Improvements in Pantograph Engraving Machines.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Pantograph Engraving Machines.
We, WILLIAM HENRY LOCK, Manager and Secretary of The Lintoype Company
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, more especially to those capable of dealing with three dimensions,
length, width and depth, by a swinging and vertically moving tracer and ver-
tically moving tool.
The tracer rod is in two portions connected together telescopically...The
bottom portion is outside the top one, the latter being connected by a ball and
socket joint to a horizontal plane. The tracer rod as a whole swings by a ball
joint on the bottom portion from a point which is adjustable vertically for ratio
between pattern and work, this ball joint being a fulcrum common to both
portions. The top of the outer portion connects by a ball joint to a horizontal
universal plane and the top of the inner tracer to one in a second plane above the
former. Each guide of the two planes is capable of a reciprocating vertical motion
upon fixed rods or their equivalent. A lever is pivotted by one end to the top
guide and has its opposite end pivotted upon a fixed fulcrum. A second lever is
pivotted upon the lower guide. Both levers are connected by a link joining
them at points between the pivots of each. Either or both of these points may
be adjustable lengthwise of the levers. There is a second link from the outer
end of the second lever to a third lever having a fixed fulcrum. A third link.
connects this third lever to a fourth likewise having a fixed fulcrum and which
moves the tool up or down according to the motion of the second link. Both
ends of the third link are adjustable along the respective levers.
When the tracer point is moved horizontally over the pattern, the tracer rod
Bwings on the common fulcrum, thereby moving the bottom universal plane
vertically and the top one vertically also but for a shorter distance. The down-
ward motion (say) of the bottom plane, would raise the tool,, but the drop of the
top plane prevents that by lowering the fulcrum of the lever which actuates the
second link and so prevents the latter being lowered. In this way the vertical
motion of the bottom plane in either direction generated by the horizontal motion
of the tracer point is nullified before it can reach the tool.
The distances that the two universal planes rise or fall are proportional to the
lengths of the two portions of the tracer rod and are independent of the fulcrum
which is common to them both.
With reference to the third dimension motions of the tracer point, such
motions are communicated to the tool, through the bottom universal plane, the
Jever connected to it, and the second link above mentioned.
Dated this Ind dow of Tis 1900

page_text: ** Improvements in Pantograph Engraving Machines.
We, WILLIAM HENRY LOCK, Manager and Secretary of The Lintoype Company
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 capable of dealing with three dimensions, length, width and depth, by
a swinging and vertically moving tracer rod and horizontally and vertically
moving tool. The accompanying, ngure is a diagrammatic side elevation partly
in section. It does not include the means by which the swinging motions of the
tracér rod are converted into horizontal motions of the tool, for the reason that
those means do not form any part of the presents invention. Any of the well-
known horizontally acting pantographic linkages may be applied to the mech-
anism illustrated for the purpose.
The dimensions of length and width above mentioned are included hereinafter
in the expression lateral movements or motions, and the dimension of depth is
referred to as vertical movement or motion." Many of the movements of the
tracer point are neither truly lateral nor truly vertical, but compounds of both.
The lateral components of such movements are effected by the horizontally acting
pautographic linkage above mentioned and the vertical components by the mech-.
anism of the present invention.
The present invention therefore consists in improved means for transmitting
the vertical movements or the vertical components of the movements of the tracer
point to the tool and of means for preventing the lateral movements or the lateral
components of the movements of the tracer point producing vertical movements.
in the tool. For convenience sake, we will describe the latter part first.
a is the pattern having a projection b on its surface. This projection is intro-
duced into the figure to shew how the invention deals with it by its vertical
motion so as to make the tool c reproduce it at 6' in the work d.
The tracer rod is in two portions which are connected together telescopically.
The bottom portion 1 of it is outside the top portion 2 and slides over it. The
connection between the two portions consists of two vertical slots 3 in the outer
or bottom portion 1 and opposite to each other, a horizontal pin 4 passed through
the bottoni end of the inner portion 2 and engaging in the respective slots 3, 3,.
and a ball 5 surrounding the bottom portion 1. which is capable of sliding freely.
through it and having the ends of the pin 4 prolonged and entered into it so as to..
hold it fast to the inner portion 2. The ball 5 is mounted by any suitable means
to move in a universal fixed horizontal plane. The length of the pair of slots 3, 3,
is not less than the maximum vertical movement or, vertical component thereof
which is required of the tracer point e. The tracer rod 1, 2, as a whole swings
in a ball anil socket joint 8 which is adjustable vertically for ratio between the
pattern and the work d, this joint 8 being the fulcrum of the said rod. The
part 1 is capable of sliding freely through the ball of the joint 8. The top of
the inner portion 2 swings by a ball and socket joint 6 in a horizontal universal
plane 7, the guides 12, 12 of which enjoy a vertical sliding motion upon a pair,
of fixed standards 14, 14: The top of the inner portion 1 is likewise connected
by a second ball and socket joint 10 to a second horizontal universal plane 11,
the guides 13, 13, of which are likewise capable of a vertical sliding motion 'on
the said standards 14, 14. :

