JP2009090470A - Image forming apparatus, image forming system, image forming program and printer driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus which can set a power-saving shift time conformed to a service mode at a low cost and can appropriately hold the shift time. <P>SOLUTION: The image forming apparatus is equipped with an image forming means (printing mechanism part 104) which carries out image formation on the basis of received printing information, a shifting means (power-saving shift time control part 102 etc.) which shifts the apparatus itself to a preliminarily set power-saving mode when a predetermined transition period passes, a calculating means (power-saving shift time control part 102 etc.) which calculates an occurrence frequency of processing related to the image formation, and a changing means (power-saving shift time control part 102 etc.) which changes the predetermined transition period according to the occurrence frequency calculated by the calculating means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image forming apparatus, an image forming system, an image forming program, and a printer driver.

  In recent years, there has been a strong demand for energy saving of electrical equipment from the viewpoint of global environmental conservation, and improvement of power saving performance of various electrical equipment has become an urgent task.

  As a result, image forming apparatuses such as printers and copiers as a kind of electrical equipment do not print frequently, that is, print within a predetermined time (for example, 5 to 30 minutes) from the previous printing process. When processing is not performed, there are many cases where a transition is made from a so-called standby state in which printing can be started in a short time to a power saving state (power saving state) with reduced power consumption.

  On the other hand, with regard to the power saving transition time (transition time) as the time to shift from the standby state to the power saving state, the power saving transition time is increased to some extent (that is, the standby state continues for a certain length of time) There is also a desire to reduce the time required to return from the power saving state to the standby state at the start of print job processing, and to improve the convenience for the user and the like.

  Various techniques have been proposed to meet such demands.

  For example, Japanese Patent Application Laid-Open No. 2003-255778 discloses a technique of lengthening the power saving transition time when the frequency of print jobs sent to the printing apparatus is high and shortening the power saving transition time when the frequency is low. Yes.

  The control system of the printer PR5 to which this technique is applied has a configuration as shown in FIG. 20, for example.

  That is, the printer PR5 includes an external interface unit 800 that exchanges data such as print commands with an external device, a print data editing unit 801 that edits print data, and a power saving transition time control that changes a power saving transition time. 802, a hardware timer unit 803 serving as a time measuring unit, a printing mechanism unit 804 including a printer engine that executes printing processing, a print history data storage unit 805 that stores print history data, and the like. The

  Here, the hardware timer is built in a microcomputer or the like and generates an accurate time (depending on the accuracy of the clock), when it is desired to perform other processing on the software with a delay, or the timer timer This means that the frequency can be counted by setting the input to the outside.

  However, this technique requires complicated processing such as collection, analysis, and storage of usage history data, and requires high information processing capabilities such as the need for a hardware timer as described above, which increases costs. There was a problem.

  In addition, a non-volatile memory or the like constituting the print history data storage unit 805 is required, which increases the number of parts, complicates the structure, and increases the part cost.

  Japanese Patent Laid-Open No. 2001-347728 discloses a technique for obtaining an average job interval from the number of jobs in a certain period and then obtaining a power saving transition time.

  However, with this technology, when shifting from a state where the print job frequency is high to a state where the printing frequency is low such as a lunch break or a general meeting, the power saving transition time after the last printing under a high frequency state is too long Therefore, there was a problem that the efficiency was low from the viewpoint of energy saving.

In addition, with the optimal power saving transition time adjusted to the print job frequency at the point of interest, the printer shifts to a situation where printing processing is extremely reduced, such as lunch breaks and general meetings, and the job frequency changes greatly temporarily. In the case of the failure, there is a problem that the power saving transition time, which is originally optimal, is unnecessarily increased or decreased due to the temporary change.
JP 2003-255778 A JP 2001-347728 A

  The present invention provides an image forming apparatus, an image forming system, an image forming program, and a printer driver that can achieve a power saving transition time according to a usage mode at a low cost and can appropriately maintain the transition time. For the purpose.

  In order to solve the above problems, an image forming apparatus according to a first aspect of the present invention includes an image forming unit that forms an image based on received print information, and a saving that is set in advance when a predetermined transition period has elapsed. A transition unit that shifts the apparatus itself to a power mode; a calculation unit that calculates an occurrence frequency of processing related to image formation by the image forming unit; and the predetermined transition period is changed according to the occurrence frequency calculated by the calculation unit And changing means.

  The image forming apparatus according to a second aspect of the present invention further includes a determination unit that determines an increase / decrease tendency of the occurrence frequency, and the change unit is configured to perform the predetermined processing when the determination unit determines that the increase tendency is increased. The predetermined transition period is increased when the transition period is decreased and the determination means determines that the transition period is decreasing.

  According to a third aspect of the present invention, there is provided an image forming apparatus comprising: a minimum period setting unit that sets a minimum value of the predetermined transition period; and the changing unit is less than the minimum value set by the minimum period setting unit. It is characterized by not reducing the transition period.

  According to a fourth aspect of the present invention, there is provided an image forming apparatus comprising a maximum period setting unit that sets a maximum value of the predetermined transition period, and the changing unit does not exceed a maximum value set by the maximum period setting unit. The transition period is not increased.

  According to a fifth aspect of the present invention, there is provided an image forming apparatus for recording an update of a determination result by the determination unit over a predetermined time period, and an occurrence frequency in the predetermined time period based on the update record of the recording unit. An analysis means for analyzing the increase / decrease tendency is further provided.

  The image forming apparatus according to a sixth aspect of the invention is characterized in that the changing unit increases or decreases the predetermined transition period based on an analysis result of the analyzing unit in the predetermined time zone.

  The image forming apparatus according to a seventh aspect of the invention is characterized in that the changing unit further includes an increase / decrease rate setting unit for setting an increase / decrease rate for the predetermined transition period.

  The image forming apparatus according to an eighth aspect of the invention is characterized in that the increase / decrease rate setting means sets the increase / decrease rate according to the occurrence frequency calculated by the calculation means.

  The image forming apparatus according to claim 9 is characterized in that the increase / decrease rate setting means sets the increase / decrease rate in accordance with an increasing / decreasing tendency of the occurrence frequency by the determining means.

  According to a tenth aspect of the present invention, in the image forming apparatus, the transition time changed by the changing means is A1, a time from a process related to a predetermined image formation to a process related to the previous image formation is T1, and a predetermined image formation is performed. When the time from the process related to the previous process to the process related to image formation is T2, if the condition of A1> T1 or A1> T2 is satisfied, a maintaining means for maintaining the transition time A1 is provided. And

  According to an eleventh aspect of the present invention, in the image forming apparatus, the transition time changed by the changing unit is A1, the period in which the processing relating to the image formation has not occurred is A2, and the processing immediately before the processing relating to the predetermined image formation is performed. When T1 is the time to the process relating to image formation and T2 is the time from the process relating to the predetermined image formation to the process relating to the previous image formation, the conditions of A1 + A2 ≧ T1 + T2 and A1> T1 or A1> T2 are satisfied. In such a case, a maintenance means for maintaining the transition time A1 is provided.

