Paper Transfer Device Downstream Pressing Mechanism
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Solution Overview
Problem
In line-type inkjet printers, the trailing end of the paper can uplift from the transfer surface due to weakened suction forces at the downstream side of the air-suction type under-head transfer unit, potentially contacting and damaging the inkjet heads, complicating the device configuration with additional mechanisms for pressing the paper.
Innovation Solution
A paper transfer device with a downstream-side transfer portion and a controller that controls a paper leading portion to press the paper after its leading end is transferred, preventing uplift by minimizing the need for additional pressing mechanisms and ensuring the paper remains on the transfer surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanism for pressing the paper is provided on the downstream side of the under-head transfer unit, then the paper can be prevented from being uplifted, but the configuration of the device becomes complicated
Solution Approach 1:
The paper leading portion, originally designed to guide the paper from the transfer unit to the downstream transfer portion, is made to perform an additional pressing function. The controller controls this existing component to press the paper after the leading end is led, making it multi-functional and avoiding the need for a separate pressing mechanism.
Solution Approach 2:
The paper leading portion serves itself by performing both its original guiding function and the additional pressing function. The controller utilizes the existing structure to accomplish the pressing task, allowing the component to serve multiple purposes without external assistance or additional dedicated mechanisms.
2Device complexity
If the paper is not pressed after being led to the downstream transfer portion, then the device configuration remains simple, but the trailing end of the paper becomes easily uplifted from the transfer surface
Solution Approach 1:
The pressing action is applied dynamically and selectively based on the paper's position and state. The controller activates the pressing function of the paper leading portion at the appropriate moment after the leading end is led to the downstream transfer portion, providing just enough pressing force to prevent uplift without continuously pressing the entire paper throughout the transfer process.
Solution Approach 2:
The pressing action is performed as a preliminary measure to prevent potential uplift before it occurs. By controlling the paper leading portion to press the paper immediately after the leading end is led to the downstream transfer portion, the system proactively prevents the trailing end from uplifting rather than reacting to uplift after it happens.
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 effectively suppresses paper uplift from the transfer surface, preventing damage to inkjet heads and simplifying the device configuration while restricting smudges on printed media by controlling the press-start timing based on paper type and size.
Implementation Method 1
Negative pressure is generated in the chamber by driving the fan, and thereby air is suctioned through the through holes to generate suction forces at the through holes of the transfer belt
Implementation Method 2
a chamber that forms a negative pressure chamber for generating suction forces through the through holes of the transfer belt
Implementation Method 3
a controller that controls the paper leading portion to press the paper after a leading end of the paper is led to the downstream-side transfer portion by the paper leading portion
Data Source
AI summary
A paper transfer device includes a paper transfer unit that transfers a paper laid on a transfer surface beneath an inkjet head, a downstream-side transfer portion that is disposed on a downstream side of the transfer unit along a transfer direction of the paper and transfers the paper along a downstream-side transfer path extending downward from the transfer surface, a paper leading portion that leads the paper from the transfer unit to the downstream-side transfer portion, and a controller that controls the paper leading portion to press the paper after a leading end of the paper is led to the downstream-side transfer portion by the paper leading portion.