JP2008256960A - Image forming apparatus - Google Patents

Abstract

An image forming apparatus capable of reliably completing an operation on a nonvolatile memory element even when the power is turned off due to a power failure or a user operation.
An image forming apparatus according to the present invention includes a rotating roller section 430, a magnet section 431 provided on the inner periphery of the roller section 430, a shaft center section 410 that does not rotate, and the shaft section 410. A developing roller 400 including a coil portion 411 provided on the outer periphery, a secondary battery that stores an electromotive force generated in the coil portion 411 of the developing roller 400, a nonvolatile memory element, and the nonvolatile memory element A memory writing circuit that performs writing, and when the power is cut off, the memory writing circuit uses the secondary battery as a backup power source.
[Selection] Figure 5

Description

  The present invention relates to an image forming apparatus and an image forming apparatus such as a printer, a copier, a facsimile machine, and a multi-function machine that form a latent image on a photosensitive member by laser scanning and develop the latent image to obtain an image. It relates to a control method.

  2. Description of the Related Art Conventionally, image forming apparatuses such as printers, copiers, facsimile machines, and multi-function machines are known in which a latent image is formed on a photosensitive member by laser scanning and an image is obtained by developing the latent image. ing. On the other hand, the toner cartridge used in such an image forming apparatus is provided with a non-volatile storage element, and the remaining amount of toner, the cumulative use time of the toner cartridge, the developing roller rotation time, the user use status in the non-volatile storage element. Information such as information is written. During writing of such a nonvolatile memory element, the power is turned off due to a power failure or user operation, writing to the nonvolatile memory element becomes incomplete, and a problem occurs when the image forming apparatus is restarted. was there.

In order to deal with such a problem, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 2003-54097), when the AC power supply voltage decreases, the operation of the engine unit EG and the driving DC-DC converter 103 serving as the power supply thereof is disclosed. To stop current consumption. A configuration is described in which the controller DC-DC converter 106 continues to supply power to the engine controller 1 using the electric charge stored in the smoothing capacitor 102 and the capacitor 105 connected via the backflow prevention diode 104. ing.
JP 2003-54097 A

  According to the configuration disclosed in Patent Document 1, in an image forming apparatus that operates using an AC voltage as a power source, even when the input voltage is reduced, the power source voltage to the control unit is maintained for a certain period and the control unit However, it is inevitable that the circuit configuration and control become complicated.

  Conventionally, when power is turned off due to a power failure or user operation while information is being stored in the nonvolatile storage means, a means that can detect this, for example, a “writing flag” is nonvolatile before the information storage starts. There was also a method to take measures by software processing such as re-writing after detecting an unexpected power failure by storing it in the sex memory means, but this method makes the processing complicated by software As a result, there is a problem that it takes man-hours such as operation check.

  In order to solve the above problems, an image forming apparatus of the present invention includes a rotating roller portion, a magnet portion provided on the inner periphery of the roller portion, a shaft center portion that does not rotate, and the shaft center portion. A developing roller comprising a coil portion provided on the outer periphery of the developing roller, a secondary battery for storing an electromotive force generated in the coil portion of the developing roller, a non-volatile memory element, and writing to the non-volatile memory element A memory writing circuit, and when the power is cut off, the memory writing circuit uses the secondary battery as a backup power source.

  In the image forming apparatus of the present invention, the nonvolatile memory element is provided in a toner cartridge.

  The image forming apparatus of the present invention is characterized in that information related to consumption of consumables is stored in the nonvolatile memory element.

  The image forming apparatus of the present invention is characterized in that the nonvolatile memory element stores information relating to the operating status of the apparatus.

  Further, the image forming apparatus of the present invention is characterized in that the axial center portion is constituted by a heat pipe.

  The image forming apparatus of the present invention is characterized in that the coil portion is constituted by an electric coil including a spring lead.

