US3564979A - Bottom closing apparatus for closing the bottom flaps of paper bags and the like - Google Patents

Bottom closing apparatus for closing the bottom flaps of paper bags and the like Download PDF

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Publication number
US3564979A
US3564979A US755674A US3564979DA US3564979A US 3564979 A US3564979 A US 3564979A US 755674 A US755674 A US 755674A US 3564979D A US3564979D A US 3564979DA US 3564979 A US3564979 A US 3564979A
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United States
Prior art keywords
bag
discs
flap
closing
spaced
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Expired - Lifetime
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US755674A
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English (en)
Inventor
Herbert H Weber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HG Weber and Co Inc
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HG Weber and Co Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/004—Closing bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • B31B2150/001—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom
    • B31B2150/0012—Flexible containers made from sheets or blanks, e.g. from flattened tubes with square or cross bottom having their openings facing in the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/02—Feeding or positioning sheets, blanks or webs
    • B31B70/022—Holders for feeding or positioning sheets or webs
    • B31B70/024—Rotating holders, e.g. star wheels, drums

Definitions

  • the bottom closing apparatus includes a series of coaxial and circumferentially spaced bottom closing disks rotatably mounted in radially outwardly spaced relation with respect to the periphery of the bag forming drum, to rotatably move in the same direction about axes spaced radially of the surface of the drum into interdigitating relation with respect to each other.
  • the bottom closing disks each travel at a higher rate of speed than the speed of rotation of the drum and have flap closing fingers extending closely adjacent the periphery of the drum to accommodate a first set of fingers to get behind and lift the trailing bottom flap of the bag into an upward position to accommodate the second series of fingers to overtake the bottom flap when in a straight upward position and fold it downwardly over the previously folded trailing bottom flap of the bag into a closed position.
  • a bottom flap closing apparatus for paper bags and the like arranged to handle a far wider range of lengths of flaps than has heretofore been considered possible, by the use of two series of circumferentially spaced bag closing discs spaced radially of the periphery of the bag forming drum and driven in the same direction at a higher rate of speed than the speed of travel of the bag forming drum, to more efficiently get behind and pick up the flap and then move the flap from its trailing position to a straight up position and then downwardly over the bottom of the bag into a closed position.
  • a principal object of the present invention is to provide a simplified and more efficient apparatus for closing the bottom flaps of paper bags and the like in cooperation with the bag fonning drum of a bag marking machine, and arranged with a view toward more efficiently closing a wider range of lengths of bottom flaps of paper bags than with former bag closing methods and apparatus.
  • Another object of the invention is to simplify the bottom flap closing operations of paper bags on bag making machines by providing two series of bag closing discs cooperating with a power driven bag forming drum, and spaced radially therefrom and moving into interdigitating relation with respect to each other at the same rates of speed, and at a rate of speed as the speed of travel of the drum, to move a first set of discs to get behind and pick up the bottom flap of the bag and move the flap into a generally upright position, to then be overtaken by a second series of discs in advance of the first series and moved downwardly into a closed position.
  • FIG. 1 is a diagrammatic view in side elevation diagrammatically showing a portion of the bag forming drum of a bag making machine with the bottom flap closing discs in cooperation therewith adjacent the stripping station of the machine.
  • FIG. 2 is a partial fragmentary horizontal sectional view taken through a second series of bottom flap closing discs and fragmentarily showing the first series of discs interdigitating relation with respect thereto.
  • FIG. 1 of the drawings I have diagrammatically shown a portion of a bag forming drum of a typical bag forming machine and have shown a bag 11 being stripped from the drum'10 and having a trailing bottom flap l2 folded over the bottom of the bag over a previously folded trailing flap (not shown). I have also shown the positions of the bottom flap 12 when being folded from its trailing to its closed position, overlapping the bottom of the bag.
