Reciprocating motion type cutting tool

Abstract

The invention provides a reciprocating motion type cutting tool. A reciprocating cutting tool (1) is provided with a saw blade attachment / detachment unit (32) which is capable of reciprocating and is capable of attaching / detaching a saw blade (34), said saw blade attachment / detachment unit comprising: a first pressing member (130) which is capable of pressing the saw blade (34) while being capable of moving in a direction close to or away from the saw blade (34), a first biasing member (134), a second pressing member (142), and a second biasing member (144); a first biasing member that biases the first pressing member (130); a second pressing member capable of pressing the saw blade (34) in a direction different from the direction in which the first pressing member (130) presses the saw blade (34); the second urging member urges the second pressing member, and when the second pressing member is pressed by the saw blade, the first pressing member automatically presses the saw blade, and the first urging member is disposed at a position away from the moving direction of the first pressing member. Therefore, the saw blade can be easily disassembled and assembled.

Description

Technical Field

[0001] This invention relates to a reciprocating cutting tool such as a jigsaw or a reciprocating saw. Background Technology

[0002] A wire saw is known from Japanese Patent Publication No. 2002-254403 (Patent Document 1). The wire saw 10 has a clamping device 26 for the saw blade 22. The clamping device 26 switches the saw blade 22 to an unlocked state and a locked state by rotating the sleeve 33. The sleeve 33 is subjected to a force in the rotational direction by a helical spring 44. In the locked state, the clamping device 26 holds the saw blade 22 by a pin 42 pressed by a cam 33c of the sleeve 33 and the wall surface 37j of the slit 37a of the rod 37. The helical spring 44 is arranged radially outward of the pin 42 used to press the saw blade 22. When disassembling or assembling the saw blade 22, the user needs to handle the saw blade 22 while maintaining the open operation of the operating part 52 and keeping the sleeve 33 in the unlocked state.

[0003] In addition, a saw blade mounting device for a wire saw is known from Japanese Patent Publication No. 2011-255449 (Patent Document 2). The saw blade mounting device 10 includes a rod portion 11, a saw blade guide 12, a guide engagement member 20, a saw blade retainer 13, an operating member 14, and a torsion spring 18. The saw blade guide 12 is cylindrical and is held at the lower end of the rod portion 11 by a cylindrical guide support member 15. The guide engagement member 20 is disposed on the lower side of the guide support member 15. The saw blade retainer 13 and the operating member 14 are both cylindrical and are assembled together with the guide support member 15 and the guide engagement member 20 housed on their inner circumferences. The torsion spring 18 is clamped between the operating member 14 and the guide engagement member 20. The torsion spring 18 exerts a force on the operating member 14 in the rotational direction toward the saw blade mounting position.

[0004] The saw blade guide 12 is housed in the inner circumferential hole of the rod portion 11 in a manner that allows axial movement. The saw blade guide 12 is pressed inward by pressing in the saw blade B, which is housed in the guide groove 12c of the saw blade guide 12. Consequently, the pair of anti-rotation edges 12a of the saw blade guide 12 disengage from the corresponding engaging grooves 13f of the saw blade holder 13. Furthermore, the operating member 14 automatically rotates towards the saw blade mounting position by the force of the torsion spring 18. The saw blade B has a pair of engaging ears Bb. The engaging ears Bb are held vertically by the corresponding limiting groove 20a of the guide engagement member 20 and the corresponding cam portion 13e of the saw blade holder 13, which has rotated to the saw blade mounting position. Summary of the Invention [The technical problem that the invention aims to solve]

[0005] In the clamping device 26 of Patent Document 1, the helical spring 44 is positioned radially outside the pin 42 used to press the saw blade 22. This results in a large diameter clamping device 26. Consequently, the large diameter makes it difficult for the user to visually inspect the area near the saw blade 22 during operation. Furthermore, in the clamping device 26, maintaining the open operation of the operating component 52 is required when installing or removing the saw blade 22, which is laborious. Furthermore, in the saw blade mounting device 10 of Patent Document 2, the engagement ears Bb of the saw blade B are clamped from above and below. Therefore, the engagement ears Bb are prone to wear. This causes changes in the mounting angle of the saw blade B, thus affecting its operability.

[0006] The purpose of this invention is to provide a reciprocating cutting tool with an easily detachable saw blade. [Technical solutions used to solve technical problems]

[0007] The first aspect of the present invention is a reciprocating cutting tool having a saw blade assembly / disassembly section, which is reciprocating and capable of assembling and disassembling the saw blade. The saw blade assembly / disassembly unit includes a first pressing component, a first force-applying component, a second pressing component, and a second force-applying component, wherein, The first pressing component can move in a direction approaching or away from the saw blade and can press the saw blade; The first force-applying component applies force to the first pressing component; The second pressing component can press the saw blade in a direction different from the pressing direction of the first pressing component; The second force-applying component applies force to the second pressing component. When the second pressing component is pressed in by the saw blade, the first pressing component automatically presses down on the saw blade. The first force-applying component is positioned to avoid the direction of movement of the first pressing component.

[0008] The second aspect of the present invention is a reciprocating cutting tool having a saw blade assembly / disassembly section, which is reciprocating and capable of assembling and disassembling the saw blade. The saw blade assembly / disassembly unit includes a sleeve, a first pressing component, a first force-applying component, a second pressing component, and a second force-applying component, wherein... The sleeve can rotate about the direction of reciprocating motion of the saw blade assembly / disassembly part, and has a locking part; The first pressing component is disposed on the radial inner side of the sleeve and moves as the sleeve rotates. The first pressing component can move in a direction close to or away from the saw blade and can press the saw blade. The first force-applying component is disposed on the radial inner side of the sleeve and applies force to the first pressing component; The second pressing component can press the saw blade in the direction of the reciprocating motion of the saw blade assembly / disassembly part; The second pressing component has an engaging part, a pressing part, and a tongue, wherein... The engaging portion prevents the sleeve from rotating by engaging with the engaged portion; The pressing part extends along the reciprocating motion direction of the saw blade disassembly and assembly part; The tongue connects the engaging part and the pressing part into one unit, and extends along the reciprocating direction of the saw blade assembly / disassembly part. Furthermore, the tongue deviates from the imaginary center line of the pressing part in a direction orthogonal to the reciprocating direction of the saw blade assembly / disassembly part. The second force-applying component applies force to the second pressing component. When the pressing part is pressed by the saw blade, the engaging part moves and disengages from the engaged part. Invention Effects

[0009] The reciprocating cutting tool according to the present invention allows for easy assembly and disassembly of the saw blade. Attached Figure Description

[0010] Figure 1 This is a perspective view of the front surface, upper surface, and left surface of the wire saw in the embodiment. Figure 2 yes Figure 1 Central longitudinal section view of the wire saw. Figure 3 yes Figure 2 AA sectional view. Figure 4 This is an exploded perspective view of the upper surface, front surface, and left surface of the saw blade, saw blade holder, and sliding body of the wire saw in the embodiment. Figure 5 This is an exploded perspective view of the lower surface, rear surface, and right surface of the saw blade, saw blade holder, and sliding body of the wire saw in the embodiment. Figure 6 This is a perspective view of the rear half of the sleeve in the saw blade retainer of the embodiment when the saw blade is locked. Figure 7A This is a bottom view of the saw blade retainer before the saw blade is inserted. Figure 7B This is a bottom view of the saw blade retainer when the saw blade is locked. Figure 8A This is a cross-sectional view (AA) of the saw blade retainer before and during saw blade insertion. Figure 8B yes Figure 8A CC section view. Figure 9A This is a cross-sectional view (AA) of the saw blade retainer part when the saw blade is pressed in. Figure 9B yes Figure 9A DD sectional view. Figure 10A This is a cross-sectional view (AA) of the saw blade retainer when the saw blade is locked. Figure 10B yes Figure 10A EE sectional view. Figure 11A yes Figure 8B FF sectional view. Figure 11B yes Figure 9B GG cross-sectional view. Figure 11C yes Figure 10B HH cross-sectional view. [Explanation of reference numerals in the attached figures] 1: Wire saw; 32: Saw blade retainer; 34: Saw blade; 130: First pressing member; 132: Sleeve; 132C: First cam surface (cam surface); 132G: Engaging part guide (engaged part); 134: First force-applying member; 142: Second pressing member; 142F: Engaging part; 142P: Pressing part; 142T: Tongue; 144: Second force-applying member. Detailed Implementation

[0011] Hereinafter, embodiments of the present invention will be described appropriately with reference to the accompanying drawings. Modifications to these embodiments are included in this description. The present invention is not limited to these embodiments and modifications. The terms "front and back," "up and down," and "left and right" in this method and its variations are for ease of explanation and may vary depending on the working conditions and at least one of the movement of the components.

