Information
-
Patent Grant
-
6360664
-
Patent Number
6,360,664
-
Date Filed
Tuesday, February 1, 200024 years ago
-
Date Issued
Tuesday, March 26, 200222 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
- Cohen, Pontani, Lieberman & Pavane
-
CPC
-
US Classifications
Field of Search
US
- 101 480
- 101 485
- 101 486
- 101 481
- 101 248
- 101 DIG 38
- 101 286
-
International Classifications
-
Abstract
An apparatus constructed which accurately guides and adjusts a cylinder axially in a rotary printing machine. For this purpose, an electromagnetic system, with which an axial force can be applied to the cylinder, is arranged on the frame of the rotary printing machine. The cylinder is mounted in mountings that permit axial displacement.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to printing machines, and more particularly to an apparatus for the axial guidance and adjustment of a plate cylinder in a rotary printing machine.
2. Description of the Related Art
In a color print, the color images to be printed one after another have to be printed in register with one another. For this purpose, in rotary printing machines the plate cylinder can be adjusted with respect to the lateral, circumferential and, if necessary, diagonal register, apart from solutions in which the printing plate is adjusted directly. For the purpose of adjusting the lateral register, the plate cylinder is shifted in the axial direction. In this context, DE 34 09 194 A 1 describes an apparatus in which the axial movement is produced by means of a threaded spindle driven by a motor. The threaded spindle is connected to the journal of the plate cylinder via ball bearings.
This apparatus is complicated in design and is thus expensive with regard to the manufacturing costs. Furthermore, mechanical parts are affected by play and are subject to wear which increases the play. The play impairs the axial fixing of the cylinder and hence the constancy of register. In addition, during the adjustment of the cylinder position, hysteresis deviations which influence the register occur.
SUMMARY OF THE INVENTION
It is therefor an object of the invention to provide an apparatus which is constructed from simple means and which accurately guides and adjusts the cylinder axially.
According to the invention, the apparatus can be set up cost-effectively and such that it renders mechanical gear mechanisms for lateral register adjustment superfluous. It permits the cylinder to be guided without contact and, as a result, without wear and hysteresis, by means of mechanical drives. In an advantageous embodiment of the invention, through direct measurement of the actual position of the cylinder, the associated influence of hysteresis is also dispensed with. As a result, the cylinder is axially positioned and adjusted very accurately overall, which means that a high register accuracy and thus good print quality can be achieved.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is to be explained in more detail below using some exemplary embodiments. In the associated drawings:
FIG. 1
is a cross-sectional view of an apparatus for the axial guidance and adjustment of a cylinder with two magnetic coils;
FIG. 2
is a cross-sectional view of an embodiment in which one magnetic coil is replaced by a spring;
FIG. 3
is a cross-sectional view of a modified embodiment from that shown in
FIG. 2
;
FIG. 4
is a schematic block diagram relating to driving the magnetic system;
FIG. 5
is a sectional view of a cylinder with magnetic coils arranged at both ends; and
FIG. 6
is a sectional view of a journal of a cylinder which, in contrast to the embodiment of
FIG. 1
, bears two discs.
DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS
FIG. 1
shows a cylinder
1
of a rotary printing machine, which is cantilever-mounted in a side wall
2
(frame). The cylinder
1
is a plate cylinder, however, it could also be another cylinder, for example a transfer cylinder. The cylinder is set up in a spindle design, that is to say the body
4
of the cylinder
1
is flange-mounted on the head of a spindle
3
. Other designs and mountings of cylinders are also possible, as will be shown in following exemplary embodiments. The spindle
3
, together with the rotor
5
arranged on it and with the stator
6
of a built-in motor
7
, is accommodated in a housing
8
, which in turn is accommodated in the wall
2
. The spindle
3
is mounted in the housing
8
with radial bearings
9
,
10
with the ability to be displaced axially, for example cylinder roller bearings. Furthermore, a stop system
11
which does not impair the ability of the cylinder
1
to rotate is arranged in the housing
8
and contains a grooved ball bearing
12
which is accommodated in the bore in the housing
8
and which interacts with two sleeves
25
,
26
on the spindle
3
.
Also arranged on the cylinder
1
is an electromagnetic system. In detail, a disc
13
made of a ferromagnetic material is fastened on the spindle
3
, in each case a magnetic coil
14
,
15
accommodated in the bore of the housing
8
being arranged on both sides of the disc, at a distance from the sides. The disc
13
incorporates two mutually oppositely oriented ferromagnetic surfaces. In order to achieve a high operating accuracy of the apparatus, the surfaces of the disc
13
have the lowest possible axial run-out, and the disc
13
is extremely homogeneous, for example does not contain any voids.
The magnetic coils
14
,
15
of the electromagnetic system are driven by a register control system, as shown in FIG.
4
. In detail, a sensor
17
, which scans register marks printed on a web
18
, is connected to the input of a comparison device
19
, to which a signal for the desired value of the register is also fed. On the output side, the comparison device
19
is connected via a control device
20
to a further comparison element
21
. A measured value transmitter
22
for the position of the cylinder
1
is connected to the second input of the comparison element
21
. On the output side, the comparison device
21
is connected via a control device
23
and an amplifier
24
to the magnetic coils
14
,
15
of the electromagnetic system.
The signal supplied by the sensor
17
for the actual value of the register is compared with a desired value in the comparison element
19
. The difference signal obtained in this way, conditioned by the control device
20
, is fed to the comparison element
21
and there is compared with the signal supplied by the measured value transmitter
22
for the actual position of the cylinder
1
. In the event of a deviation from the desired value, a difference signal is forwarded to the control device
23
. There, the signal for driving the magnetic coils
14
,
15
is prepared and fed to the coils after appropriate amplification in the amplifier
24
. In the driven state, that is to say when they are energized, the magnetic coils
14
,
15
exert pulling forces on the disc
13
. The disc
13
is shifted in the direction of the magnetic coil which exerts the greater attractive force on it.
The adjustment operation preferably takes place when the spindle
3
is rotating. As a result, the adjustment does not take place with any sliding displacement in the direction of the circumferential contact lines of the rolling elements, but in a less harmful manner by rolling helically on the rolling elements. When it is established that the desired position of the cylinder
1
has been reached based on the signal output by the measured value transmitter the magnetic coils
14
,
15
are energized such that the position is maintained.
The apparatus uses the position of the cylinder
1
, determined by measurement, for the active control of the energization of the two magnets. As a result, stable, freely selectable, accurate axial positioning of the cylinder
1
can be achieved. The measured value transmitter
22
used is advantageously a non-contacting, inductive, capacitive, optical, interferometric or mechanical sensor. The reference surface needed for the measured value transmitter
22
, which surface can be designed as a disc, for example, is advantageously fitted close to the body
4
of the cylinder, for example on the head of the spindle
3
which bears the body
4
or at the end of the body
4
of the cylinder. As a result, disruptive influences, such as problems with electromagnetic compatibility thermal influences, for example thermal expansion of the spindle
3
, and contamination are minimized.
The distances a
2
between the sleeves
25
,
26
, and the grooved ball bearing
12
(FIG.
1
), as well as the distances a
1
between the magnetic coils
14
,
15
and the disc
13
, are such that, assuming central positions of the grooved ball bearing
12
and of the disc
13
, a
2
is less than a
1
. In the end positions, the sleeves
25
,
26
strike the grooved ball bearing
12
and thus limit the axial displacement travel of the cylinder
1
. In addition, this stop system
11
means that damage is avoided in the event of any disruption to the electromagnetic system
14
,
15
. In the case of any possible disruption of this type, the cylinder
1
can run down to a standstill without any risk and without any further axial guidance. Sleeves
25
,
26
may strike the grooved ball bearing
12
, by which means any mechanical collision between the disc
13
and the magnetic coils
14
,
15
, and any associated damage, is avoided.
The stop system
11
having the grooved ball bearing
12
and the sleeves
25
,
26
can also be employed for very accurate axial positioning of the cylinder
1
, such as is required for example for the direct imaging of a plate cylinder in the printing machine. For this purpose, the magnetic coils
14
,
15
are driven such that the sleeves
25
,
26
of the cylinder
1
are in contact with the grooved ball bearing
12
. The ground bearing
12
performs the function of a supporting bearing and guarantees the highest accuracy with regard to the axial running of the cylinder
1
as it rotates. This axial stop can also be implemented in another way, for example by means of angled ball bearings or tapered roller bearings arranged in pairs.
FIG. 2
shows a further embodiment, in which one magnetic coil is replaced by a spring. For the purpose of simplification, in this exemplary embodiment and in the one following, in the case of repeated and similar components the same item numbers are used, if necessary with the addition of “0.1”, “0.2”. A cylinder
1
.
1
, by way of example not designed with a spindle and flange-mounted body, is cantilever-mounted with its journal
27
in the side wall
2
. The mounting is carried out in a bush
28
accommodated in the side wall
2
, otherwise in the latter by means of radial bearings
9
,
10
, analogously to FIG.
1
. Also provided is the grooved ball bearing
12
, which interacts with the sleeves
25
,
26
. In order to drive the cylinder
1
.
