JP3501641B2 - Image processing system, image processing method, and storage medium - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing system, an image processing method and a storage medium which are composed of a control device and an image processing device connected to a large-scale network connecting LANs.

[0002]

2. Description of the Related Art Currently, image processing systems perform printing by directly receiving print data. In large-scale networks, LANs (local area networks) in which computers are connected have been actively used in recent years, but large-scale networks in which the networks are connected to each other are also configured. As a result, data can be sent and received to and from other LAN than the LAN used by the user, and other LA connected
By connecting from N to another LAN, it is possible to access a computer on a LAN other than the LAN directly connected and its peripheral devices.

However, the connection is not guaranteed because it goes through a LAN outside the control of the user, and the connection may be interrupted during data communication.

Further, since the data itself is not always created by the user who prints the data, the data is not always guaranteed.

[0005]

However, when the print data is stored in another database, it takes a double labor to download it to the computer used by the user and send it to the image processing system from there. Further, when the communication is unstable like the large-scale network, the user needs to print after receiving the data until the data is successfully loaded.

Further, in the above example, there is a problem that the user has to reprint each time the connection is interrupted.

[0007]

In order to solve the above-mentioned problems, the present invention has the following constitution.

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

That is, the image processing apparatus capable of communicating with the data storage unit storing the print data receives the address information from the host computer, and the data based on the address information received by the receiving unit. Data requesting means for requesting print data to the storing means and loading the print data, a data amount described at the beginning of the print data or a data amount obtained by communication in advance, and the data requesting means Determination means for comparing the amount of print data to determine whether the print data has been loaded successfully, and data for requesting the print data to be resent to the data storage means when the print data fails to load. Retransmission request means is included.

Further, in the above image processing apparatus, when the print data is unsuccessfully loaded, the determining means determines whether or not other print data has arrived, and the determining means determines that the other print data has arrived. In this case, a switching unit that switches the print data according to the number of times of retransmission request being a predetermined number or more is provided.

Alternatively, in the above image processing apparatus,
Retransmission determining means for determining whether the print data loaded from the data storage means is print data in response to a retransmission request, and updating the print data when the retransmission determination means determines that the print data is in response to the retransmission request And an update determination means for determining whether or not has been performed.

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

1 is a sectional view showing the internal structure of a laser beam printer (hereinafter abbreviated as LBP) used in this embodiment. This LBP is a character pattern registration from a data source (not shown). You can register a standard form (form data), etc. In the figure, reference numeral 1000 denotes an LBP main body, which inputs and stores character information (character code) or form information or macro instruction supplied from an externally connected host computer (201 in FIG. 2), and A corresponding character pattern, form pattern, or the like is created according to the information, and an image is formed on a recording paper, which is a recording medium. 1012 is an operation panel on which switches for operation and an LED display are arranged,
A printer control unit 1001 controls the entire LBP 1000 and analyzes character information and the like supplied from the host computer. This control unit 1001
The character information is mainly converted into a video signal having a corresponding character pattern and output to the laser driver 1002. The laser driver 1002 is a circuit for driving the semiconductor laser 1003, and switches on / off the laser light 1004 emitted from the semiconductor laser 1003 according to the input video signal. The laser 1004 is swung in the left-right direction by the rotating polygon mirror 1005 to scan the electrostatic drum 1006. As a result, an electrostatic latent image having a character pattern is formed on the electrostatic drum 1006. This latent image is an electrostatic drum 1006.
After being developed by the surrounding developing unit 1007, it is transferred to a recording sheet. A cut sheet is used for this recording paper,
The cut sheet recording paper is stored in a paper cassette 1008 mounted on the LBP 1000, taken into the apparatus by a paper feed roller 1009 and conveyance rollers 1010 and 1011 and supplied to the electrostatic drum 1006.

FIG. 2 is a block diagram showing the printing apparatus of this embodiment.

Reference numeral 201 denotes the host computer 1, which outputs the address of the database 212 that stores print information consisting of print data and control data to the printer 202.

