Magnetic drilling machine

Abstract

The invention provides an improved magnetic drilling machine, which comprises a magnetic base, a drill rod and a drill rod, the main body part is connected to the magnetic base; a drill unit that includes a main shaft and is supported by the main body so as to be movable in a direction parallel to a rotation axis of the main shaft; a battery mounting part configured to detachably hold the battery; and a cover configured to at least partially cover the battery mounting portion. The battery mounting portion includes: a rail configured to slidably engage with a groove of the battery when the battery moves from a first side to a second side in a first direction with respect to the rail; and a terminal part having a terminal configured to be electrically connected to a terminal of the battery. The cover is movable relative to the main body portion, and is configured to overlap with an entirety of the terminal portion when viewed from a first side in the first direction when the cover is located at the first position.

Description

Technical Field

[0001] The present disclosure relates to a magnetic drilling machine. Background Art

[0002] The magnetic drilling machine is a device that uses magnetic force to fix a workpiece formed of a magnetic body, moves an electric drill supported by a main body relative to the workpiece, and uses a front end tool installed on the electric drill to perform a hole drilling operation on the workpiece.

[0003] For example, Japanese Patent Publication No. 2020-157471 discloses a magnetic drilling machine that uses a battery as a power source. In addition, Japanese Patent Publication No. 2011-104678 discloses a magnetic drilling machine that can supply cutting fluid contained in a tank to a front end tool in order to prevent sintering of the front end tool. Summary of the invention

[0004] The above-mentioned magnetic drilling machine has room for improvement. The purpose of the present disclosure is to provide an improvement of the magnetic drilling machine.

[0005] According to a non-limiting embodiment of the present disclosure, a magnetic drill press is provided, which has a magnetic base, a main body, a drill unit, a battery mounting portion and a cover. The magnetic base is configured to be selectively fixed to a workpiece using magnetic force. The main body is connected to the magnetic base. The drill unit includes a spindle, which is configured to hold a front end tool (also called a chisel) in a detachable manner. The drill unit is supported on the main body in a manner that allows it to move axially relative to the rotation axis of the spindle. That is, the drill unit is supported on the main body in a manner that allows it to move in a direction parallel to the rotation axis of the spindle. The battery mounting portion is configured to hold a battery for supplying power to the magnetic drill press in a detachable manner. In addition, the battery mounting portion can be provided on the main body or on the drill unit. The cover is configured to at least partially cover the battery mounting portion.

[0006] The battery mounting portion includes a track and a terminal portion. The track extends linearly in a first direction. The guide rail is configured to slide and engage with a groove of the battery in accordance with the movement of the battery from a first side to a second side relative to the track in the first direction. The terminal portion includes a terminal configured to be electrically connected to a terminal of the battery in accordance with the battery being arranged at a specified position of the battery mounting portion. The cover is displaceable relative to the main body portion, and is configured to overlap with the entirety of the terminal portion when the cover is located at a first position and viewed from a first side in a first direction. In other words, when the cover located at the first position is projected from a first side in the first direction, the entirety of the terminal portion is included in the projection area of ​​the cover.

[0007] According to this embodiment, the cover disposed at the first position can reduce the possibility that the chips enter the battery mounting portion from the first side of the first direction and adhere to the terminal portion. In addition, the cover disposed at the first position can reduce the possibility that the terminal portion is damaged by applying some impact to the terminal portion from the first side of the first direction. In addition, the cover can also be configured so that when the cover is in the first position, it overlaps with the entire battery mounting portion when viewed from the first side of the first direction.

[0008] According to another non-limiting embodiment of the present disclosure, a magnetic drilling machine is provided, which has a magnetic base, a battery receiving portion, a guide portion, a guided portion, a motor, a drill unit and a cover. The magnetic base is configured to be selectively fixed to a workpiece using a magnetic force. The battery receiving portion is connected to the upper side of the magnetic base and has an opening at the upper portion. The guide portion is connected to the battery receiving portion. The guided portion is guided in the up-down direction by the guide portion. The motor is connected to the guided portion and rotates using the power supplied from the battery receiving portion. The drill unit includes a spindle that rotates using the motor. The cover is configured to cover the opening.

[0009] According to this embodiment, the cover can cover the opening of the upper part of the battery storage part. Therefore, the possibility of chips entering the inside of the battery storage part from the outside can be reduced. In addition, the cover can protect the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view of the magnetic drill press according to the first embodiment, showing the cover in the closed position.

[0011] Figure 2 is another perspective view of the magnetic drill press when the hood is in the closed position.

[0012] Figure 3 is a cross-sectional view of the magnetic drill press when the hood is in the closed position.

[0013] Figure 4 yes Figure 3 Cross-sectional view at line IV-IV.

[0014] Figure 5 It is a top view of the magnetic drill press.

[0015] Figure 6 is a perspective view of the magnetic drill press when the hood is in the open position.

[0016] Figure 7 is a cross-sectional view of the magnetic drill press when the hood is in the open position.

[0017] Figure 8 It is a partial perspective view of the magnetic drilling machine according to the second embodiment.

[0018] Fig. 9 It is a three-dimensional diagram of the exhaust nozzle.

[0019] Fig.10 This is a cross-sectional view for explaining the connection method between the exhaust port and the exhaust nozzle.

[0020] Fig.11 It is a perspective view of a magnetic drilling machine according to a third embodiment.

[0021] Fig.12 It is another stereoscopic image of the magnetic drill press.

[0022] Fig.13 It is the left side view of the magnetic drill press.

[0023] Fig.14 is a cross-sectional view of a magnetic drilling machine.

[0024] Fig.15 It is a perspective view of a magnetic drilling machine according to a fourth embodiment.

[0025] Fig.16 It is a schematic perspective view of a magnetic drilling machine according to a fifth embodiment.

[0026] Fig.17 It is a schematic perspective view of a magnetic drilling machine according to a fifth embodiment.

[0027] Fig.18 This is a schematic diagram showing a structure for switching the permanent magnet between the maximum state and the minimum state.

[0028] Fig.19 It is a schematic diagram showing the arrangement of magnets in each of the maximum state and the minimum state.

[0029] Fig. 20 is a schematic perspective view of a magnetic drilling machine according to a sixth embodiment, wherein the drill unit and the main housing are in a non-tilted state;

[0030] Fig.21 is a schematic perspective view of a magnetic drilling machine according to a sixth embodiment, wherein the drill unit and the main housing are in a tilted state;

[0031] Fig. 22 It is a schematic perspective view of a magnetic drilling machine according to a seventh embodiment.

[0032] Fig.23 It is a schematic perspective view of a magnetic drilling machine according to a seventh embodiment.

[0033] Fig.24 It is a schematic perspective view of a magnetic drilling machine according to an eighth embodiment.

[0034] Fig.25 It is a schematic exploded perspective view of a magnetic drilling machine according to an eighth embodiment.

[0035] Fig.26It is a partial cross-sectional view showing the arrangement of the cam and the protruding member, with the protruding member being located in the retracted position.

[0036] Fig. 27 It is a partial cross-sectional view showing the arrangement of the cam and the protruding member, with the protruding member being in a protruding position.

[0037] Fig.28 It is a schematic left side view showing the use state of the magnetic drilling machine according to the eighth embodiment, and the protruding member is located in the protruding position.

[0038] Fig.29 It is a schematic perspective view of a magnetic drilling machine according to a ninth embodiment.

[0039] Fig.30 It is a schematic perspective view of a magnetic drilling machine according to a tenth embodiment.

[0040] Fig.31 It is a schematic perspective view of a magnetic drilling machine according to a tenth embodiment. DETAILED DESCRIPTION

[0041] Hereinafter, representative and non-limiting specific examples of the present invention will be described in detail with reference to the accompanying drawings. This detailed description is intended to simply show the details of preferred examples for implementing the present invention to those skilled in the art, and is not intended to limit the scope of the present invention. In addition, the additional features and inventions disclosed below can be used separately or together with other features and inventions in order to provide further improved devices, methods of manufacturing and methods of use thereof.

[0042] In addition, the combination of features and processes disclosed in the following detailed description is not necessary for practicing the present invention in the broadest sense, but is only recorded for the purpose of specifically illustrating the representative specific examples of the present invention. Furthermore, the various features of the representative specific examples described above and below, as well as the various features described in the independent and dependent claims, do not have to be combined as described in the specific examples or in the order in which they are listed to provide additional and useful embodiments of the present invention.

[0043] All features described in this specification and / or claims are different from the structures of features described in the embodiments and / or claims, and are intended to be disclosed separately and independently of each other as limitations on the disclosure of the original application and the specific matters of the claims. In addition, the description of all numerical ranges and groups or groups has the intention of disclosing the intermediate structures thereof as limitations on the disclosure of the original application and the specific matters of the claims.

[0044] In a non-limiting embodiment of the present disclosure, the cover can be configured to substantially cover the entire portion of the battery installed in the battery mounting portion that is exposed from the battery mounting portion when the cover is in the first position. According to this embodiment, the cover configured in the first position can protect the battery and the terminal portion from impacts from various directions.

[0045] On the basis of the above-mentioned embodiment, or in place of the above-mentioned embodiment, the battery mounting portion may also have a recess configured to fit at least a portion of the battery. The recess may have an opening on a first side in a first direction. The cover may be configured to substantially block the opening of the recess when the cover is in the first position. According to this embodiment, when the cover is configured in the first position, the wall portion and the cover defining the recess can substantially cover the entirety of the battery. Therefore, the possibility of chips entering the battery mounting portion can be reliably reduced. In addition, the wall portion and the cover defining the recess can protect the battery and the terminal portion from impacts from various directions.

[0046] In addition to the above embodiment, or in place of the above embodiment, the recess may be configured to accommodate at least half of the battery. According to this embodiment, the battery can be more effectively protected from impact.

[0047] In addition to or in place of the above embodiment, the magnetic drill press may further include a locking member configured to lock the cover relative to the main body at the first position. According to this embodiment, when the first side of the magnetic drill press is set to face the direction of gravity, the cover can reduce the possibility of the battery falling.

[0048] In addition to the above embodiment, or in place of the above embodiment, the cover may be connected to the main body in a manner that allows rotation between a first position and a second position. The cover may be configured to allow the battery to be installed and removed when the cover is in the second position. According to this embodiment, a cover with good operability can be realized.

[0049] In addition to the above embodiment, or in place of the above embodiment, the first direction may be an axial direction relative to the rotation axis of the spindle (i.e., a direction parallel to the rotation axis of the spindle). According to this embodiment, when the magnetic drill is in a posture where the rotation axis of the spindle extends in the vertical direction, the battery can be easily installed and removed even when there are walls around the magnetic drill.

[0050] <First Embodiment>

[0051] Reference Figure 1 to Figure 7 , a magnetic drill 1A according to an exemplary first embodiment is described. The magnetic drill 1A is a portable electric tool. More specifically, the magnetic drill 1A is configured to be fixed to a workpiece 99 (only in the case of a magnetic body (for example, steel)) by magnetic force. Figure 3 In the state shown in the figure, an electric tool is used to drill a hole on a workpiece 99 using an electric drill. In addition, the magnetic drilling machine 1A is also called a magnetic drill or a magnetic drilling device.

[0052] First, the schematic structure of the magnetic drilling machine 1A is described. Figure 1 and Figure 2 As shown, the magnetic drilling machine 1A has: a magnetic base 2, which is configured to be selectively fixed to the workpiece 99 by magnetic force; a main body 3, which is connected to the magnetic base 2; and a drill unit 4, which is supported by the main body 3. The drill unit 4 has a spindle (also called a drill bit) 45, which is configured to hold a front end tool 91 (for example, a ring tool, a spiral drill bit) in a detachable manner. The drill unit 4 is supported on the main body 3 in a manner that can move relative to the main body 3 in the axial direction of the rotation axis R1 of the spindle 45 (in a direction substantially parallel to the rotation axis R1). The drill unit 4 moves by manual operation of the user according to the handle 32 provided on the main body 3. While the drill unit 4 moves in a direction approaching the workpiece 99, a hole is formed in the workpiece 99 by the front end tool 91 rotating together with the spindle 45.

[0053] Hereinafter, the detailed structure of the magnetic drilling machine 1A will be described.

[0054] First, the magnetic base 2 is described. Figure 3 As shown, the magnetic base 2 includes: a holder 21 having a contact surface 211 capable of contacting the workpiece 99; and a magnet 20 supported by the holder 21. In the present embodiment, the magnet 20 is a permanent magnet. The magnet 20 is supported so as to be rotatable relative to the holder 21 with the rotation axis R2 as the center. The rotation axis R2 extends in a direction substantially orthogonal to the rotation axis R1 of the spindle 45. Since it is a known technology, detailed illustrations and descriptions are omitted, but the magnetic force acting on the workpiece 99 changes according to the change in the position of the magnet 20 centered on the rotation axis R2. When the magnet 20 is arranged at a predetermined position centered on the rotation axis R2, the workpiece 99 is adsorbed and fixed to the contact surface 211 by the magnetic force generated by the magnet 20.

[0055] It should be noted that in the following description, for the sake of convenience, the extension direction of the rotation axis R1 of the spindle 45 is defined as the up-down direction of the magnetic drilling machine 1A. In the up-down direction, the side where the contact surface 211 is located is defined as the lower side of the magnetic drilling machine 1A, and the opposite side is defined as the upper side. In addition, the extension direction of the rotation axis R2 of the magnet 20 is defined as the front-to-back direction of the magnetic drilling machine 1A. In the front-to-back direction, the side where the spindle 45 is located relative to the magnetic base 2 is defined as the front side of the magnetic drilling machine 1A, and the opposite side is defined as the rear side. In addition, the direction orthogonal to the rotation axis R1 of the spindle 45 and the rotation axis R2 of the magnet 20 is defined as the left-right direction of the magnetic drilling machine 1A.

[0056] Next, the main body 3 will be described. Figure 1 to Figure 3 As shown, the main body 3 is connected to the magnetic base 2 on the side opposite to the contact surface 211 in the vertical direction of the magnetic drilling machine 1A. That is, the main body 3 is arranged on the upper side of the magnetic base 2. The main body 3 is a support body that supports the drill unit 4, and is also called a drill table, a main housing, etc.

[0057] A manual operating member 25 for rotating the magnet 20 is disposed at the lower rear end portion of the main body 3. In addition, in the present embodiment, the manual operating member 25 is a knob that can be rotated around an axis parallel to the rotation axis R2, and is connected to the magnet 20 in an operable manner. By operating the manual operating member 25 (rotating the knob), the user can rotate the magnet 20 around the rotation axis R2 and change the strength of the magnetic force acting on the workpiece 99, that is, change the degree of fixation of the magnetic base 2 relative to the workpiece 99. In addition, the manual operating member 25 for rotating the magnet 20 may be, for example, a sliding rod. In addition, the manual operating member 25 may also be provided on the magnetic base 2 instead of on the main body 3.

[0058] like Figure 3 and Figure 4As shown, the main body 3 has a battery mounting portion 33, which is configured to receive a battery 93 in a detachable manner. The battery 93 is a rechargeable battery having a known structure, and has a substantially rectangular parallelepiped housing 930 in which a plurality of battery cells are built. A locking member 934 that can move between a protruding position and a retracted position and a terminal portion 937 having a terminal are provided on one of the six faces of the housing 930 having the largest area. A groove 931 that extends linearly in the longitudinal direction of the battery 93 is formed on two opposite faces different from the face. In addition, the length, width, height of the battery 93 and the arrangement of the locking member 934, the terminal portion 937, and the groove 931 can be arbitrarily set. Therefore, for example, the locking member 934 and the terminal portion 937 can be provided on the face having the smallest area, or can be provided on the face having an intermediate area between the largest area and the smallest area. The structure of the battery mounting portion 33 that receives the battery 93 will be described in detail later.

