US3892153A - System for cutting pieces from a traveling strip of sheet material - Google Patents

System for cutting pieces from a traveling strip of sheet material Download PDF

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Publication number
US3892153A
US3892153A US434065A US43406574A US3892153A US 3892153 A US3892153 A US 3892153A US 434065 A US434065 A US 434065A US 43406574 A US43406574 A US 43406574A US 3892153 A US3892153 A US 3892153A
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Prior art keywords
strip
traveling
sheet
sheet material
severing
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English (en)
Inventor
Tetsuji Kato
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Mitsubishi Rayon Co Ltd
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Mitsubishi Rayon Co Ltd
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    • 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
    • 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
    • B23D36/0016—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 minimising waste
    • 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
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/18—Machines with circular saw blades for sawing stock while the latter is travelling otherwise than in the direction of the cut
    • B23D45/20—Flying sawing machines, the saw carrier of which is reciprocated in a guide and moves with the travelling stock during sawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D11/00—Combinations of several similar cutting apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/02—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor characterised by a special purpose only
    • B27B5/06—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor characterised by a special purpose only for dividing plates in parts of determined size, e.g. panels
    • B27B5/063—Sawing travelling workpieces
    • 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
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates
    • 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
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2066—By fluid current
    • Y10T83/207—By suction means
    • 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
    • Y10T83/00—Cutting
    • Y10T83/242—With means to clean work or tool
    • 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
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4653—With means to initiate intermittent tool action
    • Y10T83/4656—Tool moved in response to work-sensing means
    • Y10T83/4676—With work-responsive means to initiate flying movement of tool
    • Y10T83/4679—With flying work-gripper means related to tool carrier
    • 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
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4653—With means to initiate intermittent tool action
    • Y10T83/4656—Tool moved in response to work-sensing means
    • Y10T83/4676—With work-responsive means to initiate flying movement of tool
    • Y10T83/4682—With means controlling flying speed dependent on work speed
    • 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
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4705—Plural separately mounted flying cutters
    • 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
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4757—Tool carrier shuttles rectilinearly parallel to direction of work feed
    • Y10T83/476—Including means to secure work to carrier
    • 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
    • Y10T83/00—Cutting
    • Y10T83/525—Operation controlled by detector means responsive to work
    • Y10T83/541—Actuation of tool controlled in response to work-sensing means
    • Y10T83/543—Sensing means responsive to work indicium or irregularity

Definitions

  • 83/100; 83/168; 83/294; of i her r ll leng h ing y r in n n, hi h 83/295; 83/303; 83/319; 83/37l can be obtained from the length cut.
  • This procedure [51 1 Int. Cl. B29c 17/10; B23d 45/02 reduces the loss or waste due to the marks 0r defects, [58] Field of Search 83/l00, I68, 293, 294, to a minimum.
  • a special system is provided for this 83/295, 319, 371, 71, 303 practice and for cutting out the marks or defects between the unmarked strip portions free from defects, [56] Ref e Cit d with a minimum of loss or waste.
  • Other features are UNITED STATES PATENTS Groves et al 83/71 X involved.
  • the present invention relates generally to a system for cutting pieces having selected diverse lengths from a traveling strip of sheet material, such as plastic sheet, glass sheet, and laminated plywood sheet, and more particularly relates to a cutting system adapted for use in cutting a belt-like plastic sheet continuously cast between opposing traveling spans of long endless metal loops.
  • sheets which must be of different lengths to meet specifications are obtained by first producing the sheet material such as plastic, glass and the like in strip form and then transversely severing the strip at intervals to provide the required sheets. Also, it is quite usual that the production of the sheet material and the severing of the required sheets are carried out in directly connected continuous processes in order to effectively use a limited factory space. That is, the severing of the required sheets is carried out without stopping the traveling of the sheet material continuously fed from the sheet material production process.
  • an apparatus comprising a strip cutter and means for reciprocating this cutter through a cutting cycle composed of a cutting stroke and a return stroke.
  • the cutting stroke moves the cutter diagonally across the traveling strip at an angle and speed which causes the cutter to sever the strip at right angles, and the return stroke returns the cutter to a position of readiness for a succeeding cutting cycle.
  • the cutter may be a diamond, while, for example, rotary saws may be used as the cutter for plastics.
  • Other examples would be a pressurized water jet or a laser ray, used as the cutter for both glass and plastic.
  • the cutter is mounted on a carriage running on a track positioned diagonally and transversely over the traveling strip.
  • the carriage is driven, for example, by sprocket chains which are driven by sprocket wheels, or by being in screw-threaded engagement with a threaded drive shaft extending along the length of the track.
  • the design is such that the cutter carriage is driven through a cutting stroke. at a speed related to the angularity of the track, so that the cutter cuts the traveling strip at right angles.
  • the cutter carriage drive is then reversed to effect a re turn stroke of the carriage, during which the cutter moves to an inoperative position free from the strip in readiness for a succeeding cutting stroke. In this fashion, the cutter is reciprocated through a cycle of the two strokes and the time for completion of this cycle,
  • the strip continues to travel, the speed of the cutting stroke being fixed as required by the angularity of the cutting stroke. and the strip traveling speed, and the speed of the return stroke being limited by practical mechanical design considerations.
  • the cutter formed by a set of upper and lower rotary saws. is carried by a carriage which reciprocates at right angles to the traveling strip but with this carriage mounted on a frame to reciprocate parallel with respect to the traveling strip; with the frame moving synchronously with the strip while the cutter carriage moves transversely with respect to the strip, and with proper timing of the motions, the strip is severed at right angles.
  • the cutter carriage is ordinarily reciprocated transversely with respect to the frame by being in screw-threaded engagement with a threaded drive shaft.
  • the return stroke of the cutter carriage cannot be made extremely fast. Therefore, with this type of apparatus, also, the minimum length of a piece that can be severed from a traveling strip, is limited.
  • One example is in the production of a strip of cast plastic leaving a continuous casting machine of the type using two stainless steel endless belts defining a continuously traveling casting space into one end of which a liquid which hardens with temperature, is cast to produce the continuously traveling strip from its other end and requiring severing into commercially desirable lengths.
  • One of these belts is usually longer than the other, and in each instance the endless stainless steel belt is formed by welding together the ends of a suitable length of stainless steel strip.
  • the weld lines may mark the cast strip surfaces and such markings occur at random on the opposite surfaces of the strip.
