Year: 1897

page_text: I, RUDOLF KRÜGENER, of 11, Königstrasse, Bockenheim, near Francfort on the
Mayn, Germany, Doctor, do hereby declare the nature of this invention to be as
follows:-
The object of this invention consists in an improved form of roll-holder, which
is constructed in such a manuer, that it may either be made use of independently
from, or in connection with the detective camera.
The roll-holder upon which flexible film has been hitherto wound up, constituted
an inseparable part of the camera, the film being unwound from one roller
and wound on to another roller, both these rollers being attached to the camera
walls.
My improved roll holder however forms an independent body and no part of it
is attached to the camera, the latter being thus fit for use without a roll-holder.
Being composed of two metal plates, which are screwed together by obliquely
arranged partition-walls, the improved roll-holder forms a body by itself, the said
walls at the same time preventing the light of the objective from penetrating to
the rollers.
Inside the body of my improved roll-holder are fitted four rollers, two being
small and merely forming runners for the film to pass over in its passage between
the spool-bolders. The other two are the usual large rollers fitted upon pins,
which are attached to the two metal plates mentioned above.
"
The film therefore runs from the supply-spool over the runners to the receiving-
spool, known as clamping reel." The latter is provided with a key for winding
up the film after exposure.
When made use of in a detective camera, my improved roll-holder, thus forming
an apart body, is placed into the camera, the key being then applied from outside.
After care has been taken, that the position of the film coincides with the plane
of the focussing screen, the camera cover is put on.
Another form of my improved roll-holder is described as follows:
A wooden board, which takes the form of the camera-cover carries the two larger
rollers, which may be hidden under partition walls. The film is kept in exact
register by two runners attached to the said cover in such a manner, that the
winding up of the film may be facilitated, the cover serving as table.
In case the camera should be used without roll-holder, the said wooden board
is replaced by an ordinary cover.
I do not lay any stress upon the special construction of the roll-holder, its
separability from the camera being the essential feature of my invention.
Dated this 29th day of November 1897.

page_text: Improved Form of Roll-holder for Photographic Purposes.
I, DR. RUDOLF KRÜGENEK, of 11, Königstrasse, Bockenheim, near Frankfort-
on-Main, in the Empire of Germany, 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: —
The object of this invention consists in an improved form of roll-holder, which
is constructed in such a manner, that it may either be made use of independently
from, or in connection with the detective camera.
The roll holder upon which flexible film has been hitherto wound up, constituted
an inseparable part of the camera, the film being unwound from one roller
and wound on to another roller, both these rollers being attached to the camera
walls.
My improved roll holder however forms an independent body and no part of it
is attached to the camera, the latter being thus fit for use without a roll holder.
In order that my invention may be more easily understood, I append the
following drawings:
Fig. representing the camera with the spool holders and screens, viewed from
above;
Fig. 1 giving a vertical view of the spool holders and the manner in which
they are mounted.
Figs. 2 and 3 show a modification in the method of attaching and screening
the spool holders.
C
In the first form the roll holder is composed of two metal plates a and b (Fig. 1),
which are screwed or fastened together by two obliquely arranged partition
walls c and d (Fig. 1). The whole thus forming a separate body, whilst the parti-
tion walls act as screens and prevent the light transmitted by the lens or objective
from falling on the spool holders and film there upon.
The improved roll holder contains four rollers, two of which and kare
small and merely act as runners for guiding the film in its passage from one spool
holder to the other. The other two f and y are mounted on studs or pins h
(Fig. 1), which are attached to the two metal plates a and mentioned above.
The film thus passes from the supply-spool f, over the runners i and k to the
receiving spool or "clamping reel" g. This latter is turned by a key and winds
up the film m subsequent to the exposure.
When employed in a detective camera, the improved roll-holder, which as
already stated, forms a separate body, is placed in the camera, the key being then
applied from the outside. Care is then taken, that the position of the film coincides
with the plan of the focussing screen, and when this is accomplished, the back
cover of the camera is put on.
The improved roll-holder may also be made in the following modified form:
The large rollers (spool holders) f¹ and ghidden or screened by partition
walls and, are mounted on a wooden board 1 (Figs. 2 and 3) forming the
back cover of the camera. In this case also, the film m is kept in exact register
by means of two runners and attached to the back cover in such a manner
as to facilitate the winding of the film. The back cover at the same time acts
as a table or backing for the stretched film m.
When it is desired to use the camera without the improved roll holder, the
board is replaced by an ordinary back cover (Fig. 1).
The main feature of the present invention being the provision of a separable
or detachable roll holder, no stress is laid upon the special construction of the
spool holders, which may be of any convenient form.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. An improved form of roll holder, constructed in such a manner, that it may
be separated or detached from the camera, so that the latter may be used either
with of without such roll holder, substantially as set forth and shewn in the
drawings.
2. A roll holder as characterised in the first claim, composed of two metal plates
screwed together by obliquely arranged partition-screening-walls, fitted with a
supply spool, a receiving spool and two runners for the film to pass over, substan-
tially as set forth and shewn in the drawings.
3. A roll holder, as characterised in the first claim, being arranged on a wooden
board, which forms the camera back cover and carries two larger rollers hidden
or screened by partition walls, the film being kept in exact register by two runners
attached to the said back cover, substantially as set forth and shewn in the
drawings.