Reference numeral 202 denotes a printing apparatus, which is 1000 in FIG.
Equivalent to. The printing device 202 is roughly divided into a communication control unit 203, a formatter analysis unit 204, and a drawing memory 20.
5, printer engine unit 206.

A communication control unit 203 communicates with the host computer 201. Address setting unit 21
4, data request unit 215, data remaining amount determination unit 217, data amount search unit 219, password setting unit 220, data comparison unit 221, data update display unit 222, print data switching unit 223, reception buffer switching unit 224, reception buffer The part 225 is included.

A formatter control unit 204 analyzes the print information received from the host computer 201. Here, a print image is created in the drawing memory 205 and sent to the printer engine unit 206. The formatter control unit 204 is composed of a CPU, a RAM, a ROM and the like. The formatter control unit 204 uses the cache saving unit 22.
6, tray switching unit 227 and data read skip unit 228
including.

Reference numeral 205 denotes a drawing memory which stores the print image created by the formatter analysis unit 204 and transfers it to the printer engine unit 206. Drawing memory 2
Reference numeral 05 is a RAM.

A printer engine unit 206 has a printing function for forming a permanent image of a printing image.

Reference numeral 207 denotes a LAN to which the printing device 202 is connected, and L is connected via a router 208 which is a connecting device.
It is connected to AN209.

Reference numeral 208 denotes a router, which is connected to the LAN 207 and L
It is a connecting device that connects AN 209.

Reference numeral 209 is a LAN, and routers 208, 2
11 are connected to the LAN 207 and the LAN 210, respectively.

Reference numeral 210 denotes a LAN, which is connected to the LAN 209 via the router 211.

Reference numeral 211 denotes a router, which is connected to the LAN 209 and L
It is a connection device that connects the AN 210.

Reference numeral 212 denotes a database that stores print data in this embodiment, and transmits print data at the request of the printing device 202. The database 212 is mainly composed of a computer or the like.

Reference numeral 213 is a host computer 2 which outputs print information consisting of print data and control data to the printer 202.

An address storage unit 214 is a means for receiving from a host computer an address on the network in which print data is stored and storing the address and a database storing print data from the host computer 1201 and an address of the data. Receive and store.

A data requesting unit 215 is a means for requesting print data from the database based on the set address, and the address to the database transmitted from the host computer 1 is stored in the address storage unit 214. In this case, the print data is requested to the database indicated by the address. The retransmission request number holding unit 216 is included.

A retransmission request number holding unit 216 holds the number of times the data requesting unit has requested retransmission.

Reference numeral 217 is a means for recognizing that the connection between the LANs has been cut off, comparing the data amount of the sent data with the held data amount, and the sent data amount is small. In this case, the remaining data amount determination unit is a unit that determines that communication has been interrupted. The previously-known print data amount stored in the data amount holding unit 218 is compared with the actually sent data amount. If the actually sent data amount is small, it is determined that the connection between the LANs has been cut off. It makes a judgment and informs the data resend request unit 229. A data amount holding unit 218 is included.

Reference numeral 218 denotes a data amount holding unit which is a unit for holding the data amount obtained at the beginning of data reception,
Holds the amount of data obtained at the beginning of data reception.

A data amount search unit 219 is a means for obtaining a data amount at the beginning of data reception, and obtains the data amount at the beginning of the transmission data and stores it in the data amount holding unit 218.

Reference numeral 220 denotes a password setting unit which is a means for registering a password in preparation for retransmission, and holds the password set by the host computer 1.

Reference numeral 221 denotes a data comparison unit that is a means for checking whether or not the print data has been updated since the last load when printing by resending. In the present invention, the print data creation time is loaded in advance. At the time of resending, the creation time is compared to check that the data has been updated.

A data update display unit 222 is a means for notifying the user that the data has been updated when the data has been updated. Inform the user that it has been updated. In this embodiment, the fact that there has been an update is displayed on the panel of the printing apparatus. In addition, as another embodiment, there is a method of printing and notifying the updated fact.

