JP2004188642A - Method for preventing printing plate from being mounted by mistake in printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent a PS printing plate for printing from being mounted by mistake which has been conventionally a problem, and to reduce defective printing and paper waste. <P>SOLUTION: To prevent the PS printing plate from being mounted by mistake in a printing machine in which the PS printing plate 1 is mounted on a printing plate cylinder to perform printing, a printing plate mounting position information added in advance on the PS printing plate 1 is read by a reading mechanism 13 to convert it into a specified code signal, and the content of the code signal is displayed as an uneven code or an hole arranging code on a non-printed part of a gripper end of the PS printing plate by an uneven processing or a hole-making machine 15. After the PS printing plate is mounted on the printing plate cylinder, the uneven code or the hole arranging code is read by an optical sensor, and the content of the printing plate mounting position information and the content of the information read by the optical sensor are collated with each other. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a printing press that reliably prevents a mistake in the mounting position of a printing PS printing plate for a sheet-fed printing press, a newspaper rotary press, and a commercial offset rotary press using a PS printing plate, and reduces defective printing and waste paper. The present invention relates to a printing plate erroneous mounting prevention method.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an offset sheet-fed printing press or a rotary printing press uses a PS plate (Pre-Sensitized Plate) as a printing plate to which a photosensitive substance has been applied in advance. The PS printing plate is a high-purity aluminum plate having a thickness of about 0.8 mm, and the size varies depending on the printing model.
[0003]
The printing contents are exposed to a film, developed, and gummed on the PS plate by a plate making machine. Next, the top side (holding side) and the ground side (holding side) are accurately bent by a plate bending machine (bender) to be attached to the printing plate cylinder on the printing press side. Then, the PS printing plate is mounted on a printing plate cylinder after a printing register pin hole is formed.
[0004]
Recently, it has been put to practical use to directly make image data on a PS printing plate by using CTP (Computer to Plate) without using a film.
[0005]
FIG. 6 shows an example of a plate clamping mechanism provided on the printing plate cylinder side in a printing press. This plate clamping mechanism comprises a plate clamping portion and a plate holding portion, and is located on the operation side and the drive side. The PS printing plate 1 is mounted by hooking the grip side 1a of the plate, rotating the printing plate cylinder 2 once while winding, and pulling the grip tail side 1b by a plate clamping mechanism. The mechanism of the plate clamping is that the ring 3 of the plate clamping portion is turned by a lever to rotate the cam 4 of the gripper, and the cam 4 pushes the back portion of the plate clamping spring (leaf spring) 5 so that the gripper side 1b is held. It is designed to have tension and fix it.
[0006]
By the way, recently, the number of printing plates mounted per printing press configuration has increased due to the multi-page, color printing, etc. of offset printing presses (in the case of color printing, there are four types of PS: yellow, red, indigo, and black). Printing plates are required), and printing mistakes due to erroneous mounting occur frequently. For example, in the case of a 48-page newspaper rotary press and a full color printer, 192 sheets are installed, but it is difficult to read the printed PS printing plate, and this causes an installation error. At present, the plate making operator hand-writes the plate mounting position information on the back side of the plate and transmits it to the printing operator. However, it is difficult to eliminate the mounting error.
[0007]
As a method for checking the mounting position of the printing plate, there is a method proposed in the following Patent Document.
[0008]
[Patent Document 1] JP-A-10-202840
[Problems to be solved by the invention]
Some newspaper companies that use a large number of newspaper rotary presses have around 1,000 printing plates a day, and two or three printing plates are erroneously installed every day. In addition, it is possible to prevent a mistake of continuing printing with an incorrect mounting, and there is little outflow to the outside. However, the burden at the time of work is large.