[0012] Figure 1 This is a perspective view of the front surface, upper surface, and left surface of a wire saw 1, which is an example of a reciprocating motion cutting tool in an embodiment. Figure 2 This is the central longitudinal section view of wire saw 1. Figure 3 yes Figure 2 AA sectional view. The wire saw 1 has a main body 2, a base 6, and a rechargeable battery 8. The wire saw 1 is a rechargeable wire saw powered by the battery 8. The battery 8 is a power tool-specific battery. Alternatively, the battery 8 can also be considered a structural element of the main body 2. Furthermore, the battery 8 can be a structural element independent of the wire saw 1. The battery 8 can also be a primary battery. The battery 8 does not necessarily have to be a power tool-specific battery; for example, it can be a general-purpose battery. A power cord that connects to a power source can also be used instead of the battery 8. A wire saw with a power cord that connects to an AC power source is an AC-type wire saw. exist Figure 2 In the middle, the right side becomes the front of the wire saw 1. In Figure 2 In the middle, the top is above the wire saw 1. Figures 1 to 3 This refers to wire saw 1 when the saw blade is locked.

[0013] Viewed from left to right, the main body 2 is L-shaped overall. The main body 2 has a front part 2F at the front. The front part 2F extends vertically. The main body 2 has a rear part 2B at the rear. The rear part 2B extends rearward from the lower rear side of the front part 2F. The rear part 2B is barrel-shaped.

[0014] The main body 2 includes a housing 10, an electric motor 12, a fan 14, a rear bearing 15, a front bearing 16, a battery mounting section 18, a controller 20, a speed adjustment switch 22, a main body connector 24, a switch unit 25, multiple (2) ON / OFF switches 26, multiple (2) locking switches 27, a power transmission section 28, a slider 29 serving as an output section, a slider guide 30, a dustproof seal 31, a saw blade holder 32 serving as a saw blade mounting and dismounting section, a saw blade 34 serving as a top tool, a tool opener 35, a track movement section 36, a track switching section 37, a counterweight section 38, and a protective cover 39.

[0015] The main components inside the main body 2 are arranged sequentially from the rear, including a battery mounting section 18, a controller 20, a main body connector 24, a rear bearing 15, an electric motor 12, a fan 14, a front bearing 16, a power transmission section 28, a track motion section 36, a counterweight section 38, a sliding member 29, a saw blade retainer 32, a switch unit 25, a protective cover 39, and a tool opener 35.

[0016] Furthermore, the configuration of various components and parts can be modified in various ways. The saw blade 34 may not be a structural element of the main body 2 or the wire saw 1, but rather a structural element independent of the main body 2 or the wire saw 1. The slider 29 may also be a structural element of the power transmission unit 28, and the saw blade holder 32 may be considered as an output unit. The slider 29 and the saw blade holder 32 may also be used together as an output unit. A handle unit may also be provided that is combined with the main body 2 to form a ring shape.

[0017] The shell 10 forms the outer contour of the main body 2. The housing 10 holds various components directly or indirectly. The housing 10 has a main housing 40 and a gearbox 42.

[0018] The main housing 40 is made of plastic. The main housing 40 is split, having a left main housing 40L and a right main housing 40R. The left main housing 40L has multiple threaded bosses 40B. The right main housing 40R has threaded holes. The threaded holes have threaded holes corresponding to the threaded bosses 40B. The left main housing 40L and the right main housing 40R are assembled by screws 43 that are screwed into the threaded holes and threaded bosses 40B. Viewed from right to left, the main housing 40 is L-shaped. The upper part of the main housing 40 is for the user to hold. A rear-lower opening is formed at the rear lower part of the main housing 40. A front-lower opening is formed at the front lower part of the main housing 40.

[0019] The main housing 40 has multiple air inlets 44 and multiple exhaust outlets 47. Each air inlet 44 extends in the front-to-back direction. Some of the air inlets 44 are arranged vertically in the center of the left main housing 40L in the front-to-back direction. Other air inlets 44 are arranged vertically in the center of the right main housing 40R in the front-to-back direction. Each exhaust port 47 extends in the front-to-back direction. Some of the exhaust ports 47 are located on the upper part of the left main housing 40L. Other exhaust ports 47 are located on the upper part of the right main housing 40R. The electric motor 12 is cooled by air drawn in through each air inlet 44 by the negative pressure generated by the rotation of the fan 14. Most of the air after cooling the electric motor 12 is exhausted as blower air between the two sections of the base 110. The remaining air after cooling the electric motor 12 is discharged through each exhaust port 47.

[0020] Gearbox 42 is made of die-cast aluminum alloy. Gearbox 42 is bell-shaped with an opening at the lower end. Gearbox 42 is split, consisting of a front gearbox 42F and a rear gearbox 42B. The front gearbox 42F has threaded holes on the upper right, lower right, and upper left. The rear gearbox 42B has threaded bosses corresponding to the threaded holes. The front gearbox 42F and the rear gearbox 42B are assembled by screws screwed into the threaded holes and threaded bosses.

[0021] The gearbox 42 is held in the main housing 40. The gearbox 42 directly or indirectly holds the power transmission unit 28, the track motion unit 36, the counterweight unit 38, the sliding member 29, and the saw blade holder 32. The lower rear part of the gearbox 42 protrudes downward from the lower front opening of the main housing 40. The rear surface of the gearbox 42 has an upper hole, an upper opening, and a middle opening.

[0022] The housing 10 can be modified in various ways. For example, in the main housing 40, the outer contour portions of the front part 2F and the rear part 2B of the main body can be separate structures that can be combined with each other. In the split main housing 40, at least one of the left main housing 40L and the right main housing 40R can be significantly different in size and shape. The left main housing 40L and the right main housing 40R can also be combined by means other than threaded connection (screws) using locking parts such as claws and locking parts such as claw holes. The gearbox 42 can also be a single structure instead of being separate. The main housing 40 and the gearbox 42 can also be a single structure. The material of various parts in the housing 10 and at least one of the number and arrangement of openings can also be changed. At least one of the number and arrangement of exhaust ports 47 can also be appropriately changed.

[0023] The electric motor 12 is a brushless motor, a DC motor. The electric motor 12 is held in the main housing 40. The main housing 40 is used to hold the electric motor 12 and can therefore be regarded as the motor housing. The electric motor 12 has a stator 51 and a rotor 52. The stator 51 is cylindrical. The stator 51 is held in the main housing 40 with its imaginary central axis extending in the front-rear direction. The rotor 52 has a motor shaft 53 extending in the front-rear direction. The rotor 52 is cylindrical, and the motor shaft 53 passes through its center. The rotor 52 is disposed radially inside the stator 51. The rotor 52 rotates around the motor shaft 53. A small gear portion 54 is formed at the front end of the motor shaft 53.

[0024] The fan 14 is fixed to the motor shaft 53 as one unit. Fan 14 is a centrifugal fan. Alternatively, fan 14 could also be an axial fan or other types of fan. The rear part of the lower opening of the main housing 40 is located radially outward of the fan 14.

[0025] The rear bearing 15 is a ball bearing. The rear bearing 15 rotatably supports the motor shaft 53. The rear bearing 15 is positioned between the electric motor 12 and the controller 20. The outer ring of the rear bearing 15 is held in the main housing 40. The front bearing 16 is a ball bearing. The front bearing 16 rotatably supports the motor shaft 53. The front bearing 16 is positioned between the fan 14 and the pinion gear 54. The front bearing 16 is located on the front side of the fan 14. The outer ring of the front bearing 16 is held in the central opening of the gearbox 42. Furthermore, at least one of the rear bearing 15 and the front bearing 16 can also be another type of bearing. For example, the rear bearing 15 can also be a needle roller bearing. The types of other various bearings can also be changed in the same way.

[0026] The battery mounting part 18 is located at the rear end of the main body part 2. A battery 8 is mounted on the battery mounting section 18. The battery mounting section 18 has a main body side terminal that connects to the terminals of the battery 8. The main body side terminal is disposed within the rear lower opening of the main housing 40.

