A MACHINE FOR GROOVING THE SURFACES OF METAL AND OTHER ROLLS
Year: 1885

page_text: COMPLETE SPECIFICATION.
I, GEORGE FREDERICK THOMPSON of 24 Seller St in the City of Chester
Mechanical Engineer do hereby declare the nature of my invention for A MACHINE
FOR GROOVING THE SURFACES OF METAL AND OTHER ROLLS and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :—
My Invention relates to the construction of a machine for grooving, either
spirally or straight, i.e. parallel with their axes, the surfaces of chilled iron, steel or
other rolls, in which the roll is operated upon by two or more travelling tools,
cutting in one direction and returning at a speed fifteen to twenty times faster
than the cutting speed, the roll being oscillated during the operation of cutting,
and during the return, allowed to slip back so as to present a fresh place for next
cut at any desired distance from last groove.
The objects are to facilitate the setting of the roll to be grooved; to render the
mechanism easily adjustable for various degrees of spiral and number of grooves
per inch; and to avoid the necessity of providing new parts for the above purpose;
also to enable the tools to be adjusted vertically as well as in other directions
after being screwed down.
The roll is carried by the bearing parts of its own spindle in suitable stays upon
the machine bed, and is connected to the headstock, which imparts the oscillating
motion, by an adjustable non-influencing driving clutch, somewhat in the form of a
compass balance, the inner or secondary ring having four key ways equidistant
around its interior, into which fit four double-wedge keys, another similar ring
with keyways, fitting upon the outer ends of the aforsaid keys is connected to
the first mentioned ring by bolts, the screwing up of which, tightens all the keys
simultaneously upon the roll spindle.
The oscillating apparatus consists of a faceplate having bevel teeth cut upon its
periphery into which gears a worm deriving its motion from the leading screw, the
number of revolutions of the worm is varied by change wheels to give either quick
or slow spiral.
The apparatus for allowing the roll to slip back during the return of the tools,
is as follows, the spindle upon which the aforsaid worm is fixed is made hollow,
and upon its outer end is secured a disc, having a series of holes in concentric
circles, alongside of this disc is placed a spur wheel having a plain radial slot,
outside this wheel is another disc having a slot similar to the spur wheel, in which

page_text: is an adjustable stud passing through the slot in the wheel and into any one of the
holes in the aforsaid disc, this outer disc is attached to a spindle passing through
the aforsaid hollow worm spindle and has a spiral spring upon it to keep the disc
close up against the aforsaid spur wheel; this internal spindle is pushed by a bell
crank actuated by a pointer carried by the saddle, and momentarily disengages the
aforsaid stud in the disc, the spur wheel carrying the stud around until the next
hole is reached when it is drawn in by the aforsaid spiral spring; by setting the
stud to any particular series of holes a certain amount of "slip" is obtained.
The tools, which are carried by two rests placed, one on each side of the roll, are
screwed down upon plates, placed vertically against movable standards upon the
saddle, said plates being attached to the standards by bolt pins, the tools can thus
be adjusted vertically, the plates are then clamped tightly against the standards by
means of the aforsaid bolt pins.
To throw off the tools simultaneously during the quick return of the saddle, and
return them to their original positions, I employ the following apparatus; instead
of running the setting-up screws into fixed nuts I make these said nuts to slide in a
secondary channel across the saddle, and continuations in the form of plates having
studs at their extreme ends, are carried to to the centre of the saddle, over these
I place another plate having two slots at a slight angle to each other, into which
fit the two studs upon the nut plates, by giving the slotted plate an endway
movement at each end of the travel of the saddle, the nuts are separated or drawn
together; the plate is actuated by stops upon the stays.
The saddle is propelled by a leading screw running the length of the machine,
a continuation of which is carried out beyond the rear end of the bed and has a
wheel and pinion both loose upon it, between these is placed a clutch sliding upon
a feather key, which engages the wheel for slow motion and the pinion for quick
return respectively; another wheel and pinion are carried by a counter shaft and
gear in with the first mentioned pinion and wheel respectively; this shaft also
carries the fast and loose pullies-An intermediate wheel is introduced between the
'slow pair to give the reverse motion-The clutch is thrown in and out of gear with
the wheel and pinion by a falling weighted lever, actuated by the saddle.
In order that my said Invention may be better understanded I hereunto append a
sheet of explanatory Drawings in which Fig 1. is an elevation, Fig 2 an end
section and Fig a plan of my said machine, the letters referring to the same
parts in each view-A is the roll attached to the faceplate B, by means of the non
influencing driver C gripping the roll spindle by means of the outer ring D, and
'wedges E. E. E. E, the faceplate B is actuated by the worm G, contained in the
base of the headstock F, and derives its motion from the end of the screw shaft H,
'connection being established by the adjustable slip motion I as previously
described; the number of revolutions of this apparatus being varied by means of
change wheels J-The saddle K carries the two standards L L and plates M M
upon which the tools T T are secured-The said standards being drawn together
or separated by the slotted plate N, as already described-P P are the adjustable
stops for operating the plate N-The clutch S. is operated by the lever U, which
is connected to the falling weighted lever V, by the rod W, said lever being thrown
over by the saddle K-X Y are the wheel and pinion for the slow motion,
Z, 1, are the pinion and wheel for the quick return-2 and 3 are the fast and loose
pullies for driving the machine.
I do not confine myself to a machine carrying one saddle, nor the said saddle
carrying only two tools, I may lengthen out the bed of my machine so as to carry
two or more rolls and place upon it two or more saddles, each operating one roll;
I may also arrange the rests on said saddles so as to carry two or more tools
each Nor do I confine myself strictly to the use of the non influencing driver in
connecting the roll to the oscillating apparatus, but may put the double-wedge
'keys directly into keyways cut inside the hollow mandrel of the oscillating
apparatus, and tighten them simultaneously upon the roll spindle by means of one
large nut passing over the ends of all four keys,

