Improvements in Engraving Machines.
Year: 1899

page_text: Date of Application, 7th Mar., 1899
1000
Date of Application, 7th Mar., 1899
Complete Specification Left, 7th Dec., 1899-Accepted, 3rd Mar, 1900
PROVISIONAL SPECIFICATION.
Improvements in Engraving Machines.
We, WILLIAM HENRY LOCK, Manager and Secretary of The Linotype Company,
Limited, of No. 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 engraving machines and is
more especially applicable to a pantograph engraving machine; the tracer or
stylus or follower rod of which is constantly vertical. The object of the invention
is to endow such machines with a third dimension capacity i.e., with a capacity
for engraving in relief.
In carrying it into effect, there is provided a lever which has an adjustable
fixed fulcrum on the side of the tool and work opposite to the follower rod.
The other end of the lever is pivottally connected to the top of a rod standing
up from a universal plane to the sliding plate of which the follower rod is made
fast. The guide in which the said plate slides has a vertical motion between
suitable guides, to enable it to follow the third dimension or upward and down-
ward motion of the follower rod. The tool or the pin which moves the work
table has a similarly constructed and acting universal plane and guide combined
with it, and the said plane is connected to the lever in the same way as the
universal plane of the follower rod. The lever is telescopic on each side the point
at which the universal plane of the tool or the pin above mentioned is connected
to it to enable it to lengthen or shorten. The distance on the lever between the
two rods standing up from the guides of the universal plates is constant, the
adjustability of the fulcrum of the lever providing for the ratio of reduction
between the pattern and the work.
Improvements in Engraving Machines.
We, WILLIAM HENRY LOCK, Manager and Secretary of The Linotype Company,
Limited, of No. 188, Fleet Street, in the City of London, and MARK BARR, of
The Linotype Works, Broadheath, in the County of Chester, Engineer, do hereby
[Price 8d.1

page_text: 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 state-
ment:-
-
The present invention relates to improvements in pantograph engraving
machines, the tracer rod and tool of which are constantly vertical.
Up to the present time, engraving machines have been restricted to working in
any direction in a single plane-generally a horizontal one. The present inven-
tion consists in both the tracer and the tool having a capacity for working
in any direction in the same plane and also for working in a direc-
tion at right angles with that plane. In carrying it into effect, the tracer is
made capable of a reciprocating vertical motion, and a like vertical motion at
the work end of the machine is provided for, of which either the tool or the work
table is capable. The term "work end of the machine" is used to indicate that
end of it where the tool and work co-operate. This co-operation is as heretofore.
It is immaterial for the purpose thereof, whether the tool moves over the work
or whether the work is moved past the tool.
The means by which the above mentioned like vertical motion at the working
end of the machine, is secured, may, for the purpose of the present invention, be
applied to either the tool or to the work. The horizontal motion of the tracer is
guided by a universal plane to which it is made fast. Whichever of the two-tool
or work table-has not the capacity for reciprocating vertical motion-has a
horizontal motion in any direction, thus constituting it the horizontally moving
member at the work end of the machine. Such horizontal motion is likewise
guided by a universal plane. The pantograph is connected to the tracer and to
the horizontally moving member at the work end of the machine. The reci-
procating vertical motion of the tracer is transmitted in the proper, proportion
to the tool through a lever which has its fulcrum adjustable for ratio between
pattern and work and is pivottally connected to both tracer and tool. It is also
adapted by means of telescopic joints, to automatically compensate for variations
in its length.
Referring to the accompanying drawings which are to be taken as part of this
specification and read therewith:-
Figure 1 is a side elevation illustrating the invention constructed with
stationary work table.
Figure 2, a plan corresponding therewith: and
Figure 3, a side elevation illustrating the invention constructed with a hori-
zontally moving work table.
Referring first to Figures 1 and 2, 1 is the base; 2, the pattern; 3, an elevated
part thereon; 4, a standard held to the base 1 by screws 5 screwed down there-
into through a flange 7; 8, 8. a pair of parallel arms standing out horizontally
from the top of the standard 4 in the direction of the work end of the machine,
to carry posts 9, 9, whose function is to act as fixed guides for the vertical motion
of the guide 10 of an universal plane 12. The arms 8, 8, stand apart from each
other far enough to allow of the horizontal motion of the tracer 13. This guide 10
is guided in its said motion by the four posts 9, by means of that number of
lugs 11, projecting diagonally from each of its corners and perforated to pass over
the said posts and to slide freely up and down them. The height of the posts 9. 9,
must be sufficient to allow of the maximum vertical motion of the tracer. 12 is
the universal plane of the tracer. It is capable of a horizontal motion in any
direction. 13 is the tracer. It is made fast centrally to the underside of the
universal plane 12 from which it depends vertically between the arms 8, 8. Pass-
ing now to the work end of the machine, 14 the work table; 15, the work
held down upon it by any suitable means and 16, a projection upon it, corre-
sponding respectively with the pattern 2 and the projection 3. 17 is a standard
fixed to the base 1 by flange 18 and screws 19 in the same way as the standard 4
already described. 20, 20 are a pair of parallel arms standing out horizontally

