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Патент USA US2132068

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Oct. 4, ‘1938.’
J, E, EUTH
2,132,068
CARBON nowme AND RETRACTING DEVICE FOR DUPLICATING MACHINES
Filed May 17, 1937
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Oct. 4, 1938.
‘J, ‘E. ‘EUTH
2,132,068
CARBON HOLDING AND RETRACTIN-G DEVICE FOR DUPLICATING MACHINES
’ Filed May 17, 1937
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2,132,068
Patented Oct. 4, 1938
UNITED STATES PATENT orrlcs
2,132,068
CARBON HOLDING AND RETRACTING DE
VICE FOR DUPLICATING MACHINES.
John E. Euth, Chicago, 111., assignor to United
Autographic Register (30., a corporation of Illi
nois
Application May 1'7, 1937, Serial No. 143,180
(01. 197-126)
5 Claims.
This invention relates to an attachment for a
duplicating machine for retracting the carbon or
transfer slip from an advanced to a succeeding
set of forms.
7
.
'
The primary object of the invention is to pro
vide a simple and easily operable attachment
7 which may be mounted on the platen carriage of
a typewriter and adapt the machine to ?ll in
forms on continuous-form stationery.
The invention is illustrated in a preferred em
bodiment in the accompanying drawings, in
which:
Figure 1 is a side elevational view of a type
writing machine equipped with the attachment;
Fig. 2 is an enlarged transverse sectional view,
taken as indicated at line 2 of Fig. 4, showing
the carbon in retracted position; Fig. 3 is a view
similar to Fig. 2 but showing the carbon in an
advanced position prior to it being retracted; Fig.
4, a front elevational view of the device with an
associated platen roll; and Fig. 5, a fragmentary
view, partly in section, showing the supply roll
1' gripping device and mechanism for retracting
the carbon strip.
In the embodiment illustrated, A designates
a typewriter having a shiftable carriage A’
equipped with a platen roll A2; and B, an im
proved typewriter attachment for storing and
retracting a carbon strip.
'
The typewriter A may be of the standard con
struction well-known in the art and has a shift
able platen carriage A’ in which a platen roll A2
is rotatably mounted. The typewriter is equipped
with the usual presser mechanism, not shown,
and a hand operable lever 6 for throwing off
the presser mechanism so that the stationery
may be'withdrawn by hand.
The attachment B comprises a frame secured
to the platen carriage by means of forwardly ex; ,
tending arms ‘I, and has a pair of upwardly ex
tending slotted side members 8 in which are jour
nalled the various guide rolls and carbon supply
roll.
‘
>
In the embodiment illustrated, the attachment
is adapted to supply carbon for but one record
copy but additional mechanisms, operating on,
the same principle, might be provided, if desired,
so'that more than two strips of stationery might
be used. The frame has a transversely extend
ing cross-bar 9 which holds the side members in
spaced relation. A pair of guide rollers l0 and
H are journalled on cross-bars I2 and I3, respec
tively, in the top of the frame and a carbon de
pressing roller I4 is journalled on a cross-rod
85 which extends through guide slots 16 provided
in the side members 8. The ends of the side mem
bers 8 extend upwardly above the guide rolls and
form lateral guides for the record strip H which.
is led over the guide rollers l0 and II. The origi
nal copy strip 18 is threaded through the lower 5
part of the attachment and over the guide plate
l9 provided on the platen of the typewriter. A
carbon supply roll 20 is mounted on a supporting
shaft 2| which may be introduced into its position
in the frame through forwardly and downwardly
extending slots 22. One end of the shaft 2| is
threaded to receive a ?nger operated clamping
nut 23 whereby the roll 20 may be releasably
clamped against rotation to prevent a carbon
strip 24 from being unreeled. The opposite end 15
of the shaft is provided with a knob 25 for re
winding the carbon strip on the roll, as will be
described below.
The carbon strip, as shown in Figs. 2 and 3,
is led up over the guide roller ll, beneath the re
tracting roller l4, over the guide roller ID to the
platen in interleaved relation with the stationery
strips H and I8. Usually the stationery strips
are provided with printed forms that are sepa
rated by lines of weakening 26 and pairs of reg 25
ister perforations 2'! which may be utilized for
?ling purposes.
In order to depress the roller M, a rock shaft
28 is journalled in the side members 8 and is
provided at its ends with rigidly connected arms 30
29 which are slotted, as indicated at 30. to make
lost motion- connections with the ends of the cross
rod l5. ‘One of the arms ,29 is provided with
a finger piece 3| to facilitate its operation. A
torsion spring 32 is secured to the shaft 28 and 35
one side member 8, and urges the arms 29 into
their uppermost position.
