EP0995595A1 - Device for presetting the printing and thrown-off positions of the cylinders of a printing unit of a rotary printing machine - Google Patents

Abstract

The printing mechanism has an adjustable upper and fixed lower rubber blanket cylinders (16,18) and adjustable plate cylinders (12,14) on the upper and lower cylinders, whereby the upper and plate cylinders are mounted in bearing housings (40,44) pivotable wrt. the lower cylinder (18). An actuating device (48) acting on the plate cylinder bearing housings via spring elastic arrangements (56) produces an application force on the plate cylinders towards the lower fixed rubber blanket cylinder in the retracted state, and acts on the cylinder bearing housings in the extended state to separate them. The actuator is hydraulic or pneumatic.

Description

The present invention relates to a device for presetting the Printing adjustment and the printing shutdown of cylinders of a printing unit, in particular a printing unit provided with bearer rings, in a rotary printing press, according to the preamble of claim 1.

EP 0 193 012 A2 discloses a printing press with an improved method and a device for moving the printing cylinder between a print stop position, in which carriers connected to the cylinders are separated from them, and one Print position. The pressure cylinders are moved into their pressure stop position by springs urged, in one embodiment of the invention, the springs rotatably mounted Apply a preload force to the support arms for the cylinders. In another Embodiment of the invention, the cylinders are mounted on free-floating leaf springs, which push the cylinders into their pressure stop position. An engine is provided on the one of the pressure cylinders exerts a force directly, so that it differs from its Print stop position moved to its print position. The other impression cylinders will be under the influence of forces between those connected to the impression cylinders Carriers are transferred from their print stop position to their print position emotional.

EP 0 625 423 A1 discloses a printing unit with a tilting and parking device. The printing unit comprises a frame, a first and second carrier, and an upper one and lower plate cylinder. The first carrier is movably mounted in the frame. On End of the upper plate cylinder is mounted so that it is the first carrier emotional. The second carrier is also movably mounted in the frame. Also a End of the lower plate cylinder is mounted so that it is with the second carrier emotional. The inclination device of the printing unit moves the carriers independently from each other across the frame; and the storage device of the printing unit pivots the straps with respect to the frame. The parking device includes one Actuating cylinder and a piston rod, which are provided between the two carriers. The actuating cylinder and the piston rod are pivotally connected to the supports and can be pivoted relative to these carriers, if these by means of Inclination device can be adjusted transversely. The Carriers are tilted independently of each other while these are facing each other stay connected.

In US Patent Application No. 09 / 103,710 there is an offset printing machine for printing discloses a track that a first movably mounted in a frame Has plate cylinder and a first blanket cylinder, optionally with the first plate cylinder is in contact. A second blanket cylinder is with the second plate cylinder in contact and forms a pressure gap with the first Blanket cylinder. The first are in a first operating state of the printing press Plate cylinder and the first blanket cylinder in direct contact with the both sides web to be printed and in a second operating state are the first Plate cylinder and the first blanket cylinder separately to replace the Allow printing plate on the first plate cylinder while the web of the second blanket cylinder is printed.

There are different versions of the setting with respect to rotary presses the cylinder pressure adjustment and also various over time Pressure shutdown devices in printing presses with supports or bearer rings in various series products from printing press manufacturers. The existing procedures for setting the pressure adjustment of pressure cylinders are time consuming, difficult to perform and require expensive facilities. To the Desired contact force of the cylinder, in particular the contact pressure of the carrier to adjust each printing gap in the printing area, it is with the existing ones Constructions required that an operator manually tighten a clamping screw mechanism or similar adjusted to rotate a large eccentric bearing housing. Therefore it is difficult with an adjustment of the clamping screws to the appropriate level of the contact pressure achieve since there is no known method for simply measuring the set force is. The eccentric bearing housings used in this process have a relatively high wear over a long period of time; also become the side parts are affected during the adjustment of the tensioning screws. As a result of the inevitable signs of wear on the components, the Printing equipment a periodic provision that is already at the customer presses, which is an unavoidable downtime for the respective Machine and a high personnel expenditure means.

