Inkjet Printer Conveyance Speed Control for Noise and Efficiency
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Solution Overview
Problem
Ink jet printers face a trade-off between conveyance speed and noise levels, where increasing speed to improve processing capacity results in noise and decreasing speed to reduce noise decreases printing efficiency.
Innovation Solution
A printing device with a control unit that adjusts the rotation speed of the conveyance unit based on the accumulated sheet count from print job data, switching between slower and faster speeds to balance noise and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conveyance speed is increased to improve processing capacity, then productivity is improved, but noise increases
Solution Approach 1:
The patent applies dynamics by making the conveyance speed adjustable rather than fixed. The control unit dynamically changes the rotation speed of the conveyance unit based on the accumulated sheet count, switching between a first speed (lower) and a second speed (higher). This dynamic adjustment allows the system to optimize between noise reduction and productivity based on current printing conditions.
Solution Approach 2:
The patent changes the parameter of conveyance speed based on the accumulated sheet count. When the accumulated sheet count reaches a predetermined threshold, the control unit switches the rotation speed from the first speed to the second speed. This parameter change enables the system to reduce noise during initial printing and improve productivity when printing volume increases.
2Object-generated harmful factors
If the conveyance speed is reduced to decrease noise, then noise is reduced, but printing efficiency decreases
Solution Approach 1:
The system uses dynamic speed adjustment where the conveyance unit rotates at a first (slower) speed when the accumulated sheet count is below the threshold to reduce noise, and switches to a second (faster) speed when the threshold is reached to improve printing efficiency. This dynamic behavior resolves the contradiction by adapting speed to printing volume.
Solution Approach 2:
The control unit changes the rotation speed parameter based on the accumulated sheet count condition. By switching between two distinct speed parameters (first speed for noise reduction, second speed for efficiency), the system resolves the contradiction between noise control and printing efficiency.
Data Source
AI summary
To reduce noise during paper conveyance while ensuring printing efficiency of an inkjet printer, a printing device is equipped with a control unit for moving a recording head back and forth in the scan direction according to the rotation of a carriage motor, a conveyance unit for extracting and feeding paper, conveying the paper in the sub scan direction to match the movement of the recording head to print the fed paper, and ejecting the printed paper according to the rotation of a conveyance motor, a paper reversal unit for coordinating with the rotation of the rotation means of the conveyance motor to reverse the front and back of the paper, and a printing control unit for controlling spraying of the ink from the recording head, as well as controlling the carriage motor and the conveyance motor.