Improvements in Machinery or Apparatus for Grinding Rolls.
Year: 1888

page_text: Date of Application, 13th Apr., 1888
Complete Specification Left, 9th Jan., 1889
Complete Specification Accepted, 12th Feb., 1889
Improvements in Machinery or Apparatus for Grinding Rolls.
I, FRANCIS BUTTERFIELD, of the Midland Works, Keighley, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows :-
In grinding the periphery of calender or other rolls of metal, paper, cotton or
other material, it is usual to mount them by their own journals in suitable bearings,
and to which a rotatory motion is imparted, while the grinding medium is caused to
travel from end to end of such rolls, being guided in a straight line so as to produce
a perfectly cylindrical surface thereon, but it is sometimes required that a roll should
have its periphery of a concave form from end to end, and a corresponding roll with
a convex periphery so that one roll may fit correctly to the other roll.
Now my present improvements relate to machinery or apparatus for producing
the abovenamed configurations and has for object to accomplish this with a degree
of accuracy not hitherto attainable without considerable difficulty.
This I effect by means of a suitably driven shaft in a line say parallel to the line
of travel of a saddle upon the bed of the machine. This saddle is provided with a
transverse slide upon which is mounted the grinding medium (such as a revolving
grindstone or emery or other composite wheel). The transverse slide is furnished
with a screw for adjusting the grinder to the work.
"
Upon the beforementioned driven shaft I mount a worm driven by and capable of
moving along the said shaft with the travelling saddle; this worm (or if preferred
the shaft may form a continuous screw) imparts motion to a worn-wheel which
also moves with the saddle and rotates upon a suitable axis in connection with the
saddle.
On one side of the said worm-wheel I mount an eccentric, crank-stud or a cam,
the throw of which is adjustable, and provided with a suitable strap, link or other
mechanism that is in connection with a suitable lever which thus receives a recipro-
cating angular movement; At one part of this lever is a toothed seginent that
takes into and communicates motion to another segment or a wheel and upon whose
axis is another wheel that gears into and imparts motion to a wheel on the adjusting
screw of the abovenamed transverse slide. The said eccentric or crank stud is

page_text: caused to make one revolution whilst the grinder travels the full length of a roller
under treatment so that the grinder commencing at one end of the roll has completed
its inward movement when it has travelled half the length of such roll, and by the
time it has reached the other end has returned to the same or backward position
relatively with respect to the axis of the roll, that it occupied at the commencement
of the grinding operation. It will thus be obvious that a concave surface has been
ground upon the said roll.
In order to produce a convex surfaced roll to correspond with the roll just
described, the to and fro 'movement of the transverse slide requires to be reversed,
that is to say the eccentric or crank stud, when the grinder is at one end of the
roll, must commence motion with its axis directly opposite to that which it occupied
on commencing to grind a concave roll, and on completion, the convex configuration
required will thus be formed-The wheel on the transverse screw of the grinder
slide is capable of being connected or disconnected at pleasure.
Dated this 13th day of April 1888.

page_text: I, FRANCIS BUTTERFIELD, of the Midland Works, Keighley, Engineer, 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:
In grinding the periphery of calender or other rolls of metal, paper, cotton or
other material, it is usual to mount them by their own journals, in suitable bearings
upon the grinding machine, and to which a rotatory motion is imparted, while the
grinding medium is caused to travel from end to end of a roll under treatinent,
being guided in a straight line so as to produce a perfectly cylindrical surface upon
such roll, (or the grinding medium may be stationary and the roll under treatment
travel as well as rotate).-It is sometimes required that a roll should have its
periphery of a concave form from end to end, and a corresponding roll to
have a convex periphery from end to end, so that one roll may fit correctly to the
other roll.
Now my present invention relates to improvements in machinery or apparatus for
producing the abovenamed configurations and has for object to accomplish this with
a degree of accuracy not hitherto attainable without considerable difficulty.
This I effect by means of a suitably driven shaft in a line, say, parallel to the line
of travel of a saddle upon the bed of the machine. This saddle is provided with a
transverse slide upon which is mounted the grinding medium, such as a revolving
grindstone or emery or other composite wheel. The transverse slide is furnished
with a screw for adjusting the grinder to its work.
Upon the beforementioned driven shaft I mount a worm which is driven by and
capable of moving along the said shaft, by reason of its connection with the travelling
saddle above referred to, the said worn, (or if preferred the shaft upon which the
worm travels, may form a continuous screw) imparts motion to a worin wheel which
also moves with the travelling saddle and rotates upon a suitable axis in connection
therewith.
To the said worm wheel is attached an eccentric, crank-stud or a cam, the throw of
which is adjustable and provided with a suitable strap, link or other mechanism that
is in connection with a suitable lever which by the rotation of the said eccentric,
crank stud or cam receives a reciprocating angular movement.
At one part of the said lever is a toothed sector that takes into and communicates
motion to another sector or a wheel, and upon whose axis is another wheel that gears
into and imparts motion to a wheel on the adjusting and traversing screw of the
above named transverse slide.
The said eccentric, crank stud or cam is caused to make one revolution whilst the
grinder travels the full length of a roll under treatment, so that the grinding wheel,

