Sheet Conveying Device Arm Detection for Curl Variations
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Solution Overview
Problem
Existing sheet conveying devices face challenges in accurately detecting the leading or trailing end of sheets on conveying paths due to variations in sheet routes and curling, leading to errors in conveyance position judgment, which affects image processing accuracy in document reading and recording.
Innovation Solution
A sheet conveying device with a conveying path having first and second guide faces and detecting units, each comprising arm members that rotate to project or retract based on sheet contact, outputting signals to correctly judge the sheet's position, ensuring accurate detection and image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single detecting unit is used to detect sheet position, then the device complexity is reduced, but the measurement precision deteriorates due to variations in sheet routes and curling
Solution Approach 1:
The detecting unit is divided into multiple arm members (first arm member and second arm member) that are rotatably supported at different positions. Each arm member independently detects sheet contact, and their combined signals provide comprehensive position detection that accounts for sheet route variations and curling, thereby improving measurement precision without requiring a single complex detecting unit
Solution Approach 2:
Multiple detection signals from different arm members are merged and evaluated together to determine sheet position. The control unit combines the outputs from the first sensor (detecting first arm member position) and second sensor (detecting second arm member position) to make a comprehensive judgment about sheet end position, improving accuracy while using simple individual detecting components
2Measurement precision
If arm members are positioned to detect both guide faces, then the measurement precision improves, but the device complexity increases due to multiple arm members and sensors
Solution Approach 1:
The detecting unit is segmented into multiple independent arm members, each with its own sensor. The first arm member with first sensor detects conditions near the first guide face, while the second arm member with second sensor detects conditions near the second guide face. This segmentation allows comprehensive detection of sheet position variations without requiring a single overly complex detecting structure
Solution Approach 2:
The arm members are designed to automatically respond to sheet contact through their own mechanical movement. When the sheet contacts an arm member, it naturally rotates toward the guide face, triggering the sensor without requiring additional actuators or complex control mechanisms. This self-service approach improves detection accuracy while keeping each individual detecting component simple
Data Source
AI summary
A sheet conveying device of an aspect of the invention includes: a conveying path that allows a sheet to be conveyed and includes a first guide face and a second guide face opposing and apart from each other at a predetermined interval; a sheet conveying unit disposed on the conveying path; and a first detecting unit and a second detecting unit arranged opposing each other across the conveying path. Each of the first and second detecting unit includes: an arm member rotatably supported to take a posture where the arm member projected from the guide face to the conveying path and a posture where the arm member is retracted from the conveying path by rotating toward the guide face; and a first sensor that outputs a signal depending on the posture of the arm member.