Improvements in Traversing Motions for Card Grinding Rollers.
Year: 1892

page_text: Date of Application, 28th May, 1892
Complete Specification Left, 25th Feb., 1893-Accepted, 1st Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in Traversing Motions for Card Grinding Rollers.
I JAMES DRONSFIELD of the firmn of Dronsfield Brothers Limited, of the Atlas
Works, Oldham, in the County of Lancaster, Card Grinding Machine Makers.
do hereby declare the nature of this invention to be as follows:-
My invention relates to the card grinding apparatus now well known under the
designation of Horsfall grinding rollers. In such apparatus the grinder is mounted
to slide upon a hollow shaft and is traversed to and fro by means of a right and
left hand threaded screw which is mounted inside the shaft and is revolved faster
or slower than the said shaft as is well understood.
screw.
My invention relates to means for obtaining the differential motion of the said
I connect the outer shaft with the inner screw shaft by means of internal
and external toothed wheels the difference in the numbers of teeth of the two wheels
determining the difference in speed of the two shafts. As the external spur wheel
has to move excentrically around the axis of the two shafts it is necessary to carry
the said wheel upon an excentric and to connect the wheel with the driving shaft
by means of a driver which will have a sliding connection with the wheel the
excentric being prevented from revolving. I have found that with the use of one
excentric the traversing movement of the grinder was not regular but this difficulty
I have overcome by the use of two excentrics one having half the throw of the
other. The second excentric carries a ring which transfers the motion from the
driver to the wheel and has a sliding connection with the driver.
By means of this combination the variation in the driving of the spur wheel is
counterbalanced by a contrary variation in the driving of the ring on the second
excentric. To prevent the excentrics from revolving I form them upon or fix them
to a part which is formed with a projection which extends into the bearing of the
"grinder bracket." The teeth of the internal wheel are formed upon a cylindrical
shell which with the part carrying the excentrics compose a neat casing for the
parts of the apparatus.
The arrangement and action of the parts may be varied to some extent as for
example the internal wheel might be held from revolving and the excentric carrying
the other wheel be revolved.
Deted thi 07th 1 - 1000
E. K. DUTTON & Co.,
5, John Dalton Street, Manchester, Agents.
COMPLETE SPECIFICATION.
Improvements in Traversing Motions for Card Grinding Rollers.
I JAMES DRONSFIELD of the firm of Dronsfield Brothers Limited, of the
Atlas Works, Oldham, in the County of Lancaster, Card Grinding Machine
Makers, 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 and accompanying drawings :-
My invention relates to emery wheel grinding rollers, used in the grinding of
cards of textile machinery.
In such apparatus of the class to which my invention relates the grinder is
mounted to slide upon a hollow shaft and is traversed to and fro by means of a
right and left hand threaded screw which is mounted inside the shaft and is revolved
faster or slower than the said shaft as is, well understood.

page_text: My invention relates to means for obtaining the differential motion of the said
screw.
I connect the outer shaft with the inner-screw shaft by means of internal and
external toothed wheels the difference in the numbers of teeth of the two wheels
determining the difference in speed of the two shafts. As the external spur wheel
has to be mounted excentrically with relation to the axis of the two shafts it is
necessary to carry the said wheel upon-an excentric and to connect the wheel with
the driving shaft by means of a driver which will have a sliding connection with
the wheel the excentric being prevented from revolving. I have found that
with the use of one excentric the traversing movement of the grinder was not
regular but this difficulty I have overcome by the use of two excentrics one having
half the throw of the other. The second excentric carries a ring which transmits
the motion from the driver to the wheel and has a sliding connection with the
driver.
By means of this combination the variation in the driving of the spur wheel is
counterbalanced by a contrary variation in the driving of the ring on the second
excentric.
My invention will be most fully understood when described with reference to
the accompanying two sheets of drawings.
Of the drawings Fig. 1. represents a diametric section of my improved
differential motion and Fig. 2. represents a section on the line A. B. in Fig. 1.
The remaining figs. are illustrative of the details and action of the apparatus and
will be hereinafter referred to.
In Figs. 1 and 2 the end of one of the hollow journals or reduced parts which
project from each end of the hollow shaft upon which slides the grinding boss or
cylinder of the ordinary "Horsfall" grinder is represented by 1, the end of the
screw shaft being represented by 2. As the construction of the Horsfall grinder
is now well known it has not been considered necessary to further illustrate the
same in the drawings hereto.
In the ordinary grinding apparatus when in use the hollow shaft 1 revolves in a
bearing or "bracket" attached to the framing of the carding engine or other
machine to which the grinder is applied and 2 revolves in a hearing formned in the
said hollow shaft. Shaft 1 is the first motion shaft which imparts rotary motion at
a reduced rate to the second motion shaft 2.
Upon shaft 2 a shell a is secured by means of a set screw a¹ and is formed
with a ring of internal spur teeth a, which I will term an internal wheel.
Upon shaft 1 is mounted an excentric carrier b which is separately represented.
by Figs. 3 and 4. Upon this carrier are formed two excentrics and 2. Upon
the excentric 6' an externally toothed wheel e is mounted to revolve and gears
with the wheel a². This wheel c which I will term an external wheel is
separately represented by Figs. 5 and 6 wherein appears a radial groove c¹ cut
in one side of the wheel. The distance from the common axis of the shafts 1
and 2 to the axis of the excentric 6' is equal to the difference between the
lengths of the radii of the wheels a² and c. The excentric carrier is prevented
from revolving
so that if the wheel c be revolved the shell a and as a consequence
the shaft 2 will revolve at a slower speed proportionate to the difference between
the numbers of teeth in the wheels. To prevent the revolution of the carrier & it is
provided with a projecting pin 63 which may enter a hole or recess in a fixed part. In
practice I mount upon this pin a piece which fits between the cheeks of the bearing
in the grinder bracket and thus keeps the carrier from revolving. The wheel cis
revolved by means of a driver d which is fixed upon the end of the shaft 1 and is
separately represented by Figs. 7 and 8. For convenience of fixing upon the shaft
this driver is split at d¹ and is provided with a tightening screw d². By tightening
this screw the driver is firmly secured to the shaft. The driver is formed with a
radial groove at as in the case of the groove c' in the wheel c. Motion is
transmitted from the driver to the wheel c through a transmitter e which is
separately represented by Figs. 9 and 10.