  • the forming drum 10 is mounted for rotation about a horizontal axis and is driven at a predetermined rate of speed to carry a bag to be cut off, scored, formed, glued and to fold the trailing and glued bottom flap of the bag backwardly along the bottom previously folded leading flap of the bag, to be sealed thereto.
  • the bag blank is clamped to the drum by releasable circumferentially spaced leading and trailing clamps at each station of the drum, releasing the formed bag as stripped from the drum.
  • clamps may be of any conventional form commonly used on bag making machines and are no part of the present invention so need not be shown or described in detail.
  • FIGS. 1 and 2 A first series of spaced bottom flap closing discs 13 is shown in FIGS. 1 and 2, as being mounted in side by side relation on a transverse shaft 15, spaced radially of the periphery of the drum 10 and rotatably driven to drive the discs 13 at a higher peripheral speed than the speed of rotation of the drum 10 and in an opposite direction than the direction of rotation of said drum, but in the same direction as the direction of travel of said drum.
  • a second series of bottom closing discs 16 is shown as being mounted on a transverse shaft 17 spaced circumferentially of the shaft 15 and radially of the periphery of the drum I0 and rotatably driven in the same direction and at the same rate of speed as the shaft 17.
  • a plurality of strippers 19 having stripper plates 20 extending into grooves 21 formed in the surface of the drum 10 and conforming generally to the peripheries of the discs 16, to strip the bag from the surface of the drum 10 with the bottom flap 12 in a closed position.
  • the bottom fiap 12 is held in a closed position by the peripheries of the second series of bottom closing discs 16 and is retained in a closed position as stripped from the drum 10.
  • the bag is advanced along the stripper plates 20, over idlers 22 disposed between said stripper plates and under a series of laterally spaced transfer belts 23.
  • the belts 23 turn about direction changing idlers 24 disposed between the bottom flap closing discs 16.
  • the belts 23 cooperate with a series of similar transfer belts 25 turning about direction changing idlers 26 adjacent the discharge ends of the stripper plates 20, to form a traveling nip along which the bag is conveyed with its bottom flap in a closed position.
  • the belts 25 may be driven at the peripheral speed of the bag closing drum 10 while the belts 23 may be driven at a slightly higher rate of speed, to effect an overtravel of the bottom flap of the bag, to maintain the bottom flap in its closed position.
  • FIG. 2 I have shown a generally horizontal sectional view taken through the second series of bottom closing discs 16 and have shown these discs mounted on the transverse drive shaft 17.
  • Each disc 16 has a hub 27, shown in FIG. 2 as being split, in which the split portion of the hub is drilled to accommodate clamping of the hub to the shaft 17 to be driven therefrom.
  • a key or pin (not shown) may be provided for each disc to maintain the disc in position on the shaft.
  • the shaft 17 is journaled in side frame members 30,30 of a frame 31 of the bag making machine on antifriction bearings 33,33 and extends beyond one side frame member 30 and has a spur gear 35 keyed or otherwise secured to the projecting end thereof.
  • the spur gear 35 is shown as driven by a spur gear 36, which may be driven by the bag forming a drum 10 through a suitable gear train (not shown) in any well known manner, to effect a drive to the bottom closing discs 16 at a higher rate of speed than the speed of travel of the bag forming drum 10, to accommodate the discs 16 to get behind the bottom flap 12 of the bag as raised by the discs 13, and to fold the flap over the traveling bag into its closed position as it is stripped from the drum 10 (FIG. 1).
  • a transfer cylinder 37 Journaled on the shaft 17 inwardly of the side plates 30 and spaced outwardly of each side of the outer end bottom closing discs 16 is a transfer cylinder 37 clamped to a drive sleeve 39 journaled on the shaft 17 on bearings 40.
  • the transfer cylinders 37 are rotatably driven at the same peripheral speed as the peripheral speed of the drum 10 and engage the opposite side edges of the bag on the idlers 22 and convey the bag along the stripper plates 20 and into the space between the transfer belts 23 and 25.
  • the transfer cylinders 37 have webs 41 partially cut away to counterbalance the offcenter weights of the bottom closing discs 16 and have pressure pads 43 extending inwardly therefrom exerting pressure on the leading corners of the bottom of the bag, to maintain the leading flap of the bottom in its closed or tucked position as the trailing bottom flap 12 is folded over the previously folded trailing flap by the bottom closing discs 16.
  • a gear train 44 driven from a spur gear 45 keyed or otherwise secured to the shaft 17, is provided to drive the associated transfer cylinder at the peripheral speed of the bag forming drum 10.