[0027] Battery 8 is mounted on the lower side of battery mounting portion 18. With the terminals of battery 8 facing upwards, battery 8 is mounted by sliding forward from the rear side of battery mounting portion 18. The sliding mounting direction of battery 8 can also be any direction other than the rear-to-forward direction. Battery 8 can also be mounted in a manner other than sliding mounting. Battery 8 is a 36V lithium-ion battery. Battery 8 is housed in a plastic battery case and contains eight cells (not shown). Each cell is a cylindrical shape, elongated axially, extending laterally when battery 8 is installed. Battery 8 provides the electrical power to drive the electric motor 12. Alternatively, battery 8 can be any lithium-ion battery, such as 10.8V, 14.4V, 18V, 25.2V, or 28V. Battery 8 can also be a lithium-ion battery with a voltage below 10.8V or above 36V. Battery 8 can also be other types of batteries. Multiple batteries 8 can also be used.

[0028] The controller 20 is held on the upper side of the battery mounting section 18. The controller 20 controls the electric motor 12. The electric motor 12 is electrically connected to the controller 20. The main body side terminal of the battery mounting section 18 is electrically connected to the electric motor 12 via the main body connector 24. The controller 20 is electrically connected to the speed regulation switch 22, the switch unit 25, the on / off switch 26, and the locking switch 27, respectively.

[0029] The speed adjustment switch 22 is a dial-type switch. The speed adjustment switch 22 has a dial portion that extends forward, backward, left, and right. The dial portion is rotatable about an imaginary central axis extending vertically. The left side of the dial portion protrudes from a hole formed on the left surface of the main housing 40. The user rotates the dial portion by turning the left side forward or backward. The speed adjustment switch 22 outputs a signal corresponding to the amount of rotation of the dial portion. The output signal is sent to the controller 20. Alternatively, the speed adjustment switch 22 can be omitted.

[0030] The main body connector 24 is clamped to the wire (not shown) that connects the controller 20 to the main body side terminal of the battery mounting part 18. The main body connector 24 can be detached in a reconnectable manner. In the event that the electric motor 12 needs to be replaced due to malfunction or other reasons, the electric motor 12 can be easily replaced by detaching the main body connector 24. In this case, the controller 20 connected to the electric motor 12 is also replaced simultaneously. Alternatively, the main body connector 24 can be omitted.

[0031] The switch unit 25 is disposed on the upper side of the cover 39 in the main body 2. The switch unit 25 is held in the housing 10. The switching unit 25 has a light source (not shown). The light source is, for example, an LED (Light Emitting Diode). The light source illuminates the workpiece and its surrounding area processed by the saw blade 34. The light source illuminates or extinguishes in response to the switching of the locking switch 27. When the locking switch 27 is closed, the light source is on. When the on / off switch 26 is off, the light source is off after a predetermined time. If the locking switch 27 is off, the light source is off immediately. The light source is controlled by controller 20. Switch unit 25 is connected to controller 20 via wires (not shown). Alternatively, the light source can be omitted. The light source can also be separate from the switch unit 25. The method of turning the light source on and off is not limited to the methods described above. For example, the light source can also be turned on and off using a dedicated light source switch.

[0032] Each on / off switch 26 is a tact switch. The left on / off switch 26 is located at the front left of the main housing 40. The right on / off switch 26 is located at the front right of the main housing 40. The on / off switch 26 alternately sends an on signal or an off signal to the controller 20 whenever it receives a press operation from the user.

[0033] Each locking switch 27 is a tactile switch. The left locking switch 27 is located on the front left side of the main housing 40, above the on / off switch 26. The right locking switch 27 is located on the front right side of the main housing 40, above the on / off switch 26. Whenever the locking switch 27 receives a press operation from the user, it alternately sends an on or off signal to the controller 20. Furthermore, at least one of the on / off switch 26 and the locking switch 27 can be modified in various ways. For example, the on / off switch 26 can also be a toggle switch instead of a touch switch. Other switch forms can also be modified in the same way.

[0034] When the controller 20 receives an on signal from the locking switch 27, it starts a timer to track the elapsed time. If, after receiving the on signal but before the elapsed time, the controller 20 receives an on signal from the on / off switch 2, it switches on the power to the wire saw 1 and drives the electric motor 12. The controller 20 controls the rotation speed of the electric motor 12 based on a signal corresponding to the amount of rotation of the disc from the speed adjustment switch 22. On the other hand, when the power supply to the wire saw 1 is on, the controller 20 disconnects the power supply to the wire saw 1 and stops the electric motor 12 when it receives a disconnect signal from the on / off switch 26. When the power supply is on, if the locking switch 27 is opened, the electric motor 12 stops and the light source is turned off. Furthermore, the controller 20 can control the power supply of the wire saw 1, etc., in ways other than those described above. Various modifications can also be made to other controls.

[0035] The power transmission unit 28 transmits the power from the electric motor 12 to the saw blade 34 via the slider 29 and the saw blade holder 32. The slider 29 is square-column shaped and extends vertically. The saw blade holder 32 is held at the lower end of the slider 29. The slider 29 is capable of reciprocating in the vertical direction. The saw blade holder 32 is also capable of reciprocating in the vertical direction. The power transmission section 28 includes an intermediate gear 65, a support shaft 66, a spacer 67, multiple (two) needle roller bearings 68, and a guide roller section 69.

[0036] The intermediate gear 65 has a gear portion 65G, a first cam portion 65E, and a second cam portion 65F. The intermediate gear 65 is a cylindrical shape extending back and forth. The intermediate gear 65 reduces the rotation of the motor shaft 53 and transmits the speed to the sliding member 29. Gear section 65G is disposed at the front of intermediate gear 65. Multiple teeth are formed on the outer curved surface of gear section 65G. The outer diameter of gear section 65G is larger than the outer diameter of the rear part of intermediate gear 65. Gear section 65G meshes with pinion section 54. The first cam portion 65E is disposed at the rear of the intermediate gear 65. The outer surface of the first cam portion 65E is a cylindrical surface that is eccentric to the central axis in the imaginary front-rear direction relative to the intermediate gear 65. The second cam portion 65F is disposed in the center of the intermediate gear 65. The outer surface of the second cam portion 65F is a cylindrical surface that is eccentric to the central axis in the imaginary front-rear direction relative to the intermediate gear 65.

[0037] The support shaft 66 is cylindrical and extends in the front-to-back direction. The rear part of the support shaft 66 is fixed to the upper opening of the gearbox 42 via a cylindrical spacer 67. The support shaft 66 protrudes forward from the rear inner surface of the gearbox 42.

[0038] Each needle roller bearing 68 is arranged around the central portion of the support shaft 66. Two needle roller bearings 68 are arranged one in front of the other. Each needle roller bearing 68 supports the intermediate gear 65 so that it can rotate about its imaginary central axis. Each needle roller bearing 68 and the support shaft 66 are arranged radially inside the intermediate gear 65.

[0039] The guide roller section 69 has a shaft 70, a needle roller bearing 72, and a guide roller 74. The shaft 70 is cylindrical. The shaft 70 extends in the front-to-back direction. The rear part of the shaft 70 is fixed to the gear part 65G. The shaft 70 is positioned eccentrically within the gear part 65G. The shaft 70 protrudes forward from the front surface of the gear part 65G. The needle roller bearing 72 is supported at the front of the shaft 70. The guide roller 74 is cylindrical. Supported by a needle roller bearing 72, the guide roller 74 is rotatable about an imaginary central axis in a front-rear direction. The guide roller 74 is positioned on the front side of the gear section 65G.

[0040] The slider 29 extends in the vertical direction and can move up and down. The slider 29 has a roller guide 80, a shaft 82 and a slider body 84. The roller guide 80 extends in the left-right direction. The roller guide 80 has a groove extending in the left-right direction. The guide roller 74 enters the groove of the roller guide 80 in a left-right movable manner. The shaft 82 is cylindrical and extends in the left-right direction. The slider body 84 is a square tube extending vertically. The slider body 84 is mounted on the roller guide 80 via a shaft 82. The shaft 82 passes through the lower end of the roller guide 80 and the upper end of the slider body 84. The slider body 84 can swing back and forth around the shaft 82. The guide roller 74, located eccentrically on the intermediate gear 65, moves left and right within the roller guide 80 of the slider 29, thereby transmitting vertical movement only to the roller guide 80. Therefore, the slider 29 reciprocates vertically via the rotation of the intermediate gear 65. The guide roller 74 and the roller guide 80 convert rotational force into reciprocating motion.

