Improvements in Pantograph Engraving Machines,
Year: 1898

page_text: Date of Application, 14th July, 1898-Accepted, 12th Nov., 1898
COMPLETE SPECIFICATION.
Improvements in Pantograph Engraving Machines,
We, JOHN HOPE, and JOHN HOPE, Junior, both of Mashapaug Street, in the City
of Providence, County of Providence, State of Rhode Island, United States of
America, Machinists, 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 has reference to improvements in the class of pantograph
engraving-machines used for engraving rolls and cylinders by tracing with a
stylus an enlarged pattern and reproducing one or more reduced patterns on the
roll, or cylinder.
In this class of engraving-machines, a partial rotary motion is imparted to the
roll, or cylinder, and a longitudinal motion to the gravers by the movement of
the stylus as it is moved over the enlarged pattern. The rolls, or cylinders, in
these machines, as heretofore constructed, were supported at each end on a pair
of disks having milled peripheries and the gravers were supported on carriages
moving on fixed ways. One of each of the two pairs of supporting-disks was
connected with a carriage moving transversely to the roll, or cylinder, and con-
trolled by the stylus.
In these prior machines, the roll, or cylinder, to be engraved, being supported
at each end on two disks, had four points of contact on the two pairs of
disks and two straps for rotating the roll, or cylinder, which straps, with the most
careful adjustment, were liable to draw unevenly on the milled-disks and produce
defects in the engraving by an apparently slight backlash in the carriage or the
straps.
Another defect in these machines is that the bars and carriages supporting
gravers were, owing to the space taken up by the supporting-disks, at such a
distance from the roll, or cylinder, to be engraved that the diamond or graver
holders were required to be long; some of them of complicated construction and
liable to spring, thereby producing defective designs on the roll, or cylinder.
One object of the invention is to simplify the construction of the machine.
Another object of the invention is to support the gravers closer to the work, and
Another object of the invention is to permit of the adjustment of the roll, or.
cylinder, axially so as to engrave the pattern spirally around the same.
The invention consists in the peculiar and novel construction and the combina-
tion of the parts, as will be more fully set forth hereinafter.
Referring to the accompanying drawings;
Figure 1 is an end view of our improved pantograph engraving-machine.
Figure 2 is a front view of the same.
Figure 3 is an enlarged end view of the cylinder to be engraved supported at
one end on the disk, the longitudinally-reciprocating carriages and the swinging-
arm operating the same.
Figure 4 is a transverse sectional view of the cylinder showing the supporting-
disk connected with the transversely-moving frame by which the cylinder is
rotated.

page_text: Figure 5 is a view, partly in section, showing the bar connecting two adjacent
carriages with the swinging-arm.
Figure 6 is a side view of a detail showing the arm by which two carriages
are connected to reciprocate together.
Figure is a top view showing the ends of one of the rear carriages connected
with the front carriage and the end-ways pivotally secured to the carriages,
whereby either or both may be connected with the swinging-arm.
Figure 8 is a top view showing the support for one end of the cylinder and the
swinging-arm connected with one-of the rear carriages.
Figure 9 is a top view showing the milled-disk supporting the opposite end of
the cylinder and the connection with the frame by which it is operated.
Similar marks of reference indicate corresponding parts in all the figures.
In the drawings A indicates the standard forming the support for the machine;
a ways secured to the top of the standard A and forming the support of the
table a¹ on which the enlarged pattern is secured; a² transverse ways secured to
the standard A supporting the rollers a³ a³ on which rests the end-frames a¹ a¹
connected by the rails aas on which the stylus-carriage is supported; the stylus a
is secured in a bracket hinged on the stylus-carriage a and provided with handles.
The operator, usually a woman having good eye-sight and steady hands, moves
the stylus along the lines of the enlarged pattern, and in doing so moves the stylus-
carriage a on the rails a5 a5 and the end-frames at a*, thereby producing, in
tracing, any oblique or curved line.
For the purpose of simplifying the specification, the parts indicated by the
letter a, so far described, will be referred to hereafter as the stylus-frame.
The longitudinal movement of the stylus is transmitted from the stylus-carriage
by the arm C, the free end of which is connected by a pin to the stylus-carriage,
and the transverse motion by the arm D, the free end of which is connected with
the end-frame a by means of a post projecting from the arm and having a ball-
shaped end sliding in a groove extending in a longitudinal direction, as shown in
Figure 2. Every movement of the stylus-frame in tracing the enlarged pattern
is transmitted by the arm C to the carriages and the gravers carried longitudin-
ally by the same and by the arm 1) to the milled-disk supporting and operating
the cylinder to be engraved so as to partially rotate the same.
