Portable processing machine

Abstract

The present invention provides a portable processing machine. In the portable processing machine, a parallel ruler for guiding a tool parallel to the edge of a workpiece can be mounted on a base. In the prior art, when the threaded hole for fixing the parallel ruler is damaged due to chips getting stuck or the like, the entire base needs to be replaced. In the case where the threaded hole is a component independent of the base, the disassembly and assembly of the internal threaded component having the threaded hole are very troublesome. It is necessary to make the assemblability of the internal threaded component good. A leaf spring (41) having a C shape when viewed from the front is elastically embedded in a base portion (36a) of the base (2), thereby holding the internal threaded component (42) on the base portion (36a). By a threaded shaft portion (40a) of an external threaded component (40) fastened to a threaded hole (42a) of the internal threaded component (42), the leg portion entering the holding groove portion (39) is pressed, thereby fixing the parallel ruler. Accordingly, the assemblability and maintainability can be improved.

Description

Technical Field

[0001] The present invention relates to a portable processing machine that performs cutting and other operations by being held and moved by an operator. Background Art

[0002] A parallel ruler is used to guide the moving direction of the portable processing machine parallel to the edge of the workpiece. The parallel ruler is mounted on the base of the portable processing machine. A ruler mounting portion for fixing the legs of the parallel ruler is provided on the base.

[0003] The following structures are disclosed in Patent Document 1: A structure in which an external thread member is fastened in an internal thread portion provided on the base, and its tip portion presses the leg via a sheet metal member to fix the parallel ruler. The following structure is disclosed in Patent Document 2: A structure in which a pressing member is supported rotatably about an axis on the tip of the external thread member, and the pressing member is pressed against the leg by fastening the external thread member to fix the parallel ruler. The following structure is disclosed in Patent Document 3: A structure in which an external thread member is fastened in a highly durable internal thread member mounted on the base, and a pressing member is supported rotatably about an axis on the tip of the external thread portion.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-248740

[0007] Patent Document 2: Japanese Patent Application Laid-Open No. 2017-206003

[0008] Patent Document 3: Japanese Patent Application Laid-Open No. 2018-39100 Summary of the Invention

[0009] [Technical Problems to be Solved by the Invention]

[0010] In the technologies disclosed in Patent Documents 1 and 2, when a foreign object such as machining chips is caught in the two threaded portions provided on the base and the external threaded component is forcibly tightened, the internal threaded portion may be damaged, and thus it may be necessary to replace the base together depending on the situation. This increases the maintenance cost. In the technology disclosed in Patent Document 3, an internal threaded component that is independent of the base and has high durability is used. Therefore, when the internal threaded component is damaged, it is only necessary to remove the internal threaded component from the base and replace it. Accordingly, the maintenance cost can be reduced. However, at the assembly stage of this portable processing machine, in order to prevent the external threaded component from loosening, it is necessary to assemble and install a compression spring and the internal threaded component as an independent component on the base. In this regard, there is a problem that the assembly work is troublesome and time-consuming. This also causes a decrease in maintainability.

[0011] In view of the above situation, regarding the mounting structure of auxiliary tools such as a parallel ruler for a portable processing machine, it is necessary to improve the assemblability and maintainability.

[0012] [Technical Solution for Solving Technical Problems]

[0013] According to a feature of the present invention, a portable processing machine includes a base and a processing machine main body. The base has a lower surface that abuts against a workpiece, and the processing machine main body is supported on the upper surface side of the base. The base has a mounting portion for detachably mounting an auxiliary tool. The mounting portion includes an internal threaded component and an external threaded component. The internal threaded component is detachably held on the base, and the external threaded component is screwed onto the internal threaded component and presses the auxiliary tool against the base by being tightened to the internal threaded component. The internal threaded component or the external threaded component has a loosening prevention structure for preventing the external threaded component from loosening relative to the internal threaded component.

[0014] Therefore, when the internal threaded portion is damaged or the like, it is only necessary to remove the internal threaded portion from the base and replace it. Accordingly, compared with the conventional structure in which the entire base is replaced, the maintenance cost can be reduced. The loosening prevention structure can prevent the external threaded component from loosening. The loosening prevention structure is provided on the internal threaded component itself or the external threaded component itself. Therefore, compared with the conventional structure in which a compression spring or the like that is independent of the internal threaded component or the external threaded component is used to prevent the external threaded component from loosening, the assemblability of the auxiliary tool mounting portion becomes good. For the internal threaded component having the loosening prevention structure, for example, a nylon nut (JIS B1199-1, nylon is a registered trademark) in which a polyamide ring is installed adjacent to the threaded hole, or a lock nut in which a metal ring is installed on the threaded hole can be used. As the loosening prevention structure, for example, a structure in which the thread teeth made of metal are integrally elastically deformed like a Hadlock nut (registered trademark) can be used.

[0015] According to other features of the present invention, the internally threaded member has a through hole. An internal thread portion is formed in a part of the through hole. A loosening prevention structure is provided at a portion of the internally threaded member adjacent to the internal thread portion in the through hole. Therefore, loosening of the external thread portion relative to the internally threaded member can be prevented. Accordingly, by omitting a biasing member such as a compression spring for preventing loosening in the prior art, the assemblability can be improved.

