Improvements in or connected with the Gripper Mechanism of Tin Plate and like Lithographic Printing Machines.
Year: 1896

page_text: Date of Application, 20th Oct., 1896
Complete Specification Left, 19th July, 1897-Accepted, 28th Aug., 1897
VIDIONAL SPECIFIC
TION.
Improvements in or connected with the Gripper Mechanism of Tin
Plate and like Lithographic Printing Machines.
We, CHARLES POLLARD, and GEORGE BRAYSHAW, both of the Firm of George
Mann and Company, Elland Road Works, Leeds, in the County of York, Printing
Machine Makers, do hereby declare the nature of this invention to be as follows:-
The object of our invention, is to arrange the gripper mechanism of tin plate
and like lithographic printing machines, in such a manner that the gripper is
opened and held open during the whole of the time the cylinders are at rest.
According to our invention, we provide a segment which is rocked on its centre
by a cam, lever or other suitable means, and on the face of the said segment we
form an indentation or slot. On the end of the impression cylinder we provide a .
rocking wheel, which is provided with a cam for actuating the roller of the gripper
mechanism, and the said cam is formed in two overlaping parts so that it may be
adjusted in size to regulate the distance of action of the gripper; and the said
rocking wheel is also provided with a connecting rod which carries a hinged piece
at its lower end. The hinged piece is connected by means of suitable arms and
springs, with the tripping lever shaft, and the said hinged piece carries a pin or
projection for engaging with the slot in the segment.
On the lever being actuated, the tripping lever shaft is rocked, thus moving the
arms and pressing the spring aginst the spring piece, and this action brings the
pin on the hinged piece against the surface of the segment. On the segment
arriving at the required position, the pin enters the slot and connects the segment
to the rocking wheel, thus throwing the gripper mechanism into action. When
it is required to stop the cylinders, the tripping mechanism is actuated in the
ordinary way and the rocking of the tripping lever shaft withdraws the pin from
the slot in the segment thus disengaging the rocking wheel from the segment.
Consequently, as the table reciprocates, the gripper is held open and remains out
of action until the tripping mechanism again starts the cylinders.
Dated this 20th day of October AD 1806
BREWER & SON,
London and Leeds, Agents for the Applicants.
connected with the Gripper Mechanism of Tin
Plate and like Lithographic Printing Machines.
We, CHARLES POLLARD, and GEORGE BRAYSHAW, both of the Firm of George
Mann and Company, Elland Road Works, Leeds, in the County of York, Printing
[Price 8d.1

page_text: Machine Makers, 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:
The object of our invention, is to arrange the gripper mechanism of tin plate
and like lithographic printing machines, in such a manner that the grippers are
opened and held open during the whole of the time the cylinders are at rest.
In order that our invention may be clearly understood, we will proceed to
describe same with reference to the accompanying drawing, in which the letters
refer to various parts of the mechanism.
A is a segment having an indentation G formed in its face, and the said
segment A is provided with an arm A' and is mounted on a shaft or pin B. C is
a connecting rod which is jointed to the arm A, and the opposite end of the
connecting rod C carries a friction roller D which works against a cam E carried
on the main shaft F of the machine. H is a rocking wheel which is situated at
the end of the impression cylinder, and J is a cam the size of which may be altered
by means of the movable segment K. The cam J and movable segment K are
recessed at J and K, and the distance between these recesses may be adjusted by
means of the segment K. L is the roller of the gripping mechanism, and when it
is kept up in the position shewn in the drawing, the grippers are kept open so long
as the wheel H remains in its normal position. M is a connecting rod fulcrumed
to the wheel H, and its lower end carries a hinged piece N, having a pin or
stud z on same, and the said hinged piece N is held in a back position through the
medium of the arms P and R, and the spring S. T is a spring box, and V is
a wedge piece for pressing the spring box away from a fixed pivot Y. The wedge
piece V is carried on the end of an arm W which is actuated by the tripping
lever shaft X on which it is carried.
When the tripping lever is out of action and the cylinder is at rest, the
mechanism above described is in the position shewn in the drawing, with the
roller L supported on the cam J thus holding the rippers continually open and
not allowing them to be intermittently opened and closed as is now the case when
the cylinders are at rest and the table in motion. The rotation of the main shaft F
rotates the cam E, thus alternately moving the connecting rod C backwards and
forwards, and the movement of the connecting rod C rocks the segment A upon
its fulcrum B. So long as the hinged piece N is in the back position, the rocking
of the segment A does not affect same and no motion is given to the wheel H;
but on the tripping lever being actuated, the arm W is depressed and forces down
the wedge piece V thus compressing the spring in the spring box T and tending to
force the stud Z against the surface of the segment A. On the indentation G
coming in front of the stud Z, the latter enters and thus connects the wheel H to
the segment A through the medium of the hinged piece N and connecting rod M,
and the said wheel H is thus rocked backwards and forwards at the required speed
and with the correct pauses between the movements. On the cylinders being
thrown out of action the rocking of the tripping lever shaft X raises the arm W
and withdraws the wedge piece V from the spring box T, thus allowing the latter
to return to its normal position and withdrawing the stud Z from the segment A.
It will readily be seen that on the return of the parts to their normal positions,
the roller L being continually supported on the cam J, the grippers are held open
and remain out of action until the tripping mechanism again starts the cylinders.
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. The employment of a rocking cam, whereby the grippers of tin plate and like
lithographic machines, are held open during the entire time the cylinders are at
rest, substantially as set forth.
2. The cam J, rocking wheel H, connecting rod M, hinged piece N, carrying

page_text: stud Z, and mechanism whereby the hinged piece is pressed forward on the rocking
of the tripping lever shaft X, in combination with a rocking segment, substantially
as and for the purposes set forth.
3. The wheel H carrying cams J and K, the connecting rod M carrying hinged
piece N and stud Z, and mechanism for pressing the hinged piece forward on the
recking of the tripping lever shaft X, in combination with the segment A having
indentation G therein, connecting rod C, and cam E, substantially as and for the
purposes set forth.
4. The general arrangement, construction, and combination of the various parts,
forming our invention for improvements in or connected with the gripper
mechanism of tin plate and like lithographic printing machines, substantially as
and for the purposes set forth.
BREWER & SON,
London and Leeds, Agents for the Applicants.
BREWER & SON,
London and Leeds, Agents for the Applicants.