  • the marked portions must be removed by cutting and in the inter ests of manufacturing cost reduction, the marked pieces should be cut as short as possible, as they are mostly discarded as waste or used as reclaiming material.
  • the type of apparatus using a set of upper and lower rotary saws is more appropriate, but this apparatus cannot make repeated cuts rapidly enough to cut out the desired minimum lengths from the strip to remove the imperfect portions with a minimum of waste.
  • plastic strip which is of infinite length because of the continuous production involved, it may be desirable to produce two or more different lengths of commercially ac ceptable sheets from between the pieces which must be cut out and wasted because of being marked by the belt welds.
  • the plastic strip may unfortunately require removal of imperfections or manufacturing defects other than the unavoidable belt weld marks.
  • the traveling strip could be cut rapidly enough, the imperfect portions could be removed and these could be of relatively short lengths, while the two or more different lengths could be severed from each usable portion between neighboring imperfect portions in a manner determined to produce an appropriate number of commercially acceptable sheets of the two or more different lengths while minimizing the loss which is defined as the remaining sheet portion resulting from severing the appropriate number of sheets of the two or more different lengths from the usable sheet portions.
  • the yield of sheets usable as first-grade products which can be obtained from the strip portions between the defects as related to the amount of the cast plastic strip material which must be considered waste. has, of course, a direct relationship on the overall costs of manufacturing the plastic sheets in different commercial lengths, or lengths specified by customers of the sheet manufacturer.
  • a principal object of the present invention is to provide a system for cutting or severing such strip sheet material, particularly, but not exclusively, continuously cast plastic strip sheet material, into sheets of commercially required lengths so as to obtain a better yield of sheets from the strip sheet material of infinite length containing the randomly interspaced defects.
  • Another object of the present invention is to provide a system capable of meeting the requirements of rapid cutting of the traveling strip to thereby remove relatively short lengths of the traveling strip which contain the imperfect portions.
  • a system for cutting pieces from a traveling strip of sheet material in which when two or more stocks of sheets of relatively longer and shorter lengths are to be obtained, the length of each usable strip sheet material portion is measured. for example, by measuring the portions of strip approaching a strip severing or cutting means, in the case of a continuously traveling strip. In the system this can be clone by a measuring wheel running on the continuously traveling strip and feeding the results to a computer.
  • a combination ratio of sheet piece numbers of the different lengths for obtaining an entire combined length which amounts more closely to but is small than the measured, or otherwise determined, length value of each usable portion of the strip sheet material, is then determined, thereby to minimize loss produced when the sheet pieces of the different lengths are subsequently severed from the usable strip portion of the sheet material in the determined combination ratio.
  • the above requires that at least two stocks of sheets of relatively longer and shorter lengths are to be obtained by cutting the strip.
  • the various sheet length values are stored for comparison with the usable strip sheet material portion values successively measured.
  • the computerized equipment also stores the above determined combination ratio of sheet piece numbers of at least two different lengths for cutting from the usable strip sheet material portions. This stored combination ratio of numbers of sheets is then translated into automatic control of strip severing or cutting means which then automatically severs the sheet pieces of at least two different lengths from each of the portions measured, in that combination ratio.
  • the rapid cutting of the traveling strip to remove relatively short lengths containing the imperfect portions is attained by using a strip severing or cutting means which includes a first severing apparatus of the type described and a second apparatus which may be substantially the same as the first and positioned in series with and behind the first with respect to the traveling direction of the strip. Also. the second apparatus is positioned he hind the first one so as to interspace the respective cutters of the two, in the longitudinal direction of the traveling strip, at a distance less than the minimum length the first apparatus could sever by going through two cy- 4 cles of operation times as closely together as possible while allowing time for the cutter reciprocating means to go through the cutting stroke and the return stroke prior to going through a second cycle.
  • each of the two apparatuses is operable through its cycle in dependently with respect to the other. Therefore, the first apparatus can make a cut and when the initially cut portion reaches the second apparatus, it can also start through its cycle, thus permitting extremely short pieces to be severed from the strip, which is of particular advantage in removing short imperfections.
  • the cutter reciprocating means of the two apparatuses when required, means are provided for automatically operating in sequence, the cutter reciprocating means of the two apparatuses through their cycles. with the cutter reciprocating means of the second apparatus starting its cycle while the cutter reciprocating means of the first apparatus is still going through its cycle.
  • another preferable feature is the provision of means responsive to the approach of a predetermined length of the strip to the system of the first and second apparatuses, that length being less than the minimum length either could sever, for starting the cycle of the cutter reciprocating means of the first of the two apparatuses and thereafter, starting the cycle of the cutter reciprocating means of the second apparatus, when severing from the strip a piece having that predetermined length. For example.
  • the predetermined length may represent an imperfection and may be of varying extent lengthwise with respect to the strip, the extremes of this length being marked by an inspector and the markings used to automatically initiate the sequential operation of the two apparatuses, with the start of each cycle timed to sever the opposite end, front and back, of the piece containing the imperfection.
  • FIG. is a schematic block diagram showing a typical system for cutting pieces from a traveling strip of sheet material according to the present invention.
  • FIGS. 2a through 2d are graphs illustrating the computing principles carried out by the computer of the system of FIG. 1;
  • FIG. 3 is a schematic view illustrating a continuous plastic casting machine
  • FIG. 4 is a graph showing yield curves representing applications of the computing principles
  • FIG. 5 is an elevational front view of a first type of sheet severing apparatus of a system for severing pieces from a strip of sheet material according to an embodiment of the present invention
  • FIG. 6 is a plan view of FIG. 5 with a controller shown diagrammatically;
  • FIG. 7 is a plan view, schematically showing the first and second sheet severing apparatuses of a second type. with their controller represented diagrammatreally;
  • FIG. 8 is an elevational front view showing a system which is a modification of the system of FIGS. 5 and 6;
  • FIGS. 9 and I0 are schematic side and front views, respectively, showing further modifications of a sheet severing system attained by the present invention.
  • reference numeral i0 is a traveling strip of sheet material which is continuously fed from a sheet production machine such is exemplified hereinafter.
  • a pickup 11 for emitting an electric signal in response to each predeterminable traveling length of the strip 10
  • a pickup 12 for detecting each reference point of the strip
  • pickups 13 arranged in the transverse direction of the strip 10 of the sheet material.
  • pickups 14 for detecting thickness imperfections of the sheet material.
  • Each of pickups 11 through 14 may be of an electric, an electronic, or a photo-electric type.