  An image forming system according to a twelfth aspect of the present invention includes one or more image forming apparatuses according to any one of the first to eleventh aspects, and one or more connected to the image forming apparatus via a communication unit. It is characterized by comprising two or more information processing devices.

  An image forming program according to a thirteenth aspect of the present invention shifts the apparatus itself to a power saving mode set in advance when an image forming process for forming an image based on received print information and a predetermined transition period elapses. Calculating means for calculating a transition process, a calculation process for calculating an occurrence frequency of processing relating to image formation in the image forming process, and a changing process for changing the predetermined transition period according to the occurrence frequency calculated in the calculation process It is made to perform.

  A printer driver according to a fourteenth aspect of the present invention calculates a transition process for shifting an image forming apparatus to a preset power saving mode and a frequency of occurrence of processing relating to image formation when a predetermined transition period elapses. And a change process for changing the predetermined transition period according to the occurrence frequency calculated in the calculation process.

  According to a fifteenth aspect of the present invention, the printer driver further includes determination means for determining an increase / decrease tendency of the occurrence frequency, and when the change process is determined to be increasing by the determination process, the predetermined process is performed. The predetermined transition period is increased when it is determined that the transition period is decreased and the determination process indicates that the transition period is decreasing.

  According to the present invention, the following effects can be obtained.

  That is, according to the first aspect of the present invention, the transition period to the power saving mode is changed according to the occurrence frequency of the processing related to image formation as compared with the case where the present configuration is not provided. It is possible to set the power saving transition time (transition period) according to the usage mode, and there is an excellent effect that both energy saving and convenience can be achieved.

  According to the second aspect of the present invention, since the transition period is changed in accordance with the increasing / decreasing tendency of the occurrence frequency of the processing relating to the image formation as compared with the case where the present configuration is not provided, the usage mode is further increased. It can be set as the power saving transition time according to

  According to the third aspect of the present invention, the transition period is not reduced below the minimum value set by the minimum period setting means, compared with the case where the present configuration is not provided, so that power saving is achieved. It is possible to avoid a situation where the transition to the mode becomes too early.

  According to the fourth aspect of the present invention, the transition period is not increased beyond the maximum value set by the maximum period setting means as compared with the case where the present configuration is not provided. It is possible to avoid a situation where the power mode is not shifted to forever.

  According to the fifth aspect of the present invention, compared with the case where the present configuration is not provided, the increase / decrease tendency of the occurrence frequency in the predetermined time zone is analyzed based on the update record for the predetermined time zone. Therefore, it can be set as the power saving transition time according to the usage mode for each time zone.

  According to invention of Claim 6, it can be set as the power saving transition time according to the usage condition for every time slot | zone compared with the case where it does not have this structure.

  According to the seventh aspect of the present invention, since the rate of increase / decrease of the transition period is set as compared with the case where the present configuration is not provided, the change amount of the transition time is changed at a predetermined timing. It is possible to set the power saving transition time according to the usage mode.

  According to the eighth aspect of the present invention, the rate of increase / decrease is set according to the frequency of occurrence calculated by the calculation means, compared with the case where the present configuration is not provided, so that power saving can be achieved in accordance with the usage mode. It can be a transition time.

  According to the ninth aspect of the present invention, the rate of increase / decrease is set in accordance with the tendency of increase / decrease in the frequency of occurrence by the determination means, compared with the case where the present configuration is not provided. It can be a transition time.

  According to the invention described in claim 10, since the transition time is maintained when the predetermined condition is satisfied as compared with the case where the present configuration is not provided, the optimum transition time is appropriately set. It has an excellent effect that both energy saving and convenience can be achieved.

  According to the eleventh aspect of the present invention, the transition time is maintained when a predetermined condition is satisfied as compared with the case where the present configuration is not provided. It has an excellent effect that both energy saving and convenience can be achieved.

  According to the twelfth aspect of the present invention, compared to the case where the present configuration is not provided, it is possible to achieve a power saving transition time according to the usage mode, and it is possible to achieve both energy saving and convenience. There is an effect.

  According to the thirteenth aspect of the present invention, as compared with the case where the present configuration is not provided, the transition period to the power saving mode is changed according to the frequency of occurrence of processing relating to image formation. The power saving transition time can be set in accordance with the above, and there is an excellent effect that both energy saving and convenience can be achieved.

  According to the fourteenth aspect of the present invention, since the transition period to the power saving mode is changed in accordance with the frequency of processing relating to image formation, compared to the case where the present configuration is not provided, the usage mode The power saving transition time can be set in accordance with the above, and there is an excellent effect that both energy saving and convenience can be achieved.

  According to the fifteenth aspect of the present invention, since the transition period is changed in accordance with the increasing / decreasing tendency of the occurrence frequency of the processing relating to the image formation as compared with the case where the present configuration is not provided, the usage mode is further increased. It can be set as the power saving transition time according to

  Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. Here, in the accompanying drawings, the same reference numerals are given to the same members, and duplicate descriptions are omitted. In addition, since description here is the best form by which this invention is implemented, this invention is not limited to the said form.

  (First embodiment)

  The image forming system S1 and the printer PR1 according to the first embodiment of the present invention will be described with reference to FIGS.

  As shown in the block diagram of FIG. 1, the image forming system S1 includes two printers PR1 and PR2 as image forming apparatuses according to the present invention and two units as information processing apparatuses via a network N such as a LAN. Personal computers PC1 and PC2 are connected.

  The printers PR1 and PR2 are not particularly limited, but may be a laser printer or a full color printer having a network function.

  In this embodiment, a case where two printers and two information processing apparatuses are connected is shown. However, the present invention is not limited to this, and the number of both can be arbitrarily increased or decreased.

  Next, the configuration of the printer PR1 will be described with reference to the block diagram of FIG. Although not particularly limited, the printer PR2 can have the same configuration.

  The printer PR1 includes an external interface unit 100 that exchanges data such as print commands with external devices (information processing devices PC1, PC2, etc.), a print data editing unit 101 that edits print data, and a change in power saving transition time. A power saving transition time control unit 102 that performs the above, a software timer unit 103 as a time measuring unit, a printing mechanism unit 104 that includes a printer engine that executes printing processing, a user that performs various settings, etc. It consists of an interface 105 and the like.

  Here, the timer is a function used when processing is desired to be executed after a certain time or when processing is desired to be executed periodically. The timer includes a hardware timer built in a microcomputer or the like, and a software timer provided by the OS as a service or generated by predetermined application software as necessary.

  The built-in timer (hardware timer) counts the time created from the signal using the crystal oscillator and generates an interrupt when the value reaches a pre-specified value (called time-up or time-out). It has a mechanism to change it.

  The software timer has a mechanism for managing the elapsed time requested by the user program, counting using the built-in timer, and notifying the corresponding user program when the time is up.

  The number of software timers that can be registered at the same time and the degree of use are more flexible than hardware timers, but there may be delays and errors depending on the system operating status and the count start timing. For this reason, in embedded systems, it is necessary to use different timers depending on the processing that requires real-time accuracy and the processing that does not.

