US3388843A - Glasscutting control apparatus - Google Patents

Glasscutting control apparatus Download PDF

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Publication number
US3388843A
US3388843A US55952566A US3388843A US 3388843 A US3388843 A US 3388843A US 55952566 A US55952566 A US 55952566A US 3388843 A US3388843 A US 3388843A
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United States
Prior art keywords
glass
cutting
marks
berth
sheet
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English (en)
Inventor
Forrest K Umbel
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PPG Industries Inc
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Pittsburgh Plate Glass Co
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Filing date
Publication date
Priority to NL130417D priority Critical patent/NL130417C/xx
Priority to NL279736D priority patent/NL279736A/xx
Priority claimed from US125329A external-priority patent/US3274390A/en
Priority to GB2267162A priority patent/GB984831A/en
Priority to FR900759A priority patent/FR1329142A/fr
Priority to DE19621421775 priority patent/DE1421775A1/de
Application filed by Pittsburgh Plate Glass Co filed Critical Pittsburgh Plate Glass Co
Priority to US55952566 priority patent/US3388843A/en
Application granted granted Critical
Publication of US3388843A publication Critical patent/US3388843A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D36/00—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut
    • B23D36/0008—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut for machines with only one cutting, sawing, or shearing devices
    • B23D36/0033—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut for machines with only one cutting, sawing, or shearing devices for obtaining pieces of a predetermined length
    • B23D36/0058—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut for machines with only one cutting, sawing, or shearing devices for obtaining pieces of a predetermined length the tool stopping for a considerable time after each cutting operation
    • B23D36/0066—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut for machines with only one cutting, sawing, or shearing devices for obtaining pieces of a predetermined length the tool stopping for a considerable time after each cutting operation and taking account of marks, e.g. on the stock
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
    • C03B33/0235—Ribbons
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
    • C03B33/027—Scoring tool holders; Driving mechanisms therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
    • C03B33/037—Controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/10—Glass-cutting tools, e.g. scoring tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/30—Breaking or tearing apparatus
    • Y10T225/307—Combined with preliminary weakener or with nonbreaking cutter
    • Y10T225/321—Preliminary weakener
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/30—Breaking or tearing apparatus
    • Y10T225/371—Movable breaking tool

Definitions

  • This invention relates to control apparatus for directing the cutting of glass sheet or continuous glass ribbon into a number of smaller pieces.
  • the cutting process In the manufacture of glass, the cutting process by which smaller useful sizes are produced from large sheets or continuous ribbon on a glass production line, entails cutting the glass transversely at different locations in a longitudinal, or Z direction to produce Z lengths of glass followed by slitting the Z lengths in the opposite transverse, or S, direction into rectangular pieces.
  • the rst transverse Z cuts and the subsequent transverse S cuts are selected in view of desired Z by S sizes and the locations of defects in the glass, to partition the glass into usable rectangular pieces excluding the major defect containing glass areas.
  • One object of this invention is to direct such a partitioning process such that the cutting of Z lengths into S widths is carried out completely automatically and in pace with the continuous glass production.
  • Another object of the invention is to set up the S cutter apparatus responsive to a record of S cut locations made on the Z lengths of glass.
  • Another object is to provide apparatus for detecting S marks on rapidly moving glass sheets and capable of distinguishing such marks from other opaque marks on the glass so as to insure that the S cuts are made only at the proper S locations.
  • Another object is to provide a control circuit operated by a plurality of photosensitive elements which circuit responds to simultaneous changes of state of selected ones of such elements.
  • One of the objects of the invention is to provide improved means for accurately synchronizing a series of record derived signals with the movement of the record.
  • FIGURE 1 is a schematic view depicting ⁇ a glass production line and the ilow of glass along a conveyor and laterally on side line conveyors to the S cutter apparatus;
  • FIG. 2 is a diagrammatic perspective view of vthe S cutter apparatus
  • FIG. 3 is a partial elevational View of the S marker apparatus
  • FIG. 4 is a sectional View taken along the lines of 4-4 of FIG. 3;
  • FIG. 5 is a block diagram illustrating the components of the S mark detector control circuit
  • FIG. 6 is a schematic wiring diagram of the S mark detector control circuit
  • FIG. 7 is a diagram of the clock operating the S mark detector stepping switch
  • FIG. 8 is a schematic wiring diagram of the S mark detector
  • FIG. 9 is a partial elevational view with parts in section showing details of the S cutter apparatus
  • FIG. 10 is a side view of FIG. 9 with parts in section;
  • FIG. l1 is a schematic wiring diagram of the S cutter control circuit.
  • FIG. 12 is a chart illustrating different states of the clock stages.
