Laser Printer Reset Control Logic for Sleep Mode
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Solution Overview
Problem
Laser printers often involuntarily exit sleep mode and perform a reset process, including a warm-up operation, when an input prime signal is received from a connected personal computer, regardless of user intent, leading to unnecessary power consumption and processes.
Innovation Solution
An image-forming device with a reset process control unit that selectively executes a reset process based on user-defined modes, ignoring input prime signals during sleep mode to prevent unwanted reset processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the laser printer receives an input prime signal from the personal computer, then the reset process is executed to clear print data and perform warm-up operation, but the sleep mode is canceled involuntarily leading to unnecessary power consumption
Solution Approach 1:
The patent applies dynamics by making the reset process execution dynamic based on the operational state of the laser printer. The control unit determines whether to execute the reset process by checking if the printer is in sleep mode or ready state, thereby adapting the system behavior to current conditions rather than following a fixed response to input prime signals
Solution Approach 2:
The patent changes the parameter of reset process execution from a fixed response to variable response based on operational state. By introducing state-dependent control logic, the system transitions from always executing reset upon receiving input prime signal to selectively executing reset only when not in sleep mode, thus changing the execution parameter based on current state
2Reliability
If the laser printer executes reset process upon receipt of input prime signal, then print data is cleared and warm-up operation is performed, but user intent is ignored causing unwanted processes
Solution Approach 1:
The patent implements feedback by having the control unit continuously monitor the operational state of the laser printer and use this feedback to determine whether to execute the reset process. The control logic receives feedback about current state (sleep mode or ready state) and adjusts its behavior accordingly, ensuring that reset processes align with user expectations and current operational context
Data Source
AI summary
When an auto-select program is executed in a reset process control program of a laser printer, an input prime signal valid mode is selected when the laser printer is not in sleep mode. Accordingly, the laser printer executes a reset process upon in response to an input prime signal. However, an input prime signal invalid mode is selected when the laser printer is in sleep mode. As a result, the laser printer ignores input prime signals. In this way, a user can prevent undesirable execution of the reset process, thereby reducing the number of unnecessary processes and lowering the running cost.