[0041] The slider guide 30 is cylindrical and extends vertically. The slider body 84 passes through the radially inner side of the slider guide 30. The slider guide 30 guides the reciprocating slider 29. The slider guide 30 is held in the gearbox 42. The dust seal 31 is annular and elastic. The dust seal 31 is held in the gearbox 42. The sliding body 84 passes radially inside the inner hole of the dust seal 31. The dust seal 31 contacts the sliding member 29, preventing dust from entering the housing 10.

[0042] The saw blade retainer 32 is held in place by the sliding body 84. The saw blade retainer 32 is connected to the lower end of the sliding body 84. The saw blade retainer 32 is used for attaching and detaching the saw blade 34. The saw blade 34 extends vertically. On one side of the saw blade 34 in the longitudinal direction, there is a workpiece-acting portion that acts on the workpiece. The workpiece-acting portion is, for example, a saw blade that cuts the workpiece. The saw blade 34 is mounted to the saw blade holder 32 at its upper end with the workpiece-acting portion facing forward. The saw blade 34 is mounted to the saw blade holder 32 without the need for tools such as wrenches, i.e., in a tool-free manner. The saw blade retainer 32 will be described in more detail later.

[0043] The tool opener 35 is rod-shaped and extends in the left-right direction. The tool opener 35 can rotate about an imaginary vertical axis disposed within its right end. The user can open the tool opener 35 by pushing its left end forward. A spring 86, acting as an elastic body, applies force to the tool opener 35 in the rotational direction, i.e., the closing direction, which pulls the left end of the tool opener 35 backward. The saw blade retainer 32 is adjacent to the inner side of the left end of the tool opener 35 in the left-right direction. The tool opener 35 is made of a light-transmitting resin. The tool opener 35 allows light from a light source to pass through. Alternatively, the tool opener 35 may also be opaque.

[0044] The track motion unit 36 ​​includes a push plate 90, a retainer shaft 91, a roller retainer 92, a roller shaft 94, a back pressure roller 96, and a needle roller bearing 97. The push plate 90 is a plate that extends upwards, downwards, leftwards, and rightwards. The push plate 90 has a first cam hole at its upper part. A first cam portion 65E enters the radially inner side of the first cam hole. The first cam portion 65E moves the push plate 90 up and down through the inner surface of the first cam hole. The first cam portion 65E is eccentrically positioned with a phase opposite to that of the guide roller portion 69. The retainer shaft 91 is a cylindrical shape that extends in the left-right direction.

[0045] A roller retainer 92 is disposed on the underside of a pusher plate 90. The roller retainer 92 includes an upper plate portion 92U and multiple (two) arm portions 92A. The upper plate portion 92U extends forward, backward, left, and right. Each arm portion 92A extends forward, backward, up, and down, and extends forward and downward from the left or right side of the upper plate portion 92U. A retainer shaft 91 is mounted between the central portions of each arm portion 92A. The roller retainer 92 is held in the gearbox 42 in a state where it can swing about the retainer shaft 91. The roller shaft 94 is a cylindrical shape extending in the left-right direction. The roller shaft 94 is mounted between the lower ends of each arm 92A in the roller holder 92. The back pressure roller 96 is a cylindrical shape extending in the left-right direction. The back pressure roller 96 is rotatably supported on the roller shaft 94 via a needle roller bearing 97. The back pressure roller 96 can contact the rear of the saw blade 34 without hindering the reciprocating motion of the saw blade 34.

[0046] The track switching unit 37 has a shaft part 37S and a knob part 37K. The shaft portion 37S is a shaft extending in the left-right direction. Viewed from right to left, the cross-section of the central portion of the shaft portion 37S is semi-circular. The central portion of the shaft portion 37S is semi-cylindrical. The shaft portion 37S is disposed on the upper side of the upper plate portion 92U of the roller holder 92 of the track motion portion 36, and on the rear side of the lower end of the push plate 90. The knob portion 37K is fixed to the left end of the shaft portion 37S. The knob portion 37K extends radially outward from the shaft portion 37S.

[0047] The user can rotate the track switching unit 37 around the imaginary central axis of the shaft unit 37S by operating the knob 37K. The knob 37K can rotate between the marks "0" to "III" formed on the outer surface of the gearbox 42. Between these marks, there is one recess on the side of mark "0" and one recess on the side of mark "III". Two recesses are arranged between the recess on the side of mark "0" and the recess on the side of mark "III", and close to the recess on the side of mark "III". That is, there are three recesses arranged on the side of mark "III". Alternatively, some or all of the recesses and marks can be omitted.

[0048] The user can switch the track movement mode of the saw blade 34 by operating the knob 37K as needed. The track movement mode of the saw blade 34 is based on the back pressure roller 96 that is in contact with the saw blade 34 and swings in the back and forth direction. When the knob 37K is in the "0" position, the semi-cylindrical part of the shaft 37S is in a rotating position with the curved surface facing down, and contacts the upper plate 92U of the roller holder 92. In this case, regardless of the vertical position of the push plate 90, which moves up and down via the first cam 65E, the back pressure roller 96 will remain in the same position without oscillation, and the saw blade 34 will not perform track movement.

[0049] When the knob 37K is away from the mark "0", the semi-cylindrical portion of the shaft 37S separates from the upper plate portion 92U of the roller holder 92. Therefore, the up-and-down moving push plate 90 causes the roller holder 92 and the back pressure roller 96 to oscillate via the upper plate portion 92U. Then, the back pressure roller 96 applies a force in the front-to-back direction to the saw blade 34. This force causes the sliding body 84, the saw blade holder 32, and the saw blade 34 to oscillate around the shaft 82. The saw blade 34 is subjected to a front-to-back oscillation during its up-and-down movement, thus moving along an imaginary elliptical trajectory when viewed from right to left. As the knob 37K moves away from the mark "0", the semi-cylindrical portion of the shaft 37S gradually moves away from the upper plate portion 92U. Therefore, the amplitude of the oscillation of the roller holder 92 and the back pressure roller 96 varies depending on the rotational position of the knob 37K. For example, when the knob 37K is rotated to the position marked "III", the oscillation amplitude of the roller holder 92 and the back pressure roller 96 reaches its maximum. Therefore, the mode of track movement changes according to the rotation position of the knob 37K. The track travel amount can be switched to three sizes by adjusting the knob 37K according to the positions of the three recesses or marks mentioned above.

[0050] The counterweight 38 has a counterweight 100 and a shaft 102. The counterweight 100 is a plate-shaped structure that extends upwards, downwards, leftwards, and rightwards. The counterweight 100 has a cam hole located at its center in the vertical direction and an upper hole located above the cam hole. The second cam portion 65F of the intermediate gear 65 enters the cam hole of the counterweight 100. The second cam portion 65F is eccentrically positioned with a phase opposite to that of the guide roller portion 69. The shaft 102 extends in the front-to-back direction. The shaft 102 is held in the gearbox 42. The shaft 102 is mounted between the front and rear walls of the gearbox 42. The central portion of the shaft 102 enters the upper hole of the counterweight 100. The counterweight 100 moves up and down in a phase opposite to that of the slider 29, saw blade holder 32, and saw blade 34 via the second cam portion 65F, which is eccentric to the phase opposite to that of the guide roller portion 69. Therefore, the counterweight 100 suppresses the vibration caused by the reciprocating motion of the slider 29, saw blade holder 32, and saw blade 34.

[0051] The protective cover 39 extends vertically. The upper end of the protective member 39 is held in the gearbox 42. The lower end of the protective cover 39 is adjacent to the upper surface of the base portion 6. A saw blade 34 is disposed behind the protective component 39.

[0052] The base part 6 is disposed on the lower side of the main body part 2 and is mounted on the main body part 2. The base portion 6 has a base 110, a base plate 112, a plurality of (4) screws (not shown), a nut 114, a bolt 116 and a pressure plate 117.

[0053] The base 110 is made of die-cast aluminum alloy and is a plate that extends forward, backward, left, and right. The front of the base 110 is two-pronged. The saw blade 34 can pass between the two prongs of the base 110. The base 110 has a scale mounting portion 119. The scale mounting portion 119 is disposed at the front end of each of the two strand-shaped portions of the base 110. One scale (not shown) can be inserted into the scale mounting portion 119.

[0054] The substrate 112 is made of metal and is a plate made of steel. By placing the substrate 112 on the lower surface of the base portion 6, wear on the base portion 6 caused by contact with the workpiece is suppressed. The substrate 112 is assembled to the underside of the base 110 by four screws.

