EP0037841B1 - Machine pour plier des sacs et procédé pour plier un matériau en feuille flexible - Google Patents

Machine pour plier des sacs et procédé pour plier un matériau en feuille flexible Download PDF

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Publication number
EP0037841B1
EP0037841B1 EP80101941A EP80101941A EP0037841B1 EP 0037841 B1 EP0037841 B1 EP 0037841B1 EP 80101941 A EP80101941 A EP 80101941A EP 80101941 A EP80101941 A EP 80101941A EP 0037841 B1 EP0037841 B1 EP 0037841B1
Authority
EP
European Patent Office
Prior art keywords
rolling
movable
section
rolling cage
machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80101941A
Other languages
German (de)
English (en)
Other versions
EP0037841A1 (fr
Inventor
John Burnett Coast
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.)
Union Carbide Corp
Original Assignee
Union Carbide Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Union Carbide Corp filed Critical Union Carbide Corp
Priority to EP80101941A priority Critical patent/EP0037841B1/fr
Priority to DE8080101941T priority patent/DE3066239D1/de
Publication of EP0037841A1 publication Critical patent/EP0037841A1/fr
Application granted granted Critical
Publication of EP0037841B1 publication Critical patent/EP0037841B1/fr
Expired legal-status Critical Current

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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
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • 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
    • B31B70/74—Auxiliary operations
    • B31B70/92—Delivering
    • B31B70/98—Delivering in stacks or bundles
    • B31B70/982—Delivering in stacks or bundles involving folding of the bags

