Bag folding method and bag folding device for bag making machine

Abstract

The invention discloses a bag folding method and a bag folding device for a bag making machine. The bag folding device comprises a machine frame, a front corner folding plate, a front folding plate, arear folding plate, an insertion plate and a guiding plate, wherein the front corner folding plate, the front folding plate, the rear folding plate, the insertion plate and the guiding plate are mounted on the upper portion of the front end of the machine frame; an indentation plate is arranged on the front portion of the insertion plate; the lower portion of the indentation plate is translated backwards; a notch is formed in the middle of the translated portion; a longitudinal pressing bar is arranged in the middle of the notch; the indentation plate and the pressing bar are driven by air cylinders arranged on an n-shaped bracket; and a gap corresponding to the pressing bar is arranged in the middle of the front end of the front folding plate. The bag folding device has the advantages that an indentation is pressed at the front folding line by the indentation plate before the front folding plate is operated, the folding line can be effectively prevented from arching when being folded; the pressing bar is pressed downwards to press a folded portion of a plastic bag before the front folding plate is reset after folding, the folded portion of the plastic bag is effectively preventedfrom being taken up when the front folding plate is reset (reversely stretched forwards), and the folding quality and work efficiency are improved.

Description

technical field [0001] The invention relates to a bag folding method of a bag making machine and a bag folding device of the bag making machine for implementing the method, which are used for folding the stacks of plastic bags after the plastic bags are punched in the production process of the bag making machine, so as to Convenient subsequent packaging. Background technique [0002] The punching process is the last process of the plastic bag making machine, which can be set independently in structure, and is used to punch one end of the stacks of plastic bags output by the previous step of the bag making machine out of the U-shaped opening to form a vest-style bag. plastic bag. The folding of a plastic bag is generally to fold the two straps of the plastic bag toward the center, then fold one end (about one-third) of the folded two straps up again, and finally fold the opposite third of the straps. Fold one up and press the opposite folded part underneath. The existing b...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned bag folding device can well complete the three-fold or four-fold folding action, but when the front flap is folded, since the folding line has no indentation, the folding line is prone to arching during folding, resulting in folding failure; in addition, the current When the flap is folded and reset, due to static electricity, the front flap will easily lift up the front of the folded plastic bag, causing the plastic bag to scatter, affecting the folding quality and work efficiency

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