JP5305229B2 - Cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool which reduces size of configuration around a rotating axis of a cutting blade. <P>SOLUTION: The cutting tool includes: a drive part 5 for driving a cutting blade 7; a cutting part 4 for rotatably supporting the cutting blade 7; and a transmission mechanism 6 for transmitting the power of the drive part 5 to the cutting blade 7. The transmission mechanism 6 has a first roller 62C and a second roller 63C which sandwich the cutting blade 7 between one side surface and the other side surface of the cutting blade 7. The respective axes of the first roller 62C and the second roller 63C are arranged in almost parallel with the radial direction of the cutting blade 7. At least first roller 62C is connected with the drive part 5 so as to be rotated. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a cutting tool, and more particularly to a cutting tool having a rotating cutting blade.

2. Description of the Related Art Conventionally, for example, in a tabletop cutting machine, as shown in Patent Document 1, a spindle that fixes a cutting blade and a gear that rotates coaxially with the spindle are provided on the rotary shaft portion of the cutting blade, and a motor is connected to this gear. ing. In this configuration, by driving the motor, the gear is rotated, the cutting blade integrated with the gear is rotated, and the workpiece is cut.
JP 2003-145501 A

  The cutting depth of the cutting blade is defined by the distance from the outer periphery of the cutting blade to a peripheral member (for example, a housing that houses a gear or the like) of the rotary shaft portion of the cutting blade. Therefore, in order to increase the cutting depth, it is necessary to enlarge the cutting blade or downsize the peripheral members.

  If the cutting blade is made large, the cutting tool itself becomes large, and the unit price of the cutting blade tends to increase, which is not preferable. Further, when the above-mentioned gear is made small in order to reduce the size of the peripheral members, the tangential force of the gear is increased, the load on the gear is increased, and the durability may be inferior.

  Therefore, an object of this invention is to provide the cutting tool which reduced the structure around the rotating shaft of a cutting blade.

In order to solve the above-described problems, the present invention provides a driving unit that drives a cutting blade that cuts a workpiece, a cutting unit that rotatably supports the cutting blade, and the cutting unit that uses the power of the driving unit. A transmission mechanism for transmitting to the cutting blade, the transmission mechanism having a first roller and a second roller for sandwiching the cutting blade between one side surface and the other side surface of the cutting blade, and at least the The first roller is connected to the drive unit and is driven to rotate , and the first roller and the second roller have their respective rotation axes arranged substantially parallel to the radial direction of the cutting blade, and the cutting blade A rotating shaft portion is interposed between the cutting portion and the cutting portion so as to rotatably support the cutting blade with respect to the cutting portion. this having a first shaft supported in one bearing, the second shaft detachably to said uniaxial supported by the second bearing of the other side surface side Providing a cutting tool according to claim.

  According to such a configuration, the cutting blade can be rotationally driven without using the power transmission means in the rotating shaft portion. Therefore, there is no need to dispose a gear or the like around the rotation axis of the cutting blade, and the configuration around the rotation axis of the cutting blade can be simplified and reduced in size at the cutting portion. Further, the cutting depth can be increased without downsizing the cutting blade. In particular, when the cutting blade is tilted, there is no constituent member in the vicinity of the rotation axis of the cutting blade, so that the cutting depth can be significantly increased. Further, since the cutting blade is directly sandwiched, the cutting blade can be prevented from swinging and the cutting accuracy can be improved.

  According to such a configuration, since the respective rotation axes of the first roller and the second roller are substantially parallel to the radial direction of the cutting blade, the rotational force of the first roller and the second roller is efficiently transmitted to the cutting blade. be able to.

  According to such a configuration, bearings that support the rotating shaft portion are disposed on both sides of the cutting blade, so that the accuracy of holding the cutting blade is improved, and the cutting accuracy can be further improved.

  Moreover, it is preferable that either one of the first roller and the second roller is configured to be separated from the side surface of the cutting blade.

  According to such a configuration, by separating at least one of the rollers from the cutting blade, the structure in which the cutting blade is clamped is released, and the cutting blade can be easily attached and detached.

  Moreover, it is preferable that this cutting | disconnection part is equipped with the urging means which urges | biases at least one of this 1st roller and this 2nd roller to this cutting blade from either the 1st surface side or this other surface side. .

