Improvements in Typewriting Machines.
Year: 1898

page_text: Date of Application, 5th Dec., 1898-Accepted, 18th Feb., 1899
COMPLETE SPECIFICATION.
Improvements in Typewriting Machines.
I, CHARLES THOMAS POWERS, of Albert Street, Brisbane, in the Colony of
Queensland, Gun and Rifle Maker, do hereby declare the nature of this invention,
and in what manner the same is to be performed, to be particularly described
in and by the following statement:-
My invention relates to certain new and useful improvements in typewriting
machines of that class in which the letters and other characters are on a revolv-
ing wheel or cylinder; and, although applicable to several forms of typewriting
machines, is more especially designed as an improvement on the "Blickensder-
fer" machine, described in the Specification of Patent No. 7048%.
The object of my invention is to improve the locking of the type wheel so that
only the desired letter or character can be printed, and I attain this end by
means of one stop so designed that it is always in the same relative position with
the teeth of the stop wheel until brought into action to lock. In carrying out
my invention, I do away with the following parts.
Sprocket wheel; sprocket wheel stop plate, and two screws; snail; snail shield;
front stop, plate, and two rivets; front stop spring: front stop spring stud;
front stop adjustment screw and nut; back stop bail; back stop bail plate and
two screws; back stop bail spring; back stop spring stud; back stop adjustment
screw and nut; two back stop holding plates and four screws; main action
spring; main action spring stud or main action spring tension crank and screw.
In the place of the parts removed, I substitute a stop lock wheel; a new stop
and stop spring; a stop guide; a centre sector cam; a cam lever and screw; a
main action spring and stud.
In order, however, that my invention may be clearly understood, I will now
describe it, reference being made to the accompanying drawings, in which,
Figure 1 shows a part side sectional elevation of a type writing machine
("Blickensderfer" in this case).
Figure 2 is a part front elevation of same.
Figures 3 and 4 are details showing the movement of the main action.
Figure 5 is a perspective view of the centre sector cam.
Figure 6 is a perspective view of the stop piece.
Figure 7 is a perspective view of the cam lever.
Figure 8 is a perspective view of the sleeve which also has formed on it the
stop guide, and carries the spring retarder.
፡
Figure 9 is a part side sectional elevation of a machine having the same stops.
as illustrated in the other views but operated by a modification of the mechanism.
Figure 10 is a modification of the pitman head shown in Figure 9.
In lieu of the sprocket wheel, snail and shield, adopted on the Blickens-
derfer," I have devised a stop lock wheel K having slots to correspond with each
vertical row of letters and characters. This stop lock wheel K has at the front
a round nosed tooth K' and at the back a flat tooth K2, while between these on
either side are right and left handed teeth K+ splayed as shown in the plans.

page_text: The front tooth K' permits of the wheel passing the stop H in either direction,
while the back tooth K prevents the wheel being over carried by momentum.
This stop lock wheel K is secured to the operating pinion by the nut K³.
The stop H is formed as shown in. Figure 6 and is carried on the main action
shaft B, having an oval hole to permit of slight travel. On the main action
shaft B (which is provided with an adjustable tension spring C) at the left side
of the stop and connected thereto by the spring H2, is placed the centre sector
cam F; between the faces F1 and F2 of this cam F and the underside of the
flange H operates the lever G articulated to the top frame A.
On the sleeve J is secured or formed the stop guide
retarder Ja
The operation of this stop is as follows:-
and the stop lock wheel
The normal relative position of the various parts are shown in Figure 1. On
a key being struck, the typewheel is revolved until the key lever depresses the
long bail when the teeth of the long bail sector M, engage the teeth of the centre
sector cam F, causing the cam face F to lift, by means of the face G2, on the cam
lever G; this lever G rising causes its face G¹ to prise up the stop H by the
flange Hand so arrests the stop lock wheel K, and, on further motion, the stop
enters the slot.
The relative position of the parts are then as shown in Figure 4.
While the stop lock wheel K has been revolving the stop H has remained in
the same relative position to all the passing teeth, and has the same travel to
lock all letters. Figure 3 shows the relative position of the parts after the stop
lock wheel has been revolved, and it will be seen that, as the stop H is carried
in the guide J¹, on the sleeve J it is also carried forward with the stop lock
wheel K, the flange H of the stop H riding on the upper surface G¹ of the cam
lever G. At the same time the tension of spring H2, which keeps the stop H in
proper relation with the centre sector cam F, is relaxed.
In the modification shown in Figure 9 the stop H is actuated by means of a
pitman N carrying a small stud or roller working on the underside of the
stop H this pitman N is articulated to a pin N on the long bail; by means
of a bell crank N¹. This bell crank N¹ is provided with a slot, having the upper
end curved as shown, in which slides the pin N spring H2 is fitted as shown
and brings the stop H back into its normal position.
The action of this modification is as follows:-
On the long bail being pressed down, the pin N first acts on the upper curved
end of the slot in the bell crank N¹ pressing the arm of the bell crank out, thereby
pushing the stop H up, by means of the pitman N2, and locking the stop lock
wheel K. Owing to the arrangement of the slot in the bell crank N¹, any
further travel of the long bail does not affect the stop H.
In the modification shown in Figure 10, the oval hole in the bottom of the
stop H is provided with a projecting rib H³ on which works the circular hole
in the top of the pitman N2. The action of this will be readily understood.
In Figure 8 a stop lock wheel retarder J2 is shown, the curved ends of which
lightly pressing against the inner side of the teeth in the stop lock wheel K
prevents any back lash that may occur when the parts begin to wear.
1
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is: -
1. In typewriting machines, the combination with the type wheel and type
wheel shaft, of means for locking said type wheel, consisting of the stop lock
wheel K, having slots, and teeth K1, K2, K, as herein described and as illustrated
in the accompanying drawings, with reference to Figures 1, 2, 3, 4, 6, and 9.
2. In typewriting machines, the combination with the type wheel and type
wheel shaft, of means for locking said type wheel, consisting of the stop lock