[0055] Nut 114 is held at the lower rear of gearbox 42. Nut 114 is positioned at the center of the main body 2 in the left-right direction. Furthermore, the nut 114 can be a structural element of the main body 2 or an independent structural element.

[0056] Bolt 116 extends vertically with the head as the bottom side. The pressure plate 117 is plate-shaped. The cross-section of the pressure plate 117 is arched. A bolt hole is provided in the center of the pressure plate 117. The pressure plate 117 can also be omitted. Bolt 116 passes through the bolt hole in pressure plate 117 and the cross-shaped hole in base 110, and enters nut 114. The base part 6 is fixed to the gearbox 42 by bolts 116 that enter the nut 114 and pressure plate 117.

[0057] The user can change at least one of the following as needed: the posture of the main body 2 relative to the base 6 (the tilt angle of the main body 2 to the left or right), and the relative position of the main body 2 relative to the base 6 in the front-back direction. When changing the posture of the main body 2 relative to the base 6, the user loosens bolt 116. This releases the fixation of the base 6 via pressure plate 117, allowing bolt 116 to move along the intersecting hole. By moving bolt 116 along the left-right extension of the intersecting hole, the user can change the posture of the main body 2 relative to the base 6. In other words, the tilt angle of the main body 2 relative to the base 6 can be changed. The user then tightens bolt 116 at the desired posture to complete the posture change. When changing the relative position of the main body 2 with respect to the base 6 in the front-to-back direction, the user loosens the bolt 116, moves the bolt 116 along the front-to-back extension of the cross-shaped hole, and tightens the bolt 116 at the desired position. In the case where the bolt 116 is located at the intersection of the front-to-back extending portion and the left-to-right extending portion in the cross-shaped hole, the main body 2 is in its basic position relative to the base 6. Figures 1 to 3 The image shows the wire saw 1 with the main body 2 in its basic position.

[0058] The saw blade retainer 32 will be described in further detail below. Figure 4 and Figure 5 This is an exploded perspective view of the saw blade 34, the saw blade holder 32, and the sliding body 84. Furthermore, Figure 4 and Figure 5 This is a picture before the saw blade is inserted.

[0059] The saw blade 34 has multiple (two) protrusions 34C at its upper end, which is the side end of the main body 2. Each protrusion 34C is positioned at the front and rear of the saw blade 34. The front protrusion 34C protrudes forward from the front edge of the upper end of the saw blade 34. The rear protrusion 34C protrudes rearward from the rear edge of the upper end of the saw blade 34. The upper end of the saw blade 34 is formed in a "+" shape by the protrusions 34C.

[0060] The slider body 84 has a guide portion 84G at its lower end, opposite to the main body 2. The guide portion 84G is a cylindrical metal block with grooves, slits, and holes. The guide portion 84G is fixed to the lower end of other parts of the slider body 84. Alternatively, the guide portion 84G may be integrally formed with other cylindrical parts of the slider body 84. The guide part 84G has a saw blade receiving groove 84C, a guide hole 84H, a locking guide slit 84S, a fastener mounting hole 84P, and a flange part 84F.

[0061] The saw blade receiving groove 84C is located at the center of the guide portion 84G in the left-right direction. The saw blade receiving groove 84C extends forward, backward, up, and down. The lower part of the saw blade receiving groove 84C reaches the front and rear outer surfaces of the guide portion 84G. The lower part of the saw blade receiving groove 84C forms a slit portion. The portion of the saw blade receiving groove 84C, excluding the slit portion, is a perforated portion formed by a combination of a long quadrilateral space and a semi-cylindrical space when viewed from below. The semi-cylindrical space is located on the left side of the long quadrilateral space. The inner surface on the left side of the perforated portion of the saw blade receiving groove 84C is formed into a semi-cylindrical surface.

[0062] The guide hole 84H extends in the left-right direction. The guide hole 84H is located on the right side of the saw blade receiving groove 84C and communicates with the saw blade receiving groove 84C. The engaging guide slit 84S is located on the left side of the saw blade receiving groove 84C. The engaging guide slit 84S communicates with the saw blade receiving groove 84C. The engaging guide slit 84S reaches the left outer surface of the guide portion 84G. The engaging guide slit 84S extends in the vertical direction. Fastener mounting hole 84P is circumferentially positioned between saw blade receiving groove 84C and engaging guide slit 84S. Fastener mounting hole 84P extends in an inclined direction from left front to right rear. Fastener mounting hole 84P communicates with saw blade receiving groove 84C. A flange portion 84F is disposed at the upper end of the guide portion 84G. The flange portion 84F protrudes radially outward relative to the adjacent portion. Viewed from below and above, the flange portion 84F is annular. Furthermore, for example, the engaging guide slit 84S may be an engaging guide groove that does not reach the outer surface of the guide portion 84G, and at least one of the groove, slit, and hole may be changed to other forms. Additionally, the fastener mounting hole 84P may not be connected to the saw blade receiving groove 84C.

[0063] The saw blade retainer 32 has a first pressing member 130, a sleeve 132, a first force-applying member 134, a fastener 136, a resilient retaining ring 138, a cover 140, a second pressing member 142, and a second force-applying member 144.

[0064] The first pressing component 130 is pin-shaped and has a first pressing component body 130B and a first pressing component head 130H. The first pressing component body 130B is a prism-shaped part extending to the left and can slide to the guide hole 84H. The first pressing component 130 can move in the left-right direction. The first pressing component 130 can move towards or away from the saw blade 34. The head 130H of the first pressing member is disposed on the right side of the body 130B of the first pressing member. The head 130H of the first pressing member extends upward, downward, forward, and backward from the right end of the body 130B of the first pressing member. Therefore, it is possible to prevent the entire first pressing member 130 from entering the radially inward side from the opening on the radially outer side of the guide hole 84H. The first pressing component 130 is disposed on the radial inner side of the sleeve 132. The first pressing component 130 can press the saw blade 34.

[0065] For example Figure 6 As shown, the sleeve 132 is cylindrical and cap-shaped. The sleeve 132 has a sleeve body 132B, a handle portion 132H, a resilient retaining ring mounting groove 132S, a first cam surface 132C serving as a cam surface, a saw blade passage hole 132P, multiple (two) saw blade holding portions 132L, a locking portion guide portion 132G serving as a locking portion, and a second cam surface 132D. Furthermore, Figure 6 The direction in the center is the direction when the saw blade is locked.

[0066] The sleeve body 132B has a cylindrical part extending vertically and a cap-shaped lower surface. The handle 132H is a rod-shaped part that protrudes radially outward from the left side of the sleeve body 132B. The resilient retaining ring mounting groove 132S is formed as a slit on the inner surface of the upper opening of the sleeve body 132B. The slit is located at the root of the handle portion 132H. The resilient retaining ring mounting groove 132S is recessed radially outward relative to the adjacent inner surface.

[0067] The first cam surface 132C is formed on the right side of the lower inner surface of the sleeve body 132B and on the radial outer side of the first pressing member 130. The inner diameter of the first cam surface 132C gradually decreases from the front to the rear. A first pressing member 130 is disposed radially inside the first cam surface 132C. The radially outer surface, i.e., the right surface, of the head 130H of the first pressing member contacts the first cam surface 132C. The first pressing member 130 can move along the first cam surface 132C by relative rotational movement relative to the sleeve 132.

[0068] A saw blade through-hole 132P is formed on the lower surface of the sleeve body 132B. The saw blade through-hole 132P is φ-shaped. The diameter of the circular portion of the saw blade through-hole 132P when viewed from below is the same as or slightly larger than the front-back direction (i.e., the width direction of the saw blade 34) of the upper end portion of the saw blade 34 without the protrusions 34C. The length of the long side of the elongated quadrilateral portion of the saw blade through-hole 132P when viewed from below is the same as or slightly larger than the front-back direction of the upper end portion of the saw blade 34 with the pair of protrusions 34C. Each saw blade retainer 132L is arranged front and rear. Each saw blade retainer 132L is located on the lower surface of the sleeve body 132B, adjacent to the saw blade passage hole 132P. More specifically, when viewed from below, the front saw blade retainer 132L is positioned counterclockwise relative to the front end of the elongated quadrilateral portion in the saw blade passage hole 132P, wherein the elongated quadrilateral portion extends radially outward from the circular portion in the saw blade passage hole 132P. Furthermore, when viewed from below, the rear saw blade retainer 132L is positioned counterclockwise relative to the rear end of the elongated quadrilateral portion in the saw blade passage hole 132P, wherein the elongated quadrilateral portion extends radially outward from the circular portion in the saw blade passage hole 132P.

