WO2019130980A1 - Machine de coupe - Google Patents

Machine de coupe Download PDF

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Publication number
WO2019130980A1
WO2019130980A1 PCT/JP2018/044198 JP2018044198W WO2019130980A1 WO 2019130980 A1 WO2019130980 A1 WO 2019130980A1 JP 2018044198 W JP2018044198 W JP 2018044198W WO 2019130980 A1 WO2019130980 A1 WO 2019130980A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
pulley
rotating member
housing
tooth
Prior art date
Application number
PCT/JP2018/044198
Other languages
English (en)
Japanese (ja)
Inventor
祐一 豊嶋
智知 岩田
健 熊倉
Original Assignee
工機ホールディングス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 工機ホールディングス株式会社 filed Critical 工機ホールディングス株式会社
Publication of WO2019130980A1 publication Critical patent/WO2019130980A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/04—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
    • B23D47/12—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of drives for circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/16—Saw benches
    • B27B5/18—Saw benches with feedable circular saw blade, e.g. arranged on a carriage
    • B27B5/20—Saw benches with feedable circular saw blade, e.g. arranged on a carriage the saw blade being adjustable according to depth or angle of cut; Radial saws, i.e. sawing machines with a pivoted radial arm for guiding the movable carriage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories

Definitions

  • the present invention relates to cutting machines.
  • a tabletop cutting machine has been widely used as an example of a cutting machine for cutting wood, pipes and the like (materials to be cut).
  • the first pulley attached to the motor shaft, the second pulley attached to the intermediate rotating shaft, and the first pulley and the second pulley are stretched.
  • the rotation of the motor shaft is transmitted to the intermediate rotation shaft by the first stage transmission mechanism comprising the first belt.
  • a second stage transmission consisting of a third pulley attached to the intermediate rotating shaft, a fourth pulley attached to the saw blade shaft, and a second belt stretched between the third pulley and the fourth pulley
  • the mechanism transmits the rotation of the intermediate rotating shaft to the saw blade shaft, and the saw blade mounted on the saw blade shaft rotates.
  • a timing belt may be used for the second belt in order to improve the transmission performance, but the belt and the pulley do not mesh well at the time of manufacturing or driving, and the rotation transmission is stably performed. There was a possibility that it could not be done.
  • an object of this invention is to provide the cutting machine which can perform stable rotation transmission.
  • the present invention comprises a housing, a motor having a rotating shaft supported and rotationally driven by the housing, an output shaft supported by the housing and mountable with a cutting blade, and supported by the housing. And a transmission mechanism portion capable of transmitting the rotational force of the rotation shaft to the output shaft, wherein the transmission mechanism portion includes a first rotation member having a tooth portion protruding in a radial direction, and a tooth portion protruding in a radial direction And an endless first belt stretched between the first rotating member and the second rotating member and having an engaging portion engaged with the tooth portion, the tooth Of the rotating shaft can be transmitted to the output shaft by engagement of the part and the engaging part, and the housing is at least one of the first rotating member and the second rotating member. With radially outwardly located walls, In the radial direction of at least one of the rotating members, the distance between the tip circle of the tooth and the inner surface of the wall is smaller than the width of the locus when the first belt is driven. And provides cutting machines.
  • the distance between the tooth portion of the rotating member and the inner surface of the wall portion is configured to be smaller than the width of the locus when the first belt is driven.
  • the distance between the teeth of the rotating member and the inner surface of the wall is the distance between the outer peripheral surface of the first belt and the tip surface of the engaging portion of the first belt. Is also small. According to this, in the rotation direction of the rotation member, the teeth of the first belt are prevented from jumping with respect to the rotation member, and a reduction in the transmission efficiency of rotation is suppressed. Further, damage to the belt can be suppressed, and the durability of the tool can be improved.
  • the housing is a side wall portion parallel to the side surface of the tooth portion of the at least one rotating member and the side surface of the engaging portion of the first belt in the axial direction of the at least one rotating member. It is preferable to further have
  • the side wall portion restricts the movement of the first belt in the axial direction even when a force in the axial direction of the rotating member acts on the first belt, so that the transmission efficiency of rotation is lowered. Is suppressed. Further, damage to the belt can be suppressed, and the durability of the tool can be improved.
  • the said housing has a motor housing which accommodates the said motor, and the gear housing which has the said wall part and the said side wall part.
  • the wall portion may be a position on an extension of an imaginary straight line connecting the axis of the first rotating member and the axis of the second rotating member, the at least one of the rotating member and the first belt. Are preferably provided at a position where the meshing starts to be engaged and the opposite position.
  • the wall portion be provided so as to face the entire meshing portion of the one of the rotating members and the first belt.
  • the wall portion is provided on the entire meshing portion of the rotating member and the first belt, it is possible to preferably suppress the tooth jumping.
  • the transmission mechanism unit is disposed between the rotary shaft and the output shaft on the transmission path of the rotational force, and is provided on an intermediate shaft that rotates in accordance with the rotation of the rotary shaft, and is provided on the rotary shaft.
  • an endless second belt stretched between fourth rotating members wherein the first rotating member is provided on the intermediate shaft and has a diameter smaller than that of the fourth rotating member.
  • the second rotating member is provided on the output shaft and has a diameter larger than that of the first rotating member.
  • the second belt is a V-belt
  • the third and fourth rotating members are V-pulleys.
  • the V-belt slides on the outer periphery of the V-pulley even when a high load other than specified occurs in the cutting blade, thereby suppressing breakage of each component that transmits rotation. This improves the durability of the tool.
  • the first belt is a timing belt
  • the first rotating member and the second rotating member are timing pulleys.
  • a tension adjustment mechanism capable of adjusting the tension of the first belt.
  • the belt tension adjusting mechanism capable of adjusting the tension of the first belt since the belt tension adjusting mechanism capable of adjusting the tension of the first belt is provided, power transmission can be suitably performed by adjusting the tension of the belt.
  • the tension adjustment mechanism has a belt pressing portion that presses the outer periphery of the first belt by moving in a direction orthogonal to the stretching surface of the first belt, and adjusts the moving amount of the belt pressing portion. It is preferable that the tension be adjustable.
  • a base having a mounting surface on which the workpiece can be placed, a cutting portion rotatably supporting the cutting blade, and a rocking portion orthogonal to the side surface of the cutting blade with respect to the base. It is preferable to further have a swinging portion that swingably supports the cutting portion at a position close to the base and a position away from the base with a dynamic axial center as a center.
  • the cutting portion has a swinging portion that swingably supports the cutting portion at a position close to the base and a position away from the base, with a swinging axial center orthogonal to the side surface of the cutting blade.
  • the teeth of the first belt are prevented from skipping with respect to the rotating member, and the reduction in the transmission efficiency of rotation is suppressed. Further, damage to the belt can be suppressed, and the durability of the tool can be improved.
  • the present invention further includes a housing, a motor having a rotating shaft supported and rotationally driven by the housing, an output shaft supported by the housing and mountable with a cutting blade, supported by the housing and a rotational force of the rotating shaft.
