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  • Author Author: Former Member
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Color'er - update 3 : initial motorised design

Former Member

As mentioned here, here's what I am currently thinking doing.

image

- side 'back' wheels would drive in one direction

- side 'front' wheels would drive in the opposite direction

- side wheel would have to move towards the sharpie to produce the required friction to allows the 2 pieces to be move apart.

  • in reply to mcb1

    mcb1 wrote:

    I wonder if you could use the wheels as the grip part. If the centre of the wheel was offset they would try to grip the body and cap tighter. The alternative is to bring the wheel pair closer together either by moving together or a shear motion which makes them close the gap.  A simple linear motion would then pull the two portions apart.

    Indeed, in this approach wheels will be the 'grippers' and one (side) wheels set won't be motorised (i.e. free wheels).

    The problem with offset axle wheels is that they aren't really easy to find; I would probably have to make them. So a linear motion applied to one set of wheels will be more pragmatic. This might also offers more possibilities (e.g. moving the pen backward, putting the cap back on?).

     

    You've certainly generated some discussions on what we take for granted every day.

    Thanks! And if my participation in this challenge has, for whatever reason, to stop here, my personal goal has been reached! I.e. having people realise that simple acts we take for granted are sometime very difficult to impossible for disabled people.

  • Davis

    I wonder if you could use the wheels as the grip part.

    If the centre of the wheel was offset they would try to grip the body and cap tighter.

     

    The alternative is to bring the wheel pair closer together either by moving together or a shear motion which makes them close the gap.

     

    A simple linear motion would then pull the two portions apart.

     

     

    You've certainly generated some discussions on what we take for granted every day.

    Mark

  • I like all of your graphics.

    You might be able to get away with 2 spring-loaded free-wheeling rollers on one side and two drive wheels on the other.

    Ideally you feed the marker, cap first into one end, all motors going in the same direction. The drive wheel grabs the marker and feeds it through the machine.

    A microswitch at the cap end stops the marker motor, allowing the cap motor to continue and remove the cap, spitting it out the end.

    When the microswitch detects the cap is off, it allows the marker motor to continue until the marker is completely out.

    It may need an override button to stop the microswitch and eject the marker.

    typical microswitchimage