If you take a look at the first picture that you posted you will see how the mecahnism works:
Step 1: The mechanism will be as far back as it goes on that archemedic screw.
Step 2: The mechanism is pushed forward by this screw and in turn the arm is moved rightward thus forcing the screen outward of the opening.
Step 3: Once the arm goes beyond horizontal it forces the hinges to move to counter act the downward force of the arm and thusly the second smaller arm is forced into the upright position, creating a 'V' shape between the two arms and consequenctly the screen is folded upward.
It is just a case of pulleys and levers, although i really wouldn't reccommend a pulley!
Hope this helps!
I've done a lot of motorization. best advice I can give is, forget abot the motorization initially. before you can even think to motorize something, it must first at least be mechanically sound. you should devise tracks & pivots, get it to be stable & move through it's course of motion... then you can think about adding motorization... first you need it to slide out & pivot into position solidly, & then slide up & back in... it should do this & be solid, like a door or a drawer or a pivoting slide... then, motorization can be added...
motorization can be done with an actuator or a worm gear setup, but my favorite is to use a window or sunroof motor & use cables to operate. this allows a larger stronger motor to be remote mounted & just have to worry about the space for the cables. limit switches at either end of travel will insure that the parts don't get twisted up by the high torque of a motor like this... chances of you making your mechanical parts efficent enough to be able to use a tiny scanner motor are slim to none... you need to make everything solid & then you need a motor setup with enough power to get the job done solidly & reliably. limit switches will stop the motor on each end
set it up like you want it to be manual, once you get to that point, then you can add motorization...
Originally Posted by turbocad6
I was trying to think of what it was called for ages! I put Archemedic Screw which is similar but not the same! lol :lol: