EP0782919A1 - Printing unit for a rotary web printing machine - Google Patents

Abstract

The printing mechanism has a central counter-pressure cylinder supported by both sections (14a,14b) of the printing machine housing (14), via respective cylinder pins (22a,22b) and contacted by at least 2 rubber wetting rollers (4) with associated printing plate cylinders (6). The wetting rollers and/or the printing plate cylinders are supported by floating bearings at one end, when the printing machine is at a standstill, to facilitate replacement of the wetting roller sleeves or the printing plates.

Description

The present invention relates to a printing unit for a roller rotary printing press.

No. 5,127,322 describes a web-fed rotary printing press with a satellite printing unit, which has a central impression cylinder and four associated blanket cylinders, a respective plate cylinder being positioned on each blanket cylinder. A web is led down into the printing unit, wound around the central impression cylinder and led upwards out of the printing unit. A movable robot arm is provided for changing the printing plates attached to the plate cylinder. The system is designed for quick replacement of printing plates.

US 5, 323, 702 discloses a sleeve-shaped printing blanket for a blanket cylinder in an offset printing machine. The sleeve-shaped rubber blanket is applied axially to a blanket cylinder and removed from it in the same way. Conventional blankets and cylinders that have a gap or channel that passes through the printing gap 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, which adversely affects the print quality. With a gapless sleeve-shaped rubber 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 - and without overheating.

EP 0 225 509 B1 discloses an apparatus for indirect printing on a web, which comprises a printing mechanism with three cylinders, the ends of which are mounted in the two side walls of a printing machine. The plate cylinder and the blanket cylinder each have interchangeable sleeves.

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

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

Since the blanket cylinders are supported in a self-supporting manner during setup, sleeve-shaped blankets can be axially applied to the blanket cylinder and removed from it in the same way. This shortens the set-up time compared to the conventional clamping of flat rubber blankets. In addition, since the sleeve-shaped rubber blanket has no gap in its outer surface, the vibrations and / or shocks that normally occur are eliminated when the rubber blanket cylinder rotates and the gap is moved through the pressure gap between the plate cylinder and the rubber blanket cylinder. Thus, compared to conventional satellite printing machines and the conventional flat rubber blankets used, the wear and tear of machine parts and printing defects caused by the aforementioned vibrations and shocks is reduced, and machine speeds of, for example, 914 m (3000 feet) per minute can be achieved.

Access to the printing unit during setup is also made easier by the use of a self-supporting blanket cylinder.

According to a second exemplary embodiment of the present invention, the plate cylinder is likewise supported in a self-supporting manner in the first housing section during the setting up. This enables the use of sleeve-shaped printing plates which can be quickly and easily applied axially to the plate cylinder and removed from it in the same way. This results in an even easier access 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 there is no unprinted area between two successive sides of a printed web. So if the printing form consists of a flat plate, the opposite ends of which 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, then there is no unprintable area on the web.

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

According to a further exemplary embodiment of the present invention, the sleeve-shaped printing plates and / or the sleeve-shaped rubber blankets are stretched by means of compressed air which is supplied through openings in the outer circumferential surface of the printing plate cylinder and / or the rubber blanket cylinder, around the printing plates and / or rubber blankets on the respective ones Apply or remove cylinders.

According to a further embodiment of the invention, a side register setting system is provided, by means of which a lateral position of the printing form with respect to the printing form cylinder is automatically set during the expansion of the printing form by air pressure. For this purpose, a first pin is provided at the first end of each printing form cylinder in order to laterally adjust the sleeve-shaped printing forms on the printing form cylinders. Furthermore, the side register adjustment system preferably comprises a second pin at the second end of each printing form cylinder, each second pin being movably mounted in a bore in the printing form 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. It can further be provided that further pins are arranged along the outer circumferential surface of each printing forme cylinder in order to position a multiplicity of sleeve-shaped printing forms on each printing form cylinder in the axial direction, wherein the further pins can be movably mounted in respective further bores formed in each printing form cylinder and a respective actuating device is connected to it in such a way that each of the further pins is preferably individually controllable.

According to this embodiment of the invention, a printing unit with an automatic page register adjustment system comprises the following features:
a printing plate cylinder with a sleeve-shaped printing plate attached thereon, a first pin attached to a first end of the outer surface of the printing plate cylinder and a second pin attached to the second end of the outer surface of the printing plate cylinder, the second pin being movably mounted in a bore formed in the printing plate cylinder and there are a large number of openings in the outer surface of the printing form cylinder,
a sleeve expansion mechanism connected to the printing form cylinder, through which compressed air is guided through the plurality of openings in order to radially expand the printing form, and an actuating device connected to the second pin, through which the second pin is moved radially into and out of the bore to adjust the side register of the printing form.

