JP2002149380A - Log data recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a log data recorder capable of recording log data with less data quantity and also promptly coping with the occurrence of a problem. SOLUTION: A log recording part 58 monitors communication information communicated between a controller 14 and the controlling part 54 of a printer main body 16 and control information including conveyance information from a conveying mechanisms 56, generates log data by acquiring time when the control information is generated from a timer 60 and always records the log data onto a recording memory 62 in a predetermined order. A log pattern discriminating part 64 decides whether or not the log data recorded all the time in the memory 62 coincides with a preliminarily set log storage condition stored in a log pattern storing part 68 and saves the log data in the a save recording memory 66 when the log data coincides with the log storage condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a log data recording apparatus, and more particularly to a log data recording apparatus for recording log data such as control information and print information in an image forming apparatus such as a copying machine or a printer.

[0002]

2. Description of the Related Art In recent years, the speed of image forming apparatuses such as printers has been remarkably increased. However, such high-speed image forming apparatuses are often used for notification of certificates and bills for general customers. There are many. For example, there is a case where an address is printed on a table and a billing amount or the like is printed on the back side to form a bill.

In such a case, when printing bills of a plurality of different customers continuously at a high speed, the address and the amount of money do not match due to duplication of paper, or printing information such as the name of the address and the amount of billing. In the event that a customer is missing, it can be a major problem with customer credit issues.

In order to solve such a problem, in order to analyze the cause when the problem occurs, communication information including a control command transmitted from a controller for controlling the printer to the printer, paper transport information, and image information Generally, control information such as formation information is recorded as log data, or error information when an error occurs is recorded (for example, JP-A-11-109806, JP-A-5-109806). -107720 gazette).

[0005]

However, the above control information has a huge amount of information, and it may be discovered that a problem has occurred since the bill was sent to the user, so that the control information may be over a long period of time. This requires a large-capacity memory and is costly.

If the problem is caused by software for controlling the image forming apparatus, the problem can be solved by analyzing recorded log data to identify the cause, redesigning the software again, and debugging. However, there is a problem that it takes time because a procedure such as evaluation is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a log data recording apparatus capable of recording log data with a smaller amount of data and capable of promptly coping with the occurrence of a problem. The purpose is to provide.

[0008]

According to a first aspect of the present invention, there is provided a log data recording apparatus for recording log data of a plurality of pieces of control information relating to image forming control in an image forming apparatus. A memory for storing log data, time information obtaining means for obtaining time information of the time at which the control information occurred, and time information of the time at which the control information occurred, based on the plurality of pieces of control information. Log data recording means for recording the data in the memory according to a predetermined order or position.

According to the present invention, there is provided a memory for storing log data of a plurality of pieces of control information relating to image formation control in the image forming apparatus. The control information includes, for example, communication information such as a control command communicated between a controller for controlling the image forming apparatus and the image forming apparatus, and a sensor provided on a recording paper conveyance path in the image forming apparatus. There is conveyance information such as a detection signal. The memory may be configured to store only the latest predetermined amount of log data, such as a ring buffer.

The time information obtaining means is for obtaining time information of the time when the control information is generated. The time information can include, for example, information such as year, month, day, hour, minute, and second. .

The log data recording means monitors control information relating to image formation control, and records time information of a time when the control information is generated in a memory in a predetermined order or position based on a plurality of pieces of control information. That is, for example, when a plurality of pieces of control information are generated in image formation control for one sheet of recording paper, the order of recording the time information at which the control information is generated or the position of the memory for recording is determined in advance, and according to this order or position. The time information of the time when the control information is generated is recorded in the memory.

As described above, since only the time information need be recorded without recording the control information itself, the data amount of the log data can be reduced. When an image is formed on a plurality of recording sheets, log data in which the number of the recording sheet and the time information of the time when the plurality of pieces of control information are generated can be used. Thus, for example, control information for each recording sheet can be easily grasped, and even if a problem occurs in the image forming apparatus, the cause can be quickly investigated.

The log data recording means determines time information corresponding to one predetermined control information among a plurality of control information as reference time information, and determines the time information of the determined reference time information and other control information. May be obtained, and the obtained difference time information may be recorded in the memory according to a predetermined order or position. Thereby, the data amount of the log data can be further reduced.

