EP2995455A1 - Cleaning device with cleaning brush for a printing machine - Google Patents

Abstract

Cleaning device (1) for a printing machine, namely for cleaning a surface of a printing press cylinder or a surface of a printing press roll or a surface of a printing forme or transfer mold arranged on a printing press cylinder, comprising a housing (30) with a cleaning brush (10) received in the housing (30) ), over which the surface to be cleaned can be cleaned, wherein the cleaning brush (10) has a base body (13) and a brush body (14) received by the base body (13), wherein the cleaning brush (10) for cleaning a surface to be cleaned with the Brush trim (14) to the surface to be cleaned with a defined force can be adjusted and about its longitudinal axis (15) is rotationally driven, wherein the cleaning brush (10) at both axial ends of the base body (13) via bearings in the housing (30) is mounted , and wherein the cleaning brush (10) at at least one axial position between the bearings is supported in the radial direction via at least one supporting device (12).

Description

Printing units of an offset printing press have a forme cylinder, a transfer cylinder, an inking unit and preferably a dampening unit. On the form cylinder of such a printing unit at least one printing form is positioned, which may be formed as a printing plate, which is why forme cylinders are also referred to as a plate cylinder. On the transfer cylinder of such a printing unit at least one transfer mold is positioned, which may be formed as a blanket, which is why transfer cylinders are also referred to as rubber cylinders. The inking unit of such a printing unit is used for the application of printing ink and the optionally existing dampening unit of such a printing unit the application of dampening solution to the or each positioned on the form cylinder printing form. Starting from the or each printing form positioned on the forme cylinder, the printing ink is transferred via the or each transfer mold positioned on the transfer cylinder to a printing material to be printed, whereby the printing material to be printed is moved through a printing gap positioned between the transfer cylinder and an impression cylinder. The counter-pressure cylinder may be a satellite cylinder or else a transfer cylinder of another printing unit. During printing, a so-called blanket structure may form on the or each transfer form, which may consist of color residues and constituents of the printing material to be printed. Such a blanket structure affects the achievable print quality and can lead to web breaks when printing a web-shaped substrate. Therefore, it is known in the art to clean the or each transfer mold positioned on a transfer cylinder prior to the start of a new print production. Cleaning a transfer mold is also referred to as blanket washing.

When printing high-quality printed products, such as when printing magazines or catalogs, a blanket wash can also be done during production. Here, a cleaning device is employed at full or reduced production speed to a rotating transfer cylinder and it is a detergent on the transfer cylinder, namely applied to the or each arranged on the transfer cylinder transfer form.

From the prior art, a variety of different cleaning devices for printing presses are known, which serve to clean a rotating cylindrical surface of a printing press cylinder or a printing press roll or a surface of a cylinder surface arranged on a printing plate or transfer mold, so which in particular a blanket washing can be performed. Such cleaning devices have a housing, wherein in the housing of such a cleaning device preferably a washing device and a separate drying device is added. The washing device is used to wash the respective surface to be cleaned with the aid of a liquid detergent. The drying device serves to dry the cleaned surface.

From the US 3,309,993 A as well as from the US 4,015,307 A In each case such cleaning devices with a washing device and a drying device are known, which are received by a housing. Furthermore, it is known from this prior art that either the washing device or the drying device is set to the surface to be cleaned in order to solve in a first cleaning step on the washing device contaminants from the surface to be cleaned and transported away, and in a subsequent second Cleaning step to dry the cleaned surface.

The cleaning brushes such cleaning devices have a base body, which may be formed, for example, as a roller tube, as well as over a recorded or worn from the main body brush trim. At the outer ends of such cleaning rollers are rotatably supported by bearings in the housing. Since for cleaning a surface to be cleaned such a cleaning brush is made with their brushing on the surface to be cleaned with a defined contact pressure or a defined contact pressure, especially when using slim cleaning brushes with a small diameter and large axial length of the respective cleaning brush Forming deflection that affects the achievable cleaning result. Furthermore, the cleaning rollers can be excited to vibrate, which also affect the achievable cleaning result.

