Improvements in Engraving Machines.
Year: 1899

page_text: Date of Application, 5th July, 1899
Complete Specification beft 5th Mov. 1900.
Accepted
SCIL Lu 1000
PREUNAL SPECIFICATION.
Improvements in Engraving Machines.
We, WILLIAM HENRY LOCK, Manager and Secretary of The Linotype_Com-
pany, Limited, of No. 188, Fleet Street, in the City of London, and PHILIP
CHARLES LAWLESS, of the same address, Engineer, do hereby declare the nature
of this invention to be as follows:-
The present invention relates to improvements in engraving machines, more
especially in those which are adapted to engrave punches, type matrices and
medals.
Q 21
The Specification of Letters Patent 11894 of 1885, describes a machine in
which the tracer rod is suspended from a point over a fixed pattern and the
work and cutter are together adjustable between the point of suspension and
the pattern. The operator sits, at his work with his eye upon the pattern and
the work above his head, so that both are not in sight together. One object
of the present invention is to produce an engraving machine whose tracer rod
has both pattern work and cutter about its axis, but so positioned that both the
pattern and the work are together under the operator's eye. That'object is
achieved as follows. The pattern is supported by the frame of the machine
intermediate of the top and the base of it, and the cutter frame and the work
table are both between the pattern and the machine base, thereby cutting the
tracer rod in two. The top portion of it is held in position from the top of the
machine frame and reaches down to the pattern. The bottom portion of it
rests by its lower end on or near the machine base. Both portions are capable
of lateral motion in any direction from or on their points of oscillation; the
two points being vertically in line with each other. The said bottom portion
is continued upwards through the work table and to within a convenient dis-
tance of the pattern where it is divided into as many subsidiary rods as is con-
venient. These subsidiary rods are bent outwards to clear the pattern and
carried upwards past it. They are then bent inwards and connected to the
top portion above mentioned mid-way of its length. The length of the bottom
portion of the tracer rod from its centre of oscillation up to its connection
with the upper portion is equal to the length of the top portion of the said rod,
so that the ratio between the pattern and the work in respect of size depends
upon the position of the work table with reference to the pattern.
The top of the said top portion is connected to the machine frame by any
type of joint which will permit of the tracer point moving over the pattern and
keeping in the same horizontal plane, without making the distance between
the point at which the bottom portion of the rod is connected to the top portion
thereof and the centre of suspension, less than the distance between that point
and the tracing point. Preference is therefore given to a circular diaphragm
or cross of elastic material, horizontally supported by having its outer edge
or edges made fast to the machine frame and having the end of the top portion
of the tracer rod made fast to the centre of it, A substitute joint of the ball

page_text: and socket type is a ball fast on the rod and having its cup capable of sliding
in a vertical tube fast on the frame.
The connection between the top and bottom portions of the tracer rod is by
means of a diaphragm substantially like the one just described: The edge of
it is made fast to the bottom portion of the rod, ie, to the adjacent ends of the
inwardly bent divided rods above described, and the said top portion is passed
through the centre of it. The diaphragm is made fast to the rod by two hemi-
spherical nuts fast thereon gripping the diaphragm between them, the grip-
ping surfaces of both nuts being convex so as by limiting the area of diaphragm
gripped, not to limit the flexibility of the latter. The sphere produced by the
two nuts rolls within a hollow sphere provided by two cups supported by the
adjacent ends above mentioned. Between each nut and its cup, there is an
antifriction device consisting of a ring of balls and a solid ring above and below
it, to keep the centres of all the balls of a ring, in the same plane. The cups
can be moved towards each other to take up wear.
The cutter frame is fitted with as many cutters, as may be, desired. Its
detailed construction as well as the means for driving- the several cutters. are
of any suitable kind: It stands clear of the bottom portion of the tracer, rod
and is adjustable vertically upon the machine frame.
