DE102008030200A1 - Rotational drive for e.g. impression cylinder, of production machine, has permanent magnets arranged on rotor section of web-guiding cylinder in covering manner, where rotor section is formed integrally with web contact section - Google Patents

Abstract

The drive has a torque motor provided with a circular stator (3) and a cylindrical inner rotor that carries permanent magnets (5) on a lateral surface that is opposite to the stator. The permanent magnets are arranged on a rotor section (7) of a web-guiding cylinder (1) e.g. impression cylinder, in a covering manner, where the rotor section is formed integrally with a web contact section. The rotor section possesses a smaller diameter than the web contact section. A bearing for the cylinder is arranged in a carriage plate, where the cylinder is made of ferrous-magnetic steel.

Description

The The invention relates to a rotary drive for a cylinder according to the preamble of claim 1.

The Field of application of the invention generally extends directly to driven, rotary axes, by means of torque motors, d. H. driven by permanent magnetically excited synchronous motors become. Such driven axles are typically used in production machines used as driven cylinders, z. Color, rubber, plate or impression cylinders in printing presses. In the following will The invention therefore preferably in terms of web-leading Cylinder described, however, the invention covers all other driven cylinders, such as cutting or folding rollers, Material handlers and similar and driven, rotative axes.

In the DE 195 27 199 C2 and the DE 198 20 271 C2 are drive systems web-leading cylinder of machines, in particular printing presses with partly single-driven cylinders or separate coupling of the functional parts have been described to a driving motor, which have an increased control stiffness because of the single drive.

Out In practice, web-guiding cylinders are known which by means of Servomotors with rotary encoder and with or without gearbox driven become. In most cases, there is still a compensation clutch or a belt translation neces sary to ripple error compensate, allow the linear adjustment and to Störkantenkollision to avoid with big servomotors.

railway Leading Cylinders must actually be in operation of the machine or almost touching, possibly leaving a gap, through which a material web is guided. Especially at Cylinders with a small diameter are thus the Statoraußendurchmesser constructive limits set, d. H. the stator outer diameter can not be larger than the diameter of the web-leading Be cylinder. But this is also the torque, which from the driving torque motor can be applied, limited. Although the torque-determining air gap could to enlarge a longer engine, however, a torque and air gap magnification is over the diameter more effective.

From the EP 1 485 980 B1 For example, a torque motor with a rotor and a stator is known which comprises a stator frame with iron cores and electrical windings arranged thereon. The iron cores and the electrical windings are arranged in at least one stator segment, which is constructed independently operable, occupies a predetermined angle section in the stator frame and is releasably connected to the stator frame, that it can be installed and removed without damaging its electrical winding.

From the patent publications DE 41 43 597 C2 and EP 0 722 831 B1 is known a printing press, the printing cylinder are driven directly by means of an electric motor and are guided longitudinally adjustable with respect to its axis of rotation in the wall of the machine. The problem with this arrangement, it is as with other solutions with torque motors with internal rotor, that the connection of the rotor to the web-guiding printing cylinder a torsionally elastic shaft extension is required, the flexibility adversely affects the control stiffness and thus the control performance of the entire arrangement. This can not be corrected by the use of compensating couplings and belt ratios, which are flexible and mechanically not stiff. Furthermore, this shaft journal extension by means of additional clamping elements must be as rigid as possible, permanently connected to the rotary cylinder, which causes costs and can lead to errors during installation.

In view of the aforementioned problem is a drive arrangement in the EP 0 916 486 B2 has been published, in which the angular position sensor is mounted instead of on the engine on the front side of the cylinder for directly receiving the angular movements of the web-guiding cylinder.

Of the Invention is now the object of an arrangement for Direct drive rail-guiding cylinder with increased To create rigidity, which is also the linear shift allows the cylinder and the Störkantenkollision the drive motors in small-diameter cushioned cylinders avoids.

to Solution of this problem is defined in claim 1 Rotary drive proposed.

One Rotary drive according to the invention for a web-guiding cylinder with a web contact section, includes a torque motor with an annular stator and a cylindrical inner rotor, which on his the Stator opposite lateral surface at least partially carries a plurality of permanent magnets, wherein the Permanent magnets of the internal rotor of the torque motor a rotor portion of the web-guiding cylinder shell-shaped are attached, which is formed integrally with the web contact portion is.

Due to the invention is an arrangement achieved with high rigidity, excluding elasticity, flexibility and games.

at a preferred embodiment of the invention is that Bearing of the web-guiding cylinder in a transverse axis of rotation slidable slide plates installed, in which also the respective Stator is flanged. This provides the opportunity for linear displacement of the cylinder despite the direct drive.

