Apparatus for Coating, Roughening, or Graining Metal Plates.
Year: 1885

page_text: Apparatus for Coating, Roughening, or Graining Metal Plates.
I, HERBERT JOHN HADDAN, of 67 Strand, in the City of Westminster, Civil
Engineer, do hereby declare the nature of said invention for APPARATUS FOR
COATING, ROUGHENING OR GRAINING METAL PLATES, a communication to me from
abroad by Julius Wezel, of the firm of Wezel and Naumann, Manufacturers, of
Reudnitz, in the kingdom of Saxony, to be as follows:―
This invention has for its object to provide metallic plates with a thin layer of
lithographic stone, but is generally applicable for providing metal-plates with an
adhesive layer and for roughening or graining metallic surfaces.
The apparatus comprises a revolving drum adapted to be heated from the inside
and to carry on its surface the plates to be coated; also several spray-producers or
rows of nozzles distributed so, that during the revolution of the drum every part ·
of its circumference.is alternately moistened by the same and allowed to dry.
Also a washing-tank and a set of automatically movable brushes placed so, that
the circumference of the drum dips into the said tank during a part of its
revolution and is subsequently brushed.
In order to roughen or grain the surface of the metal-plate, the spray-producers
are replaced by some blast apparatus and the heating appliance is set out of action..
The plates are preferably mounted on hollow segments secured to the arms of
the drum, which arms are likewise hollow and serve to convey steam or other
heating fluid from the hollow drum axle to the hollow metallic segments, and. then.
back to the axle each segment being arranged so as to bridge over a pair of arms.
On each hollow segment can be mounted a metal-plate, either by bending the
ends of the plate. inward over the edges of the segment, and then securing them
by means of a wedge or key, interposed between two contiguous segments,. or
by leaving the edges of the metal-plate plain and securing them by means of a
flanged key or anchor placed between contiguous segments, the key, anchor or
wedge being provided with a screw-spindle and nut for tightening them.
The movable brushes may receive a to-and-fro. motion parallel with the axis of
the drum by means of excentrics. and an intermediate shaft driven from. the main;
driving shaft by means of a belt and pulleys.

page_text: Apparatus for Coating, Roughening, or Graining Metal Plates.
I, HERBERT JOHN HADDAN, of 67, Strand, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by Julius Wezel, of the firm of Wezel and Naumann, of Reudnitz,
Germany, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :—
Litho-plates applicable for lithographic or other purposes may be made by
providing metal plates with a layer or coat, which has the same qualities as litho-
graphic stone. In certain cases, for instance, for chalk or crayon drawings, these
litho plates must also be grained before coating, for causing the layer to adhere
better to the stone.
The apparatus represented by Figs. 1 to 4 of the accompanying drawing serves
to attain the said purposes.
The construction and action of this apparatus are as follows:
The metal plates are clamped on the circumference of a cylinder formed of
hollow plates heated or not, and in this state the plates are conducted slowly
rotating in front of atomiser or sprinkling nozzles, which project the coating
substance in the shape of a mist on the surface of the plates. The coated plates
get during their rotation, for instance in their lowest position, into a water reservoir,
in which they are washed, for which purpose the water in the reservoir may be at
rest, or set in a wave-motion by mechanical means.
After leaving the water bath, the plates are carried along a brushing mechanism,
which relieves them of the excess of coating.
The following is the special arrangement of the apparatus:
The cylinder A is provided with the partly bollow axle B, which, by means of
arms CC carries the hollow supporting plates D.
The hollow plates D are traversed by steam, hot air or other heating means; for
instance as shown by Fig. 2, the steam flows in at the pivot b; proceeds through
the arm C to the plate D, from which it escapes again, to the outlet tube d through
the arm C. At the extremity or in the conduit of the outlet tube a steam trap
may be placed at any convenient spot.
Thus the supporting plates D are heated; and at the same time the plates E
mounted thereon and on which the coating substance is projected in the shape of
a mist, the layer drying fast, until the plate passes a second row F₁ of nozzles, by
which it is again provided with a layer of coating mass, so as to thicken the first
layer.
In the same manner, the process is repeated according as a thin or a thick layer
is intended to be put on the plate. The plates E may be provided with bent
rims or flanges clamped upon the plates D by means of fastening wedges a, Fig. 3,
or by any other suitable means.
If the plates are intended to be attached without bending up a rim, a holding
rail e may be employed, Fig. 4, which is tightened by means of a screw f.
The machine is actuated from the axle G, which also sets in motion the brushing
work H.

page_text: If the plates are intended to be roughened or grained previous to the application
of the layer, sand blasts are applied instead of the nozzles. In this case the
heating of the plate is dispensed with. Likewise the washing and brushing
mechanism may remain out of action.
.
The apparatus is generally applicable for coating metal and other plates with
a layer of adhesive material.
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be performed, I declare that what
I claim is:-
1. Apparatus for coating plates or for graining or roughening the surface of the
same, comprising in its construction a revolving cylinder heated from the inside
and carrying on the outside the plates to be coated or grained, and several series of
atomiser or sprinkling nozzles arranged so that during its revolution the cylinder
is alternately moistened by the same, and dried.
2. In the apparatus specified by claim 1, the arrangement of the washing
trough B and brushing appliance H.
3. Apparatus constructed as described by claim 1, but provided with a sand blast
apparatus instead of the rows of liquid nozzles, for the purpose of roughening or
graining metal plates.