Here are some pictures and/or drawings of sharpeners from various makers. If the name of the submitter is underlined, you can go to the submitter’s web site. If you click on the picture of the sharpener, you will go to a page that will give more explanation of the sharpener.
If you use a grooved-sole plane, you only use 1/3 of the plane blade. So why sharpen the whole width every time? I relieve the edges of the blade with a grinder. Makes the sharpening go 3 times faster.