Image forming apparatus having a function of predicting device deterioration based on a plurality of types of operation control information

• US 7,962,054 B2
• Filed: 09/17/2007
• Issued: 06/14/2011
• Est. Priority Date: 09/22/2006
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Oku, Takenori, Yamane, Jun, Shimizu, Hitoshi, Hirai, Shuji, Satoh, Osamu, Ue, Kohji, Yamashita, Masahide, Nakazato, Yasushi
• Primary Examiner(s): Gray; David M
• Assistant Examiner(s): Curran; Gregory H
• Application Number:
  US11/856,348
• Publication Number:
  US 20080075476A1
• Time in Patent Office: 1,366 Days
• Field of Search: 399/9, 399/15, 399/49, 399/301, 399/24, 399/31
• US Class Current: 399/31
• CPC Class Codes: G03G 15/55 Self-diagnostics; Malfunction or lifetime display
• CPC Class Codes: G03G 2215/0161 Generation of registration marks

Abstract

An image forming apparatus is provided. The image forming apparatus includes an acquiring unit that acquires a plurality of types of operation control information of the image forming apparatus that indicate deterioration of a toner in the image forming apparatus or deterioration of a component of the image forming apparatus. An index value calculating unit calculates an index value indicating a state of the image forming apparatus based on the acquired operation control information. An abnormality judging unit judges whether the image forming apparatus abnormality has occurred and predicts an occurrence of a failure that requires maintenance of the image forming apparatus due to deterioration of the toner in the image forming apparatus or deterioration of the component of the image forming apparatus based on the index value.

Claims

1. An image forming apparatus comprising:

an acquiring unit that acquires a plurality of types of operation control information of the image forming apparatus, the operation control information indicating a deterioration of a toner in the image forming apparatus or a deterioration of a component of the image forming apparatus;

an index value calculating unit that calculates an index value indicating a state of the image forming apparatus based on acquired operation control information;

an abnormality judging unit that judges whether an abnormality has occurred in the image forming apparatus or predicts an occurrence of a failure that requires a maintenance of the image forming apparatus due to the deterioration of the toner or the deterioration of the component based on calculated index value; and

a detection pattern position detecting unit that detects a position of a detection pattern formed directly on an image carrier, and outputs position detection data,

wherein the acquiring unit acquires various types of information contained in the position detection data as the types of operation control information,

wherein the detection pattern includes a first line pattern, a second line pattern, and a solid image pattern,

wherein the image carrier is a conveyor member that carries a recording paper onto which toner images are transferred, and

wherein the index value calculating unit counts a number of peaks in the position detection data to determine the index value.

2. The image forming apparatus according to claim 1, wherein

a plurality of pieces of position detection data are acquired;

information consistency based on each piece of position detection data is calculated; and

the index value calculating unit uses the calculated information consistency as the operation control information of the image forming apparatus.

3. The image forming apparatus according to claim 1, further comprising:

an image forming unit that forms a toner image in a plurality of colors on the image carrier; and

a color shifting correction controlling unit that forms a detection pattern in each color on the image carrier, uses the detection pattern position detecting unit to detect a position of the detection pattern in each color formed on the image carrier, calculates an amount of color shifting based on position detection data of the detection pattern in each color, and performs color shifting correction based on the amount of color shifting, wherein

the index value calculating unit uses information that is obtained based on the position detection data of the detection pattern and that is acquired during a control of the color shifting correction, as the operation control information of the image forming apparatus.

4. The image forming apparatus according to claim 3, wherein

the color shifting correction controlling unit repeats a process of forming the detection pattern in each color, using the detection pattern position detecting unit to detect the position of the detection pattern in each color formed on the image carrier, and calculating the amount of color shifting based on the position detection data of the detection pattern in each color, after performing the color shifting correction based on the calculated amount of color shifting, and

information based on the position detection data of the detection position acquired after the color shifting correction is performed is used to calculate the information consistency based on the position detection data.

5. The image forming apparatus according to claim 4, wherein

the color shifting correction controlling unit repeats a process of detecting the position of the detection pattern and calculating the amount of color shifting and performs the color shifting correction, when the calculated amount of color shifting is equal to or more than a predetermined amount of shifting or when an error in the calculation of the amount of color shifting occurs;

and

the index value calculating unit uses information indicating that the color shifting correction process has been repeated as the operation control information of the image forming apparatus.

6. The image forming apparatus according to claim 1, wherein the detection pattern image is a line image having a line width not less than 0.1 millimeter and not more than 1 millimeter.

7. The image forming apparatus according to claim 1, wherein the detection pattern image is a solid image having a line width equal to or more than 1 millimeter.

8. The image forming apparatus according to claim 1, wherein the types of operation control information include missing pixel operation control information that is obtained by evaluating a degree of variation of lines in the detection pattern.

9. The image forming apparatus according to claim 1, wherein the types of operation control information include pinhole operation control information that is obtained by identifying an absence of transitions from low to high in values output from the detection pattern position detecting unit.

10. The image forming apparatus according to claim 1, wherein the types of operation control information include wormhole operation control information that is obtained by counting a number of occurrences of transitions from low to high in values output from the detection pattern position detecting unit.

11. The image forming apparatus according to claim 1, wherein the types of operation control information include hat image operation control information that is obtained by evaluating a frequency of transitions from low to high in values output from the detection pattern position detecting unit.

12. An image forming apparatus comprising:

a detection pattern position detecting unit that detects a position of a detection pattern formed directly on an image carrier, and outputs position detection data, the image carrier being a conveyor member that carries a recording paper onto which toner images are transferred;

an acquiring unit that acquires a plurality of types of operation control information of the image forming apparatus from the position detection data, the operation control information including data of an abnormal detection pattern that occurs in the position detection pattern formed on the image carrier in response to a deterioration of a toner in the image forming apparatus or a deterioration of a specific component of the image forming apparatus that is specified by a type of the abnormal detection pattern;

an index value calculating unit that calculates an index value indicating a state of the image forming apparatus based on acquired operation control information, the index value calculating unit counts a number of peaks in the position detection data to determine the index value; and

an abnormality judging unit that judges whether an abnormality has occurred in the image forming apparatus or predicts an occurrence of a failure that requires a maintenance of the image forming apparatus due to the deterioration of the toner or the deterioration of the specific component based on calculated index value.