JP2007307790A - Printer, control method for the same, program and network printing system for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to cause a print server to operate at a speed suitable for operation condition of itself (a printer). <P>SOLUTION: The printer sets power source voltage fed to the print server at a high voltage (S110) when the operation condition of itself is in a full operation condition (condition where sheets are fed before printing or head cleaning is executed), sets the source power voltage fed to the print server at a middle voltage (S120) when the operation condition of itself is in a busy condition (condition where printing is executing or sheets is discharged after printing), and sets the power source voltage fed to the print server at a low voltage (S130) when the operation condition of itself is in a standby condition, and supplies thus set power source voltage to the print server (S140). The print server operates at a high speed when the power source voltage fed from the printer is the high voltage, operates at a middle speed when the power source voltage is the middle voltage, and operates at a low speed when the power source voltage is the low voltage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a printing apparatus, a control method thereof, a program thereof, and a network printing system.

2. Description of the Related Art Conventionally, a network printing system is known that includes a print server connected to a network and a printing apparatus that is connected to the print server and supplies power to the print server. For example, in Patent Document 1, when a print server sets an operation clock frequency, a high-speed printer having a high power supply capability is set to a high frequency to provide a high processing capability, and a low-speed printer having a low power supply capability. In contrast, it is disclosed that a low frequency is set to suppress current consumption and provide a processing capability suitable for the printer.
Japanese Patent No. 347086

  By the way, in Patent Document 1, since the print server simply sets the operation clock frequency based on the power supply capability of the printer, the data is transmitted to the printer at the highest speed regardless of the operating state of the printer. For example, if the print server sends data to the printer at the highest speed while the printer is executing print processing, the printer buffer memory will soon run out of space and data cannot be sent from the print server. Data transmission waiting occurs. When this data transmission wait time becomes longer, there is no free space in the data buffer of the print server, and as a result, flow control is performed to suppress data transmission from computers on the network. Once in this state, the print data stored in the buffer memory of the printer is consumed by the printing process, and after the buffer memory is emptied, the data may be transmitted from the print server after a while. In this case, the printing process in the printer is once interrupted and then restarted, which causes a problem that color unevenness is likely to occur before and after the interruption of the printing process.

  The present invention has been made to solve such a problem, and provides a printing apparatus capable of operating a print server at a speed suitable for its operating state, a control method thereof, and a program thereof. Is one of the purposes. Another object of the present invention is to provide a network printing system including such a printing apparatus.

  The present invention adopts the following means in order to achieve at least one of the above objects.

The printing apparatus of the present invention includes:
A printing apparatus that is connected to a print server connected to a predetermined network, receives print data received by the print server from a computer device on the network via the print server, and prints based on the print data. ,
An output means for outputting a frequency setting signal used by the print server to set an operation clock frequency to the print server;
An operating state recognition means for recognizing its own operating state;
Control means for setting the frequency setting signal based on the recognized operating state of the self and controlling the output means so that the set frequency setting signal is output to the print server;
It is equipped with.

  The printing apparatus recognizes its own operating state, sets a frequency setting signal used by the print server to set an operation clock frequency based on the recognized own operating state, and sets the set frequency setting. Control to output a signal for printing to the print server. Therefore, the print server can be operated at a speed suitable for its operating state.

  In the printing apparatus of the present invention, the output means outputs a power supply voltage to the print server as the frequency setting signal, and the control means determines the magnitude of the power supply voltage based on the recognized operating state. And the output means is controlled so that a power supply voltage of the set magnitude is output to the print server, and the print server may set the operation clock frequency based on the magnitude of the power supply voltage. Good. In this case, since the power supply voltage is used as the frequency setting signal, it is not necessary to perform communication processing as compared with the case of using the signal exchanged in the communication between the print server and the printing apparatus as the frequency setting signal. There is room for processing capacity. At this time, the print server may be set so that the operation clock frequency increases as the power supply voltage increases.

  Thus, in the printing apparatus of the present invention using the power supply voltage as the frequency setting signal, the control means recognizes the recognized power supply voltage when setting the magnitude of the power supply voltage based on the recognized operating state. A power supply voltage corresponding to an operation clock frequency at which the amount of print data sent from the print server per unit time is an amount that does not interrupt the print processing when its own operating state is executing the print processing May be set. In this way, since the printing process being executed is not interrupted, color unevenness that occurs before and after the interruption of the printing process does not become a problem.

