Medium Cutter Pinch-Hold Mechanism for Sheet Jamming Prevention

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Solution Overview

Problem

Existing medium cutters face challenges in efficiently cutting sheets without causing jamming or damage, particularly due to the self-weight of the sheets leading to twisting and bending during the cutting process, and require complex mechanisms for holding and rotating blades.

Innovation Solution

A medium cutter with a conveyor system, a cutter that moves orthogonally to the conveyance direction, and a holding mechanism using first and second holders to pinch and hold the sheet from both surfaces, reducing vibration and enhancing cutting ability with round blades and a drive transmitter for efficient rotation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional cutter mechanism is used to cut sheets, then cutting function is provided, but sheet jamming and damage occur due to self-weight causing twisting and bending

Engineering Contradiction:

Improvecutting reliabilityVSAvoidsheet jamming and damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The first holder moves to the one end of medium before cutting to pinch and hold the medium between the first holder and second holder. This preliminary holding action prevents the medium from twisting or bending during the subsequent cutting process, eliminating sheet jamming and damage caused by self-weight.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The holding mechanism applies localized pinching force only at the one end of the medium where cutting occurs. The first holder and second holder contact only the specific region needing support during cutting, providing precise local control to prevent twisting without affecting the entire sheet.

Inventive Principle:

Principle #3Local quality

2Strength

If complex holding and rotation mechanisms are used for the cutter, then cutting ability is enhanced, but device complexity increases

Engineering Contradiction:

Improvecutting abilityVSAvoidholding mechanism complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The holding function is segmented into two independent holders: the first holder that moves to contact the medium, and the second holder that contacts the medium from the opposite side. This segmentation simplifies each individual holder's structure while collectively providing stable holding during cutting, avoiding the need for a single complex holding mechanism.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a complex mechanism to hold and rotate the entire cutter assembly, the invention inverts the approach by using simple stationary holders to hold the medium in place while the cutter blade moves through the medium. This reduces mechanism complexity while maintaining cutting ability.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS11607896B2Medium cutter and liquid discharge apparatus

Publication Date: 2023.03.21 RICOH CO LTD

AI summary

A medium cutter includes a conveyor configured to convey a medium in a conveyance direction, a cutter configured to cut the medium from one end of medium in a cutting direction orthogonal to the conveyance direction, a first holder movable to contact a first surface of the one end of medium, and a second holder configured to contact a second surface of the one end of medium opposite the first surface. The first holder is disposed downstream of the cutter in the conveyance direction, and the first holder moves to the one end of medium to pinch and hold the one end of medium between the first holder and the second holder.