  According to such a configuration, since at least one of the first roller and the second roller urges the cutting blade, the contact state between the first roller and the second roller and the cutting blade can be kept stable. Can do.

  It is preferable that the first roller and the second roller are configured to be able to approach and separate from the cutting blade, respectively.

  According to such a configuration, the first roller and the second roller can move individually with respect to the cutting blade. Therefore, the contact state between the first roller and the cutting blade and the contact state between the second roller and the cutting blade can be individually controlled, and the contact state between the first roller and the second roller and the cutting blade can be further controlled. It can be kept stable.

  Further, it is preferable that the first roller and the second roller are respectively connected to the driving unit and rotationally driven in opposite directions. According to such a configuration, the cutting blade can be driven by both the first roller and the second roller. Therefore, the transmission efficiency of power to the cutting blade is improved, and the cutting blade can be driven to rotate stably.

  The driving unit is preferably provided with a fan for cooling the driving unit, and fan air generated from the fan is preferably exhausted toward the first roller and the second roller.

  According to such a structure, the sawdust etc. which adhere to a 1st roller and a 2nd roller can be blown away. Therefore, it is suppressed that the contact location of a 1st roller and the 2nd roller, and a cutting blade is contaminated with saw dust etc., and the transmission efficiency of the motive power to a cutting blade can be improved. Further, since the first roller and the second roller are cooled by the fan air, heat generation of the first roller and the second roller can be suppressed, and the life can be improved.

  The drive unit has an output shaft portion, and is arranged such that the axial direction of the output shaft portion and the axial directions of the rotation shafts of the first roller and the second roller are substantially parallel to each other. Is preferred.

  According to such a structure, the output of a drive part can be transmitted to a 1st roller and a 2nd roller by simple transmission means, such as a spur gear.

  Also, a base part that supports the processing member, and a support that is interposed between the base part and the cutting part and that can tilt the cutting part with respect to the base part in a direction perpendicular to the side surface of the cutting blade. May further be provided.

  According to such a configuration, since the periphery of the rotating shaft portion of the cutting portion is miniaturized, even if the cutting portion is tilted, the periphery of the rotating shaft portion of the cutting portion is suppressed from coming into contact with the processing member. Therefore, the cutting depth can be increased when the cutting portion is inclined to perform the inclined cutting. Further, the tilt angle of the cutting part can be further increased.

  The support portion includes a first support portion connected to the base portion and a second support portion for supporting the cutting portion, and the second support portion is formed on the base with respect to the first support portion. You may connect so that a movement in the direction parallel to a part upper surface and the side surface of this cutting blade is possible.

According to such a configuration, the cutting blade can be slid, so that the cutting application is improved. According to another aspect of the present invention, a driving unit that drives a cutting blade that cuts a processing member, a cutting unit that rotatably supports the cutting blade, and the cutting unit transmits power of the driving unit to the cutting blade. A transmission mechanism that transmits the cutting blade between the one side surface and the other side surface of the cutting blade, and at least the first roller The roller is connected to the drive unit and is driven to rotate, and the drive unit is provided with a fan for cooling the drive unit, and the fan air generated from the fan is directed to the first roller and the second roller. A cutting tool is provided which is characterized by being evacuated.

  According to the cutting tool of the present invention, the configuration around the rotating shaft of the cutting blade can be reduced in size and durability can be ensured.

  A cutting tool according to an embodiment of the present invention will be described with reference to FIGS. A tabletop cutting machine 1 that is a cutting tool shown in FIG. 1 is mainly composed of a base part 2, a support part 3, a cutting part 4, and a cutting blade 7, and the cutting part 4 with respect to the base part 2. Is configured to be tiltable in a direction perpendicular to the side surface of the cutting blade 7. The cutting blade 7 is formed in a disk shape, and has a through-hole through which a bolt 44B (FIG. 3) described later passes in the center, and a blade for cutting the wood W on the outer periphery.

