Die grinding machine

Abstract

The mold grinding machine comprises a motor, a main shaft, a shell and more than two light-emitting parts, and the main shaft rotates and drives around a driving axis which defines the front-back direction of the mold grinding machine; the shell comprises a motor shell for accommodating the motor, a handle shell which is connected to the rear part of the motor shell and comprises a holding part for being held by a user, and a tool shell for arranging the main shaft and the circuit substrate; the two or more light-emitting parts are assembled on the front surface of the circuit board. When a direction from a cross-sectional center of the gripping portion toward the drive axis is defined as a lower direction in a direction orthogonal to the drive axis, and the front surface is divided into four quadrants by a vertical direction passing through the drive axis and a left-right direction passing through the drive axis and orthogonal to the vertical direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion. The first light emitting part is arranged in a quadrant at the right upper side of the driving axis among the four quadrants; the second light-emitting part is disposed in a quadrant above the left of the drive axis.

Description

Technical Field

[0001] The present invention relates to a die grinder. Background Art

[0002] A mold grinder is known that uses a motor as a driving source, rotates a main shaft by the rotational force generated by the motor, and performs grinding and other operations by rotating a top tool such as a grindstone mounted on the top of the main shaft around the drive axis (for example, Japanese Patent Publication No. 2011-045953). Summary of the Invention

[0003] In operations such as grinding using a die grinder, there is a need for a technology that improves the visibility of the workpiece. In die grinders, the workpiece can be positioned relative to the tip tool in a direction intersecting the drive axis. Therefore, there is a need for a technology that improves the visibility of the workpiece when positioned in a direction intersecting the drive axis.

[0004] The present invention can be implemented in the following manner.

[0005] According to the first embodiment of the present invention, a mold grinder is provided. The mold grinder has a motor, a spindle, a housing, and two or more light-emitting parts. The motor is driven by electricity. The spindle is driven to rotate around a drive axis that defines the front and rear directions of the mold grinder by the power of the motor. The housing includes a motor housing, a handle housing, and a tool housing. The motor housing accommodates the motor. The handle housing is connected to the rear of the motor housing and includes a grip portion configured for a user to grip. The tool housing is used to configure the spindle and the circuit substrate. Two or more light-emitting parts are assembled on the front surface of the circuit substrate. The direction from the cross-sectional center of the grip portion toward the drive axis in a direction orthogonal to the drive axis is defined as a downward direction. When the front surface is divided into four quadrants by the up-down direction passing through the drive axis and the left-right direction passing through the drive axis and orthogonal to the up-down direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

[0006] According to the die grinder of the above aspect, the visibility of the workpiece below the die grinder can be improved.

[0007] According to a second aspect of the present invention, a mold grinder is provided. The mold grinder includes a motor, a spindle, a housing, two or more light-emitting parts, and a battery mounting portion. The motor is driven by electricity supplied by a battery. The spindle is driven to rotate around a drive axis that defines the front-back direction of the mold grinder by the power of the motor. The housing includes a motor housing, a handle housing, and a tool housing. The motor housing accommodates the motor. The handle housing is connected to the rear of the motor housing and includes a grip configured for a user to grip. The tool housing is used to configure the spindle and the circuit substrate. Two or more light-emitting parts are assembled on the front surface of the circuit substrate. The battery mounting portion is capable of detaching and detaching the battery along a detachment direction that intersects the drive axis. The handle housing includes a handle recess, and the outer surface of the handle housing is concave relative to the outer surface of the motor housing to form the handle recess. The direction from the drive axis toward the handle recess along the detachment direction is defined as a downward direction. When the front surface is divided into four quadrants by the up-down direction passing through the drive axis and the left-right direction passing through the drive axis and orthogonal to the up-down direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

[0008] According to the die grinder of the above aspect, the visibility of the workpiece below the die grinder can be improved.

[0009] According to a third aspect of the present invention, a mold grinder is provided. The mold grinder includes a motor, a spindle, a housing, and two or more light-emitting parts. The motor is driven by electricity. The spindle is driven to rotate around a drive axis that defines the front and rear directions of the mold grinder by the power of the motor. The housing includes a motor housing, a handle housing, and a tool housing. The motor housing accommodates the motor. The handle housing is connected to the rear of the motor housing and includes a grip configured for a user to grip. The tool housing is used to configure the spindle and the circuit substrate. Two or more light-emitting parts are assembled on the front surface of the circuit substrate. The position with the largest curvature in the cross-sectional shape of the grip is defined as the top end, and the direction from the cross-sectional center of the grip or the drive axis toward the top end is defined as the downward direction. When the front surface is divided into four quadrants by the up-down direction passing through the drive axis and the left-right direction passing through the drive axis and orthogonal to the up-down direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

[0010] According to the die grinder of the above aspect, the visibility of the workpiece below the die grinder can be improved.

[0011] According to a fourth aspect of the present invention, a mold grinder is provided. The mold grinder includes a motor, a spindle, a housing, two or more light-emitting parts, and an operating part. The motor is driven by electricity. The spindle is driven to rotate around a drive axis that defines the front and rear directions of the mold grinder by the power of the motor. The housing includes a motor housing, a handle housing, and a tool housing. The motor housing accommodates the motor. The handle housing is connected to the rear of the motor housing and includes a gripping part configured for a user to grip. The tool housing is used to configure the spindle and the circuit substrate. Two or more light-emitting parts are assembled on the front surface of the circuit substrate. The operating part is provided in the housing and is used to switch the start and stop (ON / OFF) of the motor. The direction from the cross-sectional center of the gripping part or the drive axis toward the operating part in a direction orthogonal to the drive axis is defined as the upward direction. When the front surface is divided into four quadrants by the up-down direction passing through the drive axis and the left-right direction passing through the drive axis and orthogonal to the up-down direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

[0012] According to the die grinder of the above aspect, the visibility of the workpiece below the die grinder can be improved.

[0013] According to the fifth aspect of the present invention, a mold grinder is provided. The mold grinder has a motor, a spindle, a housing, and two or more light-emitting parts. The motor is driven by electricity. The spindle is driven to rotate around a drive axis that defines the front and rear directions of the mold grinder by the power of the motor. The housing includes a motor housing, a handle housing, and a tool housing. The motor housing accommodates the motor. The handle housing is connected to the rear of the motor housing and includes a gripping portion configured for a user to grip. The tool housing is used to configure the spindle and the circuit substrate. Two or more light-emitting parts are assembled on the front surface of the circuit substrate. An operating portion is provided on the housing for switching the start and stop of the motor. The direction from the cross-sectional center of the gripping portion or the drive axis toward the operating portion in a direction orthogonal to the drive axis is defined as the right direction or the left direction. When the front surface is divided into four quadrants which are orthogonal to the left-right direction and pass through the up-down direction of the drive axis, and the left-right direction of the drive axis, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

[0014] According to the die grinder of the above aspect, the visibility of the workpiece below the die grinder can be improved.

[0015] According to the sixth aspect of the present invention, a mold grinder is provided. The mold grinder includes a motor, a spindle, a housing, two or more light-emitting parts, and a paddle switch. The motor is driven by electricity. The spindle is driven to rotate around a drive axis that defines the front and rear directions of the mold grinder by the power of the motor. The housing includes a motor housing, a handle housing, and a tool housing. The motor housing accommodates the motor. The handle housing is connected to the rear of the motor housing and includes a grip configured for a user to grip. The tool housing is used to configure the spindle and the circuit substrate. Two or more light-emitting parts are assembled on the front surface of the circuit substrate. A paddle switch is provided on the grip portion for switching the start and stop of the motor. The direction from the cross-sectional center of the grip portion toward the paddle switch is defined as the downward direction. When the front surface is divided into four quadrants by the up-down direction passing through the drive axis and the left-right direction passing through the drive axis and orthogonal to the up-down direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

