EP2090435A1 - Rotary and axial drive, in particular for an ink roller - Google Patents

Abstract

The device has a cylindrical rotation body (1) rotatably drivable around its longitudinal axis (L) by a thread element (2a) and movable along the longitudinal axis. A longitudinal axis of the thread element aligns with the longitudinal axis of the rotation body. A drive (3a) e.g. motor or output element of transmission, is provided for rotary drive of the thread element, and is arranged at or within the rotation body. A rotary movement of the thread element relative to the body causes an axial movement of the body relative to the thread element. An independent claim is also included for a method for adjusting a changing movement and a rotary movement of a rotation body in a printing machine.

Description

The invention relates to a device and a method, in particular in or for a printing press, such. Example, an offset or rotary printing machine, wherein a rotationally driven rotary body rotationally moved along its longitudinal axis and / or is rotationally driven about its longitudinal axis.

In particular, in printing machines, such. As in offset printing machines, it is desirable to move cylinders or rollers along its longitudinal axis. This can for example be used to set a cross register. Another preferred application is found in so-called Farbreibwalzen, with the help of a transported from a color box to a web-to-be-printed material ink film is reduced in terms of its ink film thickness and rubbed on the other along the longitudinal axis of the roller.

In offset printing, the ink film transported for printing the material web is split in terms of its thickness with a plurality of rollers. From a forme cylinder, which has the printing form, the thin ink film is removed from an inking roller with the places whose shapes are to be printed on the material to be printed in the course. After the color decrease, there are thus places on the ink roller on which a thicker, and places, on which a thinner ink film is located. This uneven ink film thickness can reduce the print quality. In order to improve the print quality, so-called Farbreibwalzen be used, which serve in addition to the Farbfilmaufspaltung for a trituration of the ink film in the longitudinal direction of the ink roller. This eliminates uneven color film thicknesses, increasing print quality. The longitudinal movement of the Farbreibwalzen is also referred to as traversing.

Drives for Farbreibwalzen are known from the prior art. From the EP 1 361 055 A2 a Verreibungsantrieb for a roller in a printing press is known in which a perpendicular to the roll axis rotating movement is converted by means of a rotary joint in a longitudinal or traversing movement of the roller. Due to the circular movement of the traversing drive only a sinusoidal traversing movement of the roller is possible.

From the DE 103 24 601 A1 a drive device for a linear and rotary motion is known. The device comprises a rotary drive and a linear drive, such. B. a linear motor, which triggers a linear movement. The linear movement is achieved by an energy storage element, such. As a spring or a magnetic spring, intercepted and vice versa. This creates an oscillating axial movement.

The DE 101 57 243 shows an apparatus for a rotary printing press, comprising a wart-like rotary body and a threaded member, wherein the rotary body of the threaded member along its longitudinal axis is displaceable.

An object of the invention is to provide a device and a method with which a traversing movement and / or a rotational movement of a rotational body is adjustable flexibly and inexpensively.

The object is solved by the features of the independent claims. Advantageous developments emerge from the dependent claims.

The device according to the invention can generally be used in machines in which a rotational body is to be displaced along its longitudinal axis. This is the case in particular in machines in which a rotational body with respect to its axial position relative to a transportable, z. B. web-shaped material to be moved. For example, the device according to the invention can be used in machines in which a fluid is conveyed via a roller system, wherein at least one roller of the roller system, for example for better fluid distribution in Longitudinal, is moved axially. Such a movement can z. B. be a single axial movement or periodically to achieve a so-called traversing the roller. For example, two rotationally co-operating directly with each other axially displaced, in particular opposite, z. B. 180 ° out of phase, moved or changed. The device according to the invention is characterized in that the roller-shaped rotational body can be driven by the threaded element along its longitudinal axis and / or can be driven rotatably about the longitudinal axis of the rotational body. When in the DE 101 57 243 A1 As shown, the threaded element is used exclusively for the axial displacement of the rotating body. The rotary drive is ensured by a separate drive.

