JPH03102051A - Display method for article of inferior quality of printed matter and device thereof - Google Patents

Abstract

PURPOSE:To accurately find out the position piled with waste sheets after completion of printing by inserting a first display tape at changing from a good article to an article of inferior quality in the printed matter piling in order, and inserting a second display tape at changing from the article of inferior quality to the good one. CONSTITUTION:At least two set of tape inserters 23, 24 are provided, at changing from an article of good quality to an article of inferior quality in printed matter piled in order, a first tape inserter 23 is operated with a controller 21, and at changing from an article of inferior quality to an article of good quality, a second tape inserter 24 is operated. In this way, the piled printed matter 15 from the position inserted with the first display tape 25 to the position inserted with the second display tape 26 is displayed as the article of inferior quality.

Description

Detailed Description of the Invention Industrial Field of Application The present invention provides a defective product display method and device for displaying the position of a defective product among printed matter printed by a sheet-fed printing machine and stacked. Regarding.

(Prior art) In printing, there is a possibility that paper with poor printing (hereinafter referred to as waste paper) may be generated, and when the paper is printed on a sheet-fed printing machine and piled up, the location of this waste paper becomes unknown. Put it away.

Conventionally, the quality of printed matter is inspected immediately after printing, and waste paper determined to be defective is marked with some kind of mark so that the position in which it is stacked can be identified.

Methods of attaching this mark include directly marking the waste paper with a label, etc., or spraying a colored spray on the waste paper, but these methods can be used to mark some or all of the paper that the inspection equipment has determined to be waste paper. The paper is then made into a non-defective item (hereinafter referred to as the correct paper).

), the disadvantage is that even if there is a request to use it as a mark, the mark will remain.

In addition, in the spray method, ink that disappears over time may be used, but in this case, although the above-mentioned disadvantages are resolved, depending on the time it is left, the ink disappears and the position of the waste paper becomes Sometimes it becomes unclear.

On the other hand, as another method, there is a method of inserting a display tape into a place where waste paper is piled up using a tape inserter. According to this method, once the display tape is removed, no trace remains on the printed matter, so there is no disadvantage that the mark remains as in the above-mentioned method.

Many inventions. Problems to be Solved> However, with tape inserters that insert indicator tape, the indicator tape is inserted into every piece of waste paper that is generated, so when a large number of waste papers occur in succession, it is necessary to insert the indicator tape into the tape inserter. There is a disadvantage that a large number of tape inserters are inserted, and the paper bulges up like a mountain, causing the paper to bend.Also, since it is necessary to use a series of tape inserters, the life of the tape inserter itself is shortened. there were.

Furthermore, if, for example, waste paper occurs continuously, then correct paper occurs once, and then waste paper occurs again continuously, the indicator tape will be inserted in almost the entire area during this time. , it becomes difficult to visually confirm the position of the correct paper.

The present invention was developed in view of the above circumstances, and is designed to clearly indicate the loading position of waste paper, prevent the occurrence of curling of printed matter, and extend the life of the tape inserter. The object of the present invention is to provide a display method and device.

Means for Solving the Problem> A method for indicating defective printed matter according to the present invention that achieves the above-mentioned object inspects the quality of printed matter printed by a sheet-fed printing machine, and then performs the inspection when stacking the printed matter. In a method for indicating defective printed matter by inserting an indicating tape based on the results to indicate whether the quality is good or bad, the first indicating tape is inserted when the successively stacked printed matter changes from a good product to a defective product, and the first display tape is inserted to indicate whether the defective product is good or not. The second display tape is inserted when the display changes to .

Further, the defective product display device for printed matter according to the present invention that achieves the above-mentioned object includes an inspection device that inspects the quality of printed matter printed by a sheet-fed printing machine, and a display based on the inspection results of the inspection device when stacking printed matter. A defective product display device for printed matter having a tape inserter for inserting a tape, comprising at least two tape inserters, and when the successively stacked printed matter changes from a good product to a defective product, the first tape inserter is actuated and the defective product is removed from the defective product. activating the second tape inserter when the tape becomes non-defective;
It is characterized by being equipped with a J control device.

