JP2931109B2 - Printed matter monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed matter monitoring apparatus for monitoring printing defects such as an offset rotary printing press.

[0002]

2. Description of the Related Art A conventional defect display of this kind of printed matter has a structure as shown in FIG. That is,
A monitoring sensor 100 monitors a defect such as a stain generated on the print web 101. Contamination of the print web 101 is generated by ink splash, accidental water dripping, oil dripping, and the like, and it is necessary to constantly monitor the printing web 101 during printing. The detection sensor 100 extends in a direction orthogonal to the moving direction of the print web 101, and
Are sequentially scanned in a line to monitor the print web 101 for stains.

[0003] When a defect is discriminated, a generated portion and its cause are displayed on a display screen of a CRT or the like, a marking circuit is operated in accordance with the content of the defect, and the printed web 1 is printed.
For example, a mark is applied by spraying to a corresponding portion on the device No. 01 (for example, see Japanese Patent Application Laid-Open No. 60-155465).

[0004]

However, in the case of the above-mentioned prior art, there are the following problems for displaying a defect position or marking a printed material.

First, since the defect position is displayed, it is difficult to distinguish between a single event and a continuous event.

Second, in the marking of printed matter, a defect sample must be taken every time a defect occurs.

[0007] Therefore, it is very difficult to find the cause, and as a result, the discovery of the printing obstruction factor is delayed, resulting in disadvantage.

[0008] The present invention has been made to solve the above-mentioned problems of the prior art.
It is an object of the present invention to provide a printed matter monitoring device capable of storing a history of printing defects and performing a maintenance operation of a printing press quickly.

[0009]

In order to achieve the above-mentioned object, according to the present invention, there is provided a defect position judging means for judging a defect position on a print web sent from a printing section, and the defect position judging means. Defect history storage means for storing the obtained defect position information together with history information such as the defect occurrence time, the number of consecutive occurrences, the winding name, and the number of used sheets, and a history display for displaying the defect history stored by the defect history storage means Means,
It is characterized by comprising.

[0010]

When a defect occurs, the defect position is determined by the defect position determining means, and the defect position information is stored in the defect history storage means together with history information such as the time of occurrence, the number of consecutive occurrences, the winding name, and the number of used sheets. It is stored and displayed on the history display means. By looking at the history of this defect, the operator can determine whether the defect is a single defect, a continuous defect, is concentrated on a specific take-up sheet, or occurs at a fixed time interval. , The information as to whether or not it occurs at intervals of the number of sheets can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows a schematic configuration of a printed matter monitoring apparatus according to an embodiment of the present invention, and a defect position determining means 3 for determining a defect position on a print web 2 sent from a printing unit 1.
A defect storage means 5 for storing the defect position information E obtained by the defect position determination means 3 together with history information such as the defect occurrence time, the number of consecutive occurrences, the winding name, the number of used sheets, and the storage information is displayed. And a printer 30 as a display unit.

As shown in FIGS. 3 and 4, the defect position determining means 3 divides the print web 2 into a large number of pixels, and photoelectrically converts each pixel information into an electric signal to form an electric signal.
A reference data memory M0 for storing reference data Bi prepared in advance for each printed matter, an inspection data memory M1 for storing actual inspection data Ai, and a reference data memory M0, M1 Reference data B stored in
i and the inspection data Ai, an allowable data memory M2 for storing allowable data α, and a subtractor 7
The comparator 8 compares the inspection output data Ai-Bi output from the printer with the permissible data α, and the position information conversion means 9 converts the defect information determined by the comparator 8 into position information on the print web 2. Be composed.

A changeover switch 10 is provided between the monitoring sensor 6 and the reference data memory M0 and the inspection data memory M1, and the detection data obtained by the monitoring sensor 6 by the changeover switch 10 is transmitted to the reference data memory M0 and the inspection data memory M1. M1 is selectively transmitted. In this embodiment, at the start of printing, when trial printing is performed and it is determined that there is no defective sheet, the changeover switch 10 is switched to the terminal a, and this normal printing information is used as the reference data Bi.
Is stored in the reference data memory M0.

Then, in order to use the measured data as data to be inspected after the reference data Bi has been created, the changeover switch 10 is switched to the terminal b to store the measured data in the inspection data memory Mi. The synchronizing signal generated when the inspection data Ai of one printing surface on the print web 2 is prepared in the inspection data memory M1,
The subtractor 7 subtracts the inspection data Ai from the reference data Bi for each pixel, and outputs the inspection output data (Ai-Bi).
Is output as

The test output data (Ai-Bi) is compared with the permissible data α for each pixel in the comparator 8, and the pixel I satisfying the test output data (Ai−Bi)> permissible data α is obtained.
i is determined to be a defective pixel and is used as a determination output Fi.

