Improvements in Lithographic Machines.
Year: 1898

page_text: · Date of Application, 5th Oct., 1893-Accepted, 31st Dec., 1898
COMPLETE SPECIFICATION.
Improvements in Lithographic Machines.
We, JAMES CHRISTOPHER HALLIGAN and JAMES FERGUSON, both of Queen Street,
Brisbane, in the Colony of Queensland, Lithographic Printers, 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:
Our invention relates to improvements to certain parts of lithographic machines
and consists in a novel arrangement of working the ink duct and bringing the
same under the control of the operator at the front of the machine: providing
the printing roller with a disc whereby the printing roller is always arrested at
the same spot on each stroke of the machine; and lengthening the damping
roller lifter sufficiently for the lower end to work through a hole in the side frame
of the machine thus keeping it in a perpendicular position and preventing
breakage so frequent in the lifters now employed.
Referring to the drawings:-
Fig. 1 is a side elevation of the machine showing the positions of the parts
to which our invention relates.
Fig. 2 broken side elevation of machine with enlarged detail of ink duct gear
and with inking roller released from inking slab.
Fig. 3 enlarged detail of ink duct gear with roller in contact with inking slab.
Fig. 4 enlarged detail of printing cylinder disc, tension spring and friction
wheel and support.
Fig. 5 is an enlarged detail view of the damper lifter and some of the adjacent
parts.
Reference letters indicate like parts in all figures.
A is a trough supported by brackets H at the end of the machine for receiving
the printing ink, B a roller fixed between the extended sides of the trough and
forming the front edge, on to the spindle of one end of this roller is secured a
ratchet wheel C and a lever D with pawl D¹, the ratchet wheel is made a fixture
to the spindle, the lever working on the spindle and the pawl engaging with the
teeth of the ratchet wheel. E is a spring connected to the lever D and the
supporting bracket. F is the inking roller supported by links G one of which
is only seen as one side only of the machine is shewn, these links are pivotted
at one end on to the brackets H. J is a lever with turned head and sloping
end, K is a stud secured to the lever. L is a connecting rod pivotted to the end
of the lever J, and to the eccentric which actuates the printing cylinder. Attached
to the lever D is a cord N the other end of which is fastened to the feed board
to enable the operator to put the same out of gear.
O is a metal disc secured to one end of printing roller and O¹ a friction wheel
revolving in bracket P secured to side frame, this bracket has a spring tendency,
the friction wheel impinges with the periphery of the dise wheel, a circular notch
is cut out of the periphery of the disc wheel with which the friction wheel engages
on each stroke of the machine, thereby arresting the printing roller always at the
same spot. Q is a tension spring connected at one end to the side frame of the

page_text: machine and at the other end to stud q on disc 0. R is the damper lifter, the
extended end of which is inserted in a hole in the side frame of the machine
to insure its always assuming a vertical position. S is the lifting bar but this
forms no part of our invention.
When the ink duct mechanism is in gear the inking roller falls on to the inking
slab as the same is propelled towards it, by sliding down the sloping end of
lever J see Fig. 3 and as the inking slab recedes the lever J being connected
by rod L to the eccentric Mf raises the inking roller and presses same against
the ink duct roller; and as the lever J moves backwards and forwards the stud K
contacts with the lever D) and the pawl D' connected therewith engages with
the ratchet B which thus revolves the ink duct roller. When the lever Dis
pulled forward by cord N it frees the same from contact with stud K or lever J
and the ink duct roller remains at rest.
The wheel O fixed to end of printing cylinder revolves with same when at
work, at each stroke of the machine the tension spring Q pulls the disc wheel O
down and the friction wheel 01 engaging with the circular notch in the disc
wheel immediately arrests it insuring the printing cylinder stopping exactly
at the same spot at each revolution.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:
1. In a lithographic machine, the lever J and connecting rod L in combination
with the lever D, pawl D', and ratchet wheel B as and for the purpose set forth
and as herein described and illustrated by drawings.
2. In a lithographic machine, the disc wheel O in combination with friction
wheel 0, support P stud q and tension spring Q as and for the purpose set forth
and as herein described and illustrated by drawings.
3. In a lithographic machine, the damping roller lifter R with extended end r
inserted in hole in side frame as herein described and illustrated by drawings.
4. In a lithographic machine, the cord N connected to lever ID and feeding
board as and for the purpose set forth and as herein described and illustrated
by drawings.
Dated this 5th day of October 1898
D. YOUNG & Co.,
11 & 12, Southampton Buildings, London, W.C.,
Agents for the Applicants.