US3748078A - Forming machine with web transport - Google Patents

Forming machine with web transport Download PDF

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Publication number
US3748078A
US3748078A US00235304A US3748078DA US3748078A US 3748078 A US3748078 A US 3748078A US 00235304 A US00235304 A US 00235304A US 3748078D A US3748078D A US 3748078DA US 3748078 A US3748078 A US 3748078A
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United States
Prior art keywords
rotor
stroke
chamber
web
gripping members
Prior art date
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Expired - Lifetime
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US00235304A
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English (en)
Inventor
C Schott
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Gloucester Engineering Co Inc
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Gloucester Engineering Co Inc
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/06—Advancing webs by friction band
    • B65H20/08—Advancing webs by friction band to effect step-by-step advancement of web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/261—Handling means, e.g. transfer means, feeding means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/06—Advancing webs by friction band
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/048—Sheet clamping
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
    • Y10T74/1532—Rack actuator
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/1856—Reciprocating or oscillating to intermittent unidirectional motion

Definitions

  • ABSTRACT In a web forming machine (e.g., with pre-heat oven and die for plastic sheet) the web gripping and transporting members extending along the web (e.g., on a long chain) are advanced by a hydraulic actuated rotor stroking back and forth through a fraction of a revolution, with controlled deceleration of the system by combination of an orifice progressively occluded by the rotor at stroke end and a linkage establishing the motion of the gripping members as dependent upon motion of the rotor in varying ratio, with greatest value near mid-stroke and lesser values near end.
  • the linkage shown is an elongated crank driving a rack which rides about and drives a pinion; preferably the crank extends parallel to the rack at the end of forward stroke and the pivot connecting rack to crank is adjustable to vary [56] References Cited gripping member stroke.
  • a clutch permits movement UNITED STATES PATENTS of the gripping members in only one direction and a 2,674,093 4/1954 s16mer 2261156 UX the clutch during fmwad and disen' 2,758,837 8/1956 Littell et al...
  • the actuator llnkase 2,840,369 6/1968 Burman 226/157 x and extended pp members are movable as a unit 2,940,327 6/1960 Gartner 74/130 to accommodate different web widths.
  • the actuator is 3,067,918 12/1962 Peterson 226/156 formed of a sandwich of plates, a central plate defining 3,079,632 3/ 1963 Peicltil 425/126 X th chamber in which the rotor turns, as well as the stops, and an outer plate defines a fluid orifice which er 0 3,359,600 1211967 O'Brien 6! al.
  • Sheets-Sheet 2 FORMING MACHINE WITII WEB TRANSPORT BACKGROUND OF THE INVENTION This invention relates to machines for repetitively forming articles from webs and more particularly to the web transport part of the machine. It is of particular relevance to long machines used to transport plastic foam through preheat ovens to a periodically acting die.
  • the transport mechanism which advances the web by steps through such machines includes massive elements for gripping the web which must be put in motion and stopped.
  • the transport mechanism is prone to wear and misalignment from the large forces required to start and stop the massive elements and especially so when it is subjected to large acceleration peaks.
  • the objects of this invention include smoothly starting and stopping the web gripping members with their associated drive train, avoiding high acceleration peaks in moving the web, and minimizing the wear and misalignment of the web advancing mechanism, all with machine elements of simple and durable construction.