5
The work table is of the double slide type and is likewise adjustable vertically
upon the machine frame. It is connected to the bottom portion of the tracer
rod by a diaphragm joint, or its equivalent, such as those described above, pre-
ferably like the one described as connecting the top and bottom portions of that
rod together, but the central ball or two hemispherical nuts, is loose on the
rod. The diaphragm is generally in the same plane as the work table or only
a little above it, and the two are made fast to each other. But the desired
ratio of reduction may require that the diaphragm be as near to the pattern
as possible. To enable it to be fixed in that position, it is detachable from the
work table and moveable up the bottom portion of the tracer rod, a suitable
packing being inserted between the diaphragm and the work table and the
three made fast to each other. A suitable device is provided for fixing the
diaphragm to the tracer rod in any position. The plate that carries the work
has special ball races between it and the work table. Each row of balls is con-
tained within a frame consisting of four parallel rods standing at right angles
with each other and joined together by their ends. These rods stand in grooves
or the like, to let the balls and the respective races reach each other between
them. There may be substituted for the above frame, a bar slotted length-
wise to receive a set of balls which will project above and below to reach the
plates of the slide between which plates the bar lies flat. There is or may
be a spiral cushioning spring between each end ball and the respective end
of the frame.
The bottom portion of the tracer rod terminates in a ball which is supported
in a cup vertically adjustable in the base of the machine. The ball may be
replaced by a hemisphere supported in the cup and a diaphragm fast to the rod
and also to the machine frame.
All the diaphragms mentioned herein are preferably corrugated concentri-
cally; and where they are gripped, their edges are bent at a suitable angle
and entered into corresponding grooves in the gripping surfaces to prevent
any motion of withdrawal being set up. They may be slotted radially, their
centres and edges being left intact.
1
A further object of the invention is the mounting of the tracer point on the
tracer rod in such a way that the side of it in contact with the edge of the
pattern, shall be more or less alignable with the axis of that rod: This object
is attained by mounting the tracer point so as to oscillate upon a ball and socket
or equivalent joint in the end of the tracer rod and limiting the amount of
oscillation of that point, to half the diameter more or less, of the tracer point
itself, measured in the plane of the contact thereof with the pattern. The

page_text: tracer point may be a prolongation from the closed end of a socket which is
pivotted by that end upon the end of the tracer rod. The pivotting device
may be any flexible joint, ball and socket, diaphragm or otherwise. But a
diaphragm joint is preferable because it cannot turn. The socket stands out-
side the tracer rod and extends up it for some distance. The bore of it is tapered
upwards from the joint and outwards from the tracer rod to the proper angle
for the engagement of it with the said rod on any side of the latter to keep the
point of contact between the tracer point and the pattern, axially aligned with
the axis of the tracer rod, so that when the said point is pressed against the
side of the pattern, the socket is rocked over and aligns the tracer point as
described. According to a modification, the ball joint is. between the tracer
rod and the top of the socket. The tracer joint is fast on the bottom of the
socket, and the top of it stands within a circular cavity in the bottom end of
the tracer rod, which cavity is the limiting device for the oscillation of the
tracer point. The tracer point may oscillate in a joint in the end of the tracer
rod and carry the socket with it, the latter riding upon a suitable convex sur-
face fast to the tracer rod. The surface on the rod with which the cup contacts
to stop its oscillation may be adjustable on the rod. The socket may be parallel
or tapered internally and be moved upon an enlargement of the tracer rod in
lines at right angles with the axis of the latter instead of with an oscillating
movement. An aligning device may contain a capacity for setting the point.
of contact between tracer point and pattern, out of alignment with the axis
of the tracer rod, by an amount equal to half the diameter of a cutter cutting
with its side as distinguished from one that cuts with its point, subject however
to the ratio between the pattern and the work. The tracer rod carries a device
above the socket, which can be placed between them to keep the socket con-
centric with the said rod. This device is, preferably, a screw-threaded nut
working on a screw-thread on the tracer rod, or it may be a sleeve adjustable
on the rod by a screw-thread holding the socket concentric and allowing the
latter to rock by presenting an annular groove to the top edge of the said
socket inwardly turned to enter the said groove. This annular groove and
inwardly turned edge may replace the above described internal taper of the
socket.