  Further, in the printing apparatus of the present invention using a power supply voltage as a frequency setting signal, the control means sets the recognized self-power when setting the magnitude of the power supply voltage based on the recognized operating state of the self. When the operation state is a standby state, the print server may be set to a power supply voltage corresponding to an operation clock frequency at which the print server enters a standby state. In this way, both the printing apparatus and the print server can be put into a standby state.

  The printing apparatus of the present invention may include an inkjet printing mechanism. In the ink jet printing mechanism, color unevenness is likely to occur before and after interruption of the printing process, and therefore, the significance of applying the present invention is high.

The control method of the printing apparatus of the present invention includes:
Method of controlling a printing apparatus connected to a print server connected to a predetermined network and receiving print data received by the print server from a computer device on the network via the print server and printing based on the print data Because
(A) a step of recognizing its own operating state;
(B) setting a frequency setting signal used by the print server to set an operation clock frequency based on the operating state recognized in step (a);
(C) controlling to output the frequency setting signal set in step (b) to the print server;
Is included.

  In this printing apparatus control method, the self-operating state is recognized, and based on the recognized self-operating state, a frequency setting signal used by the print server to set the operation clock frequency is set, and the setting is performed. Control is performed so that the frequency setting signal is output to the print server. Therefore, the print server can be operated at a speed suitable for its operating state. In this printing apparatus control method, various aspects of the above-described printing apparatus may be adopted, and steps for realizing each function of the above-described printing apparatus may be added.

  The program of the present invention is for causing one or more computers to realize the steps of the above-described printing apparatus control method. This program may be recorded on a computer-readable recording medium (for example, hard disk, ROM, FD, CD, DVD, etc.), or from a computer via a transmission medium (communication network such as the Internet or LAN). It may be distributed to another computer, or may be exchanged in any other form. If this program is executed by one computer or if each computer is assigned to each step and executed, each step of the above-described printing apparatus control method is executed. The following effects can be obtained.

The network printing system of the present invention
A print server connected to a predetermined network and receiving print data from a computer device on the network;
A printing apparatus connected to the print server and receiving print data received by the print server via the print server and printing based on the print data;
A network printing system comprising:
The printing apparatus includes: an output unit that outputs a frequency setting signal used by the print server to set an operating clock frequency to the print server; an operating state recognition unit that recognizes its operating state; Control means for setting the frequency setting signal based on its own operating state and controlling the output means so that the set frequency setting signal is output to the print server.

  The printing apparatus constituting the network printing system recognizes its own operating state, and sets a frequency setting signal used by the print server to set the operation clock frequency based on the recognized own operating state. The set frequency setting signal is controlled to be output to the print server. Therefore, the print server can be operated at a speed suitable for its operating state. The printing apparatus constituting the network printing system may adopt various aspects of the above-described printing apparatus, and may add steps for realizing the functions of the above-described printing apparatus. .

  An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of the network printing system 10, FIG. 2 is a block diagram showing a schematic configuration of a clock generation circuit 31 constituting the print server 20, and FIG. 3 is a block diagram showing a schematic configuration of a printer 40. .

  As shown in FIG. 1, the network printing system 10 according to the present embodiment includes a print server 20 connected to a network 60 represented by Ethernet (registered trademark) using TCP / IP as a protocol, and the print server 20. And a connected inkjet recording printer 40.

  The print server 20 is configured as a microcomputer centered on a CPU 21, and sets a flash ROM 22 that stores programs, a RAM 23 that temporarily stores data, and a network interface 24 connected to a network 60. The network interface controller 25, the printer interface controller 27 for setting the printer interface 26 connected to the printer 40, the power supply voltage supplied from the printer 40 via the printer interface 26 is monitored, and the power supply voltage A clock generation circuit 31 that generates an operation clock frequency corresponding to the magnitude based on a signal obtained from the transmitter 28, and these are connected so that data can be exchanged via the bus 30. There. The print server 20 further includes a constant voltage power supply circuit 29 that generates a constant voltage (for example, 3.3 V) from the power supply voltage supplied from the printer 40 and supplies the constant voltage to each unit of the print server 20.

