JP5413135B2 - Tabletop cutting machine - Google Patents

Description

  The present invention relates to a tabletop cutting machine such as a tabletop circular saw, and more particularly to a tabletop cutting machine including a flat motor.

  As shown in Patent Document 1, a tabletop cutting machine is known which has a turntable rotatably attached to a base portion and a cutting portion having a circular saw blade attached to a turntable so as to be tiltable. (Patent Document 1). In such a tabletop cutting machine, the member to be cut can be cut at an angle by rotating the turntable relative to the base portion, and the member to be cut can be cut at an angle by tilting the cutting portion with respect to the turntable. It becomes possible. The circular saw blade is composed of a rotor in which a coil is wound around an iron core extending in a columnar shape in the axial direction of the output shaft, and a cylindrical stator that covers the rotor, and the output shaft is connected to the rotary shaft of the circular saw blade. It is driven by a motor arranged substantially in parallel.

JP 2006-327088 A

  By the way, in the tabletop cutting machine using the motor as described above, the rotor and the stator are long in the axial direction of the motor output shaft, and the axial dimension of the motor output shaft is also long. In order to perform the inclined cutting in any direction of the axis of the rotary shaft of the circular saw blade, the power transmission mechanism composed of a belt and a pulley is installed in the motor of the cutting unit so that the motor does not contact the turntable or the like during the inclination. It is provided between the circular saw blade and the mounting position of the motor away from the circular saw blade and the turntable. However, since the cutting unit includes the motor and the power transmission mechanism described above, there is a problem that the axial dimension of the motor output shaft of the cutting unit is large, and the worker's field of view is hindered by the cutting unit.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a tabletop cutting machine capable of suppressing the axial dimension of an output shaft of a motor and ensuring a worker's field of view.

To achieve the above object, a bench cutter according to a first aspect of the present invention is provided with a workpiece and can be placed base to the upper, rotatable with said base portion to the first shaft around a table portion that is, a swing unit for swinging above and below the second mounted rotatably on said table section around the axis the table section which is substantially orthogonal to the first axis, the rotating rotor fixed The rotor has an output shaft, and one of the rotor and the stator has a substantially annular shape arranged in a circumferential direction around the output shaft when viewed in the axial direction of the output shaft. A disk-shaped coil disk provided with a plurality of coils, and one of the rotor and the stator has a magnetic flux generating means for generating a magnetic flux passing through the coil disk in the axial direction of the output shaft; A flat motor, and the axial direction and front of the output shaft of the flat motor A second respective axially substantially attachable to the rotary blade rotating shaft axial direction is arranged parallel to the rotary blade of the shaft, a power transmission unit for transmitting the power of該扁flat motor to the rotary blade, the And a cutting portion provided on the swinging portion.

  Further, between the table portion and the swing portion, the first portion and the second shaft are attached to the table portion so as to be rotatable around a third axis substantially orthogonal to the first axis and the second axis, and It is preferable that a tilting portion for supporting the swinging portion is provided so as to be rotatable around the axis of 2.

  In addition, a slide support portion is provided between the tilt portion and the swing portion so as to support the swing portion on the tilt portion so as to be movable substantially parallel to the axial direction of the third shaft. Also good.

  Further, the flat motor is configured to support the rotor having the coil disk and the output shaft so as to be rotatable, and provide the magnetic flux generating means so as to face the disk surface of the coil disk. And the magnetic flux generating means may include a magnet.

  The power transmission unit is rotatably supported by the first gear provided on the output shaft of the flat motor, the rotary blade gear fixed to the rotary blade rotary shaft of the rotary blade, and the cutting unit. An intermediate gear that is fixed to the intermediate shaft and provided between the first gear and the rotary blade gear, and when the rotary blade rotary shaft is viewed in the axial direction, the swinging portion is cut into the table portion. The flat motor so that the outer edge of the flat motor and the outer edge of the intermediate gear are farther from the table portion in the first axial direction than the rotary blade rotation shaft in the state of being most oscillated in the direction of approaching the portion. And the intermediate gear is preferably arranged.