Further, a save memory for saving the log data recorded in the memory, a setting means for setting a save condition of the log data, and reading the log data from the memory, the read log data is saved. And a save unit that saves the log data to the save memory when the condition is satisfied.

That is, if all the control information relating to the image forming control is recorded, the capacity of the memory may be insufficient. For example, the memory stores only the latest predetermined amount of log data such as a ring buffer. The configuration is as follows. If the log data save condition set by the setting unit matches the log data read from the memory, the log data is saved in the save memory.

As the evacuation condition, for example, a log pattern at the time of a predetermined abnormal operation can be arbitrarily set. Thereby, the log data at the time of the abnormal operation is saved in the save memory, so that the cause of the malfunction can be easily analyzed. Further, the save unit may stop the image forming control when the log data read from the memory matches the save condition. Further, whether or not to stop may be set by the setting means. Further, not only the image forming control may be stopped, but also this may be notified.

[0017]

Embodiments of the present invention will be described below. FIG. 1 shows the appearance of the image forming apparatus according to the present embodiment.

As shown in FIG. 1, the image forming apparatus 10
A printer 12 and a controller 14 for controlling the printer 12 are provided.

The printer 12 includes a printer main body 16, a feeder 18, and a post-processing machine 20.

The feeder 18 is provided with paper feed trays 22A and 22A.
B, 22C, and feeds paper of a designated size to the printer body 16.

The printer main body 16 is connected to the controller 14 by a communication cable 23, and forms an image based on print information transmitted from the controller 14.

The printer body 16 includes, for example, an image forming unit 24 as shown in FIG. The image forming unit 24 includes a charging device 26, a photosensitive drum 28, an exposure device 30, a developing device 32, a static elimination device 34, and an intermediate transfer member 3.
6, primary transfer device 38, secondary transfer device 40, peeling device 4
2. It includes a fixing device 44 and the like.

The exposure apparatus 30 includes a light source such as a semiconductor laser (not shown), a polygon mirror for deflecting a light beam emitted from the light source toward the photosensitive drum 28, an fθ lens, and the like. .

In the image forming section 24 configured as described above, first, the photosensitive drum 28 that rotates at a constant speed in the direction of arrow A in FIG. Then, the exposure device 30 scans the charged photosensitive drum 28 with a light beam modulated according to the print information transmitted from the controller 14. As a result, an electrostatic latent image corresponding to the print information is formed on the photosensitive drum 28.

Next, the developing device 32 develops the electrostatic latent image formed on the photosensitive drum 28 with toner, and
8, a toner image is formed. The formed toner image is transferred to the intermediate transfer member 36 by the primary transfer device 38, and the toner image transferred to the intermediate transfer member 36 is recorded on the recording paper 46 conveyed by the secondary transfer device 40 in the direction of arrow B in FIG. Transcribed. Thus, an image corresponding to the print information is formed on the recording paper 46.

After the image is transferred to the recording paper 46, the recording paper 46 is peeled off from the intermediate transfer body 36 by a peeling device 42, and is subjected to a fixing process by a fixing device 44. Thereby, the recording paper 4
The toner image formed on 6 is fixed. The recording paper 46 on which the toner image has been fixed is conveyed to the post-processing device 20.

The post-processing device 20 includes a discharge tray 48 and a purge tray 50. The recording paper 46 on which an image is normally formed is discharged to the discharge tray 48, and unnecessary paper is discharged to the purge tray 50.

The operation panel 5 is provided on the printer body 16.
2 are provided. The operation panel 52 includes a display unit and operation keys. An operation menu is displayed on the display unit, and the printer 12 operates according to the operation by operating an operation key according to the displayed operation menu.

FIG. 3 is a schematic block diagram of the printer main body 16. As shown in FIG.
Are a control unit 54, an operation panel 52, a memory 53, an image forming unit 24, a transport mechanism 56, a log recording unit 58, a timer 6
0, a constant recording memory 62, a log pattern determining unit 64, a save recording memory 66, a log pattern storage unit 68, a print discharge control unit 70, and the like.

The log recording unit 58 constantly monitors control information including communication information such as control commands and sheet numbers communicated between the controller 14 and the control unit 54 and transport information from the transport mechanism 56. Control information and timer 60
The log data is generated based on the time information from, and is always stored in the recording memory 62 sequentially.