  • the respec tive outputs of the pickups 11 through 14 are transferred to an electronic computer 15.
  • information such as specified lengths of sheet pieces to be cut from the strip 10 of the sheet material. the number of sheet pieces required to be cut from the strip 10 of the sheet material and the like, are also supplied to the computer 15 from an operating panel 16.
  • a sheet severing apparatus 21 is arranged across and over the traveling strip 10 of the sheet material.
  • the apparatus 21 comprises a set of upper and lower rotary saws 22a. 22b mounted on the shafts of motors (not shown) carried by a carriage 23 transversely movable on a frame 24 which is mounted and guided on stationary beds 25a. 25/) so as to reciprocate in directions parallel to the strip's traveling direction.
  • movement of frame 24 is synchronized with and is in the same direction the traveling of the strip.
  • a presetting counter controller 17 is provided with three presetting counters 17a, l7b and 17c, in each of which a number representing a length of piece to be cut from the traveling strip 10 of the sheet material can be preliminarily set. These three presetting counters 17a, 17b and 17: continuously and simultaneously count electric pulses coming from pickup 18. Each counter I711. 17)) or 17c is reset to zero when the number of counted pulses reaches a number preliminarily set in each counter. and then each counter subsequently counting the electric pulses coming from pickup 18. Further. in the system of FIG. I, a connection is provided between computer 15 and presetting counter controller 17 so that computer 15 can select one of three counters 17a. I7! and 17c. Thus.
  • pulse motor controller 19 When pulse motor controller 19 receives the starting signal, it supplies electric pulses coming from pickup 18 to electrohydraulic motor 20. As a result. frame 24 of the severing apparatus 21 starts to move by the drive of the motor 20 in the same direction as and in synchronization with the traveling speed of the strip 10. A con troller 26 starts to control the severihg operation of the severing apparatus 21 when the controller 26 receives a signal indicating the start of electrohydraulic pulse motor 20 from the pulse motor controller 19.
  • the controller 26 controls a sequence of the operations of the severing apparatus 21, such as clamping the traveling strip 10 of the sheet material (described hereinafter); traversing severing saws 22a, 22b across the strip 10 and releasing the above clamping of the strip 10 while retracting saws 22a, 22b apart from each other to positions where no interference is provided between saws 22a. 22b and the traveling strip 10, after completion of the traversing of severing saws 22a, 22b.
  • the controller 26 provides a feedback signal to pulse motor controller 19 when the traversing of severing saws 22a, 22b is completed. Then, based upon this feedback signal, electrohydrauiic motor 20 is temperarily stopped and subsequently.
  • the motor 20 is restarted in its reverse operation thereby returning frame 24 to the initial position. While frame 24 is returning to the initial position. the carriage 23 carrying severing saws 22a, 2211 also returns to its initial position. Consequently. one cycle of the cutting motion of the severing apparatus 21 is. therefore. completed and the severing apparatus 21 is ready for the subsequent cutting cycle.
  • a feedback signal is emitted from controller 26 to both pulse motor controller l9 and computer 15. Then. computer 15 supplies to the presetting counter controller 17, a counter selection signal by which one of counters through 17c. capable of representing the length of the sheet piece to be subsequently cut from the traveling strip 10 of the sheet material. is selected.
  • the computer 15 carries out a computation for determining as to what combination ratio of numbers of sheets of three kinds of specified differing lengths preset in presetting counters 17a through 17c, can obtain an entire combined length which amounts closest to but is smaller than the usable length of the strip between the above confirmed defect or thickness imperfection and the strip portion approaching the severing apparatus 21, or the immediately previously severed strip portion. whereby to minimize loss produced when the sheet pieces are severed from the usable strip sheet material portion in the determined combination ratio of number of sheets.
  • the resulting combination ratio for the usable strip portion is then stored in computer 15.
  • computer 15 supplies to presetting counter controller 17.
  • sequential counter selection signals for indi eating which of the three presetting counters 17a through 170 which presets the number representing the length to be cut from the traveling strip 10, should be selected for each of said sequential counter selection signals.
  • severing is carried out to ob tain different lengths of sheet pieces in the computed combination ratio of numbers of sheets.
  • computer 15 also carried out the same computation as described above with respect to the usable strip portion between the two defects or thickness imperfection positions and computer 15 stores the computed result. Then. based upon this computed result. computer 15 supplies counter selected signals to presetting counter controller 17 whereby the severing of the usable strip portion is carried out.
  • the defect or thickness imperfection portion appearing in the traveling strip continues longer than any of the lengths of the strip preset in the counters 170 through 17c.
  • two of the counters 170 through 17c are used for presetting the lengths of the sheet pieces going to commercial products while the remaining single counter is used for presetting the number representing the appropriate length into which the long defect or thickness imperfect ion portion is severed.
  • the appropriate length of the severed defect or thickness imperfection sheet pieces is discarded as waste or used for reclaiming material.
  • Computer 15 can also directly supply a signal to pulse motor controller 19 for starting the severing of the strip 10. This fact enables severing apparatus 21 to sever the strip immediately after the defect or imperfection position confirmed by computer passes under severing apparatus 2]. As a result. from the usable sheet portion subsequent to the defect or imperfection position. first-grade sheet pieces can be severed with a better yield.
  • Pickup 12 is arranged to as to detect the passing of the sheet positions having the markings formed by specified weld lines of the endless belts of the sheet production machine. This detection of the passing of the markings is also transferred to computer 15 and as a result. based upon the positions of the markings. the positions of the other defective portions of the traveling strip 10. which result from the weld lines of the endless belt other than the specified weld lines and/or defects on the surfaces of the endless belt of the sheet production machine. are preliminarily found by computer 15. The positions of the weld lines of the endless belt other than the specified weld lines and/or the positions of defects on the surfaces of the endless belt. relative to the LII positions of the specified weld lites. can preliminarily be stored in the computer 15 as input information. Consequently, computer 15 can carry out the aforementioned computation to determine the combination ratio of numbers of sheet in which ratio sheet pieces can be severed from each usable strip portion between two defects so as to minimize loss.