  Further, the intermediate shaft has a set of substantially parallel flat surfaces extending in the axial direction of the intermediate shaft, and the cutting portion has an engaging portion that can be engaged with the set of flat surfaces, A lock that is reciprocally movable between a lock position where the engaging portion engages with the flat surface to lock the rotation of the intermediate shaft and a lock release position where the tilt is released and the lock is released. You may have a member.

The lock member may be provided so as to be able to reciprocate in a direction substantially perpendicular to the axial direction of the intermediate shaft.
A tabletop cutting machine according to a second aspect of the present invention includes a base portion on which a workpiece can be placed, a table portion provided on the base portion so as to be rotatable about a first axis, and the first portion. An oscillating portion provided on the table portion so as to be rotatable about a second axis substantially perpendicular to the axis of the oscillating member and oscillating up and down above the table portion; a rotor and a stator; An output shaft, and one of the rotor and the stator has a disk-shaped coil disk provided with a plurality of coils, and the other of the rotor and the stator is the coil disk A flat motor having magnetic flux generating means for generating a magnetic flux passing in the axial direction of the output shaft, so that the axial direction of the output shaft of the flat motor and the axial direction of the second shaft are substantially parallel to each other. A rotary blade that can be attached to the rotary blade rotary shaft in which the axial direction is arranged A power transmission unit for transmitting the power of該扁flat motor to the rotary blade, a, and a cutting portion provided in the swinging portion, and wherein the.

  According to the present invention, by using a flat motor, it is possible to suppress the dimension in the axial direction of the output shaft of the motor of the cutting portion, and it is possible to ensure a wide field of view for the operator.

It is a side view of the desktop circular saw which concerns on embodiment of this invention. It is a front view of the tabletop circular saw of FIG. It is the side view to which the cutting part of the desktop circular saw of FIG. 1 seen from the opposite side to FIG. 1 was expanded. It is the IV-IV sectional view taken on the line of FIG. It is a principal part enlarged view which shows the attachment part of an intermediate shaft and a lock member. It is the VI-VI sectional view taken on the line of FIG. It is a principal part enlarged view which shows the intermediate shaft and the attachment part of a lock member in the state which the lock member moved. FIG. 2 is an exploded sectional view of a rotor of the tabletop circular saw of FIG. 1. It is a top view of the coil commutator disk of the rotor of FIG. It is a top view of the coil disk part of the rotor of FIG. It is a side view which shows the upper body in which the cutting part of the desktop circular saw of FIG. 1 was lowered most. It is sectional drawing of the cutting part in the state of FIG. It is sectional drawing of the cutting part in the state which tilted the cutting part of the desktop circular saw of FIG. FIG. 14 is a cross-sectional view of the cutting portion in a state where the cutting portion of the tabletop circular saw of FIG. 1 is tilted to the opposite side to FIG. 13. It is a side view which shows the modification of the rotor of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, a tabletop circular saw (tabletop cutting machine) 1 includes a base portion 3 that is installed on a floor surface and carries a workpiece 2 such as wood on the upper surface. The base portion 3 is provided with a table rotation shaft (first shaft) 4 extending in the vertical direction in FIG. A turntable (table portion) 5 is attached to the base portion 3 so as to be rotatable about the table rotation shaft 4. The base portion 3 is provided with clamps 38 and 138 for fixing the workpiece 2. A handle 30 is provided near the right end of the turntable 5 in FIG. 1 to be gripped by an operator when the turntable 5 is rotated. Further, in the vicinity of the left end of the turntable 5 in FIG. 1, a tilting shaft 6 (third axis) provided substantially at right angles to the table rotation shaft 4 and extending in the left-right direction in FIG. 1 is provided. Then, as shown by the arrow A in FIG. 2, the tilt shaft 6 can be tilted to the right and left in the upper direction in FIGS. 1 and 2 (from the base portion 3 to the turntable 5 in the axial direction of the first shaft). The tilting portion 7 is attached to the turntable 5 so as to extend in the direction toward the head. In the vicinity of the end of the tilting portion 7 away from the tilting shaft 6, there is provided a slide shaft 8 provided substantially parallel to the tilting shaft 6 and extending in the left-right direction in FIG. Then, as shown by an arrow B, a support portion 10 that supports a slide portion 9 fixed to the slide shaft 8 so as to be slidable left and right in FIG. The slide shaft 8, the slide part 9, and the support part 10 constitute a slide support part 11. The slide portion 9 is provided with a swing shaft (second shaft) 12 provided substantially at right angles to the slide shaft 8 and extending in the left-right direction in FIG. 2, and an arrow C in FIG. As shown, a swinging portion 13 is provided so as to be swingable with respect to the slide portion 9. The swinging portion 13 includes a contact portion that comes into contact with the slide portion 9 when the swinging portion 13 is positioned at a predetermined angle, and a relatively swingable angular region is defined. The swinging portion 13 has a circular saw blade 14 (rotary blade) for cutting the workpiece 2, a flat motor 15 for driving the circular saw blade 14, and the power of the flat motor 15 is circular saw. A cutting portion 19 having a power transmission portion 18 for transmitting to the blade 14 is attached. As shown in FIG. 2, the circular saw blade 14 is attached so that the rotation surface is substantially perpendicular to the swing shaft 12. The cutting unit 19 is provided with a handle 32 that is gripped when the cutting unit 19 is swung toward the turntable 5, and the handle 32 has a trigger switch 34 for controlling the rotation and stop of the flat motor 15. Provided. In addition, the circular saw blade 14 is covered by a saw blade cover 36 fixed to the cutting portion 19 and substantially half of the outer peripheral edge where the saw blade is formed. 2, the clamps 38 and 138 are substantially symmetrical with respect to the table rotation shaft 4 of the turntable 5, or the tilting portion 7 is not tilted (the tilting portion 7 is substantially the same as the table rotation shaft 4). The base portion 3 is provided substantially symmetrically across the circular saw blade 14 in a parallel state.

