US2709875A - Apparatus for grinding or polishing flat glass - Google Patents

Apparatus for grinding or polishing flat glass Download PDF

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Publication number
US2709875A
US2709875A US207701A US20770151A US2709875A US 2709875 A US2709875 A US 2709875A US 207701 A US207701 A US 207701A US 20770151 A US20770151 A US 20770151A US 2709875 A US2709875 A US 2709875A
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US
United States
Prior art keywords
support
tools
tool
pair
ribbon
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 - Lifetime
Application number
US207701A
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English (en)
Inventor
Touvay Robert
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.)
Pilkington Group Ltd
Original Assignee
Pilkington Brothers Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE502200D priority Critical patent/BE502200A/xx
Application filed by Pilkington Brothers Ltd filed Critical Pilkington Brothers Ltd
Priority to US207701A priority patent/US2709875A/en
Application granted granted Critical
Publication of US2709875A publication Critical patent/US2709875A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B24B7/22—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 inorganic material, e.g. stone, ceramics, porcelain
    • B24B7/24—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 inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass
    • B24B7/26—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 inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass for simultaneously grinding or polishing opposite faces of continuously travelling sheets or bands
    • 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
    • B24B7/22—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 inorganic material, e.g. stone, ceramics, porcelain
    • B24B7/24—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 inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass

