Spacer Wheel Assembly for Composite Cigarette Filter Precision
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Solution Overview
Problem
Existing apparatus for producing composite cigarette filters suffers from imprecision in the length of external filter rod segments and air gaps in recess filters, leading to variations in filter quality and increased waste due to relative movement of filter segments before wrapping, necessitating continuous monitoring and rejection of off-specification products.
Innovation Solution
The apparatus employs a spacer wheel assembly with intermeshing wheels to maintain precise positioning of filter segments during transportation and wrapping, preventing relative movement and ensuring consistent segment lengths and air gaps, thereby enhancing production precision and reducing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If filter segments are transported freely before wrapping, then the apparatus is simpler to operate, but the positioning precision of filter segments deteriorates
Solution Approach 1:
The spacer wheel assembly pre-positions the filter segments on its circumference before the wrapping operation begins. The segments are held in fixed positions by the spacer wheels during transport, and only released at the exact moment they need to be wrapped, ensuring precise positioning without requiring complex control systems during the entire transport process.
Solution Approach 2:
The spacer wheel assembly acts as an intermediary device between the filter segment supply and the wrapping mechanism. It temporarily holds and positions the segments with precise spacing, then delivers them to the wrapping station in the correct positions, eliminating the need for direct complex coordination between supply and wrapping systems.
2Manufacturing precision
If filter segments are held in fixed positions during transport, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The spacer wheel assembly is divided into multiple individual wheels, each responsible for holding and positioning a specific filter segment. This segmentation allows each wheel to be a simple, identical component that can be easily manufactured and replaced, reducing overall system complexity while achieving precise positioning through the coordinated action of multiple simple elements.
Solution Approach 2:
All spacer wheels are designed to be identical in size, shape, and spacing characteristics, creating an equipotential system where each wheel performs the same function under the same conditions. This uniformity simplifies the design and manufacturing of the entire apparatus, as only one wheel design needs to be developed and replicated.
3Reliability
If continuous monitoring is implemented to detect off-specification products, then quality control is improved, but productivity decreases
Solution Approach 1:
The spacer wheel assembly pre-positions all filter segments with precise spacing before the wrapping and cutting operations begin. This preliminary positioning ensures that when cuts are made, the external filter rod segments and air gaps will be of consistent lengths, eliminating the need for post-production monitoring and rejection of off-specification products.
Solution Approach 2:
The invention converts the potential harm of production variations into a benefit by using the spacer wheel geometry itself as the defining element for segment spacing. The fixed physical dimensions of the spacer wheels directly determine the precise spacing of filter segments, turning a mechanical constraint into a quality assurance feature that eliminates the need for monitoring and rejection systems.
Data Source
AI summary
Method and apparatus for producing discrete filter rods includes a first conveyor for transporting filter segments of given length in a downstream direction. Three counter rotating transfer wheels receive the filter segments between spaced apart cleats on the circumference of the wheels. The first wheel receives the filter segments from the first conveyor and transfers the segments to the second wheel which in turn transfers the segments to the third wheel. Filter segments between the cleats on the third wheel are deposited upon a second conveyor with plug wrap thereon in precisely spaced apart relationship. Granular adsorbent material is filled into cavities between the filter segments, and a garniture folds the plug wrap around the filter segments and the filled cavities therebetween.