page_text: from the top of the standard 17, in the direction of the tracer and pattern to
carry four posts 21, whose function is to act as fixed guides for the vertical
motion of the guide 22 of the universal plane 23 of the tool. The arms 20, 20
stand apart from each other far enough to allow of the lateral motion of the tool.
This guide 22 is guided in its said motion, by the four posts 21, by means of as
many lugs 24 projecting diagonally from each of its corners and per-
forated to pass over them respectively and to slide freely up and down them.
The height of the posts 21 must be sufficient to allow of the maximum vertical
motion of the tool. 23 is the universal plane of the tool. It is capable of a
horizontal motion in any direction proportionate to the motion of the tracer in
the same direction. 25 is the tool post. 26 is the tool carried by the bottom end
of the post 25 and capable of rotation therein about an axis common to them both
by means of a driving band passed round the pulley 27 fast to the tool. This
combination of tool post 25, tool 26, driving pulley 27 and band, is of the usual
description. Both guide plates 10 and 22 have openings 28 in them of correspond-
ing areas, to allow of the horizontal motions of the tracer 13 and the tool post 25,
respectively. 30 is the lever connecting the two guide plates 10 and 22 and 31 is
its fulcrum. It is connected to the guide plate 10 of the tracer 13, by a pivot
joint 32 having a horizontal axis, on the top of a post 33 standing up from the
centre of the top of the said guide plate 10 to which it is made fast; and to the
guide plate 22 by a similar pivot joint 34 on the top of a post 35 standing up
from the centre of the top of the said guide plate 22. The fulcrum 31 is an
universal joint on the top of a post 36. This fulcrum 31 is fixed for any given
length of the lever 30 between it and the pivot 32, but it is adjustable horizontally
for ratio between the pattern and the work, in the direction of its own length, along
a guiding groove 37 in a bracket 38 projecting from the standard 17. 39 is a
scale on the top of the bracket 38 to guide the operator in adjusting the position
of the fulcrum 31, and 44 is a set screw for holding the fulcrum in its adjusted
position. To allow of the variations in the height of the fulcrum 31 above the
bracket 38, due to the varying position of the fulcrum 31 along the said bracket,
the post 36 is adjustable vertically in a socket 40 in which it can be fixed at
any height by a set screw 41. It is, therefore, the socket 40, acting as the foot of
the post 36. which engages directly in the groove 37. 42 is a telescopic joint
in the length of the lever 30 between the fulcrum 31 and the pivot joint 34. and
43 is a second one between the said pivot joint 34 and the pivot joint 32, to
compensate for the variations in the length of the lever 30 which will occur
with the reciprocating vertical motion of the two pivot joints 34 and 32.
45 is a pantograph connecting the tracer 13 and the tool post 25. Any suitable
type of pantograph may be used-the invention imposes no limit in that respect.
It requires only that the pantograph connect the tracer and the horizontally
moving member at the work end of the machine-the tool in the construction
being described to each other directly.
The
The action of the invention constructed as above described is as follows.
pantograph 45 is first adjusted and then the position of the fulcrum 31, both for
the desired ratio between the pattern 2 and the work 15. So long as the tracer 13
has only to move over the pattern 2 in the horizontal plane, its motion is com-
municated through the pantograph 45 to the tool post 25, the motions of both:
tracer 13 and tool post being steadied by the respective universal planes 12 and 23,
and the lever 30 automatically shortening and lengthening itself accordingly, as
the pivot joints 32 and 34 reciprocate vertically. But when the contour of the
pattern 2 requires the point of the tracer 13 to rise, as would be the case when
it came to deal with a projection such as 3, the universal plane 12 pushes the
guide plate 10 up to the guide posts 9, carrying the pivot joint 32 vertically
upwards with it. The fulcrum 31 of the lever 30 being held against vertical
motion by its connection to the bracket 38. the arcual motion of the lever 30
upwards, pulls the pivot joint 34 upwards, for a corresponding distance accord-
ing to the ratio between pattern and work established by the above described

