RECIRCULATED CUTTING TOOL

Abstract

A reciprocating cutting tool (1) has a cutting blade holder (32) to which a cutting blade (34) can be removably attached. The cutting blade holder (32) is reciprocating. The cutting blade holder (32) has a first pressing element (130) that is movable towards or away from the cutting blade (34) to press the cutting blade (34), a first preloading element (134) that preloads the first pressing element (130), a second pressing element (142) that can press the cutting blade (34) in a direction different from the direction in which the first pressing element (130) presses the cutting blade (34), and a second preloading element (144) that preloads the second pressing element (142). The first pressing component (130) automatically presses the cutting blade (34) when the second pressing component (142) is pressed through the cutting blade (34).The first prestressing component (134) is positioned in such a way as to avoid being in a direction of movement of the first pressing component (130).

Description

BACKGROUND 1. Technical field

[0001] The present disclosure relates to a reciprocating cutting tool, such as a jigsaw or a saber saw. 2. State of the art

[0002] A known jigsaw is disclosed in JP 2002 - 254 403 A (Patent Literature 1).

[0003] A jigsaw 10 described in patent literature 1 has a clamp 26 for a cutting blade 22. The clamp 26 has a sleeve 33 that rotates between an unlocked and a locked position to change the cutting blade 22. The sleeve 33 is biased in one direction of rotation by a helical spring 44. In the locked position, the clamp 26 holds the cutting blade 22 between a pin 42, which is pressed by a cam 33c in the sleeve 33, and a wall surface 37j of a slot 37a on a rod 37. The helical spring 44 is located radially outside the pin 42, which presses the cutting blade 22.

[0004] To attach or remove the cutting blade 22, the user handles the cutting blade 22 while maintaining the unlocked state by holding the sleeve 33 in a rotational position by means of a continuous opening process on an actuable component 52.

[0005] A known cutting blade holder device for a jigsaw is disclosed in JP 2011 - 255 449 A (Patent Literature 2).

[0006] A cutting blade holder device 10 described in patent literature 2 comprises a rod 11, a cutting blade guide 12, a guide engagement component 20, a cutting blade holder 13, an actuating component 14, and a torsion spring 18. The cutting blade guide 12 is cylindrical and is held at the lower end of the rod 11 by a cylindrical guide bearing 15 located between the cutting blade guide 12 and the lower end of the rod 11. The guide engagement component 20 is located below the guide bearing 15. The cutting blade holder 13 and the actuating component 14 are each cylindrical. The cutting blade holder 13 and the actuating component 14 are connected to each other, with the guide bearing 15 and the guide engagement component 20 being received radially on the inside of the cutting blade holder 13 and the actuating component 14, respectively. The torsion spring 18 is located between the actuated component 14 and the guide engagement component 20.The torsion spring 18 pre-tensions the actuable component 14 in a cutting blade holder position in the direction of rotation.

[0007] The cutting blade guide 12 is received in an inner hole of the rod 11 in a manner that allows movement in the axial direction. The cutting blade guide 12 is pressed deep into the interior in response to a pressure exerted by a cutting blade B, which is received in a guide groove 12c on the cutting blade guide 12. A pair of rotary locking edges 12a of the cutting blade guide 12 is then pulled out of corresponding engagement grooves 13f of the cutting blade holder 13. The actuated component 14 then automatically rotates toward the cutting blade holder position under a preload force from the torsion spring 18. The cutting blade B has a pair of engagement ears Bb. Each engagement ear Bb is held vertically between a corresponding stop groove 20a on the guide engagement component 20 and a corresponding cam 13e on the cutting blade holder 13, which has rotated toward the cutting blade holder position. BRIEF SUMMARY

[0008] In the clamp 26 of patent literature 1, the helical spring 44 is located radially outside the pin 42, which presses the cutting blade 22. Clamp 26 thus has a larger diameter. Due to this larger diameter, the user has less visibility of the area around the cutting blade 22 during operation. Furthermore, the user must maintain the opening mechanism on the actuating component 52 when inserting and removing the cutting blade 22 from clamp 26. This is cumbersome.

[0009] In the cutting blade holder device 10 of patent literature 2, the engagement ears Bb are held vertically in the cutting blade B. The engagement ears Bb are therefore subject to slight wear. This changes the angle at which the cutting blade B is mounted, thereby impairing its handling.

[0010] One or more aspects of the present disclosure relate to a reciprocating cutting tool that allows for easy attachment and removal of a cutting blade.

[0011] One aspect of the revelation envisions a reciprocal cutting tool, with a cutting blade holder to which a cutting blade can be removably attached, in which the cutting blade holder is movable back and forth and the cutting blade holder a first pressing component that can be moved towards or away from the cutting blade to press the cutting blade, a first prestressing component configured to prestress the first pressing component, a second pressing component configured to press the cutting blade in a direction different from the direction in which the first pressing component presses the cutting blade, and a second prestressing component configured to prestress the second pressing component, where the first pressing component automatically presses the cutting blade when the second pressing component is pressed through the cutting blade, and The first prestressing component is positioned in such a way as to avoid being in the same direction of movement as the first pressing component.

[0012] A second aspect of the revelation provides for a reciprocal cutting tool, with a cutting blade holder to which a cutting blade can be removably attached, in which the cutting blade holder is movable back and forth and the cutting blade holder a sleeve that is rotatable about a direction in which the cutting blade holder can be moved back and forth, and the sleeve has a receiving area, a first pressing element located radially inwards from the sleeve and movable in response to a rotation of the sleeve, wherein the first pressing element is movable towards or away from the cutting blade to press the cutting blade, a first preloading component located inwards from the sleeve, in which the first preloading component is configured to preload the first pressing component, a second pressing component configured to press the cutting blade in the direction in which the cutting blade holder can be moved back and forth, in which the second pressing component an engagement area that can engage with the receiving area to stop a rotation of the sleeve, a pressure area that extends in the direction in which the cutting blade holder can be moved back and forth, and a tongue which integrally connects the engagement area and the pressing area and extends in the direction in which the cutting blade holder is movable back and forth, wherein the tongue is offset from an imaginary center line of the pressing area in a direction perpendicular to the direction in which the cutting blade holder is movable back and forth, and a second preloading component configured to press the second pressing component, where, when the pressure area is pressed through the cutting blade, the engagement area moves out of the receiving area.

[0013] The reciprocating cutting tool, according to the aspects of the disclosure described above, allows for easy attachment and removal of the cutting blade. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a perspective view of a jigsaw according to one embodiment and shows its front surface, top surface and left surface. Fig. 2 is a longitudinal mid-section view of the jigsaw in Fig. 1. Fig. 3 is a cross-sectional view along a line AA in Fig. 2. Fig. Figure 4 is a perspective exploded view of a cutting blade, a cutting blade holder and a sliding piece body in the jigsaw according to the embodiment and shows their upper surfaces, front surfaces and left surfaces. Fig. Figure 5 is a perspective exploded view of the cutting blade, the cutting blade holder and the sliding piece body of the jigsaw according to the embodiment and shows their lower surfaces, rear surfaces and right surfaces. Fig. Figure 6 is a perspective view of a sleeve at the cutting blade holder in the embodiment and shows a rear half of the sleeve when the cutting blade is locked. Fig. 7A is a bottom view of the cutting blade holder before the cutting blade is inserted. Fig. 7B is a bottom view of the cutting blade holder with the cutting blade locked in place. Fig. Figure 8A is a cross-sectional view of the cutting blade holder along line AA before and during the insertion of the cutting blade. Fig. 8B is a cross-sectional view along a line CC in Fig. 8A. Fig. 9A is a cross-sectional view of the cutting blade holder along line AA during the pressing of the cutting blade. Fig. 9B is a cross-sectional view along a line DD in Fig. 9A. Fig. 10A is a cross-sectional view of the cutting blade holder along line AA when the cutting blade is locked. Fig. 10B is a cross-sectional view along a line EE in Fig. 10A. Fig. 11A is a cross-sectional view along a line FF in Fig. 8B. Fig. 11B is a cross-sectional view along a line GG in Fig. 9B. Fig. 11C is a cross-sectional view along the HH line in Fig. 10B. DETAILED DESCRIPTION

[0014] Embodiments of the disclosure are now described with reference to the drawings, where appropriate. Modifications of the embodiments described below are also described. The disclosure is not limited to the embodiments and modifications.

[0015] The directional terms, such as front, back, top, bottom, right and left, in the embodiments and modifications are defined for the sake of simplicity and may be changed, e.g., based at least on the actuation situations or the movement of a component.

[0016] Fig. Figure 1 is a perspective view of a jigsaw 1 as an example of a reciprocating cutting tool according to one embodiment and shows its front surface, top surface and left surface. Fig. Figure 2 is a longitudinal central cross-sectional view of the jigsaw 1. Fig. Figure 3 is a cross-sectional view of line AA in Fig. 2.