page_text: commencing at one end of the roll has completed its inward movement (when
grinding a concave roll) by the time it has travelled half the length of such roll and
by the time it has reached the other end, has returned to the same or backward
position relatively with respect to the axis of the roll, that it occupied at the com-
mencement of the grinding operation. It will thus be obvious that a concave surface
has thus been ground upon the said roll.
In order to produce a convex surfaced roll to correspond with the roll just described,
the to and fro movement of the transverse slide previously referred to, requires to be
reversed, that is to say; the eccentric, crank stud or cam, when the grinder is at one
end of the roll, must commence motion across the face of the roll with its axis
directly opposite to that which it occupied on commencing to grind a concave roll,
and on completion the convex configuration required will thus be formed.
The wheel on the transverse screw of the grinder slide is capable of being connected
to or disconnected from the said screw at pleasure.
In the accompanying drawings similar letters refer to similar parts throughout
all the views.
Fig. 1, is a plan, (in part) of the improved apparatus according to my invention for
causing the slide upon which the grinding wheel is mounted, to be automatically
moved to and from a roll under treatment during the passage of such grinding wheel
across the face of the said roll so as to produce either a concave or a convex surface
thereon as may be required.
Fig. 2, is a front elevation in part, and
Fig. 3. is a partial end view of the same.
:
A. Figs. 1, 2, and 3, shew a portion of the bed of a roll grinding machine, B, a
sliding saddle in part,-C, a transverse slide upon which the grinding wheel"D, is
mounted, E, the screw for automatically moving the said slide and grinding wheel to
and from a roll under treatment when the wheel F, is locked thereon by means of
the nut. F 1, and by hand when the said wheel F, is released therefrom, G represents
a roll under treatment, H, is a shaft having a continuously rotating motion received
from any convenient part of the machine, this shaft drives the worm shaft I, upon
which is the worm J. that rotates therewith by means of a feather therein, and is
caused to travel with the saddle B, during the operation of grinding by means of a
bracket in connection with the saddle B, in which it has a bearing and in which it is
retained by the collar J 1, or in an equivalent manner. The said worm J; imparts
'through the worm wheel K, a rotatory motion to the eccentric L, (which may be a
crank pin or cam as before mentioned), upon which is a strap M, that forms a link in
connection with a bell-crank lever N, on the axis O, this link causes the bellcrank to
rock on the latter once to and fro in the same time that the saddle B, with the
grinding wheel travels over the length of the roll being ground.
The arm N 1, of the bellcrank N; is formed into a toothed sector that takes into
and imparts a to and fro motion in a rotatory sense to a pinion P, on the axis Q.—
In connection with the pinion P, and upon its axis Q, and upon the regulating and
traversing screw E, of the transverse, slide C, change wheels such as R, and F, are
placed to produce the concavity or convexity of the peripheries of the respective rolls
'under treatment. S, is the bracket previously referred to and connected to the
'saddle B, and carries several of the abovenamed parts.
In grinding concave and convex rolls the centre of the excentric L, requires to be
in diametrically opposite positions in relation to such rolls respectively.-When it is
required to grind parallel rolls, the wheel F, is released from the screw E, so that
there is no automatic advancement or retirement of the grinder to and from the roll
during the grinding thereof.
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
In a inachine for grinding calender and other rolls having a convex or concave
'surface in the direction of their length, mechanism or apparatus for automatically

page_text: effecting such grinding, comprising the shaft I, worm J, worm wheel K, the
adjustable eccentric L, eccentric strap or link M, bellcrank N, toothed sector N 1...
axis O, pinion P, on the axis Q, change wheel R, in connection with the pinion P,
adjusting and traversing screw E, wheel F, thereon and means for releasing it
therefrom when the machine is required to grind parallel rolls substantially as herein-
above described and shewn in the drawings annexed for the purposes specified.
Dated this Fourth day of lane 1000
Witness-
THOS. E. CRAVEN, Fel. Inst. Patent Agents,
24, Victoria Chambers, Leeds.
FRANCIS BUTTERFIELD.