  In the present embodiment, a software timer is used as the software timer unit 103 to reduce the cost. However, a hardware timer may be used when high accuracy is required as described above.

  Further, as can be seen from the configuration of the conventional printer PR5 shown in FIG. 20, the printer PR1 according to the present embodiment does not require the print history data storage unit 805, so that the storage unit is configured. It is not necessary to mount a non-volatile memory or the like, and the cost can be further reduced. Note that when storing data such as various setting values, usage frequency history, and various determination results, it may be desirable to install a nonvolatile memory or the like as the storage unit.

  Next, with reference to FIG. 3 to FIG. 11, the processing procedure and implementation status of the power saving transition time changing process executed by the printer PR1 having the above configuration will be described.

  In the present embodiment, regarding the power saving transition time changing process, “normal pattern” (FIGS. 3 and 4) and “energy saving priority pattern” (FIG. 5 and FIG. 6), “Convenience-oriented pattern” (FIGS. 7 and 8), and “Concentrated job pattern” (FIGS. 9 and 10) are prepared.

First, in the “normal pattern” of the power saving transition time changing process, as shown in Table 1, the initial value of the power saving transition time is “10 minutes”, the maximum value is “18 minutes”, and the minimum value is “2 minutes”. ing.

  Here, the maximum value defines a limit that does not increase beyond the maximum value even when the initial power saving transition time is increased by the transition time change process, and the minimum value is the initial value by the transition time change process. Even if the power saving transition time of the value is gradually reduced, it defines a limit that does not decrease below the minimum value.

  As a result, it is possible to avoid a situation in which the transition to the power saving mode does not occur indefinitely or a situation in which the transition to the power saving mode is too early.

  When this process is started, first, the printer PR1 is turned on in step S10 and the process proceeds to step S11. The time measurement by the software timer unit 103 is started, and the process proceeds to step S12.

  In step S12, it is determined whether or not a print job (processing related to image formation) has come. If “Yes”, the process proceeds to step S22, and it is determined whether or not the power saving transition time has reached the maximum value. The

  If the determination result is “Yes” (corresponding to the section of time t1 to t2 in FIG. 4), the process proceeds to step S20 without increasing the power saving transition time (+0 minutes), and the printing process is performed. The process proceeds to step S21.

  If the determination result is “No” (corresponding to the section of time t0 to t1 in FIG. 4 and the occurrence frequency of the print job is relatively high), the process proceeds to step S23 and the power saving transition time is “ After adding “2 minutes”, the process proceeds to step S20, print processing is executed, and the process proceeds to step S21.

  In step S21, it is determined whether or not the power is off. If “Yes”, the process ends as it is, and if “No”, the process returns to step S11 and the same process is continued.

  On the other hand, if the determination result is “No” in step S12, the process proceeds to step S13 to determine whether or not “1 minute” has elapsed. Here, “1 minute” corresponds to an interval for determining whether or not a print job has come.

  If the determination result is “No”, the process returns to step S12. If the determination result is “Yes”, the process proceeds to step S14.

  In step S14, it is determined whether or not the power saving transition time has reached the minimum value, and in the case of “No” (corresponding to the section of time t2 to t3 in FIG. 4 and when the print job occurrence frequency is relatively low). In step S15, “2 minutes” is subtracted from the power saving transition time, and then step S21 is performed.

  If “Yes” is determined in step S14, it is determined whether or not the power saving transition time has passed since the transition to step S16. If “No”, the process proceeds to step S21. In the case of "", the process proceeds to step S17 to execute the process for shifting to the power saving mode, and then proceeds to step S18.

  In step S18, for example, the printer waits (“No” state) while checking whether a print instruction command is received from the information processing devices PC1, PC2, etc. as external devices, and determines that a print instruction command has been received (“Yes”). In the case of "", the process proceeds to step S19, the return process is executed, and the processes after step S20 are executed.

  As a result, the power saving transition time is gradually increased from the initial value (in the example of FIG. 3) in a use situation in which the occurrence frequency of the print job (processing related to image formation) is relatively high like the times t0 to t1 in the time chart of FIG. Therefore, it is possible to effectively avoid the situation of immediately shifting to the power saving mode and to improve the convenience of the user of the printer PR1.

  Further, even if the use situation in which the frequency of occurrence of print jobs (processing related to image formation) is relatively high continues from time t1 to time t2, the power saving transition time is set to a preset maximum value (18 in this example). Minutes), it is possible to avoid a situation in which the time is not increased and the power saving mode is not shifted for a too long time.

  Further, in a usage situation where the frequency of occurrence of a print job (processing related to image formation) is relatively low, such as the times t2 to t3 in the time chart of FIG. 4, the power saving transition time is gradually decreased (2 minutes in the example of FIG. 3). Therefore, energy saving can be improved by shortening the time required to shift to the power saving mode.

  Further, even if the use situation in which the occurrence frequency of the print job (processing relating to image formation) is relatively low continues after time t3, the power saving transition time is set to a minimum value (in this example, 2 minutes). ), The situation of shifting to the power saving mode too early can be avoided without decreasing the time.

  Next, the “energy saving emphasis pattern” of the power saving transition time changing process will be described based on the flowchart of FIG. 5 and the time chart of FIG.

  In the power saving transition time changing process, as shown in Table 1 above, the initial value of the power saving transition time is “10 minutes”, the maximum value is “18 minutes”, and the minimum value is “2 minutes”.

  When this process is started, first, in step S30, the printer PR1 is turned on and the process proceeds to step S31. The time measurement by the software timer unit 103 is started, and the process proceeds to step S32.

  In step S32, it is determined whether or not a print job (processing related to image formation) has come. If “Yes”, the process proceeds to step S42 to determine whether or not the power saving transition time has reached the maximum value. The

  If the determination result is “Yes” (corresponding to the section of time t5 to t6 in FIG. 6), the process proceeds to step S40 without increasing the power saving transition time (+0 minutes), and the printing process is performed. The process proceeds to step S41.

  If the determination result is “No” (corresponding to the section from time t4 to t5 in FIG. 6 and the occurrence frequency of the print job is relatively high), the process proceeds to step S43, and “ After adding “2 minutes”, the process proceeds to step S40, print processing is executed, and the process proceeds to step S41.

  In step S41, it is determined whether or not the power is off. If “Yes”, the process ends as it is, and if “No”, the process returns to step S31 and the same process is continued.

  On the other hand, if the determination result is “No” in step S32, the process proceeds to step S33 to determine whether or not “1 minute” has elapsed. Here, “1 minute” corresponds to an interval for determining whether or not a print job has come.

  If the determination result is “No”, the process returns to step S 32, and if “Yes”, the process proceeds to step S 34.

  In step S34, it is determined whether or not the power saving transition time has reached the minimum value, and in the case of “No” (corresponding to the section of time t6 to t7 in FIG. 6 and when the print job occurrence frequency is relatively low). In step S35, “4 minutes” is subtracted from the power saving transition time before step S41.

  If “Yes” is determined in step S 34, it is determined whether or not the power saving transition time has passed since step S 36. If “No”, the process proceeds to step S 41. In the case of "", the process proceeds to step S37 to execute the process for shifting to the power saving mode, and then proceeds to step S38.

