IMAGE FORMING APPARATUS
First Claim
1. An image forming apparatus, comprising:
- an image forming device to form a toner image;
a transfer device comprising;
an intermediate transfer member having a surface to bear the toner image formed in the image forming device;
a nip forming member to press against the intermediate transfer member to form a transfer nip between the intermediate transfer member and the nip forming member; and
an electric potential difference generator to generate an electric potential difference between the intermediate transfer member and the nip forming member,the transfer device transferring the toner image on the surface of the intermediate transfer member onto a recording sheet clamped in the transfer nip in a state in which the electric potential difference generator generates the electric potential difference between the intermediate transfer member and the nip forming member;
a fixing device to fix the toner image on the recording sheet after the recording sheet is passed through the transfer nip;
an inverting device to invert the recording sheet after the toner image is transferred and fixed onto a first side of the recording sheet upon passing through the transfer nip and the fixing device and to then transport the recording sheet to the transfer nip again; and
a processor to cause the electric potential difference generator to generate a first electric potential difference containing only a direct current (DC) component when the toner image is transferred onto the first side of the recording sheet, and to generate a second electric potential difference containing a DC component and a superimposed alternating current (AC) component when the toner image is transferred onto a second side of the recording sheet,wherein the second electric potential difference has an averaged absolute value per unit of time smaller than an absolute value of the first electric potential difference.
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Accused Products
Abstract
An image forming apparatus including an image forming device, a transfer device, a fixing device, an inverting device, and a processor. The transfer device includes an intermediate transfer member, a nip forming member, and an electric potential difference generator to generate an electric potential difference between the intermediate transfer member and the nip forming member. The processor causes the electric potential difference generator to generate a first electric potential difference containing only a DC component when a toner image is transferred onto a first side of a recording sheet, and to generate a second electric potential difference containing a DC component and a superimposed AC component when the toner image is transferred onto a second side of the recording sheet. The second electric potential difference has an averaged absolute value per unit of time smaller than an absolute value of the first electric potential difference.
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Citations
20 Claims
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1. An image forming apparatus, comprising:
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an image forming device to form a toner image; a transfer device comprising; an intermediate transfer member having a surface to bear the toner image formed in the image forming device; a nip forming member to press against the intermediate transfer member to form a transfer nip between the intermediate transfer member and the nip forming member; and an electric potential difference generator to generate an electric potential difference between the intermediate transfer member and the nip forming member, the transfer device transferring the toner image on the surface of the intermediate transfer member onto a recording sheet clamped in the transfer nip in a state in which the electric potential difference generator generates the electric potential difference between the intermediate transfer member and the nip forming member; a fixing device to fix the toner image on the recording sheet after the recording sheet is passed through the transfer nip; an inverting device to invert the recording sheet after the toner image is transferred and fixed onto a first side of the recording sheet upon passing through the transfer nip and the fixing device and to then transport the recording sheet to the transfer nip again; and a processor to cause the electric potential difference generator to generate a first electric potential difference containing only a direct current (DC) component when the toner image is transferred onto the first side of the recording sheet, and to generate a second electric potential difference containing a DC component and a superimposed alternating current (AC) component when the toner image is transferred onto a second side of the recording sheet, wherein the second electric potential difference has an averaged absolute value per unit of time smaller than an absolute value of the first electric potential difference. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image forming apparatus, comprising:
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an image forming device to form a toner image; a transfer device comprising; an intermediate transfer member having a surface to bear the toner image formed in the image forming device; a nip forming member to press against the intermediate transfer member to form a transfer nip between the intermediate transfer member and the nip forming member; and an electric potential difference generator to generate an electric potential difference between the intermediate transfer member and the nip forming member, the transfer device transferring the toner image on the surface of the intermediate transfer member to the recording sheet clamped in the transfer nip in a state in which the electric potential difference generator generates the electric potential difference between the intermediate transfer member and the nip forming member; a fixing device to fix the toner image on the recording sheet after the recording sheet is passed through the transfer nip; an inverting device to invert the recording sheet after the toner image is transferred and fixed onto a first side of the recording sheet upon passing through the transfer nip and the fixing device and to then transport the recording sheet to the transfer nip again; and a processor to cause the electric potential difference generator to generate a first electric potential difference containing only a direct current (DC) component when the toner image is transferred onto the first side of the recording sheet, and a second electric potential difference containing either a DC component alone or a superimposed component in which an AC component is superimposed on a DC component when the toner image is transferred onto a second side of the recording sheet, the processor selectively switching the electric potential difference generator between a second DC electric potential difference containing the DC component alone and a second superimposed electric potential difference containing the superimposed component in which the AC component is superimposed on the DC component, as the second electric potential difference, wherein the second superimposed electric potential difference has an averaged absolute value per unit of time smaller than an absolute value of the first electric potential difference. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An image forming apparatus, comprising:
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an image forming carrier having a surface to form and bear a toner image; an electric potential difference generator generate an electric potential difference; a transfer member to press against the image forming carrier to form a transfer nip between the image forming carrier and the transfer member and transfer the toner image on the surface of the image forming carrier to a recording sheet clamped in the transfer nip in a state in which the electric potential difference generator generates the electric potential difference between the image forming carrier and the transfer member; a fixing device to fix the toner image on the recording sheet after the recording sheet is passed through the transfer nip; an inverting device to invert the recording sheet after the toner image is transferred and fixed onto a first side of the recording sheet upon passing through the transfer nip and the fixing device and to then transport the recording sheet to the transfer nip again; and a processor to cause the electric potential difference generator to generate a first electric potential difference containing only a direct current (DC) component when the toner image is transferred onto the first side of the recording sheet, and to generate a second electric potential difference containing a DC component and a superimposed alternating current (AC) component when the toner image is transferred onto a second side of the recording sheet, wherein the second electric potential difference has an averaged absolute value per unit of time smaller than an absolute value of the first electric potential difference. - View Dependent Claims (18, 19, 20)
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Specification