EP0571343A1 - Schleifmaschine für Holzplatten - Google Patents

Schleifmaschine für Holzplatten Download PDF

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Publication number
EP0571343A1
EP0571343A1 EP93830214A EP93830214A EP0571343A1 EP 0571343 A1 EP0571343 A1 EP 0571343A1 EP 93830214 A EP93830214 A EP 93830214A EP 93830214 A EP93830214 A EP 93830214A EP 0571343 A1 EP0571343 A1 EP 0571343A1
Authority
EP
European Patent Office
Prior art keywords
machine
panel
conveyor
pads
ducts
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.)
Withdrawn
Application number
EP93830214A
Other languages
English (en)
French (fr)
Inventor
Gino Botteghi
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.)
DMC SpA
Original Assignee
DMC SpA
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 DMC SpA filed Critical DMC SpA
Publication of EP0571343A1 publication Critical patent/EP0571343A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • B24B21/08—Pressure shoes; Pressure members, e.g. backing belts

Definitions

  • the present invention relates to a wide belt sander for wood panels.
  • Machines of the type in question generally comprise an upright frame supporting a conveyor on which workpieces to be sanded (panels) are fed through in a longitudinal direction, and above the conveyor, sanding means disposed parallel to the conveying surface and consisting in an abrasive belt looped around a set of mutually parallel rollers of which the axes are disposed transversely to the conveyor.
  • sanding means disposed parallel to the conveying surface and consisting in an abrasive belt looped around a set of mutually parallel rollers of which the axes are disposed transversely to the conveyor.
  • the abrasive belt is tensioned by the action of fluid power cylinders impinging on the rollers (a single machine obviously might be equipped with a number of sets of rollers carrying a succession of sanding belts arranged along the feed axis and supported by the one frame).
  • the typical machine further comprises a plurality of pressure elements acting on one portion of the abrasive belt loop, normally between two successive rollers positioned immediately above the conveying surface, each individually capable of directing the belt downwards toward the conveyor.
  • the resulting battery of pressure elements compasses at least the full width of the conveyor, and is designed thus to afford a controlled sanding action by ensuring that the abrasive belt engages the entire surface of the work, even in the event that the panel may present rough patches or areas of dissimilar thickness.
  • Such pressure elements consist generally in a pad operated by an actuator, for example a pneumatic cylinder, and positioned to impinge on the abrasive belt.
  • the single machine will comprise several actuators and several pads disposed one alongside the other (the number of the actuator-pad assemblies variable according to the width of the abrasive belt and the transverse dimension of the conveyor) and functioning in the manner of piano keys, with each actuator-pad assembly activated by a relative control medium (for example, a solenoid valve activated in turn by a corresponding feeler installed preceding the pad in the feed direction) and invested with movement between a limit position substantially of operation, in which the pad rides in contact with the belt, and a limit position of deselection, distanced from the belt.
  • a relative control medium for example, a solenoid valve activated in turn by a corresponding feeler installed preceding the pad in the feed direction
  • the actuator-pad assemblies are mounted to a cross member positioned above the abrasive belt, located between the tension rollers and in most instances arranged transversely with respect to the conveyor on which the panel is fed through.
  • the cross member is secured in its turn to the frame of the machine.
  • the signals triggered by the feelers are directed into a central control unit and processed with reference to previously entered parameters, whereupon the unit pilots the descent and/or the ascent of the different actuator-pad assemblies (the pneumatic cylinder is generally a spring-returned single acting type) according to the information received, which as intimated above will reflect the proportions of the panel fed into the machine.
  • the control unit also measures the distance between the array of feelers and the cross member to which the actuator-pad assemblies are mounted, and thus can calculate the moment when the pad must respond, according to the rate of feed and the length of the panel.
  • the relative positioning of the actuators can be selected, again by way of the control unit, in such a manner as to ensure that panels do not emerge with particular defects, for example, rounded side edges. This is achieved conventionally by programming the control unit to lower (i.e.
  • the main drawback betrayed by wide belt sanders is precisely the difficulty in achieving a genuinely controlled, or at least selective sanding action, on especially delicate areas of a panel.
  • the object of the present invention is to eliminate the aforementioned difficulties by providing a wide belt sander equipped with a pneumatic system such as will allow the application of differentiated pressures through the actuator-and-pad assemblies, bringing the benefit of a selective sanding action commensurate with the finishing requirements for a given panel.
  • a wide belt sander for wood panels comprises at least one sanding head 1, consisting in a set of mutually parallel rollers 3 (three rollers in the example of fig 1) positioned above and extending in transverse or longitudinal alignment with a flat conveyor 4 on which the panels 2 are fed through the machine, and a length of abrasive belt 5 looped around and tensioned by the rollers 3, and capable of movement parallel with or transversely to the conveyor 4 according to the finish required.
