Year: 1895

page_text: Date of Application, 29th June, 1895-Accepted. 3rd Aug., 1895
Figure 2 is a front view with the carriage raised;
;
Figure 3 is a vertical section, viewed in the direction of arrow of Figure 1
Figure 4 is a vertical section viewed in the direction of arrow y of Figure 1;
Figures 5 and 6 show a plan view and side view respectively of the adjusting
lever carrying the elastic type-plate.
Figures 7 and 8 show on an enlarged scale the mechanism operating the impression
hammers.
The arrangement of the machine is essentially as follows:-
A carriage e is adjustably arranged on a spindle in supports a.
A pawl e
engages in a fixed rack-bar d, said pawl being niovably arranged on a short lever f
which in turn is firmly connected with a spindle y mounted on the strengthened rear
part e of the carriage c. A spiral spring h, Figure 4, presses in such a way on the
pivot of the pawle that the double hinge formed by this pawl, and the lever f
always assumes the position shown in Figures 1 and 2.
A bar o oscillates the spindle and by means of a key o' may be pressed against
the double hinge ef, in such a way that the latter is expanded. As, by this means,
the pawl e engages in the rack bar d, the carriage c must be moved to the right, the
movement being so regulated as to be always to the extent of the width of a
tooth, that is to say the width of a letter.
By the opening or expansion of the double hinge e the spindle g is turned and
with it the lever i mounted on the upper end of this spindle g.
The lever thereby presses forward against the action of a spring a bar k
adjustably arranged under the carriage c. The bark has on its front end m which
has the form of a plate, a wedge piece m', which, on the bark being moved forward,
engages with a wedge surface n' of the impressing hammer n which latter rocks on
the spindle b.
By this means the impressing hammer is pressed down, and brings the required
type of the elastic type-plate on to the paper which lies beneath it.
When the wedge surface m¹ has passed completely off the wedge surface n' of
the hammer n, the latter is thrown upwards by the elasticity of the type-plate,
so that the wedge surface m', on its return movement, slips away under the wedge
surface without exerting any pressure on the same.
By this arrangement an equally strong impression is always obtained on the
paper, it being immaterial whether the operator presses heavily or lightly on the
key o¹.

page_text: The distance between the plate m and the under side of the carriage e, is
regulated by means of a screw q. By turning this screw to the right, or left, the
pressure of the wedge surface in on the wedge surface n may be regulated at will
and thereby the strength of the impression which is to be produced on the paper.
The type-plate is carried by a frame which is made in one piece with the
lever, by which the type-plate is adjusted to the desired letters.
The rear end of the frame is connected with a circular guide disc s, Figure 5,
which moves freely in a straight guide arranged on the under side of the transport
carriage c.
"
This arrangement of making the frame of the type-plate in one piece with
the levert, and the guide dises, renders it possible to easily replace the type-plate
by another having another pattern of type,
In order to effect this change of type-plate, it is merely necessary to remove the
inking-plate on which the type-plate rubs and to draw the frame
together with
levert and disc s, out of the guide , and to replace it by another, having an ther
pattern of type.
The means for adjusting the lever t, and for moving forward the paper are the
usual ones, which being well-known need not be here further described.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is :-
1. A typewriting machine having elastic type-plate, and characterized by the
arrangement by which the movement sideways of the carriage (e) to the extent of
the width of a letter, and the downward movement of the hammer (n) for impressing
the selected type on to the paper which is held below, is brought about simul-
taneously by pressure on a pawl (e) engaging with a fixed rack-bar (d); substantially
as hereinbefore described and shown on the accompanying drawing.
2. In a typewriting machine such as described in Claim 1, the arrangement by
which the movement of the pawl (e) moves forward a bar (k), which by this forward
movement presses by means of a wedge surface (m) with an adjustable pressure on
the impressing hammer (n), and on its return movement, which is effected by the
action of a spring, slips away under the hammer (»), said hammer being thrown up
by the elastic type-plate (1), substantially as herein before described and shown on
the accompanying drawing,
3. In a typewriting machine such as described in Claim 1, the arrangement by
which the frame (r) of the type-plate (r) is made in one piece with the adjusting
lever (t) and the guide disc (s) for the purpose of enabling the said frame and
type-plate to be more easily changed, substantially as described.
Dated this 28th day of June 1895.
WM. P. THOMPSON & Co.,
Agents.