Grooved Feed Roller Nip Design for Media Jamming
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Solution Overview
Problem
Media feeding apparatuses face issues with foreign matter adhering to rollers, reducing friction coefficients and feeding performance, especially when dealing with paper dust, filler, and coating agents, leading to decreased feeding efficiency and increased jamming.
Innovation Solution
The media feeding apparatus incorporates a feed roller and a separation roller with grooves arranged to maintain a contact area ratio of 0.5 or greater, ensuring at least one groove is always present in the nip region, along with a pressing portion to form a nip region and accommodate foreign matter, thereby enhancing the separation and feeding of media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a feed roller with grooves is used to accommodate foreign matter, then foreign matter accumulation is reduced, but the contact area between the roller and medium decreases, reducing friction coefficient and feeding performance
Solution Approach 1:
The feed roller surface is designed with non-uniform groove distribution, creating regions of different groove densities. The first region has a first groove density while the second region has a second groove density that is different from the first, allowing different areas to serve different functions: one area optimized for foreign matter accommodation while another maintains sufficient contact area for feeding performance
Solution Approach 2:
The feed roller surface is segmented into multiple regions with different groove characteristics. By dividing the roller surface into zones with varying groove densities, the design allows simultaneous optimization for both foreign matter accommodation and feeding performance in different segments of the same roller
2Quantity of substance
If the groove width is increased to accommodate more foreign matter, then foreign matter capacity increases, but the contact area ratio decreases below 0.5, reducing friction coefficient and feeding performance
Solution Approach 1:
Different regions of the feed roller are assigned different groove widths and densities. The first region has grooves with specific width and density optimized for foreign matter accommodation, while the second region has different groove parameters optimized for maintaining contact area ratio above 0.5 to ensure feeding performance
Solution Approach 2:
The roller surface is divided into functional zones where groove dimensions vary by region. This segmentation allows the roller to simultaneously provide both high foreign matter capacity in some areas and high contact area ratio in other areas, resolving the contradiction between quantity of foreign matter accommodation and feeding performance
3Object-affected harmful factors
If grooves are arranged to always have at least one groove in the nip region, then foreign matter accommodation is improved, but the groove pitch and width must be precisely controlled, increasing manufacturing complexity
Solution Approach 1:
The invention specifies concrete parameter ranges for groove pitch and width that ensure at least one groove is always present in the nip region. By defining specific numerical ranges rather than abstract requirements, the design translates the functional requirement into manufacturable specifications that guide groove spacing and dimensions
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
This configuration effectively prevents foreign matter from adhering to the rollers, maintains high friction coefficients, and reduces the occurrence of media slipping and jamming, ensuring consistent and efficient media feeding over a long period.
Implementation Method 1
a feed roller and a separation roller that separate and feed the medium one by one; the friction coefficient of the surface of the feed roller decreases, thus reducing the feeding performance
Data Source
AI summary
A media feeding apparatus includes: a feed roller, a separation roller, and a pressing portion to press one of the feed roller and the separation roller against the other to form a nip region. A surface of the feed roller has grooves extending in a width direction of the feed roller. The grooves are arranged with a pitch such that at least one groove is always present in the nip region during feeding of the medium. A width of each groove is 0.5 mm or greater and is set such that a contact area ratio is 0.5 or greater, the ratio being a value obtained by {(a surface area of the feed roller in the nip region−an area of the at least one groove of the feed roller in the nip region)}/(the surface area of the feed roller in the nip region). A surface of the separation roller has grooves extending in a circumferential direction of the separation roller.