Printer Paper Roll Detection Mechanism for Accurate Trailing End Positioning
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Solution Overview
Problem
Printers configured to detect the trailing end of paper from a roll often erroneously detect paper delivery due to slack or dragging issues, leading to incorrect detection of paper position.
Innovation Solution
A printer configuration with a detector positioned on the guide member, where it can accurately detect paper separation from the roll by using a mechanical sensor and flanges to prevent false detection caused by slack or adhesive, ensuring correct detection of paper delivery to the trailing end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the paper is allowed to rotate together with the paper roll due to slack, then the paper can be conveyed, but the delivery position of the paper changes and causes erroneous detection
Solution Approach 1:
The detection function is segmented by dividing the circumference of the paper roll into two distinct areas: a first area where the paper is pulled away from the roll (correct detection zone) and a second area where the paper contacts the roll (false detection zone). The detector is positioned to detect only when the delivery position is in the first area, thereby eliminating false detections caused by paper rotation while maintaining conveyance functionality.
Solution Approach 2:
A guide member is introduced as an intermediary component between the paper roll and the detector. This guide member creates a physical separation that ensures the paper is pulled away from the roll in the first area, allowing the detector to reliably distinguish between actual delivery and paper rotation without direct contact with the rotating paper surface.
2Measurement precision
If the detector is positioned to detect paper on the roll circumference, then delivery can be detected, but foreign matter like chaff or paper dust causes false detection
Solution Approach 1:
The harmful detection zone is extracted and isolated. By positioning the detector to detect only in the first area where the paper is pulled away from the roll, the system excludes the second area where foreign matter like chaff or paper dust would cause false detections. This spatial separation removes the harmful factor from the detection function.
3Measurement precision
If the paper is pulled away from the roll at all positions, then detection is reliable, but the paper cannot be conveyed properly
Solution Approach 1:
The paper handling characteristics are made local rather than uniform. In the first area, the paper is pulled away from the roll to enable reliable detection. In the second area, the paper contacts the roll to enable proper conveyance. This local differentiation allows the system to simultaneously achieve both reliable detection and proper conveyance without compromise.
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
This configuration enables accurate detection of paper delivery to the trailing end, reducing errors from slack, adhesive, or foreign matter, ensuring reliable operation even with label paper.
Implementation Method 1
the detector has a mechanical sensor
Data Source
AI summary
Technology enabling correctly detecting that paper has been delivered from a paper roll to the trailing end A printer has an inkjet head; a roll paper support; a delivery motor configured to rotate the roll paper supported by the roll paper support; a guide member configured to guide roll paper conveyed from the paper roll; and a detection switch disposed to a position where it detects the conveyed roll paper when the delivery point on the circumference of the paper roll moves to the part of the circumference of the roll on the same side of an imaginary line as the guide member; the delivery point being from which the conveyed roil paper separates from the roil when the paper roll turns; and the imaginary line being tangent to the guide member and passing through the center of the roll.