Improve:nents in the Production of Templets or Diagrams for Card- punching and other Weaving Machines.
Year: 1899

page_text: Date of Application, 21st Dec., 1899-Accepted, 20th Oct., 1900
COMPLETE SPECIFICATION.
Improve:nents in the Production of Templets or Diagrams for Card-
punching and other Weaving Machines.
I; JAN SZCZEPANIK, of III, Ungargasse 12, Vienna, Austria, Engineer, do
hereby declare the nature of this invention and in what manner the same is
to be performed to be particularly described and ascertained in and by the
following statement:-
-
This invention relates to a process for photographically producing from ob-
jects, patterns, or reproductions of objects, metalic templets or diagrams (here-
inafter called templets) each composed of conducting and non-conducting portions
for electrically driven weaving machines, as Jacquard machines and dobbies,
and also for electrically driven card-punching machines.
The several steps of the process are modified, as will be hereinafter more
particularly explained, in order that the current-interrupting parts, which are
iormed by an insulating layer, may, as required, be thick or thin, as it may be
for card-punching machines and for machines in general that take little current.
In carrying out the process a reduced negative of the object, pattern, or repro-
duction (hereinafter referred to as a design) is obtained photographically, and
from that, after development, another photograph is taken through a screen,
whereby a positive diagram is obtained.
This diagram can either be taken on sensitive paper and transferred to a
metal plate, or be produced directly on the metal plate by photography.
In the former case, the photographic positive to be taken through the screen,
is produced on a translucent material-preferably silver-bromide paper, which
after development is rendered translucent (capable of being copied) by oil of
turpentine or vaseline oil-and then either a negative of this positive is made
on pigment paper and transferred to the metal plate, or the positive which is
to be produced through the screen is projected direct to the metal plate, which
in the same manner as previously stated with regard to paper, is covered with
a layer of a suitable pigment, for which a suitable vehicle is gelatine, fish-glue,
india-rubber, or asphaltum.
In the second case, with a view to the direct production of the positive diagram
on the metal plate, a highly light-sensitive emulsion, such as is used in photo-
graphy, is after laying on one or more insulating layers of lac for instance,
applied to the layer of pigment placed on the metal plate, the object being to
overcome the difficulty caused by the low light-sensitivity of the layer of pig-
ment. A photograph is taken through the screen on this sensitive layer and
fixed as usual. Then the plate is
the picture is developed and
exposed again and
longer time
the light, whereby the
picture on the first surface is copied, through the insulating layer, on the layer
of pigment carried by gelatine, fish glue, india-rubber, or asphaltum. During
the development of the pigment picture, which takes place in the known way
in lukewarm water, the light-sensitive and insulating layers and also the un-
developed portions of the pigment layer dissolve away and the negative pigment
picture remains on the metal plate.:
for a
to
In this way places of current interruption are produced on the metal plate by
portions of the insulating layer sufficiently thick even for high-tension cur-
rents, and therefore for large electrical weaving-machines.

page_text: In the case of electrical card-punching machines, for which a very thin insulat-
ing layer is sufficient, since they work with low tension, it is not necessary,
before photographing through the screen, to apply a layer of pigment to the
metal plate, and the highly light-sensitive material may be applied to the
plate itself, which should be previously silvered in order to prevent the decom-
position of the emulsion which is to be applied on the metallic plate and which
if it were applied directly to the metallic non-silvered surface might be decom-
posed & spoiled; in this case development is carried out with a tanning developer
--for example, a mixture of pyrogallol and an alkali-and it is then fixed and
washed so as to remove the unilluminated parts.
The metal templet produced in any of the ways hereinbefore described is
finally treated with alum solution or with formalin, in order to harden the
current-interrupting layer; when fish-glue is used as a vehicle for the pigment,
the hardening may be effected by burning-in the layer in enamel fashion.
If, as is often the case, it is desired that the templet appear as a negative
the positive produced on a strongly light-sensitive layer is developed by means
of a developer which has no tanning properties, as for instance hydroquinone,
is then fixed and washed and afterwards placed in a weak bath of ammonium
persulphate, (NH) SO, whereby the tanning of the parts not attacked by the
light is effected, whilst the parts which are attacked by the light and have
blackened in consequence of development, are bleached or become of a yellowish
colour. Then it is finally washed in tepid water and wiped over with a cotton
pad, whereby the parts that have been attacked by the light, blackened and
then bleached, are washed out.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:-
:―
1. A process for the production of metallic templets for electrically driven
weaving-machines by means of photography, in which a reduced photographic
negative is obtained from the design and this, after development, is photo-
graphed through a screen on a light-sensitive surface, which is applied either to
a translucent material or to the metal plate itself, whereupon in the first case
the positive developed in the usual way or a copy thereof, is transferred in
conjunction with the use of pigment, to the metal plate, whilst in the latter
case it is treated with a tanning developer, and in both cases, after washing it
is hardened or burnt in.
2. In producing metallic templets according to the preceding claim, applying
a highly sensitive layer to insulating material superposed on a layer of pigment
on the metal plate, photographing the developed negative through the screen
on the said highly sensitive layer, developing and fixing the picture or diagram
so produced, and finally copying the said picture or diagram on the layer of
pigment by a longer illumination.
3. In producing metallic templets according to Claim 1, treating the positive
picture or diagram produced on the metal plate with an ordinary developer
fixing and washing it, treating it with persulphate of ammonium, and finally
further treating it in tepid water, for the purpose of obtaining a negative picture
or diagram on the metal plate.
4. Producing metallic templets composed of conducting and non-conducting
portions, substantially in the several ways hereinbefore described.
Dated this 21st day of December 1800
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.