There are a plurality of types of control commands, for example, a Hint command and a Print command for one recording sheet.
A command and a Request command are communicated between the controller 14 and the control unit 54. These control commands are, for example, a Hint command, a Print command, a Requ command during a normal operation.
It occurs in the order of the est command.

The transport mechanism 56 includes a plurality of sensors, for example, a feed sensor, an Skw sensor, an S8 sensor, and a DG.
The sensor is configured to include six types of sensors, an E sensor and a Deliver sensor. When each sensor detects a recording sheet, it notifies the control unit 54 of this as conveyance information (detection signal). That is, the control unit 54 is notified of six types of transport information for one recording sheet. It should be noted that these transport information are, for example, a Feed sensor and a Skw during normal operation.
It occurs in the order of sensor, S8 sensor, DGE sensor, and Deliver sensor.

The control section 54 controls the image forming section 24 and the transport mechanism 56 based on the control information including the communication information such as the control command and the transport information to print an image on the recording paper 46.

In the control information, in addition to the control command and the transport information, for example, a detection signal from an opening / closing sensor for detecting opening / closing of the paper feed trays 22A to 22C is included in the control information as specific I / F information. Is also good.

Further, the time when the control information such as the control command and the transport information is generated is recorded as log data for each recording sheet, so that when a problem occurs, the log data is referred to to locate the problem. Can be easily grasped.

The constant recording memory 62 is a so-called ring buffer, and the log recording unit 58 records the log data in the constant recording memory 62 at the address next to the address where the latest log data is recorded. Then, when it reaches the last address, it returns to the first address and records log data similarly. Thus, the latest log data is always recorded and the oldest log data is deleted.

As a recording format of the log data, for example, the time information (Time Stamp) is 6 bytes (day, day,
The information of hour, minute, and second is 1 byte each, and the information of 1/1000 second is 2 bytes), and the control command (Command) is 1 byte.
The byte and sheet (recording paper) number may be 2 bytes, for a total of 9 bytes. In this case, 9 bytes per recording paper × 9 (3 types of control commands + 6 types of transport information =
(9 types in total) = 81 bytes are required, and the log data becomes enormous.

Therefore, in the present embodiment, 1
The log data per recording sheet is in a simple recording format. That is, as shown in FIG. 5, the information of the log data is composed of a sheet number (Sheet No), time information of the time when three types of control commands and six types of transport information are generated (received). That is, the sheet number,
The storage locations are determined in advance in the order of the time information of three types of control commands and the time information of six types of transport information, and table data is prepared. The storage locations of the control command and the transport information are determined, for example, in a predetermined order of occurrence.

As a result, as compared with the case of FIG. 4, the information of the control command can be deleted. Therefore, the log data per sheet of recording paper has a sheet number of 2 bytes, time information of 6 bytes × 9 ( 3 types of control commands + transport information 6
(Type = 9 types in total) = 56 bytes of 54 bytes in total is sufficient.

As described above, by using log data as table data, the amount of log data can be significantly reduced, and the memory capacity can be reduced.

As shown in FIG. 6, the time when the Hint command is generated may be set as a reference time, and the difference between the control command and the transport information after the Hint command may be recorded. .

That is, as shown in FIG. 6, the time information of the Hint command is 6 bytes as described above,
The time information of the nt command is a difference time (unit: 1/1000 second) from the time information of the Hint command, and
The time information of the est command is a difference time from the time information of the Print command. Similarly, the time difference from the immediately preceding control command or the time information of the transport information is recorded as time information.

As a result, the time information of the control command other than the Hint command and the time information of
Log data per recording sheet is sufficient because only about bytes are required. The log data per sheet is 2 bytes for sheet number, 6 bytes for time information + 2 bytes for time information × 8 (2 types of control commands + 6 types of transport information = 8 types in total) ) = 16 bytes, a total of 24 bytes is sufficient, and the amount of log data can be further reduced. The time information may further include year and month information.

Next, the flow of the log data will be described with reference to a conceptual diagram shown in FIG. 7. The log pattern discriminating section 64 always reads the log data recorded in the recording memory 62, and the read log data is stored in the log data. It is determined whether or not a preset log store condition stored in the pattern storage unit is satisfied. If the read log data satisfies the preset log store condition stored in the log pattern storage unit, the log data is saved to the save recording memory 66 and a command is issued as to whether or not to stop discharging the recording paper 46. A print discharge control command signal for performing print discharge control.
Outputs 0. The evacuation recording memory 66 may be divided into a plurality of evacuation recording memories 66A, 66B, and 66C, an empty evacuation recording memory may be searched, and the evacuation recording memory may be sequentially saved in the searched evacuation recording memory.

