Improvements in or relating to Type-writers.
Year: 1890

page_text: Date of Application, 10th July, 1890
Complete Specification Left, 10th Apr., 1891-Accepted, 13th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in or relating to Type-writers.
A communication from CHARLES SPIRO, of the City, County, and State of
New York, United States of America, Gentleman.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., do hereby declare the nature of this invention to be as follows:-
This invention relates to the simplification of parts of the mechanism connected
with the spools, escapement, and ribbon frame.
I prefer to retain the spool upon the pin or spindle which carries it in the
following manner :-
I provide the spindle with a very small head and split the spindle so as to cause
the two parts to spring from each other slightly so that when the spool is pushed
on to the spindle the two parts are compressed and the head is allowed to pass
through the hole in the spool but the spool cannot be withdrawn without sufficient
force to compress the two parts of the spindle. The spool is connected with the
ratchet wheel which drives it preferably by means of a pin fixed in one part and
entering a hole or recess in the other a helical spring being compressed between a
fixed portion of the apparatus and the ratchet wheel thus keeping the spool pressed
against the head of the spindle.
To overcome the difficulty generally experienced in fastening the ribbon upon
the spool I prefer to employ a circular shaped spring clip of somewhat smaller
diameter than the centre of the spool upon which the ribbon is to be wound and
adapted to embrace more than half of such centre. In using this clip the end of
the ribbon is placed upon the centre of the spool and the clip pushed over both
ribbon and spool centre the ends of the spring opening to allow it to pass and then
gripping the ribbon sufficiently tightly.
The difficulty previously experienced with the dogs of the escapement mechanism
has been that one of the dogs, technically called the fixed dog, if it was screwed
tightly against the frame which carries it would not move sufficiently freely whereas
if it were not screwed sufficiently tightly against the frame it was apt to shake
laterally and thus fail in properly performing its function. This difficulty I over-
come by forming upon the dog two cup-shaped recesses with the pin hole connecting
the two; the head of the screw and the nut are both spherical to suit the cups and
the result is that the screw being inserted the nut is placed upon it and may be
screwed up to the proper tension, then the screw is screwed into the dog frame
tightly thus locking the screw in that frame against the nut which is already upon
it. By this means any required amount of freedom may be afforded to the dog
without the objectionable lateral shake.
Dated this 10th day of July 1890.
W. P. THOMPSON & BOULT,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to Type-writers.
A communication from CHARLES SPIRO, of the City, County, and State of
New York, United States of America, Gentleman.
I, ALFRED JULIUS BOULT of 323 High Holborn, in the County of Middlesex,
M.I.M.E., 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 the simplification of parts of the mechanism connected
with the spools, escapement, and ribbon frame.
I prefer to retain the spool upon the pin or spindle which carries it in the
following manner :-
I provide the spindle with a very small head and split the spindle so as to cause
the two parts to spring from each other slightly so that when the spool is pushed
on to the spindle the two parts are compressed and the head is allowed to pass
through the hole in the spool but the spool cannot be withdrawn without sufficient
force to compress the two parts of the spindle. The spool is connected with the
ratchet wheel which drives it preferably by means of a pin fixed in one part and
entering a hole or recess in the other a helical spring being compressed between a
fixed portion of the apparatus and the ratchet wheel thus keeping the spool pressed
against the head of the spindle.
To overcome the difficulty generally experienced in fastening the ribbon upon
the spool I prefer to employ a circular shaped spring clip of somewhat smaller
diameter than the centre of the spool upon which the ribbon is to be wound and
adapted to embrace more than half of such centre. In using this clip the end of
the ribbon is placed upon the centre of the spool and the clip pushed over both
ribbon and spool centre the ends of the spring opening to allow it to pass and then
gripping the ribbon sufficiently tightly.
The difficulty previously experienced with the dogs of the escapement mechanism
has been that one of the dogs, technically called the fixed dog, if it was screwed
tightly against the frame which carries it would not move sufficiently freely whereas
if it were not screwed sufficiently tightly against the frame it was apt to shake
laterally and thus fail in properly performing its function. This difficulty I over-
come by forming upon the dog two cup-shaped recesses with the pin-hole connecting
the two; the head of the screw and the nut are both spherical to suit the cups and
the result is that the screw being inserted the nut is placed upon it and may be
screwed up to the proper tension, then the screw is screwed into the dog frame
tightly thus locking the screw in that frame against the nut which is already upon
it. By this means any required amount of freedom may be afforded to the dog
without the objectionable lateral shake.
