Printer Encoder Logic for Substrate Tension Control
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Solution Overview
Problem
Large format printers face issues with damaging expensive media or substrates due to incorrect threading or feeding into the media path, leading to potential jams and substrate damage.
Innovation Solution
The implementation of a printer system that includes a substrate actuator, printhead carriage, and encoder logic to monitor and control the substrate's movement, ensuring proper alignment and tension, thereby preventing jams and substrate damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the substrate is fed into the media path without monitoring, then the printing operation can proceed, but the substrate may be incorrectly threaded or fed leading to jams and substrate damage
Solution Approach 1:
The encoder monitors substrate position and tension before the substrate enters the printing area, detecting potential threading issues or tension problems in advance. This preliminary monitoring allows the system to prevent incorrect feeding before it causes jams or damage to the expensive substrate
Solution Approach 2:
The encoder provides continuous feedback signals to the controller about substrate position and movement. The controller uses this feedback to adjust substrate feeding in real-time, ensuring accurate positioning and proper tension maintenance throughout the printing process, thereby preventing threading errors and substrate damage
2Device complexity
If the substrate tension is not controlled, then the feeding process is simpler, but the substrate may become damaged or jammed
Solution Approach 1:
The encoder continuously monitors substrate movement and provides feedback signals that enable the controller to maintain proper substrate tension throughout the feeding process. This feedback mechanism ensures the substrate remains taut and properly positioned without requiring complex mechanical tensioning devices
Solution Approach 2:
The system replaces complex mechanical tension control mechanisms with an encoder-based monitoring and control system. The encoder detects substrate position and movement, allowing the controller to manage tension through coordinated motor control rather than mechanical tensioning devices, thereby reducing mechanical complexity while preventing substrate damage
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 prevents substrate jams and damage by accurately controlling the substrate's movement and tension, ensuring reliable printing operations on expensive media.
Implementation Method 1
a roller encoder to generate an encoder output signal associated with rotation of the roller
Implementation Method 2
a drive encoder to generate a drive encoder signal associated with rotation of the drive
Implementation Method 3
the roller comprising a substrate engaging surface to rotate the roller in response to frictional coupling with a substrate
Data Source
AI summary
Examples relate to machine readable storage storing machine readable instructions, arranged when implemented, to process a roller encoder signal, associated with rotation of a substrate engaging roller, and a drive encoder signal, associated with a drive for rotating a carrier bearing the substrate, to determine a characteristic associated with the substrate.