A Guard for Platten Printing Machines.
Year: 1899

page_text: Date of Application, 7th Apr., 1899
Complete Specification Left. 8th Jan., 1900-Accepted, 3rd Mar., 1900
PROVISIONAL SPECIFICATION.
A Guard for Platten Printing Machines.
We, HORTON HARRILD, of the Firm of Harrild & Sons, of 25, Farringdon
Street, in the City of London, Printing Machine Manufacturers, and JAMES
GEORGE PARKINS, of the same place, Clerk, do hereby declare the nature of this
invention to be as follows:-
This invention has reference to platten printing machines and its object is to
provide a guard to prevent the liability of the attendant through carelessness
getting his fingers injured between the platten and the bed or forme.
According to our invention we employ a guard piece extending transversely
of the machine and which as the platten moves forward. rises above the platten
so as to guard the opening between the latten and the bed or forme and which
as the platten retires, descends clear of the said opening so as to allow the
The above movements
printed sheet to be taken off and a white sheet fed in.
can be given to the guard by any suitable means. The preferred way is to fit
the guard with arms which are attached to the rocker and as the rocker moves
slide in guides at the back of the platten.
ill of A 1900
J. C. MEWBURN & ELLIS,
55 and 56, Chancery Lane, London, Chartered Patent Agents.
A Guard for Platten Printing Machines.
We, HORTON HARRILD, of the Firm of Harrild & Sons, of 25, Farringdon
Street, in the City of London, Printing Machine Manufacturers, and JAMES
GEORGE PARKINS, of the same place, Clerk, 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 has reference to platten printing machines and its object is to
provide a guard to prevent the liability of the attendant through carelessness
getting his fingers injured between the platten and the bed or forme.
According to our invention we employ a guard piece extending transversely
of the machine, and which as the platten moves forward rises above the platten
so as to guard the opening between the platten and the bed or forme, and which
as the platten retires, descends clear of the said opening so as to allow the

page_text: printed sheet to be taken off and a white sheet fed in. The above movements
can be given to the guard by any suitable means. The preferred way is to fit
the guard with arms which are attached to the part, such as the rocker in a machine
of the Bremner type,, which communicates the rocking motion to the platten.
We will describe our invention as applied to a machine of the Bremner type,
and its application to machines of other types will then be readily understood.
The accompanying drawings show. so much of a platten machine of the type
in question as is necessary to illustrate our invention.
In these drawings, Figure 1 is a side view, and Figure 2 a face view showing
the guard secured to the rocker and raised to guard the opening between the
platten and the bed. Figure 1 also shows in dotted lines the positions of the
platten, rocker and guard when the platten has moved back to allow a fresh sheet
to be fed into the machine.
a is the platten and the guard piece, which extends transversely of the
machine and is carried on armis 61 61. The arms are cut away near their
lower ends in order to give passage to the journals ¹¹ of the rocker c. The
arms of the guard are secured by screws or the like to the rocker c at each side
thereof as shown. is the ordinary rocking shaft which imparts the rocking
motion to the rocker e in the well known manner through the intermediation
of arms or levere e one at each side of the machine, in which arms or levers the
rocker is journaled. The rocker in its rocking movement slides in the well
know manner in a dovetail guide f at the back of the platten, and thus trans-
mits the rocking motion to the platten. is the bed of the machine, the inking
table, the inking rollers, and the feed table of the machine.
It will readily be understood that as the platten advances to effect the impres-
sion under the action of the rocker c the guard moves forward and upward with
the rocker until when the platten has been carried to the printing position
against the bed g the guard will have risen above the platten to guard the open-
ing between the platten and the bed. If through carelessness the hand of the
attendant has not been withdrawn after feeding the sheet of paper, the guard in
its rise will push the hand of the attendant away from the platten and prevent
any possibility of its being crushed.
Upon the return of the platten, the guard recedes and descends with the
rocker, and as this latter pivots downwards on its journals in the arms or levers e
the guard turns with it and folds beneath the platten in the position shown in
dotted lines Figure 1, so as not to interfere with the feeding of a fresh sheet
of paper into the machine.
It will be understood that other means than those described may be adopted
for imparting the desired motions to the guard, according to the particular
machine to which the guard has to be fitted.
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 platten printing machine, a guard adapted to be automatically brought
during the forward motion of the platten into position above the platten to
prevent the hand of the operator being caught between the platten and the
forme, and in the return movement of the platten to be automatically with-
drawn into such a position as not to interfere with the feeding of the next sheet
of paper into the machine, substantially as and for the purpose described.
2. In a platten printing machine, the combination with the platten of a guard
connected to the part which communicates the rocking motion to the platten in
such manner that during the forward movement of the platten the guard moves
forward therewith and at the same time rises to guard the opening between the
platten and the forme, and in the return movement of the platten the guard is
folded down beneath the platten to enable the next sheet to be fed in all sub-
stantially as and for the purpose described.

page_text: 3. The improved guard for platten printing machines constructed and operat-
ing substantially as described and shown in the accompanying drawings.
Dated this 8th day of January 1900.
J. C. MEWBURN & ELLIS,
55 and 56, Chancery Lane, London, Chartered Patent Agents.