JPH06332581A - Power source control method and printer - Google Patents

Abstract

PURPOSE:To prevent the excess power consumption by cutting the power supply to the device when the situation where the power supply to the device is invalid continues for a prescribed time. CONSTITUTION:When an abnormality occurs in a laser beam printer 100, an error processing part 6 detects it. The error processing part 6 executes the prescribed processing such as reporting the prescribed error generation and passes the error information to a power supply control part 7. When the power supply control part 7 accepts the error information, whether or not the abnormal state continues for the prescribed time is judged and when the abnormal state continues for the perscribed time, it outputs a power supply OFF instruction to a power supply part 8. The power supply part 8 cuts the power to each section by the power supply OFF instruction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control method for an apparatus used by connecting to an external apparatus, and a printing apparatus using the power supply control method.

[0002]

2. Description of the Related Art A printer is one of the peripheral devices used by being connected to a host computer or the like. In a conventional printing device, when an error occurs in the printing device itself or in its printing operation, the printing device uses a liquid crystal panel or L
Notify the user that an error has occurred using a display such as an ED. However, if the operation for canceling the error is not performed by the user, the error state will continue, and during that time, a large amount of power will be consumed.

In the conventional printing apparatus, the user must switch ON / OFF the power supply with a switch. Then, in the printing apparatus, a large amount of power is constantly consumed in order to keep the warmed-up state even when the printing process is not being executed. for that reason,
If the user forgets to turn off the power, a lot of useless power will be consumed.

[0004]

Recently, the printing apparatus is increasingly used in a network environment, and the printing apparatus is often installed in a place distant from the user. In such a case, even if there is something wrong with the printing apparatus and an error occurs, the user often does not notice immediately because the printing apparatus is away. There is also a system that informs the user of an abnormality that occurred in the printing device via the host computer, but in many cases the user does not constantly monitor the host computer, and in the end an error occurs and it is left for a long time. The situation occurs, and useless power is consumed until the user notices. This is problematic in terms of energy saving.

Further, in the above-mentioned conventional example, when the power supply of the printing device is ON but the external device is not connected, or the power supply of the connected external device is OFF, that is, the data is sent to the printing device. Even if there is absolutely no possibility that a message will be transmitted, there is a problem in terms of energy saving because a lot of useless power is consumed.
For example, a printing device used in a network environment is often installed in a place apart from an external device (host computer). Therefore, it is often the case that the user turns off the power of the external device but forgets to turn off the power of the printing device.

As described above, in the conventional printing apparatus,
Even if the printer is left in an error-free state, or if it is left in a state in which it cannot be used because the power of the host computer has been cut off, etc. There is a problem that the printing apparatus continues to consume power unless the power is turned off.

Although the above description has been made by taking the printing apparatus as an example, other peripheral apparatuses connected to the host computer and used have the same problem.

The present invention has been made in view of the above problems, and when the state in which the power supply to the device is meaningless continues for a predetermined time, the power supply to the device is cut off. Accordingly, it is an object of the present invention to provide a power supply control method and a printing apparatus capable of preventing wasteful power consumption.

[0009]

The power supply control method according to the present invention for achieving the above object comprises the following steps. That is, a power supply control method for a device used by connecting to an external device, the detection step of detecting that the device is in an abnormal state, and whether the abnormal state detected in the detection step has continued for a predetermined time. It is characterized by further comprising a judging step for judging whether or not the abnormal state has continued for a predetermined time in the judging step, and a shutoff step for shutting off power supply to the apparatus.

A printer according to the present invention for achieving the above object has the following construction. That is, a printing device having a recording unit for inputting print data from an external device and performing recording on a recording medium based on the print data, the detecting device detecting an abnormal state of the device, Judgment means for judging whether or not the abnormal state detected by the detection means has continued for a predetermined time, and cutoff for cutting off the power supply to the device when the abnormal state has been judged by the judgment means for a predetermined time. And means.

[0011]

With the above configuration, when some abnormality occurs in the device and the abnormal state continues for a predetermined time, the power supply to the device is cut off after storing the information of the abnormality in the storage medium. Useless power consumption by the device is prevented.

[0012]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

<First Embodiment> [Description of Laser Beam Printer (FIG. 1)] Before describing the configuration of the present embodiment, the configuration of a laser beam printer to which the present embodiment is applied will be described with reference to FIG. .

