WO2007010852A1 - 切断機 - Google Patents
切断機 Download PDFInfo
- Publication number
- WO2007010852A1 WO2007010852A1 PCT/JP2006/314057 JP2006314057W WO2007010852A1 WO 2007010852 A1 WO2007010852 A1 WO 2007010852A1 JP 2006314057 W JP2006314057 W JP 2006314057W WO 2007010852 A1 WO2007010852 A1 WO 2007010852A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- motor
- saw blade
- gear
- circular saw
- shaft
- Prior art date
Links
Classifications
-
- 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
- B27B9/00—Portable power-driven circular saws for manual operation
-
- 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
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
- B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/768—Rotatable disc tool pair or tool and carrier
- Y10T83/7684—With means to support work relative to tool[s]
- Y10T83/7693—Tool moved relative to work-support during cutting
Definitions
- the present invention relates to a cutting machine such as a portable circular saw that reduces reaction at the time of starting a motor.
- a motor and a circular saw blade are housed in a housing so that the motor shaft and the saw blade shaft are parallel to each other.
- a surface plate is connected to the housing.
- a starting gear is fixed to the motor shaft, a terminal gear is fixed to the saw blade shaft, and an intermediate gear is disposed between the two gears. The rotation of the motor is decelerated and transmitted to the circular saw blade by the meshing of these gears (see, for example, Patent Documents 1 and 2).
- a portable circular saw has a control device that controls the motor so that the number of rotations of the motor is constant regardless of a change in load.
- This control device includes a rotation speed detection sensor that projects into the cooling air flow path toward the outer peripheral edge of the cooling fan of the motor. As the rotation speed sensor does not inhibit the flow of cooling air, a fan casing of the cooling fan has a baffle portion formed on its inner side (for example, see Patent Document 3.) 0
- Patent Document 1 JP 2002-160121 A
- Patent Document 2 JP-A-9-141602
- Patent Document 3 Japanese Patent Application Laid-Open No. 2004-155097
- the baffle portion of the cooling fan in the portable circular saw described in Patent Document 3 is formed as a baffle plate that extends long in the fan casing. This structure complicates the shape of the fan casing and makes it difficult to process, and further reduces the air flow from the cooling fan.
- An object of the present invention is to provide a cutting machine that can eliminate the above-mentioned problems.
- a feature of the invention is a cutting machine including the following elements.
- the cutting machine includes a motor (6) having a motor shaft (6a).
- the cutting machine includes a circular saw blade (1) having a saw blade axis (la) parallel to the motor shaft (6a).
- the cutting machine includes a housing (2) that houses a motor (6) and a circular saw blade (1) and has a handle (14) at the rear.
- the cutting machine includes a surface plate (4) connected to the housing (2).
- the cutting machine includes a starting gear (7a) fixed to the motor shaft (6a).
- the cutting machine includes a terminal gear (7b) fixed to the saw blade axis (la).
- the cutting machine includes intermediate gears (7c, 7d) disposed between the starting gear (7a) and the terminal gear (7b).
- the start gear (7a), the end gear (7b), and the intermediate gears (7c, 7d) mesh with each other, and the rotation of the motor (6) is reduced and transmitted to the circular saw blade (1) as rotation in the same direction.
- the intermediate gears (7c, 7d) are positioned rearward with respect to a plane including the motor shaft (6a) and the saw blade shaft (la).
- the terminal gear (7b) may be positioned rearward of the motor shaft (6a).
- the motor (6) may have a soft start function!
- the arrangement of the intermediate gears (7c, 7d) can reduce the weight on the front side of the motor shaft (6a) and increase the weight on the rear side. Even if the saw and the circular saw blade (1) rotate in the same direction, the motor (6) and the circular saw blade (1) are rotated against the housing (2) and the surface plate (4) by the initial rotation. Reduce recoil. Therefore, the housing (2) and the surface plate (4) can easily hold the initial force of the motor (6) in a constant posture, and the operator can perform accurate machining without feeling uncomfortable, and the operability is improved. improves. [0012]
- the arrangement of the terminal gear (7b) further reduces reaction against the housing (2) and the surface plate (4) due to the motor (6) and the circular saw blade (1) rotating in the same direction. .