page_text: This transmitter is provided on each side with a projecting swivel stud e¹ e² each
stud having a. square or oblong head to fit one or the other of the grooves d³
and with a round shank which fits loosely in a hole drilled in the transmitter.
The two studs are situated on a line passing through the centre of the transmitter
and on opposite sides of such centre as clearly shown in the drawing. Fixed
studs or bowls mounted to revolve upon fixed studs might be used in place of the
swivel studs. The transmitter is mounted upon the second excentric 62 one stud
engaging with the groove e¹ and the other stud with the groove ³ as seen in
Fig. 1. The shanks of the studs being free to turn in their bearings the square
heads can accommodate themselves to the movements of the parts.
f:
When the shaft 1 is rotated the driver d rotates the transmitter and the latter
rotates the wheel which gives motion to the shell a and thereby to the shaft 2.
As the transmitter revolves the stud e' slides in the groove c' nearer to and
further from the axis of the wheel c and without some compensation would impart
an irregular motion to the said wheel. The transmitter acts as a compensator to
neutralise such irregularity in the motion.. The bearing 62 upon which the trans-
mitter is mounted has half the excentricity of the bearing & and as the axis of the
bearing 2 is on the radial line from the axis of the shafts 1 and 2 to the axis of the
bearing b¹ and as the swivel studs are on opposite sides of the axial line of the trans-
mitter it follows that when one stud is nearing the centre of the wheel c the other
stud will be moving away from such centre. The effect of this is that when the
transmitter would be tending to drive the wheel c more quickly the driver d would
tend to revolve the transmitter more slowly the two variations balancing each other
so that the wheel c revolves at a regular speed.
This is proved by the diagram Fig. 11 in which c represents the pitch line of
the wheel c revolving on the centre, e is the path of the swivel studs around the
centre 2 and d is a circle around the centre 1 which represents the axis of the
shaft 1 and driver d.
The driver d in making a sixth of a revolution would move one of its studs
from 2 to 3, the other stud moving from 4 to 5 whereby a point on the circle c
would be turned a sixth of a revolution from 6 to 7.
In the example the wheel c has 36 teeth and the wheel a² 40 teeth the result of
the use of this proportion being that the screw shaft will make only 90 revolutions
whilst the outer hollow shaft carrying the grinding boss would make 100 revolutions.
It will be obvious that the proportions of the two wheels may be varied. The
parts a and b as formed constitute a casing to protect the gearing and other parts
of the motion but the forms of the parts may be varied. If preferred the con-
struction might be varied by preventing the wheel a² from revolving and by
revolving the excentrics. In such a case the teeth a' might be formed upon the
part 6 which might be formed with the hollow cylindrical part of the case a but
would not be formed with the excentrics which would be secured to the shaft 1 and
revolve with it.
The transmitter e would give motion to a part fixed upon the shaft 2 and this
part might be in the form of a disc closing the end of the case the driver d
not being required as a separate part but might be formed upon or attached to the
excentrics.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
1) The combination of parts constructed and adapted to act substantially as and
for the purpose set forth and indicated.
2) A differential motion for card grinders having travelling bosses consisting of
an internal toothed wheel an external toothed wheel mounted on a fixed axis
excentric to the axis of the internal toothed wheel a driver revolving on the same
axial line as the internal toothed wheel and a transmitter revolving on an axis
which is on the radial line from the axis of the internal toothed wheel to the axis

page_text: of the external toothed wheel and half way between the two axes the transmitter
receiving revolving motion from the driver and transmitting motion to the external
wheel substantially as set forth.
3) A differential motion for the stated use consisting of an external and an
internal toothed wheel gearing together two excentrics one carrying the external
wheel and the other of half the excentricity of the first named carrying a transmitter
which connects the external wheel with a part which is fixed upon the outer or the
inner shaft of the grinder the excentrics or the internal wheel being prevented from
revolving the parts being constructed and arranged to have the action substantially
as set forth.
Dated this 24th day of February 1893.
E. K. DUTTON & Co.,
5, John Dalton Street, Manchester, Agents.