FIG. 1 is a sectional view showing the internal structure of a laser beam printer (hereinafter abbreviated as LBP) of this embodiment. In FIG. 1, reference numeral 100 denotes an LBP main body, which inputs and stores character information (character code), form information, macro commands, etc. supplied from an external device (described later in FIG. 2) connected to the outside. A corresponding character pattern, form pattern, or the like is created according to the information, and an image is formed on a recording paper, which is a recording medium. 10
Reference numeral 1 denotes an operation panel on which switches and LEDs for operation, a display and the like are arranged, and 1 is a control unit for controlling the entire LBP 100 and analyzing character information supplied from an external device. The control unit 1 mainly converts the character information into a video signal of a corresponding character pattern and converts the character signal into a video signal.
Output to 02.

The laser driver 102 is a semiconductor laser 10.
3 is a circuit for driving the laser beam 3, and the laser beam 1 emitted from the semiconductor laser 103 according to the input video signal.
Switch 04 on / off. The laser light 104 is swung in the left-right direction by the rotary polygon mirror 105 to scan the electrostatic drum 106. As a result, an electrostatic latent image having a character pattern is formed on the electrostatic drum 106. The latent image is developed by the developing unit 107 arranged around the electrostatic drum 106, and then transferred to the recording paper. A cut sheet is used as the recording sheet, and the cut sheet recording sheet is LBP100.
The sheet is stored in the sheet cassette 108 attached to the sheet cassette, is taken into the apparatus by the sheet feeding roller 109 and the conveying rollers 110 and 111, and is supplied to the electrostatic drum 106.

[Description of Printer Control System (FIG. 2)] FIG. 2 is a block diagram showing a schematic configuration of a control system of the laser beam printer shown in FIG. In the figure, reference numeral 2 denotes an external device, which transmits print data and the like to the LBP 100. Reference numeral 8 denotes a power supply unit that supplies necessary power to each unit of the LBP 100. A printing mechanism unit 9 executes recording on a recording medium (recording paper) based on the image data output from the control unit. The printing mechanism unit 9 in this example employs the laser beam method as described above. Reference numeral 11 denotes a storage device, which stores error information and the like described later. The storage device 11
Is composed of a non-volatile memory (hard disk, floppy disk, etc.) that retains its stored contents even if power is not supplied.

An input interface 21 inputs various data from the external device 2. A CPU 22 controls the entire control unit 1. 23 is a ROM,
Various control programs executed by the CPU 22, character font patterns, etc. are stored. 24 is a RAM,
A reception buffer 24a for storing print data sent from the external device 2, a bitmap memory 24b for storing image data obtained by expanding the print data,
The CPU 22 includes a work area 24c and the like necessary for executing the control program. An output interface 25 is an interface for outputting the image data stored in the bitmap memory 24b to the printing mechanism unit 9. 26 is a device interface,
Data communication between the power supply unit 8 and the storage device 11 and the CPU 22 is executed. The above-described respective constituent elements in the control unit 1 are connected to the system bus 31, and exchange data with each other.

The processing operation of the control unit 1 in the first embodiment in the LBP 100 having the above-mentioned configuration will be described. FIG. 3 is a block diagram showing the functional configuration of the control unit 1 in the first embodiment.

First, the operation when the printing apparatus and the printing process operate normally will be described with reference to the block diagram of FIG. In the input unit 3, the print data output from the external device 2 such as a host computer is received via the input interface 21 and stored in the reception buffer 24a. Next, the print data analysis unit 4 analyzes the received data stored in the reception buffer 24a, generates image data in the bitmap format, and stores the image data in the bitmap memory 24b. Then, the output unit 5 outputs the image data generated by the print data analysis unit 4 to the printing mechanism unit 9 from the output interface 25 as a video signal for ON / OFF control of the laser beam. The printing mechanism unit 9 prints on a recording medium 10 such as recording paper by a laser beam method.

Next, the operation of the printing process when an error occurs in the control unit 1 or the printing mechanism unit 9 will be described.

Each of the input unit 3, the print data analysis unit 4, the output unit 5, and the print mechanism unit 9 constantly monitors whether an error has occurred during the printing process, and when an error is detected, This is notified to the error processing unit 6. An error detected in the control unit 1 may be a data transfer error or the like. Further, as the error detected by the printing mechanism section 9, there are no recording paper, jamming of the recording paper (paper jam), failure of the transport motor, and the like. still,
“No recording paper” or the like may be configured to be constantly monitored not only during printing processing.