  • FIGURE l which comprises an overall schematic representation of a glass production line and associated glass partitioning apparatus
  • the glass is conveyed from a source such as plate glass grinding and polishing apparatus (from right t-o left in FIGURE l) by means of a roller conveyor past inspection stations to a glasscutting apparatus for making successive transverse cuts lacross the glass sheet or ribbon width, herein called Z cuts.
  • the glass conveyor is then speeded up to move or advance the Z lengths forwardly along the conveyor spacing such from the continuous ribbon glass or sheet of glass in the Z cutting apparatus.
  • Such Z lengths of glass are then shunted onto side lines and into S cutter apparatus at a cutting berth in each side line wherein a set of second cuts, herein called S cuts, are made to slit or slice the Z lengths into smaller usable widths.
  • each glass sheet Z length has on its surface a record of the cuts required to completethe partitioning process, in the form of S marks, and such information is carried along with the glass sheet as it moves downstream from the Z cutter toward the S cutter on that one of the side lines to which the glass Z length is selectively shunted.
  • the glass may be first manually inspected for the presence of defects, or, alternatively, ⁇ the glass maybe optically inspected at inspection stations upstream of the Z cutter. With manual inspection, -those defects of such severity as to atect the quality of the glass are dimensionally located by marks placed on the glass.
  • defect marks are detected by photosensitive vdevices mounted over the glass line and dimensional information as to such defect marks is transferred from the detectors tol defect storage apparatus for making a secondary record of defect location.
  • present invention is not limited to the particular defect detection, defect storage, or Z and S cut computing apparatus hereinbefore described, this invention has particular utility in an automatic glass partitioning apparatus including such components. Turning, therefore, to details of certain portions of the apparatus previously generally described, the S marker construction and operation has particular significance and cooperation with the present invention as will appear from the following.
  • the S marker apparatus is carried on a fixed bridge over the conveyor and is connected by cable to the computer for.
  • the bridge 10 carries sixty-three individually operable markers 12 for placing marks on the glass vdefining locations for S cuts at each 2 spacing across the glass. It will be understood that provision may be made for marginal trim cuts of different widths; however, for present description purposes it will be considered that with sixty-three markers all requisite S marks may be made, and an R and a sixty-fourth marker are provided, one at each end of the S marker row, for making reference marks designating the edges of the sheet.
  • the spacing of the markers may be varied as desired, it is advantageous to have the spacing between markers as small as the mechanical considerations permit so that the marks appearing on the glass may be located in a narrow band to gain time in the S mark detection and control of the S cutting apparatus.
  • the markers including the R and sixty-fourth reference markers, are mounted on 11/2 centers so that the spacing be-tween S marks on the Z length of glass is in multiples of 11/2". It will be readily understood, furthermore, that while the present apparatus is constructed to operate with 2" ⁇ as the basic dimensional unit for measuring Z by S sizes, another dimensional unit may be used as desired with suitable mechanical and electrical circuit modilications.
  • each S marker includes a crayon l t vassess-i holder pivotally mounted on the bridge 10 by means of a shaft 14, so that the holder may be moved from a normally raised position (shown in dashed lines in FIG. 4)
  • the holder for the crayon is normally positioned to maintain the crayon above the glass by a solenoid operated latch 16. In the present case the holder is yieldingly biased towa-rd the marking position by a spring 18. The position of each holder may be adjusted to move the crayon toward the the glass marking position by a cam 20 once the solenoid 22 has operated the latch 16 to release the holder. Individual earns 20 are provided for each holder and are rotated through successive positions of a cycle by a hydraulicmeans 24 connected to a shaft 26 carrying the cams.
  • the solenoid 22 provided for the latch of each holder is connected individually to the computer so that the command to make an S mark in a particular S location is transmitted from the computer through the con-y nection to the solenoid associated with the marker at that S location.
  • a suitable means for cutting the Z lengths of glass into usable widths referred to herein as the S cutter, is mounted between continuous sections of each conveyor side line to receive individual glass Z lengths.
  • the S cutter for details of a suitable S cutter apparatus, as above mentioned, reference can be made to Patent No. 3,146,926 of Charles O. Huiman, George W. Misson and William F. Galey, entitled: Glass Cutting Apparatus.
  • such cutting apparatus includes a table 30 in the form of a plurality of spaced conveyor belts 32A-32P aligned longitudinally with the side line and separating the incoming side line conveyor section 34 from a following conveyor section 36.
  • the glass Z length is delivered by the incoming side line conveyor section 34 onto the table 30 where the glass sheet is clamped for the usual scoring and snapping glasscutting operations.
  • a carriage 37 movable transversely of the table and glass Z length carried thereon from a home position shown in FIG. 2 to an away position at the opposite side of the table carries sixty-tive individual scoring devices 38-R to 38-64 mounted on 2" centers the full length of the carriage.
  • Each scoring device 38 is thus mounted at the location to score the glass sheet for an S cut and 2" from the adjacent S cut scorer.
  • selected scorer devices 38 are lowered into glass contact and a full set of score lines is made during travel of the carriage between its home yand away positions; subsequently, the glass sheet is snapped at each score line to make the S cuts.
  • each scoring device 38 includes a scoring wheel 42 pivotally mounted by a lever 44 which s normally held by a latch 46 above the glass. Actuation of the associated solenoid R-SOLV to ⁇ 64-SOL raises the latch 46 allowing a spring 48 to pivot the lever 44 and lower the scoring wheel 42 into glass contact.
  • the solcnoids R-SOL to (S4-SOL are selectively actuated by control means hereinafter described in detail.
  • each snapping device 50 has a snapping head or caster 52 which may be rai-sed into glass contact.
  • each snapping device also has a hydraulic cylinder 54 operated by a solenoid valve R-SV to 64-SV, the hydraulic cylinder being connected to raise the head of the snapping device against the bottom surface of a glass sheet on the table after the sheet has been scored by selected scoring devices during travel' of the carriage to the away position to run each cut along the score lines in the glass.
  • the carriage 30 carries resilient fulcrum elements 58 which are positioned between each of the scoring devices 50.
  • a program of S scorer solenoids R-SOL to 63-SOL is actuated with the carriage at its home position on one side of the side line, thereby setting up the scoring devices while the Z length of glass is run into the cutting berth.
  • the glass Z length is scored for all S cuts by driving the carriage, by means of a hydraulic motor, across the glass with all scoring devices of the S cut program or series in glass contact to produce all the score lines.
  • T he carriage is driven to its away position wherein the scorers are located past the edge of the glass sheet as shown in FIG. 10, and with the carriage in said position the snapping devices are successively operated to snap the glass sheet at each score line starting with the first snapping device Sil-R adjacent the left side of FIG.
  • each snapping device is hydraulically operated, the caster or head 52 which is between adjacent fulcrum elements 58 lifts the edge of the glass upward into contact with such fulcrum elements.
  • the snapping head under the glass is aligned with the score line and the upward pressure by the head in cooperation with the fulcrurn devices breaks the glass, starting the cut which runs across the sheet following the score line.
  • the individual widths of glass are run out of the cutting berth onto the following conveyor section 36 and removed from the table by operating the table belts 32A-32P.
  • the carriage 37 is subsequently returned to its home position to await the delivery o-f a succeeding Z length of glass.
  • FIG. 1l a schematic diagram of the S cutter control circuit.
  • the scorer solenoids R-SOL to S4-SOL are shown at the right side of the diagram connected between 115 volt AC buses 70 in series with relay contacts R-CR to 64-CR.
  • the buses 70 are energized fro-m a 115 volt AC source through switches, not shown, which are closed by a glass Z length moving into the S cutter and are opened following the cutting operation.
  • the scorer solenoids are energized when S relays R-CR to odi-CR are actuated either manually to insert a program of S cuts, by means of push button switches R-PB to 6ft-PB, or in accordance with a series of S marks on the glass Z length moving into the S cutter.
  • a stepping switch is driven in synchronism with the movement of the glass Z length into the S cutter.
  • S mark signals are transferred through the wiper 72 of the stepping switch to the appropriately numbered S relay R-CR to 64-CR to set up the scorer devices.
  • the S cutter apparatus is set up automatically by the S marks on a Z length of glass, which serve as a record of the S cut decisions.
  • an S mark detector is mounted above each side line conveyor 34 ahead of the S cutter and adjacent a marginal edge of the conveyor over the series of S marks on a Z length moving into the cutting berth.
  • signals from the S mark detector are conveyed through a signal storage network and an S mark detector stepping switch to the S relays of the cutter apparatus.
  • the clock drives the stepping switch in synchronism with a Z length of glass passing the S mark detector.
  • the first mark on the glass a reference mark applied by the R marker of the S marker apparatus and representing the edge of the glass accounting for trim cuts, starts the clock operating when carried under the S mark detector by a glass Z length travelling toward the S cutter.
  • the S marker records the S cut decisions in the form of marks made on the glass at multiples of 11/2 spacings which represent, however, S cuts at multiples of the 2" dimensional unit.
  • This control circuit is effective to expand the S record on the glass, scaled at multiples of 11/2, to the requisite 2" cutting scale.
  • this is achieved by stepping the wiper 72 of the stepping switch to successive positions with each 11/2 of glass movement, so that after the first 11/2 of glass movement following the reference mark, the wiper is shifted to its reference R position; after the next 11/2 of glass movement the wiper is .shifted to its S-1 position, and so on, always lagging one step behind the glass movement.