- the soft start function starts the motor (6) smoothly and further reduces the reaction.
- FIG. 1 is a partially cutaway plan view of a cutting machine according to an embodiment of the present invention, where F1 is front, R1 is rear, R2 is right, and L2 is left.
- FIG. 2 is a front view of the cutting machine shown in FIG.
- FIG. 3 is a front view showing the cutting machine shown in FIG. 2 with a part of a cover removed from the nosing.
- FIG. 4 is a longitudinal sectional view of the cutting machine shown in FIG.
- FIG. 5 is a graph illustrating the soft start function of the motor.
- FIG. 6 is a partially cutaway longitudinal sectional view showing a motor control device.
- FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG.
- FIG. 8 is a perspective view showing a fan casing of a motor cooling fan device together with a case of a control device.
- FIGS. 9A and 9B are a front view and a side view of the case of the control device, respectively.
- FIGS. 10A and 10B are a front view and a side view, respectively, of a modification of the case of the control device.
- a portable circular saw which is a type of this cutting machine, includes a circular saw blade 1 and a saw 2 that houses a drive unit thereof.
- the circular saw includes a surface plate 4 disposed below the housing 2 and rotatably connected to the front end of the housing 2 via a pivot 3.
- the circular saw includes a cutting depth adjusting device 5 that allows the surface plate 4 to pivot about the pivot 3 and adjusts the amount of protrusion of the circular saw blade 1 below the surface plate 4.
- the housing 2 includes a motor case 2a in which the motor 6 of the drive unit is accommodated.
- the housing 2 includes a gear box 2b that houses a power transmission gear train 7 of the drive unit.
- the housing 2 includes a cover 2c that covers substantially the upper half of the circular saw blade 1.
- motor The case 2a, the gear box 2b, and the cover 2c are integrally formed.
- the motor 6 has a soft start function. Although not shown, the current value flowing through the coil is detected by the detection unit when the motor 6 is started, and the resistance value of the coil is temporarily increased by the CPU by the detection signal from the detection unit. As a result, the inrush current T at the start of the motor 6 indicated by the broken line in FIG. 5 disappears, and a stable current U from the beginning is supplied to the coil as indicated by the solid line in FIG. Therefore, the motor 6 starts silently and stable cutting work can be performed from the beginning.
- the motor case 2a extends in the left-right direction of the portable circular saw, and the motor 6 is placed horizontally in the motor case 2a.
- the motor 6 is provided with a cooling fan device. That is, the cooling fan 8 is fixed to the motor shaft 6a, and the fan casing 9 covering the cooling fan 8 is inserted and fixed in the cavity of the motor case 2a.
- the gear box 2b is disposed at the left end of the motor case 2a in the figure, and is fixed to the motor case 2a with a screw or the like. Both ends of the motor shaft 6a are supported by bearings 10 and 11 on the right end of the gear box 2b and the right end of the motor case 2a, respectively. The left end of the motor shaft 6a has a starting gear 7a. This starting gear 7a is inserted into the gear box 2b. The bottom of the gear box 2b is positioned so as to be lower than the bottom of the motor case 2a. There, the saw blade axis la of the circular saw blade 1 is supported via a bearing 12 and a-dollar bearing 18.
- the saw blade shaft la has an end portion on the intermediate gear 7c side, and this end portion is supported by a dollar bearing 18. As a result, the distance between the motor shaft 6a and the saw blade shaft la is reduced, and the circular saw can be reduced in size and weight.
- the terminal gear 7b is fixed at a position where the saw blade axis la enters the gear box 2b.
- the gear box 2b accommodates intermediate gears 7c and 7d that connect between the start gear 7a and the end gear 7b.
- the intermediate gears 7c and 7d are fixed on the same axis. By omitting one of the intermediate gears 7c and 7d, the idle gear may not be involved in the speed ratio.
- the cover 2 c is curved along the outer periphery of the circular saw blade 1 and divided in the left-right direction of the portable circular saw.
- the right half of the cover 2c is formed integrally with the gear box 2b so as to be continuous with the gear box 2b, and the left half is fixed to the right half with screws or the like. This left half has a chip outlet 13 as shown in Fig. 2.
- a handle 14 for operating a portable circular saw is disposed on the upper rear side of the motor case 2a of the housing 2.