page_text: The joint 8 is carried bracket-wise by a block 9 adapted to slide upon a fixed
vertical guide 9 formed on, the machine frame A, for the purpose of adjusting
the ratio of lateral dimension between the pattern and the work. The said
guide 9 and block 9 are provided with the usual scale and vernier respectively.
15 is a lever having one end pivotted to the adjacent guide 12 at 16 and its
opposite end pivotted on a fulcrum 17 fixed to the frame A of the machine. 18 is
a second lever having one end pivotted to the adjacent guide 13 at 19. The
levers 15 and 18 are connected by a link 20 which has a vertical motion in a
suitable part of the frame A as in a guide as shewn. The said link is pivotted
to the lever 15 at 21 and to the lever 18 at 22. This point 22 is also the fulcrum
of the lever 18 and upon this fulcrum. it rocks only when there is vertical motion
of the tracer rod up or down a projection b on the pattern, to be communicated-
to the tool c The said lever 18 is connected to the tool c by the following
means. 23 is a link from the said lever, sliding in a guide fast in the frame Å
as shewn, to the lever 24 having its fulcrum 25 in a fixed point on the said frame.
26 is a link from the end of the lever 24 opposite to its fulcrum, to one end of a.
leyer 27 having its fulcrum at 28 in the main frame A and its opposite end
pivotted at 29 to a rod 30 which carries the tool c and is capable of a reciprocating
motion only in a guide 31 in the said frame A. The link 26 is adjustable
horizontally along slots 32, 33, in the levers 24 and 27 respectively, for ratio of
vertical reduction between a projection b and its reproduction b' in the work d.
C
The above mentioned lever 18 may rock upon the fulcrum 22 without pro-
ducing any vertical motion in the rod 23. And this will often occur during
purely lateral movements of the tracing point. The movement is as follows.
If the pivot 19 rises, it tends to push the rod 23 down, but if the moving ful-
crum 22 is raised proportionally as the pivot 19 rises, then there is no downward
motion imparted to the rod 23.
The invention constructed as above described acts as follows. When the point e
of the tracer rod 1, 2 is moved horizontally over the pattern a, the tracer rod
itself swings on its fulcrum 8. Let it be supposed that the motion of the point e
is a lateral one from the centre of the pattern towards one edge of it. The
bottom portion 1 of the rod 1, 2, will slide down over the inner portion 2,
through the ball of the joint 8, (the ball 5 being in a fixed plane, prevents ho
said portion 2 being taken along with it), and move the guides 13 of the universal
plane 11, down the standards 14. That motion of the guide 13 on which the
lever 18 is pivotted, would beget a vertical motion in the tool c, for which there
is no cause in the pattern. It is therefore neutralised by the curved motion of
the ball of the joint 6 which is the top end of the compound tracer rod 1, 2. The
consequent motion of the universal plane 7 down the standards 14, 14, drops the
fulcrum 22 just far enough to prevent the lever 18 moving the link 23 under
the influence of the above described downward motion of the guides 13.
Having described above how the present invention prevents the lateral move-
ments or the lateral components of the movement of the tracer point e over the
pattern a, producing any vertical motion in the tool, c, we will proceed to de-
scribe how the vertical movements of the vertical components of the movements
of the said point are communicated to the said tool. The motion of the point e
up the side of a projection b, has a vertical component. This vertical component
is transmitted by the outer portion 1 of the compound tracer rod 1, 2, sliding
upwards through the ball of the joint 8, to the guide 13 to which the lever 18 is
pivotted, thereby rocking the said lever on its fulcrum 22 and continuing the
motion to the tool e through the link 23, lever 24, link 26, lever 27 and rod 30.
The fulcrum 22 remains stationary because the upward motion of the guides 13
is not communicated to the guides 12 and lever 15, because the above mentioned
outer portion 1 of the compound tracer rod 1, 2, slides freely over the inner
portion 2, and 2 is held with its ball 5 to the fixed plane already mentioned.
So when the tracer point e descends the projection 6 on the other side of it, the
downward motion of the portion 1 takes the guide 13 down with it but slides

page_text: down over 2 because the latter has its ball 5 free to move only in the horizontal
plane, and rocks the lever 18 accordingly, sliding the while over the portion 2
without disturbing the guides 12 and the lever 15.
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 of swinging compound tracer rod consisting of two por-
tions telescopically connected together; an universal plane capable of a reciprocat-
ing vertical motion jointed to each portion of the said rod; a lever and link
mechanism from the universal plane of that portion of the tracer rod that
carries the tracer point, to the tool, adapted' to transmit to the latter, the
vertical movements or vertical components of the movements of the tracer point;
and a connection between the two planes to prevent a lateral movement or a
lateral component of a movement of the tracer rod producing a corresponding
vertical movement in the tool. .
2. The herein before described combination of swinging compound tracer rod
having a bottom and outer portion adapted to slide over the top and inner por-
tion, which latter has its lower end fitted with a joint or termination which never
rises or falls above or below a fixed plane, but which has universal lateral freedom
in that plane; a fulcrum for the tracer rod as a whole; an universal plane jointed
to the top end of the said top and inner portion and capable of a reciprocating
vertical motion; an universal plane jointed to the top end of the said bottom
and outer portion and capable of a reciprocating vertical motion; a lever having
a fixed fulcrum and its outer end connected to the universal plane of the said
top and inner portion; a lever connected to the.universal plane of the said bottom
and outer portion of the tracer rod; a link connecting the two levers and a link
and lever mechanism establishing a connection between the last mentioned lever
and the tool to transmit the vertical movements or vertical components of the
movements of the said bottom and outer portion of the tracer rod to the tool.
Dated this 3rd day of April 1900.
CHAS. S. WOODROFFE,
Chartered Patent Agent.