Separating Claw Unit With Elastic Cushion Guide
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Solution Overview
Problem
In image forming apparatuses, the trailing end of recording paper sheets often contaminates separating claws with toner due to direct impact, leading to toner dropout and jamming issues, which conventional techniques like sheet trailing end restricting members and star-shaped rollers fail to adequately address.
Innovation Solution
A separating claw unit comprising a separating claw and a cushion guide, where the cushion guide is elastically and displaceably positioned to absorb the impact of the trailing end of the recording paper sheet, preventing toner dropout from the separating claws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separating claws are provided to peel the recording paper sheet off the photosensitive drum, then the paper sheet can be separated effectively, but toner adheres to and becomes deposited on the separating claws causing contamination
Solution Approach 1:
A cushion guide is introduced as an intermediary component between the trailing end of the recording paper sheet and the separating claw. The cushion guide absorbs the impact of the trailing end, preventing direct contact with the separating claw, thereby eliminating toner contamination while preserving the paper sheet separation function
Solution Approach 2:
The cushion guide is positioned upstream of the separating claw to provide cushioning before the trailing end of the paper sheet can impact the separating claw. This preliminary cushioning prevents toner from being deposited on the separating claw in the first place
2Object-affected harmful factors
If sheet trailing end restricting members are provided to prevent trailing end impact on separating claws, then toner contamination is reduced, but the structure becomes more complex
Solution Approach 1:
The cushion guide is merged with the separating claw assembly, forming an integrated unit where the cushion guide serves as a protective extension of the separating claw structure. This merging reduces overall device complexity compared to adding separate restricting members
Solution Approach 2:
The cushion guide serves multiple functions: it guides the trailing end of the paper sheet, absorbs impact, prevents toner contamination, and protects the separating claw. This multi-functionality eliminates the need for separate trailing end restricting members, simplifying the overall structure
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 cushion guide effectively reduces the impact of the trailing end of the recording paper sheet, preventing toner contamination and minimizing the risk of jamming, thus enhancing the design flexibility and reducing operational costs compared to conventional methods.
Implementation Method 1
The cushion guide is provided next to the separating claw to extend beyond the separating claw in the direction away from the surface of the image carrier, held elastically and displaceably away from the surface of the image carrier
Data Source
AI summary
A separating claw unit includes: a separating claw provided beside and against a surface of an image carrier on which a toner image to be transferred to a recording paper sheet in a nip area between the image carrier and a transfer section is to be formed, the separating claw being configured to separate the recording paper sheet having passed through the nip area off the surface of the image carrier in a direction away from the surface of the image carrier; and a cushion guide provided next to the separating claw to extend beyond the separating claw in the direction away from the surface of the image carrier, held elastically and displaceably away from the surface of the image carrier, and configured to come into contact with the recording paper sheet to guide the recording paper sheet downstream in a direction of conveyance of the recording paper sheet.