  The base portion 2 is mainly composed of a base 21 that supports a wood W that is a member to be cut, a turntable 22 that is rotatably supported on the base 21, and a fence 23 that is provided on the base 21. Yes. As shown in FIG. 2, the base 21 includes a pair of a left base 21A and a right base 21B. The direction in which the left base 21A and the right base 21B are arranged is defined as the left-right direction, and the upper side of the surface of the base 21 on which the wood W (FIG. 1) is placed is defined as the upper side and the opposite side is defined as the lower side.

  As shown in FIG. 2, the turntable 22 is disposed between the right base 21B and the left base 21A. As shown in FIG. 1, the turntable 22 includes a turntable main body portion 22A having a substantially circular shape, a projecting portion 24 projecting to one side of the turntable main body portion 22A, and a support portion 3 described later provided on the other side. The cutting part support part 27 (FIG. 1) to support is comprised. The direction in which the protruding portion 24 protrudes from the turntable and is orthogonal to the left-right direction is defined as the front and the opposite is defined as the rear.

  A series of grooves (not shown) are formed on the upper surface 22 </ b> B of the turntable 22 from the vicinity of the cutting portion support portion 27 to the protruding portion 24. The groove portion (not shown) is a position that is in the same position as the line of intersection when the cutting blade 7 swings downward and crosses the turntable 22 and accommodates the cutting edge of the cutting blade 7.

  As shown in FIGS. 1 and 2, the projecting portion 24 is provided with a regulating operation portion 28 that serves as an operating portion when regulating the rotation of the turntable 22 relative to the base 21. As shown in FIG. 1, the cutting portion support portion 27 is disposed at a position opposite to the protruding portion 24 with respect to the central axis of the turntable 22. The cutting part support part 27 has a tilting shaft 27A located on an extension line of a groove part (not shown) and a tilting support part 27B standing upright from the rear end part. As shown in FIG. 2, the tilting support portion 27B is formed with an arc-shaped long hole 27b that penetrates in the front-rear direction and extends in the left-right direction. A clamp 31A described later is inserted into the long hole 27b.

  As shown in FIG. 1, a fence 23 is provided on the base 21 and above the turntable 22. As shown in FIG. 2, the fence 23 includes a left fence 23A and a right fence 23B corresponding to the left base 21A and the right base 21B, and the front surfaces of the left fence 23A and the right fence 23B are on the same plane. The position of the wood W (FIG. 1) is defined.

  As shown in FIG. 1, the support portion 3 mainly includes a tilting portion 31, a slide support portion 33, a slide portion 34, and a swing support portion 35. The tilting portion 31 is a first support portion and is supported by the turntable 22 by a tilting shaft 27A, and the clamp 31A is screwed together. Since the clamp 31A is inserted into the elongated hole 27b of the tilt support portion 27B, the tilt portion 31 is fixed to the tilt support portion 27B by tightening the clamp 31A, and the tilt portion 31 is left and right by loosening the clamp 31A. Can be tilted. Further, since the clamp 31A is inserted into the long hole 27b, the angle at which the tilting part 31 can tilt with respect to the tilting support part 27B is limited to a range in which the clamp 31A can move within the long hole 27b.

  The slide support part 33 has two cylindrical parts, and is provided integrally with the tilting part 31 at the upper part of the tilting part 31. The slide part 34 includes two slide pipes 34 </ b> A and 34 </ b> B (FIG. 2) inserted into the two cylindrical parts of the slide support part 33, and the two slide pipes 34 </ b> A and 34 </ b> B are included in the slide support part 33. It can be moved back and forth by sliding with respect to. Further, a knob 33 </ b> B that can be screwed to protrude into the cylinder of the slide support portion 33 is screwed to the slide support portion 33. Therefore, the slide pipes 34 </ b> A and 34 </ b> B can be fixed to the slide support portion 33 by screwing the knob 33 </ b> B. In addition, the slide support part 33 and the slide part 34 are configured such that the slide direction is parallel to the upper surface of the base part 2 and the side surface of the cutting blade 7.

  The swing support portion 35 is a second support portion and is configured integrally with the slide portion 34, and is configured by a pair of arm portions as shown in FIG. A swinging shaft portion 35A is passed between the pair of arm portions, the cutting portion 4 is swung around the swinging shaft portion 35A as an axis, and the cutting blade 7 approaches and separates from the upper surface of the turntable 22. I support it.

