US20100180638A1 - System for positioning glass sheets for forming - Google Patents
System for positioning glass sheets for forming Download PDFInfo
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- US20100180638A1 US20100180638A1 US12/749,808 US74980810A US2010180638A1 US 20100180638 A1 US20100180638 A1 US 20100180638A1 US 74980810 A US74980810 A US 74980810A US 2010180638 A1 US2010180638 A1 US 2010180638A1
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- Prior art keywords
- glass sheet
- forming
- conveyor
- mold
- conveyance
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/035—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending
- C03B23/0352—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet
- C03B23/0357—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet by suction without blowing, e.g. with vacuum or by venturi effect
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
- C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
- C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
- C03B35/22—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands on a fluid support bed, e.g. on molten metal
- C03B35/24—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands on a fluid support bed, e.g. on molten metal on a gas support bed
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2225/00—Transporting hot glass sheets during their manufacture
- C03B2225/02—Means for positioning, aligning or orientating the sheets during their travel, e.g. stops
Definitions
- This invention relates to a system for positioning glass sheets for forming.
- Glass sheets are conventionally formed by heating on a conveyor within a furnace and then forming prior to delivery for cooling. Such cooling can be slow cooling to provide annealing or faster cooling that provides heat strengthening or tempering.
- Such cooling can be slow cooling to provide annealing or faster cooling that provides heat strengthening or tempering.
- U.S. Pat. Nos. 3,806,312 McMaster et al.; 3,947,242 McMaster et al.; 3,994,711 McMaster; 4,404,011 McMaster; and 4,512,460 McMaster In connection with glass sheet forming, see U.S. Pat. Nos.
- Vehicle windshields are conventionally manufactured from outer and inner formed glass sheets and an intermediate layer of polyvinyl butyral.
- the outer and inner glass sheets have different sizes since the outwardly curved shape of the formed windshield necessitates that the outer glass sheet be slightly greater in size than the inner glass sheet. Also, upon manufacturing, there can be slight variations in the size of flat glass prior to the forming.
- switches which have previously been utilized to sense the approach of a glass sheet to initiate transfer from a conveyor for forming do not necessarily initiate transfer that positions the glass centrally on a forming mold for the forming.
- An object of the present invention is to provide an improved glass sheet forming system.
- the glass sheet forming system of the invention includes a conveyor for conveying a heated glass sheet in a horizontally plane of conveyance along a direction of conveyance.
- the forming system has a forming station to which the conveyor conveys the heated glass sheet, and the forming station has a forming mold including a downwardly facing curved forming face that is positioned above the plane of conveyance and has a forming portion for forming a glass sheet of a predetermined size.
- a detection system measures the spacing along the direction of conveyance between downstream and upstream extremities of the conveyed glass sheet
- a controller of the forming system coordinates the conveyor and the detection system to convey the glass sheet to a central position below the forming portion of the mold
- transfer apparatus of the forming system transfers the centrally positioned glass sheet from the conveyor to the forming mold for forming of the glass sheet against the forming face.
- the detection system includes a single detector that initially detects the downstream extremity of the conveyed glass sheet and subsequently detects the upstream extremity of the conveyed glass sheet to generate a control signal corresponding to the size of the glass sheet, and the controller processes the control signal in coordination with the conveyor detection system to convey the glass sheet to the central position for the transfer to the mold forming face without stopping the conveyance prior to the transfer.
- the transfer apparatus may be: a lifter including a continuous ring for lifting the glass sheet upwardly from the conveyor to the forming mold; a lifter including a segmented ring for lifting the glass sheet upwardly from the conveyor to the forming mold; a vacuum supply for drawing a vacuum at the curved forming face of the forming mold; a control for moving the forming mold downwardly toward the conveyor; a gas supply for blowing gas upwardly from below the glass sheet to lift the glass sheet upwardly from the conveyor; and any combination of two or more of the continuous ring lifter, the segmented ring lifter, the vacuum supply, the forming mold control and the gas supply.