  • each usable portion of this length is long enough to permit a number of the sheets to be cut from it In practice. each usable portion is between either two defects in the strip or between the cut end of the strip and one defect. After cutting each usable strip portion into a predetermined number of sheets of two or more different lengths. there must remain a portion of usable material that is too short to provide one more sheet having any one of the specified lengths and this portion must be considered as loss. the entire length of every sheet obtained being the yield. With this understanding, loss is expressed by the following formula where Ni represents the number of sheets and Ti represents the sheet lengths which it is to be assumed are specified to considered as standard lengths:
  • the new method is based on the principle that Ni may be selected so as to minimize loss when 1 and Ti are given.
  • FIG. 2 series which schematically illustrate the above.
  • the abscissa in each of the graphs (1 to d indi cates the strip length l in meters and the ordinate represents loss.
  • Graph 2a shows an example where i in the above equation is selected to be one throughout the length; a single standardized length of sheet is cut from the strip. the sheet length in this instance being llOt) mm. in this case.
  • the loss shows a uniform repetition and the average loss value is half of Ti.
  • ln graph 2b showing the practice of this new method, different lengths are cut in appropriate combination ratio of sheet numbers from the usable portions of the strip. in this instance. the different specified lengths being i mm and i400 mm. and graph 1c is the same except that in this instance the specified sheet lengths are l lOO mm and 2000 mm.
  • the two graphs show how loss may be reduced by determining an appropriate combination ratio of numbers of sheets for the two or more different lengths and by cutting from each usable strip portion provided by length l. the sheet pieces in the determined combination ratio of numbers of sheets. These graphs show that the larger the value of l. the smaller the value of loss. until a practically negligible minimum loss results.
  • the graph 2d provides an example where three different sheet lengths are involved.
  • the standard or speci fied sheet lengths in this instance being l 100 mm. i400 mm, and 2000 mm, loss being reduced to the minimum or practically negligible amount when the value ofl exceeds 6.4 m as can be seen from the graph.
  • the yield improvement obtained by cutting sheet lengths of a plurality of different standardized or specified lengths from the successive usable portions depends on the combination used and is independent in practice, of the precise extents of the various lengths, providing the combined lengths are mutually complementary, as is illustrated later herein.
  • FIG. 3 schematically shows an example of a machine by which continuous cast plastic strip sheet material may be produced.
  • the two endless belt loops 27 and 27' are shown with opposing adjacent spans. Although the scale of the drawing does not permit it to be shown. These two mutually adjacent belt spans are interspaced to provide the casting thickness desired, and the belts are driven so that the two spans travel in the same direction at the same speed. However, the belt loop 27' is longer than the belt loop 27.
  • Each endless belt has at least a weld joint shown on an exaggerated scale at 270 and 27b, and which inevitably mark the cast plastic strip obtained, the unhardened raw material being cast between the belts at 28; the hardened strip of plastic sheet material leaving continuously at the other end of the casting space defined between the two mutually adjacent belt spans.
  • This raw material may be a polymerizable material, which is polymerized and hardened while traveling through a heating zone 29 heating the belts.
  • the present invention is, in one aspect, concerned with severing sheets of differing specified lengths from such continuously cast plastic sheet material, coming from the equipment of FIG. 3 continuously as a strip of infinite length.
  • the strip material leaving the casting machine of FIG. 3 is usually automatically inspected in the inspection process by defect detecting pickups as described with reference to the system of FIG. 1, which detects defects caused by the randomly interspaced belt weld joint marks or by intermixing of foreign materials, and thickness imperfections.
  • the pickups transfer the detected signals to the computer.
  • the length of the usable portions can also be determined by the computer, based upon the signals indicating defects or imperfections which are supplied from the above-mentioned pickups.
  • the different lengths of sheets to be cut into stocks or inventories. or to meet customer orders, are, of course, specified and known.
  • a cutter such as one using saws, of the type capable of making right angular cuts without stopping the traveling strip, is indicated at 30.
  • an appropriate combination ratio of numbers of respective sheet pieces having the above respective sheet lengths, of which there must be two or more. are computed. by the computer, so that the entire combined length of the sheet pieces amounts closest to each of the successively measured usable strip portion lengths while minimizing losses as they travel between the casting equipment and the cutting apparatus 30. Then, as each portion reaches the cutting apparatus 30, the latter is actuated, under computer control, to cut only that sheet length from each usable strip portion, in each determined combination ratio of numbers of sheet, the cutting apparatus being, of course, successively operated. This procedure is repeated for each successively produced usable portion of strip sheet material, to obtain the stocks or collec tions of the sheets of different lengths.
  • FIG. 4 is a graph showing examples of yield curves resulting from the use of the present principles, as simulated by the computer, the abscissa showing the number of faulty strip surface portions such as might be caused by the belt weld joints of the FIG. 3 casting apparatus, and the ordinate showing the product yield when the strip containing the defects is transversely cut at intervals spaced along its longitudinal extent.
  • the conditions assumed are that one of the belt loops in FIG. 3 is 206 m long and the other is 208 m long, each having weld joints, the specified cut sheet lengths selected being I200 mm, 1500 mm, and 2200 mm.
  • the only faulty portions of the strip considered are those occasioned by the belt weld marks which are assumed to be only I00 mm in length, or less where noted.
  • a ran dom number is used to randomize the portions in which the defects occur under practical commercial plastic strip sheet material casting conditions using a machine such as shown by FIG. 3, for example.
  • Each pair of curves shown as Case I and Case 2 correspond to two cases wherein the positions of the faulty portions of belts are different.
  • the two curves I at the bottom of the chart correspond to the case where the sheet lengths are all of 1500 mm each.
  • the yield lowers almost to the line marked Pessimism Yield Line, this meaning that the full length of one sheet I 500 mm in this instance) must he considered a faulty sheet portion having one strip defeet.
  • the yield never lowers below this pessimism yield value because two or more defects may appear within a range or length corresponding to a specified sheet length, in practice.
  • the two curves III in the graph represent the practice of the principles of the present invention, two different specified sheet lengths of I500 mm and 2200 mm being cut in an appropriate ratio of sheet numbers, to minimize the resulting loss due to cutting out the weld defects.
  • the yield in this case is sharply improved compared to the other cases where the sheet lengths cut are to obtain only one stan dard or specified length.
  • Two curves IV emphasize the advantages of the invention. the combination of sheet lengths in this instance being I200 mm, 1500 mm, and 2200 mm, cut in an appropriate ratio to minimize the waste due to removal of the weld joint defects, the yield approaching, particularly when the defective portions are few in number. close to the Optimum Yield Line". This term means the yield attainable on the assumption that after the minimum removal of material to the weld joint marks, the entire remaining strip material provides usable sheets of the specified size being cut. This yield can never be exceeded.
