EP0782919B1 - Printing unit for a rotary web printing machine - Google Patents

Description

The present invention relates to a printing unit for a web-fed rotary printing press.

US 5,127,322 describes a web-fed rotary printing press with a satellite printing unit having a central impression cylinder and four associated blanket cylinders, with a respective plate cylinder attached to each blanket cylinder. A web is guided down into the printing unit, wound around the central impression cylinder and led out of the top of the printing unit. For the change of the printing plates mounted on the plate cylinder, a movable robot arm is provided. The system is designed for quick replacement of printing plates.

US 5,323,702 discloses a sleeve-shaped blanket for a blanket cylinder in an offset printing press. The sleeve-shaped pressure blanket is applied axially to a blanket cylinder and removed in the same way from this. Conventional blankets and cylinders having a nip or passage passing through the nip between the blanket cylinder and the plate cylinder and between the blanket cylinder and the impression cylinder cause vibrations and shocks in the printing unit, adversely affecting print quality. With a gapless sleeve-shaped blanket, a printing unit can run at high speeds without significant vibrations or shocks and with minimal slippage of the printing surfaces - which could smear the printed image - as well as without overheating.

EP 0 225 509 B1 discloses an apparatus for indirectly printing a web comprising a three-cylinder printing mechanism mounted with their respective ends in the two side walls of a printing press. The plate cylinder and the blanket cylinder carry respective exchangeable sleeves.

To replace the sleeve of the blanket cylinder, the printing press is stopped, the blanket cylinder released from one of its associated side walls and the sleeve removed from the cylinder or applied to this.

DE 43 41 246 describes a printing unit according to the preamble of independent claim 1.

According to the present invention, a printing unit for a web-fed rotary printing press comprises a housing having first and second sections and a central impression cylinder mounted in first and second housings in the first and second housing sections. The printing unit further comprises at least two blanket cylinders in contact with the central impression cylinder and at least two plate cylinders in contact with the blanket cylinders. The blanket cylinders are cantilevered or stored in the first housing section, d. H. they are supported during setup or standstill of the printing unit only in the first housing section.

Since the blanket cylinders are stored cantilevered during setup, sleeve-shaped blankets can be axially applied to the blanket cylinder and removed in the same way from this. This shortens set-up time compared to conventional flat blanket stretching. In addition, since the sleeve-shaped blanket has no gap in its outer surface, the vibrations and / or shocks are normally eliminated when the gap is moved through the pressure gap between the plate cylinder and blanket cylinder when the blanket cylinder rotates. Thus, the wear of machine parts and printing defects caused by said vibration and shock is reduced as compared with conventional satellite printing machines and the conventional flat blankets used, and machine speeds of, for example, 914 m (3000 feet) per minute can be achieved.

Also, the use of a cantilevered blanket cylinder facilitates access to the printing unit during set up.

According to a second embodiment of the present invention, the plate cylinder is also cantilevered during setup in the first housing portion. This allows the use of sleeve-shaped printing plates, which can be applied quickly and easily axially on the plate cylinder and removed in the same way from this. This results in an even easier accessibility to the printing unit during setup. Another advantage of using sleeve-shaped printing forms and blankets instead of the conventional blankets and printing plates is that there is no gap in the printing form or blanket so that no unprinted area is formed between two successive pages of a printed web. Thus, if the printing form consists of a flat plate whose opposite ends are joined together, the only non-printable area on the web will be caused by the thin seam in the printing form. If the sleeve-shaped printing form is also seamless, there will be no unprintable area on the web

According to a further embodiment of the present invention, the blanket cylinder and / or the printing form cylinder is cantilevered both during setup, ie during standstill, as well as during operation of the printing unit in a side wall. This further shortens the time required for the blanket and / or printing plate change because it eliminates the need for a release mechanism on the second housing section.

According to a further embodiment of the present invention, the sleeve-shaped printing plates and / or the sleeve-shaped blankets are stretched by compressed air, which is supplied by openings located in the outer peripheral surface of the printing forme cylinder and / or the blanket cylinder, to the printing forms and / or blankets on the respective Apply cylinder or remove it.

