Injection Mould Jaw Coupling Rod for Film Positioning
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Solution Overview
Problem
Existing injection molds face complexity and high design and control efforts in producing molded parts with film-coated corner areas, particularly bottle crates, due to intricate constructions and limited undercut forms, which affect reproducibility and cycle time.
Innovation Solution
A coupling rod is used between two mold jaws for mechanical movement coupling, allowing balanced force movement and simplified structural design, enabling easy film introduction and stable mold operation, with jaw guides like dovetail guides for cost-effective and stable production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If biaxially mounted mold jaws are used to bring mold jaws together when the injection mold is open, then a film can be placed over the corner area of the mold jaws, but the control and design effort increases considerably and plastic deformation of the film occurs
Solution Approach 1:
A coupling rod is introduced as an intermediary mechanical element between the two mold jaws. The coupling rod transmits and synchronizes the movement of the mold jaws, eliminating the need for complex biaxial mounting while ensuring precise film positioning. The coupling rod acts as a mediator that coordinates the motion of both jaws through a simple mechanical linkage.
Solution Approach 2:
The complex forced coupling mechanism between mold jaws and guide is extracted and replaced with a simpler coupling rod system. The patent removes the unnecessary complexity of biaxial mounting and guide constraints, keeping only the essential coupling function through the rod that connects the two jaws directly.
2Manufacturing precision
If forced coupling between mold jaws and guide is used to ensure closed corner area, then film position is controlled, but the injection mold cannot guarantee high cycle time in production
Solution Approach 1:
The complex mechanical guide system with forced coupling is replaced by a simpler coupling rod mechanism. This substitution reduces mechanical friction and resistance, allowing faster jaw movement while maintaining the closed corner area. The simplified mechanics enable higher cycle times without sacrificing positioning accuracy.
3Manufacturing precision
If complex guide systems are used for movable mounting of mold jaws, then precise film placement is achieved, but the injection mold requires high control effort and expensive production
Solution Approach 1:
The patent replaces expensive, complex guide systems with a simple, inexpensive coupling rod mechanism. The coupling rod is a basic mechanical component that is cheap to manufacture yet effective in achieving precise film placement. This approach prioritizes functional simplicity over complex engineering solutions.
Solution Approach 2:
Instead of using a complex guide system to control jaw movement, the patent inverts the approach by using a simple coupling rod to synchronize the jaws. The control function is achieved through the coupling mechanism itself rather than through external guides, simplifying the overall system design and reducing manufacturing costs.
Data Source
AI summary
The tool (1) has guides (11) i.e. dovetail guides, connected with molding jaws (2, 3), and including jaw guides (15, 15') for movably supporting the molding jaws, and linear guides (16, 16') for movably supporting the jaw guides relative to a mold plate (10). The jaw guides are inclined relative to the linear guides, and designed for combining molding jaw surfaces (6) when the tool is opened. A coupling rod (17) is provided between the molding jaws for mechanical movable coupling of the molding jaws. The molding jaws adjoin at each other with the molding jaw surfaces when the tool is closed.