Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Reexamination Certificate
1999-12-23
2001-12-11
Vo, Peter (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
C493S212000, C493S255000, C493S313000, C493S929000
Reexamination Certificate
active
06328683
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for pulling up the ends of continuously transverse-conveyed flat tubular segments during the production of sacks or bags. The inventive device comprises lateral support elements, which run parallel to the conveying zone and between which a slit is formed that lies in the conveying plane and beyond which the ends to be pulled up project, and the inventive device comprises mechanisms for pre-opening the ends by pulling apart the tubular sides that lie on top of each other.
2. Description of the Related Art
To produce the socalled block bottom bags, one end or both ends of a flat lying tubular segment is/are drawn up into socalled bottom squares. These bottom squares comprise socalled comer flaps made of isosceles triangles, whose base edges, which run parallel to each other, are spaced apart. The bottom squares are then sealed by folding so as to overlap and then by gluing the socalled side flaps while optionally inserting a socalled bottom slip and a valve tube.
From DE-AS 16 11 701, DE-PS 23 23 727 and DE-GM 82 34 461 it is known, for example, to pull up the ends of the tubular segments using suction mechanisms or also just to pre-open and then to smooth out the corner flaps of the bottom squares with rotating sickle-shaped spreading members. In so doing, there is the specific problem of adapting these rotating spreading members with such precision to the ends of the continuously conveyed tubular segments that said ends are spread out as smooth as possible without tears.
SUMMARY OF THE INVENTION
The object of the invention is to provide a device of the aforementioned type with which the ends of the tubular segments can be easily pulled up into bottom squares.
The invention solves this problem in that in one section of the conveying zone the support elements form an obtuse angle in the shape of a peaked roof behind the mechanisms for pre-opening and that in this section at least one roll is positioned in such a manner at the support elements that the leading tubular edge strikes this roll.
With the device according to the invention one end or both ends of the tubular segments can be pulled up easily into bottom squares. The bottoms, which are pre-opened, for example, with suction mechanisms that travel along over a short distance, run into the slit between the support plates, which are angled off so as to form a peaked roof, and the biconical roll, whereby the sides lying between the lateral corner flaps are pulled apart so as to form the corner flaps. This pulling apart of the sides of the ends is done in the slit in such a manner that the circumferential speed of the biconical roll increases, starting from its center plane. This circumferential speed, which increases continuously on both sides in the outwardly direction, causes the sides of the tubular segments that rest under friction against the cone-shaped shell to be pulled toward the outside while simultaneously pulling up the bottom square.
A preferred embodiment provides that the roll comprises two straight truncated cones, which are connected together via their smaller bases and have the same vertex angles.
Expediently the smallest average diameter of the biconical roll lies in the conveying plane, and the surface lines of the biconical roll that face the support elements form together with the same a passage slit for the ends.
The support elements and the surface lines of the biconical roll run expediently parallel to each other.
Preferably the circumferential speed at the center of the driven biconical roll is greater than the conveying speed of the tubular segments.
The support elements are designed expediently as support plates.
Expediently the biconical roll exhibits a smooth surface so that it can grasp the ends to the tubular segments to be pulled up.
A preferred embodiment provides that the support plates in the area of the biconical roll have break-throughs that penetrate the freely rotatable support rolls. These support rolls, which slightly raise the sides of the ends to be pulled up from the support plates, facilitate the pulling up.
A preferred embodiment provides that in the region of the biconical roll there are on both sides laterally from said biconical roll driven conical rolls, whose surface lines, facing the support plates, define the passage slit with the same, and that the circumferential speed of the conical rolls is greater at their smallest inside diameter than the conveying speed of the tubular segments. These additional conical rolls support the pulling out of the ends into the bottom squares and the smoothing out process.
Expediently the lateral distance between the conical rolls and the biconical roll can be adjusted.
Expediently the average circumferential speed of the biconical roll is about three times the conveying speed of the tubular segments. The average circumferential speed of the outer conical rolls is also expediently three times the conveying speed of the tubular segments.
REFERENCES:
patent: 3765309 (1973-10-01), Joice
patent: 3896708 (1975-07-01), De Vries
patent: 3896714 (1975-07-01), Bosse
patent: 6042526 (2000-03-01), Baumer
patent: 714 028 (1941-11-01), None
patent: 1 611 701 (1971-10-01), None
patent: 2 323 727 (1974-11-01), None
patent: 82 34 461 (1983-06-01), None
Desai Hemant M.
Jacobson & Holman PLLC
Vo Peter
Windmoller & Holscher
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