JP2001109236A5

JP2001109236A5 -

Info

Publication number: JP2001109236A5
Application number: JP1999281246A
Authority: JP
Filing date: 1999-10-01
Publication date: 2005-04-07

Description

（１０）担持部材に担持された磁気ブラシの磁性粒子の帯電能力を検知する検知手段を有し、該検知手段の検知情報に応じて磁気ブラシ更新動作モードが実行されることを特徴とする（８）または（９）に記載の画像形成装置。 (10) A detection means is provided for detecting the charging ability of the magnetic particles of the magnetic brush carried by the carrying member, and the magnetic brush update operation mode is executed according to the detection information of the detection means 8) The image forming apparatus according to (9).

（１１）担持部材に担持された磁気ブラシの磁性粒子の帯電能力の検知が磁性粒子の抵抗を測定することによってなされることを特徴とする（１０）に記載の画像形成装置。 (11) The image forming apparatus according to (10), wherein the charging ability of the magnetic particles of the magnetic brush carried by the carrier member is detected by measuring the resistance of the magnetic particles.

（１３）前記担持体が回転体であり、前記磁性粒子離脱手段が前記担持部材に接離制御されるスクレーパであることを特徴とする（８）ないし（１２）の何れかに記載の画像形成装置。 (13) The image formation according to any one of (8) to (12), wherein the carrier is a rotating body, and the magnetic particle separating means is a scraper whose contact with and is controlled by the carrier. Device .

（１４）前記磁性粒子供給手段は、磁性粒子を貯留させたホッパーであることを特徴とする（８）ないし（１３）の何れかに記載の画像形成装置。 (14) The image forming apparatus according to any one of (8) to (13), wherein the magnetic particle supply unit is a hopper storing magnetic particles.

Claims

In a charging device for charging by bringing a magnetic brush of magnetic particles carried on a carrying member into contact with a member to be charged,
Magnetic particle separating means for separating magnetic particles forming a magnetic brush from the supporting member;
Magnetic particle collection means for collecting magnetic particles separated from the support member;
Magnetic particle supply means for supplying new magnetic particles to the support member from which the magnetic particles are separated;
And a magnetic brush updating operation mode for separating magnetic particles forming the magnetic brush from the support member and supporting the magnetic brush with new magnetic particles.

2. The apparatus according to claim 1, further comprising detection means for detecting the charging ability of the magnetic particles of the magnetic brush carried by the carrying member, wherein the magnetic brush update operation mode is executed according to the detection information of the detection means. Description charging device.

3. The charging device according to claim 2, wherein the detection of the chargeability of the magnetic particles of the magnetic brush carried by the carrier member is performed by measuring the resistance of the magnetic particles.

The charging device according to any one of claims 1 to 3, wherein the carrier is a rotating body, and the magnetic particle separating means is a scraper which is controlled to contact or separate from the carrier.

The charging device according to any one of claims 1 to 4, wherein the magnetic particle collection means is a container for collecting magnetic particles separated from the support member by magnetic particle separation means.

The charging device according to any one of claims 1 to 5, wherein the magnetic particle supply means is a hopper storing magnetic particles.

7. An image forming apparatus for forming an image by applying an imaging process including a charging step of charging the image carrier to an image carrier, wherein the charging means for charging the image carrier is any one of claims 1 to 6. An image forming apparatus, which is the charging device described above.

A first image carrier, a charging unit for charging the image carrier, a unit for forming a toner image on the image carrier charged by the charging unit, and a toner image on a second image carrier 1. An image forming apparatus comprising: transfer means for transferring; and cleaning means for removing transfer residual toner remaining on a first image carrier after transfer,
The charging means for charging the first image carrier is a charging device for charging by bringing a magnetic brush of magnetic particles carried on the carrier member into contact with the first image carrier,
Magnetic particle separating means for separating magnetic particles forming a magnetic brush from the supporting member;
Magnetic particle collection means for collecting magnetic particles separated from the support member;
Magnetic particle supply means for supplying new magnetic particles to the support member from which the magnetic particles are separated;
An image forming apparatus having a magnetic brush update operation mode for separating magnetic particles forming the magnetic brush from the support member and supporting the magnetic brush with new magnetic particles.

A first image carrier, a charging unit for charging the image carrier, a unit for forming a toner image on the image carrier charged by the charging unit, and a toner image on a second image carrier 1. An image forming apparatus comprising: transfer means for transferring; and cleaning means for removing transfer residual toner remaining on a first image carrier after transfer,
The charging means for charging the first image carrier is a charging device for charging by bringing a magnetic brush of magnetic particles carried on the carrier member into contact with the first image carrier,
Magnetic particle separating means for separating magnetic particles forming a magnetic brush from the supporting member;
Magnetic particle collection means for collecting magnetic particles separated from the support member;
Magnetic particle supply means for supplying new magnetic particles to the support member from which the magnetic particles are separated;
A magnetic brush update operation mode for separating the magnetic particles forming the magnetic brush from the support member and supporting the magnetic brush by the new magnetic particles, and in the cleaning means from the first image carrier An image forming apparatus, wherein a recovery container for recovering the removed toner doubles as the magnetic particle recovery unit.

9. A magnetic brush updating operation mode is executed according to the detection information of the detection means for detecting the charging ability of the magnetic particles of the magnetic brush carried on the support member. 9. The image forming apparatus according to 9.

11. The image forming apparatus according to claim 10, wherein the detection of the charging ability of the magnetic particles of the magnetic brush carried by the carrier member is performed by measuring the resistance of the magnetic particles.

Detection by the detection means of the charging ability of the magnetic particles of the magnetic brush carried on the carrying member, image formation when execution of the magnetic brush update operation mode according to the detection information of the detection means exceeds a predetermined number of image output sheets The image forming apparatus according to claim 10, which is performed later.

The image forming apparatus according to any one of claims 8 to 12, wherein the carrier is a rotating body, and the magnetic particle separating unit is a scraper which is controlled to contact or separate from the carrier.

The image forming apparatus according to any one of claims 8 to 13, wherein the magnetic particle supply unit is a hopper storing magnetic particles.

The means for forming a toner image on the image carrier charged by the charging means forms an electrostatic latent image on the image carrier charged by the charging means by the image exposing means, and the developing device carrying the toner particles The image forming apparatus according to any one of claims 8 to 14, which is a means for forming a toner image corresponding to a latent image.