  The cutting part 4 is configured with a housing 4A pivotally supported by the swing shaft part 35A as an outer shell. As shown in FIG. 3, the housing 4 </ b> A includes a housing portion 41 and a motor 5, and a transmission mechanism 6 is disposed therein, and includes a handle 4 </ b> B (FIG. 1) that serves as a gripping portion at the time of cutting. ing.

  The accommodating portion 41 extends to one side and the other side of the cutting blade 7 at the central axis position of the cutting blade 7 and defines a space 41a for accommodating a part of the upper side of the cutting blade 7. 7 is provided with a rotation shaft portion 42 that rotatably supports the shaft 7.

  The rotary shaft portion 42 is mainly composed of a first bearing 43A, a second bearing 43B, a saw blade shaft portion 44A, a bolt 44B, a flange 44C, and a wheel washer 44D. 43 A of 1st bearings are mounted | worn with the accommodating part 41 located in the right side surface side which is one side of the cutting blade 7. FIG. The second bearing 43 </ b> B is a housing portion 41 that is located on the left side that is the other side of the cutting blade 7, and is provided at a position opposite to the anti-first bearing 43 </ b> A via the cutting blade 7. One end portion of the saw blade shaft portion 44A is mounted on the first bearing 43A, and is configured to be rotatable with respect to the housing portion 41. Further, a screw hole 44a is formed at the other end portion of the saw blade shaft portion 44A. The screw hole 44a is opened at the other end portion and screwed into the bolt 44B. The bolt 44B passes through the second bearing 43B and is rotatably supported by the second bearing 43B. The bolt 44B is screwed into the screw hole 44a and rotates coaxially with the saw blade shaft portion 44A. The flange 44C is fixed to the other end portion of the saw blade shaft portion 44A so as to rotate integrally with the saw blade shaft portion 44A, and receives the cutting blade 7. A hole through which the bolt 44B passes is formed in the wheel washer 44D, and the cutting blade 7 is held together with the flange 44C when the bolt 44B is screwed to the saw blade shaft portion 44A. With the cutting blade 7 held between the flange 44C and the wheel washer 44D, the bolt 44B passes through the hole of the wheel washer 44D and is screwed into the screw hole 44a, so that the cutting blade 7 is held on the rotating shaft portion 42. Since the rotation shaft portion 42 can be rotated with respect to the housing portion 41 by the bolt 44B and the saw blade shaft portion 44A, the cutting blade 7 held by the rotation shaft portion 42 can be rotated with respect to the housing portion 41. Become. Moreover, since the rotating shaft part 42 is rotatably held with respect to the accommodating part 41 by both the first bearing 43A and the second bearing 43B, the cutting blade 7 held by the rotating shaft part 42 is both supported. It becomes a configuration to be retained. Therefore, the precision which hold | maintains the cutting blade 7 in the accommodating part 41 improves, and it can improve a cutting precision more.

  As shown in FIGS. 1 and 3, the housing 4 </ b> A has a second roller holding portion 45 that holds a second roller portion 63 (described later) at an upper position of the housing portion 41. As shown in FIG. 3, the second roller holding portion 45 has a second swing shaft portion 45 </ b> A that is perpendicular to the second roller portion 63 described later and parallel to the cutting blade 7 at a position above the second roller portion 63. It is slidably connected to the housing 4A via the second oscillating shaft 45A. Further, the second roller holding portion 45 is provided with a counterclockwise biasing force against the housing 4A to the second roller holding portion 45 when the desktop cutter 1 is viewed from the front above the second swing shaft portion 45A. A spring 45B is provided. The second roller 63C presses the side surface of the cutting blade 7 by the biasing force of the spring 45B.

  The motor 5 is configured by arranging a rotor 51 in a motor housing 5A. The motor housing 5A is connected to the housing 4A at the front end side from which an output shaft portion 51A, which will be described later, protrudes, and an air hole 5a that takes in outside air by a fan 52, which will be described later, is formed at the rear end side. The rotor 51 has an output shaft portion 51A. The motor 5 is mounted on the housing 4A so that the output shaft portion 51A is parallel to the rotation shafts of a first roller portion 62 and a second roller portion 63 described later. ing. A pinion gear 6A is provided at the tip of the output shaft portion 51A, and the pinion gear 6A is disposed at the position of the transmission mechanism 6 in the housing 4A. The fan 52 is fixed to the base end of the output shaft portion 51A so as to rotate coaxially with the output shaft portion 51A. In the housing 4A, a passage 4a that connects the space 41a and the motor housing 5A is formed at a position adjacent to the space 41a, in the vicinity of the first roller 62C and the second roller 63C, which will be described later, and in the vicinity of the fan 52. Yes. Therefore, the fan wind blows into the space 41a through the passage 4a.

