EP1669163A1 - Verfahren und Vorrichtung zum Schleifen von Holzplatten - Google Patents

Verfahren und Vorrichtung zum Schleifen von Holzplatten Download PDF

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Publication number
EP1669163A1
EP1669163A1 EP05111798A EP05111798A EP1669163A1 EP 1669163 A1 EP1669163 A1 EP 1669163A1 EP 05111798 A EP05111798 A EP 05111798A EP 05111798 A EP05111798 A EP 05111798A EP 1669163 A1 EP1669163 A1 EP 1669163A1
Authority
EP
European Patent Office
Prior art keywords
belt
roller
axis
sanding
platen
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.)
Granted
Application number
EP05111798A
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English (en)
French (fr)
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EP1669163B1 (de
Inventor
Adriano Ferrari
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.)
SCM Group SpA
Original Assignee
SCM Group SpA
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Filing date
Publication date
Application filed by SCM Group SpA filed Critical SCM Group SpA
Publication of EP1669163A1 publication Critical patent/EP1669163A1/de
Application granted granted Critical
Publication of EP1669163B1 publication Critical patent/EP1669163B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/28—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/06—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving members with limited contact area pressing the belt against the work, e.g. shoes sweeping across the whole area to be ground
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18—Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18—Accessories
    • B24B21/20—Accessories for controlling or adjusting the tracking or the tension of the grinding belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18—Accessories
    • B24B21/22—Accessories for producing a reciprocation of the grinding belt normal to its direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/06—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor involving conveyor belts, a sequence of travelling work-tables or the like