[0016] According to the die grinder of the above aspect, the visibility of the workpiece below the die grinder can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a perspective view showing the external appearance structure of the die grinding machine according to the first embodiment. Figure 2 It is a side view of the die grinding machine according to the first embodiment. Figure 3 yes Figure 2 Cross-sectional view of the III-III position. Figure 4 yes Figure 1 Cross-sectional view of the IV-IV position. Figure 5 It is an explanatory diagram showing the internal structure of the tool housing. Figure 6 It is a three-dimensional exploded view of the lighting device. Figure 7 It is a front view showing the front surface of the circuit board. Figure 8 yes Figure 7 A cross-sectional view of the VIII-VIII position. Figure 9 yes Figure 7 A cross-sectional view of the IX-IX position. Figure 10 It is a front view showing the arrangement structure of the light emitting portion as a comparative example. Figure 11 yes Figure 10 A cross-sectional view of the XI-XI position. Figure 12 yes Figure 10 A cross-sectional view of the XII-XII position. Figure 13 It is an explanatory diagram showing the simulation results of the irradiation range of the lighting device toward the bottom. Figure 14 It is an explanatory diagram showing the simulation results of the appearance of light irradiated by the irradiation device. Figure 15 It is an explanatory diagram showing the simulation results of the irradiation range of the lighting device according to the comparative example directed downward. Figure 16 It is an explanatory diagram showing the simulation results of the appearance of light irradiated by the irradiation device of the comparative example. Figure 17 It is a front view showing the arrangement structure of the light emitting portion as a second comparative example. Figure 18 yes Figure 17 A cross-sectional view of the XVIII-XVIII position. Figure 19 yes Figure 17 Cross-sectional view of the XIX-XIX position. Figure 20 It is an explanatory diagram showing the simulation results of the irradiation range of the lighting device according to the second comparative example in the downward direction. Figure 21 It is an explanatory diagram showing the simulation results of the appearance of light irradiated by the irradiation device of the second comparative example. Figure 22 It is an explanatory diagram showing the structure below the barrel. Figure 23 It is an explanatory diagram showing the structure of the inner peripheral surface of the tool housing. Figure 24 It is an explanatory diagram showing the internal structure below the motor case. Figure 25 This is a second explanatory diagram showing the internal structure below the motor case. Figure 26 This is a first explanatory diagram showing a method of defining directions according to another embodiment. Figure 27 This is a second explanatory diagram showing a method of defining directions according to another embodiment. Figure 28 This is a third explanatory diagram showing a method of defining directions according to another embodiment. Figure 29 This is a fourth explanatory diagram showing a method of defining directions according to another embodiment. Figure 30 This is a fifth explanatory diagram showing a method of defining directions according to another embodiment. Figure 31 This is a sixth explanatory diagram showing a method of defining directions according to another embodiment. Figure 32 It is an explanatory diagram showing the arrangement positions of light emitting units according to other embodiments. [Explanation of Reference Numerals] 10: Controller; 12: Electric wire; 14: Switch; 16: Connector; 20: Motor; 21: Motor body; 22: Motor shaft; 26: Fan; 30: Motor housing; 32: Motor bearing holder; 40: Handle housing; 42: Grip; 44: Handle recess; 46: Battery mounting portion; 50: Tool housing; 52: Recess; 54: Protrusion; 56: Opening; 60: Cylindrical portion; 60R: Rib; 61: First wall portion; 62: Second wall portion; 63: Cylinder Wire circuit of the shape portion; 66: Bearing retainer; 68: Through hole; 70, 70R, 70R2: Circuit board; 72: Front surface; 72CL: Intermediate circle; 72R1, 72R2: Peripheral portion; 80: Light-emitting portion; 81, 81R, 81R2: First light-emitting portion; 82, 82R, 82R2: Second light-emitting portion; 83, 83R, 83R2: Third light-emitting portion; 84: Fourth light-emitting portion; 85: Fifth light-emitting portion; 86: Protective component; 87: Sixth light-emitting portion; 90 : Spindle; 92: Collet cone; 94: Collet nut; 100, 100R, 100R2: Die grinder; 201: Front motor bearing; 202: Rear motor bearing; 204: Coupling; 302: Outer wall; 304: Support wall; 304E: Front end; 306: Motor wiring; 322, 322B: Opening; 601: Front spindle bearing; 602: Rear spindle bearing; 611: First protrusion; 622: Second protrusion; 662: Recess ;860: Main body; 862: Base; 864: Claw; BT: Battery; DL: Lighting device; HS: Shell; HR1, HRR1, HRR3, HZ1, HZ3: Horizontal plane; LR1, LR3, LRR1, LRR3: Light; MX: Motor rotation axis; SD: Shadow; SW1, SW2, SW3: Operating part; SW4: Paddle switch; TP: Top; TS: Side; TT: Top tool; TX: Drive axis; WS: Processing object. DETAILED DESCRIPTION

[0018] Representative and non-limiting examples of the present invention are described in detail below with reference to the accompanying drawings. This detailed description is intended only to provide those skilled in the art with details of preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Furthermore, the additional features and inventions disclosed below may be used alone or in combination with other features and inventions to provide further improved devices, methods of making the same, and methods of using the same.

[0019] In addition, the combinations of features and steps disclosed in the following detailed description are not essential to the broadest sense of the present invention, but are provided solely to illustrate representative embodiments of the present invention. Furthermore, the various features of the representative embodiments described above and below, as well as the various features described in the independent and dependent claims, do not necessarily need to be combined as described in the examples herein, or in the order in which they are listed, to provide additional and useful embodiments of the present invention.

[0020] Except for the structures of features described in the embodiments and / or technical solutions, all features described in this specification and / or technical solutions are intended to be disclosed individually or independently of each other as limitations of the original disclosed and claimed specific matters. Furthermore, the description of all numerical ranges and groups or groups is intended to disclose intermediate structures thereof as specific matters originally disclosed and claimed.

[0021] In one or more embodiments, the two or more light emitting units may further include a third light emitting unit, and the third light emitting unit is arranged below the drive axis on the front surface. According to the die grinder of this aspect, by arranging the light emitting unit below the drive axis, it is possible to suppress the light emitting unit from irradiating light upward and improve the illumination of the workpiece below.

[0022] In one or more embodiments, the front surface may have an annular shape. When a circle connecting an inner peripheral portion and an outer peripheral portion of two peripheral portions of the front surface close to the drive axis is defined as an intermediate circle, the two or more light-emitting portions may be arranged on the front surface in an area inner than the intermediate circle. According to the die grinder of this aspect, the range of light irradiation to the workpiece can be expanded compared to a case where the light emitting portion is arranged in a region outside the intermediate circle.

[0023] In one or more embodiments, the mold grinder may further include a protective member disposed in front of the light-emitting portion to transmit light from the light-emitting portion. The protective member may include a main body, a base, and a claw, wherein the main body covers the light-emitting portion; the base extends rearward from the main body; and the claw is disposed at the top end of the base and is configured to engage with a recess provided in a component positioned rearward of the circuit board. According to the die grinder of this aspect, by using the clip for attaching and detaching the lighting device, the attaching and detaching of the lighting device becomes easy, and the lighting device can be easily repaired.

[0024] In one or more embodiments, the mold grinder may further include a spindle bearing, a cylindrical portion, and a bearing holder, wherein the spindle bearing rotatably supports the spindle; the cylindrical portion houses the spindle bearing; and the bearing holder is disposed in front of the spindle bearing and fixed to the front end of the cylindrical portion. The recess may be provided on an outer surface of the bearing holder. The circuit substrate and the two or more light-emitting units may be held between the bearing holder and the protective component, with the claw and the recess engaged. According to the die grinder of this aspect, compared with a case where the protective member is engaged with the outer peripheral surface of the cylindrical portion or the like, it is possible to suppress an increase in the size of the protective member in the radial direction.

[0025] In one or more embodiments, the mold grinder may include a cylindrical portion that houses at least a portion of the spindle. The cylindrical portion may include a first wall portion and a second wall portion that protrude from an outer surface of the cylindrical portion. Electrical wires connected to the circuit board may be arranged within an electrical wiring path within the cylindrical portion defined by the first wall portion and the second wall portion. According to the die grinder of this aspect, the cylindrical portion can be reinforced by the first wall portion and the second wall portion, and a wiring path for the electric wire can be formed around the cylindrical portion.

[0026] In one or more embodiments, a first protrusion that protrudes toward the second wall portion may be provided on a surface of the first wall portion that faces the second wall portion. A second protrusion that protrudes toward the first wall portion may be provided on a surface of the second wall portion that faces the first wall portion. According to the die grinder of this aspect, it is possible to suppress or prevent the electric wire from falling out of the cylindrical portion electric wire path.

[0027] In one or more embodiments, a recessed portion may be provided on an inner surface of the tool housing, the recessed portion being capable of accommodating the first wall portion and the second wall portion. According to the die grinder of this aspect, it is possible to provide a die grinder in which the tool housing is easy to grip and operability is high.

[0028] In one or more embodiments, the motor housing may include an outer wall portion of the motor housing and a support wall portion inside the motor housing for supporting the motor. A motor wire line for passing the wire may be provided in the motor housing between the support wall portion and the outer wall portion. According to the die grinder of this aspect, it is possible to suppress contact between the electric wires and various parts in the motor case.