  As shown in FIG. 3, the flat motor 15 is disposed in the cutting portion 19 so as to be offset with respect to the saw blade rotating shaft (rotating blade rotating shaft) 20 of the circular saw blade 14. A power transmission unit 18 is interposed between the flat motor 15 and the circular saw blade 14.

  As shown in FIG. 4, the flat motor 15 attached to the cutting part 19 has a housing 43 that is assembled by fastening a first housing part 40 and a second housing part 41 with screws 42. In the housing 43, an output shaft 44 protruding from the second housing part 41 is rotatable by a first bearing 45 attached to the first housing part 40 and a second bearing 46 attached to the second housing part 41. Supported by A spur gear-like pinion gear (first gear) 47 is formed near the end of the output shaft 44 protruding from the second housing portion 41. The output shaft 44 has a substantially disc shape formed by laminating a plurality of discs having a plurality of coil patterns formed on the surface between the first bearing 45 and the second bearing 46 via a flange 48. The coil disk 49 is fixed. The output shaft 44, the flange 48, and the coil disk 49 constitute a rotor of the flat motor 15 that rotates integrally.

  Inside the housing 43, the coil disk 49 faces the left disk surface 51 in FIG. 4 in the circumferential direction so that the magnetic flux passes through the coil of the coil disk 49 in the direction of the axis 50 of the output shaft 44. A plurality of magnets 52 such as permanent magnets or electromagnets that are spaced apart from each other and an annular iron yoke 53 are attached to the second housing portion 41. Further, the first housing portion 40 of the housing 43 faces the disc surface 54 on the right side of the coil disk 49 in FIG. 4 with the coil disk 49 interposed therebetween, and the iron yoke 53 in the direction of the axis 50 of the output shaft 44. An annular iron yoke 55 is attached at a position corresponding to. The magnet 52 and the iron yokes 53 and 55 constitute a magnetic flux generating means, but the magnetic flux generating means is limited to this configuration as long as the magnetic flux passes through the coil of the coil disk 49 in the direction of the axis 50 of the output shaft 44. For example, it may be composed of only a plurality of permanent magnets, electromagnets, coils, or the like. Further, a brush 56 for contacting the right disk surface 54 of the coil disk 49 and supplying power to the coil of the coil disk 49 is attached to the first housing portion 40 of the housing 42. The housing 43 provided with these magnets 52 and iron yokes 53 and 55 constitutes a stator of the flat motor 15. The flat motor 15 includes an output shaft 44 as a rotor, a coil disk 49 and a flange 48 fixed to the output shaft 44, magnets 52 and iron yokes 53 and 55 as a stator, and a brush 56. It is configured as a direct current commutator motor.