When the error processing unit 6 receives the information indicating that the error has occurred, the error processing unit 6 executes the process corresponding to the generated error and also generates the error information and transfers it to the power supply control unit 7 (FIG. 5). (See below in the flow chart). still,
The data structure of the error information generated by the error processing unit 6 is shown in FIG. As shown in the figure, the error information 40 includes an error flag 41 indicating that an error is occurring and an error type 42 indicating the content of the error. Upon receiving the error information, the power supply controller 7 starts measuring time. Then, if the error clearing operation is not performed within the predetermined time, the error information is stored in the storage device 11 and the power supply unit 8 is controlled to control the L level.
The power supply to the BP 100 is cut off (described later in the flowchart of FIG. 6).

Further, when the power is turned on again, the power control unit 7 checks the error flag 41 of the error information 40 stored in the storage device 11, and this error flag 41
The CPU 22 switches the start-up process according to the state (see below in the flowchart of FIG. 7).

The above operation will be described in more detail with reference to the flowcharts of FIGS.

FIG. 5 is a flowchart showing the processing procedure of the error processing unit 6. First, in step S1, it is determined whether an error has occurred. If no error has occurred, step S1 is repeated. On the other hand, if an error has occurred, the process proceeds to step S2. Error processing is executed in steps S2 and S3. First, in step S2, processing for shifting to an error state is performed. Specifically, the input of print data from the external device 2 is stopped, or if the paper ejection operation is in progress, the paper ejection is completed.
Further, in step S3, the fact that an error has occurred and the content thereof are displayed by a display device, an LED or the like. In step S4, the error information 40 described with reference to FIG. 4 is generated, and in step S5, the power control unit 7 outputs the error information 40.
Pass to.

FIG. 6 is a flow chart showing the operation procedure of the power supply control unit 7. When the power supply control unit 7 receives error information, it controls the power supply unit 8 by the algorithm shown in FIG.

First, in step S11, it is judged whether or not the error information 40 is received from the error processing section 6,
When the error information 40 is received, the process proceeds to step S12.
By the processing from step S12 to step S14, it is determined whether or not the error releasing operation is executed within the predetermined time. Time measurement is started in step S12, and step S1
In step 3, it is determined whether the error clearing operation has been executed. If the error canceling operation has been executed, this means that the error canceling operation has been performed within the predetermined time, so the processing is ended. On the other hand, if the error releasing operation has not been executed, the process proceeds to step S14, and it is determined whether or not a predetermined time has elapsed since the time measurement was started in step S12. If the predetermined time has not elapsed, the process returns to step S13 and the above processing is repeated. On the other hand, if it is determined in step S14 that the predetermined time has elapsed, it means that the error canceling operation has not been executed within the predetermined time, and thus step S15
Go to.

In step S15, the error information 40 is stored in the storage device 11. Then, in step S16, the power supply unit 8 is commanded to stop the power supply (power OFF command), and the power supply is cut off.

Next, the operation when the user turns on the power again after the power is turned off as described above will be described. FIG. 7 is a flowchart showing an algorithm when the power of the LBP 100 is turned on.

When the power is turned on, first, in step S21, the error information 40 stored in the storage device 11 is read and the error flag 41 is checked to determine whether the power has been turned off because the error occurrence state has continued for a predetermined time. To judge. Here, if it is determined that the power is turned off by a normal switch operation, step S22
Then, the normal start-up process is performed. If the power is turned off because the error state has continued for the predetermined time, the process proceeds to step S9, and the LBP1 is determined based on the error type 42 of the error information 40 read from the storage device 11.
00 starts up when an error occurs.

<Second Embodiment> In the first embodiment, the error flag information 40 stores only the error flag 41 and the error type 42 in the storage device 11 and turns off the power.
The print data being processed will be lost. This can be used for errors that cannot be cleared immediately, such as errors due to the failure of parts such as motors. However, there is an error such as paper jam in which printing should be restarted without missing data when the user performs an error cancel operation.

In order to deal with this, in the second embodiment, the storage device 11 is equipped with a hard disk to save the print data. In this case, step S of the first embodiment
15 (FIG. 6), the error information 40 is stored in the storage device 11
Printing data stored in the receiving buffer 24a and the bitmap memory 24b while being stored in the storage device 1
Save to 1. Then, in step S6, a power OFF command is passed to the power supply unit 8. Then, the power supply unit 8 turns off the power supply of the printing apparatus.