‘ Operation
In using the device the stationery strips “and
i8 are interleaved with the carbon strip 24, as
indicated in Fig. '2, and led around the platen
into typing position. As the advanced form is
typed in, the stationery and carbon gradually ad
vance to the position indicated in Fig. 3 by means
of the ordinary platen roll feed mechanism. At
this point, the platen feed mechanism is released
by the hand lever 6 and the advanced ends of the
stationery are gripped slightly above the end of
the'interleaved carbon strip by one hand of the
operator. With the other hand the operator de
presses the ?nger piece 3| as far as possible,
which causes the roller M to form a loop in the
carbon strip and retract it into the succeeding set
of forms. The advanced and completed set of
2
2,132,068
forms may then be detached along the line of
weakening 26,- the presser lever 8 operated to
throw the presser mechanism back into operation,
and the machine is again ready for use. When
the operator releases the ?nger piece 3|, the
spring 32 will raise the roller M to its uppermost
position leaving a loose loop of carbon as indi
cated in Fig. 2. These operations'may be re
peated until the carbon becomes worn and it is
10 desired to feed fresh carbon. To accomplish this
the ?nger nut 23 is released to permit rotation of
the carbon roll and permit a desired fresh length
to be advanced around the platen A2. The opera
tor may then tear off a length of carbon after
15
detaching the form along the line of weakening
26, and by gripping the ends of the forms sepa
rately and backing up the carbon supply roll by
means of the knob 25, the carbon may be retracted
su?iciently back of the ends of the stationery
20 strips to facilitate obtaining a grip. The station
ery may be realigned by reference to the per
forations 21. The presser mechanism is then
permitted to grip the newly loaded set of forms
against the platen roll and byv operating the
25 ?nger piece 3|, a proper length of fresh carbon
will be withdrawn from the roll. After the ?nger
nut 23 is tightened, the device is again ready for
regular operation.
Thus it will be understood that a very simple,
which enables the operator to retract the carbon
exactly one form length without dimculty or loss
of time. As the roller I4 forms a loop in the
strip 24, the carbon will be retracted a distance
35 equal to about twice the travel of the retracting
roller.
'
-
The foregoing detailed description has been
given for clearness of understanding only, and no
unnecessary limitations should be understood
40 therefrom, but the appended claims should be
construed as broadly as permissible, in view of the
prior art.
'
a loop in said carbon strip and retracting its end
portion a form length into the succeeding set of
forms comprising a roller journalled in a pair
of arms provided with a spring normally urging
said .roller upwardly out of the bottom of the
carbon loop.
'
2. A device as speci?ed in claim 1, in which the
carbon supply roll is journalled in said frame and 10
is equipped with releasable gripping means to
prevent fresh carbon from being withdrawn
from the roll while the strip is being retracted
within the forms.
3., In a typewriter equipped with a shiftable 15
carriage having a rotatable platen around which
continuous stationery strips may be led from the
rear, a carbon holding attachment comprising:
a frame mounted on said carriage; a carbon sup
ply roll journalled in said frame and provided 20
with means to prevent rotation therein; a pair
of guide rolls journalled in the upper part of said
frame under which one stationery strip may be led
and over which another stationery strip and a
carbon strip extending from the supply roll may 25
be led to the platen; a depressible roller in said
frame disposed over the carbon strip and between‘
- said guide rolls; a spring urging said‘ roller up
30 light and easily operable mechanism is provided
I claim:
leaved relation with said strips; and manually
operable means adjacent to said guide for forming
,
'
~
1. In a duplicating machine adapted to ?ll in
45 forms on continuous-form stationery strips, a
carbon retracting device comprising: a. frame; a
strip guide in said frame; a carbon supply roll
mounted in said frame from which a carbon
strip may be led forwardly over said guide in inter
wardly and means for depressing said roller to
form a loop in said carbon strip and retract its 30
advance end from the ends of said stationery
strips.
'
4. A device as speci?ed in claim 3, in which the
frame is provided with slots between the guide
rolls and the roller is guided by said slots; the de 35
pressing means comprises a pair of oscillating
arms adapted to engage and depress said roller;
and the spring urges the arms upwardly with the '
roller.
5. A device as speci?ed in claim 3, in which 40
the frame is provided with guide slots between
guide rolls for receiving and guiding the ends of
the roller; the depressing means comprises a
manually operable rock shaft provided with a pair
of forwardly extending arms making lost motion 45
connections with the ends of said roller; and the
spring is coiled on said rock shaft so as to urge
the arms upwardly with the roller.
“
JOHN E. QEIU'I'H.
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