[0017] The jigsaw 1 has a body 2, a base unit 6, and a rechargeable battery 8. The jigsaw 1 is powered by the rechargeable battery 8. The battery 8 is for power tools. The battery 8 can be a component of the body 2. The battery 8 can be independent of the jigsaw 1. The battery 8 can be a primary battery. The battery 8 can be any battery, such as a general-purpose battery, other than the power tool battery. The battery 8 can be connected to a power cord that can be connected to a power source. A jigsaw with a power cord that can be connected to an alternating current (AC) power source is an AC-powered jigsaw.

[0018] In Fig. 2 is the front of the jigsaw 1 on the right side, and an upper area of ​​the jigsaw 1 is at the top. Fig. Figures 1 to 3 show the jigsaw 1 with a locked cutting blade.

[0019] Body 2 is essentially L-shaped when viewed from left to right. Body 2 has an anterior body region 2F at its front. The anterior body region 2F extends vertically. Body 2 has a posterior body region 2B at its rear. The posterior body region 2B extends backward from the lower rear of the anterior body region 2F. The posterior body region 2B is cylindrical.

[0020] The body 2 comprises a housing 10, an electric motor 12, a fan wheel 14, a rear bearing 15, a front bearing 16, a battery mounting part 18, a control 20, a speed adjustment switch 22, a body connector 24, a switching unit 25, several (two) on / off switches 26, several (two) interlock switches 27, a power transmission device 28, a sliding piece 29 as an output unit, a sliding piece guide 30, a dust seal 31, a cutting blade holder 32 as a cutting blade support, a cutting blade 34 as a tip tool (tool accessory), a tool opener 35, an orbital unit 36, an orbital switch 37, a counterweight unit 38, and a guard 39.

[0021] The body 2 mainly comprises in its interior the battery mounting part 18, the control unit 20, the body connector 24, the rear bearing 15, the electric motor 12, the fan wheel 14, the front bearing 16, the power transmission device 28, the orbital unit 36, the counterweight unit 38, the sliding piece 29, the cutting blade holder 32, the switching unit 25, the guard 39 and the tool opener 35, essentially in the order mentioned from the rear.

[0022] The arrangement of various components and areas can be modified in several ways. The cutting blade 34 can be independent of the body 2 or the jigsaw 1, instead of being a component of the body 2 or the jigsaw 1. The sliding block 29 can be a component of the power transmission device 28, and the cutting blade holder 32 can serve as the dispensing unit. The sliding block 29 and the cutting blade holder 32 can together serve as the dispensing unit. A handle can be provided such that it forms a loop with the body 2.

[0023] The housing 10 defines an outer wall of the body 2.

[0024] The housing 10 holds the components directly or indirectly.

[0025] The housing 10 has a main housing 40 and a gearbox housing 42.

[0026] The main housing 40 is made of plastic. The main housing 40 is divided into a left main housing 40L and a right main housing 40R.

[0027] The left main housing 40L has several screw bosses 40B. The right main housing 40R has several threaded hole areas. The threaded hole areas have threaded holes corresponding to the screw bosses 40B. The left main housing 40L and the right main housing 40R are connected to each other by means of screws 43, which are placed in the threaded hole areas and the screw bosses 40B.

[0028] The main housing 40 is L-shaped when viewed from right to left. The main housing 40 has an upper section that is accessible to a user. The main housing 40 has a lower rear section with a lower rear opening. The main housing 40 has a lower front section with a lower front opening.

[0029] The main housing 40 has several inlets 44 and several outlets 47.

[0030] The inlets 44 are elongated in the front-to-back direction. Some of the inlets 44 are arranged vertically in a central area of ​​the left main housing 40L in the front-to-back direction. The other inlets 44 are arranged vertically in an area of ​​the right main housing 40R in the front-to-back direction.

[0031] The outlets 47 are elongated in the front-to-back direction. Some of the outlets 47 are located in an upper region of the left main housing 40L. The other outlets 47 are located in an upper region of the right main housing 40R.

[0032] Air drawn in through the inlets 44 under negative pressure, generated by the rotating fan 14, cools the electric motor 12. Most of the air that has cooled the electric motor 12 is discharged as blown air into a space defined by a branched section of a base 110. The remaining air that has cooled the electric motor 12 is discharged through the outlets 47.

[0033] The gearbox housing 42 is made of an aluminum die-cast alloy. The gearbox housing 42 is bell-shaped and has a lower opening at its bottom end. The gearbox housing 42 is divided into a front gearbox housing 42F and a rear gearbox housing 42B.

[0034] The front gearbox housing 42F has threaded hole areas in its upper, lower right, and upper left regions. The rear gearbox housing 42B has screw bosses that correspond to the threaded hole areas. The front gearbox housing 42F and the rear gearbox housing 42B are connected to each other by screws located in the threaded hole areas and screw bosses.

[0035] The gearbox housing 42 is held by the main housing 40. The gearbox housing 42 directly or indirectly holds the power transmission device 28, the orbital unit 36, the counterweight unit 38, the sliding block 29, and the cutting blade holder 32. The gearbox housing 42 has a lower rear section that projects downward through the lower front opening of the main housing 40.

[0036] The gearbox housing 42 has a rear surface which has a top hole, a top opening and a middle opening.

[0037] The housing 10 can be modified in various ways. For example, an outer wall of the front body region 2F and an outer wall of the rear body region 2B of the main housing 40 can be separate and connected to each other. The left main housing 40L and the right main housing 40R of the split main housing 40 can differ significantly from each other in at least one aspect of size or shape. The left main housing 40L and the right main housing 40R can be connected to each other by means other than screws, using, for example, an engagement area such as a tab and a receiving area such as a tab hole. The transmission housing 42 may or may not be divided into the front and rear transmission housings and may be a single unit. The main housing 40 and the transmission housing 42 can be integral to each other.At least one of the materials of the components of the housing 10 or the number and arrangement of the openings in the housing 10 may be modified. At least one of the number or arrangement of the engagement areas of the outlets 47 may be modified, if appropriate.

[0038] The electric motor 12 is a brushless direct current (DC) motor. The electric motor 12 is held in the main housing 40. The main housing 40 can serve as a motor housing for holding the electric motor 12.

[0039] The electric motor 12 has a stator 51 and a rotor 52.

[0040] The stator 51 is cylindrical. The stator 51 is held in the main housing 40 with its imaginary central axis extending in the front-back direction.

[0041] The rotor 52 has a motor shaft 53 extending in the front-back direction. The rotor 52 is cylindrical and has a center through which the motor shaft 53 extends. The rotor 52 is located radially inside the stator 51.

[0042] The rotor 52 rotates around the motor shaft 53.

[0043] The motor shaft 53 receives a drive pinion 54 at one front end.

[0044] The fan wheel 14 is integrally fixed to the motor shaft 53.

[0045] The fan wheel 14 is a centrifugal fan wheel. The fan wheel 14 could be any other fan wheel, such as an axial flow fan wheel.

[0046] The main housing 40 has a lower opening, the rear of which is located radially outside the fan wheel 14.

[0047] The rear bearing 15 is a ball bearing. The rear bearing 15 supports the motor shaft 53 in a rotatable manner. The rear bearing 15 is located between the electric motor 12 and the control unit 20. The rear bearing 15 has an outer ring that is held by the main housing 40.

[0048] The front bearing 16 is a ball bearing. The front bearing 16 supports the motor shaft 53 in a rotatable manner. The front bearing 16 is located between the fan wheel 14 and the drive pinion 54. The front bearing 16 is located at the front of the fan wheel 14. The front bearing 16 has an outer race that is held in the central opening in the gearbox housing 42.

[0049] At least one of the rear bearing 15 and the front bearing 16 can be a different type of bearing. For example, the rear bearing 15 can be a needle bearing. Other bearings can likewise be of any type.

[0050] The battery mounting part 18 is located at the rear end of the body 2.

[0051] The battery 8 can be attached to the battery mounting part 18. The battery mounting part 18 has a body connector that can be connected to a terminal on the battery 8. The body connector is located in the lower rear opening of the main housing 40.

[0052] The battery 8 is attached to a lower portion of the battery mounting part 18. With the terminal on the battery 8 facing upwards, the battery 8 is slid forwards from the rear of the battery mounting part 18 to be attached. The sliding direction of the battery 8 for attachment can be a different direction than from the rear to the front. The battery 8 can be attached in a manner other than sliding.