  • the invention features in a forming machine as mentioned above a hydraulic rotary actuator having a housing and a rotor mounted therein for reciprocating rotation through forward and backward strokes of a fraction of a revolution, the rotor and the housing coacting to define a chamber of variable volume diminishing as the rotor advances through a. stroke, the actuator including a passage connected to conduct fluid relative to the chamber as therotor advances, the passage having an orifice communicating'with thechamber, which orifice, duringa terminal fraction of the stroke, is progressively occluded: by therotor, thereby progressively increasing theflowresistance to the fluid: to decelerate the rotor, and a linkageconnected to and driven in reciprocating motion.
  • a preferredembodiment features anzelongated crank affixed to the rotor, a pinion with axis parallel to that of the rotor connected to drive the gripping members, a rack engaging the pinion and a pivot connecting the crank to the rack, the crankbeing affixed to the rotor so as to extend parallel to the rack when therotor is at the end of its forward-stroke and the. pivot being adjustable in distance fromthe rotational axis of the rotor to vary the length of the linkage stroke.
  • the preferred'embodiment further features a shaftsynchronously driving the gripping members and-a clutch connecting the pinion to theshaft and acontroller to operate the rotary actuator and the clutch and connected to engage the clutch during the, forward stroke of-the rotor and to disengage the clutch duringtheback stroke of the rotor.
  • the actuator and drive train to drive the gripping members at one of the sides wherein a chamber is defined in part by a face of one of the outer plates, this face having a slot sunk therein to provide the exhaust passage and orifice.
  • a further feature of the actuator in the preferred embodiment is that the chamber is in part defined by a cylindrical surface passing through the central plate and the orifice is in part defined by the intersection of the cylindrical surface with one of the parallel faces of the central plate.
  • a second passage communicating with the chamber is also included, this passage positioned to provide unimpeded discharge of fluid from the chamber during its first fraction of stroke and to be blocked by the rotor during a subsequent fraction of stroke.
  • the actuator of the preferred embodiment further features a second chamber similar to the first with correspondingly disposed exhaust passages and orifice, the first and second chambers being alternately operative for forward and backward strokes of the rotor.
  • FIG. 1 shows in elevation a web forming machine incorporating the invention.
  • FIG. la shows the same machine in plan.
  • FIG. 2 shows a portion of the web forming machine shown in FIG. 1 in perspective view to show the invention in greater detail.
  • FIG. 3 shows, in perspective view and with portions cut away, the rotary actuator shown in FIG. 2.
  • FIG. 4 shows a cross-sectional view taken along the section 44 of FIG. 3 to reveal further details of the apparatus.
  • FIG. 5 shows on an enlarged scale details of a controllir'igorifice of the actuator shown in FIG. 3.
  • web forming machine 10 includes web dispenser 6, softening oven 8, die frame 18 and bed 12 supporting web 14.
  • Forming die 16' is supported for reciprocating motion. on frame 18 to form web portions, e.g., to form complete egg cartons from a continuous length of polystyrene foam sheet having 'a width of 40 inches and a thickness of oneeighth inch.
  • Web transport mechanism 30, shown more particularly in FIG. 2 includes endless chain gripping members 32 gripping web 14 along one of its edges and similar endless chain gripping members 34 gripping web 14 along its other edge.
  • Gripping members 32 and 34 extend through oven 8 and past die 16, over alength L of, e.g., 20 feet, andare generally supported by chain support bases 50 and 52 respectively.
  • Bases 50; 52 are supported on toothed shafts 53 and may be positioned bymovement of pinion gears 55 affixed to shafts 57' to accommodate webs of various widths.
  • Gripping members 32 are driven by sprockets 36 connected by short shafts to mutually engaged gears 38- which are in turn driven by drive gear 40 keyed to shaft 42 to permit axially sliding of gear 40'along shaft 42.
  • gripping members 34 are driven by sprockets 44 connected through short shafts to gears 46.
  • Drive gear 48 affixed to shaft 42 drives gears 46.
  • Rotary actuator 60 is mounted on base 52 and actuates linkage 61 including crank 62, pivot 64, which is adjustable inslot 66 of crank 62, and rack 68, which is maintained in engagement with pinion 70 by keeper 72 and is'connected to crank 62 at pivot 64.
