JP5064702B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus, and more particularly to a technique related to a power source of an auxiliary apparatus such as a sheet feeding apparatus that is selectively provided and attached.

  Conventionally, in some cases, an auxiliary device such as a sheet feeding device or a sheet post-processing device is selectively provided to an image forming apparatus according to an order. In this case, if power is simply supplied from the image forming apparatus side to the attachment apparatus, for example, if the power consumption increases due to the sheet feeding apparatus having a lift mechanism, the power supply capacity is exceeded on the image forming apparatus side. There is a risk that the forming process will be down.

In view of this, it has been proposed to separately provide a power converter, that is, a regulator that converts a commercial AC voltage into a predetermined DC voltage in the image forming apparatus for the accessory device (see Patent Document 1).
FIG. 8 is a view of a system in which the image forming apparatus and the accessory device are connected as seen from the back. In Patent Document 1, as shown in FIG. 8, the printer main body 110B sends a control signal and power to the option paper deck 113B via the third connector 120B and the third power cable 119B. To supply. Further, the printer main body 110B supplies a control signal and power to the optional sheet post-processing device 114B via the fourth connector 122B and the fourth power cable 121B to the sheet post-processing device 114B. In addition to the power converter for the printer main body 110B, a power converter for an optional device is attached to the third connector 120B.
JP-A-2003-370423

  As described above, in Patent Document 1, the power converter for the accessory device is provided separately from the power converter for the image forming apparatus main body. For this reason, a user who does not wish to attach an accessory device will feel that the power converter that he / she does not use is reflected in the price of the main body of the image forming apparatus.

  In addition, since a plurality of power converters are provided for a user who wants to attach an accessory device, the power use efficiency deteriorates and the cost of using the commercial power supply increases. In addition, the user does not necessarily desire all of the plurality of attached devices, and for example, it is assumed that only the sheet feeding device is desired and the sheet post-processing device is not desired.

  Therefore, it is conceivable to provide a power storage unit such as a secondary battery or a capacitor that is cheaper than the power converter in each accessory device without providing a plurality of power converters in the image forming apparatus main body. In this case, it is necessary to optimize the operation of the accessory device in consideration of the charge amount of the power storage unit (synonymous with the power storage amount or the remaining capacity, the same applies hereinafter).

The present invention has been made under such a background. The object of the present invention is to reduce the cost of the image forming apparatus , and as a power source for a sheet feeding apparatus which is an additional apparatus connected to the image forming apparatus. when mounting the power storage unit in the sheet feeding apparatus is to optimize the operation of the sheet feeding apparatus.

To achieve the above object, the present invention includes a stacking portion for stacking sheets that are used for image formation, and a feeding section for feeding the sheets stacked on the stacking unit, thereby lifting the loading unit In an image forming apparatus to which a sheet feeding device having a lifting unit and a power storage unit that supplies power for driving the lifting unit is connected , the power storage unit and the image forming device based on power supplied from a commercial power source A power generation unit that generates a plurality of power supply voltages including a power supply voltage for the image forming apparatus, and when the sheet feeding device is connected to the image forming apparatus, the power is supplied from the power generation unit. In addition to the charging control unit for charging the power storage unit , the sheet feeding unit for feeding sheets separately from the feeding device, and the input job is a job for using the sheet feeding device, and is necessary for the job. The number of feeds is If serial greater than feedable number corresponding to the storage amount of the power storage unit, and the execution order of the job to postpone to perform other jobs in smaller number than the paper feeding number of sheets, the power storage of the power storage unit If the amount is less than the power consumed by the sheet feeding device during execution of the other job, execution of the other job using the sheet feeding means instead of using the sheet feeding device And a job control means for continuing the process.

According to the present invention, it is not necessary to separately provide a power converter for the sheet feeding apparatus in the main body of the image forming apparatus, and not only can the price of the image forming apparatus be reduced, but also the power storage in the sheet feeding apparatus. With the provision of the section, the execution mode of the job using the sheet feeding device can be optimized according to the amount of power stored in the power storage section.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 is a cross-sectional view showing a schematic configuration of an image forming apparatus according to an embodiment of the present invention. In FIG. 1, a sheet supply apparatus 100 as an attached apparatus that is selectively provided is connected to a side surface of the image forming apparatus main body 400. The image forming apparatus main body 400 is configured as a copying machine, and a document reading device 412 is provided on the upper surface. The document reading device 412 has a scanner and an automatic document feeder. The scanner optically reads a document, converts it into electronic image data, and sends the image data to the image forming apparatus main body 400. The automatic document feeder discharges the original from the optical reading position after conveying the original to the optical reading position.