[0069] The engaging guide portion 132G is disposed on the inner surface of the left side of the sleeve body 132B and on the left side of the first cam surface 132C. The engaging guide portion 132G is formed in a groove shape when its inner diameter is larger than that of the adjacent first cam surface 132C. The engaging guide portion 132G is disposed on the left side of the rear saw blade retaining portion 132L. The second cam surface 132D is formed on the inner surface of the left side of the lower surface of the sleeve body 132B, adjacent to the saw blade passage hole 132P and adjacent to the saw blade holding part 132L. The second cam surface 132D is disposed on the left side of the lower end of the engaging part guide part 132G. The second cam surface 132D is a cam surface whose position, i.e., its height, changes in the vertical direction. The height of the second cam surface 132D is highest on the side closest to the engaging part guide part 132G, and gradually decreases in the circumferential direction as it moves towards the left front.

[0070] The first force-applying component 134 is an elastic body, specifically a torsion spring. The first force-applying component 134 is annular, extending forward, backward, left, and right. When viewed from below upwards, the first force-applying component 134 applies force to the sleeve 132 in a counter-clockwise direction. The first force-applying component 134 applies force to the first pressing component 130 through the sleeve 132. The upper end of the first force-applying component 134 extends radially outward and is held in the handle portion 132H of the sleeve 132. The lower end of the first force-applying component 134 extends in the vertical direction and is fixed by a fastener 136. Figure 4 and Figure 5 In order to be fully and clearly illustrated in the perspective view, the first force-applying component 134 and the fastener 136 are shown in contact with each other. Fastener 136 is pin-shaped and enters the fastener mounting hole 84P of the guide portion 84G of the sliding body 84. The first force-applying member 134 is disposed on the upper side of the first pressing member 130. Alternatively, the first force-applying member 134 may be disposed on the lower side of the first pressing member 130. Accordingly, the radial dimension of the saw blade holder 32 is suppressed. The first force-applying component 134 is disposed on the radial inner side of the sleeve 132.

[0071] The elastic retaining ring 138 is disposed on the upper side of the flange portion 84F of the guide portion 84G and is held in the elastic retaining ring mounting groove 132S of the sleeve 132. The elastic retaining ring 138 prevents the sleeve 132 from falling off relative to the guide portion 84G. The cover 140 is annular and is embedded in the upper opening of the sleeve 132 to cover the upper opening. The cover 140 prevents dust from entering the sleeve 132.

[0072] The second pressing member 142 is a pin-shaped part extending in the vertical direction. The second pressing member 142 has a pressing part 142P, a tongue part 142T, and an engaging part 142F. The pressing part 142P is a cylindrical shape extending in the vertical direction and is disposed at the upper end of the second pressing member 142. The imaginary center line of the pressing part 142P extending in the vertical direction or its extension line passes through the mounted saw blade 34. The tongue 142T is plate-shaped with a cylindrical surface. The tongue 142T extends downward from the left side of the lower end of the pressing part 142P. The cylindrical surface of the tongue 142T is continuous with the cylindrical surface of the left side of the pressing part 142P. The tongue 142T is disposed radially inside the first force-applying member 134. This allows for effective utilization of the space within the saw blade holder 32. Consequently, the saw blade holder 32 becomes more compact. The second pressing member 142 penetrates the inner space of the first force-applying member 134. The tongue 142T connects the pressing part 142P to the engaging part 142F. The pressing part 142P, the tongue 142T, and the engaging part 142F are integrated. The tongue 142T, extending vertically, is offset horizontally relative to the imaginary centerline of the pressing part 142P.

[0073] The engaging portion 142F is plate-shaped and extends upwards, downwards, leftwards, and rightwards. The engaging portion 142F protrudes to the left from the left surface of the lower end of the tongue portion 142T. The pressing part 142P and the tongue part 142T move vertically into the saw blade receiving groove 84C of the guide part 84G. The left surface of the pressing part 142P and the left surface of the tongue part 142T are formed as continuous semi-cylindrical surfaces, contacting the inner surface of the semi-cylindrical shape on the left side of the saw blade receiving groove 84C. The movement of the pressing part 142P and the tongue part 142T is guided by the saw blade receiving groove 84C. The engaging part 142F moves vertically into the engaging part guide slit 84S of the guide part 84G. The vertical movement of the engaging part 142F is guided by the engaging part guide slit 84S. The engaging part 142F moves vertically into the engaging part guide part 132G of the sleeve 132. Part of the vertical movement of the engaging part 142F is guided by the engaging part guide part 132G. The second pressing component 142 can press the saw blade 34.

[0074] The second force-applying component 144 is an elastic body, specifically a compression spring. The second force-applying component 144 extends in the vertical direction. The second force-applying component 144 applies downward force to the second pressing component 142. The second force-applying component 144 is disposed on the upper side of the second pressing component 142. The second force-applying component 144 enters the upper end of the saw blade receiving groove 84C.

[0075] The saw blade retainer 32 is assembled to the guide portion 84G of the sliding body 84 as follows. Furthermore, for ease of understanding, the description is based on the orientation shown in the accompanying drawings; however, in actual assembly operations, various component orientations different from those described below may be used. That is, the second force-applying component 144 and the second pressing component 142 enter the saw blade receiving groove 84C. The elastic retaining ring 138 is disposed on the upper side of the flange portion 84F. The first pressing component 130 enters the guide hole 84H. The fastener 136 enters the fastener mounting hole 84P in a state where it does not extend radially outward. Then, with the upper end of the first force-applying member 134 installed in the handle portion 132H of the sleeve 132, the sleeve 132 moves radially outward from below the guide portion 84G. The elastic retaining ring 138 enters the elastic retaining ring mounting groove 132S. The engaging portion 142F of the second pressing member 142 enters the engaging portion guide portion 132G of the sleeve 132. Afterward, the radially outward end of the fastener 136 moves radially outward from the fastener mounting hole 84P and hooks the lower end of the second force-applying member 144. Finally, the cover 140 is inserted into the upper opening of the sleeve 132.

[0076] The saw blade retainer 32 can be installed automatically without tools and with one click simply by placing the saw blade 34 between the first pressing member 130 and the second pressing member 142. The installation of the saw blade 34 will now be described in the following order: before insertion, during insertion, when the saw blade 34 is pressed in, and when the saw blade 34 is locked. These four states are distinguished for ease of explanation; in reality, the installation of the saw blade 34 is performed through a series of actions over a short period of time.

[0077] Figure 7A This is a bottom view of the saw blade holder 32 before the saw blade 34 is inserted. Figure 7B This is a bottom view of the saw blade retainer 32 when the saw blade 34 is locked. Figure 8A This is a cross-sectional view (AA) of the saw blade retainer 32 before and during saw blade insertion. Figure 8B yes Figure 8A CC section view. Figure 9A This is a cross-sectional view (AA) of the saw blade retainer 32 when the saw blade 34 is pressed in. Figure 9B yes Figure 9A DD sectional view. Figure 10A This is a cross-sectional view (AA) of the saw blade retainer 32 when the saw blade 34 is locked. Figure 10B yes Figure 10A EE sectional view. Figure 11A yes Figure 8B FF sectional view. Figure 11B yes Figure 9B GG cross-sectional view. Figure 11C yes Figure 10B HH cross-sectional view.

[0078] Before the saw blade 34 is inserted, the saw blade of the sleeve 132 is oriented in the front-to-back direction through the elongated quadrilateral portion of the hole 132P. The handle 132H is located slightly to the left of the front. Figure 7A , Figure 8B The position of (1 o'clock in the middle). When viewed from below ( Figure 8B The first force-applying component 134 applies force to the sleeve 132 in a clockwise direction. The second force-applying component 144 is in its natural length state or a state close to its natural length state. Furthermore, the engaging portion 142F of the second pressing member 142 enters the engaging portion guide portion 132G. Therefore, clockwise rotation of the sleeve 132, which is subjected to force by the first force-applying member 134, is suppressed. That is, the sleeve 132 is prevented from rotating. The lower edge of the engaging portion 142F contacts the inner surface of the lower surface portion of the sleeve 132. Therefore, the second pressing member 142 is prevented from falling off. The engaging portion 142F enters and engages with the engaging portion guide 132G, thereby preventing the sleeve 132 from rotating. This maintains the compactness of the saw blade retainer 32 and stops the sleeve 132 from rotating. The first pressing member 130 is located radially inside the large-diameter portion of the first cam surface 132C. The body 130B of the first pressing member can be easily moved to the right, thereby easily retracting from the saw blade receiving groove 84C.

