A tension control method on printing equipment

Abstract

The present invention discloses a tension control method on a printing device. The method adopts a new speed adjustment mode. When the device accelerates or decelerates, the influence of acceleration or deceleration and material expansion or contraction is fully considered, and the accuracy of overprinting is more finely controlled. Such treatment can effectively reduce waste, improve the performance of the printing press, effectively reduce the tension fluctuation of the printing press when the speed is increased or decreased, and reduce the adverse effect on the printing process; improve the qualified rate of printed products; thereby improving the performance of the equipment and reducing the total cost of equipment use.

Description

Technical Field

[0001] The invention belongs to the technical field of printing equipment and relates to a tension control method on printing equipment. Background Art

[0002] Tension stability is very important for printing effects, and it can even be said to determine the final quality of the finished product. When the machine is running, it needs to overcome the effects of acceleration and deceleration and material expansion and contraction to complete the printing process. When the machine speeds up from a standstill to the highest speed, a large amount of waste will always be generated. Therefore, it is very important to improve tension stability and reduce tension fluctuations.

[0003] However, under the existing technology, the tension control is often unstable during the printing process of the printing press due to the influence of the speed increase and decrease and the expansion and contraction of the printing material, which in turn affects the quality of the printed product. Therefore, during the speed increase and decrease process, the best way is to eliminate the influence of the above factors. In this way, the tension control under acceleration and deceleration conditions can be solved, effectively reducing the generation of waste and reducing the cost of machine use. Summary of the invention

[0004] The purpose of the present invention is to provide a tension control method for printing equipment, which solves the problem of inaccurate registration caused by unstable tension during the process of starting up and speeding up in the prior art.

[0005] The technical solution adopted by the present invention is a tension control method on a printing device, which specifically controls the tension of the printing material by controlling the speed of the plate roller motor, and the speed of the plate roller motor satisfies the following formula (1):

[0006] (1)

[0007] In the formula, v represents the speed of the machine, K represents the material expansion coefficient, N represents the transmission ratio from the motor to the plate roller, L represents the plate circumference, Ω represents the plate roller motor speed, and ω0 represents the host speed.

[0008] The present invention is also characterized in that:

[0009] The speed of the plate roller motor is specifically calculated according to the following steps: when the printing press is accelerated or decelerated, the adjustment amount of the printing press is obtained through the real-time printing speed;

[0010] The adjustment of the printing press, i.e. the plate roller motor speed Ω, is specifically implemented according to formula (2):

[0011] Ω=ω0+ω2(2)

[0012] Where, the angular velocity of the motor is ω2, and the speed of the host is ω0;

[0013] The adjustment amount of the printing press is calculated according to the following steps: The acceleration is calculated as follows:

[0014] (3)

[0015] Multiply the acceleration by the printing speed to get the intermediate quantity temp1:

[0016] temp1 = v * b (4)

[0017] Add the intermediate variable temp1 to the natural logarithm of the expansion coefficient K of the printed material to obtain the intermediate variable Temp2:

[0018] Temp2=temp1+lnK(5)

[0019] Divide the intermediate variable Temp2 by the circumference of the printing plate roller L to obtain the angular velocity ω of the plate roller:

[0020] (6)

[0021] Multiply the angular velocity of the printing plate roller by the motor transmission ratio N to obtain the angular velocity ω2 of the motor:

[0022] (7)

[0023] The angular velocity ω2 is added to the host speed ω0, and the speed Ω during acceleration and deceleration is finally achieved:

[0024] (8).

[0025] The expansion coefficient K ranges from 2 to 100.

[0026] The beneficial effects of the present invention are

[0027] The tension control method on a printing device of the present invention changes the disadvantage of unstable tension when the printing machine accelerates and decelerates in the past. During the printing process, the printing material is dried and heated, and the force between its molecules is weakened. At this time, if the influence of acceleration and deceleration factors is added, the printing material will be stretched. Therefore, how to reduce the material expansion and contraction amount and the influence of acceleration and deceleration has become a difficult problem to be solved urgently. Adjusting the speed of the plate roller motor to compensate for the expansion and contraction rate has become the most effective way to reduce the expansion and contraction amount. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The tension control method on a printing device of the present invention adopts a new speed adjustment mode, fully considers the influence of acceleration and deceleration and material expansion and contraction when the device accelerates and decelerates, and more finely controls the accuracy of overprinting; such treatment can effectively reduce waste, improve the performance of the printing machine, effectively reduce the tension fluctuation of the printing machine when the speed is increased or decreased, reduce the adverse effect on the printing process, and improve the qualified rate of printed products; thereby improving the performance of the equipment and reducing the total cost of equipment use;

