Improvements in Dark Roller Slides for Photographic Purposes.
Year: 1888

page_text: Improvements in Dark Roller Slides for Photographic Purposes.
I, STEPHEN JAMES HOLLIDAY of Imperial Chambers, Colmore Row, Birmingham
Architect, do hereby declare the nature of this invention to be as follows:-
My invention has for its object the simplification of apparatus for the exposure o
portions of continuous rolls of sensitised paper, and comprises the method of properly
straining such portions of sensitised paper across the focusing plane; and also the
means of accurately measuring and indicating the amount of paper exposed from the
outside of camera dark slide.
In the drawings appended Fig. 1 represents the dark slide in section. Fig. 2 is a
side view of the slide. Enclosed in the dark slide is the roller A, containing the
sensitised paper; B. a roller upon which to roll the paper after exposure; C, the
measuring roller, one end of which passes through the side of box and to which is
attached the Indicator disc C. 1. This disc has a volute groove cut in its surface, in
which engages the turn down point of lever K which is pivoted on K. 1. D, is a
fixed centre point to carry end of Roller A. D. 1. is a similar point engaging in end
of Roller B, but moveable with plate E. E has projections F on its surface of suitable
shape corresponding to recesses in end of roller. G. is a milled head attached
to plate E. His a ratchet, pawl & spring. I is a double ended flat spring
carrying two centre points which enter ends of rollers A & B. J is a similar but
stronger spring, through which pass the two centre points on I. L. L. are spring
pushes for the purpose of puncturing the paper to shew the limits of picture. M. is
the front face of slide & has a slot in each end to enable the paper to be passed
through.
In operation, Roller A with its coil of paper is inserted in the box part of slide by
pressing down the springs I & J, the end of paper is then passed around roller C to
the front face of slide M. passing thence inside box around M. 1 to the roller B and
there secured. The point of spring lever K is entered in one end of groove in C 1.
On the operator then turning milled head G (the ratchet preventing turning in

page_text: wrong direction) the paper is rolled from A. upon B. the measuring roller being
turned round, the spring lever K is moved from one end of slot to the other and acts
as a stop and indicator of the quantity rolled. The necessary friction to. strain the
paper is applied by the springs I & J upon ends of rollers A & B.
COMPLETE SPECIFICATION.
Improvements in Dark Roller Slides for Photographic Purposes.
I, STEPHEN JAMES HOLLIDAY of Imperial Chambers, Colmore Row, in the City of
Birmingham, Architect and Surveyor, 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 improvements in, or additions to, dark roller slides for
photographic purposes, and consists 1st, in giving tension or stiff running to the spool
and receiving rollers, thereby preventing slack feed. 2ndly in removable pivot centres
for the rollers. 3rdly in a clip, for securing the inner end of a sensitized paper
length to the receiving or winding roller. 4thly in a pricker for puncturing the
paper at determinate or other distances, equal to an exposure, or part of an exposure,
and 5thly in a measuring wheel.
Figure 1 of the accompanying drawings represents a back side view of a dark
roller side, constructed and arranged according to my invention. The said view
represents the principal parts mainly in elevation, with some of the parts in
section.
Figure 2 represents a longitudinal vertical section of the said apparatus upon the
dotted lines A B of the said figure 1, and figure 3 represents a like section as
figure 2, but with the rollers removed, so as to show in elevation, the tension plates,-
and the removable pivot axes carried upon the inner faces of spring arms, which are
arranged only upon one side of the apparatus.
Figure 4 shows the sensitized film measuring wheel, for determining when an
exposure has been wound, or partly wound upon the receiving and winding roller.
Figure 5 shows the ratchet wheel arrangement of the receiving roller, whilst
figures 6 and 7 show the inner end of the "turn" of the ratchet wheel, and the end
of the roller with which it is connected.
The same letters of reference indicate corresponding parts in the several figures.
a is the slide, consisting of a rectangular shaped box, provided with a hinged
skeleton lid or cover, common to photographic slides of this class.
The front of the slide has a bed a², upon the front face or outer side of which, the
sensitized paper o, to be exposed, is intermittently drawn from the continuous length
wound around the spool roller b, by a winding and receiving roller c, and over a measuring