  As shown in FIG. 4, the intermediate gear 57 meshes with the pinion gear 47 of the output shaft 44 of the flat motor 15. The intermediate gear 57 is fixed to the intermediate shaft 58, and the intermediate shaft 58 is rotatably supported at one end portion by a third bearing 59 attached to the first case 181 of the power transmission unit 18. The intermediate gear 57 meshes with a final gear (rotating blade gear) 100 fixed to the saw blade rotating shaft 20 to which the circular saw blade 14 is attached. The saw blade rotating shaft 20 is rotatably supported by a fourth bearing 102 attached to the first case 181 of the power transmission unit 18 and a fifth bearing 104 attached to the second case 182 of the power transmission unit 18. . The circular saw blade 14 is rotated integrally with the saw blade rotating shaft 20 by the attaching / detaching mechanism 106 and is detachably attached to the saw blade rotating shaft 20. As shown in FIG. 4, the output shaft 44 of the flat motor 15, the intermediate shaft 58 of the intermediate gear 57, and the saw blade rotation shaft 20 of the final gear 100 are arranged so as to be substantially parallel to each other. Further, the output shaft 44, the intermediate shaft 58, and the saw blade rotating shaft 20 are disposed substantially parallel to the swing shaft 12. When the swinging portion 13 swings most in the direction in which the cutting portion 19 is brought closer to the turntable 5 and is in contact with the contact portion (the state shown in FIG. 11), the outer edge of the housing 43 of the flat motor 15 and It is preferable that the flat motor 15 and the intermediate gear 57 are arranged so that the outer edge of the intermediate gear 57 is above the saw blade rotating shaft 20 (in the direction away from the turntable 5). For example, the output shaft 44, the intermediate shaft 58, the saw The blade rotation shaft 20 may be disposed so as to be positioned substantially on the axis 150 as shown in FIG.

  Further, a pair of substantially parallel flat surfaces 110 and 110 extending in the axial direction of the intermediate shaft 58 are formed at the end of the intermediate shaft 58 opposite to the side supported by the third bearing 59. In the first case 181, a plate-like locking member 112 that engages with a pair of flat surfaces 110 and 110 of the intermediate shaft 58 and locks the rotation of the intermediate shaft 58 is substantially the same as the axial direction of the intermediate shaft 58. It is provided so as to be able to reciprocate in a perpendicular direction. As shown in FIG. 5, the locking member 112 is provided substantially in parallel with a distance slightly larger than the distance between the pair of flat surfaces 110 and 110 of the intermediate shaft 58. A pair of engaging portions 114, 114 that can be engaged with each other and an arc-shaped enlarged diameter portion 116 having an inner diameter larger than the maximum width of the intermediate shaft 58 on which the flat surface 110 is formed. As shown in FIG. 6, the lock member 112 is attached to the second case 182 by being biased by the spring 118 in the direction in which the intermediate shaft 58 is positioned in the enlarged diameter portion 116. When the bent part 120 at the end is pushed down in the direction of the arrow D, the engaging part 114 moves in the direction of the intermediate shaft 58. Then, as shown in FIG. 7, when the engaging portion 114 and the flat surface 110 are located substantially in parallel, the engaging portion 114 moves to a position where the flat surface 110 is engaged, and the rotation of the intermediate shaft 58 is locked. To do.

