OR IMPROVED MODE OR MEANS OF AND MECHANISM FOR OBTAINING AN ADJUSTABLE STROKE RECIPROCATING MOTION WITH APPROXIMATELY UNIFORM MOVEMENT
Year: 1885

page_text: Approximately Uniform Movement.
I WILLIAM NIBLETT, of 19 Alfred Place Kingsdown, in the City and County of
Bristol, Engineer, do hereby declare the nature of my said invention for "NEW OR
IMPROVED MODE OR MEANS OF AND MECHANISM FOR OBTAINING AN ADJUSTABLE
STROKE RECIPROCATING MOTION WITH APPROXIMATELY UNIFORM MOVEMENT," to be
as follows:-
My said invention which is designed to give a reciprocating movement capable
of adjustment as to length and with approximately uniform rate of travel in one
direction or from end to end of each stroke consists in obtaining the motion of or
from certain given plane curve or curves when arranged upon and obliquely to a
rotating axis (that is the motion given in the direction of this axis) this obliqueness
being adjustable thereby its stroke is adjustable.
And in mechanism for this purpose, consisting of a disc or ring capable of being
adjusted upon its support or supports obliquely to the axis of rotation. In the face
of disc or ring and surrounding its axis, is formed a groove opposite portions of
which are made to a certain given curve. And there is a plate the outside of which
is formed into a cam and it is so attached to the disc or ring as to ałow a loop
frame or yoke to work between the two. This loop frame carries a roller at each
end. One roller working in groove of disc or ring and the other working against
the outside of plate or cam which is made of such shape as will insure each roller
being up to its working surface. Loop frame is prevented from rotating by oue
end being formed to work through a slot in a bracket or guide, the other being
connected by globe joint to a part working through a guided bar. This bar is the
recipient of and transmitter of the reciprocating notion. Which motion is in a
line parallel with the axis on which the grooved disc and cam plate rotate.
The length of the reciprocating movement obtained with a given size of
mechanism or length of curve. Is governed by the inclination at which the disc
and cam is set. And can be seen by the index and pointer affixed.
And in order that the said invention may be better understood, I now proceed
to discribe the same with reference to the accompanying sheet of illustrative
drawings and the figures and letters marked thereon.

page_text: I will first show the method of finding the particular curve or curves from which
the motion is obtained.
'
Fig. 1 represents a disc or ring, the face of which is a true plane the circum-
ference of this is divided into an even number of points. And lines are drawn
across its face from point to point opposite as shown. ccare pivots attached by
screws midway between lines and directly opposite each other. These pivots are
sunk in so that the centre of pivots come level with the face of disc.
Fig. 2 shows the disc or ring mounted on a shaft or spindle which is smaller
than the bore of disc but on sides opposite each other are projections which come
to size of bore. And in these holes are made for pivots to enter. This disc should
be mounted perfectly true with spindle. Which being smaller than bore alows
disc to swivel on the pivots. It should now be secured in the oblique position
shown and spindle be supported in bearings which would allow it to rotate.
It may be supported in a Lathe and in the slide rest of which would be fixed
a fine tool or point, which point must be exactly level with the centre of spindle.
But capable of being moved by slide rest to any position at that level.
The slide rest should be set, with one slide parallel with the axis on which
spindle and disc rotate. And the other at a right angle thereto. The tool or
point is fixed in the slide rest and during these operations will remain fixed. And
when I speak of tool being advanced or withdrawn I mean its being moved to or
from the face of disc by the slide which is parallel with axis. And by its being
moved towards centre or moved from centre I mean by the slide which is at a right
angle to axis. During these operations the disc will remain in one position on its
spindle. And the spindle will not be removed from its bearings.
Now having slide rest tool and all in position. The disc should be rotated to
such position that radial line d is just level with tool point. The tool point
should now be brought up to touch the disc exactly on this radial line and about
the distance from its centre shown by dotted line, tool point should here make a
faint mark and then be withdrawn, just sufficient to allow radial line e to come to
the tool point. The distance it is necessary for the tool to be withdrawn should
be carefully noted. It must now be further withdrawn that same distance, leaving
a faint mark as before. It will now require to be moved a little from centre
so that the next radial line comes exactly to tool point. It must now be further
withdrawn the same distance as before must also be moved from centre till the
next radial line comes exactly to the tool point. Each time the tool point must be
withdrawn exactly the same distance and then be moved from the centre till the
radial line comes exactly to the tool point and at each line it must leave a faint
mark. These operations must be repeated till the radial lines on one half of one
side are faintly marked.
To mark each radial line on the other half, our operations will be reversed. Disc
must be turned back to the line were the start was made, bring the tool point
exactly to the marked place were the start was made. Now turn back the disc so
as to free the tool point. Then advance the tool point exactly the same distance
as each time before it was withdrawed. It will now require to be moved from
the centre till the radial line comes exactly to the tool point. And must proceed
in this way from line to line till this half is done.
Having now got all the points through which the curve on one side of disc
will pass. The lines on the opposite side of disc can be marked at distances from
the circumference the same as this side.
Curves must be struck passing through each one of the faint marks of tool point
on radial lines on one side, and through the points marked by these on the opposite
side of disc. The ends of curves meeting and presenting a shape about like that
shown by dotted line at fig. 1.
We now have curves the special features of which are, That they have approxi-
mately uniform rate of movement in the direction of axis from one end to the
other, when set at different angles to that axis. Or in other words they would

