JP3210015B2 - Device for controlling and / or controlling the individual adjusting elements provided in the area of the delivery device of the printing press - Google Patents

Abstract

A special eye must be kept on the laying of the sheet on the delivery stack, especially in the range of high machine speeds. The purpose of the present invention is to propose a device for controlling and/or regulating the setting elements in the sheet delivery region of a sheet printing machine. The settings of the setting elements of the sheet delivery are calculated with reference to characteristics specific to the paper and printing machine in such a way that the sheet being placed on top of the sheet stack is virtually stationary.

Description

The present invention relates to a device for controlling and / or controlling individual adjusting elements provided in the area of a sheet ejection device of a sheet-fed printing press. At least one input device for inputting the characteristic data of the printer and the characteristic data unique to the printing press, at least one arithmetic unit for continuously using the characteristic data, and a control device. However, the present invention relates to a type in which the adjustment 9 relating to the paper size is performed based on the input characteristic data in the individual adjustment elements.

DE-A 34 13 179 discloses a control and control device which is used in a delivery device of a sheet-fed printing press. Via at least one input device, the sheet size, the paper weight and the machine speed are input to the computing device. Adjustments related to size are made in response to the input data. Furthermore, the adjustment of the gripper opening cam or the adjustment of the suction roller, for example, is carried out in accordance with the desired values which are determined empirically for each operating state and are stored in the form of characteristic curves in the memory element.

Disadvantages of such means include the following. That is, it is extremely troublesome to obtain each adjustment data empirically in relation to the values of the paper weight and the number of rotations. Moreover, the determination of such a characteristic curve group must be performed by a skilled person. Furthermore, storing the characteristic curve group also requires a high memory capacity.

Furthermore, a problem arises because the characteristic curve group does not have a continuous characteristic curve. Instead, measurements are performed at some fixed parameter combination.
The measured values are subsequently determined by interpolation. Furthermore, in the configuration described in DE-A 34 13 179, the individual adjustment values can be corrected by the printing press in order to optimize the sheet ejection, which means that This results in a discontinuity in the characteristic curve.

Starting from the known prior art, the object of the present invention is to provide such a sheet-feeding device in which the adjustment values of the adjusting elements of the delivery device are defined using the paper-specific characteristic data and the printer-specific characteristic data. SUMMARY OF THE INVENTION It is an object of the invention to provide a device for controlling and / or controlling an adjusting element provided in the area of the sheet ejection device of a sheet printing press.

In order to solve this problem, in the configuration of the present invention, the arithmetic device calculates the energy of the sheet reaching the sheet discharging device based on the characteristic data, and the energy is calculated according to the calculated energy value. An arithmetic unit defines control values for the suction roller and / or the gripper opening cam and / or the blow nozzle provided above the stack, so that the energy removal performed by the adjusting element is located at the delivery device. The control device controls the suction roller and / or the gripper opening cam and / or the blow nozzle above the stack according to the calculated value. Controlled.

In an advantageous embodiment of the method according to the present invention, computing device, wherein ^{F = m * v 2/2} * μ * s ( although, m represents the mass of the sheet, v is sheet reaching the sheet discharge device Represents the speed of the paper, μ represents the coefficient of friction, and s represents the length of the paper on which the attraction force of the attraction roller acts.), The attraction force of the attraction roller is calculated. When the length of paper on which the suction force of the suction roller acts is constant, that is, when the adjustment of the gripper opening cam is fixed, the suction force F of the suction roller is the square of the speed of the sheet reaching the sheet discharging device. Changes in relation to

In another refinement type of the method according to the present invention, when the maximum suction force F _max of the suction roller has been achieved, the control device changing the gripper opening cam, in this case, equation ^{s = m * v 2/2} * μ * The paper length on which the suction force of the suction roller acts can be changed by _Fmax .

In a further embodiment of the device according to the invention, the computing device has a function, in relation to the energy of the sheet reaching the delivery,
By the equation ^{s = m * v 2/2} * μ * F, it is adapted to calculate the paper length is s acting in the suction force of the suction roller. If the adjustment limit value of the maximum possible paper length is s _max that suction force of the suction roller acts is achieved, computing device, by the equation ^{F = m * v 2/2} * μ * s max, the suction roller Is calculated.

Usually, the method is carried out as the suction force is calculated according to the formula ^{F = m * v 2/2} * μ * s. In this case, s is first kept constant. When adjusting s, it is taken into account that the longer the sheet is guided by the gripper, ie, the shorter s, the better the stacking of the sheet. Therefore, only in exceptional cases, correction of sheet discharge is performed by changing the sheet length on which the suction force of the suction roller acts.

