Printer Movable Blade Avoiding Mechanism for Jammed Cover Access
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Solution Overview
Problem
The existing paper cutting devices in printers are complicated to maintain due to the need for manual resetting of the movable blade to its initial position when jammed, which prevents the upper cover from being opened, leading to inconvenient maintenance and high costs.
Innovation Solution
A printer design with a movable blade component fixed on the upper cover and a fixed blade on the body, incorporating a movable blade avoiding mechanism featuring an avoiding cover that pivots upward, a positioning member, and an elastic pressing member to automatically open the upper cover when the movable blade is jammed, allowing the printer to be opened without manual resetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fixed blade is fixed on the upper cover and opened with the upper cover, then the structure is simple, but the upper cover cannot be opened when the movable blade is jammed and cannot return to initial position
Solution Approach 1:
The fixed blade is separated from the upper cover and fixed on the body instead. This segmentation allows the upper cover to be opened independently of the fixed blade position, resolving the contradiction between simple structure and ease of opening when jammed.
Solution Approach 2:
An ejector rod is introduced as an intermediary mechanism. When the upper cover is opened, the ejector rod automatically pushes the fixed blade to move away from the movable blade, preventing interference and allowing the cover to open even when jammed.
2Ease of operation
If the movable blade is pushed away manually when jammed, then the upper cover can be opened, but the maintenance becomes complicated
Solution Approach 1:
The ejector rod provides self-service functionality by automatically pushing the fixed blade away when the upper cover is opened. This eliminates the need for manual intervention to reset the movable blade, simplifying maintenance while ensuring the cover can be opened.
Solution Approach 2:
The ejector rod performs the blade positioning action in advance during the cover opening process. By automatically moving the fixed blade away before the cover is fully opened, it prevents interference and simplifies the maintenance operation.
3Ease of operation
If the American invention structure is used with fixed blade on body and ejector mechanism, then the upper cover can be opened when jammed, but the structure becomes very complicated and cost is high
Solution Approach 1:
The complex locking and ejector mechanisms from the American invention are extracted and replaced with a simpler design. The fixed blade is directly fixed on the body without complex locking, and a simple ejector rod is used instead of the multi-component ejector mechanism, reducing structure complexity while maintaining the ability to open the cover when jammed.
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 structure and operation of the printer, enabling easy opening of the upper cover even when the movable blade is jammed, reducing maintenance complexity and costs while ensuring smooth operation.
Implementation Method 1
an elastic pressing member which presses the avoiding cover against the positioning member
Implementation Method 2
an avoiding cover capable of turning upward and pivoted to the body of the printer
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The present invention discloses a printer convenient for maintaining a paper cutting device (500). The printer comprises a paper cutting device and a movable blade avoiding mechanism. The paper cutting device has a movable blade component (510) fixed on the upper cover (100) of the printer and a fixed blade (520) fixed on the body (200) of the printer, the movable blade avoiding mechanism has an avoiding cover (210) capable of turning upward and pivoted to the body of the printer, and a positioning member (240) and an elastic pressing member (230) which keep the avoiding cover in a predetermined position on the top of the fixed blade. The avoiding cover and the upper cover of the printer are respectively arranged at two sides of a printing paper conveying passage, with opposite turning directions, and the movable blade (511) of the movable blade component is located between the avoiding cover and the fixed blade. When paper is jammed during the use of the printer, the avoiding cover of the movable blade avoiding mechanism is turned by the action of the movable blade or turns automatically, so that a problem can be avoided that the upper cover of the printer cannot be opened until the movable blade is reset to the initial position by hands. Furthermore, the structure of the movable blade avoiding mechanism is simple, and thus the overall cost of the printer is reduced.