November 29th, 2011 
Question by Puneet C: What is threefold toggle mechanism in injection molding machines?
Best answer:
Answer by cotopaxi
“TAIWAN UNION PLASTIC MACHINERY CO., LTD.”http://www.tw-union.com/e_htm/machine.htm”The use of eminent firm double-toggle mechanism enlarges the pressure. The high firm steel gives the toggle a long life and assures of super precision products.”The above page has a nice picture of a double toggle mechanism as well.
What do you think? Answer below!
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plasticinjectionmachine
Double toggle action is ideal for compression molding with these fast presses. The functions of material metering, cavity loading and molded part ejection are mechanically interlocked and motivated by the moving press platen. Ejection occurs near the top of the stroke as parts produced are positively stripped off the upper old half and blown out by a cam actuated air blast while at the same time molding power is loaded into the cavities.
The simultaneous feed/eject action of these presses, which never really stops excepts for material curing, yields fastest molding cycles possible.
Double toggle mechanism for moving a moveable die platen of an injection moulding machine, with a first operating lever for extending and moving a first toggle mechanism, and with a second operating lever for extending and bending a second toggle mechanism, the double toggle mechanism comprising:
a gear mechanism between the first and second toggle mechanisms; the gear mechanism having a rotatably mounted gearbox, a drive shaft driven by a motor, and a driven output shaft arranged coaxially to said drive shaft; the first operating lever being connected in an articulated manner to said gearbox or a part attached thereto; and the second operating lever being connected in an articulated manner to a part fixed rigidly onto said driven output shaft. wherein the first and second toggle mechanism are each provided with two levers connected together in an articulated manner by means of a hinged joint, one of which levers is connected in an articulated manner to the movable die platen, and the other lever is connected in an articulated manner to a stationary end plate.