  • electrohydraulic pulse motors 36 which may both be fed by the controller 38.
  • Clamps 39 steady the sheet 10 while the set of saws 22a and 22b is driven through its cutting stroke. Reciprocation of the frame 24 is effected also via electro-hydraulic pulse motor 20 through a screw drive (not shown).
  • the opcration is such that when the strip Defects Positions 15 15/22 15/12 12/22 12/15/22 Optimum of defects (units 10 cm] yield (units 10 cm)
  • the above table shows the variations of yield and the optinum yield with respect to various combinations of standard or specified sheet lengths.
  • the belt joint weld marks result from the upper belt loop being 206 m long and the lower belt loop being 208 m long, these being the belts 27 and 27' used for the continuous casting of plastic strip sheet material, as illustrated by FIG. 3. It can be seen that by cutting the different lengths of sheets. a substantial improvement in yield is obtained as compared to cutting only the one 1500 mm length. but that between the different lengths of the sheet length combinations there is not a substantial differ ence.
  • FIGS. 5 and 6 in connection with the system of FIG. 1 to exemplify a typical embodiment of the present invention, another embodiment is shown by FIGS. 5 and 6, in connection with the system of FIG. 1 to exemplify a typical embodiment of the present invention.
  • the first piece of apparatus is of the type comprising a set of upper and lower rotary saws 22a and 22b mounted on the shaft of motors 33 carried by carriages 23 guided by the trackways 34 which extend at right angles to the traveling path of the strip 10, which in this instance may be a cast plastic strip having the markings resulting from the belt welds or other imperfections such as air bubbles and in any event requiring severing into commerically required standard lengths of sheets.
  • the trackways 34 are part of a frame 24 which is mounted by a stationary bed 35 on which the frame 24 reciprocates in a direction parallel to the strips traveling direction.
  • the carriages 23 are driven through the cutting cycle by screw-threaded drive shafts 37 which are in screw-threaded engage ment with the carriages 23 and are rotated synchro is to be severed the motors 36 and 20 are controlled. as by the system 38, so that the frame 24 travels with the strip 10 at the latters traveling speed while the motors 36 through the drive shafts 37 move the carriage 23 through its cutting cycle. the saws 22a and 22b separating (by means not shown) to clear the work during the return stroke.
  • the clamps 39 automatically clamp the sheet during the cutting stroke of the saws 22a and 22b and release during the return stroke of these cutting saws.
  • the strip may be supported in any suitable manner as by roller tables suggestively illustrated and which are reciprocative as required to provide clear; ance for the reciprocating motion of the frame 24. An improved strip support arrangement is described hereinafter.
  • the minimum length of the piece that can be cut from the strip 10 with this apparatus is fixed by the length of time required for the frame 24 to go completely through its cycle. as this time is related to the traveling speed of the strip 10. Also, the time required for the return stroke of the carriage 23 is fixed by practical return drives available. Once the cutters 22a and 22b start their cut. Another cut cannot be made by the apparatus until the completion of the cycle. This limits the minimum possible length that can be cut from the strip.
  • a second strip-cutting apparatus is positioned behind the one just described. All of the parts are similar and have been assigned corresponding numerals separately identified by the prime mark
  • the length measuring device represented by the wheel 40 which engaged the strip. driving the pulse transmitter 41 which transmits measuring pulses to the controller 38, provides for properly synchronized operation of the pulse motors and 20', moving the frame 24 at the traveling speed of the work with the frame 24' moving to provide clearance for the movement of the frame 24, if necessary.
  • the pulse motors 36 are activated so that the saws 22a and 22b traverse the strip and make the cut at right angles to the strip, gears (not shown) then being shifted so that continued operation returns the two frames 24 and 24' with the carriages 23 making their return stroke, the clamps 39 clamping and unclamping as required.
  • the frame 24 can be moved initially to provide clearance for recirpocation of the frame 24 and permit it to return.
  • both of the sawing apparatuses can be effected simultaneously under the control of the controller 38 so that pieces are cut having lengths equaling the interspacing of the saws 22a and 22b, and 22a and 2211'.
  • each of the frames 24 and 24' and the equipment they carry can be operated entirely independently of the other. Great flexibility in the operation of the apparatus, as a whole, is possible, regardless of the time required for each to go completely through its sawing cycle.
  • the frame 24' While the frame 24' is moving with the strip and cutting through its cutting stroke, the frame 24 may be returned to its extreme left-hand position where it is ready for another cut. Therefore, if another faulty section of the strip 10 comes along, the first of the apparatuses is ready for immediate operation, going through its full cycle of operation with the frame 24' of the second apparatus being returned so that it is ready for another cut.
  • a diamond cutter for glass contrasting with saws for plastic, plywood, and other products requiring sawing, can be constructed so that the cutter follows a diagonal path having an angularity which in conjunction with correct cutter traveling speed, produces the result that the cutter travels with the strip at the same speed as the latter while traversing the width of the strip. the cutter then requiring to be turned to its starting position to make another cut. In all such instance, the cutter must go through a full cycle, comprising the cutting stroke and the return stroke. before it can make a succeeding cut. After the start of the cycle. the strip continues to travel onwardly both during the cutting and return strokes. which with only one cutting apparatus undesirably limits the minimum length of piece that can be severed from the traw cling strip.
  • the above objectionable feature is advantageously overcome by positioning the second cutting apparatus behind the first. If the cutters of each apparatus are interspaced in the lengthwise direction of the traveling strip, a distance less than the length of the piece that can be cut with only one of the apparatuses, simultaneous opration of the two permits the severing of a piece from the traveling strip which is shorter than either apparatus could provide if operated alone.
  • the cycle of the second or right-hand cutter reciprocating means 24' and 23' may be started at a time severing from the strip, just cut by the first apparatus, a piece having the length predetermined by the markings on the length of the strip approaching the system comprising the two saw apparatuses.
  • FIGS. 5 and 6 may operate on the basis of the as are explained with reference to FIGS. 2 through 4.
  • Sheet cut applied acrylic resin sheet having a thickness of L5 to 6 mm and a width of I400 mm; the travel rate being 3 m/min:
  • Cutter Dia Saw ofa diameter of 300 mm manufactured by Shoda Tekko K. K.', the rotational frequency being 3600 rpm. the forwarding rate being 15 m/min;
  • Oil pressure pulse motor model 3-SSS manufactured by Fujitsu K. K.;
  • Control system pulse motor control device. Fanuc 6l3K, manufactured by FujiK. K.; pulse counter, PP-6D, or the like manufactured by One Sokki K. K.; electronic computer, Melcom 350- manufactured by Mitsubishi Denki;
  • FIG. 7 shows a further embodiment oithe present invention which is suitable for the case where the sheet material is glass sheet.
