Skew Detection Device Angled Rollers Print Media
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Solution Overview
Problem
During printing operations, skewed print media can cause misalignment of printed images, media jams, and damage to the media, such as wrinkles. Existing technologies rely on skew detection sensors to address this issue but may not accurately detect skew in all scenarios, particularly in dusty environments or with varying types of print media.
Innovation Solution
The implementation of a skew detection device comprising angled contact rollers and sensors that capture rotation parameters to determine if the print media is skewed. This device can be positioned in various configurations along the media path to accurately measure skew angles and calculate calibration values to adjust printing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If skew detection sensors are used to detect media skew, then printing operations can be modified to prevent damage, but measurement precision deteriorates in dusty environments or with varying types of print media
Solution Approach 1:
The skew detection system is divided into multiple independent detection devices positioned at different locations along the media path. Each device measures skew independently, and the controller integrates these measurements to determine overall media skew, improving reliability in varying environmental conditions
Solution Approach 2:
A controller acts as an intermediary that receives signals from multiple skew detection devices, processes the measurements, and determines the final skew value. This intermediary layer integrates data from multiple sources to overcome limitations of individual sensors in dusty environments or with varying media types
2Measurement precision
If multiple skew detection devices are positioned in various configurations along the media path, then measurement precision improves, but device complexity increases
Solution Approach 1:
Multiple skew detection devices use the same basic sensor design and measurement principle, making them universal components that can be positioned in different configurations (V-shape, Lambda-shape, parallel) to suit different application requirements without redesigning the core detection mechanism
Solution Approach 2:
The controller receives feedback signals from multiple detection devices and processes these measurements to determine skew. This feedback mechanism allows the system to integrate information from multiple sources systematically, improving precision while managing complexity through standardized signal processing
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 skew detection device effectively determines skew in print media, preventing misalignment and damage by allowing for real-time adjustments in printing operations. Its accuracy is enhanced by using multiple devices in configurations such as 'V' or 'Λ' shapes, which can account for variations in media type and environmental conditions.
Implementation Method 1
a first contact roller (110a) and a second contact roller (110b) positioned at an angle to one another. The first contact roller (110a) is rotatable around a first axis (115a) and the second contact roller (110b) is rotatable around a second axis (115b)
Data Source
AI summary
According to some examples, a skew detection device comprises a first roller rotatable around a first axis, a second roller rotatable around a second axis, a first sensor, and a second sensor. The first sensor measures a first rotation parameter from the first roller and the second sensor measures a second rotation parameter from the second roller. A movement of a print media over the device rotates the first contact roller and the second roller, and a controller determines a skew of the print media based on the first and second rotation parameters captured by the first sensor and the second sensor.