  • a transmission mechanism portion transmittable to the output shaft wherein the transmission mechanism portion includes a first rotation member having a radially projecting tooth portion and a second rotation member having a radially projecting tooth portion And an endless first belt stretched between the first rotating member and the second rotating member and having an engaging portion engaged with the tooth portion, the tooth portion and the engaging portion Are configured to be able to transmit the rotational force of the rotating shaft to the output shaft, and the housing is positioned radially outward of at least one of the first rotating member and the second rotating member.
  • the housing has Note that in the axial direction of at least one of the rotating members, it further has a side wall portion parallel to the side surface of the tooth portion of the at least one rotating member and the side surface of the engaging portion of the first belt. Provides a cutting machine.
  • the side wall portion restricts the movement of the first belt in the axial direction even when the force in the axial direction of the rotating member acts on the first belt, so that the transmission efficiency of the rotation decreases. Be suppressed. Further, damage to the belt can be suppressed, and the durability of the tool can be improved.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a right view which shows the external appearance of the bench-top circular saw concerning 1st Embodiment of this invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a left view which shows the external appearance of the bench-top circular saw concerning 1st Embodiment of this invention.
  • BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the external appearance of the bench-top circular saw concerning 1st Embodiment of this invention.
  • It is the IV-IV sectional view taken on the line of FIG. It is the elements on larger scale of FIG. (A) is a cross-sectional view taken along the line VI-VI in FIG.
  • (b) is a partially enlarged view of a meshing portion between the teeth of the second belt and the teeth of the fourth pulley. It is a figure which shows the assembly process of the gear housing of the bench-top circular saw concerning 1st Embodiment of this invention, and the aspect which makes the tooth part of a 2nd belt, and the tooth part of a 4th pulley engage in (a). Is shown, and (b) shows that the assembly is completed. It is a figure which shows the effect at the time of the drive of the tabletop circular saw concerning embodiment of this invention, The state at the time of non-driving is shown by (a), The state at the time of driving is shown by (b) .
  • a bench-top circular saw 1 which is an example of the electric power tool according to the embodiment of the present invention will be described with reference to FIGS.
  • the table-top circular saw 1 is an electric power tool for cutting wood, aluminum sash, etc. (material to be cut), and as shown in FIGS. 1 to 3, the base portion 2, the holder 3, It has the guide part 4, the moving part 5, and the cutting part 6 which supports the cutting blade P rotatably.
  • the "upper” shown in FIG. 1 is defined as the upper direction, the “lower” as the lower direction, the “front” as the front direction, and the “rear” as the rear direction. Further, in FIG. 1, the direction from the paper to the front is defined as the right direction, and the direction from the paper to the rear is defined as the left direction.
  • dimensions, numerical values, etc. are referred to in the present specification, not only dimensions and numerical values that completely coincide with the relevant dimensions, dimensions, etc., but also substantially identical dimensions, numerical values, etc. Shall be included.
  • the base 2 includes a base 21, a turntable 22 and a fence 23.
  • the base 21 is made of metal and is a portion that can be placed on a floor surface or the like.
  • the turntable 22 is made of metal and is connected to the base 21 via a pivot shaft (not shown) orthogonal to the upper surface, and the upper surface is disposed so as to be substantially flush with the upper surface of the base 21.
  • the upper surface of the base 21 and the upper surface of the turntable 22 define a mounting surface 2A on which a workpiece (a workpiece) can be mounted.
  • the base 21 and the turntable 22 are formed with grooves (not shown) that allow the cutting blade P to enter when the cutting portion 6 is lowered at the time of the cutting operation.
  • the base 21 is an example of the “base” in the present invention
  • the mounting surface 2A is an example of the “mounting surface” in the present invention.
  • the fence 23 is provided on the base 21 and has a right fence 23A and a left fence 23B as shown in FIG.
  • the right fence 23A and the left fence 23B have a pressing surface 23a substantially orthogonal to the mounting surface 2A.
  • an operation unit 24 is provided at the front of the turntable 22.
  • the operation unit 24 is a portion operated by the user when the turning operation of the turntable 22 and the turning position fixing operation are performed.
  • a tilting shaft 25 and a protrusion 26 are provided at the rear of the turntable 22.
  • the tilting shaft 25 extends in the front-rear direction in parallel with the side surface of the cutting blade P, and its central axis coincides with the upper surface of the turntable 22.
  • the projecting portion 26 projects upward from the rear portion of the base 21 and has a circular long hole 26 a formed around the central axis of the tilting shaft 25.
  • the holder 3 is provided between the base 21 and the cutting portion 6.
  • the holder 3 stands upward at the rear of the turntable 22 and the lower part thereof is supported so as to be tiltable about the tilt shaft 25.
  • the holder 3 can tilt in the left-right direction with respect to the turntable 22.
  • a screwing hole (not shown) is formed in the holder 3 at a position corresponding to the long hole 26a, and the clamp lever 31 is screwed into this screwing hole.
  • the guide portion 4 is fixed to the holder 3 and includes a first rod 41, a second rod 42 and a connecting member 43.
  • the first rod 41 and the second rod 42 are formed of a highly rigid material such as a pipe material.
  • the first rod 41 extends in a direction (longitudinal direction) parallel to the mounting surface 2A of the base portion 2 and orthogonal to the rotation axis of the cutting blade P.
  • the second rod 42 extends parallel to the first rod 41 and is located below the first rod 41.
  • the first rod 41 and the second rod 42 have the same length and are shorter than the longitudinal direction (front-rear direction) of the turntable 22.
  • the first rod 41 and the second rod 42 tilt with the holder 3 in the left-right direction by tilting the holder 3 with respect to the turntable 22 in the left-right direction.
  • the moving unit 5 rotatably supports the cutting unit 6 in the directions of the base unit 2 and the opposite base unit 2 and is slidably supported in the front-rear direction with respect to the guide unit 4.
  • the moving part 5 has a slide part 51 and a cutting part support part 52, as shown in FIG.
  • the slide portion 51 is provided so as to straddle the first rod 41 and the second rod 42.
  • the first rod 41 and the second rod 42 are inserted into the slide portion 51, whereby the slide portion 51 slides on the first rod 41 and the second rod 42 between the holder 3 and the connecting member 43.
  • the cutting portion support portion 52 is supported by the slide portion 51.
  • the cutting portion support portion 52 has a pivot axis extending in a direction (left-right direction) orthogonal to the axial direction (front-rear direction) of the first rod 41 and the second rod 42. 52A is fixed.
  • the cutting portion support portion 52 supports the cutting portion 6 so as to be pivotable in the directions of the base portion 2 and the non-base portion 2 about the pivot shaft 52A.
  • the cutting portion support portion 52 moves the cutting portion 6 close to the base 21 with respect to the base 21 with respect to the rotational axis 52A orthogonal to the side surface of the cutting blade P and moves the cutting portion 6 close to the base 21 It is pivotally supported at the following position.
  • the cutting portion support portion 52 is an example of the “rocking portion” in the present invention
  • the pivot shaft 52A is an example of the “rocking axis” in the present invention.
