Improvements in Type Writers.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in Type Writers.
A communication from abroad by Messrs. WYCKOFF, SEAMANS & BENEDICT, of
.
327, Broadway, New York City, New York, United States of America, a
Corporation organized under the laws of the State of New York.
I, JOHN CORRY FELL, of the Firm of Fell & Wilding, of 1 Queen Victoria
Street, in the City of London, Chartered Patent Agent, 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 type writing machines mainly of the class known as
"The Remington," and the objects of the improvements are to provide a simple
and durable escapement mechanism for the paper-carriage. I attain these objects
by means of a single rotatory dog wheel in connection with a duplex rack and
ineans to advance the same, as hereinafter described and pointed out in the claims.
In the accompanying drawings,
Figure is a rear view of a portion of a Remington type writing machine
showing this invention applied thereto.
Figure 2 is a longitudinal vertical section of a portion of the same.
Figure 3 represents on an enlarged scale a top view of one end of the feed rack
and a rear view of the dog wheel, its shaft and ratchet wheel; and
Figure 4 is. a vertical section on an enlarged scale of a portion of the frame
carrying the dog wheel and its operating mechanism.
In said drawings A represents the frame of the type writing machine, and B one
of the guide rods for the paper-carriage C. The latter is provided with wheels c
to travel upon the guide rod and is hinged as usual to said guide rod. D is a
hinged duplex feed rack having arms d³ adjacent to its ends, that are perforated to
receive the guide and hinge rod B. The carriage is connected as usual preferably
by means of a strap, with a spring fusee or drum E by which the carriage is
advanced in the direction of the arrow.
To cause the carriage and duplex rack to advance only the distance of one tooth
at a time, under the influence of its operating spring, as soon as a finger key or a
space key has been depressed and released, a rotatable dog or dog wheel F is
mounted upon a shaft G, retained in bearings a and a secured to or formed integral
with the frame A. To allow for wear of the shaft in its bearings one end of said
shaft is preferably conical and received in a corresponding recess in the bearing a,
while the opposite end of the shaft receives the conical point of a screw passing
through the bearing a². The dog wheel, arranged to rotate at right angles to the
travel of the rack, is provided with a series of teeth fat a sufficient distance apart
so that the spaces between them will permit the passage of the teeth d, pendent
in two parallel rows from the bottom of the rack bar, the teeth of one row being
arranged to alternate with those in the other row, so that at each release of the
dog wheel the rack and its carriage will be allowed to advance one half the distance
between two of the teeth in the same row.
To cause the teeth of the dog wheel to engage properly with the outer row of
cogs on the rack after the operator has slid the carriage back to print a new line,
one end of the rack is provided with a small plate g arranged as a plow share, with
one end secured to the inner side of the rack and the other end divergent therefrom
and also slightly inclined downward, to plow its way or move into one of the
spaces of the dog wheel F and set one of its teeth opposite the outer row of
teeth on the rack and arrest the latter until released by the operator striking one
of the finger keys. By this construction a uniform margin at the left hand side of
the paper is secured.

page_text: arm h
To rotate the shaft G there is mounted thereon a ratchet wheel g³, and the latter
is rotated by means of a pawl H, one end of which is retained in engagement with
said ratchet wheel and the opposite end is connected with the transverse
universal bark that is controlled by the space key lever or by either one of the
type key levers K, the connection being made preferably through an
attached to a rod h2 pivoted to the frame A and a connecting rod h³, one end of
said connecting rod being pivoted to the universal bar k, while its opposite end
is pivoted to the arm . The lower end of the pawl H is also pivoted to the
arm h, while its upper end is retained in engagement with the ratchet wheel by
means of a spring i, which is preferably a flat spring having one end pressing
against the back of the pawl while its opposite end is secured to the frame A.
The pawl H, as arranged in connection with the spring, acts not only as a propeller
for the ratchet wheel, but also as a brake therefor, as the, friction of the pawl
against the ratchet wheel prevents it from acquiring a momentum under the
impulse of the pawl beyond the place where it has advanced it. A retaining
pawl is also made to engage with the ratchet wheel to prevent any back motion
of the latter while the pawl H is being retracted by the operator pressing upon
the space key or the key levers. When the latter are released, a spring, as the
spring K pressing under the universal bar k, again advances the pawl H, its
ratchet wheel and the dog wheel F, and permits the rack to advance the space
between its staggered or alternated teeth.
As said dog wheel revolves only in one direction the teeth on said wheel are not
liable to get out of order by ordinary wear; and as there are many teeth the wear
is vastly less than in machines having a single oscillating dog.
Having now particularly described and ascertained the nature of this said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
1. In a type writing machine, the combination with a power-driven carriage, of a
duplex rack, having alternately arranged teeth, connected to travel with said
carriage, and a single rotatory toothed-escapement or dog wheel arranged to turn
at right angles to the path of travel of the duplex rack, as and for the purpose
described.
2. In a type writing machine, the combination with a power-driven carriage, of
a hinged duplex rack, having alternately arranged teeth, a single dog wheel
arranged to rotate at right angles to the path of travel of the duplex rack,
and a pawl and ratchet wheel for rotating the dog wheel, as and for the purpose
described.
I
3. In a type writing machine, the combination with a power-driven carriage, of a
duplex rack hinged thereto and having alternately arranged teeth, a single dog
wheel arranged to rotate at right angles to the path of travel of the rack, the teeth
of the rack and the dog wheel being adapted to engage directly with one another,
a ratchet wheel, a driving pawl, a spring-actuated rocker-arm, and means for
moving the same, as and for the purpose described.
4. In a type writing machine, the combination with a power-driven carriage, of a
rack-bar having two sets of teeth arranged alternately, and a wheel or disc having
a single row or set of teeth, as described.
5. In a type writing machine, the combination of a paper-carriage and its rack, a
revolving dog wheel having teeth to engage with the teeth of said rack, and a
plate 9 carried by said rack and divergent therefrom, substantially as and for the
purpose described.
Dated this 19th day of February 1894
the
FELL & WILDING,
Agents for the Applicant.