1
, a spur gear
29
is arranged on its journal
27
. The drive could also be carried out by means of a dedicated motor, for example in a manner similar to the design according to FIG.
1
. Fastened on the journal
27
of the cylinder
1
.
1
is a disc
13
of a ferromagnetic material, on one of whose sides, which supplies a ferromagnetic surface, and at a distance from the said side there is arranged a magnetic coil
14
. The magnetic coil
14
is fastened in a housing
30
which is flange-mounted on the side wall
2
. The housing
30
also accommodates a plate
31
, against which a compression spring
32
bears. The spring
32
is supported by a thrust bearing
33
on the journal
27
of the cylinder
1
.
1
.
The compression spring
32
in practice replaces a second magnetic coil. Its spring force is directed counter to the pulling force of the magnetic coil
14
. In order to hold the cylinder
1
.
1
in s specific position, the spring force maintains equilibrium with the force applied to the disc
13
by the magnetic coil
14
. For the purpose of displacing the cylinder
1
.
1
to the left, the pulling force of the magnetic coil
14
is reduced by driving it appropriately, so that the spring force predominates and the compression spring
32
displaces the cylinder
1
.
1
accordingly until the spring force and the force of the magnetic coil
13
maintain equilibrium. Conversely, in order to displace the cylinder
1
.
1
to the right, the energization of the magnetic coil
14
is increased, so that the disc
13
is pulled in the direction of the magnetic coil
14
and the cylinder
1
.
1
is displaced in this direction counter to the force of the compression spring
32
. In order to drive the magnetic coil
14
, a circuit is used which is similar to that shown in FIG.
4
. For the purpose of avoiding repetitive descriptions, more detailed explanations are omitted.
The grooved ball bearing
12
also has the functions (unchanged with respect to
FIG. 1
) of the stop of the stop system
11
, as collision protector and of a supporting bearing for the highly accurate axial running of the cylinder
1
.
1
. Continuing repetitive descriptions are therefore omitted. Reference should merely be made to the fact that in each case a distance a
1
, which is greater than the distance a
2
, has to be implemented between the plate
31
and the disc
13
and between the disc
13
and the magnetic coil
14
(see FIG.
2
).
FIG. 3
shows an embodiment in which, in a manner similar to
FIG. 2
, one magnetic coil is replaced by a spring. By way of example, a cylinder
1
.
2
is mounted with its journals
34
,
35
on both sides in respective side walls
2
,
36
. Used for this are radial bearings
37
,
38
, which permit the cylinder
1
.
2
to be displaced axially. The drive to the cylinder
1
.
2
is carried out by means of a spur gear
29
on the journal
34
.
A disc
39
of a ferromagnetic material is fastened to one end of the body
40
of the cylinder
1
.
2
. A magnetic coil
41
is positioned at a distance from the free side of the disc
39
, and is screwed to the wall
2
. In addition, a compression spring
43
bears on the journal
34
of the cylinder
1
.
2
with the interposition of a thrust bearing
42
and, by its other end, is supported on a cover
44
screwed to the side wall
2
.
In the same way as in the function with the exemplary embodiment according to
FIG. 2
, the force applied by the magnetic coil
41
and the spring force of the compression spring
43
maintain equilibrium, the cylinder
1
.
2
being held in a specific axial position. Depending on whether the cylinder
1
.
2
is to be adjusted axially to the left or right, the pulling force of the magnetic coil
41
is increased or reduced by means of appropriately varying its energization. The magnetic coil
41
is driven by a circuit, in a manner similar to that shown in
FIG. 4
, for which reason an additional description will be omitted in order to avoid repetition. One advantageous fitting of the measured value transmitter
22
used for the position of the cylinder
1
.
2
to the end of the latter is indicated in FIG.
3
. The apparatus according to
FIG. 3
also contains the stop system
11
having the grooved ball bearing
12
and the sleeves
25
.
1
and
26
. Here, too, the function is the same as in the preceding exemplary embodiments, for which reason reference is made to the description relating to the exemplary embodiment according to FIG.
1
. The distance a
1
between the magnetic coil
41
and the disc
39
, which must be greater than the distance a
2
between the grooved ball bearing
12
and the sleeve
26
, is indicated.
According to
FIG. 5
, by contrast with
FIG. 3
, no discs
39
are fitted to the ends of a body
40
of a cylinder
1
.
3
. Instead, the ferromagnetic ends of the body
40
of the cylinder
1
.
3
each interact with a magnetic coil
45
,
46
fitted alongside them in each case. Otherwise, the mounting of the journals
47
,
48
of the cylinder
1
.
3
in the side walls is similar to that shown in FIG.