  The transmission mechanism 6 is mainly composed of a flat gear 61, a first roller portion 62, and a second roller portion 63. The spur gear 61 is a spur gear, and is rotatably supported by the housing 4A so that the rotation shaft is parallel to the output shaft portion 51A and meshes with the pinion gear 6A.

  The first roller portion 62 includes a first gear 62A that is a spur gear, a first shaft portion 62B in which the first gear 62A is disposed on the upper end side and rotates integrally with the first gear 62A, and a lower end of the first shaft portion 62B. It is comprised from the 1st roller 62C which is arrange | positioned at the side and rotates coaxially integrally with the 1st axial part 62B. Further, the first roller portion 62 is seen from a direction orthogonal to the side surface of the cutting blade 7 so that the rotation axis of the first roller portion 62 coincides with a virtual axis extending in the radial direction through the center of the cutting blade 7. The housing 4A is rotatably supported. The first gear 62A meshes with the flat gear 61, and is rotatably supported by the housing 4A at the upper end side position and the lower end side position of the first gear 62A. The first shaft portion 62B is disposed on the right side of the cutting blade 7 and extends into the space 41a. The first roller 62 </ b> C is made of a resin such as rubber or metal, and is disposed in the space 41 a, and the cutting blade 7 is arranged so that the circumferential direction at the contact point with the cutting blade 7 is orthogonal to the radial direction of the cutting blade 7. The driving force is transmitted to the cutting blade 7 in contact with the right side surface. In other words, the driving force of the motor 5 can be transmitted to the cutting blade 7 without using the rotating shaft portion 42. Therefore, there is no need to dispose a gear or the like on the housing 4A around the rotation axis of the cutting blade 7, and the portion of the housing 4A located around the rotation axis of the cutting blade 7 can be simplified and reduced in size.

  Since the pinion gear 6A to the first gear 62A are all constituted by spur gears whose rotation axes are parallel, the configuration is simple and transmission efficiency is enhanced. The pinion gear 6A to the first gear 62A need only have parallel rotation axes. Therefore, the pinion gear 6A is not limited to a spur gear, and may be a gear having a parallel rotation axis such as a bevel gear.

  The second roller portion 63 includes a second shaft portion 63B and a second roller 63C that is disposed on the lower end side of the second shaft portion 63B and rotates integrally with the second shaft portion 63B. When viewed from the direction orthogonal to the side surface, the second roller portion 63 is rotatably attached to the second roller holding portion 45 so that the rotation axis of the second roller portion 63 coincides with a virtual axis extending in the radial direction through the center of the cutting blade 7. Yes. The second shaft portion 63B is positioned below the second swing shaft portion 45A, is rotatably supported by the second roller holding portion 45 via a bearing at the upper end portion, and the lower end side extends into the space 41a. Has been. Like the first roller 62C, the second roller 63C is made of resin such as rubber or metal, and is disposed in the space 41a, and the circumferential direction at the contact point with the cutting blade 7 is the radial direction of the cutting blade 7. It contacts the right side surface of the cutting blade 7 so as to be orthogonal.

  Therefore, the first roller 62C and the second roller 63C have their respective rotational axes substantially parallel to the side surface of the cutting blade 7 and substantially parallel to the radial direction, and the circumferential direction at the contact point with the cutting blade 7 is the radial direction. It is arranged so as to be orthogonal to With such a configuration, the rotational force of the first roller 62C is efficiently transmitted to the cutting blade 7, and the occurrence of friction in the diameter direction of the cutting blade 7 between the second roller 63C and the cutting blade 7 is suppressed. The cutting blade 7 can be rotated efficiently.

