Improvements in Web Printing Machines.
Year: 1892

page_text: Date of Application, 3rd Feb., 1892
Complete Specification Left, 28th Oct., 1892-4ccepted, 10th Dec., 1992
PROVISIONAL SPECIFICATION.
Improvements in Web Printing Machines.
I, ROBERT CUMMING ANNAND of Cornwallis Street, South Shields in the
County of Durham, Printer and Publisher do hereby declare the nature of this
invention to be as follows:-
It is found in practice that when the cylinders of web printing machines exceed
a certain length and are driven at fast speeds considerable vibration is produced by
the edges at the margin gaps of the plates on the stereo or forme cylinder striking
against the blanket cylinder. The object of my invention is to overcome this
objection and with this object I employ a bearer preferably in the form of a ridge
or metal ring around the stereo or forme cylinder as near the middle as practicable
the height or thickness of this ridge or ring being the same as that of the stereo
plates. I also form a corresponding bearer ridge or ring around the blanket
cylinder of a height or thickness equal to that of the blanketting. These two
ridges or rings are in continuous rolling contact with each other and when the gaps
come round they prevent the cylinders coming closer together and consequently the
vibration due to the cause hereinbefore explained is obviated. The ring on either or
both of the cylinders may be made of a slightly yielding material such for instance
as leather or india rubber.
These rings or ridges can be employed on the cylinders of machines where two or
more webs are used the rings coming between the webs. They can also be used in
machines where the web is put through between the cylinders and printed on one
side and then passed round turning bars and entered between the same cylinders to
be printed on the other side the rings or ridges being placed between the two sets
of formes.
Instead of complete rings or ridges extending all round the cylinders I can employ
bearers in the form of segments of rings in line with the margin gaps.
Dated this 3rd day of February 1892.
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.
COMPLETE SPECIFICATION.
Improvements in Web Printing Machines.
I, ROBERT CUMMING ANNAND of Cornwallis Street, South Shields in the
County of Durham, Printer and Publisher, 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 :-
It is found in practice that when the cylinders of web printing machines exceed
a certain length and are driven at fast speeds considerable vibration is produced by
the edges at the margin gaps of the plates on the stereo or forme cylinder striking
against the blanket cylinder. The object of my invention is to overcome this
objection and with this object I employ a bearer preferably in the form of a ridge
or metal ring around the stereo or forme cylinder as near the middle as practicable,
the height or thickness of this ridge or ring being the same as that of the stereo
plates. I also form a corresponding bearer ridge or ring around the blanket
cylinder of a height or thickness equal to that of the blanketting. These two
ridges or rings are in continuous rolling contact with each other and when the gaps
on the stereo cylinder come round to the blanket cylinder the ridges or rings

page_text: prevent the cylinders coming closer together and consequently the vibration due to
the cause herein before explained is obviated.
The accompanying drawings will make my invention fully understood.
Figure 1 represents in plan a portion of a stereo or forme cylinder and of a
blanket cylinder which are constructed according to my invention.
Figure 2 is a section on the line x x of Figure 1.
a is the stereo cylinder, 6b the stereo plates fixed thereon in the usual way,
and c is the blanket cylinder. d and e are the bearers which according to my
invention I employ on the cylinders a and c respectively. The bearers shown in
Figures 1 and 2 are in the form of rings which are preferably cast with their
respective cylinders. The periphery of the bearer or ring d should be level with
the face of the stereo plates 6 b, and the bearer or ring e should be about one eighth
of an inch thick.
The bearers or rings or ridges can be employed on the cylinders of machines
where two or more webs are used, the rings coming between the webs. They can
also be used in machines where the web is put through between the cylinders and
printed on one side and then passed round turning bars and entered between the
same cylinders to be printed on the other side, the rings or ridges being placed
between the two sets of formes.
Instead of complete rings or ridges extending all round the cylinders I can employ
bearers in the form of segments of rings, those on the stereo cylinder being in line
with the margin gaps. This modification is represented in transverse section in
Figure 3 in which d d represent the bearers opposite the margin gaps on the
cylinder a, and e e the corresponding bearers on the cylinder c. Ör the segmental
bearers as in Figure 3 may be on the cylinder a only, while the bearer on the
cylinder c is a complete ring as in Figures 1 and 2.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The addition to the stereo or forme cylinders and blanket cylinders of web
printing machines of bearers arranged so that a bearer on the stereo cylinder shall
be in contact with a bearer on the blanket cylinder whenever a margin gap on the
stereo cylinder comes round to the blanket cylinder, substantially as and for the
purpose hereinbefore described.
Dated this 25th day of October 1892.
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Chartered Patent Agent.