Mechanisms Exploration

Rotary Into Rectilinear Motion

In exploring the various models that convert rotary motion into linear motion, I found that this model (Model 042) to be the most intriguing. (Model 046 came a close second.)

I found this model the most interesting. One would think I would be attracted to the many shiny examples of gears or ratchet wheels. Let us not forget the Multiple Straight Line Drive. This mechanism fascinates me because of the design's incredible level of simplicity and ability to create complicated movement.

In the video, the top model consists of two studs on a rotating disk. As they rotate, they strike an elbow-shaped lever, which moves the entire linear apparatus one way, and then the studs strike the plate on the other end to pull the entire apparatus in the opposite direction. One can vary the speed of this back-and-forth movement by varying the radius of the disk (or the interval between the first stud's hit and the next stud's hit). 

The lower model consists of asymmetrical opening in which a three-pronged disk rotates to hit the bottom and top steps of the opening. I was truly amazed at the person who thought of this design: very simple and still effective. Like the model above it, it utilizes the idea of multiple hits at different points to make a back-and-forth movement. The difference with the lower example is that it utilizes 3 "studs," which increases the speed of the linear motion.

Such an mechanism could be well-fitted for machines that need to "pin in" and "pin out" based on the rate at which the products are placed in front of the machine, i.e. a piston, a newspaper press, a machine used to press the bristles on a toothbrush plate.
Regardless of the discrepancies in the designs, they both work wonderfully. Additionally, they are similar to the "Back and Forth" Lego motion model. Two studs hit the linear apparatus at different points to send it back and forth. However, this module slightly differs in that the studs are not connected to one rotating disk but, rather, a dual conveyor belt system.


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