The bottom portion of the tracer rod is made telescopic longitudinally by
the following means. It is tubular for some distance upwards from its bottom
end and a supplementary rod is fitted therein. This supplementary rod will
carry the tracer point. The top of it carries lugs which project laterally
through vertical slots in the sides of the tubular portion already described.
This is screw-threaded externally to take a nut to which the lugs are loosely
connected in such a way that as the nut is screwed up or down the tubular
portion, it will turn round the set of lugs but take them with it vertically.
'The improvements described above enter into the construction of a two dimen-
sion engraving machine, that is one whose tracer point and cutter move in any
direction along one plane; or, in other words, one that deals with flat areas
only. A further part of the invention relates to improved means for enabling
an engraving machine to deal with a third dimension, such as the contours. of
a medallion. In carrying this last mentioned part of the invention into effect,
the pattern and the cutter frame are each adjustable vertically upon a frame
or piece which is itself capable of a reciprocating vertical motion upon the
respective part of the machine frame. Each frame or piece slides in or through
suitable guides fast on the machine frame, which guides are fitted with cushion-
ing springs: adjustable according to the weights which they may respectively
have to carry. A frame may advantageously be Y-shape, each of its three
ends being connected to the machine frame by a vibratory diaphragm held to
the said frame by its edge and having the respective end made fast to its centre.
These vibratory diaphragmus may be replaced by vertical slides or guides of
any suitable type, and a frame may, however be of any convenient shape. The

page_text: pair of frames or pieces stand side by side at a suitable distance from each
other. They are connected by a horizontal rod, or rocking frame, the ends of
which are joined to the respective frame or piece above described by vibratory
diaphragms in the same way as one of the above mentioned three ends of a
frame, is joined to the machine frame. A ball joint through which the rod
or frame end or ends can slide, may be substituted for each vibratory diaphragm.
This horizontal rod or rocking frame acts as a lever. Its fulcrum is adjustable
upon the said lever according to the desired ratio between work and pattern.
This fulcrum may consist of a vibratory diaphragm or diaphragms whose outer
edge or edges are held to the machine frame; and is adjustable upon it, the
lever passing through the centre of the said diaphragm or diaphragms.
Instead of fastening a rod end or a frame end to the middle of a diaphragm,
as mentioned above, the diaphragm may be duplicated, the two being held
together at their centres, and the outer edge of each to the machine frame and
rod or frame, as the case may be.
Special mechanism of any suitable type, such as a lever, is provided for
moving the pattern up or down its frame or piece, to enable the contour to follow
the tracer point and for holding it at any desired level.
Dated this 5th day of July 1899.
CHAS. S. WOODROFFE,
Chartered Patent Agent.
Improvements in 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 PHILIP
CHARLES LAWLESS, of the same address, Engineer, do hereby declare the nature
of this invention and in what manner the same is to be performed; to be par-
ticularly described and ascertained in and by the following statement:-
The present invention relates to improvements in engraving machines.
Referring to the accompanying drawings which are to be taken as part of
this specification and read therewith:-
Figure is a front elevation of a machine made according to the present.
invention, having the front right hand leg broken away to shew the cushioning
device in section behind it :
Figure 2 is an elevation looking at Figure 1 from the right hand, the major
part being in section:
Figure 3 is a side elevation of Figure 1 from the left hand:
Figure 4 is an inverted sectional plan taken on the line 4-4 of Figure 3:
Figure 5 is a sectional plan on the line 5-5 of Figure 2:
Figure 6 is a plan of the machine: .
