JP2008221755A - Image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that, when a device is driven by a battery and the battery runs out, capping of the nozzle surface of a recording head cannot be performed, resulting in such a discharge failure as not to be able to recover discharge due to the thickened ink within the nozzle. <P>SOLUTION: When monitoring the input voltage of an inkjet recording device 1 and the input voltage becomes insufficient, a capping drive part 8 is driven by power supplied from an input terminal 11, which inputs print information from an outer information processor 10 while canceling print operation, allowing a head capping means 7 to perform capping of the nozzle surface of the recording head 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image forming apparatus including a recording head that discharges droplets.

  In general, as a printer / fax / copier or an image forming apparatus combining these functions, for example, a liquid ejection apparatus including a recording head composed of a liquid ejection head that ejects liquid droplets of a recording liquid (liquid) is used. While conveying a medium (hereinafter also referred to as “paper”, the material is not limited, and a recording medium, a recording medium, a transfer material, and recording paper are also used synonymously) In some cases, an ink is attached to a sheet to form an image (recording, printing, printing, and printing are also used synonymously).

  Note that in this application, an image forming apparatus means an apparatus that forms an image by discharging a liquid onto a medium such as paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, or ceramic. The image formation means not only giving an image having a meaning such as a character or a figure to the medium but also giving an image having no meaning such as a pattern to the medium. In addition, the liquid is not limited to ink, and includes a patterning material, a DNA sample, other fluid, or powder that can be regarded as a fluid if it can be ejected. The liquid discharge apparatus means an apparatus that discharges liquid from a liquid discharge head, and is not limited to an apparatus that performs image formation.

As such an image forming apparatus, Patent Document 1 includes a fuel cell as a main power supply or auxiliary power supply, and Patent Document 2 can perform a recording operation by receiving power supply from a computer via a USB interface. In Patent Document 3, the remaining amount of battery power is detected and a maintenance operation is performed accordingly. In Patent Document 4, a rechargeable battery is provided, and a maintenance and recovery operation is performed by the rechargeable battery every predetermined time when the main power supply is not operated. Is described respectively.
Japanese Patent Laid-Open No. 2006-188793 JP 2002-036516 A JP 2005-169673 A Japanese Patent No. 3012691

  By the way, in the liquid discharge type image forming apparatus, a good image cannot be obtained unless the nozzle surface of the recording head is prevented from being dried and soiled. Therefore, a maintenance / recovery mechanism (apparatus) that normally includes a capping unit that covers the nozzle surface of the recording head, a wiping unit that wipes the nozzle surface, a suction unit that performs suction in the capped state, etc. in order to maintain and recover the performance of the nozzles of the recording head. ) And capping the nozzle surface of the recording head after the printing operation is completed.

  However, for example, when the image forming apparatus is operating with a battery (battery) or a vehicle-mounted battery (battery) as the main power supply instead of a commercial power supply, the power supply goes down and left as it is before capping the nozzle surface of the recording head. Then, there is a problem that the nozzle surface of the recording head is dried, the ink in the nozzle is thickened and clogged, and an ejection failure that cannot be recovered may occur.

  The present invention has been made in view of the above problems, and an object of the present invention is to prevent the nozzle surface of the recording head from being dried at least even when the main power source is down, and to prevent the occurrence of an ejection failure that cannot be recovered. .

  In order to solve the above-described problems, an image forming apparatus according to the present invention includes a recording head having a plurality of nozzles that discharge droplets, a capping unit that covers a nozzle surface on which the nozzles of the recording head are formed, and an external device. An input terminal to which printing information is input and power is supplied, and a means for performing capping by the capping means with the power supplied through the input terminal when power supply from the main power supply cannot be obtained. .

  Here, a configuration including an internal battery that supplies power for operating the entire apparatus, an external battery can be connected, and a configuration in which the entire apparatus operates with power supplied from the external battery.

  In addition, it is possible to provide a means for moving the carriage on which the recording head is mounted to a position corresponding to the capping means with power supplied through the input terminal. Further, the wiping means for cleaning the nozzle surface of the recording head, the suction means for performing suction while being capped by the capping means, and the wiping operation by the wiping means and the suction operation by the suction means are performed by the power supplied through the input terminal. And means.