  According to the image forming apparatus of the present invention as described above, non-volatile storage is ensured even when the power is turned off due to a power failure or a user operation without complicating the circuit configuration and requiring complicated software processing. The operation on the element can be completed. Further, according to the image forming apparatus of the present invention, since the power generation mechanism is provided in the developing roller, it is not necessary to separately provide a power generator, and the apparatus configuration is simplified.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an overall configuration of an image forming apparatus taking a tandem type as an example according to an embodiment of the present invention. The image forming apparatus 100 includes a housing 103, a paper discharge tray 105 formed on an upper portion of the housing 103, and a door body 107 provided on the front surface of the housing so as to be openable and closable. An image forming unit 111, a blower fan 113, a transfer belt unit 115, and a paper feed unit 117 are provided, and a paper transport unit 19 is provided in the door body 107.

  The image forming unit 111 includes four toner cartridges 121 in which four developing devices that store different color toners can be set. The four toner cartridges 121 are for yellow, magenta, cyan, and black developing devices, and are denoted by reference numerals 121Y, 121M, 121C, and 121K in the drawing. In each of the toner cartridges 121Y, 121M, 121C, and 121K, a photosensitive member 123, a corona charging unit 125 provided around the photosensitive member 123, and a developing device 110 are provided.

  The transfer belt unit 115 is stretched between a driving roller 127 that is rotationally driven by a driving source (not shown), a driven roller 129 provided obliquely above the driving roller 127, and a tension roller 131. An intermediate transfer belt 133 that is driven to circulate in the counterclockwise direction X and a cleaning unit 134 that contacts the surface of the intermediate transfer belt 133 are provided. The driven roller 129, the tension roller 131, and the intermediate transfer belt 133 are arranged side by side so as to incline with respect to the drive roller 127. Thus, when the intermediate transfer belt 133 is driven, the belt conveyance direction X is downward. The belt surface 135 is positioned on the lower side, and the belt surface 137 whose transport direction is upward is positioned on the upper side.

  The photoconductor 123 is pressed against the belt surface 135 along the arched line and is driven to rotate in the direction indicated by the arrow in the drawing. By adjusting the position of the tension roller 31, the tension of the intermediate transfer belt 33, the curvature of the arch, and the like can be controlled.

The drive roller 127 also serves as a backup roller for the secondary transfer roller 139. On the peripheral surface of the drive roller 127, for example, a rubber layer having a thickness of about 3 mm and a volume resistivity of 10 ⁵ Ω · cm or less is formed. The secondary transfer roller is grounded through a metal shaft. A conductive path of the secondary transfer bias supplied via 139 is configured. In addition, the diameter of the driving roller 127 is smaller than the diameters of the driven roller 129 and the tension roller 131, so that the recording paper after the secondary transfer can be easily separated by the elastic force of the recording paper itself. The driven roller 129 also functions as a backup roller for the cleaning unit 134.

  The cleaning unit 134 is provided on the belt surface 135 side facing downward in the conveyance direction, and a cleaning blade 141 that removes toner remaining on the surface of the intermediate transfer belt 133 after the secondary transfer, and a toner conveyance path that conveys the collected toner. 142. The cleaning blade 141 is in contact with a portion where the intermediate transfer belt 133 is wound around the driven roller 129. Further, the primary transfer member 143 contacts the back surface of the intermediate transfer belt 133 at a position facing the photoconductor 123 of each toner cartridge 121Y, 121M, 121C, and 121K, and a transfer bias is applied to the primary transfer member 143. It has become so.

  The exposure unit 109 is provided in a space obliquely below the image forming unit 111, and a blower fan 113 is provided obliquely above the exposure unit 109. A paper feed unit 117 is provided below the exposure unit 109. In the exposure unit 109, scanner means 149 comprising a polygon mirror motor 145 and a polygon mirror 147 is vertically arranged on the bottom. In addition, a single f-θ lens 151 and a reflection mirror 153 are provided in the optical path B, and a plurality of foldings are made above the reflecting mirror 153 so that the scanning light paths of the respective colors are folded back in parallel with the photoconductor 123. A mirror 155 is provided.

