is this four bar linkage possible? 1

[bpp88]

hello!
I am want to design a four bar mechanism but I don't know if it is possible.
A motor moves the Input bar with the objective of making the output bar rotate 160º. Initially i wanted to make the output bar rotate 180 degress but i realized that it is impossible to do it without going through a blocking position (obviously), i think this position is call dead centre position in english ("posicion de bloqueo" in spanish)
The main idea is to begin in a position of maximum mechanical advantage (where the input link and the coupler link are aligned) and then activate the motor in order to move the output link 160 degrees. The mechanism has to be able to return to its initial position by chaing the direction of the motor rotation.
therefore, the conditions are the following:
- the mechanism should not pass through dead centre positions
- in the initial position, the mechanism has to be in (or close to) the maximum mechanical advantage position (input and coupler links aligned)
- the output bar has to rotate 160 degrees.
Is that even possible?
I've studied the different possibilites and I think that the only way of making this is with the Grashof "Crank-Rocker" mechanism where the crank is the input link. this way the motor rotates in one direction and there are no dead centre positions. but in this case i think it is impossible to make the rocker rotate 160 º....

thank you very much.

sorry for my english. If you don't understand something, pless ask. thanks again

 

[MotionGirl]

In answer to zekeman, if I put it in to a 'cambox' where the OP could only see the input and output shaft, then he would never really know he had a 6 bar! I could be really sneaky and just tell him/her to never, ever, on the pain of death, open the box!!!!

 

[zekeman]

Kinematically, speaking, you have a solution, but maybe not a design.

Only the OP has to decide. That's when your "black box" must be opened for inspection.