[0016] According to other features of the present invention, there is a leaf spring which is disposed between the external threaded member and the auxiliary device and is configured to transmit the thrust of the external threaded member to the auxiliary device. Therefore, only the axial force of the external threaded member is transmitted to the auxiliary device through the leaf spring, thereby fixing the auxiliary device. In contrast, since the rotational torque of the external thread portion is borne by the leaf spring and is not transmitted to the auxiliary device, displacement of the position of the auxiliary device during tightening of the external threaded member can be prevented.

[0017] According to other features of the present invention, the leaf spring is mounted on the base. The internally threaded member is held on the base by the leaf spring via the external threaded member. Therefore, the internally threaded member can be held on the base with a simple structure, and the ease of disassembling and assembling the internally threaded member can be ensured. In this way, in addition to functioning as an interposed member between the external threaded member and the auxiliary device, the leaf spring can also function to hold the internally threaded member.

[0018] According to other features of the present invention, a portable processing machine has a base and a processing machine main body, wherein the base has a lower surface that abuts against a workpiece; the processing machine main body is supported on the upper surface side of the base. The base has a mounting portion for detachably mounting an auxiliary device. The mounting portion has an internally threaded member and an external threaded member, wherein the internally threaded member is detachably held on the base; the external threaded member is screwed onto the internally threaded member and presses the auxiliary device against the base by being tightened to the internally threaded member. There is a leaf spring which is disposed between the external threaded member and the auxiliary device, is mounted on the base, and holds the internally threaded member on the base via the external threaded member.

[0019] Therefore, in the case where the internal thread portion is damaged or the like, only the internal thread portion can be detached from the base and replaced. Accordingly, compared with the prior structure of replacing the entire base or the like, the maintenance cost can be reduced. By interposing a leaf spring between the external threaded member and the auxiliary device, displacement of the position of the auxiliary device during tightening of the external threaded member can be prevented. In addition, the internally threaded member is held on the base by the leaf spring via the external threaded member. Accordingly, the holding of the internally threaded member can be achieved with a simple structure, and the ease of disassembling and assembling the internally threaded member can be improved. Therefore, the assemblability of the mounting portion of the auxiliary device is improved. In this way, in addition to functioning as an interposed member between the external threaded member and the auxiliary device, the leaf spring can also function to hold the internally threaded member.

[0020] According to other features of the present invention, the leaf spring has a top plate portion and a bottom plate portion. Among them, the top plate portion abuts against the base portion of the base; the bottom plate portion is disposed between the external thread member and the auxiliary appliance. The leaf spring has a connecting portion that connects the top plate portion and the bottom plate portion and allows the bottom plate portion to elastically press the internal thread member against the base portion of the base through the external thread member. Therefore, the installation structure of the leaf spring relative to the base can be simplified, and the ease of disassembly and assembly can be improved.

[0021] According to other features of the present invention, a displacement restricting portion is provided between the leaf spring and the base, and the displacement restricting portion restricts the displacement of the leaf spring in the plane direction orthogonal to the tightening direction of the external thread member. Accordingly, accidental detachment of the leaf spring can be prevented. In addition, when the external thread member is tightened, the rotational torque is borne by the leaf spring, thereby reliably preventing the position deviation of the auxiliary appliance.

[0022] According to other features of the present invention, a recess is provided on the base portion of the base that presses the leaf spring, and the recess allows a tool to be inserted between the base portion and the leaf spring. Therefore, the convenience when detaching the leaf spring from the base portion can be achieved.

[0023] According to other features of the present invention, the leaf spring has a bottom plate portion and a guiding portion. Among them, the bottom plate portion is disposed between the external thread member and the auxiliary appliance; the guiding portion extends obliquely away from the auxiliary appliance from the edge of the bottom plate portion in the installation direction of installing the auxiliary appliance on the base. Therefore, through the guiding portion, the convenience when installing or detaching the auxiliary appliance can be achieved. Description of the Drawings

[0024] Figure 1 is an overall right view of the portable processing machine according to this embodiment.

[0025] Figure 2 is from Figure 1 a top view of the portable processing machine observed in the direction of arrow II in

[0026] Figure 3 is from Figure 2 a left view of the portable processing machine observed in the direction of arrow III in

[0027] Figure 4 is from Figure 3 a front view of the portable processing machine observed in the direction of arrow IV in

[0028] Figure 5 is from Figure 3 a rear view of the portable processing machine observed in the direction of arrow V in

[0029] Figure 6 is from Figure 3An upward view of the portable processing machine as observed in the direction of arrow VI.

[0030] Figure 7 A perspective view of the base and the parallel ruler mounted on the base. The state where the processing machine main body is separated from the base is shown in this figure.

[0031] Figure 8 Is Figure 2 The sectional view taken along VIII-VIII in , and it is a longitudinal sectional view of the parallel ruler and the mounting part.

[0032] Figure 9 The front part of the base, and a perspective exploded view of the mounting part of the parallel ruler.

[0033] Figure 10 A top view of the base part.

[0034] Figure 11 An upward view of the base part.

[0035] Figure 12 A perspective view of a single leaf spring.

