US20130048329A1 - Twin saw blade cutter - Google Patents

Twin saw blade cutter Download PDF

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Publication number
US20130048329A1
US20130048329A1 US13/502,596 US201113502596A US2013048329A1 US 20130048329 A1 US20130048329 A1 US 20130048329A1 US 201113502596 A US201113502596 A US 201113502596A US 2013048329 A1 US2013048329 A1 US 2013048329A1
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US
United States
Prior art keywords
output shaft
saw blade
gearwheel
small output
boss
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US13/502,596
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English (en)
Inventor
Zhongguang Qian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NINGBO LUTZ TOOLS Co Ltd
Ronco Asset Owners LLC
Original Assignee
NINGBO BLACKPINE TOOLS CO Ltd
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 NINGBO BLACKPINE TOOLS CO Ltd filed Critical NINGBO BLACKPINE TOOLS CO Ltd
Assigned to NINGBO BLACKPINE TOOLS CO., LTD. reassignment NINGBO BLACKPINE TOOLS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: QIAN, ZHONGGUANG
Publication of US20130048329A1 publication Critical patent/US20130048329A1/en
Assigned to NINGBO LUTZ TOOLS CO., LTD. reassignment NINGBO LUTZ TOOLS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NINGBO BLACKPINE TOOLS CO., LTD.
Assigned to ZGS PENSION LLC reassignment ZGS PENSION LLC COURT ORDER (SEE DOCUMENT FOR DETAILS). Assignors: RONCO HOLDINGS, INC.
Assigned to RONCO ASSET OWNERS, LLC reassignment RONCO ASSET OWNERS, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ZGS PENSION, LLC
Abandoned legal-status Critical Current

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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
    • B23D45/10—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a plurality of circular saw blades
    • 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
    • B23D47/126—Angle drives
    • 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
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • 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
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • B27B5/32—Devices for securing circular saw blades to the saw spindle