  The image forming apparatus main body 400 includes an electrophotographic printer unit 406. That is, the exposure scanning device 405 of the printer unit 406 modulates the laser beam based on the image data output from the scanner, and exposes and scans the photosensitive drum 408 with the laser beam. By this exposure scanning, an electrostatic latent image reflecting the image data is formed on the surface of the photosensitive drum 408. The electrostatic latent image is developed with toner, and the toner image for development is transferred onto a sheet. The transferred toner image is fixed on the sheet by the fixing device 410.

  The image forming apparatus main body 400 includes sheet cassettes 401 to 402 for storing sheets of various sizes. Further, the image forming apparatus main body 400 temporarily stores sheets on which images are formed on one side when forming images on both sides of the sheet, and intermediate trays 403 to 404 for transporting them again to the image transfer position. have.

Note that the image forming apparatus main body 400 serves as a power supply device, and one regulator (power converter) 301 (see FIG. 3) that transforms an AC voltage of a commercial power source into various DC voltages necessary for the image forming apparatus main body 400. have.

  In the sheet feeding apparatus 100, a storage 102 for storing a large number of sheets is provided inside the housing 101. The storage 102 can be pulled out / accommodated with respect to the housing 101. In addition, the storage 102 is provided with a lifter plate 103 that is lifted and lowered by a lifter drive motor 111, and a large number of sheets S can be stacked on the lifter plate 103.

  When the sheet S is replenished on the lifter plate 103, the storage 102 is pulled out from the housing 101. The sheet S on the lifter plate 103 is in a state where the front and rear, right and left positions thereof are aligned by the front end restricting plate 104, the rear end restricting plate 105, and a side restricting plate (not shown). As a result, the sheet S can be supplied to the image forming apparatus main body 400 with a stable posture and timing.

  A sheet sensor 106 and a sheet feeding mechanism 200 are provided above the storage case 102. The sheet feeding mechanism 200 includes a pickup roller 201, a separation roller pair 202, and a drawing roller pair 204 in order from the upstream.

  The pickup roller 201 lifts the lifter plate 103 so that the height of the uppermost sheet on the lifter plate 103 is the upper limit position, and the sheet S (plain paper) is loaded in a state where the lift-up position is fixed. Up to 20 cards can be picked up. The separation roller pair 202 separates one sheet at a time when two or more sheets S are picked up by the pickup roller 201. The drawing roller pair 204 pulls the separated sheet S from the separation roller pair 202 and feeds it to the image forming apparatus main body 400.

  As shown in FIG. 2, the sheet sensor 106 includes a light emitting element 106a and a light receiving element array 106b. In the light receiving element array 106b, a plurality of light receiving elements are linearly arranged. Further, the light emitting element 106a and the light receiving element array 106b are arranged so that the sensor output signal is turned on when the angle θ formed by the incident light and the reflected light with respect to the sheet S is in a predetermined range. (Not shown).

  That is, it is assumed that the lifter plate 103 is lifted up so that the height position of the uppermost sheet S on the lifter plate 103 is the upper limit position, and feeding of the sheet S is started with the lift-up position fixed. . In this case, the sheet sensor 106 keeps the sensor output signal ON until the above-mentioned 20 sheets (plain paper) are fed, and the sheet S on the lifter plate 103 is further reduced. Is configured such that the sensor output signal is OFF.

  In other words, when the sheet sensor 106 starts feeding the sheet S in the above-described state, the pickup operation of the sheet S by the pickup roller 201 is disabled, and the lifter plate 103 needs to be lifted up. Is provided to detect.