[0059] The connection structure between the main body 3 and the drill unit 4 is described below. Figure 1 and Figure 3 As shown, the drill unit 4 is connected to the main body 3 so as to be movable in the vertical direction relative to the main body 3. More specifically, the main body 3 and the drill unit 4 are connected via a rail 30 provided on the main body 3 and a rack 44 provided on the drill unit 4.

[0060] The track 30 is arranged at the front end of the main body 3 and extends linearly in the vertical direction. The rack 44 is in the shape of a rod extending in the up-down direction, and is arranged at the rear end of the drill unit 4 (in detail, fixed to the rear end of the housing 40 described later), and can be slidably engaged with respect to the track 30 in the up-down direction. Although detailed illustrations are omitted, the teeth of the rack 44 are formed on the rear surface of the rack 44. The rack 44 is meshed with the pinion 321. The pinion 321 is connected to the handle 32 that can be manually operated by the user in an operable manner. When the pinion 321 rotates according to the manual operation of the handle 32, the drill unit 4 having the rack 44 moves linearly in the up-down direction relative to the main body 3.

[0061] Thus, in the present embodiment, the rack 44 and the pinion 321 constitute a moving mechanism of the drill unit 4 relative to the main body 3. In addition, the rack 44 constitutes a part of a connection structure that connects the drill unit 4 and the main body 3 in a manner that allows relative movement in the up and down directions. However, the connection structure and moving mechanism of the drill unit 4 and the main body 3 are not limited to this example, and any known connection structure and moving mechanism may also be used. The moving mechanism of the drill unit 4 may also, for example, adopt a feed screw mechanism including a feed screw shaft and a nut. In addition, for example, the connection structure and the moving mechanism may also be provided separately.

[0062] The following describes the details of the drill unit 4. Figure 1 and Figure 3 As shown, the drill unit 4 of the present embodiment includes a housing 40 , a spindle 45 , a motor 47 , a fan 48 and a controller 50 .

[0063] The housing 40 is a hollow box-shaped body. In the present embodiment, the spindle 45, the motor 47, the fan 48 and the controller 50 are accommodated in the housing 40. More specifically, the spindle 45 is accommodated in the lower half of the housing 40. The motor 47, the fan 48 and the controller 50 are accommodated in the upper half of the housing 40. Therefore, in the following description, the lower half of the housing 40 is also referred to as the spindle accommodating portion 41, and the upper half of the housing 40 is also referred to as the motor accommodating portion 42. In addition, since a lubricant is installed in the spindle accommodating portion 41, the spindle accommodating portion 41 and the motor accommodating portion 42 are divided by a partition wall.

[0064] The motor housing portion 42 is in a generally rectangular box shape and includes an upper wall portion 421, a front wall portion 422, left and right side wall portions 423, and a rear wall portion 424. An air inlet 431 for allowing air to flow into the housing 40 is provided at the upper end portion of the motor housing portion 42. More specifically, the air inlet 431 is provided at the upper end portion of each of the side wall portions 423 (that is, a total of two locations). An exhaust port 432 for allowing air to flow out of the housing 40 is provided at the lower end portion of the motor housing portion 42. More specifically, the exhaust port 432 is provided at the lower end portion of each of the front wall portion 422 and the side wall portion 423 (that is, a total of three locations).

[0065] The spindle 45 is supported to be rotatable relative to the housing 40 about the rotation axis R1. The lower end of the spindle 45 protrudes downward from the lower end of the housing 40 (spindle housing 41). The lower end of the spindle 45 has a tool mounting portion 450, which is configured to hold the front end tool 91 in a detachable manner. In addition, the tool mounting portion is also called a chuck, a tool bar, etc. The tool mounting portion 450 holds the front end tool 91 in a manner such that the center axis of the front end tool 91 is consistent with the rotation axis R1.

[0066] The spindle 45 has an insertion hole 455 extending linearly upward along the rotation axis R1 from the lower end of the spindle 45. The insertion hole 455 is configured to receive the positioning pin 92. The positioning pin 92 is a well-known component for aligning the rotation axis R1 of the spindle 45, and more specifically, the center of the hole formed in the workpiece 99 by the tip tool 91, with a desired point on the workpiece 99. The positioning pin 92 is inserted through and held in the through hole 911 of the tip tool 91, and can be moved linearly along the central axis of the tip tool 91.

[0067] Since it is a well-known structure, it is omitted from the figure, but a container storing cutting fluid can be selectively installed on the magnetic drilling machine 1A, and a flow path for supplying cutting fluid to the front end tool 91 is formed inside the spindle 45. When the positioning pin 92 is pressed against the workpiece 99 and moves upward, the flow path is opened, and the cutting fluid is supplied to the front end tool 91 through the flow path.

[0068] The motor 47 is connected to the main shaft 45 in an operable manner and is configured to drive the main shaft 45 to rotate. In the present embodiment, the output shaft 471 of the motor 47 extends parallel to the main shaft 45. The lower end of the output shaft 471 protrudes into the main shaft accommodating portion 41, and a driving gear is formed in this portion. The driving gear meshes with a driven gear fixed to the upper end of the main shaft 45. The driving gear and the driven gear constitute a gear train for speed reduction.

[0069] The fan 48 is fixed to the output shaft 471 below the stator of the motor 47, and rotates integrally with the output shaft 471. The fan 48 is located in the lower end of the motor housing portion 42, and the exhaust port 432 is arranged on the radially outer side of the fan 48. When the fan 48 rotates as the motor 47 is driven, an air flow is generated that flows into the motor housing portion 42 through the air inlet 431 and flows out of the motor housing portion 42 through the exhaust port 432. The air flowing in from the air inlet 431 cools the motor 47 while flowing toward the exhaust port 432.

[0070] The controller 50 is a control device configured to control the operation of the magnetic drilling machine 1A. The controller 50 controls the drive of the motor 47 based on the on / off state of a motor switch (not shown) manually operated by a user. The controller 50 is arranged above the motor 47 and below the air inlet 431 (or at a position substantially the same as the air inlet 431 in the vertical direction). Therefore, the air flow generated by the fan 48 can also cool the controller 50.

[0071] In addition, the motor 47 and / or the controller 50 do not necessarily need to be accommodated in the housing 40 as in the above example, and may be accommodated inside the main body 3, for example.

[0072] Next, the detailed structure of the battery mounting portion 33 will be described.

[0073] like Figure 2 and Figure 3 As shown, the battery mounting portion 33 is provided at the rear of the main body 3. The battery mounting portion 33 includes a receiving recess 34 for partially inserting the battery 93. More specifically, the receiving recess 34 is defined by a bottom surface, left and right side surfaces, and a front surface, and is open at the top. The depth of the receiving recess 34 is configured so that when the battery 93 is inserted into the receiving recess 34, it covers approximately half of the length direction of the battery 93.

[0074] In addition, if Figure 3 and Figure 4 As shown, the battery mounting portion 33 includes a pair of rails 341 , a locking recess 344 , and a terminal portion 347 .

[0075] like Figure 4 As shown, the rails 341 are respectively provided on the side wall portions defining the left and right sides of the accommodating recess 34, and extend substantially parallel to each other in the up-down direction. The rails 341 are configured to be slidably engaged with the groove 931 of the battery 93. With such a configuration of the rails 341, the battery 93 is mounted on the battery mounting portion 33 in a manner that the length direction of the battery 93 is substantially consistent with the up-down direction of the magnetic drilling machine 1A.

[0076] Therefore, the moving direction of the battery 93 when installing the battery 93 (hereinafter referred to as the battery installation direction) is the direction from the upper side to the lower side in the vertical direction. The moving direction of the battery 93 when removing the battery 93 (hereinafter referred to as the battery removal direction) is the direction from the lower side to the upper side in the vertical direction.

[0077] Assuming that the installation and removal directions of the battery 93 are the front-to-back direction and the left-to-right direction, when there is a wall around the magnetic drilling machine 1A (front, back, left, right), the battery 93 will hit the wall and cannot be properly moved. Therefore, the battery 93 cannot be installed or removed relative to the battery mounting portion 33. In contrast, the magnetic drilling machine 1A is in a state where the contact surface 211 on the lower side of the magnetic base 2 is in contact with the workpiece 99 (refer to Figure 3 ), so there is a low possibility that there is a wall above the battery mounting portion 33. Therefore, by defining the mounting direction and removal direction of the battery 93 as described above, even if there is a wall around the magnetic drilling machine 1A, the battery 93 can be easily mounted and removed.

[0078] like Figure 3 As shown, the locking recess 344 is provided at the upper end of the front wall portion defining the front surface of the accommodating recess 34. The locking recess 344 is configured to engage with the locking member 934 when the locking member 934 of the battery 93 is located at the protruding position. When installing the battery 93, the user slides the battery 93 in the installation direction in a state where the locking member 934 is arranged on the upper side and the rail 341 is engaged with the groove 931. When the battery 93 reaches the specified position, the locking member 934 temporarily moved to the retreat position is reset to the protruding position, and is engaged with the locking recess 344 and locked. As a result, the battery 93 is maintained at the specified position.

[0079] like Figure 3 and Figure 4As shown, the terminal portion 347 is supported below the locking recess 344 at the front wall portion of the accommodating recess 34. The terminal portion 347 includes a terminal 348 that can be electrically connected to the terminal of the terminal portion 937 of the battery 93 and a supporting member 349 that supports the terminal 348. The supporting member 349 is supported by the main body 3. As described above, according to the battery 93 being arranged at a predetermined position of the battery mounting portion 33, the terminal of the battery 93 is electrically connected to the terminal 348.

[0080] In addition, if Figure 2 , Figure 3 and Figure 5 As shown in FIG. 1 , the main body 3 is provided with a cover 35 configured to cover the battery mounting portion 33. The cover 35 is configured to be able to be in a closed position (see FIG. 1 ) covering the opening 340 at the upper end of the storage recess 34. Figure 2 , Figure 3 , Figure 5 ) and the opening position of the opening 340 in a manner that enables the installation and removal of the battery 93 (see Figure 6 , Figure 7 ) between. More specifically, the cover 35 is supported on the main body 3 so as to be rotatable around a rotation axis R3 extending in the left-right direction of the main body 3.

[0081] like Figure 2 and Figure 3 As shown, the cover 35 of the present embodiment is configured to substantially block the entire opening 340 of the storage recess 34 (substantially cover the entire storage recess 34) when located in the closed position. In addition, "the cover 35 substantially blocks the entire opening 340" means that the substantially entire edge of the cover 35 is in contact with the main body 3, but it may also include a mode in which the edge is slightly separated from the main body 3. As described above, approximately half of the battery 93 mounted on the battery mounting portion 33 protrudes upward from the storage recess 34 in the longitudinal direction and is exposed to the outside of the storage recess 34. The cover 35 is configured to substantially cover the entire exposed portion of the battery 93 without interfering with the exposed portion of the battery 93 when arranged in the closed position.

[0082] In addition, as described above, the battery 93 moves in the up-down direction relative to the battery mounting portion 33 during installation and removal. Figure 6 and Figure 7 As shown, the cover 35 is configured to ensure a space required for mounting and removing the battery 93 above the battery mounting portion 33 when the cover 35 is arranged in the open position.

[0083] In addition, the cover 35 has a locking member 353, which is configured to lock the cover 35 to the main body 3 in the closed position. The locking member 353 is provided in the edge of the cover 35, which is in contact with the main body 3 at a position substantially farthest from the rotation axis R3 of the cover 35. The locking member 353 of the present embodiment is a rotatable hook-shaped member that can be engaged with the main body 3. The locking member 353 is configured to lock the cover 35 so that it cannot rotate to the open position by engaging with the main body 3 when the cover 35 is arranged in the closed position. In addition, the structure for locking the cover 35 to the main body 3 in the closed position is not limited to the locking member 353, and can be appropriately changed. For example, the cover 35 can also be locked to the main body 3 in the closed position by engaging based on a buckle.

[0084] When the magnetic drilling machine 1A is used for drilling, metal chips are easily scattered. In contrast, by placing the cover 35 in the closed position, the possibility of chips entering the battery mounting portion 33 and adhering to the terminal 348 of the terminal portion 347 can be reduced. In particular, in this embodiment, since the cover 35 substantially blocks the opening 340 of the accommodating recess 34, chips from any direction can be prevented from entering the accommodating recess 34. As a result, the possibility of chips adhering to the terminal portion 347 and causing a bad situation can be reliably reduced.

[0085] In addition, the cover 35 disposed in the closed position can reduce the possibility that some impact is applied to the battery 93 from the outside and the battery 93 and / or the terminal portion 347 are damaged.

[0086] Furthermore, in the present embodiment, the cover 35 is prevented from rotating from the closed position to the open position by the locking member 353. Thus, when the magnetic drilling machine 1A is in a posture in which the front end of the spindle 45 faces the direction opposite to the gravity direction (hereinafter referred to as the upward posture), the cover 35 can reduce the possibility of the battery 93 falling off.

[0087] It should be noted that the cover 35 does not necessarily need to completely block the opening 340 as in the present embodiment. Specifically, the cover 35 is configured to overlap at least the entire terminal portion 347 when viewed from the upper side when arranged in the closed position, preferably overlap the entire battery mounting portion 33 (the entire battery 93 mounted on the battery mounting portion 33). Since the magnetic drilling machine 1A is often used in a posture in which the front end of the spindle 45 faces the direction of gravity (hereinafter referred to as the downward posture), according to this structure, at least the possibility of chips falling from the upper side of the cover 35 toward the terminal portion 347 can be reduced.

[0088] In addition, the cover 35 may be supported by the main body 3 so as to be slidable between the closed position and the open position, for example. Alternatively, the cover 35 may be detachable from the main body 3 (completely separable from the main body 3).

[0089] The battery mounting portion 33 does not necessarily need to include the storage recess 34, and may include only the rail 341, the locking recess 344, and the terminal portion 347. In this case, since the exposed portion of the battery 93 becomes larger, the cover 35 is preferably configured to substantially cover the entire exposed portion of the battery 93.

[0090] The magnetic drilling machine 1A of this embodiment only needs to attract and fix the workpiece 99 to the contact surface 211 by selectively applying magnetic force to the workpiece 99 , and the type of magnet 20 used and / or the method of switching the strength of the magnetic force are not particularly limited.

[0091] For example, the magnet 20 may also be an electromagnet, and the controller 49 may also switch between the fixed state and the non-fixed state by controlling the power supply and power stop of the electromagnet. In addition, the controller 49 may also control the strength of the magnetic force acting on the workpiece 99. In the case of an electromagnet, the manual operating member 25 may also be an information input device (e.g., a push button switch, a touch screen, etc.) electrically connected to the controller 49. In addition, the manual operating member 25 may also be arranged on the magnetic base 2 instead of being arranged on the main body 3.

[0092] The correspondence between each component (feature) of the present embodiment and each component (feature) of the present disclosure or invention is shown below. However, each component of the embodiment is only an example and does not limit each component of the present disclosure or the present invention.