According to a further embodiment of the invention, a Seitenregistereinstellsystem is provided by the automatically adjusted during the elongation of the printing plate by air pressure, a lateral position of the printing plate with respect to the printing form cylinder. For this purpose, a first pin is provided at the first end of each printing forme cylinder to laterally adjust the sleeve-shaped printing plates on the printing forme cylinders. Further, the side register adjustment system preferably includes a second pin at the second end of each of the forme cylinders, each second pin being movably mounted in a bore in the plate cylinder. In the preferred embodiment of the invention, an actuator is provided to move each of the second pins radially into and out of the bores. Furthermore, it may be provided that further pins are arranged along the outer peripheral surface of each printing forme cylinder to position a plurality of sleeve-shaped printing plates on each printing forme cylinder in the axial direction, wherein the further pins may be movably mounted in respective further holes formed in each printing forme cylinder and a respective actuator is connected thereto, in such a way that each of the further pins is preferably individually controllable.

According to this embodiment of the invention, a printing unit having an automatic page register adjustment system comprises the following: a printing form cylinder having a sleeve-shaped printing form mounted thereon, a first pin attached to a first end of the outer surface of the printing form cylinder, and a second pin attached to the second end of the outer surface of the printing form cylinder wherein the second pin is movably mounted in a bore formed in the printing form cylinder and there are a plurality of apertures in the outer surface of the printing form cylinder, a sleeve expansion mechanism connected to the printing block cylinder through which compressed air is passed through the plurality of apertures radially around the printing form to stretch and an actuator connected to the second pin, through which the second pin is moved radially into and out of the bore to adjust the page register of the printing form.

Furthermore, a plurality of printing plates can be mounted on the printing form cylinder and further pins can be provided along the outer peripheral surface of the printing plate cylinder, each of the further pins being movably arranged in respective further bores formed in the printing plate cylinder. The printing unit may further comprise a respective actuator associated with each further pin and a control unit associated with the actuators which controls the side register setting of each of the printing forms by moving the second pin and the further pins into and out of their respective bores their individual bores out via the associated actuators controls individually.

According to a final embodiment of the present invention, a system for automatically adjusting the circumferential register of the printing unit is provided. By an electric motor, a wheel is rotated, which is in contact with the outer peripheral surface of the sleeve-shaped printing forme, while it is stretched by compressed air and thereby freely rotatable on the peripheral surface of the associated cylinder. By controlled via the electric motor rotation of the wheel on the peripheral surface of the sleeve-shaped printing form, the printing plate is rotated as long as the printing forme cylinder until the registration accuracy or Passerhaltigkeit the circumferential register is achieved.

• einen Druckformzylinder mit einer darauf angebrachten hülsenförmigen Druckform, eine sich an der Außenfläche des Druckformzylinders befindliche erste Marke, eine sich an der Außenfläche des Druckformzylinders befindliche zweite Marke, eine Vielzahl von sich in der Außenfläche des Druckformzylinders befindliche Öffnungen, einen mit dem Druckformzylinder verbundenen Hülsendehnungsmechanismus, durch welchen Druckluft durch die Vielzahl von Öffnungen geführt wird, um die Druckform radial zu dehnen;
• ein Motor mit einem darauf angebrachten Rad, das die Druckform kontaktiert, wenn sich diese in ihrem gedehnten Zustand befindet, einen neben dem Druckformzylinder angebrachten ersten Sensor zum Abtasten der ersten Marke, einen neben dem Druckformzylinder angebrachten zweiten Sensor zum Abtasten der zweiten Marke, eine Steuereinheit mit einem dem ersten Sensor zugeordneten ersten Eingang, einem dem zweiten Sensor zugeordneten zweiten Eingang, und einem dem Motor zugeordneten Ausgang, wobei die Steuereinheit die umfängliche Position der Druckform relativ zum Druckformzylinder auf der Basis der von dem ersten und zweiten Sensor erhaltenen Signale steuert.

According to this embodiment of the invention, an offset printing unit preferably comprises the following features:

• a printing form cylinder having a sleeve-shaped printing form mounted thereon, a first mark located on the outer surface of the printing form cylinder, a second mark located on the outer surface of the printing form cylinder, a plurality of openings located in the outer surface of the printing form cylinder, a sleeve expansion mechanism connected to the printing form cylinder, through which compressed air is passed through the plurality of apertures to radially expand the printing form;
• a motor having a wheel mounted thereon and contacting the printing plate when in its stretched state, a first sensor for scanning the first mark, mounted adjacent to the printing block cylinder, a second sensor for scanning the second mark mounted adjacent to the printing plate cylinder, a control unit a first input associated with the first sensor, a second input associated with the second sensor, and an output associated with the motor, the controller controlling the circumferential position of the printing plate relative to the plate cylinder based on the signals received from the first and second sensors.

