EP0353194B1 - Device for tripping and adjusting inking system rollers or damping system rollers in a press - Google Patents

Description

The invention relates to a device for switching on and off and setting an inking or dampening roller of a printing press of the type specified in the preamble of claim 1.

Such devices are known from EP-PS 0 061 581 and DE-OS 33 42 853 and generally have a first adjusting element for adjustment with respect to a first friction roller mounted fixed in the machine frame and a second adjusting element for adjustment with respect a second, stationary roller in the machine frame or with respect to a forme cylinder of the printing machine.

The swiveling movement required for this takes place via pneumatically actuated cylinders. Even during the pivoting of the inking unit or dampening unit roller around the stationary, first distribution roller, the inking unit or dampening unit roller remains in constant contact with the first distribution roller. In order to enable an adjustment of the position of the inking unit or dampening unit roller, mechanical adjusting devices are arranged on the pivoting levers, by means of which the inking unit or dampening unit roller can be adjusted in the radial direction with respect to the first distribution roller.

To adjust the inking unit or dampening unit rollers with respect to the second, fixedly mounted in the machine frame friction roller and in relation to the forme cylinder printing machine stops are provided which are mechanically adjustable. The swivel levers and the inking unit or dampening unit rollers mounted on them are pressed against these stops by pneumatic cylinders.

Since the swivel mechanisms have to be adjusted from a position that is outside the printing press, complex mechanical devices are required, in particular for the adjustment of the fixed stops.

In addition, the diagonal register must also be readjusted by adjusting the forme cylinder during printing. So that the inking unit or dampening unit rollers, which are in contact with the forme cylinder via the swivel levers pressed against the stops, do not have to be readjusted with every diagonal register adjustment of the forme cylinder, the intrinsically fixed stops are located on mechanical devices that the Adjust the inking unit or dampening unit rollers to the diagonal register adjustment of the forme cylinder. These mechanical devices are also very complex and complicated and also require additional space.

Since the inking unit or dampening unit rollers are arranged on swiveling levers which can be pivoted about the first distribution roller, the inking unit or dampening unit rollers are to be switched off from the second distribution roller or from the forme cylinder, i.e. swing away; however, the inking or dampening unit rollers are still in constant contact with the first distribution roller, which is disadvantageous when adjusting the inking unit or dampening unit roller with respect to the two adjacent rollers, but also when replacing inking unit or dampening unit rollers in so-called paper winders, that reach into the inking unit.

With such inking unit or dampening unit rollers, it is not possible to automatically eliminate external influences, such as, for example, the thermal expansion, which can change the original setting of the inking unit or dampening unit rollers, by tracking the actuators. Such readjustment would have to be done by hand and also reversed by hand. Such changes in the original setting of the inking or dampening unit rollers due to external influences during production can have an adverse effect on the print quality of the printed products.

Attempts have also already been made to press the inking unit or dampening unit rollers mounted on the swivel levers, which are actuated by means of pneumatic cylinders, directly onto the second distribution roller or the forme cylinder by omitting the stops described above. By changing the air pressure of the pneumatic cylinders, different pressures should be achieved on the respective rollers. However, this makes the entire system too unstable and can lead to vibrations of the rollers.

The invention has for its object to provide a simple and user-friendly device for starting and stopping and adjusting an inking or dampening roller of a printing press of the type specified, which allows remote adjustment with position feedback in at least one direction and easily adapted to the different operating conditions can be.

This object is achieved by the features specified in the characterizing part of claim 1.

Appropriate embodiments are defined by the features of the subclaims.

The advantages achieved with the invention are based on the following mode of operation: To adjust the adjustable rollers, the spindles can be adjusted for as long as possible, for example by hand using an appropriate key, until the adjustable rollers have the corresponding, stationary Touch roller. This position is stored in the programmable logic controller. At the same time, this position can also be assigned the value of the diameter of the adjustable roller. From this basic position of the adjustable roller, different, possibly required positions result for different types of production. The corresponding control values are in turn stored in the programmable logic controller. It is now possible to adjust all adjustable rollers of this type of production accordingly when working in a certain type of production.

