Forming Tool Transmission for Single-Drive Linear-Rotary Motion
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Solution Overview
Problem
Existing injection molding technologies require separate drives for linear and rotating movements of index shafts, leading to complexity and inefficiency.
Innovation Solution
A transmission device that integrates a shaft with radial recesses and protrusions, allowing a single drive to achieve both linear and rotating movements through a combined kinematic connection, eliminating the need for separate drives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two different drives (linear drive and rotation drive) are used to move the index shaft, then both linear and rotating movements can be achieved, but the device complexity increases
Solution Approach 1:
The patent combines the functions of linear movement and rotation into a single drive system. The index shaft is designed with a cam profile that converts the linear reciprocating motion from one drive into combined linear and rotational movements, eliminating the need for separate linear and rotation drives while maintaining the capability to perform both types of motion
Solution Approach 2:
The single drive system is designed to perform multiple functions: it provides both the linear reciprocating motion and the rotational motion required for the index shaft. The cam mechanism on the index shaft enables this multi-functionality by translating the linear drive output into combined linear and rotational movement of the index plate
2Measurement precision
If separate linear drive and rotation drive are provided, then precise control of movements is possible, but the ease of operation deteriorates
Solution Approach 1:
By merging the control functions into a single drive system with a cam mechanism, the patent simplifies operation while maintaining precision. The cam profile is designed to provide precise rotational positioning at specific points in the linear stroke, ensuring accurate control of the index plate rotation and linear movement without requiring complex coordination between multiple drives
3Adaptability or versatility
If hydraulic cylinders and electric motor are used for linear and rotation movements, then the movements can be achieved, but the device complexity increases
Solution Approach 1:
The patent merges the functions of hydraulic cylinders (for linear movement) and electric motor (for rotation) into a single drive system. The index shaft with cam profile converts the linear reciprocating motion into combined linear and rotational movements, eliminating the need for separate hydraulic and electric drive systems while maintaining the capability to perform both types of motion
Solution Approach 2:
The single drive system with cam mechanism performs multiple functions that previously required separate hydraulic and electric drives. The cam profile enables the index shaft to convert linear reciprocating motion into both linear displacement and rotation, providing universal functionality with a single drive type
Data Source
AI summary
A transmission device configured to transpose a drive movement of a drive into a linear and rotating movement of a first tool part of a forming tool of a forming device, the transmission device including a shaft, including a shaft axis; a first interface; a second interface, wherein the first interface is configured to connect the shaft with the first tool part at least torque proof, and the second interface is configured to connect the shaft with the drive at least by axial fixing; and a housing supporting the shaft is rotatable about the shaft axis and displaceable on a linear path parallel to the shaft axis, wherein at least one radial recess is arranged at an outer radial circumferential surface of the shaft, and at least one radial protrusion cooperating with the at least one radial recess is arranged at least at one guide element of the housing.