page_text: wheel K, having slots, and teeth K, K, K, locked at certain times by stop H,
having flange H, and stop spring H², as herein described and as illustrated in
accompanying drawings, with reference to Figures 1, 2, 3, 4, and 6.
3. In typewriting machines, the combination with the type wheel and type
wheel shaft, of means for locking said type wheel, consisting of the stop lock
wheel K, having slots, and teeth K, K², K, locked at certain times by stop H,
having flange H, and stop spring H2, working in stop guide J¹, as herein
described and as illustrated in accompanying drawings, with reference to
Figures 1, 2, 3, 4, 6, and 8.
4. In typewriting machines, the combination with the type wheel, type wheel
shaft, type key levers, long bail, and long bail sector M, of means for locking said
type wheel, consisting of the stop lock wheel K, having slots, and teeth K, K²,
K, locked at certain times by stop H, having flange H, and stop spring H³,
working in stop guide J, operated by centre sector cam F having faces F1, F2,
as herein described and as illustrated in the accompanying drawings, with
reference to Figures 1, 2, 3, 4, 5, 6, and 8.
2
5. In typewriting machines, the combination with the type wheel, type wheel
shaft, type-key levers, long bail, and long bail sector M, of means for locking
said type wheel, consisting of the stop lock wheel K, having slots and teeth K',
Ka, K, locked at certain times by stop H, having flange H, and stop spring H²,
working in stop guide J, and operated by centre sector cam F having faces F',
3, in conjunction with cam lever G having faces G¹, G2, as herein described
and as illustrated in accompanying drawings with reference to Figures 1, 2, 3,
4, 5, 6, 7, and 8.
6. In typewriting machines, in conjunction with the type wheel and type
wheel shaft, of means for locking said type wheel, consisting of the stop lock
wheel Khaving slots, and teeth K', K2, K4, locked at certain times by stop H,
having stop spring H³, as herein described and as illustrated in the accompanying
drawings, with reference to Figure 9.
7. In typewriting machines, the combination with the type wheel, type wheel
shaft, type-key levers, and long bail, of means for locking said type wheel,
consisting of the stop lock wheel K, having slots, and teeth K¹, K², K+, locked
at certain times by stop H, having stop spring H2, operated by pitman N³, in
conjunction with pin N, and bell crank N¹, as herein described and as illustrated
in the accompanying drawings, with reference to Figure 9.
8. In typewriting machines, the combination with the type wheel, type wheel
shaft, type-key levers, and long bail, of means for locking said type wheel,
consisting of the stop lock_wheel K, having slots, and teeth K, K², K', locked
at certain times by stops H, operated by pitman №2, as herein described and
illustrated in Figure 10, in conjunction with stop spring H³, pin N and bell
crank N¹, as herein described and as illustrated in Figure 9.
Talth L
2 D
1
1000
ABEL & IMRAY,
Agents for the Applicant.