[0036] [Description of reference numerals]

[0037] 1: Portable processing machine (portable circular saw); W: Workpiece; 2: Base; 2a: Window portion; 2b: Wall portion (left side); 2c: Wall portion (right side); 2d: Window portion; 3: Vertical swing support shaft; 4: Front support portion; 4a: Fixed operating handle; 4b: Gusset plate; 4c: Tilting bracket; 5: Rear support portion; 5a: Fixed operating handle; 5b: Depth guide; 5c: Tilting support shaft; 5d: Fixed screw; 5e: Knob screw; 6: Left and right tilting support shaft (front side); 7: Left and right tilting support shaft (rear side); 10: Processing machine main body; 11: Reduction gear portion; 11a: Gear housing; 12: Electric motor; 12a: Motor housing; 12b: Air inlet; 12c: Leg; J: Motor axis; 13: Tool; 13a: Spindle; 14: Fixed cover; 15: Movable cover; 16: Tension spring; 17: Controller housing portion; 17a: Controller; 20: Battery pack; 21: Battery mounting portion; 21a: Forked portion; 21b: Holding hole; 22: Hexagonal wrench; 25: Handle portion; 25a: Upright portion; 25b: Gripping portion; 25c: Switch operating handle; 25d: Unlock button; 26: Adapter housing portion; 26a: Communication adapter; 30: Parallel ruler (auxiliary tool); 31: Ruler main body; 32: Leg; 35: Ruler mounting portion; 36: Fixed portion; 36a: Base portion; 36b: Upper surface portion; 36c: Wall portion (left side); 36d: Wall portion (right side); 36e: Holding wall portion (front side); 36f: Holding wall portion (rear side); 36g: Through hole; 36h: Engaging convex portion; 36i: Guide inclined surface; 36j: Concave portion; 36k: Holding hole; 37: Holding portion (left side); 38: Holding portion (right side); 39: Holding groove portion; 40: External thread member; 40a: Threaded shaft portion; 40b: Pinching portion; 41: Leaf spring; 41a: Top plate portion; 41b: Bottom plate portion; 41c: Connecting portion; 41d: Through hole; 41e: Engaging concave portion; 41f: Guide portion; 42: Internal thread member (locknut); 42a: Threaded hole; 42b: Locking member (locking structure). Detailed implementation mode

[0038] Next, according to Figures 1 to 12 to describe the implementation mode of the present invention. In Figures 1 to 6 shows the portable processing machine 1 related to this implementation mode. The portable processing machine 1 is a portable cutting machine called a portable circular saw, and has a base 2 and a processing machine main body 10. Among them, the base 2 has a rectangular flat plate shape and abuts against the upper surface of the workpiece W; the processing machine main body 10 is supported on the upper surface side of the base 2.

[0039] In Figure 1 , 2 the user is located on the left side of the portable processing machine 1, and by moving the portable processing machine 1 in Figure 1 ,2 It moves to the right side, thereby performing cutting processing. In the following description, the direction in which the cutting processing is performed is defined as the front side, and the user side is defined as the rear side to determine the front-rear direction of the components and structures. In addition, the left-right direction is determined based on the user.

[0040] The processing machine main body 10 has a disk-shaped cutting tool 13 called a saw blade that rotates with an electric motor 12 as a drive source. The upper side of the cutting tool 13 is covered by a fixed cover 14. As Figure 2 、 4 、5 shows, an electric motor 12 is arranged on the left side surface of the fixed cover 14 with a reduction gear portion 11 interposed therebetween. The electric motor 12 is installed inside a cylindrical motor housing 12a. The electric motor 12 is installed such that the motor axis (output axis) J is oriented along the left-right direction. The electric motor 12 uses a brushless motor.

[0041] As Figure 3 shows, an air inlet 12b for introducing external air is provided on the left side surface of the motor housing 12a. A cooling fan (not visible in the figure) is installed on the output shaft of the electric motor 12. When the electric motor 12 is started and the cooling fan rotates, external air is introduced into the motor housing 12a from the air inlet 12b, thereby cooling the electric motor 12.

[0042] Legs 12c for tipping and touching the ground are provided on the upper part of the motor housing 12a. In the tipping posture of the portable processing machine 1 with the lower surface of the base 2 facing upward, the portable processing machine 1 can be set in a stable tipping posture by the legs 12c, the upper part of the handle portion 25, and the front corner portion of the base 2 touching the ground. Accordingly, during the intermittent period in the processing operation, the hand can be temporarily released from the portable processing machine 1, and the portable processing machine 1 can be set in a stable posture.

[0043] The reduction gear portion 11 is housed in a gear housing 11a that is also cylindrical. The reduction gear portion 11 uses a gear set in which spur gears are meshed. The rotational output of the electric motor 12 is reduced by the reduction gear portion 11 and output to the main shaft 13a on which the cutting tool 13 is installed. The main shaft 13a projects from the gear housing 11a into the fixed cover 14. The cutting tool 13 is installed at the tip of the main shaft 13a that projects into the fixed cover 14. The cutting tool 13 is fixed to the tip of the main shaft 13a by tightening a fixing screw.

[0044] As Figure 1 、 3, as shown in FIGS. 4 and 5, the lower side of the cutting tool 13 passes through the window portion 2a of the base 2 and protrudes toward the lower surface side. The lower side protruding toward the lower surface side of the base 2 cuts into the workpiece W to perform cutting. The peripheral portion (cutting edge) of the lower side of the cutting tool 13 protruding toward the lower surface side of the base 2 is covered by the movable cover 15. The movable cover 15 is supported by the fixed cover 14 so as to be rotatable about the vicinity of the rotation center (main shaft 13a) of the cutting tool 13. For the movable cover 15, in Figure 1 , if it rotates in the clockwise direction, it is opened, thereby exposing the periphery of the cutting tool 13. For the movable cover 15, in Figure 1 , if it rotates in the counterclockwise direction, it is closed, thereby covering the periphery of the cutting tool 13. As Figure 6 shows, a tension spring 16 is interposed between the movable cover 15 and the fixed cover 14. The movable cover 15 is urged by the tension spring 16 in the closing direction.