[0029] In one or more embodiments, the mold grinder may further include a fan, a motor bearing, and a motor bearing holder. The fan is used to cool the motor. The motor bearing is disposed within the housing between the motor and the spindle and rotatably supports the motor shaft of the motor. The motor bearing holder has an opening that allows airflow from the fan to pass through. The cylindrical portion wiring, the opening, and the motor wiring may be interconnected. According to the die grinder of this aspect, by using the opening as the wiring path for the electric wires, it is possible to suppress or prevent the motor housing from increasing in size in the radial direction, compared with a case where a wiring path is formed that bypasses the motor bearing holder.

[0030] In one or more embodiments, the die grinder may further include a controller configured to control the operation of the die grinder. The controller may be disposed at a position where the drive axis passes. According to the die grinder of this aspect, the radial dimension of the die grinder can be reduced in size.

[0031] In one or more embodiments, the motor may include a motor shaft that is driven to rotate about a motor rotation axis. The motor rotation axis and the drive axis may be coaxial. According to the die grinder of this aspect, the radial dimension of the die grinder can be reduced in size.

[0032] In one or more embodiments, the die grinder may further include a battery and a battery mounting portion, wherein the battery is used to supply power to the motor; and the battery mounting portion is detachable.

[0033] A. First embodiment: A1. Appearance and structure of mold grinding machine 100: like Figure 1 As shown, the mold grinder 100 is an example of an electric tool having a total length of about 400 mm in the front-to-back direction. The mold grinder 100 rotates the spindle 90 around the drive axis TX by the rotational force generated by the drive of the motor 20 described later. The top tool TT is mounted on the top of the spindle 90 and rotates by the rotation of the spindle 90. Figure 1 In the example of FIG, the tip tool TT is a substantially cylindrical shaft grindstone with the side surface TS serving as a grinding surface. The user, for example, operates the die grinder 100 to rotate the tip tool TT and press the side surface TS against the workpiece to perform grinding or the like.

[0034] The tip tool TT is not limited to a cylindrical shape and can be switched to various shapes, including a cone or a conical shape, to suit the workpiece. Furthermore, the tip tool TT can also be a tool other than a grindstone, such as a flap grinding wheel with sandpaper attached. The mold grinder 100 is sometimes also referred to as a "manual grinder" or "straight grinder."

[0035] For ease of explanation, in this specification, the direction in which the drive axis TX extends is defined as the "front-back direction of the die grinder 100." In the front-back direction, the end of the housing HS where the spindle 90 is located is defined as the "front side of the die grinder 100," and the opposite end is defined as the "rear side of the die grinder 100." The definitions of the up-down direction and the left-right and rear directions will be described later.

[0036] The die grinder 100 includes a housing HS having a substantially cylindrical shape extending in the front-rear direction. The housing HS includes a motor housing 30, a handle housing 40, and a tool housing 50. The motor housing 30 houses the motor 20.

[0037] The handle housing 40 is connected to the rear of the motor housing 30. The handle housing 40 includes a grip portion 42, a handle recess 44, and a battery mounting portion 46 for mounting a battery BT (see FIG. Figure 4 ).

[0038] The grip portion 42 is configured to be gripped by the user. The grip portion 42 has a cross-sectional width smaller than that of the motor housing 30 and is configured to have a width and cross-sectional shape that is easily gripped by the user. In this embodiment, the grip portion 42 is coated with a material such as an insulating elastomer.

[0039] exist Figure 2 and Figure 3 The cross-sectional center HX of the grip portion 42 is shown in FIG. Figure 3 As shown, the so-called "cross-sectional center HX of the gripping portion 42" refers to the graphic center of the outer shape of the cross-sectional shape of the gripping portion 42. The cross-sectional center HX of the gripping portion 42 can also be defined using the center of gravity of the cross section of the gripping portion 42. In the mold grinder 100 of this embodiment, the direction DD1 from the cross-sectional center HX of the gripping portion 42 toward the drive axis TX in the direction perpendicular to the drive axis TX is defined as the downward direction, and the opposite direction is defined as the upward direction. In addition, the direction perpendicular to the front-back direction and the up-down direction is defined as the left-right direction. In addition, the downward direction can be a direction that facilitates the movement of the mold grinder 100 toward the processing object when the mold grinder 100 is used to process the processing object.

[0040] in addition, Figure 2The straight line HL shown in FIG. 1 represents the position of the cross-sectional center HX in the front-back direction of the grip portion 42. The straight line HL is, for example, a regression line calculated by the least square method using a plurality of cross-sectional centers HX in the front-back direction. Figure 2 As shown, in the mold grinding machine 100 of this embodiment, the straight line HL extends over the entire front-to-back length of the gripping portion 42, is positioned above the drive axis TX, and the cross-sectional center HX is positioned above the drive axis TX at any position in the front-to-back direction of the gripping portion 42. Furthermore, even when the straight line HL intersects the drive axis TX at any position in the front-to-back direction of the gripping portion 42, the vertical direction may be defined using methods such as those described in other embodiments below.

[0041] like Figure 1 、 Figure 2 As shown, the upper end of the grip portion 42 is configured to be substantially coplanar with the upper end of the motor housing 30. Therefore, the outer surface of the lower side of the handle housing 40 has an appearance that is concave upward relative to the outer surface of the lower side of the motor housing 30 and the outer surface of the lower side of the rear end of the handle housing 40. This concave portion of the lower side of the handle housing 40 is also referred to as the "handle recess 44."

[0042] like Figure 1 As shown, the tool housing 50 is connected to the front of the motor housing 30. The tool housing 50 houses the spindle 90, the lighting device DL, and other components. The cross-sectional width of the tool housing 50 is smaller than that of the motor housing 30, resulting in a width and shape that are convenient for the user to grip. In this embodiment, the tool housing 50 is covered with a material such as an insulating elastomer. For example, the user can use the die grinder 100 by gripping the grip portion 42 of the handle housing 40 with one hand and the tool housing 50 with the other.

[0043] The lighting device DL is configured to illuminate a working area including the object to be processed or its surroundings. The lighting device DL can improve visibility of the object to be processed. In this embodiment, the lighting device DL is disposed at the front end of the tool housing 50 .

[0044] A2. Internal structure of the mold grinder 100: like Figure 4 As shown on the left side of the figure, the handle housing 40 houses a controller 10 and a switch 14. The controller 10 is composed of a computer having a CPU as a central processing unit and memories such as RAM and ROM. The controller 10 controls various operations in the mold grinding machine 100, such as driving the motor 20.

[0045] The controller 10 is positioned where the drive axis TX passes. This configuration allows for miniaturization of the radial dimensions of the housing HS. Furthermore, the controller 10 has a generally flat plate shape and is positioned at the rear end of the handle housing 40 so that its surface intersects the drive axis TX. Accommodating the controller 10 at the rear end of the handle housing 40, where space is more readily available than in the motor housing 30 or tool housing 50, allows for efficient arrangement of the various components within the housing HS.

[0046] In this embodiment, a battery mounting portion 46 configured to house a detachable battery BT is provided at the rear end of the handle housing 40. The battery mounting portion 46 is located at the rear end of the handle housing 40 where the drive axis TX passes. The battery BT is, for example, a well-known secondary battery such as a lithium-ion battery comprising multiple cells.

[0047] exist Figure 4 In the example, the installation and removal direction DB of the battery BT is a direction perpendicular to the drive axis TX, and in this embodiment, it is consistent with the up-down direction. The user can remove the battery BT from the battery mounting portion 46 by pulling the battery BT upward along the installation and removal direction DB. In addition, the user can install the battery BT on the battery mounting portion 46 by pressing the battery BT downward along the installation and removal direction DB. The battery BT installed in the battery mounting portion 46 can supply power to the motor 20, the lighting device DL, the controller 10, etc. In addition, the battery BT is electrically connected to the circuit substrate 70 through the wires 12 wired in the housing HS, and supplies power to the lighting device DL.

[0048] like Figure 4 As shown in the center of the figure, a motor housing 30 houses a motor 20 and other components. The motor 20 is a brushless DC motor driven under the control of the controller 10. The motor 20 includes a motor body 21 including a stator and a rotor, a motor shaft 22, and a fan 26 mounted on the motor shaft 22. The fan 26 rotates together with the motor shaft 22. The fan 26 generates airflow for cooling the motor 20.

[0049] The motor shaft 22 is rotatably supported in the motor housing 30 by a front motor bearing 201 and a rear motor bearing 202 provided in the motor housing 30. The motor shaft 22 rotates together with the rotor around the motor rotation axis MX. In the present embodiment, the motor shaft 22 is connected to the main shaft 90 by a coupling 204, and is configured so that the motor rotation axis MX and the drive axis TX are coaxial. However, the motor rotation axis MX and the drive axis TX may not be coaxial, for example, they may be configured so that they are close to each other and parallel to each other to the extent that the drive axis TX passes through the motor body 21. By arranging the motor rotation axis MX and the drive axis TX of the motor 20 close to each other, the radial dimension of the mold grinding machine 100 can be miniaturized.

