Driven Spur Geometry for Recording Media Transport
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Solution Overview
Problem
Existing recording apparatuses face issues with jamming and dirt transfer during the transportation of recording media, as the skew roller tends to scrape images and adhere recording material, while spurs with small contact areas lead to jamming due to poor sliding properties.
Innovation Solution
A recording apparatus featuring a driven spur with teeth that have a specific front end surface length and angle configuration, allowing the recording medium to be nipped between the driven spur and a driving roller, preventing jamming and dirt transfer by optimizing the contact area and angle for smooth transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a skew roller is used to transport the recording medium, then the recording medium can be guided along the guide surface, but the skew roller scrapes the recorded image and adheres recording material to its surface
Solution Approach 1:
The skew roller surface is segmented into multiple circumferential grooves, dividing the continuous contact surface into discrete V-shaped channels. This segmentation reduces the effective contact area between the roller and recording medium, preventing image scraping while maintaining guidance function through the grooved structure
Solution Approach 2:
The roller surface is given non-uniform local quality through the V-shaped groove pattern. The groove walls provide localized contact points for guidance, while the groove bottoms and ridges minimize contact with the recorded surface. This local quality differentiation allows the roller to guide the medium without scraping the image area
2Object-generated harmful factors
If a spur with small contact area is used instead of a skew roller, then dirt transfer is prevented, but the recording medium jams during transportation
Solution Approach 1:
The spur is designed with multiple teeth segmented around its circumference, each tooth creating a small V-shaped contact zone. This segmentation provides numerous discrete contact points that guide the recording medium without creating large-area contact, preventing both dirt transfer and jamming through distributed minimal contact
Solution Approach 2:
The spur teeth are designed with curved V-shaped profiles rather than sharp edges, creating smooth rounded contact zones. This curvature allows the recording medium to slide smoothly over the tooth surfaces without catching or jamming, while the V-shape maintains guidance function
3Force
If the skew roller makes contact with the recording medium to apply thrust load, then the recording medium is drawn to the guide surface, but the recording medium slides away from the guide surface due to easy sliding properties
Solution Approach 1:
The V-shaped groove structure segments the contact interface into inclined walls that convert the thrust load into directional guidance forces. The groove walls provide friction-based resistance to sliding while the V-geometry channels the recording medium toward the guide surface, balancing thrust application with sliding control
Data Source
AI summary
There is provided a recording apparatus including a recording section and a transport mechanism, which has a guide surface, a driving roller, and a driven spur. A length X (mm) of a front end surface of the driven spur and an angle Y of the driven spur are configured to be within a first area surrounded by a mathematical expression 1 which is X>0, a mathematical expression 2 which is Y>0, a mathematical expression 3 which is Y=40.1X+1.6, a mathematical expression 4 which is Y=−9.0X+5.6, a mathematical expression 5 which is Y=−12.1X+6.0, and a mathematical expression 6 which is Y=−14.7X+7.1.