Card Reader Motor Output Control for Jam Prevention
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Solution Overview
Problem
Conventional card readers with forcibly ejecting mechanisms to prevent card jamming result in increased complexity and cost, while existing solutions do not effectively restrain jamming or ensure reliable ejection without additional mechanisms.
Innovation Solution
A card-shaped medium processing device with a motor output set to a lower value for taking-in operations compared to ejecting operations, allowing only cards that can be ejected to be taken in, and utilizing a rotation detection mechanism to control motor output based on pulse signal intervals for constant speed and maximum ejection capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a forcibly ejecting mechanism is provided in the card reader, then card jamming is prevented, but the device structure becomes complicated and cost increases
Solution Approach 1:
The patent changes the operational parameters of the existing motor by setting different maximum output values for taking-in operations versus ejecting operations. The taking-in maximum value is configured to be smaller than the ejecting maximum value, allowing the same motor to perform both functions without additional ejection mechanisms. This parameter-based differentiation resolves the contradiction by preventing card jamming through controlled taking-in force while avoiding structural complexity.
2Reliability
If a forcibly ejecting mechanism is provided in the card reader, then card ejection reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent makes the motor serve dual functions: taking-in cards during normal operation and forcibly ejecting cards when jamming occurs. By configuring the motor's maximum output parameters differently for these two functions (taking-in maximum value < ejecting maximum value), the same component performs multiple roles, eliminating the need for separate ejection mechanisms and reducing manufacturing cost while maintaining ejection reliability.
3Reliability
If the taking-in maximum motor output is set smaller than the ejecting maximum value, then card jamming is restrained, but the ability to take in deformed cards may be reduced
Solution Approach 1:
The patent applies parameter changes by setting the taking-in maximum motor output value below the ejecting maximum value. This creates a safety threshold: cards that can be successfully ejected (indicating proper card quality) are accepted, while cards that would cause jamming (and thus cannot be properly ejected) are restrained from being taken in. The system adapts to card conditions through this parameter-based filtering mechanism.
Data Source
AI summary
A card-shaped medium processing device may include an insertion port to which a card-shaped medium is inserted, a medium feeder capable of abutting with a card-shaped medium inserted from the insertion port to carry the card-shaped medium, and a motor for driving the medium feeder. A taking-in maximum value which is the maximum value of an output of the motor at the time of a taking-in operation of a card-shaped medium inserted from the insertion port is set to be smaller than an ejecting maximum value which is the maximum value of an output of the motor at the time of an ejecting operation of the card-shaped medium toward the insertion port. A control method for a card-shaped medium processing device may include the same relationship, i.e., the taking-in maximum value is set to be smaller than the ejecting maximum value.