JP4120155B2 - Log data recording apparatus and log data recording method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a log data recording apparatus, and more particularly to a log data recording apparatus that records log data such as control information and print information in an image forming apparatus such as a copying machine or a printer.
[0002]
[Prior art]
In recent years, image forming apparatuses such as printers have been remarkably increased in speed, but such high-speed image forming apparatuses are often used for notification work such as certificates and bills for general customers. For example, the address is printed on the front and the billing amount is printed on the back surface to make a bill.
[0003]
In such a case, when multiple invoices of different customers are continuously printed at high speed, the address and the amount of money do not match due to overlapping sheets, or the printing information such as the address and the amount of the charge is missing. If this happens, it can be a major problem related to customer credit issues.
[0004]
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 the controller that controls the printer to the printer, paper conveyance information, image formation information, etc. In general, the control information is recorded as log data, or error information when an error occurs is recorded (for example, JP-A-11-109806 and JP-A-5-107720). See the official gazette).
[0005]
[Problems to be solved by the invention]
[0006]
  QIf the cause of the problem is in the software used to control the image forming device, the procedure to solve the problem is to analyze the recorded log data, identify the cause, redesign the software, debug, and evaluate There is a problem that it takes time because it is necessary.
[0007]
  The present invention has been made to solve the above problems.,Log data recording device that can quickly cope with problemsAnd log data recording methodThe purpose is to provide.
[0008]
[Means for Solving the Problems]
  In order to achieve the above object, the invention described in claim 1 is a log data recording apparatus that records log data of a plurality of control information related to image formation control in an image forming apparatus that forms an image for each recording sheet.For each recording sheetStop the memory for storing the log data and the image formation controlUsing log patternStop condition setting means for setting a stop condition, stop condition determining means for reading the log data recorded in the memory, and determining whether the read log data satisfies the stop condition, and the stop condition determination Stopping means for stopping the image forming control when the read log data is determined by the means to satisfy the stop condition;Whether or not to stop the image forming control by the stopping unit when the stopping condition determining unit determines that the stop condition is satisfied.For each stop conditionInSelectable selection means.
[0009]
  According to the present invention, log data of a plurality of control information related to image formation control in the image forming apparatus is stored.For each recording sheetRecordRecordIt has a memory to do. The control information includes, for example, communication information such as a control command communicated between the controller for controlling the image forming apparatus and the image forming apparatus, and a sensor provided in a recording paper conveyance path in the image forming apparatus. There is transport information such as a detection signal. The memory stores only the latest predetermined amount of log data, such as a ring buffer.RecordIt can be set as such.
[0010]
  The stop condition setting unit stops the image forming control.Using log patternThis is for setting a stop condition.
[0011]
  Stop condition judgment meansThe log data recorded in the memory is read, and it is determined whether or not the read log data satisfies the stop condition.
[0012]
  The stop unit stops the image forming control when it is determined that the log data read by the stop condition determining unit satisfies the stop condition. In addition to stopping the image formation control, this may be notified. The selection means isWhether or not to stop the image formation control by the stop means when the stop condition determination means determines that the stop condition is satisfied.For each stop conditionInIt is selectable.
[0013]
  Also,The stop condition setting unit may include a stop condition setting screen having an input box for selecting whether the image forming control is stopped or not stopped by the stop unit, and the selection unit may be the input box.
[0014]
  A save memory for saving log data recorded in the memory,Log data is read from the memory, and the read log data isStop conditionAnd a saving unit that saves the log data to the saving memory when the two data coincide with each other.
[0015]
  That is, if all the control information related to image formation control is recorded, the capacity of the memory may become insufficient. For example, the memory is configured to store only the latest predetermined amount of log data such as a ring buffer. To do. And set by the stop condition setting meansUsing log patternStop conditionLog dataAnd memoryFromIf the read log data matches, the log data is saved in the save memory.
