A Stop Cylinder Printing Press with Continuously Revolving Form Cylinder and Front Delivery
Year: 1899

page_text: Date of Application, 20th Mar., 1899-Accepted, 17th June, 1899
A Stop Cylinder Printing Press with Continuously Revolving Form
Cylinder and Front Delivery,
11
I, AMBROS BOHN, of Würzburg, Germany, Manufacturer, 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 a novel feature of a stop cylinder printing press, in
which an intermittently revolving impression cylinder coacts with a continuously
revolving form or plate cylinder, and the sheets are delivered at the front end of
the machine printed side up, the feed table being placed lowly, namely in level
with the delivery table. The object of my invention is to increase at the same
time the quantity and quality of work, the continuously revolving cylinder allow-
ing of a large speed of the press, the intermittently stopped impression cylinder
securing a perfect register in feeding the sheets, the visibility of the print of the
delivered sheets facilitating the control of the ink fountain, and the low position
of the feed table affording facility and quickness in feeding the sheets.
The accompanying drawing is a diagrammatical view of my invention.
The continuously revolving form cylinder 1 is driven by pinion 2 fixed on
main driving shaft and engaging with a gear wheel on the cylinder shaft. From
pinion 2 motion is imparted to the drum or cylinder 4 by an intermediate pinion 5
engaging with pinion 2 and with a gear wheel on the drum shaft, drum or
cylinder 4 serving the purpose of delivering the sheets to the delivery tapes.
Cylinder 4 is connected by a gear to the transfer cylinder 6, which receives the
printed sheet from the impression cylinder and transfers the same to drum or
cylinder 4. The impression cylinder 7 is connected by a gear to the form
cylinder 1, this gear, as usual in stop cylinder presses, having some teeth mutilated
or cut away and a forked lever arm 12 and a pin 121 of the cylinder serving the
purpose of timely bringing impression cylinder 7 into engagement with form
cylinder 1 and of intercepting and stopping the same at the end of cach revolution,
as well known in stop cylinder printing presses.
A suitable swinging movement is imparted to lever arm 12 by means of two
cams 8, 9 mounted on the shaft of the form cylinder and a slide 10 bearing with
rollers against the cam edges and pivoted to a lever 11 which is firmly connected
to lever arm 12.
Drum 4 and transfer cylinder 6 perform two revolutions at each revolution of
the form cylinder 1, whilst impression cylinder 7 during half a revolution of
cylinder 1 performs a complete revolution and is then kept stopped in order to
allow of presenting the sheet to cylinder 7 in a perfect registering condition.
Cylinders 7, 6 and drum 4 are provided with grippers meeting each other in
the lines of contact between cylinders 6 and 7 and cylinder 6 and drum 4 respec-
tively.
In lieu of the transfer cylinder 6, transfer disks or a transfer reel can be made
use of, in order to prevent offset.

page_text: Delivery tapes 13 pass on drum 4, and another set of tapes 14 may be provided
to coact with tapes 13 if required.
My invention works as follows:-
The sheet fed on the feed table to the grippers of the impression cylinder is
grasped by the same and printed when passing between cylinder 7 and the
printing plate 15 of the form cylinder. In the present instance the printing
plate is supposed to consist of a zinc plate fixed on the printing portion of
cylinder 1, as my press is applicable to any material to be printed upon, in
lithographic as well as in typographic and other printing, a suitable inking device
and, as the case may be, a dampening apparatus only being to be connected
therewith. As the grippers of cylinders 7 and meet each other, the former
open and the latter close, and the sheet is then carried on by the transfer cylinder 6,
until the grippers of the latter and those of drum 4 meet each other. In this
position, the grippers of cylinder 6 open and those of drum close, and the sheet
is taken along with by the drum, until the grippers of the latter open again to
deliver the sheet to the delivery tapes 13, 14, by means of which it will be carried
to and discharged on the delivery table 16. In the meantime, during the passage
of portion 17 of the form cylinder above the impression cylinder, which has
been kept stopped during that period, a fresh sheet has been fed to be printed,
transferred and delivered as described, and so on.
In order to afford facility in feeding when using my invention for printing
on card board, tin plates, sheet metal and the like, the feed table 18 may be
arranged movable and provided with a lifting device for lifting the same according
as the pile 19 of the material to be fed decreases by feeding the same, so as to
always keep the uppermost sheet or plate flush with the stationary feed board 20
and to forward it to the impression cylinder by a simple shifting movement.
To this purpose the table 18 is supported by rods 22, which are guided in
arms 23 of the frame work, and loosely connected by links 24 to levers 25, which
are mounted on a shaft 26 journaled in the frame work. A toothed segment 27
is fixed to shaft 26 and engages with a screw wheel 28 journaled in the frame
work, and driven by a pair of bevel wheels 29, 30. The latter is connected to a
ratchet wheel 31, and a step by step movement imparted to wheel 31 and screw
wheel 28 by a lever 32 engaging with wheel 31 by a pawl 33. Lever 32 is recip-
rocated by a rod 34 pivotally connected to a crank arm 35 of the impression
cylinder shaft 36. The crank is slotted, so as to allow of adjusting the end of
rod 34 within the crank slot, in order to control the stroke of lever 32 and the
corresponding upwards movement of table 18, taking place at each revolution of
the impression cylinder, in accordance with the thickness of the paper or other
material to be printed upon. This upwards movement of the table conn be further
controlled by likewise providing lever 32 with a slot as shown and adjusting
therein the connecting end of rod 34. Table 18 is lowered again by actuating a
crank 37 mounted on the shaft of the screw wheel and at the same time disen-
gaging ratchet wheel 31 from pawl 33.
Having now particularly described and accertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
-
1. In a printing press the combination of a continuously revolving form or plate
cylinder, an intermittently revolving impression cylinder coacting therewith and
temporarily engaging with the form cylinder, a continuously revolving sheet
delivery drum engaging with the form cylinder, a sheet transfer cylinder en-
gaging with the sheet delivery drum, and means for controlling the engagement
of the impression cylinder with the form cylinder and timely disengaging both
cylinders from each other and stopping the impression cylinder, substantially as
and for the purposes described.
2. A feature of the printing press claimed under Claim 1, consisting in that the
sheet transfer cylinder is placed heneath the form cylinder, and the impression

page_text: cylinder and the sheet delivery drum symmetrically arranged with respect to the
sheet transfer cylinder, the impression cylinder, the sheet transfer cylinder and
the sheet delivery drum being each of the same size, viz. half size of the form
cylinder, and the latter carrying on one half of its surface the printing form or
plate, the other half of its surface serving the purpose of an ink distributing table,
substantially as and for the purposes described.
3. A feature of the printing press claimed under Claims 1 and 2, consisting in
that the feed table is lowly placed, viz. in level with the delivery table, substan-
tially as and for the purposes described.
4. A feature of the printing press claimed under Claims 1, 2 and 3, consisting
in that the feed table is movably arranged and step by step lifted with the sheets
or other material to be printed upon according as the pile decreases by feeding,
in order to always keep the uppermost sheet Hush with the feed board, substan-
tially as and for the purposes described.
5. A lifting device for successively lifting the feed table as claimed under
Claim 3, consisting of the combination of a ratchet wheel, a screw wheel controlled
by the same, a toothed segment engaging with the screw wheel, levers mounted
on the shaft of the said segment and pivotally connected by rods to the feed
table, means for guiding the latter, and means for actuating the ratchet wheel
at each revolution of the impression cylinder, substantially as and for the purposes
described.
Dated this 20th day of March 1899.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Ambros Bohn.