Image forming apparatus and image forming method
AssigneeToshiba Tec Kabushiki Kaisha
InventorShunsuke Katahira
Life of this patent
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Abstract
The invention provides and image forming apparatus adapted to form images on the opposite surfaces of a sheet of copying paper. More specifically, an image forming apparatus according to the invention is adapted for forming images on the opposite surfaces of a sheet of copying paper and includes a control device for controlling the location of the image formed on one of the opposite surfaces of the sheet of copying paper in correspondence to the location of the image formed on the other surface of the sheet of copying paper in order to minimize the mis-registration of the images formed on the opposite surfaces of the sheet of copying paper.
Claims12
An image forming apparatus having:
- a first image forming means for feeding a sheet of recording paper and forming an image on one of the opposite surfaces of the sheet;
- and
- a second image forming means for feeding the sheet of recording paper carrying the image formed by said first image forming means on one of the opposite surfaces of the sheet and forming another image on the other surface of the sheet;
- said image forming apparatus comprising:
- a measuring means for measuring the time period from the time when the operation of forming an image on one of the opposite surfaces of the sheet of recording paper of the first image forming means starts to the time when the tail end of the sheet of recording paper passes a predetermined detecting position;
- and
- a control means for controlling the time of starting the operation of forming another image on the opposite surface of the sheet of recording paper of the second image forming means on the basis of the time period measured by the measuring means.
An image forming method having:
- a first image forming step of feeding a sheet of recording paper and forming an image on one of the opposite surfaces of the sheet;
- and
- a second image forming step of feeding the sheet of recording paper carrying the image formed in said first image forming step on one of the opposite surfaces of the sheet and forming another image on the other surface of the sheet;
- said image forming method comprising:
- a time measuring step for measuring the time period from the time when the operation of forming an image on one of the opposite surfaces of the sheet of recording paper of the first image forming step starts to the time when the tail end of the sheet of recording paper passes a predetermined detecting position;
- and
- a control step of controlling the time of starting the operation of forming another image on the opposite surface of the sheet of recording paper of the second image forming step on the basis of the time period measured in the measuring step.
An image forming apparatus comprising:
- an image forming unit which forms a first image on first surface of a sheet of paper and a second image on a second surface opposite to the first surface of the sheet of paper;
- a timer which measures a time period from a time when the image forming unit starts to form the first image on the first surface of a sheet of paper to a time when a trail end of the sheet of paper passes a predetermined detection position;
- and
- a processing unit which controls the image forming unit to start an image forming operation of the second image on the second surface of the sheet of paper based on the time period measured by the timer.
Dependencies are inferred from the claim text.