  In step S38, for example, the printer waits while checking whether a print instruction command is received from the information processing devices PC1, PC2, etc. as external devices (state of “No”), and determines that the print instruction command has been received (“Yes”). In the case of "", the process proceeds to step S39, the return process is executed, and the processes after step S40 are executed.

  In this way, according to the “energy saving emphasis pattern”, since a larger time “4 minutes” is subtracted than the “2 minutes” subtraction of the above “normal pattern”, power saving is faster than the “normal pattern”. It becomes possible to shift to the mode, and the energy saving property can be further improved.

  Next, the “usefulness-oriented pattern” of the power saving transition time changing process will be described based on the flowchart of FIG. 7 and the time chart of FIG.

  In the power saving transition time changing process, as shown in Table 1 above, the initial value of the power saving transition time is “10 minutes”, the maximum value is “18 minutes”, and the minimum value is “2 minutes”.

  When this process is started, first, the printer PR1 is turned on in step S50 and the process proceeds to step S51. The time measurement by the software timer unit 103 is started, and the process proceeds to step S52.

  In step S52, it is determined whether or not a print job (processing related to image formation) has arrived. If “Yes”, the process proceeds to step S62 to determine whether or not the power saving transition time has reached the maximum value. The

  If the determination result is “Yes” (corresponding to the section from time t9 to t10 in FIG. 8), the process proceeds to step S60 without increasing the power saving transition time (+0 minutes), and the printing process is performed. The process proceeds to step S61.

  On the other hand, if the determination result is “No” (in FIG. 8, it corresponds to the section from time t8 to t9 or t11 to t12 and the occurrence frequency of the print job is relatively high), the process proceeds to step S63 to save power. After “4 minutes” is added to the transition time, the process proceeds to step S60, the printing process is executed, and the process proceeds to step S61.

  In step S61, it is determined whether or not the power is off. If “Yes”, the process ends as it is, and if “No”, the process returns to step S51 and the same process is continued.

  On the other hand, if the determination result is “No” in step S52, the process proceeds to step S53 to determine whether or not “1 minute” has elapsed. Here, “1 minute” corresponds to an interval for determining whether or not a print job has come.

  If the determination result is “No”, the process returns to step S52. If the determination result is “Yes”, the process proceeds to step S54.

  In step S54, it is determined whether or not the power saving transition time has reached the minimum value, and in the case of “No” (corresponding to the section of time t10 to t11 in FIG. 8 and the occurrence frequency of the print job is relatively low). In step S35, “2 minutes” is subtracted from the power saving transition time, and then step S61 is performed.

  If “Yes” is determined in step S54, it is determined whether or not the power saving transition time has passed since the transition to step S56. If “No”, the process proceeds to step S61. In the case of "", the process proceeds to step S57 to execute the process for shifting to the power saving mode, and then proceeds to step S58.

  In step S58, for example, the printer waits (“No” state) while checking whether a print instruction command is received from the information processing devices PC1, PC2, etc. as external devices, and determines that a print instruction command has been received (“Yes”). In the case of "", the process proceeds to step S59, the return process is executed, and the processes after step S60 are executed.

  Thus, according to the “convenient emphasis pattern”, a larger time “4 minutes” is added compared to the “normal pattern” addition of the “normal pattern” described above, so that the “usual pattern” is more than the “normal pattern”. It becomes possible to make it difficult to shift to the power saving mode, and the convenience of the user of the printer PR1 can be further improved.

  Next, the “concentrated job pattern” of the power saving transition time changing process will be described based on the flowchart of FIG. 9 and the time chart of FIG.

  In the power saving transition time changing process, as shown in Table 1 above, the initial value of the power saving transition time is “10 minutes”, the maximum value is “18 minutes”, and the minimum value is “2 minutes”.

  When this process is started, first, in step S70, the printer PR1 is turned on and the process proceeds to step S71, the time measurement by the software timer unit 103 is started, and the process proceeds to step S72.

  In step S72, it is determined whether or not a print job (processing related to image formation) has arrived. If “Yes”, the process proceeds to step S82 to determine whether or not the power saving transition time has reached the maximum value. The

  If the determination result is “Yes” (corresponding to the section of time t14 to t15 in FIG. 10), the process proceeds to step S80 without increasing the power saving transition time (+0 minutes), and the printing process is performed. The process proceeds to step S81.

  If the determination result is “No” (corresponding to the section after time t13 to t14 or t16 in FIG. 10 and the occurrence frequency of the print job is relatively high), the process proceeds to step S83 to shift to power saving. After “8 minutes” is added to the time, the process proceeds to step S80, the printing process is executed, and the process proceeds to step S81.

  In step S81, it is determined whether or not the power is off. If “Yes”, the process ends as it is, and if “No”, the process returns to step S71 and the same process is continued.

  On the other hand, if the determination result is “No” in step S72, the process proceeds to step S73 to determine whether or not “1 minute” has elapsed. Here, “1 minute” corresponds to an interval for determining whether or not a print job has come.

  If the determination result is “No”, the process returns to step S72. If the determination result is “Yes”, the process proceeds to step S74.

  In step S74, it is determined whether or not the power saving transition time has reached the minimum value, and in the case of “No” (corresponding to the section of time t15 to t16 in FIG. 10 and when the print job occurrence frequency is relatively low). In step S75, “8 minutes” is subtracted from the power saving transition time, and then the process proceeds to step S81.

  Further, if “Yes” is determined in step S74, it is determined whether or not the power saving transition time has passed since the transition to step S76. If “No”, the process proceeds to step S81 and “Yes” is determined. In the case of "", the process proceeds to step S77 to execute the process for shifting to the power saving mode, and then proceeds to step S78.

  In step S78, for example, the printer waits (“No” state) while confirming whether a print instruction command is received from the information processing devices PC1, PC2, etc. as external devices, and determines that a print instruction command has been received (“Yes”). In the case of "", the process proceeds to step S59, the return process is executed, and the processes after step S80 are executed.

  As described above, according to the “concentrated job pattern”, the time “8 minutes” is larger than “2 minutes” of the “normal pattern” and “4 minutes” of the “convenient importance pattern”. Therefore, it is possible to make it more difficult to shift to the power saving mode than the “normal pattern” or the “convenience-oriented pattern”, and in a usage mode in which print jobs are concentrated, the user of the printer PR1 Convenience can be further improved.

  Furthermore, in the “concentrated job pattern”, a larger time “8 minutes” is subtracted from the “normal pattern” “2 minutes” or “energy saving priority pattern” “4 minutes”. Therefore, it is possible to shift to the power saving mode earlier than the “normal pattern” or the like in the usage mode in which the printing frequency is low, and energy saving can be improved.

  Next, the power saving transition time change pattern selection process that can be executed by the printer PR1 will be described with reference to the flowchart of FIG.

  In this selection process, the above-mentioned “energy saving emphasis pattern” (FIGS. 5 and 6), “convenience emphasis pattern” (FIGS. 7 and 8), and “concentrated job pattern” (FIGS. 9 and 10) are used. Switching is performed according to the frequency of occurrence of print jobs.

