Stamping Press Ejector Coupling for Reliable Round Blank Ejection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stamping press configurations face challenges in adjusting the stroke movement of the ejector pin to ensure reliable ejection of stamped round blanks while maintaining faultless feeding of round blanks into the stamping ring, particularly due to the coupling of the ram with the ejector pin through a lever transmission.
Innovation Solution
A stamping press design where the ejector pin is supported by an actuating device movably coupled with the ram, allowing independent stroke movement, and a connection device with a connection rod couples the ram and actuating device without a gear transmission ratio, enabling adjustable stroke length to compensate for wear and ensuring the ejector pin does not impede the second stamping tool until it reaches the stamping position, with a coupling device that can decouple the movement in the return stroke to prevent premature ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lever transmission is used to couple the ram with the ejector pin, then the ejector pin can be driven during the return stroke, but the stroke movement of the ejector pin becomes difficult to adjust and may impede the second stamping tool
Solution Approach 1:
The patent applies the dynamics principle by making the connection between the ram and actuating device adjustable rather than fixed. The connection rod includes an adjustment device that allows the effective length to be modified, enabling dynamic adaptation of the ejector pin stroke to different operating conditions and compensating for wear over time.
Solution Approach 2:
The patent implements parameter changes by allowing the geometric parameters of the connection rod (specifically its effective length) to be changed through the adjustment device. This enables modification of the transmission ratio and stroke characteristics of the ejector pin to optimize ejection reliability while preventing interference with the stamping tool.
2Reliability
If the ejector pin is coupled with the ram through a connection device, then the ejector pin can be actuated during return stroke, but the connection device must prevent force transmission during the forward stroke to avoid impeding the stamping tool
Solution Approach 1:
The patent applies periodic action by designing the connection device to be active only during the return stroke phase and inactive during the forward stroke phase. The coupling device engages and disengages periodically with the ram movement, allowing force transmission only when needed for ejection while preventing interference during stamping.
Solution Approach 2:
The patent uses an intermediary approach by introducing a coupling device as a mediator between the ram and actuating device. This coupling device selectively transmits or blocks force based on the stroke direction, acting as a controlled interface that enables periodic force transmission without continuous connection.
3Ease of manufacture
If the connection rod has a fixed length, then the structure is simple, but it cannot compensate for wear and maintain proper stroke adjustment
Solution Approach 1:
The patent transforms the static connection rod into a dynamic structure with adjustable length. The adjustment device enables modification of the connection rod's effective length to compensate for wear and maintain proper geometric relationships between components throughout the operational life of the stamping press.
Solution Approach 2:
The patent implements self-service by providing an adjustment mechanism that allows operators to maintain optimal performance without requiring complex replacement procedures. The adjustment device enables on-site modification of the connection rod length to compensate for wear, extending the service life and maintaining reliability.
Data Source
AI summary
A stamping press for stamping a round blank. A ram movable in a stroke direction and in an opposite return stroke direction carries a first stamping tool. A second stamping tool and a stamping ring are supported on a press framework. The stamping tools and a stamping opening formed by the stamping ring are aligned along a working axis. An ejector device serves to eject a stamped round blank from the ring opening. It comprises an ejector pin supported on an actuating device that is movably coupled with the ram. During a return stroke of the ram the ejector pin can apply a force on the second stamping tool in order to press the round blank out of the stamping ring. In a ram movement in the stroke direction the actuating device departs from the second stamping tool and no ejector pin force is applied on the second stamping tool.