In the accompanying drawings :-
Fig. 1 is a section of the spool with the spindle in full.
Fig. 2 is a perspective view of the clip for fastening the ribbon to the spool, and
Fig. 3 is a cross section of the spool-spindle showing the clip and ribbon in
position.
Fig. 4 is a perspective view of the escapement mechanism and dogs, and
Fig. 5 is a vertical section of the same.
Figs. 6 and 7 are details of portions of Figure 5.
All these figures are drawn to the scale of about double the usual size.
Like letters indicate like parts in the respective figures of the drawings.
Turning first to Fig. 1, A is the spool, B the ratchet wheel which drives it,
C the spindle which carries the spool, and D the spiral spring placed upon a portion
of the spindle C shown in the drawing reduced in diameter, and slightly compressed
between the ratchet wheel B and a portion of the framing E; it will be seen that
the spindle C is provided with a head C₁ slightly larger in diameter than the

page_text: cylindrical portion of the spindle upon which the spool A is carried while a saw-
cut or split C extends down the cylindrical portion of the spindle as shown. The
centre of the spool A being bored to fit the cylindrical portion of the spindle, it is
evident that to put the spool onto the spindle or remove it therefrom the head C¹
must be compressed so as to allow the spool to pass.
The spindle C is shown reduced at F so as to form a shoulder G for the ratchet
wheel B to abut against and against which it is pressed by the spring D. The
spindle C is a fixture being, as indicated in the drawing, screwed into the
framing E while the ratchet wheel is driven round upon it against the shoulder G
and motion is communicated to the spool by means of the pin H which is a fixture
in the spool and passes through a hole in the ratchet wheel B or vice versa.
The clip I shown in Figs. 2 and 3 is merely a flat spring curved to embrace
the centre A' of the spool A and to grip between itself and the said centre A¹
the end of the ribbon J as clearly shown in Fig. 3. The clip I can be removed
when required for the application of a new ribbon.
The means employed for securing the "fixed" dog will be best understood by
reference to Figs. 5, 6 and 7, in the first of which figures the "fixed" dog K is
shown in section, as also is that portion of the framing to which it is secured.
The dog has a hole K' through which passes the screwed pin or bolt L which
screws into the framing M. Upon the screwed portion of the pin L is a nut N
having a flat, square or hexagonal portion and upon this a partly spherical
portion N¹ and bored and tapped to fit upon the pin L. The hole K in the
dog K is recessed with a spherically shaped countersink to accommodate the
projecting portion of the nut as is indicated in the drawings, while upon
the opposite side of the dog the hole K' is also spherically countersunk to receive
the correspondingly shaped portion L' of the pin L. By this means the dog can
be securely held without undue shake and without binding while the pin Lis
firmly secured in the framing both by being screwed therein and also by the
locking effect of the nut N which may be firmly screwed up against the framing M.
Between the head L' of the pin L and the dog K is coiled the spring O which
controls the movement of the dog.
Having now particularly described and ascertained the nature of the said
invention, as communicated to me by my foreign correspondent, and in what
manner the same is to be performed, I declare that what I claim is :-
:-
1. The combination with a type-writer spool of a split spindle such as C having
a slightly projecting head such as C₁ substantially as described and illustrated in
Figure 1 of the accompanying drawings.
2. The combination with a type-writer spool of a split pin such as C having
a shoulder such as G and spring D whereby the spool-driving-ratchet-wheel is
held in proper relative position to the spool and lateral play prevented sub-
stantially as described and illustrated in Figure 1 of the accompanying drawings.
3. In a type-writer spool the combination with the spool and the ribbon of a
spring clip such as I substantially as described and illustrated in Figures 2 and 3
of the accompanying drawings.
4. In a type-writer mounting the dogs upon a pin with cup and ball joints
substantially as described and illustrated in Figures 5, 6 and 7 of the accompanying
drawings.
5. In a type-writer the combination with an escapement dog such as K having
a pin-hole spherically recessed at both ends of a pin such as L having a spherically
curved neck and nut such as L' and N' substantially as described and illustrated
in Figures 5, 6 and 7 of the accompanying drawings.
Dated this 10th day of April 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.