Improvements in grindING APPARATUS HAVING TRAVERSING GRINDERS
Year: 1883

page_text: LETTERS PATENT to Joseph Standring Dronsfield of the firm of Dronsfield
Brothers of Oldham in the County of Lancaster Makers of Card Grinding
Machinery and Charles Butterworth also of Oldham for an Invention of
"
· Improvements in grindING APPARATUS HAVING TRAVERSING GRINDERS
PROVISIONAL SPECIFICATION left by the said Joseph Standring Dronsfield
and Charles Butterworth at the Office of the Commissioners of Patents on the
6th October 1883.
JOSEPH STANDRING DRONSFIELD of the firm of Dronsfield Brothers of Oldham
in the County of Lancaster, Makers of Card Grinding Machinery, and CHARLES
BUTTERWORTH also of Oldham, "IMPROVEMENTS IN GRINDING APPARATUS HAVING
TRAVERSING GRINDERS
"
Our Invention relates to the apparatus employed in the grinding of card
cylinders and cards and ordinarily known as the Horsfall roller. In the said
apparatus a short cylindrical grinder is traversed to and fro upon a hollow shaft
by means of an internal screw which is cut with both right and left hand threads
or grooves crossing each other. Previously to our Invention only one grinder has
been used in each apparatus. According to the first part of our Invention we
mount two or more grinding cylinders or pullies upon a hollow shaft. In practice
two grinders would be used. We mount or form the grinder blocks upon a tube
or connect them together by means of a tube or by means of rods or connecting
pieces. One of the blocks or the connecting tube or part is provided with a key
which works in the screw threads which are cut so as to impart only about half
the usual traverse. When in use each grinder acts upon about half of the width
of the card surface traversing from one edge or end to about the centre and then
returning so that by their concerted action the whole width of the carding surface
is ground or sharpened. To clean the shaft we apply rings of felt or other suitable
material in recesses in the ends of the said tube or in the blocks or we form stuffing
boxes or glands therein in a similar manner as indicated in the specification of a
former patent granted to the said Joseph Standring Dronsfield and bearing date
the seventh day of February A.D. 1870 and numbered 355.

page_text: In another construction the grinders are not connected by means of a tubo. In
such a caso the screw shaft would be cut with two or more sets of screw threads so
arranged as that each grinder would traverse to and fro upon a part of the said
shaft as for example in the case of a shaft provided with two grinders each would
traverse between one end of the shaft and the centre or about the centre thereof.
A second part of our Invention has for its object to facilitate the removal and
insertion into position of the fork which engages with the threads of the screw.
In the ordinary apparatus the said fork cannot be removed without taking the
apparatus to pieces by unscrewing one of the ends of the hollow shaft.
We ɛecure
the grinding cylinder to the block which slides upon the shaft so that the said
cylinder can be removed from the block. In the said block an opening large
enough to permit the passage of the fork is formed. The sbank of the fork is
fitted to swivel in a plug piece which is made to fit the said opening and is formed
with a part which projects into the slot in the shaft and is planed to slide therein
the seating for the shank of the fork passing through the said part. The bore of
the hollow shaft is made larger than usual as compared with the diameter of the
screw so that there is sufficient clearance to enable the fork after being passed
through the slot in the shaft to be turned into position to enter the screw groove.
The plug piece is secured by means of a set-screw or by suitable means and by
preference is turned to fit a hole bored in the block. To withdraw the fork the
grinding cylinder is removed from the block to give access to the plug piece which
is then loosened and lifted out bringing out the fork which if worn out can readily
be replaced. with a new one inserted into working position by passing the fork
head through the slot and turning it as herein before stated. The screw axle
passes out through a hollow gudgeon formed upon one of the shaft ends.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Joseph Standring Dronsfield and Charles Butterworth in the
Patent Office on the 5th April 1884.