Preferably, the roller-shaped rotary body is a roller, in particular a color or dampening roller of a color and / or dampening unit, or a cylinder, in particular a plate cylinder, a blanket cylinder or a transfer cylinder of a printing unit. Particularly suitable, the device in a printing press, Rotalionsdruclunaschine in particular, such. B. in the field of offset printing. In an exemplary inking unit, ink is transferred from a paint container, such as a paint container. B. an ink fountain, applied to a roller and from there via a roller system comprising a plurality of rollers, transferred to a plate or forme cylinder. During the transfer from one roller to the next, the ink film thickness is reduced in each case, in particular halved by color splitting. Since color is assumed only at ink-receiving points of the plate or plate cylinder, the color is transferred to the ink-receiving points later on a web to be printed, especially cloth or paper web, usually by interposing a blanket or transfer cylinder, arise on the Cylinder system upstream mold or plate cylinder different ink film thicknesses, which can lead to a reduction in print quality, in particular for stenciling or ghosting. To avoid this, at least one of the inking rollers can be designed according to the device according to the invention.

In order to produce ink-receptive and ink-repellent areas on the plate or plate cylinder, a fountain solution layer is applied to the plate or plate cylinder before application of ink by means of a dampening unit, in particular only to ink-repellent surfaces Make dampening solution is transferred from the transfer cylinder of the dampening unit to the plate or plate cylinder. Thus, different damping agent thicknesses can also occur in the cylinder system of the dampening unit, which can lead to a reduction in print quality. Thus, the device according to the invention can also be used for at least one of the cylinders of the dampening unit.

The threaded element may preferably be part of a screw drive, namely an inner part, in the following threaded spindle, or an outer part surrounding the inner part, in the following threaded nut. In particular, in the device, a threaded nut and a cooperating threaded spindle are provided, which in particular form the screw drive. For example, the nut may have an internal thread and the threaded spindle an external thread. Alternatively, one of a threaded spindle and a threaded nut may have a thread groove and the other of a threaded spindle and a threaded nut may have a cam which protrudes into the thread groove. An element of the screw drive, namely one of threaded nut and threaded spindle, may be rotatably connected to the rotary body, wherein preferably this element is referred to as a threaded counter-element and the other element of the screw as a threaded element. Preferably, the threaded member may be rotatable relative to the rotary body.

Preferably, the elements of the screw drive on a motion thread. The execution of the thread as a pointed thread is therefore less preferred, but quite possible. Preferably, the motion thread is formed as a trapezoidal thread and more preferably as a ball screw. The use of a ball screw has, in contrast to another thread, such. As trapezoidal, the advantage that the so-called stick-slip effect, ie the transition from static to sliding friction prevents, and the axial play of the threaded elements to each other, which can lead to undesirable effects especially in a reversal of rotation of the elements of the screw become. In order to prevent the axial play of the elements of the screw drive, the nut can be formed in two parts, wherein the parts are braced against each other in the axial direction. This can be found in particular in the ball screw, but also in the other threads application, the ball screw transmission of forces between the elements of the screw by means of at least one, preferably a plurality of balls, which engage in both a groove of the one and in a groove of the other element of the screw drive. In particular, in the ball screw, the balls are arranged between the grooves of the nut and the spindle as Kraflübertragungsmittel. It is generally preferred that the pitch of the thread or the thread groove of the screw drive is so great that no self-locking in the rotational and / or axial direction can take place.

By generating the longitudinal movement of the rotary body with a thread, it is possible to adjust the adjustment path, the speed and / or the acceleration of the rotary body, and in an oscillating rotary body, the frequency and / or the amplitude flexible. The shape of the oscillation can be adjusted flexibly in contrast to the prior art and is therefore not limited to a sinusoidal form, but can take a variety of other forms. By a corresponding control of the drive for the threaded element, such. B. by means of a control or regulating device, a flexible conversion of said parameters in almost any operating state is possible. A conversion of the device or a temporary reduction in operating speed or a complete shutdown of the system is not necessary in the conversion- Preferably, the adjustment of the axial position of the rotary body during the full operating speed, at reduced operating speed and / or standstill of the rotating body. It is particularly preferred that the rotational speed of the rotational body of the device according to the invention compared to the rotational speeds of the rotational body, with which it interacts directly, is adapted so that no or only a negligible slip occurs between the bodies of rotation. In particular, it is preferable that between all rollers no or negligible slip occurs in the inking or dampening unit,

It is further preferred that the longitudinal axis of the threaded element or the screw drive is aligned with the longitudinal axis about which the rotating body rotates. In principle, the longitudinal axis of the threaded element and the longitudinal axis of the rotational body should be parallel.

