CN103847225A - Method for controlling printing unit inking mechanism by using angle position of paper-feeding main shaft - Google Patents

Abstract

The purpose of the present invention is to provide a method that can accurately calculate the real-time transmission position of the cardboard according to the rotation angle position of the paper feeding spindle during the printing process, and at the same time accurately control the inking mechanism of each printing unit to start at the initial position of the respective printing plate Inking or detaching from the printing plate is not affected by the rotating speed of the machine, which improves the yield and production efficiency and reduces the production cost of the carton printing machine printing ink control method. The purpose of the present invention can be achieved through the following technical proposals: a method for controlling the inking mechanism of a printing unit by using the angular position of the paper-feeding spindle includes: a paper-feeding servo driver module and an optocoupler conversion module.

Description

A Method of Controlling the Inking Mechanism of a Printing Unit Using the Angular Position of the Paper Feed Main Shaft

Technical field:

The invention relates to the field of carton printing machinery, in particular to an inking control method of a printing unit of a printing machine.

Background technique:

In the carton printing machine, multiple printing units will be configured, and only through the color printing of each printing unit can the bright and exquisite patterns be printed. An anilox roller for inking is installed in the inking mechanism of each printing unit. The inking mechanism can control the rise and fall of the anilox roller to control the contact or separation between the anilox roller and the printing plate to achieve inking printing or not. Inking stops printing. When the carton printing machine is not printing and stops printing, the anilox roller should be separated from the printing plate and not inked, otherwise the repeated inking of the printing plate will increase the inking thickness of the printing plate and deepen the color of the pattern, which is inconsistent with the printed pattern during normal printing. Since a carton printing machine is composed of multiple printing units, from the first group of printing units to the second group... until the last group of printing units, each group of printing units starts printing at different times, which means It is necessary to set the time when each group starts printing to determine the time when the anilox roller starts to ink the printing plate. Similarly, when the printing stops, the anilox roller should also be detached from the printing plate in a certain time sequence to stop inking.

The current control method of the inking mechanism for the anilox roller to start inking and leave the printing plate is to estimate the transmission position of the cardboard according to the speed of the machine, and then control the inking mechanism to descend, so that the anilox roller contacts the printing plate for inking. Because in the complex working environment of printing production, it is difficult to accurately control the inking position and the arrival position of the cardboard, and the inking mechanism will drop prematurely or delay the inking, resulting in thick or shallow color of the first few printed cardboard patterns . Simultaneously, every time the inking mechanism descends and touches the inking position of the printing plate, because the starting position of the printing plate cannot always be guaranteed, the cardboard pattern has half-dark and half-light color difference, causing the first few sheets of cardboard to be printed to be scrapped.

In addition, when using the counting batch mode for production, that is, every time the set number of sheets (batch) is counted, the paper feeding will be stopped once, and then the automatic cycle counting of paper feeding will be started to print the next batch. Paper work, coupled with the inaccuracy of ink control, often makes the color of the first few cardboard patterns printed on each paper feeding printing and the effect of subsequent cardboard printing patterns inconsistent, so that this mode cannot be used very well.

Invention content:

The purpose of the present invention is to provide a method that can accurately calculate the real-time transmission position of the cardboard according to the rotation angle position of the paper feeding spindle during the printing process, and at the same time accurately control the inking mechanism of each printing unit to start at the initial position of the respective printing plate Inking or detaching from the printing plate is not affected by the speed of the machine, which improves the yield and production efficiency and reduces the production cost of the carton printing machine printing ink control method.

The object of the present invention can be achieved through the following technical solutions: A method for controlling the ink striking mechanism of a printing unit by using the angular position of the paper feeding spindle includes: a paper feeding servo driver module and an optocoupler conversion module.

The implementation steps of the control method of the present invention:

Step 1. The present invention utilizes the advantages of high precision and high dynamic response of the servo control system to realize the above-mentioned control, and pre-calculates the angle pulse value corresponding to the inking position of each printing unit according to the arc length formula and the circle center angle calculation formula, and each group The customized angular pulse value corresponds to the position of the carton transport and the inking position of the printing plate of each printing unit. Then edit these pulse values in the angle position trigger function table of the servo driver module of the paper feeding spindle, and set the output terminal address corresponding to the trigger output, and connect the output terminal to the optocoupler conversion module of each corresponding printing unit, the optocoupler The conversion module is wired to control the cylinder solenoid valve of the unit's inking mechanism.

Step 2. When the paper feeding starts, the first cardboard is sent out from the zero point (0°) of the paper feeding spindle, and when it reaches the printing position of the first printing unit, the starting position of the printing plate on the printing cylinder at this time ( The non-printing area R) is also rotating to the position area in contact with the anilox roller, and at the same time, the paper feeding spindle just rotates to the trigger angle position corresponding to the unit, and triggers the inking mechanism of the unit to be at the starting position of the printing plate (no printing Area R) begins to drop contact inking.