Definitions

  • This invention relates to a method and machine for sanding wooden panels and the like, of a type whose basic architecture is substantially known and which is used in the field of secondary machining of wooden parts, especially for sanding flat parts or panels for the furniture and building industries, for example for making tables or cabinet sides for kitchen units or door and window frames for buildings.
  • Machines of this kind and their respective operating modes are designed to remove a thin layer of wooden stock from the panel using an abrasive belt or tool which is driven in a direction tangent to the surface of the part in such a way as to perfectly smooth and finish the surface.
  • the panels are fed in one after the other and made to advance, usually by means of a rubber belt, under at least one sanding unit equipped with a moving abrasive belt.
  • first power-driven shafts with synchronised eccentric parts interposed between the frame and the first orbiting element and the second orbiting motion by the action of second power-driven shafts with eccentric parts interposed between the first orbiting element and the platen, where the first shafts impart a slow circular and relatively wide orbiting motion, whilst the second shafts impart fast circular and relatively narrow orbiting motion, in such a way that each single abrasive particle follows a sort of circular cycloidal path whose total amplitude is equal to the sum "e" of the eccentricities of the two component motions.
  • the operation of the machine included a step of changing the working length of the belt under the platen by unwinding a length of the belt from one reel, causing it to slide under the platen and winding onto the other reel, and a step of pressing the belt against the platen to enable orbital sanding to be carried out.
  • the patent also taught that the belt could be held securely against the platen by means of a generic vacuum chamber located between the belt and the platen and, according to the drawings, exactly under the flat part of the platen.
  • the new machine proposed the use of an endless abrasive belt of the standard, economical type used in sanding units with continuous motion, and positioned lengthways with respect to the direction of panel feed so as not to damage the edge of the belt as happened all too often when the belt was positioned transversally.
  • the novelty of this invention lay in the solution adopted to hold the belt against the platen.
  • the solution consisted of a vacuum applied to the back of the belt, between belt and platen and created by two prismatic suction elements running symmetrically along both sides of the platen in the vicinity of two opposite edges of the active surface in a non-operating zone of the belt, and having on their flat surfaces, facing the back of the belt, a number of holes leading to a vacuum chamber.
  • the vacuum enabled the belt - thanks also to the angle of the flat surfaces with the holes made in them - to adhere to the platen at an appropriate angle and to keep the belt taut and pressed against the platen even after the action of the tensioners had ceased.
  • a sanding machine equipped with an orbiting sanding unit capable of using a traditional endless abrasive belt of the standard, economical type used in sanding units with continuous motion and positioned lengthways with respect to the direction of panel feed so as not to damage the edge of the belt in the manner typical of belts positioned transversally, and whose operating method was such that belt tension would be guaranteed at practically all times, irrespective of system disturbances.
  • This invention therefore has for an aim to overcome the above mentioned problems by introducing a special orbital sanding unit in the sanding machine; in particular by fitting the sanding machine with an orbiting unit that uses a commercial endless belt that operates according to a method whereby the belt turns in such a way as to create a reservoir of operating portions that follow each other to work under the platen, guaranteeing that the belt is tensioned to such an extent that it can turn and at the same time remain firmly pressed against the active surface of the platen.
  • the invention accordingly provides a sanding machine, with a related operating method, equipped with at least one orbiting sanding unit used for sanding panels and adapted to perform sanding operations without creating the above mentioned problems, overcoming all the disadvantages due to unwanted machine shutdowns caused by the breakage of expensive abrasive belts, excessive size and non-modularity, being at once simple in its construction and versatile in its operation and at the same time maintaining the functional features of sanding machines known in prior art, and in fact improving on them.
  • the invention disclosed herein achieves the above mentioned aims through a sanding machine fitted with an orbiting sanding unit of the type stated above, normally mounted above the path followed by the panels in transit through the machine.
  • the invention relates to a wide, endless belt sanding machine whose basic architecture is of substantially known type but which implements a novel abrasive belt tensioning and sanding method.
  • the panels are fed along the X-axis of a right-angled X Y Z coordinate system in a horizontal plane XY and are made to pass under an operating unit with an orbiting platen comprising:
  • Another novel feature is the introduction in the kinematic chain of at least one degree of freedom allowing movement along the Y-axis for the roller, whose supports comprise a beam positioned lengthways along the Y-axis and fitted with respective linear guides on which the roller can move in the Y-axis; the lifting means acting on the beam in such a way as to raise and lower the beam and the roller.
  • a machine made according to this invention can be used to optimum advantage to achieve greater savings compared to prior art machines, enabling it - amongst other things - not only to be used more intensively (thus improving investment profitability) but also to obtain a high commercial value for the products made thanks to lower production costs and higher quality results.
  • the sanding unit 2 which the sanding machine according to this invention is equipped with, is innovative - and at once extremely simple - thanks to the technical solution it embodies, especially as regards its operating method.