  When this processing is started, first, in step S90, the number of print jobs for the most recent half day is counted. The “last half day” is an example of a predetermined time zone, and is not particularly limited, and may be a predetermined time zone or a time interval.

  Next, in step S91, it is determined whether or not the count number is equal to or less than a first threshold (for example, 5 times). If “Yes”, it is determined that the printing frequency tends to be low, and “energy saving” is determined in step S92. The “important pattern” (FIGS. 5 and 6) is selected and the processing is terminated.

  On the other hand, if “No” is determined in step S91, the process proceeds to step S93 to determine whether or not the count number is equal to or greater than a second threshold (for example, 50 times). Is determined that the printing frequency tends to be high, and the “concentrated job pattern” (FIGS. 9 and 10) is selected in step S94, and the process is terminated.

  On the other hand, if “No” is determined in step S91, the process proceeds to step S95, “convenience-oriented pattern” (FIGS. 7 and 8) is selected, and the process ends.

  Thereby, it can be set as the power saving transition time according to the usage mode of the printer PR1, and both energy saving and convenience can be achieved.

  In the example shown in FIG. 11, the “normal pattern” (FIGS. 3 and 4) is not included in the selection target, but the “normal pattern” may be selected according to the frequency of use.

  In addition, when it is possible to grasp the trend of the usage mode according to the time zone, the power saving transition time change processing (including the above patterns) corresponding to the trend is stored as a database or table associated with the time zone, and the information is stored in the information. Based on the time zone, the power saving transition time changing process may be automatically switched.

  Further, a server or information processing apparatus storing information such as the database or table is connected via the network N shown in FIG. 1, and the server or information processing apparatus is accessed from the printer PR1 or printer PR2, and the time zone is set. It is also conceivable to configure the system so as to obtain information on the usage frequency trend and the corresponding power saving transition time change processing.

  (Second Embodiment)

  Next, a printer PR3 as an image forming apparatus according to the second embodiment of the present invention will be described with reference to FIGS.

  Although not particularly limited, the printer PR3 according to the present embodiment is connected to an information processing apparatus (personal computer) or the like via the network N, similarly to the image forming system S1 according to the first embodiment. Can be used.

  As shown in the block diagram of FIG. 12, the control system of the printer PR3 includes a timer unit 202 that outputs time information, and a first time interval storage that stores the time between the latest print job and the previous print job. Unit 203, a second time interval storage unit 204 that stores the previous print job from the latest and the time between the previous print job, a power saving transition time storage unit 205 that stores a power saving transition time, The quiet period setting unit 206 for setting the time when the job frequency changes temporarily from the state where the optimum power saving transition time is set, and the quiet period set by the quiet period setting unit 206 are stored. And a power saving control unit 209 for performing power saving control based on an adjustment signal from the power saving transition time adjusting unit 208. That. Note that the configuration relating to the printing process is omitted.

  Here, the “low season” means a period in which the printing interval is temporarily relatively long. For example, in a business mode in which printing processing occurs at a certain frequency in normal business, a lunch break, a general meeting, etc. It is a coined word that refers to a period in which almost no printing process occurs for a predetermined time (the printing frequency temporarily decreases).

  The power saving transition time storage unit 205 stores a power saving transition time that is optimally set in advance.

  The “optimally set power saving transition time” is not particularly limited. For example, the power saving transition time changing process (“normal pattern”, “energy saving emphasis pattern”, “consideration of convenience” shown in the first embodiment is used. It is also possible to apply a power saving transition time set at a predetermined time and condition according to “pattern” and “pattern for concentrated job”).

  According to this printer PR3, as will be described later, when the predetermined condition is satisfied, the power saving transition time can be maintained. Therefore, the optimum power saving transition time is appropriately maintained to achieve both energy saving and convenience. Can be made.

  Next, the operation of the printer PR3 will be described with reference to FIGS.

  First, FIG. 13 is an explanatory diagram of the correlation between the print job timing and the state of the printer PR3 for explaining the time charts (A) to (E) shown in FIGS.

  In FIG. 13, numbers on the horizontal axis indicate time, and the unit in this example is “minute”.

  The vertical axis shows three states of the printer PR3 (that is, the printing state, the standby state, and the power saving state).

  An upward arrow below the number on the horizontal axis indicates the timing when the print job is input to the printer PR3.

  Here, it is shown that the latest print job has come to 0 [minute] on the horizontal axis, and one print job has come one by one before 5 [minute] and 10 [minute].

  In this example, it is indicated that the print job that has come every 5 minutes until 0 [minutes] is changed to a state where it does not come in the period B until 60 minutes.

  This state (period) is the quiet period mentioned above.

  Since a print job comes every 5 minutes before 0 [minutes], the optimum power saving transition time is determined to be 6 [minutes] in this example, and the power saving transition time of this printer PR3 is set to 6 [minutes]. It shall be.

  6 [minutes] of the power saving transition time is represented by A, and the vertical axis has shifted to the power saving state at the time of 6 [minutes].

  In addition, the time of the printing state in which the printing process is performed is set to 1 [minute] for each job. Although not shown in FIG. 13, the time for returning to the standby state when a print job is input when the printer PR3 is in the power saving state is 1 [minute] in the time charts (a) to (e).

  Here, with reference to the flowchart of FIG. 16, the power saving transition time maintaining process executed by the printer PR3 according to the present embodiment will be described.

  In this embodiment, the time interval between print jobs is used two times before the latest job.

  As an example of the time interval acquisition method, the print job J1 (−10 [minute]), print job J2 (−5 [minute]), and print job J3 (0 [minute]) in FIG. The first, second, and third jobs will be described as an example.

  First, when it is recognized in step S901 in FIG. 16 that a job J1 (−10 [minutes]) has come, the first time interval storage unit 203 determines that the job J1 is the first job after the power is turned on. In step S902, time information is acquired from the timer unit 202 and stored in step S903.

  Then, the process returns to step S901 and waits for the next job.

  Next, when it is recognized in step S901 that the job J2 (−5 [minutes]) has come, the first time interval storage unit 203 determines that the job J2 is the second job after the power is turned on. In step S902, time information is acquired from the timer unit 202 in step S904, and the time interval between the first job J1 stored in step S903 and the second job J2 acquired this time is calculated (time interval: 5 [minutes]), and this is stored as the time between (the latest job and the previous job).

  At this time, the latest time information and second time information are also stored.

  Then, the process returns to step S901 and waits for the next job.

  Next, when it is recognized in step S901 that the job J3 of 0 [minutes] has come, it is determined in step S902 that the job J3 is the third or subsequent job after the power is turned on, and in step S905, The first time interval storage unit 203 sends the stored time (the latest job to the previous job) to the second time interval storage unit 204, and the second time interval storage unit 204 (the previous job) It is saved as the time between the job and the previous job.

  In step S906, time information is acquired from the timer unit 202, and a time interval between the second job J2 stored in step S904 and the third job J3 acquired now is calculated (time interval: 5 [minutes]). This is stored as the time between (latest job and previous job).

