workpiece is wood. Also, the first orbital state is suitable, for example, when the workpiece is metal.

[0078] Further, due to the rotation of the fan 4 accompanying the rotation of the motor shaft 80, the air around the fan 4 is pushed radially outward of the fan 4. Thus, an air flow (wind) is generated so as to reach the fan 4 from each intake hole 31, pass through the inside of the motor housing 18, and further reach the main body exhaust holes 56 and each lower exhaust hole 48 respectively. That is, exhaust winds WD, WL, WR, W1 to W3, etc. are generated. By such wind, various members inside the main body housing 2 are cooled. In particular, the motor 3 is cooled by the intake wind from each intake hole 31 to the fan 4. The intake wind passes between the stator 71 and the rotor 72 and cools the stator 71 and the rotor 72. Also, the intake wind passes through the inside of the stator 71 and cools the stator 71. Further, the exhaust winds WL, WR from the fan 4 to each main body exhaust hole 56 pass outside the power transmission housing 20. Thus, the power transmission housing 20 and the members inside it are cooled by the exhaust winds WL, WR. Furthermore, the controller 40 is cooled by the exhaust wind WD from the fan 4 to each lower exhaust hole 48. The exhaust wind WD passes through the side of the controller case 44 covering the control circuit board 42. Thus, the exhaust wind WD cools the control circuit board 42 sufficiently. Also, the exhaust wind W1 passes above the power transmission housing 20, the exhaust wind W2 passes radially inward of the release drum 202, and the exhaust wind W3 passes in front of the power transmission housing 20. Thus, the power transmission housing 20 and the members inside it, as well as the members in front of it, are cooled by the exhaust winds W1 to W3. Further, since the exhaust wind W1 branches into the exhaust winds W2 and W3, the air volume of the exhaust wind W2 directed toward the blade holding portion 138 side is suppressed compared to the case where there is no branching. Therefore, the occurrence of a situation where dust generated in the workpiece flutters is suppressed. Although the exhaust wind W3 finally goes forward, it goes forward around the guide shoe mechanism 8 below rather than the blade holding portion 138 and does not point toward the blade holding portion 138 side, so the occurrence of a situation where dust generated in the workpiece flutters is suppressed.

[0079] When the user turns off the trigger switch main body 34 by operating the trigger 33, the motor shaft 80 of the motor 3 stops, and various forward and backward movements and intake and exhaust stop. Also, after a predetermined time has elapsed, the light 62 goes out.

[0080] When the user opens the lock lever 249 and pulls the shoe 229 far forward without pushing the pin 240 through the bulging portion 22P of the cover 22, the shoe 229 stops at the foremost slide position and cannot be removed because the large-diameter portion 240B of the pin 240 interferes with the left convex portion 226J and the right convex portion 226P. Since the shoe supporter 226 has a rear end portion that protrudes rearward from the left convex portion 226J and the right convex portion 226P, the shoe 229 is sufficiently stably supported even at the foremost slide position. The user can easily set the shoe 229 at the foremost slide position by closing and locking the lock lever 249 with respect to the shoe 229 stopped at the foremost slide position. The shoe 229 at the foremost slide position is locked at the left locked portion 226K and the right locked portion 226Q at the rearmost. On the other hand, when the user opens the lock lever 249 and pushes the pin 240 through the bulging portion 22P of the cover 22, interference of the pin 240 with the left convex portion 226J and the right convex portion 226P is avoided, and the shoe 229 can move forward beyond the foremost slide position and can be removed. The user can separate the shoe 229 by operating the bulging portion 22P (pin 240) located adjacent to (rear side) the opened lock lever 249, and the operation for separating the shoe 229 is easy to perform.

[0081] Note that the embodiments and modification examples of the present invention are not limited to those described above. For example, the following changes may be further appropriately made to the embodiments and modification examples of the present invention. In the pin mechanism 228, the lower end of the large-diameter portion 240B of the pin 240 may be rounded, or the shape of the pin 240 may be spherical. In these cases, when the shoe 229 is pulled out to the foremost slide position without operating the pin 240, a catch is once generated. When the shoe 229 is further pulled forward with a pulling force equal to or greater than a predetermined level, the pin 240 rides over the left convex portion 226J and the right convex portion 226P, the shoe 229 can move beyond the foremost slide position, and it can be extracted. Also, by the reverse procedure, the removed shoe 229 can be mounted.

[0082] The orbital motion (locus motion) such as the blade holding portion 138 is not limited to an elliptical shape and a semi-elliptical shape. For example, the orbital motion may be one that reciprocates along a virtual semi-elliptical arc (swing-like). The first plane 176 does not have to be a series of planes including the first portion 176a and the second portion 176b. For example, the first plane 176 may have a first portion 176a that is a plane and a second portion 176b that is a plane separated from the first portion 176a, and directly or indirectly support the slider 6 with the first portion 176a and the second portion 176b. At least one of the first portion 176a and the second portion 176b may be a protrusion that protrudes from the surrounding portion.

