Printer Movable Unit Limiter Prevents Paper Damage
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Solution Overview
Problem
Medium transporting apparatuses face difficulties in removing paper sheets from the transportation path without causing crumpling or tearing, especially when the paper is warped or falls out of the path, leading to potential jams and usability issues.
Innovation Solution
Incorporating a limiter mechanism with engagement members that restrain the movable unit from returning to the storage position until the cover is closed, allowing users to visually check and remove any inappropriate paper states, thereby reducing the risk of paper damage and facilitating smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the movable unit is returned to the storage position without removing the paper sheet in the space, then the movable unit can be quickly returned to its original position, but the paper sheet may become caught between the movable unit and the housing, causing it to be crumpled or torn
Solution Approach 1:
The limiter mechanism applies a restraining force in advance to prevent the movable unit from moving toward the storage position when the cover is open. This preliminary anti-action stops the harmful sequence before it can occur, eliminating the risk of paper sheet damage while still allowing quick return when the cover is closed.
Solution Approach 2:
The limiter acts as an intermediary mechanism between the movable unit and the cover. It mediates the movement control by detecting the cover's open/closed state and accordingly allowing or restraining the movable unit's movement, thus preventing paper damage without permanently blocking quick return.
2Object-affected harmful factors
If the movable unit is restrained from moving toward the storage position when the cover is open, then the likelihood of paper sheet damage is reduced, but the operation becomes more complex
Solution Approach 1:
The limiter mechanism merges the cover's positional information with the movable unit's movement control into a single integrated system. The engagement member and limiting member work together as one unified mechanism that automatically detects cover state and applies appropriate restraint, avoiding the need for separate sensors, motors, or control systems.
Solution Approach 2:
The limiter mechanism is self-actuating based on the cover's position. When the cover is open, the engagement member automatically engages with the limiting member to restrain movement. When the cover is closed, the engagement member automatically disengages to allow movement. This self-service operation eliminates the need for external control systems.
3Ease of operation
If the cover is kept open to allow visual checking of the space, then the user can remove inappropriate paper states, but the movable unit cannot be returned to the storage position
Solution Approach 1:
The limiter mechanism performs a preliminary check by automatically restraining the movable unit when the cover is open. This preliminary action alerts the user to maintain the cover open for visual inspection, and only when the cover is closed does the restraint release, allowing the user to efficiently return the movable unit without risk of damage.
Data Source
AI summary
A printer includes a housing, a cover, and a movable unit. The housing has a space and an opening. The space accommodates a transportation path section that is at least part of a transportation path for transporting a paper sheet. The opening allows the space to communicate with the outside of the housing. The cover is in any one of positions relative to the opening including a closed position where the cover covers the opening and an open position where the cover uncovers the opening. The movable unit has the transportation path section and is movable between a storage position where the transportation path section is stored in the space and a pulled-out position where the transportation path section is pulled out of the space. The movable unit in the pulled-out position is restrained from moving toward the storage position when the cover is in the open position.