  In addition, the latest time information and the third time information at this time are also stored.

  Next, in step S907, the power saving transition time adjustment unit 208 receives the power saving transition time information from the power saving transition time storage unit 205, the low season time information from the low season time storage unit 207, and the first time interval storage unit 203. The time between the (latest job and the previous job) and the time between the (first previous job and the second previous job) are acquired from the second time interval storage unit 204, and after the print operation of the latest print job is completed. It is determined whether or not the power saving transition time is continued with the power saving transition time set in the previous job printing process stored in the power saving transition time storage unit 205.

  Then, the process returns to step S901 and waits for the next job.

  When the fourth and subsequent jobs come, the third and subsequent processing flows described above are repeated.

  As can be seen from the above description, the timer unit 202 does not need to output time information, and may have a simple structure that outputs a relative time in which the time interval between two jobs can be calculated. Therefore, a software timer can be employed and the cost can be reduced.

  Next, an example of a subroutine of the power saving transition time maintenance determination process in FIG. 16 will be described with reference to the flowchart of FIG.

  First, before explaining this process,

  Power saving transition time is A1,

  A2 during the quiet period (period when no processing related to image formation occurred)

  The time between (latest job and previous job) is T1,

  The time between (one previous job and two previous jobs) is defined as T2.

  And, as will be described later,

A1 + A2 ≧ T1 + T2
And

  When the condition of A1> T1 or A1> T2 is satisfied, the purpose of this process is to maintain the power saving transition time A1.

  In the flowchart of FIG. 17, first, in step S1001, between the power saving transition time A1, the quiet period A2, the time T1 between the (latest job and the previous job), and the (first previous job to the two previous jobs). Time T2 is acquired.

  More specifically, the power saving transition time storage unit 205 saves the power saving transition time A1, the quiet period time storage unit 207 from the quiet period A2, and the first time interval storage unit 203 (the latest job to the previous job). The interval time T1 is acquired from the second time interval storage unit 204 as the interval T2 between the previous job and the previous job.

  Next, at step S1002, it is determined whether or not the condition of A1 + A2 ≧ T1 + T2 is satisfied. Reset and finish the process.

  On the other hand, if “Yes” is determined in step S1002, the process proceeds to step S1003 to determine whether or not the condition of A1> T1 is satisfied.

  If the determination result is “Yes”, the process proceeds to S1004, where it is determined to maintain (continue) the power saving transition time A1, and the process ends.

  On the other hand, if “No” is determined in step S1003, the process proceeds to step S1005 to determine whether or not the condition of A1> T2 is satisfied.

  If the determination result is “No”, it is determined that the power saving transition time is not maintained, the power saving transition time is reset, and the process ends.

  On the other hand, if “Yes” is determined in step S1005, the process proceeds to S1004, where it is determined to maintain (continue) the power saving transition time A1, and the process ends.

  Here, an application example of the above process will be described with reference to FIGS.

  14A to 14C show an example in which the printing frequency before 0 [minute] continues after the quiet period A2, that is, after 60 [minute].

  First, information that the power saving transition time is 6 [minutes] is stored in advance in the power saving transition time storage unit 205, and the quiet period A2 is input as 60 [minutes] from the quiet period setting unit 206. Saved in the storage unit 207.

  (A) in FIG. 14 represents that a print job has been input at time (C) at 60 [minutes]. (C) Since it is a power saving state at the time point, it returns to the standby state after 1 [minute] and starts the printing operation immediately after the return.

  At the time (C), the timer unit 202, the first time interval storage unit 203, and the second time interval storage unit 204 are simultaneously operated, and the first time interval storage unit 203 and the second time interval storage unit are operated. In 204, a time interval T1 between (the latest job and the previous job) and a time interval T2 between (the previous job and the two previous jobs) are held.

  Here, the power saving transition time A1 stored in the power saving transition time storage unit 205, the low season time A2 stored in the low season time storage unit 207, and stored in the first time interval storage unit 203 (latest Suppose that the time interval T1 between the job and the previous job), and the time interval T2 between the (first previous job to the second previous job) stored in the second time interval storage unit 204,

  When the conditions of A1 + A2 ≧ T1 + T2 and A1> T1 or A1> T2 are satisfied, the power saving transition time stored in the power saving transition time storage unit 205 is adopted as the power saving transition time for the current print job.

  In the example of FIG. 14A, the power saving transition time A1: 6 [minutes], the quiet period A2: 60 [minutes], and the time interval T1: 60 [minutes] between (the latest job and the previous job), Since the time interval T2 between the previous job and the previous job is 5 [minutes], if each value is substituted, (6 + 60) ≧ (60) +5) and (6) ≧ (5) are satisfied. The power saving transition time of 6 [minutes] (D) is maintained (continued).

  (B) in FIG. 14 is a continuation of (A) in FIG. 14 and represents that a print job has been input at the point (E) of 65 [minutes].

  Then, at the time (E), the printing operation is started, and at the same time, whether or not the power saving transition time is maintained is calculated in the same manner as described in FIG.

  (E) At the time point, the first time interval storage unit 203 and the second time interval storage unit 204 respectively store the time interval between (the latest job to the previous job) and (the previous job to the previous job). ) Is maintained.

  In this example, the power saving transition time A1: 6 [minutes], the quiet period A2: 60 [minutes], the time interval T1: 5 [minutes] between (the latest job to the previous job), (the previous job to Since the time interval T2 between the two previous jobs) is 60 [minutes], if each value is substituted, (6 + 60) ≧ (5 + 60) and (6)> (5) are satisfied, so that the power saving transition time of 6 [minutes] ] (F) is maintained.

  (C) in FIG. 14 is a continuation of (B) in FIG. 14 and represents that a print job has been input at time (G) at 70 [minutes].

  Then, at the time of (G), the printing operation is started, and at the same time, whether or not the power saving transition time is maintained is calculated in the same manner as described in FIGS.

  (G) At the time, the first time interval storage unit 203 and the second time interval storage unit 204 store the time interval between (the latest job to the previous job) and the (first job to the previous job), respectively. ) Is maintained.

  In this example, the power saving transition time A1: 6 [minutes], the quiet period A2: 60 [minutes], the time interval T1: 5 [minutes] between (the latest job to the previous job), (the previous job to Since the time interval T2 between the two previous jobs) is 5 [minutes], both (6 + 60) ≧ (5 + 5) and (6> 5) hold, and thus the power saving transition time 6 [minutes] (H) is maintained. To do.

  At this time, the influence of the quiet period is lost on the time information of the job two previous to the latest job. In other words, the situation of (a) and (b) in FIG. 14 jumps over without being affected by the power saving transition time due to the existence of the quiet period.

  15D and 15E show an example in which the printing frequency before 0 [minute] does not continue after the quiet period A2, that is, after 60 [minute].

  (D) of FIG. 15 represents that the first latest job after the quiet period A2 is input as the latest print job at the time (I) of 62 [minutes].

