Dual-Shear Cross-Cut Assembly for Bag Web Separation
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Solution Overview
Problem
Existing bag making apparatuses face issues with misaligned cutting positions leading to protrusions and waste contamination during twice shearing, which can cause appearance degradation and potential harm, as well as inefficiencies in separating waste from the web.
Innovation Solution
A cross cut device with a cutter pair and movement devices that shears the web twice during an intermittent feed cycle, where the cutter pair moves upstream after the first shearing and feeds the web before the blade exceeds the shear height, ensuring the waste is separated effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If twice shearing is used to prevent protrusion generation, then manufacturing precision is improved, but waste is generated and may contaminate the web
Solution Approach 1:
The patent extracts and removes the waste generated during the second shearing operation by introducing a waste removal mechanism that separates the waste from the web before the web enters the sealing area, preventing contamination while maintaining the benefits of twice shearing for precise cutting
2Loss of substance
If the cutter pair moves upstream after first shearing, then waste separation is improved, but device complexity increases
Solution Approach 1:
The patent combines the horizontal movement function with the existing cutter pair assembly, integrating the waste separation capability into the cutting mechanism itself rather than adding a completely separate system, thus reducing overall device complexity while achieving effective waste removal
3Productivity
If web is fed before blade exceeds shear height, then productivity is improved, but manufacturing precision may be affected
Solution Approach 1:
The patent introduces dynamic control of the blade position and web feeding timing, allowing the system to adapt the feeding start time based on the blade's vertical position and shear height, thereby optimizing both productivity and cutting precision through real-time coordination
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
The solution prevents protrusions and waste contamination, enhances bag appearance, and increases production efficiency by minimizing waste sticking and allowing faster bag making cycles.
Implementation Method 1
a vertical movement device for vertically reciprocating the upper blade with respect to the lower blade to shear the web
Implementation Method 2
a horizontal movement device for horizontally moving the cutter pair between a first position for first shearing and a second position for second shearing
Implementation Method 3
a feed device for intermittently feeding a web in a longitudinal direction of the web
Data Source
AI summary
A cross cut device shears a web twice during a pause phase of an intermittent feed cycle. The cross cut device includes a cutter pair including an upper blade and a lower blade, a vertical movement device for reciprocating the upper blade with respect to the lower blade to shear the web, and a horizontal movement device for horizontally moving the cutter pair between a first position and a second position spaced upstream of the first position. During the reciprocation of the upper blade for the second shearing, the horizontal movement device starts to move the cutter pair from the second position to the first position after the upper blade reaches a lowermost height and before the upper blade exceeds a shear height. The feed device starts to feed the web after the cutter pair starts to move from the second position to the first position.