Displaing list of node, no 'read more' link appears.

Hi all,
i've created a views of nodes (with a page display); style is 'unformatted', row style is 'node' and his settings are 'teaser' with 'display link' checked.
The view filters all nodes of a type of content.

The problem is that i can see no 'read more' link.

The type of content has no body but much fields (text-area fields). Most of them are excluded in 'view field' - 'teaser' settings.
If i changes the not excluded ones from 'default' to 'trimmed' or 'normal text' nothing change.

What i can do?
Thanks in advance.
Edubacco