Improvements in and relating to Hand-guards for Platen Printing Machines.
Year: 1899

page_text: Date of Application, 29th Sept., 1899
2000
2000
PROVISIONAL SPECIFICATION.
Improvements in and relating to Hand-guards for Platen Printing
Machines.
We, THOMAS PALLISTER and GEORGE WILLIAM PALLISTER, of the Firm of
Messieurs George Pallister and Sons, of 41, Woodhouse Lane, Leeds, in the
County of York, Printers' Furnishers, and FRED NAYLOR, of 8, Elmfield Street,
Wortley Leeds aforesaid, Fitter, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in hand-guards or rails for platen
printing machines, and its object is to provide a rising guard or rail, constructed
as hereafter described, which operating automatically prevents an attendant from
allowing his fingers or hand to remain too long for safety between the platen
and the type, when contact between these two surfaces is imminent.
According to this invention we employ a rod or rail which extends horizontally
across and above the top of the platen. The said rod or rail may (or may not)
be weighted at one end, and is suitably hinged or connected by a knuckle-
joint to the upper end of, say, a vertical support arranged to slide in bearings
by which it is attached to the side of the platen. The opposite or lower end
of the vertical support is armed with a pin, at or about a right angle to the
said support, on which is mounted a runner. To one of the side roller arms
of the machine is clamped or otherwise attached and fixed a cam path or groove
to form, say, a box cam of the desired shape, length, and contour with which
the before mentioned runner is made to engage for imparting a continuous or
intermittent vertical or angular reciprocating motion to the rail or rod simul-
taneously with the radial reciprocating motion of the platen. In some cases,
and when so desired, a recess may be formed in the cam path, or a portion of
the lower ledge or lip of the cam groove may be removed to allow the runner
and its support rod to automatically drop after the latter have travelled up or
along the cam path or groove a predetermined distance, thus obviating the
runner passing down the cam path or groove during the movement of the platen
from the type. A fixed guide for the free or weighted end of the rod or rail may
or may not be provided for its reception on the platen.
By jointing the said rail or rod so that it is held in a horizontal position over
the platen at one time, but capable of rising automatically should any obstruc-
tion come in the way of its under edge or portion, provision is secured whereby
the trapping of the attendant's hand or fingers by the said rail or rod is obviated.
As the platen approaches the type, for the purpose of taking an impression.
the vertical support to which the guard rod or rail is jointed begins to rise, and
by the time the two opposing surfaces are nearly in contact, the said guard rod

page_text: or rail has risen sufficiently to have removed from danger the hand or fingers of
the attendant who has been placing the paper in position upon the platen.
Dated this Twenty-seventh day of September 1899.
THOS. PALLISTER.
GEORGE W. PALLISTER.
FRED NAYLOR?
Improvements in and relating to Hand-guards for Platen Printing
Machines.
༩、-ད་,,, i[*
We, THOMAS PALLISTER and GEORGE WILLIAM PALLISTER, of the Firm of
Messieurs George Pallister and Sons, of 41, Woodhouse Lane, Leeds, in the
County of York, Printers' Furnishers, and FRED NAYLOR, of 8, Elmfield Street,
Wortley Leeds aforesaid, Fitter, 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 hand-guards or rails for platen
printing machines, and its object is to provide a rising guard or rail, constructed
as hereafter described, which operating automatically prevents an attendant from
allowing his fingers or hand to remain too long for safety between the platen
and the type, when contact between these two surfaces is imminent.
In the drawings hereunto annexed
Fig. 1 is a part elevation of a platen printing machine with this invention
applied.
Fig. 2 a part back elevation of same.
Figs. 3 to 10 are respectively elevations and plans of detailed parts forming
this invention.
Like parts in all the views are marked with similar letters of reference.
A is the platen which is mounted in bearings B upon framework C a portion
only being shown in the drawings. A radial reciprocating motion is imparted
to the platen A through the slide blocks D,-working in the slides E at the
back of the platen, by levers F,-mounted in bearings G on the framework C,-
to which a radial reciprocating motion is imparted in the usual manner.
All the above described parts may be of ordinary and well known construction
and operate in the usual manner.
H is a rod or rail which extends horizontally across and above the top of
the platen. The said rod or rail may, if so desired, be weighted at one end but
it is not so shown in the drawings, as it will work effectually without the weight,
and it is suitably hinged or provided with a knuckle joint h attached to the
upper end of a vertical or other support I. The support I is arranged to slide
in bearings J by which it is attached to the side or end of the platen A so as to
travel therewith.
The opposite or lower end of the support I is armed with a pin or screw K,--
at or about a right angle to the said support,-on which is mounted a runner L
(Figs. 3 and 4). To one of the side roller arms M (of ordinary construction)
of the machine is fixed by clamps N (Figs. 6 and 8) or otherwise attached a
cam path or race having a groove cut in it to form, say, a box cam 0 of the
desired shape, length angle, and contour with which the before mentioned
runner L is made to engage for imparting a continuous or intermittent or vertical
or angular reciprocating motion to the rail H simultaneously with the radial
1.53 R

page_text: reciprocating motion of the platen A. A set screw N¹ may be employed for
additionally securing the clamp O in position on the side rod M. In some cases,
and when so desired, a recess may be formed in the cam path, or a portion of
the lower ledge or lip of the cam groove may be removed to allow the runner
and its support to automatically drop after the latter has travelled up or along
the cam path or groove a predetermined distance, thus obviating the runner
passing down the cam path or groove during the movement of the platen from
the type.
A fixed guide for the free or weighted end of the rod or rail may, if desired
be provided for its reception on the platen; but in practice we have not found
this to be necessary so have not shown it in the drawings.
The rail H is caused by the runner L working down the cam path 0, to descend
in its guides J at the same time that the platen A is receding from the type,
and should the operator, in removing a printed impression either by carelessness
or otherwise, have placed his hand or fingers on the top edge of the platen A
and under the rail H, instead of above it, then to obviate the trapping or injuring
the hands or fingers the said rail is provided with knuckle joint has described.
The said knuckle joint enables the rail H to have a horizontal movement imparted
to it, in addition to those described for reciprocating it, namely, a movement
away from the inner face of the platen towards the face of the type.
As the platen A approaches the type, for the purpose of taking an impression,
the support I to which the guard rail H is jointed as described, begins to rise,
and by the time the two opposing surfaces are nearly in contact, the said guard
rail will have risen sufficiently to have removed from danger the hand or fingers
of the attendant who has been placing the paper in position upon the platen A
If desired the herein described jointed guard rail H may be combined with
and its rising and falling controlled by the means similar to those described
in the Specification of Letters Patent granted to George Arthur Pindar, dated
the Twentieth day of August 1897, No. 19261.
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. A hand guard for platen printing machines consisting essentially of a
top rail provided with a knuckle joint and connected at its rear end to a recipro-
cating support arranged to work in guides fixed to the platen, said reciprocating
support receiving its motion from a cam path fixed to one of the side roller
arms of the machine, all of said parts being arranged and combined substantially
as herein set forth and illustrated in the annexed drawings.
Dated this Twenty-fifth day of May 1900.
THOMAS PALLISTER.
GEORGE W. PALLISTER.
.FRED NAYLOR.
By W. Fairburn-Hart,
Agent.