Image forming apparatus using a process unit

• US 5,548,374 A
• Filed: 06/07/1995
• Issued: 08/20/1996
• Est. Priority Date: 06/24/1992
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Tsuda, Yukio, Iguchi, Michihisa
• Primary Examiner(s): Smith, Matthew S.
• Application Number:
  US08/467,516
• Time in Patent Office: 440 Days
• Field of Search: 355/755
• US Class Current: 399/24
• CPC Class Codes: G03G 15/55 Self-diagnostics; Malfunction or lifetime display
• CPC Class Codes: G03G 15/553 Monitoring or warning means for exhaustion or lifetime end of consumables, e.g. indication of insufficient copy sheet quantity for a job
• CPC Class Codes: G03G 15/556 for toner consumption, e.g. pixel counting, toner coverage detection or toner density measurement
• CPC Class Codes: G03G 21/1889 for auto-setting of process parameters, lifetime, usage
• CPC Class Codes: G03G 2221/1663 having lifetime indicators
• CPC Class Codes: G03G 2221/1823 Cartridges having electronically readable memory

Abstract

In a recording apparatus for performing electro-static recording using toner, an image forming apparatus has a process unit including, as one unit, at least a photosensitive member and a spent toner holding section, a first counter for counting a total amount of use of the photosensitive member and a second counter for counting a total amount of toner that has been consumed. A determining section using the process unit determines the necessity for the process unit to be replaced with a new process unit by comparing a total amount of use of the photosensitive member counted by the first counter with a first predetermined reference value and the total amount of consumed toner with a second predetermined reference reference value according to whether the total amount of use of the photosensitive member exceeds the first reference value or the total amount of toner counted exceeds the second reference value.

Claims

1. An image forming apparatus comprising:

an image forming apparatus body;

a process unit detachably mounted on said body of the image forming apparatus and including a photosensitive member, a toner supplying section which supplies toner to the photosensitive member and to which a toner pack is detachably mounted, and a spent toner holding section for receiving spent toner from the photosensitive member, the photosensitive member, the toner supplying section, and the spent toner holding section being integral with the process unit so as to be removable together with the toner and the spent toner being sealed in the process unit when the process unit is detached from the body of the image forming apparatus;

first means for detecting whether or not said photosensitive member has reached its life limit;

second means for detecting whether or not said spent toner holding section has been filled with spent toner; and

means for informing a user of an operating status of said process unit when said first means detects that said photosensitive member has reached its life limit or when said second means detects that said spent toner holding section has been filled with spent toner.

2. The image forming apparatus according to claim 1, wherein said operating status includes an indication that the process unit needs to be replaced with a new process unit.

3. The image forming apparatus according to claim 1, wherein said first means counts an amount of times that recording sheets pass said photosensitive member.

4. The image forming apparatus according to claim 1, wherein said second means counts a number of times that the toner is supplied to the image forming apparatus.

5. The image forming apparatus according to claim 1, further comprising means for generating a light which is modulated in accordance with a signal of an image to be recorded,

wherein said second means cumulatively counts a length of time for which said photosensitive member is exposed with said generating means.

6. The image forming apparatus according to claim 1, further comprising detecting means for detecting whether or not there is at least a predetermined amount of toner to be used and wherein said second means counts a total amount of toner consumed based on a result of detection by said detecting means.

7. The image forming apparatus according to claim 6, wherein

said first means counts the number of rotations of said photosensitive member by counting a predetermined number of reference pulse signals from a step motor serving as a drive source for rotationally driving said photosensitive member;

and

said second means counts, based on a given state of change of an output signal from a toner sensor, the number of times that a predetermined amount of toner is supplied to a toner storage section.

8. The image forming apparatus according to claim 1, wherein said informing means further determines

whether or not an output signal coming from a toner sensor is varied from an output level of a first signal to an output level of a second signal and for, only when the output signal from said toner sensor is varied to the output level of the second signal, visually prompting the user to replace said process unit with a new process unit.

9. The image forming apparatus according to claim 8, wherein the informing means further stops

a recording operation after the prompting of the process unit replacement.

10. The image forming apparatus according to claim 1, wherein said informing means further monitors whether or not said process unit has been replaced with a new process unit, and resets said first and second means when said process unit has been replaced.

11. The image forming apparatus according to claim 1, wherein said photosensitive member is a photosensitive drum and said first means counts a total number rotations of said photosensitive drum.

12. An image forming apparatus according to claim 1, in which

said first means comprises means for counting a first total amount of use of said photosensitive member and means for comparing the first total amount with a first predetermined reference value, and

said second means comprises means for counting a second total amount of toner consumed and means for comparing the second total amount with a second predetermined reference value.

13. The image forming apparatus according to claim 12, wherein

when the first total amount matches the first predetermined reference value or the second total amount matches the second predetermined reference value, said determining means inhibits the image forming apparatus from recording an image until said process unit is replaced by a new process unit.

14. The image forming apparatus according to claim 12, wherein

the second reference value is set to a predetermined value at which, when a toner supplied at a given number of times corresponding to the second reference value is all used up, said spent toner holding section is nearly fully filled with a spent toner and, said process unit is determined as having nearly reached its service life limit.

15. An image forming apparatus comprising:

a detachable process unit including an image bearing member, a toner supplying section which supplies toner to the image bearing member and to which a toner pack is detachably mounted, and a spent toner holding section for receiving spent toner from the image bearing member, the image bearing member, the toner supplying section, and the spent toner holding section being integral with said process unit so as to be removable together with the toner and the spent toner being sealed in the process unit when said process unit is detached from a body of the image forming apparatus;

first means for detecting whether or not said image bearing member has reached its life limit;

second means for detecting whether or not said spent toner holding section has been filled with spent toner; and

means for determining the necessity for said process unit to be replaced with a new process unit when said first means detects that said image bearing member has reached its life limit or when said second means detects that said spent toner holding section has been filled with the spent toner.

16. An image forming apparatus according to claim 15, in which

said first means comprises means for counting a first total amount of use of said photosensitive member and means for comparing the first total amount with a first predetermined reference value, and

said second means comprises means for counting a second total amount of toner consumed and means for comparing the second total amount with a second predetermined reference value.

17. A process unit including:

a photosensitive member integral with a body of the process unit;

a spent toner holding section for receiving spent toner from said photosensitive member, the spent toner holding section being integral with the body of the process unit;

first means for detecting whether or not said photosensitive member has reached its life limit;

second means for detecting whether or not said spent toner holding section has been filled with spent toner; and

means for informing a user of an operating status of said process unit when said first means detects that said photosensitive member has reached its life limit or when said second means detects that said spent toner holding section has been filled with spent toner.

18. An image forming apparatus according to claim 17, in which

said first means comprises means for counting a first total amount of use of said photosensitive member and means for comparing the first total amount with a first predetermined reference value, and

said second means comprises means for counting a second total amount of toner consumed and means for comparing the second total amount with a second predetermined reference value.

19. An image forming apparatus comprising:

a process unit including a photosensitive member integral with said process unit and a spent toner holding section integral with said process unit;

first means for detecting whether or not said photosensitive member has reached its life limit;

second means for detecting whether or not said spent toner section has been filled with spent toner; and

means for informing a user of an operating status of said process unit when said first means detects that said photosensitive member has reached its life limit or when said second means detects that said spent toner section has been filled with spent toner.

20. An image forming apparatus according to claim 19, in which

said first means comprises means for counting a first total amount of use of said photosensitive member and means for comparing the first total amount with a first predetermined

said second means comprises means for counting a second total amount of toner consumed and means for comparing the second total amount with a second predetermined reference value.