  • I-Iydraulically operated clutch 74 alternatively engages pinion 70 to shaft 42 or permits pinion 70 to rotate freely about shaft 42.
  • Hydraulic controller 76 of conventional design provides pressured hydraulic fluid to rotary actuator 60 through conduits 78 and 80 and to hydraulically operated clutch 74 through conduit 82.
  • Base 52 together with shaft 42, drive gear 48, sprockets 44, chain gripping members 34, gears 46, actuator 60, rack 68, pinion 70, and clutch 74 supported thereon, is slidable as a unit to permit motion for adjustment to webs of distinct widths. Adjustment of pivot 64 in slot 66 provides for different stroke lengths as desired to obtain different increments of web advance.
  • rotary actuator 60 has a housing composed of center plate 100 and outer plates 102, 104. Plates 100, 102 and 104 are fastened together in a sandwich-like construction with faces 99 of plate 102 and face 101 of plate 100 pressed together and sealed by gasket 103 and with face 105 of plate 100 and face 106 of plate 104 pressed together and sealed by gasket 107.
  • Central plate 100 has cavity 99, a portion 108 of the cavity being cylindrical and another portion 110 being planar.
  • Rotor 112 is affixed to shaft 114 which is in turn journalled in outer plates 102 and 104.
  • Rotor 112 has vane 116 extending radially outward and supporting surface 118 in close proximity to surface portion 108 of central plate 100 and with side surfaces 117 and 119 in close proximity to faces 106 and 99 respectively.
  • Surface portions 110 serve as positive rotor stops and are situated to permit rotor 1 12 to rotate through 180".
  • Rotor 112 with its vane 116 together with surface portions 108 and 110 of central plate 100 and the faces 106 and 99 define chamber 120 appearing to the left as seen in FIG. 3 and chamber 122 appearing on the right.
  • Each of chambers 120 and 122 has a volume that is variable, dependent on the position of rotor 112.
  • Duct 130a communicates (unless blocked by vane 116) with chamber 120, and corresponding duct 130b similarly communicates with chamber 122.
  • Slots 132a and 132b are sunk into face 99 of outer plate 102. With the actuator assembled, slots 132a and l32b communicate respectively with chambers 120 and 122, as shown particularly with respect to slot 132a and chamber 120 in FIGS. 4 and 5. Slot 132a also communicates through holes 134a and 136a to duct 130a, as shown more particularly in the cross-section of FIG. 4. Slot 132b communicates in a similar manner to duct 130b although the intermediate connecting holes cannot be seen in FIG. 3 because of the removal of portions of the structure. Slot 132a therefore provides an exhaust passage for the flow of hydraulic fluid out of chamber 120 through the orifice 139a (see FIG.
  • slot l32b provides a corresponding passage and orifice for chamher 122.
  • the cavity in central plate 100 has a diameter of 6 in. in its circular portion, and a length of 3 in. in the direction of the rotor axis.
  • the edge portion 144a of orifice 1390 is 0.090 in.; edge portion 142a is 0.030 in.; and edge portion 140a is 0.25 in.
  • Pivot 64 is positioned at its greatest extension in. and at its least extension 3 in. from the axis of rotor 112. Pinion has a pitch diameter of4 in.
  • Drive gears 40 and 48 have pitch diameter of l l in. Reflecting these dimensions, a single stroke of the advancing mechanism would advance the web at most 55 in. and at least 16.5 in. depending on the position of pivot 64.
  • controller 76 The operation of the web transport mechanism is coordinated by controller 76 with the movement of die 16 so that the web is moved forward when the die is open. Taking up the cyclical operation at the point where the web is to be moved forward, vane l 16 is to the extreme right as viewed in FIG. 3 and is resting against surface 110. Crank 62 is extended straight down to be parallel to rack 68, which is in its position of extreme extension. Controller 76 initiates the web advance step by directing hydraulic fluid through conduit 82 to engage clutch 74, directing fluid through conduit into duct 130b and opening conduit 78 from duct 130a to permit discharge to a hydraulic sump. With vane 116 in its extreme rightward position, FIG.
  • Hydraulic fluid continues to flow through duct 130b into chamber 122 which is steadily increasing in volume while at the same time hydraulic fluid flows out of chamber 120, which is diminishing in volume, through duct 130a.
