FR2895935A1 - PRINTING MODULE OF A ROTARY PRINTING MACHINE WITH COILS - Google Patents

Abstract

A printing module of a rotary web printing machine having at least one printing unit, the or each printing unit having a plate cylinder, an inkwell cooperating with the plate cylinder and a cylinder of transfer cooperating with the plate cylinder. Each transfer cylinder of each printing unit cooperates with at least one backpressure cylinder to feed a printing material through the gap between each transfer cylinder and the respective counterpressure cylinder, each transfer cylinder. each printing unit being driven by a own drive means. Each counter-pressure cylinder (28) has no own drive means but is driven by at least one mechanical drive link from at least one transfer cylinder (24).

Description

Field of the Invention The present invention relates to a module

  for printing a rotary reel printing machine having at least one printing unit, the or each printing unit having a plate cylinder, an ink carrier cooperating with the plate cylinder and a cylinder transfer member cooperating with the plate cylinder, the or each transfer cylinder of the or each printing unit cooperating with at least one backpressure cylinder so that a printing material is conducted for its printing through the the gap between the or each transfer cylinder and the respective counterpressure cylinder, and the or each transfer cylinder of the or each printing unit being driven by a own drive means. State of the art The satellite printing modules of rotary printing machines with coils comprise several printing units; each printing unit comprises a plate cylinder, an ink or ink mechanism cooperating with the plate cylinder and a transfer cylinder cooperating with the plate cylinder. Beside the inkwell, a moistener may also be associated with the plate cylinder of each printing unit of a satellite print module. The transfer cylinders of the printing units of a satellite printing module cooperate with at least one backpressure cylinder so as to pass a print material to be printed in the gap between the transfer cylinders. and a back-pressure cylinder. In particular, rotary web printing machines have been widely developed, with so-called nine-cylinder satellite printing modules comprising four printing units and four plate cylinders as well as four transfer cylinders. and a single counter-pressure cylinder cooperating with all transfer cylinders. In the case of a nine-cylinder satellite printing module, the transfer cylinders of the printing units roll on a single back-pressure cylinder.

  The known satellite printing units of rotary reel printing machines have a transfer cylinder of each printing unit and the or each counter-pressure cylinder is dragged by its own drive means. Thus, the nine-cylinder satellite printing modules are equipped with five drive motors namely four engines for transfer cylinders four printing units and a motor driving the cylinder back pressure. There is no mechanical drive connection between the transfer cylinders and the backpressure cylinder.

  The transfer cylinders of such satellite printing modules are lined with rubber blankets, stretched. Depending on the characteristics of the blankets and any supports, there will be for the operation of the transfer cylinder, a resulting effective diameter. The resulting effective diameters of the transfer rollers may differ from one another and do not necessarily correspond to the diameter of the counterpressure roll. If the transfer cylinders and the counter-pressure cylinder are driven at the same rotational speed, these differences in diameter result in different peripheral speeds at the points of contact between the back-pressure cylinder and each transfer cylinder. . If the transfer cylinders and the counter-pressure cylinder are driven in phase and in synchronism, this results in irregular conditions at the contact points between the transfer cylinders and the back-pressure cylinder generating tightening torques. that solicit or relieve the motors. In the extreme case, the motors can even be biased to their authorized limits so that in particular the drive means of the back-pressure cylinder must be designed with a relatively large power reserve; this translates into a high cost. Similar problems are encountered with print modules having only one printing unit. OBJECT OF THE INVENTION The present invention aims to solve the difficulties of the state of the art and to develop a new printing module for a rotary printing machine with coils.

  DESCRIPTION AND ADVANTAGES OF THE INVENTION DESCRIPTION AND ADVANTAGES OF THE INVENTION For this purpose the invention relates to a printing module for a rotary printing machine with reels of the type defined above, characterized in that the or each cylinder counterpressure does not comprise own drive means but is driven by at least one mechanical drive link from at least one transfer cylinder Thus, according to the invention, each counter-pressure cylinder does not comprise no drive means of its own but is driven by at least one mechanical drive link from at least one transfer cylinder. Thus, there is no flow of torque between the counter-pressure cylinder and the transfer cylinder to which it is coupled, this flow acting outwards. The common drive means of a transfer cylinder and the counter-pressure cylinder associated therewith are only subjected to a torque flow generated by the other transfer cylinders. Thus, the additional constraints and the lack of stress on the drive motors will have less importance for the printing module according to the invention, which makes it possible to design the engines of the printing module according to the invention with a lower power reserve. The invention not only reduces the number of drive means used, but also allows them to be designed smaller which results in significant savings. According to another advantageous characteristic of the invention it is embodied in the form of a nine-cylinder satellite printing module having four printing units, each printing unit consisting of a plate cylinder, a an ink fountain cooperating with a respective plate cylinder and a transfer cylinder cooperating with the respective plate cylinder, and the transfer cylinders of the printing units cooperating with a single backpressure cylinder. According to another advantageous characteristic of the invention it is embodied in the form of a seven-cylinder printing module comprising three printing units, each printing unit being composed of a plate cylinder, a ink fountain cooperating with the plate cylinder and a transfer cylinder cooperating with the plate cylinder, and the transfer cylinders of the printing units cooperating with a single back-pressure cylinder.