[0045] As Figure 3 shows, a controller housing portion 17 is provided behind the motor housing 12a. In the controller housing portion 17, a rectangular flat plate-shaped controller 17a is housed. The operation of the electric motor 12 is controlled by the controller 17a. A control circuit is mounted on the control board of the controller 17a, and this control circuit sends a control signal based on the position information of the rotor detected by the sensor board of the electric motor 12. In addition, a drive circuit is mounted on the control board of the controller 17a, and this drive circuit switches the current of the electric motor 12 according to the control signal received from this control circuit. Moreover, an automatic stop circuit is mounted on the control board, and this automatic stop circuit cuts off the power supply to the electric motor 12 according to the detection result of the state of the battery pack 20 so as not to become an over-discharge or over-current state.

[0046] A battery mounting portion 21 is provided behind the controller housing portion 17. The battery mounting portion 21 has a substantially flat plate shape and is provided in a state of extending horizontally rearward. A rectangular parallelepiped-shaped battery pack 20 is mounted on the lower surface of the battery mounting portion 21. The battery pack 20 is mounted and removed by sliding along the lower surface of the battery mounting portion 21. As Figure 5 shows, the battery pack 20 can be slid to the right to be mounted on the battery mounting portion 21. The battery pack 20 can be slid to the left to be removed from the battery mounting portion 21. The electric motor 12 is started using the electric power of the battery pack 20 as a power source.

[0047] As Figure 2 , 5As shown, a hexagonal wrench 22 can be held in advance on the upper surface of the battery mounting portion 21. One end side of the hexagonal wrench 22 is elastically clamped and held by a bifurcated portion 21a provided on the upper surface of the battery mounting portion 21. The other end side of the hexagonal wrench 22 is inserted into a holding hole 21b provided on the upper surface of the battery mounting portion 21 and held.

[0048] The annular handle portion 25 is provided to straddle between the vicinity of the joint portion of the motor housing 12a and the gear housing 11a and the vicinity of the rear upper surface of the battery mounting portion 21. The handle portion 25 has a standing portion 25a and a gripping portion 25b. The standing portion 25a extends upward from the vicinity of the joint portion of the motor housing 12a and the gear housing 11a. The gripping portion 25b extends backward and downward from the upper portion of the standing portion 25a. The rear portion of the gripping portion 25b is joined to the vicinity of the rear upper surface of the battery mounting portion 21. A trigger-shaped switch operating lever 25c is provided on the lower surface near the joint portion of the standing portion 25a and the gripping portion 25b. The user can hold the gripping portion 25b to move and operate the portable processing machine 1. In addition, by depressing the switch operating lever 25c, the electric motor 12 is started.

[0049] An unlock button 25d is provided above the switch operating lever 25c. The unlock button 25d is configured to protrude from the left and right side surfaces of the handle portion 25. In a state where the unlock button 25d is not pressed, an unlocked state is established in which the depressing operation of the switch operating lever 25c is prohibited. When either side of the unlock button 25d is pressed, the unlocked state is released and the switch operating lever 25c can be depressed. When the depressing operation of the switch operating lever 25c is released, the pressing operation of the unlock button 25d is released and automatically returns to the unlocked state. Through the unlocked state, accidental start-up by the user can be prevented.

[0050] The unlock button 25d has a cylindrical shape that spans the length of the handle portion 25 in the left-right width direction, and its both end portions (operating portions) protrude to the left and right sides of the handle portion 25. Therefore, for the unlock button 25d, the unlocked state can be released by pressing it from either the left or the right side. As Figure 4 、 5 shown, the end portion of the unlock button 25d is formed as an inclined surface that faces obliquely upward. The user can move the unlock button 25d in the left-right direction by bringing the fingertips into contact with the inclined surface and applying a downward pressing force, thereby performing a pressing operation. Thus, the user can easily perform a pressing operation on the unlock button 25d without assuming a constrained posture of the fingertips, and in this regard, good operability of the unlock button 25d can be ensured.

[0051] As Figure 3As shown, an adapter housing portion 26 is provided on the left side of the upright portion 25a of the handle portion 25. In the adapter housing portion 26, a communication adapter 26a for short-range wireless communication is housed. Through the communication adapter 26a, short-range wireless communication can be achieved between this portable processing machine 1 and other wireless devices. Through short-range wireless communication, for example, the start and stop of a dust collector provided nearby can be achieved in linkage with the start and stop operation of this portable processing machine 1. Through this wireless communication function, the operator can continuously and efficiently perform cutting operations while maintaining a clean working environment. The communication adapter 26a can be detached from the adapter housing portion 26. The detached communication adapter 26a can be reused for other power tools with interchangeability.

[0052] The processing machine main body 10 is supported on the upper surface of the base 2 by the front support portion 4 and the rear support portion 5. The processing machine main body 10 is supported on the base 2 in a vertically swingable manner by the vertical swing shaft 3 of the front support portion 4. By changing the vertical swing position of the processing machine main body 10 relative to the base 2, the protruding amount of the cutter 13 toward the lower surface side of the base 2 can be changed, and accordingly, the cutting depth into the workpiece W can be adjusted. Figure 1 It shows a state where the processing machine main body 10 is located at the lower movable end relative to the base 2 and the cutting depth is set to the maximum.

