Improvements in and connected with Type-writers.
Year: 1898

page_text: Date of Application, 14th May, 1898-Accepted, 20th Aug., 1898
.COMPLETE SPECIFICATION.
Improvements in and connected with Type-writers.
We, WILLIAM S. CRAIG, Engineer, and CHARLES CHASE WHITACRE, Merchant,
both of 37, Walbrook, E.C., in the County of London, 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 improvements in and connected with typewriters and
has reference more particularly to an arrangement whereby the paper roller can
le adjusted longitudinally with very great accuracy in or relatively to its carriage
or frame to bring any particular point, say for example an erased letter, into the
exact position for printing.
According to the said invention whilst the roller is provided with the ordinary
knobs or heads for rotating it, one end of its spindle is mounted in an adjustable
bearing or sleeve which bearing forms the essential part of the adjusting device,
and is provided with means for imparting to it, and from it to the roller, the
requisite fine degree of movement.
For the purpose of giving the required adjustment, the bearing may for
example be screw-threaded and work in a fixed nut or block on the roller carriage,
or a wedge-like action may be adopted instead of a screw-motion.
In order that the invention may be clearly understood I will proceed to describe
the same fully by aid of the accompanying drawings in which:
-
Figure 1 is a diagrammatic plan showing the naper roller and the carriage pro-
vided with a screw threaded adjusting device.
Figure 2 is an enlarged view of the said device partly in section.
Figure 3 is a plan partly in horizontal section of a device in which a wedging
action is employed.
Figure 4 is a side elevation and
Figure 5 an end view of this latter device.
Referring more particularly to Figures 1 and 2:
A is the paper roller, B is its carriage and C C are the ordinary knobs or heads for
rotating the roller.
a is the adjustable bearing which as stated, is in this case screw threaded and
has a head 6 for rotating it.
The said bearing is free to turn relatively to the spindle B¹ of the roller, so
that its rotation does not impart any rotary motion to the latter.
c is the nut or block in which the bearing a is mounted, and which is secured
to the end of the roller carriage.
It will be seen that the bearing a forms an accurate fit between the roller A
and the adjacent knob C, as any looseness or play at this part would interfere
with the adjustment. At the opposite end of the carriage however the spindle of
the roller can slide through its bearing.
By the arrangement just described it will be seen that the position of the roller
in the carriage can be adjusted longitudinally simply by turning the head b of
the bearing a. The extent of such motion is of course only small, being only

page_text: such as required to bring any particular point into exact register, after it has
been adjusted as near as possible by the movement of the carriage.
Referring now to the arrangement shown in Figures 3, 4 and 5 the screw-
threaded block a is dispensed with and a wedging block a¹ having oppositely
inclined conical wedging surfaces as a³ is secured to the spindle B₁ of the paper
roller, being for example formed integrally with one of the knobs or heads C.
The wedging action is effected by means of a lever d pivoted at d¹ and formed
with a circular expansion or ring sufficiently large to easily clear the block a¹
which it surrounds. On the ring of the lever are fitted two wedging pins e
which are arranged on opposite sides thereof, one towards the left hand and the
other towards the right-hand edge of the ring, so that while one serves to act on
the surface a when the lever d is moved in one direction, the other acts on the
surface a when it is moved in the reverse direction. It will be obvious that in
either case the spindle B₁ will be moved in a longitudinal direction.
The said spindle is in this arrangement free to move to and fro in its bearings
under the wedging action, and thus the movements of the spindle do not affect
the roller carriage but only serve to give the fine adjustment required.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
1. A type-writer having its paper roller provided with means for adjusting it
longitudinally in its bearings for the purpose described.
2. A typewriter of the kind referred to in the previous claim having its paper
roller provided with an adjusting device constructed substantially as described
with reference to Figures 1 and 2 or Figures 3, 4 and 5 of the accompanying
drawings.
· זי.
141 1
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.