  • This specification mainly describes the details that characterise the proposed solution whereas the prior art documents mentioned above are incorporated herein by reference insofar as concerns the parts of the machine that provide the orbiting motion, which are well within the knowledge of those familiar with the trade.
  • the sanding unit 2 comprises a standard double orbiting system where the platen 4, as is customary, constitutes the second orbiting element. In cross section it has the shape of an upturned U extending upwards towards the first orbiting element 19 and has a rectangular active surface 5 which, during work, comes into contact with the back of the belt 3 over the panel.
  • the surface 5, like the platen 4, is positioned with its short sides extending in the X-axis direction of panel 1 feed, and with its long sides extending transversally in the Y-axis direction.
  • elements 26 In the form of elongated cylinders, made of a resilient rubber material, ending in the cavity of the U and having the function of spacers and dampers.
  • elements 26 Above the U of the platen 4, on both sides, there are two pairs of idle rollers 18 for guiding the belt 3, the first pair being mounted on the part of the unit 2 that is attached to the machine frame 17.
  • These parts, and practically the entire general structure of the unit 2 lie in a plane of symmetry YZ that passes through the centre line of the platen 4, as shown in the drawings.
  • the belt 3 is of the endless type. Following the path of the two branches of the belt 3 leading away from the lower pair of rollers 18, and proceeding towards the top of the unit 2, the two branches join - thus closing the belt 3 - at the top of a rubber-coated roller 14 mounted in the upper section of the unit 2.
  • the main roller 14 is rotationally driven by means 6 which enable the belt 3 to turn and which are comprised of an electric motor 7 and an associated reduction gear unit. They constitute the kinematic drive chain 8 that causes the roller 14 to turn.
  • the roller 14 is in turn supported by suitable supporting means 15 that form a mechanism having one degree of freedom for movement in the Y-axis and at least one degree of freedom for movement in the Z-axis. More specifically, there is a beam 15t lying under and parallel to the roller 14 and mounting an arrangement of linear guides 15g on which the roller 14 itself runs, through interposed shoes 24 mounted at the two ends of it, allowing it to move in Y; two pneumatic cylinders 16 acting vertically between the machine frame 17 and the ends of the beam 15t being provided to lift the beam 15t in Z, thus lifting the roller 14 with it in such manner as to adjust the tension of the belt 3 itself.
  • the beam 15t has symmetrically associated with it the upper pair of idle rollers 18, which, like the lower pair, advantageously enable the belt 3 to extend around the roller 14 at a suitable angle.
  • a photocell 27 for detecting the presence/absence of the belt 3 is mounted on the beam 15t at the edge of the belt 3.
  • This photocell generates an on/off signal used in a customary circuit for aligning the belt 3 on the roller 14 in the Y direction, applying different pressure levels to the pneumatic cylinders 16 in such a way that the latter produce slight adjustments to the angle of the roller 14 in the YZ plane.
  • the sanding machine equipped with the operating unit 2 structured in this way achieves the preset aims thanks not only to the mutual arrangement of the different elements, as illustrated, but also to an innovative operating method, without altering the remaining, basic existing structure of the sanding machine.
  • the drive motor 7 causes the roller 14 to turn and to turn the belt 3 with it in the unit 2, including the working part of the belt 3 under the platen 4 and until that working part is different from the used part that has just finished working.
  • This used part as the belt 3 turns, reaches a blowing station 9 - of known type and therefore not described - located on the path of the belt 3 and designed to blow dust off it in order to regenerate it.
  • the roller 14 is stopped; this in turn causes the belt 3, which continues to be kept in the tensioned state by the pneumatic cylinders 16, to stop turning.
  • the mechanism that imparts the double orbiting motion to the platen 4 through the action of the first and second power-driven eccentric shafts 20 and 21 is in operation.
  • the tensioning action exerted by the pneumatic cylinders 16 does not cease when the orbiting motion of the platen 4 starts.
  • the roller 14 may follow the Y-axis components of the oscillatory movements of the platen 4, running on the linear guides 15g on the beam 15t under the pulling action of the belt 3 itself which is in turn following the oscillating motion of the platen.
  • the X-axis components of the oscillatory movements are absorbed by the flexibility inherent in various parts of the system, including first of all, the layer of rubber that covers the roller and a certain degree of elasticity in the circumferential directions of the belt.
  • dampers 25 are provided at the ends of the beam 15t, in the vicinity of the supports of the upper rollers 18, where the belt 3 is usually tauter.
  • the unit 2 comprises a spacer 28 that can be extracted by hand to enable the old belt 3 to be pulled out of the unit 2 and the new one inserted into the space created between the structures of the unit 2 and of the machine frame 17, in the vicinity of one end of the platen 4, when the spacer 28 is removed.
  • the photocell 27 positioned at the edge of the belt 3 detects the presence of the belt 3 itself and its absence when it moves out of position in the axial direction.
  • the on/off output signal of the photocell 27 varies the pressure in the two lift cylinders 16 at the respective ends of the roller 14, so that the end of the roller 14 towards which the belt 3 is moving is lifted a little more than the other end in a succession of small oscillating movements about the centre of the belt 3 on the roller 14 which, as is known, cannot be kept fixed on account of disturbances within the system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP05111798A 2004-12-10 2005-12-07 Verfahren und Maschine zum Schleifen von Holzplatten Not-in-force EP1669163B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000063A ITRN20040063A1 (it) 2004-12-10 2004-12-10 Metodo e macchina per la levigatura di pannelli di legno