  Further, it is possible to supply power to the heat generating means for keeping the recording liquid in the recording liquid cartridge with electric power supplied through the input terminal. In addition, it is possible to supply power to the medium heating means for warming the recording medium accommodated in the paper feeding means with the power supplied through the input terminal. Further, it is possible to supply power to the portion related to the reception operation of the facsimile communication unit with the power supplied through the input terminal.

  Moreover, it can be set as the structure provided with the means to output a warning when the remaining capacity of a battery becomes below predetermined amount. In this case, the means for outputting a warning can be configured to perform at least one of a warning display output to the operation unit, a warning sound output, and warning information transfer to an external terminal.

  Moreover, it can be set as the structure provided with the battery charged with the electric power supplied through an input terminal. In this case, the battery can be charged with power supplied from an external power source.

  Further, when the capping operation by the capping unit is performed with the power supplied through the input terminal, the operation speed can be made slower than when the capping operation by the capping unit is performed with the power supplied from the external power source.

  According to the image forming apparatus of the present invention, the input terminal to which print information is inputted from the outside and power is supplied and the power supplied through the input terminal when the power supply from the main power source cannot be obtained by the capping unit. And a means for performing a capping operation. Therefore, even when the main power source is down, it is possible to prevent the nozzle surface of the recording head from being dried at a minimum, and it is possible to prevent an ejection failure that cannot be recovered from occurring.

Embodiments of the present invention will be described below with reference to the accompanying drawings. A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram for explaining the embodiment, and FIG. 2 is a diagram for explaining a main part for explaining the capping means.
An ink jet recording apparatus 1 as an image forming apparatus includes, for example, a plurality of recording heads 4 having a plurality of nozzles for discharging droplets onto a carriage 3 that is guided by a guide rod 2 and moves and scans as shown in FIG. Then, a recording medium (not shown) is intermittently conveyed while moving the carriage 3 and a droplet is ejected from the recording head 4 to form a required image on the recording medium. For this reason, as shown in FIG. 1, each mechanism drive part (engine part) 5 which drives each mechanism, the printer control part 6 which controls each part, etc. are provided. Each mechanism driving unit 5 includes a capping driving unit 8 that drives a capping unit 7 (see FIG. 2) configured by a shutter member that covers the nozzle surfaces (surfaces on which the nozzles are formed) of the recording heads 4. Means for driving a drive source such as a solenoid for moving the means 7 back and forth is provided.

  In the ink jet recording apparatus 1, print information from an external information processing apparatus (PC) 10 such as a personal computer is input to an input terminal 11, and the print information input to the input terminal 11 is given to a printer control unit 6. As described above, an image forming operation is performed. Further, power is supplied to the input terminal 11 from the information processing apparatus (PC) 10. For example, a USB interface or the like can be used as the input terminal 11.

  The ink jet recording apparatus 1 is supplied with electric power from an external power source 20 and is supplied with power to an internal in-machine power supply mechanism 21, and the in-machine power supply mechanism 21 supplies necessary power to each mechanism driving unit 5, printer control unit 7, and the like. Is fed. In addition, power supplied from the external information processing apparatus 10 via the input terminal 11 is also given to the in-machine power supply mechanism 21. The power supply mechanism 21 switches the power feeding circuit to the emergency battery by the automatic power switching circuit when the external power supply 20 is cut off.

Control of the ink jet recording apparatus configured as described above will be described with reference to FIG.
The external information processing apparatus 10 starts monitoring the input voltage of the inkjet recording apparatus 1, determines whether the input voltage is sufficient for the required amount, and if the input voltage is sufficient for the required amount, the printing operation Then, the nozzle surface of the recording head 4 is capped by the capping means 7 to complete the operation. On the other hand, if the input voltage is not sufficient for the required amount, the capping driving unit 8 is canceled by the power supplied from the input terminal 11 for canceling the printing operation and inputting the print information from the external information processing apparatus 10. The nozzle surface of the recording head 4 is capped by driving the head capping means 7.