[0016]
  As the stop condition, for example, a predetermined log pattern at the time of abnormal operation can be arbitrarily set. As a result, the log data at the time of abnormal operation is saved in the save memory, so that the cause of the abnormality can be easily analyzed. The saving unit may not save the log data when the same log data is already recorded in the saving memory. The stop condition setting means may be configured such that the conveyance time of the recording paper from the first sensor that detects the recording paper to the second sensor is longer than a predetermined time.Stop conditions using the log pattern ofIt may be configurable. The stop condition setting unit opens and closes a tray for feeding recording paper into the image forming apparatus.Stop conditions using the log pattern ofIt may be configurable. Further, the stop condition setting means may be capable of setting a plurality of conditions and setting either a logical sum or a logical product of the first condition and the second condition. The control information may include any one of a control command for controlling the image forming apparatus, recording sheet conveyance information, and image formation information. Further, in a log data recording method for recording log data of a plurality of control information related to image formation control in an image forming apparatus that forms an image for each recording sheet,For each recording sheetRecord the log dataRecordThe log data recorded in the memory for reading is read, and the read log data is read by the stop condition determining step for determining whether the read log data satisfies a preset stop condition, and the stop condition determining step. A stop step of stopping the image forming control when it is determined that a preset stop condition is satisfied;Using log patternA stop condition setting step for setting the stop condition;Whether the image forming control is to be stopped or not to be stopped by the stop step when it is determined by the stop condition determining step that the stop condition is satisfied.For each stop conditionInA log data recording method characterized by comprising a selection step of selecting.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. FIG. 1 shows the appearance of the image forming apparatus according to the present embodiment.
[0018]
As shown in FIG. 1, the image forming apparatus 10 includes a printer 12 and a controller 14 that controls the printer 12.
[0019]
The printer 12 includes a printer main body 16, a feeder 18, and a post-processing device 20.
[0020]
The feeder 18 includes paper feed trays 22 </ b> A, 22 </ b> B, and 22 </ b> C, and feeds paper of a specified size to the printer main body 16.
[0021]
The printer main body 16 is connected to the controller 14 via a communication cable 23 and forms an image based on print information transmitted from the controller 14.
[0022]
For example, the printer main body 16 includes 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 charge eliminating device 34, an intermediate transfer member 36, a primary transfer device 38, a secondary transfer device 40, a peeling device 42, and a fixing device. 44 etc. are comprised.
[0023]
The exposure apparatus 30 includes, for example, 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.
[0024]
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 the drawing is uniformly charged by the charging device 26. 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.
[0025]
Next, the electrostatic latent image formed on the photosensitive drum 28 is developed with toner by the developing device 32 to form a toner image on the photosensitive drum 28. 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 transferred to the recording paper 46 conveyed in the direction of arrow B in the figure by the secondary transfer device 40. Transcribed. As a result, an image corresponding to the print information is formed on the recording paper 46.
[0026]
After the image is transferred, the recording paper 46 is peeled off from the intermediate transfer member 36 by the peeling device 42 and subjected to fixing processing by the fixing device 44. As a result, the toner image formed on the recording paper 46 is fixed. The recording paper 46 on which the toner image is fixed is conveyed to the post-processor 20.
[0027]
The post-processing machine 20 includes a discharge tray 48 and a purge tray 50, and the recording paper 46 on which normal image formation has been performed is discharged to the discharge tray 48, and unnecessary paper is discharged to the purge tray 50.
[0028]
The printer body 16 is provided with an operation panel 52. 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 the operation key according to the displayed operation menu.
[0029]
FIG. 3 shows a schematic block diagram of the printer main body 16. As shown in FIG. 3, the printer main body 16 includes 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 60, a constant recording memory 62, and a log pattern determination unit 64. , A save recording memory 66, a log pattern storage unit 68, a print discharge control unit 70, and the like.
[0030]
The log recording unit 58 constantly monitors communication information such as control commands and sheet numbers communicated between the controller 14 and the control unit 54, and control information including conveyance information from the conveyance mechanism 56. Log data is generated based on the time information from the timer 60 and sequentially stored in the continuous recording memory 62.
[0031]
There are a plurality of types of control commands. For example, three types of control commands, a Hint command, a Print command, and a Request command, are communicated between the controller 14 and the control unit 54 for one recording sheet. These control commands are generated in the order of, for example, a Hint command, a Print command, and a Request command during normal operation.
