JP2931784B2 - Printer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a printer for sequentially printing different data, for example, on a medium such as printing paper at high speed.

[0002]

2. Description of the Related Art As a method of recording predetermined information on a medium such as paper so as to be visually recognizable, a method of recording the same information on a large amount of medium at high speed by a printing machine using a printing plate is known. Also, a method of printing arbitrary data on a relatively small number of media at a low speed by a printer used as a terminal device of a computer or the like is well known.
However, there is also a demand for printing a large amount of variable data, that is, different data, for example, one by one at a high speed, and high-speed printers have been put to practical use.

[0003] Such a printer apparatus for printing variable data at a high speed includes a conveying means for conveying a print medium at a high speed, a printing means for recording an image at high speed on a sheet conveyed by the conveying means, and a printing means for sequentially inputting. It is composed of control means for appropriately controlling data so that the data is appropriately printed on paper. As the printing means, for example, a method of performing printing by an inkjet method using an inkjet head is applied. As such a high-speed printer device that performs printing by the ink jet method, for example, a device that performs printing at a speed of 15 sheets per second or more for A4 size printing paper at 5 m / s has been put to practical use.

[0004] In addition, such high-speed printers are applied to a large number of prints and different numbers or contents, such as stock certificates, various vouchers, or a large number of bills to a large number of customers. There is printing of documents that must be printed. When printing such important documents, it is necessary to completely prevent defects such as duplication or omission of the printed content, and also to perform poor printing such as blurring or crushing, and to reduce line width and shading variation. High quality printing is not allowed, and accurate data must be printed with high quality.

[0005]

However, in such a high-speed printer, when a printing failure occurs, if the operator is late in noticing the state, an enormous amount of defective printed matter is produced. , Waste printing resources,
This causes enormous loss in terms of time and cost, and raises the problem of an increase in printing cost. Therefore, when a large number of defective prints are likely to occur, there is a demand for detecting the defective prints as quickly as possible and stopping the apparatus. On the other hand, once such a large-scale printer device is stopped, various recovery operations and adjustment operations must be performed before printing starts again, resulting in a great loss of time, and an increase in printing efficiency. Is reduced. Therefore, if there is some printing failure, make it possible to remove the defective printing,
There is also a demand for continuous printing work.

Furthermore, when printing such important documents as described above in such a printer device, it is necessary to completely eliminate print defects, and for that purpose, there is a demand to inspect individual printed matter. However, it is naturally impossible to visually inspect printed matter printed at a speed of 10 sheets or more per second in real time, and even if individual printed matter is inspected after being printed, a huge number of workers and a huge number of Time is required, and it is almost impossible for a human to inspect the printed matter sequentially by visual inspection. For this reason, there is a problem that the printed matter cannot be sufficiently inspected, and the possibility of shipping a defective printed matter cannot be completely eliminated. In any case, in such a printer device, it is strongly demanded to be able to detect a printing failure by checking a printing state and at the same time to specify a defective printed matter.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a highly reliable printer capable of precisely inspecting the print result of each printed material, thereby eliminating defective printed materials and performing accurate and high quality printing. It is in.

[0008]

In order to solve the above problems, an image printed on paper or the like is read by a sensor, and the read image is matched with an original image input to a printer device for printing. Then, it is possible to check whether the read image, that is, the image printed on paper or the like is appropriate.

Accordingly, the printer device of the present invention, the
A pre-printer that sequentially prints different data for each print medium at high speed
Printer device, the bits of a sequentially input print image.
Print image that stores map data for each predetermined page
Memory and a predetermined area including areas that do not overlap each other
And a plurality of heads each having the same printing area.
Is stored in the print image memory.
First printing means for printing a print image on a printing medium
And predetermined readings that include areas that do not overlap each other
A plurality of sensors having an area, and the plurality of sensors
Read the printed image on the printing medium
Image sensor means and the read image
Read image stored in bitmap format for each fixed page
Memory and the print image memory on demand.
Bitmap data of the stored print image and
And the read image stored in the read image memory.
Each bitmap data is compressed, and each compressed image is compressed.
Image compression means for generating bitmap data
Of the print image stored in the print image memory.
Bitmap data or before the bitmap data
The compressed bitmap data is selectively used as reference data.
The read image stored in the read image memory.
Page bitmap data or the bitmap data
Bitmap data and template match
And detecting those differences, based on the amount of the differences
Determining whether the state of the printing is appropriate or inappropriate;
Inspection means for inspecting the state of printing by the printing means;
As a result of the inspection, the printing status is determined to be inappropriate
On a predetermined item printed on the print medium,
A mark of a predetermined image that effectively disables the print item
And second printing means for performing printing in a superimposed manner.

Preferably, the second printing means includes
Invalid printing of the print target medium at a predetermined position on the print medium
Is further printed .

[0011] Preferably, the first printing means comprises
If the printing status is determined to be inappropriate as a result of the inspection,
In this case, the printing is stopped .

More specifically, the printing means includes an ink jet printer.
A print head, and the inkjet printing method
Printing is performed on the printing medium . More specifically, the image sensor
The means has a time delay integration type (TDI) CCD sensor.
And the printing performed at high speed by the sensor is performed.
Read the image on the print target medium .

[0013]

Figure a first embodiment of the printer apparatus of the embodiment of the invention Form invention of the first embodiment 1 Figure 1
3 will be described. The printer device according to the first embodiment is a large-scale printing system that prints print data input from a host computer at a high speed by using a plurality of inkjet heads. It is designed to be able to detect defective contents and print quality.

First, the configuration of each part of the printer of the first embodiment will be described with reference to FIGS. FIG. 1 is a block diagram illustrating a configuration of a printer device 100 according to the first embodiment. The printer device 100
Paper transport unit 110, printing unit 200, head drive unit 23
0, print image storage unit 240, interface unit 2
50, a test pattern generation unit 300, an image reading unit 400, an inspection image storage unit 460, a monitor 470, an inspection unit 500, a control unit 600, an operation unit 610, and a heater 620.

FIG. 2 is a schematic external view of the printer device 100. The printer device 100 includes a main body 70 where the printing paper is actually conveyed, printing is performed, and the printing result is inspected.
0, a control unit 710 housed in a separate housing from the main body 700, and an operation unit 725 similarly housed in a separate housing. 2A is a side view of the main body 700, FIG. 2B is a top view of the main body 700, FIG. 2C is a diagram showing the control unit 710, and FIG. 2D is a diagram showing the operation unit 725.

