IMPROVEMENTS IN MACHINERY FOR GRINDING ROLLERS OR CYLINDERS
Year: 1884

page_text: I JOSEPH STANDRING DRONSFIELD of the Atlas Works, Park Street Oldham
in the County of Lancaster, Machine Maker, do hereby declare the nature of
the said invention for "IMPROVEMENTS IN MACHINERY FOR GRINDING ROLLERS
OR CYLINDERS" to be as follows:-
The apparatus constituting the subject matter of my invention has been
designed more particularly for use in the grinding of the rollers used in surface
printing, but the said apparatus is well suited for employment in the grinding of
rollers or cylinders intended for other uses. In the cases of the said surface
printing rollers it is important not only that the rollers should be ground to a true
cylindrical form, so far as the raised printing surfaces are concerned but that all
the rollers forming a set should be ground to one uniform diameter. In my
improved apparatus the roller to be ground is mounted with its journals resting in
bearings which can be moved towards and from the grinder shaft and be in all
positions uniformly parallel therewith. For the purposes of my invention I prefer
to use the motion for which Letters Patent bearing date the seventh day of April
in the year 1880 and numbered 1415 were granted to me.
In the said motion the
roller is advanced and retracted by acting upon a hand wheel upon a worm shaft.
Upon this worm shaft I mount a finger which can be fixed to the shaft in any
required position around its axis. When one roller in a set has been ground down
to the required diameter I adjust the said finger to bear against a stop. The
succeeding rollers are then ground until the said fingers bear against the stop
which is preferably fitted to slide or to turn out of the way to provide for cases
wherein more than one revolution is required or such a movement as would
necessitate the withdrawal of the stop. The grinder is mounted to slide upon a
strong shaft and is slid to and fro thereon by means of a screw shaft which
actuates a carrier which moves the grinder. The said screw shaft is either cut
with right and left hand threads or is fitted with a reversing motion or arrange-
ments are made for reversing the direction of movement at each end of the traverse
of the grinder. In cases wherein the direction of revolution of the screw shaft is
reversed I may also reverse the grinder or in any case I may so reverse the grinder,
37

page_text: or the the roller being ground in order to lessen the tendency to the formation of
ragged edges. The grinder may be a solid or consolidated emery wheel or an
emery covered wheel or cylinder or a wheel or cylinder covered with an emery
coated material or a grinder of a suitable nature. I prefer to make the grinder
shaft of cast iron of a tubular formation and to balance it correctly by cutting the
key groove on the heaviest side.
Improvements in Machinery for Grinding Rollers or Cylinders.
I JOSEPH STANDRING DRONSFIELD of the Atlas Works, Park Street Oldham
in the County of Lancaster Machine Maker do hereby declare the nature of
the said Invention for IMPROVEMENTS IN MACHINERY FOR GRINDING ROLLERS
OR CYLINDERS" 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:-
:-
The apparatus constituting the subject matter of my invention has been designed
more particularly for use in the grinding of the Rollers used in Surface Printing
but the said apparatus is well suited for employment in the grinding of rollers or
cylinders intended for other uses. In the cases of the said surface printing rollers
it is important not only that the rollers should be ground to a true cylindrical formn
so far as the raised printing surfaces are concerned but that all the rollers forming
a set should be ground to one uniform diameter. In my improved apparatus the
roller to be ground is mounted with its journals resting in bearings which can be
moved toward and from the grinder shaft and be in all positions uniformly parallel
therewith. For the purposes of my Invention I prefer to use the motion for which
Letters Patent bearing date the seventh day of April in the year 1880 and
numbered 1415 were granted to me. In the said motion the roller is advanced
and retracted by acting upon a hand wheel upon a worm shaft. Upon this worin
shaft I mount a finger which can be fixed to the shaft in any required position
around its axis. When one roller in a set has been ground down to the
required diameter I adjust the said finger to bear against a stop. The grinder is
mounted to slide upon a strong shaft and is slid to and fro thereon by means of a
screw shaft.

page_text: In order that my Invention may be fully understood I will describe the same
with reference to the accompanying drawings wherein Fig. 1 represents a Vertical
Cross Section of a machine constructed in accordance with my invention and Fig. 2
a Front Elevation of so much of the machine as is necessary to enable its con-
struction and action to be understood the said Figs. being made to a scale of about
1 inches to the foot. In the said Figs. or in one of them a represents the roller
to he ground; b. is the grinder and c. is the screw shaft. The journals of the
roller a. or the ends of the mandril which carries such roller rest in seatings in
the upper ends of two levers which are mounted to vibrate so as to move the
said roller nearer to or further from the grinder as in the machines now well
known as "Dronsfields Card Roller Grinders" and as described in the Specification
of my aforesaid former Invention. One of these levers appears at d in Fig. 1 and
is mounted to turn upon a bracket c. which is fixed to the framing of the machine.
The lower ends of the lever aro acted upon by a shaft f. upon which is a worm
quadrant g. which is actuated by a worm h. upon the shaft i When the shaft is
turned by means of the hand wheel j. the upper ends of the two levers d. are
caused to move simultaneously and to an equal extent so as to carry the roller a.
nearer to or further from the grinder and as the two ends of the roller are moved
to the same extent the parallelism of the roller is maintained. The grinder b. is
mounted to slide upon a strong shaft k. which is by preference tubular and made of
cast iron. In this shaft is placed or cut a key groove the shaft being balanced and
the key groove cut in the heaviest side. A key fitted in the boss L. upon which
the grinder is mounted slides in the said key groove. The grinder is slid upon the
shaft by means of a forked carrier m which embraces the screw shaft c. which is
cut with right and left hand threads as in the case of the screw used in the Horsfall
card grinder. A shunting key is fitted in the carrier so that as the screw revolves the
carrier is traversed to and fro from end to end of the screwed portion of the shaft.
The screw shaft is driven by means of a pulley o. upon the driving shaft p.
A pulley upon the other end of this driving shaft gives motion to the grinder
shaft k. and a third pulley upon the driving shaft imparts a revolving motion to
the roller which is being ground. Instead of the screw shaft being cut with right
and left hand threads it may be fitted with a reversing motion or arrangements
may be made for reversing the direction of movement at each end of the traversc
of the grinder. In cases wherein the direction of revolution of the screw shaft
is reversed I may also reverse the grinder or in any case I may so reverse the
grinder or the roller being ground in order to lessen the tendency to the formation
of ragged edges. The grinder may be a solid or consolidated emery wheel or aa
emery covered wheel or cylinder or a wheel or cylinder covered with an emery
coated material or a grinder of a suitable nature. As the screw shaft revolves the
grinder is traversed to and fro upon its axis and the roller to be ground is
moved toward the grinder and becomes ground from end to end and reduced to
a true cylindrical surface formation. When reduced to the required general surface
diameter the regulating stop is brought into requisition. This stop appears at r.
in Figs. 1 and 2 and is separately illustrated by Fig. 3. A finger 7. is mounted
upon the end of the worm shaft i. and can be turned around upon the shaft and
be fixed in any position by means of a set-screw or by suitable means. When the
required diameter is obtained as aforesaid the said finger is brought into contact
with the end of a rod a. which is fitted to slide in a fixed bracket t. The finger
is then fixed to the worm shaft and the latter can be turned back to withdraw the
roller. The succeeding rollers are then ground until the finger again bears against
the rod s. which will indicate that the desired diameter is attained. Whenever
desirable and particularly when more than one revolution of the worm shaft is
required the rod s. is released and slid back in the bracket so as to permit the
finger to pass. Fig. 4 illustrates one of the modifications which can be made in
the stop arrangement. In this example the abutment for the finger is in the form
of a second finger te. which when turned up as indicated by the dotted lines will

page_text: permit the finger r. to pass. The machine can be modified to carry two rollers
one on each side so that both can be ground at once thereby balancing the
pressure upon the grinder shaft or if considered to be desirable more than two
rollers may be ground at one operation.
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
1. The apparatus constructed and acting substantially as and for the purpose set
forth and indicated hereinbefore and in and by the accompanying drawings.
2. In a machine for grinding rollers the screw shaft acting upon the carrier
to slide the roller to and fro upon a revolving shaft in combination with parts
for carrying the roller to be ground and for moving it toward and from the
grinder substantially as set forth and indicated.
3. The adjustable stop r. substantially as and for the purpose set forth and
indicated.