JP2006276700A5

JP2006276700A5 -

Info

Publication number: JP2006276700A5
Application number: JP2005098557A
Authority: JP
Filing date: 2005-03-30
Publication date: 2008-05-15

Claims

A method for detecting a conveyance speed of a recording paper in an image forming apparatus in which an unfixed toner image is transferred onto a recording paper by a transfer member and fixed.
Detecting a change timing of a current or voltage applied to the transfer member;
Based on the change timing, obtaining a time required for the recording paper leading edge to the recording paper trailing edge to pass through the transfer member;
A recording paper conveyance speed detection method comprising: calculating a recording paper conveyance speed based on the obtained time and the recording paper size.

A recording paper conveyance speed control method in an image forming apparatus for transferring and fixing an unfixed toner image onto a recording paper by a transfer member,
Detecting a change timing of a current or voltage applied to the transfer member;
Based on the change timing, obtaining a time required for the recording paper leading edge to the recording paper trailing edge to pass through the transfer member;
Calculating a recording paper conveyance speed based on the obtained time and the recording paper size;
And a step of correcting the transport speed so that the calculated transport speed matches the target transport speed.

  An image forming apparatus for transferring a toner image on the image carrier onto a recording paper by passing the recording paper through a nip portion between the image carrier and a transfer member,
  A detecting means for detecting a change timing of a current or voltage applied to the transfer member;
  An image forming apparatus that detects a point of time when the leading edge of the recording paper enters the nip portion or a point of time when the trailing edge of the recording paper comes out based on the change timing.

An image forming apparatus for transferring and fixing an unfixed toner image onto a recording sheet by a transfer member,
Detection means for detecting a change timing of the current or voltage applied to the transfer member;
Means for obtaining a time required for the recording paper from the leading edge of the recording paper to the trailing edge of the recording paper to pass through the transfer member based on the change timing;
Means for calculating the conveyance speed of the recording paper based on the obtained time and the recording paper size;
An image forming apparatus comprising: a conveyance speed changing unit configured to change the conveyance speed so that the calculated conveyance speed matches a target conveyance speed.

The image forming apparatus according to claim 4 , wherein the conveyance speed changing unit changes the conveyance speed by changing a recording paper conveyance speed of the fixing unit.

Said change in the transportation speed by transportation speed change means, an image forming apparatus according to claim 4 or 5, characterized in that between the next print was calculated recording paper conveying speed printing.