page_text: give this movement to any thing bearing against them that was capable of moving
only on a level with the axis of rotation.
Having discribed the method of finding these curves I will now proceed to
explain the mechanism for obtaining their movement. And communicating the
same to any thing requiring it.
At fig. 3 on the accompanying sheet of drawings, is shown the disc or ring with
a roller groove in its face, which groove should be made to the before discribed
curves. This disc differs from that shown at fig. 1 in having around its bore
a projecting collar which receive the pivots.
Fig. 4 is an end view of the mechanism, showing disc, cam plate &c, together in
working order. A being the disc supported by its pivots on spindle O and capable
of oblique adjustment thereon. D is the cam plate secured to the projecting collar
on A by screws, one side of D is broke away so as to show loop frame B, One end
of which works through guide bracket F and to the other end exactly opposite the
centre of roller working in disc, is connected by globe joint to the part G. which
part is constrained to move squarely through bar H. Therefore this bar receives
from disc at curved groove. All its movement in the direction of axis. K is one
of the guides in which bar H works. E is the roller on loop frame which works
against cam plate. The other roller on loop frame which works in groove is not
shown, it being on the opposite side of globe joint N.
Fig. 5 is a side view of fig. 4 showing means for adjusting the angle of disc and
cam plate. Each part is lettered as in fig. 4. Part P which is solid with spindle O
carries on its beveled face an index, and also a screw. V is a slight part or blade
in one with A and having a pointer near it end, this slides over index and under
the head of screw on P by which it can be held in any position. Thereby. securing
the disc and cam plate at any angle. Which can be seen by pointer on index.
I will now explain its action. Which will be understood by refering to figs. 4
and 5. On the rotation of spindle loop frame will have a to and fro movement
across disc and through guides F and bar H. And when disc and cam are obliquely
set. Loop frame will also have movement in the direction of axis, guide F being
a long slot will alow this movement.
But part G working squarely through bar H, will give the movement to that
bar which its-self receives from loop frame at globe joint N, which is always exactly
opposite the centre of curved groove. Consequently this bar has the reciprocating
motion. And by which, it may be transmitted to any thing requiring this motion.
Movement from curve in one direction only. May be obtained by having curve
to stand in relief on disc or ring. Which may be divided in two and both or
only one half may be used. In this case cam plate and loop frame will be dispensed
with. The guided bar carrying a roller to work against curve as shown in fig. 6.
Which shows it arranged with only one half, and as there shown would give
movement to bar from right to left. Bar with roller may be kept to its work by
any suitable means.

