Just to expand on what RW said..
That is not a crusher. It is an apple mill. Note the teeth on the drum. While this is great for reducing apples to a pile of pulp (for easy juice extraction), this is not how you would want to process grapes.
A grape crusher gently squeezes the grapes between two smooth rollers. This is to just break the skins and not to grind them up. Milling grapes would result in a wine being WAY too tannic and bitter.