Improvements in Pantograph Engraving Machines.
Year: 1899

page_text: Date of Application, 3rd July, 1899
Complete Specification Left, 3rd Apr., 1900-Accepted, 26th May; 1900'
PROVISIONAL SPECIFICATION.
Improvements in Pantograph Engraving Machines.
We, WILLIAM HENRY LOCK, Manager and Secretary of The Linotype Com-
pany, Limited, of 188. Fleet Street, in the City of London, and MARK BARR. of
The Linotype Works, Broadheath, in the County of Chester, Engineer, do hereby
declare the nature of this invention to be as follows:-
The present invention relates to improvements. in pantograph engraving
machines.
In carrying it into effect in a machine capable of dealing with two dimen-
sions, length and width, two levers of different lengths are fulcrummed upon
the frame of the machine to swing horizontally. They are kept parallel and
their motions steadied by links from one to the other. On the opposite side of
the shorter lever, a third one is adjustably fulerummed to the said frame, the
three fulcra being in line. The outer ends of the longer and the third levers,
are crossed, and through their intersection, the tracer rod is passed vertically,
that is, at right angles, with their plane, the counection being by a block
sliding in or along each lever, the said rod passing through both blocks. Or
the top of the rod may swing from a ball joint the centre of which is a fixed
point above, the connection then being by a ball and socket joint, the ball on the
rod and the socket in the intersecting levers. The outer end of the short lever
intersects the third lever, and through that intersection is passed the tool holder.
The latter is advantageously fitted with a universal plane to serve as a guide.
In carrying the same invention into effect in a machine capable of dealing
with three dimensions, length, width and depth, two levers of different lengths
are fulcrummed upon a fixed bar so as to swing horizontally thereupon. They
are kept parallel and their motions steadied by links extending from one to the
other. On the opposite side of the shorter lever, a third one is adjustably ful-
crummed upon the same bar, the three fulera being in line with each other.
The outer ends of the longer and the third levers are crossed, and the outer end of
the shorter lever likewise crosses the third lever. There is a second set of levera
and links. fulcrummed upon the opposite side of the fixed bar, the elements of
one set registering with the respective elements of the other set, but the bottom
set is. at an angle with the top set.
..
The tracer rod passes through the intersections of the two longer and two
third levers, the connections with it being by means of universal joints througli
which it can move vertically in either direction. A suitable type of joint is a
ball turning in a socket within two blocks adapted to slide lengthwise of the
respective lever. The tool carrier passes in the same way through the inter-
sections of the two shorter and two third levers and is connected with each inter-
section in the same way as the tracer rod with its levers.
The tops of both tracer rod and tool carrier are connected by universal joints
with a lever fulcrummed by means of an universal joint on a suitable fixed part
of the machine, frame. This lever is telescopic preferably on each side of the
joint that connects the tool carrier to it.
According to a modification of the above, the fixed' bar may be pivotted' to
the frame fo turn on a longitudinal axis. The top set of levers and links is
fulcrummed upon the top of the said pivotted bar, while the bottom set is ful-

page_text: crummed upon a second bar parallel with the pivotted bar just described and
likewise pivotted about an axis parallel with the axis of the said pivotted bar
and preferably upon it, the object of such second pivotting being to provide for
the adjustment of the angle which the two sets make with each other. Further,
the lever to which the tops of the tracer rod and tool carrier are jointed is dis-
pensed with.
Improvements in Pantograph Engraving Machines.
We, WILLIAM HENRY LOCK, Manager and Secretary of The Linotype Com-
pany, Limited, of 188, Fleet Street, in the City of London, and MARK BARR. of
The Linotype Works, Broadheath, in the County of Chester, Engineer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
The present invention relates to improvements in pantograph engraving
machines.
In carrying it into effect, in a machine capable of dealing with two dimen-
sions, length and width, two levers of different lengths are fulcrummed upon
the frame of the machine to swing horizontally. They are kept parallel and
their motions steadied by a link from one to the other. On the opposite side of
the shorter lever, a third one is adjustably fulcrummed to the said frame, the
three fulera being in line. The outer ends of the longer and the third levers,
are crossed, and through their intersection the tracer rod is passed vertically,
that is, at right angles with their plane, the connection being by a block
sliding in or along each lever, the said rod passing through botli blocks. Or
the top of the rod may swing from a ball joint the centre of which is a fixed
point above, the connection then being by a ball and socket joint, the ball on the
iod and the socket in the intersecting levers. The outer end of the short lever
intersects the third lever, and through that intersection is passed the tool holder.