  As described above, the second roller holding portion 45 that supports the second roller portion 63 is biased counterclockwise by the spring 45B with the second swinging shaft portion 45A as a fulcrum. The second roller 63 </ b> C positioned below the swinging shaft portion 45 </ b> A is biased to the left side surface of the cutting blade 7. Since the first roller 62C is disposed on the opposite side of the cutting blade 7 of the second roller 63C, when the second roller 63C is urged, the cutting blade is cut between the first roller 62C and the second roller 63C. 7 is sandwiched. As a result, the driving force of the first roller 62C is transmitted to the cutting blade 7 via a frictional force. By sandwiching the cutting blade 7 between the first roller 62C and the second roller 63C, The frictional force with the cutting blade 7 is increased, and the driving force of the first roller 62C can be suitably transmitted to the cutting blade 7. Further, since the cutting blade 7 is directly sandwiched between the first roller 62C and the second roller 63C, the swing of the cutting blade 7 can be suppressed, and the cutting accuracy can be improved.

  Chips generated at the time of cutting the wood W enter between the first roller 62C and the second roller 63C and the cutting blade 7, and chips come into contact with the cutting blade 7 of the first roller 62C and the second roller 63C. May adhere. However, since the fan wind that has passed through the passage 4a is blown to the first roller 62C and the second roller 63C as described above, the chips are blown off, and the gap between the first roller 62C and the second roller 63C and the cutting blade 7 is lost. It is possible to prevent chips from entering. Further, since friction force is interposed between the first roller 62C and the second roller 63C and the cutting blade 7, the first roller 62C and the second roller 63C may be heated and deteriorated. However, since the fan wind is blown to the first roller 62C and the second roller 63C, the heat generation of the first roller 62C and the second roller 63C can be suppressed, and the life can be improved.

  In the conventional tabletop cutting machine, since the gear is connected to the rotating shaft portion, when the cutting portion is tilted, the vicinity of the rotating shaft portion of the housing is in contact with the processing member and the tilt angle cannot be obtained. . However, as shown in FIG. 4, in the tabletop cutting machine 1 according to the present embodiment, since a gear or the like is not connected to the rotating shaft portion 42, the housing 4A in the vicinity of the rotating shaft portion 42 is configured compactly and tilted to the right. In this case, the housing 4A in the vicinity of the rotation shaft portion 42 does not hinder the tilting operation of the cutting portion 4. Therefore, the cutting angle of the tabletop cutting machine 1 can be taken large.

  Further, the cutting depth of the cutting blade 7 is defined by the distance from the outer periphery of the cutting blade 7 to the housing 4A in the vicinity of the rotary shaft portion 42, but the housing 4A in the vicinity of the rotary shaft portion 42 is configured compactly. The cutting depth can be increased with the cutting blade 7. Therefore, even if the cutting blade 7 has a small diameter, the same performance as that of the large-diameter cutting blade of the conventional tabletop cutting machine can be obtained. Moreover, the desktop cutter 1 can be reduced in size by making the cutting blade 7 into a small diameter.

  Further, when the cutting blade 7 is detached from the cutting portion 4, the second roller holding portion 45 tilts as shown in FIG. 5, so that a gap is formed between the first roller 62C and the second roller 63C. The cutting blade 7 can be easily taken out between the first roller 62C and the second roller 63C, and can be easily inserted between the first roller 62C and the second roller 63C.

  The cutting tool by this invention is not limited to embodiment mentioned above, A various improvement and deformation | transformation are possible in the range described in the claim. For example, as shown in FIG. 6, the saw blade shaft portion 144 </ b> A that holds the cutting blade 7 may have a cantilever support structure. In this configuration, a bearing 144C composed of two bearings is provided in the accommodating portion 141 located on the right side of the cutting blade 7, and the saw blade shaft portion 144A is rotatably supported by the bearing 144C. The cutting blade 7 is mounted on the saw blade shaft portion 144A with a bolt 144B and a wheel washer 144D. According to such a configuration, since the accommodating portion 141 which is a part of the housing 4A does not exist on the left side of the cutting blade 7 and in the vicinity of the bolt 144B, the cutting blade 7 can be easily attached and detached.