Here, the monitoring sensor 6 is a line sensor extending in a direction perpendicular to the flow direction of the printing web 2, and scans the printing surface for each line-shaped detection area of a predetermined width to sequentially monitor dirt. Things. Pixel I serving as a detection unit
As shown in FIG. 1, i is one area obtained by dividing the linear detection area of the printing surface into a number of detection areas, and a number of light receiving elements such as CCDs are arranged corresponding to each pixel Ii.
Assuming that the flow direction of the printing web 2 is the y axis and the direction orthogonal to the y axis is the χ axis, one printing surface P formed by the plate cylinder
The position of a certain pixel Ii above is specified by a matrix of xy coordinates.

Then, based on the determination output Fi, the position information conversion means 9 converts the defect output information into defect position information E (χe, ye) on the print web 2.

As shown in FIG. 2, the defect storage means 5 comprises a defect information register 51, a file management section 52, and a defect file 53. The defect information register 51 is shown in FIG. As described above, the defect position area 511
, A time area 512, a winding number area 513, a winding name area 514, and a continuous number area 515.

The defect position information E from the defect position judging means 3 is written in the defect position area 511, and the time information C1 from the calendar timer 516 is written in the time area 512. On the other hand, in the take-up number area 513, the take-up number information C2 from the print number counter 517 obtained from the print number count pulse CP is written.
At 14, the winding name update information C 3 is read in every winding conversion. Further, in the continuous number area 515, continuous number information C4 in which defects continue is read.

The time information C1, the number of used winding information C2, and the updated winding name information C3, which are history information, are timed by the register write signal P1 from the first one-shot pulse generation circuit 519, and the defect information register 5
Written to 1. On the other hand, the continuous number information C4 is controlled to be written in the continuous number area 515 by an output value of the flip-flop 518 and an output value of the AND circuit 521 which receives a third timing signal T3 described later as an input signal. The content of the defect information register 51 is the defect file write signal P from the second one-shot pulse generation circuit 520.
2 to the defect file 53.

First and second one-shot pulse generating circuit 5
Reference numerals 19 and 520 are selectively switched by the output signal of the flip-flop 518.

Next, the process will be described with reference to the timing chart shown in FIG.

The timing of each process is based on a signal from the plate cylinder rotation sensor 40 as shown in FIG. 5 and is sequentially synchronized with first, second, third and fourth timing signals T1, T2, T3 by a synchronization signal. , T4. The rise of the signal from the plate cylinder rotation sensor 40 is synchronized with the start position of the plate cylinder gap. The measured inspection data Ai is sampled from the rise of the first timing signal T1 to the next rise, that is, in a section corresponding to one printing surface P.

The reference data Bi and the inspection data Ai are subtracted and compared for each pixel on one printing surface P in synchronism with T1 for each of these sections, and as a result of the subtraction comparison, the judgment output Fi is obtained as described above. . That is, when the difference between the inspection data Ai and the reference data Bi is larger than the allowable data α (Ai−Bi> α), it is determined that there is a defect, and the position of the defective pixel Fi in the picture is determined as defect position information E. It is converted into matrix information. This calculation is performed until the next second timing signal T2 is output. In the illustrated timing chart, as an example, the interval between the first timing signal T1 and the second timing signal T2 is one pulse of the clock pulse CP, but the time required for the operation is appropriately selected.

The display method of the defect position information E is a matrix display (xe, ye) as described above. Here, the inspection pixel unit is 5 mm in the x-axis direction, which is the width direction of the print web 2, and 1 in the y-axis direction, which is the flow direction of the print web 2.
In the case of 5 × 1 pixel with mm, the actual defect occurrence position is (5 × χe, ye). However, the actual defect position may be displayed at the time of display. In that case, as shown in FIG.
And the length Δy may be stored in a memory, and multiplied by the number of pixels i up to the defect position and the number of scanning lines.

The defect position information E obtained as described above
Is stored together with the time information C1 in synchronization with the second timing signal T2.

Next, the third timing signal T3 is input. At this time, since the flip-flop 518 has not been set yet, the output of the AND circuit 521 is L, and the continuous number information C4 is not counted. The initial value data remains at 0. When the fourth timing signal T4 is input, the flip-flop 518 is set and rises, and the one-shot pulse generation circuit 519 generates the register write signal P1. The winding number information C2 and winding name information C3 are written into the defect information register 51 in synchronization with the register write signal P1. In the defect position area 511, all defect position information E of the defective pixel is recorded for one printing surface.

Next, a process of determining the defect position information Fi is performed on the measurement data of the second printing surface.