  As a result, even when the main power supply is shut down, the nozzle surface of the recording head can be prevented from being dried at the minimum, and an ejection failure that cannot be recovered can be prevented.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram for explaining the embodiment.
In this embodiment, an internal battery 22 is provided as a main power source for operating the entire inkjet recording apparatus 1. Therefore, when the potential of the internal battery 22 is lowered, the capping drive unit 8 is driven by the power supplied from the input terminal 11 for inputting print information from the external information processing apparatus 10 as in the first embodiment, and the head The nozzle surface of the recording head 4 is capped by the capping means 7, and the apparatus can be stopped in a state where drying of the nozzle surface of the recording head is prevented.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram for explaining the embodiment.
In this embodiment, an in-vehicle battery 23 is provided outside as a main power source for operating the entire inkjet recording apparatus 1. Therefore, when the potential of the in-vehicle battery 23 is lowered, as in the first embodiment, the capping driving unit 8 is driven by the power supplied from the input terminal 11 for inputting the print information from the external information processing apparatus 10, The nozzle surface of the recording head 4 is capped by the head capping means 7 and the apparatus can be stopped in a state where drying of the nozzle surface of the recording head is prevented.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a block diagram for explaining the embodiment, and FIG. 7 is a diagram for explaining a main part for explaining the maintenance / recovery mechanism.
In this embodiment, as shown in FIG. 7, the maintenance / recovery mechanism 31 of the recording head 4 includes a cap member 32 as a capping unit corresponding to each recording head 4 held by the cap holder 33. Each cap member 32 caps the nozzle surface of the recording head 4 by the cap holder 33 being raised by the internal capping drive unit 8.

  As shown in FIG. 6, the capping drive unit 8 of the maintenance / recovery mechanism 31 is provided with a carriage drive unit 35 that moves the carriage 3 to a position corresponding to the maintenance / recovery mechanism 31. The carriage driving unit 35 performs moving scanning of the carriage 3 in the main scanning direction during normal printing.

Control of the thus configured ink jet recording apparatus will be described with reference to FIG.
The external information processing apparatus 10 starts monitoring the input voltage of the inkjet recording apparatus 1, determines whether the input voltage is sufficient for the required amount, and if the input voltage is sufficient for the required amount, the printing operation The carriage 3 is moved to the position of the maintenance / recovery mechanism 31 by the carriage drive unit 35 (the state shown in FIG. 7A), and then the cap holder 33 of the maintenance / recovery mechanism 31 is raised by the capping drive unit 5 The nozzle surface of the recording head 4 is capped by 32 (the state shown in FIG. 7B), and the operation ends. On the other hand, if the input voltage is not sufficient for the required amount, the carriage driving unit 35 uses the power supplied from the input terminal 11 for canceling the printing operation and inputting the print information from the external information processing apparatus 10. The carriage 3 is moved to the position of the maintenance / recovery mechanism 31 (the state shown in FIG. 7A), and then the cap holder 33 of the maintenance / recovery mechanism 31 is lifted by the capping drive unit 5 and the nozzle surface of the recording head 4 by the cap member 32. To stop the operation.

  As a result, even when the main power supply is shut down, the nozzle surface of the recording head can be prevented from being dried at the minimum, and an ejection failure that cannot be recovered can be prevented.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 9 is an explanatory block diagram for explaining the embodiment, and FIG. 10 is an explanatory view of a main part for explaining the maintenance / recovery mechanism.
In this embodiment, as shown in FIG. 10, the maintenance / recovery mechanism 31 of the recording head 4 includes a cap member 32 corresponding to each recording head 4 held by the cap holder 33 and a recording head 4 held by the wiper holder 37. A wiping member 36 is provided as a wiping means for wiping and cleaning the nozzle surface, and a suction pump 38 is provided as a suction means for performing suction while being capped by the cap member 32.

  As shown in FIG. 9, the capping drive unit 8 and the carriage drive unit 35 of the maintenance / recovery mechanism 31 are provided with a wiping drive unit 39 that raises the wiper holder 37 and a suction pump drive unit 40 that drives the suction pump 38. The capping drive unit 8, the wiping drive unit 39, and the suction pump drive unit 40 may be a single drive unit.

