Dynamic pull gauge accurate fitting method and device

Abstract

The application discloses a dynamic rule accurate fitting method and device, and a light barrier ruler is molded on a printing paper, a corresponding light barrier ruler identifier is arranged in a paper conveying device, a servo motor is arranged on a offset printing device and is used for rule control, the light barrier ruler identifier is used for identifying the light barrier ruler on each printing paper, a processor is used for calculating a negative moving control signal corresponding to deformation data, and the servo motor is driven based on the control signal to perform rule control, without changing the position of a printing plate of a printing device, through dynamic adjustment of changing the paper rule, the printing paper is accurately fitted in two directions of X and Y axes, and accurate fitting of a positioning pattern and a printing pattern with a fitting deviation of 0.3 mm or less is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing registration, in particular to a dynamic registration pin accurate registration method and device. BACKGROUND

[0002] In the printing field, printing registration is a key step in the printing process. Especially in the cigarette label printing, more and more photolithography positioning papers are widely used, and the registration of the paper photolithography pattern and the printing pattern becomes a printing problem. At present, for the positioning pattern of the photolithography positioning paper, through the front-end design, the pattern is expanded, or the white ink is printed, or the gold stamping is used for the post-processing to avoid the registration difficulty, but the appearance is poor and the qualified rate is low due to the registration error. At the same time, with the more and more strict control of the cost of the cigarette label printing, the printing quality and the product delicacy are higher and higher, and the registration of the paper and the printing becomes a problem in the industry. Also because of the registration accuracy problem, in the cigarette label development process, the process accumulation is used to avoid the registration problem.

[0003] At present, the photolithography positioning paper is mainly completed by the offset printing, and the registration accuracy of the paper is 0.3mm. The main reason is that in the manufacturing process of the positioning paper, the plastic deformation of the PET film is unstable under the tension change during the mold pressing, the compounding and the transferring, and the deformation of the inside and outside of the whole roll is not the same, the deformation of the rolls is not the same, and in addition, due to the cutting rule error (more than 0.1mm) of the cutting, the positioning pattern of the positioning paper and the printing pattern are not registered accurately, which leads to the increase of the waste rate. SUMMARY

[0004] In order to solve the problems of the prior art, the present application dynamically adjusts the registration pin position through the dynamic control of the registration pin of the front-end of the printing paper conveying on the offset printing machine, realizes the improvement of the registration accuracy of the printing and the paper, and achieves the purpose of accurate registration. The present application adopts the following technical scheme:

[0005] A dynamic registration pin accurate registration method comprises the following steps:

[0006] Step S1: mold pressing a grating ruler on the printing paper;

[0007] Step S2: setting a grating ruler identifier in the paper conveying device of the offset printing paper conveying system;

[0008] Step S3: setting a servo motor on the offset printing device for registration pin control;

[0009] Step S4: the grating ruler identifier identifies the grating ruler on each printing paper, and then the processor calculates the negative moving control signal corresponding to the registration pin and the side gauge deformation data, and drives the servo motor to control the registration pin based on the control signal.

[0010] Further, in step S1, the printing grating ruler is arranged on the paper die plate, and then the printed paper is die-cut to make the die-cut printed paper still have the complete printing grating ruler.

[0011] Further, in step S1, the front gauge grating ruler and the side gauge grating ruler are arranged in the X and Y axis directions of the paper die plate respectively, and the front gauge grating ruler and the side gauge grating ruler are still kept complete after die-cutting; in step S2, the front gauge grating ruler and the side gauge grating ruler on the printed paper are identified by the front gauge and side gauge grating ruler identifier respectively.

[0012] Further, the completeness of the grating ruler refers to that the paper grating ruler is marked on the trailing edge of the die-cut printed paper and the side gauge.

[0013] Further, in step S3, the front gauge and side gauge servo motors are arranged on the front gauge and side gauge of the offset printing device respectively to control the one-way movement of the front gauge and side gauge.

[0014] Further, in step S4, the grating ruler identifier generates the black-and-white interference stripes through the dynamic change of the paper grating ruler, and converts the black-and-white interference stripes into electrical signals and transmits the electrical signals to the PLC processor.

[0015] Further, in step S4, the gauge control is performed by changing the moving positions of the front gauge paper stop plate and the side gauge paper stop plate to make the paper and the printing plate register.

[0016] A dynamic gauge control accurate register device comprises a grating ruler identifier, a servo motor and a controller, a grating ruler is die-cut on the printed paper, a servo motor is arranged on the offset printing device, the grating ruler identifier identifies the grating ruler on the printed paper, the processor calculates the negative moving control signal corresponding to the gauge and side gauge deformation data, and the servo motor is driven based on the control signal to perform the gauge control.

