Nipper-Based Sheet Thickness Detection for Narrow Media Widths
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Solution Overview
Problem
Conventional sheet characteristic detection devices suffer from reduced accuracy in detecting sheet thickness when the width of the recording medium is shorter than the nip portion, leading to inconsistencies in thickness measurement.
Innovation Solution
A sheet characteristic detection device that includes a nipper, a sheet thickness detection sensor, and a hardware processor that corrects the detected thickness based on the length of the recording medium in the width direction, using a correction coefficient to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional nipper is used to detect sheet thickness, then the detection structure is simple, but the detection accuracy deteriorates when the sheet width is shorter than the nip width
Solution Approach 1:
The patent applies parameter changes by introducing a correction coefficient that varies based on the sheet width-to-nip-width ratio. The hardware processor calculates a correction coefficient based on the ratio of the sheet width in the width direction to the nip width, and uses this coefficient to correct the detected thickness value. This allows the system to maintain high detection accuracy across different sheet sizes without changing the physical detection structure.
2Device complexity
If the sheet width is shorter than the nip width, then the nipper structure remains simple, but the thickness measurement becomes inaccurate
Solution Approach 1:
The patent implements feedback by continuously monitoring the sheet width and using this information to adjust the thickness measurement. The hardware processor calculates the ratio of the detected sheet width to the nip width, and uses this ratio to determine an appropriate correction coefficient. This feedback mechanism ensures that the thickness measurement remains consistent and accurate regardless of whether the sheet width is shorter than, equal to, or longer than the nip width.
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 device accurately determines sheet thickness by accounting for variations in width, thereby improving detection precision even when the sheet width is shorter than the nip width.
Implementation Method 1
a sheet thickness detection sensor that detects displacement of the recording medium in a thickness direction at the nipper
Data Source
AI summary
A sheet characteristic detection device includes, a nipper that nips a recording medium; a sheet thickness detection sensor that detects displacement of the recording medium in a thickness direction at the nipper; and a hardware processor that calculates a thickness of the recording medium based on a detection value detected by the sheet thickness detection sensor. The hardware processor corrects the detection value detected by the sheet thickness detection sensor or the thickness according to a length of the recording medium in a width direction orthogonal to a conveyance direction or the length of a portion of the recording medium in contact with the nipper in the width direction, and acquires the thickness of the recording medium.