Step 3. When the paper feeding spindle continues to rotate to the customized triggering angle corresponding to the next unit (printing unit 2), the inking mechanism of the printing unit will be triggered in sequence according to the above method to be at the starting position of the printing plate (no printing area R) Driven by the cylinder, it begins to descend, and the anilox roller contacts the printing plate attached to the printing plate roller for inking, until the inking mechanism of the last printing unit that triggers the completion of the machine configuration is lowered, and all the inking mechanisms of the printing units are descending After that, it will keep working at the inking position, so that the amount of ink on the first cardboard is guaranteed to be the same as that of the subsequent cardboards, so as to ensure that the pattern color effect of the first printed cardboard is consistent with that of the subsequent ones.

Step 4. When the paper feeding is finished, the paper feeding spindle rotates to the customized angle position to trigger the rising, and in turn triggers the inking mechanism of rising printing (one unit) at the starting position of the printing plate (no printing area R), and the inking mechanism is driven by the cylinder The mechanism rises, and the anilox roller separates from the printing plate stuck on the printing plate roller. At this time, the last cardboard just finishes printing and enters the next unit (printing unit 2). Similarly, this unit (printing unit 2) completes printing in the same way as the previous unit, and at the same time triggers the ascending inking mechanism to break away from the printing plate, and controls in sequence until the cardboard completes all printing and triggers the last printing unit The inking mechanism rises away from the printing plate until it stops inking and printing. In this way, the inking effect of the last cardboard is guaranteed to be exactly the same as that of the previous printed cardboard. Since the start and stop of printing production are controlled in sequence according to the above steps, it is ensured that all the cardboard printing patterns in the whole production are printed regardless of the first printing. The first and the last one are of the same quality.

A method of controlling the inking mechanism of the printing unit by the angular position of the paper feeding spindle is suitable for the carton printing machine of the upper printing type, and also suitable for the lower printing type carton printing machine. Below the plate roll, the embossing roll is above the plate roll.

After adopting this technical solution, the beneficial effect of the present invention is: the real-time transmission position of the cardboard can be accurately calculated according to the rotation angle position of the paper feeding spindle during the printing process, and at the same time, the inking mechanism of each printing unit can be precisely controlled on each printing plate. The initial position of the cardboard starts to be inked or detached from the printing plate, so as to ensure that the color of the printed pattern on the front and rear cardboards is consistent, and achieve the purpose of improving the quality of cardboard printing and reducing printing costs.

Description of drawings:

FIG. 1 is a flow chart of a control program of a method for controlling the inking mechanism of a printing unit by using the angular position of the paper feeding spindle in the present invention.

Fig. 2 is a functional block diagram of a method for controlling the inking mechanism of the printing unit by using the angular position of the paper feeding spindle according to the present invention.

FIG. 3 is a schematic diagram of spindle angle triggering of a method for controlling the inking mechanism of a printing unit by using the angular position of the paper feeding spindle according to the present invention.

Fig. 4 is a schematic diagram of a contact model between the anilox roller and the printing plate in a method of controlling the inking mechanism of the printing unit by using the angular position of the paper feeding spindle in the present invention.

Fig. 5 is a schematic diagram of a detachment model of the anilox roller and the printing plate in a method of controlling the inking mechanism of the printing unit by using the angular position of the paper feeding spindle in the present invention.

Fig. 6 is a schematic diagram of a contact model between the bottom printing anilox roller and the printing plate in a method of controlling the inking mechanism of the printing unit by using the angular position of the paper feeding spindle in the present invention.

Specific implementation method:

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1-shown in Fig. 5, a kind of method with the angular position control printing unit inking mechanism of paper feeding spindle, the implementation of the present invention has the following steps:

Step 1: Refer to Figure 2 and Figure 3 to realize the above-mentioned control by using the advantages of high precision and high dynamic response of the servo control system. According to the arc length formula, the distance that the cardboard (4) is transported in the machine is the paper feeding spindle (5) The arc length of the rotation. The absolute distance between each printing unit and the paper feeding unit is converted into the corresponding spindle rotation angle pulse value, and edited into the angle position trigger table in the paper feeding spindle driver, so that each group of customized angle pulse values in the table is related to the cardboard transmission position And the inking position of each printing unit's printing plate is one-to-one, and activate the function of applying the table. Set the output terminal address corresponding to each trigger output inside the servo drive, each output terminal is a control source, connect the control source signal line to the corresponding optocoupler module of the printing unit, and the output connection of the optocoupler module of the printing unit is controlled Solenoid valve in the inking mechanism.