  • a continuously traveling glass strip 10' is shown as passing under a track 45 of the first apparatus of the system.
  • a carriage 46 mounting a diamond cutter 47. is reciprocatively supported by the track 45, being driven through the described cycle by a motor 48 through the medium of either a sprocket chain and sprocket wheel drive system. or by the carriage being in screw-threaded engagement with a screw-threaded drive 2 shaft or the like, the actual drive mechanism not being shown because it may be conventional.
  • the motor 48 is actuated.
  • the carriage 46 rides along the track 45 until it actuates a limit switch 49, whereupon the drive reverses and brings the carriage through the return stroke of the cycle to a position of rest established by the carriage 46 actuating a return limit switch 50.
  • the angularity of the track 45 is fixed, the apparatus being stationary, and the track extends diagonally for the full width of the strip 10'.
  • the motor 48 may be a previously mentioned electrohydraulic pulse motor. and is represented here as pulse fed via a digital controller 38 fed with digital pulses by a pulse transmitter 51 driven by a roller 52 engaging the traveling glass sheet 10.
  • the controller 38' is also fed with diverse control signals by a computer as shown in the system of FIG. I.
  • the arrangement is such that the carriage 46 with its diamond cutter 47 is driven at a speed causing the cutter to sever the traveling strip 10 right angularly, the carriage eventually actuating the limit switch 49 which via the control system 38' reverses the drive of the carriage and returns the latter until it actuates the return limit switch 50 whereupon the carriage comes to rest.
  • the motor 48 of the type referred to reversal may be effected by shifting a reversing gear train (not shown); if the motor 48 is reversing. it may be reversed.
  • the minimum length of the piece that can be cut from the strip 10' with this apparatus is fixed by the length of time required for the carriage 47 to go completely through its cycle, as this time is related to the traveling speed of the strip 10'.
  • the speed of the cutting stroke is fixed by the relationship between the angularity of the truck 45 relative to the traveling speed of the strip 10', and the time required for the return stroke of the carriage 46 and the diamond cutter 47 is fixed by the limitations of mechanical design consideration.
  • the distance L" between the cutters in the lengthwise direction of the traveling strip 10' is made less than the minimum length of piece that can be severed from the strip by either of the apparatuses alone.
  • Each apparatus is operable through its cutting cycle independently with respect to the other. If under the control of the controller 38' actuated by the pulses from the pulse transmitter 51, the two are operated simultaneously, the minimum length of the piece that can be cut is L, the interspacing between the cutters 47 and 47. This length is shorter than the minimum distance between cuts that either apparatus can make along by two immediate sequential cuts.
  • the motor 48 is actuated, after the initial cut of the cutter 47, with the cutter 47' being at its starting position, that as soon as the cut end of the advancing strip 10' reaches the cutter 47. its motor 48' may be actuated to start its cut, the result being that an extremely small piece may be severed as, for example, to remove an imperfection in the strip 10', of small length in the strips traveling direction.
  • the controller 38' is shown as being fed with a signal from a detector 53 which may be of the lightresponsive type located below the strip 10' and actuated by a light 54 located above the strip 10'. If the strip 10 is not transparent, any other of the known types of signal pickups from traveling strip may be used.
  • an inspector may mark the leading and trailing portions ofa defective part of the strip 10', thus defining a predetermined length, the markings being picked off by the detector 53 and as a signal fed to the controller 38 where it is digested and stored until that portion of the strip reaches the first piece of apparatus which is then automatically actuated so that its cutter 47 severs the strip at the leading mark, the trailing mark serving to actuate the second piece of apparatus with its cutter 47' then severing the strip along the trailing one of the inspectors marks.
  • FIG. 8 schematically shows a severing system improved from the system of FIGS. 5 and 6.
  • conveying means such as roller conveyors are employed for conveying the sheet material from its production stage to its severing stage, and for conveying the strip pieces of the sheet material after severing.
  • the roller conveyors 61 and 62 are respectively arranged at the upstream and downstream portions of the sheet severing apparatuses with respect to the sheets traveling direction.
  • the trailing end of the conveyor 61 arranged at the upstream portion reaches to a location adjacent to the upstream end of the sheet severing apparatuses, while the leading end of the conveyor 62 arranged at the downstream portion, reaches to a location adjacent to the downstream end of the sheet severing apparatuses.
  • Such conveying mechanisms forming a supporting passageway for the traveling strip are advantageously arranged in the system for severing the traveling strip of the sheet material.
  • Reference numerals 63, 70 and 79 illustrate, respectively, such conveying mechanisms arranged between the conveyor 61 and the upstream sheet severing apparatus, between the upstream and downstream severing apparatuses, and between the downstream severing apparatus and the conveyor 62.
  • rollers 64 and 65 of the mechanism 63 are journaled by bearings fixed to the conveyor 63, while roller 66, 67 and 68 are so arranged that they can be moved together with an upstream severing apaparatus when the severing apparatus receprocates in the direction parallel to the sheets traveling direction.
  • these rollers 66, 67 and 68 can be journaled by bearing fixed to the frame 24.
  • a flexible endless belt 69 is composed of a cloth, a cloth-incorporated rubber or a synthetic resin or fiber such as nylon. This endless belt 69 may be composed of one belt or a plurality of transversely interspaced belts.
  • each of rollers 66, 67 and 68 is moved as one part with the upstream severing apparatus, and the other rollers 64 and 65 are stationarily positioned so as to be rotatable. Therefore, though the distance between rollers 64 and 68 and the distance between rollers 65 and 66 are changed, since expansion of the distance between rollers 65 and 66 corresponds to shortening of the distance between rollers 64 and 68 (the reverse charge should naturally occur upon returning of the upstream severing apparatus), the entire length of the belt 69 can always be kept constant. Accordingly, the belt 69 is always spread under the same tension and the sheet is always supported by the conveying mechanism 63 and prevented from falling on the floor. Further. as the belt 69 is driven so that its conveying speed is rendered equal to the speed of the conveyor 6
  • the conveying mechanism 70 has the same fundamental construction as the mechanism 63 and connects both upstream and downstream sheet severing apparatuses. Therefore, the sheet material 10 can be con veyed by the conveying mechanism 70 from the upstream severing apparatus to the downstream severing apparatus without falling on the floor between the two severing apparatuses.