  • crank 162 is rotated first rearward (arrow A FIG. 2) and then upwards. Initially the motion of crank 62 causes rack 68 to swing around pinion 70 without causing much rotation of pinion 70. As the rotation of crank 62 progresses, however, rack 68 is driven upwards causing rotation of pinion 70.
  • controller 76 permits the discharge of hydraulic fluid through conduit 82 to disengage clutch 74 and allow free rotation of pinion 70 on shaft 42. Fluid is also directed through conduit 78 to duct 130a while flow from duct l30b through conduit 80 is opened to the hydraulic sump.
  • the rotor 112 of actuator 60 is thereby returned to its initial position with acceleration and braking in a manner analogous to the corresponding effects during the forward stroke, except that the drive beyond the now disengaged clutch is not placed in motion.
  • the vane 116 has come to rest againstsurface portion 110 thecycle is completed. Repeated operations of the cycle therefore ad vance the'web stepwise through the forming machine.
  • the smooth action of the mechanism in starting and stopping the web and its drive train without accelerational peaks minimizes wear and misalignment in the apparatus;
  • the cooperating decelerating features as described avoid criticality of synchronism of the die with the transport mechanism.
  • the die may'start to close upon the web even before the rotor reaches the positive stop because the special linkage ensures that virtually no travel of the gripping members will occur during terminal movement of the rotor.
  • a forming machine for acting progressively upon an elongated web comprising a periodically acting forming die and web transport mechanism advancing said web periodically into said die at times when said die is open, said transport mechanism including extended gripping members extending along the length of the web and means for advancing said gripping members
  • said advancing means comprises a hydraulic rotary actuator having a housing and a rotor mounted therein rotatable between stops through forward and backward strokes of a fraction of a revolution, said rotor and said housing coacting to define a chamber the volume of whicn varies as said rotor advances through a stroke
  • said actuator including a passage connected to conduct fluid relative to said chamber as said rotor advances, said passage having an orifice communicating with said chamber, which orifice, during a terminal fraction of said stroke, is progressively occluded by said rotor, thereby progressively increasing the flow resistance to the fluid of said chamber to smoothly decelerate said rotor, and linkage connected to and driven in reciprocating motion through forward
  • the forming machine of claim 1 comprising an elongated pre-heat oven and a forming die adapted to form articles from a plastic web, said web gripping members extending throughout the combined length of said oven and forming die, and constructed to grip and transport said plastic web.
  • said linkage including an elongated crank affixed to said rotor, a pinion with axis parallel to that of said rotor connected to drive said gripping members, and a rack engaging said pinion and a pivot connectingsaid crank to said rack.
  • crank being affixed to said rotor to extend parallel to said rack when said rotor is at the end of its forward stroke.
  • the device as claimed'in claim 9 including a drive gear with a shaft affixed thereto, supported on said base and engaged to drive said one gripping member.
  • said housing comprising a central and two outer plates with parallel faces assembled sandwich-like, said chamber being defined in part by a face of one of said outer plates, said face having a slot sunk therein to provide said passage, said orifice being in part defined by the intersection of said slot with the face of said central plate.
  • said chamber being in part defined by a cylindrical surface passing through said central plate, said orifice being in part defined by the intersection of said cylindrical surface with one of the parallel faces of said central plate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)
  • Advancing Webs (AREA)
  • Making Paper Articles (AREA)
  • Discharge By Other Means (AREA)
US00235304A 1972-03-16 1972-03-16 Forming machine with web transport Expired - Lifetime US3748078A (en)