The paper transport unit 110 is provided with a printing medium
This is a paper feed mechanism for sequentially transporting the printing paper. Paper transport unit 1
Numeral 10 denotes a cutter in order from the hopper, as shown in FIG.
Hopper unit 110 that sends out paper_-1, Print head 2
20_-1~ 220_-FourPrinting section paper transport that transports printing paper below
Feeding unit 110_-2, CCD camera 440_-1~ 440 _-Four
Inspection unit paper transport unit 110 that transports print paper below
_-3, A heater section paper transport unit that transports through the heater 620
G110_-FourFor accumulating ejected printing paper
A stacker unit (not shown) is integrally connected
This allows printing paper to be printed at high speed and
The sheet is conveyed in the main body 700 stably at a constant speed.

The paper transport unit 110 includes rollers and guides for feeding print paper, a sensor for detecting the position of the print paper, an encoder for detecting the paper transport speed based on the rotation speed of the rollers, and the like. Based on the control signal, conveyance / stop of printing paper, speed adjustment, and the like are performed. Also, as shown in FIG. 2B, a pulse from an encoder 111 provided on a paper feed roller near the head of the printing unit paper transport unit _110-2 is used as a signal for generating a timing at the time of printing. Is output to The paper transport unit 110 according to the present embodiment transports the print paper at about 3 m / s.

The printing section 200 receives an input from the control section 600.
Is stored in the print image storage unit 240 based on the control signal
The stored image data is printed on printing paper.
The printing unit 200 will be described in detail with reference to FIGS.
I will tell. FIG. 3 is a block diagram illustrating a configuration of the printing unit 200.
It is. FIG. 4A shows the head 220 of the printing unit 200._-1~
220_-FourFIG. 4B is a view showing the arrangement of
Camera 440 of the reading unit 400_-1~ 440_-FourArrangement
FIG. The printing unit 200 includes four printing units 200
_-1~ 200_-FourHaving. Each printing unit 200 _-i(I = 1 ~
In 4), a control signal is input from the control unit 600 and printing is performed.
Image data stored in image storage unit 240
Is read. In addition, the above-described paper transport unit 110
The signal from the encoder 111 is transmitted to all the printing units 200._-1~
200_-FourIs input in common.

Each printing unit 200_-i(I = 1 to 4) is printed
Control unit 210_-iAnd head 220 _-iHaving. Printing system
The control unit 210 includes a control signal input from the control unit 600,
And input from the encoder 111 of the paper transport unit 110
To the conveyed printing paper based on the signal
Operation timing of the head 220 and the head 220
The ink dropping speed described below is controlled. The head 220 is
Each has a dot density of 240 dpi and a print width Wh of 4 inches
Inkjet head, from the print control unit 210
Read from the print image storage unit 240 according to the control of
The recorded image data is sequentially recorded. In this embodiment,
There are four heads 220_-1~ 220_-FourBut FIG.
As shown in (A), the print dots of each head are continuous.
16 inches (4 inches)
Print on printing paper with a print width of Wp
Has become.

Further, a printing method of the head 220 will be described with reference to FIG. FIG. 5 is a diagram illustrating the structure and operation principle of the head 220. Head 220
In the above, 100,000 drops of the ink 224 in the ink bottle 221 are dropped from the nozzle 222 corresponding to each dot at a cycle of 100 kHz, that is, 100,000 drops per second. If the position of the printing paper 800 being conveyed below the nozzles 222 is a position to be printed in black for each of the inks 224, the ink 224 is directly dropped on the printing paper 800. , The position of the printing paper 800 is blackened. If the position is a blank position where printing should not be performed, an electric field is applied by an electric field applying means (not shown) to draw the ink 224 toward the catcher 223. As a result, the ink 224 is
3 and is not dropped on the printing paper 800.

According to such a method, the head 220
As shown in FIG. 6, dots having a dot pitch of about 0.1 mm and a dot size of about 0.1 mm in diameter are appropriately printed, and a desired image is printed. In the head 220, it is also possible to drop a plurality of inks 224 at the same position, and the printer device 100 expresses a pseudo gradation by this. In the present embodiment, a 240 dpi / 4 inch inkjet head manufactured by Scitex Digital Printing Co., Ltd. is used as the inkjet head.

The head driving unit 230 is provided with the printing unit 2 described above.
This is a means for performing fine adjustment of the position of the head 220 of No. 00.
In the present embodiment, four heads 220 _{-1 to} 220 -22
Since one printed material is printed using _0-4 , if these positions are shifted, the positions of the dots to be printed are also shifted, and printing cannot be performed properly. Therefore, the head driving unit 23
It is necessary to adjust the position of 0 with the same level of accuracy as the resolution of the printer device 100, and the head drive unit 230 performs the position adjustment.

[0023] Thus, the head driving unit 230 is composed of four heads 220 _-1 to 220 _-4 four head driving unit corresponding to 230 _-1 to 230 _-4. Each head driver 230 _-i (i = 1~4), the head 220 _-1 220
_It consists of a step motor that moves the position of _-4 , a limit switch that limits the moving range, and the like.
The heads 220 _{−1 to} 220 _{−1 to} 220 based on a control signal input from the control unit 600 within a predetermined moving range.
Adjust the position of _-4 .

The control unit 600 generates a position adjustment signal for each of the heads 220 _-i (i = 1 to 4) based on the result of inspection of a printing result in the inspection unit 500 described later. The adjustment of the head 220 is performed both in the main scanning direction (X direction in FIG. 4), which is the direction of the print head, and in the sub-scanning direction (Y direction in FIG. 4), which is equal to the transport direction of the printing paper. However, with respect to the adjustment in the Y direction, by adjusting the position of the head 220 and the adjustment of the print timing in the head 220, adjustment is performed so that finally appropriate printing can be performed.

The print image storage section 240 stores the print section 20
0 is a memory for storing image data to be printed on the printing paper 800. In the present embodiment, a dual port RAM is used. The print image storage unit 240 includes image data transferred from the host computer via the interface unit 250,
Alternatively, the image data generated by the test pattern generator 300 is stored in a bitmap format.

The interface section 250 is an interface for transferring image data transferred from a host computer (not shown) to the print image storage section 240, and is a dedicated serial interface in the present embodiment. The print image data is transferred at a high speed by the interface unit 250 according to the printing speed.

