Improvements in Grounding-attachments for Pantograph Engraving- Machines.
Year: 1899

page_text: Date of Application, 7th Nov., 1899-Accepted, 30th Dec., 1899
COMPLETE SPECIFICATION.
Improvements in Grounding-attachments for Pantograph Engraving-
Machines.
We, JOHN HOPE, and JOHN HOPE, Jr., both of Mashapaug Street, in the City
of Providence, County of Providence, and 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 an attachment for pantograph engraving-
machines in which the cylindrical surface of calico-printers' rolls is engraved.
In this class of engraving-machines, a series of gravers are supported on
carriages which are operated to move longitudinally parallel with the roll or
cylinder to be engraved while the said roll or cylinder is rotatably moved so as to
reproduce a series of patterns. The carriages are controlled, in their longitudinal
movement, by what is termed the stylus-carriage and the roll by what is usually
termed the stylus-frame. The movement of the stylus-frame is transverse to the
roll or cylinder to be engraved and the movement of the stylus-carriage is longi-
tudinal to and parallel with the roll or cylinder. The stylus or tracer is pivotally
secured to the stylus-carriage. In following the lines of a pattern, the operator
moves the stylus-carriage and the stylus-frame and, through them and the con-
necting actuating-mechanism, moves the gravers longitudinally while also partially
rotating the roll or cylinder, thereby reproducing the usually enlarged pattern
traced by the stylus on the roll or cylinder generally on a reduced scale.
When the outlines of the pattern have been reproduced on the cylinder, the
spaces inclosed by the outlines require to be grounded, that is, filled with lines
parallel to each other and usually oblique to the axis of the cylinder. If the
enlarged pattern was ruled with these grounding-lines, this grounding, or ruling,
could be done by the same mechanism which produces the pattern; but to so rule
the enlarged pattern makes it diflicult for the operator to follow the lines of the
pattern with the stylus, therefore a separate machine is used by which the obliquo
lines of the ground are produced.
The invention consists in the peculiar and novel construction of the grounding-
attachment by which the longitudinal movement of the stylus-carriage acts to
rotate a bar journaled in bearings on the stylus-frame and provided with a pinion
in engagement with a rack which moves the stylus-frame to partially rotate the
roll or cylinder being engraved, to give to the lines the desired oblique direction,
as will be more fully set forth hereinafter.
Figure 1 is a top view showing the attachment in connection with the stylus-
carriage, the stylus frame and the pattern-table of a pantograph engraving-
machine.
Figure 2 is a view of the rack-bar and the pinion engaged therewith sup-
borted on the stylus-frame.