[0093] The magnetic drill 1A is an example of a “magnetic drill”. The magnetic base 2 is an example of a “magnetic base”. The main body 3 is an example of a “main body”. The drill unit 4 and the spindle 45 are examples of a “drill unit” and a “spindle”, respectively. The battery mounting portion 33 and the battery 93 are examples of a “battery mounting portion” and a “battery”, respectively. The track 341 and the terminal portion 347 are examples of a “track” and a “terminal portion”, respectively. The closed position and the open position of the cover 35 are examples of a “first position” and a “second position”, respectively. The accommodating recess 34 and the opening 340 are examples of a “recess” and a “opening”, respectively. The locking member 353 is an example of a “locking member”. The battery mounting portion 33 is an example of a “battery accommodating portion”. The track 30 is an example of a “guiding portion”. The rack 44 is an example of a “guided portion”.

[0094] <Second Embodiment>

[0095] Below, refer to Figure 8 to Figure 10 , a magnetic drilling machine 1B according to an exemplary second embodiment will be described.

[0096] like Figure 8As shown, the magnetic drilling machine 1B of the second embodiment is different from the magnetic drilling machine 1A of the first embodiment in that it has an exhaust nozzle 7, but the other structures are substantially the same as the magnetic drilling machine 1A. Therefore, in the following description, the description of the substantially same structure as the first embodiment is omitted or simplified. In addition, in the present disclosure, when the same reference numerals are used for the components of the magnetic drilling machine between multiple drawings, it means that these components have the same (not necessarily strictly the same) structure.

[0097] like Figure 8 and Fig. 9 As shown, the exhaust nozzle 7 of the present embodiment includes a hose 71 , a connector 73 connected to one end of the hose 71 , and a nozzle portion 75 connected to the other end of the hose 71 .

[0098] The hose 71 is a tubular member that is at least partially flexible. In the present embodiment, the hose 71 adopts a so-called flexible joint hose. The flexible joint hose is a well-known hose composed of a plurality of synthetic resin parts connected to each other via a spherical surface. The flexible joint hose can freely change the overall shape by changing the angle between adjacent parts, and can maintain a curved shape. In addition, the parts can also be connected in a detachable manner.

[0099] The connector 73 is configured to be detachably connected to the exhaust port 432 (see Figure 8 ) engage. In more detail, the connector 73 includes a cylindrical portion 731 having an internal space connected to the flow path in the hose 71 and two locking pieces 735 protruding from the cylindrical portion 731. The end 732 on the opposite side of the connection end of the hose 71 in the cylindrical portion 731 is formed into a flat cylindrical shape that matches the exhaust port 432. The locking pieces 735 protrude from both ends of the end 732 in the longitudinal direction toward the axial direction of the cylindrical portion 731. The locking pieces 735 can bend in a direction of approaching each other and in a direction of separation (in the longitudinal direction of the end 732). A protrusion (claw) 736 protruding in a direction of separation from each other is provided at the front end of each of the locking pieces 735.

[0100] like Fig.10 As shown, the locking piece 735 is inserted into the exhaust port 432, and the protrusion 736 is locked to the inner surface of the shell 40 at a position adjacent to both ends of the exhaust port 432 in the length direction, so that the connector 73 is installed and retained in the shell 40, and further, the exhaust nozzle 7 is installed and retained in the shell 40.

[0101] The nozzle 75 is a cylindrical member having an internal space communicating with the flow path in the hose 71 and an exhaust port 751 for exhausting the air guided from the exhaust port 432. The nozzle 75 is formed into a tapered shape so that the air can be easily sprayed at a specific position.

[0102] In addition, in the present embodiment, the connection between the connector 73 and the part of the hose 71 (flexible joint hose) is similarly connected to a part of the hose 71 via a spherical surface. Therefore, the user can freely change the direction of the connector 73 relative to the hose 71. In addition, the connector 73 is connected to the hose 71 in a detachable manner. Therefore, by replacing the connector 73, the user can use the exhaust nozzle 7 not only for the magnetic drilling machine 1B, but also for a magnetic drilling machine having an exhaust port of a different shape. The nozzle part 75 is also configured to be replaceable in the same manner as the connector 73.

[0103] As described in the first embodiment, in the magnetic drilling machine 1B, the cutting fluid can also be supplied from the container to the front end tool 91 through the flow path inside the spindle 45. However, the cutting fluid can be properly supplied from the container only when the magnetic drilling machine 1B is in a downward posture or a posture close to the downward posture. In contrast, the exhaust nozzle 7 can effectively cool the front end tool 91 using the air flowing out of the exhaust port 432 regardless of the posture of the magnetic drilling machine 1B.

[0104] In addition, the exhaust nozzle 7 can be removed from the exhaust port 432, for example, when the cutting fluid supplied from the container can be used and when the magnetic drill 1B is not in use (for example, when transporting or storing). In addition, the exhaust nozzle 7 can be selectively connected to one of the multiple exhaust ports 432 of the magnetic drill 1B. Therefore, for example, in the presence of an obstacle (for example, a wall) adjacent to the magnetic drill 1B, the user can install the exhaust nozzle 7 in the exhaust port 432 located at a position that does not interfere with the obstacle. In addition, the connection method of the exhaust nozzle 7 relative to the exhaust port 432 is not limited to the above-mentioned example, for example, it can also be changed to screwing in with a thread, snapping in with a bayonet structure, etc.

[0105] In addition, in this embodiment, since the hose 71 adopts a flexible joint hose, there is an advantage that the exhaust nozzle 7 can stably guide the air to a desired position. However, the hose 71 may also adopt a general metal or synthetic resin flexible hose instead of the flexible joint hose. In this case, the flexible hose is also preferably able to maintain its shape.

[0106] In the case where the hose 71 cannot maintain its shape, a nozzle holder may be provided at the lower end of the spindle housing 41. The nozzle holder is configured to be detachably connected to the nozzle portion 75 or the hose 71, and to hold the nozzle portion 75 or the hose 71 in an appropriate position. In addition, the nozzle holder may be detachable from the spindle housing 41. In addition, the holding position of the nozzle portion 75 or the hose 71 in the circumferential direction centered on the rotation axis R1 may be changed.

[0107] In the present embodiment, an example in which the exhaust nozzle 7 is mounted on one exhaust port 432 is described, but the exhaust nozzle 7 may also be configured to cover a plurality of exhaust ports and to be connected to at least one of the plurality of exhaust ports. In this case, the front end tool 91 can be cooled by air flowing into the exhaust nozzle from the plurality of exhaust ports. In addition, the positions and numbers of the air inlet 431 and the exhaust port 432 in the present embodiment are merely exemplary and may be appropriately changed.

[0108] In addition, the same changes as those described in the first embodiment may be added to the magnetic drill 1B of this embodiment. In addition, the cover 35 may be omitted from the magnetic drill 1B.

[0109] In view of the gist of the above-mentioned embodiment and its modified examples, the present invention has constructed the following aspects 1 to 6. At least one of the following aspects can be adopted alone or in combination with at least one of the above-mentioned embodiment and its modified examples and the invention described in each claim.

[0110] [Method 1]

[0111] A magnetic drilling machine, characterized by having:

[0112] A magnetic base configured to be selectively fixed to a workpiece using magnetic force;

[0113] A main body connected to the magnetic base; and

[0114] a drill unit supported on the main body so as to be movable in a first direction,

[0115] The drill unit has:

[0116] motor;

[0117] a spindle configured to detachably hold a front end tool and configured to be rotated by the motor around a rotation axis extending in the first direction;

[0118] a fan configured to be rotated by the motor;

[0119] A housing for accommodating the motor, the spindle and the fan, wherein the housing has at least one air inlet and at least one air outlet;

[0120] The exhaust nozzle comprises a tubular portion which is at least partially flexible and is connected to at least one of the exhaust ports.

[0121] According to this aspect, the air that flows into the housing through the air inlet and flows out of the exhaust port due to the rotation of the fan can be discharged through the exhaust nozzle connected to the exhaust port and used for cooling the tip tool.

[0122] [Method 2]

[0123] The magnetic drilling machine according to method 1 is characterized in that:

[0124] The exhaust nozzle is detachably connected to at least one of the exhaust ports.

[0125] According to this aspect, when the cutting fluid supplied from the container can be used and when the magnetic drill is not used, the exhaust nozzle can be removed, thereby improving convenience.

[0126] [Method 3]

[0127] The magnetic drilling machine according to method 2 is characterized in that:

[0128] At least one of the exhaust ports includes a plurality of exhaust ports arranged at different positions in a circumferential direction of the main shaft with the rotation axis as the center.

[0129] The exhaust nozzle is selectively connectable to one of the plurality of exhaust ports.

[0130] According to this aspect, the user can connect the exhaust nozzle to an appropriate position for use according to the working environment of the magnetic drill (for example, adjacent obstacles), thereby improving convenience.

[0131] [Method 4]

[0132] The magnetic drilling machine according to method 2 or method 3 is characterized in that:

[0133] The exhaust nozzle is configured to be connectable to at least one of the exhaust ports without using any additional auxiliary equipment.

[0134] According to this mode, the user can easily connect the exhaust nozzle to the exhaust port. In addition, as a connection method of the exhaust nozzle to the exhaust port, for example, a buckle using a flexible locking piece, screwing, or engagement using a bayonet structure can be adopted.

[0135] [Method 5]

[0136] The magnetic drilling machine according to any one of the second to fourth aspects, characterized in that:

[0137] The exhaust nozzle comprises: a connector configured to be detachably connected to at least one of the exhaust ports; and a nozzle portion having an exhaust port.

[0138] At least one of the connector and the nozzle portion is detachably connected to the tubular portion.

[0139] According to this aspect, the user can replace the connector and / or the nozzle portion according to the structure of the exhaust port of the magnetic drill, the size of the desired exhaust port, etc., thereby improving convenience.

[0140] [Method 6]

[0141] The magnetic drilling machine according to any one of the first to fifth aspects, characterized in that:

[0142] The tubular portion is configured to maintain a shape in a bent state.

[0143] According to this aspect, the exhaust nozzle can stably guide the air to a desired position.

[0144] The present disclosure also provides the following modes A1 to A13 and exemplary third and fourth embodiments for a non-limiting purpose of being able to determine whether the magnetic drilling machine is in a stable state.

[0145] [Method A1]

[0146] A magnetic drilling machine, wherein:

[0147] motor;

[0148] A drill unit including at least a main shaft, the main shaft being configured to hold a front end tool in a detachable manner and configured to be driven by the motor to rotate around a first axis;

[0149] a main body portion supporting the drill unit so as to be movable in a first direction parallel to the first axis;

[0150] a magnetic base connected to the main body and selectively fixed to the workpiece by magnetic force; and

[0151] The sensor is configured to detect at least one of information corresponding to the falling of the magnetic drill, information corresponding to the vibration of the drill unit, and information corresponding to the posture of the magnetic drill.

[0152] The magnetic drill of this embodiment can detect at least one of the information corresponding to the drop of the magnetic drill, the information corresponding to the vibration of the drill unit, and the information corresponding to the posture of the magnetic drill by using a sensor. This information is useful information indicating whether the magnetic drill is in a stable state. Therefore, by effectively using the information detected by the sensor, it can contribute to the improvement of the magnetic drill.

[0153] [Method A2]

[0154] The magnetic drilling machine according to embodiment A1 is characterized in that it also comprises:

[0155] a control device configured to control the operation of the magnetic drilling machine based on information detected by the sensor,

[0156] The control device is configured to stop driving the motor when the information indicates that the magnetic drill has fallen.

[0157] According to this aspect, it is possible to prevent the front end tool from being rotationally driven in a state where the magnetic drill is separated from the workpiece due to falling. In addition, the control device can be embodied by, for example, at least one processor / processing circuit and a memory.

[0158] [Method A3]

[0159] The magnetic drilling machine according to Mode A1 or Mode A2 is characterized in that it also has:

[0160] a control device configured to control the operation of the magnetic drilling machine based on information detected by the sensor,

[0161] The control device is configured to stop driving the motor when the information indicates that the vibration of the drill unit exceeds a predetermined threshold value.

[0162] Since the drill unit is supported on the main body so as to be movable in the first direction, for example, unexpected looseness due to loose connection of the support structure caused by operation may cause vibration of the drill unit. The greater the vibration, the more the accuracy of the hole formed by the front end tool tends to decrease. According to this embodiment, since the drive of the motor is stopped when the vibration becomes severe to a certain extent, the user can check the looseness of the support structure and take necessary measures.

[0163] [Mode A4]

[0164] The magnetic drilling machine according to any one of Modes A1 to A3, further comprising:

[0165] a control device configured to control the operation of the magnetic drilling machine based on information detected by the sensor,

[0166] The sensor can detect, as the posture of the magnetic drilling machine, a first posture when the magnetic base is placed on a workpiece and a second posture different from the first posture.

[0167] The control device is configured to control the operation of the magnetic drill in a manner different from that in a manner when the information indicates that the magnetic drill is in the second posture when the information indicates that the magnetic drill is in the first posture.

[0168] When the magnetic drill is in the first posture where the magnetic base is placed on the workpiece (supported by the workpiece), it can be said that it is in a stable state compared to the other postures. Therefore, by making the action control different when the magnetic drill is in the first posture and when the control device is in the second posture, reasonable control can be achieved.

[0169] [Mode A5]

[0170] The magnetic drilling machine according to embodiment A4 is characterized in that it also has:

[0171] The first detector is configured to detect the fixing member connecting the main body or the magnetic base with the workpiece when the fixing member is mounted on the main body or the magnetic base.

[0172] The control device is configured as follows:

[0173] When the information indicates that the magnetic drilling machine is in the first posture, the motor is driven regardless of the detection result of the first detector, and

[0174] When the information indicates that the magnetic drilling machine is in the second posture, the motor is driven on the condition that the first detector detects the fixing member.

[0175] The fixing member is an auxiliary device for preventing the magnetic drill from being separated from the workpiece. In this method, when the magnetic drill is in the second posture, the motor is not driven unless the fixing member is installed, thereby preventing the magnetic drill from being driven in an unstable state. In addition, the first detector can be, for example, a micro switch or a load sensor.

[0176] [Mode A6]

[0177] The magnetic drilling machine according to any one of Modes A1 to A5, further comprising:

[0178] The indicator is configured to notify detection information detected by the sensor or information based on the detection information.

[0179] According to this aspect, the user can easily recognize the state of the magnetic drilling machine based on the information notified by the indicator and take appropriate measures.

[0180] [Mode A7]

[0181] The magnetic drilling machine according to any one of Modes A1 to A6 is characterized in that:

[0182] The sensor is an acceleration sensor or an angular velocity sensor.

[0183] According to this aspect, at least one of information corresponding to the drop of the magnetic drill, information corresponding to the vibration of the drill unit, and information corresponding to the posture of the magnetic drill can be detected using an existing easily available sensor.

[0184] [Mode A8]

[0185] The magnetic drilling machine according to method A7 is characterized in that:

[0186] The sensor is a single (only one) acceleration sensor, and is configured to detect information corresponding to the falling of the magnetic drill, information corresponding to the vibration of the drill unit, and information corresponding to the posture of the magnetic drill.

[0187] According to this aspect, compared with a case where each piece of information is detected by a different sensor, a plurality of types of information useful for controlling the magnetic drilling machine can be detected with a small number of components.

