Improvements in Typewriting Machines.
Year: 1897

page_text: Improvements in Typewriting Machines.
I, OTTO FERDINAND MAYER of 4 Charlottenstrasse, Berlin in the Empire of
Germany, Technologist, 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 has for its object an improvement in typewriting machines of the
kind described in patent No. 10,241/96 by which the type wheel after a suitable
adjustment strikes the desired type against the paper roller or rather the stretched
paper in order thus to obtain an impression as clear and legible as possible on the
paper.
The typewheel f¹ is in the present case carried by a frame 8 which is revolubly
or pivotally suspended at the point t to the machine frame. The downward movement
of each key m is utilised for revolving the typewheel on its axis by means of a double
armed lever n n' and gearing 9 g so far that the desired type is adjusted for the
impression, whilst, by the further downward movement of the key for the purpose
of impressing the desired type, the type wheel carrier describes an oscillating movement
on its axis.
An example of the arrangement by means of which this oscillating or reciprocating
movement of the type wheel carrier 8 is obtained and is rendered as energetic as
possible is shown in the accompanying drawing, in which all those parts which
are not necessary for the comprehension of the invention are omitted:
Figure 1 is a plan view;
Figure 2 is a view from beneath;
Figure 3 is a longitudinal section.
The arrangement and mode of working of this device is essentially as follows:-
After the adjustment of the type wheel fl has first taken place in the ordinary
manner by the downward movement of the depressed key lever m, the key lever on
its further downward movement presses on the frame and thereby produces the
rotation of a spindle b. A spring c is mounted on the spindle b. the end of which
spring in consequence of the rotary motion of the spindle b travels from below on to a
projection d on the lower end of the type wheel carrrier 8 and is thereby stretched.
A second projection e on the type carrier & prevents however the rotation of the
latter on its axis t by resting against the projection o¹ of a lever o which is pivotally
mounted on the under side of the machine frame at p and stands under the action of
spring p which constantly tends to retain it in the end position in which it rests
with its projection o¹ in front of the projection e, and thus prevents the rotation of the
type wheel carrier 8.
"
A cam q mounted on the spindle b rests in such a way against a cam-shaped edge
of the lever o that on the spindle b rotating by the movement of the key, it presses
back gradually the lever o against the action of the spring p¹ in such a way that the
projection o' at the end of the movement of the keys releases the projection e of the
ype wheel carrier 8 as shown in the view from beneath, Figure 2.

page_text: The spring c, stretched in the meantime to its maximum, now with its entire force
throws the projection d of the type wheel carrier upwards and thus causes the
rotation of the latter on its axis p and thereby an extremely powerful stroke of the
type wheel f¹ against the paper cylinder k.
Owing to the spring c acting with its full energy the adjusted type makes the
impression with such force that a large number of clear simultaneous impressions or
copies may be easily obtained.
If the depressed key be then released, the type wheel carrier 8, and with it the
remaining parts, are again returned by a spring to their normal initial position, the
said spring being for this purpose mounted below the machine frame and pressing
from above on the projection d
In order so prevent the type wheel f¹ from moving after the adjustment of the
desired type has taken place, which, tends to cause an inexact impression, a toothed
segment g¹, as shown in Figures 1 and 2, is provided at its ends with a row of small
teeth g2 in which spring pawls u can engage for the purpose of locking the apparatus.
These pawls u are mounted on the spindle bin such a way that, in the position of
the various parts, they do not lie in the plane of the toothed segment gl Only when
the toothed seginent has suitably revolved the depressed key, and the desired type of
repose of the type wheel is adjusted for the impression; do the pawls,
following the rotary. motion of the spindle b, come into the plane of the toothed
segment gin such a way that, according to the position of the latter, the one
or the other pawl u engages in its respective row of teeth g2 and thereby secures
the position of the type wheel until.the arrested type has produced the impression....
The spacing key.v may be operated, alone or by means of the keys 'm, by the
intermediary of the frame a.
The types are arranged one above the other in three rows on the type..wheel f¹, and
the keys xy.serve for allowing the type wheel to be raised on its axis fin such a way
that each set or row of type may be adjusted into the position for printing..
لي .....
* 1.
Having now particularly described and ascertained the nature of iny said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1. The improvement in typewriting machines with rotary type-wheel of the kind
described in patent No. 10241/96, consisting in the type carrier (8). being revolúbly
arranged on a fixed spindle (t) and adapted to be retained on the downward movement
of the depressed key by means of an adjustable stop device (o o¹) until a spring (c)
has reached its full pressure, which spring then with its full energy swings the type
wheel carrier on its axis, and thus causes an energetic impression of the adjusted type,
substantially as described.
2. In the herein described typewriting machine with rotary type wheel, the
arrangement whereby the gearing (9 g¹) serving for adjusting the type-wheel (1) is
secured in its position after the adjustment has taken place, by a' spring pawl ()
operated by the movement of the key engaging in suitable ratchet, teeth (92) of a
toothed segment (g) until the impression of the adjusted type has taken place;
substantially as described.
.. 1