[0053] Regarding the vertical swing position of the processing machine main body 10 relative to the base 2, it is fixed by rotating the fixed operation handle 5a of the rear support portion 5 to the fixed side. The rear support portion 5 has an arc-shaped depth guide member 5b provided on the upper surface of the base 2. The depth guide member 5b is supported in a swingable manner back and forth by the swing shaft 5c. A fixing screw 5d is coupled to the fixed operation handle 5a. The fixing screw 5d penetrates through the guide groove of the depth guide member 5b and is screwed into the left side portion of the fixed cover 14. By tilting the fixed operation handle 5a downward, the fixing screw 5d is tightened, and by tilting it upward, the fixing screw 5d is loosened. By tilting the fixed operation handle 5a downward to tighten the fixing screw 5d, the depth guide member 5b is clamped accordingly. Thereby, the vertical swing position of the processing machine main body 10 relative to the base 2 is fixed, and the cutting depth is fixed. By tilting the fixed operation handle 5a upward to loosen the fixing screw 5d, the vertical swing position of the processing machine main body 10 can be changed to adjust the cutting depth.

[0054] The processing machine main body 10 is supported on the base 2 in a left-right swingable manner by the front and rear left-right swing shafts 6, 7. The front left-right swing shaft 6 is shown in Figure 4 and the rear left-right swing shaft 7 is shown in Figure 5As shown in the figure. The left and right tilting support shafts 6 and 7 at the front and rear are arranged coaxially with each other. The left and right tilting positions of the machine body 10 of the processing machine are adjusted by the left and right tilting support shafts 6 and 7, so that the cutting tool 13 can obliquely cut into the workpiece W for inclined cutting.

[0055] For the left and right tilting positions or the right-angle cutting position of the machine body 10 of the processing machine, fixing is performed by tightening the fixing operation handle 4a of the front support portion 4 and the knob screw 5e of the rear support portion 5. By loosening the fixing operation handle 4a and the knob screw 5e, the machine body 10 of the processing machine can be tilted left and right. As Figures 1 to 4 shown, an arc-shaped gusset plate 4b is erected on the upper surface of the front portion of the base 2. The tilting bracket 4c is supported along the rear surface of the gusset plate 4b. The tilting bracket 4c is coupled to the gusset plate 4b in a left and right tilting manner through the left and right tilting support shafts 6 on the front side. By tightening the fixing operation handle 4a, the left and right tilting positions of the tilting bracket 4c are fixed. The front portion of the machine body 10 of the processing machine is coupled to the tilting bracket 4c through the up and down swinging support shaft 3.

[0056] As Figures 2 to 6 shown, an auxiliary tool can be installed on the front portion of the base 2. In the present embodiment, as shown in the figure, a parallel ruler 30 is illustrated as an auxiliary tool. The parallel ruler 30 functions as a guide for making the cutting tool 13 cut into the side portion of the workpiece W in parallel. The parallel ruler 30 has a flat plate-shaped ruler body 31 that abuts against the side portion of the workpiece W and one leg portion 32 that extends long in the left and right directions from the ruler body 31. By fixing the leg portion 32 to the base 2, the position of the ruler body 31 relative to the cutting tool 13 is fixed.

[0057] The parallel ruler 30 is installed on a ruler mounting portion 35 provided on the front portion of the base 2. Details of the ruler mounting portion 35 are shown in Figure 7 、 8 shown. The ruler mounting portion 35 has a fixing portion 36 and left and right holding portions 37, 38. The left and right holding portions 37, 38 are provided on the left and right side portions of the base 2. On the left and right side portions of the base 2, wall portions 2b, 2c are respectively provided in a shape of being folded back upward. The left and right wall portions 2b, 2c mainly function as ribs for improving the surface rigidity of the base 2. One holding portion 37, 38 is respectively provided on the left and right wall portions 2b, 2c.

[0058] The holding portion 37 provided on the left wall portion 2b has a groove shape with a rectangular cross-section that opens upward. The holding portion 38 provided on the right wall portion 2c has a shape of a rectangular through-hole. The leg portion 32 of the parallel ruler 30 is supported across the left and right holding portions 37, 38. As Figure 7 shown, a holding groove portion 39 for accommodating the leg portion 32 without shaking is provided between the left holding portion 37 and the right holding portion 38.

[0059] The fixing portion 36 is disposed adjacent to the right side of the holding portion 37 on the left side. Details of the fixing portion 36 are as Figure 8 , 9 shown. The fixing portion 36 has a base portion 36a that extends across the holding groove portion 39 in the front-rear direction. The base portion 36a is integrally formed with the base 2 by die-casting aluminum. The base portion 36a has an upper surface portion 36b with a flat upper surface and left and right wall portions 36c, 36d that extend downward from the left and right edge portions of the upper surface portion 36b. The base portion 36a is disposed at a position displaced upward from the holding groove portion 39 so that the legs 32 of the parallel rule 30 can be inserted below the left and right wall portions 36c, 36d.

[0060] As Figure 9 , 10 shown, holding wall portions 36e, 36f are provided at the front and rear of the upper surface portion 36b. The front and rear holding wall portions 36e, 36f are respectively provided along the front and rear edge portions of the upper surface portion 36b. The front and rear holding wall portions 36e, 36f are arranged in parallel with a constant interval therebetween. A circular through-hole 36g is provided at the center of the upper surface portion 36b.

[0061] A latching convex portion 36h is provided on the right side of the through-hole 36g. A guiding inclined surface 36i that slopes downward as it approaches the through-hole 36g side is provided on the left portion of the latching convex portion 36h. A rectangular recess 36j is provided on the right side of the latching convex portion 36h and at the right edge of the upper surface portion 36b. Details of the through-hole 36g, the latching convex portion 36h, and the recess 36j will be described later.