Furthermore, a multiplicity of printing forms can be attached to the printing form cylinder and further pins can be provided along the outer peripheral surface of the printing form cylinder, each of the further pins being arranged movably in respective further bores formed in the printing form cylinder. The printing unit can further comprise a respective actuating device assigned to each additional pin and a control unit connected to the actuating devices, 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 controls their respective holes individually via the assigned actuators.

According to a last exemplary embodiment of the present invention, a system for automatically setting the circumferential register of the printing unit is provided. An electric motor rotates a wheel which is in contact with the outer peripheral surface of the sleeve-shaped printing form, while the latter is expanded by compressed air and is thereby freely rotatable on the peripheral surface of the associated cylinder. Due to the rotation of the wheel controlled by the electric motor on the peripheral surface of the sleeve-shaped printing form, the printing form is rotated around the printing form cylinder until the register register is accurate or in register.

According to this embodiment of the invention, an offset printing unit preferably comprises the following features:
a printing form cylinder with a sleeve-shaped printing form attached to it, 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 openings to radially expand the printing form;
a motor with a wheel mounted thereon that contacts the printing form when it is in its stretched state, a first sensor for scanning the first mark, which is arranged next to the printing form cylinder, a second sensor for scanning the second mark, which is arranged next to the printing form cylinder, a control unit with a first input assigned to the first sensor, a second input assigned to the second sensor, and an output assigned to the motor, the control unit controlling the circumferential position of the printing form relative to the printing form cylinder on the basis of the signals received from the first and second sensors.

The features and advantages of the present invention are explained in more detail in the following description of preferred exemplary embodiments 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 unit of Figure 1 with a cantilevered blanket cylinder according to the present invention.

Fig. 3

a schematic cross section of the printing unit of Figure 1 with a cantilevered blanket cylinder and a cantilever printing form cylinder according to the present invention.

Fig. 4

a cross section of the printing unit of Figure 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 attached to it;

Fig. 8

a printing form cylinder on which three sleeve-shaped printing forms are attached and which has a pin for lateral register adjustment;

Fig. 9

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

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 presses for newspaper printing. It comprises a central impression cylinder 2 located in the center of the printing unit 1 and four blanket cylinders 4 placed on and in contact with the central impression cylinder 2. The printing unit further comprises four printing form cylinders 6, which are positioned accordingly on the respective blanket cylinders 4. Each printing form cylinder is also in contact with a respective inking unit 8 which has inking rollers 9. The ratio of the circumference of the central impression cylinder to the blanket cylinders can be, for example, 2: 1, 4: 1 or any integer multiple. 1 shows only one inking unit 8, it should be understood that there is a respective inking unit 8 for each printing form cylinder 6. Each inking unit 8 leads the assigned printing form cylinder 6 to a different color, so that in the printing unit 1 shown in FIG. 1 four different colors, e.g. B. Black, magenta, cyan and yellow can be printed on the web 12. Of course the printing unit 1 could alternatively be used for printing a fifth color, e.g. B. gold or another special color can be arranged by additionally arranging a printing form cylinder 6, a blanket cylinder 4 and an inking unit 8 on the impression cylinder 2.

Additional colors can be added by dividing the inking units so that an inking unit can print two colors at once. If e.g. B. web 12 is wider than one side of the printed product, each printing form cylinder can have several inking units assigned to it, each inking unit supplying ink to a different side or group of sides of the printed product. A dampening unit 10 is assigned to each printing form cylinder 6. In wet offset printing, the dampening units 10 supply dampening solution to the printing plates. When using the printing unit 1 for dry offset printing and waterless or "single fluid" printing, the dampening units 10 are not required. If the printing unit 1 is used exclusively for dry offset printing, the dampening units 10 can be dispensed with entirely.

The web 12 is guided through an upper inlet into the printing unit 1, passed around a central impression cylinder 2, through the printing nip 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 guided from the left, from the right or from below into the printing unit 1 and leave it in any desired direction. For some print jobs, e.g. B. be desired that the web runs out of a different direction on the printing unit 1 than it enters the printing unit. In order to change the path of the web after it has left the last blanket cylinder, e.g. B. can be used by compressed air, mechanically or in any other way deflecting roller for a change of direction of the web without the print image being smeared on the web.