Preferably, a drive element, in particular a motor or an output member of a transmission for a rotary drive for the threaded element may be provided. Preferred is a Electric motor, in particular angle or speed controlled, or a hydraulic or pneumatic motor. Furthermore, the drive can take place via an output member of a transmission. The drive member of the transmission may for example be connected to a drive motor or a main drive train of the machine. In particular, the ratio of the input to the output speed can be changed via the transmission, so that z. B. the longitudinal movement of the rotating body on the change of the speed ratio in the transmission is generated. The threaded element may be connected to the rotor of the motor or at least rotationally and axially fixed to the rotor of the motor. Further, the threaded element may be the output member of the transmission or rotationally and axially fixed to the output member of the transmission. The engine or the transmission are preferably rotatably and axially fixed to the machine frame.

Distributively, the threaded counter element is rotatably and axially connected to the rotary body. In particular, the associated threaded element can be rotatable and axially movable relative to the threaded counter-element. For example, the threaded element relative to a machine frame, on which the rotational body radially, in particular with a radial bearing, supported, be rotatably movable and axially fixed. In particular, a rotational movement of the threaded element relative to the rotary body can cause an axial movement of the rotary body relative to the threaded element. This does not necessarily mean that a rotational movement of the threaded element always causes an axial movement of the rotating body. Rather, the rotational movement of the threaded element can cause only longitudinal movement, an exclusive rotational movement and / or a combined longitudinal and rotational movement of the rotational body.

The device according to the invention particularly preferably has a further threaded element. The threaded element described above is described below as the first threaded element and the further threaded element as the second threaded element. In particular, the same applies to the second threaded element as for the first threaded element, unless otherwise disclosed below. The first threaded element and the second threaded element can act on the rotary body from a common end face of the rotary body. The threaded elements may be connected to the rotary body at a common end face of the rotary body or into the rotary body extend. For example, one threaded member may extend through the other threaded member, preferably with the longitudinal axes of the threaded members in alignment. In particular, one of the threaded elements can be hollow or tubular, so that the other threaded element can extend therethrough. This has the advantage that the drive or the drives for the threaded elements can be arranged on the same side of the rotating body. An engine can, for. B. drive via a transfer case both threaded elements. Preferably, the transmission is a differential gear, which can increase a rotational speed of a threaded member by an amount and can reduce the rotational speed of the other gear member by the same amount. Preferably, the rotational speeds of the first and the second threaded element provide an arithmetic mean, which preferably corresponds to the rotational speed of the rotary body.

Preferably, each end face of the rotary body has a threaded element with a corresponding drive on the rotary body. In another preferred embodiment of the invention, the drives, in particular with the corresponding threaded elements, can be arranged on the same side of the rotary body or the machine frame, i. that they act on the rotation body from the same side.

Preferably, the threaded elements are rotationally driven in such a way that with respect to a rotational speed of the rotational body, the arithmetic mean of the rotational speeds of the individual drives corresponds to the rotational speed of the rotational body. Preferably, the drives for the threaded elements can be driven or operated so that the one threaded element has the same speed as the other threaded element, whereby the rotational speed of each threaded element corresponds to the rotational speed of the roller body. In this case, no axial movement of the rotating body takes place. For example, a threaded element with respect to the rotational speed of the rotary body increased by a certain amount speed and the other threaded member having a reduced by this amount speed, thereby resulting in an axial displacement of the rotating body in one direction at a constant speed of Rofiationslcörpers. An axial movement of the rotating body in the opposite direction is achieved when the rotational speeds of the threaded elements are reversed. The threaded elements particularly preferably have threads or thread grooves with a different direction of rotation the first threaded element has a right-hand thread or a right-handed thread groove, and the second threaded element has a left-hand thread or a right-handed thread groove, or the first threaded element has a left-hand thread or a right-handed thread groove and the second threaded element has a right-hand thread or a right-handed thread groove. Preferably, the first and second threaded members have the same amount of pitch, ie, eg, the axial travel per revolution. For the axial velocity, which executes the rotary body, there is the relationship that the difference of the rotational speed of the rotary body to the rotational speed of a threaded element multiplied by the pitch of the threaded element results in the amount of the axial velocity of the rotary body. According to this ratio, both the axial acceleration and the axial travel of the Rotationslcörpers can be determined.

