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Image forming apparatus

An imaging device and imaging technology, applied in the direction of instruments, electrical recording process equipment using charge patterns, optics, etc., can solve problems such as cost increase

Inactive Publication Date: 2009-08-26
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the monitoring system of the above Japanese Patent Laid-Open No. 2563160, for each of the first and second memories, the memory capacity (the number of bits) needs to be sufficient to express (express) the lifetime of the cartridge, and therefore, this results in an increase in the cost of the cartridge Increase

Method used

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Embodiment Construction

[0014] Preferred embodiments of the imaging apparatus according to the present invention will be described with reference to the accompanying drawings. figure 1 is a block diagram of a schematic configuration of the imaging device of the present invention. exist figure 1 Among them, the image forming apparatus 10 includes a plurality of control sections and the specific control section 11 manages the attachment and detachment of the consumable unit 20 and the current amount in the consumable unit 20 .

[0015] The consumable unit applied to the present invention is a unit such as a photosensitive unit or a transfer unit that needs to be replaced or replenished according to the remaining amount (current amount) of the consumable, operation time, and number of operations, and the like. A toner cartridge will be taken as an example in the following description.

[0016] The control section 11 includes: a ROM (Read Only Memory) 12 storing a program for controlling the operation ...

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Abstract

An image forming apparatus that prevents fraudulent alteration of the working life of a replaceable unit is provided. The unit includes a first memory that can store the consumed amount of the unit, and a second memory that has a plurality of flags. 'OFF' of each of the flags is not changeable to 'ON'. The image forming apparatus includes a portion that counts upward a stored value of the first memory associated with use of the unit and the portion initializes the first memory when the stored value of the first memory exceeds the maximal value. The portion changes the state of any one flag in 'ON' of the second memory to 'OFF'. The image forming apparatus also includes a portion that judges the working life of the unit based on the stored value of the second memory and the portion signals the working life.

Description

technical field [0001] The present invention relates generally to an image forming apparatus, and, more particularly, to a technique for preventing falsification of the life of a replaceable consumable used in the image forming apparatus. Background technique [0002] For example, the toner amount obtained by subtracting the consumed amount from the initially set toner amount is stored in the volatile memory as the current toner amount in the replaceable cartridge. Thus, the lifetime of the cartridge can be intentionally extended by rewriting the contents of the volatile memory. [0003] Therefore, the monitoring system of Japanese Patent Laid-Open No. 2563160 includes a first memory (EEPROM) and a second memory (PROM) in a replaceable cartridge. The first memory stores the current amount in the cartridge (for example, the number of printable sheets or the amount of remaining toner). The second memory includes a plurality of flags and can change the state of each flag from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00G03G15/08
CPCG03G15/556G03G15/553G03G2221/1823
Inventor 石仓薰
Owner SHARP KK