Bag Forming Sealing Bars with Adjustable Drive Shaft
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Solution Overview
Problem
Existing bag forming apparatuses face challenges in achieving precise and efficient sealing at high speeds while maintaining operator safety and facilitating maintenance, as they often require complex drive systems and lack adjustable sealing bar gaps.
Innovation Solution
The apparatus features a translatable drive shaft and linear bearing rails that adjust the closure gap between sealing bars, allowing for synchronized reciprocal motion and variable sealing times, with cam lobes controlling the stroke length and a rotational drive for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequent and accurate reciprocal movement of sealing bars is required for high-speed processing, then productivity is improved, but device complexity increases due to frequent engagement and disengagement cycles
Solution Approach 1:
The patent combines the drive mechanisms for both sealing bars into a single common drive shaft that rotates to simultaneously control both bars. This merging of drive functions reduces the number of separate motors and control systems needed, thereby reducing device complexity while maintaining high-speed processing capability through the efficient rotational motion of the unified drive shaft.
Solution Approach 2:
The common drive shaft serves multiple functions: it drives both sealing bars for sealing operations, provides adjustable stroke length through cam mechanism, enables variable separation distance for safety and maintenance, and allows synchronized operation of both bars. This multi-functionality reduces the need for separate specialized mechanisms for each function, reducing overall device complexity.
2Manufacturing precision
If sealing bars are positioned close together for precise sealing, then manufacturing precision is improved, but operator safety deteriorates due to increased heat radiation risk during stoppages
Solution Approach 1:
The patent implements a dynamically adjustable separation mechanism where the distance between sealing bars can be varied. During active sealing operations, bars are positioned close together for precise sealing. During stoppages or maintenance, the bars can be separated to a safe distance, reducing heat radiation risk. This dynamic adjustment capability resolves the contradiction between maintaining close positioning for precision and separating for safety.
Solution Approach 2:
The patent changes the positional parameter (separation distance) between sealing bars based on operational state. The adjustable closure gap allows the system to optimize the distance parameter - minimal gap during sealing for precision, and increased gap during stoppages for safety. This parameter change capability enables the system to satisfy both precision and safety requirements at different times.
3Device complexity
If fixed closure gap between sealing bars is used, then device complexity is reduced, but adaptability deteriorates due to inability to adjust for different operating conditions
Solution Approach 1:
The patent incorporates an adjustable closure gap mechanism that allows the separation distance between sealing bars to be modified. The cam mechanism with adjustable stroke length enables the system to adapt to different sealing requirements, material types, and operational conditions while maintaining a relatively simple overall drive structure based on the common rotational shaft.
Solution Approach 2:
The system transitions from a fixed gap configuration to a dynamically adjustable gap configuration. The ability to modify the closure gap and stroke length provides adaptability for different operating conditions while the underlying common drive shaft mechanism maintains relative simplicity. This dynamic adjustability resolves the contradiction between simplicity and versatility.
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
This configuration enables higher speed operation, precise sealing, and reduced risk of overheating or damage, while allowing for increased separation for maintenance and stoppages, enhancing operational efficiency and safety.
Implementation Method 1
The guide arms 14 are connected to the drive shaft 16 by drive linkages 36, which advantageously facilitate translational movement of the drive shaft 16 relative to the mounting frame 12
Implementation Method 2
a pair of linear bearing rails, each linear bearing rail slidably connecting a respective one of the pair of guide arms to the mounting frame
Implementation Method 3
pressing layers of film between heated sealing bars to seal one or more sides or edges of the pouch
Data Source
Figure 1~2
Figure 3A~3B
AI summary
A bag forming apparatus (10) includes a pair of opposed sealing bars arranged on opposite sides of a forming plane, a pair of guide arms (14), each extending from a first arm end (329) through the forming plane to a second arm end (34) and carrying a respective one of the pair of opposed sealing bars, a mounting frame (12) to which the pair of guide arms (14) are movably mounted between the first (32) and second (34) arm ends, and a drive shaft connected to the second arm end (34) of each of the pair of guide arms (14) such that shaft rotation is operable to move the pair of opposed sealing bars into and out of engagement across a web of bag forming material traveling therebetween in the forming plane. The drive shaft can be translatable relative to the mounting frame (12) to adjust a closure gap between the pair of opposed sealing bars.