Variable Speed Paper Reversal Mechanism for Jam Prevention
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Solution Overview
Problem
Printers used for printing on both sides of checks or similar sheet-like paper face challenges in reducing processing time while preventing paper jamming, especially due to complex conveyance paths and varying paper lengths.
Innovation Solution
A paper conveyance device that measures the length of cut paper and adjusts its conveyance speed within the reversal mechanism, conveying at a faster speed when the paper length is less than a predetermined length and slowing down when it exceeds this length to prevent jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the check is conveyed at a low speed in the reversal mechanism, then paper jamming is prevented, but processing time increases and productivity decreases
Solution Approach 1:
The patent applies dynamics by making the conveyance speed variable rather than fixed. The reversal mechanism automatically adjusts conveyance speed based on detected paper length: using a first (higher) speed for shorter papers and a second (lower) speed for longer papers. This dynamic speed adjustment resolves the contradiction by optimizing speed for each paper type, preventing jams on long papers while maintaining high productivity for short papers.
Solution Approach 2:
The patent changes the parameter of conveyance speed based on the detected paper length. By measuring paper length and selecting appropriate speed parameters (first speed for short papers, second speed for long papers), the system adapts operating conditions to prevent jams while maximizing processing efficiency for different paper types.
2Adaptability or versatility
If the conveyance path is made complicated to enable reversal, then front and back surfaces can be reversed, but paper jamming risk increases
Solution Approach 1:
The patent mitigates the jamming risk from the complicated reversal path by changing the conveyance speed parameter. The system detects paper length and automatically selects appropriate speeds (first speed for short papers, second speed for long papers) during reversal conveyance, ensuring that papers traverse the complex path at safe speeds to prevent jams while maintaining reversal functionality.
3Productivity
If the conveyance speed is increased to reduce processing time, then productivity improves, but paper jamming occurs
Solution Approach 1:
The patent resolves this contradiction through dynamic speed adjustment based on paper length detection. The system uses a first (higher) conveyance speed for short papers to maximize productivity, and automatically switches to a second (lower) speed for long papers to prevent jams. This dynamic adaptation eliminates the need to choose between speed and reliability, achieving both high productivity and jam prevention.
Solution Approach 2:
The patent implements feedback by detecting paper length and using this information to control conveyance speed. The detection unit measures paper length, and the control unit adjusts speed accordingly, creating a closed-loop system that prevents jams while optimizing processing time based on actual paper characteristics.
Data Source
AI summary
According to one embodiment, a paper conveyance device includes a conveyance unit configured to convey long cut paper in a longitudinal direction, a measuring unit configured to measure a length of the cut paper in the longitudinal direction, which is conveyed by the conveyance unit, a reversal mechanism that reverses a front surface and a back surface to each other with conveying the cut paper, and a reversal unit configured to convey the cut paper in the reversal mechanism. The reversal unit conveys the cut paper at a first speed when the measuring unit measures that the length of the cut paper is less than a predetermined length, and conveys the cut paper at a second speed slower than the first speed when the measuring unit measures that the length of the cut paper is equal to or more than the predetermined length.