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

Fig. 3 shows the satellite printing unit of Fig. 1 with cantilevered blanket cylinders 4 and printing form cylinders 6. The cylinders 2, 4, 6 and the inking rollers 9 are arranged in a housing 14 which has a first and second housing section formed by side walls 14a and 14b, respectively includes.

As shown in FIGS. 2 and 3, cylinders 2, 4 and 6 are each driven directly by an electric motor 16, 18, 20 and the drive shafts connected to the cylinders, respectively. 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 be driven by a common drive system. For example, all of the cylinders 2, 4, 6 could be driven by a central motor via conventional shafts and gear housings, a gear train, or a belt and drive shaft drive (not shown).

According to a first exemplary embodiment of the present invention, the central counter-pressure cylinder 2 is rotatably mounted in the first and second side walls 14a, 14b of the housing 14, specifically by means of a first and second cylinder journal 22a, 22b in associated bearings, which are in the respective side walls 14a, 14b are arranged. The part of the second side wall 14b which supports the second cylinder pin 22b of the central counter-pressure cylinder 2 is formed by a support or support 24 which preferably extends downwards from the upper end of the housing 14, as shown in FIGS. 1, 2 and 3 is.

In the embodiment of FIG. 2, the blanket cylinder 4 is rotatably and self-supporting, that is, it is supported only on one side at all times. In Fig. 2 the blanket cylinder 4 is supported with a cylinder 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 FIG. 2 can be replaced by a single large bearing. The printing form cylinder 6 is provided with first and second cylinder journals 28a and 28b and the associated ones Bearings stored in the first and second side walls 14a and 14b of the housing 14. A printing form 50 is applied radially to the printing form cylinder 6 in a known manner, e.g. B. magnetically or by means of a gap in the printing form cylinder. An opening 30 is provided in the second side wall 14b of the housing 14 to enable an axial removal of a rubber blanket 40.

In the exemplary embodiment of the present invention shown in FIG. 3, the printing plate cylinder 6 and the blanket cylinder 4 are supported in the first side wall 14a in the same manner as described above in connection with the blanket cylinder 4. Both cylinders 4, 6 are received in the first side wall 14a with a respective cylinder journal and the associated bearing. The opening 30 in the second side wall 14b is widened to enable the printing form 50 and the rubber blanket 40 to be removed axially. 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 simply moving them 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 can be fully or partially reinforced, in particular in the section where the cylinders 4 and 6 are cantilevered. 2 and 3 is such. B. the side wall 14a shown with an additional support 31 as a partial reinforcement to support the cantilevered cylinders.

According to the exemplary embodiment in FIG. 4, printing form cylinders and blanket cylinders 4, 6 are mounted in both side frames 14a and 14b during printing operation. 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 printing form cylinder 6 are only supported in the side frame 14a. Therefore at the preferred embodiment of the invention, a side plate 32 is mounted in the opening 30 and supported by the side frame 14b. The plate 32 has releasable clamps for fastening and releasing the cylinders 4, 6. According to the present invention, bearings 33 can be permanently attached to the respective cylinder journals 26 b / 2 and 28 b / 2 in bearing housings, and the releasable clamps can be designed in such a way that they support the bearing housing attach and release. Alternatively, the bearings can be permanently installed in the plate 32 and the removable clamps can be designed so that they fix and release the respective cylinder pins. The plate 32 is pivotable by an actuator, preferably about a vertically extending axis, to automatically open and close the opening 30. Such a plate 32 with releasable clamps is described in detail in US 5,241,905.

According to a further exemplary embodiment of the present invention, the blanket 40 on the blanket cylinder 4 is designed as a gapless sleeve, preferably in the manner described in US Pat. No. 5,323,702. In order to be able 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 to a compressed air source 44 via a valve 46. 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 compressed air is supplied through the openings 42 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 through the opening formed in the side wall 14b of the printing unit. Fig.2 shows z. B. three sets of openings 42 along the length of the cylinder 4th

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

According to a further exemplary embodiment of the present invention, a plurality of tubular rubber blankets or printing formes 40, 50 can be attached to each blanket or printing form cylinder 4, 6. The openings 42, 52 are arranged such that at least one set of openings 42, 52 is located under a respective rubber blanket or printing form 40, 50 while these are being pushed onto or removed from the cylinders 4, 6. Therefore, the distance between the openings 42, 52 is chosen so that it is slightly smaller between two sets of openings 42, 52 than the width of the respective rubber blankets or printing forms 40, 50th

According to a preferred exemplary embodiment of the present invention, the openings 42, 52 are arranged in such a way that when they are applied to or removed from the cylinders 4, 6, at least two sets of openings 42, 52 are located under a respective blanket or printing form sleeve 40, 50 are located. The spacing of the openings 42, 52 from one another is selected such that it is slightly less than half the width of the respective rubber blankets or printing forms 40, 50 between two sets of openings.