[0010]
SUMMARY OF THE INVENTION The present invention provides a method for preventing a printing plate from being improperly mounted, which can surely prevent a mounting position error of a printing PS printing plate, which has conventionally been a problem, and can reduce defective printing and waste paper. The purpose is to:
[0011]
Other objects and novel features of the present invention will be clarified in embodiments described later.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 of the present application is directed to a printing plate printing plate erroneous mounting for preventing a printing plate from being mounted erroneously in a printing press which mounts a PS printing plate on a printing plate cylinder and performs printing. Prevention method,
The printing plate mounting position information previously attached to the PS printing plate is read by a reading unit, converted into a predetermined code signal, and the content of the code signal is transferred to the non-printing portion of the PS printing plate at the edge of the PS printing plate. After the PS plate is mounted on the printing plate cylinder, the arrangement code of the irregularities or holes is read by an optical sensor, and the contents of the plate mounting position information and the reading of the optical sensor are read. It is characterized by collating with the contents of information.
[0013]
The invention according to claim 2 of the present application is a method of preventing a printing plate from being erroneously mounted, wherein the printing plate is mounted on a printing plate cylinder and printing is performed, thereby preventing erroneous mounting of the PS plate.
The plate mounting position information pre-attached to the PS plate was read by a reading means, converted into a predetermined code signal, and the content of the code signal was attached to the non-printing portion of the PS plate. After writing the data on an IC tag and mounting the PS printing plate on the printing plate cylinder, read the writing information of the IC tag with an IC tag reader, and read the contents of the printing plate mounting position information and the reading information of the IC tag reader. It is characterized in that it is compared with the contents of.
[0014]
According to a third aspect of the present invention, there is provided a printing plate erroneous mounting prevention method according to the first aspect, wherein the optical sensor irradiates a laser beam to the arrangement code of the irregularities or holes, and the arrangement code is formed by displacement of the reflected light. It is characterized by reading.
[0015]
The method of preventing printing plate erroneous mounting according to the invention of claim 4 of the present application is the method according to claim 1 or 3, wherein the arrangement code of the irregularities or holes in the PS printing plate after being mounted on the printing plate cylinder is replaced with the printing plate. It is characterized in that the light is read by the optical sensor after the body starts rotating and before it reaches steady high-speed rotation.
[0016]
The printing plate printing plate erroneous mounting prevention method according to the invention of claim 5 of the present application is the method according to claim 2, wherein the printing plate cylinder rotates the printing information of the IC tag on the PS plate after being mounted on the printing plate cylinder. After the start, before reaching the steady high-speed rotation, reading is performed by the IC tag reader.
[0017]
According to a sixth aspect of the present invention, there is provided a printing plate incorrect mounting prevention method according to the first, second, third, fourth, or fifth aspect, wherein the content of the printing plate mounting position information is not printed on a side edge of the PS printing plate. It is characterized by being written in Japanese in the section.
[0018]
According to a seventh aspect of the present invention, there is provided the printing plate erroneous mounting prevention method according to the first, second, third, fourth, fifth, or sixth aspect, wherein the code signal is a BCD signal or a binary signal.
[0019]
The method of preventing printing plate erroneous mounting according to claim 8 of the present invention is the method of claim 1, 2, 3, 4, 5, 6, or 7, wherein when the result of the comparison indicates erroneous mounting, It is characterized by issuing an alarm by a monitor.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a method of preventing a printing plate from being erroneously mounted according to the present invention will be described with reference to the drawings.
[0021]
A first embodiment of the present invention will be described with reference to FIGS. The plotter 10, the automatic developing machine 11 and the plate making machine 12 are controlled by an upper host computer, the print contents are exposed to a film by the plotter 10, developed by the automatic developing machine 11, and the PS plate is made by the plate making machine 12. At this time, the PS printing plate includes “print name, month, day, day of the week, printing press configuration column (set including a plurality of printing presses; Set-No.), "Printing machine information", mounting cylinder position (indicating which cylinder in the printing machine), page number, color, etc. (hereinafter referred to as "printing plate mounting position information") It is displayed as a code.
[0022]
It should be noted that the film may be printed on the film by using the plotter 10 manually instead of the host computer, or the image data may be directly made on a PS plate without using the film.