  As shown in FIG. 2, the clock generation circuit 31 divides the frequency signal of 25 MHz output from the transmitter 28 into a frequency signal of 16 Hz by the clock frequency dividing circuit 32a, and outputs this as a signal for measuring time. The frequency signal of 800 MHz obtained by multiplying the frequency signal of 25 MHz output from the timer circuit 32 and the transmitter 28 by the clock multiplier circuit 33 is divided to output three types of frequency signals of 200 MHz, 100 MHz, and 66 MHz. A clock frequency dividing circuit 34; a 30V voltage comparator 35 that compares the power supply voltage supplied from the printer 40 with a predetermined high voltage threshold (30V) and outputs the comparison result as a 30V flag value; The power supply voltage supplied from 40 is compared with a predetermined low voltage threshold (10 V), and the comparison result is set to a 10 V flag. 10V voltage comparator 36 that outputs as a value, and a clock selection signal for detecting a change in the power supply voltage based on the values of the 30V flag and the 10V flag and selecting a clock frequency corresponding to each value of the 30V flag and the 10V flag And a clock output for selecting and outputting a signal having a clock frequency corresponding to the clock selection signal among the three types of frequency signals generated by the clock frequency dividing circuit 34. A selector 38, and a 3V voltage comparator 39 that compares a power supply voltage supplied from the printer 40 with a predetermined minimum voltage threshold (3V) and outputs a reset signal when the power supply voltage is less than the minimum voltage are provided. Yes. In this embodiment, normally, the power supply voltage supplied from the printer 40 is any one of 42V, 20V, and 5V. As shown in Table 1, when the power supply voltage is 42V, the 30V flag has the value 1, and the 10V flag has the value. 1 and the operation clock frequency corresponding to these values is set to 200 MHz (current consumption 300 mA). When the power supply voltage is 20 V, the 30 V flag has the value 0 and the 10 V flag has the value 1, and the operation clock corresponding to these values. The frequency is set to 100 MHz (current consumption 180 mA). When the power supply voltage is 5 V, the 30 V flag has the value 0, the 10 V flag has the value 0, and the operation clock frequency corresponding to these values is set to 66 MHz (current consumption 140 mA). The

  As shown in FIG. 3, the printer 40 includes a printer ASIC 50 that performs control of an inkjet printer engine 41 that performs printing based on print data input from the outside, and an input / output interface 51 connected to the print server 20. An input / output controller 52 for setting, an operation panel 53 for displaying information such as a print menu and inputting user instructions, and a main controller 54 for controlling the entire printer 40 are provided. Various control signals and data can be exchanged through the network. The printer 40 has a power supply circuit 58 that rectifies and converts an AC power supply into a DC power supply or converts a DC power supply voltage into a different voltage. The power supply circuit 58 supplies a DC power supply to each part of the printer 40. Or supply DC power to the print server 20 via the input / output interface 51.

  The printer engine 41 includes a carriage 44 on which a print head 42 and an ink cartridge 43 are mounted, a carriage belt 47 that is stretched over a drive motor 45 and a driven motor 46 and can move the carriage 44 in the main scanning direction (direction a in FIG. 3). A transport roller 48 capable of transporting the printing paper P from the back to the front of the print head 42, that is, in the sub-scanning direction (b direction in FIG. 3), and the ink clogging of the print head 42 provided at the right end in the main scanning direction And a cap 49 used as a place where forced ink ejection is performed. The printer engine 41 applies pressure to the piezoelectric elements in the print head 42 and deforms the piezoelectric elements to pressurize the ink in the ink cartridge 43 and eject the ink toward the printing paper P. Instead of the piezoelectric element, a method may be employed in which a voltage is applied to a heating resistor (for example, a heater) to heat the ink to generate bubbles in the ink and pressurize the ink with the bubbles. The printer ASIC 50 is an integrated circuit manufactured for controlling the printer engine 41. When a print command is received from the main controller 54, the print start position of the print paper P is printed based on the print data that is the target of the print command. The rotation of the conveying roller 48 is controlled so as to be disposed at a position facing the head 42, and the drive motor 45 and the print head 42 are arranged so that ink is ejected from the print head 42 in the main scanning direction from the printing start position. To control. The operation panel 53 is a touch panel type liquid crystal display. For example, the operation panel 53 displays a print menu for printing an image file or detects that the user presses various buttons displayed on the print menu, and outputs the detection signal. Or transmitted to the main controller 54. The main controller 54 is configured as a microcomputer centered on the CPU 54a, and temporarily stores the ROM 54b for storing programs, the RAM 54c for temporarily storing data, and the print data sent from the print server 20. A buffer memory 54d for outputting print data in accordance with the printing speed is provided. The power supply circuit 58 converts the voltage of the DC power source obtained by rectifying the AC power source into a voltage set by the main controller 54 and supplies the voltage to the print server 20 via the input / output interface 51 or to each part of the printer 40. Circuit.

