| 摘要 |
A developing device includes a first developing roller, a second developing roller, a layer regulation member, a pair of division magnetic poles that divide a developer which is held by the second developing roller after passing through the layer regulation member and transfer the developer to the first developing roller, and a transfer amount regulation member that has a plate shape, is provided in a developer transfer path formed by the pair of division magnetic poles between the first developing roller and the second developing roller so as to extend in an axial direction of the first and second developing rollers, and is provided with a slit which regulates the amount of developer passing therethrough. |
| 主权项 |
1. A developing device comprising:
a first developing roller that has a cylindrical shape, is arranged with a predetermined gap from an outer circumferential surface of a rotating latent image holder, is rotated so that a moving direction of a portion approaching the latent image holder is opposite to that of the latent image holder, and holds and transports a developer with magnetic force; a second developing roller that has a cylindrical shape, is provided on a downstream side of the first developing roller in a rotational direction of the latent image holder, with a predetermined gap from the outer circumferential surface of the latent image holder and the first developing roller, is rotated so that a moving direction of a portion approaching the latent image holder is the same as that of the latent image holder, and holds and transports the developer with the magnetic force; a layer regulation member that is arranged with a predetermined gap from the second developing roller and regulates the height of a layer of the developer which is supplied and held by the outer circumferential surface of the second developing roller; a pair of division magnetic poles that have different polarities, are arranged in adjacent regions between the first and second developing rollers in an internal space of the first developing roller and an internal space of the second developing roller so as to face each other, without being rotated, divide the developer which is held by the second developing roller after passing through the layer regulation member, and transfer the developer to the first developing roller; a transfer amount regulation member that has a plate shape, is provided in a developer transfer path formed by the pair of division magnetic poles between the first developing roller and the second developing roller so as to extend in an axial direction of the first and second developing rollers, and is provided with a slit which regulates the amount of developer passing therethrough; a first fixed supporting body to which one end of each of the first developing roller and the second developing roller is attached and supported; a second fixed supporting body to which the other end of the first developing roller or the second developing roller is attached and supported; a swing supporting body to which the other end of the developing roller which is not supported by the second fixed supporting body is attached and supported and which is mounted to a shaft of the developing roller supported by the second fixed supporting body and swings on the shaft in a direction in which the swing supporting body approaches and is separated from the latent image holder; and a pressing mechanism that is attached to the second fixed supporting body and presses the swing supporting body in a direction in which the swing supporting body approaches the latent image holder, wherein the transfer amount regulation member includes one end which is attached to the first fixed supporting body and the other end which is attached to the swing supporting body. |
