Full force web severer
AssigneeHeidelberger Druckmaschinen AG
InventorDavid Charles Burke
Life of this patent
Estimating the term…
Abstract
A first given pressure is provided to a first side of an air pressure cylinder that in turn drives a cutting member under the influence of the first given pressure. A second given pressure is provided to a second side of the air pressure cylinder that is greater than the first given pressure during a non-cutting state of the air cylinder. The cutting member remains stationary as long as the second given pressure is greater than the first given pressure. To transition to a cutting state, the second given pressure is rapidly reduced to a value below the first given pressure value during a cutting state of the air pressure cylinder for moving the cutting member to cut a web.
Claims14
A method for severing a web, which comprises:
- a) providing a first given air pressure during a non-cutting state to a first side of an air pressure cylinder for driving a cutting member under full force towards the web during a cutting state;
- b) providing a second given air pressure to a second side of the air pressure cylinder that is greater than the first given air pressure during the non-cutting state of the air cylinder, the cutting member remaining stationary as long as the second given air pressure being greater than the first given air pressure;
- and
- c) reducing rapidly the second given air pressure to below the first given air pressure during the cutting state of the air pressure cylinder causing movement of the cutting member to sever a web.
A method for severing a web, which comprises:
- a) providing a first given air pressure during a non-cutting state to a first side of an air pressure cylinder for driving a cutting member under full force towards the web during a cutting state;
- b) providing a second given air pressure to a second side of the air pressure cylinder that is greater than the first given air pressure during the non-cutting state of the air cylinder, the cutting member remaining stationary as long as the second given air pressure being greater than the first given air pressure;
- c) reducing rapidly the second given air pressure to below the first given air pressure by opening a quick exhaust valve during the cutting state of the air pressure cylinder causing movement of the cutting member;
- and
- d) providing a control unit controlling the quick exhaust valve and thereby controlling the transitioning between the non-cutting state and the cutting state.
Dependencies are inferred from the claim text.