  Next, the operation of the printer 40 configuring the network printing system 10 of the present embodiment configured as described above will be described. FIG. 4 is a flowchart showing an example of a power supply voltage supply routine executed by the main controller 54 of the printer 40. This routine is repeatedly executed at every predetermined timing (for example, every several seconds). When the power supply voltage supply routine is executed, the main controller 54 first recognizes its own operating state (step S100). Here, the self-operating state is one of a full operating state, a busy state, and a standby state. The full operation state is a state in which paper is fed or the head cleaning is executed before printing, and the busy state is a state in which the printer engine 41 executes printing or discharges paper. The standby state is a state in which operations such as class paper discharge, head cleaning, and printing are not performed. The head cleaning is a state in which the drive motor 45 is rotationally driven until the print head 42 comes to a position immediately above the cap 49 and the carriage 44 is moved by the carriage belt 47, and then the print head 42 is covered with the cap 49. This is a process for forcibly discharging solid matter clogged in a nozzle (not shown) of the print head 42 by generating a negative pressure in the cap 49 by a suction pump (not shown). This head cleaning is executed immediately after the printer 40 is turned on or when a predetermined cleaning execution timing comes. Further, since it is necessary to rotate the drive motor 45 in the full operation state and the busy state, a high voltage (42V) power is supplied from the power supply circuit 58 to each part of the printer 40, and energy saving is achieved in the standby state. For this purpose, a low voltage (5 V) power is supplied from the power supply circuit 58 to each part of the printer 40.

  When the self-operating state is the full operating state in step S100, since there is no trouble on the printer 40 side even if the print server 20 operates at high speed, the power supply voltage supplied from the power supply circuit 58 to the print server 20 is set. The high voltage (42V) is set (step S110), the set power supply voltage is supplied to the print server 20 (step S140), and this routine ends. 5, it is assumed that the main controller 54 of the printer 40 determines that the printer 40 is in a full operation state immediately after the power is turned on and supplies a high voltage (42 V) to the print server 20. Then, the voltage change detector 37 of the print server 20 detects that both the value of the 30V flag and the value of the 10V flag have changed from the value 0 state to the value 1 state, and 200 MHz in accordance with Table 1. A clock selection signal for selecting the clock frequency is sent to the clock output selector 38. The clock output selector 38 that has received the clock selection signal outputs a clock frequency of 200 MHz as the operation clock frequency. As a result, the print server 20 operates at high speed.

  On the other hand, when the operating state is busy in step S100, if the print server 20 operates at high speed, the amount of print data per unit time sent from the print server 20 to the printer 40 becomes large, and the buffer memory Since there is no free space of 54d and print data transmission from the print server 20 may be intermittent, the power supply voltage supplied from the power supply circuit 58 to the print server 20 is intermediate to operate the print server 20 at medium speed. The voltage (20V) is set (step S120), the set power supply voltage is supplied to the print server 20 (step S140), and this routine ends. Now, assume that the main controller 54 of the printer 40 has changed from the full operation state to the busy state and supplies the intermediate voltage (20 V) to the print server 20 at the arrow b in FIG. Then, the voltage change detector 37 of the print server 20 detects that the value of the 30V flag and the value of the 10V flag both change from the value 1 to the state where the 30V flag has the value 0 and the 10V flag has the value 1. Referring to Table 1, a clock selection signal for selecting a clock frequency of 100 MHz is transmitted to the clock output selector 38. The clock output selector 38 that has received the clock selection signal outputs a clock frequency of 100 MHz as the operation clock frequency. As a result, the print server 20 operates at a medium speed. Here, when the operation clock frequency of the print server 20 is 100 MHz, the print data sent from the print server 20 to the printer 40 is accumulated in the buffer memory 54d, and the print data in the buffer memory 54d is printed. It is in a state of being balanced with the decreasing speed. Therefore, there is no situation where the buffer memory 54d runs out of space and print data transmission from the print server 20 becomes intermittent. Incidentally, when the transmission of print data is intermittent, the print data is transmitted from the print server 20 after the print processing of the print data stored in the buffer memory 54d of the printer 40 is completed and the buffer memory 54d becomes empty. In this case, since the printing process in the printer 40 is interrupted and resumed, color unevenness is likely to occur before and after the interruption of the printing process. However, in this embodiment, print data transmission does not become intermittent in the first place, so print processing is not interrupted, and color unevenness that occurs before and after interrupting print processing does not become a problem.