[0083] The cam portion 130 may be arc-shaped when viewed from above, or may be linear or curved. The cam portion 130 may be provided on the lower surface of the crank cam 108. The cam portion 130 may be separate from the crank cam 108. At least one of a part or all of the reciprocating motion conversion mechanism 5 and the orbital switching mechanism 14 (orbital switching lever 170) may be disposed above the slider support 161. Instead of using a crank cam 108 that extends in the front-rear, left-right directions (transverse crank type), the reciprocating motion conversion mechanism 5 may be a type that uses a crank and a connecting rod (connecting rod type), or a type that uses a rotating body having an inclined cylindrical surface and a swash bearing provided on the inclined cylindrical surface (swash type).

[0084] The main body exhaust hole 56 may be arranged in a portion of the cover 22 in front of the reciprocating motion conversion mechanism 5. The main body exhaust hole 56 may be arranged in the power transmission housing 20. The lower exhaust hole 48 may be arranged outside the controller 40. The cover 22 may be a half cover having a left cover portion and a right cover portion. The needle bearing may be used instead of the ball bearing, or the ball bearing may be used instead of the needle bearing. At least one of the torque limit mechanism 102 and the intermediate shaft 104 may be omitted. The size, arrangement, or number of at least any one of the intake hole 31, the main body exhaust hole 56, and the lower exhaust hole 48 may be changed. The attachment and detachment direction of the battery 54 may be changed from the front-rear direction. The number of attachable batteries 54 may be changed to a plurality. The presence or absence, number, material, shape, type, arrangement, etc. of various members may be changed in various ways. The tip tool may be other than the blade. Instead of power supply by the battery 54, power supply by a cord may be made. The cord may be connected to a commercial power supply. The embodiments of the present invention and their modification examples can be applied to reciprocating cutting tools (for example, jigsaws) other than the reciprocating saw 1, and can also be applied to reciprocating tools, power tools, gardening tools, and power working machines other than reciprocating cutting tools.

Explanation of reference numerals

[0085] 1 reciprocating saw (reciprocating cutting tool), 3 motor, 5 reciprocating conversion mechanism, 6 slider, 20 power transmission housing, 20 lower power transmission housing, 220 shoe plate, 222 shoe guide plate, 222H hole, 226 shoe supporter, 226B bottom plate portion, 226J left convex portion (convex portion), 226K left engaged portion, 226L left wall portion, 226P right convex portion (convex portion), 226Q right engaged portion, 226R right wall portion, 226S slit, 229 shoe, 230 screw, 240 pin, 250 shoe supporter locking shaft, 250C left cylindrical surface portion (cylindrical surface portion), 250D right cylindrical surface portion (cylindrical surface portion), 250F left flat surface portion (flat surface portion), 250G right flat surface portion (flat surface portion), 254 shoe lock mechanism.

Claims

1. A motor, a rod-shaped slider provided with a tip tool holding portion for holding a tip tool at the tip, a reciprocating motion conversion mechanism that converts the rotation of the motor into a reciprocating motion in the front-rear direction and transmits it to the slider, with the extending direction of the slider being the front-rear direction, a shoe that is adjacent to the tip tool, can contact a workpiece on which the tip tool acts, and is slidable in the front-rear direction, a shoe lock mechanism that can be locked to the shoe, a pin that can interfere with the shoe, and comprising: the shoe lock mechanism suppresses the sliding of the shoe by locking to the shoe, and allows the sliding of the shoe by releasing the locking to the shoe, the pin interferes with the shoe slid to a predetermined position and is movable to a position where it does not interfere with the shoe by operation, the shoe is separable from parts other than the shoe when not locked to the shoe lock mechanism and not interfered with by the pin, the predetermined position is the most forward position where the shoe is locked to the shoe lock mechanism, the shoe has a shoe plate that contacts the workpiece and a shoe supporter that supports the shoe plate, the shoe supporter has a slit extending in the front-rear direction, the slit has a slit narrowing portion for narrowing its width, the pin enters the slit and interferes with the slit narrowing portion A reciprocating cutting tool characterized by the above.

2. A motor, a rod-shaped slider provided with a tip tool holding portion for holding a tip tool at the tip, a reciprocating motion conversion mechanism that converts the rotation of the motor into a reciprocating motion in the front-rear direction and transmits it to the slider, with the extending direction of the slider being the front-rear direction, a shoe that is adjacent to the tip tool, can contact a workpiece on which the tip tool acts, and is slidable in the front-rear direction, a shoe lock mechanism that can be locked to the shoe, a pin that can interfere with the shoe, and comprising: the shoe lock mechanism suppresses the sliding of the shoe by locking to the shoe, and allows the sliding of the shoe by releasing the locking to the shoe, the pin interferes with the shoe slid to a predetermined position and is movable to a position where it does not interfere with the shoe by operation, When the shoe is not locked by the shoe locking mechanism and does not interfere with the pin, it can be separated from the parts other than the shoe. The predetermined position is the most forward position where the shoe is locked by the shoe locking mechanism. The shoe has a shoe plate that contacts the workpiece and a shoe supporter that supports the shoe plate. The shoe supporter extends in the front-rear direction and has a slit that extends in the front-rear direction, a bottom plate portion, a left wall portion that stands up from the left side of the bottom plate portion, and a right wall portion that stands up from the right side of the bottom plate portion. The pin is inserted into the slit. The shoe locking mechanism has a columnar shoe supporter locking shaft that has a flat surface portion and a cylindrical surface portion and is rotatable around a central axis. At least one of the left wall portion and the right wall portion has a portion to be locked that is locked to the cylindrical surface portion of the shoe supporter locking shaft. By the rotation of the shoe supporter locking shaft, the flat surface portion faces the portion to be locked, the cylindrical surface portion disengages from the portion to be locked, and the locking of the shoe by the shoe supporter locking shaft is released. A reciprocating cutting tool characterized by the above.