In the known methods, separate mechanisms are required, namely for Adjustment of the pressure adjustment of the cylinders on the one hand and for the pressure shutdown the same to the other. This leads to higher costs and adds to the complexity of the Establishment at. There is no facility for separating the blanket cylinders, while the printing plates remain in contact with the respective blanket cylinder. Such a device would allow printing plates to be replaced while the web remains in its position.

During normal machine operation, it is sometimes necessary for everyone to Plate cylinder with respect to the associated blanket cylinder by moving one End of the cylinder in question. With the existing constructions this relative angular movement has a significant (undesirable) change in Pressure adjustment on the movable end of the respective cylinder result.

So far, various attempts have been made to address the shortcomings described above to eliminate. To increase the sensitivity of the setting of the pressure setting decrease, z. B. bearing housing with very small eccentrics used by Fine thread clamping screws are connected. This resulted in a mechanical one Advantage, but was self-locking for the mechanisms. If in the case of a The broken web wraps around the pressure cylinder, the move Adjustments due to self-locking do not, which usually leads to a Damage to the printing cylinders.

To continue the wear at the junction between the frame of the Printing machine and the bearing housings to minimize the diameter of the Lube oil holes enlarged and complex lubrication systems introduced. This was however only partially effective and caused significantly higher costs for the respective Facilities.

In view of the prior art described above and on this Problems encountered in the art are an object of the present invention Presetting of the cylinder pressure adjustment already when assembling the Printing machine to perform a re-adjustment of the cylinder pressure adjustment after starting up the printing machine.

Furthermore, it is an object of the present invention to provide a device with the cylinder pressure adjustment compared to known devices simple and insensitive way can be adjusted.

Another object of the present invention is the wear of the Avoid bearing housing and an inclined position of the plate cylinder enable without this having an effect on the settings of the Pressure adjustment of the cylinder.

This object is achieved by the features of claim 1.

According to the present invention, a printing unit comprises a frame, one in which Frame mounted upper plate cylinder, an upper blanket cylinder that the upper plate cylinder optionally contacted, a lower blanket cylinder that with the upper blanket cylinder forms a pressure gap through which a web is formed moved, a lower plate cylinder that contacts the lower blanket cylinder, and a device, the movable bearing housings of the movable cylinders is assigned to a positioning force that is exerted on bearer rings, which the are assigned to the respective printing unit cylinders.

The advantages of the present invention are given in that a preset the pressure setting force parameters in a simple manner when mounting the respective Printing machine can be done in the factory. Thus a later adjustment of the Parameters no longer required when the press is in operation at the customer is taken. Because the bearings of the respective cylinders are movable Housing, there are signs of wear on the bearing housing and on the Bore in the side part avoided; and there is no friction Corrosion in the side part of the respective printing unit more. Because the plate cylinder also by compression springs assigned to the respective cylinder bearing housings are biased, the plate cylinder can be relative to the respective Move blanket cylinders, which is important when a web breaks, if there is one one case wraps the torn sheet around the circumference of the blanket cylinder.

According to a further embodiment of the present invention, a moves with the movably mounted actuator connected actuator Common cylinder housing. The actuator is in fixed stops attached, which is preferably recorded in the respective side part of the printing unit are. The actuator can be provided with a variety of stops that each cooperate with a respective lever of the movable bearing housing. By pressure elements, the device for adjusting or adjusting the Adjusting force are assigned, the levers of the bearing housing are preloaded. The Pressure element can be a compression spring or a plurality of one behind the other or in parallel compression springs arranged to each other; it is also a disc spring arrangement conceivable.