The test pattern generation unit 300 generates a test pattern for checking whether each unit of the printer apparatus 100 operates normally and can perform printing properly. In the present embodiment, the image data used for the check is stored in the ROM in the test pattern generation unit 300 in advance, and the image data is read out based on the control signal input from the control unit 600, and the bit map is read. The image is developed into an image and output to the print image storage unit 240. The control unit 600 causes the test pattern generation unit 300 to generate a test pattern before performing a series of printing operations, such as when the printer device 100 is started up, performs test printing, and changes the printing state of the printer device 100. To check.

In this embodiment, the test patterns include a first test pattern for adjusting the positions of the four heads 220 _{-1 to} 220 _-4 and a second test pattern for evaluating the state of the print head. And three test patterns of a third test pattern for evaluating the quality of printed characters. FIG. 7 shows a part of a first test pattern for adjusting the position of the head 220 _-i (i = 1 to 4). FIG. 7A shows a part of the test pattern.
(B) is an enlarged view of a region C of (A).

Two heads 22 as shown in FIG.
A pattern is printed such that there is a gap of one dot between 0- _i and 220- _i-1 (i = 1 to 3), and the gap d becomes a gap of one dot even on the printed image. By checking whether or not the two heads are shifted, it is possible to detect a shift in the position in the X direction (main scanning direction) between the two heads, and it is also possible to perform correction. Also, by checking whether or not the patterns printed in the X direction, such as the test patterns E1 and E2 in FIG. 7B, are printed on the same row, the two heads 220 _-i , 220- _{i-1 in} the Y direction (sub-scan direction) can be detected and corrected.

FIG. 8 shows a second test pattern for inspecting the state of the print head. The second test pattern shown in FIG. 8 includes three test patterns F, G, and H. The test pattern F is a pattern in which a straight line is drawn in the X direction for each dot in the Y direction, that is, a pattern in which all dots of each head are printed alternately in black or white. The test pattern G is a pattern in which black or white is alternately printed for each dot in the X direction and a straight line is drawn in the Y direction. The test pattern H is a pattern in which black or white of each dot of the test pattern G is inverted.

By using such a second test pattern, for example, the function of the head 220 can be inspected for each dot. For example, clogged nozzles, ink leaks,
Or, if there is interference with other dots, it can be detected immediately.

Although not shown, the third test pattern is a test pattern in which a number of various characters are arranged. Using this third test pattern, the print quality of significant characters and graphics is checked. Specifically, irregularities of characters, thinning of characters, thickening of characters, printing position differences, white spots, pinholes, character skew, dirt, density differences, and missing characters are checked.

The image reading section 400 reads the image printed on the printing paper by the printing section 200 to check the print content and the print quality, and as the bitmap image data, the inspection image storage section 460.
Output to FIG. 9 shows the image reading unit 400.
This will be described in detail with reference to FIGS. FIG. 9 is a block diagram illustrating a configuration of the image reading unit 400. The image reading unit 400 includes four image reading units 4
00 composed of _-1 to 400 _-4. A control signal is input from the control unit 600 to each image reading unit 400 _-i (i = 1 to 4). Each image reading unit 400- _i
After that, the read image data is output to the inspection image storage unit 460.

Each image reading unit 400 _-i (i = 1 to
4) The edge detection sensor 410 _-i and the encoder unit 42
0 _-i , a light irradiation section 430 _-i , a CCD camera 440 _-i, and a control section 450 _-i . The edge detection sensor 410
Each of the image reading units 400 is provided near the CCD camera 440 and detects an edge of the printing paper 800 conveyed after the printing by the printing unit 200 is completed. When an edge is detected, a signal to that effect is output to control section 450.

The encoder unit 420 is also provided near the CCD camera 440 of the image reading unit 400, and detects the transport speed of the printing paper 800 detected by the edge detection sensor 410. The configuration of the encoder unit 420 will be described with reference to FIG. Encoder part 4
20 includes an encoder 421, a counter 422, and a speed calculation unit 423. The encoder 421, for example, rotates integrally with the print paper transport roller of the paper transport unit 110, and outputs a predetermined pulse corresponding to the rotation angle. The pulses are counted by the counter 422, and the speed calculation unit 423 calculates the transport speed of the printing paper 800 based on the count value within a predetermined time.

The light irradiating section 430 is a means for giving an appropriate amount of light to an area on a printing sheet for capturing an image by a CCD camera 440 described later. In the present embodiment, light from a halogen lamp provided in the housing is guided by a fiber cable to irradiate the imaging range of the CCD camera 440. When capturing an image with the CCD camera 440, the required light amount increases as the transport speed of the printing paper 800 increases. That is, the printing paper 800
And the required light quantity are in a substantially proportional relationship. Therefore, the amount of light irradiated by the light irradiation unit 430 is
The control is performed based on the printing paper conveyance speed detected at 21.

The CCD camera 440 reads the printed image and outputs it to the inspection image storage unit 460.
The configuration of the CCD camera 440 will be described with reference to FIGS. FIG. 11 shows a CCD camera 4
FIG. 12 is a block diagram showing a configuration of the inspection image storage unit 40 and the inspection image storage unit 460. FIG. The CCD camera 440 includes a line sensor 441, an output amplifier 442, and an A / D converter 44.
3, a shift register 444, a line memory 445, and a bus switcher 446.

The line sensor 441 has a resolution of 16 dots / mm, 2048 elements in the horizontal direction, and 96 pixels in the vertical direction.
TDI-CC with TDI (time delay integration) number of stages
This is a D (charge coupled device) sensor. Therefore, the reading width Wc of one line sensor 441 is 128 mm. In the present embodiment, the four line sensors 441 _{-1 to} 441 _-4 are arranged with their reading ranges partially overlapping as shown in FIG.
As a whole, the entire range of the print width Wp of the head 220 can be read. A 15 MHz clock is applied to the TDI-CCD sensor 441. Therefore, one line scan time is about 17 μs.

FIG. 1 shows the TDI-CCD sensor 441.
This will be described with reference to FIG. In the TDI-CCD sensor 441, the optical image detected by the element (ROW1) in the first column forms an image on the front surface of the array, and the charge generated by the photons is stored during the accumulation time corresponding to one line scan.
Collected in a poteincial well. Then, the charges are vertically shifted to the next column (ROW2) by the clock in the vertical direction (TDI stage direction). In the next column, if the same image as before was formed, the charge generated in ROW2 would be added to the charge from the previous column, doubling the sensitivity or exposure time. Become.