page_text: roller d, disposed at a short distance from the said receiving roller. Thus, the web;
or continuous length of unexposed sensatized paper, is wound upon a spool roller at
one end of the slide, and at the other end after exposure, upon a receiving and
winding roller, which draws the length or continuous web over a measuring roller,
through an opening at in. the fore part of the slide, and through a second and rear
opening as, and finally over a swell end a³ of the said bed.
The rollers band caredetachably mounted, and are provided with tension plates e, which
give end pressure to the rollers, and thereby prevent loose feed, or loose winding, as the
free ends of the said tension plate or plates spring outwardly, and give the rollers end
pressure, which thus allows them only to return or revolve stiffly upon their pivots
or axes 62, c², the former of which is carried by an attachment plate 63, while the latter
works within bearings made through the side of the slide.
The Roller pivots 92 at the tension side of the rollers, passed through holes in
the tension plates, and are carried by spring arms fg, whose inner ends are fixedly
connected to the tension plates, or. to fixed carrying brackets carried by the slide,
while their outer free ends f, g, form handles for pressing back the arms for taking
the pivots carried by them, out of the pivot holes in the ends of the rollers, when they.
are required to be taken or removed from the slide.
↑
The winding and receiving roller has an undetachable turn e³, consisting of a boss,
with a ratchet wheel at its foot part, with a neck c³, and a snug plate c³, and
pivot c.
The snugs on the face of the plate as best seen in figure 6, takes into like channels
or grooves made within the end of the roller, as best seen in figure 7.
The ratchet wheel which allows the receiving roller to turn in one direction only,
has an ordinary jointed pawl c', pressed home by a spring c.
The receiving roller is provided with a clip h, consisting of a strip of metal, secured
to the roller, and slit longitudinally about its middle, wherethrough the end of the
paper to be received, is passed.
The near side axis of the measuring roller, has a measuring wheel i consisting of a
helical groove 2 sunken within its outer face, and wherein the hooked end of a
spring tracer passes; so that on the measurer, making two revolutions, a length of
paper has been wound upon the receiving roller, equal or nearly equal to the length of
the bed, and which length is determined by the hooked end of the tracer or spring
arm as aforesaid, falling into a hole at the inner end of the helical race or groove,
thereby locking the measuring roller, which is only relieved by removing the said free
end from the hole, and placing it at the outer end of the helix.
The tension plates are made to bear more or less upon the ends of the rollers, by a
set screw k, which screws through a fitting in the side of the frame of the slide, and
takes its bearing upon the free end of the said plate.
Set screws are preferably fitted to both of the tension plates, although only one is
shown.
Situated at the spool roller end of the slide, is a hand pricker or movable spike,
which pierces or punches the paper at determinate or other distances, in order to
indicate the division between the exposures, or undeveloped pictures.
The pricker consists of a pusher 1, with a stalk whose inner end is inclined, and
upon which, the rounded inner end m², of a spike m takes its bearing, and is kept up
to it, and the pusher of the pricker pressed back by a coiled spring n. Thus, by
pressing inwards the pusher, protruding end 1, the incline at its inner end, forces
outwardly the spike, and punctures the paper stretched over the shell of the bed,
wherethrough the spike passes.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed I declare that what I
claim is
First: Applying end pressure to the rollers, or to the spool and receiving rollers
of dark roller slides, by springs or their equivalents, whereby slack or loose winding,
or feed, is prevented.

page_text: Secondly Giving drag, or tension to the spool and winding rollers of dark roller
slides, by tension plates, consisting of flat plates pressing upon the ends of the rollers,
in the direction of their axes, substantially as described and set forth.
Thirdly Adjusting the pressure of the tension plates e of dark roller slides, by
set screws as set forth.
:
Fourthly Carrying the pivots, or the bearings, of the rollers of dark roller slides,
upon, or by means of springs or spring arms g, whereby the said pivots or bearings
become self adjusting, substantially as described and set forth.
Fifthly-The combination with a receiving and winding roller of an undetachable
fitting (with ratchet) c³ c c ce, as set forth.
Sixthly Providing measuring rollers, of dark roller slides, with a measuring
wheel, or lock measuring wheel i (with or without i³) j j³ as set forth.
.
Seventhly-The combination with a dark roller slide, of a hand pricker, whereby
the division between the undeveloped pictures of an exposed superfice, of sensatized
paper, is indicated, by a puncture, or by punctures.
Eighthly A hand pricker consisting of a pusher 11212 and spike m m² with
spring n as set forth.
Ninthly Providing one end, or both ends of dark roller slide beds with swells or
enlargements as set forth.
LastlyThe construction and arrangement of the parts of dark roller slides as
described and set forth.
Tinted the nth d
1000