[0032]
The transport mechanism 56 includes a plurality of sensors, for example, a feed sensor, a Skw sensor, an S8 sensor, a DGE sensor, and a Deliver sensor. When each sensor detects a recording sheet, The controller 54 is notified as conveyance information (detection signal). That is, six types of conveyance information are notified to the control unit 54 for one recording sheet. Note that these pieces of conveyance information are generated in the order of, for example, a Feed sensor, a Skw sensor, an S8 sensor, a DGE sensor, and a Deliver sensor during normal operation.
[0033]
The control unit 54 prints an image on the recording paper 46 by controlling the image forming unit 24 and the conveyance mechanism 56 based on the control information including the communication information such as the control command and the conveyance information.
[0034]
In addition to the control command and the conveyance information, for example, a detection signal from an opening / closing sensor that detects opening / closing of the sheet feeding trays 22A to 22C may be included in the control information as specific I / F information.
[0035]
In addition, by recording the time when control information such as control commands and transport information occurs as log data for each recording sheet, it is easy to locate the problem by referring to the log data when any problem occurs. I can grasp it.
[0036]
The constant recording memory 62 is a so-called ring buffer, and the log recording unit 58 records log data at an address next to the address where the latest log data of the constant recording memory 62 is recorded. When the last address is reached, the log data is recorded in the same manner after returning to the first address. As a result, the latest log data is always recorded and the oldest log data is erased.
[0037]
As the log data recording format, for example, the time information (Time Stamp) is 6 bytes (one day, hour, minute and second information is 1 each for one log data as in the conventional format shown in FIG. 1 byte for 1/1000 second information), 1 byte for the control command (Command), and 2 bytes for the sheet (recording paper) number. In this case, 9 bytes per recording paper may be used. Bytes × 9 (3 types of control commands + 6 types of conveyance information = 9 types in total) = 81 bytes are required, and the log data becomes enormous.
[0038]
Therefore, in the present embodiment, the log data per recording sheet is set as a recording format as follows. That is, as shown in FIG. 5, the log data information is composed of a sheet number (Sheet No) and time information of the time when three types of control commands and six types of conveyance information are generated (received). That is, the storage location is determined in advance in the order of the sheet number, the time information of the three types of control commands, and the time information of the six types of conveyance information. For example, the storage location of the control command and the conveyance information is determined in the order of occurrence.
[0039]
As a result, the control command information can be deleted as compared with the case of FIG. 4, so the log data per recording sheet has a sheet number of 2 bytes, time information of 6 bytes × 9 (control command 3 A total of 56 bytes (type + conveyance information 6 types = total 9 types) = 54 bytes is sufficient.
[0040]
Thus, by using log data as table data, the amount of log data can be greatly reduced, and the memory capacity can be reduced.
[0041]
As shown in FIG. 6, the time at which the Hint command is generated may be used as the reference time, and the control command and the conveyance information after the Hint command may be recorded with a difference time from this reference time.
[0042]
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 Print command is the time difference (1/1000 second unit) from the time information of the Hint command, and the Request command Is the difference time from the time information of the Print command. Similarly, the time difference from the previous control command or the time information of the conveyance information is recorded as time information.
[0043]
As a result, it is sufficient that the time information of the control command other than the Hint command and the time information of the conveyance information are, for example, about 2 bytes. Therefore, the log data per recording sheet has a sheet number of 2 bytes and time information of 6 bytes. + Time information 2 bytes × 8 (2 types of control command + 6 types of transport information = 8 types in total) = 16 bytes in total, which is sufficient, and the amount of log data can be further reduced. The time information may further include year and month information.
[0044]
Next, the flow of the log data will be described with reference to the conceptual diagram shown in FIG. 7. The log pattern determination unit 64 reads the log data recorded in the constant recording memory 62, and the read log data is stored in the log pattern storage unit. It is determined whether or not a preset log store condition stored in is satisfied. If the read log data satisfies the preset log store condition stored in the log pattern storage unit, the command is to save to the save recording memory 66 and to stop the discharge of the recording paper 46. A print discharge control command signal is output from the print discharge control unit 70. The save record memory 66 may be divided into a plurality of save record memories 66A, 66B, and 66C, empty save record memories may be searched, and the saved save record memories may be sequentially saved.