Definitions

  • the present invention relates to a machine for flatten-folding flexible sheet material such as plastic bags and more particularly to a folding machine of the type which winds the bag into a roll and discharges the rolled bag in a flatten-folding state, as well as to a method of folding flexible sheet material.
  • Folding machines are known (US-A-3 671 033, US-A-3 918 698, US-A-4 183 515) which comprise a rolling section which forms a curved moving surface disposed a minimum of 270° of a circle for winding the material into a roll.
  • the rolling section is divided into at least two laterally separated sub-sections which are spaced apart to form an open unobstructed area therebetween for removing the rolled bag.
  • Each sub-section is formed from a set of horizontally disposed parallel drive rollers whose axes are disposed a minimum of 270° of a circle to present on their inward side and within each sub-section a moving surface throughout at least a substantial portion of the 270° of a circle for driving the material into a roll.
  • the rollers are arranged to form, in effect, a cul-de- sac having an entrance opening adapted for receiving the material. After the bag is rolled, it is removed through the open area between the laterally spaced sub-sections.
  • the rolled articles such as rolled plastic bags
  • a pin and pneumatic cylinder which engages the longitudinal center of the rolled plastic bag at the space provided between the laterally separated sub-sections of the rolling apparatus.
  • the rolled article is then delivered, centrally folded to a set of nip rolls where it is flattened.
  • a jet of compressed air delivered from a nozzle folds a rolled plastic bag centrally between the laterally supported sub-sections of the rolling apparatus.
  • the jet is in the form of an air knife which forces the bag into a pair of nip rolls which serve to deliver the rolled bag in a flattened-folded condition.
  • an enlarged open area for the withdrawal of the bags is provided between the laterally spaced sub-sections, and the bags are withdrawn from the rolling section in a direction substantially transverse to the direction of entry over first flat surfaces of the entrance openings of the sub-sections located on opposite sides of the open area in a common plane, wherein each of the entrance openings has a second surface spaced a predetermined distance apart from the first surface to provide a substantial clearance for conversion of the rolled material from a tubular to an oval shape during withdrawal.
  • a method as defined in the prior art portion of claim 8 is characterized by introducing blocking means into an outlet passage circumferentially disposed between the first and second sections of the rolling zone when the first and second movable curved surfaces are moving in a common direction; reversing the direction of movement of the movable surface of the second section arranged circumferentially adjacent to the first section when the material is formed into a roll; and removing the blocking means from the outlet passage when the direction of movement of the movable surface of the second section is reversed for discharge and flattening of the rolled material.
  • Figs. 1-3 inclusive illustrating the improved folding machine of the present invention in which plastic bags are individually wound into a roll of tubular geometry and flat folded
  • the bags are formed from any suitable polymeric material using any conventional bag making operation.
  • the preferred bag is the "U" folded side seam welded bag having a seamless boitom.
  • the folding machine of the present invention is intended primarily for folding bags, it is equally applicable for folding sheet goods of similar flexible material.
  • the folding apparatus includes a rolling cage 12 which is divided into a circumferentially disposed first roller section 14 and a second roller section 16.
  • the first roller section includes shafts 18, 20 and 22 and the second roller section includes shafts 24, 26, 28, 30, 32 and 34, all of which extend transversely across the rolling cage and all of which are rotatably supported between end plates 36.
  • the rolling cage 12 is defined by a plurality of belts 38 and 40 interconnecting adjacent driven pulleys 42 rigidly mounted on each of the rotatable shafts. As best seen from Fig.
  • the belts 38, 40 are disposed at least 270° of a circle to form a partial enclosure 44 of generally cylindrical configuration with a periphery defining the inside moving surface of the belts for driving the bag around into a roll.
  • the partial enclosure 44 leaves an opening 46, as best shown in Fig. 2, representing the intake passage to the rolling cage 12.
  • Driving force is transmitted to the bag by friction between the belts and the bag itself.
  • the belts 38, 40 are mounted on pulleys 42 all of which are of equal dimension and which are rigidly mounted to the rotatable shafts.
  • pulleys 42 are mounted on unidirectionally driven shafts 18, 20 and 22 which rotate in counterclockwise direction while the remaining pulleys are mounted on forward or reversibly driven shafts 24, 26, 28, 30, 32 and 34 and which can rotate in clockwise or counterclockwise direction.
  • the pulleys 42 on shafts 22 and 24 are not interconnected by a belt but do support conveyor belts 50 and 52 mounted on pulleys supported by shafts 22 and 24 respectively and pulleys (not shown) supported distally from pilleys 42 which belts lead away from the rolling cage.
  • Shafts 22 and 24 are spaced a greater distance from each other than are shafts 24, 26, 28, 30, 32 and 34 and shafts 22, 20 and 18 to provide an outlet passage 56 which lead the rolled bags between conveyor belts 50, 52 which flatten and discharge the rolled bag from rolling cage 12.
  • a reciprocating guide or fence 54 is provided to selectively block or open the outlet passage 56 between the pulleys on shafts 22 and 24.
  • fence assembly 54 is vertically disposed with respect to the rolling cage and has struts 58 which form a part of fence assembly 54.
  • the struts together with the entire fence assembly is adapted to move upward and downward so that struts 58 in upward position blocks outlet passage 56 whereas in downward movement, outlet passage 56 provides free passage of a rolled bag onto conveyor belts 50, 52.
  • the partial enclosure 44 leaves an opening 46 representing the intake passage to the rolling cage 12.
  • a bag 60 is disposed on guide belts 61 under guide rails 62.
  • Guide rails 62 are supported by guide bars 64 which are mounted on end plates 36, and the forward edges of the guide rails terminate at intake passage 46.
  • centrifugal force, bag material stiffness and the diameter of the bag as it is being rolled contribute to the normal force which holds the bag against the inner surface of belts 38, 40 and positively guide it to its rolled condition.
  • a unidirectional drive motor A has pinion gear 66 mounted thereon.
  • Pinion gear 66 drives gear 68.
  • Gear 68 is mounted on shaft 70 to drive shaft 22 connected at one end and bevel gear B connected at the opposite end.
  • the motor rotates so as to drive in the direction of the arrow shown on the bevel gear B.
  • Bevel gear B meshes with bevel gears C and D which are journaled on shaft E.
  • Spool clutch element F is slideably mounted on shaft E but keyed thereto to prevent relative rotation between shaft E and element F.
  • Clutch face H cooperates with the face on bevel gear D as a result of the spring loading of spring J to force clutch element F to the left.
  • shaft E and the attached bevel gear K are forced to turn in the same direction as gear D.
  • gear K meshes with bevel gear L, the gears 69, 71, 73, 75 and 77 through idler gears 72, all turn in the opposite direction of rotation to motor A.
  • motor A is connected to shaft 22, through gears 66 to 68, shaft 22 rotates in a direction opposite to that of motor A; therefore, all belts 38 and 40 forming the internal cage surface will be moving in the same direction in this mode of operation.
  • the spring force of J or the electromagnetic force produced by coil M when energized, causes yoke N to pivot in the selected direction about pin 0 to slide the spool clutch F to engage either bevel gear D or C.
  • Spring P causes fence assembly 54 to remain in interference and thereby block the passage 56 formed by belts 50 and 52 except when coil Q is energized.
  • the electromagnetic force resulting from energizing coil Q causes yoke R to pivot about pin Z to compress spring P and lower gate fence assembly 54 and struts 58 from its interference position.
  • Coils M and Q are energized simultaneously when switch S is closed by coil T.
  • Coil T is energized when photocell U senses the end of the bag to be rolled entering the rolling cage; therefore, the photo cell is physically located to sense the end of the bag as it passes 46, the entrance passage to the rolling cage.
  • the photocell U also causes the clutch-brake unit X to be energized when it senses the end of the bag to brake the motor and attached gearing to a complete stop. Energizing the brake also starts timer Y which subsequently releases the brake and connects the motor to the drive system through the clutch of the clutch-brake unit X.
  • Coils M and Q remain energized a sufficient amount of additional time to allow the rolled bag to be removed from the cage before the photocell U is reset.
  • Transformer V is connected to a power source W to maintain a potential on the photocell control circuit.
  • the photocell U senses the end of the bag and simultaneously energizes coils Q and M to retract the struts 58 of the fence assembly 54 out of interference and reverse the direction of rotation of a portion of the pulley shafts, thereby reversing the direction of motion of a portion of the internal surface of the rolling cage to thereby flatten and remove the rolled bag from the cage.
  • bag 60 is introduced into the rolling cage 12 by means of guide belts 61.
  • belts 38 and 40 are all moving in a common direction by virtue of the drive system and control apparatus described previously and the fence assembly is in its up most position with struts 58 blocking discharge passage 56.
  • the shafts and pulleys in the second section of the rolling cage are reversed in direction, and the struts are dropped out of interference with discharge or outlet passage 56.
  • the rolled bag is urged between belts 50, 52 where it is flattened between the confronting surfaces of the belts.
  • the flattened bag is considered appropriately folded at this point. However if additional folding is desired the bag can be directed to additional folding devices.