The features and advantages of the present invention will become more apparent from the following description of preferred embodiments taken in conjunction with the accompanying drawings explained below.

Fig. 1

eine Seitenansicht eines Satellitendruckwerks gemäß vorliegender Erfindung;

Fig. 2

einen Querschnitt des Druckwerks der Fig. 1 mit einem freitragenden Gummituchzylinder gemäß vorliegender Erfindung;

Fig. 3

einen schematischen Querschnitt des Druckwerks der Fig. 1 mit einem freitragenden Gummituchzylinder und einem freitragenden Druckformzylinder gemäß vorliegender Erfindung;

Fig. 4

einen Querschnitt des Druckwerks der Fig. 1, worin der Druckformzylinder und der Gummituchzylinder zusätzlich durch eine an der zweiten Seitenwand montierte Platte gestützt werden;

Fig. 5

ein automatisches Registereinstellsystem gemäß vorliegender Erfindung;

Fig. 6

einen Druckformzylinder oder Gummituchzylinder mit zwei darauf angeordneten Hülsen;

Fig. 7

einen Druckformzylinder oder Gummituchzylinder mit vier darauf angebrachten Hülsen;

Fig. 8

einen Druckformzylinder, auf den drei hülsenförmige Druckformen angebracht sind und welcher einen Stift für die seitliche Registereinstellung aufweist;

Fig. 9

einen Druckformzylinder mit drei hülsenförmigen Druckformen und drei konischen Stiften für die seitliche Registereinstellung;

Fig. 10

eine Ansicht eines Stiftes und des zugehörigen Betätigungsmechanismus zum Bewegen des Stiftes.

Show it

Fig. 1

a side view of a satellite printing unit according to the present invention;

Fig. 2

a cross section of the printing of the Fig. 1 with a self-supporting blanket cylinder according to the present invention;

Fig. 3

a schematic cross section of the printing of the Fig. 1 with a self-supporting blanket cylinder and a cantilever printing plate cylinder according to the present invention;

Fig. 4

a cross section of the printing of the Fig. 1 wherein the printing form cylinder and the blanket cylinder are additionally supported by a plate mounted on the second side wall;

Fig. 5

an automatic register setting system according to the present invention;

Fig. 6

a printing form cylinder or blanket cylinder with two sleeves arranged thereon;

Fig. 7

a printing form cylinder or blanket cylinder with four sleeves mounted thereon;

Fig. 8

a printing form cylinder, are mounted on the three sleeve-shaped printing plates and which has a pin for the lateral register setting;

Fig. 9

a printing form cylinder with three sleeve-shaped printing plates and three conical pins for the lateral register setting;

Fig. 10

a view of a pin and the associated actuating mechanism for moving the pin.

Fig. 1 shows a satellite printing unit 1, the z. B. is used in web-fed rotary printing press for newspaper printing. It comprises a located in the middle of the printing unit 1 central impression cylinder 2 and four employee to the central impression cylinder 2 and standing in contact with this blanket cylinder 4. The printing unit further comprises four printing form cylinder 6, which are employed in accordance with the respective blanket cylinder 4. Each plate cylinder is further in contact with a respective inking unit 8 having inking rollers 9. The ratio of the circumference of the central impression cylinder to the blanket cylinders may be, for example, 2: 1, 4: 1, or any integer multiple. Although Fig. 1 only one inking unit 8 shows, it should be understood that for each printing forme cylinder 6, a respective inking unit 8 is present. Each inking unit 8 performs the associated printing forme cylinder 6 a different color, so that in the in Fig. 1 illustrated printing unit 1 four different colors, eg. As black, magenta, cyan and yellow can be printed on the web 12. Of course could the printing unit 1 alternatively for the printing of a fifth color, z. As gold or other special color can be configured by additionally a printing form cylinder 6, a blanket cylinder 4 and an inking unit 8 is arranged on the impression cylinder 2.