During the production of a large number of the same printed products, the external conditions can change, for example the temperature. This can have the consequence that the setting of the inking unit or dampening unit roller is no longer optimal with respect to the adjacent, stationary rollers. A correction of the setting of the inking unit or dampening unit roller in relation to the adjacent, stationary rollers can only be carried out by temperature monitoring in a predetermined program in the programmable logic controller. This ensures consistent print quality throughout the production period.

Since the basic position explained above depends on the diameter of the adjustable roller, but this basic position is assigned the corresponding diameter of the adjustable roller as a parameter, you only have to enter the exact diameter of the new roller when changing the roller, which means that the correspondingly programmed, programmable logic controller controls the basic position for defines this new roller. The readjustment of the new roller is no longer necessary, since all previously entered different positions of the adjustable roller for the different production conditions are redefined by the programmable logic controller according to an existing program.

Since the first and second actuating elements, usually spindles, are located in roller locks on both sides of the inking unit or dampening unit roller, they require relatively little space and in particular do not hinder the adjustment of the rollers.

Such spindles are rotatably mounted in the housing of the roller lock and provided with a thread. The inking unit or dampening unit rollers, in whose bearing journals the spindles engage, can be very easily adjusted by rotating the spindles via a DC motor and a corresponding gear.

If the housing of the roller lock is attached to a swivel lever and the end of this swivel lever opposite the roller lock can be pivoted about the axis of the stationary distributor roller, the inking or dampening unit roller is adjusted in the radial direction with respect to the stationary distributor roller. The adjustment of the inking unit or dampening unit roller with respect to a second, stationary friction roller takes place by pivoting the pivot lever about the axis of the first, stationary distributor roller. The actuator designed as a spindle for pivoting the pivoting lever is rotatably attached to a steering lever, the other end of which is pivotally mounted on the machine frame. As a result, the inking or dampening unit roller can be adjusted with respect to the stationary, second friction roller without changing its position with respect to the first friction roller.

The position of the inking unit or dampening unit roller is recorded in the programmable logic controller by means of a potentiometer that is assigned to each actuator.

According to another embodiment, the housing of the roller lock is firmly connected to the machine frame. In this roller lock, two spindles serving as actuators are provided, which run approximately at right angles to one another and can bring the inking unit or dampening unit roller into any position within the defined adjustment range.

Both spindles are driven by DC motors; one of the two spindles is arranged so that it extends in an approximately tangential direction to the distribution roller or to the forme cylinder, which simplifies the control of the adjustment process. Because by adjusting the inking unit or dampening unit roller in the tangential direction with respect to the stationary distribution roller, the position with respect to this distribution roller changes very little within a predetermined range.

The potentiometer serving as a control value transmitter can be replaced by a pressure transducer, which provides a measured value for the starting pressure of the inking unit or dampening unit roller on the friction rollers or on the forme cylinder. By entering a predetermined contact pressure in the programmable logic controller, the position of the inking unit or dampening unit roller can be regulated automatically in relation to the corresponding stationary friction roller. Fluctuations in the contact pressure of the inking unit or dampening unit roller with respect to the stationary friction roller, as can occur in the course of a production, can thus be avoided, so that a constant print quality is guaranteed even over longer periods of time.

With this device, the inking unit or dampening unit rollers can be completely stopped by the two stationary rollers on which they are in contact; this brings in certain Operating situations Advantages, for example when a so-called "paper winder" occurs in the printing press, which extends into the inking unit. Eliminating this malfunction is considerably simplified when the inking unit or dampening unit roller is completely switched off; The original position of the inking unit or dampening unit roller can be achieved automatically by storing the corresponding control values in the programmable logic controller when production continues.

For adjusting the inking or dampening unit roller with respect to the adjacent, stationary rollers, for example friction rollers, e.g. the inking roller are dyed in order to then define the optimal position by positioning it on the corresponding, stationary roller and measuring the printing strip that is formed on it. This adjustment can be carried out more easily if the inking roller can be completely turned off by the two adjacent rollers.

• Fig. 1 ein schematisch dargestelltes Druckwerk einer Druckmaschine,
• Fig. 2 eine Darstellung der Anordnung des Walzenschlosses auf einem Schwenkhebel,
• Fig. 3 einen Schnitt längs der Linie V - V durch das Walzenschloß nach Fig. 2,
• Fig. 4 einen Schnitt längs der Linie VI - VI durch das Walzenschloß nach Fig. 3,
• Fig. 5 eine schematische Darstellung mit einem fest am Maschinengestell angeordneten Walzenschloß,
• Fig. 6 einen Schnitt längs der Linie VIII - VIII durch das Walzenschloß nach Fig. 7, und
• Fig. 7 einen Schnitt längs der Linie IX - IX durch das Walzenschloß gemäß Fig. 6.

