Automotive Single actuator Wiper design to wipe a surface area

AI Thread Summary
The discussion focuses on designing a single actuator wiper mechanism to cover a specified surface area effectively. The user has experimented with the Mercedes Mono Wiper mechanism but achieved only 41% coverage and seeks alternative ideas. They are exploring linkage mechanisms, particularly crank-rocker 4-bar linkages, to enhance coverage. The proposed solution involves breaking down the movement into horizontal and vertical motions, utilizing a rotating traverse roll for left-right movement and a Whitworth quick return mechanism for up-down movement. The user is looking for assistance in linking the actuator to the rotating mechanism to achieve comprehensive wiper coverage.
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I'm given this problem to solve with the assumption as stated above. The answers need not be logical as long as the linkage mechanism can be simulated. I've attempted the question using Mercedes Mono Wiper mechanism but only manage to cover 41% given the width of the wiper. May I ask if there are any ideas or reference for me to look into to cover as much of the area as possible while satisfying all the criteria?

Area of parallelogram surface area=1,600,000 mm2
Area of covered area assume swiping half circle=663,747 mm2

Reference used:
 
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jack action said:
Study linkages, especially crank-rocker 4-bar linkages.
Thank you for pointing towards the direction. I'm currently looking into the linkage mechanism in the link given and will post back once I figure the connection out. :smile:
 
jack action said:
Study linkages, especially crank-rocker 4-bar linkages.

I broke down the question into 2 parts which is moving the wiper platform left and right+moving the wiper platform up and down. So like a bouncing DVD logo we see on TV, eventually it will travel through all possible locations on the screen.
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To move the wiper left and right

1. The actuator will produce a rotation motion along x axis.
2. The rotating Traverse Roll will move the platform left and right.
Reference:

Now we need to move the wiper up and down.

3. Using the Whitworth quick return mechanism to produce a left to right movement.
5jRT1cl.png

4. The left right movement produced will operate and move the wiper attached to the scissors table up and down.
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I've made a crude sketch of what I have came up with. However I have a problem linking the rotating circle to the actuator.
Things I considered are
1) belt (not possible because the platform is moving from left to right constantly)
2) rack and pinion (the movements of the wiper is constant this way and will not be able to cover the whole wiper surface.)
My concept of this would be to operate like a bouncing ball in a box. Eventually the ball will cover all the possible spots on the screen.

Need help connecting from the actuator to making the circle on a left right moving platform rotate. Thank you
 

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