[0050] The front motor bearing 201 is supported in the motor housing 30 in a state where its movement is restricted by the motor bearing holder 32. The motor bearing holder 32 has an opening 322 formed therein, which functions as a vent for allowing airflow from the fan 26 to pass therethrough.

[0051] like Figure 5 As shown, the tool housing 50 houses a cylindrical portion 60 and a lighting device DL. The cylindrical portion 60 houses the spindle 90 and the like. The spindle 90 is rotatably supported by the cylindrical portion 60 via a front spindle bearing 601 and a rear spindle bearing 602 held within the cylindrical portion 60. The front spindle bearing 601 is secured by a bearing holder 66 to restrict its movement in the front-to-back direction. A collet cone 92 and a collet nut 94 for securing the top tool TT are provided at the front end of the spindle 90. By tightening the collet nut 94, the top tool TT, which is inserted into the collet cone 92, is fixed to the spindle 90 in a non-rotatable manner.

[0052] like Figure 4 As shown in FIG. 1 , in this embodiment, an operating unit SW1 for switching the start and stop of the motor 20 is provided above the motor housing 30. Figure 4 In this example, the operating unit SW1 is a slide switch. Operating the slide switch switches the switch 14 on and off, thereby switching the motor 20 on and off. The operating unit SW1 is not limited to a slide switch; various switches such as a touch sensor may also be used. When the motor 20 is started by operating the operating unit SW1, the motor shaft 22 is driven, and the spindle 90 and the tip tool TT rotate integrally with the motor shaft 22 via the coupling 204.

[0053] like Figure 4 As shown on the right side of the tool housing 50, the lighting device DL is disposed at the front end of the housing HS. Specifically, within the tool housing 50, the lighting device DL is disposed between the front end of the cylindrical portion 60 and the front end of the tool housing 50. In this embodiment, the lighting device DL is configured to appropriately illuminate the workpiece WS disposed below the die grinder 100 with light LT.

[0054] like Figure 5 As shown, the lighting device DL includes a light-emitting unit 80, a protective member 86, and a circuit board 70. The light-emitting unit 80 is an LED light source powered by a battery BT. The light-emitting unit 80 is covered with a protective member 86 formed of a transparent resin. The protective member 86 transmits light emitted from the light-emitting unit 80. If the protective member 86 does not have the claw portion 864 described later, for example, the protective member 86 can be made of glass.

[0055] The circuit board 70 is a so-called LED board, with light-emitting units 80 mounted on its front surface 72. The circuit board 70 is connected to an electric wire 12 for supplying power from the battery BT. The front surface 72 of the circuit board 70 has an opening in the center through which the main shaft 90 can be inserted, and is annular in shape, surrounding the drive axis TX. In this embodiment, three light-emitting units 80 are mounted on the circuit board 70. The arrangement of the light-emitting units 80 will be described later.

[0056] In this embodiment, the on / off operation of the operating portion SW1 is linked to the start / stop of the light emitting unit 80. Light LT emitted from the lighting device DL is irradiated toward the workpiece WS through the opening 56 formed at the front end of the tool housing 50.

[0057] A3. Assembly method of lighting device DL: Reference Figure 6 The method of assembling the lighting device DL etc. to the cylindrical portion 60 etc. is described. Figure 6 In order to facilitate technical understanding, some parts such as the main shaft 90 are omitted from the figure. First, the main shaft 90 with the front side main shaft bearing 601 mounted thereon is inserted into the cylindrical portion 60 from the front end thereof.

[0058] Next, the front spindle bearing 601 is fixed to the cylindrical portion 60 by attaching the bearing holder 66 to the front end of the cylindrical portion 60. An external thread (not shown) is formed on the outer circumferential surface of the bearing holder 66. The external thread of the bearing holder 66 screws into an internal thread (not shown) formed on the inner circumferential surface of the front end of the cylindrical portion 60. When the bearing holder 66 is screwed into the front end of the cylindrical portion 60, the bearing holder 66 is fixed to the front end of the cylindrical portion 60 in a manner that restricts the movement of the front spindle bearing 601 in the front-to-back direction. In addition to the external thread, the outer circumferential surface of the bearing holder 66 also has a recessed portion 662 having a shape corresponding to the claw portion 864.

[0059] Next, the protective member 86 is fixed to the bearing holder 66. In this embodiment, the protective member 86 can be fixed to the bearing holder 66 using a so-called snap-fit. The use of snaps facilitates attachment and detachment of the protective member 86, making it easy to repair the lighting device DL.

[0060] The circuit substrate 70, with the light-emitting unit 80 mounted thereon, is fixed to the protective member 86 by an adhesive or the like. The protective member 86 includes a substantially annular main body 860 that covers the front surface 72 of the circuit substrate 70, a base 862 that protrudes rearward from the outer edge of the main body 860, and a claw 864 formed at the tip of the base 862. The claw 864 protrudes radially inward from the outer edge of the main body 860.

[0061] The protective member 86 is made of a resilient transparent resin. Therefore, when the protective member 86 is moved rearwardly toward the bearing holder 66, the claws 864 contact the outer peripheral surface of the bearing holder 66 and, receiving a reaction force from the outer peripheral surface, bend away from the bearing holder 66. As the protective member 86 is further moved toward the bearing holder 66, the claws 864 are released from the reaction force from the outer peripheral surface and engage with the recesses 662 of the bearing holder 66.

[0062] In this embodiment, the protective member 86 is fixed to the bearing holder 66. Therefore, compared with a case where the protective member 86 is engaged with the outer peripheral surface of the cylindrical portion 60, the protective member 86 can be suppressed from increasing in size in the radial direction, thereby suppressing or preventing the tool housing 50 from increasing in size in the radial direction.

[0063] When the protective member 86 is fixed to the bearing holder 66, the protective member 86 and the circuit board 70 are held between the bearing holder 66 and the protective member 86 with the claws 864 and recesses 662 engaged. As a result, the lighting device DL is fixed to the bearing holder 66 and the cylindrical portion 60.

[0064] When the spindle 90, the bearing holder 66, the protective member 86, etc. are fixed to the cylindrical portion 60, the tool housing 50 is mounted on the outer periphery of the cylindrical portion 60. Figure 5 As shown, the protective member 86 is fixed so that its front-to-back movement is restricted by the inner circumferential surface of the protrusion 54 while being exposed to the outside through the opening 56 at the front end of the tool housing 50. The protrusion 54 is a portion that protrudes radially inward from the front end of the tool housing 50 and defines the opening 56.

[0065] The lighting device DL is fixed forward of the front end of the cylindrical portion 60. Therefore, compared to a structure in which the lighting device DL is housed within the cylindrical portion 60 or a structure in which the protective member 86 engages with the inner circumferential surface of the cylindrical portion 60, the protective member 86 can be easily attached and detached, allowing for easy repair of the lighting device DL. However, the mold grinder 100 is not limited to these structures. For example, the recess 662 may be formed on a component other than the bearing retainer 66, such as the inner circumferential surface of the cylindrical portion 60 or the outer circumferential surface of the cylindrical portion 60. Furthermore, when the recess 662 is formed on the inner circumferential surface of the cylindrical portion 60, the claw portion 864 is configured to protrude radially outward from the base portion 862.

[0066] A4. Configuration structure of the light emitting portion 80 on the circuit substrate 70: Reference Figures 7 to 21 The configuration position of the light emitting portion 80 on the circuit substrate 70 will be described. Figure 7As shown, the front surface 72 of the circuit substrate 70 is divided into four quadrants by the vertical direction D1 passing through the drive axis TX and the horizontal direction D2 passing through the drive axis TX and perpendicular to the vertical direction D1. Specifically, the upper right of the drive axis TX is defined as the first quadrant Q1, the upper left of the drive axis TX is defined as the second quadrant Q2, the lower left of the drive axis TX is defined as the third quadrant Q3, and the lower right of the drive axis TX is defined as the fourth quadrant Q4. The light-emitting unit 80 includes at least a first light-emitting unit 81 arranged in the first quadrant Q1 and a second light-emitting unit 82 arranged in the second quadrant Q2. In addition, the first light-emitting unit 81 and the second light-emitting unit 82 are arranged at an elevation angle of 30 degrees relative to the horizontal direction D2.