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US23530472A 1972-03-16 1972-03-16

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JP (1) JPS494754A (enrdf_load_html_response)
CA (1) CA994509A (enrdf_load_html_response)
DE (1) DE2313208A1 (enrdf_load_html_response)
FR (1) FR2176152B1 (enrdf_load_html_response)
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836309A (en) * 1973-08-30 1974-09-17 A Thiel Thermal forming apparatus
DE2827885A1 (de) * 1978-06-24 1980-01-17 Applic Plastique Mec Elec Vorschubantrieb fuer eine maschine zum herstellen von tiefgezogenen gegenstaenden aus thermoplastischer kunststofffolie
US4194663A (en) * 1978-07-24 1980-03-25 Leesona Corporation Hydromechanical plastic web indexing system for synthetic plastics thermoforming machinery
US4475881A (en) * 1982-09-14 1984-10-09 Placon Corporation Thermoforming of plastic sheet material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS568624Y2 (enrdf_load_html_response) * 1975-04-18 1981-02-25
JPS54121675U (enrdf_load_html_response) * 1978-02-15 1979-08-25

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674093A (en) * 1951-12-21 1954-04-06 Goodman Mfg Co Conveyer drive and booster for shuttle cars
US2758837A (en) * 1953-03-18 1956-08-14 Littell Machine Co F J Hydraulically powered rack and pinion feeding mechanism
US2840369A (en) * 1956-02-06 1958-06-24 Progressive Machinery Corp Stock-feeding apparatus
US2940327A (en) * 1954-04-15 1960-06-14 Sylvania Electric Prod Traying device
US3067918A (en) * 1959-12-21 1962-12-11 Peterson Carl Roller feed drive mechanism
US3079632A (en) * 1960-05-16 1963-03-05 Federal Mogul Bower Bearings High speed molding machine
US3134323A (en) * 1962-09-17 1964-05-26 Faustel Inc Web printing mechanism with intermittent feed
US3237242A (en) * 1963-05-15 1966-03-01 Nat Cleveland Corp Roll-fed thermoforming machine
US3359600A (en) * 1965-07-22 1967-12-26 Kirkhof Mfg Corp Sheet preheating and forming method and apparatus

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674093A (en) * 1951-12-21 1954-04-06 Goodman Mfg Co Conveyer drive and booster for shuttle cars
US2758837A (en) * 1953-03-18 1956-08-14 Littell Machine Co F J Hydraulically powered rack and pinion feeding mechanism
US2940327A (en) * 1954-04-15 1960-06-14 Sylvania Electric Prod Traying device
US2840369A (en) * 1956-02-06 1958-06-24 Progressive Machinery Corp Stock-feeding apparatus
US3067918A (en) * 1959-12-21 1962-12-11 Peterson Carl Roller feed drive mechanism
US3079632A (en) * 1960-05-16 1963-03-05 Federal Mogul Bower Bearings High speed molding machine
US3134323A (en) * 1962-09-17 1964-05-26 Faustel Inc Web printing mechanism with intermittent feed
US3237242A (en) * 1963-05-15 1966-03-01 Nat Cleveland Corp Roll-fed thermoforming machine
US3359600A (en) * 1965-07-22 1967-12-26 Kirkhof Mfg Corp Sheet preheating and forming method and apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836309A (en) * 1973-08-30 1974-09-17 A Thiel Thermal forming apparatus
DE2827885A1 (de) * 1978-06-24 1980-01-17 Applic Plastique Mec Elec Vorschubantrieb fuer eine maschine zum herstellen von tiefgezogenen gegenstaenden aus thermoplastischer kunststofffolie
US4194663A (en) * 1978-07-24 1980-03-25 Leesona Corporation Hydromechanical plastic web indexing system for synthetic plastics thermoforming machinery
US4475881A (en) * 1982-09-14 1984-10-09 Placon Corporation Thermoforming of plastic sheet material

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CA994509A (en) 1976-08-10
DE2313208A1 (de) 1973-09-27
JPS494754A (enrdf_load_html_response) 1974-01-16
FR2176152A1 (enrdf_load_html_response) 1973-10-26
GB1396477A (en) 1975-06-04
FR2176152B1 (enrdf_load_html_response) 1977-02-04

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