The arc length formula and the calculation formula of the center angle are as follows:

Arc length formula: L=n×π×r/180

The center angle of the paper feeding spindle n=360×L/C

Note: n——The angle of the center of the paper feeding spindle

L——The arc length corresponding to the central angle of the paper feeding spindle

C - the circumference of the printing roller

r - the radius of the printing roller

Step 2: Refer to Figure 1, Figure 2, Figure 3, and Figure 4. The printing production of the machine starts. When the cardboard (4) is transported to the printing position (printing unit 1), the paper feeding spindle (5) also rotates to reach the customized position in the table. (Printing 1) When the position of the falling angle is triggered, the output signal triggers and activates the input signal (POS_SWITCH.1) is on, and when the conditional signal (paper feed enable) is on, the corresponding output signal (P1_A1) is activated immediately Output, the inking mechanism (6) of the printing unit judges whether to execute the control command in combination with the operating conditions (printing enable) of the unit. If the condition signal (printing enable) is on, the control command is executed to trigger the output of the photoelectric coupling module The signal controls the cylinder (8) of this unit to drive the inking mechanism (6) to descend at the starting position (no printing area R) of the printing plate (1), and the anilox roller (7) is stuck on the printing plate roller (2) The printing plate (1) is in contact with ink, as shown in Figure 4. If the conditional signal (printing enable) of this unit is off, the control command for enabling the inking mechanism will not be executed, and it will directly jump to the next unit (printing unit 2) for execution.

Step 3: When the cardboard (4) is conveyed by the printing plate roller (2) and the bottom pressure roller (3) and reaches the printing position of the printing unit 2 at the same time, the paper feeding spindle (5) also rotates to reach the printing position of the printing unit 2 The unit triggers the falling angle position of the inking mechanism (6), and outputs a signal to trigger the activation input signal (POS_SWITCH.2) to be on. At the same time, when the condition chain signal (P1_A1) is on, the corresponding output signal (P2_A1) immediately Activate the output. When the conditional signal (printing enable) of this unit is on, execute this instruction to trigger the output signal of the photoelectric coupling module to control the cylinder (8) of this unit to drive the inking mechanism (6) on the printing plate (1) The initial position (non-printing area R) descends, and the anilox roller (7) is in contact with the printing plate (1) attached to the printing plate roller (2), and the state is also shown in Figure 4. If the conditional signal (printing enable) of this unit is off, it will directly jump to the next unit (printing unit 3) to execute the instruction. Similarly, subsequent printing units also operate according to the above-mentioned steps until the inking mechanism (6) of the last printing unit configured by the machine is triggered to descend to ink. Then, all the unit inking mechanisms (6) participating in the printing will keep working at the inking position after descending, so that the inking amount and pattern color effect of all printed products are consistent regardless of the front and back.

Step 4: See Figure 1, Figure 2, Figure 3, and Figure 5. When the machine stops printing and feeding paper, the last piece of cardboard (4) has just finished printing in the first printing unit and enters the next unit (printing second unit). The paper spindle (5) rotates accurately to the angle position customized in the table (printing one unit) to trigger the rise and break away from the ink, the trigger output signal (POS_SWITCH.1) is off, and the condition signal (paper feed enable) is off , then reset the corresponding output signal (P1_A1) to make it off. Then execute the reset command to reset the output signal of the photoelectric coupling module of the unit (printing 1), so that the inking mechanism (6) of the unit is at the initial position of the printing plate (1) (no printing area R) by the cylinder (8) Drive the inking mechanism (6) to rise, and the anilox roller (7) and the printing plate (1) stuck on the printing plate roller (2) are separated from the ink. As shown in Figure 5.

When the conditional signal (printing enable) of this unit is in the off state, ignore the command and directly jump to the next unit (printing unit 2) to execute the command.

Similarly, when the paper feed main shaft (5) rotates to the angle position where the next unit (printing unit 2) customized in the table is triggered and rises away from the inking angle position, the last cardboard has just finished printing and enters the next unit ( Print three units), the trigger output signal (POS_SWITCH.2) is off, and at the same time the chain condition signal (P1_A1) is off, then reset the corresponding output signal (P2_A1) to make it off. And execute the reset command to reset the output signal of the photoelectric coupling module of the printing unit, so that the inking mechanism of the unit rises from the initial position of the printing plate (no printing area R) and leaves the ink. If the conditional signal (printing enable) of this unit is off, ignore the command and jump directly to the next unit (printing unit 3) to execute the command.

By analogy, subsequent printing units also operate according to the above-mentioned resetting steps, until the inking mechanism (6) of the last printing unit configured by the machine is triggered to rise and break away from inking. Here, the real-time conveying position of the cardboard is accurately calculated according to the rotation angle position of the paper feeding spindle, and at the same time, the inking mechanism (6) of each printing unit is precisely controlled to start inking at the starting position of the respective printing plate or to leave the inking control of the printing plate Under the method, each printing production can ensure that the pattern color and effect of the cardboard are always consistent, so as to achieve the purpose of improving the printing quality of the cardboard, production efficiency and reducing costs.