  • a sanding head 1 consisting in a set of mutually parallel rollers 3 (three rollers in the example of fig 1) positioned above and extending in transverse or longitudinal alignment with a flat conveyor 4 on which the panels 2 are fed through the machine, and a length of abrasive belt 5 looped around and tensioned by the rollers 3, and capable of movement parallel with or transversely to the conveyor 4 according to the finish required.
  • the sanding head 1 further comprises a plurality of pads 6 located between two of the three rollers 3, and more exactly those nearer to the conveyor 4, disposed one alongside the next along a direction parallel to the axes of the rollers 3 and engaged in sliding contact with the reverse face of the abrasive belt 5, i.e. the face opposite from that by which the panel 2 is sanded.
  • Each such pad 6 is supported and actuated by one of a corresponding plurality of pneumatic elements 7, illustrated in the example of fig 2 as single acting cylinders 13, mounted to a cross member 8 affording a respective plurality of individual seatings and able thus to operate independently of one another. Accordingly, each single pad 6 can be directed by the relative cylinder 13 toward the conveyor 4 (in the activated or ON condition), applying a predetermined pressing force F, or distanced from the conveyor (deselected or OFF).
  • the single cylinders 13 are interlocked to relative sensing means 9 able to establish the dimensions of the panel 2 and pilot the operation of monitoring and control means 10 by which the air supply to the cylinders 13 is switched on and off.
  • the sensing means 9 in question might consist, by way of example, in a plurality of transducers 14 such as voltage dividers or potentiometers, arrayed parallel to and preceding the battery of pads 6 in the direction followed by the panel 2.
  • the function of the transducers 14 is to intercept the panel 2 entering the machine and generate voltage signals proportional to the thickness and the horizontal dimensions encountered.
  • the outputs of the transducers 14 are connected to an analog-digital converter 15, connected in turn to one input of an electronic processor 16 of which the outputs control the air supply to the pneumatic cylinders 13.
  • a second input of the processor 16 is connected to further transducers 17 (for example, analog or digital sensors) capable of measuring the distance travelled by the panel 2; accordingly, the cylinders 13 and the pads 6 can be operated both in response to the signals generated by the dimension transducers 14, and allowing for the difference in position between these same transducers 14 and the line of cylinders 13 as calculated by the distance transducers 17.
  • each of the cylinders 13 is connected to and able to receive compressed air from two independent ducts 11 and 12 of which the internal pressures, denoted respectively P1 and P2, are dissimilar.
  • the ducts 11 and 12 are controlled by the electronic processor 10 in such a way as to allow of regulating the pressing force F applied by way of the cylinders 13 and pads 6 according to the dimensions, geometry and physical properties of the panel 2, on the basis of preset values programmed into the processor 16.
  • Each cylinder 13 is connected pneumatically to the ducts 11 and 12 by way of a pair of conventional valves 18a and 18b (illustrated by graphic symbols in fig 2) interposed between the ducts 11 and 12 and the cylinder 13 and constituting a part of the monitoring and control means 10.
  • the valves 18a and 18b are also connected electrically to the output of the processor 16, which is programmed to respond to the input data received from the transducers by generating an activating signal P1 ON or P2 ON to connect the cylinder 13 to the relative duct 11 or 12, or a deactivating signal OFF which closes the valve 18a or 18b.
  • a third signal might obviously be one that closes both valves 18a and 18b, leaving the cylinder 13 disconnected from the air supply altogether and vented to the atmosphere (as shown in fig 2).
  • one of the two ducts 11 and 12 might be incorporated directly into the cross member 8 (as indicated schematically in fig 1).
  • one of the ducts 11 or 12 might also be depressurized completely (zero pressure denoted P0 in the drawings).
  • a machine structured in the manner thus described is able to produce a variety of sanding actions on panels 2 exhibiting particular types of surface, as illustrated by way of example in figs 3 to 10 where the arrow denoted F1 is the feed direction followed by the panel 2, and the arrow denoted F2 indicates the direction of movement of the abrasive belt 5; P1 denotes a pressure value lower than P2, whilst E denotes that the cylinder 13 is deselected, that is to say, not activated at all during the passage of the panel 2.
  • figs 3 to 7 show an abrasive belt 5 running transversely to the feed direction of the panel 2 carried forward by the conveyor 4 (in such a way as to follow the grain of a natural wood, for example), whereas in fig 8 the abrasive belt 5 runs parallel with and against the feed direction.
  • the respective panels 2 exhibit edges B bearing traces of a hard bonding adhesive, and edges B1 projecting above the remaining surface area.
  • the machine disclosed operates thus: as a panel 2 fed in on the conveyor 4 is intercepted by the transducers 14, the signals generated are received by the electronic processor 16, which analyzes and compares the values with stored parameters (shape and dimensions, type of wood, special geometries if any), before applying the appropriate activating signal P1 ON or P2 ON to the valves 18a and 18b of the individual cylinders 13. Any cylinders 13 not required for the panel 2 in hand are deselected (E) by the processor 16, needless to say. Similarly, a cylinder 13 can be deactivated (P0) temporarily or momentarily during the pass by depressurizing the relative duct 11 or 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP93830214A 1992-05-21 1993-05-19 Schleifmaschine für Holzplatten Withdrawn EP0571343A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO920194 1992-05-21
ITBO920194A IT1257801B (it) 1992-05-21 1992-05-21 Macchina levigatrice di pannelli in legno