If it is determined that the second printing surface has a defect, the output of the AND circuit 521 becomes H in synchronization with the third timing signal T3, and the defect position information E of the second surface is stored in the defect information register 51. Is written to the defect position area 511, and the logical sum operation is performed with the defect position information E of the first surface already written. Thereby, the defect position area 511
Inside, the defect position information E detected on the entire first and second surfaces is recorded as data without omission.

Further, in accordance with the output of the AND circuit 521, the present value of the continuous number area 515 is incremented by 1 in parallel with the calculation of the defect position information E, thereby updating the continuous number value. At the information writing stage on the first side, the continuous number is 0 because the value is 0.

On the other hand, when it is determined that there is no defect on the second printing surface, there is no defect position information E at the timing of the third timing signal T3. Even if the logical sum operation is performed, the information in the defect position area 511 does not change, and only the current value of the continuous number area is incremented by +1 to update the continuous number value. Since it is 0 at the time of the first surface, it is updated to 1 by one. here,
If there is a defect continuously on the first and second surfaces and there is a defect on the third surface, it is updated to 2 on the second and third surfaces, respectively.

Then, when the fourth timing signal T4 is inputted, the flip-flop 518 is inverted and the output falls, so that the second one-shot pulse generation circuit 520 generates a defective file write signal P2, and the defective file write signal P2 is generated. Defect information register 51 triggered by signal P2
Of the defective file 5 via the file management unit 52
3 is written.

As a matter of course, the head write address and the like are separately managed for writing to the defect file 53, and the data in the defect information register 51 is defined as one record in which the period from the occurrence of the defect to the normal state is one record. As shown in FIG. 6, the data is stored in chronological order.

The printer management section 54 constantly monitors the printer operation status based on the printer status, and issues a data request to the file management section 52 when print output becomes possible. The file management unit 52 manages up to which record of the defect file 53 the printout has been performed in addition to the management of the defect file 53.

If there is a record that has not been output in response to a data request from the printer management unit 52, print output data is sent to the printer management unit 52.

The printer management unit 52 sends the received print output data to the printer 30, and the printer 30 performs output processing.

The history of the defects thus obtained is sequentially output to the printer 30, and based on the record, the operator can determine the type of the defect.

An example of a method for determining the type of a defect will be described below in an individual paragraph. (1) One sheet defect (when the continuous sheet number data is "1") Skimming of paper Ink splash on paper: between final printing section and dryer Water splash on paper: between last printing section and dryer On paper Tar dripping: tar accumulation in the dryer furnace (2) Continuous defects Ink splashes on the rollers, plates, and paper ... Water splashes from the first printing section to the rollers, plates, and paper in the final printing section, water dripping ... First
Density fluctuation from printing unit to final printing unit Incorrect registration (3) Cause of time (periodic) Ink / sag… Excessive ink sticking around machine Water sag… Condensation around machine (4) Rewind name 1 (5) Number of used windings (periodicity) in connection with (2) Density fluctuation in connection with (2) In this way, the operator can easily infer the cause of the defect from the record of the defect. Can be.

[0039]

The present invention has the above configuration and operation. Since the history at the time of occurrence of a defect is displayed by the defect history storage means and the history display means such as a printer, the operator can check the periodicity of the defect and the like. It is possible to confirm, and it is possible to easily specify the production obstruction factor including the printing press and the paper, and the maintenance workability is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a printed matter monitoring apparatus according to one embodiment of the present invention.

FIG. 2 is a control block diagram that embodies the configuration of FIG.

FIG. 3 is a control block diagram showing a signal processing system for a defect information register in FIG. 2;

FIG. 4 is a block diagram illustrating a detailed configuration of a defect position determining unit in FIG. 1;

FIG. 5 is a timing chart of a control process.

FIG. 6 is an explanatory diagram showing a file configuration of a defect in the printed matter of FIG. 2;

FIG. 7 is a perspective view showing a schematic configuration of a conventional printed matter monitoring apparatus.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 printing section 2 printing web 3 defect position determining means 4 defect history storage means 5 history display means

Continued on the front page (72) Inventor Masahiro Nakazato 4-5676 Hibarigaoka, Zama-shi, Kanagawa Prefecture Toshiba Machine Co., Ltd. Sagami Plant (58) Field surveyed (Int. Cl. ⁶ , DB name) B41F 33/14 B41F 33/02 G01N 21/84

Claims (1)

(57) [Claims] 1. A defect position discriminating means for discriminating a defect position on a print web sent from a printing unit, and defect position information obtained by the defect position discriminating means are used to determine a defect occurrence time, a continuously generated number, a winding name, A printed matter monitoring apparatus comprising: a defect history storage unit that stores together with a history such as the number of used sheets; and a history display unit that displays the defect history stored by the defect history storage unit.