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US 6,267,518 B1Granted
Ink-jet printing apparatus and ink-jet printing method
AssigneeCanon Kabushiki Kaisha
InventorJunkichi Abe
Life of this patent
Estimating the term…
Abstract
A first printing unit for forming a front image on one surface and a second printing unit forming a back image on the other surface are respectively constructed with two stages of printing heads. With respect to the image formed on one surface of a printing medium by the first printing unit, the image formed on the other surface of the printing medium by the second printing unit is formed as a mirror image of bilateral symmetry about an axis in a transporting direction so that the image on the other surface is consistent with the image on one surface.
Claims13
An ink-jet printing apparatus for forming an image on a printing medium using a printing head, said apparatus comprising:
- transporting means for transporting the printing medium;
- first printing means, opposing one surface of the printing medium transported by said transporting means for forming an image on the one surface, at an image forming position, by applying a printing agent on the one surface of the printing medium using a printing head;
- second printing means, opposing the other surface of the printing medium, and provided on a transporting path rearward of the image forming portion of said first printing means, for forming an image on the other surface by applying a printing agent on the other surface of the printing medium using a printing head;
- and
- registration control means for registering at least the image formed on the other surface relative to the image formed on the one surface of the printing medium by said first printing means,
- wherein said first printing means includes:
- a carriage having printing heads with respect to a plurality of colors:
- scanning means for moving said carriage, on one surface of said printing medium, in a forward direction different from a transporting direction of said printing medium, wherein
- said first printing means drives said printing heads to form an image during movement of said carriage by said scanning means;
- and
- wherein said second printing means includes:
- a carriage having printing heads with respect to a plurality of colors;
- scanning means for moving said carriage, on one surface of said printing medium, in a forward direction different from a transporting direction of said printing medium;
- wherein said second printing means drives said printing heads to for an image during movement of said carriage by said scanning means;
- and
- wherein said registration control means includes means for registering an image position at least by said second printing means so that the position in said transporting direction is consistent with the position in said forward direction.
13 more elements
An ink-jet printing method comprising:
- transporting step of transporting a printing medium;
- image on one surface forming step of forming an image on one surface by applying a printing agent on the one surface of the printing medium transported in said transporting step at an image forming portion, using first printing means opposing one surface of the printing medium;
- image on the other surface forming step of forming an image on the other surface of the printing medium by applying a printing agent on the other surface of the printing medium using second printing means opposing the other surface of the printing medium,
- wherein the second printing means is provided on a transporting path rearward of the image forming portion in said image on one surface forming step;
- registration step of registering at least the image on the other surface of the printing medium relative to the image formed on the one surface of the printing medium by the first printing means,
- wherein said image on one surface forming step includes the step of:
- moving said carriage having printing heads with respect to a plurality of colors, on one surface of said printing medium, in a forward direction different from a transporting direction of said printing medium to form an image;
- wherein said image on the other surface forming step includes the step of:
- moving said carriage having printing heads with respect to a plurality of colors, on one surface of said printing medium, in a forward direction different from a transporting direction by said printing medium to form an image;
- and
- wherein said registration step includes the step of:
- registering an image position at least by said second printing means so that the position in said transporting direction is consistent with the position in said forward direction.
9 more elements
Dependencies are inferred from the claim text.