In order to counteract the problem of deflection and vibration excitation of the cleaning rollers of cleaning devices, in cleaning devices known from the prior art, the procedure is such that correspondingly larger diameters are realized for the cleaning rollers, in order to minimize the danger of deflection and vibration excitation. However, since the available space is limited to printing presses, there is a need for cleaning devices that have a low deflection risk and low vibration excitation risk for the cleaning rollers even when using thin cleaning rollers.

On this basis, the present invention has the object to provide a novel cleaning device for a printing machine, which allows an effective and thorough cleaning of each surface to be cleaned.

This object is achieved by a cleaning device for a printing press according to claim 1.

According to the invention, the cleaning brush is supported on at least one axial position between the bearings via at least one support device in the radial direction. The inventive radial support of the cleaning brush At least one axial position between the bearings, the danger of deflection and the vibration excitation danger of the cleaning brush can be reduced. The achievable cleaning quality can be improved.

According to an advantageous development, the or each housing-side support device is supported on the main body of the rotating cleaning brush, wherein a portion of the support device supporting on the main body of the cleaning brush slides fixedly on the base body or unrolls on the main body in a rotating manner. In the brush trim of the cleaning brush at least one recess for the passage of the or each support means is introduced, at the or each axial position at which the or each support means supports the cleaning brush in the radial direction. This is a particularly advantageous radial support of the cleaning brush possible.

Preferably, the cleaning brush is rotating and iridescent oscillating, wherein the or each introduced into the brush trim recess runs around the elliptical elliptical around the cleaning brush, in such a way that the respective recess in a circumferential development runs sinusoidal. This embodiment has the advantage that despite the or each recess in the brush trim, the surface to be cleaned in the axial direction of the same can be completely cleaned.

Preferably, the or each support means is positioned on the circumference of the cleaning brush such that a resultant supporting force from the supporting force acting on the or each support means lies in a plane defined by a line of contact of the brush attachment with the surface to be cleaned and the longitudinal center axis of the cleaning brush. Then, when the resulting supporting force is in this plane, a particularly advantageous support of the cleaning brush is possible.

Fig. 1:

einen Ausschnitt aus einer erfindungsgemäße Reinigungsvorrichtung für eine Druckmaschine im Bereich einer Reinigungsbürste; und

Fig. 2:

ein Detail der Reinigungsvorrichtung der Fig. 1.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention are, without being limited thereto, explained in more detail with reference to the drawing. Showing:

Fig. 1:

a detail of a cleaning device according to the invention for a printing machine in the region of a cleaning brush; and

Fig. 2:

a detail of the cleaning device of Fig. 1 ,

The invention relates to a cleaning device for a printing press, in particular an offset web press. The cleaning apparatus is for cleaning a rotating cylindrical surface of a printing press cylinder or a printing press drum to be cleaned or cleaning a surface of a printing plate or transfer mold disposed on a cylinder surface. Particularly preferably, the invention for cleaning a positioned on a transfer cylinder transfer mold, which may be formed, for example, as a blanket or blanket sleeve, use.

The cleaning device 1 has a housing 30 in which a washing device designed as a cleaning brush 10 and preferably also a separate drying device, not shown, is accommodated. Although such a separate drying device is preferred, but optional and therefore not mandatory part of the cleaning device. 1

Then, when the cleaning device 1 comprises the washing device 10 designed as a cleaning brush and further comprising a separate drying device, the same are preferably drivable starting from a common drive 20. In this case, the common drive 20 can drive the washing device 10 and the drying device via a belt drive 21.

Then, when the cleaning device 1 comprises the washing device 10 designed as a cleaning brush and further comprises a separate drying device is preferably only one of these devices is employed on the surface to be cleaned, in which case the housing 30, which accommodates these two devices, is pivotable about a pivot axis in order to ensure that the washing device and drying device are alternately set or turned off.

The cleaning brush 10 of the cleaning device 1 has a base body 13, which is also referred to as a roller tube, as well as a brush attachment 14, which is received or carried by the base body 13. To clean a surface to be cleaned, the cleaning brush 10 with the brush attachment 14 to the surface to be cleaned with a defined force adjustable, the cleaning brush 10 is driven during cleaning of the surface to be cleaned about its longitudinal axis 15, and preferably additionally in the axial direction and accordingly in the direction of the longitudinal axis 15 performs a so-called traversing movement.

