Printing Device Rotary Body Positioning with Dual Detectors
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Solution Overview
Problem
Conventional printing devices face durability issues in their gear mechanisms due to improper resetting of the cutting mechanism, which can occur when detection sensors malfunction, leading to excessive motor operation beyond the cutting mechanism's limits.
Innovation Solution
A printing device with a rotary body, movable blades, a gear mechanism, and dual detection sensors, where a controller positions the rotary body to a reference rotated position based on detection signals from both sensors, ensuring safe operation and preventing gear mechanism damage by halting rotation when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequence control is performed using detection values from two detection sensors to reset the cutting mechanism, then the rotated position of the cam plate can be determined, but if the detection sensors malfunction, the motor could be driven beyond the advancing or retracting limits of the cutting mechanism, adversely affecting the durability of the gear mechanism
Solution Approach 1:
The controller continuously monitors detection signals from both detectors during the positioning process. When a detector malfunctions (outputs abnormal signal), the controller detects this through feedback and immediately adjusts the positioning control to prevent over-rotation, thereby protecting the gear mechanism while maintaining operational capability.
Solution Approach 2:
The controller performs preliminary checks on detection signals before executing the positioning sequence. By validating sensor outputs in advance and preparing alternative control paths, the system prevents damage from sensor failures without requiring complex real-time intervention during critical positioning operations.
2Measurement precision
If the motor is driven to rotate the rotary body for positioning based on detection signals, then the rotary body can be positioned to the reference rotated position, but if detection sensors malfunction, excessive motor operation occurs causing wear and tear on the gear mechanism
Solution Approach 1:
The controller uses feedback from both detectors to monitor the rotary body's position during motor-driven positioning. When a detector malfunctions, the feedback mechanism detects the abnormal signal and triggers alternative control logic that limits motor operation duration and range, preventing excessive wear on the gear mechanism while maintaining adequate positioning precision through the remaining functional detector.
Data Source
AI summary
A printing device includes: a motor; a rotary body driven by the motor to rotate; a movable blade driven by rotation of the rotary body to cut a printing tape; a gear mechanism provided on a power transmission path from the motor to the movable blade; a first detector outputting a first signal based on a rotated position of the rotary body; a second detector outputting a second signal based on the rotated position, and a controller performing positioning the rotary body to a predetermined reference rotated position. The positioning includes: starting rotating the rotary body in one direction on the basis of the first signal at the time of starting the positioning; halting the rotation in the one direction of the rotary body on the basis of the second signal; and rotating the rotary body in the opposite direction for a prescribed time period after the halting is completed.