  As shown in FIG. 8, the rotor 60 of the flat motor 15 includes an output shaft 44, a flange 56, and a coil in which a coil / commutator disk 62 and four coil disk portions 63 are stacked in this order from the top in FIG. 8. And a disk 49. The coil / commutator disk 62 and the coil disk portion 63 are printed wiring boards composed of an insulating substrate and a conductor pattern. On the upper surface of the coil / commutator disk 62, there are provided a commutator region 80 in which a commutator (commutator) conductor pattern is formed and a coil region 90a in which a coil conductor pattern is formed. The commutator region 80 and the coil region 90 a are each provided in an annular shape centering on the axis 50 when the output shaft 44 is viewed in the direction of the axis 50, and the coil region 90 a is disposed on the outer peripheral side of the commutator region 80. A coil region 90b for forming a coil conductor pattern is provided on the lower surface of the coil / commutator disk 62. The coil region 90b is provided in an annular shape centering on the axis 50, and is disposed so as to overlap the coil region 90a when viewed in the direction of the axis 50.

  As shown in FIG. 9, a commutator 81 in contact with the brush 56 is formed in the commutator region 80 on the upper surface of the coil / commutator disk 62 by a conductor pattern. The commutator 81 is composed of a plurality of commutator pieces 82 formed radially about the axis 50. A through hole 83 a that penetrates the coil / commutator disk 62 is formed at the outer end of each commutator piece 82.

In addition, a plurality of coil pieces 92 a formed radially around the axis 50 are formed in the coil region 90 a on the upper surface of the coil / commutator disk 62 by a conductor pattern. The inner end of each coil piece 92 a is formed by being directly connected to the corresponding commutator piece 82. Further, the outer end portion of each coil piece 92 a is formed by bending in a predetermined direction around the axis 50. A plurality of through-holes 93a that penetrate the coil / commutator disk 62 are formed at the outer end of each coil piece 92a.

  In the coil area 90b on the lower surface of the coil / commutator disk 62, a plurality of unillustrated coil pieces radially formed around the axis 50 are formed by a conductor pattern substantially the same as the coil area 90a shown in FIG. The The outer end of each coil piece (not shown) is connected to the corresponding coil piece 92a in the coil region 90a via solder filled in the through hole 93a. Further, the inner end of each coil piece (not shown) is connected to the corresponding commutator piece 82 in the commutator region 80 via solder filled in the through hole 83a. As a result, the plurality of coil pieces 92a in the coil region 90a and the plurality of unillustrated coil pieces in the coil region 90b constitute a plurality of coils 91a formed in a substantially U shape when viewed in the direction of the axis 50. The plurality of coils 91 a are arranged in the circumferential direction about the axis 50. In addition, the terminal of each coil 91 a is connected to a corresponding commutator piece 82 in the commutator region 80.

  As shown in FIG. 8, coil regions 90 c and 90 d in which a coil conductor pattern is formed are provided on the upper and lower surfaces of the coil disk portion 63, respectively. The coil regions 90c and 90d are each provided in an annular shape centering on the axis 50, and are disposed so as to overlap the coil regions 90a and 90b of the coil / commutator disk 62 when viewed in the direction of the axis 50.

  In the coil areas 90c and 90d of the coil disk portion 63, conductor patterns substantially the same as the coil areas 90a and 90b of the coil / commutator disk 62 are formed. As shown in FIG. 10, a plurality of coil pieces 92 c that are formed radially about the axis 50 are formed in the coil region 90 c on the upper surface of the coil disk portion 63. A plurality of coil pieces (not shown) are formed in the coil area 90d on the lower surface of the coil disk portion 63 by a conductor pattern substantially the same as that of the coil area 90c. A plurality of coil pieces 92c in the coil region 90c and a plurality of coil pieces (not shown) in the coil region 90d are connected to each other via solder filled in through holes 83c and 93c penetrating the coil disk 62, and the direction of the axis 50 A plurality of coils 91c formed in a substantially U shape when viewed are configured. The plurality of coils 91 c are arranged in the circumferential direction about the axis 50. The end of each coil 91c is connected to a corresponding commutator piece 82 in the commutator region 80 via solder filled in the through hole 83a of the coil / commutator disk 62.