  • the S-l, S-2, S-3, etc., contacts of the stepping switch are connected to operate the l-CR, Z-CR, 3CR, etc., relays of the S cutter, respectively, to operate the same numbered scorer solenoids l-SOL, 2-SOL, 3-SOL, etc.
  • an S mark on the glass will produce a signal via the S mark detector which is stored in the signal storage network to avoid missing or misplacing S mark signals between contact positions of the wiper 72, and this signal is read out of the signal storage network and transferred through the stepping switch to the S relay having the same number as the S mark measured from the reference mark on the glass, thereby to operate the scorer solenoid having the same S number to score the glass sheet at that S location when the carriage 37 of the S cutter is operated.
  • a series of scorer solenoids 1-SOL to 63SOL is thus set up to carry out the S cut decisions recorded as S marks on the Z length of glass.
  • the S marker As shown in FIGURE 1, it is preferred to operate the S marker to place marks on each Z length adjacent both its leading and trailing edges so that an S mark detector adjacent the same marginal edge relative to glass movement, above either right or left side line conveyors will be passed by a series of S marks.
  • the S mark detector which is shown in detail in FIG. 8, comprises a circuit which responds to an S mark passing photosensitive elements, herein shown as three aligned phototubes 80, 82, 84.
  • S mark passing photosensitive elements herein shown as three aligned phototubes 80, 82, 84.
  • Such phototubes are illuminated by a light source 86 mounted below the side line conveyor 34 such that any S marks intercept the light beams reducing the illumination of the phototubes.
  • the phototube circuit responds with an output signal which actuates a suitable S mark signalling relay 88 closing its contacts 90, which are located in the signal storage network.
  • the S mark detector is responsive to S marks on the glass and is capable of distinguishing such marks from spots or other opaque marks.
  • the S marks on the glass constitute bits of data and may be at 11/2 spaced data points within the band of S marks
  • the S mark detector is capable of producing signals denoting either the presence or absence of bits of data at each data point.
  • the S mark detector includes a plurality, herein shown as three phototubes 80, 82, 84, which are mounted over the glass side line conveyor 34 at a point ahead of the cutting berth and S cutter, as shown in FIGURE 1, and are closely spaced in alignment transversely of the direction of glass movement.
  • the phototubes are located adjacent one margin of the conveyor above the S marks on a glass sheet thereon so that a line on the glass representing an S mark intercepts the light from below the glass illuminating all three phototubes producing, under such conditions, a reduction in illumination of all threephototubes.
  • an S mark will be represented by dark signals simultaneously at any two of the three phototubes in the circuit, and will produce an output signal, while a dark signal at only one phototube produces no output signal.
  • the first mark R on a glass sheet moving along a side line conveyor is a reference mark and represents the marginal cut to be made; other marks define the S cut locations in terms of the 2" diinensional unit; that is, S-17 represents 34" and S-35 represents 70 from the reference mark.
  • S marks are shown for purposes of illustration, crowded into a band of marks on the glass wherein the marks appear at multiples of 11/2 spacings, and thus such marks are not at the actual locations of the S cuts to be made. With this arrangement to gain time in the S direction, all S cut information may be read from the glass sheet to set up the S cutter apparatus before the sheet is completely into the cutting berth.
  • the S marks herein shown as lines may -be any opaque line or mark applied on the glass by means such as a washable crayon.
  • the three phototubes 80, 82, 84 used in this preferred circuit are of the photo-resistive type, having a significantly lower resistance when illuminated; that is, when connected to a sourcey of DC operating potential conventionally shown as B+, and normally illuminated through a glass sheet by the light 86 below the conveyor.
  • the resistance of such a phototube increases, representing a dark signal, responsive to a reduction in illumination of the phototube.
  • the three phototubes 80, 82, 84 are each connected in a first circuit position in series with a resistor 92A to 92C, providing a first set of parallel resistors, and to ground, with each resistor having a similar resistance value to that of the initial (illuminated) resistance of the phototube.
  • the parallel resistors 98A to 98C of the third set are also arranged in series with a resistance 102 illustratively of about 2 megohms and a source of DC potential shown as B+ to operate a suitable signalling device, herein shown as a relay 88 in the signal storage network.
  • This relay 88 is operated by a negative pulse reflecting a drop in potential in anyone of three conductors at points 104A to 194C responsive to a dark signal at any two phototubes.
  • the phototube circuit of FIG. 8 operates in the following manner.
  • the junction points in the second circuit portion are maintained at a slightly higher potential than the phototube junction points, since a proportionally greater voltage drop occurs across the third set of parallel resistors 98A to 98C with such current flow due to the higher value of such resistances, thereby charging the condensers to the potential difference prevailing between the respective junction points, which potential difference is less than the supply voltage B+.
