Pre-stretch web dispenser
Assignee1137508 Ontario Ltd.
InventorLaurie Robert Mackie
Life of this patent
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Abstract
A pre-stretch wrapping device consisting of a base, a pre-stretch station, a vertical drive, and a rotatable load causes a pre-stretched web to become wrapped around the load under controlled tension. The pre-stretch station comprises a pair of pre-stretch rollers located on a pivotal frame, a spring which opposes the pivotal movement of the frame relative to the base, a roller motor, and a sensor located between the frame and the base. The sensor monitors relative movement of the frame from the base and a controller in response to signals from the sensor controls the operation of the roller motor.
Claims12
A web dispenser for dispensing a web of flexible packaging material;
- said dispenser comprising a base, a holder to support a roll of said packaging material and permit it to be dispensed as a continuous web therefrom, a pre-stretch station to elongate said web and deliver it to a load to be wrapped;
- said pre-stretch station comprising a frame, at least one roller mounted on said frame, a drive mechanism to rotate said roller, and a sensor responsive to displacement of said roller relative to said base due to variations in load applied by said web to said roller;
- and a control system controlling the operation of said drive in response to signals received from said sensor to retain said web tension at a predetermined set value.
Dependencies are inferred from the claim text.