Envelope Sheet Third Area Length for Roller Feed Stability
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Solution Overview
Problem
Automated enveloping machines often misalign printed sheets when feeding them into envelopes due to the short length of the third area of the envelope sheet, causing inadequate stuffing and potential sheet jams.
Innovation Solution
The envelope sheet is designed with a third area that is equal to or longer than the distance between the feed rollers, featuring an adhesive area perpendicular to the feed direction to prevent misalignment and ensure stable feeding, and a flap that can be adhered to this area to prevent curl-ups and wavings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the third area of the envelope sheet is made short to reduce material usage, then the envelope sheet can be fed more efficiently, but the printed sheet contacting with the driven roller cannot be fed forward properly causing misalignment
Solution Approach 1:
The patent changes the length parameter of the third area to be equal to or longer than the distance between feed rollers, which resolves the feeding mechanism's inability to properly transport the driven roller contact area while maintaining efficient production
2Manufacturing precision
If the third area is made long to prevent misalignment, then the printed sheet can be fed forward properly, but the envelope sheet requires more material and increases complexity
Solution Approach 1:
The patent establishes a specific parameter range for the third area length (equal to or longer than the distance between feed rollers) that prevents misalignment while avoiding excessive material usage and structural complexity
3Device complexity
If the envelope sheet is fed by a driven roller passively rotated by the driving roller, then the feeding mechanism is simplified, but only the envelope sheet contacting with the driving roller can be fed forward
Solution Approach 1:
The patent modifies the length parameter of the third area to ensure sufficient contact length with the driven roller, which enables the simplified feeding mechanism to reliably transport the envelope sheet with content without misalignment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration prevents misalignment of the content within the envelope, reduces the risk of sheet jams, and allows for stable feeding and sealing of the envelope, enhancing the efficiency of the automated enveloping process.
Implementation Method 1
an adhesive pasted area formed on the third area and extended along a direction perpendicular to the envelope feed direction to be adhered with the flap
Implementation Method 2
fed forward together with the content stored therein by at least two pairs of the feed rollers
Data Source
AI summary
The envelope sheet includes a first area provided with a flap, a second area extended from the first area with interposing a first fold line, a third area extended from the second area with interposing a second fold line, and an adhesive pasted area formed on the third area and extended along a direction perpendicular to a feed direction. The envelope sheet is configured to be, in a stuff and seal apparatus, preliminarily folded at the second fold line while a content is stuffed thereinto, and then fed forward together with the content by at least two pairs of the feed rollers. A length of the third area along the feed direction is made equal-to or longer-than a distance between the two pairs of feed rollers. According to the envelope sheet, the content can be prevented from being inadequately stuffed into an envelope transformed from the envelope sheet.