Jumbo pins do not fit

Since my daughters paint a lot with crayons, I bought this pencil sharpener a brand manufacturer at Rossmann for only 2.79 € instead of here much higher price.
But the 2.79 I could give me, because first conventional jumbo pins do not fit (no brand) because the large Anspitzöffnung is too small.
Secondly, the blade of the second smaller Anspitzöffnung was also very quickly blurred. This thereabouts after 3 months of use. Much was not so pointed as my daughters do not ever feel like it :-)
Too bad, then I can continue to buy the cheap.
Visually, it looks high quality, the emptying by pressing on the sides was promising, as this will not be as easily rose to the children.
Would I buy under any circumstances again.
In the stationery store my neighbor I then found it.