A print data switching unit 223 is a unit for switching the print data, and gives priority to the print data coming from the other computer based on the condition defined when the print request comes from the other computer. . In the present embodiment, the number of resend requests stored in the resend request number holding unit 216 is obtained, and if the number of failures is n times, the resend request is temporarily stopped and the newly arrived data is given priority and printed. Here, n is a preset number of times, and is a value arbitrarily set by the printer manufacturer, user, or the like.

A reception buffer switching unit 224 switches the print data reception buffer when the print data is switched.

A reception buffer unit 225 is a buffer for receiving print data.

A cache save unit 226 is a means for storing the font cache when the print data is switched, and when the print data is switched, the analysis of the previous print data has already been completed. When it is being performed, the font cache created during the process is saved.

A tray switching unit 227 is a unit that switches the output tray when the print data is switched, and instructs the printer engine unit 206 to switch the tray when the print data is switched.

Reference numeral 228 denotes a data read skip unit that is a data read skip unit, which is a data read skip unit, and stores up to the part where the previous printing is completed and stores the page when analyzing the print data at the time of resending. The formatter analysis unit 204 is instructed to skip the analysis processing up to.

Reference numeral 229 denotes a data resend request unit, which is means for automatically issuing a resend request when recognizing that the communication has been interrupted, and confirms that the communication is interrupted by the remaining data amount determination unit 217. Then, the data request unit 215 is instructed to reload the data.

FIG. 3 is a flow chart for explaining the data processing process according to the present invention. Specifically, it is a means for receiving the address on the network where the print data is stored from the host computer and storing it. An address setting unit 214, a data resend request unit 229 that is a unit that requests the print data indicated by the address to the database indicated by the address, and a resend request automatically when recognizing that the communication is cut off. And a means for recognizing that the connection between the LAN and the data requesting unit 215, which is a means for outputting the data, is compared, and compares the data amount of the sent data with the held data amount, When the amount of transmitted data is small, the data remaining amount determination unit 21 which is means for determining that communication has been interrupted
7, a data amount holding unit 218 that is a unit that holds the data amount obtained at the beginning of data reception, and a data amount searching unit 2 that is a unit that obtains the data amount at the beginning of data reception
19, a password setting unit 220 which is a means for registering a password for resending, and a data comparing unit 221 which is a means for checking whether or not the print data has been updated since the last loading before printing by resending. When there is a data update, the data update display unit 222 is a means for notifying the user that the data has been updated.
And a print data switching unit 223 that is a unit that switches print data, a cache save unit 226 that is a unit that stores a font cache when print data switching occurs, and print data has been switched. 2 is a processing flow of a tray switching unit 227 which is a means for switching output trays and a data reading skipping unit 228 which is a data reading skipping unit, and is a host computer 1 (201) and a host computer 2 (213) in FIG. 2) shows the control processing of the host computer 1 (201), the host computer 2 (213), and the printer 202 when printing is performed from the printer device 202 to the printer 202.

The address setting unit 214 receives the print data and the address of the database 212 storing the print data from the host computer 1 and stores it in the memory area managed by the address setting unit 214 (3
01).

If the password is required to load the print data (302), the host computer 1 also sends the password. The printing apparatus 202 receives the password in the communication control unit 203 and holds it in the password setting unit 220 (303).

The data request unit 215 accesses the database 212 based on the address set in the address setting unit, requests print data, and loads the print data (304). At this time, the request and print data are sent to the router 208, LAN 209, router 211 and LAN.
Transmission / reception is performed via 211. In the present embodiment, only three LANs are passed, but in the present invention, any number of LANs may be passed.

When the print data is loaded, the data amount searching unit 219 obtains the data amount of the print data at the head of the data and holds it in the data amount holding unit 216. In the present embodiment, the data amount is described at the beginning of the data, but as another example, it may be obtained in advance by communication with the database 212 (305).

