IMPROVEMENTS IN THE PROCESS OF DIVIDING PEARLS, CORALS AND OTHER LIKE ARTICLES, AND IN THE APPARATUS TO BE USED THEREFOR
Year: 1884

page_text: I THEODOR GROLL, of 5 alter Markt, Frankfort on Main, Prussia, manufacturer,
do hereby declare the nature of said invention for "IMPROVEMENTS IN THE
PROCESS OF DIVIDING PEARLS, CORALS AND OTHER LIKE ARTICLES, AND IN THE
APPARATUS TO BE USED THEREFOR," to be as follows:-
•
My invention relates to the process of dividing pearls, corals and other similar
articles for jewellers work, and its object is to provide means for holding the said
articles more securely than has heretofore been possible, while they are subjected to
the cutting operation.
For this purpose I imbed the pearls, &c., by half their thickness in a plastic
mass, which is contained in a groove turned into the face of a ring, and which is
adapted to become hard by dessication or otherwise. After the said inass has
solidified, the ring with the pearls, &c., is placed in inverted position upon another
like ring, also provided with a groove filled with plastic material, and is pressed
against the same, so that the portions of the pearls, &c., projecting from the surface
of the mass in the first ring, will penetrate into the mass of the second ring; but
the rings are so arranged that, when their inner edges, or certain lugs on their inner
periphery have come in contact with each other, a slit will be left between the outer
edges through which a cutting instrument can be introduced. The two rings
having then been fastened together, the plastic mass in the second ring is also dried
or allowed to solidify. Finally the rings are screwed to a disk or face-plate to
which a slow rotating motion can be imparted, while the cutter, which may consist
in a revolving disk, or a blade of metal having longitudinal motion, is caused to
advance into the aforesaid slit. In this manner the pearls and other articles
held by means of the plastic mass and the rings, will be divided with great
accuracy.
Instead of the said rings two straight bars provided with grooves, may be
employed. With such bars the cutting operation is preferably carried out by a
revolving disk, while the bars are fed forward in longitudinal direction.
•
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page_text: COMPLETE SPECIFICATION.
I, THEODOR GROLL, of No. 5, Alter Markt in Frankfort on Main, Prussia,
Manufacturer, do hereby declare the nature of my invention for "IMPROVEMENTS
IN THE PROCESS OF DIVIDING PEARLS, CORALS AND OTHER LIKE ARTICLES, AND
IN THE APPARATUS TO BE USED THEREFOR," and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
८
My invention relates to the process of dividing pearls, corals and other similar
articles for jewellers work, and its object is to provide means for holding the said
articles more securely than has heretofore been possible, while they are subjected
to the cutting operation."
For this purpose I employ a particular kind of holder consisting of two like or
similar parts having each a groove and fitting together with the grooves opposite to
each other, but arranged to leave a narrow slit between them for the introduction
of a cutting instrument.
On the annexed sheet of drawings Fig. 1 is a plan of one part of an annular
holder seen from the grooved side. Fig. 2 is a section on.line y z of both annular
parts or rings placed upon each other. Eig. 3 shows in side view and Fig. 4 in plan
å holder consisting of two straight bars.
Referring to Figs. 1 and 2, the two rings a and b have each a groove n, adapted
to contain the pearls r, &c., to be cut, and their faces are so formed that when the
rings are put together, the slit e will be produced between the outer edges of the
grooves or between these as well as the inner edges. Preferably the rings are for
this purpose provided on their inner periphery with lugs & projecting over the face
of the rings by the amount required for the slit e. Separate distance-pieces may
also be used. By means of guiding-pins f the proper position of one ring upon
the other is ensured..
When the described holder is to be used, the groove n of the ring a is filled with
a plastic mass adapted to become hard by dessication or otherwise. Into this mass
the pearls, &c., are imbedded by half their thickness. After the said mass has
solidified, the ring with the pearls is placed in inverted position on the ring b, the
groove whereof is also filled with plastic material, and it is pressed against the
same so that the portions of the pearls projecting from the surface of the mass in
the ring a will penetrate into the mass in the ring b. The two rings having then
been fastened together, the mass in the second ring is als dried or allowed to
solidify. Finally the rings are screwed to a disk or face-plate to which a slow
rotating feed-motion is imparted, while a cutter, which may consist in a blade s,
Fig. 1, having alternating or continuous longitudinal motion, or in a revolving disk,
is caused to operate through the slit e on the pearls. In this manner the pearls or
other articles beld by means of the plastic mass and the rings, will be divided with
great accuracy.

page_text: Instead of the said rings, a holder consisting of two straight bars having a like
sectional from as the rings, may be employed. A holder of this kind is shown by
Figs 3 and 4. After the pearls have been imbedded into the same in the manner
hereinbefore described, the holder is fastened on a plate t provided with mechanism
for slowly feeding it forward beneath a rotating cutter s' and in a direction parallel
with the plane thereof, the slit e being brought in a line with the cutter, which is
adjusted to penetrate to the required depth into the same. In case the straight
holder is suitably arranged, a straight cutter may also be employed in combination
therewith.
The cutters whether consisting in a flat blade or band as in Fig. 1 or a round
disk as in Fig. 3 and 4, may be made of steel and do not require to have teeth.
Subsequent to the cutting operation the parts of the holder are detached from
each other and the divided pearls, &c., removed from the mass in which they are
immbedded.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1, The process of dividing pearls and other like articles by imbedding them in a
plastic mass contained in a bipartite grooved holder, in causing or allowing the
said mass to become hard or solidify, and in passing a cutter between the two parts
of the holder through the said mass and the articles imbedded therein, substantially
as herein before described.
2, An apparatus for carrying out the described process of dividing pearls and
other like articles, and consisting in a holder composed of two parts a and b having
each a groove n, in combination with means for producing a slit e between the parts
when put together, substantially as and for the purpose described.
Dated this Eleventh day of 'Anril 1885