Developing sections for digital printing presses, controllers and methods
AssigneeHP Indigo B.V.
InventorsUri Lidai, Shmuel Borenstain, Eyal Negreanu
Life of this patent
Estimating the term…
Abstract
A developing section for a digital printing press includes a controller to control a development unit such that a configuration of the development unit is to be in a first state or a second state based on a determination by the controller comparing a location of a portion of the surface of a photo imaging member presented to the development unit with a location of a transition between an image portion and a portion of the surface of the photo imaging member not in the image portion.
Claims15
A developing section for a digital printing press to apply an image to a web substrate, the developing section comprising:
- a photo imaging member;
- a development unit, to develop ink on the photo imaging member by applying ink to a surface of the photo imaging member that is presented to the development unit;
- and
- a controller to control the photo imaging member and the development unit, wherein
- the photo imaging member is to move relative to the development unit in a movement direction to present different portions of the surface of the photo imaging member for development by the development unit,
- the controller is to determine, based on an image to be developed, an image portion of the surface of the photo imaging member, the image portion corresponding with an extent, in the movement direction, of the image to be developed, and
- the controller is to control the development unit such that a configuration of the development unit is to be in a first state or a second state based on a determination by the controller comparing a location of the portion of the surface of the photo imaging member presented to the development unit with a location of a transition between the image portion and a portion of the surface of the photo imaging member not in the image portion and a circumference of the photo imaging member.
A controller for a digital printing press to apply an image to a web substrate, the controller comprising:
- outputs for control signals to a latent image bearing member and a developer unit, the latent image bearing member arranged to bear a latent image and the developer unit to apply ink to the latent image bearing member;
- and
- a processor to provide signals to the outputs to control the latent image bearing member and the developer unit, wherein
- the processor is to:
- determine a portion of the latent image bearing member carrying the latent image,
- provide signals to the outputs to cause the latent image bearing member and the developer unit to move relative to each other to vary a part of the latent image bearing member that may receive ink from the developer unit, and
- provide signals to the outputs to cause the development unit to change between a first configuration and a second configuration based on a determination by the controller of the relative positions of the part of the latent image bearing member that may receive ink from the developer unit and a change between the portion of the latent image bearing member carrying the latent image and a portion of the latent image bearing member that is not carrying the latent image;
- and
- provide signals to the outputs to cause the web substrate to reverse a distance determined based on the circumference of the latent image bearing member.
A method for applying an image to a web substrate, the method comprising:
- creating a latent image on a photo imaging member;
- moving the photo imaging member relative to a development unit to present different portions of the photo imaging member to the development unit;
- selectively applying, by the development unit, ink to the portion of the photo imaging member presented to the development unit;
- transferring the selectively applied ink to the web substrate;
- moving the web substrate in a first direction to form an image region and a non-image region corresponding to the ink selectively applied to the photo imaging member;
- subsequent to forming the image region and the non-image region, moving the web substrate in a second direction, opposite the first direction;
- and
- changing a state of the development unit based on relative locations of the portion of the photo imaging member presented to the development unit and a change to or from a portion bearing the latent image.
Dependencies are inferred from the claim text.