Of the track-leading cylinder with its rotor portion is preferably mounted axially displaceable relative to the stator. To compensate the axial displacement movements of the cylinder is the permanent magnets supporting rotor section of the cylinder in the axial direction longer executed as the stator or vice versa, preferably by the amount of the axial displacement length between the rotor section and stator. This results in a total of highly dynamic and rigid rule structure.

at Production machines with at least two adjacent, driven according to the invention web-leading Cylinders, between which in the operating state, the web-shaped Medium is transported through, the stator can not be more complete Ring, but executed as one or more circle segments be the interference edge collision at small cylinder diameters to avoid. This is a space and cost-saving arrangement reached at the maximum possible drive torque.

Further, advantageous embodiments are in the appended subclaims called.

Further Details, features and advantages of the invention will become apparent the following description of preferred embodiments with reference to the drawing. Show it:

1 a side view of an arrangement with three track-leading cylinders with rotary drives;

2 a sectional view of the drive side of such a web-guiding cylinder;

3 a side view of the arrangement of permanent magnets on a rotor portion of the web-guiding cylinder and a detail magnification;

4 a side view illustrating the attachment of the permanent magnets on the rotor portion of the web-guiding cylinder during assembly;

5 a side view of the arrangement of the permanent magnets on the rotor portion of the web-guiding cylinder and a plan view of a forming film which is mounted on the rotor portion;

6 a rolling bearing with integrated angle encoder in two side views;

7 Sectional views of two design variants with respect to the attachment of the stator.

In 1 is an example of a flexographic printing press the location of three web-leading cylinder 01 (Impression cylinder, plate cylinder and Aniloxzylinder) shown to each other, as they are arranged in the operation of the printing press. For simplicity, the cylinders are drawn with the same diameter, the diameters may also be different. Every cylinder 01 has its own rotary drive, which is designed as a torque motor and an external stator 03 includes. The associated stators 03 According to the invention, in this embodiment, they are not designed as complete rings but as segments in order to avoid a collision (interference edge collision) between the stators and at the same time to maximize the torque developed by the segment-shaped torque motors. The cylinders can each have one, two or more stator segments 03 be assigned.

Numerous permanent magnets 05 are each on a rotor section 07 applied shell-shaped, which is an integral part of the web-guiding cylinder 01 forms. Details will be described below, particularly in the explanation of 3 to 5 ,

2 shows a sectional view of the drive side of the web-guiding cylinder 01 with its rotor section 07 , The permanent magnets 05 are entwe the cohesive or cohesive, z. B. by their own attraction or by gluing, directly and directly on the rotor section 07 applied, which is made of a ferromagnetic steel. The cylinder 01 further comprises a web contact section 08 which is integral with the rotor section 07 is trained. This arrangement thus does not know a separate rotor of the torque motor in the true sense, since the rotor section 07 integral part of the cylinder.

The track-leading cylinder 01 is by means of a in a slide plate 09 built-in warehouse 11 stored. The bearing may, for example, be a one, two or more row cylindrical roller bearing. However, other types of bearings, such as needle or tapered roller bearings may be used. The inner ring of the bearing 11 is designed in this example jacket-shaped and directly on a storage section 12 of the cylinder 01 pressed. The storage section 12 forms the transition between the web contact portion in the illustrated embodiment 08 and the rotor section 07 and again is an integral part of the cylinder 01 , The rolling elements are in grooves in the outer ring of the bearing 11 outside out. Since the inner ring is longer than the rolling elements, this arrangement leaves an axial displacement movement of the cylinder 01 too, also called register adjustment, which is particularly necessary for plate cylinders of printing presses for setting the register.

Furthermore, the in 2 shown arrangement two linear guides 13 that is a displacement of the cylinder 01 transverse to its longitudinal axis (pressure-on / pressure-off direction) allow. This allows the plate change and the adjustment or maintenance of the force exerted on the web printing force. The linear guides 13 are supported on the machine wall or on a machine frame 15 from.

On the sled plate 09 are the stator or the stator segments 03 flanged. Above the stators or the stator segments 03 can be a cooling jacket 17 be installed, run in the cooling channels and by the effi cient cooling (eg., Water cooling) of the stator 03 is possible.

The angle measuring system required for the commutation and regulation of the direct drive is executed in the example shown as an incremental, magnetic measuring system, wherein a plurality of measuring grooves 19 in the axial direction in the respective cylinder 01 are introduced directly, similar to a toothing or a gear with spline. The measuring grooves 19 form a Zählkranz, for example, at that of Bahnkontaktabschnitt 08 remote free end of the rotor section 07 located and by means of a measuring head 21 magnetoresistively scanned. However, other scanning methods, such as optical or inductive are conceivable.