page_text: adjustment of the pantograph 45 and lever 30. The upward motion of the pivot
joint 34 must be vertical because of the engagement of the posts 21 in the lugs 24,
and is shared by the tool 26. When the point of the tracer 13 is dealing with
the horizontal top of the projection 3, the machine works as with any other
horizontal surface. When it has to descend one of the sides of the said pro-
jection 3, the two guide plates 10 and 12 are moved vertically downwards, the
former by the descent of the tracer 13 and the latter by the descent of the
lever 30. The pantograph 45 always moves up and down with the tracer 13 and
the tool post 25.
The projection 3 is shewn as rectangular in cross section to the better illustrate
the sequence of horizontal and vertical motions on the part of the tracer and
tool and of the connecting members of the machine. In actual practice the con-
tours will be convex and concave; but, as any curved line is, under the circum-
stances of engraving, a certain compound of vertical and horizontal components.
the motions of the tracer 13 and the tool post 25 will each be a similar com-
pound, the pantograph 45 and the lever 30 sharing those components between
them and compounding them in the motion of the tool 26.
In the construction illustrated in Figure 3, the invention remains exactly the
same as in the construction just described. There are the same functions and
the same means for enabling the machine to discharge them, the only difference
being the transference of the tool's capacity for lateral motion to the work table.
For that reason, those organs in Figure 3 which are the counterparts.in all
respects of organs in Figures 1 and 2, are marked with the same reference and
need no further description, while those which are affected by the difference above
mentioned are marked with the same references with a superior added.
Z
14 is the work table; 223, the guide for the universal plane 232; 50, a vertical
post holding the said plane and work table fast together; and 28%, the opening
to allow of the horizontal motion of the said post. The respective organ of the
pantograph 45 is connected to the post 50 to move the work table 14. The
tool post 25 has a vertical motion in a single central arm 20 which serves as
its guide. Thus the horizontal motions of the tracer 13 are transmitted by the
pantograph 45 to the work end of the machine in exactly the same way and with
the same effect on the combination of tool 26 and work 15 as in Figures 1 and 2.
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 pantograph engraving machine of devices conferring
a capacity for reciprocating vertical motion on the tracer and the tool, and a
lever adapted by having pivotal connections to both respectively, to make the tool
follow the reciprocating vertical motion of the tracer.
2. The combination with a pantograph engraving machine of a lever connected
to the tracer and to the work end of the machine; vertical guides for the tracer
and the tool to reciprocate in respectively and a lever adapted by connections to
both tracer and tool to impart the vertical motions of the former to the latter.
3. The combination in an engraving machine, of pantograph connecting the
tracer with the horizontally moving member at the work end of the machine;
tracer capable of vertical motion in fixed guides; tool capable of vertical motion
in fixed guides; universal plane for the horizontal motions of the tracer;
universal plane for the horizontal motions of the said horizontally moving member
at the work end of the machine; and lever having a fulcrum adjustable for ratio
between pattern and work, telescopic joints in its length to compensate for varia-
tions therein as well as pivotal connections to the tracer and to the vertically
moving member at the work end of the machine.
4. The combination of vertical tracer; universal plane having the tracer fast
to it; guide plate for the said universal plane capable of a reciprocating vertical
motion; guides for the said motion; vertical tool post carrying an engraving

page_text: tool; universal plane having the tool post fast to it; guide plate for the said
universal plane capable of a reciprocating vertical motion; guides for the said
motion; pantograph connected to the tracer and the tool post; and lever having
a fulcrum adjustable for ratio between pattern and work, pivotal connections to
the respective guide plates of the two universal planes above mentioned, and
telescopic joints in its length to compensate for variations therein.
5. The combination of vertical tracer; universal plane having the tracer fast
to it; guide plate for the said universal plane capable of a reciprocating ver-
tical motion; guides for the said motion; vertical tool post carrying an engrav-
ing tool and capable of a reciprocating vertical motion in a supporting bracket;
universal plane having the work table fast to it; fixed guide plate for the said
universal plane; pantograph connected to the tracer and the work table; and
lever having a fulcrum adjustable for ratio between pattern and work, pivotal
connections to the guide plate of the universal plane carrying the tracer and to
the tool post as well as telescopic joints in its length to compensate for variations
therein.
Dated this 7th day of December 1899
CHAS. S. WOODROFFE,
Chartered Patent Agent.