Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F13/00—Common details of rotary presses or machines
  • B41F13/08—Cylinders
  • B41F13/10—Forme cylinders
  • B41F13/12—Registering devices
  • B41F13/14—Registering devices with means for displacing the cylinders
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H23/00—Registering, tensioning, smoothing or guiding webs
  • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
  • B65H23/044—Sensing web tension
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H23/00—Registering, tensioning, smoothing or guiding webs
  • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
  • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
  • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
  • B65H23/1882—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling longitudinal register of web
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2513/00—Dynamic entities; Timing aspects
  • B65H2513/10—Speed
  • B65H2513/11—Speed angular
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
  • B65H2515/30—Forces; Stresses
  • B65H2515/31—Tensile forces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2801/00—Application field
  • B65H2801/03—Image reproduction devices
  • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

• the invention relates to methods for regulating a circumferential register according to the preamble of claims 1, 3, 5 or 10.
• EP 0951 993 A1 discloses regulation of the transverse and longitudinal registers, the correction of the transverse register being carried out by means of a pull roller.
• a change in the longitudinal expansion is determined via web speeds and other parameters, such as stress-strain diagram and tension setpoints, and is attributed to control devices for cylinders of the printing units and / or an actuator for setting and correcting the cutting register.
• WO 00/34042 discloses a method for controlling a register, wherein a deviation of a web tension from a target value changes a speed and / or angular position of a first pressure point relative to a second pressure point.
• EP 0 950519 A1 shows a method for regulating the cut and color register of several webs to one another and between the individual printing units. Strains are determined on the basis of the operating points of the drives for the transport rollers, the cylinders and traction rollers used, and correction variables calculated therefrom are added to the reference variables for the cutting register or the color register as position offset.
• the invention has for its object to provide methods for regulating a circumferential register.
• the advantages that can be achieved with the invention consist in particular in that an error in the circumferential register due to voltage fluctuations or fluctuations in the scope of printing cylinders, e.g. B. caused by short-term changes in a thickness of the web, is counteracted without great effort and control.
• the error to be corrected can be a misalignment (error in the so-called color register) or a register error between the two sides of the printed web.
• a difference in the transport speed of the web that occurs between two pressure points is corrected by changing the relative rotational position of the pressure points to one another.
• the method and a corresponding device can be used particularly advantageously for register misalignment in printing units with a plurality of double printing units arranged one behind the other or one above the other in rubber-against-rubber operation, such as, for. B. with a so-called H-printing unit composed of eight printing tower, with at least two of the printing points printing in succession on the same side of a web.
• the method can be used advantageously to regulate the register between the two sides of the web.
• a change in the voltage over time after the last printing unit i. H. a difference in the voltage at a first and a second point in time, is used directly and linearly to correct the register offset of the second H-printing unit relative to the first. This requires extremely little measurement and control effort with sufficient accuracy.
• voltage regulation e.g. B. by means of a torque-controlled pull roller behind the printing tower.
• An uncontrolled pull roller with a controlled speed is sufficient here.
• a z. B. register offset caused by an adhesive is corrected in an advantageous embodiment exclusively via the circumferential register of the cylinder, in particular the cylinder of the first printing unit or the first two printing units.
• the first two printing units for example as an H printing unit, can be controlled jointly, so that only a single correction variable is determined and a single correction has to be carried out.
• Figure 1 is a schematic representation of a printing unit with roll changer.
• Figure 2 is a schematic representation of the voltage as a function of time when passing an adhesive point.
• Fig. 3 is a schematic representation of a correction variable or change in the angle of rotation as a function of time.
• a web-fed rotary printing press has one. Aft tower 01 and a reel changer 02. From the roll changer 02 runs a web 03, z. B. a paper web 03, for example via a feed mechanism, not shown, through the aft tower 01.
• the aft tower 01 has a total of four printing units 04; 06; 07; 08, synonymous with four clamping points 04; 06; 07; 08, on.
• these printing units 04; 06; 07; 08 as double printing units 04; 06; 07; 08 executed and work in rubber-against-rubber mode while pressing.
• Two of the printing units 04; 06 are within a first, in the example lower H-printing unit 09, and the other two printing units 07; 08 arranged within a second, in the example upper H-printing unit 11.