- the glass sheet forming system disclosed also includes a lateral positioner that laterally positions the glass sheet on the conveyor at a central lateral position, and the forming system also includes a furnace to which the glass sheet is conveyed after the lateral position for heating prior to the conveyance to the central position below the forming mold for the transfer to its forming face.
- FIG. 1 is a side elevational view of a glass sheet forming system constructed in accordance with the invention to position glass sheets for forming.
- FIGS. 2 a and 2 b illustrate a detector of a detection system for respectively detecting downstream and upstream extremities of a conveyed glass sheet in preparation for forming.
- FIGS. 3 a and 3 b respectively illustrate the manner in which larger and smaller glass sheets are centrally positioned on a forming face of a curved forming mold to provide forming to a design shape.
- FIG. 4 is a top plan view taken along the direction of line 4 - 4 in FIG. 1 to illustrate transfer apparatus embodied as a lifter including a continuous ring.
- FIG. 5 is a view taken in the same direction as FIG. 4 illustrating another embodiment of the transfer apparatus lifter which is a segmented ring.
- FIG. 6 is a partial side elevational view similar to FIG. 1 illustrating the system forming station wherein the transfer apparatus includes lift jets for blowing air upwardly from below the conveyor.
- a glass sheet forming system is generally indicated by 10 and includes a loading station 12 for loading glass sheets G, a furnace 14 for heating the glass sheets, a forming station 16 for forming the glass sheets, and a quench station 18 for cooling the glass sheets for slow cooling to provide annealing although it is also possible to provide faster cooling for tempering or heat strengthening when required by the application of the particular type of glass sheet being processed.
- a conveyor 20 of the forming system is illustrated as being of the roll type including rolls 22 that convey the glass sheets for heating in the furnace 24 and for movement into the forming station 26 for the forming.
- the conveyor rolls 22 support each glass sheet G in a horizontal plane of conveyance for movement along a direction of conveyance as shown by arrow C. It is also possible to convey the glass sheets on other types of conveyors, such as on air hearth conveyors in which case the horizontal plane of conveyance normally will be slightly tilted in a lateral direction transverse to the direction of conveyance.
- each glass sheet is loaded either manually or by automated apparatus such as one or more robots for conveyance on the rolls 22 of conveyor 20 .
- a lateral positioner 24 of the loading station laterally positions each loaded glass sheet G with respect to the direction of conveyance so as to be in the proper location upon ultimately reaching the forming station 16 after passage through a heating chamber 26 of the furnace 14 for heating to a forming temperature in any conventional manner.
- the forming station 16 as shown in FIG. 1 includes a housing 28 that defines a heating chamber 30 in which a forming mold 32 is located.
- This heated chamber 30 as disclosed is not as hot as the heating chamber 26 of furnace 14 , more specifically, the furnace heating chamber will normally be on the order of 600-680° C. in different locations, while the heating chamber 30 where the forming mold 32 is located will be about 500° C.
- the forming mold 32 is located above the rolls 22 of the conveyor 20 and has a downwardly oriented forming face 34 of a curved shape. This forming face has a forming portion for forming a glass sheet of a predetermined size. More specifically, as shown in FIGS.
- the forming portion of forming face 34 has a central location CL along the direction of conveyance C.
- a glass sheet of the predetermined size when centrally positioned on the conveyor, or on the forming face 34 as is hereinafter described, will have the midpoint between its downstream and upstream extremities along the direction of conveyance located at the forming face central location CL.
- a controller 36 of the forming system through a connection 38 operates a schematically indicated drive 40 of the conveyor 20 .
- a detection system 42 of the system includes a detector 44 located upstream from the forming mold 32 and having a connection 46 to the controller 36 .
- the detector 44 propagates a detection beam 48 that initially detects a downstream extremity 50 of the conveyed glass sheet. Thereafter as shown in FIG. 2 b , the detector 44 detects an upstream extremity of the conveyed glass sheet such that the controller 36 can measure the spacing or distance between these upstream and downstream extremities and any difference either larger or smaller than the glass sheet of the predetermined size. Furthermore, the subsequent detection of the upstream extremity through the coordination of the controller 36 in driving the conveyor 20 provides an indication of the location of the conveyed glass sheet so a control signal can be generated such that the glass sheet is moved to the central position below the forming face 34 of the forming mold 32 as shown by phantom line representation in FIGS. 3 a and 3 b .