  • the effective resistance of two and usually all three phototubes increasesy from the initial value to a markedly higher value, illustratively 1 megohm.
  • a proportionally greater voltage drop occurs across the phototube effective resistance as compared with the voltage drop across the resistance 92A to 92C in series with the phototube, causing a drop in potential at the junction point therebetween and effectively clamping the left-hand terminal of the affected condensers 94A to 94C substantially to ground potenti-al, so that the potential at the second circuit junction points 99A to 99C is reduced to the charge then existing on the affected condensers.
  • the affected condensers will then draw current from the second B+ potential source to charge the condensers toward the potential B+ and hence will return the voltages at the second circuit portion junction points 99A to 99C connected to the affected condensers to the voltage previously thereon, producing in effect a negative pulse at the junction points.
  • the circuit is arranged including diodes 106A to 106C and diodes 108A to 108C to block the transfer of any signal through to the output terminal 113 unless at least two of the condensers 94A to 94C are affected by change in illumination on the associated phototubes.
  • the left-hand terminal of the affected condensers 94A will drop to substantially ground potential thus tending to drop via the diode 168A the potential at the point 104A.
  • the point 104A will be maintained at that higher voltage via the conducting cross connection diode 106C.
  • the points 104A to 104C will be held at the high potential prevailing at the second circuit junction points 99A to 99C.
  • a higher impedance output device herein shown as a relay 88 is employed to insure that the potential at the point 113 is higher than the substantially ground potential pulse transferred through from the junction points 109A to 109C when two of the phototubes are darkened due to passing of a line thereby rendering the diodes 110A to 110C conductive to cause by-pass current to flow.
  • the S mark detec-tor phototube circuit responds to an S mark in the form of a crayon line on the glass which produces a change in excitation of at least two of the three phototubes 80, 82, 84 in the circuit, but is not responsive to an opaque mark or spot producing a change in excitation of only one phototube.
  • the signal storage network includes two circuit portions to which incoming S mark detector signals, representing S marks on the Z length of glass moving past the detection, are alternately conveyed, and from which t-he same S mark signals are alternately read out and ⁇ transferred through the S mark detector stepping switch to the S relays of the S cutter.
  • S mark signals are transferred alternately to the circuit portions, and such circuit portions are alternately read out and erased, by switch 120 having three sets of contacts 120-1, 120-2, 120-3, and operated by a solenoid 120-SOL.
  • T-he latter solenoid in turn is operated by a stepping switch SS, which may be a second level of the S mark detector switch, operating in synchronism with the glass movement. Only alternate, herein shown as the even numbered, contacts of such stepping switch are used and these contacts S-R, S-2, S-4, etc., are connected to the solenoid 120-SOL.
  • an incoming signal representing the first reference mark R on the glass Z length caused by the S mark detector relay 88 closing its contacts 90-1 is transferred through the switch arm 120B and 122A to a holding relay 124.
  • the latter relay closes one set of contacts 124-1 'to seal in the relay, a second set of contacts 124-2 to connect the output ter minal of the clock in circuit with t-he clock output relay 126, and a third set of contacts to energize a reset generator 12S for resetting the clock stages to their reference state.
  • the clock in the present case, produces an output pulse for each 11/2" of movement of glass past the S mark detector, which pulse is used lto step t-he stepping switch wiper arm 72 from position to position synchronized with the glass movement.
  • the first clock pulse received after the clock is reset to its reference state steps the wiper 72 to the contacts labelled R.
  • Each clock output pulse automatically resets the clock by means of the reset generator 128, so that the clock output pulses remain in step with the glass movement.
  • the subsequent clock pulse steps the wiper to the contacts labelled S-l, S-2 and so on.
  • the switch arm 122A shifts the switch arm 122A to its upper position thereby connecting the relay 130 to a potential source B+ through the erase contacts 132-1, and sealing in the relay 130.
  • the solenoid -SOL is energized shifting the switch arm 120C to its read out position.
  • a pulse is transferred from the potential source B-ithrough the erase contacts 132-1, the raised switch arm 122A to a read out relay 134. The latter closes its contacts 134-1 in the circuit to the wiper arm 72 of the stepper switch thereby sending a pulse over conductor R to energize the reference relay of the S cutter relays.
  • an incoming S mark detector signal representing an S mark at the first S position is conveyed to the other signal relay 136 which holds the ⁇ signal until read out when the switch 120C returns to the position shown in FIG. 5 upon deenergization of the actuating solenoid 120-SOL at position S-l of the stepping switch SS.
  • the erase relays 132 and 140 are energized to drop out the signal holding relays 130 and 136, respectively, opening erase relay contacts 132-1, 140-1.