At the time (I), the first time interval storage unit 203 and the second time interval storage unit 204 respectively store the time interval between (the latest job to the previous job) and (the previous job to the previous job). ) Is maintained.
In this example, the power saving transition time A1: 6 [minutes], the quiet period A2: 60 [minutes], the time interval T1: 62 [minutes] between (the latest job to the previous job), (the previous job to Since the time interval T2 between two previous jobs) is 5 [minutes], if each value is substituted, (6 + 60) ≧ (62 + 5) is not established. Therefore, it is necessary to set a new power saving transition time without maintaining 6 [minutes] of the power saving transition time until that time (J).

  (E) in FIG. 15 represents that the second latest job after the quiet period A2 is input at the time (K) of 68 [minutes].

  At the time point (K), the first time interval storage unit 203 and the second time interval storage unit 204 store the time interval between (the latest job to the previous job) and (the previous job to the previous job), respectively. ) Is maintained.

  In this example, power saving transition time A1: 6 [minutes], quiet period A2: 60 [minutes], time interval T1: 8 [minutes] between (latest job to previous job), (next job to Since the time interval T2 between two previous jobs) is 60 [minutes], if each value is substituted, (6 + 60) ≧ (8 + 60) is not established. Therefore, it is necessary to set a new power saving transition time without maintaining 6 [minutes] of the power saving transition time until that time (L).

  (Third embodiment)

  Next, with reference to FIGS. 18 and 19, a printer PR4 as an image forming apparatus according to the third embodiment of the present invention will be described.

  Although not particularly limited, the printer PR4 according to the present embodiment is connected to an information processing apparatus (personal computer) or the like via the network N, similarly to the image forming system S1 according to the first embodiment. Can be used.

  As shown in the block diagram of FIG. 18, the control system of the printer PR4 includes a timer unit 802 that outputs time information, and a first time interval storage that stores the time between the latest print job and the previous print job. Unit 803, a second time interval storage unit 804 that stores the previous print job from the latest and the time between the previous print job, a power saving transition time storage unit 805 that stores a power saving transition time, The power saving transition time adjusting unit 808 that adjusts the power saving transition time and the power saving control unit 809 that performs power saving control based on the adjustment signal from the power saving transition time adjusting unit 808 are configured. Note that the configuration relating to the printing process is omitted.

  Next, an embodiment of a subroutine of the power saving transition time maintenance determination process in the power saving transition time maintenance process of FIG. 16 executed by the printer PR4 having the above configuration will be described with reference to the flowchart of FIG.

  First, before explaining this process,

  Power saving transition time is A1,

  The time between (latest job and previous job) is T1,

  The time between (one previous job and two previous jobs) is defined as T2.

  As will be described later, when the condition of A1> T1 or A1> T2 is satisfied, the purpose of this process is to maintain the power saving transition time A1.

  Further, the difference from the second embodiment is that the power saving transition time adjustment unit 808 sets a quiet period time to determine whether or not to maintain the power saving transition time of the previous print job this time. It is a point not to use.

  When the processing of FIG. 19 is started, first in S1101, the power saving transition time storage unit 805 sends power saving transition time A1, and the first time interval storage unit 803 (the latest job to the previous job) time T1. The second time interval storage unit 804 obtains the time (from the previous job to the previous job) and T2.

  Next, in step S1103, it is determined whether or not A1> T1 is satisfied. If satisfied, the process proceeds to step S1104, and it is determined to maintain the power saving transition time A1. If not, the process proceeds to step S1105, and it is determined whether A1> T2 is satisfied.

  If it satisfies, the process proceeds to step S1104, and it is determined to continue the power saving transition time A1. When not satisfying, it progresses to step S1106, determines that it does not continue power saving transition time, and complete | finishes a process.

  (Other embodiments)

  In the above embodiment, the power saving transition time and the job time interval are calculated based on this timing as the timing when the print job is uniformly input to the printer in the above embodiment, but the print processing ends at the start point of the time interval. It is good also as timing.

  In such a case, the time intervals of FIGS. 13 to 15 of the embodiment of the present invention are as follows: job interval before quiet period: 4 [minutes], power saving transition time: 5 [minutes], quiet period time: 59 [minutes]. This is equivalent to reading.

  Here, when the previous job printing time: T3, the previous job power saving return time: T4, and the second previous job printing time: T5, an equation is created in the same manner as in the above embodiment in accordance with the intention of the present invention.

(Power saving transition time + quiet period time + previous job printing time + second previous job printing time) ≧ ((latest to previous) job interval + previous job printing time minus previous job power saving return time + (one Previous to 2 previous) Job interval + 2 previous job print time)
And

  ((Power saving transition time) ≧ ((latest to previous) job interval) or (power saving transition time) ≧ ((1 previous to 2 previous) job interval))

That is, (A1 + A2 + T3 + T5) ≧ (T1 + T3-T4 + T2 + T5) and ((A1 ≧ T1) or (A1 ≧ T2)).

This is: (power saving transition time + quiet period time) ≧ ((latest to previous one) job interval + (one previous to two previous) job interval minus previous job power saving return time) and ((power saving transition time) ) ≧ ((Latest to 1 previous) job interval) or (Power saving transition time) ≧ ((1 to 2 previous) job interval))
That is, (A1 + A2) ≧ (T1 + T2-T4) and ((A1 ≧ T1) or (A1 ≧ T2)) can be transformed.

  -T4 in the above equation is a consideration for the power saving return time from when the previous job in the case shown in FIG. 14 (b) is input as the first job after the idle period until printing is started. .

  Further, in the case of the third embodiment, ((power saving transition time) ≧ ((latest to previous one) job interval) or (power saving transition time) ≧ ((one previous to two previous) job interval) ), That is, ((A1 ≧ T1) or (A1 ≧ T2)), and the form of the equation does not change.

  As for the operation method, there may be a case where a print job is not submitted immediately before the transition to the quiet period. This can happen, for example, if you want to be sure you get a print before moving to a quiet period. In addition, there may be a case where printing does not start immediately after the dawn. This is because it takes time to prepare print data. In consideration of the time zone in which the print job immediately before and after the quiet period is unlikely to be input, the quiet period may be set longer.

  In addition, as an example corresponding to the case where printing does not start immediately after the off-season, considering the postponement of one power saving transition time at the end of the off-season, for the first print job in the off-season, Alternatively, the power saving transition time may be maintained.

  (Power saving transition time + quiet period time + power saving transition time) ≧ ((latest to previous one) job interval + (one previous to two previous) job interval minus previous job power saving return time) and ((power saving transition) Time) ≥ ((Latest to 1 previous) job interval) or (Power saving transition time) ≥ ((1 to 2 previous) job interval))

That is, the power saving transition time is maintained when the conditions of ((A1 × 2) + A2) ≧ (T1 + T2−T4) and ((A1 ≧ T1) or (A1 ≧ T2)) are satisfied.

  As described above, various modifications can be considered within the scope of the present invention.

  Although the invention made by the present inventor has been specifically described based on the embodiments, the embodiments disclosed herein are illustrative in all respects and are not limited to the disclosed technology. Should not be considered. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above embodiment, but should be construed according to the description of the scope of claims. All modifications within the scope of the claims and the equivalent technology are included.