The arched frame or standard B is secured at the opposite ends of the standard A:
it extends upward and over the stylus-frame and is provided with the rearwardly-
extending bracket B¹. The standard B is of a substantial and rigid construction
and forms the support of the roll, or cylinder, to be engraved and for the operative
parts by which the engraving of the cylinder is effected.
The arm C is pivotally connected with the vertical-shaft c secured to the
plate this plate el is provided with a way, usually a groove of dovetail section,
extending across the axial center of the vertical-shaft c: the post 2 extends up-
ward from a carriage which slides in the way of the plate and may be secured
at any desired distance from the axial center of the vertical-shaft c either out-
wardly or inwardly from this center. The relative distance of the post from the
center of the vertical-shaft to the point of the arm C in contact with the pin
on the stylus-carriage determines the proportion the engraved pattern on the roll,
or cylinder, bears to the engraved pattern traced by the stylus. The vertical-
shaft c and the plate c¹ are preferably supported on ball-bearings as is indicated
in Figure 1.
The post enters a groove in the arm ³ this arm is bifurcated at the end
where it is pivotally connected with the carriage, as is shown in Figure 2, at a
considerable distance apart to secure rigidity, for by means of the arm recipro-
cating motion is imparted to all the carriages by which the gravers are supported
and operated. The carriages 4, 5 and 6 are supported on rollers, running in the
grooves or ways, adjustably secured at their opposite ends to the end-frames B² B²
at the rear of the roll, or cylinder, E, to be engraved, and the carriage c² is similarly
supported in front of the cylinder E.

page_text: The carriages c, c³ and c6 are connected by means of the brackets co, as shown
in Figure 6 and indicated in broken lines in Figure 3. The lower ends of these
brackets are adjustably secured by a T-bolt sliding in a longitudinal way of
the carriage and the upper end is held between two adjusting screws in the
clamp also secured by a T-bolt to the upper carriage, as is indicated in Figure 3.
The carriage c may be connected with the carriage 5, near the opposite ends, by
means of the connecting-bar elo, as is shown in Figure 7, so that all the carriages
move together and are operated simultaneously by the arm c³.
It is, at times, desirable to move one or all the carriages 4, and c in one
direction and move the carriage c', on the opposite side of the roll E, in the
opposite direction. To this end, the swinging-arm ell is pivotally supported, at
its center, on the bracket 12, as shown in Figures 1, 3 and 8. On one end of
the swinging-arm c¹¹, the post c¹³, having globular ends, is held by a spiral-spring
in contact with a groove in the bracket c4 secured to the carriage 4, and a rigid
post 15, having a globular upper end, is secured at the opposite end of the swing-
ing-arm ell so that the posts c¹³ and c¹ will move through exactly the same distance
but in opposite directions. The carriages 5 and 7 are provided, at one end of
each, with the plates c¹6 having on their under side grooves extending transversely
to the ends of the carriages, as is indicated in broken lines in Figure 7. The
plates el are each provided with a set-screw c¹ having a milled-head. The ends
of these screws bear on the carriages, or a projecting part of the same, and sustain
the plates cl in the raised position when disconnected. By turning these screws c¹7,
the plates may be connected with the posts 13 and 15 on the swinging-arm ell
and, when so connected, the carriages e and will move together in the same
direction and the carriage c will move with them but in the opposite direction.
The gravers are secured to the arms c¹8 which are supported on and move with
the carriages. The arms 18 are provided with tail-pieces acted on by mechanism,
more fully described hereinafter, to control the gravers.
The roll, or cylinder, E, is supported at one end of the disk d¹ journaled in
suitable bearings in the frame b¹ secured to the top of the arched-standard B and at
the other end on the milled-disk journalled, with the adjacent disk of somewhat
smaller diameter, in bearings formed in the frame be also secured to the arched-
standard B. The roll E is supported on the disks and 2 slightly to the rear
of the perpendicular center of these disks so as to bear on the rollers at the
opposite ends. The rollers are journaled in the brackets 63 3 which are
adjustably secured to the frames b¹ and b². When it is desired to engrave patterns
spirally around the roll, or cylinder, E, the brackets, 63 63 are adjusted to support
the roll E slightly diagonally and adjust the ways on which the carriages are
supported parallel to the diagonally-supported roll, or cylinder E; and, to this
end, the ways are provided, near their ends, with the curved-slots 20, indicated
in broken lines in Figure 7, so that they can be readily adjusted on their supports.
