SU1219416A1 - Remote control system for feeding ink to printing presses - Google Patents

Abstract

An ink zone remote adjustment system for a printing machine comprises ductor knife support elements acting on ductor knife and equipped with actuating systems (1) comprising adjustment drives (2) and position measurement transmitters (3). The adjustment system further comprises a control section, which comprises one or more converter systems, a control system (9) operating in the actuation process for assimilating the discontinuous path of the positions of the support elements to the continuous function of the ductor knife flexion line when predetermined limiting values are exceeded, and a summating unit (11). The control system (9) comprises a manually actuatable triggering unit, a sequence control starting in a non- repetitive cycle from an end one of the actuating systems (1), interrogating the position measurement transmitters (3) and switching on the adjustment drives (2), a difference former which compares the difference between two adjacent actuating systems (2), and a computing unit which computes the actuation values for the adjustment drives (2) of adjacent actuating systems and of those adjoining actuating systems on both sides. <IMAGE>

Description

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The invention relates to ink supply control devices in ne 4aTiibix machines.

A paint dosage device is known, consisting of one or no. how many systems of recalculation of densitometric parameters into control actions and control system operating in the executive process for matching the discrete pattern of the positions of the support elements of the paint knife with the continuous function of the fold line of the paint knife when the specified limit values are exceeded (US Patent No. 3835777, cl. B 41 C 7/08, 1974).

The matching is performed across the entire range, the matching algorithm covers all the actual positions, arranges them in an incremental or descending sequence of all differences, and processes all jump points in turn. In this case, a single reuse processing of a single jump and a multiple run of the matching system are performed. The matching process is carried out automatically with each change of the actuator installation.

The disadvantage of the device is that coordination can only be done with a computer,

The aim of the invention is to provide a control device for remotely controlling ink supply with a simple design and low manufacturing costs with minimal processing costs.

FIG. 1 shows a functional diagram of the system of remote control of paint supply; in fig. 2 - functional diagram of the control device; in fig. 3 - the principle of matching with the supporting elements of the colorful knife.

The system of remote control of ink supply has actuating systems i, the number of which corresponds to the number of supporting elements of the ink knife. Actuator system 1 consists of a servo drive 2, which changes the position of the support elements of the colorful knife, and the position measuring sensor 3, which takes into account the position of the basic elements of the colorful knife and / or the colorful knife. The latter is located in the tank. Servo 162 output

the drive 2 is connected to the position measuring sensor 3 and the printmaking unit 4 of the printing press (the last is understood to be the printing section with inks and wetting devices, as well as offset, printing and printing cylinders).

At the exit of the imprint formation unit 4, there is a finished edition,

measured by densitometry: the densitometric parameters are recalculated in the computing unit to the measured values of A and are fed to the control unit 9 using the first wiring system 7.

The measured values B at the output of the position measuring sensor 3 are supplied by a second system 8 wires to the control unit 9, which gives out control values that by means of the third system 10 wires and summing unit 1 again enter the executive system 1. Second input of the summing unit 11 is connected to a computing unit 12 in which the specified densitometric values are entered.

The number of sections with functional groups of the computing unit 12, the summing unit 11 and the executive system corresponds to the number of colorful supporting elements, and the number of sections with knots

The fingerprints 4 and the computational unit 6 depend on the features of the operation of the printing press (in FIG. 1, one is shown in one section). The control device 9, there is

only one in the remote paint control system, but shown with a large number of signal wires for measured values A or measured values B and

control actions corresponding to the number of colorful supporting elements or the configuration of the section of the fingerprint formation unit 4 and the computing unit 6.

The control unit 9 (Fig. 2) contains a software control unit 14 connected to a switch 13. The first 7 or second 8 wire system is connected to the input of the node 14 connected to the difference driver 15 and to two adjacent position sensors 3. The output of the difference generator 15 is connected to the arithmetic circuit 16, which is connected by an output through node 14 to each two adjacent and adjoining actuators 2 to each other.

FIG. Figure 3 shows a part of the system of remote control of the paint supply with the supporting elements of the paint knife 17.1-17.6, their initial position before matching 17.G - 17.6, their positions after matching NIN 17.l -17.6 supporting position 18 of all the colorful supporting elements 17.

The system works as follows.

