Improvements in Feed Arrangements for High Speed Printing Machines Using Paper in Rolls.
Year: 1898

page_text: Date of Application, 18th Oct., 1898-Accepted, 26th Nov., 1898
[Communicated from abroad by MESSRS. EHRENHARD & GRAMM, of Worms-on-the
Rhine, in the Empire of Germany, Manufacturers.]
Improvements in Feed Arrangements for High Speed Printing
Machines Using Paper in Rolls.
I, SAMUEL SIDNEY BROMIIEAD, of 171, Queen Victoria Street, in the City and
County of London, l'atent Agent, 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 ; —
This invention relates to a feed-arrangement for that class of high speed print-
ing machine which prints on a continuous roll of paper and in which the printing
cylinder, operated by a crank and connecting rod travels to and fro over a station-
ary bed. The paper is held stationary during printing and is caused to advance
only while the press cylinder is not printing. The crank movement for obtaining
the motion of the printing cylinder during its non-printing interval is evenly
distributed on each side of the dead centre.
In order to completely utilize the non-printing interval of the cylinder and to
obtain the most favourable movement for the paper these machines are usually
provided with an irregular supply movement of the paper. Such irregular move-
ment of the paper is obtained by means of a link motion, or by an eccentric
arranged in the well known manner and actuating a toothed segment in such a
manner as to operate the feed-rollers during the longer interval of idle running
of the printing cylinder (which is the time for paper feeding) and return such
toothed segment to its initial position during the shorter or working motion of the
printing cylinder (or stationary period of the paper roll) while at the same time
locking the feed rollers and keeping them stationary.
The accompanying drawings show a feed-arrangement embodying the invention
and suitable for use with the above mentioned class of printing machines.
Fig. 1 of the drawing is a side elevation of the improved feed arrangement and
Figs. 2 and 3 are two diagrammatical views showing the parts in different working
positions and also showing the manner of obtaining a longer period of movement
for the paper as compared with its period of rest.
For example in the drawings annexed hereunto the period of movement of the
paper has been arranged to be exactly double that of rest.
The paper P Fig. 1 for printing, on being drawn off from the roll advances in
the direction of the arrows over guide-rollers and then underneath the printing
cylinder d above the stationary beds where it receives the impression. The
arrangement here shown is suitable for machines in which two impressions are
obtained for every complete revolution of the crank shaft N, that is to say machines
in which printing takes place during the outward as well as during the inward
travel of the printing cylinder d.
The toothed wheels Z and z are so proportioned as to cause the shaft n to per-
form double the number of revolutions than the main or crank shaft N and this
therefore effects the double action of feed. In Fig. 1 the reference letters F and f

page_text: and F1 f respectively designate the feed-rollers which are driven at equal
speed by bevelled toothed wheels as indicated and which receive motion through
the intervention of the toothed segment Z', toothed wheel R, roller and engage-
ment fork E. The toothed segment Z extends beyond its pivot and in such exten-
sion the slot 22 is formed in which a sliding block b travels. The oscillating
motion of the segment Z¹ may be effected through a crank or crank-disc, and the
action of the engagement fork E is determined by means of an eccentric provided
on the shaft n. Obviously the oscillating movement of the slide 2 may if desired,
be obtained through the action of an eccentric.
1
In order to explain the modus-operandi of the improved feed arrangement let
it be supposed that the printing cylinder d has just been travelling from right to
left (Fig. 1) and has completed one impression, it will then be in the position
marked 1. By now continuing its travel further towards the left the paper begin
to move through the influence of the toothed segment which under the acti
of the slide 2 oscillates in the direction of the arrow while at the same time t!
engagement fork E imparts a slight oscillatory motion to the pin. h on the wheel.
and so bring this latter into engagement with the said toothed segment by wh h
it is then rotated. The feed movement of the paper only ceases after the cylinde d
has travelled from the position 1 to position 2 and back again to 3 (see Fig. 2)
during which time the segment 7 has performed an oscillation through the block b
having moved from position 1 over 2 into position 3. During the same time, the
crank-pin engaging the connecting rod attached to the press-cylinder has traveled
through two sixths and the pin y of the block has travelled thr agh
four sixths of a circle. On the cylinder reaching the position 3 the engage-
ment fork E disengages the wheel R from the teeth of the toothed segment nd
then keeps the wheel R and consequently the feed rollers stationary till the me nent
of feeding again commences. On the cylinder d being moved away fror
position into position 4, (Fig. 3) the segment Z will be moved also fre
position 3 into position 4.
it
The segment Z' oscillates in the direction of the arrow against the inter
portion of the teeth in the wheel R, without moving the latter which :
moment is held stationary by the engagement fork. It will be observed
glance at Fig. 3 that the crank pin a has meanwhile only moved throu
sixth and the pin b of the block through two sixths of a circle. Thus it
that the period of feed is equal to two periods of rest, the feed being equal
sixths and the rest equal to one sixth of the time of one revolution.
the
its
ted
nis
a
10-
clear
> two-
By introducing a different pinion w to the one indicated in Fig. 1 the speed of
the feed rollers may be altered to any desired length of feed.
+
Having now particularly described and ascertained the nature of my said
invention. and in what manner the same is to be performed, I declare that what
I claim is
An improved feed arrangement for high speed printing machines having a
stationary bed with reciprocating printing cylinder for printing on a continuous
roll of paper or web, characterized by a toothed segment in con-
junction with an engagement fork actuating the feed rollers, the seg
ment being arranged as to operate the feed rollers during the time the
printing cylinder is away from the stationary bed, and to return to its initial
position at an increased speed during the working of the cylinder while the engage-
ment fork retains the feed-rollers; the object being the complete utilization of
the period of idle running of the printing cylinder, substantially as hereinbefore
described.