[0053] Battery 8 is a 36 V (volt) lithium-ion battery. Battery 8 has eight cells (not shown) in a plastic battery casing. The cells are axially elongated cylinders and extend laterally when Battery 8 is installed. Battery 8 provides enough power to drive electric motor 12. Battery 8 can be any lithium-ion battery with a voltage of, for example, 10.8, 14.4, 18, 25.2, or 28 V. Battery 8 can be a lithium-ion battery with a voltage less than 10.8 V or greater than 36 V. Battery 8 can be any other type of battery. Multiple Batteries 8 can be used.

[0054] The control unit 20 is held above the battery mounting part 18.

[0055] The control unit 20 controls the electric motor 12. The control unit 20 is electrically connected to the electric motor 12. The control unit 20 is electrically connected to the body terminal of the battery mounting part 18 via the body connector 24.

[0056] The control unit 20 is electrically connected to the speed adjustment switch 22, the switching unit 25, the on / off switches 26 and the locking switches 27.

[0057] The speed control switch 22 is a rotary switch. The speed control switch 22 has a disc that extends forward-backward and laterally. The disc is rotatable about an imaginary central axis that extends vertically. The disc has a left-hand section that is exposed through a hole in the left surface of the main housing 40. The user rotates the disc by moving the left-hand section of the disc forward or backward. The speed control switch 22 outputs a signal according to the degree of rotation of the disc. The output signal is transmitted to the controller 20.

[0058] The speed adjustment switch 22 can be eliminated.

[0059] The body connector 24 is connected to a conductor wire (not shown) which connects the control 20 and the body connector on the battery mounting part 18.

[0060] The body connector 24 is reconnectable and therefore disconnectable. If the electric motor 12 needs to be replaced due to a fault, it can be easily replaced by disconnecting the body connector 24. In this case, the controller 20, which is connected to the electric motor 12, is replaced at the same time.

[0061] The body connector 24 may be omitted.

[0062] The switching unit 25 is located above the guard 39 near the body 2. The switching unit 25 is held in the housing 10.

[0063] The switching unit 25 includes a light (not shown). The light is, for example, a light-emitting diode (LED). The light illuminates a target area of ​​a workpiece being cut by the cutting blade 34 and an area around the target area. The light is switched on or off in response to the switching of the interlock switches 27. The light is switched on when the interlock switches 27 are switched on. The light is switched off after a predetermined time has elapsed following the switching off of the on / off switches 26. The light is switched off immediately when the interlock switches 27 are switched off.

[0064] The light is controlled by the control unit 20. The switching unit 25 is connected to the control unit 20 via a connecting wire (not shown).

[0065] The light may be off. The light may be separate from the switching unit 25. The light may be switched on or off in a different way than described above. For example, the light may be switched on or off by a separate light switch.

[0066] The on / off switches 26 are momentary switches. The left on / off switch 26 is held on a left front area of ​​the main housing 40. The right on / off switch 26 is held on a right front area of ​​the main housing 40.

[0067] The on / off switches 26 alternately transmit an on signal and an off signal to the controller 20 each time the on / off switches 26 are pressed by the user.

[0068] The locking switches 27 are momentary switches. The left locking switch 27 is located on the left front side of the main housing 40 and above the corresponding on / off switch 26. The right locking switch 27 is located on the right front side of the main housing 40 and above the corresponding on / off switch 26.

[0069] The locking switches 27 alternately transmit an on signal and an off signal to the control unit 20 each time the locking switch 27 is pressed by the user.

[0070] At least the on / off switches 26 or the interlock switches 27 can be of a different type. For example, the on / off switches 26 can be toggle switches instead of pushbuttons. Other switches can likewise be of any type.

[0071] In response to receiving an ON signal from the interlock switches 27, the controller 20 activates a timer to determine whether the predetermined time has elapsed. If, after receiving the ON signal, the controller 20 receives an ON signal from the ON / OFF switches 26 before the predetermined time has elapsed, the controller 20 switches on the power supply to the jigsaw 1 and drives the electric motor 12. The controller 20 controls the speed of the electric motor 12 based on the signal corresponding to the degree of rotation of the disc, which is received by the speed adjustment switch 22.

[0072] When the control unit 20 receives an on signal from the on / off switch 26 while the jigsaw 1 is switched on, the control unit 20 switches off the power supply to the jigsaw 1 and stops the electric motor 12. When the interlock switches 27 are switched off while the jigsaw 1 is switched on, the electric motor 12 is stopped and the light is switched off.

[0073] The controller 20 can, for example, control the power supply of the jigsaw 1 in any way other than as described above. A different controller can also be implemented in a different way.

[0074] The power transmission device 28 transmits power from the electric motor 12 to the cutting blade 34 via the sliding block 29 and the cutting blade holder 32. The sliding block 29 is a rectangular prism. The sliding block 29 extends vertically. The cutting blade holder 32 is held at a lower end region of the sliding block 29. The sliding block 29 can move back and forth in the vertical direction. The cutting blade holder 32 can move back and forth in the vertical direction.

[0075] The power transmission device 28 comprises an intermediate gear 65, a bearing shaft 66, a spacer 67, several (two) needle bearings 68 and a guide roller unit 69.

[0076] The intermediate gear 65 has a gear 65G, a first cam 65E, and a second cam 65F. The intermediate gear 65 is cylindrical and extends vertically. The intermediate gear 65 reduces the rotation of the motor shaft 53 and transmits the rotation to the sliding piece 29.

[0077] Gear 65G is located in the front section of intermediate gear 65. Gear 65G has several teeth on its outer curved surface. Gear 65G has a larger outer diameter than the rear section of intermediate gear 65. Gear 65G meshes with the drive pinion 54.

[0078] The first cam 65E is located in the rear area of ​​the intermediate gear 65. The first cam 65E has a cylindrical outer surface that is off-center from an imaginary central axis of the intermediate gear 65 extending in the front-back direction.

[0079] The second cam 65F is located in a central area of ​​the intermediate gear 65. The second cam 65F has a cylindrical outer surface that is off-center from the imaginary central axis of the intermediate gear 65, which extends in the front-back direction.

[0080] The bearing shaft 66 is cylindrical and extends in the front-back direction.

[0081] The bearing shaft 66 has a rear section that is fixed to the upper opening of the gearbox housing 42, with the cylindrical spacer 67 being located between the rear section of the bearing shaft 66 and the gearbox housing 42. The bearing shaft 66 projects forward from the rear inner surface of the gearbox housing 42.

[0082] Each needle bearing 68 surrounds a central area of ​​the bearing shaft 66. The two needle bearings 68 are arranged in the front-back direction.

[0083] Each needle bearing 68 supports the intermediate gear 65 in a rotatable manner about an imaginary central axis of the intermediate gear 65.

[0084] The needle bearings 68 and the bearing shaft 66 are located radially inwards from the intermediate gear 65.

[0085] The guide roller unit 69 has a shaft 70, a needle bearing 72 and a guide roller 74.

[0086] The shaft 70 is cylindrical. The shaft 70 extends in the front-back direction. The shaft 70 has a rear section that is fixed to the gear 65G. The shaft 70 is off-center from the gear 65G. The shaft 70 projects forward from the front surface of the gear 65G.

[0087] The needle bearing 72 is mounted on the front part of the shaft 70.

[0088] The guide roller 74 is cylindrical. The guide roller 74 is mounted on the needle bearing 72 in a manner that allows it to rotate about an imaginary central axis extending in the front-back direction. The guide roller 74 is located at the front of the gear 65G.

[0089] The sliding piece 29 extends vertically and is vertically movable.

[0090] The sliding piece 29 has a roller guide 80, a shaft 82 and a sliding piece body 84.

[0091] The roller guide 80 extends laterally. The roller guide 80 has a groove that extends laterally. The roller guide 80 receives the guide roller 74 in the groove in such a way that it allows lateral movement of the guide roller 74.

[0092] The shaft 82 is cylindrical and extends laterally.

[0093] The sliding element body 84 is a rectangular prism extending vertically. The sliding element body 84 is attached to the roller guide 80 by means of the shaft 82 positioned between the sliding element body 84 and the roller guide 80. The shaft 82 extends through a lower end region of the roller guide 80 and an upper end region of the sliding element body 84. The sliding element body 84 is pivotable backward and forward around the shaft 82.

[0094] The guide roller 74 in the guide roller unit 69, which is off-center from the intermediate gear 65, moves laterally in the roller guide 80 at the sliding piece 29, so that only a vertical movement can be transmitted to the roller guide 80. The sliding piece 29 thus moves vertically back and forth when the intermediate gear 65 rotates. The guide roller 74 and the roller guide 80 convert a rotational force into a reciprocating motion.

[0095] The sliding guide 30 is cylindrical and extends vertically. The sliding body 84 extends radially inwards from the sliding guide 30. The sliding guide 30 guides the sliding piece 29, which moves back and forth. The sliding guide 30 is held by the gearbox housing 42.