By this construction, the whole weight of the roll, or cylinder, E, is supported on
the two disks and and the milled-surface of the disk acts with greater
force to rotate the roll, or cylinder, E, than was the case in the prior construction
in which the roll, or cylinder, was supported on four disks, two on each end, and
in which the roll, or cylinder, could not be placed diagonally so as to engrave
a spiral or spirally-disposed pattern. In the prior construction, owing to the
disposition of the weight of the roll, or cylinder, two milled-disks had to be
connected with and operated by a frame connected with the milled-disks at both
ends of the roll, or cylinder, E, which frame, owing to its length and compara-
tively short traverse, was liable to produce errors, or inaccuracies, in the partial
rotation of the cylinder, all of which is remedied by the present construction in
which a long, narrow slide moving transversely operates only one milled-disk on
which one end of the roll E rests, the other end resting on a smooth disk.
The forward and backward movement of the stylus in tracing the pattern, moves
the stylus-frame and with it the free end of the arm D inward and butward.
The arm D is secured to and extends from the arm D supported on the arched-

page_text: standard B, preferably on roller-bearings, as is indicated in Figure 2. A slide do,
provided with a post having a globular end, is adjustably secured to the arm d
usually by a T-bolt sliding in a groove such as is shown in the carriages in
Figure 3. The inward and outward movement of the stylus-frame is transmitted
by the arm D to the post on the arm on a reduced scale corresponding with the
difference in the distance of the respective posts on these arms from the axial center
on which they swing. The arm di has a longitudinal groove in which the globe-
shaped end of the post on the slide enters; the arm has its bifurcated ends
connected with the carriage d as is shown in Figure 9. The steel-bands 8 ds
are secured to the adjustable-clip 10 on one end of the carriage and to the
peripheral face of the disk d³, and the steel-band d is secured to the clip do on
the other end of the carriage d³ and to the peripheral surface of the disk d. By
the thumb-nuts d which engage with screw-threaded stems on the clip 0, the
tension on the steel-bands may be adjusted.
By moving the carriage inwardly or outwardly, the motion is transmitted to
the disk and the disk having the milled peripheral-surface and by the same
to the roll, or cylinder, E, resting on the milled-surface of the disk 2, and by
means of the arms D, d and d the forward and backward movement of the stylus.
and stylus-frame is communicated to the carriage 5 and, through the steel-bands
and the disks and ³, transmitted as rotary motion to the roll, or cylinder.
The gravers are controlled by the foot of the operator through the foot-treadle e
to the pivotal-shaft of which the lever e¹ is secured counterweighted by the
weight e; the rods e³, e and e5 are pivotally secured to the lever e¹; the rod (3
is connected, near its upper end, with the lever e6 which is secured to a rocking-
bar e pivoted in the brackets 65 one of which is secured to each end of the arched-
frame B; the rocking-bar e bears on the tail-piece of the arm or arms c¹8 to which
the graver is secured. The rod e is also secured to a lever et connected with a
longitudinal rocking-bar supported in brackets 66 66 at the rear of the machine;
two rocking-bars are shown, in Figure 1, connected by the rod e so as to be operated
together; the rod e5 is connected with a lever e which is connected to a rocking-
bar placed below the tail-end of the arm supporting the graver so that by raising
the rear end of the supporting-arm, the graver is moved away from the roll E;
the weight e acts on the lever e¹ by gravity to keep the foot-treadle e in the
raised position and holds the gravers off from the roll E to be engraved. The
operator, by pressing on the foot-treadle e, brings all the gravers into contact with
the roll E while the stylus is moved to trace the pattern, whereby the pattern is
engraved on the roll at a reduced scale.
The arm may be connected with the upper carriage c6 by extending the
shaft c and plate e as is indicated in broken lines in Figure 1.
C
Having now particularly described and ascertained the nature of our said in-
vention, and in what manner the same is to be performed, we declare that what
we claim is:
Claim 1. In a pantograph engraving-machine, the combination of the follow-
ing instrumentalities:-two disks supported in journal-bearings and forming
the sole vertical-support for the roll, or cylinder, to be engraved, brackets provided
with rollers forming the side-support of the roll, or cylinder, to be engraved,
carriages forming the support of the gravers, a pattern-table for the support of
the pattern, a stylus-frame moving with the stylus in tracing the pattern, actuating
mechanism connecting the stylus-frame with the carriages, and actuating mech-
anism connecting the stylus-frame with one of the disks supporting the roll to
be engraved whereby the pattern traced by the stylus is reproduced on the roll
as described.
