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EP-4741168-A2 - IMAGE FORMING APPARATUS, CONTROL METHOD OF IMAGE FORMING APPARATUS, AND PROGRAM

EP4741168A2EP 4741168 A2EP4741168 A2EP 4741168A2EP-4741168-A2

Abstract

An image forming apparatus (100) comprises an image forming unit (202) that forms an image on a print medium (111), a feeding unit (104) that feeds the print medium (111) to the image forming unit in a forward direction and that rewinds the print medium (111) in a reverse direction opposite to the forward direction, and a control unit that executes a first setting (501) for rewinding the print medium after completion of image forming of a job and a second setting (502) for not rewinding the print medium after completion of image forming of a job, which are selectable in advance, wherein in a case where the first setting is selected by the user, after completion of image forming of the job, the control unit rewinds the print medium in the reverse direction and then resumes image forming from a second region on the feeding unit (104) side of a first region in which the image is formed by the image forming unit (202) in the print medium.

Inventors

  • YASUZAKI, KOJI

Assignees

  • Canon Kabushiki Kaisha

Dates

Publication Date
20260513
Application Date
20231030

Claims (15)

  1. An image forming apparatus (100) comprising: an image forming unit (202) that forms an image on a print medium (111); a feeding unit (104) that feeds the print medium (111) to the image forming unit in a forward direction and that rewinds the print medium (111) in a reverse direction opposite to the forward direction; and a control unit that executes a first setting (501) for rewinding the print medium after completion of image forming of a job and a second setting (502) for not rewinding the print medium after completion of image forming of a job, which are selectable in advance, wherein in a case where the first setting is selected by the user, after completion of image forming of the job, the control unit rewinds the print medium in the reverse direction and then resumes image forming from a second region on the feeding unit (104) side of a first region in which the image is formed by the image forming unit (202) in the print medium.
  2. The image forming apparatus according to claim 1, further comprising a drying device that dries the print medium (111) after the image forming unit forms the image on the print medium.
  3. The image forming apparatus (100) according to claim 1 or 2, further comprising a panel configured to display job lists which contain a type of print medium and a number of pages of each job.
  4. The image forming apparatus (100) according to any one of claims 1 to 3, further comprising a rewinding distance setting unit that sets a rewinding distance by which the print medium (111) is conveyed in the reverse direction, wherein the control unit (204) causes the feeding unit to perform a rewinding operation of conveying the print medium (111) in the direction opposite to the forward direction, based on the rewinding distance set by the rewinding distance setting unit.
  5. The image forming apparatus (100) according to claim 4, wherein the image forming unit (202) performs the image forming based on the job, the control unit obtains information on whether stop of the image forming by the image forming unit is stop in middle of the job or not.
  6. The image forming apparatus (100) according to claim 5, wherein, in the case where the stop is the stop in middle of the job, the control unit (204) determines whether to cause the feeding unit (104) to perform rewinding or not.
  7. The image forming apparatus (100) according to claim 1, wherein an image of a second job following the job is formed in the second region.
  8. The image forming apparatus (100) according to claim 1, wherein the control unit obtains information on whether a print medium (111) in the second job following the job is the same as a print medium in the job or not.
  9. The image forming apparatus (100) according to claim 4, wherein, in the case where the print medium (111) in the second job is not the same as the print medium (111) in the job, the rewinding distance setting unit sets the rewinding distance to 0.
  10. The image forming apparatus (100) according to claim 1, wherein the control unit obtains information on whether or not a splice tape for connecting print medium (111) to each other is present at a position where the image forming unit is to resume image forming.
  11. The image forming apparatus (100) according to claim 7, wherein the image forming unit (202) includes a first image forming unit (102) and a second image forming unit (103) arranged upstream of the first image forming unit (102) in the forward direction, and the control unit obtains information on whether or not image forming of the second job includes image forming by the second image forming unit (103).
  12. The image forming apparatus (100) according to claim 11, wherein the first image forming unit (102) performs image forming in basic colors of CMYK, and the second image forming unit (103) performs image forming in a particular color other than the basic colors.
  13. The image forming apparatus (100) according to claim 7, wherein the control unit obtains conveyance speed in image forming of the second job, as the information on the status.