Function> Out of the stacked printed matter, it is indicated that the printed matter is defective from the position where the first indicating tape is inserted to the position where the second indicating tape is inserted.

In this apparatus, a first tape inserter inserts a first display tape, and a second tape inserter inserts a second display tape.

Even if there are consecutive defective or good products, the first and second tape inserters do not operate, and the number of operations is substantially reduced.

Embodiments Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of the present invention. In Fig. 1, 11 is a plate cylinder, 12 is a blanket cylinder, 13 is an impression cylinder, 1
4 is a paper discharge cylinder.

The sheets are fed between the rubber 12 and the impression cylinder 13 and printed, and the printed products 15 are conveyed by a delivery chain 16 onto a paper stacking table 17 and stacked there one after another.

This device is equipped with a device for inspecting the quality of printed matter 15. This inspection device basically consists of a camera unit 18 as a detector that captures the condition of the paper surface after printing, which is fed to the impression cylinder 13, as image data, and an illumination unit that irradiates the surface of the printed material with high-intensity light. a rotary encoder 20 attached to the shaft end of the impression cylinder 13 to obtain a rotation synchronization signal, and a control unit 21 to which signals from the camera unit 18 and the rotary encoder 20 are input. reactor. Then, in this control unit 21, the reference image data of the printing paper surface captured by the camera unit 18 at the time of printing start and the camera unit 1 at the time of printing.
By comparing the judgment image data of the printed paper surface imported in step 8 in correspondence based on the signal from the rotary encoder 20, and determining whether the level difference between the two is within a predetermined tolerance range, the printing process is performed. This is to judge whether the quality is good or bad.

In FIG. 1, reference numeral 22 is a paper holding device of the AirPro 1 type.

On the other hand, above the paper stacking table 17, near the position where the printed matter 15 is stacked, there are first and second tape inserters 2.
3.24 is provided. These tape inserters 23. 24 are arranged in line along the conveyance direction of the printed matter 15, and are connected to a first display tape (waste paper tape) 25 and a second display tape (normal paper return tape), respectively, according to a signal from the control unit 21 of the inspection device. 26 onto the stacked printed matter 15.

Here, the signal S1 for activating the first tape inserter 23 is determined by the control unit 21 to
Output when the product changes from a good product to a defective product (when a defect occurs). On the other hand, the signal S2 for activating the second tape inserter 24 is output when the control unit 21 determines that the printed matter 15 changes from a defective product to a non-defective product (when returning to normal paper). Therefore, when there are successive good products or when there are successive defective products, the first or second tape inserter 23, 24 remains inoperative. This can be done by, for example, providing a flag in the control unit 2l to display the previous determination result, and outputting the signal S1 or S2 only when the determination result differs from the determination result indicated by this flag.

As shown in FIG. 2, which shows an example of the stacked printed matter 15 with the first and second display tapes 25 and 26 inserted, the first display table 25 and the second display tape It can be easily distinguished that the printed matter 15 in section a sandwiched between 26 and 26 is a defective product, and the other sections b and c are good products.

In the illustrated example, there is a position where the quality is inspected with the camera sweat 18 and a position where the printed matter 15 is stacked (paper stacking table 17).
), so even if the control snit 21 determines whether the tape is good or bad, the tape inserters 23 and 24 must not be operated immediately. In other words, the printed matter 1 that was subject to inspection
Tape inserter 23, 2 until tape 5 reaches above paper stacking table 17
It is necessary to delay the operation of 4. FIG. 3 shows an example of this control block diagram.

In Figure 3, the defect occurrence signal when a defect occurs and the normal paper return signal when the defect no longer occurs are as follows:
It is output in the control unit 21 in the form of one shot.

These signals are input to shift registers 27 and 28, respectively.