[0096] The dust seal 31 is annular and elastic. The dust seal 31 is held by the gearbox housing 42. The sliding element body 84 extends radially inwards from an inner hole in the dust seal 31. The dust seal 31 is in contact with the sliding element 29, thereby reducing the ingress of dust into the housing 10.

[0097] The cutting blade holder 32 is held by the sliding block body 84. The cutting blade holder 32 is connected to a lower end region of the sliding block body 84. The cutting blade 34 can be attached to and removed from the cutting blade holder 32.

[0098] The cutting blade 34 extends vertically. The cutting blade 34 has a workpiece machining part on one of its long edges. The workpiece machining part processes a workpiece. The workpiece machining part is, for example, a saw blade that cuts a workpiece. The cutting blade 34 has its upper end attached to the cutting blade holder 32, with the workpiece machining part facing forward. The cutting blade 34 is attached to the cutting blade holder 32 without the use of a tool, such as a wrench, or in other words, without tools.

[0099] The cutting blade holder 32 will be described in detail later.

[0100] The tool opener 35 is a lever and extends laterally. It is rotatable on an imaginary vertical axis located at its right end. The user can open the tool opener 35 by moving its left end forward. The tool opener 35 is biased by a spring 86, an elastic component, in a direction of rotation that pulls the left end backward, or in other words, in a closing direction.

[0101] The cutting blade holder 32 is adjacent to an inner area of ​​the left end area of ​​the tool opener 35 in the lateral direction.

[0102] The tool opener 35 is made of a translucent synthetic resin. The tool opener 35 transmits light. The tool opener 35 may or may not be translucent.

[0103] The orbital unit 36 ​​has a pressure plate 90, a holding shaft 91, a roller holder 92, a roller shaft 94, a back roller 96 and a needle bearing 97.

[0104] The pressure plate 90 extends vertically and laterally. The pressure plate 90 has a first cam hole in its upper region. The first cam 65E is positioned radially inside the first cam hole. The first cam 65E moves the pressure plate 90 vertically across the inner surface of the first cam hole. The first cam 65E is off-center in the opposite phase to the guide roller unit 69.

[0105] The retaining shaft 91 is cylindrical and extends laterally.

[0106] The roller holder 92 is located below the pressure plate 90. The roller holder 92 has an upper plate 92U and several (two) arms 92A. The upper plate 92U extends in the front-back and sideways directions. Each arm 92A extends in the front-back and vertical directions, extending forward and downward from the left or right edge of the upper plate 92U. The retaining shaft 91 extends between the middle sections of the arms 92A. The roller holder 92 is held by the gear housing 42 in a pivotable manner around the retaining shaft 91.

[0107] The roller shaft 94 is cylindrical and extends laterally. The roller shaft 94 extends between the lower end regions of the arms 92A on the roller holder 92.

[0108] The back roller 96 is cylindrical and extends laterally. The back roller 96 is rotatably mounted on the roller shaft 94, with the needle bearing 97 between them. The back roller 96 can be in contact with the rear edge of the cutting blade 34 without interfering with the reciprocating movement of the cutting blade 34.

[0109] The orbital switch 37 has a shaft 37S and a knob 37K.

[0110] The shaft 37S extends laterally. The shaft 37S has a central section with a semicircular cross-section when viewed from right to left. The central section of the shaft 37S is semi-cylindrical. The shaft 37S is located above the upper plate 92U at the roller holder 92 at the orbital unit 36 ​​and behind a lower end section of the pressure plate 90.

[0111] The knob 37K is fixed to the left end of the shaft 37S. The knob 37K extends radially outwards from the shaft 37S.

[0112] The user can operate the knob 37K to rotate the orbital switch 37 about an imaginary central axis of the shaft 37S. The knob 37K is rotatable between markings 0 and III on the outer surface of the gear housing 42. One recess is located adjacent to marking 0, and one recess is located adjacent to marking III between these markings. Two recesses are arranged between the recess adjacent to marking 0 and the recess adjacent to marking III. These two recesses are adjacent to the recess adjacent to marking III. In other words, three recesses are arranged adjacent to marking III. Some or all of these recesses and the marking may be omitted.

[0113] The user switches the orbital movement mode of the cutting blade 34, if appropriate, by actuating the knob 37K. The orbital movement of the cutting blade 34 is based on the back-to-back oscillation of the rear roller 96 in contact with the cutting blade 34.

[0114] When the knob 37K is at position 0, the semi-cylindrical section of the shaft 37S is in a rotational position where its curved surface faces downwards and it is in contact with the upper plate 92U at the roller holder 92. In this case, the back roller 96 is in the same position, without oscillating, regardless of the vertical position of the pressure plate 90, which is vertically movable by the first cam 65E. Thus, the cutting blade 34 does not perform any orbital movement.

[0115] When the knob 37K is in the position away from mark 0, the semi-cylindrical section of the shaft 37S separates from the upper plate 92U at the roller holder 92. The pressure plate 90, moving vertically, causes the roller holder 92 and the back roller 96 to oscillate with the upper plate 92U. The back roller 96 exerts a force on the cutting blade 34 in the front-back direction. This force causes the sliding body 84, the cutting blade holder 32, and the cutting blade 34 to oscillate around the shaft 82. The cutting blade 34, moving vertically, absorbs the oscillating motion in the front-back direction. This causes the cutting blade 34 to perform an orbital motion along an imaginary ellipse when viewed from right to left. The semi-cylindrical section of the shaft 37S gradually separates from the upper plate 92U, while the knob 37K moves away from the mark 0.The degree of vibration of the roller holder 92 and the back roller 96 changes based on the rotational position of the knob 37K. For example, when the knob 37K is rotated to a position corresponding to mark III, the degree of vibration of the roller holder 92 and the back roller 96 is at its maximum. The mode of orbital motion thus changes based on the rotational position of the knob 37K. The degree of orbital motion can be switched between three different values ​​by adjusting the position of the knob 37K to align with one of the three recesses or the positions of the marks, as described above.

[0116] The counterweight unit 38 has a counterweight 100 and a shaft 102.

[0117] The counterweight 100 is a plate extending vertically and laterally. The counterweight 100 has a cam hole in its central area in the vertical direction and an upper hole above the cam hole. The cam hole in the counterweight 100 accommodates the second cam 65F on the intermediate gear 65. The second cam 65F is off-center in the opposite phase to the guide roller assembly 69.

[0118] The shaft 102 extends in the front-back direction. The shaft 102 is held by the gearbox housing 42. The shaft 102 extends between a front wall and a rear wall of the gearbox housing 42. The shaft 102 has a central section that is received in the upper hole of the counterweight 100.

[0119] The counterweight 100 is moved vertically in the opposite phase to the sliding block 29, the cutting blade holder 32, and the cutting blade 34 by the second cam 65F, which is decentered in the opposite phase to the guide roller unit 69. The counterweight 100 thus reduces vibrations resulting from the reciprocating movement of the sliding block 29, the cutting blade holder 32, and the cutting blade 34.

[0120] The guard 39 extends vertically. The upper end of the guard 39 is held by the gearbox housing 42. The lower end of the guard 39 is adjacent to the upper surface of the base unit 6.

[0121] The cutting blade 34 is located behind the guard 39.

[0122] Base unit 6 is located below body 2 and is attached to body 2.

[0123] The base unit 6 includes the base 110, a base plate 112, several (four) screws (not shown), a nut 114, a bolt 116 and a retaining plate 117.

[0124] Base 110 is made of an aluminum die-cast alloy. Base 110 is a plate that extends in the front-back and sideways directions.

[0125] The base 110 has the branched area at the front. The cutting blade 34 can pass through the space defined by the branched area of ​​the base 110.

[0126] The base 110 has ruler mounting parts 119. The ruler mounting parts 119 are located at the front ends of the branched area of ​​the base 110. The ruler mounting parts 119 can accommodate a single ruler.

[0127] The base plate 112 is made of metal and is a steel plate. The base plate 112 is located on a lower surface area of ​​the base unit 6 to reduce wear of the base unit 6 caused by contact with a workpiece.

[0128] The base plate 112 is connected to a lower area of ​​the base 110 by means of four screws.

[0129] The nut 114 is held by the lower rear section of the gearbox housing 42. The nut 114 is located in the center of the body 2 in the lateral direction.

[0130] Mother 114 can be a component of body 2 or can be independent of body 2.

[0131] The bolt 116 extends vertically with its head pointing downwards.

[0132] The retaining plate 117 is a plate. The retaining plate 117 has an arcuate cross-section. The retaining plate 117 has a bolt hole in its center. The retaining plate 117 may be omitted.

