Package making – Methods – Enclosing contents within progressively formed web means
Reexamination Certificate
1998-12-23
2001-01-30
Sipos, John (Department: 3721)
Package making
Methods
Enclosing contents within progressively formed web means
C053S551000, C053S552000, C053S374600, C053S075000
Reexamination Certificate
active
06178726
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method of controlling an end sealing time period as long as possible for a longitudinal-type or a traverse-type bag forming, filling and packaging machine adapted to effect a box-motion type end sealing.
2. Description of the Related Art
A typical longitudinal-type bag forming, filling and packaging machine is constructed as shown in
FIG. 1. A
packaging film is introduced to a former
9
where the film is folded to wrap about a product filling cylinder
2
and to form a seam at the front side of the former
9
. The seam is longitudinally sealed by a longitudinally sealing device
3
or
3
′ so that the film forms a packaging cylinder H. A film feeding device
4
, located at a side of the product filling cylinder
2
, pulls the packaging cylinder H downwardly so that the packaging cylinder
2
is located below the product filling cylinder
2
. Then, an end-sealing (lateral-sealing)/cutting device
5
effects the end-sealing (lateral-sealing) and the cutting of the packaging cylinder H, so that a packaged product J is discharged. Although this end-sealing may be effected at a fixed position, such an arrangement is available that carries out a box motion as shown by a in order to elongate a sealing time period. The box motion makes it possible to move the end-sealing/cutting device
5
downwardly along a linear segment b in synchronous with the travel of the packaging cylinder without the stoppage of the travel of the packaging cylinder. That is, the sealing with a heater continues during the movement along the line segment b, the sealing time period can be elongated without any stoppage of the travel of the packaging cylinder. The content, such as confectionery, to be filled into the packaging cylinder is delivered downwardly through the product filling cylinder
2
during a return period c of the box motion of the end-sealing.
The operation of the end-sealing (lateral-sealing)/cutting device
5
will be described in detail. At the upper portion d of the linear segment of the box motion a, heaters for the end-sealing (lateral-sealing) are closed toward each other in conformity with a cut position of the packaging cylinder H. Prior to the complete close of the end-sealing heaters, two pairs of opposing shutters are closed to make the packing cylinder flattened. The opposing shutters in each pair are elastically held in such a manner as to protrude toward the mating shutter more closely than the right and left end-sealing heaters do, and the two pairs are respectively arranged at upper and lower sides of the right and left sealing heaters. The end-sealing heaters are thereafter closed completely to seal the packaging cylinder H at two lateral-rows simultaneously, while the cutter cuts the cut position (i.e. an intermediate position between the two lateral-rows). One of the lateral-row is located at the proximity of the upper side of the product to be packaged, which has been fallingly delivered and filled through the product filling cylinder, and the other of the lateral-row is located at the proximity of the lower side of the product to be packaged, which are to be fallingly delivered and filled subsequently.
The above-described box motion type end-sealing/cutting device is designed so that the pair of end-sealing heaters are moved along such loci (i.e. two arcuate loops a) that a pair of cam curves, each being formed by a circle partially cut at its one side with a linear segment, are opposed to the other. That is, the box motion type end-sealing/cutting device repeatingly makes such symmetrical box motion that a pair of end-sealing heaters are closed to each other to carry out the lateral two row sealing while being moved downwardly, and subsequently open widely while being returningly moved upwardly so as not to interfere with the product to be packaged after the cutter cuts the packaging cylinder at the cut position between the sealed lateral two rows. The two pairs of shutters, additionally provided to the box motion type end-sealing/cutting device, are not special ones, that is, they have the same structure as two pair of shutters additionally provided to a conventional end-sealing/cutting device which is not the box motion type device. The shutters simply function to be closed to each other and to make the packaging cylinder flattened prior to the complete close of the pair of the end-sealing heaters when the end-sealing/cutting device
5
makes the box motion to close the pair of end-sealing heaters.
The longitudinal type bag forming, filling and packaging machine suffers from a possibility that a packaging error occurs to bite a product to be packaged when the lateral-sealing is carried out by the pair of end-sealing (lateral-sealing) heaters since the product to be packaged may become bulky in a height direction or rebounded up after being fallen down. For this reason, the end-sealing/cutting device is additionally provided with a product-biting preventive device equipped with a pair of stripping plates, so that the pair of stripping plates strip the packaging cylinder over an area from the upper side to the lower side of the cut position to forcibly push the product to be packaged when the pair of the end-sealing heaters are open. Japanese Patent Application Laid-Open No. Sho. 58-195101, U.S. Pat. No. 5,203,145, U.S. Pat. No. 4,947,618, U.S. Pat. No. 4,663,917, Japanese Patent Application Laid-Open No. Hei. 5-330504, Japanese Patent Application Laid-Open No. Hei. 9-12003 and so on relate to product-biting preventive devices of end-sealing/cutting devices in conventional longitudinal type bag forming, filling and packaging machines. The operation of the box motion slightly differs depending on the structure of the above-noted stripping plates.
Japanese Patent Application Laid-Open No. Hei. 5-330504 discloses an example of the product-biting preventive device of this type as a proposal of an assignee of this application. The disclosed product-biting preventive device for a longitudinal type bag forming, filling and packaging machine equipped with a box-motion type end-sealing (lateral-sealing)/cutting device as described in Japanese Patent Application Laid-Open No. Hei. 5-330504 will be described with reference to FIG.
19
. In the box-motion type end-sealing/cutting device, a pair of end-sealing (lateral-sealing) heaters
5
a
and
5
b
make a pair of symmetrical box motions (m
1
and m
2
) restricted by curved cam lines. The product-biting preventive device is arranged so that it is separated from the end-sealing/cutting device, and that a pair of stripping plates make a pair of symmetrical and longitudinally elongated box motions (m
3
and m
4
) restricted by two slide strokes. When the pair of end-sealing heaters
5
a
and
5
b
are returningly moved upwardly while being open widely, the pair of stripping plates
6
a
and
6
b
are moved upwardly in the vicinities of the insides of the pair of end-sealing heaters
5
a
and
5
b
while remaining open and then moved closer to each other to such a degree as to flatten the packaging cylindrical but not to clamp the packaging cylinder. When the pair of end-sealing heaters
5
a
and
5
b
are moved closer to each other while being moved downwardly from the upper, returned position, the pair of stripping plates
6
a
and
6
b
are moved downwardly so as not to interference with the end-sealing heaters, that is, the pair of stripping plates
6
a
and
6
b
make such a stripping motion as to forcibly push the product to be packaged below the cut position of the packaging plate by transferring the flattened position of the packaging cylinder from the upper side of the cut position to the lower side thereof. Then, the pair of stripping plates
6
a
and
6
b
and the pairs of shutters
7
a
and
7
b
are closed to flatten and clamp the packaging cylinder, the pair of end-sealing heaters
5
a
and
5
b
are closed to seal the packaging cylinder at two lateral-rows in the vicinities of upper and lower sides of the sealed position thereof, an
Armstrong, Westerman Hattori, McLeland & Naughton
Kawashima Packaging Machinery Ltd.
Sipos John
LandOfFree
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