[0030] The present invention provides a tension control method on a printing device, which specifically controls the tension of a printing material by controlling the speed of a plate roller motor, wherein the speed of the plate roller motor satisfies the following formula (1):

[0031] (1)

[0032] In the formula, v represents the speed of the machine, K represents the material expansion coefficient, N represents the transmission ratio from the motor to the plate roller, L represents the plate circumference, Ω represents the plate roller motor speed, and ω0 represents the host speed.

[0033] The speed of the plate roller motor is calculated according to the following steps: When the printing press is accelerating or decelerating, the adjustment amount of the printing press is obtained through the real-time printing speed. The adjustment of the printing press, i.e. the speed of the plate roller motor Ω, is specifically implemented according to formula (2):

[0034] Ω=ω0+ω2(2)

[0035] Where, the angular velocity of the motor is ω2, and the speed of the host is ω0;

[0036] The acceleration is calculated as follows:

[0037] (3)

[0038] Multiply the acceleration by the printing speed to get the intermediate quantity temp1:

[0039] temp1 = v * b (4)

[0040] Add the intermediate variable temp1 to the natural logarithm of the expansion coefficient K of the printed material to obtain the intermediate variable Temp2:

[0041] Temp2=temp1+lnK(5)

[0042] The expansion coefficient is 2~100, which is selected according to the different printing materials; in general, the expansion coefficient is selected between 2 and 100;

[0043] The specific principle is that the more elastic the material, the larger the expansion coefficient. Generally speaking, the expansion coefficient of plastic film is greater than that of paper.

[0044] Divide the intermediate variable Temp2 by the circumference of the printing plate roller L to obtain the angular velocity ω of the plate roller:

[0045] (6)

[0046] Multiply the angular velocity of the printing plate roller by the motor transmission ratio N to obtain the angular velocity ω2 of the motor:

[0047] (7)

[0048] The angular velocity ω2 is added to the host speed ω0, and the speed Ω during acceleration and deceleration is finally achieved:

[0049] (8)

[0050] The tension control method on a printing device of the present invention controls the tension of printing materials by changing the speed, thereby reducing the generation of a large number of waste products and reducing waste.

Claims

1. A tension control method on a printing device, characterized in that: Specifically, the tension of the printing material is controlled by controlling the speed of the plate roller motor, and the speed of the plate roller motor satisfies the following formula (1): （1） In the formula, v represents the speed of the machine, K represents the material expansion coefficient, N represents the transmission ratio from the motor to the plate roller, L represents the plate circumference, Ω represents the plate roller motor speed, and ω0 represents the host speed; The rotation speed of the plate roller motor is specifically calculated according to the following steps: when the printing press is accelerated or decelerated, the adjustment amount of the printing press is obtained through the real-time printing speed.

2. A tension control method on a printing device according to claim 1, characterized in that: The adjustment of the printing press, i.e. the plate roller motor speed Ω, is specifically implemented according to formula (2): Ω=ω0+ω2(2) Where, the angular velocity of the motor is ω2, and the speed of the host is ω0.

3. A tension control method on a printing device according to claim 2, characterized in that: The adjustment amount of the printing press is specifically calculated according to the following steps: The acceleration is calculated as follows: （3） Multiply the acceleration by the printing speed to get the intermediate quantity temp1: temp1 = v * b (4) Add the intermediate variable temp1 to the natural logarithm of the expansion coefficient K of the printed material to obtain the intermediate variable Temp2: Temp2=temp1+lnK(5) Divide the intermediate variable Temp2 by the circumference of the printing plate roller L to obtain the angular velocity ω of the plate roller: （6） Multiply the angular velocity of the printing plate roller by the motor transmission ratio N to obtain the angular velocity ω2 of the motor: （7） The angular velocity ω2 is added to the host speed ω0, and the speed Ω during acceleration and deceleration is finally achieved: （8）。 4. A tension control method on a printing device according to claim 3, characterized in that: The expansion coefficient K is 2-100.

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