Sheet Material Detecting Device Width Detection Mechanism
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in accurately detecting the size of sheet materials at a low cost, particularly when handling small size papers, leading to reduced productivity and increased costs due to excessive heat in the fixing device and the need for complex detection mechanisms.
Innovation Solution
A sheet material detecting device with movable contact portions and a controller that detects the sheet material width based on the timing of movement between different positions, allowing for accurate size detection and adjustment of throughput to prevent excessive heat buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If one photo interrupter and two recording material contact members are used to detect small size paper, then the fixing device temperature can be controlled, but the throughput is reduced for all detected small size paper cases
Solution Approach 1:
The detection space is segmented into multiple regions with different contact members positioned at specific locations. The first contact member is positioned to detect narrow paper, while the second and third contact members are positioned to detect wide paper. This spatial segmentation allows the system to differentiate between paper widths and apply appropriate throughput control only when necessary, rather than uniformly reducing throughput for all small size paper detections.
2Measurement precision
If two photo interrupters and two recording material contact members are arranged on both right and left sides to detect small size paper, then detection accuracy is improved, but the device cost increases
Solution Approach 1:
The invention extracts the essential detection function to a single detection space where paper width can be determined by the pattern of contact member activations. Instead of duplicating detection mechanisms on both sides, the system uses three contact members (first, second, and third) positioned at different locations within one detection space. The controller analyzes which combination of contact members are activated to determine paper width, thereby achieving accurate detection with fewer components.
Solution Approach 2:
The detection system is designed to be universal by using a single detection space that can identify both narrow and wide paper through different contact member activation patterns. The same three contact members serve multiple functions: the first contact member detects narrow paper, while the second and third contact members detect wide paper. This multi-functional design eliminates the need for separate detection mechanisms for different paper types, reducing overall system complexity while maintaining detection accuracy.
Data Source
AI summary
A sheet material detecting device includes a leading end flag, a pair of middle size flags, a pair of large size flags which take stand-by positions and operating positions by contacting a sheet, respectively. Each of middle size flags changes from the stand-by position to the operating position linking with changing to the operating position of each of large size flags. A link is moved from a first position to a second position in a case that both of middle size flags take the operating positions and is restricted in movement to the second position in a case that both of middle size fags do not take the operating portions. A controller detects a width of the sheet base on a timing of the operating position of the leading end flag and a timing of movement of the link from the first position to the second position.