  Further, as shown in FIG. 7, the second roller portion 263 may include a second gear 263A that meshes with the first gear 262A. The second gear 263A has the same shape as the first gear 262A, and is connected to the second shaft portion 263B so as to rotate coaxially and integrally. Further, when the second gear 263A meshes with the first gear 262A, the second roller portion 263 rotates in the opposite direction with respect to the first roller portion 262. Accordingly, since the rotational force in the same direction as the rotational force applied to the cutting blade 7 from the first roller 262C is transmitted from the second roller 263C to the cutting blade 7, the transmission efficiency from the motor 5 to the cutting blade 7 is improved. Can be increased.

  Since the second gear 263A is held by the second roller holding portion 45 and can swing with respect to the housing 4A, the first gear 262A and the second gear 263A may be disengaged. However, by urging the second roller holding portion 45 with the spring 45B and optimizing the backlash between the first gear 262A and the second gear 263A, the first gear 262A and the second gear 263A are suitable. Can be engaged.

  As shown in FIG. 8, a first roller holding portion 346 that holds the first roller portion 362 may be provided in the same manner as the second roller holding portion 345. The first roller holding portion 346 is swingably supported by a first swing shaft portion 346A located above the first roller portion 362 and extending in parallel with the second swing shaft portion 345A. Further, since the spring 345B biasing the second roller holding portion 345 is received at the position above the first swing shaft portion 346A of the first roller holding portion 346, the first roller holding portion 346 is moved by the spring 345B. The housing 4A is urged to rotate clockwise as viewed from the front.

  The cutting blade 7 is held between the first roller 362C and the second roller 363C by the urging force applied to the first roller holding portion 346 and the urging force applied to the second roller holding portion 345. In this state, the first roller 362C and the second roller 363C urge the cutting blade 7 respectively. Further, since the first roller 262C and the second roller 263C can individually move with respect to the cutting blade 7, the contact state between the first roller 262C and the cutting blade 7, and the second roller 263C and the cutting blade 7 The state of contact with can be individually controlled. Therefore, even if the first roller 362C and the second roller 363C are worn by friction, the contact state between the first roller 362C and the second roller 363C and the cutting blade 7 can always be kept stable.

  In the present embodiment, the first roller holding portion and the second roller holding portion are configured to swing by the swing shaft portion. However, the present invention is not limited to this, for example, sliding in a direction parallel to the axial direction of the cutting blade, etc. You may take the structure which moves by. In this case, since the shaft portions of the first roller and the second roller are arranged in parallel to the radial direction of the cutting blade, when the first roller and the second roller are worn, the axial direction of the cutting blade, that is, the first roller and The first roller and the second roller move in a direction in which the second roller sandwiches the cutting blade. In such a configuration in which the first roller and the second roller move, the axial direction of the first roller and the second roller is always parallel to the radial direction of the cutting blade, so that the rotation of the motor is always transmitted efficiently. be able to.

  The cutting tool of the present invention is not limited to the tabletop cutting machine mentioned in the present embodiment, but can be applied to a cutting tool that requires a rotating cutting blade, such as a portable circular saw.

The side view of the tabletop cutting machine concerning embodiment of this invention. The front view of the tabletop cutting machine concerning embodiment of this invention. Sectional drawing along the III-III line of FIG. 1 (tilting state). The front view in the state where the desktop cutting machine concerning an embodiment of the invention tilted. The front sectional view in the state where the 2nd roller support part rocked in the cutting part of the tabletop cutting machine concerning an embodiment of the invention. Front sectional drawing which is a 1st modification of the tabletop cutting machine concerning embodiment of this invention, and concerns on a cutting part. It is a 2nd modification of the tabletop cutting machine concerning embodiment of this invention, and is an upper front fragmentary sectional view of a cutting part. It is a 3rd modification of the tabletop cutting machine concerning embodiment of this invention, and is an upper front fragmentary sectional view of a cutting part.