According to the exemplary embodiment of the present invention shown in FIG. 5, an automatic register setting system 60 for sleeve-shaped printing forms 50 is provided, which enables automatic register setting with the printing unit 1 running and with the printing unit at a standstill. As shown in Fig. 5, the system 60 includes an electric motor 62, preferably a stepper motor, e.g. B. is controlled by the central control unit 21 of the printing unit 1 When the compressed air system is activated and the printing form is in its stretched state, the motor 62 is controlled such that the sleeve-shaped printing form 50 by a wheel 66 which the outer surface of the printing form 50th contacted, automatically rotated. The automatic register setting system 60 further includes one connected to the control unit 21 first sensor 68 for sensing the position of the printing form 50, e.g. B. for detecting a first mark 70 located on the printing form 50, which is preferably placed at one end of the printing form 50. In addition, according to another embodiment of the invention, the amount of compressed air supplied through the openings 52 is less than the compressed air required for the axial removal of the printing form 50, but is sufficient to overcome the friction between the printing form 50 and the printing form cylinder 6 and an automatic register setting to reach.

A second sensor 69 for sensing the position of the cylinder 6 is also connected to the control unit 21, e.g. B. to detect 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 is considered a desired deviation of the first mark 70 from the second mark 71 Are defined. The register setting system 60 can, for example, be configured in such a way that it marks the first mark 70 at an angle of z. B. 0 °, 45 ° or 90 ° before the second mark 71 holds.

The first and second sensors 68, 69 can be of known design, for. B. optical sensors or proximity switches. In addition, the first sensor and the second sensor need not be of the same type.

In the illustration example described below, the register setting system 60 is designed such that a zero degree deviation of the first mark from the second mark is defined as the correct register setting. A process for obtaining a comprehensive register setting while the printing unit is at a standstill 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. The compressed air is then switched on to expand the printing form 50, and the control unit 21 drives the electric motor 62 until the first sensor 68 detects the first mark 70 and switches off the compressed air. After switching off the compressed air, the shrinks Printing form and jammed on the cylinder 6. The automatic register setting system 60 allows the register setting of one, two or more printing forms 50 applied to a cylinder 6 if a corresponding number of electric motors 62, wheels 66, sensors 68, 69 and marks 70, 71 are provided. As shown in FIG. 5, the openings 52 of the printing form cylinder 6 assigned to each sleeve-shaped printing form 50 can be connected to the compressed air source 44 via individually operable valves 56, so that the register setting of the printing forms 50 can be carried out individually.

A process for register setting while the machine is running is e.g. B. the following: First, the blanket cylinder 4 is switched off from the printing form cylinder 6. The compressed air is then switched on and the printing form sleeve 50 is stretched while the cylinders 4, 6 are still rotating. Thereafter, the printing form sleeve 50 is first rotated by the electric motor 62 at the same speed and in the same direction as the printing form cylinder 6, so that there is essentially no relative speed difference between the printing form sleeve 50 and the printing form cylinder 6. The control unit 21 then 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. After triggering the first and second sensors 68, 69, the speed of the motor 62 is reduced or increased until the time difference is eliminated. When using a stepper motor 62 controlled by the control unit 21, the reduction or increase in the speed of the stepper motor 62 can be achieved in each case by increasing or decreasing the number of steps per second.

According to the exemplary embodiment shown in FIGS. 6 and 7, two or more blankets 40 or printing formes 50 can be attached to a single blanket cylinder 4 or printing form cylinder 6. With two or more printing forms 50 on the printing form cylinder, a change from one printing job to another can take place quickly and efficiently. This is particularly helpful in newspaper printing, where a frequent change of the printed image is required.