  Note that immediately after the setting of the power supply voltage supplied from the power supply circuit 58 to the print server 20 is switched from the high voltage (42 V) to the intermediate voltage (20 V), the power supply voltage supplied to the print server 20 is a high voltage due to the influence of the capacitor. Gradually decreases toward the intermediate voltage and reaches 30 V in the middle of the decrease (see arrow B), the print server 20 switches the operating clock frequency from 200 MHz to 100 MHz. As described above, a time lag is generated between the arrow b and the arrow B, but the time lag does not cause any particular trouble.

  Further, when the operation state is the standby state in step S100, the power supply voltage supplied from the power supply circuit 58 to the print server 20 is set to a low voltage (5 V) in order to stop the operation of the print server 20 in order to save energy. (Step S130), the set power supply voltage is supplied to the print server 20 (step S140), and this routine ends. Now, assume that the main controller 54 of the printer 40 has changed from the busy state to the standby state and supplies a low voltage (5 V) to the print server 20 at the arrow c in FIG. Then, the voltage change detector 37 of the print server 20 detects that the 30V flag has the value 0 and the 10V flag value 1 has changed to the state in which the 30V flag has the value 0 and the 10V flag has the value 0. Then, a clock selection signal for selecting a clock frequency of 66 MHz is transmitted to the clock output selector 38. The clock output selector 38 that has received the clock selection signal outputs a clock frequency of 66 MHz as the operation clock frequency. As a result, the print server 20 operates at a low speed.

  Immediately after the setting of the power supply voltage supplied from the power supply circuit 58 to the print server 20 is switched from the intermediate voltage (20 V) to the low voltage (5 V), the power supply voltage supplied to the print server 20 is the intermediate voltage due to the influence of the capacitor. When the voltage gradually decreases toward the low voltage and reaches 10 V (see arrow C), the print server 20 switches the operation clock frequency from 100 MHz to 66 MHz. As described above, a time lag occurs between the arrow c and the arrow C, but this time lag does not cause any particular trouble.

  Here, the correspondence between the components of the present embodiment and the components of the present invention will be clarified. The printer 40 of the present embodiment corresponds to the printing apparatus of the present invention, the power supply circuit 58 corresponds to the output unit, and the main controller 54 corresponds to the operating state recognition unit and the control unit. In the present embodiment, the operation of the printer 40 and the operation of the print server 20 are described to clarify an example of the control method of the printing apparatus of the present invention and the network printing system of the present invention.

  According to the embodiment described above in detail, the printer 40 recognizes its own operating state, and sets the power supply voltage used by the print server 20 to set the operating clock frequency based on the recognized own operating state. Then, control is performed so that the set power supply voltage is output to the print server 20. Therefore, the printer 40 can cause the print server 20 to operate at a speed suitable for its operating state.

  Further, since the printer 40 uses the power supply voltage as a signal for setting the operation clock frequency of the print server 20, there is no need for performing communication processing, so that there is a margin in processing capability.

  Further, when the printer 40 is in a busy state in which printing is being executed, the amount of print data sent from the print server 20 per unit time is an amount that does not interrupt the printing process. Since the power supply voltage (20 V) corresponding to the operation clock frequency (100 MHz) is set, color unevenness that occurs before and after interruption of the printing process does not become a problem.

  Furthermore, since the printer 40 sets the power supply voltage (5 V) corresponding to the operation clock frequency (66 MHz) at which the print server 20 is also in the standby state when the operation state of the printer 40 is in the standby state, the printer 40 and the print server 20 Both can be in standby state.

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  In the above-described embodiment, the print server 20 sets the operation clock frequency according to the magnitude of the power supply voltage of the printer 40. However, the print server 20 performs communication processing with the printer 40 based on a predetermined communication protocol. A signal for setting the operation clock frequency may be sent from the printer 40 to the print server 20 during the communication process. However, in this case, it is necessary to divide a part of the capability of the CPU 54a for communication processing. Therefore, when the processing capability of the CPU 54a is low, the power supply voltage is used as a signal for setting the operation clock frequency as in the above-described embodiment. Is preferably used.

  In the above-described embodiment, the power supply voltage supplied from the printer 40 to the print server 20 has three levels of high voltage (42V), intermediate voltage (20V), and low voltage (5V). It may be 4 stages or more. Moreover, since each voltage value is only an example, another value may be adopted.