JOSEPH STANDRING DRONSFIELD of the firm of Dronsfield Brothers of Oldham in
the County of Lancaster, Makers of Card Grinding Machinery, and CHARLES
BUTTERWORTH also of Oldham "IMPROVEMENTS IN GRINDING APPARATUS HAVING
TRAVERSING GRINDERS
"
Our Invention relates to the apparatus employed in the grinding of card
cylinders and cards and ordinarily known as the Horsfall roller. In the said
apparatus a short cylindrical grinder is traversed to and fro upon a hollow shaft
by means of a screw which is cut with both right and left hand threads or grooves
crossing each other. Previously to our invention only one grinder has been used
in each apparatus. According to the first part of our invention we mount two or
more grinding cylinders or pullies upon a hollow shaft. In practice two grinders
would be used. We mount or form the grinder blocks upon a tube or connect
them together by means of a tube or by means of rods or connecting pieces. One
of the blocks or the connecting tube or part is provided with a fork which works
in the screw threads which are cut so as to impart only about half of the usual
traverse.
In another construction the grinders are not connected by means of a tube or
rod. In such a case the screw shaft would be cut with two or more sets of screw
threads so arranged as that each grinder would traverse to and fro upon a part of
the said shaft.
A second part of our invention has for its object to facilitate the removal and
insertion into position of the fork which engages with the threads of the screw.
In the ordinary apparatus the said fork cannot be removed without taking the
apparatus to pieces by unscrewing one of the ends of the hollow shaft. We e secure
the grinding cylinder to the block which slides upon the shaft so that the said
cylinder can be removed from the block. In the said block an opening large
enough to permit the passage of the fork is formed. The shank of the fork is
fitted to swivel in a plug piece which is made to fit the said opening and is formed
with a part which projects into the slot in the shaft and is planed to slide therein
the seating for the shank of the fork passing through the said part. The screw
axle passes out through a hollow gudgeon upon one of the shaft ends.
In order that our Invention may be fully understood we have attached hereto a
sheet of drawings made to a scale of about half the real linear dimensions and
marked with letters of reference. Referring to the said drawings Fig: 1 partly in
section represents our improved grinding apparatus a portion of the hollow shaft
and screw being omitted and Fig: 2 is a cross section on the line A. In the said
Figs a is the hollow shaft in which is mounted the screw shaft b. Upon the
shaft a are mounted two grinding pullies c, c¹. The pulley c is formed with an
internal flange whereby it is secured to a block d by means of the bolts e, e the
parts being suitably turned and fitted together. This fitting of the pulley upon a
block is intended to facilitate the removal of the fork piece in accordance with the
second part of my invention and is not required when the second part is not
combined with the first part. The block d is fitted to slide upon the shaft a and
is connected by means of a bar f with the second grinder & the said bar being
formed with studs which enter holes in the block d and in the boss of the
grinder c¹ and being secured by means of screws g, g,. The said bar lies within
the slot in the shaft a and does not neccessarily project beyond the outer surface of

page_text: or
the said shaft. A thin tube or sheet metal case h extends between the two
grinders and serves principally as a shield to cover the portion of the slotted shaft
which extends between the two grinders. The connecting bar keeps the two
grinders at a constant distance apart and obviates the necessity for cutting two
sets of screw threads upon the screw shaft. The screw shaft gives motion to the
block d and this imparts a corresponding motion to the pulley c¹. The said screw
is cut with screw threads or grooves which extend from one end of the shaft to
about the centre thereof that is to say for a distance sufficient to move the grinder c
from one end of the shaft to about the centre. It will be seen that when either of
the grinders is at one end of the shaft the other grinder is at the centre or
thereabouts. When in use each grinder acts upon about half of the width
of the card surface of the cylinder or doffer which is being ground the
grinder traversing from one edge of the cylinder to about the centre and
then returning so that by the concerted action of the two grinders the whole
width of the carding surface is ground or sharpened. To clean the shaft a and to
prevent the gritty particles from getting between the shaft and the surfaces which
slide thereon we apply rings of felt or other suitable material in a recess
stuffing box i formed in the block d the said felt being kept in position by means
of a screw cover i. The pulley c¹ is provided with a similar gland or stuffing box
so that as the grinders traverse to and fro the gritty particles are pushed towards
the end of the shaft. This formation is similar to one indicated in the specification
