Supplement Feeder Knocking Unit for Flat Object Separation
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Solution Overview
Problem
Existing devices for loosening and separating flat objects from a stack often result in jamming and compression, leading to malfunctions such as double or multiple takeoffs due to micro jumps caused by continuous vibrations.
Innovation Solution
A receiving device with guiding elements and a knocking unit that applies discrete knock impacts at defined intervals to loosen the objects uniformly without compression, using a movable weight or piston to transmit these impacts to guide rails or a stack shoe, ensuring a consistent takeoff force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous vibrations are transmitted to the stack support table to loosen sheets, then sheet separation is improved, but micro jumps cause jamming and compression leading to multiple takeoffs
Solution Approach 1:
The patent applies periodic knocking impulses instead of continuous vibrations. A knocking device delivers discrete, periodic impacts to the stack at controlled intervals, creating a rhythmic loosening effect that prevents continuous micro jumps while maintaining sheet separation reliability. This periodic action resolves the contradiction by providing sufficient loosening force without causing the harmful continuous vibration effects.
Solution Approach 2:
The patent extracts the harmful continuous vibration component while retaining the beneficial sheet-loosening effect through discrete knocking impulses. By removing the continuous vibration mechanism and replacing it with intermittent knocking, the system eliminates micro jump jamming and compression while preserving the essential sheet separation function.
2Productivity
If vibration frequency is increased to improve sheet loosening, then separation effectiveness improves, but compression of the stack increases causing malfunctions
Solution Approach 1:
The knocking device delivers impulses at optimized periodic intervals that provide sufficient loosening force for high-speed sheet takeoff while avoiding excessive stack compression. The periodic nature allows the stack to recover between impulses, preventing cumulative compression that would cause malfunctions.
Solution Approach 2:
The patent changes the vibration parameter from continuous high-frequency vibration to discrete periodic knocking impulses. This parameter transformation maintains sheet loosening effectiveness for high productivity while reducing the compressive stress on the stack that leads to malfunctions.
3Reliability
If vibration amplitude is increased to prevent adhesion, then sheet separation improves, but micro jumps increase causing jamming in roller nip
Solution Approach 1:
The knocking device applies periodic impulses that create sufficient separation force to prevent adhesion between sheets without generating excessive micro jumps. The intermittent nature of the knocking allows sheets to settle between impulses, preventing the cumulative micro jump effects that cause roller nip jamming.
Solution Approach 2:
The patent extracts the harmful high-amplitude continuous vibration that causes excessive micro jumps while retaining the adhesion-preventing effect through optimized periodic knocking impulses. This selective extraction resolves the contradiction between preventing adhesion and avoiding roller nip jamming.
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
Prevents adhesion and compression, ensuring reliable and uniform takeoff of individual objects by applying discrete knock impacts, reducing the likelihood of malfunctions like double or multiple takeoffs.
Implementation Method 1
a knocking unit (3) with which a discrete knock impact can be transmitted onto a guiding element (2, 8)
Data Source
AI summary
A supplement feeder for flat objects, comprising a receiving device with a stack compartment for receiving objects in the form of a stack, and a takeoff device for taking off individual objects from the stack, wherein the stack compartment has a front contact region against which the front edge of the stack rests, and equipped with guiding elements for guiding and shaping the stack, comprising a stack shoe that is arranged at the rear edge of the stack in order to guide the stack in the direction of the front contact region. According to the disclosure, this supplement feeder is equipped with a takeoff device for taking off individual objects from the object stack, and at least one component of the guiding elements, and in particular the stack shoe, is coupled to a knocking unit that transmits a discrete knock impact onto the respective component of the guiding element. Thereby malfunctions in the form of missed takeoffs or multiple takeoffs when taking off objects can be largely avoided.