[0017] Further, the grating ruler comprises a front gauge grating ruler and a side gauge grating ruler, which are arranged in the X and Y axis directions of the paper die plate respectively, and the front gauge grating ruler and the side gauge grating ruler are still kept complete after die-cutting; the grating ruler identifier comprises a front gauge and side gauge grating ruler identifier, which are used to identify the front gauge grating ruler and the side gauge grating ruler on the printed paper respectively.

[0018] Further, the servo motor comprises a front gauge and side gauge servo motor, which is used to control the one-way movement of the front gauge and side gauge.

[0019] The advantages and beneficial effects of the present application are as follows:

[0020] The method and device for accurately positioning paper by dynamic pull gauge, without changing the position of printing plate of printing equipment, can achieve accurate positioning of paper positioning pattern and printing pattern in X and Y axes by changing the dynamic adjustment of paper gauge, i.e. by controlling the position of pull gauge paper stop board by servo motor, and making dynamic negative response according to the deformation of front gauge and side gauge, the moving distance of paper stop board is equal to the error value of paper in X and Y axes, so as to realize accurate positioning of positioning pattern and printing pattern with the deviation of paper positioning within 0.3mm. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a flow chart of the method for accurately positioning paper by dynamic pull gauge in the embodiment of the present application.

[0022] Figure 2a is a schematic diagram of dynamic register of positioning pattern in front gauge direction in the embodiment of the present application.

[0023] Figure 2b is a schematic diagram of dynamic register of positioning pattern in side gauge direction in the embodiment of the present application.

[0024] Figure 3 is a structural schematic diagram of the device for accurately positioning paper by dynamic pull gauge in the embodiment of the present application.

[0025] Figure 4 is a schematic diagram of dynamic pull gauge paper feeding structure in the embodiment of the present application. DETAILED DESCRIPTION

[0026] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0027] As shown in Figure 1 , Figure 2a , Figure 2b , a method for accurately positioning paper by dynamic pull gauge comprises the following steps:

[0028] Step S1: pressing optical grating ruler on printing paper;

[0029] Specifically, printing optical grating ruler is arranged on paper pressing plate, and the integrity of optical grating ruler of printing paper after cutting is ensured by pressing.

[0030] The optical grating ruler comprises front gauge optical grating ruler and side gauge optical grating ruler, which are arranged in X and Y axes of paper pressing plate, and the integrity of front gauge and side gauge optical grating ruler of printing paper after cutting is ensured by pressing.

[0031] In the embodiment of the present application, the front gauge and the side gauge grating ruler are 3mm*10mm long strips, and one or more strips can be arranged respectively. The grating ruler is photoetched with 0.01mm*0.01mm parallel grating lines, and the back of each paper and the side gauge are marked with paper grating ruler through mold pressing.

[0032] Step S2: setting the front gauge and the side gauge grating ruler identifier in the paper conveying device of the offset printing paper conveying system;

[0033] In the embodiment of the present application, the front gauge and the side gauge grating ruler identifier are respectively installed in the middle of the pneumatic conveying or the conveying belt of the offset printing paper conveying system;

[0034] Step S3: setting the servo motor in the front gauge and the side gauge of the offset printing, which is used to control the one-way movement of the front gauge and the side gauge;

[0035] Step S4: the front gauge and the side gauge grating ruler identifier identifies the front gauge and the side gauge grating ruler on each paper, and then the processor calculates the negative movement control signal corresponding to the deformation data of the front gauge and the side gauge, and drives the servo motor to control the front gauge and the side gauge based on the control signal.

[0036] Specifically, the grating ruler identifier generates black and white interference fringes through the dynamic change of the paper grating ruler, and converts the black and white interference fringes into electrical signals and transmits them to the PLC processor.

[0037] The front gauge control is achieved by changing the moving position of the front gauge paper stop plate, and the side gauge control is achieved by changing the moving position of the side gauge paper stop plate.

[0038] In the embodiment of the present application, the PLC processor is used to identify the front gauge and the side gauge grating ruler on each paper through the grating ruler identifier, obtain the deformation data electrical signal of the front gauge and the side gauge, and transmit it to the PLC processor. After calculation by the PLC processor, the control signal of the dynamic negative movement data is generated and transmitted to the servo motor of the front gauge and the side gauge, and the servo motor of the front gauge and the side gauge controls the position of the paper stop plate of the front gauge based on the control signal with the dynamic negative movement data, so as to achieve the accurate registration of the paper in the X and Y axis directions.