  Next, a configuration mainly including the power supply system of the image forming apparatus main body 400 and the sheet feeding apparatus 100 will be described. As illustrated in FIG. 3, the image forming apparatus main body 400 includes a power converter 301, a main body load 302, and a control unit 303. The sheet feeding apparatus 100 includes a charging circuit 304, a power storage unit 305, and an optional load 306.

  The power converter 301 converts the AC voltage from the commercial power supply 300 into various DC voltages required by the image forming apparatus main body 400. As the main body load 302, there are various chargers, sheet conveyance motors, and the like in addition to the above-described document reading device 412, photosensitive drum 406, fixing device 410. The control unit 303 is configured with a CPU as a core, and includes peripheral devices and a load driver. The control unit 303 not only controls various operations of the image forming apparatus main body 400 but also controls the sheet feeding operation and the like of the sheet feeding device 100. The control unit 303 has a function of communicating with an external device such as a computer connected to a network such as a LAN, and can accumulate and print data requested for printing from the external device.

  Note that an application program that performs processing corresponding to the flowcharts of FIGS. 4 to 5 and 7 described later is stored in a memory 303a such as a ROM as a peripheral device of the control unit 303.

  The charging circuit 304 of the sheet feeding apparatus 100 charges the power storage unit 305 according to a command from the control unit 303 using the DC voltage supplied from the power converter 301. The power storage unit 305 supplies power (DC voltage) to the option load 306. The power storage unit 305 can be formed of a rechargeable secondary battery or a capacitor. Examples of the optional load 306 include the sheet sensor 106, the lifter driving motor 111, the sheet feeding mechanism 200, and the like.

  In the case where the power storage unit 305 includes a capacitor, it is desirable to use an electrolytic capacitor having a relatively large power storage capacity. Among them, it is desirable to use an electric double layer capacitor that is particularly excellent in terms of rated voltage, storage capacity, number of charge / discharge cycles, and the like.

  Next, an outline of print job execution control by the control unit 303 will be described based on the flowchart of FIG.

  When the power switch (not shown) of the image forming apparatus main body 400 is turned on, the control unit 303 determines whether there is a print job (step S401). As a result, if there is no print job, the control unit 303 supplies power from the power converter 301 to the charging circuit 304 and instructs the charging circuit 304 to charge (charge) the power storage unit 305 (step S402). Return to step S401.

  If there is no print job even after returning to step S401 in this way, the control unit 303 continues charging without canceling the charge command unless the full charge signal from the charging circuit 304 is turned ON. Further, when the full charge signal is turned on when there is no print job, the control unit 303 drives the lifter drive motor 111 to raise the lifter plate 103 so that the uppermost sheet S on the lifter plate 103 is moved. Try to reach the upper limit position.

  Further, if the power of the power storage unit 305 is consumed by the lifting operation of the lifter plate 103, the control unit 303 turns off the full charge signal from the charging circuit 304, and if the print job has not yet occurred, A charge (power storage) command for power storage unit 305 is issued to 304.

  By such control, when the printing process is not performed for a predetermined time or more, the power storage unit 305 is fully charged during that time, and the uppermost sheet S on the lifter plate 103 is positioned at the upper limit position. Therefore, the number of sheets S that can be continuously fed with the electric power of the power storage unit 305 can be increased as much as possible.

  If it is determined in step S401 that there is a job, the control unit 303 performs job selection processing shown in FIG. 5 (step S403). Next, the control unit 303 performs the job execution process shown in FIG. 6 (step S404), and returns to step S401.

  Next, an example of job selection processing in step S403 in FIG. 4 will be described based on the flowchart in FIG.

  Note that this job selection process selects only print jobs that are to be printed using the sheet feeding apparatus 100, and print jobs that are to be printed using the sheet cassettes 401 and 402 in the image forming apparatus main body 400. Shall not be selected. For print jobs for which execution time reservation is set, only print jobs whose execution time has already arrived are selected.

  Further, for print jobs that are printed using the sheet feeding apparatus 100, the ID numbers described later are in ascending order such as 1, 2, 3,... It shall be granted. When a print job is executed, the print job is deleted, and ID numbers are reassigned to the remaining print jobs in the oldest order.

