Improvements in or relating to Driving Mechanism for Record Strips.
Year: 1899

page_text: Date of Application, 8th Nov., 1899
Complete Specification Left, 4th Aug., 1900-Accepted, 8th Sept., 1900
PROVISIONAL SPECIFICATION.
Improvements in or relating to Driving Mechanism for Record Strips.
We, THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY, LIMITED, of Carlyle
Road, Cambridge, and MOSES JOHN WAYNE, of Carlyle Road, Cambridge, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to driving mechanism for record strips and is primarily
applicable to instruments in which a continuous record of the movement of, say,
a pen, style, or a beam of light is made upon a strip of paper travelling at a
constant speed.
In mechanism according to this invention the strip is drawn along by a roller
having upon its periphery one or more rows of small projections or points spaced
at equal distances.from each other. This driving roller is rotated, say, by clock-
work, and operates in conjunction with another roller which is provided with
one or more grooves or recesses opposite to the projections upon the driving
roller. As the driving roller rotates the projections or points upon it enter the
strip which is consequently drawn along at a uniform rate, and as the projections
are equally spaced around the driving roller it follows that the distance between
the holes or impressions in the strip will correspond to a certain unit of time,
such unit depending upon the rate of rotation of the driving roller, and the
distance between the points. A time scale is thus automatically marked upon
the strip.
Before the strip reaches the driving roller it passes over a guide, which is
preferably in the form of a roller having at one end a fixed flange and at the
other end a movable one. The movable fange is controlled by a spiral or other
spring, so arranged that it tends to move the loose flange towards the fixed
one. This arrangement has the effect of pushing one edge of the strip against
the fixed flange and also allows for inequalities in its breadth. A plate is pre-
ferably arranged to press upon the strip as it passes over the guide roller in
order to keep it taut when drawn by the driving roller. In some cases the weight
of the plate is sufficient for this purpose, but a light spring or equivalent device
may be provided if desired.
It will be seen that when driving mechanism according to this invention is
used, there is no need to perforate the strip before placing it in the instru-
ment.
Dated this Sixth day of November 1899.

page_text: We, THE CAMBRIDGE SCIENTIFIC INSTRUMENT COMPANY, LIMITED, of Carlyle
Hoad, Cambridge, and MOSES JOHN WAYNE, of Carlyle Road, Cambridge, Engineer,
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 driving mechanism for record strips and is primarily
applicable to instruments in which a continuous record of the movement of, say,
a pen, style, or a beam of light is made upon a strip of paper travelling at a
constant speed.
In mechanism according to this invention the strip is drawn along by a roller
having upon its periphery one or more rows of small projections or points spaced
at equal distances from each other. This driving roller is rotated, say, by clock-
work, and operates in conjunction with another roller which is provided with
one or more grooves or recesses opposite to the projections upon the driving
roller. As the driving roller rotates the projections or points upon it enter the
strip which is consequently drawn along at a uniform rate, and as the projections
are equally spaced around the driving roller it follows that the distance between
the holes or impressions in the strip will correspond to a certain unit of time,
such unit depending upon the rate of rotation of the driving roller, and the
distance between the points. A time scale is thus automatically marked upon
the strip.
Before the strip reaches the driving roller it passes over a guide, which is
preferably in the form of a roller having at one end a fixed flange and at the
other end a movable one. The movable Hange is controlled by a spiral or other
spring, so arranged that it tends to move the loose flange towards the fixed
one. This arrangement has the effect of pushing one edge of the strip against
the fixed flange and also allows for inequalities in its breadth. A plate is pre-
ferably arranged to press upon the strip as it passes over the guide roller in
order to keep it taut when drawn by the driving roller. In some cases the weight
of the plate is sufficient for this purpose, but a light spring or equivalent device
may be provided if desired.
It will be seen that when driving mechanism according to this invention is
used, there is no need to perforate the strip before placing it in the instru-
ment.
In the accompanying drawings which illustrate one method of applying this
invention:-
Figure 1 is a front elevation of the mechanism, the strip not being shown in
position,
Figure 2 is an inverted plan of the same, with the trough and strip removed,
Figure 3 is an end elevation of the same having a portion removed and show-
ing the paper strip in position, and
Figure 4 is an enlarged view of a portion of the roller showing the movable
flange.
Like letters indicate like parts throughout the drawings.
A frame A comprising brackets A¹ A³ connected by tie rods As and a front