In a further embodiment of the device according to the invention, the computing device is provided with an input device for providing information on the application of each ink, lacquer, dampening solution and / or powder on the sheet; The arithmetic unit calculates the increase in mass,
This is taken into account when calculating the energy of the sheet reaching the sheet ejection device. For example, information on the amount of ink applied to a sheet can be obtained from the position of the ink slider. Also, lacquer application, dampening solution application and / or powder application on the sheet can be detected without problems.

Alternatively or additionally, an input device is provided for the printer to input a correction factor k for influencing the suction force F of the suction roller or the paper length s on which the suction force of the suction roller acts. ing. In this way, for example, if the initial calculation program does not take into account the increase in mass due to ink application, lacquer application, dampening solution application or powder application, the printing technician can correct the suction force of the suction roller or correct the gripper opening cam. The possibility is given that the sheet pile can be influenced.

In yet another configuration of the present invention, the correction factor k inputted by the pressman is adapted to be taken into account when calculating the calculation time or paper length s of the attracting force F of the suction roller, the suction force F _max The correction factor is used for calculating the paper length s or for calculating the suction force F when the adjustment limit value is achieved or when the maximum paper length s _max is achieved. The use of a correction factor has the advantage that the correction is valid over the entire speed range. As a result, discontinuities do not occur in the adjustment values of the adjusting element.

In this case, an OK adjustment associated with the prescribed parameter, that is, a final appropriate adjustment is generated. It is advantageous if the found correction factor k is stored in the memory of the computing device at the end of printing. The stored value is automatically used as the set value in the next printing with the same parameters, so that no new correction of the adjustment of the suction roller or the adjustment of the gripper opening cam is necessary or only slightly necessary. do not become.

In a further embodiment of the method according to the invention, the control device controls the powder application device such that the amount of powder applied per unit area in relation to the printing press speed is constant. Furthermore, the arithmetic unit calculates the amount of powder applied to the sheet in relation to the final pile height. That is, for example, the amount of powder applied to the sheet may decrease linearly from the lower edge of the stack to the upper edge of the stack. Since the pressure applied to the lower group of sheets is much higher than the pressure applied to the upper group of sheets, this avoids bonding of the sheets in the lower area of the stack.

In a further embodiment of the device according to the invention, the control device can be supplied with data on the mass distribution of the printed sheet via an input device, and the mass of the sheet over the entire surface of the sheet. The control device controls the blow nozzle such that a pressure distribution related to the distribution is formed.

Since the blow nozzle is controlled by the control device in such a way that the pressure distribution corresponds to the actual surface mass distribution of the sheet, the sheet can be accurately and quickly unloaded. In some cases, it is advantageous to adjust the blow nozzle so that the sheet is first lowered in the middle of the sheet based on the pressure distribution. However, it is also possible to carry out the stacking so that the air flows rapidly under the sheet, outwardly, starting from the point where it is initially lowered, which is generally located off-center. In other words, the blow-air nozzle acting on the sheet from above can be assisted by a suction device, which is possibly arranged on the side of the stack.

When data relating to paper thickness, ink application, powder application and / or lacquer application is supplied to the computing device, the surface mass distribution can be accurately defined by the computing device.
For example, information about the ink distribution can be determined via the position of the ink zone screw. Also, the surface of the sheet is decomposed into matrix-like surface elements to determine the mass distribution, and the ink, lacquer, fountain solution and powder obtained by subtracting the evaporation amount and powder loss together with the paper weight for the surface elements. Advantageously, the mass is determined. In this case, a device for measuring the weight of the pile before and after printing may be provided as an auxiliary device. The adjustment of the pressure distribution corresponding to the mass distribution by the blow nozzle can be carried out in various ways in relation to the construction. That is, the amount of blown air, the number of connected blow nozzles and the direction of the blowing action can be varied in relation to known data specific to the sheet and the printing press.

Structurally, it is advantageous if a blow-air device is provided above the stack of paper, the blow-air device having air outlet nozzles distributed in a matrix over the entire surface of the sheet. In this case, blow air is individually supplied to the nozzles by a control device. This makes it possible for the nozzles acting on the area to be initially lowered on the sheet to generate blow air earlier than for the remaining nozzles. For example, the nozzles are blocked in rows starting from the trailing edge and towards the leading edge.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a side view of the delivery area of a sheet-fed rotary printing press, and FIG. 2 shows a schematic diagram of the values achievable by the method according to the invention.

FIG. 1 shows a side view of a sheet discharging device 1 of a sheet-fed rotary printing press (not shown). The chain 2 having the gripper bridge 3 runs around the turning vehicles 4 and 5. The gripper bridge 3 transports the sheet 6 in the direction of the stack 7. As soon as the sheet 6 is released from the gripper bridge 3 on the stack 7, the braking of the sheet 6 via the suction roller 9 takes place. The gripper bridge 3 is controlled via a gripper release cam 10. The pushing down of the sheet 6 onto the stack 7 is effected by a blow nozzle 11.