When the power is turned on in this state, the printing apparatus reads the error information 40 from the storage device 11 and starts up in the error occurrence state. Then, when the error canceling operation is performed, the printing data saved in the hard disk is read and stored in the reception buffer 24a and the bitmap memory 24b, and the printing operation is restarted. The storage device 11 for saving the printing data is not limited to the hard disk, and may be any storage device that does not lose its memory even when the power supply is turned off.

As described above, according to the first and second embodiments, the power of the printing apparatus is automatically turned off when no operation is performed for a predetermined time after an error occurs in the printing apparatus. By doing so, it is effective in reducing wasteful consumption of electric power. Also, when the power is automatically turned off, the error state is retained when the power is turned on, so that the user can perform an appropriate operation on the printing apparatus.

In the above-described first and second embodiments, the power-off is controlled depending on whether or not any release operation is started within a predetermined time from the time when the error occurs, but the invention is not limited to this. For example, the power-off may be controlled depending on whether the error state is released within a predetermined time from the time when the error occurs.

<Embodiment 3> In Embodiments 1 and 2 described above, a printing apparatus is described which controls power-off when the printing apparatus is left in an error state. Example 3
Then, the power of the external device such as the host computer is turned off.
A printing device that performs power supply cutoff control in the case of the above will be described. Since the configuration of the LBP of the third embodiment and the schematic configuration of its control system are the same as those of the first embodiment shown in FIGS. 1 and 2, the description thereof is omitted here. Further, in the third embodiment, the storage device 11 in the block diagram of FIG. 2 may be omitted.

FIG. 8 is a block diagram showing the functional arrangement of the control unit in the third embodiment. In the figure, the same components as those in FIG. 3 are designated by the same reference numerals. The operation of the normal print processing is the same as that in the first embodiment, and the description thereof is omitted here. The power control unit 16 turns on / off the power of the external device 2.
Monitor the OFF state. And the power supply OF of the external device 2
When the F state continues for a predetermined time, a power OFF command is output to the power supply unit 8 to stop the power supply to the LBP 100.

In general, the external device 2 and the input section 3 are connected via an interface cable. The power supply control unit 16 uses the interface cable connected to
A signal indicating the ON / OFF state of the power supply of the external device,
Alternatively, constantly monitor signals that could be an alternative. For example, when the external device 2 and the LBP 100 are connected by the Centronics interface, the “power ON / OFF signal” of pin 18 is monitored.

The power supply control unit 16 further has a function of measuring time, and when the power of the external device 2 remains off for a predetermined time, the power supply unit 8 is commanded to turn off the power of the LBP 100 (power supply). Send the OFF command). Power supply 8
Immediately after receiving the power OFF command from the power control unit 16, the power supply to each unit of the LBP 100 is cut off.

FIG. 9 is a flowchart showing the algorithm of the power supply control process of the power supply control unit 16 in the third embodiment. First, in step S31, the ON / OFF state of the power supply of the external device 2 is monitored, and the power supply of the external device 2 is turned off.
If it is confirmed to be F, time measurement is started in step S32. Subsequent Step S33 and Step S34
Then, it is determined whether or not the power-off state of the external device 2 has continued for a predetermined time.

First, in step S33, it is determined whether or not the power source of the external device 2 is in the ON state, and if it is in the ON state, it is determined that the OFF state has not continued for a predetermined time and the process returns to step S31. On the other hand, if it is not in the ON state, the process proceeds to step S34, and it is determined whether or not a predetermined time has elapsed since the time measurement was started in step S32. If the predetermined time has not elapsed, the process returns to step S33. On the other hand, if it is determined in step S34 that the predetermined time has passed, it is determined that the OFF state has continued for the predetermined time, and the process proceeds to step S35. In step S35, a power OFF command is output to the power supply unit 8 to cut off the power supply to each unit of the LBP 100.

<Fourth Embodiment> Further, in the third embodiment described above,
When the power supply control unit 16 outputs a power OFF command to the power supply unit 8, the power supply to the LBP 100 is completely cut off. In this case, the user must operate the power switch to turn on the power when using the LBP 100 next time. In the fourth embodiment, the external device 2 is turned on.
By turning on N, the power of LBP100 is automatically turned on.
A configuration that enables returning to the state will be described.