The latter is advantageously fitted with a universal plane to serve as guide.
In carrying the same invention into effect in a machine capable of dealing
with three dimensions, length, width and depth, two levers of different lengths
are fulcrummed upon a fixed bar so as to swing horizontally thereupon. They
are kept parallel and their motions steadied by a link extending from one to the
other. On the opposite side of the shorter lever, a third one is adjustably ful-
crummed upon the same bar, the three fulcra being in line with each other.
The outer ends of the longer and the third levers are crossed, and the outer end of
the shorter lever likewise crosses the third lever. There is a second set of levers
and link fulcrummed upon the opposite side of the fixed bar, the elements of
one set registering with the respective elements of the other set.
The tracer rod passes through the intersections of the two longer and two
third levers, the connections with it being by means of universal joints through
which it can move vertically in either direction. A suitable type of joint is a
ball turning in a socket within two blocks adapted. to slide lengthwise of the
respective lever. The tool carrier passes in the same way through the inter-
sections of the two shorter and two third levers and is connected with each inter-
section in the same way as the tracer rod with its levers.
The tops of both tracer rod and tool carrier are connected by universal joints

page_text: with a lever fulcrummed by means of an universal joint on a suitable fixed part
of the machine frame. This lever is telescopic preferably on each side of the
joint that connects the tool carrier to it.
According to a modification of the above, the fixed bar may be pivotted to
the frame to turn on a longitudinal axis. The top set of levers and link is
fulcrummed upon the top of the said pivotted bar, while the bottom set is ful-
crummed upon a second bar parallel with the pivotted bar just described and
likewise pivotted about an axis parallel with the axis of the said pivotted bar
and preferably upon it. Further, the lever to which the tops of the tracer rod
and tool carrier are jointed is dispensed with.
Referring to the accompanying drawings which are to be taken as part of
this specification and read therewith.
Figure 1 is a perspective view of a two dimension pantograph engraving
machine made according to the present invention:
Figure 2 is a perspective view of a three dimension pantograph engraving
machine made according to the present invention; and
Figure 3 is a detail illustrating a. modification of the construction shewn in
Figure 2.
Referring to Figure 1, 1 is the pattern table; 2, the top moving member of
the work table made fast centrally to the bottom end of the work table spindle 3.
4 is the stationary base of the work table; 5, the intermediate moving member
sliding on guides 6, 6, fast on the base 4, 7, 7, guides on the member 5 for the
top member 2 to slide on; 8; the bridge piece fast on the base 4 and bridging the
member 2; and 9, 9, the engraving tools. 10 is the tracer rod; 11, a stationary
part of the frame of the engraving machine; and 12, a bracket from which the
tracer rod 10 depends, being connected therewith by means of a ball and socket
joint 13. All the above parts are as heretofore.
