Movable Sheet Processing Device for Jam Clearance Access

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Solution Overview

Problem

In image forming apparatuses, such as printers and copiers, removing sheet jams near the connecting portions between discharging and movable stacking units is challenging due to limited access and the need to move independent units away from discharging portions, complicating the jam clearance operation.

Innovation Solution

The apparatus includes a movable sheet processing device and a guide unit that can be rotated to open the feeding passage, allowing easier access to jams by sliding the sheet processing device from its operational position to a jam clearance position, thereby improving operativity during sheet removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the sheet processing device is positioned close to the feeding portion for efficient sheet feeding, then sheet feeding efficiency is improved, but access to the connecting portion for jam clearance becomes difficult

Engineering Contradiction:
Improvesheet feeding efficiencyVSAvoidjam clearance accessibility
Core Design Contradiction:
ProductivityVSEase of operation

Solution Approach 1:

The sheet processing device is designed to be movable between a first position (close to the feeding portion for efficient sheet feeding) and a second position (away from the feeding portion for easy jam clearance access). This dynamic positioning allows the system to switch between operational modes based on the current task requirement.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The guide unit is configured to rotate about an axis, providing an additional degree of freedom for accessing the connecting portion. By rotating the guide unit, the feeding passage can be opened from a different dimensional approach, allowing jam clearance without moving the sheet processing device away from its operational position.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Stability of the object's composition

If the guide unit is fixed in position for structural stability, then structural stability is improved, but the feeding passage cannot be opened for jam clearance

Engineering Contradiction:
Improvestructural stabilityVSAvoidfeeding passage accessibility
Core Design Contradiction:
Stability of the object's compositionVSEase of operation

Solution Approach 1:

The guide unit is designed with rotational movement capability about a specific axis. This dynamic feature allows the guide unit to rotate and open the feeding passage for jam clearance while maintaining structural stability when in the closed position for normal operation.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The guide unit is segmented into movable and fixed portions, allowing the rotating guide unit to provide access functionality while the fixed portions maintain structural stability. The rotational axis serves as a hinge between the stable fixed structure and the movable access-providing component.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS11254536B2Image forming apparatus
Publication Date: 2022.02.22 CANON KK
  • US11254536B2 patent drawing
  • US11254536B2 patent drawing
  • US11254536B2 patent drawing

AI summary

An image forming apparatus includes an image forming portion, a swingable member feeding portion, a sheet stacking portion including a stacking tray and a sheet feeding passage and movable between a first position where a sheet feed from the feeding portion is feedable to the sheet feeding passage and a second position away from the first position, and a movable member movable to a space, between the feeding portion and the stacking portion, generating with movement of the stacking portion from the first position to the second position in interrelation with the movement of the stacking portion from the first position to the second position.