[0188] [mode A9]

[0189] The magnetic drilling machine according to any one of Modes A1 to A8, further comprising:

[0190] a control device configured to control the operation of the magnetic drilling machine based on information detected by the sensor,

[0191] The apparatus further comprises: a second detector configured to detect that the front end tool held on the spindle is within a predetermined distance from the workpiece;

[0192] The control device is configured to drive the motor at a predetermined first speed in response to the second detector detecting that the tip tool is within the predetermined distance from the workpiece.

[0193] According to this aspect, the motor can be driven at a rotation speed suitable for the machining work in response to the movement of the drill unit so that the tip tool approaches the workpiece and is arranged within a predetermined distance.

[0194] [mode A10]

[0195] The magnetic drilling machine according to mode A9 is characterized in that it also has:

[0196] The motor switch is configured to be manually operated by a user.

[0197] The control device is configured to start driving the motor at a second speed lower than the first speed in response to the motor switch being turned on, and then change the rotation speed of the motor to the first speed in response to the second detector detecting that the front end tool is within the specified distance from the workpiece.

[0198] According to this aspect, it is possible to suppress wasteful power consumption compared to the case where the motor starts to be driven at the first speed immediately after the switch is turned on. In addition, the first speed only needs to be higher than the second speed, but is preferably the maximum speed of the motor.

[0199] [mode A11]

[0200] The magnetic drilling machine according to Mode A9 or Mode A10 is characterized in that:

[0201] The spindle has an insertion hole extending along the first axis and configured to receive a portion of a positioning pin held by the front end tool so as to be movable along the first axis.

[0202] The second detector is a load sensor disposed in the insertion hole of the main shaft so as to receive the load from the positioning pin.

[0203] The positioning pin is a well-known component used to align the rotation axis of the spindle of the magnetic drilling machine with the desired position, and is detachably held on the front end tool for use. According to this embodiment, the load sensor can detect that the front end tool is within a specified distance from the workpiece based on the load received from the positioning pin.

[0204] [mode A12]

[0205] The magnetic drilling machine according to method A9 or 10 is characterized in that:

[0206] The second detector is a distance measuring sensor or a non-contact sensor disposed in the drill unit.

[0207] According to this aspect, it is possible to detect, with a simple configuration, that the tip tool is within a predetermined distance from the workpiece.

[0208] [mode A13]

[0209] A magnetic drilling machine, wherein:

[0210] motor;

[0211] a drill unit including at least a main shaft, the main shaft being configured to hold a front end tool in a detachable manner and configured to be rotationally driven by the motor;

[0212] a central portion movably supporting the drill unit;

[0213] a magnetic base connected to the central portion and selectively fixed to the workpiece by magnetic force; and

[0214] Acceleration sensor or angular velocity sensor.

[0215] In the magnetic drilling machine of this embodiment, for example, an acceleration sensor or an angular velocity sensor can be used to detect information about the operation or posture of the magnetic drilling machine. This information is useful information indicating whether the magnetic drilling machine is in a stable state. Therefore, by effectively using the information detected by the acceleration sensor or the angular velocity sensor, it can contribute to the improvement of the magnetic drilling machine.

[0216] <Third Embodiment>

[0217] Reference Figure 11 to Figure 14 , a magnetic drilling machine 1C involved in an exemplary third embodiment is described. In addition, a part of the structure of the magnetic drilling machine 1C is substantially the same as the magnetic drilling machine 1A of the first embodiment. Therefore, in the following description, the description of the structure substantially the same as that of the first embodiment is omitted or simplified. In addition, this point is also the same for the fourth embodiment described later.

[0218] like Fig.11 and Fig.12 As shown, similar to the magnetic drill 1A of the first embodiment, the magnetic drill 1C includes: a magnetic base 2 configured to be selectively fixed to a workpiece by magnetic force; a main body 3 connected to the magnetic base 2; and a drill unit 4 supported by the main body 3.

[0219] The main body 3 has a battery mounting portion 33, which is configured to receive a battery 93 in a detachable manner. The battery 93 is, for example, a rechargeable battery that can be used in various electric tools other than the magnetic drill 1C. In the present embodiment, the battery mounting portion 33 is disposed at the rear end of the main body 3 and is configured to mount the battery 93 from above. However, the mounting direction of the battery 93 may also be other directions. In addition, the magnetic drill 1C may also be configured to operate not by the battery 93 but by power supplied from an external commercial power source via a power cord.

[0220] like Fig.13 As shown, in this embodiment, in the up-down direction, a gap (passage) extending in the left-right direction is ensured between a part of the main body 3 and a part of the magnetic base 2. The gap is a groove 37 for the fixing member 95 to pass through. The fixing member 95 of this embodiment is a long and thin belt, but in addition, for example, a chain may be used. The fixing member 95 passes through the groove 37 and is fastened around the magnetic base 2 and the workpiece, so that the magnetic drilling machine 1C is reliably connected to the workpiece in a manner that cannot be separated.

[0221] The magnetic drill press 1C can be used by placing the contact surface 211 of the magnetic base 2 (further, the front end of the front end tool 91) on the workpiece in a posture (downward posture) facing vertically downward, that is, in the direction of gravity. When the magnetic drill press 1C is in the downward posture, the magnetic drill press 1C is in a stable state and is less likely to fall from the workpiece.

[0222] On the other hand, when the magnetic drill press 1C is used in a posture other than the downward posture, if the magnetic fixation is not performed / the magnetic fixation is insufficient, there is a possibility that the magnetic drill press 1C will fall. In particular, it is necessary to pay attention when the magnetic drill press 1C is used in a posture in which the contact surface 211 is facing the vertical upward direction, that is, the posture opposite to the gravity direction (upward posture), the posture in which the contact surface 211 is roughly parallel to the vertical direction (hereinafter referred to as the vertical posture), or a posture in between. Therefore, when the magnetic drill press 1C is used in the upward posture, the vertical posture, or a posture in between, it is recommended to use the fixing member 95.

[0223] like Fig.13 As shown in FIG. 1 , in this embodiment, a micro switch 53 is arranged on the upper surface of the magnetic base 2 in the groove 37, and the micro switch 53 is configured to detect the installation of the fixing member 95. The micro switch 53 is always kept off, and is configured to be turned on when the fixing member 95 passes through the groove 37 and is fastened around the magnetic base 2 and the workpiece. The micro switch 53 is connected to the controller 50 (see FIG. 1 ) described later. Fig.14 ) is electrically connected to output a signal indicating an on / off state. In addition, a load sensor may be used for the installation detection of the fixing member 95 instead of the micro switch 53.

[0224] like Fig.14 As shown, the drill unit 4 of this embodiment includes a housing 40, a spindle 45, a motor 47, and a controller 50. The spindle 45, the motor 47, and the controller 50 are accommodated in the housing 40.

[0225] The spindle 45 has an insertion hole 455 extending linearly upward along the rotation axis R1 from the lower end of the spindle 45. The insertion hole 455 is configured to receive the positioning pin 92. A spring 456 for applying force to the positioning pin 92 is accommodated in the insertion hole 455. When the front end tool 91 with the positioning pin 92 retained is mounted on the tool mounting portion 450 of the spindle 45, the upper end of the positioning pin 92 is arranged in the insertion hole 455, and the positioning pin 92 is urged downward by the spring 456.

[0226] In the initial state where no upward force is applied to the positioning pin 92, the lower end of the positioning pin 92 protrudes downward from the lower end of the front end tool 91. Therefore, the user can align the magnetic drilling machine 1C with respect to the workpiece using the front end of the positioning pin 92 as a mark. The positioning pin 92 is pressed against the workpiece during the drilling operation and is pushed upward against the force of the spring 456.

[0227] The controller 50 is a control device configured to control the operation of the magnetic drilling machine 1C. The controller 50 includes at least a control circuit mounted on a circuit board. In the present embodiment, the controller 50 is configured by a microcomputer including a CPU and a memory.

[0228] In the present embodiment, the controller 50 is electrically connected to the motor 47 , the motor switch 46 , the acceleration sensor 51 , the micro switch 53 , the load sensor 55 , and the indicator light 59 .

[0229] The motor switch 46 is configured to be manually operated by a user to instruct the start of the motor 47. Fig.11 and Fig.14 As shown, in this embodiment, the motor switch 46 is arranged at the upper end of the housing 40. The motor switch 46 is configured to switch on and off according to the manual operation of the user. The signal indicating the on and off state output from the motor switch 46 is used by the controller 50 to control the start and stop of the drive of the motor 47.

[0230] like Fig.14 As shown, the acceleration sensor 51 is mounted on the housing 40. The acceleration sensor 51 of this embodiment detects information corresponding to the fall of the magnetic drilling machine 1C, information corresponding to the vibration of the drill unit 4, and information corresponding to the posture of the magnetic drilling machine 1C, and outputs corresponding signals. Specifically, the acceleration sensor 51 is a three-axis acceleration sensor that detects accelerations in three mutually orthogonal directions (X axis, Y axis, Z axis). The signal output from the acceleration sensor 51 is used for the controller 50 to control the operation of the magnetic drilling machine 1C, for example, as described below.

[0231] As information corresponding to the fall of the magnetic drilling machine 1C, the acceleration sensor 51 can detect, for example, the accelerations in each of the three directions. When the magnetic drilling machine 1C is in a free fall state, the accelerations in each of the three directions are all zero, and their sum is substantially zero. In this embodiment, if the controller 50 determines that the state in which the sum of the accelerations in the three directions is zero (free fall state) during the drive of the motor 47 has lasted for a predetermined time based on the signal output from the acceleration sensor 51, the drive of the motor 47 is stopped. By such control, it is possible to prevent the front end tool 91 from continuing to be rotated when the magnetic drilling machine 1C is separated from the workpiece.

[0232] In addition, as information corresponding to the vibration of the drill unit 4, the acceleration sensor 51 can detect, for example, acceleration in a direction intersecting the up-down direction. The vibration of the drill unit 4 is typically caused by the loosening of the connection structure between the main body 3 and the drill unit 4. As described above, in the present embodiment, the main body 3 and the drill unit 4 are connected by the sliding engagement of the rail 30 and the rack 44. Generally speaking, the looseness is controlled within the allowable range at the time of shipment. However, as the connection becomes loose with the use of the magnetic drilling machine 1C, if the looseness becomes larger, the vibration mainly in the direction intersecting the up-down direction increases.

[0233] Therefore, in this embodiment, the controller 50 stops the driving of the motor 47 when it is determined that the vibration in a predetermined direction (e.g., left-right direction) intersecting the vertical direction exceeds a predetermined threshold value during the driving of the motor 47 based on the signal output from the acceleration sensor 51. By such control, it is possible to prevent the magnetic drilling machine 1C from continuing to operate in an unstable state. In addition, it is possible to prevent the shape and size of the hole formed by the front end tool 91 from being greatly changed from the original shape and size due to vibration.

[0234] In addition, as information corresponding to the posture of the magnetic drill press 1C, the acceleration sensor 51 can detect the pitch angle or the angle of the rotation axis R1 relative to the gravity direction. The controller 50 can determine the posture of the magnetic drill press 1C based on the signal output from the acceleration sensor 51. As described above, if the fixing member 95 is not installed when the magnetic drill press 1C is used in an upward posture or a vertical posture, the possibility of falling increases. It can be determined whether the fixing member 95 is installed based on the detection result of the micro switch 53.

[0235] Therefore, in the present embodiment, when the controller 50 determines that the magnetic drill press 1C is in the downward position, regardless of the detection result of the micro switch 53, the controller 50 starts driving the motor 47 according to the motor switch 46 being set to the on state. On the other hand, when the controller 50 determines that the magnetic drill press 1C is in a position other than the downward position (for example, the upward position, the vertical position), the controller 50 drives the motor 47 only when it is determined that the fixing member 95 is installed based on the signal output from the micro switch 53. That is, when the magnetic drill press 1C is in a position other than the downward position and the fixing member 95 is not installed, the controller 50 does not drive the motor 47 even if the motor switch 46 is turned on. Therefore, it is possible to prevent the magnetic drill press 1C from being driven in an unstable state.

[0236] In this embodiment, only one acceleration sensor 51 is used to detect three types of information corresponding to the drop of the magnetic drill 1C, the vibration of the drill unit 4, and the posture of the magnetic drill 1C, and used for the operation control of the magnetic drill 1C. Therefore, compared with the case where each information is detected by another sensor, information useful for controlling the magnetic drill 1C can be detected with a smaller number of components.

[0237] like Fig.14 As shown in FIG. 1 , the load sensor 55 is mounted inside the insertion hole 455 of the spindle 45. More specifically, the load sensor 55 is arranged on the upper side of the spring 456 in the upper end of the insertion hole 455. The load sensor 55 receives a load when the positioning pin 92 is pressed against the workpiece and the spring 456 is compressed. The load detected by the load sensor 55 increases as the positioning pin 92 moves upward, that is, as the distance between the front end of the front tool 91 and the workpiece in the vertical direction decreases.

[0238] Therefore, the controller 50 drives the motor 47 at an initial speed lower than the maximum speed when it is determined that the detected load is lower than a predetermined threshold value, that is, the distance between the tip tool 91 and the workpiece is farther than a predetermined distance, based on the signal output from the load sensor 55. When the load detected by the load sensor 55 becomes greater than a predetermined threshold value, that is, when the tip tool 91 approaches the workpiece to a predetermined distance, the controller 50 increases the rotation speed of the motor 47 and drives the motor 47 at the maximum speed. The threshold value of the load is preferably set to, for example, the load detected by the load sensor 55 when the tip of the tip tool 91 is arranged 1 to 2 centimeters (cm) above the workpiece.

[0239] It should be noted that the magnetic drilling machine 1C can selectively mount a plurality of types of tip tools 91 having different axial lengths, but the load sensor 55 can detect when the tip tool 91 approaches a workpiece to a predetermined distance regardless of the length of the tip tool 91 .

[0240] According to such control, after the user turns on the motor switch 46, while the handle 32 is operated to lower the drill unit 4, the rotation speed of the motor 47 is maintained at a low speed until the front end tool 91 reaches a predetermined distance from the workpiece. Therefore, it is possible to suppress useless power consumption. In particular, when the battery 93 is used as a power source as in the present embodiment, there is an advantage that the operating time of the battery 93 can be extended. In addition, while the front end tool 91 approaches the workpiece to a predetermined distance, the front end tool 91 rotates at a low speed, so the rotation speed of the front end tool 91 can be efficiently increased to the maximum speed at the moment of approaching the predetermined distance.

[0241] Instead of the above control, the controller 50 may not start driving the motor 47 until the tip tool 91 reaches a predetermined distance from the workpiece. In this case, compared with the case of low-speed driving, it is advantageous in that power consumption can be further reduced. In addition, a plurality of loads corresponding to different distances between the tip tool 91 and the workpiece may be set in stages in advance, and the controller 50 may increase the rotation speed of the motor 47 in stages according to the detected loads.

[0242] It should be noted that the load sensor 55 can indirectly detect that the distance between the front end of the front end tool 91 and the workpiece is less than a predetermined distance by detecting the load received from the positioning pin 92. Alternatively, a contact switch may be arranged in the insertion hole 455 of the spindle 45, and when the distance between the front end of the front end tool 91 and the workpiece is less than a predetermined distance, the plunger of the switch is actuated by the upper end of the positioning pin 92.