The shift registers 27 and 28 each have a latch,
While this latch records the signal indicating the occurrence of a defect and the return of normal paper, a pulse is input from the encoder 20 to the timing counter 29 for each revolution of the printing press impression cylinder 13, and each time this pulse is input, a plurality of pulses are generated. The signals indicating the occurrence of the defect and the return to normal paper are sequentially outputted in the form of pulses to the output terminal. For example, when one pulse of the timing counter is input, the left registers 27 and 28 output the above signal to the lowest terminal, and then when one pulse of the timing counter is input, the left registers 27 and 28 output the above signal from the lowest terminal. Output the above signal to the second terminal. The output terminals of the shift registers 27 and 28 can be selected arbitrarily by selectors 30 and 31, and an appropriate output terminal is selected depending on the distance between the inspection position and the loading position. Therefore, as in the illustrated example, when the fourth terminal from the bottom is selected, when the impression cylinder 13 rotates four times after inspection, the tape inserter 23.
outputs a signal 81, S2 that activates 24.

Here, the above-mentioned distance between the inspection position and the loading position is, in principle, unique to each printing press, and once the output terminal is appropriately selected, there is no need to change it. However, by providing a plurality of output terminals as described above, it is possible not only to support a plurality of models, but also to cope with changes in distance due to modification or the like.

In addition, in FIG. 3, the shift timing signal is obtained by the timing counter 29, but in addition, for example, the encoder 20
The shift timing signal may be obtained from the control unit 21 to which the signal is input.

By the way, in the embodiment shown in FIG. 1, since the tape inserters 23 and 24 are arranged side by side, the positions of the first and second display tables 25 and 26 to be inserted are shifted. Therefore, although the redisplay tapes 25 and 26 can be distinguished even if they are of the same color, if they are of different colors, they can be more clearly distinguished.

Further, the placement positions of the tape inserters 23 and 24 are not limited to this, but may be provided on the front side in the conveyance direction of the printed matter 15 in consideration of ease of visibility and ease of installation.
Alternatively, it may be positioned on the stomach side so as to sandwich the printed matter 15.

Further, the number of tape inserters 23 and 24 is not limited to two, and for example, a plurality of first tape inserters 23 that are activated when a defect occurs may be provided depending on the nature of the defect. That is, by inserting different display tapes 25 depending on the quality of the printed matter 15, such as misregistration, dirt, white spots, poor color tone, etc., the content of the defect can be seen at a glance, and the subsequent processing can be done easily. It is possible to facilitate the

Effects of the Invention> As described above in detail with reference to the embodiments, according to the present invention, it is possible to accurately know the position where waste paper is stacked after printing is completed.

As a result, it becomes easy to prevent defective products from being mixed in at the time of shipment.

Since the tape inserter does not operate continuously even if defective products are produced continuously, it is possible to extend the life of the tape inserter by reducing the number of operations, and also to prevent the tendency of printed matter to bend due to continuous insertion of display tape. It is also possible to eliminate this occurrence.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, FIG. 2 is a partial perspective view of stacked printed matter showing a state in which defective products are indicated by this method, and FIG. 3 is an I! It is a block diagram of I1llIy. In the drawings, 15 is a printed matter, 18 is a camera unit, 19 is a lighting unit, 20 is a rotary encoder, 21 is an illumination control unit, 22 is a paper presser, 23 is a first tape inserter 1, 24 is a second tape inserter, 25 is a first display tape, and 26 is a second display tape. Figure I Figure 2 Figure 20 Figure 3 Figure 29 27

Claims (2)

[Claims] (1) Inspect the quality of printed matter printed with a sheet-fed printing machine,
In the method for indicating defective printed matter in which the quality of the printed matter is indicated by inserting an indicating tape based on the result of the above inspection when the printed matter is stacked up, the first indicating tape is inserted when the successive stacked printed matter changes from a good product to a defective product. A method for indicating a defective product on a printed matter, characterized by inserting a second display tape when the defective product changes from a defective product to a non-defective product. (2) A defective product display device for printed matter having an inspection device for inspecting the quality printed by a sheet-fed printing press, and a tape inserter for inserting an indicating tape based on the inspection results of the inspection device when stacking the printed matter, at least There are two tape inserters, the first tape inserter is operated when the printed matter sequentially stacked changes from a non-defective product to a defective product, and the second tape inserter is activated when the printed matter changes from a defective product to a non-defective product.
and a control device for operating the tape inserter.