page_text: Neither do I confine myself to the use of four keys, I may use three or five in
preference.
Having fully described and ascertained the nature of my said Invention, and the
manner in which the same is to be performed, I claim as new, and desire to secure
by Letters Patent
1-A machine for grooving, either spirally or straight, i.e. parallel with their
axes, the surfaces of metal and other rolls, in which the roll is allowed to slip back,
or caused to stand still, for a portion of the time during which the tools are
returning, by an adjustable connection, consisting of a wheel with a radial slot and
a perforated plate, connected by an adjustable stud, substantially as herein shewn
and described.
2-In a machine for grooving either spirally or straight, the surfaces of metal
and other rolls, the design, arrangement and construction of the bed, and the
method of reversing the motion of the leading screw and of giving it an accelerated
motion in one direction, fifteen or twenty times faster than in the other direction,
by means of the pullies, wheels and clutch, with working levers, substantially as
herein shewn and described.
3-In a machine for grooving either spirally or straight the surfaces of metal
and other rolls, the design, arrangement and construction of the saddle so as to
carry two tool rests, and the method of throwing off the said tool rests during the
quick return by the self-acting slotted plate, substantially as herein shewn and
described.
4-In a machine for grooving, either spirally or straight, the surfaces of metal
and other rolls, the design, arrangement and construction of the tool rests, employing
round steel tools, and allowing of a vertical adjustment of the said tools after being
cramped down, substantially as herein shewn and described.
5 In a machine for grooving, either spirally or straight the surfaces of metal
and other rolls, the method of attaching the roll to the twisting apparatus, by
means of the adjustable, non-influencing driving clutch, having four double-wedge
keys, tightened upon the roll spindle by the second ring and connecting bolts,
substantially as herein shewn and described.
6-The general design, arrangement, construction and combination of the several
parts as shewn, described and claimed, to produce a machine for grooving, either
spirally or straight the surfaces of metal and other rolls, employing two or more
travelling tools, cutting in one direction and returning at an accelerated speed,
which are thrown off clear of the roll by moving the nuts into which the setting
up screws are run, and in which the roll is twisted or oscillated and "fed" by the
same apparatus, which allows the roll to "slip" or remain standing, during a
portion of the time occupied by the returning tools, which said "slip" can be
varied, so as to give any desired distance between grooves; and in which the roll
is carried by its own spindle and is connected to the twisting or oscillating
apparatus by a non-influencing, or compensating driving clutch, substantially as
herein shewn and described.