Transporting Roller Protrusion Positioning for Paper Damage Prevention
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Solution Overview
Problem
Existing medium transporting rollers in recording apparatuses, such as facsimiles and printers, face issues with paper damage and accuracy due to concave and convex engaging sections, which can catch paper corners and reduce mechanical bonding strength when these sections are not properly positioned.
Innovation Solution
The medium transporting roller features a cylindrical shaft with protrusion sections that protrude in a direction intersecting with the axial direction, positioned to avoid contact with both ends of the paper, enhancing mechanical bonding strength and preventing paper damage by allowing the paper to pass smoothly without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If concave and convex engaging sections are provided in the bonding section of the medium transporting roller, then mechanical bonding strength is improved, but paper corners may be caught and damage may occur
Solution Approach 1:
The engaging sections are positioned only in the non-paper contact regions of the roller, creating local differentiation where bonding strength is enhanced in safe zones while paper contact zones remain smooth and free of engaging features, thus preventing paper damage
Solution Approach 2:
The solution moves the engaging sections from the paper contact dimension to the non-contact dimension, allowing multiple engaging sections to be provided along the axial direction without interfering with paper transportation, effectively resolving the contradiction between bonding strength and paper safety
2Strength
If multiple concave and convex engaging sections are provided in the axial direction, then mechanical bonding strength is further improved, but paper transportation accuracy may be reduced due to potential paper corner interference
Solution Approach 1:
Engaging sections are selectively placed only in non-paper contact regions along the axial direction, allowing multiple sections to enhance bonding strength while the paper contact regions maintain smooth surfaces for accurate paper corner guidance and transportation
3Object-affected harmful factors
If engaging sections are disposed outside the paper transporting region, then paper damage is prevented, but mechanical bonding strength is insufficient
Solution Approach 1:
The solution utilizes the axial dimension of the roller to place multiple engaging sections in the non-paper contact regions, thereby compensating for the reduced number of engaging sections in the bonding section while maintaining strong mechanical bonding without interfering with paper transportation
Data Source
AI summary
A recording apparatus includes: a transporting roller which includes a cylindrical shaft having one joint from one end portion to the other end portion of the shaft and transports a recording medium by being driven to rotate; a driven roller which holds and transports the recording medium with the transporting roller; and a recording section which performs recording on the recording medium, in which the joint includes a plurality of protrusion sections which protrude in a direction intersecting with an axial direction of the transporting roller, in which the plurality of protrusion sections are disposed in positions which do not come into contact with both end portions of the recording medium in the axial direction of the cylindrical shaft.