Bag Production Machine Synchronized Drum and Folding Roller Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bag production machines face limitations in achieving accurate and flexible bag length adjustment, with constraints on maximum length, high risk of jamming, and reduced accuracy due to independent speed control of drive rollers and folding mechanisms.
Innovation Solution
A machine with synchronized drum and folding roller rotation, controlled by programmable means, allowing for independent speed adjustment during different phases of the cycle, and featuring a tear-off bar for precise separation, enabling flexible bag length production with reduced downtime and improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the peripheral speed of the drum and folding roller is adjusted independently of the tubular body speed, then bag length can be changed, but the speed difference cannot be controlled independently and adjustment is complex
Solution Approach 1:
The patent applies dynamics by making the drum and folding roller speeds variable and synchronized with the tubular body speed. The control system dynamically adjusts the peripheral speeds of the drum and folding roller based on the desired bag length, allowing independent speed control while maintaining coordination with the tubular body transport rate. This enables flexible bag length adjustment without complex manual coordination of multiple speed parameters.
Solution Approach 2:
The patent implements feedback control through a control system that monitors the tubular body speed and coordinates the drum and folding roller speeds accordingly. The control system receives information about the tubular body transport rate and automatically adjusts the peripheral speeds of the drum and folding roller to maintain the appropriate speed difference for the desired bag length, simplifying the operation while maintaining precision.
2Manufacturing precision
If the gap between the bar and folding blade is made narrow for precise folding, then fold geometry is constrained, but the position and geometry of the fold are limited
Solution Approach 1:
The patent applies dynamics by making the folding blade position adjustable relative to the drum circumference. The folding blade can be positioned at different angular locations on the drum, allowing the fold geometry and position to be varied while maintaining precision. This dynamic positioning capability enables the system to accommodate different fold requirements without being constrained by a fixed narrow gap configuration.
3Manufacturing precision
If separation rollers and auxiliary rollers are added to perform separation at the folding device location, then separation accuracy improves, but device complexity increases and transport means are required
Solution Approach 1:
The patent merges the separation function with the existing drum and folding roller system. The drum and folding roller themselves perform the separation function by controlling the speed difference with the tubular body, eliminating the need for separate separation rollers and auxiliary rollers. The fold limit also serves as the separation point, combining two functions into one location without requiring additional transport means.
4Ease of operation
If looped belts are used as transport means between separation and folding stations, then transport is enabled, but glue residue soils the belts and creates jamming risks
Solution Approach 1:
The patent extracts the transport function from the system by eliminating the need for looped belts as transport means. Since the fold limit coincides with the separation point and the drum/folding roller system performs both folding and separation at the same location, no intermediate transport means are required. This removes the source of glue residue accumulation and eliminates the jamming risk associated with belts.
Data Source
AI summary
A machine for producing bags includes a station for forming a tube, which forms a band of transversely perforated flexible material into a tube, a holding station for retaining the tube, a folding station for forming a bottom at the end of the tube, a folding roller having a folding blade for folding a flap at the end of the tube and a tear-off bar for pinching the tube against the drum, the folding station and the holding station being configured to jointly exert a traction on the tube and detach a portion of the tube. The tear-off bar is disposed behind the folding blade, the machine controlling the rotation of the folding station to synchronize the drum with the front of the tube.