page_text: Figure 18 a side view, on an enlarged Beane, of the stylus-carriage showing
the connection with the spiral-bar.
Figure 4 is a longitudinal sectional view of the stylus-carriage showing tho
connections with the spiral-bar.
Figure is a front view of a portion of a pantograph engraving-machine,
showing the attachment in connection with the stylus-carriage, the stylus-frame
and the pattern-table.
Similar marks of reference indicate corresponding parts in all the figures.
In the drawing, a indicates the table on which the usually enlarged pattern is
supported: the stylus-carriage; the stylus; d- the handles grasped by the
operator by which the movement of the stylus-carriage is controlled; the
stylus-frame which is supported on the ways f secured to the frame of the machine.
The parts so far described, while they vary in construction in different panto-
graph engraving-machines, form the essential elements of all machines of this
class. The bar g, having two continuous spiral-grooves g-g', is journaled in
the bearings - secured to the stylus-frame e- at the opposite ends, and is
provided at one end, with the pinion which, in the operative position, engages
with the rack-bar g connected with the brackets secured to the ways f
or any fixed part of the machine. The ends go of the rack-bar gare provided
with two holes so that the rack-bar may be raised and secured in the discon-
nected position shown in broken lines in Figure 2. To the stylus-carriage bis
secured, by suitable screws, the bracket having the sleeve inclosing the
spirally-grooved bar 9. On the sleeve is supported, next to the bracket, the
adjustable stop-plate g; next to this, the operating-handle g10 on which the
spring-pressed ratchet-pawl g is pivotally secured. The ratchet-wheel is also
supported on the sleeve gs and held in place by the washer g secured to the end
of the sleeve g. The bracket g" is secured to the outer surface of the ratchet-
wheel and forms the support of the frame gl, an upwardly-extending pin of
which is secured in the bracket by a clamp-screw. The roller or guide 910 is
journaled in the frame g and engages with the grooves in the spirally-grooved
bar 9. The stop-plate g is provided with a segmental-slot and is secured to the
bracket by the stop 7 consisting of a bolt projecting from the bracket and
provided with a nut forming a stop. The stop gis is secured in the segmental-slot
and the two stops g and gs are adjusted to give the handle go and the pawl g
the movement required to regulate the distance between the lines of the grounding.
To enable others skilled in the art to use our invention, we will now more fully
describe the operation of the same. The spirally-grooved bar g being, by its
pinion, in engagement with the rack secured to a fixed part of the machine, and
the sleeve of the bracket g7 being secured to the stylus-carriage b, in the groove b¹
of which the post connected with the lever operating the graver-carriages rests,
the stylus, as it moves the stylus-carriage longitudinally on the spirally-grooved
bar g, rotates the same by means of the roller or guide go, thereby moving the
stylus-frame, the spirally-grooved bar journaled in hearings on the stylus-frame
and the stylus-carriage inwardly or outwardly and gives to the stylus an oblique
direction which is reproduced by the giavers. The operator moves the stylus from
one edge of the pattern to be grounded to the other, tracing a line on the pattern,
and, at the end of each stroke, the operator moves the handle g10 from the stop g
to the stops and back against the stop g" for the next line, and again moving
the stylus from one edge to the other, thereby moving the stylus through a suc-
cession of oblique lines parallel to and at equal distances from each other, which
lines are reproduced by the gravers in the grounding of the pattern and traced
by the stylus on the pattern.
We do not wish to confine ourselves to the exact construction of the pawl and
ratchet movement for the spacing of the lines herein described, as the same may
be varied or any one of the usual feeding-movements used in similar machines
be substituted.

page_text: 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: -
Claim 1. In a grounding-attachment for pantograph engraving-machines, the
combination with the stylus-carriage and the stylus-frame, of a spirally-grooved
bar journaled in bearings secured to the stylus-frame, a pinion on the bar, a rack
engaging with the pinion and secured to a fixed part of the machine, and an
adjustable guide connected with the stylus-carriage and engaging with the spiral
of the bar; whereby the longitudinal movement of the stylus-carriage on the
spirally-grooved bar operates the stylus-frame, as described.
2. In a pantograph engraving machine, the combination with the operative
elements of the machine of the following instrumentalities:-a rotatable spiral-
track, a rack and pinion operated by the rotation of the spiral-track, a guide con-
trolled by the stylus-carriage and engaging with the spiral-track, and mechanism,
substantially as described, intermediate with the guide and the stylus-carriage;
whereby a succession of parallel lines may be traced, as described.
3. In a pantograph engraving-machine, the combination with the pattern-
table, the stylus-carriage and the stylus-frame, of a rack secured to a fixed part
of the machine, a spirally-grooved bar, journal-bearings for the bar secured to the
stylus-carriage, a pinion on the spirally-grooved bar engaging with the rack,
a bracket secured to the stylus-carriage, a sleeve on the bracket inclosing the
spirally-grooved bar, a ratchet-wheel journaled on the sleeve, a guide supported
on the ratchet-wheel and engaging with the spiral-groove of the bar, a pawl and
handle engaging with the ratchet-wheel, and adjustable stops; whereby oblique
parallel lines may be traced on the pattern and engraved on the rolls, as described.
4. In a pantograph engraving-machine, the combination with the table a, the
stylus-carriage &, the stylus-frame e and the ways f, of the rack g' adjustably sup-
ported on the brackets -g, the bar g having the spiral-tracks g-g', the journal-
bearings g, the pinion on the bar g and engaging with the rack g', the bracket g
secured to the stylua-carriage, the stop-plate 2, the handle go having the pawl g
the ratchet-wheel g, the bracket 9 secured to the ratchet-wheel, the frame gl
adjustably secured in the bracket g and the roller or guide ge journaled in
the frame g; whereby the longitudinal movement of the stylus-carriage on the
bar g is changed to a diagonal direction and parallel lines may be engraved in
the patterns, as described.
Hated hi 0-1
Juousl
11 1900