  According to another advantageous characteristic of the invention, it is implemented as a five-cylinder printing module and two printing units, each printing unit having a plate cylinder, an inkwell cooperating with the plate cylinder and a transfer cylinder cooperating with the plate cylinder, and the transfer cylinders of the printing units cooperating with a single counter-pressure cylinder. According to other advantageous features of the invention: - the or each drive connection between the transfer cylinder and the respective counter-pressure cylinder is engageable and between the transfer cylinder and the respective back-pressure cylinder, it there is a clutch, - the clutch is made as friction clutch or clutch with connection by the form, - the or each drive connection between a transfer cylinder and the respective counter-pressure cylinder is made by sprockets or notched belts. If, according to an advantageous characteristic in the printing mode, the backpressure cylinder is coupled to and driven by a single transfer cylinder, then the backpressure cylinder is coupled to the transfer cylinder of the group If the printing unit of the black ink does not print, the black ink transfer cylinder is driven to the non-printing position.

  According to another characteristic, if in the printing mode, the backpressure cylinder is coupled to several and especially to all the transfer cylinders and is driven therefrom, advantageously, the drive means of the cylinder of transfer to which the backpressure cylinder is coupled forms a master drive means, while the drives of the other transfer cylinders to which the backpressure cylinder is coupled, is a slave drive means with respect to the drive master. Drawings The present invention will be described in more detail below with the aid of exemplary embodiments shown in the accompanying drawings, in which: FIG. 1a is a very diagrammatic view of a new satellite printing module; According to the state of the art, FIGS. 1b and 1c are diagrams explaining the operation of a nine-cylinder satellite printing module according to FIG. 1a. FIG. 2a is a very diagrammatic view of FIG. A nine-cylinder satellite printing module according to the invention, and FIGS. 2b and 2c show diagrams explaining the operating mode of the nine-cylinder satellite printing module according to the invention as shown in FIG. 2a. DESCRIPTION OF PREFERRED EMBODIMENTS Referring to FIGS. 2a-2c, the present invention will be described below in more detail after reference has previously been made to the state of the art shown in FIGS. Figure shows it very schematically, a nine-cylinder satellite printing module known according to the state of the art; this module includes four printing groups. For these four printing units, the plate cylinders 10, 11, 12, 13 and the transfer rolls 14, 15, 16, 17 are shown. The printing rolls 10-13 of the printing units cooperate with each other. with unrepresented inkwells as well as moisteners for applying the ink and the wetting agent to the printing plates or printing forms installed on the plate cylinders 10-13. The transfer cylinders 14-17 of the printing units roll according to Fig. 1a on the plate cylinders 10-13 of each printing unit and blankets are tensioned on the transfer rolls 14-17. All the transfer cylinders 14-17 of the printing units of the nine-cylinder satellite printing module according to FIG. 1c cooperate with a single counterpressure cylinder 18.

  According to FIG. 1a, in the state of the art, each transfer cylinder 14-17 of the printing units and the backpressure cylinders 18 is associated with a drive means or drive motor M, in order to be able to drive on the one hand the transfer cylinders 14-17 of the printing units and on the other hand the back-pressure cylinder M with a separate drive means M; between the transfer cylinders 14-17 and the counter-pressure cylinder 18, there is no mechanical drive connection.