  In the above-described embodiment, the operation clock frequency of the print server 20 is set to three stages of high frequency (200 MHz), intermediate frequency (100 MHz), and low frequency (66 MHz), but the operation clock frequency may be set to two stages. There may be more stages. Further, since the frequency value is merely an example, another value may be adopted.

  In the above-described embodiment, the ink jet printer 40 has been described as an example. However, the present invention may be applied to an electrophotographic laser printer, a dot impact printer, and the like, and in addition to a printer for color printing, a monochrome printer. The present invention may be applied to a printer for printing.

1 is an explanatory diagram showing a schematic configuration of a network printing system 10. FIG. 2 is a block diagram showing a schematic configuration of a clock generation circuit 31 of the print server 20. FIG. FIG. 2 is a block diagram illustrating a schematic configuration of a printer. The flowchart of a power supply voltage supply routine. FIG. 3 is an explanatory diagram showing a transition of a power supply voltage supplied to the print server.

Explanation of symbols

10 Network Printing System, 20 Print Server, 21 CPU, 22 Flash ROM, 23 RAM, 24 Network Interface, 25 Network Interface Controller, 26 Printer Interface, 27 Printer Interface Controller, 28 Transmitter, 29 Constant Voltage Power Supply Circuit, 30 Bus, 31 clock generator circuit, 32 timer circuit, 32a clock divider circuit, 33 clock multiplier circuit, 34 clock divider circuit, 35 30V voltage comparator, 36 10V voltage comparator, 37 voltage change detector, 38 clock output selector, 39 3V voltage comparator, 40 printer, 41 printer engine, 42 print head, 43 ink cartridge, 44 carriage, 45 drive motor, 46 driven motor, 4 7 Carriage belt, 48 Transport roller, 49 Cap, 50 Printer ASIC, 51 Input / output interface, 52 Input / output controller, 53 Operation panel, 54 Main controller, 54a CPU, 54b ROM, 54c RAM, 54d Buffer memory, 55 Bus, 58 Power circuit, 60 network, P printing paper.

Claims (8)

A printing apparatus that is connected to a print server connected to a predetermined network, receives print data received by the print server from a computer device on the network via the print server, and prints based on the print data. ,
An output means for outputting a frequency setting signal used by the print server to set an operation clock frequency to the print server;
An operating state recognition means for recognizing its own operating state;
Control means for setting the frequency setting signal based on the recognized operating state of the self and controlling the output means so that the set frequency setting signal is output to the print server;
Printing device with The output means outputs a power supply voltage as the frequency setting signal to the print server,
The control means sets the magnitude of the power supply voltage based on the recognized operating state of the self and controls the output means so that the power supply voltage of the set magnitude is output to the print server;
The print server sets the operation clock frequency based on the magnitude of the power supply voltage;
The printing apparatus according to claim 1. The control means, when setting the magnitude of the power supply voltage based on the recognized operating state of the self, is sent from the print server when the recognized operating state of the self is executing a printing process. Set the power supply voltage corresponding to the operation clock frequency at which the amount of print data per unit time is such that the print processing is not interrupted;
The printing apparatus according to claim 2. The control means sets the power supply voltage based on the recognized self-operating state. When the recognized self-operating state is a standby state, the control means is an operation clock that causes the print server to enter a standby state. Set to the power supply voltage corresponding to the frequency,
The printing apparatus according to claim 2 or 3. With an inkjet printing mechanism,
The printing apparatus according to claim 1. Method of controlling a printing apparatus connected to a print server connected to a predetermined network and receiving print data received by the print server from a computer device on the network via the print server and printing based on the print data Because
(A) a step of recognizing its own operating state;
(B) setting a frequency setting signal used by the print server to set an operation clock frequency based on the operating state recognized in step (a);
(C) controlling to output the frequency setting signal set in step (b) to the print server;
A control method for a printing apparatus including:   A program for causing one or more computers to realize each step of the control method for a printing apparatus according to claim 6. A print server connected to a predetermined network and receiving print data from a computer device on the network;
A printing apparatus connected to the print server and receiving print data received by the print server via the print server and printing based on the print data;
A network printing system comprising:
The printing apparatus includes: an output unit that outputs a frequency setting signal used by the print server to set an operating clock frequency to the print server; an operating state recognition unit that recognizes its operating state; Control means for setting the frequency setting signal based on its own operating state and controlling the output means so that the set frequency setting signal is output to the print server.
Network printing system.

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