  • the cutting unit 6 is configured to include a motor 67 and a transmission mechanism unit 60, and a part of the cutting unit 6 is covered by a housing 6A.
  • the housing 6A is an example of the "housing" in the present invention.
  • the housing 6A of the cutting unit 6 includes a saw cover 61, a protective cover 62, a motor housing 63, a gear case 64, and a gear cover 65.
  • the saw cover 61 covers a part of the outer periphery of the cutting blade P.
  • the protective cover 62 can be accommodated in the saw cover 61, and is rotatably provided on the saw cover 61 so as to cover the outer periphery of the cutting blade P in a portion projecting from the saw cover 61.
  • the protective cover 62 is pivoted to a position covering the outer periphery of the cutting blade P in a portion protruding from the saw cover 61 in a state where the cutting portion 6 is pivoted upward as shown in FIG.
  • the portion 6 is pivoted downward (not shown), it is accommodated in the saw cover 61 by a link mechanism (not shown) and pivots to a position where the outer periphery of the cutting blade P in a portion projecting from the saw cover 61 is exposed.
  • the motor housing 63 has a substantially cylindrical shape extending in the left-right direction, and a slit-shaped intake port 63a is formed on the right side surface thereof, as shown in FIG.
  • the motor housing 63 is integrally provided with a handle portion 66.
  • the handle portion 66 is substantially U-shaped in a side view.
  • the handle portion 66 is provided with a switch 66A for controlling the drive of the motor 67 accommodated in the motor housing 63.
  • the motor housing 63 is an example of the "motor housing" in the present invention.
  • the gear case 64 is connected to the left opening of the motor housing 63 and has a wall extending in a direction parallel to the cutting blade P.
  • the bearing support portion 68 is detachably fixed to the gear case 64 by a fixing tool such as a bolt.
  • the gear cover 65 is connected to the lower right opening of the gear case 64 and has a wall extending parallel to the cutting blade P.
  • the gear case 64 and the gear cover 65 are examples of the "gear housing" in the present invention.
  • the motor 67 is accommodated inside the motor housing 63, and includes a motor main body 67A, a motor shaft 67B that rotationally drives, a fan 67C, and a commutator 67D.
  • the motor shaft 67B has a substantially cylindrical shape and is disposed to extend in the left-right direction of the motor main body 67A.
  • the motor shaft 67B is rotatably supported by the motor housing 63 via a bearing 67a.
  • the left end portion of the motor shaft 67B protrudes to the outside (left side) of the gear case 64.
  • the left end of the motor shaft 67B is rotatably supported by the gear case 64 via a bearing 67b.
  • the motor 67 is an example of the "motor” in the present invention, and the motor shaft 67B is an example of the "rotating shaft” in the present invention.
  • the fan 67C is fixed to the motor shaft 67B on the left side of the motor main body 67A.
  • the fan 67C rotates integrally with the motor shaft 67B, sucks the outside air from the air inlet 63a of the motor housing 63, and exhausts the air from the air outlet (not shown) formed in the gear case 64. Cool the 67D and so on.
  • the transmission mechanism portion 60 is a portion for transmitting the rotation of the motor 67 to the cutting blade P in a two-stage belt system, and as shown in FIG. 4, the first pulley 601, the intermediate shaft 602, the second pulley 603, A first belt 604, a third pulley 605, a spindle 606, a fourth pulley 607 and a second belt 608 are provided.
  • the first pulley 601, the second pulley 603, and the first belt 604 constitute a transmission mechanism of the first stage
  • the second stage transmission mechanism (the third pulley 605, the fourth pulley 607, and the second belt 608) is accommodated in the space defined by the left side surface of the gear case 64 and the inner surface of the gear cover 65.
  • the transmission mechanism unit 60 is an example of the “transmission mechanism unit” in the present invention.
  • the first pulley 601 is a V-pulley, and a groove extending in the circumferential direction is formed on the outer peripheral surface.
  • the first pulley 601 is fixed to the left end of the motor shaft 67B on the outer side (left side) of the gear case 64, and can rotate integrally with the motor shaft 67B.
  • the first pulley 601 is an example of the “third rotating member” in the present invention.
  • the intermediate shaft 602 is located between the motor shaft 67B and the spindle 606 on the transmission path of the rotational force of the motor shaft 67B.
  • the intermediate shaft 602 is located between the motor shaft 67B and the spindle 606 on the transmission path of rotational force, and is driven to rotate as the motor shaft 67B rotates.
  • the intermediate shaft 602 has a substantially cylindrical shape, and is disposed so as to extend in the left-right direction parallel to the motor shaft 67B.
  • the intermediate shaft 602 is rotatably supported by the gear case 64 via the bearing 70 a and the bearing 70 b. That is, the intermediate shaft 602 is rotatably supported by two bearings.
  • the bearing 70 a is supported by the gear case 64 via a bearing support 68.
  • the intermediate shaft 602 is an example of the “intermediate shaft” in the present invention.
  • the second pulley 603 is a V-pulley and has a substantially cylindrical shape extending in the left-right direction, and a groove extending in the circumferential direction is formed on the outer peripheral surface.
  • the outer diameter of the second pulley 603 is larger than the outer diameter of the first pulley 601. In other words, the second pulley 603 is formed larger in diameter than the first pulley 601.
  • the left end portion of the intermediate shaft 602 is fixed to the second pulley 603, and can be integrally rotated with the intermediate shaft 602.
  • the second pulley 603 is an example of the “fourth rotating member” in the present invention.
  • the first belt 604 is an endless belt made of a resin and is a V-belt in which a groove extending in the longitudinal direction is formed on the inner peripheral surface. An upper portion of the first belt 604 is stretched around the outer periphery of the first pulley 601, and a tension is applied at an extension rate larger than 1 and the lower portion is stretched over the outer periphery of the second pulley 603. It is stretched between the one pulley 601 and the second pulley 603. The first belt 604 rotates with the first pulley 601 and the second pulley 603 by the frictional force generated between the inner circumferential surface thereof and the outer circumferential surfaces of the first pulley 601 and the second pulley 603.
  • the first belt 604 is an example of the “second belt” in the present invention.
  • the third pulley 605 is a timing pulley and has a substantially cylindrical shape extending in the left-right direction, and a gear-shaped unevenness is formed on the outer peripheral surface.
  • the outer diameter of the third pulley 605 is smaller than the outer diameter of the second pulley 603. In other words, the third pulley 605 is smaller in diameter than the second pulley 603.
  • the third pulley 605 is fixed to the right of the central portion of the intermediate shaft 602 by press-fitting, and can rotate integrally with the intermediate shaft 602.
  • the third pulley 605 is an example of the “first rotating member” in the present invention.
  • the spindle 606 has a substantially cylindrical shape, and is disposed to extend in the left-right direction parallel to the motor shaft 67 B and the intermediate shaft 602.
  • the spindle 606 is rotatably supported on the gear case 64 via a bearing 71a, and rotatably supported on the gear cover 65 via a bearing 71b.
