JP2014145950A5

JP2014145950A5 -

Info

Publication number: JP2014145950A5
Application number: JP2013015098A
Authority: JP
Filing date: 2013-01-30
Publication date: 2016-01-07
Anticipated expiration: 2033-01-30

Description

上記目的を達成するために、本発明は、画像情報に応じた潜像を表面に担持する潜像担持体と、上記潜像担持体上の潜像を現像してトナー像を形成する現像装置と、上記潜像担持体上のトナー像を、記録材へ直接転写し、又は中間転写体を介して記録材へ転写する転写手段と、所定のトナー強制消費制御実施条件が満たされたとき、当該現像装置内のトナーを強制的に消費するトナー強制消費制御を実施するトナー強制消費制御手段とを有する画像形成装置において、所定の転写バイアス切替条件に従って、記録材へトナー像を転写するときに上記転写手段が印加する転写バイアスを、直流成分のみからなる直流転写バイアス、又は、直流成分に交流成分が重畳していて極性が時間変化する重畳転写バイアスへ切り替える転写バイアス切替手段を有し、上記トナー強制消費制御手段は、連続画像形成動作中における画像情報に応じた潜像を現像する現像処理期間から外れた非現像処理期間に、上記トナー強制消費制御を実施する画像間トナー強制消費制御を行うものであり、上記トナー強制消費制御手段は、上記連続画像形成動作の転写バイアスが上記重畳転写バイアスである場合、該連続画像形成動作の転写バイアスが上記直流転写バイアスである場合よりも、該連続画像形成動作中に行う画像間トナー強制消費制御で強制的に消費されるトナー量が少なくなるように制御することを特徴とする。 To achieve the above object, the present invention includes a latent image bearing member for carrying on the surface a latent image corresponding to the image information, that to form a toner image by developing the latent image on the upper Kisenzo carrier and the current image apparatus, the toner image on the upper Kisenzo carrier, directly transferred to the recording material, or a transfer unit that transfers through the intermediate transfer member to the recording material, predetermined toner forced consumption control execution condition is satisfied In the image forming apparatus having toner forced consumption control means for performing toner forced consumption control for forcibly consuming toner in the developing device, a toner image is recorded on the recording material according to a predetermined transfer bias switching condition. The transfer bias applied by the transfer means during transfer is switched to a DC transfer bias consisting of only a DC component, or a superimposed transfer bias in which the AC component is superimposed on the DC component and the polarity changes over time. Has, the toner forced consumption control means, a latent image corresponding to the image information in the continuous image forming operation in the non-developing period deviating from the development processing period you current image, carrying out the above toner forced consumption control The toner forced consumption control between images is performed, and the toner forced consumption control means is configured such that when the transfer bias of the continuous image forming operation is the superimposed transfer bias, the transfer bias of the continuous image forming operation is the DC transfer bias. Than the case where the toner amount is forcibly consumed in the inter-image toner forced consumption control performed during the continuous image forming operation.

Claims

A latent image carrier that carries a latent image according to image information on the surface;
And the current image device that form a toner image by developing the latent image on the upper Kisenzo carrier,
The toner image on the upper Kisenzo bearing member, a transfer unit and directly transferred to the recording material, or to transfer to the recording material through an intermediate transfer member,
In an image forming apparatus having toner forced consumption control means for performing toner forced consumption control for forcibly consuming toner in the developing device when a predetermined toner forced consumption control execution condition is satisfied,
The transfer bias applied by the transfer means when transferring a toner image to a recording material in accordance with a predetermined transfer bias switching condition is a DC transfer bias consisting of only a DC component, or a polarity in which an AC component is superimposed on a DC component. Has a transfer bias switching means for switching to a superimposed transfer bias that changes over time,
The toner forced consumption control means, a latent image corresponding to the image information in the continuous image forming operation in the non-developing period deviating from the development processing period you current image, the image between the toner forced to carry out the toner forced consumption control To control consumption,
When the transfer bias of the continuous image forming operation is the superimposed transfer bias, the toner forced consumption control unit is performing the continuous image forming operation more than when the transfer bias of the continuous image forming operation is the DC transfer bias. An image forming apparatus that controls to reduce the amount of toner that is forcibly consumed in the forced toner consumption control between images.

The image forming apparatus according to claim 1.
Image area ratio storage means for storing the image area ratio of images formed in the past predetermined period;
The toner forced consumption control means determines a toner amount to be forcibly consumed by the inter-image toner forced consumption control according to the image area ratio stored in the image area ratio storage means. An image forming apparatus that performs toner forcible consumption control between images so as to be forcibly consumed during a continuous image forming operation.

The image forming apparatus according to claim 1 or 2,
The toner forced consumption control unit performs an image forming operation using the DC transfer bias when a pre-toner forced consumption control execution condition that the transfer bias switching unit switches from the superimposed transfer bias to the DC transfer bias is satisfied. An image forming apparatus that performs pre-toner forced consumption control that performs the toner forced consumption control before starting.

The image forming apparatus according to claim 2.
The toner forced consumption control unit performs an image forming operation using the DC transfer bias when a pre-toner forced consumption control execution condition that the transfer bias switching unit switches from the superimposed transfer bias to the DC transfer bias is satisfied. Prior to starting the toner forced consumption control to perform the toner forced consumption control,
Further, the toner forced consumption control means, when the prior toner forced consumption control execution condition is satisfied, the prior toner forced consumption control means according to the image area ratio of the image formed by the image forming operation using the immediately preceding superimposed transfer bias. An image forming apparatus that determines whether to perform forced toner consumption control and does not perform forced toner consumption control when it is determined not to perform forced toner consumption control.

The image forming apparatus according to any one of claims 1 to 4, wherein:
The superimposed transfer bias has a time average value (Vave) set to a polarity in a transfer direction in which the toner image is transferred from the latent image carrier or intermediate transfer member side to the recording material side, and a central value between the maximum value and the minimum value. An image forming apparatus that is set closer to the transfer direction than (Voff).

  A latent image carrier that carries a latent image according to image information on the surface;
  A developing device for developing a latent image on the latent image carrier to form a toner image;
  A transfer means for transferring the toner image on the latent image carrier directly to a recording material or transferring it to a recording material via an intermediate transfer body;
  The transfer bias applied by the transfer means when transferring the toner image to the recording material is a DC transfer bias consisting of only a DC component and a superimposed transfer bias in which the AC component is superimposed on the DC component and the polarity changes over time. Transfer bias switching means for switching between,
  When the transfer bias switching unit switches the transfer bias from the superimposed transfer bias to the DC transfer bias, the toner in the developing device is forcibly consumed before starting an image forming operation using the DC transfer bias. An image forming apparatus comprising: a forced toner consumption control unit.