The invention is explained below with reference to exemplary embodiments with reference to the accompanying schematic drawings. Show it:

• 1 is a schematically illustrated printing unit of a printing press,
• 2 shows the arrangement of the roller lock on a swivel lever,
• 3 shows a section along the line V - V through the roller lock according to FIG. 2,
• 4 shows a section along the line VI-VI through the roller lock according to FIG. 3,
• 5 shows a schematic illustration with a roller lock arranged fixedly on the machine frame,
• 6 shows a section along the line VIII-VIII through the roller lock according to FIG. 7, and
• 7 shows a section along the line IX-IX through the roller lock according to FIG. 6.

In Fig. 1, a printing unit for a printing press is shown schematically. Here, an ink fountain roller 2 is provided with an ink film by ink located in an ink fountain 1. A siphon roller 3 transfers ink from the ink fountain roller 2 to a first, stationary friction roller 4a. A first transfer roller 5a transfers the ink to a second distribution roller 4b. From there, the ink passes through second transfer rollers 5b to third, stationary rubbing rollers 4c, which in turn transfer the ink to inking rollers 6. A printing plate of a forme cylinder 7 is inked over the inking rollers 6. In a similar way, dampening solution passes from a dampening solution box 8 with a dampening solution box roller 9 via a lifting roller 10 to a stationary friction roller 11, from where the dampening solution is transferred to the pressure plate of the forme cylinder 7 by means of application rollers 12. Both the forme cylinder 7 and the friction rollers 4 and 11 are at least virtually stationary in the machine frame of the printing press during the production process. The transfer rollers 5 and the applicator rollers 6 and 12 are equipped with adjustment devices with which their position with respect to the stationary rollers with which they are in contact can be changed.

In Fig. 2, a stationary friction roller 4, an inking roller 6 and the forme cylinder 7 are shown schematically. A pivot lever 30 is rotatably mounted about the axis of rotation 31 of the friction roller 4. With this pivot lever 30, a roller lock 20, in which the inking roller 6 is rotatably mounted, is firmly connected. A bolt 32, which is fastened to a steering lever 33, projects into the roller lock 20, the steering lever 33 being connected in an articulated manner to a machine frame 34 via a pivot pin 37. The inking roller 6 is adjusted with respect to the friction roller 4 by shifting in the radial direction (arrow A) of the friction roller 4. The inking roller 6 is adjusted with respect to the forme cylinder 7 by pivoting the pivoting lever 30 (arrow B) with respect to the steering lever 33.

In such a device, the position of the inking roller 6 with respect to the rubbing roller 4 is preferably set first, this should be done when the inking roller 6 and thus the pivoting lever 30 is in the position set down by the forme cylinder 7. If the position of the inking roller 6 with respect to the friction roller 4 is set, the position of the inking roller 6 with respect to the forme cylinder 7 can be adjusted by pivoting the pivoting lever 30 in the direction of the forme cylinder 7. The setting of the inking roller 6 with respect to the friction roller 4 remains unchanged.

This device shown in FIG. 2 for setting the inking roller 6 with respect to the forme cylinder 7 or the friction roller 4 can also be used for the transfer rollers 5, the setting of these transfer rollers 5 with respect to two distribution rollers 4.

In Fig. 3 the roller lock 20 is shown in FIG. 2. The roller lock 20 has a housing 23. A first recess 22 is machined into this housing 23, into which a bearing pin 21 of the inking roller 6 projects. The jacket of the inking roller 6 is freely rotatable on the journal 21 via a roller bearing 39. The bearing pin 21 is provided with a flange 38, which the recess 22 of the housing 23 covers. The end of the bearing pin 21 protruding into the housing 23 of the roller lock 20 is provided with a threaded hole 24 arranged transversely to the central axis. A spindle 25 is screwed into this threaded hole 24 as an adjusting element. This spindle 25 is rotatably mounted in the housing 23, but secured against displacement. A gear 27 is connected in a rotationally fixed manner to the spindle 25. This gear 27 is connected via further gears to a potentiometer (19), not shown, and a drive (17, 18), not shown. The end of the bearing pin 21 protruding into the housing 23 of the roller lock 20 is provided with flats 40.