  The control unit 303 initializes the variable ID to “1” in order to execute the print jobs in the order of the generated print jobs (oldest order) (step S501). Next, the control unit 303 acquires the number of fed sheets necessary for executing the print job related to the ID number indicated by the variable ID (step S502). Next, the control unit 303 determines whether or not the required number of sheets is less than or equal to the number of sheets that can be fed by the sheet feeding apparatus 100 (step S503). A method of calculating the number of sheets that can be fed will be described later with reference to FIG.

  If the required paper supply number is less than or equal to the paper supplyable number, the control unit 303 selects the print job associated with the ID number indicated by the variable ID (step S507), and returns to the main flow of FIG. On the other hand, if the required number of sheets to be fed is larger than the number of sheets that can be fed, the control unit 303 increments the ID number of the variable ID by “1” (step S504).

  Next, the control unit 303 determines whether or not the ID number indicated by the incremented variable ID is larger than the number of print jobs to be executed (step S505). As a result, if the ID number indicated by the variable ID is less than or equal to the number of print jobs to be executed, the control unit 303 returns to step S502.

  On the other hand, if the ID number indicated by the incremented variable ID is larger than the number of print jobs to be executed, the control unit 303 selects the oldest print job whose ID number is “1” (step S506). Return to the main flow of FIG. Thus, when returning to the main flow of FIG. 4, a job execution process described later is performed.

  Note that the fact that the ID number indicated by the incremented variable ID is greater than the number of print jobs to be executed means that the required number of sheets to be supplied is greater than the number of sheets that can be supplied in all the print jobs to be executed. . In other words, in this embodiment, when there are a plurality of print jobs, priority is given to print jobs that can be printed out with the number of sheets less than or equal to the number of sheets that can be fed, in the order of execution in the order of old print jobs. Running.

  Next, a method for calculating the number of sheets that can be fed will be described with reference to FIG. In one lift-up operation of the lifter plate 103, that is, in a state where the lifter plate 103 is lifted up so that the height of the uppermost sheet on the lifter plate 103 becomes the upper limit position, and the lift-up position is fixed The number of sheets S on the lifter plate 103 that can be fed is defined by the ability of the pickup roller 201 and the thickness of the sheet S.

  Here, as shown in FIG. 6A, it is assumed that the number n of sheets of plain paper related to one lift-up operation of the lifter plate 103 is 20.

  The amount of power consumed by one lift-up operation and the amount of power consumed by the operation of the sheet feeding mechanism 200 when feeding 20 plain papers that can be fed by one lift-up operation Calculate the total power consumption. In the present embodiment, as shown in FIG. 6B, the total power consumption W1 related to one lift-up is 3% of the storage capacity of the battery 305 that supplies the lift-up power. Is assumed.

  Note that the amount of power consumed by one lift-up operation is substantially constant regardless of the number of sheets S stacked on the lifter 103. When the number of stacked sheets is large, the sheet weight increases, but the lift amount decreases accordingly, and when the number of stacked sheets is small, the sheet weight decreases, but the lift amount increases accordingly. It is.

  Here, if the storage amount of the battery 305, that is, the current charge amount W (see FIG. 6C) can be detected, the number of sheets that can be fed can be calculated by the calculation shown in FIG. Since the charge amount W can be detected by a known charge management technique, the description of the charge amount W detection process is omitted here.

  As shown in FIG. 6D, the sheet feedable number SE can be calculated as (n / W1) × W. Here, the number n of sheets of plain paper related to one lift-up operation is 20 sheets, and the total power consumption W1 related to one lift-up is 3% of the capacity of the battery 305. In the charged state, the number of sheets SE that can be fed is 666. These 666 sheets are sufficient for normal print processing.

  Next, the job execution process in step S404 in FIG. 4 will be described in detail based on the flowchart in FIG.

  The control unit 303 determines whether or not the execution of the print job selected in step 506 or S506 in FIG. 5 has ended (step S701). As a result, if the execution of the selected print job is completed, the process returns to the main flow of step S4.

  On the other hand, if the execution of the selected print job has not been completed, the control unit 303 drives the sheet feeding mechanism 200 to feed one sheet S when the feeding timing comes (step S3). S702, S703). Then, the control unit 303 determines whether or not the output signal of the sheet sensor 106 has changed to OFF (step S704).