The log store condition can be set on a log store / stop condition setting screen 72 displayed on the operation panel 52 as shown in FIG. As shown in FIG.
On the log store / stop condition setting screen 72, a plurality of log store conditions 1 and 2 can be set. The log store condition data (log pattern data) set on the log store / stop condition setting screen 72 is stored in the log pattern storage unit 68 by the control unit 54.

As described above, since a plurality of log store conditions can be set, as shown in FIG. 9, for example, when the transport time of the recording paper from the S8 sensor to the DGE sensor is longer than a predetermined specified time, α is set. The log store condition 1 can be set, and the case where the sheet feed tray 22C is opened / closed can be set as the log store condition 2 as β setting. And
The log pattern determination unit 64 determines whether the log data read from the continuous recording memory 62 matches one of the α setting and β setting conditions, and if so, stores the log data in the evacuation recording memory 66. Evacuate. Thereby, S
Since the log data at the time of abnormality, such as when the transport time of the recording sheet from the eight sensors to the DGE sensor is longer than a predetermined time, is saved, the cause of the abnormality can be easily analyzed.

When a plurality of evacuation recording memories 66 are provided as shown in FIG. 7, they may be recorded in separate evacuation recording memories for α setting and β setting. When only one setting is valid and the other setting is not set, the evacuation recording memory with no setting may be used. Further, if the same log data is already recorded in the save recording memory, the log data may not be saved.

As shown in FIG. 8, the log store / stop condition setting screen 72 includes a log store condition 1 setting field 7
3, a log store condition 2 setting field 74, a start button 75, and a cancel button 76 are provided. The log store condition 1 setting field 73 and the log store condition 2 setting field 74 are provided with input boxes 80 to 94.

The log store condition 1 and the log store condition 2 become effective by checking the check boxes 77 and 78, respectively. Therefore, both the log store conditions 1 and 2 can be set, or either one can be set. Further, three or more log store conditions may be set.

The input boxes 80 and 82 are used to set the condition A. The input box 80 is used to input a predetermined numerical value corresponding to control information such as a control command and transport information. The input box 82 is for inputting more detailed conditions, but is omitted here for simplicity of description. The correspondence between the control information such as the control command and the transport information and the predetermined numerical value corresponding thereto is stored in the memory 53 in advance, for example.

The input boxes 88 and 90 are for setting the condition B in the same manner as the input boxes 80 and 82. The input box 88 is a predetermined command corresponding to control information such as control commands and transport information. A numerical value is entered. The input box 90 is for inputting more detailed conditions, but is omitted here for simplicity of explanation.

The input box 84 is for selecting a logical operator of the condition A and the condition B, and can set or (logical sum), and (logical product), and the like.
That is, conditions such as (A or B) and (A and B) can be set, and conditions such as (A and! B) can also be set.

The input box 86 is for inputting a condition timer value E, for example, a numerical value with 10 msec as one unit (for example, 65530 msec at maximum).
c can be set). This is effective, for example, when "and" is selected in the input box 84.

The input box 92 is for inputting a store delay timer value G, for example, 10 msec.
A numerical value with c as one unit is input.

The input box 94 is for selecting whether or not to stop the operation of the printer main body 16 after saving the log data, and can select “no stop” or “stop”.

When these conditions are set, a start button 75
Is pressed, the log pattern determination unit 64 starts determining the log store conditions. On the other hand, when the cancel button 76 is pressed, the set conditions are cleared.

Here, when the log store condition 1 of (A and B) is set, the control information corresponding to the numerical value input to the input box 80 is detected, that is, the control information is always recorded in the recording memory 62. From E × 10ms
If the control information corresponding to the numerical value input to the input box 88 during ec is detected, the log store condition 1 is satisfied.

When the log store condition 1 of (A or B) is set, the control information corresponding to the numerical value input to the input box 80 or the control information corresponding to the numerical value input to the input box 88 is determined. When this is detected, the log store condition 1 is satisfied.