  • a mounting portion 606A having a fastener such as a bolt for mounting the cutting blade P is provided at the right end of the spindle 606, a mounting portion 606A having a fastener such as a bolt for mounting the cutting blade P is provided.
  • the mounting portion 606A protrudes to the outside (right side) of the gear cover 65.
  • the spindle 606 is an example of the “output shaft” in the present invention.
  • the fourth pulley 607 is a timing pulley and has a substantially cylindrical shape extending in the left-right direction, and a gear-shaped unevenness is formed on the outer peripheral surface.
  • the outer diameter of the fourth pulley 607 is larger than the outer diameter of the third pulley 605. In other words, the fourth pulley 607 is formed larger in diameter than the third pulley.
  • the fourth pulley 607 is fixed on the left side of the central portion of the spindle 606 by press-fitting, and can rotate integrally with the spindle 606.
  • an insertion hole 607a is formed at a position eccentric to the rotational axis of the fourth pulley 607, extending in the axial direction (front-rear direction) of the spindle 606 and forming an opening on the rear surface of the fourth pulley 607 There is.
  • the fourth pulley 607 is an example of the “second rotating member” in the present invention.
  • the second belt 608 is an endless belt made of resin and formed in an endless shape, and is a timing belt in which a gear-shaped unevenness is formed on the inner peripheral surface.
  • the second belt 608 is stretched between the third pulley 605 and the fourth pulley 607 by the upper part of the second belt 608 being bridged around the outer periphery of the third pulley 605 and the lower part thereof being bridged around the outer periphery of the fourth pulley 607. Ru.
  • the second belt 608 is stretched between the third pulley 605 and the fourth pulley 607 in a tensioned state at an extension rate greater than one.
  • the unevenness of the inner circumferential surface of the second belt 608 and the unevenness of the outer circumferential surfaces of the third pulley 605 and the fourth pulley 607 are engaged, so that the rotation of the third pulley 605 is the second belt 608.
  • the torque is transmitted to the fourth pulley 607 and rotates. Since the third pulley 605 and the fourth pulley 607 are timing pulleys and the second belt 608 is a timing belt, even when a high load occurs on the cutting blade P, the belts and pulleys mesh without slippage, and the rotation is transmitted As a result, efficient and stable cutting operation can be performed. Further, by using the timing belt and the timing pulley, the decrease in the transmission efficiency of rotation is suppressed, and the breakage of the belt is suppressed, so that the durability of the tool is improved.
  • the transmission mechanism unit 60 further includes a rotation restricting unit 7.
  • the rotation restricting portion 7 is configured to be able to restrict the rotation of the spindle 606, and includes a pin 71 and a spring 72.
  • the pin 71 is formed in a substantially cylindrical shape extending in the axial direction (front-rear direction) of the spindle 606, and the right end portion thereof is inserted into the insertion hole 64 c of the gear case 64.
  • the spring 72 is a coil spring, and the shaft portion of the pin 71 is inserted through the coil portion.
  • the right end of the spring 72 is in contact with the side surface of the gear case 64, and the left end of the spring 72 is in contact with a ring-shaped member provided on the pin 71.
  • the spring 72 biases the pin 71 to the left with respect to the gear case 64.
  • the pin 71 is configured to be insertable into the insertion hole 607a.
  • the third pulley 605 has a plate 605A. Further, as shown in FIG. 6, the third pulley 605 has a cylindrical portion 605B and a tooth portion 605C.
  • the plate 605A is located at the left end of the third pulley 605 and has a substantially annular shape.
  • the cylindrical portion 605B is formed in a cylindrical shape extending in the left-right direction, and the intermediate shaft 602 is fixed to the inner peripheral surface thereof.
  • the tooth portion 605C protrudes outward in the radial direction of the cylindrical portion 605B from the outer peripheral surface of the cylindrical portion 605B.
  • the third pulley 605 has a tooth portion 605C that protrudes in the radial direction.
  • the tooth portion 605C has a plurality of teeth provided at a predetermined pitch in the circumferential direction of the cylindrical portion 605B.
  • a tooth tip surface 605D perpendicular to the radial direction of the cylindrical portion 605B is defined at the protruding end portions of the plurality of teeth of the tooth portion 605C.
  • the tooth portion 605C is an example of the "tooth portion" in the present invention.
  • the fourth pulley 607 has a plate 607A. Further, as shown in FIG. 6, the fourth pulley 607 has a cylindrical portion 607B and a tooth portion 605C.
  • the plate 607A is located at the left end of the fourth pulley 607 and has a substantially annular shape.
  • the cylindrical portion 607B is formed in a substantially cylindrical shape extending in the left-right direction, and the spindle 606 is fixed to the inner peripheral surface thereof.
  • the tooth portion 607C protrudes outward in the radial direction of the cylindrical portion 607B from the outer peripheral surface of the cylindrical portion 607B.
  • the fourth pulley 607 has a tooth portion 607C that protrudes in the radial direction.
  • the tooth portion 607C has a plurality of teeth provided at a predetermined pitch in the circumferential direction of the cylindrical portion 607B.
  • a tooth tip surface 607D perpendicular to the radial direction of the cylindrical portion 607B is defined at the projecting end portions of the plurality of teeth of the tooth portion 607C.
  • the tooth portion 607C is an example of the "tooth portion" in the present invention.
  • the second belt 608 has a band portion 608A made of resin and a tooth portion 608B made of resin.
  • the band portion 608A has a predetermined width in the left-right direction.
  • the band portion 608A has an outer peripheral surface 608C.
  • the tooth portion 608B protrudes radially inward of the band portion 608A from the inner peripheral surface of the band portion 608A.
  • the teeth 608B are provided at a predetermined pitch in the circumferential direction of the band 608A, and have a plurality of teeth extending in the width direction (left-right direction) of the band 608A.
  • a tooth tip surface 608D is defined by the projecting end of each of the plurality of teeth of the tooth portion 608B. Tooth part 608B is an example of the "engagement part" in the present invention.
  • the plurality of teeth of the tooth portion 608B of the second belt 608 and the plurality of teeth of the tooth portion 607C of the fourth pulley 607 are engaged with each other. Further, the plurality of teeth of the tooth portion 608B of the second belt 608 and the plurality of teeth of the tooth portion 605C of the third pulley 605 are engaged with each other (not shown).
  • the rotational force of the motor shaft 67B of the motor 67 can be transmitted to the spindle 606 by engaging the tooth portion 605C and the tooth portion 607C with the tooth portion 608B.
  • the plate 605A of the third pulley 605 is positioned on the left side of the third pulley 605 so as to face the engagement portion.
  • the fourth pulley 607 is located on the right side of the meshing portion between the tooth portion 608B of the second belt 608 and the tooth portion 607C of the fourth pulley 607 shown in (ii) in the figure so as to face the meshing portion.
  • the plate 607A is configured to be positioned.
  • the gear case 64 has a first wall 64A, a second wall 64B, and a third wall 64C.
  • the first wall portion 64A is located radially outward of the third pulley 605 and extends in the left-right direction.
