Roll Medium Transport Shaft Rotation Detection
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Solution Overview
Problem
Existing roll-shaped medium transport devices fail to reliably detect transport faults, leading to inadequate medium transport and image formation issues in image forming apparatuses due to external environment-induced bonding between the shaft and the roll sheet.
Innovation Solution
A roll-shaped medium transport device equipped with a rotation detecting unit, a rotation unit, and a determination unit that assesses the transport state by detecting the rotation of the support shaft, allowing for the detection of abnormalities and normal transport states, including the use of an end detecting unit to determine when the medium is ended.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shaft member and sheet end are bonded by external environment, then the roll sheet cannot be transported normally, but the existing device lacks the capability to detect this bonding state
Solution Approach 1:
The system implements feedback by detecting the rotation state of the support shaft and using this information to determine whether the roll sheet is properly detached. The rotation detection unit monitors shaft rotation, and the determination unit uses this feedback to identify abnormal bonding states, enabling reliable fault detection without complex additional sensors.
Solution Approach 2:
The support shaft's own rotation characteristic serves as the detection indicator. Instead of adding separate detection mechanisms, the system utilizes the shaft's natural rotation behavior during transport - when the sheet is properly detached, the shaft rotates freely; when bonded, rotation is restricted. This self-service approach detects faults using the component's inherent operational characteristics.
2Measurement precision
If the roll sheet is bonded to the shaft member, then image formation is unsatisfactory, but the existing device cannot distinguish bonding from normal transport states
Solution Approach 1:
The invention replaces complex mechanical detection mechanisms with a rotation detection system. Instead of using mechanical sensors to directly detect bonding, the system monitors the rotational motion of the support shaft, which naturally changes when bonding occurs. This substitution simplifies the detection mechanism while improving measurement precision.
Solution Approach 2:
The system detects bonding by monitoring changes in the rotation parameter of the support shaft. When the roll sheet is bonded to the shaft, the rotation speed, rotation smoothness, or rotation amount changes compared to normal transport. By tracking these parameter changes, the system precisely distinguishes bonding states from normal transport states.
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
Enables reliable detection of transport faults and normal transport states, preventing defects by stopping the printing process when an abnormal transport state is detected, ensuring proper medium transport and image formation.
Implementation Method 1
a rotation detecting unit that detects rotation of the support shaft
Data Source
AI summary
A roll-shaped medium transport device includes: a medium supply unit that keeps a roll body formed by winding a roll-shaped medium on a support shaft, and unwinds and supplies the roll-shaped medium; a transport unit that transports the roll-shaped medium unwound from the roll body; a rotation detecting unit that detects rotation of the support shaft; a rotation unit that rotates the support shaft; and a determination unit that determines abnormality of a transport state of the roll-shaped medium on the basis of the rotation detecting unit when the rotation unit rotates the support shaft, when the rotation detecting unit does not detect the rotation of the support shaft in a state where a transport operation of the roll-shaped medium is performed by the transport unit.