When the print data has been loaded (3
06-YES), the data remaining amount determination unit 217 compares the amount of data actually sent with the amount of data held in the data amount holding unit 218, and if the amount of sent data is small, For example, it is determined that the transmission / reception path of the data is cut off.

If it is determined that the data loading has failed (306-NO), then it is determined whether other print data is requested. If no other print data has arrived (307-NO), the data resend request unit 229 instructs the data request unit 215 to resend, and the data request unit 21
5 requests print data from the database 212 (31
4) After that, the steps from (303) to (306) are repeated.

If another print data has arrived (307-YES), the print data switching unit 223 can request the retransmission request number holding unit 216 for the retransmission request number. if,
If the retransmission request has not already been issued n times or more (308
-NO), the print data switching unit 223 does not switch the print data, and the data resend request unit 229 does not
The data request unit 215 requests print data from the database 212 (314). Thereafter, (303) to (306) are repeated.

If the resend request has already been issued n times or more (308-YES), the print data switching unit 22
3 notifies the data request unit 215 of data re-transmission and the formatter analysis unit 204 of the switching, and stops the data analysis currently being performed. Further, the reception buffer switching unit 224 is requested to switch the reception buffer (30
9).

The cache save unit 226 saves the currently created font cache when notified of the switching of print data through the formatter analysis unit 204 (310).

The tray switching unit 227 requests the printer engine unit 206 to switch the output tray (31).
1).

The formatter analysis unit 204 develops the switched print data in the drawing memory 205 (312).

The printer engine unit 206 uses the drawing memory 2
The print image developed in 05 is printed (313).

When printing is completed, the print data switching unit 22
3 instructs the data request unit 215 to continue the retransmission (31
4). Thereafter, (303) to (306) are repeated.

If the data has been loaded successfully (306-YES), it is judged whether the data has been retransmitted (315), and if it is the retransmitted data (315-YE).
S), the data comparison unit 221 determines whether the data has been updated (316), and if the data has been updated, displays it on the panel (316-YES, 31).
7).

Then, the data read skip unit 228 skips the print data of the page that has already been printed (318), and the cache save unit 226 restores the saved font cache (3).
19) Instruct the printer engine unit 206 to return the output tray to its original state in the tray switching unit 227 (32
0).

The formatter analysis unit 204 analyzes the print data and develops it in the drawing memory unit (321).

The printer engine unit 206 uses the drawing memory 2
The print image developed in 05 is printed (322).

If the data is not retransmission data (315-N
O), the formatter analysis unit 204 analyzes the print data and expands it in the drawing memory unit (321).

The printer engine unit 206 prints the print image developed in the drawing memory 205. (32
2) FIGS. 4A and 4B are flowcharts for explaining the process of the data read skip unit 228 which is a data read skip unit. 4A shows the details of the control process of the data read skip unit 228 when the communication is interrupted in FIG. 2, and FIG. 4B shows the control process from the host computer 1 (201) to the printer 202 in FIG. The details of the control process of the data read skip unit 228 when the print data is retransmitted will be described.

In FIG. 4A, when it is determined that the communication is cut off (401-YES), the data read skipping unit 228 stores the number of pages of which printing is currently completed (404). Based on this processing, the formatter analysis unit 204 stops printing (405).

If the communication is not cut off (401-N
O), the formatter analysis unit 204 analyzes the print data and develops it in the drawing memory unit (402).

The printer engine unit 206 uses the drawing memory 2
The print image developed in 05 is printed. (403)
In FIG. 4B, if the data to be printed is retransmitted data (406-YES), the page skipping unit 228 determines whether there is the number of pages printed last time, based on whether or not the number of pages is stored ( 407). Here, in the present embodiment, the determination is made based on whether or not the page number is stored, but other means such as setting a flag may be used. If there is the page number (407-YES), the page number is read (loaded) (408). Next, the print data is analyzed (409), and the process advances to the next page and skips reading (410).