  The conductor patterns of the commutator region 80 and the coil region 90a of the coil / commutator disk 62 are formed on the same printed wiring. Further, the conductor patterns of the commutator region 80 and the coil region 90a of the coil / commutator disk 62 are thicker than the coil region 90b and the coil regions 90c and 90d of the coil disk portion 63 in order to prevent damage due to wear with the brush 56. It is formed.

  Between the coil / commutator disk 62 and the coil disk part 63, and the plurality of coil disk parts 63, for example, coils 91a and 91c are overlapped with each other when viewed in the direction of the axis 50 through an insulating layer (not shown). Alternatively, the coils 91a and 91c are stacked so as to be arranged around the axis 50 with a predetermined angle.

  According to the desktop circular saw 1 configured as described above, when the trigger switch 34 of the handle 32 is turned ON, a predetermined voltage is applied to the brush 56. The voltage applied to the brush 56 is applied to the coils 91 a and 91 c formed on the coil disk 49 via the commutator 81. A current flows through the coils 91a and 91c to which a voltage is applied, in a substantially radial direction of the coil disk 49 perpendicular to the direction of the axis 50 of the output shaft 44, and the flow direction is controlled by the commutator 81. On the other hand, the magnetic flux generated by the magnet 52 passes through the coil disk 49 orthogonal to the current in the direction of the axis 50 of the output shaft 6. Therefore, torque is generated in the coil disk 49 in the circumferential direction of the coil disk 49 about the axis 50, and the output shaft 44 rotates together with the coil disk 49. The rotation of the output shaft 44 is transmitted from the pinion gear 47 of the output shaft 44 to the intermediate gear 57 in the power transmission unit 18 and is transmitted to the circular saw blade 14 via the final gear 100, and the circular saw blade 14 rotates. .

  When the workpiece 2 is cut, the turntable 5 is adjusted to a desired position, and the cutting portion 19 is pushed down by the handle 32 as shown in FIGS. Further, in the case of performing inclined cutting on the workpiece 2, as shown in FIGS. 13 and 14, the cutting part 19 is pushed down by the handle 32 with the tilting part 7 tilted around the tilting axis 6. To perform cutting work. In this case, the shaft 50 of the output shaft 44 of the flat motor 15 is compared with a motor having a coil wound around a so-called core by using the flat motor 15 having a coil formed in the disk of the coil disk 49. The dimension in the direction can be greatly suppressed, and the field of view of the worker during the cutting operation can be secured widely. Further, since the flat motor 15 having the above-described configuration has a coil formed of a printed wiring board in a disk, the coil disk 49 is lighter than a motor having a coil wound around a so-called core. Therefore, there is an advantage that the start-up is quick when the trigger switch 34 is turned on. Moreover, even when tilting the cutting part 19 to the side where the flat motor 15 is attached, as shown in FIG. 15, the power transmission unit 18, etc. are prevented from contacting the workpiece 2, the tilt angle can be increased, and the clamp 138 disposed on the flat motor 15 side is brought closer to the circular saw blade 14 side. Therefore, the clamps 38 and 138 can be provided substantially symmetrically with the turntable 5 interposed therebetween. For this reason, since it becomes possible to make the space | interval of the clamps 38 and 138 small, it becomes possible to fix to the small workpiece 2 using the clamps 38 and 138, and workability | operativity is improved significantly. be able to.

  As shown in FIG. 12, a power transmission unit 18 having an intermediate gear 57 is interposed between the flat motor 15 and the circular saw blade 14, and the outer edge of the housing 43 of the flat motor 15 and the outer edge of the intermediate gear 57 are Since the flat motor 15 and the intermediate gear 57 are arranged so as to be above the saw blade rotating shaft 20, even when the flat motor 15 is used, the flat motor 15 contacts the workpiece 2 at the time of cutting. The flat motor 15 and the intermediate gear 57 do not affect the cutting depth of the circular saw blade 14.