- each centrally positioned glass sheet G regardless of its spacing between its downstream and upstream extremities 50 and 52 will have the same distance downstream and upstream from the central location CL so that the forming of the glass sheet will be to the design shape despite any difference in the glass sheet sizes. It should be appreciated that other types of detectors can be used in addition to the beam propagating detector shown.
- the forming station 16 includes transfer apparatus collectively indicated by 54 for performing upward transfer of the glass sheet from the central position on the conveyor 20 upwardly to the central position on the forming mold 32 as shown in FIGS. 3 a and 3 b and described above.
- the controller 36 shown in FIG. 1 slows the conveyor to decelerate the glass sheet.
- the transfer apparatus 54 Upon reaching the central position shown in FIGS. 3 a and 3 b but before termination of the conveyance, the transfer apparatus 54 begins the upward transfer of the glass sheet to the forming face 34 of the forming mold 32 at the central position for the forming.
- Transfer apparatus 54 as shown in FIG. 1 includes a lifter 56 that is moved vertically by an actuator 58 having a connection 60 to the controller 36 .
- This lifter 56 as illustrated in FIG. 4 may be a continuous ring 60 that moves upwardly from below disc shaped wheel rolls 22 in a manner more fully disclosed by U.S. Pat. No. 6,543,255, the entire disclosure of which is hereby incorporated by reference.
- the lifter 56 may be embodied by a segmented ring 62 whose portion 64 move upwardly between elongated conveyor rolls 22 to provide the lifting.
- the transfer apparatus 54 as disclosed also includes a vacuum supply 66 that draws a vacuum through a conduit 68 at openings in the forming face 34 of the forming mold 32 under the operation through a connection 70 to the controller 36 .
- this vacuum supply 66 may have an initial greater vacuum that is provided by a vacuum impulse and subsequently is reduced to prevent deformation of the heated glass sheet at the forming face openings through which the vacuum is drawn. It is also possible to subsequently supply positive pressure air to the forming face openings to provide release of the glass sheet for delivery and subsequent cooling as is hereinafter more fully described.
- the transfer apparatus 54 shown in FIG. 1 also includes a vertical control or actuator 72 having a connection 74 to the forming mold 32 to provide vertical movement thereof between the solid indicated upper position and the phantom line indicated lower position under the control of a connection 76 to the controller 36 .
- the transfer apparatus 54 can also be constructed to include a gas supply 78 that feeds gas from a pressurized source 80 through a valve 82 operated by a connection 84 to the controller 36 to blow gas upwardly through an array 86 of lift jet nozzles 88 . More specifically, the upwardly blown air passes between the conveyor rolls 22 to actuate the lifting.
- the forming system 10 has particular utility when utilized to manufacture vehicle windshields which include outer and inner glass sheets that are of a slightly different size than each other. More specifically, the curved shape of the formed windshield results in the outer glass sheets being slightly larger than the inner glass sheets. However, since the glass sheets are centrally positioned along the direction of conveyance shown by arrow C with respect to the center location CL, both the inner and outer glass sheets are formed at the same forming portion of the forming face 34 of the forming mold 32 so as not to have different curvatures than each other. During the manufacturing, the larger outer glass sheets and the smaller inner glass sheets are alternately loaded on the conveyor 20 at the locating station 12 and ultimately heated in the furnace and processed for forming at the forming station 16 as described above.
- the cooling station 18 receives the formed glass sheet by a cooling mold 90 operated by delivery apparatus 92 having an actuator 94 from which a connection 96 extends to the mold and with a control connection 98 extending from the actuator to the controller 36 to provide the operation in coordination with the rest of the forming station.