[0133] The bolt 116 is placed through the bolt hole in the retaining plate 117 and in a cross-shaped hole in the base 110 and is received in the nut 114.

[0134] The base unit 6 is attached to the gearbox housing 42 by means of the bolt 116, which is received in the nut 114 and in the retaining plate 117.

[0135] The user shall, where appropriate, change at least one of the orientation of body 2 relative to base unit 6 (the tilt angle of body 2 to the left or to the right) or the position of body 2 relative to base unit 6 in the front-back direction.

[0136] To change the orientation of body 2 relative to base unit 6, the user loosens bolt 116. Base unit 6, which is secured by retaining plate 117, is then loose, allowing bolt 116 to move along the cross-shaped hole. The user moves bolt 116 along a laterally elongated portion of the cross-shaped hole to change the orientation of body 2 relative to base unit 6. In other words, the user changes the tilt angle of body 2 relative to base unit 6. The user tightens bolt 116 at the desired orientation to complete the orientation change.

[0137] To change the position of the body 2 relative to the base unit 6 in the front-back direction, the user loosens the bolt 116, moves the bolt 116 along a region of the cross-shaped hole that is elongated in the front-back direction, and tightens the bolt 116 at a desired position.

[0138] When the bolt 116 is at the intersection area between the area of ​​the cross-shaped hole that is elongated in the front-back direction and the area of ​​the cross-shaped hole that is elongated in the side direction, the body 2 is at a reference position relative to the base unit 6. Fig. Figures 1 to 3 show the jigsaw 1 with the body 2 in the reference position.

[0139] The cutting blade holder 32 will now be described in more detail.

[0140] Fig. 4 and Fig. Figure 5 is a perspective exploded view of the cutting blade 34, the cutting blade holder 32, and the sliding block body 84. Fig. 4 and Fig. The cutting blade 34 has not yet been introduced.

[0141] The cutting blade 34 has several (two) projections 34C in its end region adjacent to the body 2, or in other words, in its upper end region, which is the end region adjacent to the body. The projections 34C are arranged on the front and rear of the cutting blade 34. The front projection 34C projects forward from the front side of the upper end region of the cutting blade 34. The rear projection 34C projects backward from the rear side of the upper end region of the cutting blade 34. With the projections 34C, the upper end region of the cutting blade 34 has a cross shape.

[0142] The sliding body 84 has a guide 84G in its lower end region, which is an end region opposite an end region adjacent to the body 2. The guide 84G is a cylindrical metal block having a groove, a slot, and a hole. The guide 84G is fixed to the lower end of a different region of the sliding body 84 than the guide 84G. The guide 84G can be integral with the region of the sliding body 84 that is a rectangular prism, unlike the guide 84G.

[0143] The guide 84G has a blade receiving groove 84C, a guide hole 84H, an engagement area guide slot 84S, a stop receiving hole 84P and a flange 84F.

[0144] The blade receiving groove 84C is located on a central region of the guide 84G in the lateral direction. The blade receiving groove 84C extends in the front-back direction and in the vertical direction. The blade receiving groove 84C has a lower region that reaches the outer surface of the guide 84G in the front-back direction. The lower region of the blade receiving groove 84C serves as slots. The other region of the blade receiving groove 84C besides the slots is a hole that combines a rectangular space and a semi-cylindrical space when viewed from bottom to top. The semi-cylindrical space is located on the left side of the rectangular space. The hole of the blade receiving groove 84C has a semi-cylindrical left inner surface.

[0145] The guide hole 84H extends laterally. The guide hole 84H is located on the right side of the blade receiving groove 84C and connects with the blade receiving groove 84C.

[0146] The engagement guide slot 84S is located on the left side of the blade receiving groove 84C. The engagement guide slot 84S connects to the blade receiving groove 84C. The engagement guide slot 84S reaches the left outer surface of the guide 84G. The engagement guide slot 84S extends vertically.

[0147] The stop mounting hole 84P is located between the sheet mounting groove 84C and the engagement guide slot 84S in the circumferential direction. The stop mounting hole 84P extends obliquely from the left front to the right rear. The stop mounting hole 84P connects with the sheet mounting groove 84C.

[0148] The flange 84F is located at an upper end region of the guide 84G. The flange 84F projects radially outwards from a region adjacent to the flange 84G. The flange 84F is annular when viewed from bottom to top.

[0149] At least one of the grooves, slots, or holes can be modified differently. For example, the engagement guide slot 84S may or may not reach the outer surface of the guide 84G. The stop receiving hole 84P may or may not be connected to the sheet receiving groove 84C.

[0150] The cutting blade holder 32 has a first pressing component 130, a sleeve 132, a first preloading component 134, a stop 136, a retaining ring 138, a cover 140, a second pressing component 142 and a second preloading component 144.

[0151] The first die-cutting component 130 is pin-shaped. The first die-cutting component 130 has a first die-cutting component body 130B and a first die-cutting component head 130H.

[0152] The first die-casting component 130B is a prism that extends laterally and slides in the guide hole 84H. The first die-casting component 130 moves laterally. The first die-casting component 130 can be moved towards or away from the cutting blade 34.

[0153] The first die head 130H is located on the right side of the first die body 130B. The first die head 130H extends further than the right end region of the first die body 130B in both the vertical and front-to-back directions. This reduces the probability that the entire first die 130 will enter a region of the guide hole 84H radially inward from an open area located radially outside the guide hole 84H.

[0154] The first pressing component 130 is located radially inside the sleeve 132. The first pressing component 130 can press the cutting blade 34.

[0155] As in Fig. As shown in Figure 6, the sleeve 132 is a cylindrical cap. The sleeve 132 has a sleeve body 132B, a handle 132H, a retaining ring groove 132S, a first cam surface 132C, a cutting blade through hole 132P, several (two) cutting blade holding areas 132L, an engagement area guide 132G, and a second cam surface 132D. The directions shown in Fig. The 6 shown refer to the case when the cutting blade is locked.

[0156] The 132B sleeve body is a cap that has a cylindrical area extending vertically and a lower surface area.

[0157] The handle 132H is a lever that projects radially outwards from the left area of ​​the sleeve body 132B.

[0158] The retaining ring groove 132S is located on the inner surface of an upper opening in the sleeve body 132B. The retaining ring groove 132S is annular and has a break. The break is located at a base end of the handle 132H. The retaining ring groove 132S is radially recessed outwards from the adjacent inner surface.

[0159] The first cam surface 132C is a right-hand area of ​​the inner surface of a lower area of ​​the sleeve body 132B. The first cam surface 132C is located radially outside of the first pressing component 130. The first cam surface 132C has an inner diameter that gradually decreases from the front to the rear.

[0160] The first pressed component 130 is located radially inside the first cam surface 132C. The first pressed component head 130H has a radial outer surface, or in other words, a right-hand surface, which comes into contact with the first cam surface 132C. The first pressed component 130 can move along the first cam surface 132C by a rotational movement relative to the sleeve 132.

[0161] The blade passage hole 132P is located in the lower surface region of the sleeve body 132B. The blade passage hole 132P has the shape of φ. In its circular region, viewed from bottom to top, the blade passage hole 132P has a diameter that is equal to or slightly larger than the dimension of a region of the upper end of the cutting blade 34 excluding the projections 34C in the front-back direction (in other words, the width of the cutting blade 34). In its rectangular region, viewed from bottom to top, the blade passage hole 132P has long sides with a dimension that is equal to or slightly larger than the dimension of a region of the upper end of the cutting blade 34 including the projections 34C in the front-back direction.

[0162] The blade holding areas 132L are arranged in the front-to-back direction. Each blade holding area 132L is located in the lower surface area of ​​the sleeve body 132B and adjacent to the blade passage hole 132P. Specifically, the front blade holding area 132L is located counterclockwise from the front end of the rectangular area that extends elongated radially outward from the circular area of ​​the blade passage hole 132P when viewed from bottom to top. The rear blade holding area 132L is located counterclockwise from the rear end of the rectangular area that extends elongated radially outward from the circular area of ​​the blade passage hole 132P when viewed from bottom to top.

[0163] The engagement area guide 132G is the inner surface of the left area of ​​the sleeve body 132B. The engagement area guide 132G is located on the left side of the first cam surface 132C. The engagement area guide 132G is a groove with a larger inner diameter than the adjacent first cam surface 132C. The engagement area guide 132G is located on the left side of the rear cutting blade retaining area 132L.

[0164] The second cam surface 132D is the inner surface of a left-hand area of ​​the lower surface region of the sleeve body 132B, adjacent to the blade passage hole 132P. The second cam surface 132D is adjacent to the cutting blade holding areas 132L. The second cam surface 132D is located on the left side of a lower end region of the engagement area guide 132G. The vertical position, or more specifically the height, of the second cam surface 132D varies. The second cam surface 132D has its greatest height at a position closest to the engagement area guide 132G and has a gradually decreasing height toward the left front in the circumferential direction.

