Safety Chucks do three things:
1. They provide for a quick change at the end of a production run (either winding or unwinding). Therefore, there is less down time during turn around and the more cost effective in operation.
2 .They provide a means of transmitting torque to the roll being wound / unwound. Torque in the form of a drive on the rewind end of the operation and torque from a brake on the unwind side.
3. Finally, Safety Chucks provide for concentricity between centreline, or axis, of the Safety Chuck and the center line of the Air Shaft. Less eccentricity between the Air Shaft and Safety Chuck results in less vibration and wear.
Safety Chucks Introduction:
A safety chuck is a specialized quick coupling used for web handling operations. In order to maintain the expected tension in a web, a shaft from which a roll is being unwound must be subject to a constant level of torque from a tension brake. Similarly, a shaft onto which a roll is being wound must be subject to a constant level of torque from a motor through a slip / tension clutch. A safety chuck provides a means to transmit torque to a roll shaft as well as the ability to switch the roll shafts quickly and conveniently. Unlike most couplings, a safety chuck does not require loosening and tightening of screws or moving any component other than the shaft and the chuck itself. Tension clutches, brakes, and motors need not be moved or dismounted.