[0243] The indicator light 59 is a device for notifying the user of information indicating the status of the magnetic drilling machine 1C. Fig.11 As shown, the indicator light 59 of the present embodiment is arranged on the upper surface of the housing 40. The indicator light 59 is composed of an LED, and is switched between a lit state and an off state by the controller 50. The indicator light 59 is lit, for example, when an abnormality occurs in the magnetic drilling machine 1C and the user needs to be urged to respond. Specifically, as described above, the indicator light is lit when the motor 47 stops due to the drop of the magnetic drilling machine 1C or the vibration of the drill unit 4, and when the fixing member 95 is not installed. In addition, when there are multiple pieces of information to be notified, multiple LEDs can also be provided corresponding to each piece of information.

[0244] <Fourth Embodiment>

[0245] Below, refer to Fig.15 A magnetic drilling machine 1D according to an exemplary fourth embodiment will be described.

[0246] The magnetic drill press 1D of the fourth embodiment is different from the magnetic drill press 1C of the third embodiment in that the magnetic drill press 1D has a distance sensor 57 and a distance setting button 58 instead of the load sensor 55, but the other structures are substantially the same as the magnetic drill press 1C. Therefore, in the following description, the description of the same structure as the third embodiment is omitted.

[0247] The distance sensor 57 is mounted downward on the housing 40 of the drill unit 4. For example, a photoelectric sensor can be used as the distance sensor 57. The distance sensor 57 is electrically connected to the controller 50, and outputs a signal indicating the distance between the distance sensor 57 and the workpiece.

[0248] If the motor switch 46 is turned on, the controller 50 starts driving the motor 47. Specifically, the controller 50 drives the motor 47 at an initial speed lower than the maximum speed during a period in which the controller 50 determines that the detected distance is longer than the prescribed reference distance based on the signal output from the distance measuring sensor 57. Alternatively, the controller 50 does not start driving the motor 47 during a period in which the controller 50 determines that the detected distance is longer than the prescribed reference distance. When the distance detected by the distance measuring sensor 57 is less than the reference distance, the controller 50 increases the rotation speed of the motor 47 and drives the motor 47 at the maximum speed. In addition, the reference distance is preferably set to, for example, the distance between the distance measuring sensor 57 and the workpiece when the front end of the front end tool 91 is arranged 1 to 2 cm above the workpiece.

[0249] The distance setting button 58 is an operating member that can be manually operated by the user in order to set the above-mentioned reference distance. In the present embodiment, the distance setting button 58 is arranged at the front end portion of the housing 40 in a manner that can be pressed and operated, and is electrically connected to the controller 50. As described above, on the magnetic drilling machine 1D, a plurality of types of front end tools 91 with different axial lengths can be selectively installed. Therefore, reference distances corresponding to the plurality of types of lengths are stored in the memory of the controller 50. By pressing the distance setting button 58, the user can select the type of front end tool 91 actually used and set an appropriate reference distance corresponding thereto. Based on the reference distance set via the distance setting button 58, the controller 50 controls the drive of the motor 47 as described above.

[0250] Furthermore, the magnetic drill 1D may include an indicator (eg, an LED light, a display) for notifying the user of information related to the tip tool 91 selected by the user.

[0251] As described above, in this embodiment, similarly to the third embodiment, after the user turns on the motor switch 46, the motor 47 is maintained in a low-speed driving state or a stopped state while the handle 32 is operated to lower the drill unit 4 until the front end tool 91 approaches the workpiece to a certain extent. Therefore, useless power consumption can be suppressed. In addition, since a reference distance corresponding to the length of the front end tool 91 actually used can be set, the controller 50 can change the rotation speed of the motor 47 at an appropriate time.

[0252] In addition, in the present embodiment, the distance measuring sensor 57 having a relatively long detection distance is adopted in relation to the mounting position in the housing 40. However, in the case where the mounting position can be set at a position further below the drill unit 4, a non-contact sensor having a shorter detection distance than the distance measuring sensor 57 may be adopted. The controller 50 can increase the rotation speed of the motor 47 as described above in response to the detection of the workpiece within the predetermined distance by the non-contact sensor.

[0253] The following shows the correspondence between the components (features) of the third and fourth embodiments and the components (features) of the invention described in the above-mentioned modes A1 to A13. However, the components of the embodiments are only examples and are not limited to the components of the invention described in the above-mentioned modes A1 to A13.

[0254] Magnetic drills 1C and 1D are examples of “magnetic drills”, respectively. Motor 47 is an example of a “motor”. Drill unit 4 and spindle 45 are examples of “drill unit” and “spindle”, respectively. Main body 3 is an example of “main body” and “central part”. Magnetic base 2 is an example of “magnetic base”. Acceleration sensor 51 is an example of a “sensor”. Controller 50 is an example of a “control device”. Micro switch 53 is an example of a “first detector”. Fixing part 95 is an example of a “fixing part”. Indicator light 59 is an example of an “indicator”. Load sensor 55 and distance sensor 57 are examples of “second detector”, respectively. Motor switch 46 is an example of a “motor switch”. Positioning pin 92 is an example of a “positioning pin”. Insertion hole 455 is an example of an “insertion hole”.

[0255] It should be noted that the above-mentioned embodiments are merely examples, and the magnetic drilling machines involved in the embodiments A1 to A13 are not limited to the magnetic drilling machines 1C and 1D illustrated. For example, the following non-limiting changes can be made. In addition, at least one of these changes can be combined with the magnetic drilling machines 1C and 1D illustrated in the embodiments and any one of the inventions described in the above-mentioned embodiments A1 to A13.

[0256] For example, the magnetic base 2 may only be capable of attracting and fixing the workpiece to the contact surface 211 by selectively applying the magnetic force generated by the magnet 20 to the workpiece, and the type of the magnet 20 and / or the method of switching the strength of the magnetic force are not particularly limited.

[0257] For example, the magnet 20 may be an electromagnet, and the controller 50 may switch the fixed state and the non-fixed state by controlling the energization and de-energization of the electromagnet. In addition, the controller 50 may also control the strength of the magnetic force acting on the workpiece.

[0258] When an electromagnet is used instead of magnet 20, manual operating member 25 may be an information input device (eg, a push button switch, a touch screen, etc.) electrically connected to controller 50. Manual operating member 25 may be provided on magnetic base 2 instead of body 3.

[0259] The motor 47 and / or the controller 50 may not be included in the drill unit 4, but may be accommodated inside the main body 3. In addition, the motor switch 46, the indicator light 59, and the distance setting button 58 may also be provided on the main body 3.

[0260] The acceleration sensor 51 may not detect all of the three types of information corresponding to the falling of the magnetic drilling machine 1C, 1D, the vibration of the drill unit 4, and the posture of the magnetic drilling machine 1C, 1D, but may detect only one or two of them. Corresponding to this change, the controller 50 may also perform only the control corresponding to the detected information among the above-mentioned controls. In addition, other sensors may be used instead of the acceleration sensor 51, or in addition to the acceleration sensor 51. For example, an angular velocity sensor (gyro sensor) may also be used as a sensor for detecting information corresponding to the vibration of the drill unit 4.

[0261] The controller 50 may also perform control other than the control exemplified in the embodiment based on the detection results of the acceleration sensor 51 or the sensor of the above-mentioned modification. The following are non-limiting examples of control that can be adopted.

[0262] For example, when the magnetic base 2 is an electromagnet, the controller 50 can control the strength of the magnetic force of the electromagnet according to the posture of the magnetic drill press 1C, 1D detected by the acceleration sensor 51. Specifically, when the magnetic drill press 1C, 1D is detected to be in a posture between the vertical posture and the upward posture, the controller 50 controls the magnetic force to be the strongest. When the magnetic drill press 1C, 1D is detected to be in a downward posture, the controller 50 controls the magnetic force to be smaller.

[0263] Since it is a well-known structure, it is omitted from the illustration, but a container for storing coolant can be installed on the magnetic drilling machine 1C, 1D. However, the container has a premise of being used when the magnetic drilling machine 1C, 1D is in a downward posture, so if it is used in an upward posture or a plumb posture, there is a possibility of coolant leakage. Therefore, the magnetic drilling machine 1C, 1D may also have a detector (for example, a micro switch, a load sensor) for detecting the installation of the container. The controller 50 may also report appropriate information based on the detection results of the detector and the posture of the magnetic drilling machine 1C, 1D detected by the acceleration sensor 51. Specifically, when it is detected that a container is installed and the magnetic drilling machine 1C, 1D is detected to be in a posture between the plumb posture and the upward posture, the controller 50 reports an error. For example, the indicator light 59 can be used for reporting.

[0264] Another non-limiting object of the present disclosure is to provide a magnetic drilling machine with improved convenience, and to provide the following modes B1 to B25 and exemplary fifth to tenth embodiments.

[0265] [Mode B1]

[0266] A magnetic drilling machine, wherein:

[0267] main housing;

[0268] a drill unit having a drill bit and supported by the main housing in a manner capable of relative movement relative to the main housing in a direction in which a rotation axis of the drill bit extends;

[0269] a magnetic base having a permanent magnet and connected to the main housing, wherein the magnetic base is configured to enable the permanent magnet or a yoke disposed near the permanent magnet to be displaced between a first position corresponding to a maximum state and a second position corresponding to a minimum state, so that the magnetic attraction force on the workpiece generated by the magnetic force of the permanent magnet is changed between the maximum state in which the magnetic attraction force is maximum and the minimum state in which the magnetic attraction force is minimum;

[0270] a first operating member, directly or indirectly operatively connected to the permanent magnet or the yoke, for performing a manual operation for changing the magnetic attraction force between the maximum state and the minimum state;

[0271] a second operating member configured to enable manual operation for displacing the permanent magnet or the yoke toward the first position by a single touch; and

[0272] a drive device configured to displace the permanent magnet or the yoke toward the first position and displace the first operating member toward a position corresponding to the maximum state in response to an operation of the second operating member;

[0273] Usually, in order to prevent actions that go against the user's intention, the first operating member is configured to be displaced by an operation that is difficult to perform with a single touch (typically, a rotation operation). Such an operation is easy when the magnetic drill press is used in a downward posture, but when the magnetic drill press is used in a horizontal posture or an upward posture, it is necessary to support the magnetic drill press with the hand while operating the first operating member, so it is not easy. On the other hand, according to the above-mentioned magnetic drill press, even when the magnetic drill press is used in a horizontal posture or an upward posture, the permanent magnet or the yoke can be displaced in the direction in which the magnetic base is magnetically adsorbed to the workpiece by a single touch operation using the hand supporting the magnetic drill press, so that the magnetic base is magnetically adsorbed to the workpiece. Therefore, the convenience of the user is improved. When the second operating member is operated, the permanent magnet or the yoke can be displaced to the first position corresponding to the maximum state, and as long as the magnetic base is magnetically adsorbed to the workpiece, it can also be displaced to a position corresponding to a state between the minimum state and the maximum state.

[0274] For example, the driving device may be an actuator that converts electrical energy into mechanical motion, or may be a mechanical mechanism that converts the displacement of the second operating member into the displacement of the permanent magnet or the yoke and the first operating member. In addition, in the case where the permanent magnet is configured to be able to move between the first position and the second position, the yoke can be omitted and is not an essential element of the magnetic drilling machine.

[0275] [Method B2]

[0276] The magnetic drilling machine according to method B1, wherein:

[0277] The drive device has an electric motor configured to be driven according to an operation of the second operating member.

[0278] According to this configuration, the second operating member, the permanent magnet or the yoke, and the first operating member can be linked with each other with a simple device configuration.

[0279] [Mode B3]

[0280] The magnetic drilling machine according to method B2, wherein:

[0281] The second operating member is in the form of a button.

[0282] According to this structure, the user can very easily operate the second operating member with the fingers of one hand while supporting the magnetic drill press with both hands.

[0283] [Mode B4]

[0284] A magnetic drilling machine according to any one of Modes B1 to B3, wherein:

[0285] The second operating member is disposed at an end portion of the main housing on the opposite side from the drill unit in the direction in which the main housing and the drill unit are arranged.

[0286] According to this structure, when the user arranges the magnetic drill press at an appropriate position relative to the workpiece, the user can easily operate the second operating member with a finger near the end of the main housing that supports the drill unit on the side opposite to the drill unit. The "end" may be, for example, a quarter of the magnetic drill press on the side opposite to the drill unit in the direction in which the main housing and the drill unit are arranged, or may be a side of the magnetic drill press on the side opposite to the drill unit that intersects the direction in which the main housing and the drill unit are arranged.

[0287] [Mode B5]

[0288] A magnetic drilling machine according to any one of Modes B1 to B3, wherein:

[0289] The main housing and the drill unit are configured to be tiltable relative to the magnetic base about a tilt axis extending in a direction in which the main housing and the drill unit are arranged.

[0290] According to this structure, it is possible to form a hole extending in a direction that is angled with respect to the direction in which the workpiece and the magnetic drill are arranged.

[0291] [mode B6]

[0292] A magnetic drilling machine according to any one of Modes B1 to B3, further comprising:

[0293] The automatically winding anti-falling belt is installed on the main housing or the magnetic base and is configured to be able to fix the length surrounding the workpiece by a one-touch operation.

[0294] According to this structure, the anti-drop belt can be attached to the workpiece without loosening relative to the workpiece without removing the hand supporting the magnetic drill from the magnetic drill. Therefore, the convenience of the user is improved.

[0295] [mode B7]

[0296] The magnetic drilling machine according to method B6, wherein:

[0297] The anti-falling belt is fixedly mounted on the main shell or the magnetic base in an undetachable manner.

[0298] According to this structure, the user does not need to perform the operation of attaching the anti-falling belt to the main housing or the magnetic base, thereby improving the convenience of the user.

[0299] [mode B8]

[0300] The magnetic drilling machine according to method B7, wherein:

[0301] The anti-falling belt is fixedly mounted on the magnetic base in an undetachable manner.

[0302] According to this structure, compared with the structure in which the anti-drop belt is non-detachably mounted on the main housing, the extension distance of the anti-drop belt surrounding the workpiece is shortened. Therefore, it is more difficult to generate a gap between the anti-drop belt and the workpiece, and the looseness relative to the workpiece can be further reduced.

[0303] [mode B9]

[0304] A magnetic drilling machine according to any one of Modes B1 to B3, wherein:

[0305] The magnetic base has:

[0306] a protruding member capable of being mechanically displaced between a retracted position closest to the main housing and a protruding position farthest from the main housing by manual operation,

[0307] The magnetic base is configured to be able to change a contact area of ​​the magnetic base with respect to the workpiece between when the protruding member is located at the retracted position and when the protruding member is located at the protruding position, based on whether the protruding member can contact the workpiece.

[0308] According to this structure, the contact area of ​​the magnetic base with respect to the workpiece can be changed, and the force required for positioning the processing portion can be reduced in various ways. Therefore, the convenience of the user is improved.

[0309] [mode B10]

[0310] The magnetic drilling machine according to method B9, wherein:

[0311] The protruding member is configured to be displaceable in the following manner: when the magnetic adsorption force is in the maximum state, the contact area between the workpiece and the magnetic base is a first contact area, and when the magnetic adsorption force is in the minimum state, the contact area between the workpiece and the magnetic base becomes a second contact area smaller than the first contact area,

[0312] The protruding member is in the form of a sphere.