[0045]
The log store conditions 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. 8, the log store / stop condition setting screen 72 can set a plurality of log store conditions 1 and 2. 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.
[0046]
Since a plurality of log store conditions can be set in this way, 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 time, the log store condition is set as α. The log store condition 2 can be set as β setting when 1 is set and the paper feed tray 22C is opened and closed. Then, the log pattern discriminating unit 64 determines whether or not the log data read from the constant recording memory 62 matches either of the α setting or β setting conditions. Save the data. As a result, the log data at the time of abnormality such as when the conveyance time of the recording paper from the S8 sensor to the DGE sensor is longer than a predetermined time is saved, so that the cause of the abnormality can be easily analyzed.
[0047]
In the case where a plurality of save recording memories 66 are provided as shown in FIG. 7, recording may be performed in separate save recording memories for α setting and β setting. If only one setting is valid and the other setting is not set, the saving recording memory without setting may be used. Further, when the same log data is already recorded in the save recording memory, the log data may not be saved.
[0048]
As shown in FIG. 8, the log store / stop condition setting screen 72 includes a log store condition 1 setting field 73, a log store condition 2 setting field 74, a start button 75, and a cancel button 76. Input boxes 80 to 94 are provided in the log store condition 1 setting field 73 and the log store condition 2 setting field 74.
[0049]
Note that log store condition 1 and log store condition 2 are validated by checking check boxes 77 and 78, respectively. Therefore, both log store conditions 1 and 2 can be set, or either one can be set. Also, three or more log store conditions may be set.
[0050]
The input boxes 80 and 82 are for setting the condition A. In the input box 80, for example, predetermined numerical values corresponding to control information such as control commands and conveyance information are input. The input box 82 is for inputting more detailed conditions, but is omitted here for the sake of simplicity. The correspondence relationship between control information such as control commands and conveyance information and predetermined numerical values corresponding to the control information is stored in advance in the memory 53, for example.
[0051]
The input boxes 88 and 90 are for setting the condition B in the same manner as the input boxes 80 and 82. For the input box 88, for example, predetermined numerical values corresponding to control information such as control commands and conveyance information are input. Is done. The input box 90 is for inputting more detailed conditions, but is omitted here for the sake of simplicity.
[0052]
The input box 84 is used to select a logical operator of the condition A and the condition B, and or (logical sum), and (logical product), etc. can be set. 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.
[0053]
The input box 86 is used to input the condition timer value E. For example, a numerical value with 10 msec as one unit is input (for example, a maximum of 65530 msec can be set). This is effective, for example, when “and” is selected in the input box 84.
[0054]
The input box 92 is for inputting a store delay timer value G, and a numerical value with 10 msec as one unit is input, for example.
[0055]
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 “non-stop” or “stop”.
[0056]
When these conditions are set and the start button 75 is pressed, determination of the log store condition by the log pattern determination unit 64 is started. On the other hand, when the cancel button 76 is pressed, the set condition is cleared.
[0057]
Here, when the log store condition 1 of (A and B) is set, the control information corresponding to the numerical value input in the input box 80 is detected, that is, after being always recorded in the recording memory 62, E × The log store condition 1 is satisfied when control information corresponding to the numerical value input in the input box 88 is detected for 10 msec.
[0058]
When the log store condition 1 (A or B) is set, either control information corresponding to the numerical value input in the input box 80 or control information corresponding to the numerical value input in the input box 88 is detected. Log store condition 1 is satisfied.
[0059]
Furthermore, when the log store condition 1 of (A and! B) is set, the control information corresponding to the numerical value input in the input box 80 is detected and input in the input box 88 during E × 10 msec. Log store condition 1 is satisfied when control information corresponding to the numerical value is not detected.
