IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR THE MANUFACTURE OF SPOOLS OR BOBBINS
Year: 1883

page_text: LETTERS PATENT to Frank Wirth of the firm of Wirth and Company,
Patent Solicitors, at Frankfort on the Main in the Empire of Germany for an
Invention of IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR THE
MANUFACTURE OF SPOOLS OR BOBBINS "a communication from Albert Abegg
a person resident at Laufenburg in the Empire of Germany"
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 2nd March 1883.
FRANK WIRTH of the firm of Wirth and Company Patent Solicitors at Frankfort
on the Main in the Empire of Germany "IMPROVEMENTS IN THE METHOD OF
AND APPARATUS FOR THE MANUFACTURE OF SPOOLS OR BOBBINS."
a communi-
cation from Albert Abegg a person resident at Laufenburg in the Empire of
Germany.
This Invention relates to the manufacture of impermeable, durable, and perfectly
true spools or bobbins of the kind known as Rabbeths'.
Heretofore such spools or bobbins when made of paper have not been durable
and good, but by this Invention most of the defects are remedied.
The spools or bobbins are made of paper tapes or strips coated with blood
albumen soaked for 10 hours in water and strained. The coated paper strips are
coiled on a mandrel and finished in the usual way. Egg albumen is used for
glueing the pins into the spools, and for this purpose is preferable to blood albumen.
If the spools be dry, they are placed in a steam chamber and subjected for 15 to.
20 minutes to a pressure of 1 to 1%, atmospheres which may in many cases be
raised to 6 atmospheres after which they are again dried and passed to the boring
and grinding machines hereafter described, to be finished.
The true and accurate boring of the spool or bobbin is of great importance, as
otherwise it would be impossible to grind the spool, and particularly the under
part of the spool, truly concentric so that it exactly fits the Rabbeths' spindle.
The conical part of the spool which must fit into the cup of the Rabbeths' spindle,
is ground on the same machine that bores it, whereby almost mathematical
exactitude is ensured.

