Package making – Progressively seamed cover web or web folds – With closing of web between package units
Patent
1989-07-17
1990-12-04
Spruill, Robert L.
Package making
Progressively seamed cover web or web folds
With closing of web between package units
493197, 493205, B65B 908
Patent
active
049743961
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for manufacturing bags comprising a mandrel for shaping a band made from a packing material into a tube, a sealing device for dividing the tube into separate bags, and a rotatable conveying device for feeding the tube.
Apparatuses for manufacturing bags or bag packaging, in which a packing material band is shaped to form a tube, and the tube is drawn forward and divided cyclically by one bag length in each instance, are substantially divided into two types; namely, gripper feed machines and belt or roller feed machines. In gripper feed machines, the tube is fed by a bag length in each instance by a transverse sealing device which is moved in reciprocating or up-and-down motion, while the tools of the transverse sealing device simultaneously apply transverse seams to the tube and divide a bag. In these machines, the sealing time corresponds to the feed time. A disadvantage of this type of tube bag machine is that the end is shaped in a wedge-shaped manner by an exerted tension during the drawing forward of the tube, so that a formation of a base is impeded and, accordingly, the holding or volumetric capacity of the bag is not fully utilized.
In belt or roller feed machines, on the other hand, the tube is drawn forward by a bag length in a stepwise manner by a pair of conveying belts or rollers by frictional engagement, and the transverse sealing seams are applied by a stationary sealing device during every stoppage. In this type of tube bag machine, a clean standing base can be formed, but it has the disadvantage that the time for the transverse seam sealing and for the tube feed are cumulative, and the output of this type of machine is accordingly lower than that of the gripper feed machine.
Further, a tube bag machine is known from DE-OS No. 21 34 475 in which the tube feed is carried out by a reciprocated transverse sealing device as well as by conveying rollers or belts which are conveyed cyclically. In this tube bag machine, however, the transverse sealing device is moved in a reciprocating manner only a part of the length of the bag to be manufactured, and the remaining tube length for a bag to be manufactured is drawn forward with the aid of the conveying rollers or belts. In this known tube bag machine, it is very difficult to manufacture bags having the same length in each instance. Moreover, the time which is available for the transverse seam sealing is not fully used.
SUMMARY OF THE INVENTION
It is the object of the invention to provide an apparatus for manufacturing bags on which bags can be formed with a shaped base and on which bags with very strong transverse sealing seams can be manufactured. This object is achieved by providing an apparatus in which the sealing device and the rotatable feed device are driven synchronously during a conveying phase of feeding the tube.
With the apparatus, according to the invention, bags and bag packaging with sealing seams of high strength can be manufactured with very high output. Moreover, the produced bags have a large holding capacity as they are formed on a single base.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of a preferred embodiment with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
A single drawing, FIGURE shows a simplified front view of a tube bag machine according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A shaping and filling tubular mandrel 12 is suspended vertically from a plate 11 which extends out of a machine frame 10. A shaping shoulder 13 encloses the upper portion of the shaping mandrel 12, a heat-sealable packing material band 1 being drawn off from a supply roll, not shown, via the shaping shoulder 13 and is wrapped around the shaping mandrel 12 to form a tube 2. The overlapping rims of the packing material band 1, which is shaped to form a tube 2, are seale
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Johnson Linda B.
Robert & Bosch GmbH
Spruill Robert L.
Striker Michael J.
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