Therefore, if the clock in the vertical direction and the TDI transfer direction are synchronized with the motion of the image, the TD
It will be integrated by the number of I stages. TD of the present embodiment
In the I-CCD sensor 441, the number of TDI stages is 96
As a step, the detected image is integrated by a factor of 96.
The integrated data is finally output serially from the horizontal shift register of the TDI-CCD sensor 441. The TDI-CCD sensor 441 is 2048
It has a horizontal resolution of bits, which are output from eight taps. Therefore, from one tap, 256
Bit data is output.

The data output from the respective taps of the TDI-CCD sensor 441, an output amplifier 442 _-1 ～442 _-8
Are sequentially amplified by A / D converters 443 _{-1 to} 443 _-8 .
It is D-converted and input to the shift registers 444 _{-1 to} 444 _-8 . Further, 256 bits of data are stored in the line memories 445 _{-1 to} 445 _-8 , and the eight line memories 445 _{-1 to} 445 _-8 are sequentially selected by the bus switcher 446, and a page is set for each line of data. Memory 46
It is input to the 0 _-1.

The control section 450 includes the image reading section 40
0 is a control means for controlling each unit. The control unit 450 controls the light amount of the light irradiation unit 430 based on a control signal from the control unit 600, information on edge detection by the edge detection sensor 410 described above, and information on a printing paper conveyance speed by the encoder unit 420. Control and CCD camera 4
An image reading control is performed at 40.

The inspection image storage section 460 is storage means for storing the image data read by the image reading section 400. In this embodiment, the page memory 460, as shown in FIG. 11, corresponding to the four CCD cameras 440 _-1 ～440 _-4 is configured from four of the page memory 460 _-1 ～460 _-4 You.

The monitor 470 has four CCD cameras 44.
A display device for directly displaying the image data read by 0 _{-1 to} 440 _-4 , and four CCD cameras 440
Four monitors 470 _{-1 to} 470 corresponding to _{-1 to} 440 _-4
-4 . This monitor 470 is, for example, as shown in FIG.
Is mounted on the control unit 710 as shown in the figure, and usually helps the operator visually grasp the rough situation,
It is used to check the print result when an error occurs.

The inspection section 500 includes a print image storage section 24
0 is compared with the inspection image read from the printed matter stored in the inspection image storage unit 460 to determine whether the printing state is appropriate, and the determination result is transmitted to the control unit 600. Output to In the present embodiment, the inspection unit 500 is realized by an arithmetic processing unit having a normal microprocessor. Hereinafter, the operation of the inspection unit 500 will be described with reference to the flowchart of FIG.

First, when the inspection is started (step S
0), read by four CCD cameras 440 _-1 ～440 _-4, each image data stored in the four page memory 460 _-1 ～460 _-4 mapped in one frame, The image data can be handled as one image data (step S1). Next, a reference pixel common to the read image data and the print image data recorded in the print image storage unit 240 is determined,
Pixel correspondence is made between both images (step S2). For example, by taking correspondence between the two image data with reference to the pixel on the upper side where the edge of the read image data is detected, or detecting the center of gravity of both black pixels,
Processing such as determining a corresponding pixel based on the point is performed.

Next, this inspection is performed by using a specific test pattern as shown in FIG.
If the inspection is to inspect a specific operation / function of 0 (step S3), the inspection image storage unit 460
Then, the test pattern is searched from the read image data stored in the printer, and the printing state of the pattern is checked (step S4). If the printing state is appropriate (step S5), it is output that the operation / function test was good (step S12).
The inspection ends (step S14). Step S
In 5, if the printing state is inappropriate,
The fact that there is a problem with the operation / function is output (step S13). The inspection ends (step S14).

In step S3, if this inspection is an inspection of a printing result during a normal printing operation, and is an inspection for performing overall matching of a printed image,
The setting of whether to perform matching with the compressed image or matching with the original image is checked (step S6).
If the mode is one in which matching is performed with the compressed image, compression is performed in step S7. This compression splits the image into, for example, 2 × 2 or 3 × 3 pixels,
When the total pixel value of each element is equal to or greater than a predetermined value, a process is performed to set the corresponding pixel to 1 and the original image is reduced to 1/4
Alternatively, it is compressed to 1/9. Next, matching is performed.
The matching is performed by sequentially comparing the read image data with the pixels of the original print image data (step S8),
The number of unmatched pixels is accumulated (step S9).
This matching is performed simultaneously for a plurality of pixels. For example, if the image data is binary data and the microprocessor is a 32-bit CPU, matching is performed on 32 pixels simultaneously.

When the accumulated number of mismatched pixels is larger than a predetermined threshold value THL (step S
10) It is determined that the image data read from the printed material is different from the original print image data, that is, there is a problem in the print content or print quality. Then, a signal indicating that the printing result is defective is output (step S1).
3), end the inspection (step S14). If the accumulated number of mismatched pixels does not exceed the threshold value THL (step S10), and matching is completed for all pixels in the matching target area (step S11), a signal indicating that the print result is normal is output (step S11). Step S12), the inspection is terminated (Step S14).

By the operation described above, the inspection section 500 makes the print image storage section 240 and the inspection image storage section 46
Compare the image data stored in 0. The inspection result is output to the control unit 600.

The control section 600 is a control section for controlling each section constituting the printer apparatus 100 to perform a desired operation. Printing conditions and control conditions are input to the control unit 600 from an upper-level host computer via an Ethernet I / F in the control unit 600. Control unit 600
Sets the operating conditions of the paper transport unit 110, the printing unit 200, the image reading unit 400, and a heater 620, which will be described later, based on the input data, and transports the print paper, prints the print paper, and Controls the reading of the printed image so that it can be properly performed synchronously.

The control unit 600 checks the operation of the printer 100 automatically or in accordance with an operator's instruction prior to a series of printing operations. In some cases,
Based on the inspection result, the head 220 of the printing unit 200
The head driving unit 230 is controlled so as to correct the position. Further, during the printing operation, when a signal indicating a printing failure is input from the inspection unit 500 during the printing operation, the control unit 600 controls the sheet conveying unit 11 so as to immediately stop the printing operation.
0 and the printing unit 200 are controlled.

An operation unit 610 is an operation terminal for performing relatively simple operations such as setting work conditions and print parameters on the printer device 100 and notifying an operator of data notified from the printer device 100. is there. In the present embodiment, a general-purpose personal computer is used by being connected by an RS232C interface. The operation unit 610 also outputs a log file of an inspection result of a printing state.

The heater 620 is provided at the last stage of the main body 700 of the printer device 100 and prints the printing paper 80.
It is a blower of warm air for drying the ink on the top.