  • the shaft 15 of the first series of bottom flap closing discs 13 is journaled in the side frame members 30 of the frame 31 of the bag making machine, and is driven from the bag forming drum, to rotatably drive the bottom flap closing discs 13 in the same direction and at the same rate of speed as the bottom flap closing discs 16.
  • the bearing support and drive for the shaft 15 is the same as that for the shaft 17 and the bottom flap closing discs 13 are mounted on the shaft 15 in the same manner the discs 16 are mounted on the shaft 17, so a detailed description thereof need not be repeated.
  • the shaft 15, however, does not have bag transfer cylinders mounted thereon on the outer sides of the bottom flap closing discs 13, since the bag is not transferred by the strippers 20 until the back flap is folded down over the bag by the bottom flap closing discs 16.
  • each series of discs are of the same construction and are positioned on their respective shafts in the same phase relation with respect to each other.
  • the discs 13 are angularly positioned on the shaft 15 to first get behind the trailing end of the bottom flap and to raise the flap, to be picked up by the discs 16 when the flap is in an upright position.
  • Each disc 13 has a chordal surface 47 forming a pick up finger of sufficient length to pick up a trailing bottom flap of the bag and to raise the flap in position to be picked up by a corresponding chordal surface or pick up finger 48 of an interleaving disc 16.
  • the pickup finger 47 terminates at its outer end, adjacent the periphery of the disc into a circumferential peripheral surface 49 formed on an arc struck from the axis of rotation of the shaft 15, and shown as extending for a greater portion of the periphery of the bottom flap closing disc 13.
  • the peripheral surface converges from the circumferential surface 49 into a receding peripheral surface 50 converging toward the shaft 15 as it extends to the chordal surface or pickup finger.
  • the spacing between the circumferential surface 49 of the disc 13 and the periphery of the drum is sufficient to accommodate the bag with its trailing bottom flap to extend thereunder and to accommodate the pick up finger to hinge or fold the flap into an upright position, to be picked up by the pick up finger 48 of the bottom flap closing disc 16.
  • chordal surface or finger 48 of the bottom closing disc 16 terminates into a circumferential surface 51 struck from an arc coaxial with the axis of rotation of the shaft 17 and of the same radius as the radius of the arc of the circumferential peripheral surface 49 of the bottom flap closing disc 13.
  • the circumferential surface 51 serves to maintain the bottom flap in the closed position shown in FIG. 1 as it passes along the stripper plates 20 and over the rollers 22 and to hold the flap in this position as it passes under the transfer belts 23.
  • FIG. 1 the bottom flap closing discs 13 are shown in solid in the positions they will assume when the bottom flap of the bag is in an upright position, in position to be picked up by the fingers 48 of the bottom flap closing discs 16.
  • the discs 16 are shown by solid lines as angularly positioned in trailing relation with respect to discs 13 to take over the bottom flap closing operation as the bottom flap is moved into the upright position l2fshown in FIG. 1.
  • the finger 47 In picking up the bottom flap the finger 47 is shown in a broken line position 47a moving into position to overtake the bottom flap in position 12a and get behind said bottom flap and then raise the bottom flap through positions 12b, 12c, 12d, 12c and 12f and to continue the hinging of the bottom flap until it can be picked up by the finger 48 and moved into a closed position through positions 12g, 12h, 12i, 12j, 12k and 12! to then be engaged by the circumferential peripheral surfaces 51 of the bottom flap closing discs 16 and retained thereby in its closed position, as the bag is transferred along a stripper surface 20 of the stripper 19 under the transfer belts 23 and over the transfer belts 25 into the nip between said belts.
  • a first and second series of bottom flap closing discs 13 and 16 rotatably driven in interdigitating relation with respect to each other at higher rates of speed than the speed of travel of the bag forming drum l0 rotate in such relation with respect to the bag forming drum that the first series of discs will first overtake the trailing bottom flap 12a of the bag 11 traveling along said bag forming drum and then hinge the flap upwardly as it is traveling along the drum and that as the bottom flap is in an upright position 12f, the second series of bottom flap closing discs 16 will engage and fold the bottom flap over its previously folded leading flap into its closed position to be carried away and sealed into its closed position While I have herein shown and described one form in which the invention may be embodied, it may readily be understood that various variations and modifications in the invention may be attained without departing from the spirit and scope of the novel concepts thereof.
