Patent ID: 7905130

Claim:
A threading head, comprising: a first threading roller with a threaded surface; a second threading roller with a threaded surface; a first cam roller; a second cam roller; a first cam with a first cam surface, the first cam being configured so that movement of the first cam roller in one direction along the first cam surface pushes the first cam roller to thereby push the first threading roller toward the second threading roller; and a second cam with a second cam surface, the second cam being configured so that movement of the second cam roller in one direction along the second cam surface pushes the second cam roller to thereby push the second threading roller toward the first threading roller, wherein the threading head is configured to impart a thread onto a cylindrical container such that a threaded cap may be screwed onto the container to seal an opening in the container, wherein a rotational axis of the first cam roller is perpendicular to a rotational axis of the first threading roller.