Here, in the present embodiment, the process proceeds to the next page by analyzing the print data, but other means may be used as long as the process proceeds to the next page. Further, at this time, the analysis is performed but the print image is not created. If the print page loaded in step 408 has not been reached (411-NO), steps (409) to (4)
If step 10 is repeated and the page is reached (411
-YES), the formatter analysis unit 204 expands the print data in the drawing memory 205 (412), and the printer engine unit 206 prints the print image expanded in the drawing memory 205 (413).

FIG. 5 is a flow chart for explaining the data comparison unit 221 which is means for checking whether or not the print data has been updated since the last load when printing by resending. In FIG. The control processing of the data comparison unit 221 and the data display unit 222 when the print data is loaded is shown.

The print data is loaded (501), and if it is not the resend data (502-NO), the date and time of the data is obtained and stored (503). As a method of acquisition, a method of attaching a creation date and time to data in advance and extracting from it may be used, or the method may be obtained by communicating with a database (503). Then, the print data is printed (508).

If the data is retransmission data (502-YE
S), the date and time of creation of the print data is obtained (505), and if it is different from the stored date and time (506-YE
S), display on the panel (507), and print the print data (508).

FIG. 6 is a flow chart for explaining the password setting unit 220 which is a means for registering a password in preparation for retransmission, and when printing is performed from the host computer 1 (201) to the printing apparatus 202 in FIG. Details of the control process of the password setting unit 220 will be described.

An address is received from the host computer 1 (201) (601), and if a password is set (602-YES), the password setting unit 22
0 saves the password (603). If no password is set (602-NO), the process ends.

FIG. 7 is a flow chart for explaining the cache saving unit 226 which is a unit for saving the font cache when the print data is switched, and in FIG. 2, the host computer 2 (213) to the printing apparatus is used. The control processing of the cache save unit 226 when printing is performed on the area 202 will be described.

In FIG. 7A, when the print data is switched, the cache save unit 226 copies the cache memory to a different memory area (701).

By preparing to print the switched print data by clearing the cache area (S70).
2).

In FIG. 7B, it is determined whether or not the data to be printed is the resend data, and if it is not the resend data (703-NO), the formatter analysis unit 204 expands the print data in the drawing memory 205. Then (706), the printer engine unit 206 prints the print image expanded in the drawing memory 205 (707).

If the resend data is to be printed (703-Y
ES), the cache area is cleared (704), and the cache saving unit 226 restores the contents of the font cache saved in step 701 to the cache area (7).
05).

The formatter analysis unit 204 expands the print data in the drawing memory 205 (706), and the printer engine unit 206 prints the print image expanded in the drawing memory 205 (707).

In this embodiment, the cache area is saved, but a method of switching between a plurality of cache areas and using them may be used.

FIG. 8 is a tray switching unit 2 which is a unit for switching the output tray when the print data is switched.
27 is a flowchart for explaining the processing of No. 27, showing the control processing of the tray switching unit 227 when printing is performed from the host computer 2 213 to the printing apparatus 202 in FIG. 2.

In FIG. 8A, when printing other print data, the tray switching unit 227 checks whether an unused output tray is open. If open (8
01-YES), the currently used output tray position is stored (802), and the printer engine unit 206 is instructed to change the output tray (803).

The formatter analysis unit 204 expands the print data in the drawing memory 205 (804), and the printer engine unit 206 prints the print image expanded in the drawing memory 205 (805).

If there is no open tray (8
01-NO), the tray is not switched, the formatter analysis unit 204 expands the print data in the drawing memory 205 (804), and the printer engine unit 206 sets the drawing memory 2
The print image expanded in 05 is printed (80
5).

In FIG. 8B, when printing the retransmitted print data, the tray switching unit 227 makes a step 80.
It is checked whether or not there is a tray stored in step 2, and if there is (806-YES), the printer engine unit 206 is instructed to switch to the output tray (807).