[0313] According to this structure, the user can easily align the processing part with a small force by rolling the ball when the magnetic adsorption force is at the minimum state. After the processing part is aligned, if the protruding member is displaced to maximize the magnetic adsorption force, the workpiece and the magnetic base can be firmly magnetically adsorbed.

[0314] [style B11]

[0315] The magnetic drilling machine according to embodiment B10 further comprises:

[0316] The linkage mechanism is configured to link the first operating member with the protruding member, so that when the first operating member is in a position corresponding to the maximum state, the contact area between the workpiece and the magnetic base is the first contact area, and when the first operating member is in a position corresponding to the minimum state, the contact area between the workpiece and the magnetic base is the second contact area.

[0317] According to this structure, since the first operating member and the protruding member are linked, it is not necessary to perform an operation for displacing the protruding member separately from the operation of the first operating member. Therefore, user convenience is improved.

[0318] [mode B12]

[0319] The magnetic drilling machine according to embodiment B9, further comprising:

[0320] The cam is configured to push the protruding member to the protruding position when the cam is at a predetermined rotation angle position.

[0321] According to this configuration, the projection member can be displaced between the retracted position and the projection position with a simple configuration.

[0322] [mode B13]

[0323] The magnetic drilling machine according to method B9, wherein:

[0324] The protruding member is in the form of a sphere.

[0325] [mode B14]

[0326] The magnetic drilling machine according to method B9, wherein:

[0327] The protruding member is configured to selectively switch a position of the protruding member between the protruding position and the retracted position when the magnetic adsorption force is in the maximum state.

[0328] According to this structure, if the processing part is aligned in a state where the protruding member is arranged at a position where the contact area between the workpiece and the magnetic base is relatively small, the processing part can be aligned in a state where the workpiece and the magnetic base are magnetically attracted with a relatively small magnetic attraction force. Therefore, the user can easily align the processing part with a small force. After the processing part is aligned, if the protruding member is arranged at a position where the contact area between the workpiece and the magnetic base is relatively large, the workpiece and the magnetic base can be firmly magnetically attracted.

[0329] [mode B15]

[0330] A magnetic drilling machine according to any one of Modes B1 to B3, further comprising:

[0331] The plate accessory is formed of a material that can be magnetically attracted to the magnetic base by the magnetic force of the permanent magnet and has a size that can be arranged at a position where the rotation axis of the drill intersects the plate accessory when the plate accessory is magnetically attracted to the magnetic base.

[0332] According to this configuration, even for a relatively small workpiece, the workpiece can be placed on a plate member magnetically attracted to a magnetic base, and a hole can be drilled in the workpiece.

[0333] [mode B16]

[0334] The magnetic drilling machine according to method B15, wherein:

[0335] The plate fitting has a through hole at a position where the rotating shaft of the drill can pass when the plate fitting is magnetically attracted to the magnetic base.

[0336] According to this structure, even when a through hole is formed in a workpiece using a magnetic drilling machine, as long as the drilling operation is performed in a state where the position of the through hole of the workpiece is aligned with the position of the through hole of the plate accessory, the plate accessory will not be damaged due to the operation of forming the through hole in the workpiece. Therefore, the service life of the plate accessory is extended and the convenience of the user is improved.

[0337] [mode B17]

[0338] The magnetic drilling machine according to method B16, wherein:

[0339] The plate fitting has a detent that at least partially matches the shape of the magnetic base.

[0340] According to this structure, the magnetic base can be easily positioned relative to the plate fitting.

[0341] [mode B18]

[0342] A magnetic drilling machine according to any one of Modes B1 to B3, wherein:

[0343] The invention further comprises a magnetic attachment configured to be fixedly mounted near the front end of the drill bit.

[0344] According to this structure, the chips are separated from the bit attached to the front end of the drill and magnetically attracted to the magnetic attachment, so that the chips can be easily separated from the bit and collected. Therefore, it is possible to suppress the deterioration of the visibility of the processed part caused by the chips.

[0345] [mode B19]

[0346] The magnetic drilling machine according to method B18, wherein:

[0347] A cover is provided so as to surround the periphery of the drill bit.

[0348] The magnetic fitting is mounted on the cover.

[0349] According to this configuration, the magnetic attachment can be arranged at an appropriate position away from the front end of the drill bit using the cover.

[0350] [mode B20]

[0351] The magnetic drilling machine according to method B19, wherein:

[0352] The magnetic accessory has a shape that can be detachably engaged with the cover.

[0353] According to this configuration, the chips can be easily removed by removing the magnetic attachment to which the chips are magnetically attracted from the cover.

[0354] [mode B21]

[0355] A magnetic drilling machine, wherein:

[0356] main housing;

[0357] a drill unit having a drill bit and supported by the main housing in a manner relatively movable with respect to the main housing in a direction in which a rotation axis of the drill bit extends; and

[0358] A magnetic base having a magnet and connected to the main housing, wherein the magnetic base is configured to be able to change the magnetic attraction force on the workpiece generated by the magnetic force of the magnet between a maximum state in which the magnetic attraction force is maximum and a minimum state in which the magnetic attraction force is minimum,

[0359] The magnetic base has:

[0360] a protruding member capable of being mechanically displaced between a retracted position closest to the main housing and a protruding position farthest from the main housing by manual operation,

[0361] The magnetic base is configured to be able to change a contact area of ​​the magnetic base with respect to the workpiece between when the protruding member is located at the retracted position and when the protruding member is located at the protruding position, based on whether the protruding member can contact the workpiece.

[0362] Since the magnetic base is a heavy object, the alignment of the part of the workpiece where the hole is to be drilled and the center of the drill bit (the center of the chisel installed at the front end of the drill bit, which is consistent with the rotation axis of the drill bit) (hereinafter also referred to as the alignment of the processing part) requires the sliding movement of the heavy object, which requires a lot of labor. On the other hand, according to the above-mentioned magnetic drilling machine, the contact area of ​​the magnetic base relative to the workpiece can be changed, and the force required for the alignment of the processing part can be reduced in various ways. Therefore, the convenience of the user is improved.

[0363] The magnetic base may be configured such that the magnetic attraction force is maximized when the protruding member is in the retracted position (in other words, the contact area between the workpiece and the magnetic base is maximized), or may be configured such that the magnetic attraction force is maximized when the protruding member is in the protruding position.

[0364] [mode B22]

[0365] A magnetic drilling machine, wherein:

[0366] main housing;

[0367] a drill unit having a drill bit and supported by the main housing so as to be relatively movable with respect to the main housing in a direction in which a rotation axis of the drill bit extends; and

[0368] A magnetic base having a magnet and connected to the main housing,

[0369] The main housing and the drill unit are configured to be tiltable relative to the magnetic base about a tilt axis extending in the direction in which the main housing and the drill unit are arranged.

[0370] According to the magnetic drill, the drill unit can be relatively moved relative to the main housing so that the rotation axis of the drill intersects the workpiece at an angle less than 90 degrees. Therefore, compared with the conventional magnetic drill that can only form a hole extending in the direction in which the workpiece and the magnetic drill are arranged, it is possible to form a hole extending in a direction that is angled relative to the direction in which the workpiece and the magnetic drill are arranged. Therefore, user convenience is improved.

[0371] [mode B23]

[0372] A magnetic drilling machine, wherein:

[0373] main housing;

[0374] a drill unit having a drill bit and supported by the main housing in a manner capable of relative movement with respect to the main housing in a direction in which a rotation axis of the drill bit extends;

[0375] a magnetic base having a magnet and connected to the main housing; and

[0376] The automatically winding anti-drop belt is mounted on the main housing or the magnetic base and is configured to be able to fix the length of the surrounding workpiece by a one-touch operation.

[0377] Usually, the anti-drop belt passes through the through hole of the magnetic drill press, and after being arranged in a ring shape so as to surround the workpiece, the portion extending from the ring is stretched and contracted, thereby adjusting the length in a manner that does not loosen relative to the workpiece, and then fixing it to the adjusted length. Such a length adjustment operation is easy when the magnetic drill press is used in a downward posture, but when the magnetic drill press is used in a horizontal posture or an upward posture, it is necessary to support the magnetic drill press with the hand while doing it, and it is not easy because one hand supporting the magnetic drill press needs to temporarily leave the magnetic drill press. On the other hand, according to the above-mentioned magnetic drill press, the anti-drop belt can be installed on the workpiece in a manner that does not loosen relative to the workpiece without leaving the hand supporting the magnetic drill press. Therefore, the convenience of the user is improved.

[0378] [mode B24]

[0379] A magnetic drilling machine, wherein:

[0380] main housing;

[0381] a drill unit having a drill bit and supported by the main housing in a manner capable of relative movement with respect to the main housing in a direction in which a rotation axis of the drill bit extends;

[0382] a magnetic base having a magnet and connected to the main housing; and

[0383] The plate fitting is made of a material that can be magnetically attracted to the magnetic base by the magnetic force of a magnet and has a size that allows it to be arranged at a position where the rotary axis of the drill intersects the plate fitting when the plate fitting is magnetically attracted to the magnetic base.

[0384] According to the magnetic drilling machine, even for a relatively small workpiece, the workpiece can be arranged on a plate accessory that is magnetically adsorbed to a magnetic base, and a hole drilling operation can be performed on the workpiece. For example, in the case where the workpiece is formed of a magnetic body, since the plate accessory is magnetic due to the magnetic force of the magnet of the magnetic base, the workpiece can be drilled while the workpiece is clamped on the plate accessory by the magnetic adsorption force of the plate accessory. Alternatively, in the case where the workpiece is formed of a non-magnetic body, the workpiece can be arranged on a plate accessory that is magnetically adsorbed to a magnetic base, and the hole drilling operation can be performed while the workpiece is held by hand. In this case, the plate accessory can also be used as a workbench.

[0385] [mode B25]

[0386] A magnetic drilling machine, wherein:

[0387] main housing;

[0388] a drill unit having a drill bit and supported by the main housing in a manner capable of relative movement with respect to the main housing in a direction in which a rotation axis of the drill bit extends;

[0389] a magnetic base having a magnet and connected to the main housing; and

[0390] The magnetic attachment is configured to be fixedly attachable near the front end of the drill bit.

[0391] The chips generated in the drilling operation usually have a long spiral shape and do not break in the middle, but rotate together with the chisel while being wound around the chisel installed on the front end of the drill bit. Such chips will deteriorate the visual recognition of the processing part (in other words, the chisel), thereby hindering the drilling operation. On the other hand, according to the above-mentioned magnetic drilling machine, the chips are separated from the chisel and magnetically attracted to the magnetic accessory. When the spiral chips rotating with the chisel are magnetically attracted to the fixedly installed magnetic accessory, a shear force acts on the chips, and the chips are cut off in the middle. Therefore, the magnetic accessory can easily separate and collect the chips from the chisel. Therefore, the deterioration of the visual recognition of the processing part caused by the chips can be suppressed. Therefore, the convenience of the user is improved.

[0392] <Fifth Embodiment>

[0393] Below, refer to Figures 16 to 19 , the magnetic drilling machine 1E of the exemplary fifth embodiment is described in more detail. Fig.16 As shown, the magnetic drilling machine 1E has a main housing 1020, a magnetic base 1030 and a drill unit 1040. In the following description, the direction in which the main housing 1020 and the drill unit 1040 are arranged is defined as the front-to-back direction of the magnetic drilling machine 1E. In the front-to-back direction, the side where the drill unit 1040 is located is defined as the front side of the magnetic drilling machine 1E, and the side where the main housing 1020 is located is defined as the rear side of the magnetic drilling machine 1E. In addition, the direction in which the main housing 1020 and the magnetic base 1030 are arranged is defined as the up-down direction of the magnetic drilling machine 1E. In the up-down direction, the side where the main housing 1020 is located is defined as the upper side of the magnetic drilling machine 1E, and the side where the magnetic base 1030 is located is defined as the lower side of the magnetic drilling machine 1E. In addition, the direction orthogonal to the front-to-back direction and the up-down direction is defined as the left-to-right direction. In the left-to-right direction, the right side when viewing the front side from the rear side is defined as the right side of the magnetic drilling machine 1E, and the opposite side is defined as the left side of the magnetic drilling machine 1E.

[0394] like Fig.16 and Fig.17 As shown, the drill unit 1040 has a drill 1041. A controller, a motor, and a speed change mechanism (none of which are shown in the figure) are housed in a housing of the drill unit 1040 located above the drill 1041. The controller controls the start and stop of the motor according to the operation of an operating member (not shown) for starting and stopping the magnetic drilling machine 1E. The drill 1041 rotates around a rotation axis AX1 extending in the vertical direction using a rotational driving force transmitted from the motor via the speed change mechanism. A chisel (working tool) 1045 for drilling a hole is installed at the front end (lower end) of the drill 1041.

[0395] The magnetic base 1030 has a substantially rectangular shape and contains permanent magnets 1032, 1033 (in Fig.16 and Fig.17 (not shown in the figure). The magnetic base 1030 has a contact surface 1031 formed of a magnetic material. The contact surface 1031 is the lower surface of the magnetic base 1030, and contacts with the magnetic workpiece to perform magnetic adsorption. In the present embodiment, the contact surface 1031 is a plane orthogonal to the up and down direction, but it can also be a curved surface, or it can also have concave and convex. The side and upper surfaces of the magnetic base 1030 are formed of non-magnetic materials. As described in detail later, the magnetic base 1030 is configured to enable the magnetic adsorption force on the workpiece generated by the magnetic force of the permanent magnets 1032 and 1033 to change between a maximum state in which the magnetic adsorption force is maximum and a minimum state in which the magnetic adsorption force is minimum. In the maximum state, the contact surface 1031 is firmly magnetically adsorbed to the workpiece, and the positional relationship between the magnetic base 1030 (further, the magnetic drilling machine 1E) and the workpiece is firmly fixed. In the minimum state, the magnetic adsorption force is typically zero, and the contact surface 1031 is not magnetically adsorbed to the workpiece. However, in the minimum state, a magnetic attraction force of a degree capable of changing the relative position between the contact surface 1031 and the workpiece may act.

[0396] The main housing 1020 is located on the magnetic base 1030 and connected to the magnetic base 1030. An annular handle 1080 protruding upward is arranged on the upper end surface of the main housing 1020. The user can hold the annular handle 1080 to carry the magnetic drill press 1E. The annular handle 1080 is arranged at a position corresponding to the center of gravity of the magnetic drill press 1E or its vicinity on a plane extending in a direction perpendicular to the up-down direction. The main housing 1020 has a battery mounting portion for detachably mounting a battery 1025 for supplying power to the magnetic drill press 1E. An AC commercial power supply may also be used instead of the battery 1025.

[0397] The drill unit 1040 is supported by the main housing 1020 in a manner that allows relative movement in the up-down direction (i.e., the extension direction of the rotation axis AX1) relative to the main housing 1020. Specifically, the drill unit 1040 is provided with a guide rail 1021 extending in the up-down direction at its rear edge. In addition, the main housing 1020 is provided with a guide rail 1042 extending in the up-down direction at its front edge. The guide rail 1021 is arranged on the inner side of the guide rail 1042 and engages with the guide rail 1042 in a manner that allows sliding in the up-down direction. As a result, the drill unit 1040 is configured to move relative to the main housing 1020 in the up-down direction.