  In the exposure unit 109, an image signal corresponding to each color is emitted from the polygon mirror 147 with a laser beam modulated and formed based on a common data clock frequency, and passes through the f-θ lens 151, the reflection mirror 153, and the folding mirror 155. The toner cartridges 121Y, 121M, 121C, and 121K are irradiated with the photosensitive members 123 to form latent images. The optical path length from the polygon mirror 147 of the exposure unit 109 to the photosensitive member 123 for each image forming unit 111 is configured to be substantially the same, so that the scanning width of the light beam scanned in each optical path is also substantially the same. It is the same, and no special configuration is required for forming the image signal. Accordingly, the laser light source can be modulated and formed based on a common data clock frequency in spite of being modulated in accordance with images of different colors by different image signals. Color misregistration caused by a relative difference in the scanning direction can be prevented, and a simple and inexpensive color image forming apparatus can be configured.

  The blower fan 113 functions as a cooling unit, guides air in the direction of the arrow, and performs a function of releasing heat from the exposure unit 109 and other heating units. As a result, the temperature rise of the polygon mirror motor 145 can be suppressed, the deterioration of image quality can be prevented, and the life of the polygon mirror motor 145 can be extended.

  The paper feed unit 117 includes a paper feed cartridge 157 on which the recording media P are stacked, and a pickup roller 159 that feeds the recording media P from the paper feed cartridge 157 one by one. The paper transport unit 119 includes a gate roller pair 161 that defines the timing of feeding the recording medium P to the secondary transfer unit, a secondary transfer roller 139 that is pressed against the drive roller 127 and the intermediate transfer belt 133, and a fixing unit 163. A pair of paper discharge rollers 165 and a conveyance path 167 for double-sided printing.

  The fixing unit 163 includes a rotatable fixing roller pair 169 including a heating element such as a halogen heater in at least one side, and at least one roller of the fixing roller pair 169 is pressed and biased to the other side so as to be secondary to the sheet material. The secondary image transferred to the recording medium is fixed to the recording medium at a predetermined temperature at the nip portion formed by the fixing roller pair 169. The pressing means presses the transferred secondary image against the recording medium P. Is done.

  The developing device 110 is of a type that circulates and uses toner, and is set in each toner cartridge 121Y, 121M, 121C, and 121K. The construction of these developing devices is basically the same.

  Next, a rotary type image forming apparatus will be described. FIG. 2 is a cross-sectional view showing the overall configuration of an image forming apparatus taking a rotary type as an example according to an embodiment of the present invention. The photoconductor 223 has a cylindrical conductive substrate and a photosensitive layer formed on the outer peripheral surface thereof, is rotatable about a central axis, and rotates clockwise as indicated by an arrow. The charging unit 225 charges the photoconductor 223, and the exposure unit 209 irradiates the charged photoconductor 223 with a beam from a built-in laser light source to form a latent image by static electricity. Beam irradiation of the exposure unit 209 is controlled by a drive signal modulated based on image information input from a host computer (not shown) or the like. Although a specific configuration in the exposure unit 209 is not shown, a polygon mirror and a polygon mirror motor are also provided in the exposure unit 209.

  The developing device 210 includes mounting portions 214K to 214Y to which a black toner cartridge 221B, a magenta toner cartridge 221M, a cyan toner cartridge 221C, and a yellow toner cartridge 221Y that store toner as developer are detachably mounted. The developing rotary is rotatable with respect to 213. The developing device 210 is rotated to bring the necessary toner cartridges 221B to 221Y close to the photoconductor 223, and the developer is supplied to the photoconductor 223 on which the latent image is formed, whereby the latent image is developed into an image by the developer. The