The one or more drives for the or the threaded elements or the rotatably connected to the rotary body drive can be mounted outside of the rotating body, which has the advantage that the heat generation of the drives, the rotational body not or only slightly affected. For example, the drives can each be arranged between the machine frame and the rotary body. Alternatively, the drives can be arranged so that the machine frame is located between the rotary body and a drive. For example, the machine frame and the rotary body may be located between the drives.

In a further advantageous embodiment, the drive or drives can be arranged on or within the rotation body. This has the advantage of a more compact design of the device. The one or more drives can be located between the elements of the machine frame, in which the rotational body is supported radially on each of its end faces. The drive elements can, for example by means of sliding contacts or, if the drive elements are rotatably connected to the machine frame, z. B. are connected via simple cable connections, since in preferred embodiments, at least the stators of the drives can not perform rotational movement relative to the machine frame.

In a preferred operating state, the rotational speeds of the threaded elements oscillate in opposite directions, ie. H. phase-shifted by 180 °, the drive or drives being controlled accordingly.

The invention further relates to a method, in particular for use in a printing press, in which a roller-shaped rotary body is driven to rotate about its longitudinal axis and / or is displaced along its longitudinal axis. The method is preferably carried out with the device described herein.

Figur 1

eine Schnittdarstellung einer erfindungsgemäßen Vorrichtung, bei der Motoren außerhalb des Maschinengestells angeordnet sind, und

Figur 2

eine Schnittdarstellung einer erfindungsgemäßen Vorrichtung, bei der die Antriebe innerhalb eines walzenförmigen Rotationskörpers angeordnet sind.

The invention has been described with reference to several advantageous embodiments. In the following, particularly advantageous embodiments will be described with reference to figures. In this case, apparent features alone and in combination advantageously further the subject matter and the advantageous embodiments of the invention. Show it:

FIG. 1

a sectional view of a device according to the invention, in which motors are arranged outside the machine frame, and

FIG. 2

a sectional view of a device according to the invention, in which the drives are arranged within a cylindrical rotating body.

FIG. 1 shows a trained as a roller body of revolution 1, from whose front sides shafts 5 extend, which are supported radially on the machine frame 4a, 4b. The rotation body 1 is due to its length in FIG. 1 not fully represented and therefore shown shortened by a breaking edge. The rotary body 1 is axially movable relative to the machine frame 4a, 4b and rotatably mounted. For this purpose, the shafts 5 bearing surfaces 12a, 12b, which cooperate with a designed as a rolling bearing radial bearings. The bearing surfaces 12a, 12b have a length extending in the longitudinal direction L, which is dimensioned such that the bearing surfaces 12a, 12b respectively interact with the associated radial bearing 6a, 6b when the rotational body 1 is intended to be axially displaced along the longitudinal axis L. The radial bearings 6a, 6b are each received in a bushing 7a, 7b, which in turn is supported on the machine frame 4a, 4b. The radial bearings 6a, 6b are in a cylindrical bore, which of the Bushings 7a, 7b is formed, received and secured with a spacer ring 10a, 10b and an axial securing ring 11a, 11b against falling out.

The shafts 5 have at their ends by means of bushes formed axial stops 9a, 9b, which are formed by a radially projecting collar of a sleeve on. The distance x between the axial stop 9a, 9b and the corresponding stop of the bush 7a, 7b forms the maximum amplitude that the rotating body 1 can perform as intended.

On the side of the machine frame 4a, 4b, which is opposite to the side facing the rotary body 1, a drive 3a, 3b designed as an electric motor is arranged, which is connected to the machine frame 4a, 4b in a rotationally and axially fixed manner. The shafts 5 have tapped holes (in FIG. 1 not visible), in each of which a threaded element 2a, 2b extends. The threaded elements 2a, 2b each have a movement thread. The threaded element 2a is, as shown here by way of example, a left-hand thread and the threaded element 2b a right-hand thread. Thus, the first threaded member 2a and the second threaded member 2b have an opposite rotational sense. The threaded elements 2a, 2b extend through the drive 3a, 3b. The threaded elements 2a, 2b form the rotor of the drive or are rotatably and axially fixedly connected to the rotor of the drive.

