EP0084504B1 - Apparat zum Schleifen von Glaskanten - Google Patents

Apparat zum Schleifen von Glaskanten Download PDF

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Publication number
EP0084504B1
EP0084504B1 EP83400129A EP83400129A EP0084504B1 EP 0084504 B1 EP0084504 B1 EP 0084504B1 EP 83400129 A EP83400129 A EP 83400129A EP 83400129 A EP83400129 A EP 83400129A EP 0084504 B1 EP0084504 B1 EP 0084504B1
Authority
EP
European Patent Office
Prior art keywords
grinding
glass sheet
tool
pressure
carriage
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.)
Expired
Application number
EP83400129A
Other languages
English (en)
French (fr)
Other versions
EP0084504A3 (en
EP0084504A2 (de
Inventor
Friedrich Halberschmidt
Heinz-Josef Reinmold
Norbert Schwarzenberg
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.)
Vegla Vereinigte Glaswerke GmbH
Saint Gobain Vitrage SA
Original Assignee
Vegla Vereinigte Glaswerke GmbH
Saint Gobain Vitrage SA
Saint Gobain Vitrage International SA
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 Vegla Vereinigte Glaswerke GmbH, Saint Gobain Vitrage SA, Saint Gobain Vitrage International SA filed Critical Vegla Vereinigte Glaswerke GmbH
Publication of EP0084504A2 publication Critical patent/EP0084504A2/de
Publication of EP0084504A3 publication Critical patent/EP0084504A3/fr
Application granted granted Critical
Publication of EP0084504B1 publication Critical patent/EP0084504B1/de
Expired legal-status Critical Current

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    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass

