Registration Roller Skew Correction Using Electromagnetic Clutch
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Solution Overview
Problem
Existing skew correction devices face inefficiencies due to backlash in the power transmission path between the driving unit and the registration roller pair, leading to incomplete skew correction and increased power consumption, particularly when correcting skew in thick sheets.
Innovation Solution
A skew correction device that utilizes a registration roller pair driven by a driving unit with adjustable output, combined with an electromagnetic clutch to manage backlash, allowing for precise skew correction by controlling the clutch's activation and disconnection states based on medium characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the electromagnetic clutch is activated to stop the registration roller pair, then skew correction accuracy is improved, but backlash causes the roller to rotate by a fixed amount reducing correction precision
Solution Approach 1:
The driving unit dynamically adjusts its output based on the operational state. During transport, it operates at a first output level. When the electromagnetic clutch activates to stop the registration roller pair for skew correction, the driving unit reduces its output to a second output level smaller than the first output, preventing excessive force that would overcome the clutch's holding capability and cause unintended rotation.
Solution Approach 2:
The system changes the output parameter of the driving unit according to the operational phase. By reducing the output from the first level during transport to the second level during stopping, the system adapts to different operational requirements, ensuring the electromagnetic clutch can reliably maintain the stopped state without being overcome by residual driving force.
2Productivity
If the driving unit operates at high output during transport, then productivity is improved, but power consumption increases when the electromagnetic clutch is activated
Solution Approach 1:
The driving unit operates in periodic cycles, alternating between high output during transport phases and reduced output during stopping phases. This periodic adjustment of output levels optimizes the balance between productivity during transport and power consumption during the stopping phase when the electromagnetic clutch is activated.
Solution Approach 2:
The driving unit dynamically adjusts its output power based on the operational state transitions. During medium transport, it delivers high output for maximum productivity. When transitioning to the stopped state via electromagnetic clutch activation, it reduces output to minimize power consumption, avoiding unnecessary energy expenditure during the holding phase.
3Manufacturing precision
If the electromagnetic clutch holds the registration roller pair in the stopped state, then skew correction is achieved, but the driving unit must overcome backlash force requiring higher output
Solution Approach 1:
The driving unit dynamically adjusts its output force based on the operational state. During transport, it applies sufficient force to overcome friction and move the medium. When the electromagnetic clutch activates to stop the registration roller pair, the driving unit reduces its output force to a lower level, allowing the clutch to hold the stopped state without requiring excessive force to overcome backlash.
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 eliminates backlash, reduces power consumption, and enhances skew correction accuracy while minimizing the size and cost of the driving unit, thereby improving overall medium processing efficiency and throughput.
Implementation Method 1
an electromagnetic clutch configured to stop the registration roller pair in an activated state and release the registration roller pair in a disconnected state
Data Source
AI summary
An skew correction device includes a registration roller pair, a driving unit that drives the registration roller pair, an electromagnetic clutch that stops the registration roller pair in an activated state and releases the registration roller in a disconnected state, and the driving unit drives the registration roller pair with a first output when the registration roller pair transports the medium, and performs driving with a second output smaller than the first output in the activated state. As a result, skew correction of the medium is performed in a state in which a backlash is eliminated.