Improvements in Photographic Printing Frames.
Year: 1897

page_text: Improvements in Photographic Printing Frames.
I, CHARLES AMBROSE MCEVOY, of 69, Victoria Street, Westminster, in the
County of Middlesex, Engineer, do hereby declare the nature of this invention
to be as follows:-
-
The object of my invention is to adapt photographic prin'ing frames such as
are described in the Specification of a former Patent granted to me No. 25579 in
the year 1896 for printing with film negatives. These printing frames are
formed of two wooden frames hinged together at one side so that they may be
closed together bookwise. One frame is to receive the negative the other the
paper or other surface to be printed.
To adapt such frames for printing with film negatives a plain glass plate is
placed into the recess on the inner face of the one frame instead of the glass plate
negative. The film is laid over the surface of this glass plate and is held down
on to it along two of its opposite side edges by two thin spring blades.
The spring blades may be of a curved form and made to extend beyond the ends
of the glass plate.
The central convex portion of each spring blade may be placed against the film
and one end of the blade may be passed through an eye fixed on the inner face
of the frame and the other end bent down and passed under a hook so that the
spring blade then becomes approximately straight and bears down upon the film
along its whole length.
The glass may be restrained from all endway movement by a block pressed
against one of its ends as described in the specification above mentioned or the
two spring blades above mentioned may be of sufficient strength to press the glass
downwards with sufficient force into the recess in which it lies to of themselves
keep the glass from moving endwise without any block being used to bear against
its end.
Improvements in Photographic Printing Frames.
I, CHARLES AMBROSE McEvoy, of 69, Victoria Street, Westminster, in the
County of Middlesex, 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:—
My invention relates especially to printing frames which are formed of two
wooden frames hinged together at one side so that they may be closed together

page_text: bookwise one frame being adapted to receive the negative the other the paj
or other surface to be printed. The object of my invention is to enable the frame.
to be used for printing with film negatives.
To adapt such printing frames for printing with film negatives a plain glass
plate is placed into a recess on the inner face of one frame. The film is laid over
the surface of this glass plate and is held down on to it along two of its opposite
side edges by two thin spring blades.
The spring blades are of a curved form and made to extend beyond the ends
of the glass plate.
The central convex portion of each spring blade may be placed against the film
and one end of the blade may be passed through an eye fixed on the inner face
of the frame and the other end bent down, and passed under a hook or it may be
an eye so that the spring blade then becomes approximately straight and bears
down upon the film along its whole length.
The two spring blades above mentioned may be of sufficient strength to press
the glass downwards with sufficient force into the recess in which it lies to keep
the glass from moving endwise, the frame can thus be used either for printing
with an ordinary glass plate negative or a film negative.
The drawing annexed shews various views of a printing frame formed in the
above way.
Figure 1 is a face view of the frame when open.
Figure 2 is a section on the line ab Figure 1.
Figure 3 is a similar section before the spring blade shewn in it has been bent
down and slid into position for holding the film.
In the drawing A is the paper or surface to be printed on, held in place in one
of the two frames as described in the Specification of a former Patent granted
to me No. 14376 in the year 1894 or in other equivalent manner.
B is a thin film negative! C is a plain glass plate on which this film rests.
The glass plate lies in a recess in the frame and is flush or nearly so with the
frames imner face.
DD are two curved spring blades for holding down two opposite edges of the
film on to the glass, or if an ordinary glass negative is used for holding down
such negative.
In Figures 1 and 2 both blades are shown in position resting upon two opposite
sides of the film both ends of each blade being bent down and passed under
metallic eyes E which keep the blade approximately straight and with its surface
level with the face of the frame. FF are grooves in the face of the frame which
the eyes E bridge over.
C
One end of each blade is bent upwards slightly as shown in Figures 2 and 3 to
facilitate the drawing the blades endwise to withdraw them from below the
eyes E.
To secure the film negative over the glass C one of the curved spring blades is
drawn endwise into the position shewn in Figure 3 so that one end of it is free.
One side edge of the film is then placed between the glass and this spring blade
and the free end of the blade is bent down on to the film and is then pressed
endwise to bring it into the position shewn in Figure 2 with its end which pre-
viously was free passed below the metallic eve F. One side edge of the film is
thereby securely held and the opposite side edge is afterwards similarly secured.
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. A photographic printing frame in which the negative to be printed from is
held down into a recess in the frame which is to carry it by two spring blades
bearing down upon two of its opposite side edges substantially as described.

page_text: 2. A photographic printing frame for printing with film negatives in which the
film is held against a flat glass plate by two spring blades nipping two opposite
side edges of the film between themselves and the glass substantially as described.
3. Photographic printing frames constructed substantially as herein before
described and illustrated in the drawing annexed