Improvements in and relating to Platen Printing Machines.
Year: 1897

page_text: Date of Application, 18th June, 1897
Complete Specification Left, 18th Mar., 1898-Accepted, 28th May,
1898
Improvements in and relating to Platen Printing Machines.
HENRY ERNEST NEWSTEAD, of Egypt Road, Nottingham, Printer's Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in and relating to platen printing
machines and has for its object the provision of means for positively rotating the
ink duct cylinder when the distributing roller is in contact with the same, whether
the impression be
off" or
"on"; also improvements in the construction of the
ink duct whereby the supply of ink may be regulated, stopped or supplied to any
part of the ink duct cylinder, and means by which the ink duct cylinder may be
raised for cleaning and other purposes.
In machines of the kind herein referred to the distributing roller is in contact
with the ink duct cylinder at the time the impression is being taken, and the back
shaft of the machine carried by the type bed, has a partial rotation at the same
time. Now according to this invention the back shaft is fitted with a cam, and
during the partial rotation of the shaft this cam actuates the ink duct cylinder
through ratchet mechanism on the same and suitable connections, means being
provided for regulating the amount of motion given to the ink duct cylinder.
When the impression is thrown "off" the back shaft has no movement of rotation
and the ink duct cylinder is then rotated from the impression rod. This may be
done by a lever which is carried by the type bed and connected to the ink duct
cylinder ratchet mechanism, the said lever being moved into position to be acted
upon by the impression rod, or, there may be a cam or incline on the impression
rod which is brought into action when the impression rod is turned to "throw off"
the impression. There is also a slide or lever carried by the type bed and so
arranged that when the impression is off it comes into contact with the cam or
incline and actuates the ink duct cylinder ratchet mechanism through suitable
connections.
This invention also relates to improvements in the construction of the ink duct.
The cylinder bearings, instead of being fixed are mounted on axles so that the
cylinder can be raised, and means are provided for holding the cylinder in any
position. There is also a spring ink duct knife which may be pressed upon the
cylinder by adjusting screws to stop or regulate the supply of ink to the same, or
the knife may be pressed upon the cylinder at one or more parts and the ink supply
stopped at those parts.
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page_text: Improvements in and relating to Platen Printing Machines.
HENRY ERNEST NEWSTEAD, of Egypt Road, Nottingham, Printer's Engineer,
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:-
This invention relates to improvements in and applicable to platen printing
machines, and has for its object the provision of means for positively rotating the
ink duct cylinder when the machine is actually printing and at the time the ink
distributing roller is in contact with the cylinder; also means whereby the supply
of ink may be regulated, stopped or supplied to the whole or any part of the ink
duct cylinder; and, also, means by which the ink duct cylinder can be raised
for cleaning and other purposes.
In machines of the kind herein referred to the ink distributing roller is in
contact with the ink duct cylinder, and the back shaft is partially. rotated at the
time the impression is being taken.:
According to this invention the type bed back shaft is fitted with a cam or
projection, and during the partially rotation of the shaft the cam or projection on
it actuates the ink duct cylinder through ratchet mechanism and suitable con-
nections, means being provided whereby the amount of motion given to the
cylinder may be varied. The ink duct cylinder bearings are mounted on fixed
axles to allow of the cylinder being raised for cleaning and other purposes, and
the ink duct is provided with a spring knife and screws by which the supply of
ink to the whole or any part of the cylinder may be stopped or regulated.
In the accompanying drawings
Fig. 1 is a side elevation of a printing machine showing the general arrange-
ment of the improvements herein referred to,
Fig. 2 is a side elevation of part of a machine showing to an enlarged scale the
improved mechanisms, and
Fig. 3 is a part plan of the improved ink duct.
In the machine selected to illustrate the application of this invention the type
bed a with its attached parts is fitted to oscillate upon an axle al and is moved to
and fro by side links a² from cranks 3. The type bed is fitted with a back shaft b
which is eccentric to the ends fitting the links a² and is partially rotated for each
impression by an arm b₁ which comes into contact with the impression rod 62
when this is given a quarter turn from the position shown. The shaft b is also
provided with a pin and is turned back to its original position by the roller side
arm c, the boss of which is cut to work in conjunction with the pin in the shaft.
The ink plate d and inking rollers c¹ are mounted and actuated in the usual
manner while the ink distributing roller e is carried by links e¹ from levers e² on
a shaft which is fitted with a lever and actuated by a cam et on one of the side
arms c, a spring es being used for holding down the roller e.
The ink duct cylinder f according to this invention has its bearings in
brackets f¹ which are mounted on fixed axle f2 and held in their normal or working
position by screws f³, this arrangement allowing of the cylinder being turned to
the position shown by dotted lines for cleaning or other purposes without altering
the position of the knife. On the top of each bracket f¹ there is a spring catch f
which is arranged to hold the cylinder in its out of work position. The ink duct
comprises a casing g which is firmly secured to the arms g¹ and is fitted with side
plates g and with a thin spring knife ³ which is rigidly connected at its outer
edge to the casing 9 while its inner edge is pressed upon the cylinder f by adjust-
ing screws which are placed at comparatively short distances from each other

page_text: and may be so connected to the free edge of the knife that this edge may be bent
by the screws in either direction.
When the impression is about to be taken, the ink distributing roller e is in
contact with the ink duct cylinder f', and the arm b¹ coming into contact with the
impression rod commences to turn the shaft b, and through a projection piece h
actuates the lever h¹ which is held in contact with the piece h by a spring h².
The lever h¹ oscillates on the shaft and by the link 3 actuates a lever h which
is mounted on the ink duct cylinder shaft f. The lever his fitted with a ratchet
pawl h³ and intermittently rotates the cylinder f³ through a ratchet wheel fo. In
the arrangement shown the lever h may be worked by hand to rotate the cylinder f
if required and it is made with a slot h to allow of a variation in the motion given
to the cylinder. The lever h¹ may be operated by a cam instead of the piece h¹ on
the shaft b.
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 combination with a platen printing machine of an ink duct in which the
cylinder is carried by bearings capable of turning on fixed axles, is actuated by
ratchet mechanism, and in which the supply of ink is regulated by a spring knife
constructed arranged and operating substantially as herein described with
reference to the accompanying drawings.
Dated this 17th day of Norch 1808