Top-Fed Card Feeding System for Bacon Packaging
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Solution Overview
Problem
Existing card feeding systems for food products, particularly in high sanitation environments, face issues with precision placement, reliability, and efficiency due to double feeds, missed feeds, and jams when handling rigid substrates like cards under shingled bacon slices, especially in moist conditions.
Innovation Solution
A card feeding system with a frame and housing, featuring a feed conveyor, outfeed conveyor, pivot arm, picker arm with suction cups, and a controller that ensures precise positioning and singulation of cards, using a combination of mechanical and vacuum mechanisms to handle card stacks and prevent double feeds, with sensors for real-time control and card detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If weight-based friction feeding is used to pull cards from the bottom of the stack, then the system can feed cards continuously, but double feeds and missed cards occur due to insufficient friction control
Solution Approach 1:
The patent inverts the traditional bottom-fed card stacking approach by implementing top-fed card stacking. Instead of pulling cards from the bottom of the stack, the system picks cards from the top surface, eliminating the friction and weight dependency issues that caused double feeds and missed cards. This inversion fundamentally resolves the reliability problem while maintaining continuous feeding capability.
Solution Approach 2:
The patent replaces the mechanical friction-based card feeding mechanism with a vacuum-based suction system. The vacuum pick-up mechanism uses negative pressure to lift and hold cards from the top of the stack, providing precise control over card pickup without relying on friction coefficients or weight-based forces, thereby eliminating feeding errors.
2Ease of operation
If suction cups are used to lift cards from the top of the stack, then card pickup is improved, but multiple cards are lifted together causing double feeds
Solution Approach 1:
The patent applies local quality by creating a restricted vacuum application zone. The vacuum pick-up mechanism is designed with a limited pickup area that only engages with the topmost card, preventing simultaneous engagement of multiple cards. This localized vacuum application ensures that only one card is selected at a time, resolving the reliability issue while maintaining ease of operation.
Solution Approach 2:
The patent segments the card stack interaction into discrete, controlled phases: vacuum application to the top card only, controlled lift, and sequential feeding. This segmentation prevents multiple cards from being engaged simultaneously by dividing the pickup process into isolated stages, ensuring single-card selection reliability.
3Device complexity
If cards are fed from the bottom of the stack, then the feeding mechanism is simple, but precision placement is not achieved requiring manual rework
Solution Approach 1:
The patent implements preliminary action by pre-positioning the card on a delivery conveyor with precise alignment features before the product arrives. The card is staged in advance with exact positioning, ensuring that when the product is placed on the card, precision placement is achieved without requiring complex real-time adjustment mechanisms.
Solution Approach 2:
The patent introduces an intermediary card delivery conveyor that acts as a buffer and precision positioning stage between the card stack and the product. This intermediary mechanism provides the necessary precision placement while keeping the overall system relatively simple by separating the card pickup function from the placement function.
4Adaptability or versatility
If traditional card feeding systems are used in wet environments, then the system can operate in high sanitation conditions, but performance degrades due to moisture affecting friction
Solution Approach 1:
The patent replaces the friction-based mechanical feeding system with a vacuum-based system that is insensitive to moisture. The vacuum pick-up mechanism relies on pressure differential rather than friction, allowing it to operate reliably in wet, high-sanitation environments where traditional friction-based systems fail due to moisture reducing friction coefficients.
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
Enables continuous feeding of cards at high speeds (up to 100 cards per minute) with reduced double feeds and jams, ensuring precise placement and efficient operation in high sanitation environments, including wet conditions.
Implementation Method 1
at least two of the suction cups are spaced apart from one another along the support bar for contacting and holding an uppermost one of the cards in the card stack to the picker arm
Implementation Method 2
The pivot arm is movable between an open, card receiving position, and a feed position in which the pivoting pinch roll is pressed against the fixed pinch roll
Implementation Method 3
A pair of delivery rolls is located in proximity to the delivery end
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.