[0060]
To explain with a specific example, for example, a numerical value corresponding to the control command Hint is input to the input box 80, “and” is selected to the input box 84, “5” is input to the input box 86, and the input box When a numerical value corresponding to the control command Print is input to 88, “50” is input to the input box 92, and “non-stop” is selected in the input box 94, 5 × 10 msec = after the control command Hint is detected Log store condition 1 is satisfied when the control command Print is detected within 50 msec. Thereby, the log pattern determination unit 64 saves the log data recorded in the constant recording memory 62 to the save recording memory 66 after 50 × 10 msec = 500 msec has elapsed. Since “non-stop” is selected as the operation after saving the log data, the printer main body 16 continues to operate normally, and the recording paper is discharged to the discharge tray 48.
[0061]
Next, state transition of the log pattern determination unit 64 will be described with reference to a state diagram in the log pattern determination unit 64 shown in FIG.
[0062]
The log pattern discriminating unit 64 enters a log store condition setting waiting state in the state S1 (LOG_NOT_READY). 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 transitions to the state S2.
[0063]
In the state S2 (LOG_TRIGGER_WAIT), it is determined whether or not information corresponding to the condition A or the condition B in the set log store condition 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 transitions to the state S4.
[0064]
When the log store condition is (A and B) and information corresponding to the condition A or B is received, or when the log store condition is (A and! B), information corresponding to the condition A is received. If so, the flow goes to the state S3.
[0065]
In the state S3 (LOG_TRIGGER_B_WAIT), it is determined whether information corresponding to the condition B or the condition A is received within the condition timer value E time. Here, when the log store condition is (A and B) and time-out occurs, that is, when information corresponding to the condition A or condition B is not received within the E time, or the log store condition is (A and! B). ), If the information corresponding to the condition B is received, the process returns to the state S2.
[0066]
On the other hand, when the log store condition is (A and B) and information corresponding to the condition B or condition A is received within E time, or when the log store condition is (A and! B) and time-out occurs, That is, when the information corresponding to the condition B is not received within the E time, the flow goes to the state S4.
[0067]
In the state S4 (LOG_TIMER_G_WAIT), after the store delay timer value G elapses, the printer discharge control unit 70 is instructed to stop printing, and the state transitions 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 transitions to the state S2.
[0068]
Next, the operation of this 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 recording of log data relating to the image forming process is omitted, and conveyance information from a plurality of paper feed sensors included in the conveyance mechanism 56 and a control command communicated between the controller 14 and the control unit 54 of the printer main body 16. Only log data recording will be described.
[0069]
As shown in FIG. 11, in the log recording unit 58, the process 60 periodically accesses the timer 60, and time information (for example, date, hour, minute, second, 1/1000 second information) is illustrated as time information D1. Do not store in internal memory.
[0070]
The log recording unit 58 monitors a detection signal (conveyance information) from the paper feed sensor 96 included in the conveyance mechanism 56 in the process 102, and between the controller 14 and the control unit 54 of the printer main body 16 in the process 104. The communication information such as the control command communicated in the monitoring is monitored, and the communication information that needs to be recorded as log data is extracted.
[0071]
Then, a sheet table is created by adding the sheet number of the recording paper (sheet) to the communication information and conveyance information extracted in the process 106, and this is stored in an internal memory (not shown) as sheet table information D2.
[0072]
In the process 108, the time information of the received conveyance information is added to the sheet table information D2 and 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 and transferred to the process 112 as log data.
[0073]
In the process 112, the log data related to the conveyance information and the log data related to the communication information are combined and stored in the recording memory 62 as log data D3, and log completion information indicating completion of log data recording is sent to the log pattern determination unit 64. Notice.
[0074]
As a result, the log pattern discriminating unit 64 determines whether or not the log store condition D4 set in advance and stored in the log pattern storage unit 68 matches the log data D3 stored in the constant recording memory 62 in the process 120. Determine whether. If they match, the log data D3 is saved in the save recording memory 66, and if the print stop is instructed by the log store condition D4, the print discharge control unit 70 is instructed to stop printing. .
[0075]
Details of the process 120 will now be described with reference to the data flow diagram shown in FIG.
[0076]
In the process 121, it is determined whether or not the log store condition D4 matches the log data D3 stored in the constant recording memory 62, and the determination result is notified to the processes 122 and 123. In the process 122, when the store delay timer is set in the log store condition, the process 124 is notified after the set G time elapses. In the process 124, the log data D3 recorded in the constant recording memory 62 is saved in the save recording memory 66.