Definitions

  • the present invention relates to an apparatus for grinding the edges of glass sheets using a grinding tool rotatably mounted on a tool holder which can be moved in a direction perpendicular to the edge of the glass sheet and on which acts a pressure means by which the grinding tool is pressed against the glass sheet under an adjustable force.
  • the document DE-C-19 66 260 (or its French correspondent FR-A-1 588 348) describes an apparatus as above in which the device serving to press the grinding tool against the edges of the glass sheet is constituted by a double-acting cylinder, a modification of the pressure in the cylinder of the cylinder making it possible to adjust the grinding pressure.
  • document US-A-3 803 772 describes a grinding machine provided with an adjustable pressure device to maintain a constant force of engagement between the grinding wheel and the workpiece, this device comprising a motor constant torque electric.
  • Pneumatic or hydraulic cylinders used as pressure means require additional lines for the supply of pressurized fluid.
  • additional devices are required.
  • the object of the invention is to improve the grinding apparatuses with adjustable grinding pressure according to document DE-C-1 996 260 in such a way that their structure is simplified, their working method safer, the regulatory oscillations eliminated, finer and more precise grinding pressure regulation.
  • the pressure device is formed by a constant torque electric motor which is articulated on the tool holder by means of a crank arm, the pressure exerted by the constant torque motor being transmitted to the tool holder by means of a pressure capsule, the electrical output signal of which is supplied, as a setpoint regulating the grinding pressure, to a regulating amplifier which controls the torque motor constant.
  • the embodiment according to the invention offers decisive advantages: firstly, it makes it possible to eliminate the additional pressurized fluid lines as well as the expensive mechanical devices for modifying and regulating the pressure of the pressurized fluid. Secondly, and this is particularly important, the grinding pressure can be adjusted and changed much more precisely, and at relatively reduced cost.
  • the oscillations produced by the regulation circuit are several times lower than those produced when a jack is used. The reason for this is that the journal friction is insignificant in the case of the constant torque motor compared to the friction of the piston in the cylinder of the jack in the known apparatus.
  • Fine regulation of the grinding pressure also requires mounting the tool holder with minimal friction.
  • Particularly effective and advantageous construction solutions reside in accordance with the invention in that the tool holder is mounted either sliding on or air cushion, or rotating in bearings using pivoting arms.
  • the grinding tool comprising the grinding motor 1 and the grinding wheel 2 mounted on the motor shaft, is carried by a tool holder 4 movable on rails 5 or on an equivalent system allowing a linear displacement.
  • the tool holder 4 is connected via connecting rods 6, 6 'to a crank arm 7 which is fixed on the shaft of a constant torque motor 8.
  • This constant torque motor 8 is mounted on a carriage 10 on which the rails 5 are fixed.
  • the constant torque motor 8 presses the grinding wheel 2 with a predetermined force against the edge of a glass sheet 12.
  • the carriage 10 is for its part movable on rails or sliding bars 14, thanks to a motor 38 fixed on a frame 36 and transmitting its movement by means of a toothed belt 39.
  • the grinding tool is positioned using the carriage 10, that is to say it is brought into the desired position, while the tool holder 4 movable on the rails 5 serves to exert the desired pressure with the grinding tool on the edge of the glass sheet 12.
  • a pressure capsule 15 which provides an electrical signal corresponding to the effective grinding pressure.
  • This signal also called actual voltage, is brought to a control amplifier 17 by line 16, while the setpoint voltage corresponding to the set point of the grinding pressure is brought to the control amplifier 17 by the via potentiometer 18.
  • the constant torque motor 8 is activated via line 19 by the regulation amplifier 17 which compares the setpoint voltage and the actual voltage. Since no electromotive force appears on the constant torque motor 8, an equivalent resistance 20 is inserted between the regulation amplifier 17 and the constant torque motor 8.
  • Figure 1 are only shown rails 14 arranged in a single direction of movement. This system can be used as is in the case where the glass sheet is rotated and the carriage 10 carrying the grinding tool moves in one direction to remain in contact with the edge of the glass sheet.
  • FIG. 1 represents only one only direction defined by the rails 14, but the addition of an additional displacement system in a direction perpendicular to the first does not modify the invention. Provision is also made for mounting the assembly ensuring the regulation of the grinding pressure, namely the grinding wheel 2 and its motor 1, the rails 5, the tool holder 4, the motor 8, the connecting rods 6 and 6 ′, the arm crank 7 and the manometric capsule on a rotating disc not shown and adapted to be oriented so as to hold the rails 5 in a direction perpendicular to the edge of the glass sheet.
  • the grinding head can rotate 360 °.
  • FIG. 2 illustrates a system for regulating the grinding pressure controlled by a program, this system fitted to a grinding machine having a movement carriage composed in two orthogonal directions X and Y, which carries the grinding tool and which is guided all around the glass sheet, that is to say on the 360 ° of the periphery of the glass sheet, by a guide program.
  • the grinding pressure regulation circuit minimises the grinding pressure of the tool to modify its path along the edge of the glass sheet, in the sense that it is, for example reduced, when the the tool bypasses the portions of glass sheets having angles.
  • a pre-established and fixed reference voltage or uses different reference voltages which vary according to the position of the grinding tool.
