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US 7,014,185 B2Granted
Spring-action suction head
AssigneeHeidelberger Druckmaschinen AG
InventorsMichael Östreicher, Jochen Renner
Life of this patent
Estimating the term…
Abstract
In a spring-action suction head for separating sheets from a sheet stack, a first suction chamber, which can be subjected to vacuum is provided for lifting the sheet. The first suction chamber is surrounded coaxially by a second suction chamber, which can be subjected to vacuum, for holding and lowering the spring-action suction head in a controlled manner.
Claims23
A spring-action suction head, comprising:
- a lifting cylinder;
- a first suction chamber having a volume being varied by applying a vacuum, said first suction chamber being operatively connected to said lifting cylinder for lifting said lifting cylinder from a first position to a second position;
- a second suction chamber coaxially surrounding said first suction chamber and operatively connected to said lifting cylinder for holding said lifting cylinder in the second position;
- and
- a cross-flow channel having a closeable connection to ambient surroundings being operatively connected to said second suction chamber such that when said lifting cylinder is released from being held in the second position, a lowering speed of said lifting cylinder is reduced during movement of said lifting cylinder from the second position to the first position.
2 more elements
A spring-action suction head, comprising:
- a lifting cylinder;
- a housing supporting said lifting cylinder, said housing defining a first suction chamber having a volume being varied by applying a vacuum, said first suction chamber being operatively connected to said lifting cylinder for lifting said lifting cylinder from a first position to a second position, a second suction chamber coaxially surrounding said first suction chamber and operatively connected to said lifting cylinder for holding said lifting cylinder in the second position, and a closeable cross-flow channel having a connection to ambient surroundings and being operatively connected to said second suction chamber such that when said lifting cylinder is released from being held in the second position, a lowering speed of said lifting cylinder is reduced during movement of said lifting cylinder from the second position to the first position.
Dependencies are inferred from the claim text.