Other colors can be added by dividing the inking units so that one inking unit can print two colors at once. If z. For example, if the web 12 is wider than one side of the printed product, each of the forme cylinders may have a plurality of inking units associated therewith, each inking unit feeding ink to another page or group of pages of the printed product. Each printing forme cylinder 6 is associated with a dampening unit 10. In wet offset printing, the dampening units 10 supply fountain solutions to the printing plates. When using the printing unit 1 for the dry offset printing and the waterless or "single fluid" pressure the dampening units 10 are not required. If the printing unit 1 is used exclusively for the dry offset printing, can be completely dispensed with the dampening 10.

The web 12 is guided through an upper inlet into the printing unit 1, guided around a central impression cylinder 2, guided by the printing gap formed by the blanket cylinders 4 and the central impression cylinder 2 and leaves the printing unit 1 through the upper inlet. Of course, the web 12 can also be led from the left, from the right or from below into the printing unit 1 and leave this in any desired direction. For some print jobs, it may, for. B. be desired that the web from another direction to the printing unit 1 expires as it enters the printing unit. To change the path of the web after it has left the last blanket cylinder, z. As a driven by compressed air, mechanically or otherwise actuated guide roller for a change in direction of the web are used, without causing the printed image is smeared on the web.

Fig. 2 shows the satellite printing of the Fig. 1 with cantilevered blanket cylinders 4 and with pressure cylinders 6, which are mounted at both ends.

Fig. 3 shows the satellite printing of the Fig. 1 Cylinder 2, 4, 6 and the ink rollers 9 are arranged in a housing 14, which comprises a first and second housing portion respectively formed by side walls 14a and 14b.

As in the Fig. 2 and 3 The cylinders 2, 4 and 6 are respectively directly driven by an electric motor 16, 18, 20 and the drive shafts connected to the cylinders. The motors 16, 18, 20 are connected to a central control unit 21 of the printing unit 1, which preferably controls the speed of each motor 16, 18, 20 individually. However, the cylinders 2, 4, 6 can alternatively also be driven by a common drive system. For example, all the cylinders 2, 4, 6 could be driven by a central engine via conventional shafts and gearboxes, a gear train or a belt and drive shaft drive (not shown).

According to a first embodiment of the present invention, the central impression cylinder 2 is rotatably mounted in the first and second side walls 14a, 14b of the housing 14 by means of first and second cylinder pins 22a, 22b in associated bearings provided in the respective side walls 14a, 14b are arranged. The portion of the second side wall 14b supporting the second cylinder pin 22b of the central impression cylinder 2 is formed by a support or support 24 which preferably extends downwardly from the upper end of the housing 14, as shown in Figs Fig. 1 . 2 and 3 is shown.

In the embodiment of Fig. 2 the blanket cylinder 4 is rotatably mounted and self-supporting, ie it is supported at all times only on one side. In Fig. 2 the blanket cylinder 4 is mounted with a cylindrical pin 26 in the first side wall 14a. The cylinder pin 26 is rotatably received in a pair of bearings 29 located in the side wall 14a. Alternatively, the two bearings 29 of the Fig. 2 be replaced by a single large storage. The plate cylinder 6 is provided with a first and second cylinder pin 28a and 28b and the associated Bearings mounted in the first and second side wall 14a and 14b of the housing 14. A printing forme 50 is radially applied to the printing forme cylinder 6 in a known manner, eg magnetically or by means of a gap in the printing forme cylinder. An opening 30 is provided in the second side wall 14b of the housing 14 to permit axial removal of a blanket 40.

In the in Fig. 3 In the embodiment of the present invention shown, the printing form cylinder 6 and the blanket cylinder 4 are cantilevered in the same manner in the first side wall 14a as described above in connection with the blanket cylinder 4. Both cylinders 4, 6 are received with a respective cylinder pin and the associated storage in the first side wall 14a. The opening 30 in the second side wall 14b is widened to allow axial removal of the printing form 50 and the blanket 40. According to this embodiment, the printing form 50 is designed so that it is suitable for axial sliding and removal, for. B in the form of a sleeve. Thus, the printing form 50 and the blanket 40 can be quickly and easily removed from the printing unit 1 by these are easily moved out of the housing 14 through the opening 30 in the second side wall 14b when the printing unit 1 is not in operation.