  • the clock pulse momentarily energizes a second relay 142 which is effective to close one set of contacts 142-1 energizing the stepping switch rotor 144, and to close a second set of contacts 142-2 in a circuit including the erase coils 132, 140. Closing the latter contacts 142-2 momentarily energizes the erase coil 140, with the circuit in the condition shown, to release the associated signal holding coil 136.
  • switch arm 120A With switch arm 120A in its raised position, an erase signal is conveyed in a similar manner to the erase coil 132 to release the signal holding coil 130 after read out.
  • each of a series of signals produced by the S mark detector is fed via an individual channel to the S cutter scorer solenoid 1-SOL to 63-SOL at the S location corresponding to the position of the signal along a time base determined by the speed of glass movement.
  • This is achieved in the present case by the S mark detector stepping switch and the clock which generates synchronizing signals or pulses to move the stepping switch from position to position in synchronism with the glass movement.
  • each S mark of a series on a glass length is detected, producing a signal which is automatically transferred through the stepping switch to the proper relay ofthe S cutter.
  • the clock function may be served by various known circuits.
  • the clock is here shown in FIG. 7 to comprise series connected bistable multivibrators, conventionally shown as flip-flop devices.
  • the clock has ten of such bistable means to 16S forming ten stages with the output terminal of the tenth stage being connected to a monostable multivibrator, shown as a one-shot 172 which, upon receipt of a pulse from the tenth clock stage, fires the output relay 126 and transmits a pulse to the reset generator 128 connected to the reset terminals of each clock stage.
  • the clock thus includes ten stages representing successive places of the input pulse binary number as successive powers of 2.
  • the clock is driven in the present case by a continuous square wave input signal of a fixed frequency.
  • a source of such an input signal may be a tachometer generator driven in synchronism with a side line conveyor i0 as by a drive connection to the conveyor motor.
  • the tachometer generator output is connected through suitable means for squaring and amplifying the generator pulses, herein shown as an amplifier, to the first stage of the clock.
  • One of the features of the present invention is the provision of means to adjust the frequency of emission of synchronizing pulses produced by the clock with a high degree of accuracy, thereby accommodating very slight variations in speed of glass movement.
  • means is included in the reset circuit for selectively setting each clock stage to an initial 0 or 1 state thereby to set the reference state of all stages of the clock to the binary representation of any decimal number from one to 1024.
  • the clock is adjustable, in keeping with this invention, to synchronize the S mark stepping switch with the glass movement over a wide range of conveyor speeds.
  • the frequency of input signals to the clock from the tachometer is 5400 per second; an illustrative glass speed is 15" per second which is equal to the total distance of ten S marks spaced ll/z" apart-540 input pulses are, therefore, received by the clock for 11/2," of glass movement,
  • the flip-flop With the selector switch in position 0, the flip-flop is set by the reset generator pulse to its alternate state; with the selector switch in its l position, the iiip-flop is reset to its reference state.
  • the second horizontal line gives the initial states of all ip-iiop stages for the complement of 540; the third and sixth to ninth stages are set to their alternate states thereby all stages represent, in binary, the number 484.
  • the clock reset to the state representing the number 484 the first input pulse shifts the clock to the state representing the number 485, and so on until the clock reaches the state representing 1024 when an output synchronizing and resetting pulse is emitted from the clock tenth stage.
  • the resetting means herein described enables the selection of a clock output frequency between the limits of one to 1024 input pulses per output pulse. Moreover, in the present illustrative case where approximately one output pulse is required per 540 input pulses, the resetting selection provides a line adjustment of the synchronizing frequency in the order of one part in 500.
  • f ting berth for reading cutting information recorded as a series of marks on a glass sheet as the latter moves into said cutting berth from said conveyor, and means responsive to said cutting information for selectively operating certain of said glasscutting scoring and snapping means in said cutting berth corresponding to the series of marks on the sheet ⁇ to cut the glass sheet received in the cutting berth at cutting points determined by the marks on the sheet.
  • apparatus for partitioning glass including a glass conveyor for moving individual glass sheets to a cutting berth, said glass sheets having a series of marks according to a record scale with the presence or absence of a mark at a point on said record scale denoting whether a cut is to be made at a corresponding cutting point on a cutting scale
  • the combination comprising, glasscutting means in said cutting berth including selectively operable means for scoring and snapping a glass sheet according to said cutting scale, and means immediately ahead of said cutting berth for reading cutting information recorded at said record scale, for changing said information to said cutting scale and for setting up said glasscutting means to cut said sheets at said cutting scale responsive to marks on the sheet.
