IMPROVEMENTS IN ROTARY PRINTING MACHINERY
Year: 1882

page_text: LETTERS PATENT to James Dobson Printer & Stationer 39 Curtain Road
London, E.C. for an Invention of IMPROVEMENTS IN ROTARY PRINTING
MACHINERY.
PROVISIONAL SPECIFICATION left by the said James Dobson at the Office
of the Commissioners of Patents on the 11th October 1882.
JAMES DOBSON, Printer & Stationer, 39 Curtain Road, London, E.C.
MENTS IN ROTARY PRINTING MACHINERY
IMPROVE-
The object of this Invention is to provide a machine that will print paper bags
or sheets from Stereotyped plates or equivalent printing surfaces with economy
and dispatch To this end I fit the periphery of a horizontal Cylinder with one or
more stereotyped plates behind or above which I mount the inking apparatus &
operate the same by suitable gearing Between this Cylinder and the Feed Board
I place the Impression Cylinder which turns in adjustable bearings at the same
speed as the plate cylinder & is fitted with a. drop bar and tapes or with grippers
for seizing the bag or paper which is delivered by means of endless tapes on suitable
rollers down opposite a flyer or into a sliding arrangement and placed upon the
delivery board or into a suitable receptacle. To increase the rapidity of "feeding-in" I
have made arrangements by means of travelling adjustable markers. or equivalent
propellers working in slots on the feed board-these propellers are worked by
connecting rods or arms attached to a Disc or Cam fixed on each end of one of the
Cylinders-On the feed board I mount adjustable guides-one running at right
angles with the drop bar or gripper-the other being at right angles with the drop
bar or gripper at the mouth, and widening backwards in a curve towards the start
point of. the propellers. By this means together with the action of the propellers
an "Automatic Feed" is secured by a random "Lay-on," inasmuch as the propellors
push the bag or paper forward to the drop-bar or grippers while the guides regulate
the angle at which it shall be presented; and being adjusted to the exact width of
the bag or paper correct "Register" is produced By using, when the size permits
two sets of plates propellers and guides an operator is enabled by, taking up with
both hands, to make a double "lay-on" & thus still further increased speed of
printing is secured

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said James Dobson in the Great Seal Patent Office on the
10th April 1883.
JAMES DOBSON, Printer and Stationer, 39 Curtain Road, London, E.C.
"IMPROVEMENTS IN ROTARY PRINTING MACHINERY"
The object of this Invention is to provide a machine that will print paper bags
or sheets from stereotyped plates or equivalent printing surfaces with economy
and despatch.
To this end I fit the periphery of a horizontal cylinder with one or more
stereotyped plates behind or above which I mount the inking apparatus and operate
the same by suitable gearing-Between this cylinder and the Feed board, I place
the Impression cylinder which turns in adjustable bearings' at the same speed, ns
the plate cylinder and is fitted with a drop bar and tapes or with grippers for
seizing the bag or paper which is delivered by means of endless tapes on suitable
rollers down opposite a "flyer" or into a sliding arrangement and placed upon the
delivery board or into a suitable receptacle. To increase the rapidity of "Feeding
in" I have made arrangements by means of travelling adjustable "Markers
or equivalent propellers working in slots on the feed board-These propellers are
worked by connecting rods or arms attached to a disc or cam fixed on each end of
one of the cylinders-On the feed board I mount adjustable guides, one running
at right angles with the drop bar or grippers, the other being at right angles with
the drop bar or gripper at the mouth and widening backwards in a curve towards
the start point of the propellers-By this means together with the action of the
propellers an "Automatic feed" is secured by a random "lay-on" as hereafter
more particularly described.
And in order that my said Invention may be well understood, I shall now proceed
particularly to describe the same with reference to the accompanying drawing on
which like letters of reference indicate corresponding parts in all the figures.
Figure 1 represents a side elevation of a Rotary printing machine embodying my
Invention, Figure 2 front elevation thereof and Figure 3 a detached bird's eye view
or plan of parts of Figures 1 and 2.
represents a horizontal cylinder fitted with one or more stereotyped plates or
equivalent printing surfaces and behind (as shown) or above which is mounted the
inking apparatus b. Between the cylinder a and the Feed board c is placed the
impression cylinder & which rotates in adjustable bearings e at the same speed as
the cylinder a and is with the latter and inking apparatus 6 operated by suitable
spur (or other) gearing 1 to 8 driven either by a crank shaft and treadle motion f
or by riggers and belting from any suitable motor as found most convenient-
Immediately above the impression cylinder d is fitted the "drop bar" or roller /
(or grippers may be used if desired) and endless tapes i for seizing the bag or paper
to be printed, which is then passed by the tapes round the Impression cylinder d
and delivered at j down opposite n". Flyer" or into a sliding arrangement (not
shewn on the drawing) where it is placed upon the delivery table-The endless
tapes i on leaving the Impression cylinder d pass over suitable rollers & as shewn.
For increasing the rapidity of "Feeding in," I employ an arrangement of
travelling adjustable "markers" or equivalent propellers working in slots m in
the feed board c (seen more particularly in the detached view figure 3)-These
propellers may be reciprocated lengthwise to the feed board c by slotted arms n
which are arranged beneath (or otherwise relatively with) the feed board c (one on
each side of the machine) and caused to vibrate by connecting rods o which are

page_text: "
coupled to discs or cams p (one at each end of the Impression cylinder d) and are
also slotted and adjustable with the slotted arms n so as to vary the stroke or travel
given to the propellers 7 as required-On the feed board c are placed adjustable."
guide bars or pieces 9 and r-One guide bar q is arranged for its entire length at
right angles with the "drop bar or roller h whilst the other guide bar or piece r
runs only for a short distance at right angles, to the "drop bar" or roller h and
thence is widened or curved outwards or backwards towards the start point of the
propellers by which means, combined with the reciprocating action of the latter
an Automatic Feed" is secured by a random "lay-on" the propellers / pushing
the bag or paper forward to the "drop bar" or roller h (or grippers as the case
may be) while the guides q and r regulate the angle at which it shall be presented
and being adjusted by set screws or other device, to the exact width of the bag or
paper, correct "register" is produced-By using, when the size permits, two sets
(as shewn in figure 3) of plates, propellers and guides q and r, an operator is
enabled by taking up with both hands to make a double "lay-on," and thus a still
further increased speed of printing. is obtained.
Having now described and particularly ascertained the nature of my said
Invention and the manner in which the same is or may be used or carried into
effect I would observe in conclusion that what I consider novel and original and
therefore claim as my Invention, is :-
The application and use to rotary printing machines of a "Feeding in" arrange-
ment composed of adjustable reciprocating markers or equivalent propellers, in
combination with the feed board and with specially formed and adjustable guide
bars or pieces, substantially as and for the purpose herein before described and
illustrated by the accompanying drawing.
In Witness Whereof I the said James Dobson have hereunto set my hand
and seal this sixth day of April in the year of our Lord One thousand
eight hundred and eighty three.
JA DOBSON. (L.S.)