Rockwell Automation Motion Analyzer Software - Manual (Page 102)

102 Rockwell Automation Publication MOTION-UM004B-EN-P - October 2012
Chapter 2 Sizing Your System
2.1.4.3. Cutter Knife Drive
This application is typically cutting strip material such as steel into pre-set lengths
by means of a rotary knife (heavy-duty knife blades mounted on a pair of rotating
drums). The blades must be stationary relative to the material (for example,
moving at line speed) when the cut is made and the cut takes place over a fixed
drum angle.
Strip material is unwound from a reel at constant surface speed and fed via
separately driven leveler rolls. After the cut is complete, the drum is adjusted
forward or backward relative to the material in order to cut the required length. It
must return to line speed at the position required to cut the required length of
material.
When the cut-length is equal to the circumference of the locus of the knife blade
tip, it is said to be the synchronous cut length. In this special case, the knife drums
rotate at a steady speed.
Figure 82 - Cutter Knife Drive Template