Cam Follower Output Lever Assembly Without Machining Deformation
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Solution Overview
Problem
Existing cam shed-forming mechanisms in weaving looms face challenges with costly machining operations and deformation issues when attaching rollers to levers, requiring additional straightening steps and precise positioning to manage torsional forces and prevent premature failure.
Innovation Solution
A new output lever design with cam follower rollers features a body with two opposite faces and attachment portions, using a simple and inexpensive assembly of plates and rings with fasteners like rivets, allowing for clevis-mounting without surface machining, ensuring durable and precise attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If machining operations are used to attach rollers to the lever body, then the rollers can be securely mounted, but the manufacturing cost increases and deformations occur requiring additional straightening steps
Solution Approach 1:
The lever body is divided into a main body and separate attachment portions that are formed radially to the main axis. These attachment portions are distinct from each other and from the central portion, allowing independent formation and assembly without complex machining of the entire lever body.
Solution Approach 2:
Attachment devices comprising inner and outer attachments with flanges are introduced as intermediary components between the roller and the lever body. These flanges are formed in plates supported in parallel planes and connected to each other, providing a simple riveted connection that eliminates the need for costly machining operations.
2Manufacturing precision
If machining operations are performed on the lever body, then rollers can be positioned precisely, but internal stresses are released causing deformations
Solution Approach 1:
The lever body is segmented into a central portion and separate attachment portions formed radially to the main axis. This segmentation allows the attachment portions to be formed independently without machining the central portion, preventing stress release and deformations in the main lever body.
Solution Approach 2:
Attachment devices with flanges formed in plates serve as intermediaries that provide precise roller positioning without requiring machining of the lever body itself. The flanges are connected by rivets, creating a stable connection that maintains lever body structural integrity.
3Manufacturing precision
If complex machining and straightening operations are used, then roller positioning can be achieved, but the manufacturing process becomes time-consuming
Solution Approach 1:
The lever body is divided into a central portion and separate attachment portions that are formed radially and distinct from each other. This allows attachment portions to be formed independently using simpler, faster processes without the need for time-consuming machining and straightening operations on the entire lever body.
Solution Approach 2:
Attachment devices comprising inner and outer attachments with flanges are used as intermediaries to achieve precise roller positioning. These flanges are formed in plates and connected by rivets, providing a quick assembly process that eliminates time-consuming machining and straightening operations while maintaining positioning accuracy.
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 design reduces manufacturing costs, eliminates the need for costly machining, and provides a durable attachment method that maintains precision and reduces the risk of premature failure by using a straightforward assembly of plates and rings with fasteners, enhancing the productivity of the loom.
Implementation Method 1
comprises an inner ring, an outer ring and rolling elements interposed between the inner and outer rings such that the outer ring is free to rotate relative to the inner ring about a roller axis parallel to the main axis
Implementation Method 2
The outer attachments are connected to the corresponding attachment portion by lever rivets
Data Source
AI summary
Output lever (11) with cam follower rollers, where the lever has two follower rollers (24A, 24B) connected to a body (110). The body defines a median plane (P11) which has a central portion (116), with two opposing surfaces (117A, 117B), and two attachment portions (122A, 122B), each connected, by means of a respective attachment device (28), to a respective follower roller. Each attachment device has an inner fastener (28A) and an outer fastener (28B), each of which has one or more flanges (30, 32, 34; 30, 32, 34, 70). The flanges are each formed in a plate and bear bears in parallel planes against each other. Each follower roller is clevis-mounted between the inner and outer fastener so that contact surfaces (S242) of the two follower rollers are located on either side of the median plane.