3
. By means of the magnetic coils
45
,
46
, mutually opposed pulling forces can be exerted on the cylinder
1
.
3
. The cylinder
1
.
3
can be positioned depending on the driving of the magnetic coils
45
,
46
. By virtue of the ability to apply opposed forces, the provision of a spring
43
is superfluous. The further construction of the apparatus corresponds to that already described. Rings (similar to the ring
39
in
FIG. 3
) can also be fitted to both ends of the body
40
, with which rings the magnetic coils
45
,
46
interact.
According to
FIG. 6
, two discs
50
,
51
of a ferromagnetic material are fastened centrally to a journal
49
(or a spindle) of a cylinder not illustrated. In each case a magnetic coil
52
,
53
is positioned on the mutually facing sides of the discs
50
,
51
. Instead of this, the magnetic coils
52
,
53
could also be arranged on those sides of the discs
50
,
51
which face away from each other. Also, if there were two journals
49
present, a disc
50
,
51
together with associated magnetic coil
52
,
53
could be fastened on each. Using the magnetic coils
52
,
53
, mutually oppositely oriented axial forces can be applied to the discs
50
,
51
and therefore to the cylinder (not illustrated) in order to position it. The further construction and the functioning correspond to the exemplary embodiments already described.
In the exemplary embodiments, use is made of surfaces of discs
13
,
39
,
50
,
51
which interact with both sides or only one side with two magnetic coils
14
,
15
,
52
,
53
or only one magnetic coil
14
,
41
. These sides are advantageously flat and level. However, it is also possible for the sides to be curved to a specific extent, for example whilst maintaining rotational symmetry. It is also possible that, instead of fastening the disc
13
,
50
,
51
to the journal
3
,
27
,
49
of the cylinder
1
,
1
.
1
, these are designed as a constituent part of the respective journal
3
,
27
,
49
, for example as an extension. It is also possible to mount the ferromagnetic bodies containing the surface or surfaces such that they are axially undisplaceable, for example on the journal
3
,
27
,
49
. Surfaces of this type, which then do not rotate, do not need to be of continuous design but may have a hole for example. It is also possible, for example, for a journal of the cylinder to be mounted such that it cannot be axially displaced in a bush, which is shifted by means of the magnetic system.
FIG. 1
shows a cylinder
1
of a rotary printing machine, which is cantilever-mounted in a side wall
2
(frame). The cylinder
1
is a plate cylinder, however, it could also be another cylinder, for example a transfer cylinder. The cylinder is set up in a spindle design, that is to say the body
4
of the cylinder
1
is flange-mounted on the head of a spindle
3
. Other designs and mountings of cylinders are also possible, as will be shown in following exemplary embodiments. The spindle
3
, together with the rotor
5
arranged on it and with the stator
6
of a built-in motor
7
, is accommodated in a housing
8
, which in turn is accommodated in the wall
2
. The spindle
3
is mounted in the housing
8
with radial bearings
9
,
10
with the ability to be displaced axially, for example cylinder roller bearings. Furthermore, a stop system
11
which does not impair the ability of the cylinder
1
to rotate is arranged in the housing
8
and contains a grooved ball bearing
12
which is accommodated in the bore in the housing
8
and which interacts with two sleeves
25
,
26
on the spindle
3
.
Also arranged on the cylinder
1
is an electromagnetic system. In detail, a disc
13
made of a ferromagnetic material is fastened on the spindle
3
, in each case a magnetic coil
14
,
15
accommodated in the bore of the housing
8
being arranged on both sides of the disc, at a distance from the sides. The disc
13
incorporates two mutually oppositely oriented ferromagnetic surfaces. In order to achieve a high operating accuracy of the apparatus, the surfaces of the disc
13
have the lowest possible axial run-out, and the disc
13
is extremely homogeneous, for example does not contain any voids.
The magnetic coils
14
,
15
of the electromagnetic system are driven by a register control system, as shown in FIG.
4
. In detail, a sensor
17
, which scans register marks printed on a web
18
, is connected to the input of a comparison device
19
, to which a signal for the desired value of the register is also fed. On the output side, the comparison device
19
is connected via a control device
20
to a further comparison element
21
. A measured value transmitter
22
for the position of the cylinder
1
is connected to the second input of the comparison element
21
. On the output side, the comparison device
21
is connected via a control device
23
and an amplifier
24
to the magnetic coils
14
,
15
of the electromagnetic system.
