US3765308A - Bag stripping means for an automatic bag making device - Google Patents

Bag stripping means for an automatic bag making device Download PDF

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Publication number
US3765308A
US3765308A US00214792A US3765308DA US3765308A US 3765308 A US3765308 A US 3765308A US 00214792 A US00214792 A US 00214792A US 3765308D A US3765308D A US 3765308DA US 3765308 A US3765308 A US 3765308A
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United States
Prior art keywords
bag
stripping
mandrel
endless
wall
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Expired - Lifetime
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US00214792A
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English (en)
Inventor
R Auckenthaler
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.)
Schweizerische Industrie Gesellschaft
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Schweizerische Industrie Gesellschaft
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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
    • B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31C1/00—Making tubes or pipes by feeding at right angles to the winding mandrel centre line
    • B31C1/08—Accessories of machines therefor not otherwise provided for
    • B31C1/083—Winding mandrels
    • B31C1/086—Winding mandrels expansibles
    • 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
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • B31B50/28—Folding sheets, blanks or webs around mandrels, e.g. for forming bottoms
    • B31B50/282—Folding sheets, blanks or webs around mandrels, e.g. for forming bottoms involving stripping-off formed boxes from mandrels

Definitions

  • the bag stripping device is provided with an endless continuously moving stripping band whose upper horizontal stringer is urged by a pair of rollers on a rocker against the lower horizontal side wall of a bag which is formed by folding and gluing a blank on a horizontally disposed mandrel.
  • the mandrel is provided with a pivotally mounted horizontal jaw adapted to loosely engage the inner face of said horizontal wall of the bag, and two rollers within said mandrel are oppositely disposed to said above mentioned pair of rollers for engaging said horizontal side wall of the bag and permit a stripping of the bag from the mandrel by the lengthwise movement of said stripping band.
  • the capacity of such a device is, among other things, limited by the inertia forces which are generated during the back-and-forth movement of the slidable member and these forces become excessive with increasing operating speed so that difficulties occur, particularly during the transfer of the stripped bag from. the slidable member to additional conveying members.
  • the drawing illustrates by way of example an embodiment of the device of the invention.
  • FIG. 1a illustrates in alongitudinal section the left hand portion of a stripping device of a'bag producing machine substantially along the broken II of FIG. 2.
  • FIG. lb illustrates the right hand end of the stripping device also taken along the broken line l-I.of FIG. 2.
  • FIG. 2 illustrates a cross section of the stripping device substantially along the broken line II-II of FIG. la.
  • the device for the making of bags is provided with a mandrel 1 which, after a stepwise passage through a plurality of stations, reaches the last station illustrated in FIG. 1a of the bag producing cycle.
  • the completed bag '2 which has been formed on the. mandrel l, is to be stripped from the latter;
  • the mandrel l in FIG. la consists principally of a horizontally disposed mandrel body 3 and a horizontal mandrel jaw 4, which with one of its ends at 5 is pivotally mounted on the body 3.
  • a vertical pressure spring 6 surrounds a vertical pin 7 attached to the body 3 and has the tendency to move the jaw 4 toward an opening position, namely, downwardly so that an abutment shoulder 8 in a countersunk bore engages a head 9 provided on the lower end of the pin 7.
  • the shoulder 8 does not engage the head 9 because an abutment roller 10 mounted on a vertical pin 11 attached to the jaw 4 is being engaged by a control cam 12 and therefore the jaw 4 has been moved counterclockwise against the force of the spring 6 in the opposite closure direction.
  • the mandrel 1 In the rest position of the jaw 4, which is the position in which the shoulder 8 engages the head 9, and which occurs in the preceding stations and on the way be tween the same, the mandrel 1 has in cross section a rectangular profile as shown in FIG. 2.
  • the bag 2 In the preceding stations the bag 2 will be formed in known manner from a blank of any desired type, for instance, it may be made of paper, metal, or plastic. This blank is successively folded around the mandrel 1 to form firstly the side walls 13 and then the bottom 14 of the bag 2. The bag 2 remains open opposite the bottom 14 and has a filling opening 15.
  • the mandrel 1 may, for instance, be one of a plurality of other mandrels of the same type which radially project outwardly from the hub of a mandrel wheel which rotates about a vertical axis and is located to the left hand side of FIG. la so that by a stepwise rotation the mandrels one after the other will be moved into the different stations.
  • the blank In the last station the blank is not only folded, but may also in the folded condition be glued or welded to form a fixed shape.
  • the mandrels may, however, also be moved in cycle by means of an endless conveyor chain, one after the other, from one station to the next one.
  • the invention provides a device 16 for stripping the bags 2 from a horizontally disposed mandrel.
  • This device 16 is equipped with an endless stripping band 17 threaded over two horizontal and substantially horizontally spaced rollers 18 and 19.
  • One of these rollers, for instance, the roller 19, (FIG. lb) is continuously driven clockwise as indicated by the arrow 20.
  • the upper stringer 17 of the endless stripping band 17 moves along the horizontal legs 21 and 22 of two equal sided angle irons 21, 22.
  • the invention provides two pairs of oppositely disposed pressure rollers 23 and 24.
  • the two upper rollers 23 are rotatably supported on two supports 25 arranged within the hollow space 26 of the mandrel body 3 and are attached to the latter. These two rollers 23 are arranged in the longitudinal center plane of the mandrel 1 and project into two openings 27 provided in the horizontally disposed jaw 4. In the rest position of the horizontally disposed jaw 4 its lower outer surface 28 is tangentially disposed to the lower portion of the rollers 23 while in the illustrated stripping position the rollers 23 project beyond this outer surface 28.
  • the two other lower pressure rollers 24 are rotatably mounted on the opposite ends of a horizontally arranged rocker 29, the center of which is pivotally mounted by a horizontal pin 30 to a fork 31.
  • the fork 31 is arranged at the free end of a substantially horizontally extending arm 32 which is pivotally supported by a horizontal pin 33 secured to the vertical leg 21 of the angle iron 21. This pin 33 is, however, not illustrated in FIG. 2 for the sake of clearness.
  • At the free end of the arm 32 which carries the fork 31 is also attached another pin 34 to which is pivotally mounted the upper end of a vertical operating rod 35 which is movable back and forth in vertical direction as indicated by the double arrow 36.
  • the rollers 24 extend through marginal recesses 37 arranged in the horizontal legs 21, and 22, of the angle irons 21 and 22.
  • the upper faces of the angle iron legs are tangential with respect to the rollers 24 prior to the raising of the operating rod 35 or may also be disposed somewhat above the same.