- cooling station 18 can also be of the quenching station type for providing rapid cooling that tempers or heat strengthens the formed glass sheet in other applications.
Abstract
A forming system (10) having particular utility for making outer and inner formed windshield glass sheets provides glass sheet positioning centrally on a forming face (34) of a forming mold (32) to form each glass sheet to a design shape regardless of any size difference between the glass sheets from one cycle to the next.
Description
- This application is a divisional of U.S. patent application Ser. No. 11/696,209 filed on Apr. 4, 2007 by Terry A. Bennett and Steven M. Connell under the title METHOD AND SYSTEM FOR POSITIONING GLASS SHEETS FOR FORMING.
- 1. Field of the Invention
- This invention relates to a system for positioning glass sheets for forming.
- 2. Background Art
- Glass sheets are conventionally formed by heating on a conveyor within a furnace and then forming prior to delivery for cooling. Such cooling can be slow cooling to provide annealing or faster cooling that provides heat strengthening or tempering. In connection with heating of the glass sheets, see U.S. Pat. Nos. 3,806,312 McMaster et al.; 3,947,242 McMaster et al.; 3,994,711 McMaster; 4,404,011 McMaster; and 4,512,460 McMaster. In connection with glass sheet forming, see U.S. Pat. Nos. 4,204,854 McMaster et al.; 4,222,763 McMaster; 4,282,026 McMaster et al.; 4,437,871 McMaster et al.; 4,575,390 McMaster; 4,661,141 Nitschke et al.; 4,662,925 Thimons et al.; 5,004,491 McMaster et al.; 5,330,550 Kuster et al.; 5,376,158 Shetterly et al.; 5,472,470 Kormanyos et al.; 5,900,034 Mumford et al.; 5,906,668 Mumford et al.; 5,925,162 Nitschke et al.; 6,032,491 Nitschke et al.; 6,173,587 Mumford et al.; 6,227,008 Shetterly; 6,418,754 Nitschke et al.; 6,543,255 Bennett et al.; 6,578,383 Bennett et al.; 6,718,798 Nitschke et al.; 6,729,160 Nitschke et al. In connection with the cooling, see U.S. Pat. Nos. 3,936,291 McMaster; 4,470,838 McMaster et al.; 4,525,193 McMaster et al.; 4,946,491 Barr; 5,385,786 Shetterly et al.; 5,917,107 Ducat et al.; 6,079,094 Ducat et al.; and 6,513,348 Bennett et al.
- Vehicle windshields are conventionally manufactured from outer and inner formed glass sheets and an intermediate layer of polyvinyl butyral. The outer and inner glass sheets have different sizes since the outwardly curved shape of the formed windshield necessitates that the outer glass sheet be slightly greater in size than the inner glass sheet. Also, upon manufacturing, there can be slight variations in the size of flat glass prior to the forming. Thus, switches which have previously been utilized to sense the approach of a glass sheet to initiate transfer from a conveyor for forming do not necessarily initiate transfer that positions the glass centrally on a forming mold for the forming.
- An object of the present invention is to provide an improved glass sheet forming system.
- In carrying out the above object, the glass sheet forming system of the invention includes a conveyor for conveying a heated glass sheet in a horizontally plane of conveyance along a direction of conveyance. the forming system has a forming station to which the conveyor conveys the heated glass sheet, and the forming station has a forming mold including a downwardly facing curved forming face that is positioned above the plane of conveyance and has a forming portion for forming a glass sheet of a predetermined size. A detection system measures the spacing along the direction of conveyance between downstream and upstream extremities of the conveyed glass sheet, a controller of the forming system coordinates the conveyor and the detection system to convey the glass sheet to a central position below the forming portion of the mold, and transfer apparatus of the forming system transfers the centrally positioned glass sheet from the conveyor to the forming mold for forming of the glass sheet against the forming face.
- As disclosed, the detection system includes a single detector that initially detects the downstream extremity of the conveyed glass sheet and subsequently detects the upstream extremity of the conveyed glass sheet to generate a control signal corresponding to the size of the glass sheet, and the controller processes the control signal in coordination with the conveyor detection system to convey the glass sheet to the central position for the transfer to the mold forming face without stopping the conveyance prior to the transfer.