Similar to the camp 11 and for the purpose of enabling axial registration or cylinder displacement, the permanent magnet is also the one 05 supporting rotor section 07 The cylinder designed to be longer in the axial direction than the stator 03 , Alternatively, instead, the stator / stator segments could 03 be executed longer than the rotor section 07 , This prevents that in a register adjustment, the common air gap area of the stator and rotor reduced and thus the producible engine torque is reduced.

Furthermore, the range of the counting ring with the measuring grooves is also 19 made wider to ensure a reliable angle scan over the entire register adjustment range, which can be up to +/- 10 mm or more from the center position.

The described arrangement achieves a space, parts and thus cost-saving structural design, with high mechanical stiff connection of the torque-forming permanent magnets 05 to the track-leading cylinder 01 and by equally rigid connection of the stator segments 03 to the machine frame 15 ,

As from the in 3 shown cross-sectional view through the rotor section 07 it can be seen, the permanent magnets 05 by means of an assembly aid 23 made of ferromagnetic steel, which is designed as a very thin-walled sleeve, glued or applied by means of a combination of the above-mentioned bonding techniques. The use of the mounting aid 23 represents an alternative to the direct attachment of permanent magnets 05 on the surface of the rotor section 07 dar. On the mounting aid 23 are the permanent magnets 05 in the known pattern as usual for the torque motors arranged so that the radial direction of magnetization is alternating. The wall thickness of the Monatagehilfe 23 is chosen for reasons of cost just so thick that the permanent magnets 05 be held in a sheath-shaped arrangement on this before mounting. Furthermore, the wall thickness of the mounting aid 23 not so thick that the magnetic field lines short-circuit within this to a significant extent, but essentially by the rotor section 07 of the web-guiding cylinder 01 run. For this reason, the mounting aid 23 not to be understood as an independent rotor. The rotor continues to be the rotor section 07 of the web-guiding cylinder 01 which is made of ferromagnetic steel.

To increase the strength of the magnet assembly, the permanent magnets 05 additionally with a bandage 25 , preferably made of epoxy resin impregnated glass fiber fabric, be positively and / or non-positively enclosed. Furthermore, the permanent magnets 05 be encapsulated with a suitable potting compound, such as polyurethane, epoxy or silicone, to protect them from the attack harmful environmental influences, such. As soiling, shocks, coolants and lubricants, detergents and disinfectants, metal chips, etc. ..

Another way of attaching the permanent magnets 05 on the rotor section 07 is in 4 in this case also the method of assembly is shown, because this could be important for the understanding of the mechanical structure. This embodiment is contrary to in 3 illustrated arrangement without a steel sleeve as an assembly aid. Instead, the permanent magnets 05 on a flexible plastic track 27 glued in a suitable manner, which should be made of a dia- or paramagnetic material, preferably a impregnated with epoxy resin glass fiber fabric. The plastic track 27 , which are the permanent magnets 05 carries is via a rail 29 made of plastic. Once the first magnet the rotor section 07 of the web-guiding cylinder 01 touched, the cylinder is rotated in synchronism with the linear sliding movement of the plastic sheet, so that the permanent magnets 05 on the cylindrical surface of the rotor section 07 distribute with even angular arrangement. The permanent magnets 05 exert on the cylinder made of ferromagnetic steel, an attraction, but these can also be glued. The plastic track 27 is designed slightly longer than the magnet series, so that thereby overlap occurs and the ends of the plastic sheet 27 can be glued together, which contributes to an additional increase in strength. The rail 29 is removed after installation and thus does not remain in the arrangement.

5 shows a further modification of the attachment of the permanent magnets 05 on the rotor section 07 in a cross-sectional view. The permanent magnets 05 are directly, individually on the web-guiding cylinder 01 non-positively applied (by their own power of attraction) or positively (eg by adhesive). For this purpose, in the rotor section 07 of the cylinder 01 Milled longitudinal grooves, in which the permanent magnets 05 be inserted. There is also the option of a molding film 31 with punched or lasered pockets for the positioning of the permanent magnets 05 used, which is wound around the cylinder surface and after the application of the magnets remains or is removed again. These forms 31 can be made of plastic or austenitic stainless steel.

Likewise, the bearing surfaces on the surface of the rotor section can be milled to ensure a good magnetic return. Or it can be the permanent magnets 05 Also be circular segment-shaped, wherein the curvature of its inner surface of the curvature of the support surface is adapted to the cylinder.

By the in 3 . 4 and 5 arrangements shown is a high mechanically rigid connection of the torque-forming permanent magnets 05 to the respective web-guiding cylinder 01 achieved. Due to the mechanical rigidity and compactness, extremely high control stiffnesses and thus a register stability of up to +/- 5 angular seconds can be achieved.

