Improvements in Type-writers.
Year: 1891

page_text: Date of Application, 10th Nov., 1891-Accepted, 12th Dec., 1891
COMPLETE SPECIFICATION.
Improvements in Type-writers.
We LOUIS HENRY VAUGHAN of 29 Campbell Road Finsbury Park London and
WILLIAM ERNEST EVANS of 507 Caledonian Road Upper Holloway London
Gentleman 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:-
Our invention has for its object certain improvements whereby manifold type
writing may be carried out in a more uniform manner than heretofore while
preserving the correct alignment of types without causing any damage to the
machine.
Heretofore when a number of paper sheets were inserted between the fixed
cylinder and the movable feed roll, the latter had to recede to make way for these
sheets which increased the diameter of the lower half of the cylinder a quantity
equal to the thickness of the paper inserted, thus lowering the printing point and
throwing the writing out of alignment. Moreover it frequently occurred that the
carriage frame becoming deformed had to be restored to its proper shape by
means of a wrench applied at one or both ends of the said frame, thus throwing the
various parts thereof out of adjustment.
Now our invention has for its object to remedy these defects its main features
being to render the cylinder movable and the feed roll rigid, thus reversing the
above named conditions. It is therefore the cylinder which yields now to the
paper sheets inserted, the printing point remaining in its normal position whatever
may be the number of sheets used.
In this arrangement the scale which was usually flat is curved around the feed
roll so as to cover the same and prevent its being soiled by the inking ribbon.
We arrange moreover a duplicate scale at the foot of the guide over which the
paper is passed between the cylinder and the feed roll whereby the paper may be
forthwith placed in the position required without having to raise the carriage for
the purpose of consulting the first mentioned scale.
I provide furthermore at each end of the cylinder a steel spring bearing upon the
shaft of the cylinder so as to hold it down at each end upon its hearings two indenta-
tions being formed at each extremity of such shaft, one of which is lower than the
other. This arrangement has for its object to prevent an alteration in the true
shape of the cylinder, when narrow strips of paper are printed on one end only of
the same, a weaker pressure being in such cases exerted on the end of the cylinder
not covered with paper than on that upon which the paper strip is wound. These
springs are pivotted at one end and can be moved aside so that the cylinder may be
readily removed whenever required and replaced by another the ratchet wheel
spring being mounted for this purpose upon the shaft on the right hand end of the
cylinder. Such a removal could not take place in type-writers such as heretofore
constructed without having to call in the aid of a skilled mechanic.
In order to accurately adjust the cylinder we arrange under each feed roll
bearing a small block against which presses two regulating screws passing through
these bearings.
In the accompanying drawings
Fig. 1 is a plan of the carriage frame Fig. 2 being an end view thereof.
Fig. 3 is a longitudinal section on line xx of Fig. 1 showing the cylinder in
elevation.
Figs. 4 and 5 are respectively a side view and a plan of one end of the cylinder.
Fig. 6 is a detail.
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page_text: underside of which is flat while its upper convex surface is furnished with two
indentations i and the former of which is higher than the latter thus forming two
steps. Each extension is inserted between the two arms of the bearings e. The
springs c c which are furnished with a finger piece are pivotted to the flat part
of the paper guide g at each end of the carriage, the flat part being provided with
a duplicate scale s enabling the paper sheet to be placed in position straight away
without having to raise the carriage frame in order to look at the other scale s¹,
which is curved according to this invention over the feed roll d for the purpose
hereinbefore mentioned. These two springs c c bear both upon the corresponding
indentations or steps or when the paper sheet is placed centrally around the
roller, but should a paper strip be wound upon the right hand end of the cylinder for
instance, the pressure would be relieved on the left hand end by shifting the spring c
upon the outer indentation the spring c¹ remaining upon the inner indentations i.
The ratchet spring his mounted upon the right hand end of the shaft a¹ so that the
cylinder can be entirely removed by merely pushing the springs c c aside. are
two small blocks arranged above each bearing k of the feed roll as shown in Fig. 2
against which bear the ends of the two screws / passing through the said bearings.
By returning these screws on or off, the cylinder can be accurately adjusted in
position.
Fig. 6 shews the manner in which the bell is struck according to my improve-
ments. We arrange a screw n passing through a slot formed in the end of the rack
bar m and fixed in a foot o which trips the hooked end of the hammer p when the
carriage has been moved far enough to the left hand side.
Our invention is applicable to that class of type writers in which the type bars
are arranged in a circular row such as the "Remington " the "Caligraph” and
the like.
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) In type writers in which the type bars are arranged in a circular row, the
mounting of the cylinder or platen in such a manner as to be resilient and readily
removable while the feed roll is rendered rigid substantially as herein described and
shewn and for the purpose set forth.
(2) In type writers in which the type bars are arranged in a circular row the
mounting of the cylinder shaft in such a manner that the pressure at each end
thereof may be relieved substantially as herein described and shown, and for the
purpose set forth.
(3) In type writers in which the type bars are arranged in a circular row the
mechanism for adjusting the cylinder substantially as herein described and shewn.
Dated this 9th day of November 1891.
G. H. RAYNER,
37, Chancery Lane, W.C., Agent for the Applicants.