[0165] The first preloading component 134 is an elastic component. The first preloading component 134 is a torsion spring. The first preloading component 134 is ring-shaped and extends in the front-back direction and in the side direction. The first preloading component 134 preloads the sleeve 132 counterclockwise when viewed from bottom to top. The first preloading component 134 preloads the first pressing component 130 through the sleeve 132.

[0166] The first preload component 134 has an upper end area that extends radially outwards and is held by the handle 132H at the sleeve 132.

[0167] The first prestressing component 134 has a lower end region that extends vertically. The first prestressing component 134 is stopped by the stop 136. To clearly illustrate the components in the perspective views, Fig. 4 and Fig. 5 the first prestressing component 134 and the stop 136 in contact with each other.

[0168] The stop 136 is pin-shaped and is received in the stop receiving hole 84P in the guide 84G in the sliding piece body 84.

[0169] The first pre-tensioning component 134 is located above the first pressing component 130. The first pre-tensioning component 134 can also be located below the first pressing component 130. This reduces the size of the cutting blade holder 32 in the radial direction.

[0170] The first preload component 134 is located radially inwards from the sleeve 132.

[0171] The retaining ring 138 is located above the flange 84F on the guide 84G and is held in the retaining ring groove 132S on the sleeve 132. The retaining ring 138 prevents the sleeve 132 from slipping off the guide 84G.

[0172] The cover 140 is ring-shaped. The cover 140 fits onto an upper end opening of the sleeve 132 to cover the upper end opening. The cover 140 reduces the ingress of dust into the sleeve 132.

[0173] The second push-fit component 142 is pin-shaped and extends vertically. The second push-fit component 142 has a push-fit area 142P, a tongue 142T and an engagement area 142F.

[0174] The pressing area 142P is cylindrical and extends vertically. The pressing area 142P is located in an upper end region of the second pressing component 142. An imaginary center line of the pressing area 142P extends vertically, or its extension passes through the attached cutting blade 34.

[0175] The tongue 142T is a plate with a cylindrical surface. The tongue 142T extends downwards from a left-hand portion of the lower end of the pressing area 142P. The cylindrical surface of the tongue 142T continues seamlessly with the cylindrical surface of the left-hand portion of the pressing area 142P. The tongue 142T is located radially inside the first preloading element 134. This effectively utilizes the space within the cutting blade holder 32, allowing the cutting blade holder 32 to be more compact. The second pressing element 142 extends through the interior space of the first preloading element 134. The tongue 142T connects the pressing area 142P and the engagement area 142F. The pressing area 142P, the tongue 142T, and the engagement area 142F are integral components. The tongue 142T, which extends vertically, is offset laterally from the imaginary center line of the pressure area 142P.

[0176] The intervention area 142F is a plate and extends vertically and laterally. The intervention area 142F projects to the left of the left surface of a lower end region of the tongue 142T.

[0177] The pressure area 142P and the tongue 142T are received in the blade receiving groove 84C on the guide 84G in a vertically movable manner. The pressure area 142P and the tongue 142T have semi-cylindrical left surfaces that are continuously aligned with each other. The left surfaces of the pressure area 142P and the tongue 142T are located along and in contact with the semi-cylindrical left inner surface of the blade receiving groove 84C. The pressure area 142P and the tongue 142T move as they are guided through the blade receiving groove 84C. The engagement area 142F is received in the engagement area guide slot 84S in the guide 84G in a vertically movable manner. The engagement area 142F moves vertically as it is guided through the engagement area guide slot 84S. The engagement area 142F is received in the engagement area guide 132G in the sleeve 132 in a vertically movable manner.The engagement area 142F moves vertically while being guided by the engagement area guide 132G.

[0178] The second pressing component 142 can press the cutting blade 34.

[0179] The second preload component 144 is an elastic component. The second preload component 144 is a compression spring. The second preload component 144 extends vertically. The second preload component 144 preloads the second compression component 142 downwards.

[0180] The second prestressing component 144 is located above the second pressing component 142. The second prestressing component 144 is received in an upper end region of the blade mounting groove 84C.

[0181] The cutting blade holder 32 is connected to the guide 84G on the sliding body 84 in the manner described below. Although the connection process is carried out in the directions shown in the figures for ease of understanding, the actual connection process can be carried out with different components oriented in directions other than those described below.

[0182] The second preload component 144 and the second pressing component 142 are placed in the blade receiving groove 84C. The retaining ring 138 is placed above the flange 84F. The first pressing component 130 is placed in the guide hole 84H. The stop 136 is placed in the stop receiving hole 84P such that it does not protrude radially outwards.

[0183] The upper end of the first preloading element 134, which is attached to the handle 132H in the sleeve 132, moves the sleeve 132 relatively radially outward from the lower end of the guide 84G. The retaining ring 138 is engaged in the retaining ring receptacle 132S. The engagement area 142F of the second pressing element 142 is engaged in the engagement area guide 132G in the sleeve 132. The sleeve 132 is then moved to cause a radially outer end of the stop 136 to project radially outward from the stop receptacle hole 84P, thereby causing the lower end of the first preloading element 134 to engage with the stop 136.

[0184] Finally, the cover 140 is fitted onto the upper opening in the sleeve 132.

[0185] The cutting blade holder 32 allows the cutting blade 34 to be automatically attached in a tool-free manner in a single operation, when the cutting blade 34 is simply inserted between the first pressing component 130 and the second pressing component 142.

[0186] The attachment of the cutting blade 34 is described below sequentially using the states of the cutting blade 34 before insertion, during insertion, during pressing, and when it is locked. The four states mentioned above are distinguished for the sake of simplicity. The actual attachment of the cutting blade 34 is performed in a sequence of operations within a short time.

[0187] Fig. 7A is a bottom view of the cutting blade holder 32 before the insertion of the cutting blade 34. Fig. 7B is a bottom view of the cutting blade holder 32, locked to the cutting blade 34. Fig. Figure 8A is a cross-sectional view of the cutting blade holder 32 along line AA before and during the insertion of the cutting blade 34. Fig. 8B is a cross-sectional view along line CC in Fig. 8A. Fig. 9A is a cross-sectional view of the cutting blade holder 32 along line AA during pressing of the cutting blade 34. Fig. 9B is a cross-sectional view along line DD in Fig. 9A. Fig. Figure 10A is a cross-sectional view of the cutting blade holder 32 along line AA when the cutting blade 34 is locked. Fig. 10B is a cross-sectional view along line EE in Fig. 10A. Fig. 11A is a cross-sectional view along line FF in Fig. 8B. Fig. 11B is a cross-sectional view along line GG in Fig. 9B. Fig. 11C is a cross-sectional view along the HH line in Fig. 10B.

[0188] The rectangular area of ​​the cutting blade through-hole 132P at the sleeve 132 points in the front-back direction before the cutting blade 34 is inserted. The handle 132H is located at the front and slightly to the left (at the one o'clock position). Fig. 7A and Fig. 8B).

[0189] The first preloading component 134 preloads the sleeve 132 clockwise when viewed from bottom to top ( Fig. 8B). The second prestressing component 144 has an equilibrium length or a length close to the equilibrium length.

[0190] Furthermore, the engagement area 142F of the second pressing component 142 is received in the engagement area guide 132G. This restricts the sleeve 132, which is under a preload force from the first preloading component 134, from rotating clockwise. In other words, the sleeve 132 is locked in a non-rotatable manner. The engagement area 142F has a lower edge region in contact with the inner surface of a lower surface region of the sleeve 132. The second pressing component 142 is thus prevented from slipping out.

[0191] The engagement area 142F is incorporated into the engagement area guide 132G and engages with it to stop the rotation of the sleeve 132. While maintaining the compactness of the cutting blade holder 32, the structure can stop the rotation of the sleeve 132.

[0192] The first die-cast component 130 is located radially inward from a large-diameter area of ​​the first cam surface 132C. The first die-cast component body 130B can move slightly to the right and easily retract from the blade receiving groove 84C.

[0193] In this state, the end of the cutting blade 34 adjacent to the projections 34C, which is inserted into the cutting blade holder 32, first passes through the rectangular area of ​​the cutting blade through-hole 132P. The cutting blade 34 is thus guided in such a way that it is in an orientation for installation in which the cutting blade 34 extends in the front-back direction and in the vertical direction.

[0194] The end of the cutting blade 34 then passes between the first pressing component 130 and the second pressing component 142.

[0195] The end of the cutting blade 34 then comes into contact with the lower surface of the pressing area 142P of the second pressing component 142 (the double dot-dash lines in Fig. 8A, Fig. 8B and Fig. 11A).

