Dynamic Power-Off Timer for Printing Apparatus Emergency Shutdown
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Solution Overview
Problem
Conventional printing apparatuses cannot immediately shut off the power source during emergencies, leading to potential damage due to the need to standby for a fixed timer period even when the CPU is out of control, which is not in a printing state.
Innovation Solution
A printing apparatus with a power source control unit that sets a count time based on the processing being performed, allowing for immediate power shutdown by using a timer to measure the completion of termination preparation processing or a predetermined count time, ensuring safe power-off even when the CPU is out of control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed timer measurement time longer than printing time is set to guarantee power-off after printing completion, then reliability of power-off after printing is improved, but immediate power shutdown capability during emergencies deteriorates
Solution Approach 1:
The timer measurement time is changed from a fixed value to a dynamic value that adapts based on the current processing state. When printing is being performed, the timer measures a first time period longer than printing time to ensure power-off after completion. When printing is not being performed, the timer measures a second time period that is shorter, enabling immediate power shutdown during emergencies. This dynamic adjustment resolves the contradiction between reliable power-off after printing and immediate power shutdown capability.
Solution Approach 2:
The measurement time parameter of the timer is changed based on the processing state. The system detects whether printing is being performed and adjusts the timer's measurement time accordingly - using a longer time period when printing is active and a shorter time period when printing is inactive. This parameter change allows the system to achieve both reliable power-off after printing completion and immediate power shutdown during emergencies.
2Reliability
If a fixed timer measurement time is used to handle CPU out of control, then power-off guarantee is improved, but time waste in non-printing state deteriorates
Solution Approach 1:
The timer measurement time dynamically adapts to the current processing state. When the CPU is out of control during printing, the timer uses a longer measurement time to ensure power-off guarantee. When the CPU is out of control during non-printing state, the timer uses a shorter measurement time to minimize time waste. This dynamic behavior resolves the contradiction between power-off guarantee and time efficiency.
Solution Approach 2:
The system performs preliminary detection of the processing state before the CPU goes out of control. By detecting whether printing is being performed in advance, the system can pre-set the appropriate timer measurement time, ensuring that the correct time period is used when the emergency occurs, thereby achieving both power-off guarantee and time efficiency.
3Reliability
If timer measurement time is set longer than printing time, then power-off after printing completion is ensured, but immediate emergency response capability deteriorates
Solution Approach 1:
The timer measurement time is dynamically adjusted based on whether printing is being performed. During printing operations, the timer uses a longer measurement time to ensure power-off after completion. During non-printing operations, the timer uses a shorter measurement time to enable immediate emergency response. This dynamic adjustment resolves the contradiction between ensuring power-off after printing and maintaining emergency response capability.
Solution Approach 2:
The system changes the timer measurement time parameter based on the operational state. When printing is detected, the parameter is set to a longer value for reliable power-off. When printing is not detected, the parameter is set to a shorter value for quick emergency response. This parameter change strategy resolves the contradiction between power-off reliability and emergency response ease.
Data Source
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AI summary
The printing apparatus of the present invention is a printing apparatus including: a power source switch (111) that switches a power source to on or off; a control circuit (112) configured to control supply or shutoff of power from the power source; and a measurement unit (113) configured to measure a predetermined set time after the power source switch is switched to off, and the predetermined set time is set in accordance with processing being performed, and the control circuit performs control, in a case where the power source switch is switched to off, so as to shut off supply of power from the power source in accordance with completion of termination preparation of the processing being performed or completion of measurement of the predetermined set time in the measurement unit.