The processing procedure at this time will be described with reference to the block diagram of FIG. The power supply unit 8 is configured to be able to separately cut off the power supply to the control unit 1 and the power supply to the printing mechanism unit 9. The power supply unit 8 controls the power supply O from the power supply control unit 16.
When receiving the FF command, only the power supply to the printing mechanism unit 8 is cut off, and the power supply to the control unit 1 is continued. In this state, the power supply control unit 16 continues to turn on the power supply of the external device 2.
The / OFF state is constantly monitored. When the power of the external device 2 is turned on, the power supply unit 8 is turned on.
Output the command. Upon receiving the power-on command, the power supply unit 8 restarts power supply to the printing mechanism unit 9.

As described above, when the power of the external device 2 is turned on, the LBP 100 automatically returns to the printable state. In this case, electric power is always supplied to the control unit 1, but the electric power consumption of the control unit 1 is insignificant as compared with the printing mechanism unit 8. Therefore, it is very effective from the viewpoint of energy saving to cut off the power supply to the printing mechanism section 8 which is the maximum power consumption part in the LBP 100 while the external device 2 is powered off.

Further, the power source of the LBP100 is automatically turned off.
As the condition for F, it is determined that the power-off state of the external device 2 has continued for a predetermined time. However, the predetermined time may be set by the user. In this case, if the user sets the predetermined time longer (about 30 minutes),
It can be used to prevent forgetting to turn off the power of the LBP 100. Also, by setting the predetermined time to be short, it becomes possible to interlock the power supply of the external device 2 with the power supply of the LBP 100.

As described above, according to the third and fourth embodiments, when the external device 2 is turned off and there is no possibility that print data will be sent for a predetermined time. In addition, the power of LBP100 is automatically turned off.
As a result, the useless power consumption is reduced.

In the third and fourth embodiments described above, the power supply control unit 6 outputs a power OFF command to the power supply unit 8 only when the power OFF state of the external device continues for a predetermined time. However, the condition is not limited to this, and other conditions may be combined. For example,
When the two conditions that the power of the external device 2 remains off for a predetermined time and that the LBP 100 is not operated within the predetermined time are satisfied, the power control unit 16 issues a power off command. You may make it output. This is step S33 in the flowchart of FIG.
"In the external device power is ON, or LB
Is there any access to P100? ] Is used as the judgment condition.

Furthermore, in the above-mentioned third and fourth embodiments, the method of determining the power state (ON / OFF) of the external device 2 uses the signal line of the interface cable, but is not limited to this. .

It is obvious that the power supply control method of the present invention is applicable not only to the printing apparatus but also to any peripheral equipment connected to the host computer.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

<Schematic Description of Apparatus Main Body> FIG. 10 is a schematic view of an ink jet recording apparatus to which the present invention can be applied.
In the figure, the carriage HC that engages with the spiral groove 5004 of the lead screw 5005 that rotates via the driving force transmission gears 5011 and 5009 in conjunction with the forward / reverse rotation of the drive motor 5013 has pins (not shown). Then, it is reciprocated in the directions of arrows a and b. An inkjet cartridge IJC is mounted on the carriage HC. A paper pressing plate 5002 presses the paper against the platen 5000 in the moving direction of the carriage. Fifty
Reference numerals 07 and 5008 denote photocouplers for confirming the existence of the carriage lever 5006 in this area, and checking the motor 5013.
It is a home position detecting means for switching the rotation direction of the. Reference numeral 5016 denotes a member that supports a cap member 5022 that caps the front surface of the recording head.
Is a suction means for sucking the inside of the cap, and performs suction recovery of the recording head through the opening 5023 in the cap. Fifty
Reference numeral 17 is a cleaning blade, and 5019 is a member that allows this blade to move in the front-rear direction, and these are supported by a main body support plate 5018. Needless to say, a well-known cleaning blade can be applied to this example instead of this form. Reference numeral 5012 denotes a lever for starting suction for suction recovery, which moves in accordance with the movement of the cam 5020 that engages with the carriage, and the movement of the driving force from the driving motor is controlled by a known transmission means such as clutch switching. To be done.