The signal supplied by the sensor
17
for the actual value of the register is compared with a desired value in the comparison element
19
. The difference signal obtained in this way, conditioned by the control device
20
, is fed to the comparison element
21
and there is compared with the signal supplied by the measured value transmitter
22
for the actual position of the cylinder
1
. In the event of a deviation from the desired value, a difference signal is forwarded to the control device
23
. There, the signal for driving the magnetic coils
14
,
15
is prepared and fed to the coils after appropriate amplification in the amplifier
24
. In the driven state, that is to say when they are energized, the magnetic coils
14
,
15
exert pulling forces on the disc
13
. The disc
13
is shifted in the direction of the magnetic coil which exerts the greater attractive force on it.
The adjustment operation preferably takes place when the spindle
3
is rotating. As a result, the adjustment does not take place with any sliding displacement in the direction of the circumferential contact lines of the rolling elements, but in a less harmful manner by rolling helically on the rolling elements. When it is established that the desired position of the cylinder
1
has been reached based on the signal output by the measured value transmitter the magnetic coils
14
,
15
are energized such that the position is maintained.
The apparatus uses the position of the cylinder
1
, determined by measurement, for the active control of the energization of the two magnets. As a result, stable, freely selectable, accurate axial positioning of the cylinder
1
can be achieved. The measured value transmitter
22
used is advantageously a non-contacting, inductive, capacitive, optical, interferometric or mechanical sensor. The reference surface needed for the measured value transmitter
22
, which surface can be designed as a disc, for example, is advantageously fitted close to the body
4
of the cylinder, for example on the head of the spindle
3
which bears the body
4
or at the end of the body
4
of the cylinder. As a result, disruptive influences, such as problems with electromagnetic compatibility thermal influences, for example thermal expansion of the spindle
3
, and contamination are minimized.
The distances a
2
between the sleeves
25
,
26
, and the grooved ball bearing
12
(FIG.
1
), as well as the distances a
1
between the magnetic coils
14
,
15
and the disc
13
, are such that, assuming central positions of the grooved ball bearing
12
and of the disc
13
, a
2
is less than a
1
. In the end positions, the sleeves
25
,
26
strike the grooved ball bearing
12
and thus limit the axial displacement travel of the cylinder
1
. In addition, this stop system
11
means that damage is avoided in the event of any disruption to the electromagnetic system
14
,
15
. In the case of any possible disruption of this type, the cylinder
1
can run down to a standstill without any risk and without any further axial guidance. Sleeves
25
,
26
may strike the grooved ball bearing
12
, by which means any mechanical collision between the disc
13
and the magnetic coils
14
,
15
, and any associated damage, is avoided.
The stop system
11
having the grooved ball bearing
12
and the sleeves
25
,
26
can also be employed for very accurate axial positioning of the cylinder
1
, such as is required for example for the direct imaging of a plate cylinder in the printing machine. For this purpose, the magnetic coils
14
,
15
are driven such that the sleeves
25
,
26
of the cylinder
1
are in contact with the grooved ball bearing
12
. The ground bearing
12
performs the function of a supporting bearing and guarantees the highest accuracy with regard to the axial running of the cylinder
1
as it rotates. This axial stop can also be implemented in another way, for example by means of angled ball bearings or tapered roller bearings arranged in pairs.
FIG. 2
shows a further embodiment, in which one magnetic coil is replaced by a spring. For the purpose of simplification, in this exemplary embodiment and in the one following, in the case of repeated and similar components the same item numbers are used, if necessary with the addition of “0.1”, “0.2”. A cylinder
1
.
1
, by way of example not designed with a spindle and flange-mounted body, is cantilever-mounted with its journal
27
in the side wall
2
. The mounting is carried out in a bush
28
accommodated in the side wall
2
, otherwise in the latter by means of radial bearings
9
,
10
, analogously to FIG.
1
. Also provided is the grooved ball bearing
12
, which interacts with the sleeves
25
,
26
. In order to drive the cylinder
1
.
1
, a spur gear
29
is arranged on its journal
27
. The drive could also be carried out by means of a dedicated motor, for example in a manner similar to the design according to FIG.
1
. Fastened on the journal
27
of the cylinder
1
.
1
is a disc
13
of a ferromagnetic material, on one of whose sides, which supplies a ferromagnetic surface, and at a distance from the said side there is arranged a magnetic coil
14
. The magnetic coil
14
is fastened in a housing
30
which is flange-mounted on the side wall
2
. The housing
30
also accommodates a plate
31
, against which a compression spring
32
bears. The spring
32
is supported by a thrust bearing
33
on the journal
27
of the cylinder
1
.
1
.
The compression spring
32
in practice replaces a second magnetic coil. Its spring force is directed counter to the pulling force of the magnetic coil
14
. In order to hold the cylinder
1
.
1
in s specific position, the spring force maintains equilibrium with the force applied to the disc
13
by the magnetic coil
14
. For the purpose of displacing the cylinder
1
.