Alternatively, the threaded spindles can serve as threaded counter-elements by being rotationally and axially fixedly connected to the rotary body or its shafts. The threaded element is formed in this alternative by the rotor of the drive 3a, 3b.

The function of the device according to the invention FIG. 1 will come out later together with the function of the device FIG. 2 described because the functions are substantially similar.

FIG. 2 shows a further embodiment of a device according to the invention. The rotary body 1 is supported radially on the bushes 7a, 7b, which are rotatably and axially fixed to the machine frame 4a, 4b. The rotary body 1 is rotatable relative to the bushes 7a, 7b and axially displaceable. On the rotation body 1 are Radial bearing 6a, which are axially secured with Axialsicherungsringen 11a, 11b relative to the rotational body. The radial bearings 6a, 6b are supported on bearing surfaces 12a, 12b which are dimensioned in their axial length so that the radial bearings 6a, 6b are still supported on the bearing surfaces 12a, 12b when the rotational body 1 is intended axially offset along its longitudinal axis has been.

Rotationally and axially fixed to the bushings 7a, 7b are each formed as motors drives 3a, 3b connected. The stator of the drives is rotationally and axially fixed to the bushes 7a, 7b and with the machine frame 4a, 4b.

Rotationally and axially fixed to the rotary body 1 are designed as threaded bush threaded counter-elements 8a, 8b, in which threaded elements 2a, 2b are screwed. The threaded elements 2a, 2b extend through the drive 3a, 3b and form the rotor or are rotatably and axially fixedly connected to the rotor. The first threaded element 2a has a left-hand thread and the second threaded element 2b has a right-hand thread, as a result of which the threaded elements 2a, 2b have threads with different directions of rotation.

Alternatively, the threaded spindles can serve as threaded counter-elements by being axially and rotationally fixedly connected to the rotary body 1 via the bushes 8a, 8b. The rotors of the drives 3a, 3b, which are rotatable and axially fixed relative to the machine frame, then serve as threaded elements.

Due to the different direction of rotation of the threads of the threaded elements 2a, 2b, when the drives 3a, 3b are operated in the same direction of rotation, the rotary body 1 is rotated. At the same rotational speeds of the drives 3a, .3b, the rotary body 1 retains its axial position and is not moved axially. If the drives 3a, 3b are operated at different speeds, an axial movement of the rotary body 1 takes place. If the rotational speeds of the drives 3a, 3b are reversed, ie that the drive 3a, 3b, which initially ran slower, is now operated faster and vice versa, then the direction of the axial movement of the rotary body 1 also changes.

For example, a drive, such as. B. drive 3a, operated at a constant speed and the rotational speed of the drive 3b varies, in particular be increased and decreased periodically. In this case, the rotary body 1 performs a periodic traversing movement in the longitudinal direction. In this mode, however, the rotational speed of the rotary body 1 also changes periodically since it is equal to the arithmetic mean of the rotational speeds of the threaded members 2a and 2b.

In order to maintain a constant rotational speed of the rotary body, it is proposed to operate the first threaded element 2a with an rpm increased by a first amount and the second threaded element 2b with an rpm reduced by this amount for an axial movement of the rotary body 1. This leaves the arithmetic mean, i. H. the rotational speed of the rotating body 1 equal, wherein an axial movement of the rotating body 1 takes place. By about the rotational speed of the rotating body 1 oscillating rotational speeds of the threaded elements 2a, 2b, wherein the rotational speed of the first threaded member is 180 ° out of phase with the rotational speed of the second threaded element, at the same rotational speed of the rotating body 1, a periodic traversing of the rotating body 1 can be generated.

reference numeral

1

body of revolution

2a, 2b

threaded element

3a, 3b

drive

4a, 4b

machine frame

5

wave

6a, 6b

radial bearings

7a, 7b

Rifle

8a, 8b

Threaded counter-element

9a, 9b

axial stop

10a, 10b

distancing

11a, 11b

axial safety

12a, 12b

storage area

x

Max. amplitude

L

longitudinal axis

Claims (21)