Definitions

  • the present utility model relates to a cutting tool, and in particular refers to a cutter with twin saw blades.
  • a type of cutter in common use is a single saw blade cutter with an abrasive wheel cutting blade or a metal cutting blade; during cutting, this will exert a pushing force on the workpiece in the direction of rotation of the cutter, and a corresponding clamping force must be applied to the workpiece in order to ensure that the cutting work progresses smoothly.
  • a common single saw blade cutter is also able to achieve the cutting objective, such a cutter has low operational efficiency, the cutter blades thereof wear quickly, and it is moreover dangerous to operate. For these reasons, people have designed a cutter with twin saw blades; for instance, the “dual saw blade cutter” with Chinese patent grant announcement no.
  • CN2728685Y has disclosed just such a tool, which comprises a machine body and a machine head, the machine head further comprising a guard, a head shell, an inner saw blade, an outer saw blade and a drive mechanism, wherein the drive mechanism is further composed of an output shaft, a sleeve shaft, a first gearwheel, a second gearwheel and a power gear shaft; the sleeve shaft is sleeved onto the output shaft and fixed on an end cover by means of a pair of sleeve shaft bearings, the first gearwheel is fixed on the sleeve shaft, the second gearwheel is fixed on the output shaft, the teeth of the power gear shaft are engaged with the first and second gearwheels respectively, the inner saw blade and an inner pressure plate are sleeved successively on an outer end section of the output shaft, with the inner saw blade being pressed on an outer end face of the sleeve shaft by the inner pressure plate; the inner pressure plate and the output shaft are connected together by a socket connection there
  • the fact that the direction of rotation of the inner saw blade is opposite to that of the outer saw blade during operation means that cutting resistance during the cutting process is small and the forces on the workpiece are small, and therefore the workpiece clamping force is small, operational safety is good, and cutting noise is low, and it is also distinguished by high cutting efficiency and a flat cutting surface.
  • the above twin saw blade cutter will manifest the following deficiencies: (1) As a result of cumulative error in machining of the assembly components, the output shaft will have a certain degree of axial play, which will cause the outer saw blade to have axial play, with the end result that the smoothness of rotation of the inner and outer saw blades will be affected.
  • the power gear shaft forms a drive pair which is a spiral bevel gear set with the first gearwheel and the second gearwheel respectively, and these rotate in forward and reverse directions around the same center of rotation; this structure results in the power gear shaft always having the tendency to be displaced axially towards the side of the first gearwheel and the second gearwheel when it is rotating, and thus after a long period of operation, wear between the power gear shaft and the first and second gearwheels will be accelerated; in serious cases, proper meshing will become impossible and the phenomenon of free spinning will occur.
  • the method of mounting the inner and outer saw blades cannot ensure the coaxiality and perpendicularity of the saw blades relative to the center of rotation.
  • the technical problem which the present utility model seeks to solve is to provide a twin saw blade cutter capable of effectively avoiding axial play in the small output shaft in response to the current technical situation described above, and thereby enable the relative positions of the inner and outer saw blades to be ensured, such that cutting work can proceed smoothly.
  • the twin saw blade cutter comprises a machine body and a machine head, the machine head further including a gearwheel box, an inner saw blade, an outer saw blade and a drive mechanism, wherein the drive mechanism is further composed of a small output shaft, a large output shaft sleeved on the small output shaft, a first gearwheel, a second gearwheel and a power gear shaft, with said large output shaft being mounted in a box cover of the gearwheel box by means of a first and a second bearing, and said small output shaft being supported in an inner hole of said large output shaft and in a box body of the gearwheel box by means of a third bearing and a fourth bearing; said first gearwheel is sleeved loosely on said small output shaft by means of a fifth bearing, and fixed on said large output shaft; the second gearwheel is fixed on said small output shaft, and is arranged opposite to said first gearwheel; said power gear shaft extends into said machine head through a through-hole on the box body
  • an end face of said second gearwheel can have a recess thereon, with said flexible piece sitting in the recess, which serves to locate the flexible piece.
  • said through-hole can be a stepped hole which narrows towards the side of said first and second gearwheels
  • a sixth bearing which supports said power gear shaft is located in a large hole of the stepped hole, and at the same time said power gear shaft has a step thereon which presses against an outer end face of said sixth bearing.
  • the step on the stepped hole and the step on the power gear shaft can be used to effectively prevent the power gear shaft from moving towards the side of the first and second gearwheels, in order to ensure normal meshing between the gearwheels, reduced wear and smooth running.