[0023]
Next, in the present embodiment, processing is performed on the PS printing plate along the path indicated by the solid line (1). First, the printing plate mounting position information indicated by a bar code or the like is read by the mounting information reading mechanism 13 and is converted into a predetermined code signal such as a BCD code or a binary code by a printing plate erroneous mounting prevention system computer. Here, as shown in FIG. 2, the mounting information reading mechanism 13 includes an optical reading means (CCD camera or the like) 14 such as a bar code reader and a printing device for creating a code signal such as a BCD code and a binary code from the read signal. The system includes a plate improper mounting prevention system computer, and the optical reading means 14 is disposed above the transport path of the PS printing plate 1.
[0024]
A code signal such as a BCD code and a binary code from the mounting information reading mechanism 13 is processed by a mounting information unevenness processing (press) or punching machine 15 to form an unevenness or hole array code 20 as a non-printing portion of the PS printing plate 1. Formed. As shown in FIG. 2, the mounting information concavo-convex processing or punching machine 15 is disposed downstream of the mounting information reading mechanism 13 in the transport path of the PS printing plate 1. As shown in FIG. 3 (B), the arrangement code 20 of the irregularities or holes is provided on the non-printing portion at the edge of the PS plate 1 (a position observable from the outside) at a predetermined interval of, for example, 10 to 30 mm. Alternatively, the holes are arranged. FIG. 3C shows an example of the unevenness to be formed, and FIG. 3D shows an example of the hole. The diameter of the unevenness and the hole is preferably in a range of 2 mm to 8 mm so that an optical sensor using laser light described later can surely detect the unevenness. preferable. The depth in the case of unevenness is preferably 1 mm or more. About 5 to 8 irregularities or holes are formed at a constant arrangement interval on one printing paper surface. For example, in the case of a newspaper rotary press, one arrangement code 20 is assigned to one page.
[0025]
In addition to the formation of the irregularity or hole arrangement code 20, the contents read by the mounting information reading mechanism 13 in the empty space of the non-printing portion of the PS plate 1 by the printer 16 in FIG. Position information) is converted into Japanese, printed and written together, so that the print operator can easily read the information. This Japanese description is effective in reconfirming the mounting position.
[0026]
After the processing by the mounting information reading mechanism 13, the mounting information unevenness processing or the punching machine 15 and the printer 16, the PS printing plate 1 is mounted on the printing plate cylinder by the printing plate bending machine 17 as shown in FIG. The lip side and the butt side are bent and formed. Thus, the process for the PS printing plate 1 is completed, and the printing operator designates a predetermined printing plate cylinder in a predetermined printing press of a predetermined printing press configuration row (predetermined Set-No.) To print the PS printing plate. Transport. In this case, the printing operator designates the printing plate cylinder by seeing what the plate making operator has handwritten the plate mounting position information on the back of the printing plate.
[0027]
As shown in FIGS. 3A and 3B, in the PS printing plate 1 mounted on a predetermined printing plate cylinder 2 of a predetermined printing press of a predetermined printing press configuration row specified by a printing operator, a holding edge is provided. The arrangement code 20 of the irregularities or holes formed in the non-printing portion is located at a position where it can be observed from the outside, and after the rotation of the printing plate cylinder 2 by the displacement laser sensor 31 as an optical sensor in FIG. Before reaching rotation (preferably near the lowest rotation speed), the arrangement code 20 of the irregularities or holes is read and converted into an electric signal. In this case, the displacement laser sensor 31 has a set of visible light semiconductor lasers and a light receiving unit for receiving the reflected light for the number of the concavities and convexities or holes. The arrangement code is read by detecting the presence or absence of irregularities or holes based on the presence or absence of displacement of the reflected light. The measurement distance of the displacement laser sensor 31 is 500 to 600 mm (placed at a distance of 500 to 600 mm from the PS plate mounted on the printing plate cylinder), the resolution is 8 to 100 μm, and the displacement laser sensor 31 has By irradiating a laser beam to the arrangement code 20 of the irregularities or holes in synchronization with the rotational position of the printing plate cylinder 2 when the arrangement code 20 faces, the arrangement code 20 can be reliably read. The displacement laser sensor 31 is one per sheet, and one per newspaper in the case of a newspaper.