[0196] The tool opener 35 is not actuated during the insertion of the cutting blade 34 as described above, nor during the pressing of the cutting blade 34 as described below. The tool opener 35 is used when removing the cutting blade 34.

[0197] The cutting blade 34 is moved further upwards and presses the second pressing component 142. This corresponds to pressing the cutting blade 34.

[0198] The pressure area 142P is pressed upwards through the end of the cutting blade 34 against a preload force from the second preloading component 144. The left surfaces of the pressure area 142P and the tongue 142T are guided by the left surface of the blade receiving groove 84C. The engagement area 142F is guided by the engagement area guide slot 84S and the engagement area guide 132G. Each projection 34C of the cutting blade 34 is guided by the corresponding slot in the blade receiving groove 84C.

[0199] The lower edge of the engagement area 142F then reaches a position higher than an upper edge of the engagement area guide 132G in the sleeve 132. The engagement area 142F thus moves out of the engagement area guide 132G and is unlocked by the engagement area guide 132G. The sleeve 132 automatically rotates clockwise under the preload force of the first preloading component 134 when viewed from bottom to top.

[0200] The sleeve 132 stops rotating when the first forming element 130 enters a predetermined state. Specifically, the sleeve 132 stops rotating when the first forming element head 130H comes into contact with the first cam surface 132C of the sleeve 132 and the first forming element body 130B presses its left surface against the right surface of the cutting blade 34. The first forming element 130 moves to the left along the first cam surface 132C during the rotation of the sleeve 132. The first forming element 130 is pre-tensioned by the first pre-tensioning element 134 through the sleeve 132 after the rotation of the sleeve 132. Specifically, the first cam surface 132C converts the clockwise preload force of the first pressing component 130, when viewed from bottom to top, into a counterclockwise preload force that is applied to the first pressing component 130.If no cutting blade 34 is inserted, the first preloading element 134 is contracted, with its arm being rotated 50° from its free angle. If the cutting blade 34 is inserted, the first preloading element 134 is contracted, with its arm being rotated 60° from its free angle. The first pressing element 130 automatically presses the cutting blade 34 in response to the second pressing element 142 being pushed upwards. The angles by which the first preloading element 134 is rotated from its free angle in each state can be changed from the values ​​described above.

[0201] In the state described above, the rectangular area of ​​the blade passage hole 132P is oriented obliquely from the rear right to the front left when viewed from bottom to top. The projections 34C on the cutting blade 34 are located above the lower surface area of ​​the sleeve body 132B. The lower edge of each projection 34C is in contact with the corresponding cutting blade retaining area 132L. Each projection 34C is biased toward the corresponding cutting blade retaining area 132L by the second biasing element 144. The upper edge of each projection 34C is spaced from the upper end of the corresponding slot at the blade receiving groove 84C. The handle 132H is located to the left (at the three o'clock position). Fig. 7B and Fig. 10B).

[0202] After the rotation of the sleeve 132 is complete, the cutting blade 34 is locked in the cutting blade holder 32.

[0203] When the cutting blade 34 is locked, the cutting blade 34 is held between the first pressing component 130 and the left inner surface of the blade receiving groove 84C, as shown in Fig. Figure 10B shows that a central area of ​​the right surface of the cutting blade 34, in the front-back direction, is in contact with the left end surface of the first pressing component 130. A front and a rear area of ​​the left surface of the cutting blade 34 are in contact with the left inner surface of the blade receiving groove 84C. Each projection 34C on the cutting blade 34 is held against the corresponding cutting blade retaining area 132L on the sleeve 132. The cutting blade 34 is thus prevented from slipping out.

[0204] The cutting blade 34, which is attached to the cutting blade holder 32, has an imaginary center line extending in the same direction as the cutting blade 34, or more specifically, in the vertical direction. The cutting blade holder 32 also has an imaginary center line extending in the same direction as the cutting blade holder 32, and more specifically, in the vertical direction. The imaginary center axis of the cutting blade 34, which is attached to the cutting blade holder 32, is offset from the imaginary center line of the cutting blade holder 32 in the direction of the first pressing component 130 in a direction perpendicular to the direction of the reciprocating movement, or more specifically, to the lateral direction. The cutting blade 34 is offset to the right of the center of the cutting blade holder 32. This allows the cutting blade holder 32 to accommodate cutting blades of varying thicknesses.

[0205] The cutting blade 34 is removed in the manner described below.

[0206] When a left area of ​​the tool opener 35 is moved forward while the power supply to the jigsaw 1 is off, a left rear area of ​​the tool opener 35 moves the handle 132H at the sleeve 132 against the preload force of the first preloading component 134.

[0207] The sleeve 132 then rotates counterclockwise when viewed from bottom to top. The sleeve 132 in the state in Fig. 7B thus enters the state in Fig.7A. The engagement area 142F of the second pressing component 142 moves downwards relative to the second cam surface 132D under the preload force of the second preloading component 144 during the rotation of the sleeve 132. At the end of the rotation of the sleeve 132, the engagement area 142F is engaged in the engagement area guide 132G by one end of the second cam surface 132D to stop the rotation of the sleeve 132.

[0208] The large-diameter area of ​​the first cam surface 132C is located on the right side of the first pressing element 130. The first pressing element 130 can move freely to the right, opposite to the cutting blade 34, without absorbing the preload force from the first preloading element 134. The direction in which the rectangular area of ​​the cutting blade through-hole 132P is oriented changes from an oblique direction to a front-back direction. The rectangular area of ​​the cutting blade through-hole 132P is in a rotational position in which the projections 34C on the cutting blade 34 can pass through the rectangular area of ​​the cutting blade through-hole 132P. Each projection 34C is moved away from the corresponding cutting blade holding area 132L by rotating the sleeve 132. The cutting blade 34 is thus pressed downwards under the preload force of the second preloading component 144 through the second pressing component 142.

[0209] In the cutting blade holder 32, the first preload element 134 is offset vertically from the first pressing element 130 and is located above the first pressing element 130. Specifically, the movable first preload element 134 does not overlap with the first pressing element 130 when viewed in a direction perpendicular to the direction in which the sliding element body 84 extends (the radial direction of the sleeve 132), regardless of the position of the first preload element 134. In other words, the movable first preload element 134 does not overlap the first pressing element 130 when viewed in the direction of movement of the first pressing element 130 (specifically in the lateral direction), regardless of the position of the first preload element 134. Specifically, the first preload element 134 is positioned such that it is prevented from moving in the direction of movement of the first pressing element. 130 is located.

[0210] The jigsaw 1 with this structure can reduce the size of the first preload component 134 in at least one direction, either front-back or side-to-side, and specifically the size of the first preload component 134 in the front-back and side-to-side directions, thereby optimizing its size. This structure also reduces the size of the blade holder 32 in the front-back and side-to-side directions, allowing the blade holder 32 to have a smaller diameter. This improves the visibility of the area around the blade 34, thus improving the handling of the jigsaw 1 during cutting or other operations.

[0211] With the preload force from the first preloading component 134 and the preload force from the second preloading component 144 on the jigsaw 1, the user can easily attach the cutting blade 34 by simply inserting the cutting blade 34 into the cutting blade holder 32 without actuating the tool opener 35. The user can easily remove the attached cutting blade 34 by simply actuating the tool opener 35 to move the handle 132H forward.

[0212] In the cutting blade holder 32, the cutting blade 34 is held primarily between the first pressing component 130 and the second pressing component 142. The upper edge of each projection 34C is spaced from the upper end of the corresponding slot in the blade receiving groove 84C.

[0213] This reduces wear on the upper and lower edges of the projections 34C. This reduces the likelihood of a change in the angle at which the cutting blade 34 is attached, and thus reduces the likelihood of handling being impaired.

[0214] An operating example of the jigsaw 1 will now be described.

[0215] The user attaches the cutting blade 34 to the cutting blade holder 32. The user can easily attach the cutting blade 34 to the cutting blade holder 32 by placing the upper end of the cutting blade 34 in the cutting blade holder 32 and then gently pressing the cutting blade 34 into place.

[0216] The user attaches the charged battery 8 to the battery mounting part 18.

[0217] If the user operates the on / off switches 26 within the predetermined time after actuating the locking switches 27, the control unit 20 supplies power from the battery 8 to the electric motor 12, controlling the rotation of the motor shaft 53 at a controlled speed. The electric motor 12 is driven at a speed corresponding to the rotational position of the speed adjustment switch 22.

[0218] The direction of rotation of the motor shaft 53 can be switched.

[0219] When the motor shaft 53 rotates, the fan wheel 14 rotates and generates an airflow (specifically a wind) in the body 2, which flows outwards in the radial direction of the fan wheel 14 from the inlets 44 and gaps in the housing 10.