In order to improve the strength of the housing 14, the first side wall 14a of the housing 14 may be fully or partially reinforced, particularly in the portion where the cylinders 4 and 6 are cantilevered. In the Fig. 2 and 3 is z. For example, the side wall 14a is shown with an additional post 31 as a partial reinforcement to support the cantilevered cylinders.

According to the embodiment of the Fig. 4 are printing forme cylinder and blanket cylinder 4, 6 stored during the printing operation in both side frames 14a and 14b. During the change of the printing form 50, or the blanket 40 or in the parked state, however, the blanket cylinder 4 and / or the Druckformzylinger 6 are supported only in the side frame 14 a. That is why at the preferred embodiment of the invention, a side plate 32 mounted in the opening 30 and supported by the side frame 14b. The plate 32 has releasable clamps for attaching and releasing the cylinders 4, 6. In accordance with the present invention, bearings 33 can be permanently mounted in bearing housings on respective cylinder posts 26 b / 2 and 28 b / 2 and the releasable clamps configured to receive the bearing housings fasten and release. Alternatively, the bearings may be permanently mounted in the plate 32 and the releasable clamps configured to secure and release the respective cylindrical pins. The plate 32 is preferably pivotable about an axis extending vertically by an actuator to automatically open and close the aperture 30. Such a plate 32 with releasable clamps is shown in detail in FIG US 5,241,905 described.

According to a further embodiment of the present invention, the blanket 40 is formed on the blanket cylinder 4 as a gapless sleeve, preferably in the US 5,323,702 described way. In order to easily apply the sleeve-shaped blanket 40 to the blanket cylinder 4, at least one set of openings 42 is arranged around the peripheral surface of the blanket cylinder 40; These openings 42 are connected via a valve 46 to a compressed air source 44. The valve 46 is in turn actuated by the central control unit 21. After the printing unit is stopped, the control unit 21 actuates the valve 46, and it is supplied through the openings 42 of compressed air from the compressed air source 44, whereby the blanket sleeve 40 is stretched. In the stretched state, the blanket can be easily removed from the blanket cylinder 4 by the opening formed in the side wall 14b of the printing unit. Fig.2 shows z. B. three sets of openings 42 over the length of the cylinder. 4

In a further embodiment of the present invention, the printing forms 50 applied to the printing form cylinder 6 are formed as sleeves. The attachment of the sleeve-shaped printing plate 50 can be carried out in the same manner as described above for the blanket 40. Thus, the printing form 50 is installed and removed by the opening formed in the side wall 14b of the printing unit 1. through A valve 56 operated by the central control unit 21 supplies compressed air from the compressed air source 44 through openings 52 located in the peripheral surface of the plate cylinder 6.

In accordance with another embodiment of the present invention, a plurality of sleeve-shaped blankets or dies 40, 50 may be mounted on each blanket or impression cylinder 4, 6. The apertures 42, 52 are arranged so that at least one set of apertures 42, 52 are under a respective blanket or print form 40, 50 as they are pushed or removed from the cylinders 4, 6. Therefore, the distance between the apertures 42, 52 is selected to be slightly less than the width of the respective blankets or dies 40, 50 between two sets of apertures 42, 52.

According to a preferred embodiment of the present invention, the openings 42, 52 are arranged in such a way that when applied to the cylinders 4, 6 or when removing them, at least two sets of openings 42, 52 under a respective blanket or printing sleeve 40, 50 are located. The distance of the openings 42, 52 from each other is chosen so that it is slightly less than half the width of the respective blankets or printing plates 40, 50 between two sets of openings.

According to the in Fig. 5 shown embodiment of the present invention, an automatic register setting system 60 is provided for sleeve-shaped printing plates 50, which allows automatic register adjustment while the printing unit 1 and when stationary printing unit. As in Fig. 5 shown, the system 60 comprises an electric motor 62, preferably a stepping motor, the z. B. is controlled by the central control unit 21 of the printing unit 1. When the compressed air system is activated and the printing plate is in its stretched condition, the motor 62 is controlled so that the sleeve-shaped printing plate 50 is automatically rotated by a wheel 66 which contacts the outer surface of the printing plate 50. The automatic register setting system 60 further comprises connected to the control unit 21 first sensor 68 for sensing the position of the printing form 50, e.g. B for detecting a located on the printing plate 50 first mark 70, which is preferably placed at one end of the printing plate 50. In addition, according to a further embodiment of the invention, the amount of compressed air supplied through the openings 52 is less than the pressure required for the axial removal of the printing plate 50 compressed air, but sufficient to overcome the friction between the printing plate 50 and the plate cylinder 6 and an automatic register setting to reach.