Definitions

  • This invention relates to apparatus for grinding, lapping or polishing the surface of flat glass, and which acts simultaneously in continuous progression on the two faces of a continuous ribbon of glass, in accordance with the method known generally as the continuous grind ing-polishing of two faces.
  • an apparatus comprising pairs of upper and lower grinding or polishing tools, means for rotating the tools of each pair in planes parallel with the plane of the so that the positions of the upper and lower tools of a pair relative one to the otherremain unchanged and to this end the upper and lower tools of a pair are mounted in a single C-shaped support arranged for movement transversely of the direction of movement of the work in order to bring the tools to the side of the work for the purpose mentioned above.
  • a further object of the present invention is to permit the lower tool of a pair to be moved to servicing position independently of the upper tool so that it can be serviced or replaced without the necessity of first dismantling the upper tool.
  • an apparatus comprising pairs of upper and lower grinding or polishing tools, means to rotate the tools of each pair in planes rotation in independent supports each having traversing means associated therewith to effect movement of the tool transversely across the path of the work to said servicing position whereby the tools of a pair may be I separately moved to said position.
  • the upper tool of a pair may be moved to servicing position whilst the lower tool remains in position beneath the work to provide a support for the work, this being an important feature when the work consists of a thin glass ribbon.
  • a further main object of the present invention is to provide an apparatus for grinding or polishing simultaneously the two sides of a continuous ribbon of moving glass in which the rubbing action of the tools results from the rotary movement thereof and an oscilla tory movement transverse to the direction of movement of the work which results in the crossing, on the work, of the trajectories of each grain of abrasive material thus resulting in a substantially even grinding or polishing and reducing or eliminating the condition known in the art as directional polish.
  • the traversing means in apparatus may be operable to oscillate the supports in working position along said transverse paths whereby the grinding or polishing action of the tools results from the rotary and oscillatory movements thereof.
  • the transverse movements of the supports may be'synchronized so that the axes of rotation of the'tools of a pair are maintained in alignment.
  • Fig. l is a view partly in section on line A--A, Fig. 2,
  • Fig. 2 is a plan of a part of a glass grinding machine having aratus according to the invention, the plan being partly in section on line B-B, Fig. l, and
  • Fig.3 is a section on line C-C, Fig. 2, and shows two consecutive bays of the machine.
  • Fig. 4 is a circuit diagram illustrating one mode of effecting operation of electric motors employed in the apparatus.
  • the grinding tools of a pair comprise a lower tool 1 and an upper tool 2, the tools being illustrated in their working positions with respect F to the two sides of a glass ribbon whose median plane is represented by the lines X-Y, Fig. l, and ZZ, Fig. 3.
  • the glass ribbon is moved along the machine by rollers 3, 31, Fig. 3, the rollers, as is usual, exerting a certain pressure on the glass ribbon.
  • the tool 1 is mounted for rotation in a support 4 and the tool 2 is similarly mounted in a support 5, the axes of rotation of the tools 1, 2 being substantially in alignment and disposed to be normal to the plane of the work.
  • Fig. 3 two consecutive bays of the machine are illustrated, and in the right-hand bay the supports 41, 51, are illustrated with the tools removed therefrom in order better to illustrate the supports.
  • the tool 1 is mounted in a gear case 6 attached to the support 4 and the gear case carries the devices, of known construction, for regulating the position of the tool 1 towards and away from the plane of the work, together 3 with an electric motor 7 which rotates the shaft 8 for tool 1.
  • the tool 2 is mounted in a gear case 9 attached to the support and the gear case 9 also supports an electric motor 10 to rotate the shaft 11 for tool 2, togethehr with the devices of known construction for regulating the position of the tool 2 towards and away from the plane of the world
  • a curved metal plate 12 is movable with the support 4 and is provided to collect the mud containing abrasive or polishing material which is thrown off during the course of the work and is to protect the lower mechanism against contamination by such materials.
  • the support 4 for the lower tool 1 is provided with shoes 13, Fig. 3, which rest and slide on guide elements formed as tracks 14 forming part of angle irons 15 secured to horizontal girders 16 joining pillars 17 at opposite sides of the machine.
  • the tracks 14 are disposed on opposite sides of the support 4 and are parallel to each other and to the plane of the work and are trans verse to the direction of movement of the work through the machine, being so disposed as to be normal to the direction of movement of the work.
  • Movement of the support along the tracks 14 is effected by an electric motor 18 mounted on the support and transmitting motion through a chain 19 to a shaft 20 provided with screw threads which mesh with a toothed wheel 21 keyed to a shaft 22.
  • the shaft 22 is supported in bearings 23 and at its ends is provided with screw threads 24 meshing with toothed Wheels 25 secured to shafts 26.
  • Secured to the shafts 26 are toothed pinions 27 which mesh with toothed racks 28 secured to the angle irons 1S and extending lengthwise thereof.
  • the gear trains connecting the motor 18 with the racks 28 are reduction trains so arranged that the transverse movements imparted to the support 4 are slow as compared with the rate of rotation of the tool 1 supported thereby and reversing switches described below control the direction of rotation of the motor 18 so that the support is oscillated along the tracks 14 to obtain, as described above, a rubbing action of the tool which is the resultant of the rotary movement thereof and of the oscillatory movement in the path transverse to the direction of movement of the work.
  • the motor 18 When it is desired to effect servicing or replacement of the tool 1 the motor 18 is controlled in a manner such that it causes the support 4 to move in one direction beyond its normal stroke of oscillation until the gear case 6 thereon is moved to the position 62 indicated in broken lines in Fig. 1. During such movement, owing to the tools 1, 2 being mounted in independent supports, the upper tool 2 remains in working position above the work and it is possible at the position 62 to obtain free access to the lower tool 1 without the necessity of first dismantling the upper tool 2. If desired when the lower tool 1 is moved to the servicing position 62 a chassis as described in the aforesaid United States specification No. 2,508,863 having a work supporting plane may be made to slide progressively below the work, to support the work during the absence of the tool 1 from its working position so that operation of the machine can continue without interruption.
  • the transverse movement of the support 5 for the upper tool 2 is effected in a manner similar to that described above with reference to the lower tool by mechanism about to be described which operates in the same way as that for the lower tool.
  • an electric motor 29 is mounted on the support 5 and, through a chain 30, drives a shaft 3-1, Pigv 3, provided with screw threads which mesh with a toothed wheel 32 keyed to a shaft 33.
  • the shaft 33 is supported in bearings 34 on the support 5 and at its ends is provided with screw threads 35 meshing with toothed wheels 36 keyed to two vertical shafts 37.
  • toothed pinions 38 Secured to the shafts 37 are toothed pinions 38 which mesh with toothed racks 39 secured to horizontal box girders 40 connecting pillars 41 at opposite sides of the machine, the pillars 41 comprising continuations of the pillars 17 mentioned above.
  • the support 5 is provided with shoes which rest and slide on guide elements formed as tracks 42 secured to the upper faces of the box girders 40.
  • reversing switches control the direction of rotation of the motor 29 and determine the stroke of oscillation of the support 5 along the tracks 42.
  • Fig. 4 is a circuit diagram illustrating one mode of effecting operation of the motors 18, 29.
  • the supports 4, 5 are provided respectively with pins 43, 44 normally movable by the supports in the gap formed between the arms of rocking switch members 45, 46 pivoted at 47, 43 respectively.
  • the rocking members carry switch elements 49, 50 of which the element 49 co-operates with a forward contact 51 or a reverse contact 52 according to the direction of movement of the support 4 and the element 50 co-operates with similar contacts 53, 54 according to the direction of movement of the support 5.
  • the motors l8 and 29- may be so driven that during their operation to effect oscillation of the supports 4, 5 along the tracks 14, 42 the movements of the supports are effected in opposite directions. This can be etiected, as will be readily understood, by the circuit shown in Fig. 4.
  • Apparatus for operating on a continuously moving ribbon of glass comprising a plurality of co-axial pairs of tools of which the tools of each pair co-act to operate simultaneously on the two surfaces of the ribbon, pairs of driving rolls between said pairs of co-axial tools to drive the ribbon between the tools of each pair, an individual travelling support for each tool of a pair disposing the respective tool for rotation in a plane parallel with the path through which the ribbon is moved by the driving rolls, a first motor carried by each said support to efiect operative rotation of the tool carried thereby, a pair of linear tracks individual to each said support disposed in spaced relation to permit lateral movement of the support therebetween, traversing means carried by each support co-operating with each of the respective tracks to effect lateral movement of the support along said tracks, a reversible second motor carrled by each said support and reduction gearing connecting the reversible motor with the traversing means to produce relatively slow lateral movement of the supports as compared with the rate of rotation of the tools carried thereby.
  • each track carries a toothed rack extending lengthwise of and inwards of the respective track pair
  • the traversing means for each tool comprises a pair of pinions journalled in the respective tool support and disposed to mesh with the respective track pair, the associated reduction gear actuated by the reversible motor driving the said pair of pinions.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US207701A 1950-03-28 1951-01-25 Apparatus for grinding or polishing flat glass Expired - Lifetime US2709875A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE502200D BE502200A (US06252093-20010626-C00008.png) 1950-03-28
US207701A US2709875A (en) 1950-03-28 1951-01-25 Apparatus for grinding or polishing flat glass