  • the following structure can be used as a fixing method between the inner saw blade and the large output shaft: a plurality of pin holes are distributed concentrically on an outer end face of said large output shaft, while the inner saw blade is provided thereon with through-holes corresponding to the plurality of pin holes, and pins are inserted into said pin holes after passing through the through-holes to achieve fixing of said inner saw blade to the large output shaft.
  • This structure transmits the cutting force through three pin shafts, can ensure the coaxiality, perpendicularity and pulsation of the inner saw blade relative to the center of rotation, is convenient to manufacture and facilitates mass production.
  • the outer end face of said large output shaft has a polygonal boss thereon, while said inner saw blade is provided thereon with a mounting hole which fits the boss closely, and said boss is inserted tightly into said mounting hole to achieve fixing of said inner saw blade to the large output shaft.
  • an outer end section of said small output shaft is produced with an integral platform for said outer saw blade to bear against, a plurality of pin holes being distributed concentrically on the platform, while the outer saw blade is provided thereon with through-holes corresponding to the plurality of pin holes, and pins after passing through the through-holes are inserted into the corresponding pin holes to achieve fixing of said outer saw blade to the small output shaft.
  • an end section of said small output shaft is produced with an integral platform for said outer saw blade to bear against, with the platform having a polygonal boss thereon, the height of the boss being less than the thickness of the outer saw blade, and a screw hole being axially provided in the boss;
  • a mounting hole matching the boss is provided on said outer saw blade, said outer saw blade is fitted over said boss by means of the mounting hole, a pressure plate is held against the outer side of said outer saw blade, and a screw is thread-connected in said screw hole after passing through said pressure plate to achieve fixing of said outer saw blade to the small output shaft.
  • This solution can ensure that the outer saw blade is pressed tightly onto the boss and fastened to the small output shaft to form a single unit, such that minimum runout of the outer saw blade is maintained during rotation, with the result that the outer saw blade cuts smoothly and the transmitted torque is large, and it also facilitates mass production.
  • said first bearing and third bearing are located in the same sectional plane, this cross-section being perpendicular to said small output shaft; such a solution helps to improve rigidity of support.
  • the fact that two annular locking grooves and two locking springs are added in the present utility model means that the pressing of the first locking spring against the end surface of the fifth bearing can be utilized to prevent outward protrusion of the small output shaft, while retraction of the small output shaft can be prevented with the aid of the second locking spring; at the same time, the added flexible piece can not only absorb the cumulative tolerance arising in the manufacture of various components such as the gearwheel box, ensuring coincidence of the axial positions of the large and small output shafts after installation, but can also cause the small output shaft to have a tendency towards outward protrusion at all times, such that the small output shaft is preloaded in the axial direction, ensuring that the inner saw blade has a limited amount of space for sliding movement left and right; as a result, it can be ensured that there is an appropriate gap between the two saw blades at all times, such that the cutting operation may proceed smoothly and reliably.
  • FIG. 1 is a schematic diagram of the structure of an embodiment of the present utility model
  • FIG. 2 is an enlarged schematic diagram of the machine head part in FIG. 1 ;
  • FIG. 3 is a semi-sectional schematic diagram of the large output shaft in FIG. 1 ;
  • FIG. 4 is a view from above of FIG. 3 ;
  • FIG. 5 is a semi-sectional schematic diagram of the small output shaft in FIG. 1 ;
  • FIG. 6 is a view from above of FIG. 5 ;
  • FIG. 7 is a semi-sectional schematic diagram of another structure of the large output shaft in FIG. 1 ;
  • FIG. 8 is a view from above of FIG. 7 ;
  • FIG. 9 is a semi-sectional schematic diagram of another structure of the small output shaft in FIG. 1 ;
  • FIG. 10 is a view from above of FIG. 9 .
  • the twin saw blade cutter comprises a machine body 1 and a machine head 2 , the machine head 2 further including a box body 21 and box cover 22 of a gearwheel box, an inner saw blade A, an outer saw blade B and a drive mechanism 3 , the drive mechanism being further composed of a large output shaft 31 , a small output shaft 32 , a first gearwheel 33 , a second gearwheel 34 and a power gear shaft 35 , wherein the box body 21 of the gearwheel box is fixed to the machine body 1 ; the large output shaft 31 is sleeved on the small output shaft 32 , the large output shaft 31 being mounted in the box cover 22 of the gearwheel box by means of a first bearing 4 and a second bearing 5 ; the small output shaft 32 is supported in an inner hole of said large output shaft and in the box body of the gearwheel box by means of a third bearing 6 and a fourth bearing 7 , the first gearwheel 33 is sleeved loosely on the small output shaft 32 by means of a third bearing 6 and a fourth bearing
  • a motor 11 is mounted in the machine body 1 , an output shaft of the motor being the power gear shaft 35 , which extends into the machine head 2 , supported by a sixth bearing 9 , through a through-hole on the box body of the gearwheel box, with teeth on an end section of the power gear shaft engaging with the first and second gearwheels respectively.