  The primary transfer unit 226 transfers the toner image formed on the photoconductor 223 to the intermediate transfer belt 233. The intermediate transfer belt 233 is an endless belt in which, for example, an aluminum vapor deposition layer is formed on the surface of a PET film and a semiconductive paint is formed on the surface thereof, and is driven to rotate at the same peripheral speed as the photoconductor 223. A print medium such as paper supplied from the paper supply cartridge 257 is conveyed to the secondary transfer unit 239 and the fixing unit 263 through the paper supply roller 294. Then, the secondary transfer unit 239 transfers the toner image formed on the intermediate transfer belt 233 to the print medium supplied from the paper feed cartridge 257, and the fixing unit 263 transfers the toner image transferred onto the print medium to the medium. To form a permanent image, and the print medium is discharged out of the printer 2.

  The cleaning unit 234 is provided between the primary transfer unit 226 and the charging unit 235, and has a cleaning blade 235 that comes into contact with the surface of the photoconductor 223, and development that remains on the photoconductor 223 after the primary transfer. The material (toner) is removed by the cleaning blade 235.

  The operation unit (operation means) is a part for the user to operate the image forming apparatus 200, and includes an operation display panel 271 and operation buttons. A device such as a touch panel is provided on the operation display panel 271, and the user touches the operation display panel 271 directly while referring to a UI (user interface) displayed on the operation display panel 271. The second operation can be performed. In the operation unit, various setting actions such as setting of printing conditions in the image forming apparatus 200 are possible.

  Next, a non-volatile storage element provided in a toner cartridge attached to the image forming apparatus will be described. Each toner cartridge stores developer color information, remaining amount information, and the like so that the controller of the image forming apparatus can recognize the state of the toner cartridge attached to the developing device. A memory element is provided.

  FIG. 3 is a diagram schematically showing the vicinity of the developing device of the image forming apparatus taking the tandem type according to the embodiment of the present invention as an example, and FIG. 4 is a rotary type according to the embodiment of the present invention. FIG. 2 is a diagram schematically illustrating the vicinity of a developing device of an image forming apparatus taking as an example.

  In FIG. 3, 311Y to 311K denote nonvolatile memories, and 312Y to 312K denote nonvolatile memory reader / writers. In FIG. 4, reference numerals 321Y to 321K denote nonvolatile memories, and 322 denotes a nonvolatile memory reader / writer.

  The non-volatile memories 311Y to 311K are attached to the developing devices 110Y to 110K, respectively. The remaining amount of toner, the cumulative use time of the toner cartridge, the number of fixings, the rotation time of the developing roller, the number of rotations of the photoconductor, the total operating time of the image forming apparatus main body, Information such as status information is stored. As a non-volatile memory for storing such information, any type of non-contact type non-volatile memory can be used. The non-volatile memories 321Y to 321K are provided in the toner cartridges 221K to 221Y, and similarly, the remaining amount of toner, the number of fixed sheets, the developing roller rotation time, the number of rotations of the photosensitive member, the total operation time of the image forming apparatus main body, and the user usage status Information such as information is stored.

  Information such as “toner remaining amount” and “toner cartridge cumulative usage time” is defined as information relating to consumption of consumables. In addition, information such as “fixed number of sheets”, “developing roller rotation time”, “photoconductor rotation number”, “image forming apparatus main body total operating time”, and “user usage status information” are information related to the operating status of the apparatus. Define.

  In the tandem type image forming apparatus, non-volatile memory reader / writers 312Y to 312K are arranged so as to correspond to the non-volatile memories 311Y to 311K as shown in the figure, and read / write to the non-volatile memories 311Y to 311K is performed. Can be done.

  In a rotary type image forming apparatus, a non-volatile memory reader / writer 322 is provided at a position as shown. In the rotary type, when the toner cartridge developed on the photoconductor 223 rotates and comes to the position shown in the figure, the nonvolatile memory provided in the cartridge and the nonvolatile memory reader / writer 322 communicate with each other. Then, reading / writing of the nonvolatile memory is performed.