  As already indicated, the transfer cylinders or blanket cylinders 14-17 are provided with blankets, stretched; these blankets give in connection with any intermediate elements, the effective diameter resulting from the transfer cylinder 14-17. The difficulty then arises that, as a function of the blanket, the effective diameter resulting from the transfer rolls 14-17 may differ from each other with respect to the counter pressure cylinder 18 so that when the transfer cylinders 14-17 and the backpressure cylinder 18 are driven by their phase drive means M at rotational speeds, synchronously, at the points of contact between the transfer cylinders 14-17 and the counter-pressure cylinder 18 there will be different peripheral speeds that result in a torque flow or torque between the cylinders. This solicits or relieves the motors M driving the transfer cylinders 14-17 and the counter-pressure cylinder 18. This situation will be explained below with reference to Figures lb and lc. If FIG. 1b shows for the four transfer rolls 14-17 and the backpressure roll 18, the stresses or torques P acting on the drive means M; the case of a resultant overall effective diameter has thus been represented for the four transfer rolls 14-17 and for a diameter of the counter-pressure roll 18 which is smaller than the effective diameter resulting from the four transfer rolls 14-17. In this case, the drive means M of the transfer rolls 14-17 will be additionally loaded in the hatched areas 19 by each time a simple tightening torque between the transfer cylinder and the backpressure cylinder while the drive means M of the counter-pressure cylinder 18 will be relieved by the quadruple tightening torque. In a situation of extreme stresses according to FIG. 1c, it can result that, depending on the amplitude of the tightening torque (according to the hatched areas 19), the motor M driving the counter-pressure cylinder 18 will be biased to the top its authorized limit (-100%) in braking mode, so that at least the motor M driving the back-pressure cylinder 18 must be designed with a large power reserve. This causes a high cost of producing such a group of satellite printing. FIG. 2a very schematically shows a preferred exemplary embodiment of a nine-cylinder satellite printing module of a satellite printing module according to the invention which has four printing units and four plate cylinders 20, 21, 22, 23 and the transfer cylinders 24, 25, 26, 27 connected to the printing units. Not shown inkcases cooperate with the plate cylinders 20-23. The same applies to moistening devices so that the transfer cylinders 24-27 roll on the plate cylinders 20-23.

  A single backpressure cylinder 28 cooperates with the transfer cylinders 24-27 of the printing units to form printing areas between the backpressure cylinder 28 and the transfer cylinders 24-27. The print material passes through these print areas for printing.

  In the satellite printing unit according to the invention shown in FIG. 2a, only the transfer cylinders 24-27 of the printing units are associated each time with a drive or drive motor M while the back pressure cylinder 28 is not equipped with any clean drive means but is driven by at least one mechanical drive link by at least one transfer cylinder. In the exemplary embodiment of Figure 2a, the counter-pressure cylinder 28 is coupled by a mechanical drive link to the transfer cylinder 24 to be dragged by it; the mechanical drive link between the transfer cylinder 24 and the backpressure cylinder 28 includes a clutch 29 for opening or closing the drive link between the backpressure cylinder 28 and the counter-pressure cylinder 28. 24. The advantages of the satellite printing module according to the invention shown in FIG. 2a vis-à-vis the satellite printing module according to the state of the art shown in the figure appear directly from the comparing Figures 2b and 2c with Figures lb, le; FIGS. 2b and 2c show the stresses or torques P acting on the drive motors M of the transfer rollers 24-27 in the case where the four active diameters resulting from the four transfer rollers 24-27 are identical and the diameter the counter-pressure cylinder 28 is smaller than the effective diameter resulting from the four transfer cylinders 24-27. Thus, the motor M driving the transfer cylinder 24 coupled to the backpressure cylinder 28 will only have to provide the difference between the triple tightening torque, the braking between the transfer cylinders 25, 26, 27 and the torque The stresses generated by the tightening torques between the transfer cylinders 25, 26, 27 and the counter-pressure cylinder 28 are indicated in FIGS. 2b and 2c. by hatched areas 30; in a case of extreme biasing according to FIG. 2c for driving the transfer cylinder 24 coupled to the backpressure cylinder 28, there is a reserve of sufficient power which can even be used for braking if the triple voltage torque is greater than to the driving torque of the printing unit to be provided by the driving means M of the transfer cylinder 24. In the embodiment shown in FIG. 2a, the backpressure cylinder 28 is coupled to the cylinder of FIG. transfer 24 of a printing unit and is driven by the drive means M 30 thereof. The transfer cylinder 24 coupled to the counter-pressure cylinder 28 is preferably the transfer cylinder of the printing unit which prints the black ink on the printing material. If, exceptionally, the printing unit which supplies the black ink is not used for printing, then according to the invention, the printing unit providing the black ink is brought into the disengagement position. As already indicated above, the mechanical drive connection between the backpressure cylinder 28 and the transfer cylinder 24 is coupled by a clutch 29 so that while the backpressure cylinder 28 is being surrounded by by the printing material, it can remain stationary or it can even introduce a new strip of printing material, and the back-pressure roll 28 will then be driven by wrapping it with the printing material. The disengageable drive connection between the counter-pressure cylinder 28 and the transfer cylinder 24 is preferably provided by means of toothed belts or pinions. The pi-gnons or toothed belt pulleys are connected either integrally or removably to each cylinder. Unlike the embodiment shown, it is also possible to couple the backpressure cylinder on several transfer cylinders at the same time by corresponding drive links. Each of the integral drive links preferably have a clutch. Alternatively, one can also have only one clutch which in the engaged state couples the counter-pressure cylinder to all transfer cylinders. If a clutch is integrated in each drive link, it is also possible to couple the pressure cylinder to either one of the transfer cylinders. The clutch or each clutch integrated in the drive links is made by a friction clutch or a clutch by form connection. In the case where the counter-pressure cylinder is coupled at the same time to a plurality of transfer cylinders, one or more clutches can be closed, but it is nevertheless preferable to have an embodiment in which the counter-pressure cylinder can be coupled. simultaneously with all transfer cylinders by the corresponding clutch closure. In this case, all the drive means of the transfer rollers are engaged and one of the drive means of a transfer cylinder constitutes the master drive, while those of the other transfer rollers are slave drives. to the master training. In this case, to ensure a print respecting the registers, it is necessary to have peripheral register adjustment units on the different printing groups; such peripheral registers are customary for those skilled in the art. When using friction clutches or clutches that can be engaged and decoupled depending on the position, the adjustment units of the peripheral registers can be removed. In the embodiment shown, all the cylinders, ie the plate cylinders, the transfer cylinders and the counter-pressure cylinder have substantially the same periphery; it is thus a printing module with a periphery ratio of the 1: 1: 1 rollers. However, the peripheries of the rolls are variable. Thus the invention can also be applied to printing units having a 1: 2: 3 periphery ratio or a 2: 2: 3 periphery ratio for plate cylinders, rolls of 20 transfer and counterpressure cylinder. We can also have ratios of 1: 2: 4 or 2: 2: 4, etc. Although the invention has been described with reference to the drawings, the example of a nine-cylinder satellite printing module, it is not limited to this type of nine-cylinder satellite printing module. The invention can also be applied to seven-cylinder or five-cylinder printing modules with three or two printing units and to a single back-pressure cylinder, as well as to satellite printing modules. ten-cylinder with four printing units and two-cylinder back pressure. It is also possible to envisage applying the invention to a three-cylinder printing module comprising a single printing unit and thus a single backpressure cylinder.

