Sheet Conveying Rollers With Retractable Guide for Jam Removal
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Solution Overview
Problem
Existing sheet conveying apparatuses face challenges in efficiently handling sheet jams at the nip portion of conveying rollers, making it difficult for users to easily separate and address jams, which affects the stability and accuracy of sheet conveyance.
Innovation Solution
A pair of registration rollers with a bush member, urging member, and conveyance guide member configuration that allows for easy contact and separation by rotating the conveyance guide member between guiding and retracted positions, facilitated by a movable bush member and eccentric cam design, enabling simple removal of jammed sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conveyance guide member is fixed in the guiding position, then the sheet conveying accuracy is improved, but the difficulty of removing jammed sheets increases
Solution Approach 1:
The conveyance guide member is designed to be movable between a guiding position (for accurate sheet conveyance) and a retracted position (for easy jam removal). The guide member can be rotated about the rotation shaft, allowing it to dynamically change position based on operational needs. This resolves the contradiction by making the guide member's position adjustable rather than fixed.
Solution Approach 2:
The conveyance guide member is separated from the fixed structure and connected via a rotation shaft, allowing it to be independently positioned. This segmentation enables the guide member to be moved to different positions (guiding or retracted) without affecting the entire roller assembly, facilitating easy jam removal while maintaining conveying accuracy when needed.
2Stability of the object's composition
If the bush member is fixed, then the structural stability is improved, but the ability to adjust roller contact and separate rollers worsens
Solution Approach 1:
The bush member is designed to be movable along the radial direction of the first roller while still providing stable support. This mobility allows the second roller to be adjusted radially, enabling contact or separation between the rollers as needed. The bush member's movement capability provides the necessary adaptability while maintaining structural stability through its supported connection to the apparatus body.
Solution Approach 2:
The bush member acts as an intermediary between the fixed apparatus body and the second roller. It provides stable support while allowing radial movement, mediating between the need for structural stability and the need for roller contact adjustment. This intermediary function resolves the contradiction by decoupling the stability function from the adjustment function.
3Reliability
If the conveying rollers are always in contact, then the sheet conveying stability is improved, but the ease of accessing and removing jams worsens
Solution Approach 1:
The system allows the conveying rollers to dynamically change from a contacted state (for stable conveyance) to a separated state (for easy jam access). The movable bush member and rotatable conveyance guide member enable this state transition, resolving the contradiction by making roller contact adjustable rather than permanent.
Solution Approach 2:
The conveyance guide member can be rotated to a retracted position where it is extracted from the guiding position, allowing the second roller to be separated from the first roller. This extraction of the guide member enables access to the nip portion for jam removal while maintaining conveying stability when the guide member is in its guiding position.
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
Enables accurate positioning and stable pressing of rollers, allowing easy removal of jams and maintaining sheet conveyance stability, enhancing user convenience and operational efficiency.
Implementation Method 1
The urging member urges the bush member in such a direction that the second roller approaches the first roller
Implementation Method 2
The conveyance guide member is fitted to the rotation shaft of the second roller so as to be movable between a guiding position and a retracted position
Implementation Method 3
The bush member is supported on the body frame so as to be movable along the radial direction of the first roller
Data Source
AI summary
A sheet conveying apparatus includes a first roller, a second roller, a bush member, an urging member, and a conveyance guide member. The urging member urges the bush member in such a direction that the second roller approaches the first roller. The conveyance guide member is fitted to the rotation shaft of the second roller to be movable between a guiding position in which the conveyance guide member guides the sheet, and a retracted position in which the conveyance guide member is retracted from the guiding position, and it contacts, in the retracted position, a body frame to move the bush member against the urging force of the urging member in such a direction that the second roller separates from the first roller.