  • first bottom flap closing disc a first bottom flap closing disc, a second bottom flap closing disc spaced in advance of said first bottom flap closing disc, said first and second bottom flap closing discs moving in interdigitating relation with respect to each other at higher rates of speed than the speed of travel of said drum, means mounting said first and second bottom flap closing discs in spaced relation with respect to the traveling surface of said bag forming means and in spaced relations with respect to each other, to space said second flap closing discs ahead of said first flap closing discs, said discs each having a pick up finger extending to a position adjacent the periphery of said traveling surface and driven to travel in the same general direction as the direction of travel of said traveling surface and at a higher rate of speed than the speed of travel of said traveling surface, whereby a first disc may overtake and get behind a bag bottom flap on said traveling surface and move the flap into a generally upright position and a second of said discs may overtake the flap when in an upright position and fold the flap downwardly along the traveling bag into a closed position, 2.
  • a bag making machine in accordance with claim 1, wherein the means mounting said discs in spaced relation with respect to said traveling surface and in spaced relation with respect to each other comprises parallel spaced shafts extending transversely of said drum and parallel to the surface of said drum, and wherein drive means are provided for driving said shafts and discs at higher rates of speed than the speed of travel of said traveling surface.
  • drive means are provided for driving said shafts and discs at higher rates of speed than the speed of travel of said traveling surface.
  • each bottom flap closing disc has a circumferential peripheral portion extending for a portion of the periphery thereof and spaced from the surface of said traveling surface and has a finger extending chordally of said circumferential surface and inwardly therefrom, and wherein the fingers of said first and second discs are angularly spaced with respect to each other to accommodate a first finger to overtake and move behind the trailing end of a bottom flap and raise it into an upright position to then accommodate the finger of a second disc in cooperation with the peripheral portion thereof to fold the bottom flap downwardly along the bottom of the bag and to retain the flap in this position to be adhesively secured thereto.
  • each bottom flap closing disc has a circumferential peripheral portion extending for a portion of the periphery thereof and spaced from the surface of said traveling surface and has a finger extending chordally of said circumferential surface and inwardly therefrom, and wherein the fingers of said first and second discs are angularly spaced with respect to each other to accommodate a first finger to overtake and move behind the trail
  • circumferential periphery terminates at one end thereof into advance flap folding finger extending generally chordally of the circumferential peripheral por tion thereof
  • discs on the second shaft are spaced angularly with respect to the discs on the first shaft, to come into folding cooperation with the bottom flap of the bag as said flap is moved to a generally upright position by said first bottom flap closing discs and to hinge the flap downwardly along the bottom of the bag in cooperation of the peripheral portions thereof.
  • traveling surface is a bag forming drum
  • a stripper underlies said discs on said second shaft conforms generally to the peripheral surface thereof to complete the back flap closing operation as the bag is stripped from said bag forming drum and wherein spaced transfer belts having a space therebetween extend in advance of said stripper for transferring the bag with the back flap in closed relation for further operations.
  • drive means are provided for said transfer cylinder to drive said transfer cylinders at the speed of travel of said bag forming drum and progress the bag along said stripper into the nip between said transfer belts.

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US755674A 1968-08-27 1968-08-27 Bottom closing apparatus for closing the bottom flaps of paper bags and the like Expired - Lifetime US3564979A (en)

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US75567468A 1968-08-27 1968-08-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010598A (en) * 1975-02-27 1977-03-08 F. L. Smithe Machine Company, Inc. Device for folding the closure flap of envelopes

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1567437A (en) * 1924-01-23 1925-12-29 Valve Bag Company Of America Bottom closure for paper-bag machines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1567437A (en) * 1924-01-23 1925-12-29 Valve Bag Company Of America Bottom closure for paper-bag machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010598A (en) * 1975-02-27 1977-03-08 F. L. Smithe Machine Company, Inc. Device for folding the closure flap of envelopes

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DE1943271A1 (de) 1970-03-26

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