1
to the left, the pulling force of the magnetic coil
14
is reduced by driving it appropriately, so that the spring force predominates and the compression spring
32
displaces the cylinder
1
.
1
accordingly until the spring force and the force of the magnetic coil
13
maintain equilibrium. Conversely, in order to displace the cylinder
1
.
1
to the right, the energization of the magnetic coil
14
is increased, so that the disc
13
is pulled in the direction of the magnetic coil
14
and the cylinder
1
.
1
is displaced in this direction counter to the force of the compression spring
32
. In order to drive the magnetic coil
14
, a circuit is used which is similar to that shown in FIG.
4
. For the purpose of avoiding repetitive descriptions, more detailed explanations are omitted.
The grooved ball bearing
12
also has the functions (unchanged with respect to
FIG. 1
) of the stop of the stop system
11
, as collision protector and of a supporting bearing for the highly accurate axial running of the cylinder
1
.
1
. Continuing repetitive descriptions are therefore omitted. Reference should merely be made to the fact that in each case a distance a
1
, which is greater than the distance a
2
, has to be implemented between the plate
31
and the disc
13
and between the disc
13
and the magnetic coil
14
(see FIG.
2
).
FIG. 3
shows an embodiment in which, in a manner similar to
FIG. 2
, one magnetic coil is replaced by a spring. By way of example, a cylinder
1
.
2
is mounted with its journals
34
,
35
on both sides in respective side walls
2
,
36
. Used for this are radial bearings
37
,
38
, which permit the cylinder
1
.
2
to be displaced axially. The drive to the cylinder
1
.
2
is carried out by means of a spur gear
29
on the journal
34
.
A disc
39
of a ferromagnetic material is fastened to one end of the body
40
of the cylinder
1
.
2
. A magnetic coil
41
is positioned at a distance from the free side of the disc
39
, and is screwed to the wall
2
. In addition, a compression spring
43
bears on the journal
34
of the cylinder
1
.
2
with the interposition of a thrust bearing
42
and, by its other end, is supported on a cover
44
screwed to the side wall
2
.
In the same way as in the function with the exemplary embodiment according to
FIG. 2
, the force applied by the magnetic coil
41
and the spring force of the compression spring
43
maintain equilibrium, the cylinder
1
.
2
being held in a specific axial position. Depending on whether the cylinder
1
.
2
is to be adjusted axially to the left or right, the pulling force of the magnetic coil
41
is increased or reduced by means of appropriately varying its energization. The magnetic coil
41
is driven by a circuit, in a manner similar to that shown in
FIG. 4
, for which reason an additional description will be omitted in order to avoid repetition. One advantageous fitting of the measured value transmitter
22
used for the position of the cylinder
1
.
2
to the end of the latter is indicated in FIG.
3
. The apparatus according to
FIG. 3
also contains the stop system
11
having the grooved ball bearing
12
and the sleeves
25
.
1
and
26
. Here, too, the function is the same as in the preceding exemplary embodiments, for which reason reference is made to the description relating to the exemplary embodiment according to FIG.
1
. The distance a
1
between the magnetic coil
41
and the disc
39
, which must be greater than the distance a
2
between the grooved ball bearing
12
and the sleeve
26
, is indicated.
According to
FIG. 5
, by contrast with
FIG. 3
, no discs
39
are fitted to the ends of a body
40
of a cylinder
1
.
3
. Instead, the ferromagnetic ends of the body
40
of the cylinder
1
.
3
each interact with a magnetic coil
45
,
46
fitted alongside them in each case. Otherwise, the mounting of the journals
47
,
48
of the cylinder
1
.
3
in the side walls is similar to that shown in FIG.
3
. By means of the magnetic coils
45
,
46
, mutually opposed pulling forces can be exerted on the cylinder
1
.
3
. The cylinder
1
.
3
can be positioned depending on the driving of the magnetic coils
45
,
46
. By virtue of the ability to apply opposed forces, the provision of a spring
43
is superfluous. The further construction of the apparatus corresponds to that already described. Rings (similar to the ring
39
in
FIG. 3
) can also be fitted to both ends of the body
40
, with which rings the magnetic coils
45
,
46
interact.
According to
FIG. 6
, two discs
50
,
51
of a ferromagnetic material are fastened centrally to a journal
49
(or a spindle) of a cylinder not illustrated. In each case a magnetic coil
52
,
53
is positioned on the mutually facing sides of the discs
50
,
51
. Instead of this, the magnetic coils
52
,
53
could also be arranged on those sides of the discs
50
,
51
which face away from each other. Also, if there were two journals
49
present, a disc
50
,
51
together with associated magnetic coil
52
,
53
could be fastened on each. Using the magnetic coils
52
,
53
, mutually oppositely oriented axial forces can be applied to the discs
50
,
51
and therefore to the cylinder (not illustrated) in order to position it. The further construction and the functioning correspond to the exemplary embodiments already described.