  • the rollers 24 urge the upper stringer 17 of the stripping band 17 toward the rollers 23 and against the lower horizontal sidewall 13 of the bag 2 so that the bag 2 will be engaged by the upper stringer 17 to move with the same so that the bag 2 is stripped from the mandrel 1.
  • the mandrel body 3 may be provided in its end wall 38 with an aperture 40.
  • a not illustrated compressed air line which extends through the shaft of the mandrel wheel and to the aperture 40 so that in the instant of the stripping procedure a stream of compressed air may be blown against the bottom 14 so that the stripping of the bag 2 is facilitated or accelerated. It is obvious that after the stripping of the bag 2, the rod 35 is again lowered before the next mandrel 1 moves into the stripping station.
  • the invention For the purpose of holding the bag 2 on the upper stringer 17, the invention provides an endless rubber cord 41 which is guided over rollers 42 to 49 as shown, particularly in FIG. 1b.
  • rollers 42 to 49 As shown, particularly in FIG. 1b.
  • One of these rollers, for instance the roller 42 (FIG. la) is continuously driven in the direction of the arrow 46 so that the cord 41 is moving in the same direction and with the same speed as the endless stripper band 17.
  • a section 41 of the cord 1 moves in spaced relation parallel above the stringer 17 and in the same direction as the same and at such a distance from the same which is somewhat less than the corresponding transverse dimension of the bag 2 so that the latter with a small force is elastically urged by the cord 41 against the stringer 17
  • the two rollers 46 and 47 are rotatably mounted at the opposite ends of a rocker 50, the center of which is rotatably mounted on horizontal pin 51 which is in turn pivotally mounted in a stationary bearing of the machine frame 6.
  • the rocker 50 is pivotally moved back and forth about the pin 51 by a not illustrated means, for instance, by a cam disc, in a manner indicated by the double arrow 52.
  • the bag is hereby transferred to a receiving seat 53 having an angle of 90 and mounted on a pivoted erection arm 54.
  • the rollers 45 and 48 are so arranged that the length of the cord 41, during tilting of the rocker 50 does practically not change in its length for all practical purposes. Minor differences in the length are compensated for by the elasticity of the rubber cord 41.
  • the erection arm 54 is pivotally attached to a horizontally disposed stationary shaft 55 so that the arm 54 may be pivoted about an angle of minus 0:; namely about 45 clockwise, and will come into the position 54' illustrated in dash and dotted lines.
  • the bag is now disposed in a vertical position and may be conveyed by a not illustrated conveyor in this upright position to a filling station.
  • a not illustrated conveyor in this upright position to a filling station.
  • the time interval between the arrival of two successively filling bags into the position 2 is for all practical purposes too short if the advantage of the device, namely a high production of, for instance bags per minute, is to be realized.
  • Bag stripping means for an automatic bag making device provided with a plurality of mandrels which successively move through several operating stations and on whose last station the bag blanks are folded and cemented, said stripping means comprising at least one continuously horizontally moving endless stripping member moving in longitudinal direction of the mandrel which presents a bag for stripping, pressure means for urging said stripping member against a horizontal wall of the bag on said mandrel for frictionally engaging said wall and horizontally stripping said bag from said mandrel, a horizontal jaw pivotally mounted with one of its ends to said mandrel and extending into engagement with the inner face of the wall of said bag whose outer face is engaged by said stripping member, spring means for urging said jaw toward engagement with said wall, a first roller means in said mandrel and extending through apertures in said jaw and in engagement with said wall of said bag, and other roller means opposite said first roller means and adapted to engage said stripping member and urging it against said outer face of said bag on said mandrel.
  • Bag stripping means including a rocker mounted pivotally with its center position to the upper end of a vertically reciprocable operating rod, said other rollers being rotatably mounted at the ends of said rocker.
  • Bag stripping means for an automatic bag making device provided with a plurality of mandrels which successively move through several operating stations and on whose last station the bag blanks are folded and cemented, said stripping means comprising at least one continuously horizontally moving endless stripping member moving in longitudinal direction of the mandrel which presents a bag for stripping, and pressure means for urging said stripping member against a horizontal wall of the bag on said mandrel for frictionally engaging said wall and horizontally stripping said bag from said mandrel, said mandrel being provided with an end wall engaging the inner face of the bottom wall of said bag, said end wall being provided with an aperture for the introduction of compressed air to assist in the stripping of said bag from said mandrel.
  • Bag stripping means for an automatic bag making device provided with a plurality of mandrels which successively move through several operating stations and on whose last station the bag blanks are folded and cemeneted, said stripping means comprising at least one continuously horizontally moving endless stripping member moving in longitudinal direction of the mandrel which presents a bag for stripping, pressure means for urging said stripping member against a horizontal wall of the bag on said mandrel for frictionally engaging said wall and horizontally stripping said bag from said mandrel, an endless bag engaging member arranged in part in parallel spaced relation above said endless stripping member and moving in the same direction as the latter, so that said bag after being stripped from said mandrel is engaged by both said bag engaging member and said stripping member and moved away from said mandrel, said endless bag engaging member being provided adjacent the one end of said endless stripping member with a section extending between two guide rollers on a rocker and normally in horizontal alignment with the preceding section of said bag engaging member, means for tilting said rocker so as to discharge said
  • Bag stripping means for an automatic bag making device provided with a plurality of mandrels which successively move through several operating stations and on whose last station the bag blanks are folded and cemented, said stripping means comprising at least one continuously horizontally moving endless stripping member moving in longitudinal direction of the mandrel which presents a bag for stripping, pressure means for urging said stripping member against a horizontal wall of the bag on said mandrel for frictionally engaging said wall and horizontally stripping said bag from said mandrel, an endless bag engaging member arranged in part in parallel spaced relation above said endless stripping member and moving in the same direction as the latter, so that said bag after being stripped from said mandrel is engaged by both said bag engaging member and said stripping member and moved away from said mandrel, said endless bag engaging member being provided adjacent the one end of said endless stripping member with a section extending between two guide rollers on a rocker and normally in horizontal alinement with the preceding section of said bag engaging member, means for tilting said rocker so as to discharge said bag