page_text: The boring machine consists of a rotating hollow mandrel upon which the spool
is placed and through which passes the boring spindle carrying the drill at one
extremity which projects at one end of the mandrel, and coupled at the other by a
crosshead with a sliding rod whereby the drill may be moved forwards a distance
regulated by a screw stop in order to make the pin holes in the spool exactly fit
the spindle. The spool is fixed on the front end of the mandril and the boring
tool when thus drawn forward drills the hole conical to exactly fit the Rabbeths'
spindle. The under part of the spool is now ground off by means of a grinding
roller upon a shaft mounted in bearings in a slide rest provided with proper means
of adjusting the position of the grinding roller with regard to the spool to be
ground. When the spools are thus made; they may be placed on a Rabbeths'
spindle and ground to the finished state by means of the grinding apparatus next
described.
This resembles the boring machine and comprises the rotating spindle on which
the drilled spool is placed, a slide rest in which the grinding wheel (consisting of
a steel disc covered with glass paper or similar grinding tool) is mounted, which
slide rest is provided with means of adjustment whereby the grinding wheel may
be brought up to the spool and placed at any convenient angle thereto.
Only the spools made on the above described boring machine can be ground
exactly concentric. The spools thus made do not split, uncoil, or become affected
even in moist places and run perfectly true on spindles making 6000 to 8000
revolutions a minute..
The Invention relates secondly to the manufacture of bobbins with discs or heads.
The method hitherto practised of fixing the discs or heads to spools, especially to
paper spools, has been found unsatisfactory as the discs or heads frequently become
loose or get into a slanting position. To obviate this they are screwthreaded so as
to obtain a far greater firmness and safety in working.
The paper of which the spools are made is cut in the usual manner coiled on a
mandrel, the wood pivots glued in the spools allowed to dry and screwthreads then
cut on both ends of the body of the spool in a self acting lathe, furnished with a
leading screw and slide rest by means of a sharp edged grinding disc. The discs
have screws threads similarly cut in them and are then screwed tight onto the
body and glued.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frank Wirth in the Great Seal Patent Office on the 1st September
1883.
"
FRANK WIRTH, of the firm of Wirth and Company, Patent Solicitors at Frankfort-
on-the-Main, in the Empire of Germany " IMPROVEMENTS IN THE METHOD OF
AND APPARATUS FOR THE MANUFACTURE OF SPOOLS OR BOBBINS A communi-
cation from Albert Abegg, a person resident at Laufenburg in the Empire of
Germany.
This Invention relates to the manufacture of impermeable, durable and perfectly
true spools or bobbins of the kind known as Rabbeths.
Heretofore such spools or bobbins when made of paper have not been durable
and good, but by this Invention most of the defects are remedied.:
The spools or bobbins are made of paper tapes or strips coated with blood
albumen soaked for 10 hours in water and strained. The coated paper strips are
coiled on a mandrel and finished in the usual way. Egg albumen is used for
glueing the plugs or bushings (which are made of paper) into the spools, and for
this purpose is preferable to blood albumen. If the spools be dry, they are placed
in a steam chamber and subjected for 15 to 20 minutes to a pressure of 1 to 11/
atmospheres which may in many cases be raised to 6 atmospheres, after which they
are again dried and passed to the boring and grinding machines hereafter described,
to be finished.
The true and accurate boring of the spool or bobbin is of great importance, as
otherwise it would be impossible to grind the spool, and particularly the under
part of the spool, truly concentric so that it exactly fits the Rabbeths' spindle.
The conical part of the spool which must fit into the cup of the Rabbeths' spindle,
is ground on the same machine that bores it, whereby almost mathematical
exactitude is ensured.
b
The boring machine Figure 1, consists of a rotating hollow mandrel A upon
which the spool is placed, and through which passes the boring spindle 6 carrying
the drill C at one extremity which projects at one end of the mandrel, and coupled
at the other by a cross head e with a sliding rod d whereby the drill may be
moved forwards a distance regulated by a screw stop f in order to make the pin
holes in the spool exactly fit the spindle. The spool is fixed on the front end of
the mandrel and the boring tool when thus drawn forward drills the hole conical
to exactly fit the Rabbeths spindle. The under part of the spool is now ground
off by means of a grinding roller S upon a shaft mounted in bearings in a slide
rest B provided with proper means of adjusting the position of the grinding roller
with regard to the spool to be ground. When the spools are thus made, they may
be placed on a Rabbeths' spindle and ground to the finished state by means of the
grinding apparatus Figure 2 next described.
i
This resembles the boring machine and comprises the rotating spindle H on
which the drilled spool is placed, a slide rest X in which the grinding wheel K
(consisting of a steel disc covered with glass paper, or similar grinding tool) is
mounted, which slide rest is provided with an adjusting screw O which passes
through the female screw i and is provided with the lock nuts l. By this means
the grinding wheel may be brought up to the spool and placed at any convenient.
angle thereto.
Only the spools made on the above described boring machine can be ground
exactly concentric. The spools thus made do not split, uncoil, or become affected
even in moist places and run perfectly true on spindles making 6000 to 8000
revolutions a minute

page_text: The invention relates secondly to the manufacture of bobbins with discs or heads.
Figure 3 The method hitherto practised of fixing the discs or heads to spools,
especially to paper spools, has been found unsatisfactory as the discs or heads
frequently become loose or get into a slanting position. To obviate this they are
screwthreaded so as to obtain a far greater firmness and safety in working.
The paper of which the spools are made is cut in the usual manner, coiled on a
mandrel, the wood plugs or bushings glued in the spools allowed to dry, and screw-
threads then cut on both ends of the body of the spool in a self acting lathe,
furnished with a leading screw and slide rest by means of a sharp edged grinding
disc, or the screw thread can be formed on the spool by pressure in screw dies.
The discs have screwthreads similarly cut in them and are then screwed tight onto
the body, and glued.
Having described the nature of the said Invention and the manner of performing
the same I declare that what I claim as the Invention to be protected by the
herein before in part recited Letters Patent is
1 The employment of blood or egg albumen or both together for the manufacture
of paper spools as described.
2nd The steaming of these spools under a pressure of from one to six atmospheres
as described.
3rd The boring machine consisting of the hollow rotating mandrel A and boring
spindle b passing there-through and combined with the draw-rod d substantially
äs described and shown in the drawings.
4th The machine for polishing the spools consisting of the slide rest ✗ rotating
spindle H and polishing wheel K provided with the adjusting screw o substantially
as described and shown in the drawings.
5th A Rabbeth spool made of paper strips coiled and united by blood albumen
as described
6th The manufacture of bobbins having discs or heads, by screw threading the
body and heads of the bobbin, and screwing them together substantially as
described.
In witness whereof I the said Frank Wirth have hereunto set my hand and
seal this Twenty eighth day of August A.D. 1883.
FRANK WIRTIT Gal