The aforementioned actuator can be hydraulic or pneumatic Be pressure cylinder with a pressure fluid, compressed air or a fluid is acted upon. An upper and a lower bracket for the with the pressure element provided actuator can be integrated into the actuator.

To counterbalance the weight of the movable upper blanket cylinder create, this cylinder is loaded with a spring preload Compensating device assigned. The upper blanket cylinder can be adjusted using a separate actuator can be movable, which is a hydraulic or Pneumatic cylinder can contain. This makes it possible to get the top one Separate blanket cylinder from the lower blanket cylinder to the printing plate replace while the web is in position, d. H. between Blanket cylinders remain. By using a separate actuator the upper plate cylinder can be used independently of the aforementioned upper and lower ones Blanket cylinders activated, d. H. from the assigned upper blanket cylinder to be employed again.

The features of the present invention will become apparent in the following description preferred embodiment in connection with the accompanying, below listed drawings explained in more detail.

Fig. 1

eine Draufsicht der erfindungsgemäßen Zylinderdruckanstell-/Zylinderdruckabstellvorrichtung und der Zylinder, die sich in der Druckposition befinden;

Fig. 2

eine Darstellung der Fig. 1, in der sich die Zylinder in der Druckabstellposition befinden;

Fig. 3

eine Darstellung der Fig. 1, in der sich die Gummituchzylinder in einer voneinander getrennten Position befinden;

Fig. 4

eine demonstrative Darstellung der Auswirkungen einer Aufwicklung eines Bahnteils auf den ortsfest gelagerten unteren Gummituchzylinder im Falle eines Bahnrisses.

Show it:

Fig. 1

a plan view of the cylinder pressure adjusting / cylinder pressure adjusting device according to the invention and the cylinders which are in the printing position;

Fig. 2

an illustration of Figure 1, in which the cylinders are in the print-off position.

Fig. 3

an illustration of Figure 1, in which the blanket cylinders are in a separate position.

Fig. 4

a demonstrative representation of the effects of winding a web part on the fixed lower rubber blanket cylinder in the event of a web break.

1 shows a view of the pressure setting area of a printing unit. The printing unit 2 includes an upper pair of cylinders and a lower pair of cylinders. The top pair of cylinders consists essentially of an upper plate cylinder 12 and an upper Blanket cylinders 16, which are each movable about pivot bolts 24, 26. The lower The cylinder pair essentially consists of a lower plate cylinder 14 and one lower blanket cylinder 18, preferably only the plate cylinder 14 um a pivot pin 28, which will be described in more detail below, is movable. The lower blanket cylinder 18 is with respect to a side part 4 of the printing unit 2 (Fig. 1a) arranged stationary. A material web 8 moves in the web running direction 10 by one of the surfaces of the movably arranged upper one Blanket cylinder 16 and the stationary lower blanket cylinder 18 formed gap. The movably arranged upper plate cylinder 12 is in one Bearing housing 40 is mounted, with which a lever 42 is connected. The upper Blanket cylinder 16 is mounted in a bearing housing 44 with which a lever 46 connected is. Of the lower pair of printing cylinders is the lower one Blanket cylinder 18 mounted stationary, whereas the movable lower Plate cylinder 14 is mounted in a plate cylinder bearing housing 40, the one Lever 42 is assigned. Is preferably slightly inclined to the web running plane 6 an actuator 48 is arranged which a rod member 64, an upper Has connecting element 50 and a lower connecting element 52. The Actuator 48 can be a pneumatic cylinder, a hydraulic cylinder Cylinder or an electromagnetic component or even an electric motor or comprise another suitable drive means.

The rod member 64 of the actuator is fixed in an upper one Stop 34 and a lower fixed stop 36 attached, and both Stops 34, 36 are mounted in a respective side part 4 of the printing unit 2. On on the rod member 64 attached upper stop 38 is the lever 42 of the Bearing housing 40 assigned to the upper plate cylinder 12. Above the top Connecting element 50 has a stop 47 attached to the lever 46 of the Bearing housing 44 of the upper blanket cylinder 16 is assigned. One under the lower connecting element 52 attached lower stop 54 is the lever 42 of the Blanket cylinder bearing housing 40 assigned.

