Package making – With contents treating – Vacuum or inert atmosphere
Patent
1995-09-06
1996-12-10
Sipos, John
Package making
With contents treating
Vacuum or inert atmosphere
53 79, 531395, 156145, B65B 3100
Patent
active
055819834
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a gas injection device for a gas bag having serial closed cells.
PRIOR ART
A gas bag having serial closed cells to be used as a cushioning material for packaging purpose or air mattress is known from, for example, Japanese Patent Public Disclosure (KOKAI) No. 01(1989)-153829.
The gas bag having serial closed cells disclosed therein includes a belt-like bag body consisting of a front sheet and a back sheet superposed one another. The bag body includes serial closed cells extending along the length thereof. The bag body also includes a passage extending along the length thereof for supplying gas into each individual closed cell. A check valve is disposed between the passage and each individual closed cell.
The gas bag prior to use is not supplied with gas. The front sheet and the back sheet are superposed one another in close contact relationship so as to form a continuous, belt-like configuration which is wound in a roll.
In use, the roll of gas bags is unwound and cut by a predetermined length so as to form a gas bag of a finite length having serial closed cells. One end of the passage for receiving gas is closed. Then, the opposite end of the passage is fitted with an air nozzle. A quantity of gas such as air is injected into the passage. The gas injected is flown from the passage into the individual closed cells, whereby the closed cells are inflated. Any leakage of the gas supplied to the individual closed cells is prevented by means of the check valves.
The thus inflated gas bag is used as a cushioning material for packaging purpose or an air mattress.
Conventionally, the above-mentioned gas injection has been performed by means of a manual operation.
In the gas bag prior to gas injection, the front sheet and the back sheet are superposed one another in a close contact relationship, so that the passage for gas injection is also sealingly closed.
Accordingly, it is necessary to release the sealingly closed condition of the passage when the air nozzle is fitted in the opening of the passage. The release operation essentially depends upon a manual operation.
Thus, the gas injection operation has been totally performed by a manual operation in prior art.
It is noted, however, that such manual operation is not efficient. Accordingly, mechanization realizing a full automatic gas injection operation is desired.
The main object of the invention is to provide a gas injection device for a gas bag having serial closed cells which is capable of opening a sealingly closed passage so as to perform automatic fitting of a nozzle relative to the passage.
SUMMARY OF THE INVENTION
In order to achieve the above object, the invention provides a gas injection device for supplying gas into a gas bag, the gas bag including a front sheet and a back sheet superposed one another to form a belt-like bag body, the bag body including a plurality of closed cells serially arranged in the length of the gas bag, the bag body also including a passage extending along the length of the gas bag for supplying gas into the individual closed cells, the bag body further including a check valve between the passage and the individual closed cells, the gas injection device is featured by a core adapted to be inserted into the passage, the core having a longitudinally intermediate portion of a reduced diameter; at least two pinch rollers for pressingly clamping the gas bag inwardly from the front sheet and back sheet of the gas bag at the position of the longitudinal intermediate portion of a reduced diameter of the core, so as to drive the gas bag in the longitudinal direction; a nozzle adapter adapted to be withdrawably insertable into the opening of the passage which is opened by the core inserted therein; a displacer means for displacing the nozzle adapter in a manner in which the nozzle adapter is not displaced from the opening of the passage, when the gas bag is driven in the longitudinal direction; a gas supply means adapted to be connected with the nozzle adapter; a nip means for pressingly
REFERENCES:
patent: 3389534 (1968-06-01), Pendleton
patent: 3817803 (1974-06-01), Horsky
patent: 3938298 (1976-02-01), Luhman et al.
patent: 4017351 (1977-04-01), Larson et al.
patent: 4597244 (1986-07-01), Pharo
patent: 5070675 (1991-12-01), Chuan-Shiang
patent: 5121595 (1992-06-01), Shore
patent: 5216868 (1993-06-01), Cooper et al.
Shinwa Corporation
Sipos John
Tolan Ed
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