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR675830X 1950-03-28
FR846815X 1950-03-28
US207701A US2709875A (en) 1950-03-28 1951-01-25 Apparatus for grinding or polishing flat glass

Publications (1)

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US2709875A true US2709875A (en) 1955-06-07

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US207701A Expired - Lifetime US2709875A (en) 1950-03-28 1951-01-25 Apparatus for grinding or polishing flat glass

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US (1) US2709875A (US06252093-20010626-C00008.png)
BE (1) BE502200A (US06252093-20010626-C00008.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060812A (en) * 1959-06-03 1962-10-30 Norman Ind Inc Van Milling machine
US3177625A (en) * 1961-03-21 1965-04-13 Saint Gobain Apparatus for simultaneously working the surfaces of a moving sheet of glass

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1044664B (de) * 1953-12-09 1958-11-20 Saint Gobain Vorrichtung zum gleichzeitigen Bearbeiten beider Flaechen von Flachglas

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1474672A (en) * 1921-11-01 1923-11-20 Heuze Charles Apparatus for grinding, smoothing, and polishing glass, plate glass, and other material substances
US1684029A (en) * 1926-12-11 1928-09-11 Hartford Empire Co Method and apparatus for polishing glass
US1803752A (en) * 1930-02-07 1931-05-05 Ford Motor Co Glass grinding machine
US2176481A (en) * 1937-03-10 1939-10-17 Pilkington Brothers Ltd Apparatus for producing ground and polished glass strip
US2398556A (en) * 1944-02-28 1946-04-16 Peerco Inc Surface treating machine
US2508863A (en) * 1919-12-08 1950-05-23 Pilkington Brothers Ltd Apparatus for grinding or polishing flat glass

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2508863A (en) * 1919-12-08 1950-05-23 Pilkington Brothers Ltd Apparatus for grinding or polishing flat glass
US1474672A (en) * 1921-11-01 1923-11-20 Heuze Charles Apparatus for grinding, smoothing, and polishing glass, plate glass, and other material substances
US1684029A (en) * 1926-12-11 1928-09-11 Hartford Empire Co Method and apparatus for polishing glass
US1803752A (en) * 1930-02-07 1931-05-05 Ford Motor Co Glass grinding machine
US2176481A (en) * 1937-03-10 1939-10-17 Pilkington Brothers Ltd Apparatus for producing ground and polished glass strip
US2398556A (en) * 1944-02-28 1946-04-16 Peerco Inc Surface treating machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060812A (en) * 1959-06-03 1962-10-30 Norman Ind Inc Van Milling machine
US3177625A (en) * 1961-03-21 1965-04-13 Saint Gobain Apparatus for simultaneously working the surfaces of a moving sheet of glass

Also Published As

Publication number Publication date
BE502200A (US06252093-20010626-C00008.png)

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