Patent Number: 6,253,652

Title: Slitter blade locking device

Abstract: In a web slitter of the type used for cutting continuous webs of material, such as paper, a top slitter assembly features a hub cylinder attached to its frame. The hub cylinder supports a freely rotating hub to which the top blade of the web slitter is mounted. The hub cylinder may be raised and lowered with respect to the slitter frame so that the top blade may be lowered to, and raised from, its cutting position. A toggle support is clamped to the hub cylinder while a pin holder is attached to the slitter frame. A toggle is attached to the toggle support in a pivoting fashion. Housed within the pin holder is a sliding pin and a compression spring. The compression spring resists the movement of the pin towards the hub of the web slitter. The pin may be extended so that it engages a notch in the hub. When the hub cylinder is raised, the toggle may be pivoted so that it abuts the end of the engaged pin against the action of the compression spring. As a result, the pin is maintained in engagement with the hub. This causes the hub, and thus the blade, of the slitter to be locked against rotation. An operator may pivot the toggle back to its original position to unlock the hub and blade. If the blade is lowered into the cutting position with the pin still engaged, the toggle is pulled off of the pin so that the blade is automatically unlocked.

Inventors: Dax; James (New London, WI), Knutson; Jeffrey (Neenah, WI)

Assignee: Valmet Corporation

International Classification: B26D 7/26 (20060101); B26D 001/14 ()

Expiration Date: 07/03/2018