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  • Making Paper Articles (AREA)

Claims (9)

1. Machine pour enrouler et plier à plat un matériau (60) en feuille souple, comportant des moyens d'enroulement destinés à enrouler le matériau en un rouleau, des moyens de déchargement (50, 52, 56,) destinés à retirer le matériau enroulé desdits moyens d'enroulement, des moyens d'entrée (61, 62), destinés à introduire le matériau dans lesdits moyens d'enroulement, et des moyens de pliage destinés à plier le matériau enroulé comme souhaité après qu'il a été retiré desdits moyens d'enroulement, lesdits moyens d'enroulement comprenant une cage d'enroulement (12) agencée sur un arc décrivant un minimum de 270° d'un cercle, ladite cage d'enroulement étant divisée en une première section enrouleuse (14) et une seconde section enrouleuse (16), ladite première section enrouleuse ayant une première surface incurvée mobile sur son côté intérieur et ladite seconde section enrouleuse ayant une seconde surface incurvée mobile sur son côté intérieur, lesdites première et seconde surfaces incurvées mobiles étant conçues pour entraîner ledite matériau en un rouleau, et des moyens (A, B, D, E, H, K, L. 66 à 77) étant prévus pour déplacer lesdites première et seconde surfaces incurvées mobiles en un mouvement unidirectionnel pendant l'enroulement dudit matériau en feuille dans ladite cage d'enroulement, caractérisée en ce que
- lesdites deux sections enrouleuses (14, 16) sont agencées sur la circonférence de ladite cage d'enroulement (12);
- lesdites première et seconde sections enrouleuses (14, 16) disposées circonférentiellement sont espacées afin de former deux passages (46, 56): un premier (46) pour introduire le matériau (60) dans la cage d'enroulement (12) et le second (56) pour décharger le matériau enroulé de la cage d'enroulement;
- des moyens (C, G, M) sont prévus pour inverser le mouvement de ladite seconde surface incurvée mobile afin que les première et seconde surfaces incurvées mobiles soient capables de se déplacer dans un sens inverse pour décharger le matériau enroulé (60) de la cage d'enroulement (12); et
- des moyens de blocage (54) sont prévus pour bloquer le passage de sortie (56) lorsque les première et seconde surfaces incurvées mobiles se déplacent dans un sens commun.
2. Machine selon la revendication 1, comprenant en outre des moyens (50, 52) comuniquant avec ledit passage de sortie (56) pour retirer et aplatir le matériau enroulé (60) de ladite cage d'enroulement (12).
3. Machine selon la revendication 1 ou 2, dans laquelle lesdits moyens de blocage (54) comprennent un ensemble à barrière mobile ayant un système de branches (58) conçues pour bloquer ledit passage de sortie (56) lorsque ladite barrière est amenée en position d'extension.
4. Machine selon l'une quelconque des revendications 1 à 3, dans laquelle les surfaces incurvées mobiles desdites première et seconde sections enrouleuses (14, 16) sont définies par un système de courroies mobiles (38, 40).
5. Machine selon l'une quelconque des revendications 1 à 3, dans laquelle chacune desdites première et seconde sections enrouleuses (14, 16) est formée de plusieurs courroies (38, 40) passant sur des poulies menées adjacentes (42) qu'elles relient et qui s'étendent transversalement à la cage d'enroulement (12).
6. Machine selon l'une quelconque des revendications 1 à 3, dans laquelle la surface mobile desdites première et seconde sections enrouleuses (14, 16) est définie par un système de moyens tournants.
7. Machine selon la revendication 2, dans laquelle lesdits moyens communiquant avec ledit passage de sortie (56) pour retirer et aplatir le matériau enroulé (60) de ladite cage d'enroulement (12) comprennent plusieurs courroies transporteuses (50, 52) agencées en superposition en conçues pour s'éloigner de ladite cage d'enroulement, et dans laquelle ledit matériau enroulé est retiré de ladite cage d'enroulement en étant dirigé vers des surfaces opposées desdites courroies transporteuses.
8. Procédé pour plier un matériau (60) en feuille souple qui consiste:
(a) à prévoir une zone d'enroulement ayant un passage d'entrée (46) et étant divisée en une première section (14) et une seconde section (16), lesdites première et seconde sections ayant des première et seconde surfaces incurvées mobiles définissant au moins 270° d'un cercle pour former une enceinte partielle de configuration sensiblement cylindrique;
(b) à permettre aux surfaces mobiles desdites première section (14) et seconde section (16) de se déplacer dans un sens commun; et
(c) à introduire ledit matériau (60) en feuille souple dans ladite zone d'enroulement par l'intermédiaire dudit passage d'entrée (46) pour entrer en contact avec lesdites surfaces mobiles desdites première et seconde sections (14, 16) de façon que le matériau en feuille souple soit formé en un rouleau;