Further, when the log store condition 1 of (A and! B) is set, EX is detected after the control information corresponding to the numerical value input to the input box 80 is detected.
If the control information corresponding to the numerical value input to the input box 88 is not detected within 10 msec, the log store condition 1 is satisfied.

More specifically, for example, a numerical value corresponding to the control command Hint is input to the input box 80, "and" is selected in the input box 84, and "5" is input in the input box 86. When a numerical value corresponding to the control command Print is input to the input box 88, "50" is input to the input box 92, and "no stop" is selected in the input box 94, the control command Hint is detected five times. × 10msec = 50m
The log store condition 1 is satisfied when the control command Print is detected during the sec. As a result, the log pattern determination unit 64 always saves the log data recorded in the recording memory 62 to the evacuation recording memory 66 after a lapse of 50 × 10 msec = 500 msec. Since “No stop” is selected as the operation after saving the log data,
The printer body 16 continues to operate normally, and the recording paper is discharged to the discharge tray 48.

Next, the log pattern determining section 6 shown in FIG.
4 will be described with reference to the state diagram in FIG.

The log pattern judging section 64 checks the state S1 (L
(OG_NOT_READY), the system enters a log store condition setting wait state. In this state, when the log store condition is set on the log store / stop condition setting screen 72 shown in FIG. 8 and the start button 75 is pressed, the state transits to the state S2.

State S2 (LOG_TRIGGER_WA)
IT), the condition A in the set log store condition
Alternatively, it is determined whether or not information corresponding to condition B is received. Here, when the log store condition is (A or B) and information corresponding to the condition A or the condition B is received, the state transits to the state S4.

When the log store condition is (A and
When the information corresponding to the condition A or the condition B is received in the case B), or when the information corresponding to the condition A is received when the log store condition is (A and! B), the state transits to the state S3. I do.

State S3 (LOG_TRIGGER_B_
In (WAIT), it is determined whether or not information corresponding to the condition B or the condition A is received within the time of the condition timer value E. Here, if the log store condition is (A and B) and a timeout occurs, that is, if the information corresponding to the condition A or the condition B is not received within the E time, or if the log store condition is (A and! B) If the information corresponding to the condition B is received in the case of (2), the process returns to the state S2.

On the other hand, if the log store condition is (A and
In the case of B), if information corresponding to the condition B or the condition A is received within the E time, or if the log store condition is (A and
! If a timeout occurs in the case of B), that is, if the information corresponding to the condition B is not received within the E time, the state transits to the state S4.

State S4 (LOG_TIMER_G_WA)
In IT), after the store delay timer value G has elapsed, the printer discharge control unit 70 is instructed to stop printing, and the state transits to the state S5. In the state S5 (LOG_STACKING), the log data is saved from the recording memory 62 to the save recording memory 66, and the state transits to the state S2.

Next, the operation of the present embodiment will be described. FIG. 11 shows a data flow diagram according to the present embodiment, and FIG. 12 shows a data flow diagram in the log pattern determination unit 64. Note that the recording of log data relating to the image forming process is omitted, and transport information from a plurality of paper feed sensors included in the transport mechanism 56 and control commands communicated between the controller 14 and the control unit 54 of the printer main body 16 are described. Only the recording of log data related to the above will be described.

As shown in FIG. 11, in the log recording unit 58, the process 60 periodically accesses the timer 60, and stores time information (for example, information of day, hour, minute, second, and 1/1000 second). It is stored in an internal memory (not shown) as D1.

In the log recording unit 58, the process 10
In step 2, a detection signal (transport information) from the paper feed sensor 96 included in the transport mechanism 56 is monitored, and
Monitor communication information such as a control command communicated between the controller 14 and the control unit 54 of the printer main body 16,
Extract communication information that needs to be recorded as log data.

Then, a sheet table is created in which the sheet number of the recording paper (sheet) is added to the communication information and the transport information extracted in the process 106, and this is stored in the internal memory (not shown) as the sheet table information D2.

In the process 108, the time information of the received transport information is added to the sheet table information D 2 and the data is transferred to the process 112 as log data. Similarly, in the process 110, the time information of the extracted communication information is added to the sheet table information D2 to generate log data, and the process 11
Transfer to 2.