[0398] The magnetic drilling machine 1E also has a rotation operating member 1070. The rotation operating member 1070 is mounted on the front side of the main housing 1020. The rotation operating member 1070 is supported by the main housing 1020 so as to be rotatable around a rotation axis extending in the left-right direction by manual operation. A shaft coaxial with the rotation axis of the rotation operating member 1070 is arranged inside the main housing 1020. A pinion gear formed on the circumference of the shaft meshes with a rack formed on the guide rail 1021 in the up-down direction via an opening of the guide rail 1042. According to such a structure, when the user performs a rotation operation on the rotation operating member 1070, the drill unit 1040 is raised and lowered relative to the main housing 1020 by a distance in the up-down direction corresponding to the rotation amount. The rotation operating member 1070 can also be configured to be detachable from the main housing 1020. In this case, the rotation operating member 1070 can also be selectively mounted on a plurality of locations (typically the left side and right side of the main housing 1020).

[0399] A first operating member 1050 for manual operation is mounted on the rear end surface of the main housing 1020, and the manual operation is used to change the magnetic attraction force of the magnetic base 1030 between the maximum state and the minimum state. The first operating member 1050 is configured to protrude from the rear end surface of the main housing 1020. In the present embodiment, the first operating member 1050 is in the form of a knob that can rotate around a rotation axis extending in the front-rear direction.

[0400] like Fig.18 As shown, on the first operating member 1050, a rod 1051 is installed coaxially with its rotation axis. The rod 1051 passes through the rear end wall of the main housing 1020 from the first operating member 1050 and extends to the inside of the main housing 1020. Inside the main housing 1020, a gear 1052 is installed on the rod 1051. The gear 1052 is meshed with a gear 1053 arranged below the gear 1052. The gear 1053 is connected to one end of the rod 1054. The gear 1053 and the rod 1054 are accommodated in the magnetic base 1030. The other end of the rod 1054 is connected to the permanent magnet 1032. Through such a structure, the permanent magnet 1032 is configured to rotate in conjunction with the rotation operation of the first operating member 1050. In an alternative embodiment, the first operating member 1050 can also be directly connected to the permanent magnet 1032 in an operable manner (not via the gears 1052, 1053, etc.).

[0401] like Fig.19 As shown, the permanent magnets 1032 and 1033 are separated in the vertical direction and arranged opposite to each other in the magnetic base 1030. As described above, the permanent magnet 1032 can rotate in conjunction with the rotation of the first operating member 1050, while the permanent magnet 1033 is fixedly arranged in a manner that cannot be displaced. Fig.19As shown on the left side of , when the permanent magnet 1032 is in the first position, the magnetic lines of force pass through the workpiece in contact with the contact surface 1031, and as a result, a maximum state in which the magnetic attraction force is the largest is achieved, wherein the first position is a position in which the N pole of the permanent magnet 1032 and the N pole of the permanent magnet 1033 are located on the same side, and the S pole of the permanent magnet 1032 and the S pole of the permanent magnet 1033 are located on the same side. On the other hand, as Fig.19 As shown on the right side of , when the permanent magnet 1032 is in the second position, the magnetic lines of force hardly pass through the workpiece, resulting in a minimum state in which the magnetic adsorption force is minimized, wherein the second position is a position in which the N pole of the permanent magnet 1032 and the N pole of the permanent magnet 1033 are diagonally offset, and the S pole of the permanent magnet 1032 and the S pole of the permanent magnet 1033 are diagonally offset.

[0402] For example, such a structure for changing the magnetic attraction force is also described in US Pat. No. 9,452,521, which is incorporated herein by reference in its entirety.

[0403] The change of the magnetic attraction force on the workpiece generated by the magnetic force of the permanent magnet is not limited to the above-mentioned method, and can be achieved in any manner. For example, in an alternative embodiment, as is known in the magnetic chuck technology, the path of the magnetic lines of force can be changed between a path that passes through the workpiece without passing through the yoke and a path that passes through the yoke and hardly passes through the workpiece by sliding a yoke disposed between the magnet and the workpiece in the up-down direction parallel to the magnet.

[0404] When using the magnetic drill 1E, the user first positions the magnetic drill 1E relative to the workpiece in a state where the workpiece is in contact with the contact surface 1031. Then, the user rotates the first operating member 1050 to change the magnetic adsorption force of the magnetic base 1030 from the minimum state to the maximum state. As a result, the magnetic base 1030 is firmly magnetically adsorbed to the workpiece. Then, the user operates the operating member of the drill unit 1040 to start the motor and rotate the drill 1041. Then, the user rotates the rotating operating member 1070 to lower the chisel 1045 rotating with the drill 1041 toward the workpiece, thereby performing a hole drilling operation.

[0405] In such a method of use, when the magnetic drill press 1E is used in a horizontal posture (a posture in which the main housing 1020 and the magnetic base 1030 are arranged in the horizontal direction) or an upward posture (a posture in which the magnetic base 1030 is located above the main housing 1020 in the vertical direction), it is not easy to operate the magnetic adsorption force to the maximum state because it is necessary to support the magnetic drill press 1E with both hands while rotating the first operating member 1050. Therefore, in the present embodiment, the magnetic drill press 1E has a structure that can easily operate the magnetic adsorption force to the maximum state even when the magnetic drill press 1E is used in a horizontal posture or an upward posture. Such a structure is described below. In addition, in this specification, "vertical direction" and "horizontal direction" refer to directions that are independent of the posture of the magnetic drill press 1E. Specifically, the "vertical direction" refers to the direction in which gravity acts and the opposite direction thereof, and the "horizontal direction" refers to the direction orthogonal to the vertical direction.

[0406] like Fig.16 and Fig.17 As shown, the magnetic drilling machine 1E also has a second operating member 1055 and a drive device 1060. The second operating member 1055 is configured to be able to perform a manual operation for displacing the permanent magnet 1032 toward the first position (towards the position for the maximum state) in a single-touch manner. In the present embodiment, the second operating member 1055 is in the form of a button. However, as long as the second operating member 1055 can be operated in a single-touch manner, it can be changed to any form, for example, it can also be in the form of a sliding switch. According to such a structure, the user can easily operate the second operating member 1055 with the fingers of one hand while supporting the magnetic drilling machine 1E with both hands.

[0407] The second operating member 1055 can be provided at any position, but in the present embodiment, the second operating member 1055 is provided at the same side as the position where the rotation operating member 1070 is provided. In addition, in the present embodiment, the second operating member 1055 is provided at the end portion (i.e., the rear end portion) of the main housing 1020 on the side opposite to the drill unit 1040 in the front-to-back direction (in other words, the direction in which the main housing 1020 and the drill unit 1040 are arranged). More specifically, in the present embodiment, the second operating member 1055 is provided near the edge portion in the front-to-back direction of the left side surface of the main housing 1020. The user usually holds the annular handle 1080 with one hand and holds the rear end portion of the magnetic drill 1E with the other hand to support the magnetic drill 1E when the magnetic drill 1E is properly positioned relative to the workpiece. Therefore, by providing the second operating member 1055 near the rear end portion of the magnetic drill 1E, the operation of the second operating member 1055 becomes easier. In the case where the installation position of the rotational operation member 1070 can be changed, a plurality of second operation members 1055 may be arranged corresponding to the plurality of installation positions of the rotational operation member 1070. Alternatively, considering that the magnetic drill 1E can be used in various postures, a plurality of second operation members 1055 may be arranged corresponding to the plurality of assumed usage postures of the magnetic drill 1E.

[0408] The driving device 1060 is provided to realize the function of the second operating member 1055. Specifically, the driving device 1060 is configured to displace the permanent magnet 1032 toward the first position (the position for the maximum state) according to the operation of the second operating member 1055, and displace the first operating member 1050 toward the position corresponding to the maximum state. More specifically, as Fig.17 and Fig.18 As shown, the driving device 1060 has an electric motor 1061 and a gear 1062. The electric motor 1061 is accommodated in the main housing 1020. The gear 1062 is arranged outside the main housing 1020, but can also be accommodated in the main housing 1020. The gear 1062 meshes with a pinion formed on the rod 1051 for transmitting the displacement of the first operating member 1050 to the permanent magnet 1032.

[0409] When the user presses the second operating member 1055, the electric motor 1061 is driven, the gear 1062 rotates by the rotational driving force of the electric motor 1061, and the rod 1051 and the permanent magnet 1032 also rotate. The rotation direction of the electric motor 1061 is limited to the direction in which the permanent magnet 1032 is displaced toward the first position. In addition, by the rotation of the rod 1051, the first operating member 1050 also rotates toward the position corresponding to the maximum state.

[0410] According to the above structure, even when the magnetic drill press 1E is used in a horizontal posture or an upward posture, the user can displace the permanent magnet 1032 in the direction in which the magnetic base 1030 is magnetically attracted to the workpiece by a single-touch operation of the second operating member 1055 using the hand supporting the magnetic drill press 1E without rotating the first operating member 1050, thereby magnetically attracting the magnetic base 1030 to the workpiece. Therefore, user convenience is improved.

[0411] Furthermore, since the driving device 1060 uses the electric motor 1061, the second operating member 1055, the permanent magnet 1032, and the first operating member 1050 can be linked with each other with a simple device structure. However, such a linked operation can be realized using any actuator or mechanical mechanism.

[0412] <Sixth Embodiment>

[0413] Below, refer to Fig. 20 and Fig.21 A magnetic drill press 1F according to an exemplary sixth embodiment will be described. In the following description, only the differences from the fifth embodiment will be described with respect to the magnetic drill press 1F. In addition, the magnetic drill press 1F does not have the second operating member 1055 and the drive device 1060 of the fifth embodiment. In addition, the first operating member 1050 is mounted on the magnetic base 1030, and the magnetizing force of the magnetic base 1030 is changed by rotating the permanent magnet 1032 directly connected to the rod 1051.

[0414] In the sixth embodiment, the main housing 1020 and the drill unit 1040 are configured to be able to tilt relative to the magnetic base 1030 around a tilt axis AX2 extending in the front-rear direction. Fig.21 As shown, the magnetic base 1030 has support parts 1131 and 1132 at the top of the front side thereof. The support parts 1131 and 1132 are arranged separately in the front-to-back direction. The connecting part 1121 formed at the front edge of the main housing 1020 is located between the support parts 1131 and the support parts 1132. A coaxial through hole penetrating in the front-to-back direction is formed in each of the support parts 1131 and 1132 and the connecting part 1121 of the main housing 1020.

[0415] The bolt 1190 passes through these through holes, and a nut (not shown) is installed at the top end (rear end) of the bolt 1190. The head of the bolt 1190 is held in the operating rod 1191 in a non-rotating state. When the operating rod 1191 is rotated to tighten the bolt 1190, the connecting portion 1121 is tightened in the front-to-back direction by the supporting portions 1131 and 1132, and the relative position of the connecting portion 1121 and the supporting portions 1131 and 1132 (further, the relative position of the main housing 1020 and the magnetic base 1030) is fixed.

[0416] On the other hand, when the operating lever 1191 is rotated in the opposite direction to loosen the bolt 1190, the fixed relationship between the relative positions of the main housing 1020 and the magnetic base 1030 is released. In this state, the main housing 1020 and the drill unit 1040 can be tilted relative to the magnetic base 1030 with the tilt axis AX2 (bolt 1190) as the center. If the bolt 1190 is tightened again at the desired tilt position, the relative position of the main housing 1020 and the magnetic base 1030 is fixed at the tilt position. In such a tilting action, in order to prevent the main housing 1020 from interfering with the magnetic base 1030, cutouts 1122 are formed on the right side and left side of the main housing 1020 (at Fig.21 In the figure, only the cutout portion 1122 on the left side can be seen).

[0417] According to the magnetic drilling machine 1F, the drill bit 1041 can be selectively placed in an upright position with the rotation axis AX1 extending in the vertical direction (see Fig. 20 ) and the tilting posture of the rotation axis AX1 relative to the vertical direction (refer to Fig.21 According to the latter, it is possible to form a hole extending in a direction that is angled relative to the direction in which the workpiece and the magnetic drilling machine 1F are arranged.

[0418] <Seventh Embodiment>

[0419] Below, refer to Fig. 22 and Fig.23 A magnetic drill 1G according to an exemplary seventh embodiment will be described. In the following description, only the points different from the fifth embodiment will be described regarding the magnetic drill 1G. The magnetic drill 1G does not include the second operating member 1055 and the driving device 1060 of the fifth embodiment.

[0420] like Fig. 22 and Fig.23 As shown, the magnetic drill 1G has an anti-drop belt 1290. When the magnetic drill 1G is used, the anti-drop belt 1290 is configured in a ring shape so as to surround a workpiece (e.g., a steel bar) extending in the air, and is fastened around the workpiece. In this way, the magnetic drill 1G can be fixed so as not to fall. The anti-drop belt 1290 is an automatic winding type, and has a long belt body 1291, a winding portion 1293, and a fixing portion 1294.

[0421] In the present embodiment, the anti-drop belt 1290 is fixedly mounted on the magnetic base 1030 in an undetachable manner. By setting the anti-drop belt 1290 as an undetachable structure, the user does not need to perform the operation of mounting the anti-drop belt 1290 on the magnetic base 1030. However, the anti-drop belt 1290 may also be mounted on the magnetic base 1030 in a detachable manner. In addition, by mounting the anti-drop belt 1290 on the magnetic base 1030, the extension distance of the anti-drop belt 1290 surrounding the workpiece is shortened compared to the structure in which the anti-drop belt 1290 is mounted on the main shell 1020. Therefore, it is less likely to generate a gap between the anti-drop belt 1290 and the workpiece, and the looseness of the anti-drop belt 1290 relative to the workpiece can be further reduced. However, the anti-drop belt 1290 may also be mounted on the main shell 1020.

[0422] The winding portion 1293 has an automatic winding device built in. As the automatic winding device, for example, a device used in a car seat belt and a cord winding device for a vacuum cleaner are widely known. The winding portion 1293 may also have an operating member for winding like a cord winding device for a vacuum cleaner. The winding portion 1293 is fixed to the left side of the magnetic base 1030. The fixing portion 1294 is configured to fix the front end 1292 of the belt body 1291. The fixing portion 1294 can use any known structure that can fix the front end 1292 by a one-touch operation.

[0423] According to the magnetic drilling machine 1G, the length of the anti-dropping belt 1290 surrounding the workpiece is automatically reduced (including the case of reduction without operation and the case of reduction by one-touch operation) in a manner that does not loosen relative to the workpiece, so there is no need to perform the operation of tightening the belt body 1291 around the workpiece. In addition, the anti-dropping belt 1290 can be installed on the workpiece by one-touch operation using the hand supporting the magnetic drilling machine 1G.

[0424] <Eighth Implementation Method>

[0425] Below, refer to Figures 24 to 28 A magnetic drill 1H according to an exemplary eighth embodiment will be described. In the following description, only the points that are different from the fifth embodiment will be described regarding the magnetic drill 1H. The magnetic drill 1H does not have the second operating member 1055 and the driving device 1060 of the fifth embodiment.

[0426] like Fig.24As shown, the magnetic base 1030 of the magnetic drilling machine 1H has four protruding members 1331. Each protruding member 1331 is stored in a bottomed hole 1333 formed at the bottom of the magnetic base 1030 in a state of preventing it from falling off (anti-falling state). When viewed from below, the four protruding members 1331 are arranged near the four corners of the roughly rectangular magnetic base 1030 (contact surface 1031). The protruding member 1331 can be manually operated without being affected by magnetism in the retreat position closest to the main housing 1020 (refer to Fig.26 ) and the protruding position farthest from the main housing 1020 (refer to Fig. 27 ) are mechanically displaced between. In the present embodiment, the protruding member 1331 is formed of a magnetic material, but may also be formed of a non-magnetic material.

