On the standardization process of printing and prepress technology (1)

The FM1450 machine is a machine that combines and glues two pieces of paper together. The bottom paper used is a single-faced corrugated paperboard. The front paper is a color printing paper. Through the transportation, gluing, compounding and pasting of bottom paper and face paper, the composite corrugated paperboard not only has higher strength, but also has a more eye-catching and beautiful pattern. It is a new type of high-precision, high-efficiency equipment that continuously produces high-quality color printing paper boxes.

In the synchronous conveying process of the paper and the bottom paper, the relative position of the two is a direct factor that affects the accuracy of the paperboard composite. The face paper is composed of a motor, a paper feeding board and a paper conveying rack. The bottom paper is conveyed by the lower channel chain composed of an auxiliary suction belt and a conveying frame. The phase difference between the upper and lower passages of the paper is passed through the composite sleeve. The misalignment of the paper and the bottom paper is formed, which is called the overlay accuracy of the paperboard.

In the theoretical design, the upper and lower channels are absolutely synchronous and absolutely in phase. Because parts have manufacturing tolerances in the tolerance range, such as gears, timing pulleys, sprockets, timing belts, and chains, a series of transmission chain constituents There are deviations, and the static phase correction can be done after the whole machine is installed. However, after starting up, these deviations accumulate periodically, causing a dynamic phase difference of the paper. For this purpose, a digital phase adjustment system was designed on the FMl450 type cladding machine and a utility model patent was obtained, patent number ZL0322842.6. The phase adjustment device is composed of a differential gear, a differential motor, and an electric control system. .

A control unit, an electronic control system, is mounted on the tissue conveyor, which includes a controller, a display and numerical keys. The display and operation interface of the control unit can be set in the central electric control cabinet, or can be set on the unit to detect the quality of the finished product sampling point.

The principle of the execution unit is based on the differential mechanism composed of harmonic gears. The main components of the harmonic gear transmission are only three harmonic generators, active rigid wheels and driven flexible wheels, which constitute a differential transmission mechanism. It is a digital phase adjustment device of the FM1450 type cladding machine. In the on state, when the composite paper and the bottom paper are found to be misaligned, the adjustment motor is started, the generator shaft is driven by the large and small timing pulleys, and the harmonic gear differential mechanism works, and the speed ratio between the upper and lower channels is activated. Slightly greater than (or less than) 1, that is, the additional differential speed ratio of about ±O.003 is imposed on the isochronous transporting movement to form the differential between the upper and lower channel chain rows to realize the phase adjustment of the surface paper transport and the bottom paper transport. When the desired target is reached, close the adjustment motor and try to lock the wave generator shaft. Harmonic gear differential mechanism does not work. The speed ratio between the upper and lower channels is equal to l, and the paper conveying and bottom paper conveying are maintained. Run synchronously.

In this patent design scheme, two-phase hybrid stepper motors (with a l:10 reduction gearbox) are used to adjust the motor. Electrical pulses are supplied from a dedicated power supply. Each pulse is input to the power supply, and the motor is advanced. The angular displacement is equal to The number of pulses is proportional, the speed is proportional to the pulse frequency, and can be varied in a wide range by varying the pulse frequency, enabling quick start, reversal, and braking, and the self-locking ability of a phase winding with long-term power. The adjustment motor has the characteristics of high adjustment accuracy and fast transmission speed. The control system uses the Meag 128M CO controller as the control core, including a numeric keypad, 5-inch LCD, a speed sensor, Count sensorl, and stepper drive motor.

When turned on normally, the LCD screen shows the current speed of the machine and the total number of pages opened. When there is an error between the backing paper and the facial paper, press the setup button to enter the screen for setting and adjusting the backing paper, and input the error value that you want to eliminate. After the keyboard is input, the internal Meagl28 MCO will input the value according to the prior The set algorithm converts the frequency and number of input pulses. Because Meagl28 operates extremely fast, the fastest is 12 million instructions/s, so when the keyboard value is input from the outside, the motor will immediately start and adjust in place, thus ensuring that the second error is reduced to within the allowable range. When the motor stops, the stepper motor has a static force distance (ie, a torque when the motor is stationary when the motor is stationary). The moment has been precisely calculated at design time to ensure that the motor is stationary when there is no pulse output and will not be driven by the load.

When the composite paper and bottom paper are found to be misaligned, observe the cardboard misalignment amount, estimate the linear displacement value L (unit: mm) that needs to be adjusted, press the key to input the target value L, and the controller converts the target value into the number of pulses. N, then send a pulse number N to the stepper motor, drive the wave generator shaft in the harmonic wave differential mechanism to rotate through the corresponding angular displacement θ, and the driven flexible wheel outputs the differential rotation angle to drive the lower channel chain to synchronize The differential motion is superimposed on the speed, and the linear displacement amount is equal to the originally input target value L. Within the range of the load capacity, the stepping motor will not desynchronize with the change of the power supply voltage, load, and environmental conditions, so the open-loop control can Ensure that the displacement value output by the phase adjustment device is equal to the input target value.

Research institutions, industry associations, suppliers, and customers try to define different standards with different interests. However, the history of true standardization began in 1970 with the Bruner system, and almost only the Bruner system was standardized. The reason is that the Brunel system is the most steadfast in its commitment to the study of printing methods in printing technology.

1 Outline of the standardization process

Before the parameters affecting quality are standardized, the control of print quality must be very general. Determining these impact parameters sounds like a cliché, but it is not. After affecting the parameters into people's hearts, people began to realize its importance to the printing results. The position of different influencing parameters in printing is not the same. For example, dot gain is more important than the density of the field. The next step is to separate different influencing parameters, for example, to distinguish mechanical dot extensions from visual dot gains. Another important step is that the influence parameters can be measured. That is, appropriate measurement methods are used when it is not necessary to modify the developed or existing influence parameters, which are mostly matched with ready-made conforming measuring instruments.

The development of suitable measuring elements is considered to be one of the most effective methods. These measuring elements of Bruner's system have been and are also particularly effective. Through such measurements, relevant data can be calculated. For example, dot coverage can be calculated from the density of the ground and the density of the dot area. Calculated measurements should be clearly organized to facilitate better comparison and analysis. In the discussion of the results, whether it is good or bad, right or wrong, the problem will surface sooner or later. So who has the right to answer this question? Is it the printer, the business leader or the customer? The only one who can answer these questions is the one who has already been practiced. Well-known industry standards. The European standard in Bruner's system is one of them.

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