  The read / write timings of the non-volatile memories 311Y to 311K and 321Y to 321K include immediately after the power of the image forming apparatus is turned on or immediately before and after the replacement / mounting of the toner cartridge. Examples of the read / write timing during the image process include after the latent image is formed on the photoconductor, after the development process, and after the fixing process.

  When the power of the image forming apparatus main body is turned off due to a power failure or user operation at a timing when predetermined information is written to the nonvolatile memories 311Y to 311K and 321Y to 321K, the writing to the nonvolatile memory is not completed. Sometimes. As a countermeasure against this, in the present invention, the developing roller in the developing device is provided with a power generation mechanism.

  Next, the configuration of the developing roller used in the developing device of the image forming apparatus according to the present embodiment will be described. The configuration of the developing roller is common to the developing device 110 of the tandem type image forming apparatus and the developing device 210 of the rotary type image forming apparatus.

  FIG. 5 is a view showing the developing roller of the image forming apparatus according to the embodiment of the present invention. FIG. 5 is a diagram in which the longitudinal direction of the developing roller is horizontal, and a part of the developing roller is viewed in cross section. In FIG. 5, 400 is a developing roller, 410 is an axial center portion, 411 is a coil portion, 412 is an axial center side first contactor, 413 is an axial center side second contactor, 417 is a first lead wire, 418. Denotes a second lead wire, 430 denotes a roller portion, 431 denotes a magnet portion, 450 denotes a takeout terminal, and 460 denotes a takeout terminal.

  The developing roller 400 is roughly composed of an axial center part 410 that is a fixed structure and a roller part 430 that is a rotating structure that rotates around the axial center part 410. The shaft center portion 410 is configured by a heat pipe, and a coil portion 411 is disposed around the shaft center portion 410. The heat pipe is an electrical insulator and a good heat conductor, and serves to conduct heat generated in the coil portion 411 to the outside of the developing roller 400. Such a heat pipe function prevents the toner that contacts the developing roller 400 from being melted or softened.

  A heat pipe is a container in which a small amount of working fluid is vacuum-sealed in an airtight container and a capillary structure is provided on the inner wall. A series of phase changes such as movement → condensation of steam at a low temperature part → circulation of the condensed liquid to the heating part due to capillary action occurs continuously, and heat can be quickly transferred. By using such a heat pipe as the shaft center portion 410, in the present invention, the temperature rise in the developing roller 400 accompanying power generation can be suppressed as much as possible.

  An axial center side first contact 412 and an axial center side second contact 413, which are electrical conductors, are provided at both ends of the axial center part 410, and the axial center side first contact 412 and the axial center part are provided. Each of the first lead wire 417 and the second lead wire 418 drawn from both ends of the coil portion 411 is connected to the side second contactor 413. An extraction terminal 450 and an extraction terminal 460 are connected to each of the axial center side first contact 412 and the axial center side second contact 413, and an electrical circuit (not shown) is connected to the extraction terminal 450 and the extraction terminal 460. It is connected.

  A function of supplying toner to the photoreceptors 123 and 223 is achieved by attaching toner to the outer periphery of the roller portion 430. On the other hand, a magnet portion 431 is fixed on the inner peripheral side of the roller portion 430, and as the roller portion 430 rotates around the shaft center portion 410, the magnet portion 431 also rotates together. Yes.

  When the image forming apparatus is configured with a developing device using magnetic toner, a magnet roll can be used as the magnet unit 431. When a non-magnetic toner is used in the developing device, a permanent magnet having an arbitrary shape / magnetization pattern can be used as the magnet portion 431. By rotating the magnet unit 431 configured as described above, the coil unit 411 is configured from an electric coil having an appropriate winding structure in which an electromotive force is generated in the coil unit 411. Such a coil portion 411 may be a single electric coil, a combination of a plurality of electric coils connected in series, a combination of a plurality of electric coils connected in parallel, or a plurality of electric coils. It may be a combination of serial connection and parallel connection. Moreover, you may comprise the electric coil of the coil part 411 with a spring lead.