  In this case, if the output signal of the sheet sensor 106 remains ON, as described above, the lifter plate 103 is lifted up until the uppermost sheet on the lifter plate 103 reaches the upper limit position. This means that the sheet can be fed even if the sheet feeding operation is continued in a fixed state. Therefore, if the output signal of the sheet sensor 106 remains ON, the control unit 303 returns to step S701.

  On the other hand, when the output signal of the sheet sensor 106 changes to OFF and sheet feeding from the sheet feeding device 100 becomes impossible at the lift-up position, the control unit 303 determines that the current charge amount W of the battery 305 is Then, it is determined whether or not the total power consumption W1 related to the above-described one lift-up is greater than or equal to (step S705). As a result, if the current charge amount W of the battery 305 is equal to or greater than the total power consumption W1 related to the one lift-up described above, the control unit 303 drives the lifter drive motor 111 to lift the lifter plate 103. Up (step S706). Thereafter, the control unit 303 returns to step S701 to continue execution of the print job.

  In this case, the control unit 303 lifts up the lifter plate 103 until the uppermost sheet S on the lifter plate 103 reaches the upper limit position. Further, the control unit 303 determines that the uppermost sheet S on the lifter plate 103 has reached the upper limit position when the output signal of the sheet sensor 106 changes from OFF to ON, and the ON state continues for a while. It can be recognized by the changed timing.

  If it is determined in step S705 that the current charging amount W of the battery 305 is less than the total power consumption W1 related to one lift-up, the control unit 303 determines that the cassette has run out of sheets. It is determined whether or not ACC (Auto Cassette Change: hereinafter referred to as ACC) for continuing paper feeding by switching to the cassette is possible (step S707).

  In this ACC, when a sheet cassette that is currently feeding paper cannot be fed due to some factor (usually no paper), another sheet cassette that is loaded with the same size and type of sheets. This is a function for continuing the print job by feeding paper from. The conditions for performing this ACC include that sheets of the same size and type can be stacked on other sheet cassettes, and that sheet feeding operations from those sheet cassettes are possible, and the image forming apparatus main body For example, the setting of 400 allows ACC. In this embodiment, in step S707, it is determined whether or not ACC is possible for the sheet cassettes 401 and 402 in the image forming apparatus main body 400.

  If it is determined in step S707 that ACC is possible, the control unit 303 performs ACC (step S708). Then, the control unit 303 continues execution of the print job by returning to step S701.

  On the other hand, if it is determined that ACC is impossible, the control unit 303 temporarily stops the execution of the print job, supplies power from the power converter 301 to the charging circuit 304, and the charging circuit 304 causes the battery 305 to be connected. Charging is performed (step S709). Then, the control unit 303 proceeds to step S709 and performs the above-described lift-up.

  In the charging process in step S709, the current print job is terminated as much as possible by stopping the charging process when the charge amount W of the battery 305 reaches the total power consumption W1 related to one lift-up. It is desirable to complete it promptly. That is, there are few cases where the execution timings of a plurality of print jobs compete with each other, and the image forming apparatus main body 400 has a much longer pause time than a print job execution time. Accordingly, when the image forming apparatus main body 400 is fully charged during the rest period, the image forming apparatus main body 400 can be efficiently used as a whole.

  As described above, the control unit 303 charges the power storage unit 305 using the power supplied from the power converter 301 in the image forming apparatus main body 400 at the time of waiting for job execution. . In addition, when executing a print job using the sheet feeding apparatus 100, the control unit 303 determines that the print job of the print job is less than the power consumed by the execution of the print job. The execution is postponed.

  In addition, when it is necessary to lift up the lifter plate 103 during execution of a print job using the sheet feeding apparatus 100, the control unit 303 satisfies the amount of power stored in the power storage unit 305 to the power to be lifted up. If not, execution of the print job is continued using the sheet cassette in the image forming apparatus main body 400.

  Further, when the sheet cassette cannot be used when the lift-up is necessary, the control unit 303 temporarily stops the execution of the print job, charges the power storage unit 305 by the charging circuit 304, and then lifter plate 103. And the execution of the print job is continued.