The formatter analysis unit 204 expands the print data in the drawing memory 205 (808), and the printer engine unit 206 prints the print image expanded in the drawing memory 205 (809).

[0102]

[Effects of the Embodiment] The image processing apparatus downloads print data from the data storage unit connected by the LAN network based on the print address information, and determines from the data amount obtained as a result whether or not the download is successful. If we determine that the data is incomplete, we will automatically process the resend request,
At that time, the waiting time can be eliminated by prioritizing the presence and absence of other received print jobs and the number of resends.

[0103]

Other Embodiments The present invention can be applied to a system composed of a plurality of devices (for example, host computer, interface device, reader, printer, etc.).
It may be applied to an apparatus including one device (for example, a copying machine, a facsimile apparatus, etc.).

It goes without saying that the present invention can also be applied to the case where it is carried out by supplying a program to a system or an apparatus. In this case, the medium storing the program according to the present invention constitutes the present invention. Then, by reading the program from the storage medium to the system or device, the computer (or CPU or MPU) of the system or device
It works in a predetermined way.

As a storage medium for supplying the program code, for example, a floppy disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD
-R, magnetic tape, non-volatile memory card, ROM, etc. can be used.

Further, by executing the program code read by the computer, not only the functions of the above-described embodiment are realized, but also the OS (operating system) running on the computer based on the instruction of the program code. It is needless to say that this also includes a case where the above) performs a part or all of the actual processing and the processing realizes the functions of the above-described embodiments.

Further, after the program code read from the storage medium is written in the memory provided in the function expansion board inserted into the computer or the function expansion unit connected to the computer, based on the instruction of the program code, It goes without saying that a case where the CPU or the like included in the function expansion board or the function expansion unit performs some or all of the actual processing and the processing realizes the functions of the above-described embodiments is also included.

When the present invention is applied to the above-mentioned storage medium, the storage medium stores the program code corresponding to the above-described flowchart. Briefly, the memory map example of FIG. Each module shown will be stored in the storage medium. That is, at least "address setting module 901""data request module 902""data resend request module 903""data remaining amount determination module 904""data amount holding module 905""data amount search module 906""password setting module 907" Store the program code of each module of “data comparison module 908”, “data update display module 909”, “print data switching module 910”, “reception buffer switching module 911”, “analysis module 912”, and “output processing module 913” in a storage medium. Good.

The image processing system reads the print data from the data storage unit connected by the LAN network based on the print address information, and determines from the read control information obtained as a result whether or not the download is successful. When it is determined that the data is incomplete, the resend request process is automatically performed, and at that time, it is possible to prioritize the presence / absence of another received print job and the number of resends to eliminate the waiting time.

The user does not need to download the print data each time, and the user does not need to specify the print again when the connection of the LAN network is cut off, so that the user interface can be improved.

Furthermore, when a resend request is issued and printing is performed, the previously printed data is judged not to be printed again and skipped, so that the printing speed is improved and wasteful printing is suppressed and the cost is reduced. Can be encouraged.
The update of the print data can be notified and confirmed to the user by the data update display means.

When a password is required to send and receive print data, the password setting means for registering and managing the password at the time of initial input eliminates the need to input the password at the time of resend processing.

Further, even when the print data is switched, the switching processing means of the receiving tray can perform printing without mixing the already printed paper and the paper on which the other print data is printed. .

Furthermore, the font cache save means can prevent the contents of the font cache from being changed by printing other print data, and the cache hit efficiency can be improved.

According to the present invention, when the address information from the host computer is received, the print data is requested to the data storage means based on the received address information, and the data amount described at the head of the print data is sent. Alternatively, by comparing the data amount obtained through communication in advance and the data amount of the print data loaded from the data storage means, it is determined whether or not the print data has been successfully loaded, and the print data loading fails. In this case, by requesting the print data to be retransmitted to the data storage means, the user does not need to download the print data each time, and the user does not need to specify print again even when the connection is cut off, improving the user interface. You can

[0115]

[Brief description of drawings]

FIG. 1 is an LB that is a printing apparatus according to an embodiment of the present invention.
It is sectional drawing of P.