  14. The image forming apparatus (100) according to claim 1, further comprising: a winding unit that winds the print medium (111) fed by the feeding unit (104); and a conveyance unit (119, 120) that conveys the print medium (111) between the feeding unit (104) and the winding unit.
  15. The image forming apparatus (100) according to claim 1, wherein the image forming unit (202) includes a first image forming unit (102) and a second image forming unit (103) arranged upstream of the first image forming unit (102) in the forward direction.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an image forming apparatus, a control method, and a program. Description of the Related Art In a general image forming apparatus that performs image forming on a continuous paper (hereinafter, roll paper), the image forming is performed while the roll paper is conveyed at constant speed. In the case where the image forming is stopped, the roll paper is conveyed by some degree due to an action of inertia or the like and is then stopped. The stop of image forming includes stop at job completion and suspension in middle of a job. In the suspension in middle of a job, a portion that has been conveyed by a predetermined amount in the stop is in a blank state because no image forming is performed, and the roll paper needs to be rewound by a predetermined amount in the case where the image forming is to be restarted. Japanese Patent Laid-Open No. 2012-200976 discloses a technique in which, in printing of pictures, a timing mark is printed for each picture and this timing mark is used to align a roll paper. Specifically, after printing stop, a printer conveys the roll paper in a reverse direction while detecting the timing marks, and aligns the roll paper at a position in consideration of also a runway length to allow the next picture to be printed at normal forward feeding speed from a position successive to the last printed picture. This can reduce wasted paper due to a blank portion. The reverse rotation conveyance is unnecessary in some cases depending on a status at the printing stop. However, since the reverse rotation conveyance is always performed in the case of the printing stop in Japanese Patent Laid-Open No. 2012-200976, a wasteful operation is sometimes performed in the printing operation. Moreover, in the case where the rewinding (reverse rotation conveyance) is necessary, the suitable rewinding distance varies depending on printing conditions of the next job. Also in this case, since the fixed reverse rotation conveyance is performed in Japanese Patent Laid-Open No. 2012-200976, the next printing cannot be started from the suitable position in some cases. SUMMARY OF THE INVENTION Accordingly, the present invention provides an image forming apparatus, a control method of an image forming apparatus, and a program that allow image forming to be resumed at a suitable position with respect to a roll paper. The present invention in its first aspect provides an image forming apparatus as in claims 1 to 15. The present invention in its second aspect provides a control method of an image forming apparatus as in claim 16. The present invention in its third aspect provides a program as in claim 17. The present invention can provide an image forming apparatus, a control method of an image forming apparatus, and a program that allow image forming to be resumed at a suitable position with respect to a roll paper. Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram illustrating an example of an apparatus configuration of an image forming system;Fig. 2 is a functional block diagram illustrating a control configuration of an image forming apparatus;Fig 3 is diagram showing the relationship of Fig. 3A and Fig. 3B, and Fig. 3A and Fig. 3B are flowcharts illustrating a rewinding conveyance process in printing stop;Fig. 4 is a flowchart illustrating a rewinding conveyance process in suspension;Fig. 5 is a diagram illustrating a selection screen of an automatic rewinding setting method;Fig. 6 is a diagram illustrating the selection screen of the automatic rewinding setting method;Fig. 7 is a diagram illustrating a screen of a job list;Fig. 8 is a diagram explaining a print job input method;Fig. 9A is a diagram illustrating reverse rotation conveyance positions in the image forming apparatus and a roll paper;Fig. 9B is a diagram illustrating the reverse rotation conveyance positions in the image forming apparatus and the roll paper;Fig. 9C is a diagram illustrating the reverse rotation conveyance positions in the image forming apparatus and the roll paper;Fig. 9D is a diagram illustrating the reverse rotation conveyance positions in the image forming apparatus and the roll paper;Fig. 10 is a diagram illustrating an example of the apparatus configuration of the image forming system;Fig. 11 is a diagram illustrating the reverse rotation conveyance positions (rewinding positions) in the image forming apparatus;Figs. 12A and 12B are diagrams illustrating the relation between a conveyance length and conveyance speed of a conventional printing apparatus and a finished product; andFigs. 13A and 13B are diagrams illustrating the relation between a conveyance length and conveyance speed of the image forming system and the finished product. DESCRIPTION OF THE EMBODIMENTS An embodiment of the