Publications (2)

Publication Number Publication Date
EP1669163A1 true EP1669163A1 (de) 2006-06-14
EP1669163B1 EP1669163B1 (de) 2008-03-19

Family

ID=35717720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05111798A Not-in-force EP1669163B1 (de) 2004-12-10 2005-12-07 Verfahren und Maschine zum Schleifen von Holzplatten

Country Status (5)

Country Link
EP (1) EP1669163B1 (de)
AT (1) ATE389509T1 (de)
DE (1) DE602005005427D1 (de)
ES (1) ES2300945T3 (de)
IT (1) ITRN20040063A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2199017A1 (de) 2008-12-17 2010-06-23 Bütfering Schleiftechnik GmbH Schwingungsarmes Maschinenkonzept
CN101407041B (zh) * 2007-10-09 2011-01-05 张文奇 砂光机的旋转轴直线往复运动装置
CN101537592B (zh) * 2009-04-22 2011-03-30 吴鸣 砂光机砂带纠偏机构
CN102581730A (zh) * 2012-01-19 2012-07-18 青岛欣大荣数控机器有限公司 一种异形砂光多轴头装配体
CN103481165A (zh) * 2013-09-07 2014-01-01 佛山市科润达机械有限公司 一种砂边机用的砂架压磨机构
CN107378702A (zh) * 2017-08-31 2017-11-24 太仓陶氏电气有限公司 一种用于散热片加工的可移式三角拉丝机
CN108188845A (zh) * 2018-03-08 2018-06-22 武浩淼 一种板材精磨设备
WO2019037231A1 (zh) * 2017-08-21 2019-02-28 盐城雄鹰精密机械有限公司 适用于多层加工设备的同步纠偏装置
CN109719599A (zh) * 2019-03-13 2019-05-07 广东智多慧智能装备有限公司 铝型材门窗框架打磨装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100020168A1 (it) * 2021-07-28 2023-01-28 Aletti Giovanni E Figli S R L Un sistema e relativo metodo di doppia oscillazione combinata dell’abrasivo per smerigliatrici

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4369601A (en) * 1981-01-27 1983-01-25 Acrometal Products, Inc. Apparatus for tracking belt for abrasive grinding machine
US4742650A (en) * 1986-11-07 1988-05-10 Conestoga Wood Specialities, Inc. Sanding machine
US5179805A (en) * 1988-09-19 1993-01-19 Murunaka & Co., Ltd. Sanding method and apparatus
US5184424A (en) * 1991-10-22 1993-02-09 Miller Todd L Self correcting belt tracking apparatus for widebelt abrasive grinding machine
EP1053827A2 (de) * 1999-05-13 2000-11-22 Costa Levigatrici Spa Bandschleimaschine mit um einer Umlaufbahn bewegendes Schleifband

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4369601A (en) * 1981-01-27 1983-01-25 Acrometal Products, Inc. Apparatus for tracking belt for abrasive grinding machine
US4742650A (en) * 1986-11-07 1988-05-10 Conestoga Wood Specialities, Inc. Sanding machine
US5179805A (en) * 1988-09-19 1993-01-19 Murunaka & Co., Ltd. Sanding method and apparatus
US5184424A (en) * 1991-10-22 1993-02-09 Miller Todd L Self correcting belt tracking apparatus for widebelt abrasive grinding machine
EP1053827A2 (de) * 1999-05-13 2000-11-22 Costa Levigatrici Spa Bandschleimaschine mit um einer Umlaufbahn bewegendes Schleifband

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101407041B (zh) * 2007-10-09 2011-01-05 张文奇 砂光机的旋转轴直线往复运动装置
EP2199017A1 (de) 2008-12-17 2010-06-23 Bütfering Schleiftechnik GmbH Schwingungsarmes Maschinenkonzept
CN101537592B (zh) * 2009-04-22 2011-03-30 吴鸣 砂光机砂带纠偏机构
CN102581730A (zh) * 2012-01-19 2012-07-18 青岛欣大荣数控机器有限公司 一种异形砂光多轴头装配体
CN102581730B (zh) * 2012-01-19 2014-12-24 青岛欣大荣数控机器有限公司 一种异形砂光多轴头装配体
CN103481165A (zh) * 2013-09-07 2014-01-01 佛山市科润达机械有限公司 一种砂边机用的砂架压磨机构
CN103481165B (zh) * 2013-09-07 2015-11-25 刘敬盛 一种砂边机用的砂架压磨机构
WO2019037231A1 (zh) * 2017-08-21 2019-02-28 盐城雄鹰精密机械有限公司 适用于多层加工设备的同步纠偏装置
CN107378702A (zh) * 2017-08-31 2017-11-24 太仓陶氏电气有限公司 一种用于散热片加工的可移式三角拉丝机
CN108188845A (zh) * 2018-03-08 2018-06-22 武浩淼 一种板材精磨设备
CN108188845B (zh) * 2018-03-08 2019-10-18 武浩淼 一种板材精磨设备
CN109719599A (zh) * 2019-03-13 2019-05-07 广东智多慧智能装备有限公司 铝型材门窗框架打磨装置

Also Published As

Publication number Publication date
DE602005005427D1 (de) 2008-04-30
ATE389509T1 (de) 2008-04-15
EP1669163B1 (de) 2008-03-19
ES2300945T3 (es) 2008-06-16
ITRN20040063A1 (it) 2005-03-10

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