Anti-rotation device and method of use

A device for reducing rotation of an article comprising:

• a moveable lever arm comprising a torsion bar and a rotatable member rotatable about a first axis;
• and
• a revolving member coupled to the rotatable member and configured to revolve about a second axis parallel to the first axis;
• wherein:
• when the rotatable member is in a first position, an outer surface of the revolving member is in contact with a surface parallel to first axis and the second axis, and
• when the rotatable member is in a second position, the torsion bar applies a first force to the revolving member via the rotatable member, and an outer surface of the revolving member is in contact with, and applies a second force to, an article which is also in contact with the surface.

A system for singulating a stack of articles comprising:

• a lateral drive device positioned to receive a stack of articles from a conveyor such that, as the stack of articles moves toward and contacts the lateral drive device, the lateral drive device laterally accelerates an article in the stack of articles;
• and
• an anti-rotation device comprising a torsion bar, the anti-rotation device disposed proximate the lateral drive device such that the anti-rotation device is capable of contacting the lateral drive device, and is configured to provide a frictional force to a back face of the article, to thereby resist upward motion of the back face during lateral acceleration of the article;
• wherein, when the anti-rotation device is in a first configuration, the anti-rotation device is in contact with the lateral drive device,
• wherein, when the anti-rotation device is in a second configuration, the anti-rotation device is in contact with the back face of the article, and the front face of the article is in contact with the lateral drive device;
• and
• wherein the torsion bar is configured to resist motion of the anti-rotation device from the first configuration to the second configuration.