  When using a program, it can be provided via a network or stored in a recording medium such as a CD-ROM.

  The image forming apparatus, the image forming system, and the image forming program according to the present invention can be applied to a laser printer, a full color printer, a fax machine, and the like.

1 is a block diagram showing a configuration of an image forming system S1 according to a first embodiment of the present invention. 1 is a block diagram illustrating a configuration of a printer PR1 according to a first embodiment. FIG. It is a flowchart which shows the process sequence of a power saving transition time change process (normal pattern). It is a time chart which shows the implementation condition of power saving transition time change processing (normal pattern). It is a flowchart which shows the process sequence of a power saving transition time change process (energy saving emphasis pattern). It is a time chart which shows the implementation condition of a power saving transition time change process (energy saving emphasis pattern). It is a flowchart which shows the process sequence of a power-saving transfer time change process (convenient importance pattern). It is a time chart which shows the implementation condition of a power saving transition time change process (convenient importance pattern). It is a flowchart which shows the process sequence of a power saving transition time change process (pattern for concentrated jobs). It is a time chart which shows the implementation condition of power-saving transition time change processing (concentrated job pattern). It is a flowchart which shows the process sequence of the selection process of a power saving transition time change pattern. It is a block diagram which shows the structure of printer PR3 which concerns on 2nd Embodiment. FIG. 7 is an explanatory diagram illustrating a correlation between print job timing and a state of a printer PR3. It is a time chart which shows the example of the execution condition of a power saving transition time maintenance process. It is a time chart which shows the example of the execution condition of a power saving transition time maintenance process. It is a flowchart which shows the process sequence of a power saving transition time maintenance process. It is a flowchart which shows the process sequence of the subroutine of a power saving transition time maintenance determination process. It is a block diagram which shows the structure of printer PR4 which concerns on 3rd Embodiment. It is a flowchart which shows the process sequence of the subroutine of a power saving transition time maintenance determination process. It is a block diagram which shows the structure of conventional printer PR5.

Explanation of symbols

S1 Image forming system PR1, PR2 Printer (image forming apparatus)
100 External interface section 101 Print data editing section 102 Power saving transition time control section (transition means, calculation means, change means, determination means)
103 Software timer (timer)
104 Printing mechanism (image forming means)
105 User interface part (minimum period setting means, maximum period setting means)
202 Timer part (time measuring means)
203 Time interval storage unit 204 Time interval storage unit 205 Power saving transition time storage unit 206 Low season time setting unit 207 Low season time storage unit 208 Power saving transition time adjustment unit 209 Power saving control unit 800 External interface unit 801 Print data editing unit 802 Power saving Transition time control unit 802 Timer unit 803 Hardware timer unit 803 Time interval storage unit 804 Printing mechanism unit 804 Time interval storage unit 805 Print history data storage unit 805 Power saving transition time storage unit 808 Power saving transition time adjustment unit 809 Power saving control unit PC1, PC2 Information processing device PR4 Printer (image forming device)
PR5 printer (image forming device)

Claims (15)

Image forming means for forming an image based on the received print information;
A transition means for transitioning the apparatus itself to a preset power saving mode when a predetermined transition period has elapsed;
Calculating means for calculating the occurrence frequency of processing related to image formation by the image forming means;
Changing means for changing the predetermined transition period according to the occurrence frequency calculated by the calculating means;
An image forming apparatus comprising: A determination means for determining an increase / decrease tendency of the occurrence frequency,
The changing means decreases the predetermined transition period when the determining means determines that the tendency is increasing, and the changing means determines that the predetermined transition is determined when the determining means determines that the tendency is decreasing. The image forming apparatus according to claim 1, wherein the period is increased. Comprising a minimum period setting means for setting a minimum value of the predetermined transition period;
The image forming apparatus according to claim 2, wherein the changing unit does not reduce the transition period to be less than a minimum value set by the minimum period setting unit. A maximum period setting means for setting a maximum value of the predetermined transition period;
The image forming apparatus according to claim 2, wherein the changing unit does not increase the transition period beyond a maximum value set by the maximum period setting unit. Recording means for recording the determination result update by the determination means over a predetermined time period;
Analyzing means for analyzing an increase / decrease tendency of the occurrence frequency in the predetermined time zone based on the update record of the recording means;
The image forming apparatus according to claim 4, further comprising:   The image forming apparatus according to claim 5, wherein the changing unit increases or decreases the predetermined transition period based on an analysis result of the analyzing unit in the predetermined time period.   The image forming apparatus according to claim 1, wherein the changing unit further includes an increase / decrease rate setting unit that sets an increase / decrease rate of the predetermined transition period.   The image forming apparatus according to claim 7, wherein the increase / decrease rate setting unit sets the increase / decrease rate according to the occurrence frequency calculated by the calculation unit.   The image forming apparatus according to claim 7, wherein the increase / decrease rate setting unit sets the increase / decrease rate according to an increase / decrease tendency of the occurrence frequency by the determination unit. The transition time changed by the changing means is A1,
The time from the processing related to the predetermined image formation to the processing related to the previous image formation is T1,
The time from the process related to the predetermined image formation to the process related to the previous image formation is T2,
If
10. The image forming apparatus according to claim 1, further comprising a maintaining unit configured to maintain the transition time A <b> 1 when the condition of A <b>1> T <b> 1 or A <b>1> T <b> 2 is satisfied. The transition time changed by the changing means is A1,
A2 is a period during which the processing relating to the image formation has not occurred.
The time from the processing related to the predetermined image formation to the processing related to the previous image formation is T1,
The time from the process related to the predetermined image formation to the process related to the previous image formation is T2,
If
A1 + A2 ≧ T1 + T2
10. The image forming apparatus according to claim 1, further comprising a maintaining unit that maintains the transition time A <b> 1 when the condition of A <b>1> T <b> 1 or A <b>1> T <b> 2 is satisfied. One or more image forming apparatuses according to any one of claims 1 to 11,
One or more information processing apparatuses connected to the image forming apparatus via a communication unit;
An image forming system comprising: An image forming process for forming an image based on the received print information;
When a predetermined transition period has elapsed, a transition process for transitioning the apparatus itself to a preset power saving mode; and
A calculation process for calculating an occurrence frequency of processing relating to image formation in the image formation process;
A changing process of changing the predetermined transition period according to the occurrence frequency calculated in the calculating process;
An image forming program that causes a computing means to execute the above. A transition process for shifting the image forming apparatus to a preset power saving mode when a predetermined transition period has elapsed;
A calculation process for calculating the occurrence frequency of processing related to image formation;
A changing process of changing the predetermined transition period according to the occurrence frequency calculated in the calculating process;
A printer driver comprising: It further has a determination means for determining an increase / decrease tendency of the occurrence frequency,
The change process decreases the predetermined transition period when it is determined by the determination process that it is increasing, and when it is determined that the change process is decreasing by the determination process, the predetermined transition is performed. The printer driver according to claim 14, wherein the period is increased.

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