[0079] From this state, when the saw blade retainer 32 is inserted into the end of each protrusion 34C side of the saw blade 34, firstly, the end of the saw blade 34 passes through the elongated quadrilateral portion of the saw blade through hole 132P. Accordingly, the posture of the saw blade 34 is guided into an installation posture that extends back and forth and up and down. Next, the end of the saw blade 34 passes between the first pressing member 130 and the second pressing member 142. Then, the end of the saw blade 34 contacts the lower surface of the pressing portion 142P of the second pressing member 142. Figure 8A , Figure 8B , Figure 11A (The double-dotted line). The tool opener 35 is not required when inserting the saw blade 34 above or when pressing in the next saw blade 34. The tool opener 35 is only used when removing the saw blade 34.

[0080] When the saw blade 34 moves further upward, the saw blade 34 becomes pressed into the second pressing member 142. At this time, the pressing part 142P is pressed up by the end of the saw blade 34, overcoming the force of the second force-applying member 144. The left surface of the pressing part 142P and the left surface of the tongue 142T are guided by the left surface of the saw blade receiving groove 84C. The engaging part 142F is guided by the engaging part guide slit 84S and the engaging part guide part 132G. Each protrusion 34C of the saw blade 34 is guided by the slit portion of the corresponding saw blade receiving groove 84C.

[0081] Then, the lower edge of the engaging portion 142F is positioned above the upper edge of the engaging portion guide 132G of the sleeve 132, thereby disengaging the engaging portion 142F from the engaging portion guide 132G, and releasing the engagement of the engaging portion 142F relative to the engaging portion guide 132G. Thus, when viewed from below, the sleeve 132 automatically rotates clockwise under the force of the first force-applying member 134.

[0082] The rotation of the sleeve 132 stops when the first pressing member 130 reaches a predetermined state. Specifically, the rotation of the sleeve 132 stops when the head 130H of the first pressing member contacts the first cam surface 132C of the sleeve 132 and the left surface of the body 130B of the first pressing member presses against the right surface of the saw blade 34. The first pressing member 130 moves to the left along the first cam surface 132C during the rotation of the sleeve 132. After the sleeve 132 rotates, the first pressing member 130 is subjected to force by the first force-applying member 134 through the sleeve 132. Specifically, the clockwise force applied to the first pressing member 130 when viewed from below is converted to a force applied to the left side of the first pressing member 130 through the first cam surface 132C. When the saw blade 34 is not in use, the first force-applying member 134 rotates the force-applying arm 50° from its free angle to a compressed state. When the saw blade 34 is inserted, the first force-applying member 134 rotates the force-applying arm 60° from its free angle to a compressed state. By pressing upwards with the second pressing member 142, the first pressing member 130 automatically presses down on the saw blade 34. Furthermore, the angle of the first force-applying member 134 relative to the free angle in each state can be appropriately changed according to the above values.

[0083] At this time, when viewed from below upwards, the long quadrilateral portion of the saw blade through the hole 132P is inclined in a direction from right rear to left front. Each protrusion 34C of the saw blade 34 is located on the upper side of the lower surface of the sleeve body 132B. The lower edge of each protrusion 34C contacts the corresponding saw blade holding portion 132L. Each protrusion 34C is forceped towards the corresponding saw blade holding portion 132L by the second force-applying member 144. The upper edge of each protrusion 34C moves away from the upper end of the slit portion of the corresponding saw blade receiving groove 84C. The handle portion 132H is located on the left side (…). Figure 7B , Figure 10B (The center is at the 3 o'clock position).

[0084] The saw blade retainer 32 is locked into the saw blade 34 state by rotating the sleeve 132. When saw blade 34 is locked, such as Figure 10B As shown, the saw blade 34 is held by the first pressing member 130 and the left inner surface of the saw blade receiving groove 84C. The central portion of the right surface of the saw blade 34 in the front-rear direction contacts the left end face of the first pressing member 130. The front and rear portions of the left surface of the saw blade 34 contact the left inner surface of the saw blade receiving groove 84C. Each protrusion 34C of the saw blade 34 is held in the corresponding saw blade holding portion 132L in the sleeve 132. Therefore, the saw blade 34 is prevented from falling off. The imaginary center line of the saw blade 34, which is mounted on the saw blade holder 32, in its extending direction (i.e., vertical direction), is offset towards the first pressing member 130 in a direction orthogonal to the direction of reciprocating motion (i.e., left-right direction). The saw blade 34 is offset to the right relative to the center of the saw blade holder 32. Therefore, the saw blade holder 32 can accommodate various thicknesses in the saw blade 34.

[0085] The saw blade 34 is disassembled in the following manner. When the power to the wire saw 1 is off, and the left side of the tool opener 35 is pushed forward, the left rear part of the tool opener 35 causes the handle 132H of the sleeve 132 to move against the force of the first force-applying component 134. Therefore, when viewed from below, sleeve 132 rotates counterclockwise, from... Figure 7B The state becomes Figure 7A During the rotation of the sleeve 132, the engaging portion 142F of the second pressing member 142 moves relative to the second cam surface 132D by the downward force of the second force-applying member 144. Furthermore, at the end of the rotation of the sleeve 132, the engaging portion 142F enters the engaging portion guide portion 132G from the end of the second cam surface 132D, stopping the rotation of the sleeve 132.

[0086] At this time, the large-diameter portion of the first cam surface 132C is located to the right of the first pressing member 130. Furthermore, the first pressing member 130 is not subjected to the force of the first force-applying member 134 and can move freely to the right, opposite to the saw blade 34. The saw blade passes through the elongated quadrilateral portion of the hole 132P, changing from an inclined direction to a front-rear direction, and is located in a rotational position where each protrusion 34C of the saw blade 34 can pass. Each protrusion 34C disengages from its corresponding saw blade holding portion 132L due to the rotation of the sleeve 132. Therefore, the saw blade 34 is pushed downwards via the second pressing member 142 by the force of the second force-applying member 144.

[0087] In the saw blade holder 32, the first force-applying member 134 is offset from the first pressing member 130 in the vertical direction and is positioned above the first pressing member 130. More specifically, even if the movable first force-applying member 134 is positioned in any location, it does not overlap with the first pressing member 130 when viewed from a direction orthogonal to the extending direction of the sliding member body 84 (the radial direction of the sleeve 132). In other words, even if the movable first force-applying member 134 is positioned in any location, it does not overlap with the first pressing member 130 when viewed from the direction of movement of the first pressing member 130 (i.e., the left-right direction). That is, the first force-applying member 134 is positioned away from the direction of movement of the first pressing member 130.

[0088] Therefore, in the wire saw 1, the dimensions of the first force-applying member 134 in at least one of the front-back and left-right directions can be suppressed, that is, the front-back and left-right dimensions of the first force-applying member 134 are suppressed, making its dimensions optimal. Furthermore, the front-back and left-right dimensions of the saw blade holder 32 are suppressed, achieving a smaller diameter for the saw blade holder 32. Therefore, the visual clarity of the portion adjacent to the saw blade 34 is further improved, and the workability of the wire saw 1 for processing, etc., is improved. Furthermore, in the wire saw 1, through the force applied by the first force-applying member 134 and the second force-applying member 144, the user can easily install the saw blade 34 simply by inserting it into the saw blade retainer 32, without needing to operate the saw blade opener 35. Additionally, the user can easily remove the installed saw blade 34 simply by operating the tool opener 35 to advance the handle 132H.

[0089] In the saw blade holder 32, the saw blade 34 is mainly held by the clamping of the first pressing member 130 and the second pressing member 142, and the upper edge of each protrusion 34C leaves the upper end of the slit portion of the saw blade receiving groove 84C. This suppresses wear on the upper and lower edges of each protrusion 34C. Consequently, it suppresses changes in the installation angle of the saw blade 34, preventing situations that could negatively impact workability.

[0090] An example of the operation of this wire saw 1 will be explained. The user installs the saw blade 34 onto the saw blade holder 32. The upper end of the saw blade 34 passes through the saw blade holder 32, and the saw blade 34 can be installed by simply pressing it in slightly. The user installs the charged battery 8 into the battery mounting section 18.

