A Device for Intermittently Shifting and Stopping an Endless Web of Paper or another Material to be Printed Upon or otherwise Worked.
Year: 1899

page_text: Date of Application, 5th June, 1899-Accepted, 22nd July, 1899
A Device for Intermittently Shifting and Stopping an Endless Web
of Paper or another Material to be Printed Upon or otherwise
Worked.
I, WILHELM MÜLLER, of Heidelberg, (Baden), Germany, 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 device for intermittently stopping any portion of an
endless web of paper or another material continuously and uniformly supplied at one
end and in the same manner delivered at the other end in order to allow of printing
upon or otherwise working the said portion when at rest.
Devices of this kind are employed especially in flat bed web-printing presses but
show hitherto the inconvenience that in passing of the portion of web to be inter-
mittently shifted from the condition of rest into that of movement, a sudden
alteration is produced in the tension of the web, causing tearing and breaking of the
paper and considerable trouble in working. To avoid this is the object of the present
invention which is especially intended for printing presses.
Experience has shown that the breaking and tearing of the paper is essentially
caused by that hitherto the reciprocating frame with the guide rollers for the paper
has been moved vertically and too directly driven by means of cams, the consequence
of which is that the swinging parts which, owing to their own weight, are retarded
in the upward and accelerated in the downward movement, do not perform strokes
precisely limited, nor work softly and without shocks. These inconveniences are
obviated in the present invention by arranging the roller frame to reciprocate
horizontally and driving it more softly by means of a rod-and-lever system which
compensates the shocks arising from the cam action. My invention further allows
of varying the extent of the shifting stroke of the web, so that when applying my
invention to printing presses, different sizes can be printed on one and the same
press.
Figures 1, 2, and 3 are side views of different forms of my invention.
The web of paper indicated in Figure 1 by a broken dotted line, is uniformly fed
from a roll 0 by means of the stationary and uniformly revolving feeding cylinders 8, 8¹,
and likewise uniformly delivered by a pair of stationary and uniformly revolving
delivery cylinders 84, 85, running with the same speed as cylinders s, s¹, as usual in web-
printing presses. The web is guided on guide rollers V, p, p', p², p³, w¹, V1, the
rollers, p, p, p, p, w¹ being stationary, whilst the rollers V, VI, are journalled in two
bars U reciprocated horizontally in guides L, L', L². In the drawing only one bar U
is shown.
The portion of the paper between rollers 22, 23, has been sketched in the drawing,
and for the sake of simplicity, broken away; it may be carried any way, and, for
instance, in a printing press round the impression cylinder or cylinders. The portion
between p² and p³ is intended to be intermittently stopped. This is brought about
by accordingly controlling the reciprocating movement of the bars U which move in
unison with each other.

page_text: To this purpose, two levers X are mounted on a rock shaft Y, engaging by a
gearing with racks fixed to bars U, Figure 1.
A slotted lever Z is mounted on shaft Y, and a pin a engages with the lever slot,
adjustable therein by means of a screw-bolt h. A rod 6 is pivotted to the pin a, sliding
with its slotted free end on the driving shaft T and bearing with rollers c, d, against
two cam dises provided on shaft T at either side of the rod end. Motion is imparted
to shaft T by a gear wheel f, engaging with a, gear wheel e of half the diameter
mounted on shaft T. The extent of each shifting stroke is controlled by accordingly
adjusting pin a by means of screw-bolt h journalled in lever Z. As thereby the
distance of the engaging pin a of, rod b from shaft Y can be varied, the stroke of
levers X and therefore that of the bars U will be accordingly altered, the stroke
of rod however being unchanged owing to the unchanged working condition of
cams S.
If for instance, a length n of paper is to be uniformly fed and delivered at each half
revolution of wheel f, i.e. at each complete revolution of wheel e, a suitable speed is
imparted to the feeding cylinders s, s¹, and to the delivery cylinders 84, 85, by means
of a convenient connection with, the wheel f, say, by a system of gear wheels
inserted between gear f and the said cylinders, and pin a is adjusted so as to impart,
a stroke of n to bars U.
If now, during a quarter of revolution of wheel f, i.e. half a revolution of wheel e,
levers X are rocked towards the left, a length of paper of n² will be fed in the meantime
from roll 0; but as the same length of paper is taken up by roller V moving towards
the left a distance of n/ and by the loop continuously increasing by such movement,
the portion of the web extending on rollers p, p, p, p, w¹, will be kept at rest.
But during the same period roller V1 is likewise shifted towards the left adistance of n/4,
and a length of paper of n/2 will be released by roller V1 and by the loop continuously
decreasing by such movement, .that is to say, just the same length of paper has to be
delivered in the meantime by the delivery cylinders 84, 85. Therefore, during the left
hand stroke of levers X; the portion of the web extending from roller p to roller wol is
kept stationary, the web being uniformly fed from the left and uniformly delivered at
the right.
•
If then levers X are rocked towards the right, rollers V, V₁, and bars U during
the following quarter of revolution of wheel ƒ are shifted towards the right a dis-
tance of n/. Thereby during that period, roller V1 would take up by the loop con-
tinuously increasing a length of paper of n/2, whilst simultaneously a length
of paper of n/ will be delivered by the delivery cylinders.
If therefore, tearing and breaking of the web should be prevented on the portion
extending to roller w¹, a length of paper of n should be released in the meantime.
But, indeed, this will be the case. For the roller V shifted during that period
towards the right a distance of n/ releases by the continuously decreasing loop a
length of paper of n/2, whilst the same length of 1/2 is simultaneously fed from roll O.
The above described device therefore works as intended, as, first, during each half
of a revolution of wheel ƒ a length of paper of n will be fed and delivered, and
second, the shifting of the web is performed intermittently, the portion of the
paper to be worked remaining stationary during one quarter of revolution of wheel f,
and being shifted during the following quarter of its revolution.
The essential features of my invention consist in uniformly feeding and delivering
the endless web, in intermittently stopping a portion thereof by a suitable horizontal
reciprocating movement of the bars U and the guide rollers V, V₁, and in driving the
said bars by means of rock levers X and a cam-actuated rod b. But I do not limit my
invention to any special means for connecting the rock levers with the reciprocating
bars. These means may consist in gearings engaging with racks, as represented in
and described with reference to Figure 1, or in links g, as shown in Figure 2, pivotally
connected to the levers and the bars, or in directly pivotting the levers to the bars, as
appearing from Figure 3. In the latter case, the bars are pivotted at the other end
to another pair of levers X1 swinging on studs Y¹, the guides L, L1, L2 being dis-
pensed with.

page_text: 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. In a device for intermittently stopping and shifting a portion of an endless web
of paper or another material uniformly fed at one end and likewise uniformly delivered
at the other end, the said portion extending between the feeding point and between
the delivery point, the combination of a system of horizontally reciprocating bars U
provided with guide rollers V, VI, for the web, a system of rocking levers X connected
to or engaging with the said bars, and a cam actuated rod-and-lever connection b, Z,
for imparting a swinging movement to the rocking levers, the bars U being either
guided in guide plates L, 11, 12, Figures 12, or arranged to swing freely by means
of additional swinging levers X', Figure 3.
2. A feature of the device claimed under Claim 1, for varying the shifting stroke
of the web portion to be intermittently stopped and shifted, which consists in adjust-
ably arranging the rod-and-lever connection b, Z.
3. A form of the feature claimed under Claim 2, which consists in adjusting the
connecting pin a of the rod-and-lever-connection 6, Z, by means of a slot provided in
the lever Z and a screw bolt / extending lengthwise through the said slot and passing
through the connecting pin.