- As disclosed, the transfer apparatus may be: a lifter including a continuous ring for lifting the glass sheet upwardly from the conveyor to the forming mold; a lifter including a segmented ring for lifting the glass sheet upwardly from the conveyor to the forming mold; a vacuum supply for drawing a vacuum at the curved forming face of the forming mold; a control for moving the forming mold downwardly toward the conveyor; a gas supply for blowing gas upwardly from below the glass sheet to lift the glass sheet upwardly from the conveyor; and any combination of two or more of the continuous ring lifter, the segmented ring lifter, the vacuum supply, the forming mold control and the gas supply.
- The glass sheet forming system disclosed also includes a lateral positioner that laterally positions the glass sheet on the conveyor at a central lateral position, and the forming system also includes a furnace to which the glass sheet is conveyed after the lateral position for heating prior to the conveyance to the central position below the forming mold for the transfer to its forming face.
- The objects, features and advantages of the present invention are readily apparent from the following detailed description of the preferred embodiments when taken in connection with the accompanying drawings.
-
FIG. 1 is a side elevational view of a glass sheet forming system constructed in accordance with the invention to position glass sheets for forming. -
FIGS. 2 a and 2 b illustrate a detector of a detection system for respectively detecting downstream and upstream extremities of a conveyed glass sheet in preparation for forming. -
FIGS. 3 a and 3 b respectively illustrate the manner in which larger and smaller glass sheets are centrally positioned on a forming face of a curved forming mold to provide forming to a design shape. -
FIG. 4 is a top plan view taken along the direction of line 4-4 inFIG. 1 to illustrate transfer apparatus embodied as a lifter including a continuous ring. -
FIG. 5 is a view taken in the same direction asFIG. 4 illustrating another embodiment of the transfer apparatus lifter which is a segmented ring. -
FIG. 6 is a partial side elevational view similar toFIG. 1 illustrating the system forming station wherein the transfer apparatus includes lift jets for blowing air upwardly from below the conveyor. - With reference to
FIG. 1 , a glass sheet forming system is generally indicated by 10 and includes aloading station 12 for loading glass sheets G, afurnace 14 for heating the glass sheets, a formingstation 16 for forming the glass sheets, and aquench station 18 for cooling the glass sheets for slow cooling to provide annealing although it is also possible to provide faster cooling for tempering or heat strengthening when required by the application of the particular type of glass sheet being processed. - With continuing reference to
FIG. 1 , aconveyor 20 of the forming system is illustrated as being of the rolltype including rolls 22 that convey the glass sheets for heating in thefurnace 24 and for movement into the formingstation 26 for the forming. Theconveyor rolls 22 support each glass sheet G in a horizontal plane of conveyance for movement along a direction of conveyance as shown by arrow C. It is also possible to convey the glass sheets on other types of conveyors, such as on air hearth conveyors in which case the horizontal plane of conveyance normally will be slightly tilted in a lateral direction transverse to the direction of conveyance. - At the
loading station 12 each glass sheet is loaded either manually or by automated apparatus such as one or more robots for conveyance on therolls 22 ofconveyor 20. Alateral positioner 24 of the loading station laterally positions each loaded glass sheet G with respect to the direction of conveyance so as to be in the proper location upon ultimately reaching the formingstation 16 after passage through aheating chamber 26 of thefurnace 14 for heating to a forming temperature in any conventional manner. - The forming
