Printer DC Motor Braking Control for Consistent Rear Margins
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Solution Overview
Problem
Printers using DC motors for feeding print-receiving media face variations in rear margins due to ambient temperature changes, leading to inconsistent printing results as the motor's inertial braking is affected by temperature-related changes in load, resulting in either elongated or shortened rear margins.
Innovation Solution
A printer system that includes a temperature detecting device and a braking control part to adjust the braking mode of the motor by short-circuiting its electrodes, allowing for variable control of the braking operation based on ambient temperature, ensuring a consistent rear margin length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If short-circuit braking is applied to the DC motor to stop inertial rotation, then the rear margin can be controlled to a specified length, but ambient temperature variations cause the rear margin to become inconsistent (elongated at high temperature, shortened at low temperature)
Solution Approach 1:
The braking control part dynamically adjusts the braking strategy based on ambient temperature detected by the temperature detecting device. At high temperatures, the system applies braking earlier or with different parameters to compensate for reduced load resistance, while at low temperatures, it adjusts accordingly to prevent over-braking. This dynamic adaptation ensures consistent rear margin across varying temperature conditions.
Solution Approach 2:
The system changes the braking parameters (such as braking timing, duration, or intensity) based on temperature conditions. The braking control part modifies operational parameters of the short-circuit braking mechanism in response to temperature detections, allowing the same hardware to achieve consistent results across different thermal environments.
2Manufacturing precision
If the DC motor is deenergized to brake the print-receiving medium, then the motor position can be fixed, but the inertial rotation causes the print-receiving medium to be fed an inconsistent distance
Solution Approach 1:
The system applies preliminary braking action by short-circuiting the motor electrodes before the inertial rotation completes. The braking control part activates the short-circuit braking mechanism in advance to counteract the expected inertial overshoot, ensuring the print-receiving medium stops at the precise desired position without excessive feeding.
3Device complexity
If constant braking is applied regardless of temperature, then the braking mechanism remains simple, but the transport cannot be stopped at the expected timing when temperature varies
Solution Approach 1:
The temperature detecting device provides feedback about ambient temperature conditions to the braking control part. Based on this feedback, the braking control part automatically adjusts the braking strategy, creating a closed-loop control system that maintains precise stopping position across varying temperatures without requiring complex manual intervention.
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 system effectively maintains a consistent rear margin length regardless of ambient temperature, improving printing accuracy by dynamically adjusting the braking length and timing in response to temperature variations.
Implementation Method 1
The DC motor is configured to generate a driving force for feed by the feeder
Implementation Method 2
The short-circuiting device is configured to short-circuit a positive electrode and a negative electrode of the DC motor and brake when deenergized
Implementation Method 3
The temperature detecting device is configured to detect a temperature of ambient surroundings
Data Source
AI summary
The disclosure discloses a printer including a printing head, a DC motor, an energization control part, a short-circuiting device, a temperature detecting device, and a braking control part. The DC motor is configured to generate a driving force for feed by a feeder. The energization control part is configured to control energization by an energizing device. The short-circuiting device is configured to short-circuit a positive electrode and an negative electrode of the DC motor and brake when deenergized under control of the energization control part. The temperature detecting device is configured to detect a temperature of ambient surroundings. The braking control part is configured to control the short-circuiting device in accordance with the temperature detected by the temperature detecting device, to thereby variably control an operation mode of the braking by the short circuiting.