  • the first wall portion 64A has a tooth skipping control surface 64D.
  • the first wall 64A is an example of the "wall" in the present invention.
  • the tooth jump control surface 64D has a substantially arc shape and faces the outer peripheral surface 608C of the second belt 608.
  • the distance between the outer circumferential surface 608C of the second belt 608 and the tooth tip surface 608D is the distance between the outer circumferential surface 608C of the second belt 608 and the distance between the outer circumferential surface 608C of the second belt 608 and the distance between the outer circumferential surface 608C of the second belt 608 It is configured to be smaller than the distance between them.
  • the distance between the tip circle of the tooth portion 605C and the jump control surface 64D is configured to be smaller than the width of the locus at the time of driving the second belt 608. .
  • the second wall 64B is located at the lower end of the gear case 64 and extends in the vertical direction.
  • the second wall 64B has a lateral deviation regulating surface 64E.
  • the second wall 64B is an example of the “side wall” in the present invention.
  • the lateral deviation regulating surface 64E extends in the vertical and longitudinal directions. As shown in FIG. 5, the lateral deviation regulating surface 64E is on the left side of the meshing portion between the tooth portion 608B of the second belt 608 and the tooth portion 607C of the fourth pulley 607 shown in (ii) in the figure. It is located and is opposed to the meshing portion. In other words, the lateral deviation regulating surface 64E extends in parallel with the side surface of the meshing portion so as to face the side surface of the tooth portion 607C of the fourth pulley 607 and the side surface of the tooth portion 608B of the second belt 608.
  • the second wall portion 64B restricts the movement of the second belt 608 to the left, The reduction of the transmission efficiency of rotation is suppressed. Further, breakage of the second belt 608 can be suppressed, and the durability of the bench circular saw 1 can be improved.
  • the distance between the portion 607C and the meshing portion (portion (ii) in FIG. 5) is set to be substantially the same as the thickness of the band portion 608A of the second belt 608.
  • the distance between the lateral deviation regulating surface 64E and the meshing portion is configured to be approximately the same as the thickness of the band portion 608A.
  • the distance can be configured to be longer or shorter than the distance in the present embodiment, as long as the leftward movement of the second belt 608 with respect to the fourth pulley 607 can be suitably restricted. More specifically, the distance between the lateral deviation regulating surface 64E and the meshing portion (portion (ii) in FIG. 5) may be about 1 to 2 mm.
  • the third wall 64C is located radially outward of the fourth pulley 607, and protrudes rightward from the lower end of the second wall 64B.
  • the third wall portion 64C has a tooth skipping control surface 64F.
  • the third wall 64C is an example of the "wall" in the present invention.
  • the tooth jump control surface 64F has a substantially arc shape and faces the outer peripheral surface 608C of the second belt 608.
  • the distance between the outer circumferential surface 608C of the second belt 608 and the tooth tip surface 608D is the distance between the outer circumferential surface 608C of the second belt 608 and the distance between the outer circumferential surface 608C of the second belt 608 and the tooth tip surface 607D of the tooth portion 607 of the fourth pulley 607. It is configured to be smaller than the distance between them.
  • the distance between the tip circle of the tooth portion 607C and the fly-off regulating surface 64F is configured to be smaller than the width of the trajectory at the time of driving the second belt 608. . More specifically, as shown in FIG. 6 (b), the distance L1 between the tooth top surface 607D and the jump control surface 64F is the distance between the tooth top surface 608D and the outer peripheral surface 608C. Less than L2.
  • a stepped portion 64a is formed in a portion of the gear case 64 located above the fourth pulley 607, and a stepped portion 64b is formed in a portion located below. There is.
  • Each of the step portion 64 a and the step portion 64 b is formed by cutting out the outer periphery of the right end portion of the gear case 64.
  • the gear cover 65 has a first wall 65 ⁇ / b> A and a second wall 65 ⁇ / b> B.
  • the first wall portion 65A extends in the vertical direction, and has a lateral deviation regulating surface 65C.
  • the first wall 65A is an example of the "side wall" in the present invention.
  • the lateral deviation regulating surface 65C extends in the vertical and longitudinal directions. As shown in FIG. 5, the lateral deviation regulating surface 65C is on the right side of the meshing portion between the tooth portion 608B of the second belt 608 and the tooth portion 605C of the third pulley 605 shown in (i) in the figure. It is located and is opposed to the meshing portion. In other words, the lateral deviation regulating surface 65C extends parallel to the side surface of the meshing portion so as to face the side surface of the tooth portion 605C of the third pulley 605 and the side surface of the tooth portion 608B of the second belt 608.
  • the first wall portion 65A restricts the movement of the second belt 608 to the right, so the rotation transmission efficiency The decrease in Further, breakage of the second belt 608 can be suppressed, and the durability of the bench circular saw 1 can be improved.
  • the distance between the portion 605C and the meshing portion (portion (i) in FIG. 5) is set to be approximately the same as the thickness of the band portion 608A of the second belt 608.
  • the distance between the lateral deviation regulating surface 65C and the meshing portion is configured to be approximately the same as the thickness of the band portion 608A.
  • the distance can be configured to be longer or shorter than the distance in the present embodiment, as long as the rightward movement of the second belt 608 with respect to the third pulley 605 can be suitably restricted.
  • the distance between the lateral deviation regulating surface 65C and the meshing portion (portion (i) in FIG. 5) may be 1 to 2 mm.
  • the second wall 65 B forms the lower end of the gear cover 65.
  • the second wall 65B is located radially outward of the fourth pulley 607 and extends in the left-right direction.
  • the second wall portion 65B has a tooth skipping control surface 65D.
  • the second wall 65B is an example of the "wall" in the present invention.
  • the tooth jump restriction surface 65D has a substantially arc shape and faces the outer peripheral surface 608C of the second belt 608.
  • the distance between the outer circumferential surface 608C of the second belt 608 and the tooth tip surface 608D is the distance between the outer circumferential surface 608C of the second belt 608 and the distance between the outer circumferential surface 608C of the second belt 608 and the tooth tip surface 607D of the tooth portion 607 of the fourth pulley 607. It is configured to be smaller than the distance between them. In other words, in the radial direction of the fourth pulley 607, the distance between the tip circle of the tooth portion 607C and the fly-off regulating surface 65D is configured to be smaller than the width of the trajectory at the time of driving the second belt 608. .
  • the jump control surface 64F of the third wall 64C of the gear case 64 and the jump control surface 65D of the second wall 65B of the gear cover 65. are configured to be flush.
  • the jump control surface 64F faces the left portion of the second belt 608, and the jump control surface 65D faces the right portion of the second belt 608.
  • the second belt 608 is prevented from jumping teeth.
  • a stepped portion 65a is formed in a portion of the gear cover 65 located above the fourth pulley 607, and a stepped portion 65b is formed in a portion located below the fourth pulley 607.
  • Each of the step portion 65 a and the step portion 65 b is formed by cutting out the inner periphery of the left end portion of the gear cover 65.