Control of the thus configured ink jet recording apparatus will be described with reference to FIG. FIG. 11 is a flowchart for explaining control during standby, and is the same as FIG. 3 described above during normal printing.
First, during standby, it is determined whether or not the elapsed time from the previous printing is less than or equal to a predetermined time until the ink is solidified. If the elapsed time is less than or equal to the predetermined time, the process shifts to a standby state. On the other hand, if the elapsed time exceeds the predetermined time, the external information processing apparatus 10 starts monitoring the input voltage of the ink jet recording apparatus 1 and determines whether or not the input voltage is sufficient for the required amount. .

  At this time, if the input voltage is sufficient with respect to the required amount, the suction pump 38 is operated with normal power to perform the head suction operation (with the cap member 32 having a negative pressure in the state where the nozzle surface is capped with the cap member 32). The operation of sucking ink from the nozzle (FIG. 10B) is performed, the cap member 32 is lowered, the wiping member 36 is raised with normal power, and the carriage 3 is moved relative to the wiping member 36. A wiping operation (FIGS. 10C to 10E) for wiping the nozzle surface is performed, and then the cap member 32 is raised with normal power to cap the nozzle surface.

  On the other hand, if the input voltage is not sufficient with respect to the required amount, the suction pump drive unit 40 is driven by the power supplied from the input terminal 11 for inputting the print information from the external information processing apparatus 10 to suck the suction pump. 38, the head suction operation is performed, the wiping drive unit 39 is driven by the power supplied from the input terminal 11 to raise the wiping member 36, and the carriage drive unit 35 is driven by the power supplied from the input terminal 11. The wiping operation is performed by driving the carriage 3 relative to the wiping member 36, and then the capping driving unit 8 is driven by the power supplied from the input terminal 11 to raise the cap member 32, and the nozzle surface Capping.

  As a result, not only during printing, but also when the main power supply goes down during standby, head suction, wiping, and capping can be performed to prevent the nozzle surface from being dried, thereby preventing ejection failures that cannot be recovered from occurring.

Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 12 is a block diagram for explaining the embodiment.
In this embodiment, there is provided an ink heat retaining heater 41 which is a heat generating means for retaining the ink that is the recording liquid of the recording liquid cartridge.

Control of the thus configured ink jet recording apparatus will be described with reference to FIG. FIG. 13 is a flowchart for explaining control during standby, and is the same as FIG. 3 described above during normal printing.
First, during standby, the external information processing apparatus 10 starts monitoring the input voltage of the inkjet recording apparatus 1, and determines whether the input voltage is sufficient for the required amount. At this time, if the input voltage is sufficient for the required amount, the ink heat retaining heater 41 is supplied with normal power to generate heat. On the other hand, if the input voltage is not sufficient with respect to the required amount, the ink heat retaining heater 41 is supplied with power supplied from the input terminal 11 for inputting the print information from the external information processing apparatus 10 to generate heat. .

  Thus, it is possible to keep the ink warm when the main power supply goes down even during standby.

Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 14 is a block diagram for explaining the embodiment.
In this embodiment, a sheet cassette cassette heater 42 is provided as a heating unit for heating a recording medium accommodated in a sheet cassette serving as a sheet feeding unit.

Control of the thus configured ink jet recording apparatus will be described with reference to FIG. FIG. 15 is a flowchart for explaining the control during standby, and is the same as FIG. 3 described above during normal printing.
First, during standby, the external information processing apparatus 10 starts monitoring the input voltage of the inkjet recording apparatus 1, and determines whether the input voltage is sufficient for the required amount. At this time, if the input voltage is sufficient for the required amount, the sheet feeding cassette heater 42 is fed with normal power to generate heat. On the other hand, if the input voltage is not sufficient with respect to the required amount, heat is generated by supplying power to the paper cassette cassette heater 42 with the power supplied from the input terminal 11 for inputting print information from the external information processing apparatus 10. Let

  As a result, the recording medium in the paper feed cassette can be maintained at a required temperature when the main power supply is down during standby.

Next, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 16 is a block diagram for explaining the embodiment.
In this embodiment, a facsimile receiving unit 43 that performs facsimile reception is provided.