[0028]
Next, the printing plate mounting position information (for example, stored in a host computer) set in advance and the content of the read information of the displacement laser sensor 31 are collated to determine good or bad, and On the side, a new plate mounting monitor displays information on whether the PS plate has been mounted correctly or not, as well as information on whether the PS plate has not been reached. If the PS plate is defective or not mounted, an alarm is generated on the monitor indicating that the PS printing plate is erroneously mounted or not mounted. The information is recorded and can be printed out.
[0029]
According to the first embodiment, the following effects can be obtained.
[0030]
(1) All the steps up to forming the arrangement code 20 of irregularities or holes on the PS printing plate 1 can be automated, and the operator does not intervene. For this reason, the read information obtained by reading the array code 20 by the displacement laser sensor 31 should completely match the plate mounting position information stored in the host computer or the like. It can be detected as mounting (it is found that there is an error in the designation of the printing press configuration column (Set-No.) Of the printing operator, the printing press, and the printing plate cylinder).
[0031]
(2) Before the printing plate cylinder of the printing press reaches the high-speed steady rotation, the displacement laser sensor 31 reads the arrangement code 20 of the irregularities or holes, so that an alarm is issued early and the printing press is stopped, thereby causing defective printing or damage. Paper can be reduced.
[0032]
In the second embodiment of the present invention, after plate making by the plate making machine 12 of the PS printing plate 1 of FIG. 1, processing is performed along the dotted line (2) in FIG. That is, after the PS printing plate 1 is bent by the printing plate bending machine 17, the processing by the mounting information reading mechanism 13, the mounting information unevenness processing or the punching machine 15 and the printer 16 is performed. The details of each process are the same as those of the first embodiment, and the same operation and effects as those of the first embodiment can be obtained except that the bending procedure is different.
[0033]
In the third embodiment of the present invention, as shown by a dotted line in FIG. 2, instead of the arrangement code 20 of the unevenness or holes by the mounting information unevenness processing or the punching machine 15 in the first or second embodiment. The IC tag 50 attached (strongly bonded) to the non-printing portion at the edge of the PS printing plate 1 is used. That is, a code signal such as a BCD code and a binary code from the mounting information reading mechanism 13 is written to the IC tag 50 affixed to the PS plate 1 by a reader / writer used in the non-contact IC card system (data transfer). Do). When the PS plate is mounted on the printing plate cylinder, a part of the IC tag is structured to prevent the IC plate from falling off by utilizing the plate holding mechanism of the printing press. The outer shape, thickness, and shape of the IC tag 50 are extremely small.
[0034]
The printing operator handwritten the plate mounting position information on the back side of the plate from the PS plate on which the printing of the plate mounting position information on the IC tag 50 and the folding process by the plate folding machine 17 were completed. Then, the PS plate is transported by designating a predetermined printing plate cylinder in a predetermined printing press of a predetermined printing press configuration row (predetermined Set-No.). Then, as shown in FIG. 5B, in the PS printing plate 1 mounted on a predetermined printing plate cylinder 2 in a predetermined printing press of a predetermined printing press configuration row, the PS printing plate 1 is affixed to a non-printing portion at the tail edge. The recording information of the IC tag 50 (wirelessly transmitted from the IC tag 50) is transmitted to the IC tag reader 51 (a reader / writer used in the non-contact IC card system), after the printing plate cylinder 2 starts rotating, and then at a steady high speed. (Preferably near the lowest rotation speed). It is preferable that the IC tag reader 51 is arranged at a distance of 400 to 500 mm from the PS plate mounted on the printing plate cylinder. The number of the IC tag readers 51 is one per sheet, and one per page for newspapers.
[0035]
Further, the printing plate mounting position information (for example, stored in the host computer) set in advance and the contents of the read information of the IC tag reader 51 are compared to determine good or bad, and On the newly installed printing plate mounting monitor displays information such as whether the PS printing plate has been mounted correctly or not, as well as information about whether the PS printing plate has not been reached. If the PS plate is defective or not mounted, an alarm is generated on the monitor indicating that the PS printing plate is erroneously mounted or not mounted. The information is recorded and can be printed out.
[0036]
In the case of the third embodiment, the same effects as in the first embodiment can be obtained except that the cost of the IC tag is generated.
