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Патент USA US2129776

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Sept. 13, 193&
E. B. D. MACKENZIE
2,129,776
ELECTROCHEMICAL RECORDER
'
Filed Nov. 29, 1935
FIG.2.
2 Sheets-Sheet 2
'
InvenZZr
2,129,776
Patented Sept. 13, 1938 '
UNITED STATES. ‘PATENT OFFICE
v2429.176
ELnc'rnoonEMicAL nncormsn
Edward Briggs Drake Mackenzie, Portland, Eng
land, assignor to Henry Hughes & Son Limited,
London, England, a corporation of Great Brit
ain
Application November 29, 1935, Serial No. 52,264
~
In Great Britain December 3, 1934
3 Claims.
(Cl. 271—2.3)
This invention relates to recording apparatus
in which a permanent record is obtained by
while the other is free or geared to the driven
roller.
After passing through the feed rollers
means of electro-chemical action on suitable sen
the strip may be rewound on to a spool driven by
sitized paper, and in previous recording appara
any suitable means.
tus of this type a roll of dry paper has been sen
If desired, a heater maybe ?tted in any suit- 5
sitized by drawing it over a wick or other mois- ' able position to dry the strip before it is re
tening device which dips into a tank containing
a suitable solution such as potassium iodide and
starch, or the paper has been sensitized and
10 subsequently dried and then moistened, as re
quired, with water.
The paper moistened in this manner is drawn
over a writing table and a stylus is arranged to
traverse the paper and make electrical contact
through the sensitized paper to the writing table
when a record is to be produced on the paper.
In electro-chemical recorders of this type in
which the paper or other material has to pass
over moistening or sensitizing means, apart from
the'disadvantage of having to employ these nec
essary adjuncts, there is di?iculty in ensuring at
all times the required degree of moisture for
best working, as, if, the speed of travel of the
sensitive material is changed it may be neces
sary to readjust ‘the moistening means and such
adjustment may require considerable and pro
rolled._
In order to enable a record to be obtained
immediately after starting the recorder, one of
the feed rollers may be provided with a knob 10
for rotating it by hand and a ratchet feed or any
other type of free wheel drive, e. g., a coiled
spring, provided between the roller and its drive
to enable the roller to be turnedv more rapidly in
by hand than it is normally driven so that the 1
portion of the strip which is outside the casing
and may, therefore, have become dry before the
recorder is set in operation may be rapidly drawn
away and a fresh portion of the moist and sen
sitized strip withdrawn from the casing.
0
One suitable construction of a portion of an
electro-chemical recorder which comprises the
present invention is illustrated in the accom
panying drawings in which-
- I
Fig. 1 is a front elevation of a container for
the pie-sensitized and moistened strip and of
longed manipulation.
the means for drawing the recording strip be
Furthermore, the time required for the mois
tened and sensitized material to reach the stylus
track also makes it clii?cult to obtain records di
itself is not shown in this view.
rectly the apparatus is started.
In the present case the electro-chemical re
corder employs a recording strip in a pro-sen
sitized and pre-moistened condition, this pre
£4 sensitized and moistened strip being stored in
a suitable air-tight container until required for
use. The recording strip is sensitized and mois
tened by any suitable means, such as by draw.
ing the dry strip by means of rollers through
~10 a tank containing a solution, for example, of
potassium iodide and starch,- the requisite de
gree of moisture being controlled by adjustment
of ' the pressure between the rollers, such as by
the employment of suitable springs, and thesen
sitized strip in its moist condition is rolled on
to a-spool and stored in an air-tight container.
When required for use the prepared strip is re-'
moved from the storage container and mounted
in a casing, which is nearly air-tight and forms
part of the recording apparatus. The strip is
drawn from the spool through a slot in the cas
ing between a roller and a soft rubber pad which
tends to seal the slot and over a writing table by
means of feed rollers between which the, strip
is passed, one of the feed rollers being driven
neath the stylus; although the recording strip I
7
Fig. 2 is a sectional elevation through the air
tight container and the feed rollers and a device
for drying the moist recording strip.
The recorder is provided with a recording
stylus I which is attached to an arm 2 and this
arm may be moved by any suitable means (not
shown) so that the stylus is caused to traverse
the recording strip.
Preferably the stylus is
moved in a circular path by the arm 2 being
attached to a rotating carrier, but, if desired,
the stylus may be reciprocated across the paper
in a straight line or may even be stationary.
The recording strip which the stylus marks is
supported by a suitable writing table which in
this case is the 'cover 3 of ‘the container 4 for
the moist sensitized recording strip 5 which is
rolled on a spool 6 supported in brackets ‘I with
in the container 4 so thatthe spool can rotate ’
and these brackets ‘I are conveniently secured
to the cover 3 of the casing 4 which is made
practically air-tight except for a slot of small
dimensions through which the strip 5 passes out
of the casing as it is unwound from the spool
6. On leaving the casing 4 the strip 5 passes be
tween a roller 8 and a soft rubber pad 9 which
tends to seal the slot and the strip 5 then passes
2
2,129,77e
across the stylus track and between the feed roil
ers I0 and II, which are suitably pressed to
gether by a spring l2 to grip the strip.
The roller Ill is driven through a worm wheel
In
device or ratchet device which in this case is a
is swung open.