  • rollers 71 and 72 are moved synchronously with the frame 24 of the upstream sheet severing apparatus, and rollers 76, 77 and 78 are moved synchronously with the frame 24' of the downstream sheet severing apparatus.
  • the other rollers 73, 74 and are rotatable at thier respective fixed positions.
  • the mechanism 70 is also provided with an appropriate belt driving means.
  • the conveying mechanism 79 also can convey the sheet material from the downstream sheet severing apparatus to adjacent conveyor 62 disposed behind the downstream sheet severing apparatus.
  • rollers 80, SI and 82 are associated with the frame 24, of the downstream sheet severing apparatus so as to be moved synchronously with the severing apparatus, while the other rollers 83 and 84 are associated with the conveyor 62.
  • the severing apparatus generally has a mechanism for clamping the sheet material by a clamp at the time of transverse cutting.
  • the clamping position is a relatively long distance away from the position where the severing is effected by the saws and in the actual operation, a defect such that finely severed end sections of the sheet material are not obtained, is often observed.
  • FIG. 9 is a front view illustrating the longitudinal sec tion of a saw cover.
  • FIG 10 is a longitudinal sectional elevation showing the cover of FIG. 9.
  • Reference numeral 10' indicates the sheet
  • reference numerals 22a and 22b indicate a set of upper and lower rotary saws.
  • Clamps 86 and 86' are actuated by air cylinders 88 and 88' to clamp the sheet l0. After completion of this clamping operation.
  • saws 22a and 22b are respectively lowered and elevated to positions suitable for transverse cutting and are forwarded transversely in the direction indicated by a rows 91 and 91' to transversely cut the sheet 10.
  • Covers 87 and 87' are formed so that they have structures integrated with clamps 86 and 86', respectively.
  • said covers have no movement relative to the sheet 10 during the transverse movement of the saws and, therefore, there is no fear that the sheet will be damaged by a sliding movement or the like of the strip and the saw cover relative to each other, More specifically, the rotary saws 22a and 22b are lowered, elevated or moved transversely in a long rectangular parallelopiped space formed by the clamps and covers which have a rectangular section.
  • brushes 90 and 90 are provided to enhance the sealing of said cover and absorb the relative movement between the rotary shafts of the saws and the cover.
  • Scraps or chips can be mostly removed by sucking air at a rate of 10 to m/sec via ducts as indicated by reference numerals 93 and 93. If a small amount of air is blown from the end opposite the suction end through pipes as indicated by 92 and 92. the floatation of scraps is promoted and the scraps are easily carried away by the sucked air current, whereby collection of scraps can be greatly enhanced.
  • the downward movement of the sheet is inhibited at the time of transverse cutting and, therefore, a finely cut section can be obtained from the sheet.
  • a suitable material such as a surface-smoothed aluminum plate or plastic plate
  • elevating and lowering movements of the clamps and covers positioned below the sheet which are indicated by 86. 87'. 88' and 89, are not conducted and the highest point of the support 89 is positioned at the same level as that of the lower surface of the sheet.
  • the cutter of the sheet severing apparatus is composed of a pressurized water jet or laser ray (not shown the above described covers 87 and 87' can be used for preventing the water jet from spraying and for protecting an operator from the laser ray.
  • a system for cutting sheet pieces from a traveling strip of sheet material comprising:
  • measuring means for measuring a length of the traveling strip of sheet material said measuring means emitting an electric signal in response to measurement of a length of the traveling strip
  • computing means connected to the length measuring means, the faulty portion detecting means and the presetting means, said computing means carrying out a specified computation comprising confirming the position of each said faulty portion in the traveling strip in response to signals from said length measuring and faulty portion detecting means, detecting each length of each usable longitudinally extending portion between adjacent said confirmed positions of said faulty portion in the traveling strip or between said confirmed positions of said faulty portions and the immediately previous or subsequent severed end of the sheet material, and determining a ratio of numbers of sheet pieces of said at least two different lengths in said presetting means for obtaining an entire combined length which is closest to the length of each said usable sheet portion.
  • said computing means further storing the ratio of numbers of sheet pieces for each said usable sheet portion of the traveling sheet and then sequentially emitting signals, each indicative of a command for initiation of severing of each of said different lengths of sheet pieces from each said usable sheet portion on the basis of said stored sheet number ratio;
  • severing means connected to said computing means for severing sheet pieces from the traveling strip of the sheet material in response to respective said sequential signals indicative of commands from said computing means.
  • each said severing apparatus is provided with means for covering the strip cutter and the sheet portion severed by said strip cutter.
  • each said casing is provided with a brush member for absorbing the relative movement between each said casing and each said severing saw during said cycle of the cutting and return strokes, and supports attached to said casing for supporting the traveling sheet at the time of said cutting stroke of said severing saw.
  • each said casing is provided with an opening for connecting said closed space to a vacuum line whereby said collected scraps and chips are sucked into the vacuum line.