station 16 as shown inFIG. 1 includes ahousing 28 that defines aheating chamber 30 in which a formingmold 32 is located. Thisheated chamber 30 as disclosed is not as hot as theheating chamber 26 offurnace 14, more specifically, the furnace heating chamber will normally be on the order of 600-680° C. in different locations, while theheating chamber 30 where the formingmold 32 is located will be about 500° C. The formingmold 32 is located above therolls 22 of theconveyor 20 and has a downwardly oriented formingface 34 of a curved shape. This forming face has a forming portion for forming a glass sheet of a predetermined size. More specifically, as shown inFIGS. 3 a and 3 b, the forming portion of formingface 34 has a central location CL along the direction of conveyance C. A glass sheet of the predetermined size when centrally positioned on the conveyor, or on the formingface 34 as is hereinafter described, will have the midpoint between its downstream and upstream extremities along the direction of conveyance located at the forming face central location CL. - A
controller 36 of the forming system through aconnection 38 operates a schematically indicateddrive 40 of theconveyor 20. Furthermore, adetection system 42 of the system includes adetector 44 located upstream from the formingmold 32 and having aconnection 46 to thecontroller 36. - As shown in
FIG. 2 a, thedetector 44 propagates adetection beam 48 that initially detects adownstream extremity 50 of the conveyed glass sheet. Thereafter as shown inFIG. 2 b, thedetector 44 detects an upstream extremity of the conveyed glass sheet such that thecontroller 36 can measure the spacing or distance between these upstream and downstream extremities and any difference either larger or smaller than the glass sheet of the predetermined size. Furthermore, the subsequent detection of the upstream extremity through the coordination of thecontroller 36 in driving theconveyor 20 provides an indication of the location of the conveyed glass sheet so a control signal can be generated such that the glass sheet is moved to the central position below the formingface 34 of the formingmold 32 as shown by phantom line representation inFIGS. 3 a and 3 b. More specifically, each centrally positioned glass sheet G regardless of its spacing between its downstream andupstream extremities - As illustrated in
FIG. 1 , the formingstation 16 includes transfer apparatus collectively indicated by 54 for performing upward transfer of the glass sheet from the central position on theconveyor 20 upwardly to the central position on the formingmold 32 as shown inFIGS. 3 a and 3 b and described above. Just prior to the conveyed glass sheet G reaching the central position on theconveyor 20, thecontroller 36 shown inFIG. 1 slows the conveyor to decelerate the glass sheet. Upon reaching the central position shown inFIGS. 3 a and 3 b but before termination of the conveyance, thetransfer apparatus 54 begins the upward transfer of the glass sheet to the formingface 34 of the formingmold 32 at the central position for the forming. -
Transfer apparatus 54 as shown inFIG. 1 includes alifter 56 that is moved vertically by anactuator 58 having aconnection 60 to thecontroller 36. Thislifter 56 as illustrated inFIG. 4 may be acontinuous ring 60 that moves upwardly from below discshaped wheel rolls 22 in a manner more fully disclosed by U.S. Pat. No. 6,543,255, the entire disclosure of which is hereby incorporated by reference. In addition as shown inFIG. 5 , thelifter 56 may be embodied by a segmentedring 62 whoseportion 64 move upwardly betweenelongated conveyor rolls 22 to provide the lifting. - With reference back to
FIG. 1 , thetransfer apparatus 54 as disclosed also includes avacuum supply 66 that draws a vacuum through aconduit 68 at openings in the formingface 34 of the formingmold 32 under the operation through aconnection 70 to thecontroller 36. It should be noted that thisvacuum supply 66 may have an initial greater vacuum that is provided by a vacuum impulse and subsequently is reduced to prevent deformation of the heated glass sheet at the forming face openings through which the vacuum is drawn. It is also possible to subsequently supply positive pressure air to the forming face openings to provide release of the glass sheet for delivery and subsequent cooling as is hereinafter more fully described. - The
transfer apparatus 54 shown inFIG. 1 also includes a vertical control oractuator 72 having aconnection 74 to the formingmold 32 to provide vertical movement thereof between the solid indicated upper position and the phantom line indicated lower position under the control of aconnection 76 to thecontroller 36. - As shown in
FIG. 6 , thetransfer apparatus 54 can also be constructed to include agas supply 78 that feeds gas from apressurized source 80 through avalve 82 operated by aconnection 84 to thecontroller 36 to blow gas upwardly through anarray 86 oflift jet nozzles 88. More specifically, the upwardly blown air passes between the conveyor rolls 22 to actuate the lifting. - The forming