6 shows sectional views of a portion of the cylinder 01 for the alternative attachment of the angle division on the rotating inner ring of the bearing 11 by a counting rim (left illustration) or by a hard magnetic ring 33 , which can be magnetized alternately polarized in the radial direction (right illustration). Due to the proximity to the rolling bearing 11 and thus potential risk of contamination by the rolling bearing grease, the angle division should be scanned here magnetoresistive or inductive.

In another design variant, instead of a separate angle division, the surface induction of the permanent magnets 05 be scanned to obtain therefrom by means of a magnetoresistive sensor incremental angle signals.

7 shows two embodiments for mounting the stator 03 at the slide plate 09 in detail. In the left illustration is the attachment of the stator 03 and the cooling jacket 17 shown as they already are in terms of 2 was explained. In the right-hand illustration of the 7 is the stator 03 designed without cooling jacket, so that the laminated core in the outer diameter can be made slightly larger and directly with the carriage plate 09 connected is.

01

ground-leading cylinder

03

stator

05

permanent magnets

07

rotor section

08

Railway contact section

09

carriage plate

11

camp

12

bearing portion

13

linear guide

15

machine frame

17

cooling jacket

19

Messnuten

21

probe

23

mounting aid

25

bandage

27

Plastic sheet

29

rail

31

shaped foil

33

Hard magnetic ring

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19527199 C2 [0003]
• - DE 19820271 C2 [0003]
• - EP 1485980 B1 [0006]
• - DE 4143597 C2 [0007]
• - EP 0722831 B1 [0007]
• EP 0916486 B2 [0008]

Claims (16)

Rotary drive for a web-guiding cylinder ( 01 ) with a web contact section ( 08 ), comprising a torque motor with an annular stator ( 03 ) and a cylindrical inner rotor, which on its the stator ( 03 ) opposite lateral surface at least in sections a plurality of permanent magnets ( 05 ) bears, characterized in that the permanent magnets ( 05 ) of the inner rotor on a rotor section ( 07 ) of the web-guiding cylinder ( 01 ) are provided in a jacket-shaped, which integral with the web contact portion ( 08 ) is trained. Rotary drive according to claim 1, characterized in that the rotor section ( 07 ) has a smaller diameter than the web contact section (FIG. 08 ) owns. Rotary drive according to claim 2, characterized in that the outer diameter of the stator ( 03 ) greater than the outer diameter of the web contact portion ( 08 ) of the web-guiding cylinder ( 01 ). Rotary drive according to one of claims 1 to 3, characterized in that a bearing ( 11 ) for the web-guiding cylinder ( 01 ) in a slide plate ( 09 ) is arranged, which is displaceable along the axis of rotation of the cylinder, Rotary drive according to claim 4, characterized in that the stator ( 03 ) on the carriage plate ( 09 ) is flanged. Rotary drive according to one of claims 1 to 5, characterized in that the web-guiding cylinder ( 01 ) with its rotor section ( 07 ) is axially displaceable relative to the stator. Rotary drive according to claim 6, characterized in that the permanent magnets ( 05 ) supporting rotor section ( 07 ) of the cylinder ( 01 ) is made longer in the axial direction than the stator ( 03 ), preferably by the amount of the axial displacement length between the rotor section and the stator. Rotary drive according to claim 6, characterized in that the stator ( 03 ) is made longer in the axial direction than the permanent magnets ( 05 ) supporting rotor section ( 07 ) of the cylinder ( 01 ), preferably by the amount of the axial displacement length between the rotor section and the stator. Rotary drive according to one of claims 1 to 8, characterized in that the stator ( 03 ) its associated rotor section ( 07 ) only in the region of one or more circle segment sections surrounds. Rotary drive according to one of claims 1 to 9, characterized in that it comprises an angle measuring system, whose measuring signal is fed to a drive control unit becomes. Rotary drive according to claim 10, characterized in that as the encoder element for the angle measuring system one or more measuring grooves ( 19 ) are in the axial direction in the web-guiding cylinder ( 01 ) are introduced, or that as a donor element a count wreath on with the rotor section ( 07 ) co-rotating inner ring of a bearing ( 11 ) is attached. Rotary drive according to claim 10, characterized in that as a donor element for the angle measuring system, the permanent magnets ( 05 ) of the rotor section ( 07 ) are scanned. Rotary drive according to one of claims 1 to 12, characterized in that the cylinder ( 01 ) is made of ferromagnetic steel. Production machine for processing sheet-like Media with at least one powered web-leading Cylinder, characterized in that the at least one driven Track-leading cylinder part of a rotary drive according to one of claims 1 to 13. Production machine according to claim 14, characterized in that that they at least two adjacent, driven web-guiding cylinder includes, which are each part of a rotary drive and between those in the operating state, the web-shaped medium is transported through. Production machine according to claim 15, characterized in that the stator ( 03 ) is opened at least one of the adjacent rotary actuators in a circular segment to provide in this opening portions of the adjacent rotary drive space available.