Package making – Progressively seamed cover web or web folds – With closing of web between package units
Patent
1998-12-04
2000-04-18
Sipos, John
Package making
Progressively seamed cover web or web folds
With closing of web between package units
533746, 533716, B65B 5130
Patent
active
060500654
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a packaging machine of the flowpacking type, i.e. for individual packaging of products advanced in a line with mutual spacing, the products being packed in a tubular web of packaging material, which is currently advanced to a cross closing station in which a set of jaw tools is reciprocated in such a manner that during each forward stroke the jaws are forced together so as to cross close the tubular web and preferably also cross cut this web, while during the following return stroke the jaws are kept spaced apart such that the jaw set can be freely returned along the succeeding product for being reclosed behind the rear end of this product, causing the product to be fully enclosed during the following advancing sequence of the tool set.
The tool set typically comprises two horizontal stamping or welding jaws which should carry out vertical movements during both the forward and the rearward stroke. Usually, this is realized in a manner which, in principle, is rather simple, viz. by arranging for a suitable motor equipment mounted on a reciprocable carrier sledge for the jaw tools and driving the jaws vertically.
This design may well be simple in principle, but it presents some drawbacks. The horizontal reciprocation of the driving means for the vertical movements requires repeated accelerations and decelerations of these driving means, which appear with a noticeable weight on the said sledge, whereby the complete system should be rather heavily constructed. Also, it is problematic to establish the required power supply to the driving means on the moved sledge by means of flexible hoses or cables, as these will be subjected to a huge number of movements by the packing of the lot of products.
On this background it has already been proposed to arrange for a sliding mechanical power transmission from a stationary motor for effecting the vertical movements of the jaw tools during the horizontal movements thereof. Thus, in U.S. Pat. No. 4,553,377 it is disclosed that the jaw set, a carrying base of which is reciprocated along fixed horizontal guiding rods, is in slidable operative connection with a likewise horizontal, but vertically moved guiding rail, such that the latter, by means of a separate and relatively complicated moving system with a stationary motor, may be raised and lowered for effecting the vertical movements of the jaws. Another proposal is known from U.S. Pat. No. 5,367,859, by which the jaw system, again guided horizontally along separate, fixed guiding rods, is connected with a grooved shaft horizontally extending in the direction of the reciprocation so as to project in a slidable manner through a stationary coupling nut, which is motor driven for achieving a rotation of the sliding grooved shaft to thereby effect the desired vertical movements of the jaws.
FR-2,638,420 provides a solution, where the horizontal movements of the jaw set are effected from stationary moving means in the form of a rotating driving wheel engaging the tool sledge by means of a connecting rod, while the vertical movements of the jaws are effected by a push rod system connected to the same driving wheel.
The above mentioned proposals for improvements are relatively complicated and voluminous, because driving means are used in positions entirely outside the moving area of the system and use is made of guiding means for the tool sledge and, in parallel therewith, transmission means for the vertical movements of the jaws.
With the present invention it has been realized that it is possible to fully integrate the said guiding and transmission means, viz. with the use of a rotatable guiding shaft which is in engagement with the tool sledge both for guiding the same axially and--by means of a slidable ring member on the sledge--for rotating this ring member, which may then in turn, through a simple, co-moved tansmission such as a driving chain or pinion, drive the jaw tools vertically, controlled by a fixed driving motor for the guiding shaft. The latter transmission can exhibit a relatively
REFERENCES:
patent: 3237371 (1966-03-01), Gerlach
patent: 4553377 (1985-11-01), Klinkel
patent: 5271210 (1993-12-01), Tolson
patent: 5367859 (1994-11-01), Suga
patent: 5904027 (1999-05-01), Bonde
Safran David S.
Sipos John
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