When using two or more blankets 40 on a blanket cylinder, it is possible to replace them periodically. The exchange of rubber blankets 40 is recommended for. B. if a rubber blanket has printed the same image for a long time. By replacing the blankets, printing is carried out on other sections of the blanket, which increases the print quality and extends the life of the blanket. In addition, if the blankets are damaged only in a portion of the blanket cylinder, the damaged blanket can be replaced while the other blankets can remain in position on the cylinder 4. If e.g. For example, if a single blanket is used, a defect on one side of a 97 cm (38 inch) wide web will require the replacement of a 97 cm blanket. However, if two 48.5 cm rubber blankets (19 inch blankets) are used, a defect on one side of the web will require the replacement of only a 48.5 cm wide rubber blanket, thereby reducing the cost of the damage.

According to a further embodiment of the invention shown in FIGS. 8, 9 and 10, which has a lateral register setting of one, two or more printing forms 50 (e.g. the three printing forms 50a, 50b, 50c shown in FIGS. 8 and 9) provides, 6 pins 80 are also arranged on at least one end of the printing form cylinder. The pin 80 shown in FIG. 8 is preferably a straight pin which is located at the end of the printing form cylinder 6 mounted in the housing 14a. When the printing form 50a is applied to the printing form cylinder 6, this pin 80 enables a precise stop and precise positioning of the printing form 50a as well as lateral register adjustment of the printing form 50a, away from which it is rotated by the electric motor 62a of the register setting system 60.

In the exemplary embodiment shown in FIG. 8, a second pin 82 can also be provided, which can be arranged in a hole / bore located in the surface of the pressure cylinder 6 and can preferably be moved radially out of the hole 84 by an actuating mechanism 86. The actuating mechanism 86 can e.g. B. a pneumatic cylinder Solenoid drive / electromagnet 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 forms 50, e.g. B. the printing formes 50a, 50b, 50c have been moved onto the printing form cylinder 6. In the preferred embodiment of the invention, the head end of the pin 82 is preferably of a conical or tapered shape, and the respective end part of the printing form 50 or 50c partially covers the hole 84 in such a way that the printing form 50 or 50c automatically moves further onto the printing form cylinder while the pin 82 moves out of the hole 84 until the movement of the printing form is stopped by the first pin 80 arranged at the other end of the plate cylinder 6. A corresponding hole may be provided in the blanket cylinder to receive the extending pin 82. The side register of the printing form sleeves 50 is thus precise and easily adjustable. In this embodiment of the invention, the adjacent edges of the adjacent printing forms 50, e.g. B. the printing forms 50a, 50b, 50c of Fig. 8, edge-to-edge arranged so that the side register of the sleeves 50a, 50b, 50c is set only by the straight pin 80 and and the conical pin 82.

According to a further embodiment of the invention shown in FIG. 9, between two adjoining printing forms 50, e.g. B. the printing forms 50a and 50b or 50b and 50c, additional pins 90, 92 are provided to individually set the side register of each printing form 50a, 50b, 50c. The pins 90, 92 are preferably of the same construction and are actuated in the same manner as the pin 82 in order to achieve a lateral movement of the adjacent printing forms.

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

Although the pins 80, 82, 90, 92 are preferably conical, they can also be any other way, e.g. B. be cylindrical, rectangular or octagonal.

The actuation mechanisms 86 are preferably controlled by the central control unit 21 of the printing press 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 these again after the sleeves 50a, 50b, 50c have been moved onto the cylinder 6. According to a further embodiment of the invention, the printing formes have notches at their ends, in which the conical pins 82, 90, 92 are received.

Although the mechanisms for controlling the circumferential and lateral register setting in the above exemplary embodiments have been described in connection with a satellite printing unit with a central impression cylinder, this does not exclude that these mechanisms can also be used in printing units without a central impression cylinder.

LIST OF REFERENCES

1

Satellite printing unit

2nd

Impression cylinder

4th

Blanket cylinder

6

Printing form cylinder

8th

Inking unit

9

Ink rollers

10th

Dampening system

12th

train

14

casing

14a

Side wall of the housing 14

14b

Side wall of the housing 14

16

electric motor

18th

electric motor

20th

electric motor

21

central control unit

22a

Cylinder journal (impression cylinder 2)

22b

Cylinder journal (impression cylinder 2)

24th

support

26

Cylinder pin (blanket cylinder 4)

26b / 2

Cylinder journal (Fig. 4)

28a

Cylinder journal (printing form cylinder 6)

28b

Cylinder journal (printing form cylinder 6)

28b / 2

Cylinder journal (Fig. 4)

29

Bearing of the cylinder journal 26

30th

Opening the side wall 14b

31

support

32

Side plate in opening 30

33

Bearings

40

Rubber blanket (gapless sleeve)