[0067] exist Figure 8 The simulation result of the light irradiation range of the first light emitting unit 81 is schematically shown in FIG. In addition, the simulation result of the light irradiation range of the second light emitting unit 82 is the same as that of the first light emitting unit 81, so the description is omitted. Figure 8 As shown, the light emitted by the first light emitting section 81 is irradiated to the outside of the die grinding machine 100 through the opening 56 at the front end of the tool housing 50. Therefore, the light irradiation range of the first light emitting section 81 can be defined by the protrusion 54 at the front end of the tool housing 50. In this embodiment, the angle θ1 between the horizontal plane HZ1 passing through the first light emitting section 81 and the light LT1 emitted downward by the first light emitting section 81 is 75.1 degrees.

[0068] Return to Figure 7 In the mold grinder 100 of this embodiment, the light emitting unit 80 further includes a third light emitting unit 83, which is positioned directly below the drive axis TX on the front surface 72 of the light emitting unit 80. Positioning the light emitting unit 80 directly below the drive axis TX prevents upward light emission from the light emitting unit 80 while simultaneously increasing the illumination intensity downward. Therefore, the light emitting unit 80 can be appropriately positioned to minimize user discomfort while improving visibility of the workpiece WS.

[0069] exist Figure 9 The simulation results of the light irradiation range of the third light emitting unit 83 are schematically shown in FIG. Figure 9 As shown, the angle θ3 between the horizontal plane HZ3 passing through the third light emitting section 83 and the light LT3 irradiated downward by the third light emitting section 83 is 42.8 degrees.

[0070] Here, refer to Figures 10 to 12 As a comparative example, the irradiation range of the lighting device DL of the die grinder 100R having a configuration different from that of the die grinder 100 of this embodiment will be described. Figure 10As shown, the circuit board 70R as a comparative example has three light emitting units 80. Specifically, the light emitting units 80 include a first light emitting unit 81R arranged in the fourth quadrant Q4, a second light emitting unit 82R arranged in the third quadrant Q3, and a third light emitting unit 83R arranged just above the drive axis TX.

[0071] exist Figure 11 The simulation results of the light irradiation range of the first light emitting unit 81R are schematically shown in FIG. Figure 11 As shown, in the light irradiation range irradiated by the first light emitting section 81R, an angle θR1 between a horizontal plane HR1 passing through the first light emitting section 81R and light LR1 irradiated most downward by the first light emitting section 81R is 47.3 degrees.

[0072] From the perspective of comparing the light irradiation range of the light emitting unit 80 disposed on the side of the drive axis TX, the first light emitting unit 81 of the die grinder 100 of this embodiment and the first light emitting unit 81R of the die grinder 100R of the comparative example are compared. Figure 8 The angle θ1 formed by the die grinder 100 of the present embodiment shown in FIG. Figure 11 That is, according to the die grinder 100 of this embodiment, the first and second light emitting units 81 and 82 disposed on the sides of the drive axis TX irradiate light downward over a wider range than that of the comparative example.

[0073] exist Figure 12 The simulation result of the light irradiation range of the third light emitting unit 83R is schematically shown in FIG. Figure 12 As shown in FIG, the spindle 90, the collet nut 94, the tip tool TT and other components are arranged directly below the third light emitting portion 83R. Therefore, the light LR3 emitted downward by the third light emitting portion 83R may be blocked by these components.

[0074] like Figure 13 and Figure 14 As shown, in the mold grinder 100 of this embodiment, the irradiation range of the first light emitting unit 81 and the second light emitting unit 82 irradiating light downward is larger than that of the comparative example, and can irradiate a position closer to the top tool TT than that of the comparative example. Figure 15 and Figure 16 As shown, in the die grinder 100R of the comparative example, the illumination intensity near the tip tool TT is low.

[0075] like Figure 15 and Figure 16 As shown in FIG. 1 , in the mold grinder 100R of the comparative example, light is diffused in the left and right directions in an uneven shape in front of the tip tool TT. Figure 13 and Figure 14 As shown, according to the die grinder 100 of this embodiment, light is uniformly diffused in the left-right direction in front of the tip tool TT, and the area with high illumination in front of the tip tool TT is larger than that of the comparative example.

[0076] In addition, if Figure 16 As shown, in the mold grinder 100R of the comparative example, the light LR3 emitted downward by the third light-emitting unit 83R casts a shadow SD of the tip tool TT and other components. In contrast, in the mold grinder 100 of this embodiment, no shadow SD of the tip tool TT and other components is cast. This results in a better appearance of the illuminated area than in the comparative example. As described above, the mold grinder 100 of this embodiment can improve the visibility of the workpiece WS below the tip tool TT.

[0077] Return to Figure 7 In the die grinder 100 of this embodiment, the light emitting unit 80 is disposed on the front surface 72 of the circuit board 70 in a region close to the radially inner side, where the radially inner side is close to the drive axis TX.

[0078] exist Figure 7 Schematically illustrates two intermediate circles 72CL of the peripheral edges of the front surface 72. Specifically, the intermediate circle 72CL is formed by connecting the intermediate position between the radially inner peripheral edge 72R2 and the radially outer peripheral edge 72R1, which are closer to the drive axis TX. In the mold grinder 100 of this embodiment, the first light-emitting portion 81, the second light-emitting portion 82, and the third light-emitting portion 83 are arranged on the front surface 72 in an area radially inward of the drive axis TX relative to the intermediate circle 72CL.

[0079] Here, refer to Figures 17 to 21 As a second comparative example, the irradiation range of the light emitting portion 80 disposed in a region radially outwardly away from the drive axis TX will be described. Figure 17 As shown, the circuit substrate 70R2 of the mold grinder 100R2 as the second comparative example and the circuit substrate 70 of the mold grinder 100 of this embodiment have the same point in that the light-emitting unit 80 is arranged in three locations: the first quadrant Q1, the second quadrant Q2, and directly below the drive axis TX. However, it differs from this embodiment in that the first light-emitting unit 81R2, the second light-emitting unit 82R2, and the third light-emitting unit 83R2 are arranged radially outward from the center circle 72CL and further from the drive axis TX. In addition, the first light-emitting unit 81R2 and the second light-emitting unit 82R2 are arranged at an elevation angle of 30 degrees relative to the left-right direction D2. The simulation results of the light irradiation range of the second light-emitting unit 82R2 are the same as those of the first light-emitting unit 81R2, and therefore their description is omitted.

[0080] exist Figure 18 The simulation results of the light irradiation range of the first light emitting unit 81R2 are schematically shown in FIG. Figure 18 As shown, in the light emitted from the first light-emitting unit 81R2, the angle θRR1 between the horizontal plane HRR1 passing through the first light-emitting unit 81R2 and the light LRR1 emitted downwardly by the first light-emitting unit 81R2 is 75.0 degrees. Therefore, the forward irradiation range of the first light-emitting unit 81 of the mold grinder 100 according to this embodiment is slightly larger than that of the second comparative example. However, the light irradiation range of the first light-emitting unit 81R2 of the second comparative example is larger than that of the first light-emitting unit 81R of the mold grinder 100R of the comparative example.

[0081] exist Figure 19 The simulation results of the light irradiation range of the third light emitting unit 83R2 are schematically shown in FIG. Figure 19 As shown, the angle θRR3 between the horizontal plane HRR3 passing through the third light-emitting unit 83R2 and the light LRR3 emitted downwardly by the third light-emitting unit 83R2 is 33.3 degrees. Therefore, the light irradiation range of the third light-emitting unit 83 in the mold grinder 100 according to this embodiment is larger than the light irradiation range of the third light-emitting unit 83R2 in the second comparative example. However, the light irradiation range of the third light-emitting unit 83R2 in the mold grinder 100R2 according to the second comparative example is larger than that of the third light-emitting unit 83R in the mold grinder 100R according to the comparative example.

[0082] As described above, with respect to the light irradiation range of the first light emitting portion 81 and the second light emitting portion 82, the light irradiation range is larger when the first light emitting portion 81 and the second light emitting portion 82 are arranged in the first quadrant Q1 and the second quadrant Q2 than when the first light emitting portion 81 and the second light emitting portion 82 are arranged in the third quadrant Q3 and the fourth quadrant Q4, and is larger when the first light emitting portion 81 and the second light emitting portion 82 are arranged radially inside the middle circle 72CL than when the first light emitting portion 81 and the second light emitting portion 82 are arranged radially outside the middle circle 72CL.

[0083] like Figure 20 and Figure 21 As shown, the irradiation range below the mold grinding machine 100R2 of the second comparative example is Figure 15 and Figure 16 Compared to the mold grinder 100R of the comparative example shown, the area of ​​high illumination in front of the tip tool TT is larger, and the light is evenly diffused in the left-right direction, resulting in a better appearance. Furthermore, the illumination range of the mold grinder 100 of this embodiment is larger than that of the mold grinder 100R2 of the second comparative example. In other words, the mold grinder 100 of this embodiment can expand the area of ​​high illumination in front of the tip tool TT compared to the second comparative example.