The sticking of the sheet 6 to the stack 7 is ideally such that the kinetic energy of the sheet 6 is at least considerably smaller when the sheet 6 reaches the trailing edge of the stack 7. It is preferable that the braking force F of the suction roller 9 and the effective braking section s be set. This prevents the sheet from hitting the stacking stop 8 too hard and causing damage to the sheet 6.

In the configuration of the present invention, the suction roller 9 and / or the gripper opening cam 10 are set so that such a condition is always satisfied.
Is controlled.

The characteristic quantities which are useful for calculating the adjustment of the suction roller 9 or the gripper opening cam 10 are shown schematically in FIG.

FIG. 2 mainly shows a peripheral area of the suction roller 9 shown in FIG. The sheet 6 is guided along a suction roller 9 by a gripper bridge 3. The suction roller 9 is connected to a negative pressure source (not shown). The suction force F of the suction roller 9 is adjustable. As long as the sheet 6 is guided by the gripper bridge 3, the sheet 6 moves at the printing press speed. Sheet 6 is gripper bridge 3
Is released, the sheet 6 is braked based on the suction force F of the suction roller 9. Symbol s represents the length of the sheet 6 on which the suction force F of the suction roller 9 acts. In consideration of the coefficient of friction μ, the energy applied to brake the sheet 6 by the suction roller 9 and thus the energy applied to extract energy from the sheet 6 is given by the equation E = F * μ * s can be calculated. In the ideal case, such energy removal from the sheet 6 results in a kinetic energy 1/2 * m * v ^{2 of the} sheet 6 arriving in the area of the sheet ejection device of the sheet-fed rotary printing press. be equivalent to.

As already mentioned, the dimension s represents the length of the sheet 6 on which the suction force F of the suction roller 9 acts after the sheet 6 is no longer guided by the gripper bridge 3. It should be noted that the suction roller itself may rotate in some cases. Only when the suction roller 9 is stopped, s represents the length of the sheet 6 behind the suction roller 9. When the suction roller 9 rotates in the paper running direction or in the direction opposite to the paper running direction, the suction roller 9 is moved from the time when the gripper bridge 3 is additionally opened to the time when the sheet 6 passes through the suction roller 9. Circumference must be considered. Due to this circumferential section, the paper length s of the sheet 6 behind the suction roller 9 must be reduced when rotating in the paper running direction, whereas in the direction opposite to the paper running direction. Must be increased during the rotation of.

Generally speaking, the sheet 6 is the gripper bridge 3
, The shorter the paper length s on which the suction force F of the suction roller 9 acts, the better the stacking of the sheets 6 can be performed. Therefore, the most convenient way to calculate the adjustment of the adjusting element in the area of the delivery device is to make the adjustment of the gripper opening cam 10 first constant. In this case, the suction force F of the suction roller 9
By the formula ^{F = m * v 2/2} * μ * s, may be calculated in relation to the square of the velocity v of the sheet 6 to reach the range of the position of the paper discharge apparatus for a printing press. Data required for the calculation, for example, sheet mass or sheet length, width, thickness and density, and speed information are supplied to the computer 13 via the input device 12. This input is made by the operator or via corresponding measuring points provided on the printing press itself. For example, the paper thickness can be detected via the height adjustment value of the cover gauge. Information related to the size can be obtained from the tensile gauge position or the ink zone adjustment. The speed of the sheet 6 reaching the range in which the sheet ejection device is located can be easily detected from the rotation speed of the printing press. The information on the inking in the individual printing devices, which is possibly taken into account for correcting the mass m of the sheet 6, can be determined from the position of the ink zone screws.
Similarly, the computer may be provided with the amount of lacquer, fountain solution or powder applied to the sheet.

Formula ^{F = m * v 2/2} * μ * s ( although, s is a is constant) Accordingly, when the suction force F of the suction roller 9 is obtained, the computer in the regulation of the gripper opening cam 10, wherein s = the ^{m * v 2/2 * μ} * F max, to calculate the required correction.

For some reason, for example, if the calculated suction force F of the suction roller 9 does not result in the optimal ejection of the sheet 6 when the adjustment value of the gripper opening cam 10 is fixed, the operator is Through the input device 12, the possibility that the suction force F of the suction roller 9 is affected by the correction factor k is given. When the speed v increases and the adjustment limit value of the suction force _Fmax of the suction roller 9 is achieved, the computer 13 also considers the correction factor when calculating the paper length s. Of course, s can also be affected directly by the correction factor k. In such a way,
It is advantageous for the correction to be effective over the entire speed range, so that no discontinuity occurs in the adjustment of the suction force or in the adjustment of the paper length s on which the suction force F acts.

Further, the correction factor is stored in a memory device in association with the input parameter. Such correction is automatically taken into account for the adjustment of the suction force F of the suction roller 9 or the adjustment of the gripper opening cam 10 at the next printing with the same parameters.