The rotational driving of the cleaning roller 10 about its longitudinal axis 15 is in Fig. 1 and 2 by the arrow 16 and the traversing movement is in Fig. 2 visualized by the arrow 17.

The cleaning brush 10 is at free ends, to which it does not wear brush stocking 14, mounted on bearings (not shown) in the housing 30 of the cleaning device 1, said bearings allow the rotational movement 16 and in the case of an additional oscillating movement 17 and the traversing movement ,

For the purposes of the present invention, the cleaning brush 10 is supported at least one axial position between the bearings via at least one support device 12 in the radial direction, wherein it is a housing-side support means in the respective support means 12, the extends through a recess 31 in the housing 30 in the direction of the cleaning roller 10 to be supported.

In the exemplary embodiment shown, the respective housing-side support device 12 is supported on the base body 13 of the cleaning brush 10, for which purpose at least one recess 18 for the passage of the respective support device 12 is introduced into the brush cover 14.

A section of the respective support device 12 which is supported on the base body 13 of the cleaning brush 10 can slide on the base body 13 of the cleaning brush 10 fixedly in the sense of a sliding block or sliding block or alternatively roll on the base body 13 of the cleaning roller 10 in a rotating manner. In the latter case, the portion of the case-side support 12 supported on the body 13 of the cleaning brush 10 may be provided by a roller or ball or the like.

As already stated above, the cleaning brush 10 is supported on at least one axial position between the bearings in the radial direction via at least one support device 12.

The respective recess 18 for the passage of the respective support means 12 is introduced at the respective axial position in the brush stocking 14 of the cleaning brush 10, on which the respective support means 12 ensures the support of the cleaning brush 10 in the radial direction.

Then, when the cleaning brush 10 during cleaning of the surface to be cleaned exclusively rotationally in the direction of the arrow 16 is not driven iridescent, runs the or each introduced into the brush stock 14 recess 18 for the passage of the respective support means 12 at the respective axial position of the cleaning brush 10th circular around the cleaning brush 10 um, in such a way that the respective recess 18 is rectilinear in a circumferential development.

Then, however, if, as in the embodiment shown, the cleaning brush in the cleaning of the surface to be cleaned in the direction of the arrow 16 is rotationally driven and beyond in the direction of the arrow 17, the or any introduced into the brush stock 14 recess 18 of the cleaning brush 10 runs elliptical or in the sense of a relation to the radial direction of the cleaning brush 10 obliquely set circle around the cleaning brush 10 in order, in such a way that the respective recess 18 in the circumferential development runs sinusoidal. Such ellipse-like or in the sense of a circle inclined to the radial direction circular circumferential recess 18 in the brush stocking 14 for the passage of the respective support means 12 shows Fig. 2 ,

The support of the cleaning roller 10 in the radial direction takes place at at least one axial position, preferably at a plurality of axial positions, between the bearings which serve to mount the cleaning roller 10 in the housing 30. It is possible that at each axial position at which the cleaning brush 10 is supported in the radial direction, the support takes place in the circumferential direction of the cleaning brush 10 via a respective single supporting device 12. Alternatively, the support at each of the supported axial positions can also take place via a plurality, preferably two, support devices 12, which are offset relative to one another in the circumferential direction of the cleaning brush 10. Im in Fig. 1 shown embodiment, only such a support device 12 is present at the corresponding axial position.

Then, if the support of the cleaning brush 10 takes place at a plurality of axial positions between the bearings, and if only one supporting device 12 for radial support is used at each axial position, then preferably all the supporting devices 12 are related to the Cleaning brush 10 positioned at the same circumferential positions thereof, so that then the cleaning brush 10 is radially supported by all axially spaced support means 12 at the same circumferential position, so that ultimately acting on the support means 12 supporting forces are all in one plane.

Further, it is possible that the cleaning brush 10 is supported at a plurality of axial positions between the bearings, wherein at each axial position in each case several, preferably two, supporting devices 12 take over the radial support, which are then offset from each other at the respective axial position in the circumferential direction and preferably one Include angles between 40 ° and 90 °. At each of the axial positions of the cleaning brush, on which it is then radially supported by preferably two support means 12, the respective support means 12 are positioned at identical circumferential positions, so that therefore the support means 12 radially support the cleaning brush 10 at all axial positions at the same circumferential positions, so ultimately the supporting forces acting on the support means 12 lie in two planes.