[0220] This cools the internal components of the jigsaw 1, including the electric motor 12 and the control unit 20.

[0221] The rotational force of the motor shaft 53 is converted into reciprocating motion by lowering it on the intermediate gear 65 and transmitted to the sliding piece 29, the cutting blade holder 32 and the cutting blade 34.

[0222] The counterweight unit 38 reduces vibrations of the jigsaw 1.

[0223] The user switches the orbital movement mode of the cutting blade 34 by actuating the knob 37K, if appropriate.

[0224] The user sets the speed of the reciprocating movement of the cutting blade 34 using the speed adjustment switch 22.

[0225] The user positions the workpiece processing part of the reciprocating cutting blade 34 at a target area of ​​the workpiece and moves the cutting blade 34 relative to the workpiece. The target area of ​​the workpiece is thus cut with the cutting blade 34.

[0226] When the processing is complete, the user operates the on / off switch 26 to switch off the electric motor 12. The cutting blade 34 then stops. The user removes the battery 8 and the cutting blade 34, if appropriate.

[0227] The user can remove the cutting blade in a tool-free manner with a single action by actuating the tool opener 35.

[0228] The embodiment described above and its modifications are not limited to the structures described above, but can be modified as appropriate, as described below.

[0229] In the jigsaw 1, the first pressure component 130 does not automatically press the cutting blade 34 when the second pressure component 142 is pressed by the cutting blade 34. For example, the cutting blade 34 can be attached by the user holding down the actuation to move the tool opener 35 forward.

[0230] The rotation transmitted from the motor shaft 53 to the cutting blade 34 in the jigsaw 1 can be reduced by a reduction device other than the drive pinion 54 and the intermediate gear 65. The rotary drive force transmitted from the motor shaft 53 to the saw blade 34 in the jigsaw 1 can be converted by a reciprocating motion conversion device other than the guide roller unit 69 and the roller guide 80.

[0231] The jigsaw 1 may have a power cord instead of the battery mounting part 18 for operation with mains power. At least one of the housings or enclosures may be made of a different material, such as synthetic resin, metal, or a composite of these materials. The housing 10 may be subdivided in a manner different from that described above. In addition, for example, one or more of the components or areas may be modified, where appropriate, in terms of the number, material, arrangement, structure, or type.

[0232] Furthermore, the embodiment described above and its modifications can be applied to a jigsaw in which a different cutting tool than the cutting blade 34 is attached.

[0233] Furthermore, the embodiment described above and its modifications can be applied to a reciprocating cutting tool other than the jigsaw, such as a saber saw.

[0234] It is explicitly emphasized that all features disclosed in the description and / or the claims are to be considered separate and independent of one another for the purpose of the original disclosure as well as for the purpose of limiting the claimed invention, irrespective of the combinations of features in the embodiments and / or the claims. It is explicitly stated that all range specifications or specifications of groups of units disclose every possible intermediate value or subgroup of units for the purpose of the original disclosure as well as for the purpose of limiting the claimed invention, in particular also as a boundary of a range specification. Reference symbol list 1 jigsaw 32 cutting blade holders 34 cutting blades 130 first pressed component 132 Sleeve 132C first cam surface (cam surface) 132G Intervention area guidance (recording area) 134 first prestressing component 142 second press component 142F Intervention area 142P pressure range 142T tongue 144 second prestressing component QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2002 - 254 403 A

[0002] JP 2011 - 255 449 A

[0005]

Claims

Reciprocating cutting tool (1), comprising a cutting blade holder (32) to which a cutting blade (34) can be removably attached, wherein the cutting blade holder (32) is reciprocating, and the cutting blade holder (32) comprising a first pressing element (130) that is movable towards or away from the cutting blade (34) for pressing the cutting blade (34), a first preloading element (134) configured to preload the first pressing element (130), a second pressing element (142) configured to press the cutting blade (34) in a direction different from the direction in which the first pressing element (130) presses the cutting blade (34), and a second preloading element (144) configured to preload the second pressing element (142), wherein the first The pressing component (130) automatically presses the cutting blade (34) when the second pressing component (142) is pressed through the cutting blade (34),and the first prestressing component (134) is positioned in such a way that it is avoided being in a direction of movement of the first pressing component (130). Reciprocating cutting tool (1) according to claim 1, wherein the second pressing component (142) is movable in a direction in which the cutting blade holder (32) is movable back and forth, the first pressing component (130) is movable in a direction perpendicular to a direction of movement of the second pressing component (142), and the first preloading component (134) is offset from the first pressing component (130) in the direction in which the cutting blade holder (32) is movable back and forth. Reciprocating cutting tool (1) according to claim 1 or 2, wherein the first preloading component (134) is a torsion spring, and the second pressing component (142) is located radially inwards from the first preloading component (134). Reciprocating cutting tool (1) according to one of claims 1 to 3, wherein the cutting blade holder (32) has a sleeve (132) which is rotatable about a direction in which the cutting blade holder (32) is movable back and forth, and the first pressing component (130) and the first preloading component (134) are located radially inside the sleeve (132). Reciprocating cutting tool (1) according to claim 4, wherein the sleeve (132) has an inner surface having a cam surface (132C), and the first pressing element (130) moves along the cam surface (132C) to move in response to the rotation of the sleeve (132). Reciprocating cutting tool (1) according to claim 4 or 5, wherein the second pressing component (142) extends in the direction in which the cutting blade holder (32) is reciprocable, the second pressing component (142) has an engagement area (142F), the sleeve (132) has a receiving area (132G), and the engagement area (142F) engages with the receiving area (132G) to stop a rotation of the sleeve (132). Reciprocating cutting tool (1) according to claim 6, wherein when the engagement area (142F) is in engagement with the receiving area (132G), the sleeve (132) enables the first pressing element (130) to move to a position in which the first pressing element (130) does not press the cutting blade (34), and when the engagement area (142F) is unlocked from the receiving area (132G), the sleeve (132) causes the first pressing element (130) to move to a position in which the first pressing element (130) presses the cutting blade (34). Reciprocating cutting tool (1) according to claim 6 or 7, wherein the second pressing component (142) has a pressing area (142P), and a tongue (142T) which integrally connects the engagement area (142F) and the pressing area (142P), and when the pressing area (142P) is pressed by the cutting blade (34), the engagement area (142F) moves out of the receiving area (132G). Reciprocating cutting tool (1) according to claim 8, wherein the tongue (142T) and the pressing area (142P) extend in a direction in which the cutting blade holder (32) is reciprocating, and the tongue (142T) is offset from an imaginary center line of the pressing area (142P) in a direction perpendicular to the direction in which the cutting blade holder (32) is reciprocating. Reciprocating cutting tool (1), comprising a cutting blade holder (32) to which a cutting blade (34) can be removably attached, wherein the cutting blade holder (32) is reciprocating, and the cutting blade holder (32) comprises a sleeve (132) rotatable in a direction in which the cutting blade holder (32) is reciprocating, wherein the sleeve (132) has a receiving area (132G), a first pressing element (130) located radially inward from the sleeve (132) and movable in response to a rotation of the sleeve (132), wherein the first pressing element (130) is movable toward or away from the cutting blade (34) to press the cutting blade (34), and a first preloading element (134) located radially inward from the sleeve (132), wherein the first preloading element (134) configured to pre-tension the first pressing component (130), a second pressing component (142) configured to press the cutting blade (34) in the direction,in which the cutting blade holder (32) is reciprocating, in which the second pressing element (142) has an engagement area (142F) that can engage with the receiving area (132G) to stop the rotation of the sleeve (132), a pressing area (142P) that extends in the direction in which the cutting blade holder (32) is reciprocating, and a tongue (142T) that integrally connects the engagement area (142F) and the pressing area (142P) and extends in the direction in which the cutting blade holder (32) is reciprocating, in which the tongue (142T) is offset from an imaginary center line of the pressing area (142P) in a direction perpendicular to the direction in which the cutting blade holder (32) is reciprocating, and a second preloading element (144) that is is configured to pre-tension the second pressing component (142), in which, when the pressing area (142P) is pressed through the cutting blade (34),the intervention area (142F) moves out of the recording area (132G). Reciprocating cutting tool (1) according to one of claims 1 to 10, wherein the cutting blade (34) is attached to the cutting blade holder (32) and has an imaginary center line extending in a direction in which the cutting blade (34) extends, the cutting blade holder (32) has an imaginary center line extending in a direction in which the cutting blade holder (32) extends, and the imaginary center line of the cutting blade (34) attached to the cutting blade holder (32) is offset from the imaginary center line of the cutting blade holder (32) in the direction of the first pressing component (130) in a direction perpendicular to the direction in which the cutting blade holder (32) is reciprocating.

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