Next, the operation of the printer 100 will be described. First, before performing a series of printing operations, the operation unit 6
Inspection of the printing state and print quality of the printer device 100 is performed in accordance with an operator's instruction from 10. Based on the operation of the operator, the control unit 600 sets the test pattern generation unit 30
0 is instructed to generate a test pattern. The test pattern generation unit 300 first generates a first test pattern including a test pattern as shown in FIG.
Output to 40. The printing unit 200 reads out the test pattern from the print image storage unit 240 and
Print on 0.

The test pattern printed on the printing paper 800 is read by the image reading unit 400 and stored in the inspection image storage unit 460. Then, the inspection unit 500
In, the pattern is checked, and whether or not printing is appropriate, that is, whether or not the position of the head 220 is correct is performed, and the inspection result is output to the control unit 600. If the inspection result is inappropriate, the control unit 600
The head driving unit 230 is configured to correct the position of the head 220 to an appropriate position based on data input from 0.
Control.

Subsequently, the controller 600 instructs the test pattern generator 300 to generate the second test pattern shown in FIG. As a result, the test pattern generation unit 300 generates a second test pattern mainly for inspecting the state of the print head, and outputs it to the print image storage unit 240. As in the case of the first test pattern, this test pattern is
0 is printed on the printing paper 800, and the printed image is read by the image reading unit 400 and stored in the inspection image storage unit 460. Inspection unit 50
In the case of 0, the image data stored in the inspection image storage unit 460 is subjected to template matching using the data stored in the print image storage unit 240 as reference data, and the number of mismatched pixels between the two images is checked.

If the number of unmatched pixels is larger than the predetermined threshold value THL, it is determined that the print quality is equal to or less than the reference, and a signal to that effect and data of the accompanying inspection result are output to the control unit 600. The control unit 600 outputs the result to the operation unit 610 to notify the operator that the state of the print head is not appropriate. If the number of unmatched pixels is equal to or less than the predetermined threshold value THL, the inspection unit 500 determines that the state of the print head is normal and outputs a signal to that effect to the control unit 600. Control unit 600 notifies the operator of the state via operation unit 610.

Further, according to the same inspection method, the print quality is inspected by using the third test pattern described above. This inspection result is also notified to the operator in the same manner as when the inspection is performed by the second test pattern.

The operator confirms that the printer device 100 operates normally based on the test result, and then proceeds to the actual printing operation. First, the operation unit 610 or
The print contents, print conditions, and the like are set via the host computer. Accordingly, the control unit 600 of the printer device 100 sets the operating conditions of the sheet transport unit 110, the printing unit 200, the image reading unit 400, the heater 620, and the like. When the setting of the conditions is completed and the actual printing operation is started, the bitmap image data to be sequentially printed is input to the printer device 100 via the interface unit 250, and the print image storage unit 2
The data is sequentially stored in the memory 40. Then, the print image storage unit 2
The printing unit 200 reads out the image data stored in 40 and prints it on the printing paper 800.

The image printed on the printing paper 800 is read by the image reading unit 400 and stored in the inspection image storage unit 460. Inspection image storage unit 46
The image data stored in “0” is sequentially output to the monitor 470. Then, the image data stored in the inspection image storage unit 460 is compared and collated in the inspection unit 500 with the original image data stored in the print image storage unit 240, and it is determined whether the two images match. . If there is a predetermined number of different pixels between the two images, the two images do not match, that is, it is determined that the printing state is not appropriate for some reason, and a signal to that effect is input to the control unit 600. . Then, based on the signal, control unit 600 instructs sheet conveyance unit 110 and printing unit 200 to stop the processing, and immediately stops the printing operation.

As described above, the printer 100 of the present embodiment can perform high-speed printing at a speed of about 3 m / sec while inspecting the print contents and the printing state. As a result, troubles such as duplication or omission of print contents can be almost completely avoided, and important documents can be printed with high reliability. In addition, when a printing failure occurs, the printing process can be stopped immediately, so that the defective printed matter can be minimized. In addition, not only the print head itself is defective,
Since the printed contents and the print quality can be inspected comprehensively, such as the transport state of the print paper and the stain caused by the poor gap adjustment between the print paper and the print head, printing can be performed with higher quality.

The first embodiment is not limited to the above-described embodiment, and various modifications are possible. For example, the print medium is not limited to cut paper as shown in the present embodiment, but may be continuous paper, or may be a print medium of a material other than paper. In that case, the paper transport unit 110 may have an arbitrary configuration according to the printing medium. In the case where continuous paper is used, a configuration may be adopted in which a cutting section for cutting continuous paper is provided at a stage subsequent to the heater 620 of the main body 700.

In this embodiment, the inspection unit 5
The inspection result of “00” was once input to the control unit 600, and based on a control signal from the control unit 600, for example, a process such as a stop of a printing operation was performed in the sheet conveying unit 110 or the printing unit 200. However, when processing is concentrated on the control unit 600, a time lag may occur if a signal is transmitted via the control unit 600, and the device may not be able to be stopped immediately. In such a case, the inspection section 500 sends the sheet to the sheet transport section 110 or the head 220.
A signal for directly stopping the processing when a printing failure is detected may be sent to a related component such as the above.

Also, in the present embodiment, in the inspection processing performed prior to the printing operation, the first to third three test patterns are used to determine the bonding state of the print head, the state of the print head, and The quality of printed characters is inspected. However, the test pattern is not limited to such a test pattern, and any test pattern may be used. Alternatively, a pattern may be printed on one test pattern so that all the above-described inspections can be performed, and the inspection may be performed by printing one test pattern.

Further, the inspection method of the inspection section 500 described using the flowchart shown in FIG. 13 is not limited to this procedure. In particular, in step S3, the processing is performed while distinguishing between the case where the inspection is mainly performed by matching and the case where the print state needs to be analyzed in detail. Depending on the method, it is also possible to carry out these tests in the same way. Such an inspection method may be used.

Further, the threshold value THL of the number of mismatched pixels may be made variable depending on the inspection object. For example, when testing a printer device using a test pattern, the threshold value TH
L is made smaller to make the inspection stricter, and during normal operation the threshold T
The inspection may be slightly relaxed by increasing the HL.
Further, the threshold value THL may be changed according to the printed matter.

Further, the present invention is not limited to a printer which prints in two black and white colors, such as the printer of the present embodiment, and performs multi-value printing, multi-color printing, or full-color printing. The present invention is also applicable to a printer device. Other signal processing, signal transmission paths, and the like may be arbitrarily and suitably modified within the scope of the present invention.