• Each of the printing units 04; 06; 07; 08 has at least 3, in the example four cylinders 12; 13; 14; 16, e.g. B.
• each of the printing units 04; 06; 07; In the example, 08 has at least one drive motor 17; 18; 19; 21 on.
• each cylinder 12; 13; 14; 16 each printing unit 04; 06; 07; 08 or each pair of transfer cylinders 13; 14 and forme cylinder 12; 16 together have a drive motor.
• the lower H-printing unit 09 to use a drive motor 17; 18 and the upper H-printing unit 11 by means of a drive motor 19; Form 21 driven drive system.
• a pull roller 22 is arranged after the last printing unit 08.
• a feed mechanism 23 (symbolized by a pull roller) is arranged between the roll changer 02 and the first printing unit 04.
• the printing units 04, 06; 07, 08 are assigned inking units (not shown) and, if necessary, dampening units.
• the paper web 03 changes its tension-elongation characteristic due to moisture (color, possibly dampening solution).
• the stress levels before and after the aft tower 01 are advantageously selected such that an elongation before and after the aft tower 01 is approximately the same.
• the voltage S1 is usually higher than the voltage S5. If there is now a change of a roll in the roll changer 02, in particular a flying change by means of adhesive, during stationary production conditions, an adhesive point with the paper web 03 runs from the roll changer 02 through the aft tower 01.
• B. an area on which two layers of paper web 03 and an adhesive layer, for. B. includes an adhesive strip.
• a so-called adhesive flag, ie an area of two-ply paper, can extend far beyond the width of the adhesive point.
• the paper web 03 thus has an area 24 with a greater thickness, which moves through the printing press.
• the area 24 of greater thickness now passes through a printing unit 04; 06; 07; 08, because of the increased thickness and the fixed center distance of the cooperating cylinders 13; 14 an elastic support on the cylinders 13; 14, e.g. B. rubber blankets, slightly compressed. If the angular velocity remains the same, the peripheral speed of the cylinders 13 decreases; 14. For example, the higher peripheral speed is still present in the printing unit 07, while at the same time the peripheral speed in the printing unit 06 is reduced when passing through the area 24.
• the level of the voltages S2 increases suddenly; S3; S4, S5 (Fig. 2 for the voltage S5).
• the sudden increase in voltages S2; S3; S4; S5, and thus the strain depends on the original levels of the stresses S1; S2; S3; S4; S5, in particular a difference between S1 and S5, and on the length of the adhesive tail, ie on the length of the region 24 of greater thickness.
• the latter in particular in the case of staggered cylinders, ie several channels on one lateral surface of the cylinder are arranged side by side in the axial direction, but offset from one another in the circumferential direction. In this case, if the length of the adhesive tail is greater than or equal to the distance between the channels in the circumferential direction, partial relief can take place.
• the sudden increase in voltage S2; S3; S4; S5, in particular the voltage S5 from a setpoint S-Soll behind the eight-tower 01 z. B. determined by a difference ⁇ S (FIG. 2) before and after passing through area 24 and processed further.
• a correction quantity K is formed, and the register offset ⁇ P that occurs between two printing units 04; 06; 07; 08 or between two H-printing units 09; 11 corrected.
• This compensation takes place i. d.R by a relative change ⁇ of an angular position ⁇ , z. B. the angular position ⁇ , the H-pressure units 09; 11 or the cylinder 12; 13, 14; 16 of the printing units 04; 06; 07; 08 to each other.
• the voltage S5 is measured using a measuring device 26, e.g. B. a sensor 26 such. B. a measuring roller 26, after the four-high tower 01, here following a catch roller 28, determined and given to the control device 27, a computer 27 or to the control center computer 27. From the difference ⁇ S, the control device 27 or the computer 27 determines the average correction variable K between the lower H-printing unit 09 and the upper H-printing unit 11.
• a measuring device 26 e.g. B. a sensor 26 such. B. a measuring roller 26, after the four-high tower 01, here following a catch roller 28, determined and given to the control device 27, a computer 27 or to the control center computer 27. From the difference ⁇ S, the control device 27 or the computer 27 determines the average correction variable K between the lower H-printing unit 09 and the upper H-printing unit 11.
• the angle of rotation position ⁇ of the lower H-printing unit 09 in particular that of the forme cylinder 12; 16 of the printing units 04 and 06, is now made by a corresponding change ⁇ in the angle of rotation ⁇ relative to the lower H printing unit 09, in particular its forme cylinder 12; 16, rotated and thus the misalignment ⁇ P that has occurred is corrected. Since in the example no tension control by means of the pull roller 22 or another device, such as. B. a dancer roller, behind the last printing unit 08 up to and including the drawing roller 22, the voltage S5 drops with further transport of the paper web 03 through the printing units 04; 06; 07; 08 slowly.
• the circumferential register is then readjusted in the opposite direction by means of the correction variable K in accordance with the changing difference ⁇ S between S5 and S-soll (FIG. 3). This is advantageously not carried out continuously but at suitable intervals.
• the described regulation of the circumferential register is advantageous for at least three printing units 04; 06; 07; 08, with a distance a1 (z. B. 0.4 m to 1 m) between the two first clamping points 04; 06 is significantly smaller than a subsequent distance a2 (eg> 1 m) to a third clamping point 07.
