Package making – Apparatus for forming or partially forming receptacle and...
Patent
1977-10-19
1978-09-05
Spruill, Robert Louis
Package making
Apparatus for forming or partially forming receptacle and...
53384, B65B 910
Patent
active
041109562
ABSTRACT:
A roll of flattened tubular synthetic plastic stock is unwound by the pulling force of clamping devices mounted on a vertically movable frame and engaging the opposite faces of still flattened portions of the tubular stock. The unwound flattened tubular stock is preferably advanced downwardly between bag slitting, wall separating and bag sealing devices also carried by the framework. A lower pair of clamping members forms a temporary seal along the entire width of the tubular stock at a point adjacent to but above the bottom margin of a bag-forming portion thereof until a permanent seal is formed beneath the same and above another pair of lower clamping members which engage the upper margin of a previously filled bag-forming portion of the same. A lower slitting device slits the bag between the latter pairs of clamping members while the clamping members are in operative position. The framework is moved bodily between an uppermost position where a spout-receiving slit is formed by an upper slitting device in portions of the tubular stock to constitute or to be located adjacent to the upper margin of a bag to be formed therein, and the confronting walls of the portion of the tubular stock at and below the slit are separated preferably by engagement therewith by a pair of spaced pointed projections which bite into the bag and are then moved apart to separate the walls. One or more spouts carried by the framework are then passed downwardly through the slit as the framework, with all the other devices carried thereby, is moved bodily downwardly to a bottommost position while the sealed interior of the bag-forming portion of the tubular stock is filled. A permanent bottom seal is formed and the lower clamping members are released to free the previously filled bag-forming portion of the stock which drops by force of gravity onto a receiving platform or the like. Bags of different length are formed by merely varying the distance between the uppermost and bottommost positions of the framework.
REFERENCES:
patent: 3269087 (1966-08-01), Cloud et al.
patent: 3481102 (1969-12-01), Dolman
patent: 3529400 (1970-09-01), Takagaki
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