Rigid Connection Elements for Pitch Variation Apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing repitching apparatuses for varying the pitch of moving articles, particularly in machines producing absorbent sanitary articles, face issues with frequent maintenance due to fatigue-induced breakage of flexible tubes used for connecting transport elements to a rotary distributor, necessitating frequent replacements.
Innovation Solution
The apparatus employs rigid connection elements made of metal or self-lubricating plastic, such as PTFE, to establish a pneumatic connection between transport elements and a rotary distributor, eliminating the need for flexible tubes and ensuring continuous suction during pitch variation without interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible tubes are used to connect transport elements to the rotary distributor, then the apparatus can accommodate angular displacements and speed variations, but the flexible tubes breakage due to fatigue occurs frequently requiring maintenance
Solution Approach 1:
The connection system is divided into multiple rigid connection elements, each associated with a specific transport element. These segmented rigid connections replace the single flexible tube system, allowing each connection to be optimized for its specific motion requirements while maintaining overall system adaptability.
Solution Approach 2:
The rigid connection elements are designed to dynamically adapt to angular displacements and speed variations through their geometric configuration and motion coupling with the rotary distributor. This dynamic design maintains reliable rigid connections while accommodating the varying operational conditions without requiring flexible materials.
2Reliability
If rigid connection elements are used to connect transport elements to the rotary distributor, then maintenance needs are reduced by preventing fatigue-related breakage, but the ability to accommodate angular displacements and speed variations may be limited
Solution Approach 1:
The rigid connection elements incorporate dynamic geometric relationships that allow them to accommodate angular displacements and speed variations while maintaining rigid structural integrity. The connection geometry is designed to naturally adapt to the varying operational conditions through controlled motion paths.
Solution Approach 2:
The rigid connection elements serve as intermediaries between the transport elements and the rotary distributor, translating and mediating the motion requirements. These connection elements convert the angular displacements and speed variations into compatible motion patterns while maintaining rigid structural connections.
3Ease of operation
If flexible tubes are used for pneumatic connection, then angular displacements between transport elements and rotary distributor are accommodated, but cyclic deformations cause breakage over time
Solution Approach 1:
The pneumatic connection system is segmented into multiple rigid connection elements, each providing a stable, non-deforming pneumatic pathway. This segmentation eliminates the cyclic deformation issues inherent in flexible tubes while maintaining the ability to accommodate angular displacements through the rigid connection geometry.
Solution Approach 2:
The flexible mechanical tube system is replaced with a rigid mechanical connection system that uses pneumatic principles to achieve the same functional outcome. The rigid connections eliminate mechanical fatigue from cyclic deformation while maintaining pneumatic flexibility through pressure-controlled 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
This solution reduces maintenance needs by preventing fatigue-related breakage of connection elements, ensuring stable and continuous operation by maintaining pneumatic contact between transport elements and the rotary distributor, even during speed variations.
Implementation Method 1
The gripping surfaces are selectively pneumatically connected to a stationary suction volume through a rigid connection element
Implementation Method 2
rigid connection elements made of metal or self-lubricating plastic, such as PTFE, to establish a pneumatic connection between transport elements and a rotary distributor
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An apparatus for varying the pitch between moving articles, comprising: - a stationary structure (12, 14) having a suction volume (16), - a plurality of transport elements (28) rotatable independently from each other about an axis (a) and having respective gripping surfaces (32) provided with suction holes (34), - a rotary distributor (38) rotatable about said axis (a) independently of said transport elements (28), wherein the rotary distributor (38) has a plurality of intake ducts (46) having first openings (48) selectively connected to said suction volume (16) and second openings (50) located on an interface surface (44) of said rotary distributor (38), - a plurality of rigid connection elements (52) that establish a pneumatic connection between respective transport elements (28) and said rotary distributor (38), wherein said rigid connection elements (52) are fixed with respect to respective transport elements (28) and have respective sliding surfaces (54) in sliding contact with said interface surface (44), wherein said rigid connection elements (52) have respective suction chambers (56) elongated in the circumferential direction and open on said sliding surfaces (54), wherein said suction chambers (56) are pneumatically connected to said suction holes (34) of respective transport elements (28) and are connected pneumatically to respective second openings (50) of the rotary distributor (38).