Paper Feeder with Differential Friction Supports for Impact Reduction
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Solution Overview
Problem
Conventional paper feeders generate impact forces and uneven feeding speeds, leading to image deterioration and printing irregularities due to stationary friction and inertia issues when extracting paper from rolls, especially with rolls without cores and increasing feeding speeds.
Innovation Solution
A paper feeder design with a container section featuring first and second support surfaces with different friction coefficients, allowing the roll to be rotatably supported and paper to be fed with a strengthened first contact force during extraction, reducing the impact force and maintaining smooth paper feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the paper is taken out from the roll using a conventional paper feeder, then the paper can be fed to the recording device, but impact force is generated and applied to the paper at the recording section causing deterioration of the image
Solution Approach 1:
The patent applies preliminary action by having the roll rotate in advance before paper extraction begins. The roll is rotated to a predetermined angle position where the paper extraction force is minimized, and then paper extraction is performed. This preliminary rotation prepares the system to reduce impact force during the actual paper extraction, preventing image deterioration while maintaining feeding capability.
Solution Approach 2:
The patent implements dynamics by making the roll rotatable and adjustable in position. The roll can be rotated to different angles and positions during operation, allowing the system to dynamically adjust the extraction force and timing. This dynamic adjustment enables the system to minimize impact force at the recording section while maintaining continuous paper feeding.
2Productivity
If the motor reiterates start and stop during paper feeding, then the paper can be fed to print, but the feeding speed fluctuates causing unevenness in printing pitch
Solution Approach 1:
The patent applies preliminary action by performing paper extraction at a predetermined angle position where the extraction force is minimized. This preliminary positioning of the roll before extraction begins allows for smoother paper feeding with reduced speed fluctuations, thereby improving printing pitch uniformity while maintaining printing operation capability.
Solution Approach 2:
The patent implements parameter changes by adjusting the roll's angular position and rotation speed during operation. The system changes these parameters to optimize the extraction process, minimizing the impact on feeding speed consistency. This allows the motor to maintain more stable operation and reduce the fluctuation in paper feeding speed, improving printing pitch precision.
3Device complexity
If stationary friction force is not reduced, then the structure remains simple, but the paper slides instantaneously at the printing section causing unevenness in printing pitch
Solution Approach 1:
The patent applies preliminary action by rotating the roll to a predetermined angle position before paper extraction. This preliminary rotation positions the paper extraction point optimally, reducing the extraction force required and preventing instantaneous sliding at the printing section. The structure remains relatively simple while achieving improved printing pitch uniformity through this preliminary positioning action.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution alleviates the impact force at paper extraction, preventing image deterioration and ensuring consistent printing quality, even with rolls of varying diameters and without cores, by managing friction forces and maintaining smooth paper feeding.
Implementation Method 1
a first support surface having a first friction coefficient between the first support surface and the rolled paper, the first surface and the rolled paper producing a first contact force when the rolled paper moves on the first support surface; a second support surface having a second friction coefficient larger than the first friction coefficient between the second support surface and the rolled paper, the second support surface and the rolled paper producing a second contact force when the rolled paper moves on the second support surface
Data Source
AI summary
Disclosed is a printer including a paper feeder for accommodating a rolled paper to be pulled out and recorded thereon. The feeder has a container section to set the roll, in which first and second support walls are arranged to rotatably support the roll. While paper from the roll is taken out, a contact force produced by the roll against the first support wall is kept larger than that in a stationary state, and a contact force produced by the roll against second support wall is kept smaller than that in the stationary state. A friction coefficient between the second support wall and the roll is larger than one between first support wall and the roll, the roll being in slidable contact with the first and second support walls. Therefore, when the recording is started, an impact force to the roll can be alleviated, resulting in reducing unevenness in image in a feeding direction of the paper.