STENCIL PRINTING FRAMES
Year: 1888

page_text: I, GEORGE HOWLETT DAVIS a citizen of the United States residing at Washington,
District of Columbia, U.S.A. an employe of the United States Government, do hereby
declare the nature of my invention for STENCIL PRINTING FRAMES, 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 to that class of duplicating apparatus which employs a printing
stencil over which an inked roller or scraper is passed, and has for its object to
provide an inexpensive and practical device for automatically delivering the sheets
after they have been printed.
In the accompanying drawings-
Fig. 1 shows a duplicating apparatus elevated on a box with the printing frame
opened with a plain sheet of paper with the front edge curled B¹ ready for printing.
Fig. 2 shows the same apparatus with the printing frame opened delivering the
paper after printing.
Similar letters refer to like parts throughout the several views.
A is a printing frame and is hinged to the printing board A2 in the manner shown E
the said printing board A2 is cut out between the hinges A¹ so that when said printing
frame is raised there will be an enlarged longitudinal opening A¹ between the hinges.
The printing stencil F is shown with two small air holes made through it near the
corners of the printing frame next the hinges.
The operation of my invention is as follows:-
1st., the supply of paper to be printed is slightly bent or curled so that when a
sheet is laid on the printing board the concave will be up B' and running parallel
with the mouth. Five hundred. or more sheets can be properly bent in a moment by
bending their sides or ends together, according to the way they are to be placed on the
printing board, and the direction they are to deliver.
A sheet to be printed is placed on the printing board and the printing frame closed,
after the roller has been passed over the printing stencil the printing frame is raised
rapidly either automatically or by hand owing to adhesion and suction the printing
sheet raises part way with the printing stencil until its own weight, assisted by the air
19

page_text: coming through the air holes detaches it from the stencil whereupon it drops in a
slanting direction through the opening at back of frame A¹ onto the table beneath, an
obstruction being placed at a convenient distance on the table so as to stop the sheets
and cause them to drop one on top of another D as fast as they are printed. The
inner side of the printing frame may be rounded off if necessary so as to slide the
lower edge of the detached sheet into the opening A' in case it should strike the said
:side in dropping.
In most cases it is not essential to make airholes through the printing stencil as the
weight of the sheet alone is generally sufficient to cause it to drop froin the stencil at
the proper time, but the air holes are necessary when the sheets adhere to the stencil
too long.
It is obvious that my invention can be applied to all classes or constructions of
duplicating apparatus employing a printing stencil by making an opening of sufficient
size in such a position that when the sheet drops from the stencil it will fall through
the opening substantially as described..
:
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
1. In a stencil frame the printing board and stencil holder so constructed or
arranged that an enlarged longitudinal opening is made between the stencil holder
and printing board, between the hinges on raising the stencil holder substantially
as described.
2. In a duplicated apparatus the combination of a printing stencil and printing
board so constructed or arranged that a sheet upon being raised from the printing
board by means of the suction of the stencil sheet drops through an opening con-
structed between the stencil and the printing board.
3. In stencil printing the use of paper bent or curled as described to facilitate the
stencil lifting the copies from the bed to be dropped through the opening substantially
as herein described.
2.
Dated this 25th day of August 1888