Furthermore, it is also possible that at least a first axial position of the cleaning brush 10, the cleaning brush 10 between the bearings via a single support means 12 and at least a second axial position cleaning brush 10, the cleaning brush 10 between the bearings via a plurality of support means 12 is radially supported. In this case, then preferably the forces acting on the support means 12 supporting forces in more than two levels.

The or each support means 12 is preferably positioned on the circumference of the cleaning brush 10 to be supported such that a supporting force resulting from all the individual support forces lies in a plane passing through a contact line of the brush attachment 14 with the surface to be cleaned and the longitudinal center axis 15 of the cleaning brush 10 is clamped.

Then, if only one supporting device 12 is used at each axial position, then these supporting devices 12 are diametrically opposed to the line of contact of the brush attachment 14 with the surface to be cleaned. Then, if two support means 12 are used for radial support at each axial position, then these support means 12 are circumferentially offset from this plane in which the resulting support force is located in the circumferential direction.

A further advantageous embodiment of the invention is achieved by supporting devices 12 at at least two axial positions of the cleaning brush 10, on which the cleaning brush 10 is supported in the radial direction, the respective support means 12 serving to support the cleaning brush 10 at different circumferential positions, so that at the Support devices 12 acting support forces lie in different levels. For such a configuration of the support means 10 makes it possible in a cleaning device 1 with at least one rotating and iridescent in the axial direction cleaning brush 10 that several, preferably two support means 12, which do not have the same axial position, but in a narrow range in the axial extent of Cleaning brush 10 are arranged and are offset in the circumferential direction to each other, to slide in the same recess 18 of the brush stocking 14 on the body 13 or unroll. Thus, a rotating and iridescent cleaning brush 10 can be supported at a plurality of circumferentially offset positions on at least a portion in the axial extent of the cleaning brush 10, wherein the number of required for this elliptical or in the development sinusoidal recesses 18 of the brush stocking 14 the number of axial regions corresponds with appropriate support. In this way, a simple production of the cleaning brush 10 can be ensured by a small number of recesses 18 to be produced of the brush stocking 14, and furthermore a the highest possible proportion of the brush stocking 14 on the cleaning roller 10 for the cleaning or drying effect of this considerable advantage.

When the angle between the support means 12 in the circumferential direction is designated as α, and assuming that the cleaning brush 10 exerts a complete traverse stroke H during a single revolution, ie the cleaning brush 10 during the first half revolution, a total traverse stroke H in a first direction and in the second half of the revolution, executes the same traverse stroke H in a second direction opposite the first direction, the offset s in the axial direction is calculated between two adjacent supporting devices 12 in the same axial region according to the formula $$\mathrm{s}=\left(\mathrm{H}/\mathrm{180}\mathrm{°}\right)\mathrm{x\; \alpha }$$

It is irrelevant whether two or more than two support devices 12 are used in a narrow axial region, which can have the amount of traverse stroke H in the axial extent at most.

The present invention therefore proposes a cleaning device 1 with a cleaning brush 10, which is supported at its axial ends in bearings, and which is additionally supported between their camps at least one axial position via at least one support means 12 in the radial direction, wherein the or each supporting device 12 extends through the brush attachment 14, namely by at least one recess 18 introduced into the brush attachment 14, and wherein the or each support device 12 comes into abutment with a section on the base body 13 of the cleaning brush 10 for the radial support of the cleaning brush 10. Even with the use of slim cleaning brushes 10 with a small diameter and a large axial extension, the risk of deflections and vibrations of the cleaning brush 10 can thereby be considerably reduced, so that finally a good cleaning result can be provided. The or each recess 18 in the brush stocking 14 for the passage of the respective support means 12 has a shape on, which follows the sliding or rolling of the support means 12 on the rotating and optionally iridescent cleaning brush 10.

In the exemplary embodiment shown, the cleaning brush 10 is a washing brush onto which washing agent 11 can be applied via a spraying device.

The cleaning brush 10 may also be a drying brush that serves to dry the surface to be cleaned after washing it.