The stylus is connected to a recording circuit
while the cover 3 of the casing or the roller I
is also connected to the recording circuit so
that when an electric current is sent through
this recording circuit a chemical action takes
.place on the sensitized paper at the point where
.the stylus is in contact with it, resulting in a
coiled spring ll surrounding the shaft on which
mark being made on the paper strip thus forming
the roller I0 is supported so that if it is neces
sary to withdraw quickly a portion of the re
a permanent record. The distance of the mark
from the edge of the paper can be used as a
measure of the time interval between any fixed ll
l3 and worm ll which is driven through a ?exible
shaft l5 from the drive which rotates the stylus
in the case where the stylus ‘is moved in a cir
cular path. The two rollers are geared together
by gear wheels l6 and interposed between the
worm wheel l3 and the roller 10 is a free wheel
.a Li
their slots, and the continued outward move
ment of pin 23 causes pin 25 to move along the
short horizontal part of slot 28 so that the cover
cording strip when the recorder is started, owing
to the exposed portion of the strip having dried
before the apparatus is started, the roller “I can
be rotated in advance of its drive by means of a
hand knob ii, the spring I‘! unwinding suffi—
ciently to enable the rollers to be turned faster
than they are normally driven.
After passing between the feed rollers l0 and
II the strip 5 preferably passes between two elec
trical heating elements i 9 carried in a suitable
I: Ll holder and bracket 20 so that the 'moist strip
can be dried before being rolled up for storage
purposes.
'
The air-tight container 4 and the feed rollers
II and II are supported between side pieces 2!
(i1) projecting from a back plate 22 and the cover
3 of the casing is pivoted on the side pieces 21
in such a manner that the cover 3 can be dropped
downwardly before being swung open. For this
purpose the cover 3 has pivot pins 23 projecting
from its sides and movable in vertical slots 24
cut in the side pieces 2| and near the upper edge
of the cover 3 two more pins 25 project through
L-shaped slots 26 cut in the side pieces 2!. The
pins 25 have attached to them links 2'1 which
40 are pivoted at their other ends by pins 28 on
levers 23 pivoted on pins 30 ?xed to the side
pieces 2 I. These levers 29 are normally retained
datum and the instant of the passage oi the
electric current. In the case of echo sounding
recorders the distance of the mark from the
edge oi‘the paper, or a datum line i’rom which
the stylus commences its travel, forms a record
of the depth determined by the echo sounding
gear.
What I claim as my invention and desire to
secure by Letters Patent is:
1. In an electro-chemical recording device of
the type employing a paper strip and a traversing
stylus, a casing, a spool containing 9. rolled strip
oi’ presensitized paper within said casing, means
within said casing for supporting said spool to
enable it to rotate, a slot formed in the casing
to permit egress of the strip, feed rollers for
withdrawing the strip, a mechanical drive for
rotating one of the feed rollers, a yielding Iree~
wheel device interposed in the drive to said roller,
and a hand knob for rotating the roller in ad
vance of the drive to enable the paper strip to
be rapidly withdrawn.
2. In an electro-chemical recording device, a
casing containing a recording strip, feed rollers
for withdrawing the strip from the casing,-a
mechanical drive for rotating one, of the feed
rollers, said drive including a gear rotatable freely
in their upright positions by the springs 3|. ' on the shaft of said roller but coupled thereto by
When it is desired to open the casing, the upper
ends of the levers 29 are pulled outwardly and
the levers turn about their pivot pins 30 and the
links 21 pull the pins 26 downwards which causes
the cover 3 and the brackets ‘I attached to it
and the spool 8 to drop so that the pivot pins 23
then bear on the bottom of their slots 24. This
downward movement of the cover 3 also brings
the pins 25 to the horizontal part of the L-shaped
slots 26 and the pins 25 are therefore free to
move out of the side pieces 2| as the cover 3
swings outwardly and downwardly on its pivot
pins 23.
.
The link 21 and the part of lever 29 between
the pivots 28 and 30 form a toggle which, in the
position shown, is at its dead centre or rigid
position, with link 21 and the straight part of
lever 29 in alignment so that the toggle is rigid
and holds the cover firmly closed. When the
casing is to be opened the lever 29 is swung
clockwise (as viewed in Fig. 2) about its pivot 30
_ and the toggle therefore collapses and the out—
ward and downward movement of the pivot pin
28 causes the pins 23 and 25 to move down in
a free wheel device comprising a coiled spring
surrounding the shaft to transmit the mechanical
drive from the gear to the shaft, and a hand
knob secured to the end of said shaft for rotating
the roller in advance of the mechanical drive.
3. In a device 0! the character described, a
paper containing casing having a slot for with
drawal of paper therefrom, a pair of inter-geared
feed rollers to receive and advance paper from
said container, a drive gear, a driven gear mesh
ing with said drive gear and freely mounted
about one of said feed rollers, a coil spring se
cured to said driven gear and loosely wound about
a portion of said one feed roller in the direction
opposite to the direction of feed rotation thereof
whereby said spring tightens about and trans
mits the force of said driven gear to said one
roller in one direction only, and a knob on said
one roller to permit manual rotation of said one
roller in the direction of feed, said coil spring
slipping when thesaid one roller is manually
rotated in the direction of feed.
EDWARD BRIGGS DRAKE MACKENZIE.
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