The capping, cleaning, and suction recovery are configured so that desired processing can be performed at their corresponding positions by the action of the lead screw 5005 when the carriage comes to the area on the home position side. As long as the desired operation is performed at the timing, any of the above can be applied to this example.

<Description of Control Configuration> Next, a control configuration for executing the recording control of the above-mentioned apparatus will be described with reference to the block diagram shown in FIG. In the figure showing the control circuit, 1700 is an interface for inputting a recording signal, 1701 is an MPU, 1702 is an MPU 1701.
RO storing the control program executed by
M and 1703 are dynamic type ROMs for storing various data (recording data, recording data supplied to the head, etc.). Reference numeral 1704 is a gate array that controls the supply of print data to the print head 1708, and includes an interface 1700, an MPU 1701, and a RAM 17.
It also controls the data transfer between 03. Reference numeral 1710 is a carrier motor for carrying the recording head 1708, and 1709 is a carrying motor for carrying the recording paper. Reference numeral 1705 is a head driver for driving the head, and 1706 and 1707 are motor drivers for driving the carry motor 1709 and the carrier motor 1710, respectively.

The operation of the above control structure will be described. When a recording signal is input to the interface 1700, the gate array 1
A recording signal is converted between the 704 and the MPU 1701 to print data for printing. And the motor driver 1
The recording heads 706 and 1707 are driven, and the recording head is driven according to the recording data sent to the head driver 1705 to perform printing.

It is obvious that the constituent elements of the present invention can be incorporated in the control structure of the ink jet printer as described above, and the present invention can be applied not only to the laser beam printer but also to the above ink jet printer and the like.

Although the laser beam printer has been described as an example of the image forming apparatus of the present embodiment, the present invention is not limited to this, and it is applicable to an ink jet printer described below.

[0057]

As described above, according to the present invention, it is possible to cut off the power supply to a device when the power supply to the device is meaningless for a predetermined time. Therefore, it is possible to prevent wasteful power consumption.

[0058]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the internal structure of a laser beam printer of this embodiment.

FIG. 2 is a block diagram showing a schematic configuration of a control system of the laser beam printer shown in FIG.

FIG. 3 is a block diagram illustrating a functional configuration of a control unit 1 according to the first embodiment.

FIG. 4 is a diagram illustrating a data structure of error information generated by an error processing unit.

FIG. 5 is a flowchart showing a processing procedure of an error processing unit.

FIG. 6 is a flowchart showing an operation procedure of the power supply control unit 7.

FIG. 7 is a flowchart showing an algorithm when the power of the LBP is turned on.

FIG. 8 is a block diagram illustrating a functional configuration of a control unit according to the third exemplary embodiment.

FIG. 9 is a flowchart illustrating an algorithm of power supply control processing of a power supply control unit 16 according to the third embodiment.

FIG. 10 is a schematic view of an inkjet recording apparatus to which the present invention can be applied.

11 is a block diagram showing a control configuration for executing recording control of the inkjet recording apparatus of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 control unit 2 external device 3 input unit 4 print data analysis unit 5 output unit 6 error processing unit 7 power supply control unit 8 power supply unit 9 printing mechanism unit 10 recording medium 11 storage device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H02J 1/00 308 K 7509-5G

Claims (14)