[0037]
Although the embodiments of the present invention have been described above, it will be obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims.
[0038]
【The invention's effect】
As described above, according to the printing plate improper mounting prevention method according to the present invention, it is possible to reliably prevent the mounting position of the printing PS printing plate, which has been a problem in the related art, and to thereby prevent defective printing or waste paper. Reduction can be achieved.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing first and second embodiments of a method for preventing a printing plate from being erroneously mounted according to the present invention.
FIG. 2 is an explanatory diagram showing a mounting information reading mechanism and mounting information unevenness processing or an arrangement of a punching machine in the first embodiment;
FIG. 3 is an explanatory diagram showing an example of positions and arrangements of arrangement codes of irregularities or holes formed by a mounting information irregularity processing or a punching machine, and irregularities and holes in the first embodiment.
FIG. 4 is an explanatory diagram showing the arrangement and operation of the plate bending machine according to the first embodiment.
FIG. 5 is an explanatory diagram showing a sensor (reader) arrangement in the first and second embodiments of the present invention.
6A and 6B are plate clamping mechanisms for mounting a PS printing plate on a printing plate cylinder, wherein FIG. 6A is a cross-sectional view and FIG. 6B is a perspective view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 PS printing plate 1a Holding side 1b Holding bottom side 2 Printing plate cylinder 10 Plotter 11 Automatic developing machine 12 Plate making machine 13 Mounting information reading mechanism 14 Optical reading means 15 Mounting information unevenness processing or perforator 16 Printer 17 Printing plate bending machine 20 Sequence code 31 Displacement laser sensor 50 IC tag 51 IC tag reader

Claims (8)

A printing press printing plate erroneous mounting prevention method for preventing erroneous mounting of the PS printing plate in a printing press that performs printing by mounting a PS printing plate on a printing plate cylinder,
The printing plate mounting position information previously attached to the PS printing plate is read by a reading means, converted into a predetermined code signal, and the content of the code signal is transferred to the non-printing portion of the PS printing plate at the edge of the PS printing plate. After the PS plate is mounted on the printing plate cylinder, the arrangement code of the irregularities or holes is read by an optical sensor, and the contents of the plate mounting position information and the reading of the optical sensor are read. A method for preventing erroneous mounting of a printing plate, comprising collating information contents. A printing press printing plate erroneous mounting prevention method for preventing erroneous mounting of the PS printing plate in a printing press that performs printing by mounting a PS printing plate on a printing plate cylinder,
The plate mounting position information pre-attached to the PS plate was read by a reading means, converted into a predetermined code signal, and the content of the code signal was attached to the non-printing portion of the PS plate. After writing the data on an IC tag and mounting the PS printing plate on the printing plate cylinder, read the writing information of the IC tag with an IC tag reader. A method for preventing erroneous mounting of a printing plate, comprising collating with the contents of a printing press. 2. The printing plate improper mounting prevention method according to claim 1, wherein the optical sensor irradiates a laser beam to the arrangement code of the irregularities or holes, and reads the arrangement code by displacement of reflected light. 4. The optical sensor according to claim 1, wherein the arrangement code of the irregularities or holes in the PS printing plate after being mounted on the printing plate cylinder is read by the optical sensor after the printing plate cylinder starts rotating and before reaching a steady high-speed rotation. 5. How to prevent incorrect mounting of printing plate. The printing according to claim 2, wherein the IC tag reader reads the write information of the IC tag in the PS printing plate after being mounted on the printing plate cylinder, after the printing plate cylinder starts rotating and before reaching a steady high-speed rotation. How to prevent improper mounting of printing plate. 6. The printing plate improper mounting prevention method according to claim 1, 2, 3, 4, or 5, wherein the contents of the plate mounting position information are written in Japanese on a non-printing portion at the edge of the PS plate. The method according to claim 1, 2, 3, 4, 5, or 6, wherein the code signal is a BCD signal or a binary signal. 8. The printing plate improper mounting prevention method according to claim 1, wherein an alarm is issued by a printing plate mounting monitor when the collation result indicates improper mounting.

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