Image forming apparatus with current detector and voltage control based on detection result

An image forming apparatus comprising:

• a transfer material bearing member for bearing a transfer material;
• a first image bearing member and a second image bearing member sequentially disposed along a conveying direction of the transfer material borne by said transfer material bearing member and for bearing images of different colors, respectively;
• first voltage applying means and second voltage applying means for applying a fist voltage and a second voltage, respectively, to said transfer material bearing member so that the images on said first image bearing member and said second image bearing member are sequentially superimposed and transferred on the transfer material borne by said transfer material bearing member;
• detecting means for detecting a voltage generated when a predetermined current is applied to an area, on which the transfer material is borne, of said transfer material bearing member before an image transfer is started;
• and
• control means for controlling said first voltage and said second voltage based on a detected result of said detecting means.

An image forming apparatus, comprising:

• a transfer material bearing member for bearing a transfer material;
• a first image bearing member and a second image bearing member sequentially disposed along a conveying direction of the transfer material borne by said transfer material bearing member and for bearing images of different colors, respectively;
• first voltage applying means and second voltage applying means for applying a first voltage and a second voltage, respectively, to said transfer material bearing member so that the images on said first image bearing member and said second image bearing member are sequentially superimposed and transferred on the transfer material borne by said transfer material bearing member;
• detecting means for detecting a current flowing through said transfer material bearing member when a predetermined voltage is applied to an area, on which the transfer material is not borne, of said transfer material bearing member before an image transfer is started;
• and
• control means for controlling said first voltage and said second voltage based on a detected result of said detecting means.

An image forming apparatus comprising:

• a transfer material bearing member for bearing a transfer material;
• a first image bearing member and a second image bearing member sequentially disposed along a conveying direction of the transfer material borne by said transfer material bearing member and for bearing images of different colors, respectively;
• first voltage applying means and second voltage applying means for applying a first voltage and a second voltage, respectively, to said transfer material bearing member so that the images on said first image bearing member and said second image bearing member are sequentially superimposed and transferred on the transfer material borne by said transfer material bearing member;
• detecting means for detecting a voltage generated when a predetermined current is applied to an area, on which the transfer material is not borne, of said transfer material bearing member before an image transfer is started;
• and
• control means for controlling said first voltage and said second voltage based on a detected result of said detecting means.

An image forming apparatus, comprising:

• an intermediate transfer member;
• a first image bearing member and a second image bearing member sequentially disposed along a moving direction of said intermediate transfer member and for bearing images of different colors, respectively;
• and
• first voltage applying means and second voltage applying means for applying a first voltage and a second voltage respectively to said intermediate transfer member so that the images on said first image bearing member and said second image bearing member are sequentially superimposed and transferred on said intermediate transfer member;
• wherein an image on said intermediate transfer member is transferred on a transfer material;
• detecting means for detecting a current flowing through said intermediate transfer member when a predetermined voltage is applied to said intermediate transfer member before transferring of the images from said first image bearing member and said second image bearing member to said intermediate transfer member is started;
• and
• control means for controlling said first voltage and said second voltage based on a detected result of said detecting means.

An image forming apparatus, comprising:

• an intermediate transfer member;
• a first image bearing member and a second image bearing member sequentially disposed along a moving direction of said intermediate transfer member and for bearing images of different colors, respectively;
• first voltage applying means and second voltage applying means for applying a first voltage and a second voltage respectively to said intermediate transfer member so that the images on said first image bearing member and said second image bearing member are sequentially superimposed and transferred on said intermediate transfer member;
• wherein an image on said intermediate transfer member is transferred on a transfer material;
• detecting means for detecting a voltage generated when a predetermined current is applied to said intermediate transfer member before transferring of the images from said first image bearing member and said second image bearing member to said intermediate transfer member is started;
• and
• control means for controlling said first voltage and said second voltage based on a detected result of said detecting means.

An image forming apparatus, comprising:

• an image bearing member for bearing an image;
• a transfer material bearing member for bearing a transfer material;
• voltage applying means for applying a voltage to said transfer material bearing member so that the image on said image bearing member is transferred on the transfer material borne by said transfer material bearing member;
• detecting means for detecting a current flowing through said transfer material bearing member when a predetermined voltage is applied to an area, on which the transfer material is borne, of said transfer material bearing member before an image transfer is started;
• and
• control means for controlling the voltage to be applied from said voltage applying means to said transfer material bearing member based on a detected result of said detecting means.

An image forming apparatus, comprising:

• an image bearing member for bearing an image;
• a transfer material bearing member for bearing a transfer material;
• voltage applying means for applying a voltage to said transfer material bearing member so that the image on said image bearing member is transferred on the transfer material borne by said transfer material bearing member;
• detecting means for detecting a voltage generated when a predetermined current is applied to an area, on which the transfer material is borne, of said transfer material bearing member before an image transfer is started;
• and
• control means for controlling the voltage to be applied from said voltage applying means to said transfer material bearing member based on a detected result of said detecting means.