FIG. 2 is a block diagram showing a basic configuration of a host computer and a printing apparatus according to the first embodiment.

FIG. 3 is a flowchart illustrating print processing according to the first exemplary embodiment.

FIG. 4 is a flowchart illustrating a skip process of print data according to the first exemplary embodiment.

FIG. 5 is a flowchart showing a data update check process according to the first embodiment.

FIG. 6 is a flowchart showing a password setting process in the first embodiment.

FIG. 7 is a flowchart showing an output tray switching process in the first embodiment.

FIG. 8 is a flowchart showing a cache saving process according to the first embodiment.

FIG. 9 is a diagram showing a memory map in the embodiment.

[Explanation of symbols]

1000 laser beam printer 1001 printer control unit 1002 laser driver 1003 Semiconductor laser 1004 laser light 1005 rotating polygon mirror 1006 electrostatic drum 1007 Development unit 1008 paper cassette 1009 paper feed roller 1010 Paper carrying roller 1011 Paper carrying roller 1012 Operation panel 201 Host computer 1 202 Printing device (laser beam printer) 203 Communication control unit 204 Formatter analysis unit 205 drawing memory 206 Printer engine part 207 LAN 208 router 209 LAN 210 LAN 211 router 212 Database 213 Host computer 2 214 address setting section 215 Data request section 216 Retransmission Request Number Holding Unit 217 Data remaining amount determination unit 218 Data amount holding unit 219 Data amount search section 220 Password setting section 221 Data comparison unit 222 Data update display section 223 Print data switching unit 224 Receive buffer switching unit 225 Receive buffer section 226 Cache save unit 227 Tray switching unit 228 Data skipping section 228 Data resend request unit

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G06F 3/12 B41J 29/00

Claims (5)

(57) [Claims] 1. An image processing apparatus capable of communicating with a data storage unit storing print data, the receiving unit receiving address information from a host computer, and based on the address information received by the receiving unit, A data requesting unit that requests print data to the data storing unit and loads the print data, a data amount described at the beginning of the print data or a data amount obtained by communication in advance, and the data requesting unit. A judgment means for comparing the data amount of the loaded print data to determine whether or not the print data has been successfully loaded, and a request for resending the print data to the data storage means when the print data is unsuccessfully loaded. An image processing apparatus, comprising: 2. A determination means for determining whether or not another print data has arrived when the print data has failed to be loaded, and a resend request count when the determination means determines that another print data has arrived. Is greater than or equal to a predetermined value,
The image processing apparatus according to claim 1 , further comprising a switching unit that switches print data. 3. A resend determination unit that determines whether the print data loaded from the data storage unit is print data based on a resend request, and a case where the resend determination unit determines that the print data is based on a resend request. The image processing apparatus according to claim 1 or 2 , further comprising: an update determination unit that determines whether or not the print data has been updated. 4. An image processing method executed in an image processing apparatus capable of communicating with a data storage unit storing print data, comprising: a receiving step of receiving address information from a host computer; and a receiving step received by the receiving step. A data request step of requesting print data from the data storage means based on address information and loading the print data, and a data amount described at the beginning of the print data or a data amount obtained by communication in advance. , A determination step of comparing the data amount of the print data loaded by the data request step to determine whether or not the print data has been loaded successfully; An image processing method, comprising: a data resend request step of requesting resend to the data storage means. 5. A storage medium storing a program code for causing a computer to execute a process in an image processing apparatus capable of communicating with a data storage unit storing print data, the receiving medium receiving address information from a host computer. A code, and based on the address information received by processing the received code, request print data to the data storage means,
A data request code for loading the print data, a data amount described at the beginning of the print data or a data amount obtained by communication in advance, and a data amount of the print data loaded by the processing of the data request code. And a data resend request code for requesting resend of the print data to the data storage means when the print data is unsuccessfully loaded. A storage medium characterized by.