Paper Conveyance Roller Phase Control for Sheet Feed Accuracy

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Solution Overview

Problem

Existing paper sheet conveyance devices in image forming devices suffer from conveyance errors, which affect the performance of these devices.

Innovation Solution

A paper sheet conveyance device with a pair of conveyance rollers controlled by a driver and a hardware processor to adjust rotation speed and position, ensuring consistent rotation phases for sheets of the same size to minimize errors due to outer diameter shape tolerance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conventional paper sheet conveyance device uses a pair of conveyance rollers to convey paper sheets, then the device can perform basic conveyance function, but conveyance errors occur due to outer diameter shape tolerance of the rollers

Engineering Contradiction:

Improveconveyance precisionVSAvoidconveyance error

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The control unit controls the conveyance rollers to rotate at a predetermined rotation phase before the paper sheet is conveyed, ensuring that the rollers are in the optimal position when the paper sheet contacts them. This preliminary positioning action compensates for outer diameter shape tolerance and ensures consistent conveyance precision for paper sheets of the same size.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the rotation phase parameter of the conveyance rollers to a predetermined value before conveyance, and maintains this specific parameter setting during the conveyance process. By controlling the rotation phase parameter, the system eliminates conveyance errors caused by variations in roller outer diameter shape.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the conveyance rollers rotate at variable speeds during conveyance, then the device can adapt to different paper sheet sizes, but conveyance precision deteriorates due to inconsistent rotation phases

Engineering Contradiction:

Improvepaper sheet size adaptabilityVSAvoidconveyance precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The system dynamically adjusts the rotation speed of the conveyance rollers based on the detected paper sheet size, while maintaining the predetermined rotation phase relationship. This dynamic speed adjustment allows adaptation to different paper sizes without compromising conveyance precision, as the rotation phase consistency is preserved throughout the variable speed operation.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250365378A1Paper sheet conveyance device and image forming device comprising the same

Publication Date: 2025.11.27 KONICA MINOLTA INC

AI summary

Disclosed is a paper sheet conveyance device, including: a pair of conveyance rollers that rotates to convey a paper sheet passing through them; and a driver that drives the pair of conveyance rollers to rotate. The paper sheet conveyance device further includes a hardware processor that controls the driver to drive the pair of conveyance rollers to rotate, such that before the paper sheet breaks into the pair of conveyance rollers, a rotation speed of the pair of conveyance rollers reaches a predetermined conveyance speed, and after the paper sheet is separated from the pair of conveyance rollers, the pair of conveyance rollers continue to rotate to a predetermined position to stop.