system 10 has particular utility when utilized to manufacture vehicle windshields which include outer and inner glass sheets that are of a slightly different size than each other. More specifically, the curved shape of the formed windshield results in the outer glass sheets being slightly larger than the inner glass sheets. However, since the glass sheets are centrally positioned along the direction of conveyance shown by arrow C with respect to the center location CL, both the inner and outer glass sheets are formed at the same forming portion of the formingface 34 of the formingmold 32 so as not to have different curvatures than each other. During the manufacturing, the larger outer glass sheets and the smaller inner glass sheets are alternately loaded on theconveyor 20 at the locatingstation 12 and ultimately heated in the furnace and processed for forming at the formingstation 16 as described above. - After each glass sheet is formed as illustrated in
FIG. 1 , thecooling station 18 receives the formed glass sheet by a coolingmold 90 operated bydelivery apparatus 92 having an actuator 94 from which aconnection 96 extends to the mold and with acontrol connection 98 extending from the actuator to thecontroller 36 to provide the operation in coordination with the rest of the forming station. - It should be appreciated that the
cooling station 18 can also be of the quenching station type for providing rapid cooling that tempers or heat strengthens the formed glass sheet in other applications. - While different modes of the invention have been illustrated and described, it is not intended that these modes illustrate and describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention.
Claims (6)
1. A glass sheet forming system comprising:
a conveyor for conveying a heated glass sheet in a horizontally plane of conveyance along a direction of conveyance;
a forming station to which the conveyor conveys the heated glass sheet;
the forming station having a forming mold including a downwardly facing curved forming face that is positioned above the plane of conveyance and has a forming portion for forming a glass sheet of a predetermined size;
a detection system for measuring the spacing along the direction of conveyance between downstream and upstream extremities of the conveyed glass sheet;
a controller that coordinates the conveyor and the detection system to convey the glass sheet to a central position below the forming portion of the mold; and
transfer apparatus for transferring the centrally positioned glass sheet from the conveyor to the forming mold for forming of the glass sheet against the forming face.
2. A glass sheet forming system as in claim 1 wherein the detection system includes a single detector that initially detects the downstream extremity of the conveyed glass sheet and subsequently detects the upstream extremity of the conveyed glass sheet to generate a control signal corresponding to the size of the glass sheet, and the controller processing the control signal in coordination with the conveyor detection system to convey the glass sheet to the central position for the transfer to the mold forming face without stopping the conveyance prior to the transfer.
3. A glass sheet forming system as in claim 1 wherein the transfer apparatus is selected from the group consisting of: a lifter including a continuous ring for lifting the glass sheet upwardly from the conveyor to the forming mold; a lifter including a segmented ring for lifting the glass sheet upwardly from the conveyor to the forming mold; a vacuum supply for drawing a vacuum at the curved forming face of the forming mold; a control for moving the forming mold downwardly toward the conveyor; a gas supply for blowing gas upwardly from below the glass sheet to lift the glass sheet upwardly from the conveyor; and any combination of two or more of the continuous ring lifter, the segmented ring lifter, the vacuum supply, the mold control and the gas supply.
4. A glass sheet forming system as in claim 1 which includes a lateral positioner that laterally positions the glass sheet on the conveyor at a central lateral position.
5. A glass sheet forming station as in claim 4 further including a furnace to which the glass sheet is conveyed after the lateral position for heating prior to the conveyance to the central position below the forming mold for the transfer to its forming face.
