Single actuator Wiper design to wipe a surface area

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Discussion Overview

The discussion revolves around designing a single actuator wiper mechanism to effectively cover a specified surface area. Participants explore various linkage mechanisms and their configurations to maximize the area wiped while addressing the constraints of the problem.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant mentions using the Mercedes Mono Wiper mechanism but only achieves 41% coverage of the area, seeking alternative ideas or references to improve this.
  • Another participant suggests studying crank-rocker 4-bar linkages as a potential solution for the wiper design.
  • A participant describes breaking down the problem into two parts: horizontal and vertical movement of the wiper platform, likening it to a bouncing DVD logo that eventually covers all areas.
  • The proposed mechanism involves using a rotating actuator to move the wiper platform left and right, and a Whitworth quick return mechanism for vertical movement.
  • Challenges are noted in linking the rotating motion to the actuator, with considerations of using a belt or rack and pinion, both of which are deemed unsuitable for the desired movement.

Areas of Agreement / Disagreement

Participants express various ideas and approaches, but no consensus is reached on a specific solution or mechanism. Multiple competing views on linkage mechanisms and their configurations remain present.

Contextual Notes

Participants acknowledge limitations in their proposed mechanisms, including the need for effective connections between components and the challenges posed by the constant left-right movement of the platform.

Brlala
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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.
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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