Medium Unit Pullback Assembly for Tray Detachment
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Solution Overview
Problem
The existing image processing apparatus with feeder trays that store rolled continuous media faces issues with feeding errors due to deformation of the loose end of the sheet roll when the feeder tray is detached and reattached, causing collisions with the casing or feed roller.
Innovation Solution
A medium unit with a tray, casing, and pullback assembly is designed to store a roll of medium, where the pullback assembly pushes the loose end of the continuous medium orthogonal to the rotation axis, preventing deformation and feeding errors during detachment and reattachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the feeder tray is detachably attached to the casing to simplify configuration and enable easy maintenance, then the ease of operation and device complexity are improved, but the loose end of the sheet may collide with the casing or feed roller during detachment, causing deformation and feeding errors
Solution Approach 1:
The cutter is configured to cut the continuous sheet into a predetermined length before the tray is detached from the casing. This preliminary cutting action ensures that the loose end of the sheet is contained within a safe length that cannot collide with or deform against the casing or feed roller during the detachment process, thereby maintaining feeding accuracy while enabling easy tray removal
2Device complexity
If the cutter is arranged on the casing instead of the feeder tray to simplify tray configuration, then the device complexity of the tray is reduced, but the loose end of the sheet becomes displaced and may collide with the casing during tray movement
Solution Approach 1:
The cutter on the casing performs a preliminary cutting action that creates a controlled loose end of predetermined length. This preliminary action prevents the harmful effect of collision by ensuring the sheet loose end is cut to a length that cannot reach or deform against the casing or feed roller during tray attachment and detachment movements
Data Source
AI summary
A medium unit, having a tray, a casing, and a pullback assembly, is provided. The tray stores a roll of medium, in which a continuous medium is rolled. The casing supports the tray detachably attached thereto. The pullback assembly pushes the continuous medium from a lower side to pull a loose end of the continuous medium unrolled from the roll of medium in conjunction with a detaching action to move the tray to detach from the casing in an orthogonal direction intersecting orthogonally with a rotation axis of the roll of medium.