As shown in Fig. 1, the blanket cylinder bearing housing 44 is by a separate one or second actuating device 72 can be activated. This actuator 72 can consist of a cylinder which is supplied with pressure fluid via lines 78. The actuating device 72 preferably has a separate stop which be mounted on a rod member extending from a cylinder 72 can. The separate stop 74 is attached to the rod member in a position that this contacts the lever 46 from below. The cylinder 72 is in one Cylinder bearing 76 mounted, which is received on a side part 4 of the printing unit 2. Furthermore, the lever 46 of the blanket cylinder bearing housing 44 is an additional one Associated spring mechanism 66, the z. B. has a compression spring 68 by a disc-shaped element 82 is supported. The compression spring 68 can be on a rod 70 be attached and fastened and support the lever 46 on its underside.

The additional spring mechanism 66 is provided to the additional To compensate for the load on the upper movable blanket cylinder 16. Since the the lower blanket cylinder 18 is fixed in position, the actuating device 48 the two upper printing unit cylinders 12 and 16 and the lower one To move plate cylinder 14 together. Thus, by means of the additional Spring mechanism 66 for the additional weight of the movable upper Blanket cylinder 16 provides compensation when the actuator 48th is activated.

Fig. La is a schematic view of those included in the side panels Plate cylinder and blanket cylinder bearing housings 40, 44. On the journal shaft 32 the respective printing couple cylinders 12, 14 and 16 and preferably also 18 in each case a bearer ring 20 attached. By means of the actuating device 48 and the respective upper and lower biasing elements 60, 62 is the bearer ring contact within one large adjustment range adjustable, as described in more detail below. Fig. La shows how the plate cylinder or the blanket cylinder bearing housing in the Side parts 4 of the printing unit 2 is movably mounted. In the plate cylinder or Blanket cylinder bearing housing 40, 44, an opening 22 is provided in which Bearing of the respective printing unit cylinder is added. To move the to execute the respective plate cylinder or blanket cylinder bearing housing 40, 44, the housings 40, 44 each move around a fixed pivot pin 24 and the pivot pins 26, 28, which are used to incline the plate cylinders 12, 14 preferably in the housing or in the side part 4 on the operator side of the printing press are slidably or movably received.

Fig. 2 shows the respective printing unit cylinders in a print stop position. In this State, the actuating device 48 moves the lower connecting element 52 below, so that the lower stop 54, the bearing housing 40 of the lower Plate cylinder 14 pivoted about the pivot pin 28. The top Link 50 is moved up to stop 47 and the top Move stop 38 upwards. As a result, the bearing housing 40 moves upper plate cylinder and the bearing housing 44 of the upper blanket cylinder the fixed pivot pin 24 and the one for the inclination of the upper one Plate cylinder sliding pivot pin 26. In this state, the additional spring mechanism 66 the weight of the upper movable Blanket cylinder 16. Since all movable cylinders by springs 56, 68 with each a force is applied when the respective one is inclined Plate cylinder 12, 14 by moving the pivot pin 26, 28 z. b. towards the Side wall 4 of the printing press, the pressure setting of the cylinder is not essential changed. Since the plate cylinder bearing housing 40 is preferably slidable or in another way translationally movable pivot pins 26, 28 is one Inclined movement of the respective plate cylinder 12, 14 with respect to the respective Blanket cylinder 16, 18 accessible. In the state shown in Fig. 2 is the second Actuator 72 not in use. The three cylinders 12, 14, 16 are through the actuator 48 is activated and the upper movable blanket cylinder 12 is additionally supported by the additional spring mechanism 66.

In Fig. 3 is an individual print off of the upper movable Blanket cylinder 12 shown from the lower stationary blanket cylinder 18.

