The ejector pins, sleeves or stripper actuators, together with their retainer and backing plates, form the ejection assembly.
As discussed previously, it is desirable, wherever possible, for the complete assembly to be symmetrically balanced to avoid out-of-balance forces that may create premature wear or damage.
Mechanical Ejection
A typical mechanical ejection system with a spring return is shown in Figure 10.9. In this case the ejectors are
Sometimes it is advantageous to strip components by pulling a stripper plate from the front half of the tool. A basic system is shown in Figure 10.10.
The mechanically operated bar ejection, shown previously, is very widely used. However, this method is not very controllable and imparts a high initial force on the ejection system.
For more fragile components this approach may be too severe and a more controlled method is preferred. A method that is frequently used for such cases involves the use of toggle systems, which
apply more controllable and gentler forces.
Walsh's Plastic consulting. 