Sheet Stacking Layout for Compact Print Sorting

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Solution Overview

Problem

Existing printing apparatuses face an increase in size due to configurations that sort printing media by moving stacking units obliquely, as seen in Document 1, which is a relatively large image forming apparatus.

Innovation Solution

A printing apparatus design that includes a conveyance unit, a printing unit, a maintenance unit, and a stacking unit configured to stack printed media at different positions in intersecting directions, with the maintenance unit positioned over part of the stacking unit, allowing for compact size without increasing the apparatus dimensions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the stacking unit is moved obliquely relative to the conveyance direction to sort printing media, then the sorting function is achieved, but the apparatus size increases

Engineering Contradiction:

Improvesorting functionVSAvoidapparatus size

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent applies dimensionality change by moving the stacking unit in the conveyance direction (first direction) rather than obliquely, and uses the discharge position (second direction intersecting the first direction) to achieve sorting. This transforms a 2D oblique movement problem into a combination of 1D linear movement plus positional variation, reducing the required apparatus footprint while maintaining sorting capability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent employs dynamic adjustment of the discharge position of the printing medium from the conveyance unit. By making the discharge position variable in the second direction (intersecting the conveyance direction), the system achieves sorting functionality without requiring the stacking unit to move obliquely, thus reducing apparatus size while maintaining versatility.

Inventive Principle:

Principle #15Dynamics

2Area of stationary object

If the maintenance unit is placed over part of the stacking unit in the height direction, then space utilization is optimized, but access to the stacking unit may be restricted

Engineering Contradiction:

Improvespace utilizationVSAvoidaccess to stacking unit

Core Design Contradiction:

Area of stationary objectVSEase of operation

Solution Approach 1:

The maintenance unit is configured to be movable relative to the stacking unit, allowing it to move between a maintenance position (over the stacking unit) and a retracted position. This dynamic capability enables the maintenance unit to optimize space utilization during maintenance operations while allowing full access to the stacking unit when maintenance is not required, resolving the contradiction between space efficiency and operational accessibility.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260034788A1Printing apparatus

Publication Date: 2026.02.05 CANON KK

AI summary

A printing apparatus includes a conveying unit configured to convey a printing medium in a first direction; a printing unit configured to print the printing medium conveyed by the conveying unit, a maintenance unit configured to maintain the printing unit, and a first stacking unit configured such that the printing medium printed by the printing unit is stacked thereon at a first position and a second position which is different from the first position in a second direction intersecting the first direction, wherein the maintenance unit is on one side of the first stacking unit in the second direction.