  • the power gear shaft 35 rotates, and can set the first gearwheel 33 and the second gearwheel 34 in rotation, in such a way that the first gearwheel and the second gearwheel have opposite directions of rotation, so that the large and small output shafts have opposite directions of rotation, with the final result that the inner and outer saw blades rotate in opposite directions, achieving the objective of having the cutting forces cancel each other out.
  • the small output shaft 32 is designed to also have a first annular locking groove 321 and a second annular locking groove 322 , please refer to FIG.
  • the first annular locking groove and the second annular locking groove are located between the first gearwheel 33 and the second gearwheel 34 , a first locking spring C which presses against said fifth bearing 8 is mounted in the first annular locking groove, a second locking spring D is mounted in the second annular locking groove, and at the same time an end face of the second gearwheel also has a recess 341 thereon, with the recess 341 being provided therein with a flexible piece 10 which arches towards the side of the second locking spring D and presses against the second locking spring; in the present embodiment, a butterfly flexible piece is used as the flexible piece.
  • said through-hole is designed as a stepped hole 211 which narrows towards the side of the first and second gearwheels, said sixth bearing 9 being located in a large hole of the stepped hole, and at the same time the power gear shaft has a step 351 thereon which presses against an outer end face of the sixth bearing 9 .
  • the step on the stepped hole and the step on the power gear shaft can be used to prevent the power gear shaft from moving towards the side of the first and second gearwheels; thus the axial component of force generated will not change the center-to-center spacing at installation, in order to ensure normal meshing between the gearwheels and smooth running.
  • said first bearing 4 and third bearing 6 are located in the same cross-section, which is the cross-section along line A-A shown in FIG. 2 ; this cross-section is perpendicular to the small output shaft, and such a structure has good rigidity of support, making the rotation of the large and small output shafts more stable and reliable.
  • the methods of fixing the inner and outer saw blades to the large and small output shafts respectively are as follows: a plurality of pin holes 311 are distributed concentrically on an outer end face of said large output shaft 31 ; here, there are three pin holes which are uniformly distributed on the outer end face of the large output shaft, please refer to FIG. 3 and FIG. 4 ; while the inner saw blade is provided thereon with through-holes corresponding to the plurality of pin holes (not shown in the figures), and pins 20 are inserted into said pin holes 311 after passing through the through-holes to achieve fixing of the inner saw blade A to the large output shaft.
  • an outer end section of the small output shaft 32 is produced with an integral platform 323 for the outer saw blade B to bear against, and three pin holes 324 are distributed concentrically on the platform, please refer to FIG. 5 and FIG. 6 ; while the outer saw blade is provided thereon with through-holes corresponding to the three pin holes (not shown in the figures), and pins 20 after passing through the through-holes are inserted into the corresponding pin holes 324 to achieve fixing of the outer saw blade to the small output shaft; at the same time, a pressure plate 30 can be provided on the outer side of the outer saw blade, and a screw 40 is thread-connected in a screw hole 325 of the small output shaft after passing through the pressure plate, to further lock the outer saw blade B.
  • the cutting force is transmitted by three pin shafts, so the coaxiality, perpendicularity and pulsation of the saw blades relative to the center of rotation can be ensured, and the technology is simple, with good manufacturability, facilitating mass production.
  • the outer end face of the large output shaft 31 a has an approximately triangular boss e thereon, while the inner saw blade is provided thereon with a mounting hole which fits the boss closely, and the boss is inserted tightly into the mounting hole to achieve fixing of the inner saw blade A to the large output shaft, please refer to FIG. 7 and FIG. 8 .
  • the outer end section of the small output shaft 32 is produced with an integral platform 323 a for said outer saw blade to bear against, with the platform having an approximately triangular boss f thereon, the height of the boss being less than the thickness of the outer saw blade B, and a screw hole 325 a being axially provided in the boss, please refer to FIG. 9 and FIG. 10 ; a mounting hole matching the boss is provided on the outer saw blade, the outer saw blade is fitted over the boss by means of the mounting hole, the pressure plate 30 is likewise held against the outer side of the outer saw blade B, and the screw 40 is thread-connected in said screw hole 325 a after passing through the pressure plate to achieve fixing of the outer saw blade B to the small output shaft 32 .
  • Such a structure enables strict control of the concentricity, axial positioning and perpendicularity of the saw blades relative to their respective output shafts, with the result that the saw blades cut smoothly and the transmitted torque is large, and it also facilitates mass production.
  • the shape of the boss need not rigidly adhere to the triangular structure described above. All technical solutions formed using equivalent variations or substitutions with identical effects should all fall within the scope of protection of the claims of the present utility model.

