Skew Correction in Loop Transport Belt Apparatus
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Solution Overview
Problem
Medium processing apparatuses face challenges in maintaining alignment during transport and stacking due to skew issues caused by biased image regions on the medium, leading to reduced alignment quality on the stacker.
Innovation Solution
A medium transporting apparatus with a loop-shaped transport belt, detection units, and a correction unit that adjusts the skew of the medium by rotating the transport belt and moving guide units, ensuring proper alignment and reducing damage risks through suction or electrostatic clinging mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the medium is transported in an oblique direction to come into contact with the side guide for skew correction, then the skew of the medium can be corrected, but when the medium moves greatly obliquely, the wrong end of the medium approaches the side guide and skew correction fails
Solution Approach 1:
The detection units are divided into multiple segments arranged at different positions (upstream side and width direction) to independently detect different aspects of medium orientation, enabling accurate detection even when medium moves greatly obliquely
Solution Approach 2:
The side guide acts as an intermediary element that the medium contacts after detection, providing a reference surface for skew correction while the detection units provide intermediate measurement data about medium orientation
2Measurement precision
If multiple detection units are arranged at different positions in the width direction to detect medium transport direction end, then the direction and size of oblique movement can be detected, but the device complexity increases
Solution Approach 1:
The multiple detection units serve multiple functions: detecting transport direction end, determining oblique movement direction, and calculating oblique movement size, eliminating the need for separate detection systems for each parameter
3Manufacturing precision
If the correction unit corrects skew of the medium in a state of cling to the transport belt, then the alignment of stacked medium can be maintained even when recorded region is biased, but the clinging mechanism requires additional complexity
Solution Approach 1:
The clinging mechanism uses pneumatic suction through the transport belt to hold the medium in place during skew correction, providing reliable attachment without complex mechanical clamping structures
Solution Approach 2:
The clinging force is adjusted by changing suction parameters to adapt to different medium types and conditions, maintaining effective attachment while simplifying the overall mechanism design
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 solution effectively corrects skew issues and maintains medium alignment during transport and stacking, reducing friction-related deviations and potential damage, while improving the stacking process even with media having high frictional resistance.
Implementation Method 1
a clinging mechanism that causes a medium to cling to the transport belt
Implementation Method 2
suction or electrostatic clinging mechanisms
Data Source
AI summary
A medium transporting apparatus includes a transport belt that has a loop shaped, a cling mechanism that causes the medium to cling to the transport belt, a rotation mechanism that transports the medium by rotating the transport belt, a plurality of detection units that detect an transport direction end of the medium, a controller that corrects a skew of the medium, and a stacker on which the medium transported by the transport belt is stacked, in which the plurality of detection units are arranged at positions that are on an upstream side of the transport belt in the first transport direction and that are different from each other in a width direction, and the controller corrects, according to a result of the detection by the detection units, the skew of the medium in a state of being cling to the transport belt.