Transfer nip roller, transfer device, and image forming apparatus
First Claim
Patent Images
1. A transfer nip roller operative to transfer an image from an image carrier to a recording medium, the transfer nip roller comprising:
- a core connected to an electrical ground;
a covering portion that covers a surface of the core and includes an elastic layer on a surface of the core and a surface layer on the elastic layer, wherein the covering portion is configured such thata 3-30 elastic ratio (We3/Wt3)/(We30/Wt30) of the covering portion is 0.47 or more, where We3 is an elastic workload and Wt3 is a total workload measured by applying a load on the covering portion under a load push-in condition of 3 mN/10 seconds, and We30 is an elastic workload and Wt30 is a total workload measured by applying a load on the covering portion under a load push-in condition of 30 mN/10 seconds.
1 Assignment
0 Petitions
Accused Products
Abstract
In a transfer nip roller operative to transfer an image from an image carrier to a recording medium, a ratio (We3/Wt3)/(We30/Wt30) is 0.47 or more, where We3 is an elastic workload and Wt3 is a total workload measured by applying a load on a covering portion under a load push-in condition of 3 mN/10 seconds, and We30 is an elastic workload and Wt30 is a total workload measured by applying a load on the covering portion under a load push-in condition of 30 mN/10 seconds.
21 Citations
20 Claims
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1. A transfer nip roller operative to transfer an image from an image carrier to a recording medium, the transfer nip roller comprising:
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a core connected to an electrical ground; a covering portion that covers a surface of the core and includes an elastic layer on a surface of the core and a surface layer on the elastic layer, wherein the covering portion is configured such that a 3-30 elastic ratio (We3/Wt3)/(We30/Wt30) of the covering portion is 0.47 or more, where We3 is an elastic workload and Wt3 is a total workload measured by applying a load on the covering portion under a load push-in condition of 3 mN/10 seconds, and We30 is an elastic workload and Wt30 is a total workload measured by applying a load on the covering portion under a load push-in condition of 30 mN/10 seconds. - View Dependent Claims (2, 3, 4, 20)
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5. A transfer device comprising:
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an image carrier that carries a toner image on a surface thereof; and a transfer nip roller connected to an electrical ground, the transfer nip roller being in surface contact with the image carrier and operative to transfer an image from the image carrier to a recording medium passing between a nip formed by the image carrier and the transfer nip roller, the transfer nip roller including a core; a covering portion that covers a surface of the core and includes an elastic layer on a surface of the core and a surface layer on the elastic layer, wherein the covering portion is configured such that a 3-30 elastic ratio (We3/Wt3)/(We30/Wt30) of the covering portion is 0.47 or more, where We3 is an elastic workload and Wt3 is a total workload measured by applying a load on the covering portion under a load push-in condition of 3 mN/10 seconds, and We30 is an elastic workload and Wt30 is a total workload measured by applying a load on the covering portion under a load push-in condition of 30 mN/10 seconds. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 16, 18)
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14. An image forming apparatus comprising:
a transfer device including an image carrier that carries a toner image on a surface thereof; and a transfer nip roller connected to an electrical ground, the transfer nip roller being in surface contact with the image carrier and operative to transfer an image from the image carrier to a recording medium passing between a nip formed by the image carrier and the transfer nip roller, the transfer nip roller including a core; a covering portion that covers a surface of the core and includes an elastic layer on a surface of the core and a surface layer on the elastic layer, wherein the covering portion is configured such that a 3-30 elastic ratio (We3/Wt3)/(We30/Wt30) of the covering portion is 0.47 or more, where We3 is an elastic workload and Wt3 is a total workload measured by applying a load on the covering portion under a load push-in condition of 3 mN/10 seconds, and We30 is an elastic workload and Wt30 is a total workload measured by applying a load on the covering portion under a load push-in condition of 30 mN/10 seconds. - View Dependent Claims (15, 17, 19)
Specification