[0062] A rectangular window portion 2d is provided below the upper surface portion 36b. Therefore, as Figure 11 shown, in a state where the parallel rule 30 is removed, the lower surface side of the upper surface portion 36b is exposed to the lower surface side of the base 2 through the window portion 2d. As Figure 11 shown, a hexagonal holding hole 36k is provided on the lower surface of the upper surface portion 36b. The holding hole 36k opens downward. The holding hole 36k is provided coaxially with the through-hole 36g.

[0063] As Figure 8 , 9 shown, in addition to the above-described base portion 36a, the fixing portion 36 further includes an external thread member 40, a leaf spring 41, and an internal thread member 42. The external thread member 40 has a threaded shaft portion 40a and a gripping portion 40b. The threaded shaft portion 40a is inserted through the through-hole 36g of the upper surface portion 36b from above.

[0064] Details of the leaf spring 41 are in Figure 9 , 12Shown in. The leaf spring 41 has a top plate portion 41a, a bottom plate portion 41b, and a connecting portion 41c. Among them, the top plate portion 41a abuts along the upper surface side (upper surface portion 36b side) of the base portion 36a; the bottom plate portion 41b is arranged along the lower surface of the base portion 36a; the connecting portion 41c connects the top plate portion 41a and the bottom plate portion 41b. The left end portion of the top plate portion 41a and the left end portion of the bottom plate portion 41b are connected by the connecting portion 41c, and the leaf spring 41 has a C shape when viewed from the front.

[0065] A circular through-hole 41d is provided at the center of the top plate portion 41a. The through-hole 41d is formed with a diameter slightly larger than that of the through-hole 36g of the base portion 36a. In a state where the leaf spring 41 is mounted on the base portion 36a, the through-hole 41d and the through-hole 36g of the base portion 36a are coaxial, so that the threaded shaft portion 40a of the external thread member 40 is inserted therethrough.

[0066] At the right part of the through-hole 41d, a rectangular engaging recess 41e is cut and formed. In a state where the leaf spring 41 is mounted on the base portion 36a, the engaging convex portion 36h of the base portion 36a enters the engaging recess 41e. Accordingly, it is possible to prevent the positional deviation and detachment with respect to the base portion 36a due to the shaking of the leaf spring 41 or the like. Therefore, the engaging convex portion 36h functions as a displacement restricting portion that restricts the displacement in the surface direction (the surface direction of the upper surface portion 36b) of the leaf spring 41.

[0067] A guiding portion 41f that slopes upward with a constant width as it approaches the upper side is provided at the top end portion of the bottom plate portion 41b. When the leg portion 32 enters the holding groove portion 39 in order to mount the parallel ruler 30, the top end portion of the leg portion 32 is guided to the lower surface side of the bottom plate portion 41b through the guiding portion 41f. Accordingly, the convenience during the installation of the parallel ruler 30 can be achieved.

[0068] The internal thread member 42 uses a hexagon nut. The internal thread member 42 uses a lock nut (nylon nut: JIS B1199-1) in which a polyamide-based ring (lock prevention member 42b) as a resin member is provided in a circular ring-shaped groove at the edge of the threaded hole 42a. The internal thread member 42 is housed in the holding hole 36k of the base portion 36a. The lock prevention member 42b corresponds to a lock prevention structure.

[0069] As Figure 9As shown, before installing the leaf spring 41 on the base portion 36a, the internal threaded member 42 is first received in the holding hole 36k of the base portion 36a. The internal threaded member 42 can pass through the window portion 2d of the base 2 and be received in the holding hole 36k of the base portion 36a. In the state of being received in the holding hole 36k, the threaded hole 42a of the internal threaded member 42 and the through hole 36g of the base portion 36a are located in a substantially coaxial position. While maintaining the received state of the internal threaded member 42, the leaf spring 41 is installed on the base portion 36a from the left side. By making the opening side of the leaf spring 41 opposite to the connecting portion 41c face the base portion 36a and moving it to the right, the leaf spring 41 is installed on the base portion 36a.

[0070] When the leaf spring 41 is installed on the base portion 36a, the top plate portion 41a is disposed along the upper surface portion 36b of the base portion 36a, and the bottom plate portion 41b is disposed along the lower surface side of the base portion 36a. The leaf spring 41 is installed in such a manner that it elastically clamps the base portion 36a through the top plate portion 41a and the bottom plate portion 41b.

[0071] In the state after the leaf spring 41 is installed, its top plate portion 41a is elastically pressed by the upper surface portion 36b of the base portion 36a. As Figure 7 、 8 shown, the top plate portion 41a of the leaf spring 41 is snugly fitted between the front and rear holding wall portions 36e, 36f and is pressed by the upper surface portion 36b. Similar to the engaging convex portion 36h, the front and rear holding wall portions 36e, 36f function as displacement restricting portions that restrict displacement in the surface direction (the surface direction of the upper surface portion 36b) of the leaf spring 41. In addition, the through hole 41d of the leaf spring 41 and the through hole 36g of the base portion 36a are substantially coaxially aligned. Moreover, the engaging convex portion 36h of the base portion 36a is inserted into the engaging concave portion 41e of the leaf spring 41, thereby preventing the top plate portion 41a and even the leaf spring 41 from accidentally falling off the base portion 36a.