14 is a shorter, and 15 a longer, lever having their respective fulcra 16, 17,
aligned with each other upon the part 11 above mentioned, so as to swing
thereon in the same horizontal plane. These two levers are kept parallel and
their motions steadied by a link 18 pivotted by its ends at 19, 20,
to the l'ear and corresponding ends of the said levers, respectively,
as shewn. 21 is B third lever having its fulcrum 22. aligned with
the fulcra 16 and 17 above mentioned, and adjustable lengthwise on
the part 11, by any suitable device, as indicated by the slot 23. The working
position of the lever 21 is one intersecting both levers. 14 and 15. For that
purpose, it may be either upon or under then--the figure shews it as being
upon them and in a plane parallel with theirs, the part where the fulcrum 22
is, standing at a correspondingly higher level than where the fulcra 19, 20 are,
as shewn. The lever 21 intersects the two levers 14, 15, when they are parallel
with each other. The tracer rod 10 passes through the intersection of the
levers 21 and 15, the connection between the said rod 10 on the one hand and the
two levers on the other, being by means of a ball 2 on the rod 10 which slides
through it, a slot 25 lengthwise of the lever 21, a second one 26 lengthwise of
the lever 15, a plate 27 fitting down upon the top of the ball 24 and adapted to
slide to and fro along the slot 25, and a plate 28 fitting up to the bottom of the
ball 24 and adapted to slide to and fro along the slot 26, the two plates 27, 28,
holding the ball 24 and the two levers 15 and 21 between them. The spindle 3
of the top moving member 2 of the work table, passes through the intersection
of the levers 21 and 14, the connection between it on the one hand, and the two
levers on the other being by means of a slot 29 lengthwise of the lever 21, a
second one 30 lengthwise of the lever 14, a plate 31 fitting down upon the lever 21
and adapted to slide to and fro along the slot 29 and a plate 32 fitting up to the
lever 14 and adapted to slide to and fro along the slot 30; the spindle being passed
through both plates 31 and 32, as shewn.
Referring to Figure 2, the set of three levers and a link is duplicated, there
being one on the top face and a second que on the bottom face of the part 11 of

page_text: the machine frame. The same references are used for the top set of Figure 2
as for the only one of Figure 1, and are repeated with a superadded a for the
bottom combination of Figure 2. 33 is the tool spindle and 34 is the stationary
work table. Both tracer rod 10 and tool spindle 33 are connected by ball
joints 35, 36, to a lever 37 telescopic on each side of the ball joint 36 and having
its fulcrum in a ball and socket joint. 38; carried by a fixed part 39 of the machine
frame. Both tracer rod 10 and tool spindle 33, are capable of sliding, smoothly
up and down through the respective connections with the intersected levers.
In the construction illustrated in Figure 2, and described therewith, the two
sets of levers and link are parallel with each other at all times and work in
parallel planes. According to the modification illustrated in Figure 3, the
portion 11a of the frame upon which are the top set of levers 14, 15 and 21, is
pivotted upon a pair of horizontal pivots 40, 40; turning in fixed portions 41, 41,
of the frame of the machine. The bottom set, 14, 15 and 21, is pivotted upon
two pieces 42 pivotted upon a rod 43 passed longitudinally through an exten-
sion 44 of the portion 11*.
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. The combination in a two dimension pantograph engraving machine, of
two levers of different lengths fulcrummed on a fixed part of the machine'; a
steadying link pivotted to the corresponding ends of both; a third lever ful-
crummed on the same fixed part of the machine frame, the three fulcra being
aligned with each other and the said third lever intersecting the two first mentioned
ones; tracer rod connected with the said levers by being passed through the
intersection of the longer and the third lever; and work table spindle connected
with the same levers by being passed through the intersection of the shorter and
the third lever.
: i
2. The combination in a three dimension pantograph engraving machine, of
two sets of levers and a link adapted to work in parallel planes, each set con-
sisting of two levers of different lengths fulcrummed on a fixed part of the
machine a steadying link pivotted to the corresponding ends of both; a third
lever fulcrummed on the same fixed part of the machine frame, the three fulcra
being aligned with each other and the said third lever intersecting the two first
mentioned ones; tracer rod connected with both sets by being passed through
the intersection of each third lever with the respective longer one; and tool
spindle connected with both sets by being passed through the intersection of
each third lever with the respective shorter one..
3. The combination in a three dimension pantograph engraving machine, of
two sets of levers and a link, each set consisting of two levers of different lengths;
a steadying link pivotted to the corresponding ends of both levers; a third lever
having its fulcrum aligned with those of the two levers above mentioned and
itself intersecting them both, the first mentioned set fulcrummed upon a part of
the machine frame turning about a horizontal axis in the said frame and the
second set pivotted to turn about a horizontal axis in the last mentioned part of
the machine frame; tracer rod connected with both sets by being passed through
the intersection of each third lever with the respective longer one and tool spindle
connected with both sets by being passed through the intersection of each third
lever with the respective shorter one.
1000
CHAS, S. WOODROFFE,
188, Fleet Street, London, E.C., Chartered Patent Agent.