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

page_text: Date of Application, 12th Jan., 1897
Complete Specification Left, 7th Oct., 1897-Accepted, 4th Dec., 1897
PROVISIONAL SPECIFICATION.
Improvements in and applicable to Platen Printing Machines.
CHARLES ARTHUR CHARLTON, of Patrick Rood, West Bridgford, Nottingham
Machine Builder, HENRY ERNEST NEWSTEAD, of Charnwood Grove West Bridgford,
Nottingham, Machine Builder, and, SYDNEY HARRY CROPPER of Chaucer Street,
Nottingham Machine Builder do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in and applicable to platen printing
machines, the said improvements being particularly applicable to platen printing
machines with stationary type beds.
The object of this invention is the provision of means by which the impression
may be thrown "on" and "off," and also means by which the amount of impression
may be varied, such means being applied to the shaft carrying the platen or platen
carriage, or to the bearings of the said shaft.
When this invention is applied to a machine in which the platen or platen carriage
oscillates on its carrying shaft, the ends of such shaft are made eccentric with regard
to that part of the shaft on which the platen or platen carriage oscillates, and one or
both ends of the shaft, is, or are, fitted with levers which can be moved through a
predetermined angle and so change the position of the centre about which the platen
or platen carriage oscillates.
When the invention is applied to machines in which the platen or platen carriage
oscillates with its carrying shaft the said shaft oscillates in eccentric bushes which
are actuated simultaneously from one or both ends to change the position of the
centre about which the platen or platen carriage oscillates.
The machine is provided with stops and catches for limiting the movement of the
eccentric shaft or bushes, and the amount of the impression is regulated by varying
the relative positions of the stops and the centre about which the platen or platen
carriage oscillates.
Improvements in and applicable to Platen Printing Machines.
CHARLES ARTHUR CHARLTON of Patrick Rood, West Bridgford, Nottingham,
Machine Builder, HENRY ERNEST NEWSTEAD of Charnwood Grove, West Bridgford
Nottingham, Machine Builder, and SYDNEY HARRY CROPPER, of Chaucer Street
Nottingham, Machine Builder do hereby declare the nature of this invention and in
Duin 77

page_text: what manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
66
on
This invention relates to improvements in and applicable to platen printing
machines, and has reference to machines with stationary type beds and in which
the platen or platen carriage oscillates upon a shaft; the object of the invention
being the provision of means for enabling the impression to be thrown
" and
"off," and for enabling the amount of impression to be varied.
According to this invention the platen oscillates on a shaft which is eccentric
with the ends of the same and is turned for throwing the impression "on" and
"off" by means of a lever which is fastened thereto and is fitted with stops and
catches for holding the shaft in its turned position Means may also be provided for
varying the position of the stops and catches so that the amount of impression may
be varied.
In the accompanying drawings Fig 1 is an elevation of the improved mechanism,
and
Fig 2 is a sectional plan of the same.
a
The platen is adjustably fixed to a frame or carriage a¹ which oscillates on a shaft b
and the ends c of the latter are turned eccentrically therewith and have bearings in
the two side standards d. The bearing in one standard is preferably formed by a
revolable bush e to allow of the shaft 6 being withdrawn but a solid bearing may be
used if the end of the shaft is made larger than the eccentric portion of the same.
The lower part of the platen frame or carriage a is provided with a projecting piece f
which is coupled to the platen operating mechanism.
On the end of the shaft b there is fitted a lever g. provided with a sliding catch h
which is held in the recesses in the boss e by a spring and there are on the boss e,
projecting pieces m which limit the amount of the motion of the lever g and ensure
the catch being in position to enter one of the recesses k.
In Fig 1 the position of the platen and the lever h when the impression is off are
indicated by dotted lines.
For enabling the amount of the impression to be varied the boss e is fitted to turn
in the standard d and thereby vary the position of the stops m, so that although
the shaft b is turned through the same angle it is turned in a different position. For
this purpose teeth may be cut in the edge of the boss e and it may be rotated by a
sliding rack actuated by a screw, or a worm may be used instead of the rack.
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 platen printing machine mounting the platen frame or Carriage upon a shaft
whose ends are eccentric with the part on which the platen frame or Carriage
oscillates, and the combination of the same with a lever for turning the shaft
and catch mechanism for holding the same arranged and operating substantially as
herein shown and described with reference to the accompanying drawings.