Figure is a sectional plan on the line 7-7 of Figure 2, omitting some
details of the third dimension mechanism;
Figure 8 is a sectional plan on the line 8-8 of Figure 2:
Figure 9 is a detail on an enlarged scale on the line 9-9 of Figure 6:1
Figure 10 is a vertical section of the bottom end of the tracer rod:
:
Figure 11 is a sectional side elevation of a modified bottom end of the same
rod:
Figure 12 is a sectional side elevation of another modified bottom end of the
same rod:
•
Figure 13 is a plan taken on the line 13-13 of Figure 10:

page_text: པས་ཡ་5 བས་པ་
Figure 1:
Figure 15 is a detail elevation of the clamping core of Figure 14:
Figures 16 and 17 are, respectively, plan and side elevation of the supporting
collar that bears the weight of the rocking rod:
Figure 18 is a plan of a flexible diaphragm:
Figure 19 is a sectional elevation on line 19-19 of Figure 18:
Figure 20 is a plan of a modified diaphragın:.
Figure 21 is a sectional clevation on line 21-21 of Figure 20:
Figure 22 is a perspective view of the bottom end of the tracer rod of
Figure 12, the pattern, and the pattern .table:
Figure 23 is a perspective view of a matrix cut from the pattern of Figure 22:
Figure 24 is a perspective view, partly in section, of the work table:
Figure 25 is a perspective view of a ball guard of the work table:
Figure 26 is a detail, sectional elevation on an enlarged scale, illustrating the
ball-joint connecting the tracer rod to the rocking rod:
Figure. 27 is a plan of Figure 26:
Figure 28 is a detail sectional elevation on an enlarged scale, of a modified
form of the ball joint illustrated in Figures 26 and 27.
1 is the base of the machine and 2, a standard conveniently semi-circular in
cross section, having its foot securely bolted to the base 1 and its top arched.
over towards the front as shewn in Figures 2 and 3. 3 is a pattern which
the tracor rod has to follow. It is held by screws 3 upon posts 4 standing
up from the horizontal table 5 as shewn in Figures 22. This table 5 is carried
by a bracket piece 5" held by bolts 5b to a vertical plate 5-sec Figures 1 to 4.
6, 6 are bolts holding the bracket piece 5* to rods 7, 7 which for the purpose
of this part of the specification dealing as it does only with lateral motion of
the tracer in a horizontal plane, may be regarded as held fast to the frame, 1
and 2, of the machine:
39 is the tracer rod. It is held in working position by its top end from the
top of the standard 2 by any type of joint that will permit of the point 45 of
the tracer rod 39 moving over the pattern 3 horizontally and in regular contact
therewith. There is combined with the said joint, a device for keeping the
tracer point 45 down upon the pattern 3. This device consists of a spring 44
resilient between a shoulder on the tracer rod 39 and a shoulder 43 on a screw 41
adjustable vertically through the top of a cup 42 fixed upon the forwardly pro-
jecting top of the standard 2 as shewn best in Figure 2. The joint illustrated
in the said figure is a circular metallic diaphragm 40 to the centre of which
the rod 39 is made fast and which has its outer edge is or may be pinched
between the cup 42 and the top of the above mentioned forwardly projecting
top of the standard 2. The detailed construction of the diaphragm 40 as well
as that of the other diaphragms in the machine is described further on.
The lateral motion of the point 45 of the tracer rod 39 is communicated to
the work table by the special means next described. 46-Figures 1, 2 and 3–
is a rocking rod having its bottom end made fast to a diaphragm 47 vertically
underneath the connection of the top of the tracer rod 39 to its diaphragm 40.