A further spindle 26 is arranged as a second actuating element in the housing 23 of the roller lock 21 approximately at right angles to the spindle 25. This spindle 26 is also rotatable and secured against displacement. This spindle 26 is screwed into a threaded hole 45 of the bolt 32. The bolt 32 penetrates the housing 23 of the roller lock 20 in a bore 35. A flange 41 arranged on the bolt 32 covers the bore 35 of the housing 23. The steering lever 33 is movably attached to an end pin 43 of the bolt 32. The other end of the steering lever 33 is also movably attached to the pivot pin 37, which is firmly connected to the machine frame 34.

On the spindle 26, a gear 44 is secured against rotation. This gear 44 meshes with a gear 29 which is attached to a potentiometer 19. Gear 28 is also engaged with gear 44. The gear 28 is mounted on the driven shaft of a gear 18 in a rotationally fixed manner. The transmission 18 is flanged to a DC motor 17 (see FIG. 4).

From Fig. 4 it can be seen how the spindle 26 is rotatably mounted in the housing 23 of the roller lock 20 and secured against displacement. Spindle 26 is screwed into the threaded hole 45 of the bolt 32. The bolt 32, which is provided with flats 46, projects through an opening 35 in the housing 23 into the roller lock 20. All movable parts of the roller lock 20 are completely closed on the one hand by the housing 23 and on the other hand by a cover 42, which prevents contamination.

Instead of arranging the roller lock on a swivel lever, it is also possible to firmly connect a part of the roller lock to the machine frame, as shown in FIGS. 6 and 7.

5 shows the two friction rollers 4a, 4b with the intermediate transfer roller 5b. The transfer roller 5b is adjusted in a straight line. Here, the two arrows 48 and 49, which correspond to the directions of the spindles 25, 26, indicate the directions in which the adjustment can be carried out. The angle between the two arrows 48 and 49 is 900. Advantageously, one of the two adjustment directions 48 or 49 is selected with respect to the corresponding friction roller 4a or 4b so that it practically has a tangent to the circumference of the friction roller 4a or 4b coincides. If the adjustment direction 48 is tangential to the rubbing roller 4a, the transfer roller 5b to the rubbing roller 4b can be adjusted in a small area without the settings of the transfer roller 5b with respect to the rubbing roller 4a noticeably changing.

6 and 7, a second embodiment of the subject matter of claim 1 is shown.

6, a bolt 52 provided with a base 51 is fixedly connected to the machine frame 60. The bolt 52 projects into a recess 61 in a housing 62 of a roller lock 63. A spindle 64 is screwed in through a threaded hole made in the bolt 52 and is rotatably arranged in the housing 62 and is secured against displacement. A guide pin 53 is inserted into the housing 62 parallel to the spindle 64 and is inserted in a hole 55 of the pin 52 provided with guides 54. This guide pin 53 serves to absorb forces and relieves the spindle 64. The spindle 64 is provided with a gear 65 which meshes again with the gear 74 shown in FIG. 7 of the drive 17, 18, not shown, and the gear 72 of a potentiometer 73 .

The other spindle 66 is arranged practically perpendicular to the spindle 64. This spindle 66 is inserted in a correspondingly arranged threaded hole 77 of an axle bolt 57 provided with a flange 56. The axle bolt 57 projects through a recess 67 into the housing 62 of the roller lock 63. A roller journal 58 of an adjustable roller is rotatably mounted in the flange 56. The housing 62 of the roller lock 63 is completely enclosed with a cover 68 and with rubber bellows 59.

As can be seen from FIG. 7, the roller journal 58 is rotatably supported in the flange 56 by roller bearings. The axle pin 57 protrudes into the roller lock 63 and is provided with a threaded hole into which the spindle 66 is screwed. The spindle 66 is equipped with a gear 69, which in turn meshes with the gear 76 shown in FIG. 6 of a drive 17, 18, not shown, and the gear 75 of a second potentiometer 70. Also picks up here Guide bolt 71 arising bending forces.

