Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1989-07-28
1991-07-09
Terrell, William E.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
414 27, 4147904, B31B 2398, B31B 1998, B65H 2940
Patent
active
050301918
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for depositing and stacking bags having a bottom seam and manufactured from a tubular film of a thermoplastic synthetic resin moved in increments in the feeding direction, by welding and cutting transversely to the feeding direction, with a welding and cutting unit operating in cycles for welding the bottom seam and severing the bags transversely to the feeding direction, and with a subsequently arranged stacking and conveying unit with crossbeams of strip shape attached to a movable support transversely to the feeding direction, these crossbeams being equipped with vertically upwardly oriented holding elements in the shape of pins, stacking tubes, or the like, the severed bags being deposited on these holding elements
A device of this type has been known, for example, from DOS 2,305,800 wherein the holding elements for receiving the bags are mounted rigidly to belts rotating in sections in an endless fashion and are oriented upwardly in the vertical direction only in the receiving position for the bags. The bags are seized by the holding elements before the bags are cut off the tubular film. This device can be used for depositing the bags loosely into stacks; simultaneous interlocking of the bags into stacks at the depositing site cannot be performed.
Devices for the production of interlocked stacks of bags with bottom seam are known, for example, from DOS 2,254,448 and DOS 2,358,281 wherein a single, liftable and lowerable strip arranged transversely to the feeding direction and having vertically upwardly oriented holding elements is provided for the bags cut off from the tubular film, units for perforating and weld bonding being associated therewith. Similar devices for the manufacture of optionally interlocked stacks of bags with bottom seam exhibiting only a single strip with vertical holding elements, such as needles, are disclosed in DOS 3,211,217, DOS 3,021,868, DOS 3,100,722, DAS 2,141,045, and U.S. Pat. No. 4,261,780.
DOS 3,026,494 discloses a device for stacking and depositing bags with lateral seams; after separating from the tubular film, these bags are individually carried away by the vacuum-exposed arms of a revolving impeller wheel and are deposited into stacks on holding strips arranged to be rotatable in increments in the horizontal feeding plane and exhibiting vertical pegs. The holding strips are additionally designed to be tiltable for delivering the stacks.
This method of lifting off and stacking bags with lateral seams cannot be employed, however, for bags with bottom seams wherein the latter is welded transversely to the feeding direction and wherein the bag opening with the hang-up holes extends, with corresponding feed, likewise transversely to the feeding direction.
Bags having bottom seams show the advantage over bags with lateral seams, however, that they afford, with laid-in lateral pleats, a substantially higher filling volume.
The invention is based on the object of making it possible to deposit and stack bags with bottom seam on holding elements and also transfer to wire bows (wickets) and/or permitting blocking of bags deposited into stacks in this way. The device is to afford a production process for the bags with bottom seam and made of thermoplastic synthetic resin films that can be performed as far as possible without interruption, i.e. without idle cycles, at high production rate.
In order to attain the aforementioned object, a device of the type described herein is fashioned in such a way that the crossbeams are articulated and guided at the periphery of a rotatable support which support, is designed especially in the manner of an impeller, and is arranged vertically with respect to an advancing plane. Consequently, the holding elements retain their vertically oriented position along the revolving route of the crossbeams with the support.
The stacking and conveying unit according to this invention is designed as a revolving pin stacker; the deposited stacks are further transported in increments along a circular route in a vertical pl
REFERENCES:
patent: 3221902 (1965-12-01), Young
patent: 3343691 (1967-09-01), Anderson
patent: 3791267 (1974-02-01), Brooks
patent: 4342564 (1982-08-01), Lehmacher
patent: 4693701 (1987-09-01), DeBin
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