page_text: plate A supports the mechanism hereinafter described. Pivotted at A³ in the
frame A is a driving roller B having upon its periphery a series of small equally
spaced projections or points B¹ arranged in a row disposed at right angles to the
axis of the roller, the surface of which is roughened as at B for a short distance
on either side of the points B¹. Conveniently fixed on one end of the roller B
is a spur wheel B³ by means of which the roller is rotated at a uniform rate,
preferably by clockwork, in the direction indicated by the arrow in Figure 3.
Pivotted in the frame A at A is another frame C carrying in pivot bearings Cl
a roller D which presses against the driving roller B and has a groove D' formed
on its surface to receive the points B. Above these two rollers, but preferably
not connected thereto, is a guiding roller E pivotted at A' in the frame A and
having flanges E¹ E one of which E' is fixed to the roller E while the other F
is loose upon a reduced portion E thereof. On this reduced portion of the
roller E is a collar E which acts as a stop for a spiral spring , the other end
of which presses against the loose flange E³ and tends to move it towards the
fixed flange E¹. A plate F, one end of which rests on the guiding roller E, has
the other end mounted on a rod F¹ pivotted at A8 in the frame A. A paper
strip G on which the record is made is placed beneath the plate F, over the
guide roller E and between the two rollers B and D, as shown in Figure 3 of
the accompanying drawings. A trough H suitably suspended from the
brackets A As may be provided to hold a roll G¹ of the strip G preferably
wound around a rod pivotted at H¹ in the ends of the trough H.
The operation of the mechanism is as follows:—
On the roller B being rotated as herein before described, the equally spaced
points B are successively forced through the strip G by the pressure of the
roller D, this pressure being due to the combined weight of the roller D and
pivotted frame C, consequently the strip G is drawn forward at a uniform rate,
the roughened surfaces B assisting in this operation. The strip G is kept tunt
by the action of the plate F the weight of which presses it on to the guiding
roller E and acts as a brake. One edge of the strip G is held in engagement
with the fixed flange E¹ of the roller E by the pressure of the spring E acting
through the loose flange E on to the other edge, this arrangement also allows
for any inequalities in the breadth of the strip.
As will easily be seen a time scale may be automatically marked upon the
strip G by means of the perforations made by the equally spaced points B¹ on
the roller B which travels at a uniform rate.
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. The combination with record strip driving mechanism of a perforating
device for the purposes described.
2. In record strip driving mechanism the combination with one of the driving
rollers of a series of equally spaced projections which perforate the record strip
for the purpose described.
3. In record strip driving mechanism marking a time scale upon the strip by
perforating it as it passes through the mechanism.
4. In record strip driving mechanism a roller having a fixed flange and a spring
controlled movable flange such as E' and E respectively substantially as and
for the purpose described.
5. In record strip driving mechanism the combination of a positively driven
feeding roller having perforating teeth upon it a swinging guide roller grooved
to receive the teeth of the driving roller and a platen roller having a fixed flange
at one end and a spring controlled movable flange at the other end the whole
operating substantially as and for the purpose described and illustrated in the
accompanying drawings.

page_text: 6. The complete record strip driving mechanism substantially as and for the
purpose described or illustrated in the accompanying drawings.
Dated this 3rd day of August 1900.
THE CAMBRIDGE SCIENTIFIC INSTRUMENT
COMPANY, LIMITED.
HORACE DARWIN,
H. F. NEWALL,
Directors,
ROBERT S. WHIPPLE,
Secretary.
MOSES JOHN WAYNE;
Boult, Wade & Kilburn,
Agents for the Applicants.