[0072] At the stage when the leaf spring 41 is installed on the base portion 36a, the tip of the top plate portion 41a is guided by the guiding inclined surface 36i of the upper surface portion 36b. Accordingly, the engaging convex portion 36h is smoothly inserted and positioned within the engaging concave portion 41e of the top plate portion 41a.

[0073] As Figure 8 shown, when the leaf spring 41 is installed, the tip portion of its top plate portion 41a is disposed so as to cover the concave portion 36j of the base portion 36a. Therefore, the tip portion of a tool such as a flat-blade screwdriver can be inserted into the concave portion 36j, and the top plate portion 41a can be easily lifted from the upper surface portion 36b. By lifting the top plate portion 41a from the upper surface portion 36b, the engaging state of the engaging convex portion 36h with respect to the engaging concave portion 41e of the leaf spring 41 can be easily released. Accordingly, the convenience when removing the leaf spring 41 from the base portion 36a can be achieved.

[0074] The bottom plate portion 41b is disposed along the lower surface side of the base portion 36a by being mounted via the leaf spring 41, whereby the holding hole 36k is blocked by the bottom plate portion 41b. Thus, the internal thread member 42 is held in a state of being housed in the holding hole 36k.

[0075] In a state where the leaf spring 41 is mounted on the base portion 36a, the connecting portion 41c abuts against the left wall portion 36c of the base portion 36a. Accordingly, positioning of the leaf spring 41 with respect to the base portion 36a toward the right (mounting direction) is achieved. For positioning of the leaf spring 41 with respect to the base portion 36a toward the left (removing direction), as described above, it is achieved by fitting the engaging convex portion 36h into the engaging concave portion 41e.

[0076] In a state where the leaf spring 41 and the internal thread member 42 are mounted on the base portion 36a, the threaded shaft portion 40a of the external thread member 40 passes through the through hole 41d of the leaf spring 41 and the through hole 36g of the base portion 36a, and is fastened to the threaded hole 42a of the internal thread member 42. As Figure 8 shown, the tip portion of the fastened threaded shaft portion 40a protrudes from the threaded hole 42a of the internal thread member 42 and abuts against the bottom plate portion 41b of the leaf spring 41.

[0077] When the external thread member 40 is sufficiently fastened to the internal thread member 42, the tip portion of the threaded shaft portion 40a presses against the leg portion 32 of the parallel ruler 30 via the bottom plate portion 41b of the leaf spring 41. Accordingly, the parallel ruler 30 is mounted in a non-movable manner. In addition, the anti-loosening member 42b provided at the mouth edge of the threaded hole 42a is pressed against the threaded shaft portion 40a. Accordingly, loosening of the external thread member 40 with respect to the internal thread member 42 can be prevented.

[0078] According to the portable processing machine 1 configured as described above, the internal thread member 42 for fastening the external thread member 40 is mounted independently of the base 2. Therefore, for example, in a case where the internal thread member 42 is damaged due to being caught by machining chips or the like, the internal thread member 42 can be removed from the base 2 and replaced only. Accordingly, compared with the conventional structure in which the entire base is replaced or the like, the maintenance cost can be reduced.

[0079] In addition, the internal thread member 42 uses a lock nut provided with a polyamide anti-loosening member 42b at the mouth edge of the threaded hole 42a. Since prevention of loosening of the external thread member 40 is achieved by the lock nut, a compression spring for anti-loosening in the prior art can be omitted. Accordingly, the assemblability and maintainability of the fixing portion 36 are improved.

[0080] Regarding the anti-loosening structure used in place of the compression spring in the prior art, various anti-loosening structures can be used to replace the polyamide anti-loosening member 42b provided at the edge of the threaded hole 42a of the internal threaded member 42. For example, an anti-loosening member can also be coated on the threaded shaft portion 40a of the external threaded member 40 (a method is known in which resin is atomized and sprayed on the threaded portion of the external thread, and the resin is cured in an elastic state). In addition, an anti-loosening nut (lock nut) with a metal ring installed at the edge of the threaded hole of the internal threaded member, or a structure that elastically deforms the metal thread teeth like the Hadlock nut (registered trademark) can also be used. By using these anti-loosening structures, biasing members such as the compression spring used for anti-loosening in the prior art can be omitted. Accordingly, the assemblability and maintainability of the installation portion of the auxiliary device can be improved.

[0081] According to the illustrated scale mounting portion 35, the bottom plate portion 41b of the leaf spring 41 is clamped between the threaded shaft portion 40a of the external threaded member 40 and the leg portion 32. Therefore, the thrust of the external threaded member 40 is transmitted to the leg portion 32 through the bottom plate portion 41b. Thus, the tightening force (rotational torque) of the external threaded member 40 is borne by the bottom plate portion 41b of the leaf spring 41 and is not transmitted to the leg portion 32. Accordingly, it is possible to prevent the positional deviation of the leg portion 32 and even the parallel scale 30 when the external threaded member 40 is tightened.

[0082] The leaf spring 41 is mounted on the base portion 36a provided on the base 2. The internal threaded member 42 is held on the base portion 36a of the base 2 by the bottom plate portion 41b of the leaf spring 41 through the external threaded member 40. Therefore, it is possible to hold the internal threaded member 42 on the base 2 with a simple structure and ensure the ease of disassembling and assembling the internal threaded member 42. In this way, in addition to functioning as an interposed member between the external threaded member 40 and the leg portion 32, the leaf spring 41 can also function as a member for holding the internal threaded member 42.