[0091] When the user operates the on / off switch 26 within a specified time after operating the locking switch 27, the controller 20 supplies electrical power from the battery 8 to the electric motor 12 under control, causing the motor shaft 53 to rotate at a controlled speed. The electric motor 12 is driven at a speed corresponding to the rotational position of the speed adjustment switch 22. In addition, the rotation direction of the motor shaft 53 can also be set to be switchable.

[0092] The fan 14 rotates due to the rotation of the motor shaft 53, creating an airflow (i.e., wind) within the main body 2. This airflow flows from the gap between the air inlet 44 and the housing 10 to the radially outer side of the fan 14. Accordingly, the internal mechanism of the wire saw 1, including the electric motor 12 and the controller 20, is cooled.

[0093] The rotational force of the motor shaft 53 is converted into reciprocating motion through the reduction gear at the intermediate gear 65 and transmitted to the sliding member 29, the saw blade holder 32 and the saw blade 34. The vibration of the wire saw 1 is suppressed by the counterweight 38. Users can switch the track movement mode of the saw blade 34 by operating the knob 37K as needed. The user can adjust the reciprocating speed of the saw blade 34 by using the speed adjustment switch 22 as needed.

[0094] The user brings the workpiece-operating part of the reciprocating saw blade 34 into contact with the workpiece-operated part, causing the saw blade 34 to move relative to the workpiece. Thus, the workpiece-operated part is cut by the saw blade 34.

[0095] When processing is complete, the user operates the on / off switch 26 to disconnect the electric motor 12. At this time, the saw blade 34 stops. The user then removes the battery 8 and the saw blade 34 as appropriate. The saw blade can be disassembled without tools and with a single click by operating the tool opener 35.

[0096] Furthermore, the above methods and their variations are not limited to the above methods; for example, the following changes may also be implemented appropriately. In the wire saw 1, even if the second pressing member 142 is pressed in by the saw blade 34, the first pressing member 130 may not automatically press the saw blade 34. For example, the user can install the saw blade 34 by operating the tool opener 35 while keeping it forward.

[0097] The reduction mechanism from the motor shaft 53 to the saw blade 34 in the wire saw 1 can also be replaced by a reduction mechanism other than the pinion 54 and the intermediate gear 65. The reciprocating motion conversion mechanism in the wire saw 1 that converts the rotational driving force from the motor shaft 53 to the saw blade 34 into reciprocating motion can also be replaced by a motion conversion mechanism other than the motion conversion mechanism composed of the guide roller 69 and the roller guide 80. The wire saw 1 can also replace the battery mounting section 18 and have a power cord for AC drive using commercial power. At least one of the materials used in the various boxes and housings can be changed to resin, metal, or composite materials of these materials. The division of the housing 10 can also be modified accordingly. Furthermore, at least one of the following can be appropriately changed: the number, presence, material, configuration, structure, and form of various components and parts. Furthermore, the above method or its variations can also be applied to wire saws with a top tool other than the saw blade 34. In addition, the above methods or their variations can also be applied to reciprocating motion cutting tools other than wire saws, such as reciprocating saws.

Claims

1. A reciprocating motion cutting tool (1), characterized in that, It has a saw blade assembly / disassembly section (32), which is reciprocating and allows for the assembly / disassembly of the saw blade (34). The saw blade assembly / disassembly unit (32) includes a first pressing component (130), a first force-applying component (134), a second pressing component (142), and a second force-applying component (144), wherein, The first pressing component (130) can move in a direction approaching or away from the saw blade (34) and can press the saw blade (34); The first force-applying component (134) applies force to the first pressing component (130); The second pressing component (142) can press the saw blade (34) in a direction different from the pressing direction of the first pressing component (130); The second force-applying component (144) applies force to the second pressing component (142). When the second pressing component (142) is pressed in by the saw blade (34), the first pressing component (130) automatically presses the saw blade (34). The first force-applying component (134) is positioned to avoid the direction of movement of the first pressing component (130).

2. The reciprocating cutting tool (1) according to claim 1, characterized in that, The second pressing component (142) can move along the reciprocating direction of the saw blade disassembly and assembly part (32). The first pressing member (130) moves in a direction orthogonal to the moving direction of the second pressing member (142). The first force-applying component (134) is positioned offset from the first pressing component (130) in the direction of the reciprocating motion of the saw blade assembly / disassembly part (32).

3. The reciprocating cutting tool (1) according to claim 1 or 2, characterized in that, The first force-applying component (134) is a torsion spring. The second pressing member (142) is disposed radially inside the first force-applying member (134).

4. The reciprocating cutting tool (1) according to any one of claims 1 to 3, characterized in that, The saw blade assembly / disassembly section (32) has a sleeve (132) that can rotate about the direction of reciprocating motion of the saw blade assembly / disassembly section (32). The first pressing component (130) and the first force-applying component (134) are disposed on the radial inner side of the sleeve (132).

5. The reciprocating cutting tool (1) according to claim 4, characterized in that, The sleeve (132) has a cam surface (132C) on its inner surface. The first pressing member (130) moves along the cam surface (132C) as the sleeve (132) rotates.

6. The reciprocating cutting tool (1) according to claim 4 or 5, characterized in that, The second pressing component (142) extends along the reciprocating direction of the saw blade disassembly and assembly part (32). The second pressing component (142) has an engaging portion (142F). The sleeve (132) has a locking portion (132G), The engaging portion (142F) prevents the sleeve (132) from rotating by engaging with the engaged portion (132G).

7. The reciprocating cutting tool (1) according to claim 6, characterized in that, When the engaging part (142F) engages with the engaged part (132G), the sleeve (132) allows the first pressing member (130) to move to a position where the saw blade (34) is not pressed. When the engagement between the engaging part (142F) and the engaged part (132G) is released, the sleeve (132) moves the first pressing member (130) to the position of pressing the saw blade (34).

8. The reciprocating cutting tool (1) according to claim 6 or 7, characterized in that, The second pressing member (142) has a pressing part (142P) and a tongue (142T), wherein the tongue (142T) connects the engaging part (142F) and the pressing part (142P) into one unit. When the pressing part (142P) is pressed by the saw blade (34), the engaging part (142F) moves and disengages from the engaged part (132G).

9. The reciprocating cutting tool (1) according to claim 8, characterized in that, The tongue (142T) and the pressing part (142P) extend in the direction of reciprocating motion of the saw blade assembly / disassembly part (32). The tongue (142T) deviates from the imaginary center line of the pressing part (142P) in a direction orthogonal to the reciprocating motion of the saw blade assembly / disassembly part (32).

10. A reciprocating motion cutting tool (1), characterized in that, It has a saw blade assembly / disassembly section (32), which is reciprocating and allows for the assembly / disassembly of the saw blade (34). The saw blade assembly / disassembly unit (32) includes a sleeve (132), a first pressing component (130), a first force-applying component (134), a second pressing component (142), and a second force-applying component (144), wherein, The sleeve (132) can rotate about the direction of reciprocating motion of the saw blade disassembly and assembly part (32), and has a locking part (132G); The first pressing member (130) is disposed on the radial inner side of the sleeve (132) and moves with the rotation of the sleeve (132). The first pressing member (130) can move in a direction close to or away from the saw blade (34) and can press the saw blade (34). The first force-applying component (134) is disposed on the radially inner side of the sleeve (132) and applies force to the first pressing component (130); The second pressing component (142) can press the saw blade (34) in the direction of reciprocating motion of the saw blade disassembly and assembly part (32); The second pressing component (142) has an engaging portion (142F), a pressing portion (142P), and a tongue portion (142T), wherein, The engaging part (142F) prevents the sleeve (132) from rotating by engaging with the engaged part (132G); The pressing part (142P) extends along the reciprocating motion direction of the saw blade assembly / disassembly part (32); The tongue (142T) connects the engaging part (142F) and the pressing part (142P) into one unit, and extends along the reciprocating direction of the saw blade disassembly and assembly part (32). The tongue (142T) deviates from the imaginary center line of the pressing part (142P) in a direction orthogonal to the reciprocating direction of the saw blade disassembly and assembly part (32). The second force-applying component (144) applies force to the second pressing component (142). When the pressing part (142P) is pressed by the saw blade (34), the engaging part (142F) moves and disengages from the engaged part (132G).

11. The reciprocating cutting tool (1) according to any one of claims 1 to 10, characterized in that, The imaginary center line of the saw blade (34) mounted on the saw blade assembly (32) in the extension direction deviates from the imaginary center line in the extension direction of the saw blade assembly (32) towards the first pressing member (130) in a direction orthogonal to the direction of reciprocating motion of the saw blade assembly (32).

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