Curved Door Limiting Device for Roll Printers
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Solution Overview
Problem
Existing ticket printing apparatuses are prone to damage and jamming due to premature paper removal by users, leading to incorrect printing and excessive paper wastage, especially in public settings, and current solutions involve complex and costly mechanisms with electric motors and sensors.
Innovation Solution
A simple and cost-effective limiting device featuring a curved door with springs and a switch or sensor that activates a cutting mechanism only when a ticket is fully printed, stopping the printing process if interference occurs at the exit, thus preventing jamming and ensuring accurate ticket dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric motors, electronic clutches and sensors are used to control paper advancement and detect interference, then the reliability of preventing premature paper removal is improved, but the device complexity and industrial costs increase
Solution Approach 1:
The patent extracts and eliminates the complex electric motor, electronic clutch and sensor system from the paper ejection device. Instead, it uses a simple mechanical limiting device with a curved door, springs and a basic switch that detects paper presence and controls the cutting mechanism without requiring motors or electronic control systems.
Solution Approach 2:
The patent replaces expensive, complex electronic components with inexpensive mechanical elements. The curved door with springs and a simple switch creates a low-cost solution that achieves the same functional goal of preventing premature paper removal without the high industrial costs associated with motors and electronic clutches.
2Manufacturing precision
If electric motors and electronic control systems are implemented to manage paper ejection timing, then the precision of paper dispensing control is improved, but the possibility of component breakdown increases
Solution Approach 1:
The patent applies mechanics substitution in reverse - it replaces electronic control systems with a purely mechanical solution. The curved door mechanically responds to paper presence, springs provide the necessary force, and a simple switch controls the cutting mechanism, eliminating motors and electronic clutches that are prone to breakdown while maintaining precise control over paper dispensing timing.
3Measurement precision
If a complex sensor and retroaction system is used to detect paper removal interference, then the accuracy of detecting premature removal is improved, but the industrial costs and device complexity increase
Solution Approach 1:
The curved door system is self-actuating - it automatically responds to paper presence and removal without requiring external sensors or electronic detection systems. The mechanical system uses the paper itself to trigger the door movement, which then activates the switch to control the cutting mechanism, achieving accurate detection of premature removal with minimal components.
4Ease of operation
If multiple rolls connected to electric motors are used for paper advancement, then the control over paper movement is improved, but the quantity of components and industrial costs increase
Solution Approach 1:
The patent extracts and removes the multiple rolls connected to electric motors from the system. The limiting device operates independently of the paper advancement mechanism, using only a curved door, springs and a switch to control the cutting operation based on paper presence detection, significantly reducing the quantity of components required.
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 prevents premature paper removal and jamming, ensuring accurate printing and reducing paper wastage by using a low-cost, motor-free mechanism that relies on a pivoting door and tension-sensitive activation to control the cutting of tickets.
Implementation Method 1
The spring is preferably positioned closer to the edge of the door connected to the pins or axle about which the door rotates freely
Data Source
AI summary
A limiting device to prevent unwanted removal of paper from a paper or ticket printing and dispensing apparatus for paper roll printers, including paper cutter actuating means, positioned between a ticket dispensing exit and a cutting device to cut paper onto which printing has taken place and for controlling feeding of the paper and for controlling operation of the printer; activation of the cutting device is responsive to either an incompletely printed ticket or an action externally of said apparatus or to completion of any printing onto the ticket; a movable member or curved door is provided to more from a deactivation position to an activation position to control the operation of the paper cutter and the curved door is responsive to completion of a ticket printing operation or an occlusion at the dispensing exit or to a pre-set printing operation.