Transport Device Cam Positioning for Recording Media
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Solution Overview
Problem
The existing transport devices face difficulties in positioning the cam portion with respect to the first rotating body, particularly when it is provided on a shaft portion, which affects the separation mechanism between the first and second rotating bodies at the recessed portion.
Innovation Solution
A transport device design where the cam portion is positioned on the side surface of a cylindrical portion of the first rotating body, allowing easier alignment and separation of the second rotating body from the first rotating body at the recessed portion, facilitating the transportation of a recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cam portion is provided on the shaft portion of the first rotating body, then the separation mechanism can be implemented, but the positioning accuracy of the cam portion becomes difficult to achieve
Solution Approach 1:
The cam portion is relocated from the shaft portion (axial direction) to the cylindrical portion (radial direction). This dimensional change allows the cam portion to be positioned on the outer peripheral surface, where it can be more easily aligned with the recessed portion and contact portion, thereby improving positioning accuracy without complicating the overall mechanism.
2Ease of operation
If the cam portion is provided on the shaft portion, then the separation function is achieved, but the ease of operation and alignment is reduced
Solution Approach 1:
By moving the cam portion to the cylindrical portion's outer peripheral surface, the alignment between the cam portion, recessed portion, and contact portion becomes more straightforward. This spatial reconfiguration improves ease of operation while maintaining reliable separation functionality.
Solution Approach 2:
The contact portion acts as an intermediary element that engages with the cam portion on the cylindrical surface. This intermediary mechanism facilitates smooth and reliable separation between the first and second rotating bodies, enhancing both ease of operation and operational reliability.
3Manufacturing precision
If the cam portion is positioned on the cylindrical portion side surface, then positioning accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
The cam portion is integrated directly onto the outer peripheral surface of the cylindrical portion, merging two functional elements into a unified structure. This integration improves positioning accuracy by establishing a fixed reference surface while avoiding the need for separate mounting brackets or positioning mechanisms that would increase structural complexity.
Data Source
AI summary
A transport device includes: a first rotating body including a shaft portion, a cylindrical portion on an outer periphery of the shaft portion, and a recessed portion in an outer surface of the cylindrical portion; a second rotating body capable of moving from the first rotating body while contacting an outer surface of the first rotating body and nipping a recording medium; a transport unit that includes a holding portion that holds the recording medium, and that transports the recording medium by moving the holding portion in a rotation direction of the first rotating body while the holding portion is disposed in the recessed portion; and a moving mechanism including a cam portion on a side of the cylindrical portion and a contact portion connected to the second rotating body and that comes into contact with the cam portion to separate the second rotating body from the first rotating body.