• the eight-high tower 01 consisting of two H-printing units 09; 11 is an example of this.
• a voltage-related register offset ⁇ P is low, so that the regulation for the first two printing units 04; 06 in the same way relative to the upper printing units 07; 08, and not additionally relative to each other.
• the regulation of the correction of the register offset ⁇ P by means of the correction variable K as a function of the difference ⁇ S from the initially spontaneously increasing and subsequently decreasing change in the voltage S5 by a difference ⁇ S is preferably carried out as a proportional control, with the difference ⁇ S between the voltage S5 and the Correction variable K advantageously a linear relationship is established.
• the control device 27 is designed in an advantageous embodiment as a proportional controller 27.
• the slope a for the regulation of the lower H-pressure unit 09 compared to the upper H-pressure unit 09 for the eight-high tower 01 under consideration lies between 1 / (35 daN / m / mm) and 1 / (45 daN / m / mm), in particular at approx.
• the angle of rotation position ⁇ for the lower H-pressure unit 09 is corrected relative to the upper H-pressure unit 11 in such a way that an offset on the circumference of the modified cylinder 12; 13; 14; 16 by about 0.25 mm.
• the change ⁇ in the angle of rotation position is proportional to the correction value K and the register offset ⁇ P.
• the relative change .DELTA..phi. Is, for example, approximately 0.12.degree.-0.13.degree.
• the angle of rotation position the angular velocity A ⁇ can also be changed for a certain time.
• Angular velocity A ⁇ is therefore a function of the voltage S5 or the difference
• the register offset ⁇ P is corrected only by means of the register adjustment.
• a voltage regulation in the area of the voltage S5 behind the last printing unit 08 does not take place in this context.
• the pull roller 22 is designed as a pull roller 22 controlled with respect to its speed, to which neither tension values nor torque values have to be traced.
• the measured voltage S5 is advantageously used to regulate the voltage S1 (shown in dashed lines in FIG. 1) in order to meet the demand for the above-mentioned. Condition to meet a larger voltage S1 compared to S5.
• each of the cylinders 12; 13; 14; 16 each printing unit has its own drive motor 17; 18; 19; 20 on. However, all drive motors 17; 18 one of the two printing units 04; 06 or all drive motors 17; 18 of the two lower printing units 04; 06 corrected by the same value at the same time. For each pairwise drive of a forme cylinder 12; 16 with the associated transfer cylinder 13; 14 the above is to be applied accordingly.
• the method for regulating the circumferential register is also for configuration of the printing press other than the eight-high tower 01 with at least two printing units 04; 06; 07; 08 suitable if these several clamping points 04; spaced apart from one another in the running direction of the paper web 03; 06; 07; 08 or printing units 04; 06; 07; 08 or pressure points 04; 06; 07; 08 has.
• This can be, for example, a printing press, which is a plurality of bridge printing units arranged one above the other or a plurality of standing rubber-to-rubber printing units arranged side by side with the paper web 03 being guided horizontally.
• the respective first transfer cylinder 13 can also interact with an impression cylinder 14 designed as a steel cylinder 14.
• the voltage S5 is measured after the last printing unit 08, and the printing units 04; 06; 07 regulated by means of the difference ⁇ S or the voltage S5.
• This can again be done in groups with several successive printing units 04; 06 or also with individual printing units 04; 06; 07 happen.
• the printing units 04; 06; 07 are always regulated against the unchanged last printing unit 08. Between the first and the second printing unit 04; 06, as a rule, no relative change has to be made due to the incomplete wetting.
• the method is equally suitable for regulating the register between the two sides of the web 03 printed in succession.
• This is, for example, for the arrangement of two satellite printing units 09; each having one or more printing points; 11 an advantage.
• Nine-cylinder satellite or ten-cylinder satellite are traversed by the web 03 one after the other, in one of the printing units 09; 11 one side of the web 03, and then in the other printing unit 11; 09 the other side of the web 03 is printed in one or more colors.
• a measurement and evaluation of the difference ⁇ S in the voltage S2; S3; S4; S5 can also be used between the individual terminal points 04; 06; 07; 08 take place and a change in the rotational position of the preceding clamping points 04; 06; 07; 08 can be effected.
• Control device computer, control center computer, proportional controller 28 capture roller

Applications Claiming Priority (3)

Publications (2)

Family

ID=7664831

Family Applications (1)

Country Status (6)

Families Citing this family (11)

Family Cites Families (13)

• 2000
  • 2000-11-27 DE DE10058841A patent/DE10058841B4/de not_active Expired - Fee Related
• 2001
  • 2001-11-21 DE DE50112577T patent/DE50112577D1/de not_active Expired - Fee Related
  • 2001-11-21 EP EP01997393A patent/EP1347878B1/fr not_active Expired - Lifetime
  • 2001-11-21 AT AT01997393T patent/ATE363389T1/de not_active IP Right Cessation
  • 2001-11-21 US US10/416,526 patent/US6766737B2/en not_active Expired - Fee Related
  • 2001-11-21 AU AU2002218991A patent/AU2002218991A1/en not_active Abandoned
  • 2001-11-21 WO PCT/DE2001/004368 patent/WO2002042075A1/fr active IP Right Grant

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events