of a former Patent granted to the said Joseph Standring Dronsfield bearing date
the seventh day of February. A.D. 1870. We may vary the method of connecting
together the two grinders as for example we may secure the ends of the tube h or
of a tube taking its place to the two grinders or blocks in which case the connecting
barf might be dispensed with. We can also vary the construction by dispensing
with a direct connection of the two grinders. In such a case we cut two distinct
sets of screw grooves in the screw-shaft so that each grinder is moved along the
shaft a by its own set of screw grooves each set being of a length sufficient to move
the grinder from one end to about the centre of the length of the shaft and back
again one grinder being at one end when the other is in or about at the centre of
the length of the shaft. We do not confine ourselves to the use of only two
grinders upon one shaft. The same Figs. illustrate the second part of our
invention. The shank k of the fork which engages with the grooves in the screw
shaft is fitted in a hole in a plug piece which is fitted into a hole which is bored
in a pap upon the block d. The said hole is made sufficiently large for the
fork to pass through it. The plug-piece is separately represented by Fig. 3 wherein
it will be seen that it is planed or cut away on each side of the bottom so as to
form a key which is fitted to slide in the slot in the shaft a and relieves the fork
from the driving strain. The shaft is made larger in diameter as compared with
the screw shaft than is usual so that there is room for the fork to be lifted out of
gear with the screw groove and to be turned around within the space between the
screw shaft and the inner surface of the shaft a. The plug-piece is held in place
by means of a set-screw m seen in Fig: 2 or by other suitable means. When it is
desirable to remove the fork the pulley c is removed from the block d whereby
access to the plug-piece is obtained. The said plug piece is then loosened and the
fork is lifted out of the screw groove and turned until it is in line with the slot.
The plug-piece carrying with it the fork can then be lifted out. If necessary a
new fork can be caused to take the place of the old fork and the plug-piece be
re-inserted in the block. The end of the shaft which does not appear in Fig: 1 is
represented partly in section by Fig: 4.. The end of the shaft a is provided with
a hollow gudgeon n which is formed with a screwed collar which screws into the
threaded end of the said shaft. The said gudgeon. is bored to serve as a bearing
for the reduced end of the screw shaft b¹. In the apparatus as ordinarily
constructed the part 61 bears only in a ring which is screwed into the end of the
shaft a as in the case of the collar on the gudgeon and this bearing being short
wears away rapidly. The outside of the gudgeon is turned to suit the grinder.

page_text: brackets or bearings upon the carding engine and as both the reduced ends of the
shaft a are fixed to the shaft there is greater steadiness of motion and less friction.
Having now fully set forth and indicated the nature of our said invention and
the manner in which we carry the same into practical effect we would have it to
be understood that we claim -
First. Mounting two grinding pullies to slide upon one hollow shaft and connecting
them together so that when one pulley is slid along the shaft by the action of the
screw the other pulley will move in unison substantially as and for the purpose set
forth and indicated hereinbefore and in and by the accompanying drawings.
"
Secondly. In so termed Horsfall grinders" fitting more than one grinding
pulley to slide upon the shaft and actuating such pullies by means of separate and
distinct sets of screw grooves or connecting the pullies together so that one set of
screw grooves gives motion to both or all substantially as set forth and indicated.
Thirdly. Mounting two grinders upon one shaft and so actuating such grinders
as that when either grinder is at one end of the shaft the other will be at about
the middle of the shaft substantially as and for the purpose set forth and
indicated.
Fourthly. The arrangements whereby the fork can be removed from the
apparatus and be replaced therein without removing the screw or either of the
shaft ends or end bearings substantially as set forth and indicated.
Fifthly. Fitting the grinding pullies or one of the grinding pullies or each
grinding pulley upon a block which is prepared to slide upon the hollow shaft and
mounting the fork to swivel in a plug piece or part which can be readily removed
from its seating in the block substantially as set forth and indicated.
And lastly. The end gudgeon furnishing a long bearing for the screw shaft end
substantially as set forth and indicated with reference to Fig: 4 of the drawings.
In witness whereof I the said Joseph Standring Dronsfield for myself and on
behalf of the said Charles Butterworth have hereunto set my hand and seal this
fourth day of April in the year of our Lord one thousand eight hundred and
eighty-four
Signed, sealed and
delivered in the
presence of
EDWARD K. DUTTON
41 John Dalton St, Manchester.
JOSEPH S. DRONSFIELD (L.S.)