42

Openings in 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 in the printing form cylinder 6

56

Valve

60

Register setting system

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 pin (Fig. 8)

84

hole

86

Operating mechanism

90

Pen (Fig. 8)

92

Pen (Fig. 8)

Claims (15)

Printing unit for a web-fed rotary printing press, which comprises the following features:
a housing (14) with a first and a second housing section (14a, 14b), a central impression cylinder (2) at least partially wrapped around by the web to be printed, which with its first cylinder pin (22a) in the first housing section (14a) and with its second cylinder journal (22b) is rotatably mounted in the second housing section (14b), at least two rubber blanket cylinders (4) attached to the central impression cylinder (2), which with their first cylinder journal (26) in the first housing section (14a) when the printing unit (1 ) are overhung, and with at least two printing form cylinders (6), each of which is assigned to a blanket cylinder (4). Printing unit according to claim 1,
characterized,
that the printing form cylinders (6) are overhung in the first housing section (14a) when the printing unit (1) is at a standstill. Printing unit according to one of the preceding claims,
characterized,
that the blanket cylinders (4) are rotatably supported both in the first (14a) and in the second housing section (14b) during operation of the printing unit (1). Printing unit according to one of the preceding claims,
characterized,
that the printing form cylinder (6) rotates during operation of the printing unit (1) both in the first housing section (14a) and in the second housing section (14b) are stored. Printing unit according to claim 1,
characterized,
that the blanket cylinders (4) are overhung during operation of the printing unit (1). Printing unit according to one of claims 2 to 5,
characterized,
that the printing form cylinders (6) are overhung during the operation of the printing unit (1). Printing unit according to one of the preceding claims,
characterized,
that the rubber blankets of the rubber blanket cylinders (4) are designed as rubber blanket sleeves (40) to be slipped axially onto the rubber blanket cylinder (4). Printing unit according to claim 7,
characterized,
that the sleeve-shaped blankets (40) are expanded by means of compressed air, which is supplied through openings (42) arranged along the circumferential surface of each blanket cylinder (4), in order to apply the sleeve-shaped blankets (40) axially to or from the blanket cylinder (4) to remove Printing unit for a web-fed rotary printing press, which comprises the following features:
a housing (14) with a first and a second housing section (14a, 14b), a central impression cylinder (2) with a first and a second cylinder journal (22a, 22b), the first cylinder journal (14a) in the first housing section (14a ) is rotatably supported and the second cylinder pin (22b) is rotatably supported in the second housing section (14b);
a web that is at least partially wound around the central impression cylinder (2),
at least two blanket cylinders (4), which are attached to the central impression cylinder (2); and
at least two printing form cylinders (6), each of which is attached to a respective one of the at least two blanket cylinders (4), each printing form cylinder (6) having a sleeve-shaped printing form (50) mounted axially thereon. Printing unit according to claim 9,
characterized,
that the sleeve-shaped printing plates (50) are expanded by means of compressed air which is supplied through openings (52) arranged along the circumferential surface of the printing plate cylinder (6), in order to apply the sleeve-shaped printing plates (50) axially to or from the printing plate cylinder (6) remove. Printing unit according to claim 10,
characterized,
that this further comprises a register setting system (60), by means of which a circumferential position of the printing form (50) with respect to the printing form cylinder (6) is automatically set during the expansion of the printing form (50) by air pressure. Printing unit according to claim 11,
characterized,
that the register setting system (60) for automatically setting the circumferential register has a motor (62, 62a) and a wheel (66) driven by the motor (62, 62a), which contacts an associated sleeve-shaped printing form (50) and in the stretched state for setting of the register twisted. Printing unit according to one of claims 9 to 12,
characterized,
that a first pin (80) is provided on each of the printing form cylinders (6) for lateral adjustment of the sleeve-shaped printing forms (50). Printing unit according to claim 13,
characterized,
that an automatic side register setting device is provided which comprises a further pin (82) which, on the side of the sleeve-shaped printing form (50) opposite the first pin (80), in a bore (84) in the printing form cylinder (6) via an actuating device ( 86) is arranged to be radially displaceable in such a way that it moves the sleeve-shaped printing form (50) in the axial direction on the printing form cylinder (6) in order to set the side register. Printing unit according to one of the preceding claims,
characterized,
that the central counter-pressure cylinder (2) is held in the second housing section (14b) of the housing (14) by means of a support (24) extending downwards from above the central counter-pressure cylinder (2).

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