Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With cutting – punching – piercing – severing – or tearing
Patent
1983-01-13
1984-09-25
Weston, Caleb
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With cutting, punching, piercing, severing, or tearing
156512, 271196, 271197, B32B 3118
Patent
active
044734310
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus for making plastic material bags from a flattened tubular film web which is intermittently advanced and for depositing them in groups on a conveyor belt which is adapted to be intermittently driven, comprising air blast nozzles, which are disposed on both sides of the tubular film web and project the advanced leading end of the tubular film web in a stretched condition, cyclically operated transverse welding and transverse cutting means for providing the bags with end seam welds and for severing the bags from the tubular film web, and retaining means, which in the direction of advance of the tubular film web succeed the transverse cutting means and serve to retain the last bag severed from the tubular film web adjacent to the opened rim of said bag.
In apparatus of that kind which is known from Laid-open German Application No. 28 33 236 for retaining means comprise two rows of needles, which interdigitate like combs and extend through slots in a support plate, which bridges the gap between the cutting means and the belt conveyor and are secured to supports, which are disposed below said cover plate and provided with drive means and move the rows in alternation from a pinning position, in which the needles extend above the support plate, to a position in which the needles are extended toward the conveyor belt. Before or at the beginning of the advance of a row, the other row, which is in its advanced position, is retracted from the stack under the support plate and moved to its pinning position during the advance. During the advance of each row of needles, the drive for the conveyor belt is operated so that the next following bag is the first to be pinned on the row of needles which are in pinning position and that bag overlaps like a shingle the stack which has been pushed off. The air blast flowing over the stacks of bags cannot derange the stacks because the bags are either pinned on and retained by a row of needles or the stacks are covered by the bag or bags of the following stack as by shingles.
The known machine involves a substantial expenditure and can be used only to make bags having open end rims which have been perforated by the retaining needles.
For this reason it is an object of the invention to provide apparatus which is of the kind described first hereinbefore and which is structurally simple and can be used to make imperforate bags.
This object is accomplished according to the invention in that the retaining means consist of a suction box, which adjacent the transport plane is provided with suction holes arranged in two rows, which extend transversely to the direction of advance and have spacing which is approximately as large as the pitch of the shingled group of bags, a pressure roller is provided, which is adapted to be raised and lowered and adapted to be lowered onto the last bag which has been deposited, said pressure roller cooperates with a backpressure roller, which is disposed under the upper course of the conveyor belt and the pressure roller is so controlled that it is lowered substantially only during the intermittent advance of the conveyor belt. In each group which has been deposited, the shingled bags have a pitch which is approximately as large as the distance from the transverse cutting means to the first row of suction holes. The end of the tubular film web is projected by the air blast to a position under the pressure roller which can be lowered. When the tubular film web is depressed by the cutting knife or another part of the cutting means, the pressure roller is lowered and the drive for the conveyor belt is started at the same time so that the open end rim of the last but one bag, which rim has been sucked by the rear row of suction holes, is pulled off and the bag which has been formed last is pulled over the row of suction holes until the open end rim of said bag just covers said row of suction holes.
By control means, the apparatus is controlled in such a manner that after a group consisting of shingled bags in a predetermined
REFERENCES:
patent: 3218897 (1965-11-01), Geigenmiller et al.
patent: 3232605 (1966-01-01), Plummer et al.
patent: 3315956 (1967-04-01), Lyman
patent: 4221377 (1980-09-01), Bodewein et al.
patent: 4247094 (1981-01-01), Vits
patent: 4308021 (1981-12-01), Achelpohl
Weston Caleb
Windmoller & Holscher
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