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Патент USA US3039402

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June 19, 1962
w. HOTOP ET AL
3,039,390
PRINTING CYLINDERS
Filed Dec. 21, 1959
Jnvenfors
mg”
United States Patent 0 F
3,039,390
1C6 v. Patented June 19, 1962
2
1
A preferred embodiment of the invention will now be
3,039,390
described with reference to the accompanying drawings
PRINTING CYLINDERS
in which
FIG. 1 is a longitudinal section, and
FIG. 2 is a section taken on the line A—B in FIG. 1.
many, assignors to Deutsche Edelstahlwerke Aktienge
FIG. 3 is a fragmentary View.
sellschaft, Krefeld, Germany
As shown in FIG. 1 three rings 2 are pushed on to a
Filed Dec. 21, 1959, Ser. No. 861,146
shaft .1 and secured by means of taper keys 3. The two
Claims priority, application Germany Dec. 27, 1958
end rings have external extensions 4 which form the end
6 Claims. (Cl. 101-378)
10 faces of the cylinder. The peripheries of the rings 2 are
formed with dovetail guide sections 5 on to which the
The present invention relates to improvements in print
soft iron bars 6 with permanent magnet plates 7 adhesively
ing cylinders as described and claimed in the speci?cation
Werner Hotop, Heinz-Gunter Meese, and Erwin Masjos
husmann, Dortmund-Aplerbeck, Ulrich Biihle, Schwerte
(Ruhr), and Giinter Ginzel, Dortmund-Aplerbeck, Ger
a?ixed thereto are consecutively pushed after registering
them with a suitable gap 5a in the guide sections 5. The
12, 1958.
In the said speci?cation a printing cylinder is described 15 soft magnetic bars with the attached permanent magnet
plates are assembled together to a cylinder with the rings
and claimed which comprises a support and an assembly
of patent application Serial No. 779,949, dated December
acting as supports in such a way that a sequence of poles
of magnet elements forming the stereo-holding cylinder
surface, the said elements comprising soft iron bars with
plate-shaped magnets magnetized across their thickness
applied, preferably adhesively secured, thereto. The ele
of alternating polarity in the peripheral direction will ap
pear. Rings 8 are shrunk on the extensions 4, the rims 9
20 of said shrunk rings retaining the soft iron bars 6 radially
in a tight grip.
When additional rigidity is required, the cavities be
tween the bars 6, the guide and retaining rings 2 and shaft
ments are arranged in side-by-side adjacency around the
axis of the support so that edges of the bars at the stereo
holding surface present poles around the periphery which
alternate in their polarity and each of which extends in the
direction of the cylinder generatrix.
In order to ensure that the magnetizable stereo shall
be securely held, as many poles as possible should be pro
vided in close juxtaposition round the periphery. This
brings about a distribution of the magnetic ?eld in which
the lines of force remain in the immediate vicinity of the
cylinder surface so that they will then all pass through
the relatively thin magnetizable layer of the stereo.
25
1 may be ?lled with a plastic or a low-melting metal.
The magnet elements shown are constructed as de
scribed in the speci?cation of the aforesaid application No.
779,949 and a more detailed description thereof is there
fore not given in this speci?cation.
What we claim is:
1. A printing cylinder for supporting a magnetizable
?exible stereo, comprising a support and an assembly of
magnet elements, said elements comprising soft iron bars
and plate-shaped permanent magnets magnetized across
their thickness, certain of said magnet elements having
with appropriately pro?led annular-guides for the cor 35 the north pole of the magnet at the interface between the
magnet and the soft iron bar and the remainder having
respondingly pro?led bars and while magnetic printing
the south pole at the said interface, said elements being
cylinders so produced are successful, the cores are some
alternately arranged in adjacency around the axis of the
what costly to produce in one piece.
support so that the longitudinal edges of the said bars at
According to the present invention, for the purpose of
To enable such an assembly to be produced around the
support, the support may be a cylindrical core shaped
simplifying production and saving material, the support 40 the said stereo-holding surface present alternating poles
comprises a shaft having separate rings arranged around
and secured to it and providing pro?led guides adapted
to permit the magnet elements, comprising the soft-iron
in a cylindrical surface, means spacing said poles in said
surface, said support comprising a shaft and a plurality
of separate rings secured thereto, said rings having pe
ripheral pro?led ring guide means and the said elements
successively around the rings and radially retained. The 45 having pro?led sections co-operating with said guide means
whereby the magnet elements have been guided round
guides formed by the rings may be of dovetail section and
the ring guide means into assembled position and means
preferably they are annular projections to co-operate with
permitting said elements to be brought into guidable rela
correspondingly contoured notches or grooves in the soft
tion to said peripheral ring guide means before movement
iron bars. If then an appropriate gap is provided in the
guides, the soft iron bars of the magnet elements appro 50 therearound.
priately selected for polarity may be successively regis
2. A printing cylinder according to claim 1, said sep
tered with the guides and displaced round the rings about
arate rings including end rings, said end rings having axial
the axis of the shaft until a cylindrical assembly of the
extensions, and retaining rings shrunk onto the said exten
magnet elements with peripherally alternating poles has
sions, the said retaining rings having rims which securely
55
been produced and can serve as the printing cylinder.
radially retain the magnet elements against outward dis
bars and the attached permanent magnets, to be assembled
Such a separate ring may be provided at each end and
so contrived that rings may be shrunk on to the same which
placement.
3. A printing cylinder according to claim 1, said guide
will radially hold the soft iron bars in a very tight grip.
means
being formed by annular projections of the rings
In order to improve the rigidity of the cylinder the
cavities between the magnet elements, the pro?led rings, 60 and of dove-tail cross-section and said magnet elements
and the shaft, may then be spun out with a solidifying cast
ing compound, such as a hardenable plastic or a low-melt
ing alloy. It has been found that a cylinder thus con- _
having co-operating dovetail notches, said projections pro
viding a local gap for registering the magnet elements one
by one with the said projections for assembly.
4. A printing cylinder according to claim 1, in which
trifugally ?lled, is well capable of sustaining the stresses 65 internal cavities are formed between the magnet elements,
the said rings and the said shaft and a solidifying casting
experienced during the printing process and can be eco
composition has been spun out in the said cavities and
nomically and simply produced.
structed, although perhaps the cavities have not been cen
3,039,390
4
3
has hardened to give additional rigidity to the assembly of
magnet elements.
5. A printing cylinder according to claim 4 in which the
said composition is a plastic.
6. A printing cylinder according to claim 4, in which 5
the said composition is a metal alloy.
References Cited in the ?le of this patent
UNITED STATES PATENTS
332,998
Coupland ____________ __ Dec. 22, 1885 10
343,621
596,014
676,513
1,657,287
1,916,777
2,833,009
Baker ________________ __ June 15,
Condon et a1 ___________ __ Dec. 21,
Price _______________ __ June 18,
Trist ________________ __ Ian. 24,
Trist __________________ __ July 4,
Horst ________________ __ May 6,
1886
1897
1901
1928
1933
1958
FOREIGN PATENTS
963,828
Germany ____________ __ May 16, 1957
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