Control of the thus configured ink jet recording apparatus will be described with reference to FIG. FIG. 17 is a flowchart for explaining the control during standby, and is the same as FIG. 3 described above during normal printing.
First, during standby, the external information processing apparatus 10 starts monitoring the input voltage of the inkjet recording apparatus 1, and determines whether the input voltage is sufficient for the required amount. At this time, if the input voltage is sufficient for the required amount, the facsimile receiving unit 43 is operated with normal power. On the other hand, if the input voltage is not sufficient for the required amount, the facsimile receiving unit 43 operates with power supplied from the input terminal 11 for inputting print information from the external information processing apparatus 10.

  Thus, facsimile reception can be performed when the main power supply is down even during standby.

Next, a ninth embodiment of the present invention will be described with reference to FIG. FIG. 18 is a flowchart for explaining the standby control for explaining the embodiment, and is the same as FIG. 3 described above during normal printing.
In this embodiment, in the configuration of the second and third embodiments, monitoring of the input voltage of the inkjet recording apparatus 1 is started by the external information processing apparatus 10 during standby, and is the input voltage sufficient for the required amount? Determine whether or not. At this time, if the input voltage is sufficient for the required amount, the standby state is continued as it is. On the other hand, if the input voltage is not sufficient for the required amount, a warning message “Input voltage is insufficient. Do not disconnect the PC.” Will be displayed on the operation unit (not shown). To continue waiting.

  Accordingly, it is possible to prevent the information processing apparatus from being disconnected and not being able to supply power from the input terminal when the outside of the main power supply goes down during standby.

Next, a tenth embodiment of the present invention will be described with reference to FIG. FIG. 19 is a flowchart for explaining the standby control for explaining the embodiment, and is the same as FIG. 3 described above during normal printing.
In this embodiment, in the configuration of the second and third embodiments, monitoring of the input voltage of the inkjet recording apparatus 1 is started by the external information processing apparatus 10 during standby, and is the input voltage sufficient for the required amount? Determine whether or not. At this time, if the input voltage is sufficient for the required amount, the standby state is continued as it is. On the other hand, if the input voltage is not sufficient for the required amount, a warning sound is output through a warning sound generating means (not shown) and the standby state is continued.

  Accordingly, it is possible to prevent the information processing apparatus from being disconnected and not being able to supply power from the input terminal when the outside of the main power supply goes down during standby.

Next, an eleventh embodiment of the present invention will be described with reference to FIG. FIG. 20 is a flowchart for explaining the standby control for explaining the embodiment, and is the same as FIG. 3 described above during normal printing.
In this embodiment, in the configuration of the second and third embodiments, monitoring of the input voltage of the inkjet recording apparatus 1 is started by the external information processing apparatus 10 during standby, and is the input voltage sufficient for the required amount? Determine whether or not. At this time, if the input voltage is sufficient for the required amount, the standby state is continued as it is. On the other hand, if the input voltage is not sufficient for the required amount, a warning message “Input voltage is insufficient. Do not disconnect from the PC” is displayed on the external information processing apparatus 10. Display output and continue standby.

  Accordingly, it is possible to prevent the information processing apparatus from being disconnected and not being able to supply power from the input terminal when the outside of the main power supply goes down during standby.

Next, a twelfth embodiment of the present invention will be described with reference to FIG. FIG. 21 is an explanatory block diagram illustrating the embodiment.
In this embodiment, a battery 51 charged with electric power supplied from an input terminal 11 for inputting print information from the external information processing apparatus 10 is provided inside the inkjet recording apparatus apparatus 1.

  As a result, when the main power source is down, the capping operation can be performed by switching to the power supply from the battery 51, and a more stable capping operation can be performed.

Next, a thirteenth embodiment of the present invention will be described with reference to FIG. FIG. 22 is an explanatory block diagram illustrating the embodiment.
In this embodiment, a battery 51 that is charged with power supplied from an input terminal 11 for inputting print information from the external information processing apparatus 10 is provided inside the inkjet recording apparatus apparatus 1, and the battery 51 is further connected to an external power supply 20. The battery is charged with power from

  As a result, when the main power source is down, the capping operation can be performed by switching to the power supply from the battery 51, a more stable capping operation can be performed, and the battery 51 can be charged reliably.