──────────────────────────────────────────────────続 き Continued on the front page (31) Priority claim number P422052.4 (32) Priority date June 24, 1992 (1992.6.24) (33) Priority claim country Germany (DE) (72) Inventor Miltner, Karl-Hellman D-6915 Dosenheim im Schulstraße 12 (72) Inventor Rodi, Anton D-6906 Leimen 3 Karlsruer Straße 12 (56) References JP-A 62-153057 (JP, A) JP-A-62-267139 (JP, A) JP-A-1-88667 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65H 29/04 B65H 29 / 68

Claims (12)

(57) [Claims] 1. A device for controlling and / or controlling individual adjusting elements (9, 10, 11) provided in the area of a sheet ejection device (1) of a sheet-fed printing press, At least one input device (12) for inputting sheet-specific characteristic data and printing machine-specific characteristic data
And at least one computing device (13) for continued use of the characteristic data, and a control device (14), the control device comprising individual adjustment elements (9,1).
(11) wherein the arithmetic unit (13) arrives at the paper discharge device based on the characteristic data. The energy of the sheet (6) is calculated, and according to the calculated energy value, the arithmetic unit (13) is operated by the suction roller (9) and / or the gripper opening cam (10) and / or By defining control values for the blow nozzle (11) provided above the stack (7), the energy removal effected by the adjusting element reaches the area where the sheet ejection device (1) is located. The energy is almost equivalent to the energy of paper (6),
The control device (14) includes a suction roller (9) and / or a gripper release cam (10) and / or a stack (7).
Control of individual adjusting elements provided in the discharge device area of the sheet-fed printing press, characterized in that the upper blow nozzle (11) is controlled in accordance with the calculated value. And / or devices for control. 2. A processing unit (13), wherein ^{F = m * v 2/2} * μ * s { However, m represents a mass of a sheet-fed (6), v is Like reaching the discharge device Represents the speed of the leaf paper (6), μ represents the coefficient of friction, s represents the length of the paper on which the suction force (F) of the suction roller (9) acts, and 吸着 represents the suction force of the suction roller (9). Apparatus according to claim 1, adapted to calculate F). 3. An input device (12) for supplying information relating to each ink application, lacquer application, dampening solution application and / or powder application on a sheet to a computing device (13). 3. The device according to claim 2, wherein the arithmetic unit (13) takes into account such an increase in mass when calculating the energy of the sheet (6) reaching the delivery device. If the maximum absorption of wherein suction roller (9) (F _max) is reached, the arithmetic unit (13) by the equation ^{s = m * v 2/2} * μ * F max, adsorption roller (9 4. The apparatus according to claim 2, wherein the paper length (s) on which the suction force (F) of (1) acts is calculated. 5. A computing device (13) is, in relation to the energy of the sheet reaching the sheet discharge device (6), the equation ^{s = m * v 2/2} * μ * F, the suction roller (9 ) Calculates the paper length (s) on which the suction force (F) acts.
4) The gripper release cam (10) according to the calculated value
4. The device according to claim 1, wherein the device is adapted to control 6. When the maximum possible paper length (s _max) is achieved,
Processing unit (13), by the equation ^{F = m * v 2/2} * μ * s max, is adapted to calculate the suction force of the suction roller (9) (F), the control unit (14), The device according to claim 5, wherein the suction roller (9) is controlled according to the calculated value. 7. A correction factor for a printing press to affect the suction force (F) of the suction roller (9) or the paper length (s) on which the suction force (F) of the suction roller (9) acts. 7. The device according to claim 1, wherein an input device (12) for inputting k) is provided. 8. An input device (12) that allows a printing press to input a correction factor (k), and an arithmetic unit (13) determines the correction factor (k) by using the suction force (F) of a suction roller (9). ) Or when calculating the paper length (s), and when the adjustment limit value of the maximum suction force (F _max ) is achieved or the maximum paper length (s _max ) is achieved. Then, the correction factor (k) is used for calculating the paper length (s) or the suction force (F) on which the suction force (F) of the suction roller (9) acts. 7. The device according to claim 4 or claim 7, wherein 9. The apparatus according to claim 7, wherein the correction factor (k) is stored in a memory of the arithmetic unit (13) at the end of printing. 10. The apparatus according to claim 1, wherein the control device controls the powder application device such that the amount of powder applied per unit area in relation to the printing press speed is constant. apparatus. 11. The apparatus according to claim 10, wherein the computing device calculates the amount of powder in relation to the final pile height. 12. A control device (14) via an input device (12).
Can supply data on the mass distribution of the printed sheet (6), and over the entire surface of the sheet (6).
2. The device according to claim 1, wherein the control device controls the blow nozzle such that a pressure distribution related to the mass distribution of the sheet is formed.