The edge of the diaphragm 47 is pinched between a cup 48 and a ring 49. Both
the latter are carried by a bracket 50 which is holted to the standard 2. The
top of the rod 46 is made fast to a crosshead 91 situated beneath the pattern
table 5. 56, 56 are two vertical rods led symmetrically from the respective
outer ends of the cross piece 91 and having their top ends connected by a second
cross piece 57 which serves as the frame for an universal joint, the function of
which is to connect the rocking rod 46 to the tracer rod 39, as shewn in
Figures 1, 2, 3, 5 and 6. The details of this universal joint are shewn in
Figures 26 and 27, in which 58 is a ball fast on the rod 39; 59, the lining in
the cross piece 57 to receive a ring of balls 60 which are held up to the under-

page_text: side of the ball 58 by a loose ring '61 fitting up to the internal face of the lin-
ing 59 and capable of moving over it as the rod 39 moves laterally:
The weight of the tracer rod 39, is supported solely by the joint 58 and not
in part even by the diaphragm 40 or its equivalent, the function of which is
only to keep the top of the rod 39 central and to admit of the up-and-down
motion of its moving up and down as the point 45 moves laterally over the
pattern table 5.
83 is a screw working vertically through the cup-48 to set up the rod 46.
The bottom end of the latter is convex and rests and rocks in a correspondingly
shaped cup seated upon the top of the screw 83.
38 Figures 1, 2, 3, 7 and 24-is the work table. The rocking rod 46 is
operatively connected to it by means of a ball-cup joint 51 of the construction
illustrated in Figure 26. This ball 51 is adjustable vertically on the rod 46.
It is split in the same direction and screw-threaded externally as shewn in
Figure 2. 51 is a nut to grip it tightly to the rod 46 by nipping the split
parts thereto. 53 is a cup having a ball bearing on which the ball 51 sits.
The detailed construction of the ball bearing just described is substantially the
same as that illustrated in Figures 26 and 27 and described therewith and
also with that illustrated in Figure 28 and described further on. Thus, the
flange of the cup 53 rests upon a flat, round, and slightly flexible metal plate 52
-see Figures 2, 3 and 7-which has an annular V-ridge 54 on its under face,
and which ridge 54 engages in a groove 55, Figure 24, in the top slab 66 of
the work-table 38. This latter is of the double-slide type as illustrated in
Figure 24. 66 is its top slide and 67 the bottom one. The thin plate 52 des-
cribed above, is generally in the same plane as the work table 38, or only a
little above it. In any case the desired ratio of reduction between pattern
and work may require that the plate 52 be as near to the pattern 3 as may be
practicable. To enable it to be fixed in that position, it is detachable from
the table 38, and moveable up towards the rocking rod 46 by means of a suitable
ring packing 75-see Figures 16 and 17-which is inserted between the plate 52
and the table 38. A ring 75 has V-groove 76 to receive the ridge 54 and a
V-ridge 77 to engage in the V-groove 55.in the top plate 66 of the table 38.
78 is an opening from the top to the bottom of a ring 75 to allow of it passing
the rod 46.
There are special ball races 82-Figure 25-between the above described
top plate 66 and the bottom plate 67 of the work table 38, and likewise between
the said bottom plate 67 and the bracket 68. Each row of balls 79 is contained
between a pair of parallel bars 80, 80, thinner than the diameter of the balls
and joined at their ends by end pieces 81. The pairs of bars 80 fit between the
two plates 66, 67, and between the plates 67 and the bracket 68, the end pieces
81 fitting in and closing the ends of the ball races 82. The pairs of bars 80
are shorter than the respective plates 66 and 67 as the case may be.
The table 38 is as a whole adjustable vertically upon the machine frame 2
by being carried on a bracket 68 Figures 1, 2, 3, 7 and 8 having a double
V-piece sliding in a corresponding groove 70, a nut 71 fast to the piece 50
and in which works a screw 72 turning with longitudinal advance. The
bracket 68 has the grooves 70 integral with it. They embrace the piece 69
which is fast to the piece 50. The nut 71 is held stationary by being 'bolted
to the pieces 69 and 50.
37 Figures 1, 2, 3, 6 and 14-is the tool frame. It is fitted with as many
tools 62 as may be desired. Its detailed construction as well as the means for
driving the several tools 62 are of any suitable kind-one arrangement for the
purpose is described further on. This frame 37 stands clear of the bottom por-
tion 46 and in front of it and is adjustable vertically upon the rods 63, 64, by
sockets 65 and set screws 166. The rods 63 and 64 are fast by their top and
bottom ends respectively to the bracket 19 and the base 1 by diaphragms illu-

page_text: strated in Figure 9 and further on and cushioning spring devices 9, 10, described
with reference to Figures 1, 2 and 3.
