Image Number 5 for United States Patent #6883955.
An improved method of detecting the height of, and clamping, a paint or other liquid-containing can relies upon a subtractive comparison of a current draw of a clamping motor to a baseline reference current draw in order to detect the can height. Because the baseline reference current draw accounts for anomalous current draw readings, periodic manual adjustment of the current draw level considered to indicate a can height is unnecessary. The method further includes advanced detection and elimination of gaps developing between the can and the clamping apparatus. A system for agitating a liquid-containing can includes apparatus to carry out can-height detection, clamping, and gap detection and correction using current draw, can height, and clamping plate position data.