  • the grinding motor 1 is, as described above, mounted on the tool holder 4 which is pressed, by means of the connecting rod 6, the pressure capsule 15 and the connecting rod 6 ', thanks to the constant torque motor 8 , against the edge of the glass sheet.
  • the constant torque motor 8 is activated by the regulation amplifier 17 and between this amplifier and the motor 8 the resistor 20 is interposed.
  • the most important component of the device for the "programming of the route around the whole periphery" is a digital reverse run counter 24.
  • This digital counter 24 has ten preset switches 25.
  • a relay is associated with each switch. preselection 25.
  • the relays are designated by Z 1 to Z10 '
  • the preselection switches 25 of the digital counter 24 make it possible to modify, increase or decrease the grinding pressure at particular points in the path of the grinding tool. These points are advantageously determined empirically.
  • the counter 24 advances through the two pulse generators 26 and 27, the generator 26 being coupled to the carriage drive mechanism in a direction, for example the axis X and the generator 27 being coupled to the drive mechanism in the other direction, for example the Y axis.
  • the counter 24 advances by one notch and the number of pulses appears on the table d display 28
  • the associated relay 2 1 to Z 10 trips and closes the corresponding contact thus establishing a circuit passing through one of the potentiometers P 1 to Pe.
  • the potentiometer P 1 of the grinding pressure setpoint is associated with the contacts of the relays Z i , Z 3 , Z 5 , Z 7 , and Z 3 .
  • the potentiometer P 1 determines the basic grinding pressure, which must for example be exerted on portions straight edges.
  • Each of the other relays Z 2 , Z4, Z 6 , Z 8 and Z 10 is associated with a potentiometer P 2 , P 3 , P 4 , and P 6 corresponding to a different set value.
  • the device operates as follows. At the start of the grinding machine, the pulse generators 26, 27 are rotated and clock the advancement of the digital counter 24.
  • the preset switches 25 allow the relays Z 1 to Z 10 to operate at determined points of the path. Before the first relay Z is actuated, a basic grinding pressure determined by the potentiometer P 1 is exerted. If, at a chosen point in the route, the relay Z 1 switches, a switchover to the circuit containing the potentiometer P 2 occurs. When another point in the path of the grinding tool set on the next preset switch is reached, the relay Z 2 is actuated in turn, which has the effect of switching off the potentiometer P 2 and by switching back to potentiometer P i .
  • the contact d 2 is naturally closed when the machine is started and the latter remains closed until the entire periphery to be ground has been covered.
  • the contact d 2 is open and the contact d 3 is closed.
  • Closing the contact d3 has the effect of activating the servo-amplifier 17 by the set value set by the potentiometer Po, with the consequence that the carriage 10 (FIG. 1) carrying the tool holder 4 is returned to its position of departure.
  • the contact d 1 which erases the digital counter 24, is closed in turn.
  • FIG. 3 A first embodiment allowing the tool holder 4 to rotate with little friction is illustrated in FIG. 3.
  • the tool holder 4 has the form of a plate with polished surfaces, on which is fixed a bearing 30 which carries the grinding unit formed by the motor 1 and the grinding wheel 2.
  • the constant torque motor 8 acts on the plate 4 by means of the pressure capsule 15 and the crank arm 7.
  • the plate 4 is guided between a plate lower support 31 and an upper support plate 32 which for their part are supported on their two sides by closure plates 33.
  • the set of plates 31, 32, 33 constitutes the carriage 10 which can be moved the along the bars 14 by means of lateral ball bearing bushings 34.
  • the bars 14 are mounted using the yokes 35 on the frame 36 of the machine.
  • This frame 36 also carries the positioning motor 38 which, by means of the toothed belt 39, moves the carriage 10 according to a program recorded in the direction of the arrow double F, so that the grinding wheel 2 is always guided in the position which, upon rotation of the glass sheet 12, is pre-established and determined by the shape of this glass sheet.
  • the constant torque motor 8 which acts via the crank arm 7 on the plate 4 and which determines the pressure force with which the grinding wheel is pressed against the edge of the glass sheet.
  • the air cushion between the plate 4 and the upper plate 32 is necessary to compensate for the forces which result from the pressure exerted by the grinding wheel placed below the plate 4 on the edge of the glass sheet.
  • the plate 4 is mounted so as to also have little friction on its sides and on its ends.
  • Rolling balls 45 mounted additionally in the plates 31, 32 are arranged opposite each face of the plate 4 at a height such that the plate 4 does not come into contact with them when the air cushions are present.
  • the rolling balls 45 therefore only fulfill an emergency function and in all cases avoid the friction of the plate 4 against the plates 31 and 32.
  • FIG. 4 illustrates another embodiment making it possible to obtain low friction of the tool holder.
  • the tool holder comprises a plate 54 mounted oscillating on two pivoting arms 55.
  • the pivoting arms 55 are articulated at one end on pivoting yokes 56 provided on a console 57.
  • the console 57 is for its part fixed to the carriage , here referenced 58, which can be moved by sliding on the sliding bars 14 already present in the previous embodiment.
  • the constant torque motor 8, fixed on a support 60 belonging to the carriage 58 acts on the carriage 54 via the crank arm 7 and the pressure capsule 15.
  • the pivoting arms 55 are articulated on the plate 54 by means of pivoting yokes 62.
  • the pivoting yokes 56 and 62 include low friction ball bearings. This oscillating arrangement certainly does not allow a strictly linear movement of the plate 54, but this is of no importance for the present case in which there is simply a regulation of the grinding pressure during which the distances traveled are very small.
  • the motor 38, the frame element 36 and the toothed belt 39, are those already described in FIG. 1.