Device, in particular in or for a printing machine, comprising a roller-shaped rotary body (1) and at least one threaded element (2a), wherein the rotary body (1) of the at least one threaded element (2a) about its longitudinal axis (L) rotatably driven and in particular along its Longitudinal axis (L) is displaceable. Device according to the preceding claim, wherein the roller-shaped rotary body (1) is a roller, in particular a fountain or fountain roller of a dyeing and / or dampening unit, or a cylinder, in particular a plate cylinder, a blanket cylinder or a transfer cylinder of a printing unit. Device according to one of the preceding claims, wherein the rotary body (1) with respect to its rotational movement at a standstill and / or during a rotational movement, in particular with an operating speed, with the threaded element (2a) along the longitudinal axis (L) of the rotary body (1) displaceable is. Device according to one of the preceding claims, wherein the longitudinal axis (L) of the threaded element (2a) is aligned with the longitudinal axis (L) of the rotary body (1), Device according to one of the preceding claims, wherein a drive element (3a), in particular a motor or an output member of a transmission, for a rotary drive for the threaded element (2a) is provided. Device according to one of the preceding claims, wherein a rotational movement of the threaded element (2a) relative to the rotary body (1) causes an axial movement of the rotary body (1) relative to the threaded element (2a). Device according to one of the preceding claims, wherein a rotational movement of the threaded element (2a) causes a rotational movement of the rotary body (1) and / or a displacement along the longitudinal axis (L) of the rotary body (1). Device according to one of the preceding claims, wherein the Gewindeelemen a first threaded member (2a), and a second threaded member (2b) is provided, which is so coupled to the rotary body (1) that the rotary body (1) along its longitudinal axis (L ) is movable. Device according to one of the preceding claims, wherein the threaded elements (2a, 2b) have threads or thread grooves with a different direction of rotation. Device according to the preceding claim, wherein the second threaded element (2b) according to at least one of the features of the threaded element (2a) of claims 3 to 7 is configured. Device according to one of the preceding claims, wherein the drive element (3a) is a first drive element (3a), and a second drive element (3b), in particular a motor or an output member of a transmission, for a rotary drive for the second threaded member (2b) is provided , Device according to one of the preceding claims, wherein a control or regulation is provided with which increases the speed of the first drive element (3a) in relation to the operating speed of the rotary body (1) by an amount and the rotational speed of the second drive element (3b) in relation to the operating speed of the rotary body (1) can be reduced by this amount to achieve an axial displacement of the rotary body (1) at a constant operating speed of the rotary body (1). Device according to one of the preceding claims, wherein the rotary body (1) is so coupled to the first and second threaded element (2a, 2b) that the rotary body (1) rotating at the same speed in the same direction of rotation Threaded elements (2a, 2b) at the same speed and in the same direction of rotation as the threaded elements (1) rotates. Device according to one of the preceding claims, wherein the thread or the threaded elements (2a, 2b) each have a thread or element of a groove-cam gear, wherein the pitch of the thread or the groove is so large that no axial self-locking between your threaded element ( 2a, 2b) and the corresponding threaded counter element (8a, 8b). Device according to one of the preceding claims, wherein at least one drive element (3a, 3b), preferably the first and the second drive element (3a, 3b), on or in the rotary body (1) is arranged. Device according to one of the preceding claims, wherein at least one drive element (3a, 3b), preferably the first and the second drive element (3a, 3b), on a machine frame (4a, 4b) is arranged relative to the rotational body (1) movable is. Device according to one of the preceding claims, wherein the drive elements (3a, 3b) on the same side of the rotary body (1) or the machine frame (4a, 4b) are arranged. Device according to one of the preceding claims, wherein the threaded elements (2a, 2b) act on the rotary body (1) from the same side. Device according to one of the preceding claims, wherein a control or a regulation is provided with which at least one of the first and second drive element (3a, 3b) is driven so that the rotary body (1) according to a predetermined sequence of movement, in particular a traversing movement along the longitudinal axis (L) of the rotary body (1) performs. Method, in particular for use in a printing press, in which a roller-shaped rotary body (1) is rotationally driven about at least one threaded element (2a, 2b) about its longitudinal axis (L) and in particular is displaced along the longitudinal axis (L). Method according to the preceding claim, wherein the method is carried out with a device according to one of claims 1 to 17.

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