Conveying Device Phase Matching Control for Print Medium Skew
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Solution Overview
Problem
Conventional inkjet printers face challenges in achieving high image quality and throughput due to significant conveying errors between the main and sub conveying rollers, which are exacerbated by the need for multiple motors and complex drive switching devices to control the phases and positions of these rollers.
Innovation Solution
A conveying device and method that includes a first conveying device, a second conveying device downstream, a detecting device for print medium position, a correcting device for skewing, and a phase detecting device to perform phase matching control, allowing the print medium to reach a desired position with the second conveying device at a desired phase, while correcting skewing using the same control mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate motors and drive switching devices are used to control the phase of conveying rollers and position of print medium, then phase matching control can be achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines the drive functions of the main conveying roller and sub conveying roller into a single motor system. The motor simultaneously drives both rollers through a unified transmission mechanism, eliminating the need for separate motors and drive switching devices while maintaining precise phase matching control between the rollers and print medium position.
Solution Approach 2:
The single motor system performs multiple functions: it drives both the main conveying roller and sub conveying roller, controls their phases relative to each other, and maintains synchronization with the print medium position. This multi-functional approach replaces the need for multiple specialized motors and switching devices.
2Measurement precision
If drive switching device is used to switch driving of motor, then phase control can be achieved, but throughput is reduced due to operation of drive switching device
Solution Approach 1:
The unified motor system enables continuous driving of both conveying rollers without interruption for switching operations. The motor maintains continuous rotation while the transmission mechanism continuously adjusts the phase relationship between rollers and print medium, eliminating downtime associated with drive switching operations and maintaining high throughput.
3Measurement precision
If multiple motors are provided to control conveying rollers individually, then phase matching can be achieved, but cost increases
Solution Approach 1:
The patent merges the functions of multiple motors into a single motor system. One motor drives both the main conveying roller and sub conveying roller through a unified transmission mechanism, reducing the number of motors from two to one while maintaining the ability to control the phase relationship between rollers and print medium position.
4Ease of manufacture
If rubber roller with lower accuracy is used as sub conveying roller, then cost is reduced, but conveying error increases
Solution Approach 1:
The patent changes the operational parameters of the sub conveying roller by implementing phase matching control that synchronizes its rotation phase with the main conveying roller and print medium position. This parameter control approach compensates for the lower manufacturing precision of the rubber roller, maintaining conveying accuracy without requiring high-precision roller fabrication.
Data Source
AI summary
A conveying device and a conveying control method that can control a phase of a main conveying roller and a position of a print medium with an inexpensive configuration and a fast throughput are provided. For that purpose, an LF roller phase is obtained, phase matching control is performed so that the print medium comes to a desired position when the LF roller is at a desired phase, and skewing of the print medium is corrected by the same control method as the phase matching control.