- the node 14 has a switch lever 15 for turning on / off the rotation of the circular saw blade 1 of this portable circular saw.
- the left end of the gear box 2b that supports the saw blade axis la of the circular saw blade 1 is formed as a cylindrical shaft.
- This cylindrical shaft rotatably supports a safety cover 16 that covers the lower half of the circular saw blade 1. When cutting the workpiece W, the safety cover 16 is pushed by the workpiece W and turns into the cover 2c with the cylindrical shaft as a fulcrum.
- the surface plate 4 is arranged below the housing 2 so as to extend in the front-rear direction of the portable circular saw.
- the lower surface of the surface plate 4 has a smooth contact surface that is applied to the workpiece W.
- the center part of the surface plate 4 has an opening 4a through which the circular saw blade 1, the safety cover 16, etc. can pass.
- the motor 6 and the circular saw blade 1 are housed in the housing 2 so that the motor shaft 6a and the saw blade shaft 1a are parallel to each other.
- the surface plate 4 is connected to the housing 2 on the side opposite to the motor shaft 6 a with respect to the saw blade shaft la.
- the starting gear 7a fixed to the motor shaft 6a, the terminal gear 7b fixed to the saw blade shaft la, and the intermediate gears 7c and 7d mesh with each other. This squeezing transmits the rotation of the motor 6 to the circular saw blade 1 at a reduced speed. Therefore, as indicated by an arrow A in FIG. 3, the rotation of the motor 6 is transmitted to the circular saw blade 1 as a rotation in the same direction.
- the housing 2 reacts with the surface plate 4 in the direction of arrow B at the beginning of the motor 6.
- the axis C3 of the intermediate gears 7c, 7d is on the plane P including the axis C1 of the motor shaft 6a and the axis C2 of the saw blade axis la. Positioned with force deviation. Specifically, the axis C3 of the intermediate gears 7c, 7d is biased from the plane P to the rear R1 and closer to the handle 14. Thereby, the reaction at the start of the motor 6 is absorbed by the weight of the intermediate gears 7c, 7d and reduced.
- the nodding 2 and the surface plate 4 are held in a constant posture when the motor 6 is started with the handle 14 held by hand. Therefore, the operator can perform accurate machining without feeling uncomfortable, and the operability is improved. Furthermore, as shown in FIG. 3, the saw blade shaft la, which fixes the end gear 7b, may be positioned rearward R1 from the motor shaft 6a! / ⁇ . This makes it possible to further reduce recoil.
- the extending direction of the surface plate 4 is defined as the front and rear directions Fl and R1.
- Handle 14 is The motor shaft 6a is arranged to be biased to the rear side Rl or one side. That is, the grip portion of the handle 14 is disposed on the rear side R1 with respect to the axis C1 of the motor shaft 6a.
- the gear groups 7b, 7c, 7d connected to the intermediate gears 7c, 7d or the starting gear 7a are arranged so as to be biased to the rear side R1 from the motor shaft 6a. That is, the shaft center C3 of the intermediate gears 7c and 7d is disposed on the rear side R1 with respect to the shaft center C1 of the motor shaft 6a and approaches the handle 14.
- This arrangement of the intermediate gears 7c, 7d shifts the mass center of the cutting machine to the rear R1 and approaches the handle 14. As a result, the mass moment of the cutting machine based on the handle 14 is reduced, the torque applied to the handle 14 is reduced, and the burden on the user is reduced.
- the reaction is further reduced by making the intermediate gears 7c, 7d heavier than the terminal gear 7b or the starting gear 7a.
- the intermediate gear 7d that meshes with the terminal gear 7b must have fewer teeth than the terminal gear 7b for deceleration.
- the weight of the intermediate gear 7d may be increased by increasing the outer diameter by making the transition coefficient larger than that of the terminal gear 7b while maintaining the number of teeth of the intermediate gear 7d.
- the weight of the terminal gear 7b may be reduced by keeping the number of teeth of the terminal gear 7b as it is, and reducing the transition coefficient to reduce the outer diameter.
- the intermediate gears 7c and 7d of the transmission gear train 7 are housed between the motor shaft 6a and the saw blade shaft la in the drive unit.