  • the step portion 65a is configured to be engageable with the step portion 64a
  • the step portion 65b is configured to be engageable with the step portion 64b.
  • the first wall 64A of the gear case 64 is a virtual connecting the rotation axis of the third pulley 605 and the rotation axis of the fourth pulley 607. It is provided at a position on a straight extension, and at a position opposite to the portion where the third pulley 605 and the second belt 608 start meshing at the time of driving. Further, the third wall portion 64C of the gear case and the second wall portion 65B of the gear cover 65 are provided at a position facing the portion where the fourth pulley 607 and the second belt 608 start meshing at the time of driving. As a result, it is possible to preferably suppress the tooth skipping of the second belt 608 with respect to the third pulley 605 and the fourth pulley 607.
  • the first wall portion 64A is provided to face the entire meshing portion of the third pulley 605 and the second belt 608. Further, the third wall 64C and the second wall 65B are provided to face the entire meshing portion of the fourth pulley 607 and the second belt 608. According to such a configuration, it is possible to preferably suppress the tooth skipping of the second belt 608 with respect to the third pulley 605 and the fourth pulley 607.
  • the wall portion for suppressing the tooth jump of the second belt 608 is provided on the radially outer side of any of the third pulley 605 and the fourth pulley 607.
  • a wall may be provided to be positioned radially outward of at least one of the fourth pulley 607.
  • the side wall portion for suppressing the lateral displacement of the second belt is provided on the radially outer side of any of the third pulley 605 and the fourth pulley 607.
  • a side wall may be provided to be positioned radially outward of at least one of the four pulleys 607.
  • the second belt 608 is stretched over the third pulley 605 fixed to the intermediate shaft 602 supported by the gear case 64.
  • the distance between the tooth jump regulating surface 64D and the tooth tip surface 605D of the tooth portion 605C of the third pulley 605 is the outer circumferential surface 608C of the second belt 608 and the tooth tip. Since the distance between the second belt 608 and the teeth 605C of the third pulley 605 is not engaged, the second belt 608 is stretched over the third pulley 605 because the distance between the second belt 608 and the face 608D is smaller than the distance between the second belt 608 and the surface 608D. It can not be passed. That is, since the second belt 608 can be bridged over the third pulley 605 only when the teeth 608 B of the second belt 608 and the teeth 605 C of the third pulley 605 are sufficiently meshed, It is possible to suppress flight appropriately.
  • the step portion 65a of the gear cover 65 is engaged with the step portion 64a of the gear case 64, and the step portion 65b of the gear cover 65 is engaged with the step portion 64b of the gear case 64.
  • the gear cover 65 is fixed to the gear case 64 using a fixing member (such as a screw) not shown.
  • the cutting portion 90 of the conventional tabletop circular saw shown in FIG. 11 has a gear case 91 and a gear cover 92.
  • the cutting unit 90 has a transmission mechanism unit formed of a two-stage reduction mechanism.
  • a transmission mechanism of the cutting unit 90 includes a spindle 95, a fourth pulley 94 fixed to the spindle 95 and integrally rotated with the spindle 95, and a second belt stretched around a third pulley and a fourth pulley 94 (not shown). And 93.
  • the structure corresponding to the second wall 64B in the present embodiment is not provided in the gear case 91 of the conventional tabletop circular saw.
  • the lateral deviation regulating surface 64E extending parallel to the side surface of the meshing portion is not provided so as to face the side surface of the tooth portion of the fourth pulley 94 and the side surface of the tooth portion of the second belt 93.
  • FIG. 12A when the teeth of the fourth pulley 94 are engaged with the teeth of the second belt 93, the teeth of the second belt 93 and the fourth belt 93 are engaged.
  • FIG. 12A when the teeth of the fourth pulley 94 are engaged with the teeth of the second belt 93, the teeth of the second belt 93 and the fourth belt 93 are engaged.
  • the second belt 93 is moved to the left with respect to the fourth pulley 94 by a frictional force generated between the second belt 93 and the tooth portion of the pulley 94, as shown in FIG.
  • the belt 93 is assembled with the fourth pulley 94 shifted to the left.
  • the second belt 93 may be broken by driving in this state.
  • the gear case 64 is provided with the second wall portion 64B, so that lateral displacement of the second belt 608 with respect to the fourth pulley 607 can be suitably suppressed.
  • the tooth portion 607C of the fourth pulley 607 is engaged with the tooth portion 608B of the second belt 608, the tooth portion 608B of the second belt 608 is engaged.
  • the second wall 64B is provided integrally with the gear case 64, there is no need to add a new part to suppress lateral displacement of the belt, and the second wall 64B is provided in advance at the time of assembly. It is possible to suppress the completion of the assembly in a state where the belt is laterally shifted.
  • the second belt 608 can not be bridged over the fourth pulley 607 in the absence state, and it becomes possible to preferably suppress the tooth jump.
  • the operator presses the left end of the pin 71 to the right against the biasing force of the spring 72.
  • the pin 71 moves to the right.
  • the operator rotates the cutting blade P while maintaining the pressed state of the pin 71, and searches for a position where the insertion hole 607a overlaps the pin 71 in the left-right direction.
  • the insertion hole 607a and the pin 71 overlap.
  • the pin 71 is inserted into the insertion hole 607a.
  • the motor 67 When the switch 66A of the handle portion 66 is pressed, the motor 67 is driven, and the motor shaft 67B starts to rotate integrally with the first pulley 601. Along with this rotation, the first belt 604 stretched around the first pulley 601 starts to rotate by the frictional force acting between the inner circumferential surface thereof and the first pulley 601. That is, the first belt 604 transmits the rotation of the motor shaft 67B and the first pulley 601 to the second pulley 603, and the second pulley 603 starts to rotate.
  • the third pulley 605 fixed to the intermediate shaft 602 rotates.
  • the second belt 608 meshing with the third pulley 605 is rotated by the third pulley 605
  • the fourth pulley 607 meshing with the second belt 608 is rotated by the second belt 608.
  • the fourth pulley 607 is formed larger in diameter than the third pulley 605
  • the rotation of the intermediate shaft 602 is decelerated and transmitted to the spindle 606. That is, the second stage transmission mechanism including the third pulley 605, the fourth pulley 607 and the second belt 608 decelerates the rotation of the intermediate shaft 602 and transmits it to the spindle 606.
  • the cutting blade P mounted on the mounting portion 606 A of the spindle 606 rotates with the spindle 606 at the same rotational speed.
  • the rotation of the motor shaft 67B is decelerated in two steps and transmitted to the cutting blade P.
  • the operator when cutting the material to be cut at a cutting angle not perpendicular to the mounting surface 21 A of the base 21, the operator operates the clamp lever 31 of the holder 3 to cut the base portion 2 of the holder 3. Release the fixed for. In this state, the worker moves the handle portion 66 in the left-right direction. With the movement of the handle portion 66 in the left-right direction, the holder 3 and the cutting portion 6 tilt around the axial center of the tilting shaft 25 of the base portion 2. The operator fixes the holder 3 to the base portion 2 at a desired tilt angle using the clamp lever 31, and swings the cutting portion 6 to perform the cutting operation.
