Improvements in Letter and like Copying Apparatus.
Year: 1897

page_text: Date of Application, 6th May, 1897—Accepted, 24th July, 1897
COMPLETE SPECIFICATION.
Improvements in Letter and like Copying Apparatus.
I, HERMANN KRANDT, agent of Rostock, Germany, do hereby declare the nature
of my said invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement:-
1
In apparatus hitherto known for copying letters the disadvantage has been
noticed that the copying paper is very often irregularly moistened, so that
patches of the same remained comparatively dry and did not copy properly.
The object of the present invention is to provide a copying machine in which
the copying paper is equally moistened without unnecessarily straining the same,
and, in order to attain this object I have constructed a machine comprising the
hereinafter described parts.
In order to render the present specification more easily intelligible reference is
had to the accompanying drawing which is a diagammatical representation of
the machine.
f
According to the present invention a cloth band is arranged to run through a
water reservoir a said band being guided over a rubber roll e mounted in the frame
of the apparatus between a metallic roll d and an upper metallic roll f, so that
both metallic rolls operate to press the band on to the rubber roll e. The
metallic rolls d and c are adjustable as regards the rubber roll e by means of screws
in connection with their bearings as indicated diagrammatically at i. A verti-
cally adjustable pressure foot e extends into the water of the reservoir a and
serves to adjust the degree of moisture of the band b. Obviously the tighter the
foot is adapted to press on the inner side of the band the more the latter will
be wrung out before contacting with the copying paper. The free side of the
cloth band is guided over a guide roll r. The copying paper is mounted
on a roll g suitably mounted in the machine frame and this paper passes between
rolls and where it contacts with the wet band b. It is then guided over the
roll and between this and the roll at which point the copying takes place.
The letters are passed from the desklike left hand portion of the
over the adjustable bar between the said rolls and . The copying
paper after having received the copy, passed over the roll n round the roll o' an
to rolls on which it is wound. On the Spindle of the roll o is mounted a fan
device represented by the letter p which dries the damp copying paper as it passes
over the said roll o. To the shaft of the roll is keyed a driving disc r which drives
the ventilator p by means of the belt or cord qu, the roll s is driven by means of
a belt from the shaft or roll or disc r. The rolls e and d are coupled by means of
a belt and run in the directions of the arrows and roll f is moved by the friction
of the paper passing thereover and operates the roll e." The roll is adjustable
towards or from the roll 7 by means of the screw m in connection with its bearing.
The device operates in the following manner:-
frame
The copying paper coming from the roll passes the moistening band b
between the rolls c and f and meets the letter fed to the machine at
he point between the rolls and it then passes on over the rolls and o to ↳

page_text: where it is wound off. The foot c is adjustable so that any desired degree of
moisture may be attained according to whether the said foot is adjusted to
press more or less on the said band.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. A copying machine in which an even moistening of the paper is effected
by means of an endless band guided through a reservoir containing water and then
between suitable rolls, by which it is wrung out, whilst the utilised copying
paper containing the copies is dried by means of a ventilator in connection with
the driving gear of the machine and then wound off on a suitable roll substantially
as described.
2. In the device covered by claim 1 the arrangement of an adjustable foot to
bear on the interior of the endless band as it passes through the water said foot
being vertically adjustable in the manner and for the purpose substantially as
described.
1005
ப
HASELTINE, LAKE & Co.,
45 Southampton Buildings, W.C., Agents for the Applicant.