  In the present invention, the electromotive force generated with the rotation of the developing roller 400 having the above-described configuration is stored in the secondary battery as power for power failure countermeasures when writing to the nonvolatile memory.

  Next, storage of electric power generated from the developing roller 400 configured as described above will be described. FIG. 6 is a diagram showing the configuration of the charging circuit of the image forming apparatus according to the embodiment of the present invention. FIG. 6 shows a charging circuit for charging the secondary battery 60 with the electric power generated by the developing roller 400. The charging circuit unit 60 includes a takeout terminal 450 of the developing roller 400, a rectifier circuit 53 connected to the takeout terminal 460, a smoothing circuit 54 connected to the output side thereof, and a DC-DC connected to the output side thereof. It is composed of a converter 55 and a secondary battery 60 (not shown) connected to the output side thereof. The secondary battery 60 is appropriately charged by the charging circuit configured as described above, and serves as a backup power source when the power is cut off at the read / write timing of the nonvolatile memories 311Y to 311K and 321Y to 321K. The

  Next, a backup circuit for using the stored secondary battery 60 as a backup when the power is cut off will be described. FIG. 7 is a diagram showing a configuration of a backup circuit of the image forming apparatus according to the embodiment of the present invention.

In the backup circuit shown in FIG. 7, the terminal A is connected to a memory writing circuit (not shown) that reads / writes the nonvolatile memories 311Y to 311K and 321Y to 321K. In this backup circuit, when the power supply voltage Vcc exceeds the Zener voltage of the Zener diode ZD, the transistor Q ₁ is turned on, the transistor Q ₂ is also turned on, and the power supply voltage Vcc is passed through the transistor Q _2. Power is supplied as a power source for a memory writing circuit (not shown).

When the power supply voltage Vcc becomes equal to or lower than the Zener voltage of the Zener diode ZD, the transistor Q ₁ is turned off and the transistor Q ₂ is also turned off, so that the power supply of the power supply voltage Vcc to the memory write circuit is cut off. At this time, the voltage of the memory writing circuit is temporarily supplied by discharging the secondary battery 60. Then, the memory writing circuit continues to read / write the nonvolatile memories 311Y to 311K and 321Y to 321K by the power of the secondary battery 60 for backup.

  Here, a case where the memory writing circuit continues to read / write the nonvolatile memories 311Y to 311K and 321Y to 321K with the backup power of the secondary battery 60 will be described. In the writing operation to the nonvolatile memory by the memory writing circuit, first, the concept of “items” in the nonvolatile memory will be described. “Item” is defined as a unit of information stored in the nonvolatile memories 311Y to 311K and 321Y to 321K. That is, the non-volatile memories 311Y to 311K and 321Y to 321K are “toner remaining amount”, “toner cartridge cumulative usage time”, “fixed number of sheets”, “developing roller rotation time”, “photosensitive member rotation count”, “image forming apparatus” Information such as “total operation time of the main body” and “user usage status information” is stored. Each piece of information is referred to as one item. Each of these items is usually information in units of 8 bits to 32 bits. The bit length of an item depends on the item.

  A problem in the writing operation of the nonvolatile memories 311Y to 311K and 321Y to 321K at the time of unexpected power loss such as a power failure is that writing of these one item (8 bits to 32 bits unit) itself is not completed. Therefore, when it is found that the power supply has dropped during the writing operation to the non-volatile memories 311Y to 311K and 321Y to 321K, the operation of the memory writing circuit by the secondary battery 60 for backup is limited to one item, and further writing is performed. Even if there is an item, control is performed so as not to perform this, so that an interruption during writing of one item is avoided.

  In the above embodiment, only the operation of the memory write circuit with the power of the backup secondary battery 60 has been described. However, such power can be used for other purposes. For example, there may be a use for informing the user of a display to the effect that not all processing has been performed due to power interruption on the operation panel unit of the image forming apparatus.