The computational unit 12, as a result of measuring test, sample and drawing prints, as well as recalculating printing technical parameters, such as ink density, electrical signals, which, using the summing unit 11, reach the actuator system 1 and cause the support elements colorful knife. The printer can, based on observation and experience, enter the parameters directly into the summing unit 11. The change in the position of the supporting elements of the inking knife or the inking knife is taken into account by the positioning sensor 3 of the executive system 1, which gives measured values of B. This change in the positions of the supporting elements of the inking knife has the impact with the help of knots 4 of the formation of imprints on the imprint 5 and can also be measured with the help of the first system 6 of recalculation and converted into measured values A.

The measured values A or B fall into the control unit 9, the task of which is to match the discrete position of the support elements of the colorful knife with the continuous function of the knife fold line when certain limit values are exceeded. This alignment is necessary in order to avoid such differences in position between the colorful knife and the supporting elements of the colorful knife, which cause the raising of the colorful knife from these supporting elements. To do this, the node calculates the control actions according to the specified laws and, accordingly, the measured value A or B. The control action for coordination in terms of

The second block 1 1 gets to the executive system 1, which causes the corresponding adjustment of the supporting elements 17 of the paint knife.

The control unit 9 is turned on by a manually controlled switch 13 during the execution process, communicating 1m with the program control unit 14. Thus, the software control unit 14 submits to the printer. With small corrections, it may not perform a matching cycle, since there is no danger of exceeding the boundary values. Thus, it is possible, in spite of the danger of exceeding the boundary values, to deliberately abandon the matching cycle, if this is indeed an improvement in print quality.

After issuing the command, the software control unit 14 begins a one-time cycle from one of the extreme execution systems, which sequentially passes to the opposite extreme execution system. Multiple repetitions of the cycle are deliberately denied, since theoretically achievable higher accuracy is imperceptible in practice, and the complexity and costs when negotiating for this account are significantly reduced.

When matching, two adjacent measured values A or B are polled and checked in the shaper 15 for the difference to exceed a certain limit value. If there is no overshoot, node 14 polls the following two adjacent values of A or B.

If the boundary value is exceeded, in arithmetic circuit 16 the position of two adjacent as well as two actuators adjacent on both sides is calculated.

Through node 14, the set values determined in the arithmetic scheme I6 are output through the adder 11 and the corresponding setting bodies are connected to correct the adjacent and adjacent setting bodies. By attracting the setting values adjacent on both sides, a higher accuracy is achieved in the matching cycle than in the correction only exceeding the set value limits.

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The functions of the control unit 9 can be performed by a programmed microcomputer, which also performs other functions of the print engine. In addition, the functions of the computing units 12 can be performed on the micro-breeding machine.

The supporting elements 17.1-17.6 of the colorful knife have a joint supporting position 18, relative to which they have the same position 17.1 -17.b before agreement. When comparing the adjacent support elements 17.3 and 17.4 of the colorful knife, the difference in positions 17.3 and 17.4 of the supporting elements of the colorful knife exceeds 17, 3 and 17.4 of the specified maximum limit values.

Negotiation becomes necessary. It occurs in sections using a linear function (right), the slope of which (Fig. 3) depends on

166

the differences of the adjacent supporting elements 17.3 and 17.4 of the colorful knife.

According to the described functions, the matching knife for the adjacent supporting elements 17.3 and 17.4 of the colorful knife, as well as the subsequent adjacent on both sides of the supporting elements 17.2 and 17.5 of the colorful knife, are coordinated to the new coordinated half-rounds.

In the example of FIG. Figure 3 shows the alignment for sections with a linear function, non-linear also can be used for matching.

functions In this case, the approval can be carried out both by sections and over the entire range. One of. suitable functions for such problems is the approximating Newton polynomial,

pivot points which learn

all or only part of the positions of the supporting elements of colorful leather.

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Order 1207/24 Circulation 361Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, ud. Project, 4

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Claims (2)

D. SYSTEM OF REMOTE CONTROL OF THE SUPPLY OF PAINT FOR PRINTING MACHINES, comprising an input control unit associated with the first output of the executive body, and a fingerprint forming unit, characterized in that it has computing units and a summing unit, the inputs of which are connected to the outputs of the first computing unit and unit control, the input of which is connected through the second computing unit and the imprinting unit with the second output of the executive body, the input associated with the output of the summing unit. 2. The system of pop. ^ characterized in that the input control unit comprises a software control unit, a difference forming device, a computing unit and a switch connected with an input of the program control unit of the first outputs connected via the difference forming device and an arithmetic device with second outputs of the program control unit. Fig.] Ί 12