  • the gear case 91 of the conventional table-top circular saw is not provided with a configuration corresponding to the third wall 64C in the present embodiment.
  • the gear cover 92 of the conventional tabletop circular saw is not provided with a configuration corresponding to the second wall 65B in the present embodiment. That is, in the radial direction of the fourth pulley 94, the distance between the inner surfaces of the gear case 91 and the gear cover 92 and the tooth top surface of the fourth pulley 94 is the outer peripheral surface of the second belt 93 and the tooth top surface of the second belt. It is configured to be larger than the distance between
  • the second belt 608 jumps the teeth with respect to the fourth pulley 607. It is possible to Specifically, even when a large load is applied to the spindle 606, as shown in FIG. 8B, the tooth jump control surface 64F of the third wall 64C and the tooth jump of the second wall 65B.
  • the engagement between the toothed portion 608B of the second belt 608 and the toothed portion 607C of the fourth pulley 607 is maintained by contacting the restricting surface 65D with the outer circumferential surface 608C of the second belt 608, and the fourth pulley 607 is maintained.
  • Tooth skipping of the second belt 608 is suppressed.
  • the third wall 64C and the second wall 65B are integrally formed on the gear case 64 and the gear cover 65, respectively, there is no need to add a new component to suppress tooth jump, and Since the third wall 64C and the second wall 65B are provided in advance at the time of assembly, insufficient meshing between the belt and the pulley can be suitably suppressed.
  • the first wall portion 64A of the gear case 64 includes the rotation axis of the third pulley 605 and the rotation axis of the fourth pulley 607.
  • the third pulley 605 and the second belt 608 are provided at a position on the extension of an imaginary straight line connecting the two and a position where the third pulley 605 and the second belt 608 start meshing with each other.
  • the third wall portion 64C of the gear case and the second wall portion 65B of the gear cover 65 are provided at a position facing the portion where the fourth pulley 607 and the second belt 608 start meshing at the time of driving.
  • the first wall portion 64A is provided to face the entire meshing portion of the third pulley 605 and the second belt 608. Further, the third wall 64C and the second wall 65B are provided to face the entire meshing portion of the fourth pulley 607 and the second belt 608. According to such a configuration, it is possible to preferably suppress the tooth skipping of the second belt 608 with respect to the third pulley 605 and the fourth pulley 607.
  • the desktop circular saw 100 which is an example of a cutting machine according to a second embodiment of the present invention, will be described.
  • the desktop circular saw 100 basically has the same configuration as the desktop circular saw 1 according to the first embodiment, and the description of the same configuration as the desktop circular saw 1 is omitted as appropriate, and a different configuration is provided. Mainly about.
  • a fourth pulley 610 is provided instead of the fourth pulley 607, and a gear case 164 is provided instead of the gear case 64, A gear cover 165 is provided instead of the gear cover 65.
  • the tabletop circular saw 100 according to the second embodiment has the same effect as the tabletop circular saw 1 according to the first embodiment.
  • the fourth pulley 610 has a plate 610A.
  • the plate 610A is located at the left end of the fourth pulley 610 and has a substantially annular shape.
  • the plate 610A of the fourth pulley 610 is configured to be positioned to face the engagement portion.
  • the gear case 164 has a fourth wall portion 164C.
  • the fourth wall portion 164C is a lower end portion of the gear case 164.
  • the fourth wall portion 164C is located radially outward of the fourth pulley 610 and extends in the left-right direction.
  • the fourth wall portion 164C has a jump control surface 164F.
  • the fourth wall portion 164C is an example of the "wall portion" in the present invention.
  • the tooth jump restriction surface 164F has a substantially arc shape and faces the outer peripheral surface 608C of the second belt 608.
  • the distance between the outer circumferential surface 608C of the second belt 608 and the tooth tip surface 608D is the distance between the outer circumferential surface 608C of the second belt 608 and the distance between the outer circumferential surface 608C of the second belt 608 and the distance between the outer circumferential surface 608D of the second belt 608 It is configured to be smaller than the distance between them.
  • the distance between the tip circle of the tooth portion 610C and the fly-off regulating surface 164F is configured to be smaller than the width of the locus at the time of driving the second belt 608. .
  • the tooth portion 608B of the second belt 608 is prevented from jumping off with respect to the tooth portion 610C of the fourth pulley 610, and a reduction in the transmission efficiency of rotation is suppressed. .
  • damage to the second belt 608 can be suppressed, and the durability of the desktop circular saw 100 can be improved.
  • the gear case 164 is formed with a tension adjustment mechanism support hole 164 c extending in a direction orthogonal to the outer peripheral surface of the second belt 608.
  • the tension adjustment mechanism support hole 164 c is provided with a base portion 164 G in which a screw hole extending in a direction perpendicular to the outer circumferential surface of the second belt 608 is formed.
  • the gear cover 165 has a third wall 165 ⁇ / b> B and a fourth wall 165 ⁇ / b> C.
  • the third wall portion 165B is located at the lower end portion of the gear cover 165 and extends in the vertical direction.
  • the third wall portion 165B has a lateral deviation regulating surface 165E.
  • the third wall portion 165B is an example of the “side wall portion” in the present invention.
  • the lateral deviation regulating surface 165E extends in the vertical and longitudinal directions.
  • the lateral deviation regulating surface 165E is located on the right side of the meshing portion between the tooth portion 608B of the second belt 608 and the tooth portion 610C of the fourth pulley 610 shown in (ii) in the figure, and is opposed to the meshing portion. There is.
  • the lateral deviation regulating surface 165E extends parallel to the side surface of the meshing portion so as to face the side surface of the tooth portion 610C of the fourth pulley 610 and the side surface of the tooth portion 608B of the second belt 608.
  • the third wall portion 165B restricts the movement of the second belt 608 to the right, so the rotation transmission efficiency The decrease in In addition, damage to the second belt 608 can be suppressed, and the durability of the desktop circular saw 100 can be improved.
  • the lateral deviation regulating surface 165E, the teeth 608B of the second belt 608, and the teeth of the fourth pulley 610 in order to appropriately restrict the movement of the second belt 608 to the right with respect to the fourth pulley 610, the lateral deviation regulating surface 165E, the teeth 608B of the second belt 608, and the teeth of the fourth pulley 610.
  • the distance between the portion 610C and the meshing portion (portion (ii) in FIG. 9) is set to be approximately the same as the thickness of the band portion 608A of the second belt 608.
  • the distance between the lateral deviation regulating surface 165E and the meshing portion is configured to be approximately the same as the thickness of the band portion 608A.
  • the distance can be configured to be longer or shorter than the distance in the present embodiment, as long as the rightward movement of the second belt 608 with respect to the fourth pulley 610 can be suitably restricted.
  • the distance between the lateral deviation regulating surface 165E and the meshing portion (portion (ii) in FIG. 9) may be 1 to 2 mm.
  • the fourth wall portion 165C is located radially outward of the fourth pulley 610, and protrudes rightward from the lower end portion of the third wall portion 165B.