It is block explanatory drawing explaining 1st Embodiment of this invention. It is principal part explanatory drawing explaining a capping means similarly. It is a flowchart similarly provided for operation | movement description. It is block explanatory drawing explaining 2nd Embodiment of this invention. It is block explanatory drawing explaining 3rd Embodiment of this invention. It is block explanatory drawing explaining 4th Embodiment of this invention. It is a principal part explanatory drawing similarly explaining a maintenance recovery mechanism. It is a flowchart similarly provided for operation | movement description. It is block explanatory drawing explaining 5th Embodiment of this invention. It is a principal part explanatory drawing similarly explaining a maintenance recovery mechanism. It is a flowchart similarly provided for operation | movement description. It is block explanatory drawing explaining 6th Embodiment of this invention. It is a flowchart similarly provided for operation | movement description. It is block explanatory drawing explaining 7th Embodiment of this invention. It is a flowchart similarly provided for operation | movement description. It is block explanatory drawing explaining 8th Embodiment of this invention. It is a flowchart similarly provided for operation | movement description. It is a flowchart with which it uses for description of 9th Embodiment of this invention. It is a flowchart with which it uses for description of 10th Embodiment of this invention. It is a flowchart with which it uses for description of 11th Embodiment of this invention. It is block explanatory drawing explaining 12th Embodiment of this invention. It is block explanatory drawing explaining 13th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Inkjet recording device 3 ... Carriage 4 ... Recording head 5 ... Each drive mechanism part 6 ... Printer control part 7 ... Capping means 8 ... Capping drive part 10 ... External information processing apparatus 11 ... Input terminal 20 ... External power supply 21 ... Internal battery 22 ... Battery for vehicle use

Claims (13)

A recording head having a plurality of nozzles for discharging droplets;
Capping means for capping the nozzle surface on which the nozzles of the recording head are formed;
An input terminal for inputting print information from the outside and supplying power;
An image forming apparatus comprising: a capping unit that drives the capping unit with electric power supplied through the input terminal when power cannot be supplied from a main power source.   2. The image forming apparatus according to claim 1, further comprising an internal battery that supplies electric power for operating the entire apparatus.   3. The image forming apparatus according to claim 1, wherein an external battery is connectable, and the entire apparatus is operated with electric power supplied from the external battery.   4. The image forming apparatus according to claim 1, further comprising means for moving a carriage on which the recording head is mounted to a position corresponding to the capping means with electric power supplied through the input terminal. An image forming apparatus.   5. The image forming apparatus according to claim 1, wherein the wiping unit that cleans the nozzle surface of the recording head, the suction unit that performs suction while being capped by the capping unit, and the input terminal are supplied. An image forming apparatus comprising: a wiping operation performed by the wiping device and a suction operation performed by the suction device.   4. The image forming apparatus according to claim 1, wherein power is supplied to heat generating means for keeping the recording liquid in the recording liquid cartridge with electric power supplied through the input terminal.   4. The image forming apparatus according to claim 1, wherein power is supplied to a medium heating unit that heats a recording medium accommodated in a sheet feeding unit with power supplied through the input terminal. Image forming apparatus.   4. The image forming apparatus according to claim 1, wherein power is supplied to a portion related to a reception operation of the facsimile communication unit with electric power supplied through the input terminal.   4. The image forming apparatus according to claim 2, further comprising means for outputting a warning when the remaining capacity of the battery becomes a predetermined amount or less.   10. The image forming apparatus according to claim 9, wherein the warning output unit outputs at least one of a warning display to an operation unit, a warning sound, and a warning information transfer to an external terminal. Image forming apparatus.   2. The image forming apparatus according to claim 1, further comprising a battery charged with electric power supplied through the input terminal.   The image forming apparatus according to claim 11, wherein the battery is charged by power feeding from an external power source.   13. The image forming apparatus according to claim 1, wherein when capping by the capping unit is performed with power supplied through the input terminal, capping by the capping unit is performed with power supplied from a main power source. An image forming apparatus characterized in that the operation speed is made slower than that.

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