Package making – Closing packages and filled receptacles – By means adapted to engage outturned seam of package cover
Patent
1997-04-21
1998-06-30
Coan, James F.
Package making
Closing packages and filled receptacles
By means adapted to engage outturned seam of package cover
533746, 533754, 53550, B65B 5110, B65B 5130
Patent
active
057716609
DESCRIPTION:
BRIEF SUMMARY
From U.S. Pat. No. 2,467,879, an apparatus for the transverse sealing of tubular bags is known. The two cooperating transverse sealing jaws are each seated on a support so as to be resilient, which support orbits on a circular path respectively by means of a parallelogram crank mechanism. While orbiting, the two sealing jaws remain parallel to one another. This accomplishes the production of the sealing seam over a certain feed section of the packaging tube. Thus, higher cadences can be accomplished compared to conventional, cylinder segment-shaped, orbiting sealing jaws, e.g., according to EP-A-399 948. However, the transverse sealing apparatus causes more noise than conventional transverse sealing apparatuses.
It is the object of the present invention to modify a transverse sealing apparatus of the type mentioned at the outset in such a way that it produces less noise during operation. This object is accomplished by the combination of features of the claims.
In the following, an embodiment of the invention is explained by way of the Figures. These show:
FIG. 1 a schematic side view of a transverse sealing apparatus, and FIG. 2 a section of a variant of the apparatus according to FIG. 1.
A side view of an apparatus 10 according to the invention is shown in FIG. 1. With means that are not shown, e.g., according to EP-A-399 948, a packaging tube 1 is fed which comprises products 2 at regular intervals. Transverse sealing seams 3 are formed with the apparatus 10 between the products 2 in the center plane 4 of the tube 1 and cut through in the middle. The individual packages 5 are carried away on a conveyor belt 6 in the conveying direction A.
On respectively two upper and lower shafts 11, 12, 13, 14, which are spaced apart from one another, a total of four crank wheels 15-18 are mounted which are all synchronously driven by a drive motor 19. The upper wheels 15, 16 run counterclockwise, the lower wheels run clockwise. The gear linkages between motor 19 and wheels 15-18 are indicated symbolically by chains 20 and a gear train 21. The wheels 15-18, which have at least approximately a uniform radius 22 from the shafts 11-14, carry axis-parallel pins 23-26. An upper support 27 is circulatingly seated on the pins 23, 24 of the upper wheels 15, 16 such that it at least approximately forms a parallelogram with the crank radii 22 and the connecting line between the shafts 11, 12 so that the support 27 orbits parallel to itself when the wheels 15, 16 are running. A lower support 28 is likewise fastened to the pins 25, 26. The upper support 27 and the lower support 28 each carry a transverse bar 29, 30 on their back end face. The transverse bars 29, 30 are guided on the supports 27, 28 so as to be displaceable in height and can be adjusted by means of screws 31. In an appropriate position, the transverse bars 29, 30 may also be fixedly connected to the supports 27, 28.
In the bars 29, 30, a sealing jaw 37 or an opposite jaw 38 are guided so as to be displaceable in height. The jaws 37, 38 have a parallel, plane sealing surface 39 or opposite surface 40 and are biased by several springs 41 in the direction toward the center plane 4. In the center, one of the jaws 37, 38 is provided with a knife, not shown, for separating the tube 1 during sealing. Respectively two guide rods 42 are fastened to the jaws 37, 38, which guide rods project beyond the bars 29, 30 and are provided with a thread 43 on their free end onto which an adjustment nut 44 is screwed. By adjusting the screws 31 and nuts 44, it is possible to set the rotational angle of the wheels 15-18 at which the surfaces 39, 40 arrive into contact, thus also the path segment during which the sealing takes place. In addition, the bias of the springs 41 and, therewith, the sealing pressure can be set with these adjusting means. In the place of springs 41, pressurized air or a different fluid can also be used as pressing element.
To prevent the two jaws 37, 38 from striking one another, respectively two supporting strips 48, 49 with plane supporting surfaces 50, 51 par
REFERENCES:
patent: 2467879 (1949-04-01), Billeb
patent: 4120235 (1978-10-01), Beck et al.
patent: 4141196 (1979-02-01), Blanding
patent: 4433527 (1984-02-01), Ramsey et al.
patent: 4563860 (1986-01-01), Pfankuch
patent: 5271210 (1993-12-01), Tolson
patent: 5371999 (1994-12-01), Hansen et al.
patent: 5537804 (1996-07-01), Tolson
patent: 5628163 (1997-05-01), Keopple et al.
Coan James F.
Kim Gene
SIG - Schweizerische Industrie-Gesellschaft
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