Second Embodiment A printer according to a second embodiment of the present invention will be described with reference to FIGS. The printer of the second embodiment is also a large-scale printing system that prints sequentially input print data at high speed using a plurality of inkjet heads, similarly to the printer 100 of the first embodiment. The method of printing print data at high speed and checking the result of the printing and the configuration therefor are the same as those of the printer apparatus 100. However, when a printing failure occurs, the printing process is immediately stopped in the printer device 100 of the first embodiment, but the printer device of the second embodiment prints the defective print. The printed matter is specified, and the printing and the processing for invalidating the printed matter are performed, and the printing processing itself is continuously performed.

First, the configuration of such a printer 100b according to the second embodiment will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 14 illustrates the printer device 100b.
15 is a schematic external view of main components of the printer 100b. As shown in FIG. 14, in the printer device 100b of the second embodiment, the point that a defective print marking unit 630 is newly provided, and the paper transport unit 110
b, the details of the operation of the control unit 600b are different from those of the printer device 100 of the first embodiment. Other basic configurations are
This is the same as the printer device 100 of the first embodiment.
The same components are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 15, the defective printing marking section 630 includes the unit of the CCD camera 440 and the heater 6.
20 is provided between the printer 20 and the print unit 200 prints a desired image and the print result is checked by the check unit 500. If it is determined that the print is a defective print, the print contents are printed on the print. Print a mark that invalidates it. As shown in FIG. 15, the defective print marking section 630 includes the first print head, ie, the filling print head 6.
A print control unit (not shown), a defective print mark print head 632 serving as a second print head, and a print control unit (not shown);
The print controller controls each head based on a signal input from 0b to print a desired image at a desired position.

The filling print head 631 is a head for printing a predetermined fill pattern in a predetermined area of a printed material, and thereby, the content already printed in that area is painted out to make it indistinguishable. , At first glance it turns out to be defective, so that the print can no longer be used as the original print. Specifically, for example, when the print target is an invoice with an address, the address portion is painted out so that the defective printed invoice is not actually sent, and the print target is various securities or In the case of a cash voucher or the like, for example, the money portion or the number portion of the voucher is painted out so as to be apparently unusable. The defective print mark print head 632 prints a predetermined mark on a predetermined area of the defective printed material by passing the inspection device, and when a printing operator or the like sees the printed material as a defective printed material. I do. In the present embodiment,
An error code consisting of alphanumeric characters indicating the type of the detected defect is printed in a blank area at the lower right of the printed matter.

The print head 631 for filling and the print head 632 for a defective print mark have the same configuration and printing system as the head 220 of the printing unit 200, and have a printing width of 1 unit.
Inch inkjet head. Further, these heads can be moved to an arbitrary position in the main scanning direction (a direction perpendicular to the sheet feeding direction). Therefore, based on the paper to be printed and the print format, by moving these heads in advance to the area where the fill pattern or the defective print mark is to be printed, it is possible to print those patterns at an arbitrary position on the print paper. it can. In addition,
The exact printing position in the printing area of each head is controlled by the printing control unit in the defective printing marking unit 630. Further, the print control unit includes a sheet transport unit 11 described later.
Based on the marking unit output of the encoder (not shown) are provided on the sheet conveying unit 110 _-5 = 0b detects the position of the printed matter, to determine the exact printing position in the sub-scanning direction (paper feeding direction).

[0074] The paper transport unit 110b, the marking portion paper transport unit 110 _-5 for conveying the printing paper through the printing failure marking unit 630 are newly provided, the hopper unit 110 _-1, the printing unit sheet conveying unit 11
0 _-2 , the inspection unit paper transport unit 110 _-3 , the marking unit paper transport unit 110 _-5 , the heater unit paper transport unit 110 _-4 , and the stacker unit are integrally connected. Conveys stably at a predetermined speed.

The control section 600b controls each section constituting the printer apparatus 100b to perform a desired operation similarly to the control section 600 of the first embodiment. In particular, during a printing operation, when a signal indicating a printing failure is input from the inspection unit 500, each printing is performed so that the defective printing marking unit 630 performs printing that invalidates the printed matter. Output image data and print position information.

Next, the operation of the printer 100b will be described with reference to FIG. FIG. 16 is a diagram illustrating a printed matter processed by the printer device 100b. FIG.
In the printed matter shown in FIG. 6, the contents to be printed on the printing paper 800 by the printer device 100b are, for example, bills such as telephone charges, and the billing address 801 and billing information 802 laid out as shown in the drawing. , And the description 803 of the claim content. Hereinafter, the operation of the printer 100b in the case where such a bill is to be printed by the printer 100b will be described.

First, before the actual print processing, an inspection such as a print state and print quality is performed using the test pattern generated by the test pattern generation unit 300. As a result of the inspection, when it is confirmed that the printer device 100b operates normally, print contents, print conditions, and the like are input via the operation unit 610 and a higher-level host computer, and based on the input information, the printer device 100b Each part is initialized. At this time, for example, the type of the fill pattern, the fill area, the type of the defective print mark, the print position of the defective print mark, and the like performed by the defective print marking unit 630 are also set.

When the initial setting is completed, bitmap image data to be sequentially printed is input via the interface unit 250, stored in the print image storage unit 240, and then printed on the printing paper 800 by the printing unit 200. The image printed on the printing paper 800 is read by the image reading unit 400 and stored in the inspection image storage unit 460, and the inspection unit 500 compares the original image data stored in the print image storage unit 240 with the original image data. It is determined whether the two images match. If the two images match, it is determined that printing has been properly performed, and the printed matter is sequentially stored in a stacker (not shown).

Assuming that a black line 810 as shown in FIG. 16 is generated in the image printed by the printing unit 200 during the sequential execution of such printing processing, the image reading unit 400 reads out the inspection image. The image stored in the storage unit 460 and the print image storage unit 2
Due to this black line 810, the original image data stored in 40 does not match. As a result, the inspection unit 500 detects that the printing state is defective. The control unit 600b, to which the signal indicating that the printing state is defective from the inspection unit 500, is immediately input to the defective printing marking unit 630 to fill a predetermined area of the bill and an error indicating the detected defective state. Outputs a signal that causes code printing.

As a result, the filling print head 631
Paints the area 821 black so that the contents below it become invisible. The defective print mark print head 632 of the defective print marking unit 630 records the error code 822 in the lower right area of the printing paper. It should be noted that the bill on which these patterns and the error code are printed is sequentially stored in the stacker in the same manner as a normally printed bill.