  • apparatus for partitioning individual glass sheets including a glass conveyor for moving said glass sheets to a cutting berth, and means for recording on a record medium the locations of cutting points for each glass sheet in the form of marks at one or more of each of a set of data points, the combination comprising, a cutting berth having a set of incrementally spaced glasscutting scoring and snapping means corresponding to the set of data points, means for reading the record of a glass sheet upon said sheet reaching said cutting berth including detection means operative in cooperation with relatively moving recordrmedium for detecting the presence or absence of a moving mark at each of said data points and for producing an output signal representing each cutting location mark, and means operated by said detection means output signals for selectively setting up the corresponding ones of said glasscutting and snapping means to cut said sheet at cutting points determined by marks on said record medium.
  • apparatus for partitioning glass including a glass conveyor for moving individual glass sheets to a cutting berth, each of said glass sheets having a series of Cutting marks at spaced data points, with the presence or absence of a mark at a data point denoting whether a cut is to be made at a corresponding cutting point on the sheet, the combination comprising, detection means immediately ahead of said cutting berth for producing a signal denoting the presence or absence of a cutting mark at each data point on a glass sheet moving past said detectlon means into said cutting berth, glasscutting apparatus 1n said cutting berth including selectively operable means for scoring and snapping a glass sheet at cutting points corresponding to all said data points, and means for conveymg data point signals to said glasscutting apparatus for scoring a glass sheet at cutting points determined by cutting marks on the sheet followed by snapping the sheet at such score lines.
  • each width comprising a multiple of a fixed dimensional increment
  • a glass conveyor for moving said glass sheets to a cutting berth, and means operative before each glass sheet reaches said cutting berth to record on a record medium the locations of cutting points for the respective sheets in the form of bits of data at a series of data points corresponding to said cutting points, the presence or absence of bits of data at a data point determining Whether or not a cut is t be made at the corresponding cutting point
  • the combination comprising, glasscutting means in said cutting berth selectively operable to cut a glass sheet transversely at any one or more of multiple cutting points spaced by said fixed dimensional increment so as to provide said preselected Widths
  • means for reading the record of a glass sheet upon said Sheet reaching said cutting berth including detection means for producing a signal denoting either the presence or absence of bits of data at each data point for said glass sheet, and means operated by said detection means signals for setting up said
  • a glass partitioning apparatus in which the glass is the record medium, which includes means for applying a series of marks to the glass sheets designating the locations of cutting points for the respective sheets, and which include means for starting said detector responsive to the passing of the first of a Series of said marks.
  • each width comprising a multiple of a fixed dimensional increment
  • a glass conveyor for moving said glass sheets to a cutting berth, and means operative before each glass sheet reaches said cutting berth to record the locations of cutting points for the respective sheet in the form of bits of data at a series of data points on said glass sheet spaced at a smaller distance than said fixed increment and corresponding to said cutting points, the presence or absence of bits of data at a data point determining whether or not a cut is to be made at the corresponding cutting point
  • the combination comprising, glasscutting means in said cutting berth selectively operable to cut a glass sheet transversely at any one or more of multiple cutting points uniformly spaced by said fixed dimensional increment so as to provide said preselected Widths
  • means for scanning a glass sheet moving into said cutting berth including detection means for producing a signal denoting either the presence or absence of bits of data at each data point for said glass sheet, and means timed responsive to
  • apparatus for partitioning glass including a glass conveyor for moving individual glass sheets to a cutting berth, and means upstream of the cutting berth for recording a series of cutting marks at spaced data points on a record medium with the presence or absence of a mark at a data point denoting whether a cutis to be made at a corresponding cutting point on the sheet, the combination comprising, detection means operative in cooperation with said record medium for producing a signal denoting the presence or absence of a cutting mark at each data point for a glass sheet moving into said cutting berth,
  • glasscutting apparatus in said cutting berth including selectively operable means for scoring and snapping a glass sheet at cutting points corresponding to all said data points, and means for conveying data point signals to said glasscutting apparatus for scoring a glass sheet at cutting points determined by cutting marks on the record medium followed by snapping the sheet at such score lines.
  • apparatus for partitioning glass including a glass conveyor for moving individual glass sheets to a cutting berth, and means upstream of said cutting berth for recording cutting information on each glass sheet in the form of marks representing the locations of cutting points
  • the combination comprising, glasscutting means in said cutting berth including a set of parallel, intermittently spaced, simultaneously operable cutting elements, and a light responsive detector means for detecting cutting marks on each sheet, for setting up selected ones of said cutting elements as a sheet moves into said cutting berth, and for simultaneously operating set-up elements after a sheet is received in said cutting berth to cut up the sheet according to a cutting pattern established by said marks.