  • the fourth wall portion 165C has a tooth skipping control surface 165F.
  • the fourth wall portion 165C is an example of the "wall portion" in the present invention.
  • the tooth jump restriction surface 165F has a substantially arc shape and faces the outer peripheral surface 608C of the second belt 608.
  • the distance between the tooth skip regulating surface 165F and the tooth top surface 610D of the tooth portion 610C of the fourth pulley 610 is the distance between the outer circumferential surface 608C of the second belt 608 and the tooth top surface 608D. It is configured to be smaller than the distance between them.
  • the distance between the tip circle of the tooth portion 610C and the jump restriction surface 165F is configured to be smaller than the width of the locus at the time of driving the second belt 608. .
  • the tooth portion 608B of the second belt 608 is prevented from jumping off with respect to the tooth portion 610C of the fourth pulley 610, and a reduction in the transmission efficiency of rotation is suppressed. .
  • damage to the second belt 608 can be suppressed, and the durability of the desktop circular saw 100 can be improved.
  • the jump control surface 164F of the fourth wall portion 164C of the gear case 164 and the jump control surface 165F of the fourth wall portion 165C of the gear cover 165. are configured to be flush.
  • the jump control surface 164F faces the left portion of the second belt 608, and the jump control surface 165F faces the right portion of the second belt 608. , And the second belt 608 is prevented from jumping teeth.
  • the desktop circular saw 100 has a tension adjusting mechanism 8 capable of adjusting the tension of the second belt 608.
  • the tension adjusting mechanism 8 includes a moving unit 81, an adjusting unit 82, and a pressing unit 83.
  • the moving portion 81 is formed in a substantially rectangular parallelepiped shape, and has a main body portion that can slide with respect to the tension adjustment mechanism support hole 164 c of the gear case 164.
  • the end of the moving unit 81 close to the second belt 608 supports the pressing unit 83.
  • the pressing portion 83 has a cylindrical shape extending in the left-right direction, and is configured to be able to adjust the tension by pressing the second belt 608. Further, the pressing portion 83 is rotatably supported around an axial center extending in the left-right direction in the moving portion 81.
  • the pressing portion 83 is an example of the “belt pressing portion” in the present invention.
  • the adjusting unit 82 is configured to be able to adjust the position of the moving unit 81 with respect to the base portion 164G of the gear case 164.
  • the adjusting portion 82 extends in a direction perpendicular to the outer circumferential surface 608 C of the second belt 608.
  • a screw thread (not shown) is formed on the outer periphery of the adjustment portion 82, and is screwed into a screw hole formed in the base portion 164G.
  • the worker rotates the adjusting unit 82 clockwise to move the moving unit 81, the adjusting unit 82, and the moving unit 81 in the direction orthogonal to the stretching surface of the second belt 608.
  • the pressing portion 83 moves in a direction approaching the outer peripheral surface 608 C of the second belt 608.
  • the pressing portion 83 can press the outer peripheral surface 608C of the second belt 608.
  • the moving unit 81, the adjusting unit 82, and the pressing unit 83 are the outer peripheral surface of the second belt 608 in the direction orthogonal to the stretching surface of the second belt 608. Move in the direction away from 608C. That is, in the present embodiment, the tension can be adjusted by adjusting the amount of movement of the pressing portion 83. Thereby, the engagement between the second belt 608 and the third pulley 605 and the fourth pulley 610 is promoted, and rotation can be suitably transmitted.
  • the tension adjustment mechanism 8 can be used to apply tension to the second belt 608 in a state in which the tooth jump between the belt 608 and the fourth pulley 610 is suitably suppressed.
  • the tension adjustment mechanism 8 of the second belt 608 may be provided as in the desktop circular saw 100 according to the second embodiment.
  • timing belt has been described as an example of the belt, but the present invention is also applicable to belts other than timing belts, such as metal chain belts.
  • a tabletop circular saw has been described as an example of a cutting machine, but the present invention is also applicable to a cutting machine using a belt as a mechanism for transmitting the rotation of a motor, for example It is applicable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Abstract

La présente invention concerne une machine de coupe conçue de façon à supprimer le saut de dent et à permettre la transmission stable de la rotation. Un mécanisme de transmission (60) comprend : une troisième poulie (605) ayant des dents faisant saillie radialement (605C) ; une quatrième poulie (607) ayant des dents faisant saillie radialement (607C) ; et une seconde courroie sans fin (608) montée entre la troisième poulie (605) et la quatrième poulie (607) et ayant des dents venant en prise avec les dents (605C) et les dents (607C). Le mécanisme de transmission (60) est conçu de sorte que la mise en prise entre les dents et une section de mise en prise permet la transmission de la force de rotation d'un arbre rotatif à un arbre de sortie. Un boîtier (60A) présente une paroi située radialement à l'extérieur de la troisième poulie (605) et de la quatrième poulie (607). Dans la direction radiale de la troisième poulie (605) et de la quatrième poulie (607), la distance entre la surface interne de la paroi et chacun des cercles de tête des dents (605) et des dents (607C) est inférieure à la largeur de la trajectoire de la seconde courroie (608) pendant son entraînement.
PCT/JP2018/044198 2017-12-28 2018-11-30 Machine de coupe WO2019130980A1 (fr)

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JPH10225925A (ja) * 1997-02-14 1998-08-25 Kioritz Corp 動力切断機及び該切断機用遠心クラッチ
WO2008026604A1 (fr) * 2006-08-31 2008-03-06 Daikin Industries, Ltd. Climatiseur
JP2010274391A (ja) * 2009-05-29 2010-12-09 Hitachi Koki Co Ltd 卓上切断機
US20110053719A1 (en) * 2005-07-16 2011-03-03 Schaeffler Technologies Gmbh & Co. Kg Belt drive
JP2012077868A (ja) * 2010-10-04 2012-04-19 Seiko Epson Corp ベルト駆動伝達装置
WO2017154522A1 (fr) * 2016-03-05 2017-09-14 日立工機株式会社 Machine de coupe de bureau

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Publication number Priority date Publication date Assignee Title
JPH07259937A (ja) * 1994-03-18 1995-10-13 Honda Motor Co Ltd 無端状動力伝達帯の歯飛び防止構造
JPH10225925A (ja) * 1997-02-14 1998-08-25 Kioritz Corp 動力切断機及び該切断機用遠心クラッチ
US20110053719A1 (en) * 2005-07-16 2011-03-03 Schaeffler Technologies Gmbh & Co. Kg Belt drive
WO2008026604A1 (fr) * 2006-08-31 2008-03-06 Daikin Industries, Ltd. Climatiseur
JP2010274391A (ja) * 2009-05-29 2010-12-09 Hitachi Koki Co Ltd 卓上切断機
JP2012077868A (ja) * 2010-10-04 2012-04-19 Seiko Epson Corp ベルト駆動伝達装置
WO2017154522A1 (fr) * 2016-03-05 2017-09-14 日立工機株式会社 Machine de coupe de bureau

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