Improvements in Platen Printing Machines.
Year: 1890

page_text: Date of Application, 13th Mar., 1890
Complete Specification Left, 13th Dec., 1890-Accepted, 31st Jan.,
1891
PROVISIONAL SPECIFICATION.
Improvements in Platen Printing Machines.
I WILLIAM MACKENZIE of 26 Carver Street, Booth Street, Chorlton-on-
Medlock, Manchester, Printing Material Manufacturer, do hereby declare the
nature of my said invention to be as follows:-
This invention relates to improvements in platen printing machines whereby I
am enabled to print in two colours upon the same printing surface or whereby two
distinct printing operations can be performed alternately.
In carrying out my invention I employ a suitable framework in which form
side grooves at any suitable angle by preference approaching to a vertical line, and
in these grooves I guide up and down the table or base plate upon the face of which
are affixed two separate chases of type, one beneath the other and forming the
printing matter for two distinct printings.
Affixed in a proper position to ink the type in each case are a set of inking
rollers which are caused to revolve by frictional contact with the type one carrying
one colour of ink and the other carrying the other colour of ink whilst a single
platen common to both printing surfaces is provided upon which to place the sheet
of paper to be printed.
In order to impart the required intermittent motion to the table to cause it to
dwell whilst the impression is being made in each colour I employ a cam groove to
which a constant revolving motion is imparted but by means of a jointed connecting
rod (carrying upon its inner face a friction bowl adapted to enter the cam groove)
connected at one end to a fixed centre and at the other to the table cause such
rod to work the table up and down and to dwell twice during each revolution of the
cam groove.
JOHN G. WILSON,
Patent Office, 55, Market Street, Manchester, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Platen Printing Machines,
I WILLIAM MACKENZIE of 26 Carver Street, Booth Street, Chorlton-on-
Medlock, Manchester, Printing Material Manufacturer, do hereby declare the
nature of my said 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 platen printing machines whereby
I am enabled to print in two colours in exact register upon the same printing
sheet or whereby two distinct printing operations can be performed alternately.
On the accompanying drawing
Fig. 1 is a front view (with the inking rollers and platen shewn removed) and
Fig. 2 is a side sectional view of my improved platen printing machine.
In carrying out my invention I employ a suitable framework a on the front of
which I form guide grooves b. b. at any suitable angle (as scen more clearly in
Fig. 3) and in these grooves I guide up and down the table or base plate cupon
the face of which are affixed two separate chases of type d and e one beneath the
other and forming the printing matter for two distinct colours.
Affixed in a proper position to ink the type in each case respectively are a set of
inking rollers and g which are caused to revolve by frictional contact with the
type one carrying one colour of ink and the other carrying the other desired colour

page_text: of ink whilst a single platen common to both printing surfaces is provided upon
which to place the sheet of paper to be printed upon. The lower main inking
roller being by preference driven by an endless chain or band from a pulley k on
the shaft and the upper main inking roller m by a similar chain or band from a
pulley on the axle of the lower main inking roller i. The inking rollers and g
are "timed to advance slightly so as to be in touching contact with and roll over
the type, as it is carried up and down, this being effected by discs or wheels having
a swell or projection f¹ on their rims and affixed at each end of the main inking
rollers mand i as illustrated.
21
And in order to impart the required intermittent motion to the table c to cause it
to dwell whilst the impression is being taken in each colour I employ a special-cam
groove o (shewn separate in Fig. 4) formed in the face of the spur wheel pas
illustrated to which a constant revolving motion is imparted and by means of a
counter-balanced connecting rod carrying upon its inner face at one extremity a
friction bowl adapted to enter the cam groove and at the other extremity
.connected to the table by means of the connecting links and mounted on a fixed
centres cause such rod to work the table up and down and to dwell twice during
each revolution of the cam o and whereby I am enabled to print in two. different
colours and in exact register.
C
It now remains to describe how the several parts are operated.
The spur wheel p is mounted loosely on a sleeve or collar p¹ on the driving shaft t
has a constant revolving motion imparted to it through the spur wheels and w²
and and v1. In so revolving the lever pis by reason of its friction bowl taking
into the cam groove o caused to rise to the position indicated in dotted lines in
Fig. 2 so carrying upwards the slide or table e and presents the lower type e (which
has been inked by the inking rollers g) to the platen . In the same manner by the
lowering action of the cam groove the slide or table c is brought down and this time
presents to the platen the upper type d (which in descending has been inked by the
inking roller when the operation is repeated and so on continuously.
By employing the peculiar shaped cam groove o the table e is moved up and down
except at the instant of taking the impression when the friction bowl is in the cam
groove at the part marked 1 or 2 which parts being equi-distant from the centre of
motion ensure the required dwell being obtained.
む
To operate the machine for one colour printing only I disengage the intermediate
spur wheels u and and by lifting the locking device to from one groove to the other
and sliding the shaft in its bearings the spur wheel being driven by screwing up
the stud arranged in the arm of the bossy which is keyed to and revolves with
the driving shaft t-The speed of the spur wheel p is thereby increased to twice its
former speed and so causes the table e to rise and fall at a corresponding increased
rate, the upper set of type d being used as the printing surface.
It will be obvious that instead of printing in two colours I might employ the two
printing surfaces for printing two distinct subject matters the printed paper being
removed from off the platen as each impression is taken or for instance where it is
required to print ou both sides of the paper the same may be done by simply
reversing the paper from time to time.
Having thus particularly described' and ascertained the nature of this my said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1st. The improved construction of platen printing machine for printing in two
distinct colours or printing two impressions alternately in the same colours
substantially as hereinbefore described and illustrated on the accompanying
drawing.
2nd. The improved platen printing machine provided with a moveable table
carrying two chases and actuated by a cam groove and lever arrangement.mounted
and operating substantially as and for the purposes hereinbefore described and
illustrated on the accompanying drawing.
+

page_text: 3rd. In my improved platen printing machine the employment of two sets of
inking rollers and corresponding sets of type as and for the purposes hereinbefore
described and illustrated on the accompanying drawing.
Dated this 12th day of December 1890
JOHN G. WILSON,
Patent Office, 55, Market Street, Manchester, Agent for the Applicant.