Year: 1886

page_text: Date of Application, 2nd Dec., 1886.
Complete Left, 1st Sept., 1887
Complete Accepted, 4th Oct., 1887.
I WILLIAM HOULDSWORTH Manager for Messieurs Horsfall and Bickham of
Bridgewater Works Pendleton in the County of Lancaster Wire Card Manufacturers
do hereby declare the nature of this invention to be as follows:-
This invention relates principally to the well known apparatus employed for
grinding wire cards called the "Horsfall grinder" but part of such invention is also
applicable to other forms of card grinding apparatus.
*
The Horsfall grinder" consists of a grinding wheel or roller covered with emery
which is mounted upon a slotted tube so as to be able to slide thereon. Inside this
slotted tube is a shaft which is cut in the form of a double threaded screw (right and
left hand). A fork or key connected to the interior of the grinding wheel or roller
passes through the slot in the tube and the two ends of the fork work in the screw
thread cut in the shaft inside the tube. The shaft and the slotted tube are driven at
different speeds by means of two pulleys.
The slotted tube and the grinding roller being connected by the fork or key above
named revolve together at the same speed, but as the internal screwed rod revolves
at a different speed the action of the double threaded screw upon the fork or key
above named causes it at the same time to travel from end to end of the slot and back
again, and as it is connected to the grinding roller, it causes the latter to move from
end to end of the slotted tube and back again at the same time that it moves with
it, the speed of the endwise movement of the grinding roller being in proportion to
the difference between the two velocities.
The object of the first part of my present improvements is to obtain this differential
movement of the shaft and tube from one driving pulley only so as to simplify the
driving, and at the same time to afford facility for readily changing the relative
speeds so as to increase or decrease the rate at which the grinding roller is
traversed.
I employ the slotted tube and the internal double screwed shaft with the grinding
roller and its fork or key as before.
I however only fix one driving pulley upon the hollow axis at one end of the
slotted tube.

page_text: At the hollow axis at the other end of this tube I fix a spur-wheel and close to
this, on the end of the screwed shaft passes through this hollow axis I fix a similar
wheel of a different diameter either larger or smaller as the case may be. In gear
with each of these wheels is a second spur wheel, the two latter wheels being either
cast together or both fixed on the same spindle.
The spindle is carried in a frame which also embraces the hollow axis and screwed
shaft so as to keep all the wheels in gear.
As the slotted tube revolves (being driven by a strap or band passing round its
driving pulley) the spur wheel keyed at its other end drives one of the twin wheels
above named and the other drives the spur wheel keyed on the end of the screwed
shaft at a reduced or increased speed according to the difference in the diameters of
the spur wheels so that the slotted tube and the screwed shaft revolving at different
speeds the grinding wheel or roller will be traversed as before.
The second part of my invention relates to the construction of the grinding wheel
or roller itself the object being to grind the surface of the card cylinder to a true
circle and to sharpen or point the wire teeth at one and the same time. For this
purpose it is usual to have two separate sets of grinding apparatus, one with a
plain cylindrical grinder and the other with a V-grooved grinder and to use the two
separately.
My invention consists in making the grinding roller with alternate circumferential
rings or zones, one of plain cylindrical form and the other V-grooved rings or spirals
and the action of this grinder as it is caused to revolve rapidly and to traverse to and
fro on the face of the card cylinder is that the plain cylindrical rings or zones grind
the cards to a true cylinder whilst at the same time the V-grooved rings or zones
sharpen the points of the same.
This part of my invention is also applicable to other forms of card grinding
apparatus.
Dated this 1st day of December 1886.
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicant.