[0427] In this embodiment, the displacement of the protruding member 1331 is linked to the displacement of the first operating member 1050. Fig.25 As shown (in Fig.25 In order to improve visual recognition, the main housing 1020, the magnetic base 1030 and the permanent magnets 1032, 1033 are removed, and the permanent magnet 1032 is rotatably supported (in Fig.25 The rod 1054 (not shown) is connected to the cam 1332 at both ends. When the rod 1054 rotates with the rotation operation of the first operating member 1050, the cam 1332 also rotates. When the first operating member 1050 is located at a position corresponding to the maximum state where the magnetic adsorption force becomes the maximum, as shown in FIG. Fig.26 As shown in FIG. 1 , the cam 1332 is located at a rotation angle position where it does not contact the protruding member 1331. As a result, the protruding member 1331 is located at a position where it does not go over the contact surface (bottom surface) 31 of the magnetic base 1030 downward (i.e., it is located at the retreat position). On the other hand, when the first operating member is located at a position corresponding to the minimum state where the magnetic adsorption force becomes the minimum, as shown in FIG. Fig. 27 As shown, the cam is located at a position to press the protruding member 1331 downward. As a result, the protruding member 1331 protrudes slightly downward from the contact surface 1031 of the magnetic base 1030 (ie, is located at a protruding position).

[0428] When the protruding member 1331 is in the retreat position (when the magnetic adsorption force is at the maximum state), the contact surface 1031 can contact the workpiece. Therefore, the magnetic base 1030 (further, the magnetic drilling machine 1H) can be firmly fixed to the workpiece. On the other hand, when the protruding member 1331 is in the protruding position (when the magnetic adsorption force is at the minimum state), even if the magnetic base 2 is arranged on the workpiece, the contact surface 1031 does not contact the workpiece. Fig.28 As shown, only the bottom of the protruding member 1331 contacts the workpiece.

[0429] That is, when the magnetic adsorption force is in the minimum state, the magnetic adsorption force on the workpiece is greatly weakened (or becomes zero) compared to when it is in the maximum state because there is a gap between the contact surface 1031 and the workpiece. In addition, the contact area between the protruding member 1331 formed of a magnetic material and the workpiece is very small, and the protruding member 1331 is a sphere that is easy to roll. Therefore, even in the case where the magnetic adsorption force on the workpiece is generated, the user can reduce the force required for sliding movement between the part of the workpiece where the hole should be opened and the center of the drill bit 1041 (the center of the chisel 1045 installed on the drill bit 1041, which is consistent with the rotation axis AX1) (hereinafter also referred to as the alignment of the processing part). Therefore, the user can easily align the processing part. In the case where the magnetic adsorption force on the workpiece is zero in the minimum state or when the protruding member 1331 is formed of a non-magnetic material, since the magnetic adsorption force does not act between the protruding member 1331 and the workpiece, the alignment of the processing part becomes easier.

[0430] Moreover, in the present embodiment, the first operating member 1050 and the protruding member 1331 are linked via the rod 1051, the gears 1052, 1053, the rod 1054, and the cam 1332, so that when the first operating member 1050 is located at a position corresponding to the maximum state, the contact area between the workpiece and the magnetic base 1030 becomes relatively large, and when the first operating member 1050 is located at a position corresponding to the minimum state, the contact area between the workpiece and the magnetic base 1030 becomes relatively small. Therefore, it is not necessary to perform the operation for displacing the protruding member 1331 separately from the operation of the first operating member 1050. However, the magnetic drilling machine 1H may also be configured so that the displacement of the first operating member 1050 is not linked to the displacement of the protruding member 1331. In this case, the magnetic drilling machine 1H may also have an operating member for displacing the protruding member 1331 independently of the first operating member 1050.

[0431] In an alternative embodiment, the number of protruding members 1331 is not particularly limited and can be any number of more than one. In another alternative embodiment, the protruding member 1331 can have any shape (e.g., cylindrical) instead of a spherical shape. Even in this case, if the protruding member 1331 is formed of a non-magnetic material, the magnetic adsorption force will not act between the protruding member 1331 and the workpiece, so the user can easily perform the alignment of the processing part.

[0432] In another alternative embodiment, the magnetic drilling machine 1H may also be configured such that when the magnetic adsorption force is at a maximum state, the position of the protruding member 1331 can be selectively switched between the protruding position and the retracted position. In this case, the magnetic drilling machine 1H may also have an operating member for displacing the protruding member 1331 independently of the first operating member 1050. Even with this structure, the user can easily align the processing part when the protruding member 1331 is in the protruding position (in other words, when the contact area between the workpiece and the magnetic base 1030 is relatively small).

[0433] In another alternative embodiment, the magnetic base 1030 may also be configured such that when the protruding member 1331 is in the protruding position, the magnetizing force on the workpiece becomes relatively large, and when the protruding member 1331 is in the retreating position, the magnetic adsorption force on the workpiece becomes relatively small. For example, a concave portion and a convex portion may be formed on the bottom surface of the magnetic base 1030, and the protruding member 1331 may be accommodated in the concave portion. In this case, when the protruding member 1331 is in the protruding position, the protruding member 1331 protrudes to the same level as the convex portion and can contact the workpiece, thereby achieving a relatively large contact area, and when the protruding member 1331 is in the retreating position, the protruding member 1331 retreats to a position closer to the main housing 1020 than the convex portion and cannot contact the workpiece, thereby achieving a relatively small contact area.

[0434] <Ninth Embodiment>

[0435] Below, refer to Fig.29 A magnetic drill 1K according to an exemplary ninth embodiment will be described. In the following description, only the points different from the fifth embodiment will be described regarding the magnetic drill 1K. The magnetic drill 1K does not have the second operating member 1055 and the driving device 1060 of the fifth embodiment.

[0436] like Fig.29 As shown, the magnetic drilling machine 1K has a plate accessory 1490. The magnetic drilling machine 1K can be used when drilling relatively small workpieces. The plate accessory 1490 is in the form of a substantially flat plate and is formed of a magnetic material. Fig.29 As shown, the magnetic drill 1K is used in a state where the plate fitting 1490 is magnetically attracted to the magnetic base 1030. Since the plate fitting 1490 is formed of a magnetic material, the magnetic drill 1K can be firmly fixed to the plate fitting 1490.

[0437] The plate accessory 1490 has a size that allows it to be arranged at a position where the rotation axis AX1 of the drill bit 1041 intersects with the plate accessory 1490 when the plate accessory 1490 is magnetically adsorbed to the magnetic base 1030. Therefore, if a workpiece is arranged directly below the drill bit 1041, a hole drilling operation can be performed on the workpiece on the magnetic drilling machine 1K. In the case where the workpiece is formed of a magnetic material, since the plate accessory 1490 is magnetic due to the magnetic force of the magnet of the magnetic base 1030, the workpiece can be drilled while the workpiece is clamped on the plate accessory 1490 by the magnetic adsorption force of the plate accessory 1490. In the case where the workpiece is formed of a non-magnetic material, the user can arrange the workpiece on the plate accessory 1490 that is magnetically adsorbed to the magnetic base 1030, and perform the hole drilling operation while holding the workpiece by hand. In this case, the plate accessory 1490 can also be used as a workbench.

[0438] like Fig.29 As shown, the plate accessory 1490 has a positioning groove 1493 that at least partially matches the shape of the magnetic base 1030. In this embodiment, the positioning groove 1493 has a shape that matches the entirety of the magnetic base 1030. However, the positioning groove 1493 may also have only a front portion that matches the front portion of the magnetic base 1030, and a rear portion that has a larger area than the magnetic base 1030 so as to accommodate the rear portion of the magnetic base 1030.

[0439] The plate accessory 1490 also has a mark 1491. In the present embodiment, the mark 1491 has a cross shape, but may have any shape. The mark 1491 is arranged at a position where the center of the cross coincides with the rotation axis AX1 of the drill bit 1041 when the magnetic base 1030 is arranged in the positioning groove 1493 for positioning. According to this structure, the magnetic base 1030 can be easily positioned relative to the plate accessory 1490.

[0440] In an alternative embodiment, the plate accessory 1490 may also have a through hole at a position where the rotation axis AX1 of the drill bit (in other words, the chisel 1045) can pass when the plate accessory 1490 is magnetically adsorbed to the magnetic base 1030. According to this structure, even when a through hole is formed in a workpiece using a magnetic drilling machine 1K, as long as the hole drilling operation is performed in a state where the position of the through hole of the workpiece is aligned with the position of the through hole of the plate accessory, the plate accessory 1490 will not be damaged by the operation of forming the through hole in the workpiece. Therefore, the service life of the plate accessory 1490 is extended. In this case, the plate accessory 1490 may also be configured so that when the magnetic base 1030 is arranged in the positioning groove 1493 for positioning, the position of the through hole of the plate accessory 1490 matches the rotation axis AX1.

[0441] The plate fitting 1490 further has a plurality of (four in the illustrated example) through holes 1492. The plurality of through holes 1492 are arranged at the four corners of the substantially rectangular plate fitting 1490. The plurality of through holes 1492 can be used to fix the plate fitting 1490 to the workbench using any fixing tool.

[0442] <Tenth Implementation Method>

[0443] Below, refer to Fig.30 and Fig.31 A magnetic drill 1L according to an exemplary tenth embodiment will be described. In the following description, only the points different from the fifth embodiment will be described regarding the magnetic drill 1L. The magnetic drill 1L does not have the second operating member 1055 and the driving device 1060 of the fifth embodiment.

[0444] like Fig.30 and Fig.31 As shown, the magnetic drilling machine 1L has a cover 1590 and a magnetic accessory 1591. The cover 1590 is mounted on the magnetic base 1030 in a U-shaped manner to surround the periphery of the drill bit 1041. In order to improve the visual recognition of the processing part (the front end of the chisel 1045), a plurality of through holes are formed in the cover 1590. According to the cover 1590, it is possible to suppress the chips generated by the drilling operation from flying around.

[0445] The magnetic accessory 1591 has a permanent magnet 1592 and a snap-fit ​​portion 1593. In the present embodiment, the permanent magnet 1592 is in the form of a magnet plate. The snap-fit ​​portion 1593 has a plate bent into an asymmetric U-shape and has two opposing flat plate portions. The area of ​​one flat plate portion is larger than the area of ​​the other flat plate portion. The permanent magnet 1592 is bonded to the larger flat plate portion of the snap-fit ​​portion 1593 (more specifically, the surface on the opposite side of the smaller flat plate portion).

[0446] The magnetic accessory 1591 is fixedly mounted near the front end of the drill bit 1041 in a detachable manner (i.e., non-displaceable). Specifically, it is placed on the upper edge of the front wall of the cover 1590 in such a manner that the front wall of the cover 1590 is located between the two flat plate parts of the engaging part 1593. Thus, the magnetic accessory 1591 is detachably engaged with the cover 1590. At this time, the permanent magnet 1592 is located at a position opposite to the drill bit 1041.

[0447] According to the magnetic drilling machine 1L, when performing a hole drilling operation, the longer spiral chips leave the chisel 1045 and are magnetically attracted to the magnetic accessory 1591. When the spiral chips rotating with the chisel 1045 are magnetically attracted to the fixedly mounted magnetic accessory 1591, a shear force acts on the chips and the chips are cut off in the middle. Therefore, the magnetic accessory 1591 can easily separate and collect the chips from the chisel 1045. Therefore, the deterioration of the visual recognizability of the processed part caused by the chips can be suppressed. In addition, by removing the magnetic accessory 1591 to which the chips are magnetically attracted from the cover 1590, the chips can be easily removed from the magnetic accessory 1591. In addition, by using the cover 1590, the magnetic accessory 1591 can be arranged at an appropriate position away from the front end of the drill bit 1041.

[0448] In an alternative embodiment, a magnetic accessory of any shape can be installed in any form at any position near the front end of the drill bit 1041. For example, a magnet holder can be provided that extends forward from the front edge of the magnetic base 1030 away from the drill bit 1041. In this case, a permanent magnet can also be installed on the magnet holder.

[0449] Several embodiments of the present invention have been described above, but the above embodiments are intended to facilitate the understanding of the present invention and are not intended to limit the present invention. The present invention can be changed and improved without departing from its main purpose, and its equivalents are included in the present invention. In addition, within the scope of at least a part of the above-mentioned problems that can be solved or within the scope of at least a part of the effects that can be achieved, any combination or omission of the various mode elements described in the claims and the specification can be performed.

[0450] For example, in the sixth to tenth embodiments, electromagnets may be used instead of the permanent magnets 1032 and 1033. In addition, any mechanical mechanism may be used instead of the above-mentioned structure as long as it can realize at least a part of the function of the above-mentioned magnetic drilling machine.

Claims

1. A magnetic drilling machine, characterized in that: have: A magnetic base configured to be selectively fixed to a workpiece using magnetic force; A main body connected to the magnetic base; a drill unit including a spindle configured to detachably hold a front end tool, the drill unit being supported on the main body so as to be movable in a direction parallel to a rotation axis of the spindle; a battery mounting portion configured to detachably hold a battery for supplying power to the magnetic drilling machine; as well as a cover configured to at least partially cover the battery mounting portion, The battery installation portion has: A rail extending linearly in a first direction and configured to slide and engage with the groove of the battery in response to movement of the battery relative to the rail from a first side to a second side in the first direction; as well as a terminal portion having a terminal configured to be electrically connected to a terminal of the battery when the battery is arranged at a predetermined position of the battery mounting portion; The cover is displaceable relative to the main body portion, and is configured to overlap the entire terminal portion when viewed from the first side in the first direction when the cover is located at a first position.

2. The magnetic drilling machine according to claim 1, characterized in that: The cover is configured to substantially cover the entire portion of the battery mounted on the battery mounting portion that is exposed from the battery mounting portion when the cover is located at the first position.

3. The magnetic drilling machine according to claim 1 or 2, characterized in that: The battery mounting portion has a recessed portion configured to receive at least a portion of the battery. The recess has an opening on the first side in the first direction, The cover is configured to substantially block the opening of the recessed portion when the cover is located at the first position.

4. The magnetic drilling machine according to claim 3, characterized in that: The recess is configured to accommodate at least half of the battery.

5. The magnetic drilling machine according to any one of claims 1 to 4, characterized in that: Also features: The locking member is configured to lock the cover at the first position relative to the main body.

6. The magnetic drilling machine according to any one of claims 1 to 5, characterized in that: The cover is connected to the main body in a manner that allows rotation between the first position and the second position. The cover is configured to allow installation and removal of the battery when the cover is in the second position.

7. The magnetic drilling machine according to any one of claims 1 to 6, characterized in that: The first direction is a direction parallel to the rotation axis of the spindle.

8. A magnetic drilling machine, wherein: have: A magnetic base configured to be selectively fixed to a workpiece using magnetic force; A battery receiving portion connected to the upper side of the magnetic base and having an opening at the upper portion; A guide portion connected to the battery receiving portion; a guided portion guided in the up-down direction by the guiding portion; a motor connected to the guided portion and rotated by power supplied from the battery receiving portion; a drill unit including a spindle rotated by the motor; and The cover is configured to cover the opening.

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