In the exemplary embodiments, use is made of surfaces of discs
13
,
39
,
50
,
51
which interact with both sides or only one side with two magnetic coils
14
,
15
,
52
,
53
or only one magnetic coil
14
,
41
. These sides are advantageously flat and level. However, it is also possible for the sides to be curved to a specific extent, for example whilst maintaining rotational symmetry. It is also possible that, instead of fastening the disc
13
,
50
,
51
to the journal
3
,
27
,
49
of the cylinder
1
,
1
.
1
, these are designed as a constituent part of the respective journal
3
,
27
,
49
, for example as an extension. It is also possible to mount the ferromagnetic bodies containing the surface or surfaces such that they are axially undisplaceable, for example on the journal
3
,
27
,
49
. Surfaces of this type, which then do not rotate, do not need to be of continuous design but may have a hole for example. It is also possible, for example, for a journal of the cylinder to be mounted such that it cannot be axially displaced in a bush, which is shifted by means of the magnetic system.
The invention is not limited by the embodiments described above which are presented as examples only but can be modified in various ways within the scope of protection defined by the appended patent claims.
Claims
- 1. An apparatus for axially guiding and adjusting a cylinder for register position in a rotary printing machine comprising:an electromagnetic system arranged on a frame of the rotary printing machine and adapted to selectively apply an axial magnetic force to the cylinder in an axial direction; and mounting means for mounting the plate cylinder in the printing machine and enabling axial displacement of the cylinder, said electromagnetic system comprising: two mutually oppositely oriented ferromagnetic surfaces arranged on the cylinder; and a magnetic coil, each of said two ferromagnetic surfaces interacting with said magnetic coil.
- 2. The apparatus according to claim 1, wherein the cylinder comprises one of a plate cylinder and a transfer cylinder in the rotary printing machine.
- 3. The apparatus according to claim 1, further comprising a stop arranged such that the cylinder may be axially moved by said electromagnetic system against and onto said stop, said stop maintaining the rotating ability of the cylinder.
- 4. The apparatus according to claim 1, further comprising a stop system arranged on the cylinder and is adapted to maintain the rotating ability of the cylinder and limits axial displacement travel of the cylinder.
- 5. The apparatus according to claim 1, further comprising a register control system having an output connected to said electromagnetic system, said register control driving said electromagnetic system.
- 6. The apparatus according to claim 5, further comprising:a measured value transmitter for determining a position of the cylinder and generating a signal representative of the cylinder position; and a comparison element having a first input receiving the signal representative of the cylinder position, a second input connected to the register control system and an output connected to said electromagnetic system, said register control system providing predefined values to said comparison element via said second input.
- 7. An apparatus for axially guiding and adjusting a cylinder for register position in a rotary printing machine comprising:an electromagnetic system arranged on a frame of the rotary printing machine and adapted to selectively apply an axial magnetic force to the cylinder in an axial direction; and mounting means for mounting the plate cylinder in the printing machine and enabling axial displacement of the cylinder, said electromagnetic system comprising: a disk of a ferromagnetic material centrally fastened to the cylinders; and a magnetic coil disposed on each side of said disk.
- 8. The apparatus according to claim 7, wherein the cylinder further comprises a journal, wherein said disc is arranged on said journal.
- 9. The apparatus according to claim 7, further comprising a stop arranged such that the cylinder may be axially moved by said electromagnetic system against and onto said stop, said stop maintaining the rotating ability of the cylinder.
- 10. The apparatus according to claim 7, further comprising a stop system arranged on the cylinder and adapted to maintain the rotating ability of the cylinder and limit axial displacement travel of the cylinder.
- 11. An apparatus for axially guiding and adjusting a cylinder for register position in a rotary printing machine comprising:an electromagnetic system arranged on a frame of the rotary printing machine and adapted to selectively apply an axial magnetic force to the cylinder in an axial direction; and mounting means for mounting the plate cylinder in the printing machine and enabling axial displacement of the cylinder, said electromagnetic system comprising: two disks of a ferromagnetic material centrally fastened to the cylinder, said two disks having mutually facing and non-facing sides; and a magnetic coil positioned on one of the facing and non-facing sides of each of said two disks.
- 12. The apparatus according to claim 11, wherein the cylinder further comprises a journal, wherein said discs are arranged on said journal.