[0084] A5. Configuration structure of the wire 12 inside the mold grinding machine 100: exist Figure 22 FIG shows the structure of the lower side of the mold grinding machine 100 with the tool housing 50 removed. Figure 22 As shown, the electric wires 12 connected to the lighting device DL are connected to the electric wires 12 on the controller 10 side via the connector 16. This will be described in detail below.

[0085] The electric wires 12 connected to the lighting device DL are guided rearward along the outer surface of the cylindrical portion 60 below the cylindrical portion 60. The electric wires 12 guided rearward of the cylindrical portion 60 pass through the through-hole 68 formed in the cylindrical portion 60 and are guided into the housing HS.

[0086] like Figure 22 As shown, a plurality of ribs 60R are formed on the outer surface of the cylindrical portion 60 from the viewpoints of weight reduction and reinforcement. In the die grinder 100 according to this embodiment, the wiring path of the electric wires 12 is efficiently formed by utilizing the ribs 60R on the lower side of the cylindrical portion 60.

[0087] like Figure 22 As shown, below the cylindrical portion 60, a first wall portion 61 and a second wall portion 62 are formed, protruding from the outer surface of the cylindrical portion 60. The first wall portion 61 and the second wall portion 62 also function as the rib portion 60R. The first wall portion 61 and the second wall portion 62 are arranged so as to extend rearward along the cylindrical portion 60 and be close to each other.

[0088] The electrical wires 12 led from the lighting device DL are arranged in the cylindrical portion electrical wiring path 63 defined between the first wall portion 61 and the second wall portion 62. The first wall portion 61 and the second wall portion 62, which also function as the rib portion 60R, enable an efficient wiring path for the electrical wires 12 to be formed around the cylindrical portion 60. Furthermore, compared to a case where a new wiring path separate from the rib portion 60R is formed in the tool housing 50 or the cylindrical portion 60, radial enlargement of the cylindrical portion 60 and the tool housing 50 can be suppressed.

[0089] like Figure 22 As shown, in the mold grinder 100 of this embodiment, a protrusion 54 is further formed between the first wall portion 61 and the second wall portion 62 to prevent the electric wire 12 from falling out of the cylindrical portion electric wire path 63. Specifically, a first protrusion 611 is provided on the surface of the first wall portion 61 facing the second wall portion 62, protruding toward the second wall portion 62. A second protrusion 622 is provided on the surface of the second wall portion 62 facing the first wall portion 61, protruding toward the first wall portion 61.

[0090] The number of first protrusions 611 and second protrusions 622 can be arbitrarily set. In this embodiment, two first protrusions 611 and one second protrusion 622 are formed. Furthermore, the first protrusions 611 and second protrusions 622 are arranged alternately in the front-to-back direction. By adopting various structures, the electric wires 12 can be arranged in a state bent in the left-right direction within the cylindrical portion electric wire circuit 63. Therefore, it is possible to more reliably suppress or prevent the electric wires 12 from falling out of the cylindrical portion electric wire circuit 63.

[0091] like Figure 23 As shown, a recess 52 is formed on the inner circumferential surface of the tool housing 50. The recess 52 is configured and positioned to accommodate the first wall 61 and the second wall 62 of the cylindrical portion 60. This structure absorbs the unevenness of the outer surface of the cylindrical portion 60 caused by the first wall 61 and the second wall 62, resulting in a smooth cylindrical shape for the tool housing 50. Furthermore, by accommodating the first wall 61 and the second wall 62 in the recess 52, the tool housing 50 is restricted from rotating relative to the cylindrical portion 60. Consequently, a mold grinding machine 100 is provided that is easy to hold and highly operable.

[0092] like Figure 24 As shown, in the die grinder 100 of this embodiment, a motor wire line 306 is provided inside the motor housing 30. The motor wire line 306 is used to guide the electric wire 12 introduced into the housing HS from the through hole 68 of the cylindrical portion 60 to the handle housing 40. This will be described in detail below.

[0093] like Figure 24 As shown, a support wall 304 is formed below the motor housing 30 to support the motor body 21 below the motor housing 21. A motor wiring path 306 is defined between the support wall 304 and the outer wall 302 of the motor housing 30. The provision of the motor wiring path 306 prevents the wires 12 from coming into contact with components within the motor housing 30 while allowing the wires 12 from the tool housing 50 to pass through the handle housing 40 at the rear of the housing HS. Furthermore, this can suppress or prevent the motor housing 30 from increasing in size in the left-right direction.

[0094] In the die grinder 100 of this embodiment, a portion of the opening 322 that functions as a vent provided in the motor bearing holder 32 also functions as a wiring path for the electric wire 12. Specifically, Figure 25 As shown, the front end 304E of the support wall portion 304 extends to the opening portion 322B disposed below the drive axis TX among the plurality of opening portions 322 provided in the motor bearing holder 32. Figure 24As shown, the through hole 68 formed in the motor housing 30 is arranged to face the front end of the motor wiring 306 via the opening 322B. As described above, the cylindrical wiring 63, the opening 322, and the motor wiring 306 are connected to each other.

[0095] According to the die grinder 100 of this embodiment, by utilizing a portion of the vent opening of the motor bearing holder 32 as a routing path for the electric wires 12, it is possible to suppress or prevent radial enlargement of the motor housing 30, compared to a case where a routing path is formed that bypasses the motor bearing holder 32. For example, it is possible to suppress downward protrusion of the outer shape of the motor housing 30. Furthermore, by utilizing the opening 322 provided as the vent opening in the motor bearing holder 32, it is possible to form a routing path for the electric wires 12 connecting the tool housing 50 and the motor housing 30 without changing the design of the motor bearing holder 32.

[0096] As described above, according to the die grinder 100 of this embodiment, the light emitting unit 80 includes at least a first light emitting unit 81 disposed in the quadrant to the upper right of the drive axis TX, and a second light emitting unit 82 disposed in the quadrant to the upper left of the drive axis TX. According to the die grinder 100 of this embodiment, light directed in front of the tip tool TT can be uniformly diffused in the left-right direction on the workpiece WS below, and the area with high illumination can be expanded. Consequently, visibility of the workpiece WS below the tip tool TT can be improved.

[0097] The light-emitting unit 80 of the die grinder 100 of this embodiment further includes a third light-emitting unit 83 positioned directly below the drive axis TX. Positioning the light-emitting unit 80 directly below the drive axis TX prevents the light-emitting unit 80 from radiating light LT upward, while simultaneously increasing the illumination intensity on the workpiece WS below. Consequently, the light-emitting unit 80 can be appropriately positioned to minimize user discomfort while improving visibility of the workpiece WS.

[0098] According to the mold grinder 100 of this embodiment, the light emitting portion 80 is arranged in an area radially inward of the intermediate circle 72CL on the front surface 72. According to the mold grinder 100 of this embodiment, the range of light irradiation on the workpiece WS can be expanded compared to a case where the light emitting portion 80 is arranged in an area radially outward of the intermediate circle 72CL.

[0099] The die grinder 100 of this embodiment includes a protective member 86 in front of the light emitting unit 80 that transmits light LT from the light emitting unit 80. The protective member 86 includes a base 862 and a claw 864. The base 862 extends rearward from the main body 860. The claw 864 is provided at the top of the base 862 and is configured to engage with a recess 662 provided in the component positioned rearward of the circuit board 70. The use of a snap fastener for attaching and detaching the lighting device DL facilitates attachment and detachment, allowing for easy repair of the lighting device DL.

[0100] According to the die grinder 100 of this embodiment, the recess 662 is provided on the outer surface of the bearing holder 66. The circuit board 70 and the two or more light-emitting units 80 are held between the bearing holder 66 and the protective member 86, with the claws 864 and recess 662 engaged. Compared to a case where the protective member 86 is engaged with the outer circumferential surface of the cylindrical portion 60, radial enlargement of the protective member 86 can be suppressed, thereby suppressing or preventing radial enlargement of the tool housing 50.

[0101] According to the die grinder 100 of this embodiment, the cylindrical portion 60 includes a first wall portion 61 and a second wall portion 62 protruding from the outer surface of the cylindrical portion 60. The electric wires 12 connected to the circuit board 70 are arranged in the cylindrical portion electric wire path 63 defined by the first wall portion 61 and the second wall portion 62. The first wall portion 61 and the second wall portion 62 can reinforce the cylindrical portion 60 and efficiently arrange the electric wires 12 around the cylindrical portion 60.

