Medium Feed Separation Roller Control to Prevent Multi-Feed

Solution Overview

Problem

Existing medium feed apparatuses suffer from multi-feed issues, necessitating user intervention to reset the medium, which affects user friendliness.

Innovation Solution

A medium feed apparatus with sensors and motors that control the rotation of separation rollers to prevent multi-feed by holding the rollers in place until the front end of the medium is detected and then reversing their direction to separate sheets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the separation roller rotates continuously in the opposite direction to the medium feed direction, then the medium separation function is maintained, but the separation roller causes harmful friction force on the medium during feed operation

Engineering Contradiction:

Improvemedium separation functionVSAvoidfriction force on medium

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The separation roller's rotation state is dynamically adjusted based on the feed operation phase. During the feed operation, the separation roller is rotated in the opposite direction to the medium feed direction to provide separation function. When feed operation stops, the separation roller is stopped to eliminate harmful friction force on the medium. This dynamic adjustment of the separation roller's rotation state resolves the contradiction between maintaining separation function and avoiding harmful friction.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the feed roller stops when multi-feed is detected, then the harmful effect of multi-feed is prevented, but the feed operation efficiency is reduced

Engineering Contradiction:

Improvemulti-feed preventionVSAvoidfeed operation efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

A rotation detection mechanism is provided to detect the rotation state of the separation roller. When multi-feed is detected through the rotation detection mechanism, the control unit stops only the feed roller while maintaining the separation roller's rotation in the opposite direction. This selective stopping prevents multi-feed harmful effects while preserving feed operation efficiency, as the separation function continues to operate.

Inventive Principle:

Principle #23Feedback

3Object-generated harmful factors

If the separation roller is stopped during feed operation, then the harmful friction force on the medium is eliminated, but the medium separation function is lost

Engineering Contradiction:

Improvefriction force on mediumVSAvoidmedium separation function

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

The separation roller's rotation state is dynamically adjusted based on the feed operation phase. During the feed operation, the separation roller is rotated in the opposite direction to the medium feed direction to provide separation function. When feed operation stops, the separation roller is stopped to eliminate harmful friction force on the medium. This dynamic adjustment of the separation roller's rotation state resolves the contradiction between maintaining separation function and avoiding harmful friction.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250326596A1Medium feed apparatus to put separation roller on hold until front end of medium passes separation part

Publication Date: 2025.10.23 PFU LTD

AI summary

A medium feed apparatus includes a first sensor, a second sensor, a third sensor to detect rotation of the separation roller, and a processor. The processor controls a motor to put the separation roller on hold from when starting the feed of the medium to when the second sensor detects a front end of the medium and generate the drive force from when the second sensor detects the front end of the medium to when the first sensor detects a back end of the medium, and controls the motor to stop the feed roller while generating the drive force if the third sensor detects rotation of the separation roller in the opposite direction to the medium feed direction during feed of the medium.