A New or Improved Apparatus for Watermarking Paper.
Year: 1893

page_text: Date of Application, 13th May, 1893
Complete Specification Left, 13th Dec., 1893-Accepted, 13th Jan.,
1894
PROVISIONAL SPECIFICATION.
A New or Improved Apparatus for Watermarking Paper.
I, WALTER KNOWLES TROTMAN, of No. 59 Park Street, Stoke Newington,
in the County of London, Dandy Roll Maker, do hereby declare the nature of
this invention to be as follows :—
When it is desired to watermark paper in the course of manufacture on a
machine, it has heretofore generally been accomplished by means of a dandy-roll
having the device of such watermark formed by sewing, soldering, or similarly
securing wire or the like on its outer periphery, which device stands out in relief
thereon. This method has necessitated the employment of a separate dandy-roll
as well for each watermark as for different sizes of paper. My invention has for
its object to overcome that necessity and comprises the provision of means whereby
the watermarking letters or devices may be interchanged without the removal and
substitution of a fresh dandy-roll.
According to my invention I form a skeleton roll on a metal tube with journal
and spindle at each end. Segmental fittings are formed by securing to suitable
end frame-work a number of bars or tubes, the outer circumference of each, fitting
being an arc of a circle. The end pieces or framework are provided with slides
or their equivalents which engage with projections on the centre tube, or other
means are provided whereby the distance of the segmental pieces from the axis
of the skeleton roll may be varied. The desired watermark or marks are made in
the same manner as they have hitherto been on a dandy-roll, but, according to my
invention, their foundation is only a movable section or pad of sufficient size to
bear the device of the watermark. These movable sections or pads are on their
under sides provided with means for detachably securing them to the bars or tubes
above mentioned.
The above apparatus is intended to be used in conjunction with the ordinary
plain dandy-roll.
1000
A. F. SPOONER,
124, Chancery Lane, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
A New or Improved Apparatus for Watermarking Paper.
I, WALTER KNOWLES TROTMAN of No. 59 Park Street, Stoke Newington, in
the County of London, Dandy Roll Maker, 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 :-
When it is desired to watermark paper in the course of manufacture on a
machine, it has heretofore generally been accomplished by means of a dandy-roll
having the device of such watermark formed by sewing, soldering, or similarly
securing wire or the like on its periphery which device stands out in relief thereon.
This method bas necessitated the employment of a separate daudy-roll as well for
each watermark as for different sizes of paper. My invention has for its object to
overcome that necessity and comprises the provision of means whereby the water-
marking letters or devices may be interchanged without the removal and substitution
of a frach donde roll

page_text: O accompanying utawings
in which;-
Fig. 1 is a view partly in elevation and partly in longitudinal section of a roll
constructed according to my invention.
Figs. 2, 3 and 4 are transverse sections taken respectively on the lines 2-2,
3-3 and 4-4 of Fig. 1.
Fig. 5 is a section corresponding with Fig. 4 of the roll arranged for water-
marking a larger size of paper than that for which the roll as arranged in Figs. 1
to 4 is designed.
Fig. 6 is a plan of one of the pad carrying frames detached from the roll and
Fig. 7 is an edge view of the pad with modified means for securing it to the
frames.
Like letters indicate like parts throughout the drawings.
A is a body preferably constructed of metal tube as shown, the ends of which
may be closed by metal plugs A¹ provided with journals A2 by which the improved
roll is mounted in its bearings in the paper making machine at preferably a short
distance away from the dandy roll which in a machine wherein the watermarking
is effected according to this invention is plain, having no watermarking device
upon it.
On the tubular body A are provided two conveniently circular fixed collars A³
and one or more collars A* each having say four dovetail recesses A dividing its
periphery into four equal parts.
B are two drums fitting on the ends of the tubular body A at the outside of the
collars A and provided at their inner ends with openings B'₁ large enough to
accommodate the ends of the frames C and at their outer ends with openings B²
to admit of the screw-threaded pins or bolts C₁ passing through them.
Each frame C consists of two preferably T-shaped bars or rails C₂ rigidly
united at their ends as at C³ Fig. 6 in any convenient manner and at one or more
parts by blocks C* the number and position of which preferably correspond with
the number and position of the collars A fixed on the tubular body A. Each of
the blocks C is provided with a dovetail projection C5 to fit into one of the before
mentioned dovetail recesses A³ of the collars A* and into the ends C³ of the
frames C are screwed or otherwise suitably secured the pins or bolts C¹.
D is a watermarking pad or impression plate carrying any desired device D' to
be impressed in relief; this plate is curved to suit the size of roll to which it is
applied. At its back the plate D may, as shown in Figure 3, be provided with a
bolt or screw D² over which is passed a clamping plate D³ adapted to be forced
tightly against the back of the bars C2 by means of the nut D screwing on D²;
by this arrangement the pad D may be secured in any desired position on the
frame on which it is mounted, or the pad D may be retained in position on frame C
with sufficient firmness for all practical purposes by two or more clips D
(Figure 7) secured to the back of said pad and adapted to engage with the
outer flanges of each pair of bars C2 which as shown in dotted lines in Fig. 6,
are recessed as at C' to admit of the pad being applied to the frame C as will
be well understood. At all parts of the frame excepting at the recesses the clips
fit tightly against the outer flanges of the bars C so that the pad D will be
retained in any position to which it is adjusted until again moved by hand.
E Fig. 5 is a collar or ring provided at its interior with dovetail projections E'
to fit the dovetail recesses A of collar A and at its exterior with dovetail
recesses E² to receive the dovetail projections C³ of the blocks C* all as shown in
Figure 5.
From the foregoing description it will readily be understood that by loosening the
nut D the pad D may be moved along the frame C on which it is mounted and
secured in any desired position thereon by again tightening the nut.
It will also
be obvious that one, two or more pads D may be mounted at different parts of the
same frame,
In Figs. 1 to 4 I have represented the roll as with accommodation for four

page_text: frames C (each fitting into one of the openings B') though with only two
applied, it will be obvious however that the roll may be constructed for carrying
one, two or any other suitable number of frames and that any number of frames
up to the limit of accommodation may be fitted to the roll; thus in Figs. 1 to 4
only two frames C are shown which is two less than the full complement.
When it is desired to arrange the roll for watermarking paper of a larger size
than that for which it is shown arranged for in say Fig. 1 all that is necessary
is to remove the winged nuts C from the pins C' slip the drums B off the ends
of the tubular body A fit a collar E of the desired size on the fixed collar A' and
place drums of the required diameter on the ends of A. The ends of the frames C
are then inserted in the drum openings B' (the diametrically opposite ones of
which will be farther apart than in the drums last removed) the pins C₁ passed
through openings B' the dovetail projections C³ engaged with the recesses E³ and
the winged nuts screwed on the pins C¹ until the drums are pressed tightly against
the collars A. After this the pads are secured in their proper positions on the
necessary frames C and the roll is then ready for use.
The periphery of the drums is preferably roughened so that they may be rotated
by contact with the endless apron or bed of the paper-making machine.
The before described apparatus may be modified without departing from the
spirit of the invention; for example the frames C may be connected to the tubular
body A by brackets by means of which they may be adjusted radially in
relation to A.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;-
1. For watermarking paper an adjustable pad-carrying roll substantially as
described.
2. A roll for watermarking paper on which the pads or impressing devices may
'be adjusted either longitudinally or circumferentially or both substantially as
described.
3. In a roll for watermarking paper the combination with a central body such
as A of removable drums and one or more frames such as C substantially as described
and illustrated in the accompanying drawings.
4. In a roll for watermarking paper the combination with a central body of one
or more radially adjustable pad-carrying frames substantially as described.
5. For watermarking paper the combination with a roll of a pad or impressing
device adjustable thereon substantially as described.
6. In a roll for watermarking paper the combination with drums and one or
more frames such as B & C of one or more collars or sets of collars such as A*
or A and E substantially as described and illustrated in the accompanying
drawings.
7. The combination and arrangement of parts constituting the complete water-
marking apparatus substantially as described and illustrated in the accompanying
drawings.
Dated this 26th day of October 1893.