Stabilized high flow doctor blade head for transfer roller
AssigneeHarris & Bruno Machine Co., Inc.
InventorsTHOMAS JAMES RIGA, JR., Aaron Stephen Fieguth, Danny Richard Gubbels
Life of this patent
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Abstract
A doctor blade head for coating a transfer roller includes a semi-cylindrical cavity to enable streamline fluid flow therethrough, and check plates at the inlet and outlet openings for permitting unidirectional flow into the inlet opening from said pump and out of the outlet opening toward the pump. An hydraulic accumulator acts as a fluid pressure and fluid velocity balancing device, and includes a rolling diaphragm piston moving in a cylinder that is connected to the inlet fluid path, with a spring impinging on the piston to absorb pressure surges and compensate pressure dropoffs.
Claims20
In a chambered doctor blade assembly having a longitudinally extending cavity containing a coating fluid and a pair of parallel doctor blades extending to contact the cylindrical surface of a transfer roller and seal the cavity to the transfer roller, and a pump for circulating coating fluid to and from the cavity, the improvement comprising:
- hydraulic accumulator means connected between an output of the pump and an inlet opening extending into the cavity for attenuating fluctuations in fluid pressure from the pump.
In a chambered doctor blade assembly having a longitudinally extending cavity containing a coating fluid and a pair of parallel doctor blades extending to contact the cylindrical surface of a transfer roller and seal the cavity to the transfer roller, and a pump for circulating coating fluid to and from the cavity, the improvement comprising:
- an inlet opening extending into the cavity and connected to an output of the pump, and inlet check plate means interposed between the pump output and the inlet opening for permitting fluid to flow from the pump output into the cavity but block fluid flow from the cavity retrograde toward the pump output.
In a chambered doctor blade assembly having a longitudinally extending cavity containing a coating fluid and a pair of parallel doctor blades extending to contact the cylindrical surface of a transfer roller and seal the cavity to the transfer roller, and a pump for circulating coating fluid to and from the cavity, the improvement comprising:
- an inlet opening extending into the cavity and connected to an output of the pump,
- an outlet opening extending into the cavity and disposed in longitudinally opposite ends to said inlet opening,
- said cavity having a semi-cylindrical conformation in said longitudinal direction to enable streamline fluid flow therealong.
Dependencies are inferred from the claim text.