caractérisé par
(d) l'introduction de moyens de blocage (54) dans un passage de sortie (56) disposé circonférentiellement entre lesdites première et seconde sections (14, 16) lorsque les première et seconde surfaces incurvées mobiles se déplacent dans un sens commun;
(e) l'inversion du sens de mouvement de la surface mobile de ladite seconde section (16) agencée circonférentiellement à proximité immédiate de ladite première section (14) lorsque ledit matériau (60) est formé en un rouleau; et
(f) l'enlèvement des moyens de blocage (54) dudit passage de sortie (56) lorsque le sens du mouvement de la surface mobile de la seconde section (16) est inversé pour décharger et aplatir le matériau enroulé (60).
EP80101941A 1980-04-10 1980-04-10 Machine pour plier des sacs et procédé pour plier un matériau en feuille flexible Expired EP0037841B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP80101941A EP0037841B1 (fr) 1980-04-10 1980-04-10 Machine pour plier des sacs et procédé pour plier un matériau en feuille flexible
DE8080101941T DE3066239D1 (en) 1980-04-10 1980-04-10 Bag folding machine and method of folding flexible sheet material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80101941A EP0037841B1 (fr) 1980-04-10 1980-04-10 Machine pour plier des sacs et procédé pour plier un matériau en feuille flexible

Publications (2)

Publication Number Publication Date
EP0037841A1 EP0037841A1 (fr) 1981-10-21
EP0037841B1 true EP0037841B1 (fr) 1984-01-25

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ID=8186654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101941A Expired EP0037841B1 (fr) 1980-04-10 1980-04-10 Machine pour plier des sacs et procédé pour plier un matériau en feuille flexible

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EP (1) EP0037841B1 (fr)
DE (1) DE3066239D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6723036B2 (en) * 2002-06-19 2004-04-20 Contour Fabricators, Inc. Methods and apparatus for folding sheet material
CN111908236B (zh) * 2020-07-22 2022-04-15 山东科锐智能科技有限公司 一种快递垃圾收集处理设备
CN116280544B (zh) * 2023-05-27 2023-08-04 河北晶达包装材料有限公司 一种塑料包装袋折叠捆扎机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918698A (en) * 1970-11-23 1975-11-11 Coast Machinery Inc High speed machine and method for folding plastic bags and the like
US3671033A (en) * 1970-11-23 1972-06-20 Coast Machinery Inc Machine and method for folding plastic bags and the like
US4183515A (en) * 1978-06-28 1980-01-15 Union Carbide Corporation Bag folding machine

Also Published As

Publication number Publication date
DE3066239D1 (en) 1984-03-01
EP0037841A1 (fr) 1981-10-21

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