Claims (10)

1. Vorrichtung zum Schleifen der Kanten von Glasscheiben (12) mit Hilfe eines Schleifwerkzeugs (1, 2), das auf einem senkrecht zur Glasscheibenkante verfahrbaren Werkzeugträgers (4) angeordnet ist, auf welchen eine Andrückvorrich- tung (6-8) einwirkt, durch die das Schleifwerkzeug mit einer regelbaren Kraft gegen die Glasscheibenkante angedrückt wird, dadurch gekennzeichnet, daß die Andrückvorrichtung einen elektrischen Drehmomentmotor (8) umfaßt, der über einen Kurbelarm (7) an den Werkzeugträger (4) angelenkt ist, wobei der von dem Drehmomentmotor (8) ausgeübte Druck unter Zwischenschaltung einer Druckmeßdose (15) auf den Werkzeugträger (4) übertragen wird und das elektrische Ausgangssignal der Druckmeßdose als Istwert des Schleifdrucks einem Regelverstärker (17) zugeführt wird, der den Drehmomentmotor (8) steuert.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß dem Regelverstärker (17) eine den Schleifdruck bestimmende regelbare Sollwertspannung zugeführt wird.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die dem Regelverstärker (17) zugeführte Sollwertspannung nach einem vorgegebenen Programm veränderbar ist.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß sie eine Reihe von Regelpotentiometern für die Sollwertspannung umfaßt, die durch auf einem Informationsträger gespeicherte Signale an ausgewählten Stellen entlang des Umfangs der Glasscheibe ein- oder abgeschaltet werden.
5. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß sie eine Reihe von Regelpotentiometern (P, ... P6) für die Sollwertspannung umfaßt, die von einer Reihe von Vorwählschaltern (25) zugeordneten Relais (Z, ... Zio) in der vorprogrammierten Reihenfolge der Vorwählschalter (25) betätigt werden, wobei die Vorwählschalter (25) von Impulsgebern (26, 27) betätigt werden, die den Weg des Schleifwerkzeugs in der oder in den Bewegungsrichtungen wiedergeben.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der von dem Drehmomentmotor (8) betätigte und das Schleifwerkzeug (1, 2) tragende Werkzeugträger (4) auf eine sehr reibungsarme Art gelagert ist.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß der Werkzeugträger (4) in Form einer Platte auf einem Luftkissen gelagert ist.
8. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß der Werkzeugträger (54) an Schwenkarmen (55) gelagert ist.
9. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß sie Teil einer programmgesteuerten Schleifmaschine mit einem in zwei rechtwinklig zueinander verlaufenden Richtungen X und Y verfahrbaren und einen Werkzeugträger tragenden Wagen ist, wobei der Werkzeugträger einen während des Umlaufs um die Glasscheibe sich um 360 Gad drehenden Schleifkopf umfaßt.
10. Vorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß sie Teil einer Schleifmaschine ist, deren das Schleifwerkzeug tragender Wagen auf einem linear auf die Glasscheibe gerichteten Weg programmgesteuert ist, wobei die Stellung des Wagens auf dem linearen Weg von der Winkelstellung der in Drehung versetzten Glasscheibe abhängt.
EP83400129A 1982-01-20 1983-01-19 Apparat zum Schleifen von Glaskanten Expired EP0084504B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3201495 1982-01-20
DE3201494 1982-01-20
DE3201495 1982-01-20
DE3201494 1982-01-20

Publications (3)

Publication Number Publication Date
EP0084504A2 EP0084504A2 (de) 1983-07-27
EP0084504A3 EP0084504A3 (en) 1984-12-27
EP0084504B1 true EP0084504B1 (de) 1988-05-18

Family

ID=25798955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400129A Expired EP0084504B1 (de) 1982-01-20 1983-01-19 Apparat zum Schleifen von Glaskanten

Country Status (4)

Country Link
EP (1) EP0084504B1 (de)
DE (1) DE3376631D1 (de)
ES (1) ES519114A0 (de)
PT (1) PT76124A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2554375B1 (fr) * 1983-11-09 1987-09-25 Saint Gobain Vitrage Maintien de feuilles de verre par electro-aimant
DE3424258C2 (de) * 1984-06-30 1986-12-11 VEGLA Vereinigte Glaswerke GmbH, 5100 Aachen Maschine zum Kantenschleifen von Glasscheiben
US4638601A (en) * 1985-11-04 1987-01-27 Silicon Technology Corporation Automatic edge grinder
IT1190474B (it) * 1986-03-04 1988-02-16 Siv Soc Italiana Vetro Macchina perfezionata per la molatura del bordo di lastre di vetro,particolarmente vetrature per automobili

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1588348A (de) * 1968-10-14 1970-04-10

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803772A (en) * 1970-08-14 1974-04-16 Cincinnati Milacron Heald Grinding machine
JPS5089777A (de) * 1973-12-18 1975-07-18
BE837728A (fr) * 1976-01-20 1976-05-14 Machine a faconner les bords de feuilles planes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1588348A (de) * 1968-10-14 1970-04-10

Also Published As

Publication number Publication date
EP0084504A3 (en) 1984-12-27
ES8400043A1 (es) 1983-11-01
ES519114A0 (es) 1983-11-01
PT76124A (fr) 1983-02-01
DE3376631D1 (en) 1988-06-23
EP0084504A2 (de) 1983-07-27

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