  In summary, according to the image forming apparatus and the method for controlling the image forming apparatus of the present invention, the power is turned off due to a power failure or user operation without complicating the circuit configuration or requiring complicated software processing. Even in such a case, the operation to the nonvolatile memory element can be completed with certainty. Further, according to the image forming apparatus of the present invention, since the power generation mechanism is provided in the developing roller, it is not necessary to separately provide a power generator, and the apparatus configuration is simplified.

1 is a cross-sectional view showing an overall configuration of an image forming apparatus taking a tandem type as an example according to an embodiment of the present invention. 1 is a cross-sectional view illustrating an overall configuration of an image forming apparatus taking a rotary type as an example according to an embodiment of the present invention. FIG. 3 is a diagram schematically illustrating the vicinity of a developing device of an image forming apparatus taking a tandem type as an example. FIG. 2 is a diagram schematically showing a vicinity of a developing device of an image forming apparatus taking a rotary type as an example. FIG. 3 is a diagram illustrating a developing roller of the image forming apparatus according to the embodiment of the present invention. 1 is a diagram illustrating a part of a circuit configuration of an image forming apparatus according to an embodiment of the present invention. 1 is a diagram illustrating a part of a circuit configuration of an image forming apparatus according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Image forming apparatus, 103 ... Housing, 105 ... Paper discharge tray, 107 ... Door body, 109 ... Exposure unit, 110 ... Developing apparatus, 111 ... Image forming unit , 113 ... Blower fan, 115 ... Transfer belt unit, 117 ... Paper feed unit, 119 ... Paper transport unit, 121Y, 121M, 121C, 121K ... Toner cartridge, 123 ... Photosensitive 125, corona charging means, 127 ... driving roller, 129 ... driven roller, 131 ... tension roller, 133 ... intermediate transfer belt, 134 ... cleaning means, 139 ... Secondary transfer roller 141... Cleaning blade 145... Polygon mirror motor 147... Polygon mirror 149. Scanner means 151... F-θ lens, 153... Reflection mirror, 155 .. folding mirror, 157... Feed cartridge, 161. ... Discharge roller pair, 167... Double-sided printing conveyance path, 169... Fixing roller pair, 200... Image forming apparatus, 209... Exposure unit, 210. 221M, 221C, 221K ... toner cartridge, 223 ... photoconductor, 225 ... charging unit, 233 ... intermediate transfer belt, 234 ... cleaning unit, 235 ... cleaning blade, 239 ... Secondary transfer unit, 257 ... feed cassette, 263 ... fixing unit, 271 ... operation display panel, 311Y-31 1K: non-volatile memory, 312Y-312K ... non-volatile memory reader / writer, 321Y-321K ... non-volatile memory, 322 ... non-volatile memory reader / writer, 400 ... developing roller, 410 ...・ Axis center part, 411... Coil part, 412... Axis part side first contactor, 413... Axis part side second contactor, 417... First lead wire, 418. Second lead wire, 430 ... roller portion, 431 ... magnet portion, 450 ... take-out terminal, 460 ... take-out terminal

Claims (6)

A developing roller comprising a rotating roller portion, a magnet portion provided on the inner periphery of the roller portion, a shaft center portion that does not rotate, and a coil portion provided on the outer periphery of the shaft center portion;
A secondary battery for storing an electromotive force generated in the coil portion of the developing roller;
A non-volatile memory element, and a memory writing circuit for writing to the non-volatile memory element;
Have
When the power is cut off, the memory writing circuit uses the secondary battery as a backup power source. The image forming apparatus according to claim 1, wherein the nonvolatile memory element is provided in a toner cartridge. The image forming apparatus according to claim 1, wherein information related to consumption of consumables is stored in the nonvolatile storage element. The image forming apparatus according to claim 1, wherein the nonvolatile storage element stores information relating to an operating state of the apparatus. The image forming apparatus according to claim 1, wherein the axial center portion is configured by a heat pipe. The image forming apparatus according to claim 1, wherein the coil portion is configured by an electric coil including a spring lead.

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