Spring-Assisted Print Media Feeder with Enclosed Energy Storage
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Solution Overview
Problem
Existing print media feeder apparatuses for image-forming devices are either expensive due to electrical motor-driven systems or pose safety risks with accidental release of stored energy from spring-loaded designs, and they often require a dedicated power supply.
Innovation Solution
A spring-assisted print media feeder apparatus with a housing containing a securely encased spring, connected via a cable and pulley system to an elevator tray, utilizing potential energy for vertical movement and a low-power motor for precise positioning without a dedicated power supply, ensuring operator safety and ease of assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrical motor is used to drive the elevator tray, then the elevator tray can be moved accurately and reliably, but the system becomes expensive and requires a dedicated power supply
Solution Approach 1:
The patent replaces the electrical motor-driven system with a spring-loaded mechanical system. The spring is connected to the elevator tray through a cable and pulley arrangement, using mechanical energy storage and release to drive the tray's vertical movement, thereby eliminating the need for a dedicated power supply while maintaining reliable operation
Solution Approach 2:
The spring-loaded system is designed to automatically adjust the elevator tray position based on the weight of the print media loaded. The spring expands or contracts in response to the load, causing the cable to wind or unwind from the pulley, which automatically moves the tray to the correct position without requiring external power or control systems
2Use of energy by moving object
If springs are attached to the bottom of the elevator tray to support its weight, then electricity consumption is minimized, but the housing size increases and users may be injured by accidental spring energy release
Solution Approach 1:
The patent extracts the spring from direct attachment to the elevator tray and relocates it to a housing structure. The spring is connected to the tray indirectly through a cable and pulley system, separating the energy storage mechanism from the moving tray. This extraction eliminates the safety hazard of direct spring attachment while preserving the energy-saving benefit
Solution Approach 2:
The spring is enclosed within a housing that contains it securely. The housing acts as a protective container, nesting the spring inside a confined space where it cannot directly contact users. The cable and pulley system transmits the spring's mechanical energy to the elevator tray without requiring the spring to be externally accessible
3Ease of operation
If a spring-loaded cylinder arrangement is used to maintain frame position, then the frame position can be adjusted, but the design is unsuitable for accurate adjustment and has many components making assembly difficult
Solution Approach 1:
The patent divides the position adjustment function into two independent parts: the spring-loaded mechanism provides coarse adjustment by responding to the weight of the print media, while a separate low-power electric motor provides fine adjustment for precise positioning. This segmentation allows each component to specialize in its strength, achieving both ease of operation and manufacturing precision
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 provides a safe, cost-effective, and efficient means to feed print media to image-forming devices, eliminating the need for a dedicated power supply while ensuring accurate positioning and protecting operators from accidental energy release.
Implementation Method 1
The weight of the print media is stored in the spring as potential energy. When the print media is fed, the potential energy stored in the spring is released thereby causing a vertical movement of the elevator tray.
Data Source
AI summary
A print media feeder apparatus suitable for use in an image-forming device is provided. The apparatus comprises an elevator tray holding a stack of print media connected to a housing by a transmission system. The housing comprises a hoist drum that is connected to one end of a shaft for connecting the housing to the transmission system. A spring enclosure encasing a spring is fixed on the other end of the shaft. The load of print media is transmitted to the hoist drum, from which it is further transmitted to the spring through the shaft. This results in the displacement of the spring and a corresponding vertical movement of the elevator tray to position the print media at the desired feeding level.