Printing Apparatus Sheet Sensor Cutting Control
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Solution Overview
Problem
Liner-less label sheets pose a challenge as the cut-off portion falls due to its weight and may stick to unintended locations during printing, as existing technologies lack precise control over cutting the sheet at arbitrary locations.
Innovation Solution
A printing apparatus with a control unit that determines the image length and a sheet sensor to detect when the sheet is lifted, triggering the cutter to cut the sheet only when it is lifted, preventing cutting when hanging down, ensuring precise cutting at arbitrary locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cutter continuously cuts the unwound sheet during printing, then the sheet can be cut at arbitrary locations, but the cut-off portion falls down due to its own weight and may be stuck to an unexpected location
Solution Approach 1:
The system applies preliminary anti-action by detecting the sheet's state (hanging down vs. lifted) before triggering the cutting action. The sheet sensor detects whether the cut-off portion is in a harmful state (hanging down) or safe state (lifted), and the control unit prevents cutting when the sheet is hanging down, thereby counteracting the potential harmful effect before it occurs.
Solution Approach 2:
The sheet sensor provides real-time feedback about the sheet's position state to the control unit. This feedback mechanism allows the system to dynamically adjust the cutting operation based on the actual state of the sheet, ensuring that cutting only occurs when the sheet is in a safe state (lifted up), thus preventing the cut-off portion from sticking to unintended locations.
2Object-affected harmful factors
If the cutter waits for the sheet to be lifted before cutting, then the cut-off portion does not stick to unintended locations, but the cutting cannot be performed at arbitrary locations including when the sheet is stationary in the housing
Solution Approach 1:
The sheet sensor provides real-time feedback about the sheet's position state, enabling the system to adaptively determine whether cutting conditions are met. This feedback allows the system to perform cutting at arbitrary locations whenever the sheet is in the lifted state, providing both safety and flexibility.
Solution Approach 2:
The system dynamically adjusts the cutting operation based on the real-time state of the sheet. Rather than using a fixed cutting mechanism, the system continuously monitors the sheet's position and enables cutting only when conditions are appropriate (sheet lifted), allowing flexible cutting at any location during the printing process.
3Manufacturing precision
If a sheet sensor is added to detect the sheet position, then cutting can be controlled based on sheet state, but the device complexity increases
Solution Approach 1:
The system replaces complex mechanical cutting control mechanisms with a simpler sensor-based detection and electronic control system. The sheet sensor uses optical or electromagnetic fields to detect the sheet's position state, and the control unit processes this information electronically to trigger or prevent cutting, thereby reducing mechanical complexity while improving control precision.
Solution Approach 2:
The sheet sensor automatically detects the sheet's position state and provides this information to the control unit without requiring manual intervention. The system serves itself by using the sensor feedback to automatically determine whether cutting conditions are met, reducing the need for complex external control mechanisms.
Data Source
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AI summary
A printing apparatus (10) includes a housing (11), a conveying unit (27, 28, 30, 35, 36) configured to unwind a portion of a rolled sheet (21) and convey the unwound sheet (21), a printing unit (31) configured to print an image on the unwound sheet (21), a cutter (32) configured to cut off a portion of the unwound sheet (21), and a sheet sensor (17) configured to detect a portion of the unwound sheet (21) conveyed out of the housing (11) and, upon detecting the portion, output a detection signal that causes the cutter (32) to cut off the unwound sheet (21).