Package making – Methods – Filling preformed receptacle
Reexamination Certificate
1997-06-10
2001-05-08
Coan, James F. (Department: 3721)
Package making
Methods
Filling preformed receptacle
C053S284700, C141S316000
Reexamination Certificate
active
06226963
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORE RESEARCH OR DEVELOPMENT
Not Applicable
The present invention relates to bag clamping apparatus and more particularly to a modification of the sequencing of the operation of the side sealing air cylinders of U.S. Pat. No. 5,301,492 to allow de-aeration of a bag externally rather internally.
BACKGROUND OF THE INVENTION
In the aforesaid U.S. patent, air in a bag being filled escapes internally of the filling nozzle and reduces the area for product flow.
It is a primary object of the present invention to utilize in its entirety the apparatus illustrated in the aforesaid patent but to modify the sequencing of an element of the apparatus to permit air to escape externally through small open edge regions of the bag that are not closed until the bag is partially full.
BRIEF SUMMARY OF THE INVENTION
The structure of the apparatus employed in the present invention is identical to that illustrated in U.S. Pat. No. 5,301,492 and the description of operation is also identical except as specifically modified herein. Thus the description of operation of the device of the patent is incorporated herein by reference.
The only change relative to the device of the patent is in the sequencing of the gusset forming air cylinder
21
of
FIG. 2
of the patent. In the patent the side sealing air cylinder caused the actuating elements
25
to grip and seal the edge of the bag against the end faces
3
of the filling spout and thus seal the bag. In consequence evacuation of air was internal.
According to the present invention this air cylinder is independently controlled such that the air cylinder is initially driven to extend by a low pressure, 1 bar, to maintain elements
25
away from the end faces
3
whereby openings in the edge regions of the bag are provided through which air may escape during filling externally to atmosphere. After a predetermined time which varies with bag size, the valve is switched to allow high pressure (6 bars) to be applied to cylinder
21
to rapidly bring the arms
25
against the end faces
3
and seal the bag. This action occurs when the bag is partially full. The degree of filling is a function of the material filling the bag. As determined by grain size, weight of the material, the bag is sealed at a time before dust and fines begin to escape.
The change in operation is achieved by the addition of three valves, two three-way, one four-way valve and a pressure regulator to control air flow to air cylinder
21
.
The above and other features, objects and advantages of the present invention, together with the best means contemplated by the inventors thereof for carrying out the invention will become more apparent from reading the following description of a preferred embodiment and perusing the associated drawings in which:
REFERENCES:
patent: 4432186 (1984-02-01), McGregor
patent: 4706441 (1987-11-01), Chervalier
patent: 5115619 (1992-05-01), Lieder
patent: 5301492 (1994-04-01), Kader
Hemphill Robert
Rychlak Gerald J.
Chronos Richardson, Inc.
Coan James F.
Rose Howard L.
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