  Further, since the set of flat surfaces 110 and 110 and the lock member 112 for locking the rotation of the intermediate shaft 58 are provided, the saw blade rotating shaft 20 can be easily obtained by locking the rotation of the intermediate shaft 58. The rotation of the saw blade 14 can be locked, and the saw blade 14 can be easily replaced. Further, since the rotation of the intermediate shaft 58 provided with no function other than the rotation transmission function is locked, the spindle lock mechanism is provided on the saw blade rotating shaft 20 to which the output shaft 44 of the flat motor 15 and the circular saw blade 14 are attached. In comparison, it is not necessary to lengthen the output shaft 44 and the saw blade rotating shaft 20 in the axial direction in order to provide the spindle lock mechanism. For this reason, it becomes possible to suppress the length of the cutting part 19 in the axial direction of the output shaft 44, and even when the cutting part 19 is tilted to the side where the flat motor 15 is attached as shown in FIG. In addition, it is possible to secure a wide field of view. Further, since the lock member 112 moves in a direction perpendicular to the axial direction of the intermediate shaft 55, a little space is required in the axial direction of the intermediate shaft 55 in order to secure the moving direction of the lock member 112, and the output of the cutting portion The axial length of the shaft can be further suppressed, the tilt angle can be increased, and the field of view can be secured wider.

  In the above-described embodiment, the table-top circular saw 1 has the tilting part 7 that tilts the cutting part 19 around the tilting axis 6 and the slide part 9 that slides the cutting part in the direction of the sland axis 8. It is not necessary to provide the tilting part 6 and the slide part 9. For example, a tabletop circular saw with a tilting part 7 without a slide part 9, a tabletop circular saw with a slide part 9 without a tilting part 7, or both the tilting part 7 and the slide part 9 are provided. There may be no tabletop circular saw. In the above-described embodiment, the commutator 81 including a plurality of commutator pieces 82 arranged radially about the shaft 50 on the disk surface of the coil / commutator disk 62 constituting the coil disk 49 is provided. The brush 56 is in contact with the commutator 81 in the direction of the axis 50 (perpendicular to the disk surface). However, the configuration of the commutator and the brush is not limited to such a configuration. For example, as shown in FIG. 15, instead of the commutator 81 in the commutator area 80 of the coil / commutator disk 62, a cylindrical commutator 281 extending coaxially with the output shaft 244 is provided on the upper surface of the coil disk 249, and the commutator 281 is provided with this commutator 281. On the other hand, the brush 256 may be brought into contact with the output shaft 244 from a direction orthogonal to the shaft 250.

  When the commutator 281 and the brush 256 are configured in this way, the brush 256 is in contact with the commutator 281 perpendicular to the direction of the axis 250 of the output shaft 244, so that it is difficult for the coil disk 249 to run out of the surface and the brush 256. Thus, it is possible to reliably supply current to the coil. Moreover, it becomes easy to form each commutator piece of the commutator 281 thickly, the durability of the commutator 281 is improved, and the life of the tabletop circular saw 1 can be extended.

  In any of the above-described embodiments, the flat motor 15 is used in which the coil disk 49 rotates as a part of the rotor and the magnet 52 is fixed to the housing 43. The desktop circular saw 1 of the present invention is not limited to this. For example, a flat brushless motor may be used in which a magnet forms a stator that rotates integrally with the output shaft 44 and a coil disk forms a stator that is fixed to a housing. Furthermore, the coil disk does not necessarily need to be provided with a coil disk composed of a printed wiring board. If the coil disk can be formed into a flat and small shape, for example, a plurality of coils arranged in a disk shape can be used. A motor provided with the coil coil comprised may be sufficient.

