Eccentric Roller Mechanism for Stable Strap Tension in Packing Machines
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Solution Overview
Problem
Previous packing machine cores are unstable in strapping force, complex in structure, and prone to faults due to gear engagement and suction tube control, leading to inefficiencies in strap feeding, tightening, and ironing.
Innovation Solution
A machine core with a simple structure incorporating a strap feeding and returning device with eccentric rollers, a control mechanism using cams and springs, and an ironing adhering and cutting mechanism, allowing for simultaneous strap returning and tightening, and real-time tension regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gear engagement and suction tube control are used to control tightening, then the packing machine can achieve strap tightening function, but the structure becomes complex and reliability decreases
Solution Approach 1:
The patent removes the suction tube control system and inductive switch from the packing machine core, retaining only the essential gear engagement mechanism for strap tightening. This extraction of unnecessary components simplifies the control mechanism while maintaining the core tightening function, directly addressing the contradiction between reliability and device complexity.
Solution Approach 2:
The patent merges the strap feeding, returning, and tightening functions into a single integrated mechanism driven by the drive roller and first driven roller. By combining these functions into one unified system rather than separate controlled mechanisms, the patent reduces overall device complexity while maintaining reliable operation.
2Adaptability or versatility
If multiple components are used for strap feeding, returning, and tightening control, then the packing machine can perform these functions, but the structure becomes complex with more fault points
Solution Approach 1:
The drive roller and first driven roller are designed to perform multiple functions: feeding the strap, returning the strap, and tightening the strap. This multi-functional design allows a single component system to replace what would traditionally require multiple separate mechanisms, reducing the number of components while maintaining full functionality.
Solution Approach 2:
The patent employs a dynamic configuration where the first driven roller can move between different positions (engaged and disengaged states) to enable different operational modes. This dynamic capability allows the same physical components to adapt between feeding, returning, and tightening functions without requiring additional static components for each function.
3Force
If traditional control mechanisms are used, then the packing machine can control tightening operations, but the strapping force becomes unstable
Solution Approach 1:
The mechanism uses the natural rotational motion of the drive roller and the mechanical engagement of the first driven roller to automatically maintain stable strapping force. The system self-regulates through the physical constraints of the roller engagement geometry, eliminating the need for external control mechanisms that would introduce instability. This self-regulating mechanical system ensures consistent strapping force and reliable packing quality.
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 provides a stable and consistent strapping force, reduces failure rates, and improves packing quality by enabling precise control over strap tension and cutting, while allowing for easy maintenance and adjustment.
Implementation Method 1
The first driven roller and the second driven roller are respectively arranged eccentrically. The first driven roller and the drive roller are always in contact with one another and cooperate for feeding and returning the strap.
Implementation Method 2
The strap tightening cam controls the second driven roller by means of a swing system having a reset spring and a regulating spring.
Data Source
AI summary
A machine core of a packing machine includes a packing strap ironing adhering and strap cutting mechanism, an ironing adhering sliding board mechanism, and a control mechanism. The machine core includes a strap feeding and returning and strap tightening device, including a drive roller, a first driven roller, and a second driven roller. According to the entry direction of a packing strap, the first driven roller is located down-stream from the second driven roller. The first and the second driven rollers are arranged eccentrically. The first driven roller and the drive roller are always in contact and cooperate for feeding and returning the strap. The second driven roller is a movable roller, and is controlled by the control mechanism to move to a first matching state with the drive roller and to move out of the first matching state. The machine core enables movement of simultaneous strap returning and tightening.