page_text: Improvements in Apparatus for Grinding Cards.
I WILLIAM HOULDSWORTH Manager for Messieurs Horsfall and Bickham of
Bridgewater Works Pendleton in the County of Lancaster, Wire Card Manufacturers,
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:
This invention relates principally to the well known apparatus employed for
grinding wire cards called the "Horsfall Grinder" but part of such invention is also
applicable to other forms of card grinding apparatus.
The Horsfall Grinder" consists of a grinding wheel or roller covered with emery
which is mounted upon a slotted tube so as to be able to slide thereon.
Inside this slotted tube is a shaft which is cut in the form of a double threaded
screw (right and left hand). A fork or key connected to the interior of the grinding
wheel or roller passes through the slot in the tube and the fork works in the screw
thread cut in the shaft inside the tube. The shaft and the slotted tube are driven at
different speeds by means of two pulleys.
The slotted tube and the grinding roller being connected by the fork or key above
named revolve together at the same speed, but as the internal screwed rod revolves
at a different speed the action of the double threaded screw upon the fork or key
above named causes it at the same time to travel from end to end of the slot and back
again and as it is connected to the grinding roller it causes the latter to move from
end to end of the slotted tube and back again at the same time that it revolves with
it, the speed of the endwise movement of the grinding roller being in proportion to
the difference between the two velocities.
The objects of the first part of my present improvements are to obtain this
differential movement of the shaft and tube from one driving pulley only so as to
simplify the driving, and at the same time to ensure greater accuracy and certainty
in the differential movement and to obtain a slower traverse.
The nature of my said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference to
the annexed sheet of drawings and the following explanation thereof.
Fig. 1 is a partial sectional elevation of so much of a
Horsfall" grinder as is
necessary to illustrate my invention. Fig. 2 is a transverse section and Fig. 3 a
longitudinal section of my improved portion of the same drawn to a larger scale.
Fig. 4 is a section through about the line A-B in Fig. 1.
I employ the slotted tube a. a. and the internal double screwed shaft b. b. with the
grinding roller c. c. and its fork or key d. d. Fig. 4 as before.
I however only fix one driving pulley (not seen on the drawing) upon the axis at
one end of the slotted tube a. a.
On the hollow axis at the other end of this tube I fix a spur wheel e. e. and close
to this, on the end of the screwed shaft b. b. which passes through this hollow axis I

page_text: fix a similar wheel f. f. of a different diameter either larger or smaller as the case
may be (or their diameters may be the same and the pitch of the teeth slightly
different). In gear with each of these wheels e. e. and ff. are two carrier spur
wheels g. g. and h. h. the two latter wheels being either cast together or both fixed on
the same spindle or on the same bush i. i.
This spindle is carried in a frame or box k. k. which also embraces the hollow
axis a. a. and screwed shaft b. b. so as to keep all the wheels in gear.
As the slotted tube a. a. revolves (being driven by a strap or band passing round
its driving pulley) the spur wheel e. e. keyed at its other end drives one of the twin
or carrier wheels g. g. above named and the other h. h. drives the spur wheel ff.
keyed on the end of the screwed shaft b. b. at a reduced or increased speed according
to the difference in the diameters or the pitch of the teeth of the spur wheels so that
the slotted tube a. a. and the screwed shaft b. b. revolving at different speeds the
grinding wheel or roller c. c. will be traversed as before.
If preferred the wheels on the slotted tube and screwed shaft may be of the same
diameter and have an equal number of teeth, and the two carrier wheels may be of
slightly different pitch so that one of them has one or two teeth more than the other
in the same circumference. This is the arrangement which I find preferable when a
very slow traverse of the grinding roller is required.
The second part of my invention relates to the construction of the grinding wheel
or roller itself, the object being to grind the surface of the card cylinder to a true
cylindrical form and to sharpen or point the wire teeth at one and the same time.
For this purpose it is usual to have two separate sets of grinding apparatus one with
a plain cylindrical grinder and the other with a V-grooved grinder and to use the two
separately.
My invention consists in making the grinding roller c. c. with alternate circum-
ferential rings or zones as shown at Fig. 1. one of plain cylindrical form and the
other of V-grooved rings or spirals and the action of this grinder as it is caused
to revolve rapidly and to traverse to and fro on the face of the card cylinder is
that the plain cylindrical rings or zones grind the cards to a true cylinder whilst at
the same time the V-grooved rings or zones sharpen the points of the wire.
I prefer to make these grinders from a consolidated emery cylinder turned to the
form shown at Fig. 1 or 1 may use an enery cylinder moulded or pressed to the
required form.
This part of my invention is also applicable to other forms of card grinding
apparatus.
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 :-
In the traversing motion of a "Horsfall grinder the employment of spur gearing
substantially as hereinbefore described and illustrated by the annexed drawing to
obtain the differential motion between the slotted tube and the screwed shaft necessary
for traversing the grinding wheel or roller, and
Secondly, I claim, the improved emery grinding wheel or roller having alternate
circumferential rings or zones, one of plain cylindrical form and the other of
V-grooved rings or spirals substantially in the manner and for the purpose
hereinbefore set forth and illustrated by the drawings annexed.
Dated this 31st day of August 1887
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicant.