Improvements in Relief Colour Stamping Presses.
Year: 1895

page_text: Date of Application, 5th Dec., 1895
Complete Specification Left. 31st Aug. 1896-Accepted. 31st Oct.
1896
PROVISIONAL SPECIFICATION.
Improvements in Relief Colour Stamping Presses.
I, ROBERT FRITH SPROULE of Kittsbury, Berkhampstead, in the County of
Hertford, Engineer, do hereby declare the nature of this invention to be as
follows:-
--
My invention relates to stamping presses of the kind in which a lower die
engraved in intaglio is caused to travel under a colour brush and wiper and then
under an upper or counter die which is caused by a screw to descend upon, and
impress with colour, paper or other receptive surface interposed between the dies.
The screw of the press is according to my invention worked from a continuously
revolving shaft in the following manner. A crank eccentric or cam on the shaft
gives reciprocating motion to a horizontally guided rack which gears either
directly or through intermediate gear with a pinion fixed on the vertical screw of
the press, this pinion being of such depth that it remains in gear during the whole
ascent and descent of the screw. In order to relieve the gear of shock at the
starting and stopping of the screw, the rack may be fitted to play a little between
springs or elastic buffers on the rod which moves it. For moving the slide that
carries the die to and from the inking brush, I provide on the shaft from which the
screw is driven an eccentric or cam to work a horizontally sliding rack which gears
with a pinion on the shaft of a cylinder mounted below the die slide, and having
its axis parallel to the slide. On the periphery of this cylinder there is a helical
cam groove engaging a stud projecting down from the slide. As the driving shaft
revolves, working the screw of the press, it also causes the cam cylinder to
reciprocate, and the die slide to travel to and fro, its movements being suitably
timed to those of the press screw.
In order to vary the blow of the press, I fit balls or weights of other form, to
slide on the cross-head of the screw and I mount on the crosshead a right and left
hand screwed spindle, by turning which the balls are caused simultaneously to
approach towards or to recede from the axis of the screw. This adjustment of the
balls is obviously applicable to presses worked by hand.
Dated this 5th dow of Dosombor 1905
ABEL & IMRAY,
Agents for the Applicant.
Improvements in Relief Colour Stamping Presses.
I, ROBERT FRITH SPROULE, of Kittsbury, Berkhampstead, in the County of
Hertford, 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 :-
My invention relates to stamping presses of the kind in which an engraved lower
die is caused to travel under a colour brush and wiper and then under an upper or
counter die which is caused by a screw to descend upon and impress with colour a
Primal

page_text: .
piece of paper or other receptive material interposed between the dies. The chiet
object of my invention is to obtain all the required movements, suitably timed from
continuously rotating shaft, and to provide for adjustment of the impression as
I shall describe referring to the accompanying drawings.
a
Fig. 1 is a front view of a press embodying my invention. Fig. 2 is a plan,
Fig. 3 is an elevation of the left side. Fig. 4 is an elevation of the right side.
Fig. 5 is a section on the line X X of Fig. 2.
A is the main shaft provided with fly wheel A' and fast and loose pulleys A².
A grooved cam A³ on the shaft A acts on the roller of a guided sliding rod B
which has connected to it by an adjusting screw and nuts B₁ a rack B2 caoutchouc
or other elastic washers B3 being interposed between the end part of the rod B
through which the screw passes and the washers compressed by the nuts B¹ for the
purpose of deadening shock. The rack B2 gears with a pinion C' at the lower end
of a vertical rock shaft C on the upper end of which is fixed a toothed segment C²
gearing with a pinion C³ fixed on the press screw D. The pinion C³ is of such
depth that it remains in gear with the segment C2 during the whole up and down
stroke of the screw D.
In order to relieve the screw from lateral strain I prefer to hollow the pinion C³
at its under side and to provide on the top of the frame a boss D' on which the
pinion revolves as on a bearing.
On the shaft A is fixed a grooved eccentric E engaging in its groove a roller on
a horizontally sliding rod E terminating in a rack gearing with a pinion E³. On
the shaft of this pinion is a grooved barrel cam E³ in the groove of which is engaged
a travelling roller E' on a stud projecting down from the sliding table F which
carries the lower die F¹ and the ink or colour duct F2. It is to be understood that
the cam E is of sufficient length to cause the die F1 to move to the right far
enough to pass the colour brush G which receives colour from the duct ² as it
passes under it. The slide of the brush has a to and fro movement imparted to it
by an arm G on a vertical rocking shaft G2, another arm G³ on which is moved
by a rod G which has a roller engaged in the groove of a cam G³. This cam is
of such shape and so set on the shaft A that the brush G receives its to and fro.
movement while the die F¹ is under it, the die being thus coated with the colour.
As the die moves to the left with the colour on it, it passes in the usual way under
a strip H of paper by which the superfluous colour is wiped off leaving the colour
only in the engraved lines. At every stroke of the table F, a stud F³ at its side
moves to the right a lever arm H which carries a pawl engaging in a ratchet
wheel on the axis of a reel H³ so that the reel being partly turned winds on it a
portion of the strip H which is drawn from a reel H' and carried under guide
rollers and a pad H¹. Thus every time the die F' passes under H₁ a fresh portion
of the strip H effects the wiping. When the stud F3 returns to the left a
weight H causes the lever arm H to return against a fixed stop stud H³.
From the above description of the operating part of the press it will be
understood that as the shaft A revolves the cam A³ through its connections to the
pinion C³ causes the screw D to turn alternately in opposite directions thus causing
the upper die D' to descend alternately upon the paper or other material placed on
the lower die F' giving the impression and to ascend leaving the impressed piece of
material free to be removed and a fresh piece to be placed on F. Also the
excentric E causes the barrel cam E³ to revolve to and fro thus causing the
table and the die F¹ upon it to move alternately to the right to receive colour
from the brush G, and to the left to have superfluous colour wiped from it by the
strip H and then to bring the lower die under the upper die. Furthermore the
cam G gives the brush Gits to and fro movement so as to coat the lower die with
colour, and the stud F³ causes the reel H³ to revolve step by step so as to bring
fresh portions of the strip H to wipe the die.
In order to vary the force of the impression I mount upon the screw cross
head D a right and left hand screwed spindle D³ which passes through threaded
holes in the balls D. By turning the screw spindle D³ in the one direction or the

page_text: other, the balls D' can be moved simultaneously and equally towards or away from
the axis of the screw thus giving less or greater force to the impression of the die.
Many parts of the press which I have described are old and well known such as
the screws, the dies, the travelling table and the inker and wiper for the die and to
these I make no claim.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In combination with a continuously rotating shaft a cam thereon adapted to
move to and fro a rack gearing with a pinion on a rock shaft, a toothed segment
on which gears with a pinion on the press screw, of such depth that it remains in
gear with the segment during the whole stroke of the screw, substantially as
described.
2. In combination with a continuously rotating shaft an eccentric thereon
adapted to move to and fro a rack gearing with a pinion on the axis of a grooved
barrel cam, the groove of which engages a roller mounted on the travelling table,
substantially as described.
3. In combination with the press screw and the balls on its cross head a right
and left handed screw spindle, adapted to adjust the distance of the balls from the
axis of the screw, substantially as described.
Dated this 31st day of August 1896.
ABEL & IMRAY,
Agents for the Applicant.