In the process 112, the log data relating to the transport information and the log data relating to the communication information are combined and stored in the recording memory 62 as log data D3, and the log completion information indicating the completion of the log data recording is determined by the log pattern discrimination. Notify the section 64.

As a result, in the log pattern determining unit 64, in the process 120, the log store condition D 4 set in advance and stored in the log pattern storage unit 68 matches the log data D 3 stored in the constant recording memory 62. It is determined whether or not to do. And if they match,
The log data D3 is saved in the save recording memory 66, and when the print stop is instructed by the log store condition D4, the print eject control unit 70 is instructed to stop the print.

Next, the details of the process 120 will be described with reference to the data flow diagram shown in FIG.

In the process 121, the log store condition D4
And whether or not the log data D3 stored in the constant recording memory 62 matches the log data D3.
Notify 123. In process 122, if the store delay timer is set in the log store condition,
After the set G time has passed, the process 124 is notified.
In the process 124, the log data D <b> 3 recorded in the recording memory 62 is evacuated to the evacuation recording memory 66.

In the process 123, when the print stop is instructed by the log store condition D4, the print instructing unit 70 is instructed to stop the print.

As described above, since the log store conditions can be set arbitrarily, log data under various conditions can be saved, and the cause of abnormal operation can be easily analyzed, for example.

[0079]

According to the present invention, log data can be recorded with a smaller amount of data, and the location of the problem can be grasped at an early stage when a problem occurs.

[Brief description of the drawings]

FIG. 1 is an external view of an image forming apparatus.

FIG. 2 is a schematic configuration diagram of an image forming unit.

FIG. 3 is a block diagram of a printer main body.

FIG. 4 is a diagram showing a recording format of log data.

FIG. 5 is a diagram showing a recording format of log data.

FIG. 6 is a diagram showing a recording format of log data.

FIG. 7 is a diagram for explaining the concept of the flow of log data.

FIG. 8 is a view showing a log store condition setting screen.

FIG. 9 is a diagram for explaining the concept of determining log store conditions.

FIG. 10 is a state diagram showing a state of a log pattern determination unit.

FIG. 11 is a data flow diagram illustrating a flow of control and data in the printer main body.

FIG. 12 is a data flow diagram illustrating a flow of control and data in a log pattern determination unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Image forming apparatus 12 Printer 14 Controller 16 Printer main body 18 Feeder 20 Post-processing machine 22A, 22B, 22C Paper feed tray 23 Communication cable 24 Image forming part 48 Discharge tray 50 Purge tray 52 Operation panel (setting means) 53 Memory 54 Control part 56 Transport mechanism 58 Log recording unit 60 Timer (time information acquisition unit) 62 Continuous recording memory (memory) 64 Log pattern determination unit (evacuation unit) 66 Evacuation recording memory (evacuation memory) 68 Log pattern storage unit 70 Print ejection control unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) 5B083 F term (Reference) 2C061 AP04 AQ06 AR03 HK19 HX10 2C087 AA09 AC08 BA14 BD53 CB02 CB12 DA10 2C187 AC07 AF01 DC01 HA17 2H027 DA50 DE07 EE08 EH10 EJ08 EJ13 EJ15 ZA07 5B021 AA01 NN19 5B083 AA08 BB01 CC10 EE06 EE07

Claims (4)

[Claims] 1. A log data recording device that records log data of a plurality of pieces of control information related to image formation control in an image forming apparatus, a memory for storing the log data, and time information of a time when the control information is generated. Time information acquiring means for acquiring the time, and log data recording means for recording the time information of the time when the control information occurs in the memory in a predetermined order or position based on the plurality of control information, A log data recording device, comprising: 2. The log data recording means determines time information corresponding to one predetermined control information among the plurality of control information as reference time information, and determines the determined reference time information and other control information. 2. The log data recording device according to claim 1, wherein difference time information from the time information is obtained, and the obtained difference time information is recorded in the memory in accordance with the predetermined order or position. 3. A save memory for saving log data recorded in the memory, setting means for setting a save condition for the log data, and reading the log data from the memory, 3. An evacuation means for evacuation of the log data to the evacuation memory when the log data matches the evacuation condition, further comprising:
The log data recording device according to the above. 4. The image forming apparatus according to claim 1, wherein the saving unit stops the image forming control when the log data read from the memory matches the saving condition. 2. The log data recording device according to claim 1.