Then, if a plurality of supporting devices 12 are used for the radial support of the cleaning brush 10, all supporting devices 12 can be made identical, in particular, then all support devices 12 have the same axial extent. Alternatively, it is also possible that used at different axial positions and / or different circumferential positions for the radial support of the cleaning brush 10 supporting devices 12 have a different axial extent.

LIST OF REFERENCE NUMBERS

1

cleaning device

10

cleaning brush

11

spraying

12

support means

13

body

14

brush border

15

longitudinal axis

16

rotary motion

17

Oscillating movement

18

recess

20

drive

21

belt drive

30

casing

31

recess

Claims (11)

Cleaning device (1) for a printing machine, namely for cleaning a surface of a printing press cylinder or a surface of a printing press roll or a surface of a printing forme or transfer mold arranged on a printing press cylinder, comprising a housing (30) with a cleaning brush (10) received in the housing (30) ), over which the surface to be cleaned can be cleaned, wherein the cleaning brush (10) has a base body (13) and a brush body (14) received by the base body (13), wherein the cleaning brush (10) for cleaning a surface to be cleaned with the Brush attachment (14) to the surface to be cleaned with a defined force can be adjusted and about its longitudinal axis (15) is rotationally driven, and wherein the cleaning brush (10) at ends of the base body (13) via bearings in the housing (30) is mounted, characterized in that the cleaning brush (10) at least one axial position z between the bearings is supported in the radial direction via at least one supporting device (12). Cleaning device according to claim 1, characterized in that the or each housing-side support means (12) on the base body (13) of the rotary cleaning brush (10) is supported, wherein on the base body (13) of the cleaning brush (10) supporting portion of the support device (12) slidably on the base body (13) slides or unrolling on the main body (13) rolls. Cleaning device according to claim 1 or 2, characterized in that in the brush attachment (14) at least one recess (18) for the passage of the or each support means (12) is introduced, at the or each axial position at which the or each support means (12) supports the cleaning brush (10) in the radial direction. Cleaning device according to claim 3, characterized in that when the cleaning brush (10) is exclusively driven to rotate, the or each in the brush set (14) introduced recess (18) at the respective axial position of the cleaning brush (10) circulates circularly, namely in such a way that the respective recess (18) extends in a straight line in a circumferential development. Cleaning device according to claim 3, characterized in that when the cleaning brush (10) is rotatable and iridescent, the or each in the brush attachment (14) introduced recess (18) of the cleaning brush (10) rotates such that the respective recess ( 18) extends sinusoidally in a circumferential development. Cleaning device according to one of claims 1 to 5, characterized in that at the or each axial position between the bearings on which the cleaning brush (10) is supported in the radial direction, the support in the circumferential direction of the cleaning brush (10) seen in each case a single support means (12). Cleaning device according to claim 6, characterized in that at each axial position of the cleaning brush (10) on which it is supported in the radial direction, the respective support means serving support (12) supports the cleaning brush (10) at the same circumferential position, so that the Supporting (12) acting support forces are all in one plane. Cleaning device according to claim 6, characterized in that at least two axial positions of the cleaning brush (10) on which it is supported in the radial direction, the respective support means serving support (12) support the cleaning brush (10) at different circumferential positions, so that the the support means (12) acting support forces lie in different planes. Cleaning device according to one of claims 1 to 5, characterized in that at the or each axial position between the bearings on which the cleaning brush (10) is supported in the radial direction, the support in the circumferential direction of the cleaning brush (10) seen in each case more, preferably via two, offset in the circumferential direction support means (12). Cleaning device according to claim 9, characterized in that at each axial position of the cleaning brush (10) on which it is supported in the radial direction, the respective two support means serving the support (12) support the cleaning brush (10) at the same circumferential positions, so that the supporting forces acting on the support means (12) lie in two planes. Cleaning device according to one of claims 1 to 10, characterized in that the or each supporting device (12) is positioned on the periphery of the cleaning brush (10) such that a resultant supporting force from the supporting force acting on the or each support means (12) in a plane is located, which is spanned by a contact line of the brush attachment (14) with the surface to be cleaned and the longitudinal central axis (15) of the cleaning brush (10).

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