A method of controlling the inking mechanism of the printing unit by the angular position of the paper feeding spindle is applicable to the carton printing machine of the upper printing form, and also applicable to the lower printing carton printing machine. When the lower printing form is used, the anilox roller (7 ) is below the printing plate roller (2), and the embossing roller (3) is above the printing plate roller (2) (as shown in Figure 6).

The above is only a preferred embodiment of the present invention to control the inking mechanism of the printing unit by the rotation angle position of the paper feeding spindle, and is not intended to limit the application method of the present invention in any form. Anyone familiar with those skilled in the art, without departing from the present invention: under the similar situation of the method for controlling the printing unit inking mechanism with the rotational angle position of the paper-feeding main shaft, all can use the paper-feeding main shaft of the present invention in the method disclosed above and the technology The method of controlling the inking mechanism of the printing unit by rotating the angular position makes many possible changes and modifications, or is modified into an equivalent embodiment with equivalent changes. Therefore, all the equivalent changes that do not depart from the content of the present invention, the shape, structure and principle of the method of controlling the ink mechanism of the printing unit with the rotational angle position of the paper feeding spindle according to the present invention should be covered by the paper feeding method of the present invention. The method for controlling the inking mechanism of the printing unit by the rotational angle position of the main shaft is within the scope of protection.

Claims (3)

1. A method for controlling the inking mechanism of a printing unit by using the angular position of the paper-feeding spindle, comprising: a paper-feeding servo driver module and an optocoupler conversion module. 2. the realization step of control method of the present invention: Step 1. The present invention utilizes the advantages of high precision and high dynamic response of the servo control system to realize the above-mentioned control, and pre-calculates the angle pulse value corresponding to the inking position of each printing unit according to the arc length formula and the circle center angle calculation formula, and each group The customized angular pulse value corresponds to the position of the carton transport and the inking position of the printing plate of each printing unit. Then edit these pulse values in the angle position trigger function table of the servo driver module of the paper feeding spindle, and set the output terminal address corresponding to the trigger output, and connect the output terminal to the optocoupler conversion module of each corresponding printing unit, the optocoupler The conversion module is wired to control the cylinder solenoid valve of the unit's inking mechanism. Step 2. When the paper feeding starts, the first cardboard is sent out from the zero point (0°) of the paper feeding spindle, and when it reaches the printing position of the first printing unit, the starting position of the printing plate on the printing cylinder at this time ( The non-printing area R) is also rotating to the position area in contact with the anilox roller, and at the same time, the paper feeding spindle just rotates to the trigger angle position corresponding to the unit, and triggers the inking mechanism of the unit to be at the starting position of the printing plate (no printing Area R) begins to drop contact inking. Step 3. When the paper feeding spindle continues to rotate to the customized triggering angle corresponding to the next unit (printing unit 2), the inking mechanism of the printing unit will be triggered in sequence according to the above method to be at the starting position of the printing plate (no printing area R) Driven by the cylinder, it begins to descend, and the anilox roller contacts the printing plate attached to the printing plate roller for inking, until the inking mechanism of the last printing unit that triggers the completion of the machine configuration is lowered, and all the inking mechanisms of the printing units are descending After that, it will keep working at the inking position, so that the amount of ink on the first cardboard is guaranteed to be the same as that of the subsequent cardboards, so as to ensure that the pattern color effect of the first printed cardboard is consistent with that of the subsequent ones. Step 4. When the paper feeding is finished, the paper feeding spindle rotates to the customized angle position to trigger the rising, and in turn triggers the inking mechanism of rising printing (one unit) at the starting position of the printing plate (no printing area R), and the inking mechanism is driven by the cylinder The mechanism rises, and the anilox roller separates from the printing plate stuck on the printing plate roller. At this time, the last cardboard just finishes printing and enters the next unit (printing unit 2). Similarly, this unit (printing unit 2) completes printing in the same way as the previous unit, and at the same time triggers the ascending inking mechanism to break away from the printing plate, and controls in sequence until the cardboard completes all printing and triggers the last printing unit The inking mechanism rises away from the printing plate until it stops inking and printing. In this way, the inking effect of the last cardboard is guaranteed to be exactly the same as that of the previous printed cardboard. Since the start and stop of printing production are controlled in sequence according to the above steps, it is ensured that all the cardboard printing patterns in the whole production are printed regardless of the first printing. The first and the last one are of the same quality. 3. A method of controlling the inking mechanism of the printing unit with the angular position of the paper feeding spindle according to claim 1 is applicable to the carton printing machine of the upper printing form, and is also applicable to the lower printing carton printing machine. In the printing form, the anilox roller is below the printing plate roller, and the embossing roller is above the printing plate roller.

Images