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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)
  • Harvester Elements (AREA)
US13/502,596 2010-11-30 2011-07-18 Twin saw blade cutter Abandoned US20130048329A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN2010206495823U CN201931158U (zh) 2010-11-30 2010-11-30 双锯片切割机
CN201020649582.3 2010-11-30
PCT/CN2011/001171 WO2012071775A1 (zh) 2010-11-30 2011-07-18 双锯片切割机

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/001171 A-371-Of-International WO2012071775A1 (zh) 2010-11-30 2011-07-18 双锯片切割机

Related Child Applications (1)

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US15/130,171 Division US10124427B2 (en) 2010-11-30 2016-04-15 Twin saw blade cutter

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US20130048329A1 true US20130048329A1 (en) 2013-02-28

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US13/502,596 Abandoned US20130048329A1 (en) 2010-11-30 2011-07-18 Twin saw blade cutter
US15/130,171 Expired - Fee Related US10124427B2 (en) 2010-11-30 2016-04-15 Twin saw blade cutter

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US15/130,171 Expired - Fee Related US10124427B2 (en) 2010-11-30 2016-04-15 Twin saw blade cutter

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US (2) US20130048329A1 (es)
EP (1) EP2633934A1 (es)
JP (1) JP3187641U (es)
CN (1) CN201931158U (es)
AU (1) AU2011325888B2 (es)
CA (1) CA2779801C (es)
DE (1) DE202011110170U1 (es)
ES (1) ES2408385B1 (es)
WO (1) WO2012071775A1 (es)

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RU2693074C2 (ru) * 2014-07-14 2019-07-01 Аарбакке Инновэйшн А.С. Инструмент для внутрискважинных работ для проходки сквозь препятствия в стволе скважины
CN111097948A (zh) * 2020-02-11 2020-05-05 东阳温宾电子科技有限公司 一种手持式深孔铣削装置
US10882123B2 (en) 2015-02-25 2021-01-05 Milwaukee Electric Tool Corporation Miter saw
US20230398613A1 (en) * 2022-06-14 2023-12-14 Kennametal Inc. Cutting tools and cutting apparatus having contrary rotating portions

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US20140150622A1 (en) * 2011-10-17 2014-06-05 Jiaxing Yat Institution Of Gardening And Forestry Machinery Rotary bevelment composite saw blade
CN203228048U (zh) * 2013-03-20 2013-10-09 宁波德丰动力科技有限公司 同心逆转双锯片安装装置及具有该装置的双锯片切割机
CN104551221B (zh) * 2014-12-03 2017-08-29 浙江亚特电器有限公司 适配集成旋转对切锯片的传动装置及集成旋转对切锯
CN113996862B (zh) * 2021-11-12 2022-08-26 安徽雄峰建材有限公司 一种防溢水高矮框型材的加工设备

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US10124427B2 (en) 2018-11-13
JP3187641U (ja) 2013-12-12
DE202011110170U1 (de) 2013-03-06
US20160228959A1 (en) 2016-08-11
AU2011325888B2 (en) 2013-12-05
CA2779801A1 (en) 2012-06-07
CN201931158U (zh) 2011-08-17
ES2408385A2 (es) 2013-06-20
AU2011325888A2 (en) 2012-06-21
AU2011325888A1 (en) 2012-06-14
ES2408385B1 (es) 2014-05-29
CA2779801C (en) 2015-07-07
EP2633934A1 (en) 2013-09-04
WO2012071775A1 (zh) 2012-06-07
ES2408385R1 (es) 2013-11-06

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