[0083] The leaf spring 41 has a top plate portion 41a and a bottom plate portion 41b, wherein the top plate portion 41a abuts against the upper surface portion 36b of the base portion 36a; the bottom plate portion 41b is disposed between the external threaded member 40 and the leg portion 32 of the parallel scale 30. The top plate portion 41a and the bottom plate portion 41b are connected by a connecting portion 41c. Due to the elastic force of the leaf spring 41 having a C shape when viewed from the front, the base portion 36a is elastically clamped by the top plate portion 41a and the bottom plate portion 41b, thereby mounting the leaf spring 41 on the base portion 36a. Accordingly, the mounting structure of the leaf spring 41 with respect to the base portion 36a can be simplified and the ease of disassembly and assembly can be improved. In addition, due to the elastic force of the leaf spring 41, the internal threaded member 42 is elastically pressed against the holding hole 36k of the base portion 36a by the bottom plate portion 41b and the external threaded member 40 and is held. Accordingly, the ease of disassembling and assembling the internal threaded member 42 with respect to the base portion 36a can be ensured.

[0084] On the base portion 36a, there are provided engaging convex portions 36h and front and rear holding wall portions 36e, 36f as displacement restricting portions, which restrict the displacement of the leaf spring 41 in the plane direction orthogonal to the tightening direction of the external thread member 40. Accordingly, the displacement of the leaf spring 41 in the plane direction (the plane direction of the upper surface portion 36b) can be restricted, thereby preventing accidental detachment from the base portion 36a.

[0085] In addition, a recess 36j is provided on the upper surface portion 36b of the base portion 36a, and the recess 36j allows a tool such as a flat-blade screwdriver to be inserted between the upper surface portion 36b and the top plate portion 41a of the leaf spring 41. Accordingly, the convenience in removing the leaf spring 41 from the base portion 36a can be achieved.

[0086] Moreover, a guiding portion 41f that slopes upward is provided at the tip of the bottom plate portion 41b of the leaf spring 41. According to this guiding portion 41f, when the leg portion 32 enters the holding groove portion 39, the tip portion of the leg portion 32 is guided by the lower surface side of the bottom plate portion 41b. Accordingly, the convenience in installing the parallel ruler 30 can be achieved.

[0087] Various changes can be made to the embodiments described above. For example, although the structure in which the fixing portion 36 of the ruler mounting portion 35 is disposed adjacent to the holding portion 37 on the left side of the base 2 is illustrated, it may also be a structure disposed adjacent to the center in the left-right width direction of the base 2 or the holding portion 38 on the right side. In addition, the fixing portion 36 is not limited to being provided at one location, and may be provided at multiple locations.

[0088] As a loosening prevention structure of the external thread member 40 with respect to the internal thread member 42, a structure of an existing technique using a compression spring may also be applied. In this case, a compression spring can be interposed between the gripping portion 40b of the external thread member 40 and the upper surface portion 36b of the base portion 36a. Accordingly, the loosening prevention structure such as the polyamide-based loosening prevention member 42b illustrated can be omitted.

[0089] Although the parallel ruler 30 is illustrated as an auxiliary tool of the portable processing machine 1, the illustrated auxiliary tool mounting structure can also be applied when other auxiliary tools such as a long ruler adapter or a split sub-base for trimming are mounted on the base.

[0090] In addition, although the portable cutting machine, which is also called a portable circular saw, is illustrated as the portable processing machine 1, the illustrated auxiliary tool mounting structure can also be applied to other portable processing machines such as a cutting machine, a router, or a band saw. The portable processing machine is not limited to a DC machine powered by a battery pack, and may also be an AC machine powered by commercial AC 100V.

Claims

1. A portable processing machine, characterized in that, It has a base, a processing machine main body, and a mounting portion, wherein, the base has a lower surface that abuts against a workpiece to be processed; the processing machine main body is supported on the upper surface side of the base; the mounting portion is used to detachably mount an auxiliary tool on the base, the mounting portion has an internal thread member, an external thread member, and a leaf spring, wherein, the internal thread member is detachably held on the base; the external thread member is screwed onto the internal thread member, and presses the auxiliary tool onto the base by being fastened to the internal thread member; the leaf spring is disposed between the external thread member and the auxiliary tool, and is mounted on the base, and holds the internal thread member on the base through the external thread member.

2. The portable processing machine according to claim 1, characterized in that, The leaf spring has a top plate portion, a bottom plate portion, and a connecting portion, wherein the top plate portion abuts against the base portion of the base; the bottom plate portion is disposed between the external thread member and the auxiliary tool; the connecting portion connects the top plate portion and the bottom plate portion, and allows the bottom plate portion to elastically press the internal thread member against the base portion of the base through the external thread member.

3. The portable processing machine according to claim 1 or 2, characterized in that, A displacement restricting portion is provided between the leaf spring and the base, and this displacement restricting portion restricts the displacement of the leaf spring in the plane direction orthogonal to the fastening direction of the external thread member.

4. The portable processing machine according to claim 1 or 2, characterized in that, A recess is provided on the base portion of the base that presses the leaf spring, and this recess allows a tool to be inserted between the base portion and the leaf spring.

5. The portable processing machine according to claim 1 or 2, characterized in that, The leaf spring has a bottom plate portion and a guiding portion, wherein the bottom plate portion is disposed between the external thread member and the auxiliary tool; the guiding portion extends obliquely away from the auxiliary tool from the edge of the bottom plate portion in the mounting direction of mounting the auxiliary tool on the base.

Images