2. In a pantograph engraving-machine, in combination, a standard forming
the support of the pattern-table and the stylus-frame, an arched-frame supported
at opposite ends on the standard, two disks journaled in bearings supported on
the arched-frame and forming the sole vertical-support for the roll to be engraved,

page_text: brackets having rolls forming the side-supports of the roll to be engraved, carriages
supporting the gravers, and actuating mechanism, substantiany as described,
controlled by the stylus; whereby the carriages are reciprocated and the roli
rotated, as described.
3. In a pantograph engraving-machine, two disks journaled in suitable bear-
ings and forming the sole vertical-support of the opposite ends of the roll to be
engraved, as described.
4. In a pantograph machine, the combination with the stylus-frame, of a disk
journaled in a suitable bearing and forming the sole vertical-support of one end
of the roll to be engraved, a disk journaled in a suitable bearing and having a
milled-periphery forming the sole vertical-support of the other end of the roll to be
engraved, and actuating mechanism connected with the stylus-frame and the disk
having the milled periphery; whereby the roll is supported and operated, as
described.
.
5. In a pantograph engraving-machine, the combination with the frame of the
machine and the two disks forming the sole vertical-support of the roll to be
engraved, two brackets provided with rollers forming the side-support of the
roller to be engraved, carriages supporting gravers adapted to engrave the upper
and lower part of the roll, mechanism, substantially as described, for operating
the carriages, mechanism for rotating the roll to be engraved, and a stylus-frame
for operating both mechanisms; whereby the roll to be engraved may be dis-
posed obliquely to the carriages and the pattern engraved obliquely to the axis
of the roll, or cylinder, as described.
6. In a pantograph engraving-machine, the combination with the roll E, two
disks journaled in suitable bearings to form the sole vertical-support of the
opposite ends of the roll E and the adjustable brackets 63 having the rollers d
to form the side-support of the roll E, of the carriages supporting the gravers,
and adjustable supports for the carriages; whereby the roll may be adjusted with
reference to the carriages and the carriages with reference to the roll obliquely or
parallel with each other, as described.
7. In a pantograph engraving-machine, the combination with the roll E and
its support of two carriages on opposite sides of the roll, a swinging-arm, posts
on the opposite ends of the swinging-arm, and grooved-plates secured to the
carriages; whereby the longitudinal motion of one carriage is transmitted to
move the other carriage in the opposite direction, as described.
8. In a pantograph engraving-machine, the combination with the carriages
on opposite sides of the roll E to be engraved and the graver-holders on the
carriages, of the centrally-pivoted swinging-arm c¹l, the posts 13 and c¹³ on the
arm, and the plates 16 16 pivotally connected with the carriages and adapted to
connect the carriages with the swinging-arm; whereby the two carriages are
caused to reciprocate in opposite directions, as described.
9. In a pantograph engraving-machine, the combination with the carriages c*, c³
and c, of the brackets adjustably secured at opposite ends to two carriages;
whereby the carriages are connected to move together, as described.
10. In a pantograph engraving-machine, the combination with the carriages
and located on opposite sides of the roll to be engraved and of the end-bars
c10 c10; whereby the two carriages may be connected together to reciprocate in
unison, as described.
11. In a pantograph engraving-machine, the combination with the disk d¹,
the disk d² having a milled peripheral surface, the said two disks forming the
sole vertical-support of the roll to be engraved, of the disk d³, the transversely-
sliding table d, and the steel-straps de 8 and 9 each secured at one end to
the table and at the other end to the disk d³; whereby the roll to be engraved
is operated at one end by the disk forming the sole support of that end, as
described.
12. In a pantograph engraving-machine, the combination of the following instru-
mentalities:—a standard forming the support of the pattern-table, ways for the

page_text: support of the stylus-frame, an arched-frame supported at opposite ends on the
standard and extending over the stylus-frame, two disks journaled in bearings
supported on the arched-frame and forming the sole vertical-support for the roll
to be engraved, adjustable brackets having rolls forming the side-support of the
roll to be engraved, carriages moving on ways adjustably secured to the end-
frames, arms supporting the gravers carried on the carriages, a stylus-frame, a
stylus-carriage on the stylus-frame, a transversely-moving table connected with
and operating one of the supporting-disks for rotating the roll being engraved,
mechanism connecting the stylus-frame with the transversely-moving table, mechan-
ism connecting the stylus-carriage with the graver-carriages and the mechanism
connecting the foot-treadle with the rocking-bars controlling the gravers; whereby
the carriages supporting the gravers may be placed closer to the roll being engraved
to form a more rigid support for the gravers and the roll being engraved is con-
trolled at one end, as described.
Haseltine, Lake & Co.,
JOHN HOPE.
JOHN HOPE, JUNIOR.
45, Southampton Buildings, London, W.C., Agents for the Applicants.