Explanation of symbols

1. ・ Desktop cutting machine 2. ・ Base part 3. ・ Supporting part 4. ・ Cutting part 4A ・ ・ Housing 4a ・ ・ Passage 5 ・ ・ Motor 5A ・ ・ Motor housing 5a ・ ・ Air hole 6 ・ ・ Transmission mechanism 6A ・· Pinion gear 7 · · Cutting blade 21 · · Base 21A · · Left base 21B · · Right base 22 · · Turntable 22A · · Turntable body 22B · · Upper surface 23 · · Fence 23A · · Left fence 23B · · Right Fence 24 ·· Projection portion 27 · · Cutting portion support portion 27A · · Tilt shaft 27B · · Tilt support portion 27b · · Long hole 28 · · Restriction operation portion 31 · · Tilt portion 31A · · Clamp 33 · · Slide support portion 33A ·· Slide pipe 33B ·· Knob 34 ·· Slide portion 35 ·· Oscillating shaft portion 35A ·· Oscillating shaft portion 35B ·· Spring 41 ·· Accommodating portion 41a ·· Space 42 ·· Rotating shaft 43A ··· First bearing 43B · · Second bearing 44A · · Saw blade shaft 44B · · Bolt 44C · · Flange 44D · · Wheel washer 44a · · Screw hole 45 · · Second roller holder 45A ·・ Second oscillating shaft 45B ・ ・ Spring 51 ・ ・ Rotor 51A ・ ・ Output shaft 52 ・ ・ Fan 61 ・ ・ Flat gear 62 ・ ・ First roller 62A ・ ・ First gear 62B ・ ・ First shaft 62C ··· First roller 63 ··· Second roller portion 63B · · Second shaft portion 63C ··· Second roller

Claims (10)

A drive unit for driving a cutting blade for cutting the processing member;
A cutting portion that rotatably supports the cutting blade;
The cutting unit includes a transmission mechanism that transmits power of the driving unit to the cutting blade,
The transmission mechanism includes a first roller and a second roller that sandwich the cutting blade between one side surface and the other side surface of the cutting blade;
At least the first roller is connected to the drive unit and driven to rotate ,
The first roller and the second roller are arranged such that their respective rotation axes are substantially parallel to the radial direction of the cutting blade,
Between the cutting blade and the cutting portion, there is a rotating shaft portion that rotatably supports the cutting blade with respect to the cutting portion,
The rotary shaft portion is detachably attached to the first shaft supported by the first bearing on the one side surface with respect to the cutting blade and the first shaft supported by the second bearing on the other side surface side. A cutting tool having two axes . The cutting tool according to claim 1 , wherein either one of the first roller and the second roller is configured to be separated from the side surface of the cutting blade. The cutting section includes an urging unit that urges at least one of the first roller and the second roller from the first surface side or the other surface side to the cutting blade. The cutting tool according to claim 1 or 2 . The cutting tool according to any one of claims 1 to 3 , wherein the first roller and the second roller are configured to be able to approach and separate from the cutting blade, respectively. The cutting tool according to any one of claims 1 to 4 , wherein the first roller and the second roller are connected to the driving unit and are driven to rotate in opposite directions to each other. 2. The drive unit is provided with a fan for cooling the drive unit, and fan air generated from the fan is exhausted toward the first roller and the second roller. The cutting tool according to any one of 5 . The drive unit has an output shaft portion, and is arranged so that the axial direction of the output shaft portion and the axial directions of the rotation shafts of the first roller and the second roller are substantially parallel to each other. The cutting tool according to any one of claims 1 to 6 , wherein the cutting tool is characterized. A base portion for supporting the processed member;
A support portion interposed between the base portion and the cutting portion and capable of tilting the cutting portion with respect to the base portion in a direction perpendicular to a side surface of the cutting blade; The cutting tool according to claim 1. The support portion includes a first support portion connected to the base portion, and a second support portion that supports the cutting portion,
9. The cutting tool according to claim 8 , wherein the second support portion is connected to the first support portion so as to be movable in a direction parallel to the upper surface of the base portion and the side surface of the cutting blade. .   A drive unit for driving a cutting blade for cutting the processing member;
  A cutting portion that rotatably supports the cutting blade;
  The cutting unit includes a transmission mechanism that transmits power of the driving unit to the cutting blade,
  The transmission mechanism includes a first roller and a second roller that sandwich the cutting blade between one side surface and the other side surface of the cutting blade;
  At least the first roller is connected to the drive unit and driven to rotate,
  The fan according to claim 1, wherein the driving unit is provided with a fan that cools the driving unit, and fan air generated from the fan is exhausted toward the first roller and the second roller. Cutting tool.

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