In this position, the bearing housing 44 of the upper blanket cylinder 12 is through moves the second separate actuator 72 which acts on the lever 46. The Actuator 48, however, is in its inactive position, so that only the second actuator 72 on the bearing housing 44 of the upper Blanket cylinder 12 acts. From Fig. 3 it can be seen that between the surface of the upper blanket cylinder 16 and the surface of the fixed lower one Blanket cylinder 18 a gap is formed. Because this separates the two Blanket cylinder 16, 18 can be done independently, it is possible one Perform printing plate changes while the web 8 continues with z. B. while ongoing Printing machine is passed between the blanket cylinders 16, 18, for example, via corresponding blowing devices or deflection rollers, not shown etc., which a contact between the running web and the preferred here prevent standing blanket cylinders.

4 is a winding of a part of a torn web of material on the Circumference of the stationary lower blanket cylinder 18 shown. The The wound part of the web is provided with the reference number 84. Through this coiled part 84 of web 8 has the diameter of the lower one Blanket cylinder 18 increased significantly, causing the upper plate cylinder 12th and the upper blanket cylinder 16 is pivoted about its respective pivot bolts 24, 26 and the lower plate cylinder 14 around its corresponding pivot pin 28 is pivoted. The plate cylinders 12, 14 are preferably each by Compression springs 56 biased. Due to the movement of the movable cylinders around the respective pivot pins 24, 26 and 28, the cylinders can easily move to a different position take to avoid damage if the end of a broken web opens up should wind up a cylinder.

In Fig. 4, the actuator 48 is after a web break and winding web in its inactive position; and the relative movement of the top Plate cylinder 12, the upper blanket cylinder 16 and the lower Plate cylinder 14 against the spring action or bias of the Spring mechanisms 56 only take place due to the increase in the diameter of the stationary stored blanket cylinder 18 instead.

As a result of the above-mentioned behavior of the respective movable Printing unit cylinders 12, 14 and 16 due to the preloaded condition of the cylinders a possible winding of a torn web of material 8 is the respective Do not damage cylinders 12, 14 and 16. The arranged above the compression spring 56 Biasing elements 60, 62 enable an easily measurable and reproducible Setting the respective preload. Thus, a precise pressure between the Surfaces of the respective bearer rings 20 already during the manufacture of the printing press Be hired in the factory without having to re-hire or provide at the customer's need and without inclination of the respective upper and lower plate cylinder and their respective arranged rubber blanket cylinder must become. So a preset pitch force can be maintained even if the plate cylinders 12, which are supported by the displaceable pivot pins 26, 28 14 be inclined. The upper and lower biasing members 60, 62 can Nuts, by turning them a quarter of a turn a contact strip a bearer ring of approximately 0.0025 cm (0.001 inch) - which is less than 2% of the total Represents setting range - can be changed. Another advantage of the design according to the present invention is the simple manner of setting the required force for a pressure adjustment of the cylinder. After a predetermined Biasing or adjusting force has been set, the size of the pressure adjusting force can be easily measured by the respective position of the top and bottom Biasing element 60, 62 is measured.

LIST OF REFERENCES

2nd

Printing unit

4th

Side panel

6

Web running level

8th

Material web

10th

Web direction

12th

upper plate cylinder

14

lower plate cylinder

16

upper blanket cylinder

18th

lower blanket cylinder

20th

Bearer ring

22

Opening in the bearing housing 40, 44

24th

Swivel pin of the plate cylinder 12

26

Blanket cylinder pivot pin 16

28

Pivot pin of the lower plate cylinder 14

32

PTO shaft

34

upper fixed stop

36

lower fixed stop

38

upper stop

40

Bearing housing of the plate cylinder 12
Bearing housing of the plate cylinder 14

42

Lever of the bearing housing 40 on the plate cylinder 12
Lever of the bearing housing 40 on the plate cylinder 14