[0039] The traditional front gauge and the side gauge are fixed in the X and Y axis directions, and the present application uses the grating ruler to identify the deformation amount of the paper in the X and Y axis directions. After the grating ruler data is calculated by the PLC controller, it is transmitted to the servo motor of the front gauge and the side gauge, and the servo motor controls the dynamic movement data of the front gauge. The fixed front gauge is added with the servo motor, and the movement amount of the front gauge is dynamically controlled, so as to achieve the purpose of the registration of the printing pattern and the paper, that is, the printing plate of the printing machine is fixed, and if the pattern of the paper fluctuates, the front gauge is adjusted. The dynamic front gauge controls the deformation fluctuation of the paper, so as to solve the accurate registration problem of the positioning pattern on the paper and the printing pattern.

[0040] AsFigure 3 , Figure 4 As shown, a dynamic guide gauge precision positioning device includes a grating ruler identifier, a servo motor, and a controller. The grating ruler includes a front guide grating ruler and a side guide grating ruler. The grating ruler identifier includes front and side guide grating ruler identifiers. The servo motor includes front and side guide servo motors, which are respectively installed on the front and side guides of the offset printing device. The grating rulers are molded on the printing paper, that is, they are set in the X and Y axis directions of the paper molding plate, and the integrity of the front and side guide grating rulers is maintained after molding and cutting. The front and side guide grating ruler identifiers respectively identify the front and side guide grating rulers on the printing paper and send them to the PLC processor. The PLC processor then calculates the negative movement control signal corresponding to the deformation data of the guide gauge and the side guide, and drives the servo motors of the front and side guides to control the unidirectional movement of the guide gauge and the side guide.

[0041] By molding a grating ruler onto the printed paper, a front-mounted grating ruler recognizer dynamically identifies changes in the paper's grating ruler based on the grating and collects the data. After analysis by a PLC processor, the deformation data of the front and side gauges is determined. The PLC processor then calculates the data to be moved based on the electrical signals of the deformation data of the front and side gauges, and generates control signals based on the movement data. These control signals are transmitted to the servo motors loading the front and side gauges. Based on the control signals, the servo motors change the moving positions of the front and side gauge stop plates to achieve paper-plate registration.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dynamic pull gauge accurate fitting method, characterized in that It comprises the following steps: Step S1: embossing a grating ruler on the printed paper; In the step S1, the grating ruler is set on the paper embossing plate, and then the printed paper is embossed and cut, so that the cut printed paper still has a complete grating ruler; In the step S1, the front gauge grating ruler and the side gauge grating ruler are respectively set in the X and Y axis directions of the paper embossing plate, and the front gauge grating ruler and the side gauge grating ruler remain complete after embossing and cutting; the grating ruler has photoetching parallel grating lines; Step S2: setting a grating ruler identifier in the paper conveying device; the front gauge and side gauge grating ruler identifiers respectively identify the front gauge grating ruler and the side gauge grating ruler on the printed paper; Step S3: setting a servo motor on the offset printing device for gauge control; Step S4: the grating ruler identifier identifies the grating ruler on each printed paper, the grating ruler identifier generates black and white interference stripes through the dynamic change of the paper grating ruler, and converts the black and white interference stripes into an electrical signal and transmits the electrical signal to a processor; the processor calculates a negative moving control signal corresponding to the deformation data, and drives the servo motor to perform gauge control based on the control signal; the gauge control is performed by changing the moving positions of the front gauge and side gauge paper stop plates to perform paper and plate register.

2. The method of claim 1, wherein: The completeness of the grating ruler refers to that the paper grating ruler is marked on the trailing edge of each cut printed paper and the side gauge.

3. The method of claim 1, wherein: In the step S3, front gauge and side gauge servo motors are respectively set on the front gauge and side gauge of the offset printing device for controlling the one-way movement of the front gauge and side gauge.

4. A dynamic calliper precision locating device using the dynamic calliper precision locating method of claim 1, comprising a grating ruler identifier, a servo motor, a controller, characterized in that: In the step S3, front gauge and side gauge servo motors are respectively set on the front gauge and side gauge of the offset printing device for controlling the one-way movement of the front gauge and side gauge.

5. The dynamic calliper precision sizing device of claim 4, wherein: In the step S3, front gauge and side gauge servo motors are respectively set on the front gauge and side gauge of the offset printing device for controlling the one-way movement of the front gauge and side gauge. The servo motor comprises front gauge and side gauge servo motors for controlling the one-way movement of the front gauge and side gauge.

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