[0077]
Further, in the process 123, when the print stop is instructed by the log store condition D4, the print discharge control unit 70 is instructed to stop the print.
[0078]
As described above, since the log store condition can be arbitrarily set, log data of various conditions can be saved, and for example, the cause of the abnormal operation can be easily analyzed.
[0079]
【The invention's effect】
  According to the present invention,It has the effect that the location of the problem can be grasped at an early stage when the 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 illustrating 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 diagram showing a log store condition setting screen.
FIG. 9 is a diagram for explaining a concept of determining a log store condition.
FIG. 10 is a state diagram showing a state of a log pattern discrimination unit.
FIG. 11 is a data flow diagram showing control and data flow in the printer main body.
FIG. 12 is a data flow diagram showing a flow of control and data in a log pattern discrimination unit.
[Explanation of symbols]
10 Image forming apparatus
12 Printer
14 Controller
16 Printer body
18 Feeder
20 Post-processing machine
22A, 22B, 22C Paper tray
23 Communication cable
24 Image forming unit
48 discharge tray
50 Purge tray
52 Operation panel (setting means)
53 memory
54 Control unit
56 Transport mechanism
58 Log recording part
60 timer (time information acquisition means)
62 Continuous recording memory (memory)
64 Log pattern discriminating unit (evacuation means)
66 Evacuation Recording Memory (Evacuation Memory)
68 Log pattern storage
70 Print Discharge Control Unit

Claims (9)

In a log data recording apparatus that records log data of a plurality of control information related to image formation control in an image forming apparatus that forms an image for each recording sheet,
A memory for recording the log data for each recording sheet ;
Stop condition setting means for setting a stop condition using a log pattern for stopping the image formation control;
Stop condition determining means for reading log data recorded in the memory and determining whether the read log data satisfies the stop condition;
Stop means for stopping the image forming control when the read log data is determined by the stop condition determining means to satisfy the stop condition;
, Or a stop of the image forming control by the stop means, and selectable selection means whether or not to perform stop for each of the stop condition when it is determined that the stop condition is satisfied by the stop condition determination means,
A log data recording apparatus comprising: The stop condition setting means includes a stop condition setting screen having an input box for selecting stop of the image formation control by the stop means or no stop,
The log data recording apparatus according to claim 1, wherein the selection unit is the input box. A save memory for saving log data recorded in the memory;
Saving means for reading the log data from the memory and saving the log data to the saving memory when the read log data matches the stop condition;
The log data recording device according to claim 1, further comprising: 4. The log data recording apparatus according to claim 3 , wherein the save unit does not save the log data when the same log data is already recorded in the save memory. The stop condition setting means can set a stop condition using a log pattern when the conveyance time of the recording sheet from the first sensor for detecting the recording sheet to the second sensor is longer than a predetermined time. The log data recording device according to claim 1, wherein the log data recording device is a log data recording device. 6. The stop condition setting unit can set a stop condition using a log pattern when a tray for feeding recording paper into an image forming apparatus is opened and closed. The log data recording device according to any one of the above.   2. The stop condition setting unit can set a plurality of conditions and can set either a logical sum or a logical product of a first condition and a second condition. The log data recording device according to any one of claims 6 to 6.   8. The control information according to claim 1, wherein the control information includes any one of a control command for controlling the image forming apparatus, recording sheet conveyance information, and image formation information. Log data recording device. In a log data recording method for recording log data of a plurality of control information related to image formation control in an image forming apparatus that forms an image for each recording sheet,
Reading the log data recorded the log data for each recording sheet in a memory for recorded, and stop condition determining step read log data to determine whether a preset stop condition is satisfied,
A stop step of stopping the image forming control when it is determined by the stop condition determining step that the read log data satisfies a preset stop condition;
A stop condition setting step for setting the stop condition using a log pattern ;
A selection step for selecting, for each stop condition, whether to stop the image forming control by the stop step when it is determined by the stop condition determining step that the stop condition is satisfied ;
A log data recording method comprising:

Images