Publications (1)

Publication Number Publication Date
EP0571343A1 true EP0571343A1 (de) 1993-11-24

Family

ID=11338283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93830214A Withdrawn EP0571343A1 (de) 1992-05-21 1993-05-19 Schleifmaschine für Holzplatten

Country Status (2)

Country Link
EP (1) EP0571343A1 (de)
IT (1) IT1257801B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976495A1 (de) * 1998-07-28 2000-02-02 Jürgen Dipl.-Ing. Heesemann Bandschleifmaschine
EP1070567A1 (de) * 1999-07-20 2001-01-24 Gebr. Bütfering Maschinenfabrik GmbH Druckbalken
EP1719586A1 (de) * 2005-05-02 2006-11-08 SCM GROUP S.p.A. Druckbalken
WO2007031066A1 (de) * 2005-09-12 2007-03-22 Lissmac Maschinenbau Und Diamantwerkzeuge Gmbh Vorrichtung zum entgratenden oder abschleifenden bearbeiten eines band- oder plattenförmigen metallischen werkstücks
US20120302138A1 (en) * 2011-05-27 2012-11-29 Hans Weber Maschinenfabrik Gmbh Continuous grinding machine
DE202013102671U1 (de) 2013-06-20 2014-09-23 Weeke Bohrsysteme Gmbh Dickeneinstellung für Schleifmaschinen
IT201800007999A1 (it) * 2018-08-09 2020-02-09 Viet Italia Srl Macchina levigatrice per la levigatura/satinatura di pannelli di legno, metallo, o simili