- This arrangement forms an air gap between the circular saw blade 1 and the motor shaft 6a. That is, the terminal gear 7b is disposed below the starting gear 7a of the drive unit.
- Intermediate gears 7c and 7d overlapped in a plurality of stages are interposed between the start end gear 7a and the end gear 7b.
- a gear box 2b is formed along the outline of the transmission gear train 7.
- This portable circular saw has a control device that controls the motor 6 so that the rotational speed is kept constant regardless of the load variation in the cutting operation.
- the circuit body (not shown) of the control device is housed in the case 28 and fixed to the vicinity of the cooling fan device in the housing 2 via the case 28.
- a rotation speed detection sensor 29 is attached to the circuit body.
- the rotational speed detection sensor 29 protrudes out of the case 28 and enters the fan casing 9.
- a proximity element 30 such as a magnet is attached to the outer peripheral edge of the cooling fan 8 so as to face the rotation speed detection sensor 29. Attached.
- the circuit body calculates the rotational speed of the motor 6 and controls the rotational speed of the motor 6 to a desired value.
- another detection method may be adopted as the rotation speed detection sensor 29.
- the control device case 28 and the cooling fan device fan casing 9 are each slid in the motor shaft direction and inserted into the housing 2 to be fixed in place.
- a guide groove 9a for passing the rotation speed detection sensor 29 extends along the axial direction of the motor shaft 6a.
- the presence of the guide groove 9a disturbs the flow of the cooling air in the fan casing 9. Therefore, as shown in FIGS. 9A and 9B, the case 28 of the control device is provided with a shielding portion 31 that matches the guide groove 9a.
- the shielding portion 31 has a curved surface 31a that is continuous with the inner surface of the fan casing 9 in the same plane.
- the rotational speed detection sensor 29 protrudes from the curved surface 31a as a small protrusion that does not disturb the flow of the cooling air.
- the rotation speed detection sensor 32 may have a streamline extending along the flow direction of the cooling air by the cooling fan 8. In that case, the cooling air generated by the rotation of the cooling fan 8 is made to flow more smoothly and quietly.
- intermediate gears 7c, 7d are arranged in the drive unit at the rear R1 from the plane P including the motor shaft 6a and the saw blade shaft 1a.
- the cutting machine according to the present invention is used to cut a workpiece.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200611001852 DE112006001852T5 (de) | 2005-07-20 | 2006-07-14 | Schneidemaschine |
US11/994,651 US20090272242A1 (en) | 2005-07-20 | 2006-07-14 | Cutting machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-210291 | 2005-07-20 | ||
JP2005210291A JP4113538B2 (ja) | 2005-07-20 | 2005-07-20 | 切断機 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007010852A1 true WO2007010852A1 (ja) | 2007-01-25 |
Family
ID=37668733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/314057 WO2007010852A1 (ja) | 2005-07-20 | 2006-07-14 | 切断機 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090272242A1 (ja) |
JP (1) | JP4113538B2 (ja) |
CN (1) | CN101228010A (ja) |
