Printer Sheet Discharge Assembly Passive Ejection
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Solution Overview
Problem
Conventional printers with motor-driven discharge systems for cutting and ejecting individual sheets from a continuous feed roll are complex, costly, prone to jamming, and difficult to troubleshoot and repair.
Innovation Solution
A discharge assembly that eliminates motor-driven components by using a gap with protruding members to impart a curved transverse profile to the sheet material, allowing the leading edge of a subsequent sheet to push the previously cut sheet out, reducing mechanical complexity and improving ease of maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If motor-driven discharge systems are used to eject individual sheets from continuous feed roll, then sheet ejection function is achieved, but device complexity increases significantly
Solution Approach 1:
The patent removes the motor-driven discharge system entirely, extracting the complex mechanical components (motors, drive wheels, control mechanisms) from the printer. Instead, it uses a simple passive discharge tray with a curved surface that relies on the natural motion and gravity of the sheets to achieve ejection, thereby eliminating the complexity while maintaining the sheet ejection function.
Solution Approach 2:
The discharge system is designed to be self-operating without requiring external motorized power. The curved surface of the discharge tray and the natural forward motion of sheets through the printing mechanism automatically propel the sheets out of the tray, making the system self-sufficient and eliminating the need for complex motor-driven control systems.
2Ease of operation
If motor-driven discharge systems are used to eject individual sheets, then sheet ejection function is achieved, but reliability decreases due to jamming and mechanical failures
Solution Approach 1:
By removing the motor-driven components entirely, the patent eliminates the primary sources of mechanical failure and jamming. The passive discharge tray with curved surface has no moving parts that could fail, significantly improving reliability while maintaining the sheet ejection function.
Solution Approach 2:
The discharge tray is designed as a simple, inexpensive component with no complex mechanical parts. This simplicity means fewer things can go wrong, and if wear or damage occurs, the entire tray can be easily replaced without replacing complex motor assemblies, thereby improving system reliability.
3Ease of operation
If motor-driven discharge systems are used, then sheet ejection function is achieved, but ease of repair decreases due to difficulty in troubleshooting
Solution Approach 1:
The patent extracts and removes the complex motor-driven components that make troubleshooting difficult. The simple passive discharge tray with curved surface has minimal parts to diagnose, making repair and maintenance straightforward compared to motorized systems with multiple moving components and electrical connections.
Solution Approach 2:
The discharge system requires no external power or complex control mechanisms, eliminating electrical diagnostics and motor assembly issues from the troubleshooting process. Technicians can quickly identify and resolve any issues with the simple mechanical tray structure, significantly improving ease of repair.
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 simplifies the discharge process, reduces mechanical issues, and makes the system easier to troubleshoot and repair, while maintaining efficient sheet ejection without the need for motor-driven components.
Implementation Method 1
contact and deflect the sheet material as the material moves through the gap
Data Source
AI summary
A printer for printing individual sheets from a continuous feed roll includes a housing configured for receipt of a feed roll of sheet material, and a print mechanism disposed within the housing, whereby the sheet material is conveyed within the housing to print mechanism. A sheet separating device is disposed within the housing downstream of the print mechanism to separate the sheet material into individual printed sheets. A discharge assembly is disposed downstream of the sheet separating device and defines a gap through which the sheet material is advanced. At least one protruding member is disposed in the gap at a position so as to contact and deflect the sheet material and to impart a curved transverse profile to a trailing edge of a first individual sheet held in the gap. In this manner, a leading edge of a subsequent sheet bisects the curved trailing edge of the first sheet and pushes the first sheet out of the gap as the second sheet is advanced through the print mechanism.