[0102] According to the die grinder 100 of this embodiment, a first protrusion 611 is provided on the surface of the first wall portion 61 facing the second wall portion 62, protruding toward the second wall portion 62. A second protrusion 622 is provided on the surface of the second wall portion 62 facing the first wall portion 61, protruding toward the first wall portion 61. This allows the electric wire 12 to be arranged in a left-right bent state within the cylindrical portion electric wire path 63. Consequently, the electric wire 12 can be more reliably suppressed or prevented from falling out of the cylindrical portion electric wire path 63.

[0103] According to the mold grinder 100 of this embodiment, a recessed portion 662 is provided on the inner surface of the tool housing 50 to accommodate the first wall portion 61 and the second wall portion 62. This allows the tool housing 50 to have a smooth cylindrical shape by absorbing the irregularities on the outer surface of the cylindrical portion 60 caused by the first wall portion 61 and the second wall portion 62. Furthermore, by accommodating the first wall portion 61 and the second wall portion 62 in the recessed portion 52, the tool housing 50 is restricted from rotating relative to the cylindrical portion 60. Consequently, a mold grinder 100 that is easy to hold and highly operable can be provided.

[0104] According to the die grinder 100 of this embodiment, the motor housing 30 is provided with a motor wire line 306 for passing the electric wire 12 between the support wall portion 304 and the outer wall 302. This prevents the electric wire 12 from coming into contact with various components within the motor housing 30 while allowing the electric wire 12 from the tool housing 50 to pass toward the handle housing 40 at the rear of the housing HS.

[0105] According to the mold grinder 100 of this embodiment, the cylindrical portion wiring line 63, the opening 322, and the motor wiring line 306 are interconnected. Compared to a case where a wiring path is formed that bypasses the motor bearing holder 32, it is possible to suppress or prevent the motor housing 30 from increasing in size in the radial direction. For example, it is possible to suppress the downward protrusion of the outer shape of the motor housing 30. In addition, by utilizing the opening 322 provided in the motor bearing holder 32 as a vent, it is possible to form a wiring path for the electrical wires 12 connecting the tool housing 50 and the motor housing 30 without changing the design of the motor bearing holder 32.

[0106] According to the die grinding machine 100 of this embodiment, the controller 10 is arranged at a position where the drive axis TX passes, so that the radial dimension of the housing HS can be reduced in size.

[0107] According to the die grinder 100 of this embodiment, the motor rotation axis MX and the drive axis TX are coaxial, so that the radial dimension of the housing HS can be reduced in size.

[0108] B. Other implementation methods: (B1) In the mold grinding machine 100 of the first embodiment described above, the direction perpendicular to the drive axis TX, from the cross-sectional center HX of the gripping portion 42 toward the drive axis TX, is defined as the downward direction. Alternatively, the upward or downward direction may be defined using the methods described in (B1.1) to (B1.5) below.

[0109] (B1.1) Figure 26 As shown, the direction DB of attaching and detaching the battery BT on the battery mounting portion 46 can be defined as the vertical direction. In this case, the direction DD2 from the cross-sectional center HX of the grip portion 42 or from the drive axis TX toward the handle recess 44 along the attaching and detaching direction DB is defined as the downward direction.

[0110] (B1.2) Figure 27 The position of the top portion TP with the largest curvature in the outer shape HF of the cross-sectional shape of the gripping portion 42 is shown in FIG. The direction DD3 from the drive axis TX toward the top portion TP can be defined as the downward direction. In addition, the direction from the cross-sectional center HX of the gripping portion 42 toward the top portion TP can be defined as the downward direction instead of the drive axis TX. Figure 27Shown in Figure 3 By placing the top portion TP having the largest curvature at the bottom, the grip portion 42 can be made into a shape that is easy for the user to grip.

[0111] (B1.3) Figure 28 As shown, the direction DU1 from the drive axis TX toward the operating portion SW1, which is perpendicular to the drive axis TX, can be defined as the upward direction. Alternatively, instead of the drive axis TX, the direction from the cross-sectional center HX of the grip 42 toward the operating portion SW1 can be defined as the upward direction. Positioning the operating portion SW1 upward allows the user to easily operate the grip 42 while holding it.

[0112] (B1.4) Figure 29 and Figure 30 As shown, instead of or in addition to the operating unit SW1 shown in the first embodiment, operating units SW2 and SW3 for switching between starting and stopping the motor 20 may be provided on the side surfaces of the housing HS. Providing the operating units SW2 and SW3 on the side surfaces allows the user to easily operate the unit while holding the grip 42.

[0113] In this case, the directions DS1 and DS2 from the cross-sectional center HX of the grip portion 42 toward the operating portions SW2 and SW3 can be defined as the right direction or the left direction. Alternatively, instead of the cross-sectional center HX of the grip portion 42, the direction from the drive axis TX toward the operating portions SW2 and SW3 can be defined as the right direction or the left direction.

[0114] (B1.5) Figure 31 As shown, a paddle switch SW4 may be provided on the housing HS in place of or in addition to the operating portion SW1 shown in the first embodiment. The paddle switch SW4 activates the motor 20 by sliding or pressing, and stops the motor 20 when the paddle switch SW4 is released. In this case, the direction DD4 from the drive axis TX toward the paddle switch SW4 can be defined as the downward direction. Alternatively, the direction from the cross-sectional center HX of the grip 42 toward the paddle switch SW4 can be defined as the downward direction in place of the drive axis TX.

[0115] (B2) In the mold grinder 100 of the first embodiment described above, an example is shown in which the light emitting unit 80 includes a first light emitting unit 81 arranged in the first quadrant Q1, a second light emitting unit 82 arranged in the second quadrant Q2, and a third light emitting unit 83 arranged directly below the drive axis TX. Alternatively, the mold grinder 100 may not include the third light emitting unit 83, but may include only the first light emitting unit 81 arranged in the first quadrant Q1 and the second light emitting unit 82 arranged in the second quadrant Q2. Even in this case, the forward illumination range of the first light emitting unit 81 and the second light emitting unit 82 arranged lateral to the drive axis TX can be expanded, thereby improving visibility of the workpiece WS.

[0116] In addition, four or more light emitting units 80 may be provided on the premise that there are the first light emitting unit 81 arranged in the first quadrant Q1 and the second light emitting unit 82 arranged in the second quadrant Q2. By increasing the number of light emitting units 80, the illumination of the processing object WS can be further improved. Figure 32 In the example shown in FIG. 7 , six light-emitting units 80 are provided. Specifically, in addition to the first light-emitting unit 81, the second light-emitting unit 82, and the third light-emitting unit 83, a fourth light-emitting unit 84, a fifth light-emitting unit 85, and a sixth light-emitting unit 87 are provided. In this case, it is preferable that each light-emitting unit 80, including the fourth light-emitting unit 84, the fifth light-emitting unit 85, and the sixth light-emitting unit 87, be positioned inward of the intermediate circle 72CL. This configuration can increase the illumination range of each light-emitting unit 80.

[0117] (B3) In the above-described embodiments, a battery mounting portion 46 configured to house a removable battery BT is provided at the rear end of the handle housing 40 of the mold grinder 100. Alternatively, a power cord capable of connecting to an external AC power source, such as a commercial power source, may be provided in place of the battery mounting portion 46. In this case, power supplied by the commercial power source is supplied to the motor 20 via wires and connectors disposed within the housing HS. The motor 20 is driven by this AC power. In this case, an AC motor may be used instead of a DC motor.

[0118] (B4) Furthermore, the following aspects have been developed based on the gist of the present invention and the above-described embodiments. The following aspects can be used in combination with the die grinder 100 shown in each embodiment and the above-described modifications, or the disclosures described in each claim.

[0119] The present invention is not limited to the above-described embodiments and can be implemented in various configurations without departing from the scope of the present invention. For example, in order to solve some or all of the above-described technical problems or achieve some or all of the above-described effects, the technical features in the embodiments corresponding to the technical features in the various embodiments described in the "Summary of the Invention" column can be appropriately replaced or combined. In addition, if the technical features are not described as essential in this specification, they can be appropriately deleted.

