Recording Head Clock Signal Defect Detection Circuit
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Solution Overview
Problem
Ink jet recording apparatuses face issues with wire breaks in cables connecting the recording head to the main body unit, leading to defects in clock data and potential faults in the recording head due to abnormal drive signals caused by cable bending or deterioration during the reciprocation of the recording head.
Innovation Solution
A recording head equipped with a phase-shifting clock signal generation unit, a logical sum signal generation unit, and a detection unit to identify wire breaks based on the logical sum signal, ensuring the drive signal is disabled when a loss of clock is detected to prevent faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the recording head is moved relative to the main body unit by mounting on a carriage, then recording on the entire surface of the recording medium is enabled, but wire breaks may occur in the cable connecting the recording head to the main body unit due to repeated reciprocation
Solution Approach 1:
The patent applies preliminary action by detecting wire breaks before they cause recording defects. The detection circuit continuously monitors the cable connection status and identifies wire breaks in advance, allowing the system to take preventive measures before the broken cable affects recording quality or causes recording head faults.
Solution Approach 2:
The patent implements feedback through a detection circuit that continuously monitors the cable connection and provides real-time information about wire break status. This feedback mechanism allows the control unit to respond to cable degradation or failure, enabling the system to adjust operations or alert users before critical failures occur.
2Productivity
If the recording head is frequently reciprocated in the main scan direction, then recording speed and recording density are improved, but the cable undergoes repeated bending and deterioration leading to wire breaks
Solution Approach 1:
The detection circuit performs preliminary monitoring of cable integrity before wire breaks lead to recording failures. By continuously checking cable status during high-speed reciprocation operations, the system can identify degradation trends and warn users before the cable fails completely, allowing for preventive maintenance.
Solution Approach 2:
The system establishes a feedback loop where the detection circuit continuously reports cable health status to the control unit. This enables real-time monitoring of cable durability under repeated bending stress, allowing the system to adjust operational parameters or notify users of impending cable failure.
3Reliability
If a wire break occurs in the cable, then signal transmission may be interrupted causing defects in clock data, but the recording head continues to operate potentially causing faults due to abnormal drive signals
Solution Approach 1:
The patent applies preliminary anti-action by detecting wire breaks and taking preventive measures before abnormal drive signals can damage the recording head. The detection circuit identifies cable failures and triggers protective actions that prevent the generation of harmful abnormal signals, thereby protecting the recording head from potential damage.
Solution Approach 2:
The detection circuit provides continuous feedback about cable integrity to the control unit. When a wire break is detected, this feedback enables the system to immediately stop or adjust operations, preventing the generation of abnormal drive signals that would otherwise occur due to interrupted clock signals.
Data Source
AI summary
Provided is a recording head including: a recording element; a delay circuit including a delay element and configured to supply a clock signal from a main body unit of a recording apparatus to the delay element; and a logical sum (OR) element configured to generate a clock state signal based on a logical sum of the clock signal and output from each delay element. The recording head detects a defect in the clock signal transmitted from the main body unit to the recording head based on the clock state signal, and sets the recording element to a disable state when a defect is detected in the clock signal.