  • said severing means comprises a severing apparatus provided with a frame means extending transversely over the traveling strip of the sheet material and being capable of reciprocating along guide means extending longitudinally on opposite sides and in parallel with the traveling strip of the sheet material, a carriage carrying a strip cutter thereon and being mounted on said frame means to reciprocate at right angles to the traveling strip, and control means responsive to said command signals of said computing means for controlling reciprocating motions of said frame means and carriage so that said cutter carries out a cutting stroke extending diagonally across the traveling strip to sever said strip right angularly, and a return stroke to a position of readiness for a succeeding cycle, and wherein said severing apparatus is provided with means for forming at least a conveying passageway extending over the space formed in the position adjacent to the longitudinally fore or back end of said frame means, said conveying passageways effectuating a smooth conveying of the strip portions approaching said severing

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  • Forests & Forestry (AREA)
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  • Wood Science & Technology (AREA)
  • Shearing Machines (AREA)
  • Sawing (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
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US434065A 1973-01-18 1974-01-17 System for cutting pieces from a traveling strip of sheet material Expired - Lifetime US3892153A (en)

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US4073260A (en) * 1976-04-19 1978-02-14 British Steel Corporation Apparatus for removing cross welds from metal tubes and marking the same
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US4930711A (en) * 1989-01-17 1990-06-05 Krantz America, Inc. Automatic defect cutting assembly for a continuous fabric winder
EP0422610A2 (de) * 1989-10-10 1991-04-17 Hermann Hofmann Verfahren und Verwendung einer Vorrichtung zur Bearbeitung der Oberflächen vom Werkstücken, vorzugsweise Steinen, durch Brennen oder Stocken
EP1114801A2 (de) * 2000-01-07 2001-07-11 Schott Spezialglas GmbH Verfahren zum fortlaufenden Ablängen von Zuschnitten aus einem kontinuierlich bewegten Endlosmaterial und zugehörige Vorrichtung
US6673000B2 (en) * 2000-12-28 2004-01-06 Karl Marback Gmbh & Co. Kg Method and apparatus for separating scrap cuttings from a panel that was punched or cut from a sheet of material and arrangement for producing a panel from a sheet of material
US20080072999A1 (en) * 2006-09-21 2008-03-27 Raute Oyj Method and apparatus for recovering partial sized sheets in veneer production
US20090250497A1 (en) * 2005-05-17 2009-10-08 Judy Kathleen Cox Method and apparatus for separating a pane of brittle material from a moving ribbon of the material
US20110315735A1 (en) * 2010-04-14 2011-12-29 Bottero S.P.A. Unknown
CN102764911A (zh) * 2012-07-19 2012-11-07 莱芜钢铁集团有限公司 定尺锯切系统
EP2574434A1 (de) * 2011-10-01 2013-04-03 IMA Klessmann GmbH Verfahren und Vorrichtung zur Anbringung eines Kantenbandabschnitts
US20150298338A1 (en) * 2012-12-05 2015-10-22 Nissan Motor Co., Ltd. Cutting apparatus and a cutting method for separator of electrical device

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FR2424869A1 (fr) * 1978-05-02 1979-11-30 Trefimetaux Appareillage et procede pour le controle de bandes destinees au decoupage de flans monetaires
DE3517714A1 (de) * 1985-05-17 1987-01-22 Enis Ersue Verfahren zum automatischen zuschneiden von planparallelen werkstuecken, insbesondere aus holz, sowie einrichtung zur durchfuehrung dieses verfahrens
JP5118426B2 (ja) * 2007-09-18 2013-01-16 技研株式会社 押出機による形材の連続製造方法と、その装置
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US4073260A (en) * 1976-04-19 1978-02-14 British Steel Corporation Apparatus for removing cross welds from metal tubes and marking the same
FR2349374A1 (fr) * 1976-04-29 1977-11-25 British Steel Corp Procede et appareil pour enlever des soudures transversales sur un tube metallique
US4603539A (en) * 1982-10-05 1986-08-05 Geimuplast Peter Mundt Gmbh & Co. Kg. Method and apparatus for automatically framing slides in a framing apparatus
US4616542A (en) * 1984-09-07 1986-10-14 Brunette Machine Works, Ltd. Flying bucksaw apparatus
US4693151A (en) * 1985-01-09 1987-09-15 Monarch Marking Systems, Inc. Cutting method and apparatus for stacker
US4930711A (en) * 1989-01-17 1990-06-05 Krantz America, Inc. Automatic defect cutting assembly for a continuous fabric winder
EP0422610A2 (de) * 1989-10-10 1991-04-17 Hermann Hofmann Verfahren und Verwendung einer Vorrichtung zur Bearbeitung der Oberflächen vom Werkstücken, vorzugsweise Steinen, durch Brennen oder Stocken
EP0422610A3 (en) * 1989-10-10 1991-08-28 Hermann Hofmann Process and apparatus for shaping the upper surface of articles, in particular stones, through burning or scabbling
US6722250B2 (en) 2000-01-07 2004-04-20 Schott Spezialglas Gmbh Method for continuously cutting away pieces from a continuously moving endless material
EP1114801A2 (de) * 2000-01-07 2001-07-11 Schott Spezialglas GmbH Verfahren zum fortlaufenden Ablängen von Zuschnitten aus einem kontinuierlich bewegten Endlosmaterial und zugehörige Vorrichtung
EP1114801A3 (de) * 2000-01-07 2001-11-07 Schott Spezialglas GmbH Verfahren zum fortlaufenden Ablängen von Zuschnitten aus einem kontinuierlich bewegten Endlosmaterial und zugehörige Vorrichtung
US6673000B2 (en) * 2000-12-28 2004-01-06 Karl Marback Gmbh & Co. Kg Method and apparatus for separating scrap cuttings from a panel that was punched or cut from a sheet of material and arrangement for producing a panel from a sheet of material
US20090250497A1 (en) * 2005-05-17 2009-10-08 Judy Kathleen Cox Method and apparatus for separating a pane of brittle material from a moving ribbon of the material
US8292141B2 (en) * 2005-05-17 2012-10-23 Corning Incorporated Method for separating a pane of brittle material from a moving ribbon of material
US20130240591A1 (en) * 2005-05-17 2013-09-19 Corning Incorporated Method and apparatus for separating a pane of brittle material from a moving ribbon of the material
US20080072999A1 (en) * 2006-09-21 2008-03-27 Raute Oyj Method and apparatus for recovering partial sized sheets in veneer production
US20110315735A1 (en) * 2010-04-14 2011-12-29 Bottero S.P.A. Unknown
EP2574434A1 (de) * 2011-10-01 2013-04-03 IMA Klessmann GmbH Verfahren und Vorrichtung zur Anbringung eines Kantenbandabschnitts
CN102764911A (zh) * 2012-07-19 2012-11-07 莱芜钢铁集团有限公司 定尺锯切系统
US20150298338A1 (en) * 2012-12-05 2015-10-22 Nissan Motor Co., Ltd. Cutting apparatus and a cutting method for separator of electrical device
US9492939B2 (en) * 2012-12-05 2016-11-15 Nissan Motor Co., Ltd. Cutting apparatus for separator of electrical device

Also Published As

Publication number Publication date
FR2214562A1 (de) 1974-08-19
JPS5249589B2 (de) 1977-12-17
IT1003418B (it) 1976-06-10
BR7400385D0 (pt) 1974-08-22
JPS4996386A (de) 1974-09-12
AU6433274A (en) 1975-07-10
FR2214562B1 (de) 1978-03-10
NL7400568A (de) 1974-07-22
CA1001061A (en) 1976-12-07
DE2402301A1 (de) 1974-07-25
SU740144A3 (ru) 1980-06-05

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