DESCRIPTION OF SYMBOLS 1 Desktop circular saw 2 Workpiece member 3 Base part 4 Table rotating shaft 5 Turntable 6 Tilt shaft 7 Tilt part 8 Slide shaft 9 Slide part 12 Swing shaft 13 Swing part 14 Circular saw blade 15 Flat motor 18 Power transmission part 19 Cutting part 43 Housing 44 Output shaft 49 Coil disk 52 Magnet 53 Iron yoke 55 Iron yoke 56 Brush 57 Intermediate gear 58 Intermediate shaft 110 Flat surface 112 Lock member 114 Engagement part

Claims (8)

A base portion on which a workpiece can be placed;
A table portion provided on the base portion so as to be rotatable around a first axis;
A swinging portion provided on the table portion so as to be rotatable around a second axis substantially orthogonal to the first shaft and swinging up and down above the table portion;
And a rotating rotor and a stator, the rotor having an output shaft, one of the said rotor stator in the circumferential direction around the output shaft as viewed in the axial direction of the output shaft It has a disk-shaped coil disk provided with a plurality of substantially annular coils arranged, and one of the rotor and the stator generates a magnetic flux that passes through the coil disk in the axial direction of the output shaft. having a magnetic flux generating means for a flat motor, mountable to the rotary blade rotating shaft axial direction is arranged to be substantially parallel to the axis directions of the axial and the second axis of the output shaft of該扁flat motor A rotary blade, and a power transmission portion that transmits the power of the flat motor to the rotary blade, and a cutting portion provided in the swing portion,
A tabletop cutting machine characterized by that. Between the table part and the swing part, the second part is attached to the table part so as to be rotatable about a third axis substantially orthogonal to the first axis and the second axis. A tilting portion is provided to support the swinging portion so as to be rotatable about an axis;
The tabletop cutting machine according to claim 1, wherein: Between the tilting part and the swinging part, a slide support part for supporting the swinging part on the tilting part is provided so as to be movable substantially parallel to the axial direction of the third shaft.
The tabletop cutting machine according to claim 2, wherein: The flat motor is
The rotor having the coil disk;
The output shaft is rotatably supported, and the magnetic flux generating means is provided so as to face the disk surface of the coil disk.
The magnetic flux generating means includes a magnet.
The tabletop cutting machine according to any one of claims 1 to 3, wherein the tabletop cutting machine is provided. The power transmission unit includes a first gear provided on the output shaft of the flat motor, a rotary blade gear fixed to the rotary blade rotary shaft of the rotary blade, and an intermediate supported rotatably on the cutting unit. An intermediate gear fixed to a shaft and provided between the first gear and the rotary blade gear,
In an axial view of the rotary blade rotating shaft, the outer edge of the flat motor and the outer edge of the intermediate gear are in the state where the outer edge of the flat motor and the outer edge of the intermediate gear are in a state where the swinging part swings most in the direction in which the cutting part is brought closer to the table part The flat motor and the intermediate gear are disposed so as to be farther from the table portion in the first axial direction than the rotation shaft.
The tabletop cutting machine according to any one of claims 1 to 4, wherein the tabletop cutting machine is provided. The intermediate shaft has a set of substantially parallel flat surfaces extending in the axial direction of the intermediate shaft,
The cutting portion has an engaging portion that can engage with the set of flat surfaces, and the locking portion engages with the flat surface to lock the rotation of the intermediate shaft and the tilt. A lock member provided so as to be able to reciprocate between the lock release position for releasing the lock and releasing the lock,
The tabletop cutting machine according to claim 5, wherein: The lock member is provided to be able to reciprocate in a direction substantially perpendicular to the axial direction of the intermediate shaft.
The tabletop cutting machine according to claim 6. A base portion on which a workpiece can be placed;
A table portion provided on the base portion so as to be rotatable around a first axis;
A swinging portion provided on the table portion so as to be rotatable around a second axis substantially orthogonal to the first shaft and swinging up and down above the table portion;
A rotor and a stator, wherein the rotor has an output shaft, and one of the rotor and the stator has a disk-shaped coil disk provided with a plurality of coils, and the rotation The other of the child and the stator has a flat motor having magnetic flux generating means for generating a magnetic flux passing through the coil disk in the axial direction of the output shaft, the axial direction of the output shaft of the flat motor, and the second A rotary blade that can be attached to the rotary blade rotary shaft, the axial direction of which is arranged so as to be substantially parallel to each axial direction of the shaft, and a power transmission unit that transmits the power of the flat motor to the rotary blade. A cutting part provided in the swinging part,
A tabletop cutting machine characterized by that.

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