6. A glass sheet forming system for forming larger outer glass sheets and smaller inner glass sheets in an alternate manner, the system comprising:
a conveyor for conveying a heated glass sheet in a horizontally plane of conveyance along a direction of conveyance;
a loading station at which the outer glass sheets and the inner glass sheets are alternately loaded onto the conveyor;
a lateral positioner that initially laterally positions each glass sheet on the conveyor at a central lateral location;
a furnace to which the conveyor conveys the glass sheets for heating;
a forming station to which the conveyor conveys the heated glass sheet from the furnace;
the forming station having a forming mold including a downwardly facing curved forming face of a design shape that is positioned above the plane of conveyance and has a forming portion for forming a glass sheet of a predetermined size;
a detection system including a detector for initially detecting a downstream extremity of the conveyed glass sheet and for subsequently detecting an upstream extremity of the conveyed glass sheet to measure the spacing of the glass sheet along the direction of conveyance between its downstream and upstream extremities, and the subsequent detection by the detector of the upstream extremity of the conveyed glass sheet generating a control signal;
a controller that controls the conveyor in response to the control signal of the detection system to convey the glass sheet to a central position below the forming portion of the forming mold; and
transfer apparatus for transferring the centrally positioned glass sheet from the conveyor to the forming mold for forming of the glass sheet against the forming face, and the transfer apparatus being selected from the group consisting of: a lifter including a continuous ring for lifting the glass sheet upwardly from the conveyor to the forming mold; a lifter including a segmented ring for lifting the glass sheet upwardly from the conveyor to the forming mold; a vacuum supply for drawing a vacuum at the curved forming face of the forming mold; a control for moving the forming mold downwardly toward the conveyor; a gas supply for blowing gas upwardly from below the glass sheet to lift the glass sheet upwardly from the conveyor; and any combination of two or more of the continuous ring lifter, the segmented ring lifter, the vacuum supply, the forming mold control and the gas supply.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/749,808 US20100180638A1 (en) | 2007-04-04 | 2010-03-30 | System for positioning glass sheets for forming |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US11/696,209 US7716949B2 (en) | 2007-04-04 | 2007-04-04 | Method for positioning glass sheets for forming |
US12/749,808 US20100180638A1 (en) | 2007-04-04 | 2010-03-30 | System for positioning glass sheets for forming |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/696,209 Division US7716949B2 (en) | 2007-04-04 | 2007-04-04 | Method for positioning glass sheets for forming |
Publications (1)
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US20100180638A1 true US20100180638A1 (en) | 2010-07-22 |
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US11/696,209 Active 2028-03-19 US7716949B2 (en) | 2007-04-04 | 2007-04-04 | Method for positioning glass sheets for forming |
US12/749,808 Abandoned US20100180638A1 (en) | 2007-04-04 | 2010-03-30 | System for positioning glass sheets for forming |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US11/696,209 Active 2028-03-19 US7716949B2 (en) | 2007-04-04 | 2007-04-04 | Method for positioning glass sheets for forming |
Country Status (5)
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US (2) | US7716949B2 (en) |
EP (1) | EP2142483A4 (en) |
JP (1) | JP5292577B2 (en) |
CN (1) | CN101801865B (en) |
WO (1) | WO2008124258A1 (en) |
Cited By (1)
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US9595398B2 (en) | 2013-08-30 | 2017-03-14 | Corning Incorporated | Low resistance ultracapacitor electrode and manufacturing method thereof |
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KR101353525B1 (en) * | 2010-02-09 | 2014-01-21 | 주식회사 엘지화학 | Lay-out for system of manufacturing glass, method for handling glass and glass therefrom |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9595398B2 (en) | 2013-08-30 | 2017-03-14 | Corning Incorporated | Low resistance ultracapacitor electrode and manufacturing method thereof |
US9941059B2 (en) | 2013-08-30 | 2018-04-10 | Corning Incorporated | Low resistance ultracapacitor electrode and manufacturing method thereof |
Also Published As
Publication number | Publication date |
---|---|
EP2142483A4 (en) | 2015-05-27 |
WO2008124258A1 (en) | 2008-10-16 |
CN101801865B (en) | 2012-10-17 |
CN101801865A (en) | 2010-08-11 |
US7716949B2 (en) | 2010-05-18 |
JP5292577B2 (en) | 2013-09-18 |
JP2010531797A (en) | 2010-09-30 |
EP2142483A1 (en) | 2010-01-13 |
US20080245107A1 (en) | 2008-10-09 |
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