The pattern table 5 is adjustable for vertical motion to and from the tracer
point 45 by being clamped as shewn at 6 in Figures 1 and 2 on two vertical
rods 7, 7. The bottom end of each rod is in a socket 8, 8 on the base 1; as
shewn in Figure 3. 9 is a collar vertically adjustable on both rods; and 10,
a cushioning, spring. around each rod and resilient between the respective
socket 8 and collar 9. The top end of each rod 7, 7, see Figure 9-is screwed
into a cup 12. This cup 12 has an annular groove 13 in the inner face of its
vertical side, adapted to receive the beaded edge 14 of a circular flexible dia-
phragm 15. 16 is a dished ring fitting within both the cup 12 and the edge 14;
and 17, 17, are screws turning in the bottom of the cup 12 to force the ring 16
upwards so as to retain the diaphragm edge 14 between the said ring 16 and
the overhanging lip 18 formed on the inner edge of the cup 12 by the groove 13,
and also to keep the diaphragm reasonably tight.
19 Figures 1, 2, 3 and 9-is a bracket bolted to a flange 20 on the standard 2
as shewn in Figure 2. The shape of this bracket in plan is shewn in Figures
and 6. 21-see Figure 9-is a second circular flexible diaphragm held to the
under side of the bracket 19 axially above each diaphragm 15 by having its
beaded edge 22 retained between a dished-out ring 23 and a second ring 24
both of which are held fast to the underside of the bracket 19, by adjusting
screws 25, in the same manner as described with reference to the pair of dia-
phragms 15. 26 is a distance piece between their centres, and 27 is a central
bolt and nut holding them by their centres to the respective sides of the said
distance piece 26. 9 is a hole in the bracket 19 to give access to the bolt
and nut 27, and 30 is its closing plug.
The diaphragms referred to in this specification may be of any convenient
construction. Those illustrated in Figure 9 are plain flat discs having a hole
in the centre and a beaded edge. According to the constructions illustrated
in Figures 18, 19 and 28, the disc is slit radially from its outer edge up to an
annulus 31 concentric with the central hole 32, so producing a number of
rays 33, each of which is twisted through.half a circle as indicated by Figures 18,
19 and 28. The outer end of each ray is then bent round a beading wire ring 34
by any suitable means. According to the construction illustrated in Figures 20
and 21, the disc has slits 35 extending inwards from the outer edge up to the
annulus 31. 36 are shorter slits likewise extending inwards from the outer edge
and interspacing the slits 35. The hole 32, and the annulus 31, are substan-
tially the same as illustrated in Figures 18 and 19. The rays 33 are flat, and
their outer ends are bent round a beading wire ring 34.
87 Figure 1 is a bar pivotted by two links 88, 88, on two fixed points 89, 89,
on the underside of the bracket 19 as shewn best in Figures 1 and 5. 90, 90,
are a pair of lugs projecting from the bar 87 and standing one on each side of
the horizontal piece 91 that connects the two subsidiary rods 56 already described
near their ends they rest on projections 91. When the tracer rod as a whole is
moved, four hemispherical projections 92, 92, 92, 92, on the piece 91 rub over
the internal vertical faces of the lugs 90, so that the tracer rod is still free to
move in any direction but not to turn on its axis.
The tracer point 45 on rod 39 is capable of being moved by hand horizontally
or vertically independently of red 39. For the horizontal movement, three
means are shewn, in Figure 10 is a diaphragm joint arrangement, in Figure 11
a ball joint is used and in Figure 12 a horizontal sliding connection is made
The object of this horizontal movement of the tracer point independent of
the tracer rod is to carry the centre line of the rod suitably near the edge of the
pattern plate, otherwise a line drawn through the tracer rod would not pass
through the boundary of the pattern. In order to regulate the above horizontal
movement to suit different diameters of cutters and ratio of reduction, the cup.