As described above, in the printer device 100b of the second embodiment, when a print failure occurs, the defective print is clearly recognized as a defective print and cannot be used as the original print. It is in a state. Therefore, if only a normally printed product is selected and used for its intended purpose, even if a defective printed product is scattered in a normal printed product due to an error of an inspection device or an operator, the printer device 100b In the case of the printed matter, the defective printed matter is painted out so that it can no longer be used for its intended purpose, so that accidents such as incorrectly sending a bill can be almost completely prevented.

Further, even if a defective printed matter occurs, the printing operation can be continued after distinguishing it from a normal printed matter. Therefore, loss due to stopping the printer device 100b can be reduced, and printing can be performed efficiently.

The present embodiment is not limited to the example described above, and various modifications are possible. For example, the defective print marking section 630 includes the filling print head 6.
It is not necessary to include both the print head 31 and the defective print mark print head 632, and a configuration having only one of them may be used. In addition, a mark indicating a print failure printed by the defective print mark print head 632 is not limited to the error code as shown in FIG. For example, an arbitrary figure as shown in FIG. 17A may indicate that the printed matter is a defective printed matter, or the printed matter has no effect as shown in FIG. 17B. For a description that clearly indicates that the description is valid, the description may be marked as valid or not. In addition, a barcode or the like may be used.

Further, the printing head 631 for filling and the printing head 632 for the defective printing mark of the defective printing marking section 630 are not limited to ink jet type heads, but may be any type of head.

[0085]

FIG. 18 shows a specific example of the control unit 710 of the printer 100 according to the first and second embodiments of the present invention. FIG. 18 is a block diagram illustrating a configuration of the control unit 710 according to the present embodiment. FIG.
A control unit 710 is an arithmetic processing unit mainly including a main processor unit 713, and is provided on a master bus 719 with a main processor unit 713, a bus controller 714, and a frame memory controller 71.
5, printing section data I / F 716, inkjet head driving section I / F 717, RS232 CI / F 718, interface section 723, and frame memory 240 are connected. In the following description of the present embodiment,
Components that are not illustrated in FIG. 18 and components that have exactly the same functions as the components described in the above-described embodiment will be described using the same reference numerals as those used in the first embodiment. I do. Further, the correspondence with the above-described embodiment will be described with reference to the first embodiment.

The main processor unit 713 is the same as that shown in FIG.
Is a processor unit that actually performs the processing of the control unit 600 in the embodiment of the present invention shown in FIG. The bus controller 714 is a controller that controls the transfer of data on the master bus 719, and controls the data transfer of each unit in the embodiment of the present invention illustrated in FIG. The frame memory is the print image storage unit 240 in the embodiment of the present invention shown in FIG. The frame memory controller 715 is a controller that controls reading / writing of data from / to the print image storage unit 240.

The print section data I / F 716 is an interface for transferring print image data, and the frame memory 240 via the print section data I / F 716.
And the transfer of the print image from the print image storage unit 240 is performed. The print unit data I / F 716 is
It has two ports. The first port transfers a print image from the host computer, and the second port transfers a print image to the printing unit 200. The inkjet head driving unit I / F 717 is an interface with the head driving unit 230. RS23
The 2CI / F 718 is an interface with the operation unit 610, and performs operations from a worker, reports inspection results to the worker, and the like via the RS232 CI / F 718. The interface unit 723 is an Ethernet interface that transfers data such as control signals to the host computer via Ethernet.

[0088] In the control unit 710 of the present embodiment, the image reading unit 400 shown in FIG. 1, the inspection image storage unit 460, a monitor 470, and, the function of the inspection unit 500, four CCD cameras 440 _{- 1 to} 440
_-4 are implemented in the form of four inspection units 720 _{-1 to} 720 _-4 . Each inspection unit 720 _-i (i = 1
4) are RISC-MPU board 712, video RA
M board 721 and CRT control board 722
Having. The RISC-MPU board 712 includes an encoder 421, an edge detection sensor 410, and a light irradiation unit 4
30 are connected, and each RISC-MPU board 7
12.

The video RAM board 721 is connected to a CCD camera 440, and the bitmap image data read by the CCD camera 440 is stored in the video RAM board 721.
It is stored in the AM board 721. The CRT control board 722 controls a monitor 470 that outputs the read video data as it is. Each board of these inspection units 720 _{-1 to} 720 _-4 is connected via a video bus 711.

In the inspection unit 720 of the present embodiment, the printing unit data I / F is sent from the host computer.
The print image data transferred via 716 is stored in the frame memory 240. Frame memory 240
Is output to the printing unit 200 again via the printing unit data I / F 716, and is printed on the printing paper 800 by the printing unit 200. Printing paper 80
The image data printed in the inspection unit 720
read by the CCD cameras 440 _-i of _-i (i = _1~n), respectively are recorded in the video RAM board 721 _-i. The image data recorded in the video RAM board 721 _-i is transferred to the CRT control board 722 _-i via a video bus 711, each monitor 470
Displayed for _-i .

At this time, that is, each CCD camera 4
The data read by 40- _i is the video RAM board 72
When recorded in 1, the inspection units 720 _{-1 to} 720 _-4
RISC-MPU board 712 _-i (i = 1
4) Alternatively, the main processor unit 713 performs frame mapping and positioning. When the positioning is completed, each RI of the inspection units 720 _{-1 to} 720 _-4
In SC-MPU board 712 _-1 ～712 _-4 video RAM board 7 of each inspection units 720 _-1 to 720 _-4
The image data stored in 21 _{-1 to} 721 _-4 is
Each of them is independently compared with the corresponding image data in the frame memory 240. And four inspection units 7
The results of the comparison and collation in 20 _{-1 to} 720 _-4 are compiled again by one of the inspection units 720 _-i (i = 1 to n) of the inspection units 720 _{-1 to} 720 _-4 or the main processor unit 713. , The final inspection result is obtained.

The test pattern is generated by the main processor unit 713 expanding a test pattern stored in a storage unit (not shown) and
Generated by outputting to 0.

The control unit 710 is configured as in this embodiment.
By doing so, the present invention can be implemented. So
In particular, in the control unit 710 of this embodiment,
CCD camera 440 _-1~ 440_-Four4 inspections corresponding to
In the unit 720, the matching process is performed independently for each.
The inspection of the printing condition of the present invention can be performed at high speed
You.