[Claims] 1. A power supply control method for an apparatus used by being connected to an external apparatus, comprising: a detection step of detecting that the apparatus is in an abnormal state; and the abnormal state detected in the detection step continues for a predetermined time. A power supply control method, comprising: a judgment process for judging whether or not the power supply is cut off, and a cutting-off process for cutting off power supply to the device when it is judged that the abnormal state has continued for a predetermined time in the judgment process. . 2. The determining step determines whether or not the power supply should be cut off based on whether or not any operation is performed on the apparatus within a predetermined time after the abnormal state is detected in the detecting step. 2. The power supply control method according to claim 1, wherein the power cutoff step cuts off power supply to the device when it is determined in the determination step that power supply should be cut off. 3. A power supply control method for an apparatus used by being connected to an external apparatus, comprising: a detection step of detecting that an abnormality has occurred in the apparatus; and a step of detecting an abnormality in the detection step. A generation step of generating abnormality information based on abnormality, a determination step of determining whether or not a release operation is performed within a predetermined time after the occurrence of the abnormality is detected in the detection step, and a predetermined time within the determination step. If it is determined that the release operation has not been performed, the abnormality information generated in the generation step is stored in the storage medium and the power supply to the device is shut off, and the abnormality information is stored in the storage medium when the power is turned on. And a startup step of switching startup processing based on the generated abnormality information. 4. A printing device having a recording unit for inputting print data from an external device and recording the print data on a recording medium based on the print data, wherein the detecting device detects that the device is in an abnormal state. And a judging means for judging whether or not the abnormal state detected by the detecting means has continued for a predetermined time, and if the judging means judges that the abnormal state has continued for a predetermined time, the power supply to the apparatus is turned on. A printing apparatus, comprising: a blocking unit for blocking. 5. The judgment means judges whether or not the power supply should be cut off based on whether any operation has been performed on the apparatus within a predetermined time after the detection of the abnormal state by the detection means. The printing apparatus according to claim 4, wherein the cutoff unit cuts off power supply to the apparatus when the judgment unit judges that the power supply should be cut off. 6. A printing apparatus having a recording unit for inputting print data from an external apparatus and recording on a recording medium based on the print data, the detection being for detecting an abnormality in the printing apparatus. Means for generating an abnormality information based on the abnormality when the occurrence of the abnormality is detected by the detecting means, and a releasing operation is performed within a predetermined time after the occurrence of the abnormality is detected by the detecting means. And a judgment means for judging whether or not the cancel operation is performed within a predetermined time by the judgment means, the abnormality information generated by the generation means is stored in a storage medium, and the power supply is cut off. A printing device, comprising: a shut-off unit and a startup unit that changes a startup process procedure based on abnormality information stored in the storage medium when the power is turned on. 7. The disconnecting means, when the determining means determines that the release operation has not been performed within a predetermined time,
The abnormality information generated by the generation unit and the print data that has already been received are stored in a storage medium, and the power supply is cut off, and the startup unit is based on the abnormality information stored in the storage medium when the power is turned on. 7. The printing apparatus according to claim 6, wherein the start-up processing procedure is changed to read the print data stored in the storage medium in a printable manner as necessary. 8. A power supply control method for an apparatus used by being connected to an external apparatus, comprising: a detecting step of detecting that the external apparatus connected to the apparatus is in a power-off state; A determination step of determining whether or not the power-off state of the external device has been continuously detected for a predetermined time; and, if it is determined in the determination step that the power-off state of the external device has continued for a predetermined time, the device And a shutoff step of shutting off the power supply of the power source. 9. The determining step includes whether or not the power-off state of the external device is continuously detected for a predetermined time in the detecting step, and some operation is performed on the device during the predetermined time. Based on whether or not the power supply to the device should be shut off, the shutoff step, if the power supply to the device is determined to be shut off in the determination step, the device 9. The power supply control method according to claim 8, wherein the power supply to the power supply is cut off. 10. A printing apparatus having a recording unit for inputting print data from an external apparatus and recording on a recording medium based on the print data, wherein the external apparatus connected to the printing apparatus is powered off. A detection means for detecting that the external device is in a state, a determination means for determining whether or not the power-off state of the external device is continuously detected for a predetermined time by the detection device, and a power supply for the external device by the determination device. A printing apparatus, comprising: a shutoff unit that shuts off power supply to the printing apparatus when it is determined that the off state has continued for a predetermined time. 11. The determining means determines whether or not the power-off state of the external device is continuously detected for a predetermined time by the detecting means, and some operation is performed on the device during the predetermined time. Based on whether or not the power supply to the device should be cut off, and the cutoff unit determines that the power supply to the device should be cut off by the judgment unit. 11. The printing apparatus according to claim 10, wherein the power supply to the printer is cut off. 12. A printing apparatus having a recording unit for inputting print data from an external apparatus and recording on a recording medium based on the print data, wherein an external apparatus connected to the printing apparatus is turned on. ON / OFF state detection means, determination means for determining whether or not the external device power-off state is detected for a predetermined time by the detection means, and the external power source for the external device by the determination means. When it is determined that the off state has continued for a predetermined time, a shutoff means for shutting off the supply of electric power to the recording unit, and the detection unit, when detecting the power-on state of the external device, to the recording unit. A printing apparatus comprising: a supply unit that restarts supply of electric power. 13. The printing apparatus according to claim 4, wherein the recording section performs recording on a recording medium by a laser beam method. 14. The printing apparatus according to claim 4, wherein the recording section performs recording on a recording medium by an ink jet method.