  Therefore, it is not necessary to separately provide a power converter for the sheet feeding apparatus 100 in the image forming apparatus main body 400, and the price of the image forming apparatus main body 400 can be reduced. Further, with the provision of the power storage unit 305 in the sheet feeding apparatus 100, it is possible to optimize the execution form of a print job that uses the sheet feeding apparatus 100 in accordance with the amount of power stored in the power storage unit 305. .

  The present invention is not limited to the above-described embodiment, and can be applied to, for example, an accessory device other than the sheet feeding device, for example, a sheet post-processing device. Further, instead of the sheet sensor 106, for example, a distance measuring sensor or the like may be used.

  Another object of the present invention is to supply a storage medium storing software program codes for realizing the functions of the above-described embodiments to a system or apparatus, and a computer (or CPU, MPU, etc.) of the system or apparatus. It is also achieved by reading and executing the program code stored in the storage medium.

  In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code and the storage medium storing the program code constitute the present invention.

  Examples of the storage medium for supplying the program code include a floppy (registered trademark) disk, a hard disk, a magneto-optical disk, a CD-ROM, a CD-R, a CD-RW, a DVD-ROM, a DVD-RAM, and a DVD. An optical disc such as RW or DVD + RW, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used. Alternatively, the program code may be downloaded via a network.

  Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (operating system) or the like running on the computer based on the instruction of the program code. Includes a case where part or all of the actual processing is performed and the functions of the above-described embodiments are realized by the processing.

  Furthermore, after the program code read from the storage medium is written to a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the expanded function is based on the instruction of the program code. This includes a case where a CPU or the like provided on the expansion board or the expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.

1 is a cross-sectional view illustrating a schematic configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a configuration of a sheet sensor provided in the sheet feeding device. 3 is a configuration diagram illustrating a configuration mainly including a power supply system of an image forming apparatus main body and a sheet feeding apparatus. FIG. 5 is a flowchart illustrating an outline of print job execution control using a sheet feeding apparatus. 5 is a flowchart showing details of job selection processing in the flowchart of FIG. 4. FIG. 10 is a diagram for explaining a method for calculating the number of sheets that can be fed by the sheet feeding apparatus. 5 is a flowchart showing details of job execution processing in the flowchart of FIG. 4. It is a figure which shows the structure of the apparatus which concerns on patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Sheet feeding apparatus, 103 ... Lifter plate, 111 ... Lifter motor, 200 ... Sheet feeding mechanism, 300 ... Commercial power supply, 301 ... Power converter, 303 ... Control part, 303a ... Memory, 304 ... Charging circuit, 305 ... Power storage unit, 400 ... Image forming apparatus main body, 401, 402 ... Sheet cassette

Claims (3)

A stacking portion for stacking sheets that are used for image formation, and a feeding section for feeding the sheets stacked on the stacking portion, and a lift portion for lifting the loading unit, the power to drive the lifting unit In an image forming apparatus connected to a sheet feeding device having a power storage unit for supplying
A power source generating unit that generates a plurality of power source voltages including a power source voltage for the power storage unit and the image forming apparatus based on power supplied from a commercial power source;
When the sheet feeding device is connected to the image forming apparatus, a charging control unit that charges the power storage unit using power supplied from the power generation unit;
Separately from the feeding device, a sheet feeding means for feeding a sheet;
If the input job is a job that uses the sheet feeding apparatus and the number of sheets required for the job is larger than the number of sheets that can be fed according to the amount of electricity stored in the electricity storage unit, the execution order of the jobs is changed. When the other job is executed later than the number of sheets that can be fed , and the amount of power stored in the power storage unit is less than the power consumed by the sheet feeding apparatus during the execution of the other job. Includes a job control unit that continues execution of the other job using the sheet feeding unit instead of using the sheet feeding device ;
An image forming apparatus comprising: If the sheet feeding unit cannot feed the same type of sheet with the same size as the sheet in the sheet feeding apparatus, the job control unit temporarily stops the job being executed and the power storage unit the image forming apparatus according to claim 1, wherein said by driving the elevating unit thereby resuming the stopped job temporarily after being charged. 3. The image formation according to claim 1, wherein the charging control unit charges the power storage unit using electric power supplied from the power generation unit during a standby state waiting for execution of a job. apparatus.

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