page_text: piece 95 is allowed to come in contact with the conical nut 97 which latter can
be screwed up or down to allow of the required horizontal movement. Regard-
ing the vertical movement of point. 45 it is sometimes desirable that the centre
line of the rod 39 should pass, not at the edge but take a position more or less
central of the pattern plate and when commencing an operation, to do this
systematically a cone 45ª is provided at the lower end of above mentioned
cup 95. This cone ends in point 45 wliich is hemispherical. The three last
mentioned parts are fast together and are connected to an internal rod 101
which can be lowered by turning the ball 106. This has the effect seen in full
lines in Figure '22.
Referring to Figure 10 the diaphragm 96 is held by its edge and can be
tightened in its place similarly as other diaphragms mentioned in this specifi-
cation, a ring of lead wire 95b is used to take up unnecessary pressure on the
diaphragm when screwing it up in position by nut 95. Rod 101 is connected
at its lower end to diaphragm 96; rod 39 is bored out to receive rod 101: the
latter has tightly fixed in its upper end two short pieces 102, 102, which extend'
through slots 103, 103 their length is greater than the diameter of rod 39.
Pieces 102, 102, are screwed at their ends to engage nuts 104, 104, these nuts
when in position as shewn are screwed against each other and thereby wedgo
the pieces 102, 102, against the ends of the slot 103 of the inner rod, they being
still free to move up or down the longer slot in rod 39. It will be noted that
rings 104, 104 are free of the outer rod 39.
The ball 106 screwed on the rod 39 encloses in it the rings 104, 104, and they
are kept there by the closing ring 107 which is screwed into ball 106, when it
is screwed home it still leaves ball 106 free to turn on rod 39 not binding on
the rings 104, 104. Therefore, in turning it carries them along the rod 39.
Referring to Figure 11, the construction and action of the modification illus-
trated therein, is substantially the same as that just described. For that
reason the same references are used. The only difference is that the diaphragm
is replaced by a ball and socket joint 99.
In Figure 12, a horizontal sliding connection of the tracer point on the tracer
rod 39 is shewn. A fixed collar 99 on the end of the rod 101 is enclosed in
the cone 45 by a cup-shaped piece 95 and 100. The screw 98 is on rod 101,
and carries the nut 97 which can be screwed up or down it in order to give
the desired play to cone 45ª and its point 45. The means of raising and lower-
ing this cone is similar to that shewn in Figure 10 already described. The
above tracer points are used for very fine work and good work may be done by
using a tracer point made in one with the tracer rod 39, or by using the above
horizontal sliding joint connected direct to it without using an inner rod 101
at all. Referring to Figures 6 and 14, 62 is the cutter to revolve with the
cutter-holder 130 and spindle 129 within the core 128, the latter is held by
screws 126, 126. The core is screw-threaded on the outside about its centre
to engage screw-thread 132. It is also provided with openings 133 to allow of
clamping the sides and thereby adjusting for wear by the cone nuts or rings 120
and 121 which engage it; they are also screwed to suit above thread 132.
To regulate the length of cutter 62, a lock nut 123 screw-threaded to engage
screw on spindle 129 is placed it is provided with an arm 122 which can
engage notches on flange 127 which latter is made fast to the spindle 129. A
milled spherical nut 131 is used to draw up tool-holder 130 within spindle 129.
The upper portion of 129 is provided with a fast and loose pulley each having
two V-grooves. The loose pulley only acts as a convenient means of conducting
the circular belting 135 to that side of the next pulley which will drive it in the
required direction. Therefore, alternately the 12 pulleys 124 and 125 are made
fast and loose on six spindles 129 mounted on tool frame 37. Three of the
lower pulleys 124 are driving pulleys and three of the upper pulleys 125 are
also, the rest are loose. Two endless circular belts 135 are driven by pulley 136

page_text: provided with three grooves the centre one for connection with a motor belt
as shown in Figures 1, 3, 6 and 7 mounted on bracket 138. The latter is held
in position and is adjustable horizontally and vertically on upright bar 139.
