Slit Device Web Cutting Positioning Within Nipping Area
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Solution Overview
Problem
In existing slit devices, the cutting position is upstream of the nipping area, leading to web buckling and reduced cutting accuracy due to the web not being nipped by the pressing rollers and members during cutting.
Innovation Solution
A slit device configuration with a first transport section and a second transport section that nip the web in the transport direction, with a cutting section positioned between them, ensuring the cutting occurs within the nipping area or downstream, using a driving blade and driven blade setup where the driven blade is downstream of the driving blade's rotating shaft, and the driven blade is trapezoidally shaped with a smaller surface on the second transport roller pair side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cutting position is positioned upstream of the nipping area, then the cutting operation can be performed independently, but the web is apt to buckle and cutting accuracy is reduced
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the cutting section downstream of or within the nipping area rather than upstream. This reversal allows the web to be nipped and stabilized before cutting, eliminating buckling while maintaining cutting independence through the specific configuration where the cutting blades operate in the nipped region without interfering with the nipping function
2Device complexity
If the cutting section is positioned upstream of the nipping area, then the structure can be simplified, but the web stability during cutting is reduced
Solution Approach 1:
The patent merges the cutting function with the nipping function by positioning the cutting section within or downstream of the nipping area. The cutting blades are arranged to operate within the nipped region where the web is already stabilized by the pressing rollers, combining both functions in a coordinated manner without requiring separate stabilization mechanisms
3Manufacturing precision
If the cutting position is within the nipping area, then web stability is improved, but the device complexity increases
Solution Approach 1:
The patent implements multi-functionality where the nipping rollers serve dual purposes: both transporting the web and stabilizing it for cutting. The cutting section is designed to operate within the nipped region, allowing the same nipping mechanism to provide both transport and stabilization functions, thereby improving cutting accuracy without proportionally increasing device complexity
Data Source
AI summary
A slit device including a first transport section which transports a web in a transport direction while nipping the web, a second transport section which is disposed in parallel with a direction intersecting the transport direction of the first transport section and which transports the web in the transport direction while nipping the web, and a cutting section which is disposed between the first transport section and the second transport section in a direction intersecting the transport direction and which cuts the web along the transport direction, in which a cutting position at which the web is cut by the cutting section is a position within a nipping area where the first transport section nips the web along the transport direction, or is a position downstream of the nipping area in the transport direction.