44

Bearing housing of the blanket cylinder 16

46

Bearing housing lever 44

47

upper stop

48

Actuator

50

upper connecting element

52

lower connecting element

54

lower stop

56

Compression spring / elastic means

60

Preloading element

62

Preloading element

64

Rod element of the actuator 48

66

Spring mechanism

68

Compression spring

70

Rod for the compression spring

72

separate actuator / cylinder

74

Actuator 72 stops

76

Cylinder bearings

78

Lines for pressure fluid of cylinder 72

82

disc-shaped element

84

wound part of the web

Claims (13)

Printing unit in a rotary printing press, with a fixedly mounted lower blanket cylinder (18), an upper blanket cylinder (16) which can be adjusted to the lower blanket cylinder (18) to form a printing gap, a lower plate cylinder (14) which can be adjusted to the lower blanket cylinder (18), and one to the upper blanket cylinder (16) adjustable upper plate cylinder (12), the upper plate cylinder (12), the upper blanket cylinder (16) and the lower plate cylinder (14) in pivotable bearing housings (40, 44) with respect to the lower blanket cylinder (18) are movably received,
featured
by means of an actuating device (48) acting on the bearing housings (40, 44) of the upper and lower plate cylinders (12, 14) via spring-elastic means (56), which, when moved together, actuates the cylinders (12, 14) in the direction of the stationary lower rubber blanket cylinder (18) generates urgent contact force, and which acts in the extended state on the bearing housing (40, 44) of the cylinder (12, 14, 16) in such a way that they are separated from one another. Printing unit according to claim 1,
characterized,
that the actuating device (48) is held in fixed stops (34, 36) connected to the frame (4) of the printing unit. Printing unit according to claim 1 or 2,
characterized,
that the actuating device (48) is provided with stops (38, 47, 54) which interact to move the cylinders (12, 14, 16) with levers (42, 46) formed on the bearing housings (40, 44). Printing unit according to one of the preceding claims,
characterized,
that the bias of the resilient means (56) for adjusting the adjusting force is adjustable via biasing elements (60, 62). Printing unit according to one of the preceding claims,
characterized,
that the resilient means (56) are compression springs. Printing unit according to one of claims 1 to 4,
characterized,
that the resilient means (56) are disc springs. Printing unit according to one of the preceding claims,
characterized,
that the actuator (48) comprises a hydraulic or pneumatic cylinder. Printing unit according to one of the preceding claims,
characterized,
that the bearing housing (44) of the upper blanket cylinder (16) is assigned a spring mechanism (66) which can be changed in its pretension and which pushes the upper blanket cylinder (16) away from the lower blanket cylinder (18). Printing unit according to one of the preceding claims,
characterized,
that the bearing housing (40) of the upper and / or the lower plate cylinder (12, 14) for slanting the respective plate cylinder (12, 14) with respect to the associated blanket cylinder (16, 18) relative to the housing (4) of the printing unit (26, 28) are. Printing unit according to claim 9,
characterized,
that the inclination of the upper and / or lower plate cylinder (12, 14) via pivot pins (26, 28), which are slidably received in one of the side walls of the printing unit. Printing unit according to one of the preceding claims,
characterized,
that the upper blanket cylinder (16) is assigned a separate actuating device (72), via which the upper blanket cylinder (16) can be switched off from the lower blanket cylinder (18) when the upper plate cylinder (12) is turned on. Printing unit according to claim 11,
characterized,
that the separate actuating device (72) comprises a separate stop (74) on which the bearing housing (44) of the upper blanket cylinder (16) is supported when the upper blanket cylinder (16) is switched off via a lever (46) formed on the bearing housing (44). Printing unit according to one of the preceding claims,
characterized,
that bearers (20) are assigned to the cylinders (12, 14, 16, 18) of the printing unit, by means of which the cylinders are supported against one another in the retracted position of the actuating device (48).

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