In order to adjust the adjustable rollers 5, 6 or 12, the spindles 25, 26, 64, 66 can be adjusted until the adjustable rollers 5, 6 or 12 touch the corresponding stationary roller. This position can be stored in a programmable logic controller. At the same time, this position can also be assigned the value of the diameter of the adjustable roller 5, 6 or 12. From this basic position of the adjustable roller 5, 6 or 12, different, required positions result for different types of production. The corresponding control values can in turn be stored in the programmable logic controller. This makes it possible to set all adjustable rollers 5, 6 or 12 of this type of production accordingly, based on a previously known type of production.

Claims (9)

1. Apparatus for applying and lifting off and adjusting an inking unit or dampening unit roller of a printing machine

a) having a first adjusting element for adjustment in relation to a first friction roller mounted fixed in a machine frame and

b) having a second adjusting element for adjustment in relation to a second friction roller, which is mounted fixed in the machine frame, or to a forme cylinder,

characterized by the combination of the following features:

c) the first and the second adjusting elements in the form of spindles (25, 26, 64, 66) are arranged in roller locks (20, 63) which are mounted on both sides of the inking unit roller (5a, 5b, 6) or dampening unit roller (12) and which serve to receive the end-side bearing journals (21, 57) of the inking unit roller (5a, 5b, 6) or dampening unit roller (12);

d) each spindle (25, 26, 64, 66) can be actuated by way of an electrically triggered drive (17, 18);

e) the electrical triggering of the drive (17, 18) is effected from a memory-programmable control; and

f) a potentiometer (19, 70, 73) which emits an electrical signal which is dependent on the position of the drive (17, 18) and which can be supplied to the memory-programmable control is associated with each electrically triggered drive (17, 18).

2. Apparatus according to Claim 1, characterized in that the bearing journal (21, 57) of the inking unit roller (5a, 5b, 6) or dampening unit roller (12) projects through a cutout (22, 67) of a housing (23, 62) of the roller lock (20, 63) and is provided with a threaded hole (24, 77) through which is guided a first spindle (25, 66) which is mounted such that it is rotatable and is prevented from displacement in the housing (23, 62) of the roller lock (20, 63), and in that in the housing (23, 62) of the roller lock (20, 63) a second spindle (26, 64) is mounted such that it is rotatable and is prevented from displacement and is arranged rotated by an angle (a) of 90 _° with respect to the first spindle (25, 66).

3. Apparatus according to Claim 2, characterized in that a respective toothed wheel (27, 44, 69, 65) is rotatably secured to the spindles (25, 26, 66, 64) and each of these toothed wheels meshes with a toothed wheel (28, 74) which can be driven by way of a respective gearing (18) by means of a respective triggerable drive (17, 18), constructed as a d.c. motor (17).

4. Apparatus according to Claim 3, characterized in that a further toothed wheel (29, 75, 72) which transfers the rotary movement of the spindle (25, 26, 66, 64) to the potentiometer (19, 70, 73) is in engagement with the toothed wheel (27, 44, 59, 65) which can be driven by way of the gearing (18) by the d.c. motor (17).

5. Apparatus according to one of Claims 2 to 4, characterized in that the housing (23) of the roller lock (20) is secured to one end of a pivotal lever (30) whereof the other end is articulated to the axle (31) of the fixed friction roller (4, 11) and can be pivoted about the latter.

6. Apparatus according to Claim 5, characterized in that one end of a guide lever (33) is pivotally articulated to the machine frame (34), in that a pin (32) is secured to the other end of the guide lever (33), and in that the pin (32) projects through a cutout (35) into the housing (23) of the roller lock (20) and is provided with a threaded hole (45) through which the second spindle (26) is guided.

7. Apparatus according to one of Claims 2 to 4, characterized in that a second pin (52), through which the second spindle (64) is guided, is securely connected to the machine frame (60).

8. Apparatus according to Claim 7, characterized in that the second spindle (64) is arranged such that it runs in an approximately tangential direction with respect to the friction roller (4, 11), and in that the first spindle (66) is arranged at a right angle to the second spindle (64).

9. Apparatus according to one of the preceding claims, characterized in that instead of the potentiometer (19) a pressure cell is provided by means of whose emitted measurement value for the application pressure of the inking unit roller (5a, 5b, 6) or dampening unit roller (12) against the friction rollers (4, 11) and/or against the forme cylinder (7) the application of these rollers (4a, 5b, 6, 12) can be regulated.

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