Improvements in Apparatus for Grinding Wire Cards.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Grinding Wire Cards.
We JOSEPH ROTHWELL, Card Fitter, of 26 James Street off Wilson Street,
and FRED ROTHWELL Foreman, of 103 Rochdale Road, both of Bury, in the
County of Lancaster do hereby declare the nature of this invention to be as
follows:-
This invention relates to that class of apparatus for grinding the card covered
cylinders doffers and rollers of carding engines in which a comparatively narrow
grinding wheel or roller is caused to traverse across the length or width of the
card covered cylinder, doffer, or roller, as it grinds the teeth of the latter, this class
of apparatus being commonly known as the "Horsfall" type.
It is found that the above named grinding roller or wheel has a tendency to
grind the cylinders doffers and rollers somewhat untruly, owing to the revolving
grinding wheel or roller slightly deflecting its shaft when at the central part thereof
and thus grinding the card teeth rather more deeply at the centre than at the
edges or ends of the cylinder, doffer and rollers.
We propose to remedy this defect by imparting to the grinding wheel or roller a
differential traverse motion, slow at the ends or sides and gradually quicker as it
approaches the centre, and by thus altering the rapidity of the traverse of the
grinding wheel we compensate for the irregularity in its action.
We may sometimes so regulate the traverse as to grind the cards slightly more
at the edges than at the centre of the cylinder doffer or roller.
We may effect this differential traverse in various ways, for example, we may
vary the difference between the speeds of the shafts as the wheel is traversing
along the same by suitable differential gearing, or we may vary the rapidity of
the pitch of the screw which effects the said traverse and thus obtain the varying
speed thereof.
Dated this 2nd day of January 1896.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.
Improvements in Apparatus for Grinding Wire Cards.
We JOSEPH ROTHWELL, of 349 Broad Street, Mile End, Glasgow, in the
County of Lanark, Carder, late of 26 James Street, off Wilson Street, Bury, in
the County of Lancaster, Card Fitter, and FRED ROTHWELL, of 103 Rochdale
Road, Bury, aforesaid, Foreman, do hereby derlare the nature of this invention
and in what manner the same is to be performed to be particularly described and
ascertained in aud by the following statement :-
This invention relates to that class of apparatus for grinding the surface of
card-covered cylinders, doffers, flats, and rollers in which a narrow grinding wheel

page_text: or disc is caused to traverse across the length or width of the card-covered surface
as it grinds the teeth of the latter; this class of apparatus being commonly known
as the "Horsfall" type.
It is found that the above named grinding wheel or disc has a tendency to grind
the cylinders, doffers, flats and rollers somewhat more deeply towards the centre
than at the edges or ends of the same.
We propose to remedy this defect by imparting to the grinding wheel or disea
differential traverse motion slower at the ends or sides and gradually quicker as it
approaches the centre, and by thus altering the speed of the traverse of the
grinding wheel or disc we compensate for any irregularity in the grinding.
The manner in which we propose to carry our invention into practical effect will
be readily understood on reference to the sheet of drawings bereunto annexed and
the following explanation thereof.
We may eflect this differential traverse in various ways, for example, we may
vary the rapidity of traverse by altering the pitch of the screw which effects the
said traverse so that the pitch is slower at the ends and quicker towards the centre,
as shewn in elevation and partial section at Fig. 1 of the drawings, or we may
effect the same by means of differential gear for driving the ordinary Horafall"
screw so as to move the grinding wheel or disc slower at the beginning and end of
each traverse and quicker at the centre as illustrated in end view at Fig. 2 and
elevation at Fig. 3 on the drawings.
Referring to Fig. 1 (which is drawn partly in section) it will be seen that instead
of using the ordinary "Horsfall" screw with the crossed thread made of the same
pitch from end to end, we make a screw a with a differential pitch, that is, slower
at each end and getting gradually quicker towards the centre, which will it is
evident, give the required differential traverse to the grinding wheel or disc b out-
side the slotted tube or barrel c.
It will be understood that this arrangement is used when the grinding wheel or
disc is placed above the roller or other surface to be ground, but in cases where it
is more convenient or otherwise desirable to place the grinding wheel or disc b
below the surface to the ground, then the pitch of the screw a may be arranged in
the reverse manner that is to say, it may be quicker at each end or side and
slower towards the centre.
In the arrangement illustrated by Figs. 2 and 3 the screw a is made as usual
with the thread at a regular pitch from end to end, and the differential traverse of
the grinding wheel or dise b is effected in the following manner.
On a sleeve at the end of the barrel c we fix a worm d driving a worm wheele
(say of 44 teeth) on the boss of which is a bevil wheel driving a similar wheel g of
the same size on one end of a short shaft or axle h at the other end of which is keyed
an excentric spur wheel i driving a similar excentric spur wheel k of the same size
mounted loosely on the screw shaft a' both having say 35 teeth. To the latter
wheel is cast or fixed an ordinary spur wheel 2 of (say) 50 teeth driving a pinion m
of (say) 10 teeth cast upon the buss of a spur wheel n having also 50 teeth and
driving a spur pinion o having 10 teeth keyed upon the screw sbatt, thus giving
the barrel c sufficient lead over the screw a to cause the grinding wheel or dise b to
traverse from end to end of the barrel.
The excentric wheels i and are so proportioned as to make one revolution to
each traverse of the grinding wheel or disc from end to end of the barrel and their
position with regard to each other aud their amount of excentricity are so arranged
as to give the required differential motion to the speed of the screw shaft.
In this case it will be understood that the barrel c is the first driver.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :
The improvements in card grinding apparatus of the "Horsfall" type consisting

page_text: in giving a differential traversing motion (instead of a regular traversing motion)
to the grinding wheel or disc, first by giving a differential pitch to the thread of
the traversing screw, or secondly by giving a differential speed to the ordinary
traversing screw, substantially in the manner and for the purposes bereinbefore set
forth and illustrated by the drawings annexed.
Dated this 30th day of September 1896.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.