Bag Making Apparatus Intermittent Feed Tension Control
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Solution Overview
Problem
Existing bag making apparatuses face challenges in accurately positioning sheet panels with respect to processing devices and managing tension, particularly with mono-material and hybrid materials, which can lead to variations in print pitch and uneven tension, affecting the quality and continuity of bag production.
Innovation Solution
A bag making apparatus and method that incorporates an intermittent feed device with sensors and drive rollers to position sheet panels accurately, along with an adjustment device to manage tension, using a movement device to adjust the feed distance based on detected thresholds, ensuring precise positioning and tension control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mono-material is used for sheet panels, then stretchability and ease of positioning are improved, but tension control becomes difficult when tension exceeds allowable range
Solution Approach 1:
A dancer roller is introduced as an intermediary component between the drive rollers. The dancer roller temporarily accumulates mono-material sheet panels when tension becomes excessive, acting as a buffer that prevents tension from exceeding allowable limits while maintaining continuous operation. This mediator component resolves the contradiction by providing both positioning capability and tension protection.
2Strength
If paper-based hybrid material is used for sheet panels, then durability and rigidity are improved, but positioning under tension control becomes difficult
Solution Approach 1:
The patent replaces mechanical tension-based positioning with an optical detection system. Sensors detect marks on the sheet panel to determine position, and drive rollers control feeding based on sensor output rather than relying on tension control. This substitution of mechanical control with optical sensing enables accurate positioning of rigid hybrid materials that are difficult to control under tension.
3Manufacturing precision
If intermittent feed control is used with multiple drive rollers, then positioning accuracy is improved, but tension variation may cause bag making to fail
Solution Approach 1:
The dancer roller serves as a tension buffer between multiple drive rollers. It temporarily accumulates sheet panels when tension varies during intermittent feed cycles, preventing tension from exceeding allowable limits. This ensures that high-accuracy positioning can be maintained without compromising continuous production reliability.
Solution Approach 2:
The system dynamically adjusts the intermittent feed distance based on detected mark positions and tension conditions. By changing the feed distance parameter in response to real-time sensor data and tension monitoring, the system maintains both positioning accuracy and tension within acceptable ranges, preventing production failures.
Data Source
AI summary
A bag making apparatus includes an intermittent feed device for feeding sheet panels, an adjustment device for detecting upper and lower thresholds for a length of the sheet panels included in a section from a first drive roller pair to a second drive roller pair, a movement device for moving a processing device and a sensor together as a movable group in the longitudinal direction of the sheet panels. The movement device moves the movable group upstream in response to the adjustment device detecting the upper threshold and moves the movable group downstream in response to the adjustment device detecting the lower threshold. If the movable group is moved, the intermittent feed device determines an intermittent feed distance based on a moving distance of the movable group in addition to output from the sensor and feeds the sheet panels by the determined distance using the first drive roller pair.