Sheet Cutting Apparatus Blade Running-On Detection
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Solution Overview
Problem
Existing sheet cutting apparatuses are unable to detect the phenomenon of a movable blade running onto a fixed blade, known as 'running-on', which can occur due to paper thickness or double-feeding, leading to paper jams and preventing cutting.
Innovation Solution
A sheet cutting apparatus with a conveyor, a cutter having first and second blades, and a controller that monitors the moving state of the first blade using a signal outputter to detect abnormalities and adjust power settings to prevent and correct running-on by stopping and repositioning the blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the movable blade is moved toward the fixed blade to cut the sheet, then the cutting function is achieved, but the risk of running-on increases due to load from paper thickness or double-feeding
Solution Approach 1:
The controller performs preliminary detection of the movable blade's moving state before completing the cutting action. By monitoring the motor current during blade movement and detecting anomalies that indicate running-on conditions, the system can identify problems before they cause paper jams, allowing for preventive intervention
Solution Approach 2:
The system continuously monitors the moving state of the movable blade through signal outputters that detect variations in motor current and blade position. This feedback mechanism allows the controller to real-time detect running-on conditions and adjust the cutting process accordingly, preventing paper jams by stopping the blade movement when abnormalities are detected
2Productivity
If the movable blade moves at normal speed to maintain productivity, then cutting efficiency is improved, but the ability to detect running-on abnormalities is reduced
Solution Approach 1:
The controller performs periodic detection of the movable blade's moving state during the cutting process by monitoring motor current at regular intervals. This periodic monitoring maintains normal cutting speed and productivity while ensuring that running-on abnormalities are detected through repeated measurements of the blade's movement characteristics
Solution Approach 2:
The system dynamically adjusts the detection strategy based on the cutting process stage. During normal cutting operations, the blade moves at full speed for productivity, while the monitoring system adapts its detection sensitivity based on expected current variations, enabling accurate running-on detection without compromising cutting efficiency
3Reliability
If the blade is stopped immediately upon detecting abnormality, then paper jam prevention is improved, but incomplete cutting occurs
Solution Approach 1:
When running-on is detected, the controller performs preliminary intervention by stopping the movable blade before it can cause a paper jam. The system then executes a recovery sequence that repositions the blade and attempts to complete the cut, ensuring both paper jam prevention and cutting completion
Solution Approach 2:
The system converts the harmful effect of running-on into a detectable signal that triggers a controlled recovery process. By detecting the abnormality early and using it to initiate a blade repositioning and retry sequence, the system transforms what would be a paper-jamming condition into an opportunity for corrective action that ultimately completes the cutting operation
Data Source
AI summary
There is provided a sheet cutting apparatus including: a cutter including first and second blades and a shifter including an actuator; a signal outputter; and a controller. The controller is configured to execute: a first cutting processing of moving the first blade in a cutting direction by setting a power value of the actuator to be a first power value; a first determining processing of determining whether abnormality in a moving state of the first blade exists; a first stopping processing of stopping the first blade at a first stop position, in a case that the abnormality is determined to exist; a first returning processing of moving the first blade upstream in the cutting direction; and a second cutting processing of moving the first blade in the cutting direction by setting the power value of the actuator to be a second power value greater than the first power value.