Claims (12)

  1) Print module of a rotary printing machine with coils having at least one printing unit, the or each printing unit having a plate cylinder, an ink carrier cooperating with the plate cylinder and a transfer cylinder cooperating with the plate cylinder, the or each transfer cylinder of the or each printing unit cooperating with at least one counterpressure cylinder so that a printing material is conducted for its printing through the interval between the or each transfer cylinder and the respective back-pressure cylinder, and the or each transfer cylinder of the or each printing unit being driven by a own drive means, characterized in that the or each cylinder against pressure (28) has no own drive means but is driven by at least one mechanical drive link from at least one transfer cylinder (24). 2) Print module according to claim 1, characterized in that it is in the form of a nine-cylinder satellite printing module having four printing units, each printing unit consisting of a plate cylinder (21, 22, 23, 24), an inkwell cooperating with a respective plate cylinder and a transfer cylinder (24, 25, 26, 27) cooperating with the respective plate cylinder, and the transfer cylinders of the printing units cooperate with a single backpressure cylinder 28. 3) Print module according to claim 1, characterized in that it is in the form of a seven-cylinder printing module comprising three printing units, each printing unit being composed of a plate cylinder, an inkwell cooperating with the plate cylinder and a transfer cylinder cooperating with the plate cylinder, and the transfer cylinders of the printing units cooperating with a single counter-pressure cylinder. 4) Print module according to claim 1, characterized in that it is carried out as a five-cylinder printing module and two printing units, each printing unit having a plate cylinder, an inkwell cooperating with the plate cylinder and a transfer cylinder cooperating with the plate cylinder, and the printing group transfer cylinders co-operate with a single backpressure cylinder. 5) Print module according to claim 1, characterized in that the or each drive connection between the transfer cylinder (24) and the respective counter-pressure cylinder (28) is engageable with a clutch (29). between the transfer cylinder (24) and the respective counterpressure cylinder (28). 6) Printing module according to claim 5, characterized in that the clutch (29) is formed as friction clutch or clutch 25 by form connection. 7) Printing module according to claim 1, characterized in that the or each drive connection between a transfer cylinder (24) 30 and the respective counter-pressure cylinder (28) is made by pi-gnons or notched toothed belts. 8) Printing module according to claim 1, characterized in that in printing mode, the back-pressure cylinder (28) is coupled to a single transfer cylinder (24) and is driven by it. 9) Printing module according to claim 8, characterized in that the counter-pressure cylinder (28) is coupled to the transfer cylinder (24) of the printing unit which prints the black ink on the printing material . 10) Print module according to claim 9, characterized in that if the printing unit of the black ink does not print, the transfer cylinder (24) of the black ink is driven to the non-printing position. impression. 11) Printing module according to claim 1, characterized in that in printing mode, the back-pressure cylinder is coupled to several and especially to all transfer cylinders and is driven by them. 12) Printing module according to claim 11, characterized in that the driving means of the transfer cylinder which is coupled to the back pressure cylinder forms a master drive means while the drives of the other transfer cylinders to which is coupled the backpressure cylinder, is a slave drive means with respect to the master drive.