With the control unit 21, a second sensor 69 is further connected for sensing the position of the cylinder 6, for. For detecting a second mark 71 located on the cylinder 6. The second mark 71 provides a reference position to which the first mark 70 is set, and the correct register setting becomes a desired deviation of the first mark 70 from the second mark 71 Are defined. The register adjustment system 60 may be configured, for example, in the manner that it rotates the first mark 70 at an angle of, for example, 60 °. B. 0 °, 45 ° or 90 ° before the second mark 71 holds.

The first and second sensors 68, 69 may be of known design, e.g. As optical sensors or proximity switches. In addition, the first sensor and second sensor need not be of the same type.

In the illustrative example described below, the register setting system 60 is designed so that a zero-degree deviation of the first mark from the second mark is defined as the correct register setting. An operation for obtaining a circumferential register setting during the standstill of the printing unit proceeds as follows: First, the cylinder 6 is rotated until the second sensor detects that the second mark 71 has reached the desired reference position. Then, the compressed air is turned on to stretch the printing plate 50, and the control unit 21 drives the electric motor 62 until the first sensor 68 detects the first mark 70 and shuts off the compressed air. After switching off the compressed air shrinks Printing form and clamped on the cylinder 6 firmly. The automatic register setting system 60 makes it possible to register one, two or more printing forms 50 applied to a cylinder 6 when a corresponding number of electric motors 62, wheels 66, sensors 68, 69 and markers 70, 71 are provided. As in Fig. 5 shown, each sleeve-shaped printing plate 50 associated openings 52 of the printing forme cylinder 6 can be connected via individually actuated valves 56 to the compressed air source 44, so that the registration of the printing plates 50 can be made individually.

A process for register setting during the machine run is z. B. following: First, the blanket cylinder 4 is turned off by the plate cylinder 6. Then the compressed air is turned on and the pressure sleeve 50 is stretched while the cylinders 4, 6 are still rotating. Thereafter, by the electric motor 62, first, the printing form sleeve 50 is rotated at the same speed and in the same direction as the printing form cylinder 6, so that there is substantially no relative speed difference between the printing form sleeve 50 and the plate cylinder 6. Thereafter, the control unit 21 monitors the output of the first and second sensors 68, 69. If the control unit 21 detects a time difference between the signal generation, i. H. Upon the triggering of the first and second sensors 68, 69, the speed of the motor 62 is reduced or increased until the time difference is eliminated. By using a stepping motor 62 controlled by the control unit 21, the reduction or increase in the speed of the stepping motor 62 can be achieved by increasing or decreasing the number of steps per second, respectively.

According to the in the 6 and 7 shown embodiment, two or more blankets 40 or printing plates 50 may be mounted on a single blanket cylinder 4 or plate cylinder 6. With two or more printing plates 50 on the printing form cylinder, a change from one printing job to another can take place quickly and efficiently. This is especially useful for newspaper printing where frequent image changes are required. When using two or more rubber blankets 40 on a blanket cylinder, it is possible to replace them periodically. The replacement of blankets 40 is recommended for. For example, if a blanket has printed one and the same image for a long time. Replacing the blankets will print on different sections of the blanket, increasing print quality and extending the life of the blanket. In addition, if the blankets are damaged only in one section of the blanket cylinder, the damaged rubber blanket can be replaced, while the other blankets can remain in position on the cylinder 4. If z. For example, if a single blanket is used, a defect on one side of a 97 cm (38-inch) wide web requires the replacement of a blanket of 97 cm. However, if two 48.5 cm (19 inch blankets) blankets are used, a defect on one side of the web requires only one blanket of 48.5 cm width to be replaced, thereby reducing the cost of damage.

According to one in the Fig. 8 . 9 and 10 A further embodiment of the invention, which has a lateral register setting of one, two or more printing plates 50 (for example, the one shown in FIGS Fig. 8 and 9 shown three printing plates 50a, 50b, 50c), 6 pins 80 are also arranged on at least one end of the printing forme cylinder. The in Fig. 8 The pin 80 shown is preferably a straight pin which is located at the end of the printing forme cylinder 6 mounted in the housing 14a. This pin 80 allows a precise stop and a precise positioning of the printing forme 50a and a lateral registration of the printing forme 50a when it is rotated by the electric motor 62a of the register setting system 60 when the printing forme 50 is applied to the printing forme cylinder 6.

