Improvements in Rotary Letter-press Printing Machinery.
Year: 1893

page_text: Date of Application, 18th Feb., 1893-Accepted, 1st Apr., 1893
COMPLETE SPECIFICATION..
Improvements in Rotary Letter-press Printing Machinery.
I, FRANZ XAVER HÖLZLE, of Eisbachstrasse, 2/1 Heidelberg, in the Empire of
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:-
Letter press printing machinery at present in use may, for the purposes of this
description, be divided into two classes, namely those in which a flat or plane
printing surface is employed, and those which possess a cylindrical printing
surface. The first mentioned class of machines although they render clear
impressions have the disadvantage of being slow in their operation. Cylindrical
printing machinery on the other hand, possess the quality of speed, but necessitate
the use of curved stereotyped printing surfaces, which are at once expensive in
their production and open to objection as regards the impressions which they
render.
In a printing machine constructed according to my invention there is employed
a flat printing surface with a rotary action, whereby good impressions are obtained
with high speed, the machine being at the same time simple in its construction and
capable of being cheaply produced.
In the drawings hereto annexed, Figures 1 and 2 represent end and side
elevations respectively of my improved printing machine, Figure 3 being a
sectional elevation; and Figures 4, 5, and 6 detail views of the principal parts.
Upon reference to the drawings, it will be seen that a designates the main frame
of the machine; c the printing table, mounted upon the shaft 6 driven by the
belt wheel & through the pinion and spur wheel g. The impression cylinder m is
carried by the axle k, whose bearings i have vertical play in guides h formed in the
The ends of the axle are provided with rollers n which work in
channels p formed in the revolving radial arms e of the table c.
frame a.
The printing table c is provided with a surface plate c¹ (capable of adjust-
ment vertically by means of the set screws u) upon which the chase of
printing type t is laid. To the ends of the table c is attached the arched
plate, whose surface comes in contact with and receives from the roller w
of the ink feeding device Z, and in turn transfers such ink to the spring retained
inking rollers
and y.
V, X,
The ink distributing surface c³ is prevented from coming
into contact with the paper upon the surface of the impression cylinder m by
means of the rims q raised upon both parts. Upon one end of the table c is
formed the segmental spur wheels which gears with the spur wheel of the
impression cylinder m.
Tapes carried by the rollers z conduct the paper to be printed upon from
the source of supply to the cylinder m and return it to the delivery table in the
usual manner.
In operation (the printing table being in the position shewn in Figure 6) upon
motion being imparted to the wheel d the table c is caused to revolve in the
direction of the arrow.
and
The printing type receive ink from the rollers y
and then pass under the paper carried by the pressing roller m. During this
action the channels p of the arms e enclose the rollers n of the axle k and draw
down the impression cylinder m and the paper carried thereby onto the surface
of the type t, the flattened portion of the segmental spur wheels coinciding with
and enabling this movement to be accomplished. As the table c revolves, the
surface c³ takes ink from the roller w and spreads it upon the rollers v, x,
It will thus be seen that a continuous rotary action is obtained with the use of a
Alat printing surface.
and y.

page_text: 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. A rotary letter press printing machine comprising a plane printing table
mounted upon an axis, a circumferential ink distributing device, and radial arms
adapted to engage with the journals of the impression cylinder; constructed and
operating substantially as herein described.
2. In a rotary letter press printing machine of the type herein described, the
use of projecting rims upon the surfaces of the impression cylinder and
circumferential ink distributing device, for the purpose described.
1002
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.