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110936256B (zh) * 2019-12-09 2020-12-04 深圳市翔宇电路有限公司 一种pcb线路板单面处理设备
CN114473665A (zh) * 2021-12-25 2022-05-13 上海苏庆木业有限公司 一种家具生产板材砂光装置及其使用方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374583A (en) * 1965-09-20 1968-03-26 Walter Jacobi & Sons Inc Apparatus for finishing surfaces
US4527359A (en) * 1984-04-23 1985-07-09 Timesavers, Inc. Segmented platen with diaphragm cylinder control
EP0155380A1 (de) * 1984-01-21 1985-09-25 Karl Heesemann Maschinenfabrik GmbH & Co KG Bandschleifmaschine
EP0210654A2 (de) * 1985-07-30 1987-02-04 Georg Weber Bandschleifmaschine
DE3716832A1 (de) * 1987-05-20 1988-12-01 Boettcher Renardy & Co Gmbh Verfahren zum betrieb einer bandschleifmaschine sowie bandschleifmaschine
DE4116746A1 (de) * 1990-05-24 1992-02-13 Sbf Consult S R L Steuerbarer druckbalken zum schleifen plattenfoermiger werkstuecke

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374583A (en) * 1965-09-20 1968-03-26 Walter Jacobi & Sons Inc Apparatus for finishing surfaces
EP0155380A1 (de) * 1984-01-21 1985-09-25 Karl Heesemann Maschinenfabrik GmbH & Co KG Bandschleifmaschine
US4527359A (en) * 1984-04-23 1985-07-09 Timesavers, Inc. Segmented platen with diaphragm cylinder control
EP0210654A2 (de) * 1985-07-30 1987-02-04 Georg Weber Bandschleifmaschine
DE3716832A1 (de) * 1987-05-20 1988-12-01 Boettcher Renardy & Co Gmbh Verfahren zum betrieb einer bandschleifmaschine sowie bandschleifmaschine
DE4116746A1 (de) * 1990-05-24 1992-02-13 Sbf Consult S R L Steuerbarer druckbalken zum schleifen plattenfoermiger werkstuecke

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976495A1 (de) * 1998-07-28 2000-02-02 Jürgen Dipl.-Ing. Heesemann Bandschleifmaschine
US6290570B1 (en) 1998-07-28 2001-09-18 Juergen Heesemann Belt grinding machine
EP1070567A1 (de) * 1999-07-20 2001-01-24 Gebr. Bütfering Maschinenfabrik GmbH Druckbalken
EP1719586A1 (de) * 2005-05-02 2006-11-08 SCM GROUP S.p.A. Druckbalken
WO2007031066A1 (de) * 2005-09-12 2007-03-22 Lissmac Maschinenbau Und Diamantwerkzeuge Gmbh Vorrichtung zum entgratenden oder abschleifenden bearbeiten eines band- oder plattenförmigen metallischen werkstücks
US7614935B2 (en) 2005-09-12 2009-11-10 Lissmac Maschinebau Und Diamantwerkzeuge Gmbh Apparatus for machining a workpiece
US20120302138A1 (en) * 2011-05-27 2012-11-29 Hans Weber Maschinenfabrik Gmbh Continuous grinding machine
US8784158B2 (en) * 2011-05-27 2014-07-22 Hans Weber Maschinenfabrik Gmbh Continuous grinding machine
DE202013102671U1 (de) 2013-06-20 2014-09-23 Weeke Bohrsysteme Gmbh Dickeneinstellung für Schleifmaschinen
EP2815844A1 (de) 2013-06-20 2014-12-24 Weeke Bohrsysteme GmbH Dickeneinstellung für Schleifmaschinen
IT201800007999A1 (it) * 2018-08-09 2020-02-09 Viet Italia Srl Macchina levigatrice per la levigatura/satinatura di pannelli di legno, metallo, o simili
EP3608056A1 (de) * 2018-08-09 2020-02-12 Viet Italia S.r.l. Schleifmaschine zum schleifen von platten aus holz, metall oder ähnlichen stoffen
US11548112B2 (en) 2018-08-09 2023-01-10 Biesse S.P.A. Sanding machine for the sanding/finishing panels made of wood, metal, or the like

Also Published As

Publication number Publication date
ITBO920194A0 (it) 1992-05-21
ITBO920194A1 (it) 1993-11-21
IT1257801B (it) 1996-02-13

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