Card Feeding System with Suction Picker Arm
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Solution Overview
Problem
Existing card feeding systems for food products, particularly in high sanitation environments, face issues with double feeds, missed feeds, and jams due to reliance on weight or suction methods, which are not suitable for rigid substrates and fail to ensure precise placement in wash-down environments.
Innovation Solution
A card feeding system with a frame, housing, and conveyors that includes a pivot arm with pinch rolls, a picker arm with suction cups, and sensors for precise control, allowing cards to be fed from the top of the stack, ensuring single card delivery and continuous operation up to 100 cards per minute, with the ability to load new stacks during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If weight-based friction feeding is used to create appropriate friction required to feed cards, then card feeding is achieved, but double feeds or missed cards and jams occur due to insufficient loading against the rollers
Solution Approach 1:
The patent replaces the weight-based friction feeding mechanism with a suction cup-based vacuum lifting system. The suction cups create a vacuum field that adheres to the card surface, providing reliable mechanical attachment that prevents double feeds and jams while enabling consistent high-speed operation. This substitution eliminates the instability inherent in weight-dependent friction systems.
Solution Approach 2:
The patent employs pneumatic principles through the use of suction cups connected to a vacuum source. The pneumatic system creates controlled negative pressure to lift and transport cards through the processing line. This pneumatic mechanism provides precise control over card pickup and release, ensuring reliable single-card feeding at high speeds without the mechanical instability of weight-based systems.
2Ease of operation
If suction cups are used to lift a card from the top of a stack, then card pickup is achieved, but multiple cards are lifted together resulting in double feeds and jams
Solution Approach 1:
The patent applies local quality by designing suction cups with specific surface area and vacuum distribution characteristics that create a localized adhesion zone. The suction cups are sized and positioned to contact only the top card's surface, creating a focused vacuum field that adheres to a single card while leaving underlying cards unaffected. This localized approach prevents multiple card pickup.
Solution Approach 2:
The patent uses partial action by applying vacuum force only to the extent needed to lift a single card. The vacuum pressure and suction cup surface area are calibrated to provide just enough adhesion force for one card, avoiding excessive force that would cause multiple cards to be lifted. This controlled partial action ensures reliable single-card pickup.
3Productivity
If cards are fed from the bottom of a card stack, then card feeding is achieved, but insufficient loading against the rollers causes feeding problems
Solution Approach 1:
The patent inverts the traditional bottom-fed card stacking approach by implementing top-fed card pickup. Instead of pulling cards from the bottom of the stack, the suction cups lift cards from the top surface. This inversion provides superior loading against the rollers because the card is picked up in a controlled manner with full surface contact, ensuring precise placement and eliminating feeding problems associated with bottom-fed systems.
4Productivity
If high speed card feeding is implemented, then productivity is improved, but precise substrate to product placement becomes difficult requiring manual rework
Solution Approach 1:
The patent implements feedback control through sensors that detect card position, product position, and feeding status in real-time. This feedback system allows the control mechanism to adjust timing and positioning dynamically, ensuring precise substrate-to-product placement even at high speeds of up to 100 cards per minute. The feedback loop eliminates the need for manual rework by maintaining precision throughout high-speed operation.
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 system achieves precise and reliable placement of cards beneath food products at high speeds, reducing double feeds and jams, and allows for continuous operation with automatic card stack replenishment, enhancing efficiency and reliability in high sanitation environments.
Implementation Method 1
For systems which utilize suction cups to lift a card from the top of a stack of cards
Data Source
AI summary
A card feeding system that feeds cards from a stack to a conveyor system beneath product being carried. A card feed path arranged between a feed conveyor and the outfeed conveyor includes a fixed feed pinch roll and a pivot arm with a pivoting pinch roll and a pair of delivery rolls. A card stack receiving platform is located beneath a picker arm. An elevator is provided for raising the platform with the card stack. The picker arm has suction cups, and is pivotable from a card pick-up position to a feed position in which the card is positioned between the pivoting and fixed pinch rolls. A controller actuates the elevator, the picker arm, the pivot arm, the fixed and delivery pinch rolls to deliver single ones of the cards as product to be placed on the card transitions from the feed conveyor to the outfeed conveyor.