- 13. The apparatus according to claim 11, further comprising a stop arranged such that the cylinder may be axially moved by said electromagnetic system against and onto said stop, said stop maintaining the rotating ability of the cylinder.
- 14. The apparatus according to claim 11, further comprising a stop system arranged on the cylinder and adapted to maintain the rotating ability of the cylinder and limit axial displacement travel of the cylinder.
- 15. An apparatus for axially guiding and adjusting a cylinder for register position in a rotary printing machine comprising:an electromagnetic system arranged on a frame of the rotary printing machine and adapted to selectively apply an axial magnetic force to the cylinder in an axial direction; and mounting means for mounting the plate cylinder in the printing machine and enabling axial displacement of the cylinder, said electromagnetic system comprising a magnetic coil arranged at respective ends of the cylinder, each magnetic coil interacting with the ends of the cylinder.
- 16. The apparatus according to claim 15, further comprising a stop arranged such that the cylinder may be axially moved by said electromagnetic system against and onto said stop, said stop maintaining the rotating ability of the cylinder.
- 17. The apparatus according to claim 15, further comprising a stop system arranged on the cylinder and adapted to maintain the rotating ability of the cylinder and limit axial displacement travel of the cylinder.
- 18. An apparatus for axially guiding and adjusting a cylinder for register position in a rotary printing machine comprising:an electromagnetic system arranged on a frame of the rotary printing machine and adapted to selectively apply an axial magnetic force to the cylinder in an axial direction; and mounting means for mounting the plate cylinder in the printing machine and enabling axial displacement of the cylinder, said electromagnetic system comprising: a ferromagnetic surface arranged on the cylinder; a magnetic coil positioned adjacent said ferromagnetic surface; and a spring supported on the cylinder and having a spring force opposing a pulling force of said magnetic coil.
- 19. The apparatus according to claim 18, further comprising a stop arranged such that the cylinder may be axially moved by said electromagnetic system against and onto said stop, said stop maintaining the rotating ability of the cylinder.
- 20. The apparatus according to claim 18, further comprising a stop system arranged on the cylinder and adapted to maintain the rotating ability of the cylinder and limit axial displacement travel of the cylinder.
- 21. An apparatus for axially guiding and adjusting a cylinder for register position in a rotary printing machine comprising:an electromagnetic system arranged on a frame of the rotary printing machine and adapted to selectively apply an axial magnetic force to the cylinder in an axial direction; and mounting means for mounting the plate cylinder in the printing machine and enabling axial displacement of the cylinder, said electromagnetic system comprising a disk of a ferromagnetic material centrally fastened to the cylinder; and a magnetic coil arranged on one side of said disk.
- 22. The apparatus according to claim 21, wherein said disc is disposed on one end of the cylinder.
- 23. The apparatus according to claim 21, wherein the cylinder further comprises a journal, wherein said disc is arranged on said journal.
- 24. The apparatus according to claim 21, further comprising a stop arranged such that the cylinder may be axially moved by said electromagnetic system against and onto said stop, said stop maintaining the rotating ability of the cylinder.
- 25. The apparatus according to claim 21, further comprising a stop system arranged on the cylinder and adapted to maintain the rotating ability of the cylinder and limit axial displacement travel of the cylinder.
- 26. An apparatus for axially guiding and adjusting a cylinder for register position in a rotary printing machine comprising:an electromagnetic system arranged on a frame of the rotary printing machine and adapted to selectively apply an axial magnetic force to the cylinder in an axial direction; mounting means for mounting the plate cylinder in the printing machine and enabling axial displacement of the cylinder; a register control system having an output connected to said electromagnetic system, said register control driving said electromagnetic system; a measured value transmitter for determining a position of the cylinder and generating a signal representative of the cylinder positions; and a comparison element having a first input receiving the signal representative of the cylinder position, a second input connected to the register control system and an output connected to said electromagnetic system, said register control system providing predefined values to said comparison element via said second input.
Priority Claims (1)
Number |
Date |
Country |
Kind |
199 03 847 |
Feb 1999 |
DE |
|
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3746957 |
Forster et al. |
Jul 1973 |
A |
4606269 |
Jeschke et al. |
Aug 1986 |
A |
4785733 |
Hartung et al. |
Nov 1988 |
A |
5389846 |
Okazaki et al. |
Feb 1995 |
A |
Foreign Referenced Citations (5)
Number |
Date |
Country |
971 107 |
Dec 1958 |
DE |
3409 194 |
Sep 1985 |
DE |
62-32051 |
Feb 1987 |
JP |
63-13747 |
Jan 1988 |
JP |
1-210345 |
Aug 1989 |
JP |