  • apparatus for partitioning glass including a glass conveyor tor moving individual glass sheets to a cutting berth, and means upstream of said cutting berth for recording cutting information on each glass sheet in the form of marks, the locations of cutting points for the sheet, the combination comprising, glasscutting means in said cutting berth, and a light responsive detector for detecting cutting marks on each sheet, for translating into cutting instructions the relationship of said cutting marks independently of their actual position on the sheet, and for controlling the cutting pattern of said glasscutting means for each sheet received in the cutting berth according to said instructions.
  • An apparatus in which said detector is light responsive, actuated responsive to a series of marks on each glass sheet, and effective to set up a corresponding series of cutting elements in said glasscutting means of said cutting berth.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Control Of Cutting Processes (AREA)
US55952566 1961-06-16 1966-06-22 Glasscutting control apparatus Expired - Lifetime US3388843A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL130417D NL130417C (enExample) 1961-06-16
NL279736D NL279736A (enExample) 1961-06-16
GB2267162A GB984831A (en) 1961-06-16 1962-06-13 Apparatus for partitioning glass
FR900759A FR1329142A (fr) 1961-06-16 1962-06-14 Appareil pour diviser du verre
DE19621421775 DE1421775A1 (de) 1961-06-16 1962-06-16 Vorrichtung zum Trennen von Tafelglas
US55952566 US3388843A (en) 1961-06-16 1966-06-22 Glasscutting control apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US125329A US3274390A (en) 1961-06-16 1961-06-16 Glass cutting control apparatus
US55952566 US3388843A (en) 1961-06-16 1966-06-22 Glasscutting control apparatus

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US3388843A true US3388843A (en) 1968-06-18

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US55952566 Expired - Lifetime US3388843A (en) 1961-06-16 1966-06-22 Glasscutting control apparatus

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US (1) US3388843A (enExample)
DE (1) DE1421775A1 (enExample)
GB (1) GB984831A (enExample)
NL (2) NL130417C (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592370A (en) * 1968-11-14 1971-07-13 Pilkington Brothers Ltd Cutting of glass sheets
FR2391171A1 (fr) * 1977-05-20 1978-12-15 Bottero Spa Perfectionnements aux tables pour l'incision de feuilles de verre
US6616025B1 (en) * 2000-08-31 2003-09-09 Corning Incorporated Automated flat glass separator
US20070228630A1 (en) * 2004-06-03 2007-10-04 Richard Grundmuller Table for Receiving a Workpiece and Method for Processing a Workpiece on Such Table
US20090095803A1 (en) * 2003-08-01 2009-04-16 Peter Benischke Method and apparatus for cutting off glass panes from a continuously produced glass sheet

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141589A (en) * 1959-06-06 1964-07-21 Saint Gobain Method of and apparatus for cutting glass sheets

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3141589A (en) * 1959-06-06 1964-07-21 Saint Gobain Method of and apparatus for cutting glass sheets

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592370A (en) * 1968-11-14 1971-07-13 Pilkington Brothers Ltd Cutting of glass sheets
FR2391171A1 (fr) * 1977-05-20 1978-12-15 Bottero Spa Perfectionnements aux tables pour l'incision de feuilles de verre
US6616025B1 (en) * 2000-08-31 2003-09-09 Corning Incorporated Automated flat glass separator
US20040050894A1 (en) * 2000-08-31 2004-03-18 Corning Incorporated Automated flat glass separator
US7234620B2 (en) 2000-08-31 2007-06-26 Corning Incorporated Automated flat glass separator
US20090095803A1 (en) * 2003-08-01 2009-04-16 Peter Benischke Method and apparatus for cutting off glass panes from a continuously produced glass sheet
US20090120253A1 (en) * 2003-08-01 2009-05-14 Peter Benischke Method and apparatus for cutting off glass panes from a continuously produced glass sheet
US7963200B2 (en) * 2003-08-01 2011-06-21 Schott Ag Method for cutting off glass panes from a continuously produced glass sheet
US7975581B2 (en) * 2003-08-01 2011-07-12 Schott Ag Apparatus for cutting off glass panes from a continuously produced glass sheet
US20070228630A1 (en) * 2004-06-03 2007-10-04 Richard Grundmuller Table for Receiving a Workpiece and Method for Processing a Workpiece on Such Table
EP2216276A3 (de) * 2004-06-03 2011-06-29 Oerlikon Solar IP AG, Trübbach Vorrichtung zur Bearbeitung und zur Positionierung eines Werkstücks sowie Verfahren zum Gebrauch einer solchen Vorrichtung
US8785812B2 (en) 2004-06-03 2014-07-22 Tel Solar Ag Table for receiving a workpiece and method for processing a workpiece on such table

Also Published As

Publication number Publication date
NL279736A (enExample) 1900-01-01
NL130417C (enExample) 1900-01-01
GB984831A (en) 1965-03-03
DE1421775A1 (de) 1968-10-31

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