Printer Take-Up Torque Control via Stage Switching
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Solution Overview
Problem
Existing printers wastefully generate excessive torque during the initial stages of take-up in the take-up portion due to the small outer diameter of the roll, leading to inefficient torque control and potential damage to components.
Innovation Solution
A printer with a take-up amount detecting portion and switching control portion that adjusts the driving torque command value in stages as the take-up amount increases, ensuring the torque generated corresponds to the roll's outer diameter, thereby preventing wasteful torque generation and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a command value corresponding to the maximum outer diameter is input to the constant torque control portion, then smooth take-up can be reliably performed at the maximum outer diameter, but excessive torque is wastefully generated during the initial period when the roll outer diameter is small
Solution Approach 1:
The command value for constant torque control is changed from a fixed maximum value to a dynamic value that adapts to the current roll outer diameter. The switching control portion receives outer diameter information and selects appropriate command values from multiple stages, enabling the torque control to match the actual take-up requirements at different take-up amounts.
Solution Approach 2:
The command value parameter is divided into multiple stages corresponding to different roll outer diameter ranges. As the take-up amount increases and the roll outer diameter grows, the command value transitions between stages to provide appropriate torque levels, avoiding the waste of using maximum torque when the roll is small.
2Device complexity
If constant torque control is performed with a fixed command value, then the control system is simple, but it cannot efficiently adapt to the changing torque requirements as the roll outer diameter increases
Solution Approach 1:
The command value range is segmented into multiple discrete stages, each corresponding to a specific roll outer diameter range. This segmentation allows the control system to switch between predefined torque levels based on the current take-up amount, achieving adaptive control without requiring complex real-time calculation and adjustment mechanisms.
Data Source
AI summary
A printer includes a printing head, a take-up driving device, a take-up amount detecting portion, a constant torque control device, and a switching control portion. The take-up driving device drives a take-up portion for taking up at least a part of layers of the recording medium fed by a feeder on an outer circumference part and forming a roll. The take-up amount detecting portion detects a take-up amount by the take-up portion. The constant torque control device performs constant torque control that sets a driving torque of the take-up driving device to a constant value corresponding to an input command value. The switching control portion switches the command value in stages in accordance with an increase in the take-up amount detected by the take-up amount detecting portion associated with an advancement of the take-up by the take-up portion.