Image forming apparatus
View Patent ↗An image forming apparatus includes a transport member that transports a recording medium, an image carrier that carries a toner image, a transfer member that transfers the toner image onto the recording medium, a fixing device that fixes the toner image, a reversing path that reverses the recording medium, and a controller. When the toner image is a borderless image and there is a burr on an edge portion of the recording medium, the controller controls the transport member, the image carrier, and the transfer member so that the recording medium passes between the image carrier and the transfer member and through the fixing device without the toner image being transferred onto the recording medium, and then the recording medium is transported along the reversing path to between the image carrier and the transfer member and the toner image is transferred onto the recording medium.
1. An image forming apparatus comprising:
a transport member that transports a recording medium;
an image carrier that rotates while carrying a toner image on a surface thereof;
a transfer member that transfers the toner image carried by the image carrier onto the recording medium by causing the recording medium, which is transported by the transport member, to pass between the transfer member and the image carrier while the transfer member is in contact with the image carrier so as to be rotated by the image carrier;
a fixing device that is disposed downstream of the image carrier in a transport direction of the recording medium and that fixes the toner image to the recording medium by nipping the recording medium onto which the toner image has been transferred;
a reversing path that reverses front and back sides of the recording medium that has passed between the image carrier and the transfer member and through the fixing device and then guides the recording medium to between the image carrier and the transfer member; and
a controller that, when the toner image to be transferred onto the recording medium is a borderless image and there is a burr on an edge portion of the recording medium, controls the transport member, the image carrier, and the transfer member so that the recording medium passes between the image carrier and the transfer member and through the fixing device without the toner image being transferred onto the recording medium, and then the recording medium is transported along the reversing path to between the image carrier and the transfer member and the toner image is transferred onto the recording medium.
2. The image forming apparatus according to claim 1 ,
wherein, when the toner image to be transferred onto the recording medium is a borderless image and there is a burr on an edge portion of the recording medium, the controller controls the transport member so as to set a preliminary transport speed at which the recording medium is transported before the toner image is transferred onto the recording medium to a speed higher than a transferring transport speed at which the recording medium is transported when the toner image is transferred onto the recording medium.
3. The image forming apparatus according to claim 1 , further comprising:
a position changing unit that changes a transport position of the recording medium in a width direction of the recording medium, the width direction being substantially orthogonal to the transport direction of the recording medium,
wherein, when the toner image to be transferred onto the recording medium is a borderless image and there is a burr on an edge portion of the recording medium, the controller controls the position changing unit so as to change a preliminary transport position for a preliminary transporting process in which the recording medium is transported before the toner image is transferred onto the recording medium from a transferring transport position for when the toner image is transferred onto the recording medium.
4. The image forming apparatus according to claim 2 , further comprising:
a position changing unit that changes a transport position of the recording medium in a width direction of the recording medium, the width direction being substantially orthogonal to the transport direction of the recording medium,
wherein, when the toner image to be transferred onto the recording medium is a borderless image and there is a burr on an edge portion of the recording medium, the controller controls the position changing unit so as to change a preliminary transport position for a preliminary transporting process in which the recording medium is transported before the toner image is transferred onto the recording medium from a transferring transport position for when the toner image is transferred onto the recording medium.
5. The image forming apparatus according to claim 1 ,
wherein, when the toner image to be transferred onto the recording medium is a borderless image and there is a burr on an edge portion of the recording medium, the controller controls at least one of the image carrier and the transfer member to set a borderless-printing transferring condition for transferring the toner image onto the recording medium to be the same as a back-surface transferring condition for transferring the toner image on a back surface of the recording medium in duplex printing.
6. The image forming apparatus according to claim 2 ,
wherein, when the toner image to be transferred onto the recording medium is a borderless image and there is a burr on an edge portion of the recording medium, the controller controls at least one of the image carrier and the transfer member to set a borderless-printing transferring condition for transferring the toner image onto the recording medium to be the same as a back-surface transferring condition for transferring the toner image on a back surface of the recording medium in duplex printing.
7. The image forming apparatus according to claim 3 ,
wherein, when the toner image to be transferred onto the recording medium is a borderless image and there is a burr on an edge portion of the recording medium, the controller controls at least one of the image carrier and the transfer member to set a borderless-printing transferring condition for transferring the toner image onto the recording medium to be the same as a back-surface transferring condition for transferring the toner image on a back surface of the recording medium in duplex printing.
8. The image forming apparatus according to claim 4 ,
wherein, when the toner image to be transferred onto the recording medium is a borderless image and there is a burr on an edge portion of the recording medium, the controller controls at least one of the image carrier and the transfer member to set a borderless-printing transferring condition for transferring the toner image onto the recording medium to be the same as a back-surface transferring condition for transferring the toner image on a back surface of the recording medium in duplex printing.