An Improved Tracing Apparatus, and Appliances in connection therewith.
Year: 1891

page_text: Date of Application, 17th Aug., 1891-Accepted, 3rd Oct., 1891
COMPLETE SPECIFICATION.
An Improved Tracing Apparatus, and Appliances in connection
therewith.
I, ALFRED WYNS, of Münster, in the Province of Westphalia, in the German
Empire, do hereby declare the nature of this invention to be as follows:-
My invention relates to those copying apparatus, whereby the drawing of one
sheet is traced upon another by the aid of light penetrating the same, and the object
is to increase the effect of the light. 1 attain this object by a mirror, which gathers
the rays of light and throws them against the drawing to be traced.
In order to make my invention well understood, I refer to the accompanying
drawing, in which similar letters denote similar parts throughout the different views
and in which :--
Fig. 1 is a partly sectional elevation of the tracing apparatus,
Fig. 2 is a cross-section,
Fig. 3 a plan of the sanie and
Fig. 4 is a spring-clasp for holding the papers to the glass.
The sheet of glass g is embedded into a wooden frame F and is adapted to have
the drawing and blank sheet to be stretched over it, for the sake of tracing the
first upon the latter. The frame F is hinged to the rack at its higher hinder end r,
from which side the light is supposed to come. At the front lower end the frame F
is provided with notches k, wherein small posts p catch. These posts have a row
of holes, into which a pin may be stuck for adjusting its height.
Spring pawls rest with their upper bearing ends against the teeth of the rack,
thus supporting the frame F in any requisite height. A strings is tied to both
spring-pawls and is led from one to the other by way of the two eyes o on the
front of the frame. Thus by pulling on the strings at the front, the pawls farc
disengaged from the racks r, and the frame may be lowered or raised according to
need. A second frame R, being preferably made of iron, is resting by two pivots a,
on the sides of the main framing whereon the same may slide up or down, in the
direction of their length. This latter frame encircles the mirror S, which may be
a parabolic-hollow-or a plane-mirror made of glass or metal, and which may
also swivel in its axis c-d, having a check-screw w for locking the mirror in any
desired position.
Now the rays of light falling on the mirror S, are recast against the sheet of
glass g, and the paper of the drawing being more or less transparent, will permit
the tracing of the drawing, on the drawing-or other strong paper like unto thin
tracing-paper.
Although the mirror at its most curved parts will catch the weaker rays, yet by
gathering the same, the front and middle part of the glass will receive the most
powerful light, which by turning the mirror may be cast to any desired part of the
glass, which besides receives the direct light.
The top of the glass may be shaded by curtains, which prevent direct light to
fall on the glass from above. For this purpose the apparatus is furnished with
curtain-holders v.
In Fig. 4 I illustrate a spring-clasp for holding the two sheets of papers firmly
stretched across the glass. This clasp consists of two parts a and b preferably
made of thin sheet metal. The under part a is merely a straight piece, while the
other bis joggled at the centre. Both are provided with lugs c one on each side, in
such a manner, that their centre holes stand opposite each other, when a and b are
put together, as illustrated on the drawing. A double-blade-spring f¹ is inserted
between a and b, where the same are standing apart, in such a manner, that their

page_text: bearing ends resting against the inner faces of the parts a and b tend to force them
asunder. A pin t holds the complete article together.
Now this inay be of use by inserting the sheets, both drawing and tracing,
between a and the spring f' whereby they are firmly held together. Several such
clasps may be employed, round about the edges of the paper and these may be
stuck to the frame F with drawing-pins. For this purpose the clasp is provided
with small holes h. Of course clasps of this kind also may be made use of for other
purposes, where it is required to hold two or more sheets of paper together, also
for mounting paper on drawing-boards without injuring the edges of the sheet.
My tracing-apparatus also may be employed for producing copies by the direct
action of the light on chemically prepared papers, such as blue-copies and the like.
In this case the frame F and plate of glass g may be replaced by any of those
known apparatus, usually employed alone for such purpose. Thereby the mirror S
will enable the copying to be performed in gloomier weather, than has been possible
heretofore, and at all events shorten the time such copying will take. The
apparatus when employed for this purpose will be placed upside-down to the position
shown in the drawing.
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. The combination with a tracing-apparatus of a mirror adapted to cast the
reflecting light combined with the direct light against the drawing to be traced as
set forth.
2. A tracing-apparatus consisting of a frame F being vertically adjustable and
having a sheet of glass g, in combination with a curved mirror S being adapted to
swivel about two axes standing at right angles to each other as for the purpose set
forth.
3. The combination of a tracing-apparatus having a reflecting mirror adapted to
swivel about its axis in such a manner, so as to cast the reflecting light combined
with the direct light against the drawing to be traced, and means for mounting
both sheets of paper, drawing and tracing on the frame of the apparatus, as for the
purpose set forth."
4. In combination with a tracing apparatus as set forth in the preceding claims,
the employment of spring-clasps consisting of an upper part b, being joggled near
the middle, and a lower part a, both, and a having side lugs c and being held
together by a pint in combination with a double-blade-spring f¹ being inserted
between the parts a and b, where the same stand apart from each other, in such a
manner, that the same is also held by the pin t and its bearing ends rest against the
inner sides of the part a and substantially as set forth and shewn by the
accompanying drawings.
11 1
1001
ALFRED WYNS.
By Geo. Thos. Hyde,
4, Moorfields, London, E.C., Agent for the Applicant.
ALFRED WYNS.
By Geo. Thos. Hyde,
4, Moorfields, London, E.C., Agent for the Applicant.