Electrostatic printing apparatus and method
AssigneeDelphax Systems
InventorsAndrzej Maczuszenko, Ernest Davison, Brian Otter, Brian F. Whittaker, Christopher Novak, Dolf Landheer
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Abstract
This invention provides an electrostatic printing apparatus comprising a rotatable electrostatically chargeable drum and ion deposition means for forming an electrostatic image on the electrostatically chargeable drum, the improvement comprising means for discharging a flow of air along the path of flow extending between the periphery of the electrostatically chargeable drum and the ion discharge means.
Claims10
In an electrostatic printing apparatus comprising a rotatable electrostatically chargeable printing drum and ion deposition means for forming an electrostatic image on said electrostatically chargeable drum, the improvement comprising:
- means for discharging a flow of air along a path of flow extending between the periphery of said electrostatically chargeable drum and said ion deposition means,
- said air flow discharge means being oriented to discharge the air flow in a direction opposite to the direction of rotation of said electrostatically chargeable drum;
- means forming an enclosure around a portion of the periphery of said electrostatically chargeable drum, and including the air flow path;
- said air flow discharge means including means defining outlets for discharging said air into the flow path and means conforming to the periphery of said electrostatically chargeable drum and forming with said drum periphery a constriction through which air passes in leaving the flow path.
An electrostatic printing apparatus, comprising:
- a rotatable electrostatically chargeable cylinder and arranged in succession around said electrostatically chargeable cylinder in the direction of rotation thereof:
- ion deposition means for forming an electrostatic image on said electrostatically chargeable cylinder;
- means for applying a toner powder to said electrostatic image to form a toner image on the periphery of said electrostatically chargeable cylinder;
- means for transferring said toner image from said electrostatically chargeable cylinder to a copy material and fusing said toner image to said copy material;
- means for removing residual toner powder from the periphery of said electrostatically chargeable cylinder, and;
- means for erasing said electrostatic image;
- said ion deposition means and said erase means being spaced from the periphery of said electrostatically chargeable cylinder by an air flow path extending around a portion of the periphery of said electrostatically chargeable cylinder;
- and
- air flow discharge means for providing a flow of air generally tangentially of said cylinder portion periphery along said air flow path,
- said air flow discharge means being oriented to discharge the air flow in a direction opposite to the direction of rotation of said electrostatically chargeable drum;
- and
- means forming an enclosure around a portion of the periphery of said electrostatically chargeable drum, and including the air flow path;
- said air flow discharge means including means defining outlets for discharging said air into the flow path and means conforming to the periphery of said electrostatically chargeable drum and forming with said drum periphery a constriction through which air passes in leaving the flow path.
In an electrostatic printing apparatus including an electrostatically chargeable cylinder and ion deposition means for forming an electrostatic image on said drum;
- the improvement comprising:
- means for readily releasably supporting said ion deposition means in position relative to the periphery of said electrostatically chargeable cylinder;
- and
- means for adjusting the position of said support means and therewith said ion deposition means relative to said cylinder periphery.
Dependencies are inferred from the claim text.