137 is a pulley with two V-grooves mounted on bracket 142, it is held in a
similar manner to upright bar 140, as bracket 138 is held to 139, in addition a
hand lever 142ª connected to a screw bolt for clamping bracket 142 is .shown.
Double V-pulley 141 is mounted on frame 37 in order that cord. belting 135
will better grip pulley next to it. The object of the above double cord belt 135,
as described, is to reduce friction on the cutter spindles. It will be noticed that
the pressure on one side of spindles 129 is counteracted by the pressure on the
opposite side by belt 135 engaging the spindle pulleys at opposite sides only.
The improvements described above enter into the construction of a two dimen-
sion engraving machine, that is, one whose tracer point and tool move in any
direction over a horizontal plane; or in other words one that deals with flat.
areas only. A further part of the invention relates to improved means for
enabling an engraving machine to deal with the cameo and intaglio contours
of a medallion as already stated. In carrying this last mentioned part of the
invention into effect, the pattern table 5 and the tool frame 37 are cach adjust-.
able vertically-Figures 1, 2, 3 and 8, the former upon the rods 7 and the
latter upon the two rods 63 and 64, which four rods, as already explained, are
capable of a reciprocating vertical motion upon a special frame, by means of
the diaphragms illustrated in Figure 9, and the springs 10 illustrated in
Figures 1, 2, and 3. These springs are adjustable as already explained, accord-
The special
ing to the weights which they may respectively have to carry.
frame above mentioned consists of two T-shaped pieces 110, cach of which has
its three ends connected to the machine frame by flexible diaphragms 111 of
the construction already described. These diaphragms may be replaced by
vertical slides and guides. The two pieces 110 stand side by side at a suitable
distance from each other and are connected by a horizontal rod 112, the ends
of which are connected to the respective frame by a flexible diaphragm 113.
A ball joint through which the rod 112 or the ends of the rod 112 can slide may
be substituted for each flexible diaphragm. This horizontal rod acts as a rock-
ing frame or lever. Its fulcrum is adjustable according to the desired ratio
between work and pattern. This fulcrum consists of a flexible diaphragm 114
held to the slide 115 working in a guide 116 on the base 1 and capable of being
traversed horizontally by means of a screw 117.
It is therefore seen that any vertical motion imparted to one frame 110 curry-
ing table 5, a similar motion is transferred to frame 110 carrying tool frame 37,
but, in the opposite direction owing to the connection of the two frames 110, 110
by rod 112 held by its fulcrum 114. In operating the machine, the uneven
face of the pattern, say a medallion, must be followed by the tracer point 45,
the latter only moving horizontally; the pattern table must be lowered and
raised therefore, and, not the point 45, by so doing the tool frame, is moved
correspondingly. To effect the above, 83 is a link from the middle of the bracket
back 84 of the pattern table 5 to the end of the hand lever 85 having a fulcrum
in a bracket bolted on bracket 19 for the purpose of operating the machine
by hand:
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 improved engraving machine as above described and illustrated in
the accompanying drawings.
2. The combination of an improved flexible diaphragm with its respective
rod and holding rings, as herein before set forth.
3. The improvement in a tracer rod and its point illustrated in Figures 10
to 13 and described therewith.

page_text: 4. The improvement in a tracer rod and its point illustrated specifically in
Figures 10 and 13 and described therewith.
5. The improvement in a tracer rod and its point illustrated specifically in
Figure 11 and described therewith.
6. The improvement in a tracer rod and its point illustrated specifically in
Figure 12 and described therewith.
1341
1000
CHAS. S: WOODROFFE, .
Chartered Patent Agent.