DE (1) | DE112006001852T5 (ja) |
WO (1) | WO2007010852A1 (ja) |
Cited By (3)
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CN104646752A (zh) * | 2013-11-25 | 2015-05-27 | 苏州宝时得电动工具有限公司 | 一种手持切割机 |
JP2015112652A (ja) * | 2013-12-09 | 2015-06-22 | 株式会社マキタ | 携帯用マルノコ及び携帯用切断機 |
JP2017065267A (ja) * | 2017-01-19 | 2017-04-06 | 株式会社マキタ | 充電式切断工具 |
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JP5184035B2 (ja) * | 2007-10-05 | 2013-04-17 | 株式会社マキタ | 電動工具の減速機構 |
JP2010082737A (ja) * | 2008-09-30 | 2010-04-15 | Hitachi Koki Co Ltd | 卓上切断機 |
JP5327706B2 (ja) * | 2009-02-27 | 2013-10-30 | 日立工機株式会社 | 電動工具 |
JP5526442B2 (ja) * | 2009-03-05 | 2014-06-18 | マックス株式会社 | 携帯用切断機 |
US8919235B2 (en) * | 2009-03-17 | 2014-12-30 | Hitachi Koki Co., Ltd. | Cutting apparatus |
JP5481956B2 (ja) * | 2009-06-16 | 2014-04-23 | 日立工機株式会社 | 携帯用切断機 |
JP5428586B2 (ja) * | 2009-07-01 | 2014-02-26 | 日立工機株式会社 | 切断機 |
JP5318695B2 (ja) * | 2009-08-07 | 2013-10-16 | 株式会社マキタ | 卓上切断機 |
DE102010038676A1 (de) * | 2010-07-30 | 2012-02-02 | Hilti Aktiengesellschaft | Kreissäge |
JP5730602B2 (ja) * | 2011-02-09 | 2015-06-10 | 株式会社マキタ | 切断工具 |
JP6017257B2 (ja) * | 2011-10-20 | 2016-10-26 | 株式会社マキタ | 切断機 |
CN103056927B (zh) * | 2012-01-13 | 2015-12-23 | 泰州市玉林动力机械有限公司 | 一种火场切割机 |
JP5633940B2 (ja) | 2012-03-15 | 2014-12-03 | 日立工機株式会社 | 携帯用電気切断機 |
JP2012135875A (ja) * | 2012-04-16 | 2012-07-19 | Makita Corp | 手持ち式切断工具 |
JP5938652B2 (ja) | 2012-05-10 | 2016-06-22 | パナソニックIpマネジメント株式会社 | 電動工具 |
JP2014079874A (ja) * | 2012-09-26 | 2014-05-08 | Makita Corp | 動力工具 |
JP6129668B2 (ja) | 2012-09-26 | 2017-05-17 | 株式会社マキタ | 電動工具 |
JP2014210327A (ja) * | 2013-04-19 | 2014-11-13 | 株式会社マキタ | 電動工具 |
JP6137471B2 (ja) * | 2013-05-30 | 2017-05-31 | 日立工機株式会社 | コードレス丸のこ |
JP5614602B2 (ja) * | 2013-06-10 | 2014-10-29 | 日立工機株式会社 | 携帯用丸鋸 |
CN111408792A (zh) * | 2014-01-10 | 2020-07-14 | 苏州宝时得电动工具有限公司 | 一种手持切割机 |
JP6352701B2 (ja) * | 2014-07-01 | 2018-07-04 | 株式会社東芝 | 全閉型電動機 |
CN104625217B (zh) * | 2015-01-29 | 2017-01-04 | 浙江精深实业有限公司 | 具有活动防护、锯片定位夹紧与吸尘功能的斜切机 |
JP6331056B2 (ja) * | 2017-03-13 | 2018-05-30 | 日立工機株式会社 | 携帯用電気切断機 |
JP7094721B2 (ja) * | 2018-02-27 | 2022-07-04 | 株式会社マキタ | 電動工具 |
US10875109B1 (en) | 2018-04-30 | 2020-12-29 | Kreg Enterprises, Inc. | Adaptive cutting system |
JP6570701B2 (ja) * | 2018-05-28 | 2019-09-04 | 株式会社マキタ | 携帯用マルノコ及び携帯用切断機 |
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2006
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- 2006-07-14 US US11/994,651 patent/US20090272242A1/en not_active Abandoned
- 2006-07-14 CN CNA2006800264253A patent/CN101228010A/zh active Pending
- 2006-07-14 DE DE200611001852 patent/DE112006001852T5/de not_active Withdrawn
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JPH08275569A (ja) * | 1995-03-31 | 1996-10-18 | Hitachi Koki Co Ltd | 電動工具 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104646752A (zh) * | 2013-11-25 | 2015-05-27 | 苏州宝时得电动工具有限公司 | 一种手持切割机 |
JP2015112652A (ja) * | 2013-12-09 | 2015-06-22 | 株式会社マキタ | 携帯用マルノコ及び携帯用切断機 |
JP2017065267A (ja) * | 2017-01-19 | 2017-04-06 | 株式会社マキタ | 充電式切断工具 |
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CN101228010A (zh) | 2008-07-23 |
JP2007021997A (ja) | 2007-02-01 |
US20090272242A1 (en) | 2009-11-05 |
JP4113538B2 (ja) | 2008-07-09 |
DE112006001852T5 (de) | 2008-06-05 |
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