AN IMPROVEMENT IN CYLINDER PRINTING MACHINES
Year: 1884

page_text: I, ADAM PATON, of Leeds in the county of York, Engineer, do hereby declare
the nature of my invention for "AN IMPROVEMENT IN CYLINDER PRINTING
MACHINES" to be as follows:-
Printing machines have been made and used in which an impression cylinder
carrying the sheet held to it at one edge by grippers, is mado to reciprocate, and is
mounted in eccentric bearings which are turned partly round so that in the back-
stroke, the cylinder is raised clear from the surface of the forme. It is to machines
of this kind, whether for letter-press or for lithographic printing, that my invention
applies. To each of the eccentric bosses which form the bearings for the axis of the
cylinder, I affix an arm and on each end of the cylinder I fix a stud, the arm and
stud being so arranged that, as the cylinder is completing its stroke in each
direction, the stud moves the arm through a certain angle, and so turns partly
round the eccentric boss to which the arin is affixed, thereby lowering the cylinder
to give the impression during its forward stroke, and raising the cylinder to be
clear of the forme during its back stroke. Over the cylinder, I place an inclined
feed board in front of which is arranged a frame presenting a set of hooked stops
which receive the front edge of the fed sheet and hold it ready to be.caught by
the grippers. The grippers moving through the spaces between the stops, catch
the edge of the sheet and by means of shoulders projecting inwardly from them,
raise it a little, so as to be clear of the hooks, and then grasp it to the cylinder, by
which it is carried round while the forine on the sliding table below (which has a
rack geared to a wheel on the cylinder) travels with it. On the side of the
cylinder opposite to that at which the sheet is fed, I provide a pulley from which
the cylinder is clear when it is down giving the impression, but against which the
cylinder bears when it is raised for its backstroke, with sufficient pressure to cause
the pulley to revolve. This pulley bearing also against one of a pair of band
rollers, causes them also to revolve in the same direction as that in which the
cylinder is then moving. A set of spring scrapers bearing against the surface of
the cylinder, catch the hinder edge of the sheet, as the cylinder makes its back

page_text: stroke, and guide it on to tapes or bands, travelling with the rollers above
mentioned, and the grippers being at this time released, the printed sheet is carried
away by these tapes or bands, and delivered where required.
Sometimes it is of advantage to work the machine for a time without printing,
so as to get the table and rollers inked.
In order that this may be done, I provide a spring hook, which engages the arms
affixed to the eccentric bosses, the spring acting on this hook, so as to restore the
cylinder to its elevated position as the stud that moved the arm retreats from it.
ABEL & IMRÀY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.

page_text: COMPLETE SPECIFICATION.
I, ADAM PATON of Leeds, in the county of York, Engineer, do hereby declare
the nature of my invention for "AN IMPROVEMENT IN CYLINDER PRINTING
MACHINES" and in what manner the same is to be performed to be particularly.
described and ascertained in and by the following statement:
J
Printing machines have been made and used in which an impression cylinder
carrying the sheet held to it at one edge by grippers is made to reciprocato, and is":
mounted in eccentric bearings which are turned partly round so that in the back-
stroke, the cylinder is raised clear from the surface of the forme. It is to machines;
of this kind, whether for letter-press or for lithographic printing that my invention
applies. To each of the eccentric bosses which form the boarings for the axis of the.
cylinder, I affix an arm, and on each end of the cylinder I fix a stud, the arm and
stud being so arranged that as the cylinder is completing its stroke in each
direction, the stud moves the arm; through a certain angle, and so turns partly
round the eccentric boss to which the arm is affixed, thereby lowering the cylinder
to give the impression during its forward stroke and raising the cylinder to be
clear of the forme during its back stroke. Over the cylinder I place an inclined
feed board in front of which is arranged a cross frame presenting a set of hooked
stops which receive the front edge of the fed sheet and hold it ready to be caught
by the grippers. The grippers moving through the spaces between the stops, catch
the edge of the sheet and by means of shoulders projecting inwardly from them,
raise it a little so as to be clear of the hooks and then grasp it to the cylinder by
which it is carried round while the forme on the sliding table below, which has a
rack geared to a wheel on the cylinder, travels with it. On the side of the
cylinder opposite to that where the sheet is fed, I provide a pulloy from which the
cylinder is clear when it is down giving the impression, but against which the
cylinder bears when it is raised for its backstroke, with sufficient pressure to cause
the pulley to revolve. This pulley bearing also against one of a pair of band
rollers, causes them also to revolve in the same direction as that in which tho
cylinder is then moving. A set of spring scrapers bearing against the surface of
the cylinder, catch the hinder edge of the sheet as the cylinder makes its back-
stroke, and guide it on to tapes or bands travelling with the rollers above
mentioned, and the grippers being at this time released, the printed sheet is carried
away by these tapes or bands and delivered where required.
Sometimes it is of advantage to work the machine for a time without printing
so as to get the table and rollers inked.
In order that this may be done, I provide a spring hook which engages the arms
affixed to the eccentric bosses, the spring acting on this hook so as to restore the
cylinder to its elevated position as the stud that inoved the arm retreats from it.
The accompanying drawing shews an end view of the printing cylinder with my
invention applied thereto. S is the stud on the end of the cylinder which acting
on the arm A of the eccentric bearing turns the bearing partly round, thereby
elevating the cylinder to the dotted position during the return of the table and
depressing it to give the impression. To the arm A, I connect by a link a spring
lover L, which elevates the cylinder when the stud S leaves the upper side of the

page_text: arm A. This spring action is however rendered inert during the regular printing
by turning the handle H so as to release the spring. T is the feed table below the
slope of which I provide hooks C to receive the edge of the fed sheet. When the
opened grippers & come up between the hooks C to engage the edge of the sheet
they by means of the shoulders g lift the sheet clear of the hooks C. On the
delivery side of the cylinder, I mount a friction pulley D, which is clear from the
periphery of the cylinder when the cylinder is depressed, but when the cylinder is
elevated as indicated by the dotted lines, it, by contact with D, drives it during its
return stroke, and this puts in motion the travelling tapes E which, moving in the
direction of the arrows, carry off the delivered sheet, which is stripped from the
cylinder by the spring scrapers K.
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 in respect of cylinder printing machines is
1, Effecting the raising and lowering of the cylinder by studs thereon acting
on arms of the eccentric bearings of the cylinder axis, substantially as herein
described.
2, Elevating the cylinder when required by means of a spring acting on the
arms of the eccentric cylinder bearings, as and for the purpose herein set forth.
3, In combination with hooks C receiving the edge of the fed sheet, shouldered
grippers G operating as herein described.
'
4, In combination with a friction pulley D, the scrapers K and travelling tapes E
for delivery of the printed sheets, substantially as described.
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