Convey Control Device for Long Objects Using Buffer Unit Tension
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Solution Overview
Problem
Existing convey control devices for long objects, such as treatment agent applying devices in inkjet recording systems, face issues where tension applying units fall to a lower limit position during starting and stopping operations, leading to instability in conveying and inability to apply tension to the recording medium.
Innovation Solution
A convey control device with an upstream side conveying unit, a buffer unit, and a downstream side conveying unit, where the buffer unit cancels out loosening with gravity, and a driving source that restricts and controls the conveying units based on conveying speed information from a downstream device, ensuring stable tension application by releasing restrictions only when conveying speed meets minimum requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the electromagnetic brake is turned off to allow the dancer unit to hang down and apply tension to the recording medium, then tension application is enabled, but the dancer unit may fall down to a lower limit position when the conveying units have insufficient holding force
Solution Approach 1:
The electromagnetic brake is controlled to be turned off in advance before the conveying units start conveying the recording medium, allowing the dancer unit to hang down and apply tension beforehand. This preliminary action ensures that when conveying begins, the recording medium is already under proper tension, preventing the dancer unit from falling to the lower limit position during operation.
2Reliability
If the electromagnetic brake is kept on to prevent the dancer unit from falling, then conveying stability is maintained, but tension cannot be applied to the recording medium
Solution Approach 1:
The electromagnetic brake operates periodically: it is turned off during the conveying operation to allow tension application, and turned on during idle periods to prevent the dancer unit from falling. This periodic control ensures both tension application during conveying and stability during non-conveying states.
3Productivity
If the conveying units start immediately upon receiving a convey start instruction, then productivity is improved, but the dancer unit may fall down due to insufficient initial holding force
Solution Approach 1:
Upon receiving a convey start instruction, the electromagnetic brake is turned off in advance before the conveying units actually start moving the recording medium. This preliminary brake release allows the dancer unit to hang down and apply tension before conveying begins, ensuring stable operation from the start while maintaining rapid response to convey instructions.
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
Prevents tension applying units from falling, ensuring stable conveying of long objects by maintaining tension application during start and stop operations, thereby enhancing the stability and reliability of the conveying process.
Implementation Method 1
the buffer unit has a function of being hung down by the long object between the upstream side conveying unit and the downstream side conveying unit and cancelling out a loosening amount of the long object with gravity of the buffer unit
Data Source
AI summary
A convey control device for a long object includes an upstream side conveying unit, a buffer unit, a downstream side conveying unit, and a convey control unit. When starting to convey the long object, by a catalyst of starting output of conveying speed information of the long object output after receiving a convey start instruction sent from another device following the downstream side conveying unit, the convey control unit releases the restricting of a driving source of the upstream side conveying unit and the downstream side conveying unit and starts the convey control of the long object.