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US00214792A 1971-01-06 1972-01-03 Bag stripping means for an automatic bag making device Expired - Lifetime US3765308A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH13771A CH535160A (de) 1971-01-06 1971-01-06 Mit einer Beutel-Abstreifvorrichtung versehene Einrichtung zur Herstellung von Beuteln

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US3765308A true US3765308A (en) 1973-10-16

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US00214792A Expired - Lifetime US3765308A (en) 1971-01-06 1972-01-03 Bag stripping means for an automatic bag making device

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US (1) US3765308A (enrdf_load_stackoverflow)
CH (1) CH535160A (enrdf_load_stackoverflow)
DE (1) DE2160232A1 (enrdf_load_stackoverflow)
GB (1) GB1304670A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242949A (en) * 1978-04-21 1981-01-06 Sig - Schweizerische Industrie-Gesellschaft Apparatus for making packaging sleeves

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1089586B (it) * 1977-11-30 1985-06-18 Amf Sasib Un perfezionamento alle macchine impacchettatrici di sigarette
CN102001195B (zh) * 2010-09-16 2012-07-04 敬宇凡 纸张剥离机
CN105479814B (zh) * 2015-11-30 2018-04-13 温州优比科实业有限公司 脱袋装置及包含有该脱袋装置的无纺布制袋机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US704807A (en) * 1901-07-11 1902-07-15 Charles F Kellner Paper-bag-making machine.
US3004478A (en) * 1959-08-17 1961-10-17 Sydney R Phin Apparatus for forming cartons from carton blanks
US3530773A (en) * 1967-07-12 1970-09-29 Hesser Ag Maschf Forming mandrel for machine fabricating packaging containers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US704807A (en) * 1901-07-11 1902-07-15 Charles F Kellner Paper-bag-making machine.
US3004478A (en) * 1959-08-17 1961-10-17 Sydney R Phin Apparatus for forming cartons from carton blanks
US3530773A (en) * 1967-07-12 1970-09-29 Hesser Ag Maschf Forming mandrel for machine fabricating packaging containers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242949A (en) * 1978-04-21 1981-01-06 Sig - Schweizerische Industrie-Gesellschaft Apparatus for making packaging sleeves

Also Published As

Publication number Publication date
DE2160232A1 (de) 1972-07-27
GB1304670A (enrdf_load_stackoverflow) 1973-01-24
CH535160A (de) 1973-03-31

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