In the in Fig. 8 Furthermore, a second pin 82 can be provided, which can be arranged in a hole / bore located in the surface of the printing cylinder 6 and can be moved radially out of the hole 84 by an actuating mechanism 86. The actuating mechanism 86 may, for. As a pneumatic cylinder, a Magnetic coil drive / solenoid or a manually activated lever mechanism that moves the pin 82 out of the hole 84 after a single printing form 50 or more printing plates 50, z. B. the printing plates 50a, 50b, 50c, have been moved to the printing form cylinder 6. In the preferred embodiment of the invention, the head end of the pin 82 is preferably of conical or tapered shape and the respective end portion of the printing form 50 or 50c partially covers the hole 84 in such a manner that the printing form 50 or 50c automatically moves further onto the printing form cylinder becomes while the pin 82 moves out of the hole 84 until the movement of the printing forme is stopped by the arranged at the other end of the plate cylinder 6 first pin 80. A corresponding hole may be provided in the blanket cylinder to receive the extending pin 82. Thus, the page register of the printing form sleeves 50 is precise and easily adjustable. In this embodiment of the invention, the contiguous edges of the adjacent printing plates 50, e.g. B. the printing plates 50a, 50b, 50c of Fig. 8 Edge-to-edge, so that the side register of the sleeves 50a, 50b, 50c is adjusted only by the straight pin 80 and and the conical pin 82.

According to another, in Fig. 9 shown embodiment of the invention are between two adjacent printing plates 50, z. For example, the printing forms 50a and 50b or 50b and 50c, additional pins 90, 92 are provided to individually adjust the page register of each printing form 50a, 50b, 50c. The pins 90, 92 are preferably of similar construction and are actuated in the same manner as the pin 82 to provide lateral movement of the contiguous printing forms.

In addition, the pin 80 may also be movably disposed in a respective hole in the printing form cylinder and individually controlled by an actuating mechanism 86 to achieve lateral movement of the contiguous printing forms.

Although the pins 80, 82, 90, 92 are preferably conical, they can also be arbitrarily different, z. B. cylindrical, rectangular or octagonal shaped.

The actuating mechanisms 86 are preferably controlled by the central control unit 21 of the printing machine and can be supplied by the compressed air source 44 in the presence of pneumatic cylinders. When the one or more printing plates 50 are pushed onto the cylinder 6, the pins 82, 90, 92 are completely retracted into their respective holes 84 by the actuating mechanism 86, and are moved out of them again after the compressed air sleeves 50a, 50b , 50c have been moved to the cylinder 6. According to a further embodiment of the invention, the pressure molds have notches at their ends, in which the conical pins 82, 90, 92 are received.

While the mechanisms for controlling circumferential and lateral registration in the above embodiments have been described in the context of a satellite printing unit having a central impression cylinder, this does not exclude that these mechanisms can be used in printing units without a central impression cylinder.

LIST OF REFERENCE SIGNS

1

Satellite printing unit

2

Impression cylinder

4

Blanket cylinder

6

Plate cylinder

8th

inking

9

ink rollers

10

dampening

12

train

14

casing

14a

Side wall of the housing 14

14b

Side wall of the housing 14

16

electric motor

18

electric motor

20

electric motor

21

central control unit

22a

Cylinder pin (impression cylinder 2)

22b

Cylinder pin (impression cylinder 2)

24

support

26

Cylinder pin (blanket cylinder 4)

26b / 2

Cylinder pin ( Fig. 4 )

28a

Cylinder pin (forme cylinder 6)

28b

Cylinder pin (forme cylinder 6)

28b / 2

Cylinder pin ( Fig. 4 )

29

Storage of the cylinder pin 26th

30

Opening the side wall 14b

31

support

32

Side plate in the opening 30

33

overlays

40

Blanket (gapless sleeve)

42

Openings of the blanket cylinder 4

44

Compressed air source

46

Valve

50

sleeve-shaped printing form

50 a, b, c

sleeve-shaped printing forms ( Fig. 8 )