[0094]

According to the printer apparatus of the present invention, it is possible to inspect the print result of each printed matter in detail, and to eliminate defective printed matter almost completely, thereby achieving accurate and high-quality printing at high speed. It is possible to provide a highly reliable printer device which can be performed easily.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a printer device according to a first embodiment of the present invention.

2A and 2B are schematic external views of the printer device shown in FIG. 1, wherein FIG. 2A is a side view of the main body, FIG.
(C) is an external view of the control unit, and (D) is an external view of the operation unit.

FIG. 3 is a block diagram showing a configuration of a printing unit of the printer device shown in FIG.

FIGS. 4A and 4B are diagrams showing the arrangement of a print head and a CCD camera of the printer shown in FIG. 1; FIG. 4A is a diagram showing the arrangement of four print heads;
It is a figure showing the arrangement state of D camera.

5 is a diagram illustrating the structure and operation principle of a print head of the printer device shown in FIG.

FIG. 6 is a diagram showing a printing state by the print head shown in FIG. 5;

7A and 7B are diagrams illustrating a first test pattern generated by a test pattern generation unit of the printer device illustrated in FIG. 1; FIG. 7A is a diagram illustrating a part of the test pattern;
FIG. 4 is an enlarged view of a region C of FIG.

8 is a diagram illustrating a second test pattern generated by a test pattern generation unit of the printer shown in FIG.

9 is a diagram illustrating a configuration of an image reading unit of the printer device illustrated in FIG.

FIG. 10 is a diagram illustrating a configuration of an encoder unit of the image reading unit illustrated in FIG. 9;

11 is a diagram showing a configuration of a CCD camera of the image reading unit shown in FIG.

12 is a diagram illustrating the configuration and operation of a TDI-CCD sensor used as a line sensor of the CCD camera shown in FIG.

FIG. 13 is a flowchart illustrating an inspection operation performed by an inspection unit of the printer illustrated in FIG. 1;

FIG. 14 is a block diagram illustrating a configuration of a printer device according to a second embodiment of the present invention.

15A and 15B are external views of the printer apparatus main body shown in FIG. 14, wherein FIG. 15A is a side view and FIG. 15B is a top view.

FIG. 16 is a diagram showing a printed matter processed by the printer device shown in FIG. 14;

FIG. 17 is a diagram showing a modified example of an error code printed in the defective print marking section shown in FIG. 14,
FIG. 7A is a diagram illustrating a case where a defective printed matter is displayed by a graphic, and FIG. 7B is a diagram illustrating a case where a bad printed matter is displayed by enabling annotations.

18 is a diagram showing a specific configuration example of a control unit of the printer shown in FIG. 2 as an embodiment of the present invention.

[Explanation of symbols]

100: Printer device, 110: Paper transport unit, 111:
Encoder, 200 printing section, 210 printing control section, 2
20: head, 221: ink bottle, 222: nozzle, 223: catcher, 224: ink, 230: head drive unit, 240: print image storage unit (frame memory), 250: interface unit, 300: test pattern generation unit 400 ... image reading unit, 410 ...
Edge detection sensor, 420 ... encoder unit, 421 ... encoder, 422 ... counter, 423 ... speed calculation unit, 4
30, a light irradiation unit, 440, a CCD camera, 441, a line sensor (TDI-CCD sensor), 442, an output amplifier, 443, an A / D converter, 444, a shift register,
445: Line memory, 446: Bus switcher, 45
0: control unit, 460: inspection image storage unit (page memory), 470: monitor, 500: inspection unit, 600: control unit, 610: operation unit, 620: heater, 630: defective printing marking unit, 631: for filling Print head, 63
2 ... defective print mark print head, 700 ... body, 710
... Control unit, 711 ... Video bus, 712 ... RIS
C-MPU board, 713: main processor unit, 714: bus controller, 715: frame memory controller, 716: printing unit data I / F, 717
... Inkjet head drive unit I / F, 718 ... RS2
32 CI / F, 719: Master bus, 720: Test unit, 721: Video RAM board, 722: CRT
Control board, 723 ... Interface part, 7
25: operation unit, 800: printing paper

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tsutomu Yoneda 1-2-4-102 Hakusan, Aso-ku, Kawasaki City, Kanagawa Prefecture (56) References JP-A-5-318888 (JP, A) 558 (JP, A) JP-A-6-247618 (JP, A) JP-A-7-81191 (JP, A) JP-A-4-221996 (JP, A) JP-A-6-227098 (JP, A) JP-A-4-43468 (JP, A) JP-A-5-76005 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H41J 2/01 H41J 29/46 H04N 1/40 G06F 3/12

Claims (5)

(57) [Claims] 1. A printer device for sequentially printing different data for each print medium at high speed, wherein bitmap data of a sequentially input print image is stored.
It has a print image memory that stores each fixed page and a predetermined print area that includes areas that do not overlap each other.
Having a plurality of heads,
A first printing unit that prints a print image stored in a print image memory on a printing medium, and a predetermined reading area that includes areas that do not overlap each other
And a plurality of sensors having
Ri, and an image sensor means for reading an image on recording medium with the printed, bit the read read image for each predetermined page
Read image memory for storing in a map image format, and stored in the print image memory as required.
Bitmap data of the print image and the read image
Bitmap data of the read image stored in
Data and compress the bitmap of each compressed image.
Image compression means for generating pre-data, and a print image stored in the print image memory.
Bitmap data or the bitmap data
The compressed bitmap data is selectively used as reference data.
The read image stored in the read image memory.
Page bitmap data or the bitmap data
Bitmap data and template match
And detecting those differences, based on the amount of the differences
The state of the printing is determined whether appropriate or inappropriate, and inspection means for inspecting the state of printing by the first <br/> printing means, the result of the examination, the print state is determined to be inappropriate Was
In the case, the specified item printed on the print medium
A predetermined image that substantially invalidates the print item
And a second printing means for superimposing the printing . 2. The printing device according to claim 1, wherein the second printing unit prints the print medium.
At a predetermined position, inform that the printing of the print target medium is invalid.
The printer device according to claim 1, further comprising printing a predetermined mark to be indicated . 3. The method according to claim 1, wherein the first printing unit determines a result of the inspection.
If the printing state is determined to be inappropriate,
3. The printer device according to claim 1, wherein printing is stopped . 4. The printing means includes an ink jet head.
Printing on the printing medium by an ink jet method
The printer device according to claim 1, wherein the printer device performs: 5. The image sensor means is a time delay integration type.
(TDI) CCD sensor with high speed
The image on the printed medium on which the printing has been carried
The printer device according to claim 1, wherein the printer device reads the data.