ReferencePushPullFeeder Cover tape spool problem

[Patricio]

Hi guys,

I have been testing for several days the Push-Pull Feeder and it works very well, with the exception of the cover tape spool winding mechanism.

Because the winding mechanism is always rotating at the same angular velocity, the tape cover film length per degree of rotation is greater as more film is wound in the spool. This is because the radius in increasing more and more, which means the tangential velocity is always increasing, hence the amount of wound film is dependent on the radius. After some feeds the mechanism is stuck and it's necessary to take out the cover tape spool, unwind the accumulated film and insert it back for continuing the process, which is not convenient.

Do you guys know a way of solving this problem? Maybe I'm missing something.

Thanks for your help.

Patricio

[mark maker]

> After some feeds the mechanism is stuck

What does "some feeds" mean in number of parts? How "full" is the spool at this time?

> and it's necessary to take out the cover tape spool, unwind the accumulated film and insert it back for continuing the process, which is not convenient.

Well that's expected, and I hoped to make it simple by a) making the feeder easily removable, b) the lock and spool easily removable, c) the removed spool half open, so you can quickly get the cover tape off sideways/without unspooling, d) make it easy to reassemble, e) make it easy to re-attach the cover tape with the C-shaped spool drum clamp.

But obviously it should only be necessary after the spool is well-filled, hence the questions above.

https://makr.zone/new-all-3d-printed-tapereel-feeder/399/

_Mark

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[Patricio]

Hi Mark,

Thanks for your reply.

I just tested it and the mechanism is stuck after feeding 24 parts (0402). 

BR,

[mark maker]

Well then something is obviously wrong. I tested for at least a thousand parts.

How exactly is it stuck? Can you video it?

_Mark

To view this discussion on the web visit https://groups.google.com/d/msgid/openpnp/cec154d2-b371-4829-b455-b0f675679602n%40googlegroups.com.

[Patricio]

Hi Mark, 

I'm making a video right now. I will upload it in a couple of minutes.

BR,

[Patricio]

Hi Mark,

Here is the video:

https://youtu.be/kgRoRR0AAZ4

BR

[ma...@makr.zone]

Hi Patricio ,

Nicely explained and documented.

So this means that the friction wheel has too much friction inside the drum, right?

Have you already tried to adjust the tension? See animation below.

Also, once assembled, I rotate the drum back-and-forth a bit to break it in.

[Patricio]

Hi Mark,

Thanks for your help. I will try your suggestion and let you know. After testing I will make another video so you can see the results.

BR,

[Balázs Kiss]

Hi all,

after ~15 feeders for varios parts, we can express, that the referencepushpullfeeder design is extraordinary. After several customizations on the model (including plays and angles, etc.) and some good rasping, we were able to achive a fluent pick process. My opinion is, that the base model has to be adopted to your 3d printer - it takes some effort.

Best regards,

Balázs