Pull-in apparatus, image forming apparatus, sheet accommodating apparatus, and draw-out unit
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Solution Overview
Problem
Existing pull-in apparatuses for image forming devices, such as printers, face issues with erroneous release of locking mechanisms, leading to unintended pivoting and increased user operation complexity and costs due to recovery requirements.
Innovation Solution
A pull-in apparatus with an arm member and a restriction member that moves between lock and lock-release positions, where the restriction member's movement is restricted until the arm member has pivoted, preventing accidental unlocking and simplifying the insertion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the locking claw is engaged with a fixed member to lock the lever member in an unpivotable state, then the lever member is securely locked, but the locking can be unintentionally released by erroneous touching
Solution Approach 1:
The patent applies preliminary action by requiring the arm member to be moved to a specific position (where the first action portion contacts the second engagement portion) before the locking claw can be disengaged. This preliminary positioning action ensures that the locking state cannot be changed unless the arm is in the correct position, preventing erroneous unlocking while maintaining secure locking when needed
2Ease of operation
If the locking mechanism allows easy release by touching the locking claw, then the operation is simple, but the locking is released unintentionally causing erroneous activation
Solution Approach 1:
The mechanism requires preliminary action by positioning the arm member to a specific state where the first action portion contacts the second engagement portion before the locking claw can disengage. This ensures intentional operation is required while maintaining ease of release when the preliminary condition is met
Solution Approach 2:
The patent applies dynamics by making the locking mechanism's responsiveness conditional on the arm member's position. The locking claw transitions from a static locked state to a releasable state only when the arm member is in the correct position, creating a dynamic system that adapts its operability based on system state
3Adaptability or versatility
If a recovery structure is provided to restore the lever member after erroneous pivoting, then the system can recover from errors, but the device complexity and cost increase
Solution Approach 1:
The patent applies self-service by designing a mechanism where the normal insertion operation automatically restores the system to its proper state. When the unit is inserted, the arm member is pushed to the position where the locking claw disengages and then re-engages correctly, self-correcting any erroneous state without requiring separate recovery mechanisms or user intervention
Data Source
AI summary
A pull-in apparatus configured to pull in a unit toward a predetermined position in an apparatus body includes an arm member, a restriction member, a first action portion and a second action portion. The restriction member is movable between a lock position at which the restriction member restricts movement of the arm member in a first direction and a lock-release position at which the restriction member allows the movement of the arm member in the first direction. Movement of the restriction member from the lock position toward the lock-release position is restricted in a state in which the arm member is at a stand-by position, and is allowed in a state in which the arm member has been moved from the stand-by position in a second direction.