3. Furthermore, it is provided with a pin operation portion for moving the pin. The pin has a small diameter portion and a large diameter portion, and is inserted into the slit. The large diameter portion interferes with the slit narrowing portion in the shoe slid to a predetermined position. The pin can be moved by an operation on the pin operation portion so that the large diameter portion disengages from the slit and the small diameter portion is located within the slit. When the small diameter portion is located within the slit, it can pass through the slit narrowing portion, and by this passing, the shoe is separated from the parts other than the shoe. The reciprocating cutting tool according to claim 1, characterized by the above.

4. A motor, A rod-shaped slider provided with a tip tool holding portion for holding a tip tool at the tip portion, A reciprocating motion conversion mechanism that sets the extending direction of the slider as the front-rear direction, converts the rotation of the motor into a reciprocating motion in the front-rear direction, and transmits it to the slider, A shoe that is adjacent to the tip tool, can contact the workpiece on which the tip tool acts, and is slidable in the front-rear direction, A shoe locking mechanism that can lock the shoe, A pin that can interfere with the shoe, A pin operation portion for moving the pin, and is provided with the above. The shoe lock mechanism suppresses the sliding of the shoe by locking the shoe, and allows the sliding of the shoe by releasing the locking of the shoe. The shoe has a shoe plate that contacts the workpiece and a shoe supporter that supports the shoe plate. The shoe supporter has a slit that extends in the front-rear direction. The slit has a slit narrowing portion for narrowing its width. The pin has a small-diameter portion and a large-diameter portion, and is inserted into the slit. The large-diameter portion interferes with a convex portion on the shoe that has been slid to a predetermined position. The pin is movable by an operation on the pin operation portion so that the large-diameter portion disengages from the slit and the small-diameter portion is positioned within the slit. When the small-diameter portion is positioned within the slit, it can pass through the slit narrowing portion, and by this passing, the shoe is separated from parts other than the shoe. A reciprocating cutting tool characterized by the above.

5. The shoe supporter extends in the front-rear direction and has a bottom plate portion, a left wall portion that stands up from the left side of the bottom plate portion, and a right wall portion that stands up from the right side of the bottom plate portion. The reciprocating cutting tool according to any one of Claims 1, 3, or 4, characterized by the above.

6. The shoe lock mechanism has a shoe supporter locking shaft that is columnar with a flat surface portion and a cylindrical surface portion and is rotatable around a central axis. At least one of the left wall portion and the right wall portion has a portion to be locked that is locked to the cylindrical surface portion of the shoe supporter locking shaft. By the rotation of the shoe supporter locking shaft, the flat surface portion faces the portion to be locked, the cylindrical surface portion disengages from the portion to be locked, and the locking of the shoe by the shoe supporter locking shaft is released. The reciprocating cutting tool according to Claim 5, characterized by the above.

7. The shoe plate is supported by at least one of the left wall portion and the right wall portion. The reciprocating cutting tool according to Claim 5 or Claim 6, characterized by the above.

8. A shoe guide plate for guiding the shoe supporter is provided. The reciprocating cutting tool according to any one of Claims 1 to 7, characterized by the above.

9. The shoe guide plate has a hole through which the pin passes. The reciprocating cutting tool according to Claim 8, characterized by the above.

10. A power transmission housing for holding the reciprocating conversion mechanism is provided. The reciprocating cutting tool according to claim 8 or claim 9, characterized in that.

11. The shoe supporter is disposed between the power transmission housing and the shoe guide plate. The reciprocating cutting tool according to claim 10, characterized in that.

12. The shoe guide plate is fixed to the power transmission housing by screws. The screws pass through the slits. The reciprocating cutting tool according to claim 11, characterized in that.

13. The pin is biased to a position where it interferes with the shoe. The reciprocating cutting tool according to any one of claims 1 to 12, characterized in that.

14. The pin is adjacent to the shoe locking mechanism. The reciprocating cutting tool according to any one of claims 1 to 13, characterized in that.

15. The predetermined position is the most forward position where the shoe is locked to the shoe locking mechanism. The reciprocating cutting tool according to any one of claims 4 to 14, characterized in that.

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