Claims

1. A mold grinding machine, characterized in that, It has a motor, a main shaft, a housing and two or more light-emitting parts, wherein: The motor is driven by electricity; The main shaft is driven to rotate about a drive axis defining the front-rear direction of the mold grinder by the power of the motor; The housing includes a motor housing, a handle housing, and a tool housing, wherein the motor housing accommodates the motor; the handle housing is connected to the rear of the motor housing and includes a grip portion configured for a user to grip; the tool housing is used to dispose the spindle and the circuit substrate; The two or more light emitting units are assembled on the front surface of the circuit substrate. The direction from the cross-sectional center of the grip portion toward the drive axis in a direction orthogonal to the drive axis is defined as a downward direction. When the front surface is divided into four quadrants by the up-down direction passing through the drive axis and the left-right direction passing through the drive axis and orthogonal to the up-down direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

2. A mold grinding machine, characterized in that: It has a motor, a main shaft, a housing, two or more light-emitting parts, and a battery mounting part, wherein: The motor is driven by electricity supplied by a battery; The main shaft is driven to rotate around a drive axis defining the front-rear direction of the mold grinder by the power of the motor; The housing includes a motor housing, a handle housing, and a tool housing, wherein the motor housing accommodates the motor; the handle housing is connected to the rear of the motor housing and includes a grip portion configured for a user to grip; the tool housing is used to dispose the spindle and the circuit substrate; The two or more light-emitting units are assembled on the front surface of the circuit substrate; The battery mounting portion is capable of mounting and dismounting the battery along a mounting and dismounting direction intersecting the drive axis. The handle housing includes a handle recessed portion configured such that an outer surface of the handle housing is concave relative to an outer surface of the motor housing. The direction from the drive axis toward the handle recess along the detachment direction is defined as a downward direction. When the front surface is divided into four quadrants by the up-down direction passing through the drive axis and the left-right direction passing through the drive axis and orthogonal to the up-down direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

3. A mold grinding machine, characterized in that: It has a motor, a main shaft, a housing and two or more light-emitting parts, wherein: The motor is driven by electricity; The main shaft is driven to rotate around a drive axis defining the front-rear direction of the mold grinder by the power of the motor; The housing includes a motor housing, a handle housing, and a tool housing, wherein the motor housing accommodates the motor; the handle housing is connected to the rear of the motor housing and includes a grip portion configured for a user to grip; the tool housing is used to dispose the spindle and the circuit substrate; The two or more light emitting units are assembled on the front surface of the circuit substrate. The position with the largest curvature in the cross-sectional shape of the grip portion is defined as the tip portion, and the direction from the cross-sectional center of the grip portion or the drive axis toward the tip portion is defined as the downward direction. When the front surface is divided into four quadrants by the up-down direction passing through the drive axis and the left-right direction passing through the drive axis and orthogonal to the up-down direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

4. A mold grinding machine, characterized in that: It has a motor, a main shaft, a housing, two or more light-emitting parts, and an operating part, wherein: The motor is driven by electricity; The main shaft is driven to rotate around a drive axis defining the front-rear direction of the mold grinder by the power of the motor; The housing includes a motor housing, a handle housing, and a tool housing, wherein the motor housing accommodates the motor; the handle housing is connected to the rear of the motor housing and includes a grip portion configured for a user to grip; the tool housing is used to dispose the spindle and the circuit substrate; The two or more light-emitting units are assembled on the front surface of the circuit substrate; The operating unit is provided on the housing and is used to switch the start and stop of the motor. The direction from the cross-sectional center of the grip portion or the drive axis toward the operating portion in a direction orthogonal to the drive axis is defined as an upward direction. When the front surface is divided into four quadrants by the up-down direction passing through the drive axis and the left-right direction passing through the drive axis and orthogonal to the up-down direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

5. A mold grinding machine, characterized in that: It has a motor, a main shaft, a housing, two or more light-emitting parts, and an operating part, wherein: The motor is driven by electricity; The main shaft is driven to rotate around a drive axis defining the front-rear direction of the mold grinder by the power of the motor; The housing includes a motor housing, a handle housing, and a tool housing, wherein the motor housing accommodates the motor; the handle housing is connected to the rear of the motor housing and includes a grip portion configured for a user to grip; the tool housing is used to dispose the spindle and the circuit substrate; The two or more light-emitting units are assembled on the front surface of the circuit substrate; The operating unit is provided on the housing and is used to switch the start and stop of the motor. The direction from the cross-sectional center of the grip portion or the drive axis toward the operating portion in a direction orthogonal to the drive axis is defined as the right direction or the left direction. When the front surface is divided into four quadrants which are orthogonal to the left-right direction and pass through the up-down direction of the drive axis, and the left-right direction of the drive axis, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

6. A mold grinding machine, characterized in that: It has a motor, a main shaft, a housing, two or more light-emitting parts, and a paddle switch, wherein: The motor is driven by electricity; The main shaft is driven to rotate around a drive axis defining the front-rear direction of the mold grinder by the power of the motor; The housing includes a motor housing, a handle housing, and a tool housing, wherein the motor housing accommodates the motor; the handle housing is connected to the rear of the motor housing and includes a grip portion configured for a user to grip; the tool housing is used to dispose the spindle and the circuit substrate; The two or more light-emitting units are assembled on the front surface of the circuit substrate; The paddle switch is provided on the handle portion and is used to switch the start and stop of the motor. The direction from the cross-sectional center of the grip portion toward the paddle switch is defined as a downward direction. When the front surface is divided into four quadrants by the up-down direction passing through the drive axis and the left-right direction passing through the drive axis and orthogonal to the up-down direction, the two or more light-emitting portions include at least a first light-emitting portion and a second light-emitting portion, wherein the first light-emitting portion is arranged in the quadrant to the upper right of the drive axis among the four quadrants; and the second light-emitting portion is arranged in the quadrant to the upper left of the drive axis among the four quadrants.

7. The mold grinding machine according to any one of claims 1 to 6, characterized in that The two or more light emitting parts further include a third light emitting part, and the third light emitting part is arranged below the drive axis on the front surface.

8. The mold grinding machine according to any one of claims 1 to 7, characterized in that The front surface has a circular ring shape, When the circle connecting the middle position of the inner peripheral portion and the outer peripheral portion close to the drive axis of the two peripheral portions of the front surface is set as the middle circle, the two or more light-emitting portions are arranged on the front surface in an area closer to the inside than the middle circle.

9. The mold grinding machine according to any one of claims 1 to 8, characterized in that It also has a protective component, which is arranged in front of the light-emitting part to allow the light of the light-emitting part to pass through. The protection component has a main body, a base and a claw, wherein The main body covers the light emitting portion; the base extends rearward from the main body; the claw is provided at the top end of the base and is configured to fit into a recess provided in a component disposed at a position rearward of the circuit substrate.

10. The mold grinding machine according to claim 9, characterized in that It also has a spindle bearing, a cylindrical portion and a bearing retainer, wherein The main shaft bearing rotatably supports the main shaft; The cylindrical portion accommodates the main shaft bearing; The bearing holder is arranged in front of the main shaft bearing and is fixed to the front end of the cylindrical portion. The recess is provided on the outer surface of the bearing retainer. The circuit substrate and the two or more light emitting units are held between the bearing holder and the protective member in a state in which the claws and the recesses are engaged with each other.

11. The mold grinding machine according to any one of claims 1 to 10, characterized in that having a cylindrical portion, the cylindrical portion accommodating at least a portion of the main shaft, The cylindrical portion includes a first wall portion and a second wall portion protruding from an outer surface of the cylindrical portion. The electric wires connected to the circuit board are arranged in the cylindrical electric wire path defined by the first wall portion and the second wall portion.

12. The mold grinding machine according to claim 11, characterized in that A first protrusion protruding toward the second wall portion is provided on a surface of the first wall portion facing the second wall portion. A second protrusion protruding toward the first wall portion is provided on a surface of the second wall portion that faces the first wall portion.

13. The mold grinding machine according to claim 11 or 12, characterized in that: A recessed portion is provided on the inner surface of the tool housing, and the recessed portion is capable of accommodating the first wall portion and the second wall portion.

14. The die grinding machine according to any one of claims 11 to 13, characterized in that The motor housing includes an outer wall portion of the motor housing and a support wall portion supporting the motor inside the motor housing. The motor housing includes a motor wire line provided between the support wall portion and the outer wall portion, through which the wires pass.

15. The mold grinding machine according to claim 14, characterized in that It also has a fan, a motor bearing and a motor bearing holder, wherein: The fan is used to cool the motor; The motor bearing is provided in the housing between the motor and the main shaft to rotatably support the motor shaft of the motor; The motor bearing holder supports the motor bearing, The motor bearing holder has an opening portion, and the opening portion can allow the airflow sent from the fan to pass through. The cylindrical portion electric line, the opening, and the motor electric line are configured to communicate with each other.

16. The die grinding machine according to any one of claims 1 to 15, characterized in that It also includes a controller configured to control the operation of the mold grinding machine. The controller is arranged at a position where the drive axis passes.

17. The mold grinding machine according to any one of claims 1 to 16, characterized in that The motor has a motor shaft which is driven to rotate about a motor rotation axis. The motor rotation axis and the drive axis are coaxially configured.

18. The mold grinding machine according to claim 1 or any one of claims 3 to 6, characterized in that: It also has a battery and a battery mounting portion, wherein The battery is used to supply power to the motor; The battery installation portion can detachably install the battery.

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