Vacuum Friction Feeder with Adjustable Exposure Table
Solution Overview
Problem
Conventional friction feeders face difficulties in feeding diverse types of flat stock, such as thick, rigid, wide, or limp materials, due to limitations in adjusting the 'wedge' design, which affects the exposure and control of material, leading to inconsistent feeding and limited hopper capacity, especially when handling long or dense products.
Innovation Solution
A vacuum friction feeder with a horizontal exposure table and adjustable components, including a vacuum friction belt with holes, rollers, and a movable separator, allows for optimal exposure and control of flat stock, enabling the feeding of various product sizes and types by adjusting the suction pressure and belt alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional wedge design is used to expose material to belts, then feeding control is simplified, but the ability to feed different types of flat stock (thick, rigid, wide, limp) is limited
Solution Approach 1:
The patent employs a movable exposure table that can be adjusted horizontally to dynamically change the amount of material exposed to the vacuum friction belts. This dynamic adjustment mechanism allows the same device to accommodate various material types (thick, rigid, wide, limp) by simply repositioning the table, thereby achieving versatility without significant structural complexity
Solution Approach 2:
The invention changes the exposure parameter by moving the table horizontally relative to the belts. This parameter change enables adaptation to different material types and lengths without redesigning the entire wedge structure, resolving the contradiction between versatility and device complexity
2Manufacturing precision
If the wedge angle is adjusted to expose optimal material amount, then single-piece feeding is achieved, but hopper capacity is reduced
Solution Approach 1:
The invention separates the exposure function from the storage function by using a movable table that can be independently adjusted. The hopper maintains full capacity for storing materials, while the table provides precise exposure control for single-piece feeding, eliminating the trade-off between hopper capacity and feeding precision
3Reliability
If material is loaded high in the hopper to accommodate long products, then feeding consistency is maintained, but loading height becomes unmanageable
Solution Approach 1:
The movable exposure table allows the system to dynamically adapt to different product lengths by adjusting the table position rather than requiring fixed high loading. This maintains feeding consistency for long products while keeping the loading height within manageable limits, improving ease of operation
4Manufacturing precision
If the wedge is set close to the leading edge for limp feed stock, then exposure is optimized, but product back becomes unsupported causing feeding problems
Solution Approach 1:
The patent introduces product support elements as intermediaries between the exposure table and the material. These supports prevent the product back from becoming unsupported when the wedge is set close to the leading edge for limp materials, thereby maintaining both exposure optimization and feeding reliability
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 enables consistent, single-piece feeding of a wide range of products, from thin to dense, and long to wide, with improved hopper capacity and ease of loading, reducing operational challenges and enhancing feeding efficiency.
Implementation Method 1
a suction pressure can be drawn through the plurality of holes provided in the at least one vacuum friction belt as the plurality of holes pass over the suction port
Data Source
AI summary
A vacuum friction feeder including at least one vacuum friction belt provided with a plurality of holes, a pair of rollers, a table top provided with at least one suction port, an exposure table having a substantially horizontal top surface and a separator. The at least one vacuum friction belt is adapted to rotate around the table top while supported by the rollers such that a suction pressure can be drawn through the plurality of holes provided in the at least one vacuum friction belt as the plurality of holes pass over the suction port. The exposure table is operatively associated with the table top and is adapted to be movable relative to the table top in a plane defined by the substantially horizontal top surface to adjust the portion of the bottommost product in the stack of products exposed to the at least one vacuum friction belt.