52

Openings of the printing forme cylinder 6

56

Valve

60

Registereinstellsystem

62

electric motor

62a

electric motor ( Fig. 9 )

66

wheel

68

first sensor

69

second sensor

70

first brand

71

second brand

80

first pen

82

second pen ( Fig. 8 )

84

hole

86

actuating mechanism

90

Pen ( Fig. 8 )

92

Pen ( Fig. 8 )

Claims (11)

1. Printing unit for a web-fed rotary printing press, comprising the following features:

   a housing (14) having a first and a second housing portion (14a, 14b), at least two rubber blanket cylinders (4) which are mounted by means of their first cylinder journal (26) in the first housing portion (14a) so as to be cantilevered when the printing unit (1) is not in operation, the rubber blankets of the rubber blanket cylinders (4) being in the form of rubber blanket sleeves (40) pushable axially onto the rubber blanket cylinder (4), and having at least two print form cylinders (6) each of which is associated with a rubber blanket cylinder (4), wherein each print form cylinder (6) has a sleeve-like print form (50) mounted axially thereon, and for mounting the sleeve-like print forms (50) axially on the print form cylinder (6) or for removing them therefrom the sleeve-like print forms (50) are expanded by means of compressed air, which is supplied through apertures (52) arranged along the circumferential surface of the print form cylinder (6),

   characterized by a central impression cylinder (2) around at least part of which the web being printed is wound and which is rotatably mounted by means of its first cylinder journal (22a) in the first housing portion (14a) and by means of its second cylinder journal (22b) in the second housing portion (14b), and

   characterized in that the rubber blanket cylinders are positioned against the central impression cylinder (2), and that the printing unit also comprises a register adjustment system (60) by means of which, during expansion of the print form (50) by means of air pressure, the circumferential position of the print form (50) with respect to the print form cylinder (6) is adjusted automatically.
2. Printing unit according to claim 1,
   characterized in that
   the print form cylinders (6) are mounted in the first housing portion (14a) so as to be cantilevered when the printing unit (1) is not in operation.
3. Printing unit according to any one of the preceding claims,
   characterized in that
   during operation of the printing unit (1) the rubber blanket cylinders (4) are rotatably mounted both in the first housing portion (14a) and in the second housing portion (14b).
4. Printing unit according to any one of the preceding claims,
   characterized in that
   during operation of the printing unit (1) the print form cylinders (6) are rotatably mounted both in the first housing portion (14a) and in the second housing portion (14b).
5. Printing unit according to claim 1,
   characterized in that
   the rubber blanket cylinders (4) are mounted so as to be cantilevered during operation of the printing unit (1).
6. Printing unit according to any one of claims 2 to 5,
   characterized in that
   the print form cylinders (6) are mounted so as to be cantilevered during operation of the printing unit (1).
7. Printing unit according to claim 1,
   characterized in that
   for mounting the sleeve-like rubber blankets (40) axially on the rubber blanket cylinder (4) or for removing them therefrom the sleeve-like rubber blankets (40) are expanded by means of compressed air, which is supplied through apertures (42) arranged along the circumferential surface of each rubber blanket cylinder (4).
8. Printing unit according to claim 1,
   characterized in that
   the register adjustment system (60) for automatic adjustment of the circumferential register has a motor (62, 62a) and a wheel (66) driven by the motor (62, 62a), which wheel makes contact with and, in the expanded state, rotates an associated sleeve-like print form (50) for adjustment of the register.
9. Printing unit according to any one of the preceding claims,
   characterized in that
   on each of the print form cylinders (6) there is provided a first pin (80) for lateral alignment of the sleeve-like print forms (50).
10. Printing unit according to claim 9,
    characterized in that
    an automatic lateral register adjustment device is provided, comprising a further pin (82) which, at the end of the sleeve-like print form (50) opposite from the first pin (80), is arranged so as to be radially displaceable in a hole (84) in the print form cylinder (6) by means of an actuating mechanism (86) in such a way that it displaces the sleeve-like print form (50) in the axial direction on the print form cylinder (6) in order to adjust the lateral register.
11. Printing unit according to any one of the preceding claims,
    characterized in that
    the central impression cylinder (2) is held in the second housing portion (14b) of the housing (14) by means of a support (24) which extends downwards from above the central impression cylinder (2).

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