page_text: Obtaining an Adjustable TOKU NOV
Approximately Uniform Movement..
I WILLIAM NIBLETT of 19 Alfred Place Kingsdown, in the City and County of
Bristol, Engineer do hereby declare the nature of my invention for NEW OR
IMPROVED MODE OR MEANS OF AND MECHANISM FOR OBTAINING AN ADJUSTABLE
STROKE RECIPROCATING MOTION WITH APPROXIMATELY UNIFORM MOVEMENT and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My said invention, which may be used in any machinery requiring such, is
designed to give a reciprocating motion capable of adjustment as to length, and
with approximately uniform rate of travel in one direction, or from end to end of
each stroke. Consists in obtaining the motion of, or from, certain given plane curve,
or curves, when arranged upon, and obliquely to, a rotating axis, (that is the motion
given in the direction of this axis) this obliqueness being adjustable thereby its
stroke is adjustable.
And mechanism for this purpose, consisting of a disc or ring capable of being
adjusted upon its support or supports, obliquely to the axis of rotation. In the
face of disc or.ring, and surrounding its axis, is formed a groove, opposite portions
of which are made to a certain given curve. And there is a plate in and around
the face of which is formed a roller groove, and it is so attached to the disc or ring,
as to alow a loop frame or yoke to work between the two. This loop frame carries
a roller at each end, one roller working in groove of disc or ring, and the other
working in groove in plate. This groove in plate has to be so designed, that every
line drawn from its centre through the axis of rotation to the centre of curved
groove in disc opposite, shall be of equal length. Loop frame is prevented from
rotating, by one end being formed to work through a slot in a fixed guide or
bracket, the other being connected by globe joint, to a part. working through a
guided bar. This bar is the recipient of, and transmitter of the reciprocating motion.
Which motion is in a line parallel with the axis on which the grooved disc and
grooved plate rotate.
The length of the reciprocating movement obtained, with a given size of
mechanism, or length of curve. Is governed by the inclination at which the disc
and plate is set. And can be seen by the index and pointer affixed.
And in order that my said invention may be better understood. I now proceed
to discribe the same, with reference to the accompanying sheet of illustrative
drawings and the figures and letters marked thereon.
I will first show the method of finding the particular curve or curves from which
the motion is obtained.
Fig. 1. represents a disc or ring, the face of which is a true plane, the circum-
ference of this is divided into an even number of equidistant points, and lines are

page_text: drawn across its face from point to point opposite as shown. c c. are pivots.
attached by screws midway between lines and directly opposite each other. These
pivots are sunk in so that the centre of pivots come level with the face of disc.
Fig. 2. shows the disc mounted on a shaft or spindle which is smaller than the
bore of disc, but on sides opposite each other are projections which come to size of
bore, and in these holes are made for pivots to enter. This disc should be mounted.
so as to run perfectly true when set at a right angle to axis. Spindle being smaller
than bore of disc it alows disc to swivel on the pivots. Disc should now be secured.
in the oblique position shown, and spindle be supported in bearings which would
alow it to rotate without end motion.
It may be supported in a lathe, and in the slide rest of which, would be fixed a
fine tool or point. Which point must be exactly level with the centre of spindle,.
but capable of being moved by slide rest to any position at that level.
The slide rest should be set, with one slide parallel with the axis, on which.
spindle and disc rotate. And the other at a right angle thereto. The tool or point
is fixed in slide rest and during these operations, will remain fixed. And when
I speak of tool being advanced or withdrawn, I mean by its being move to or from
the face of disc, by the slide which is parallel with axis. And by its being moved
towards centre, or moved from centre, I mean by the slide which is at a right angle.
to axis. During these operations the disc will remain.in oue position on its spindle,
and spindle will not be removed from its bearings.
Now having spindle with disc, in the lathe, and slide rest and tool all ready as
described. The disc should be rotated to such position that radial line, d, is just
level with tool point. The tool point should now he brought up to touch disc
exactly on this radial line, and about the distance from its centre shown by dotted
line, tool point should here make a faint mark and then be withdrawn, just sufficient..
to alow radial line, e, to come to the tool point. The distance it is necessary for the
tool to be withdrawn, should be carefully noted. It must now be further withdrawn
that same distance, leaving a faint mark as before, and it will require to be moved
a little from centre, so that the next radial line comes exactly to tool point. It
must now be further withdrawn the. same distance as before; must also be moved
from centre till the next radial line comes exactly to the tool point. Each time the.
tool must be withdrawn exactly the same distance, and then be moved from the
centre till the radial line comes exactly to the tool point, and at each line it must
leave a faint mark. These operations must be repeated till the radial lines on one.
half, of one side are faintly marked.
To mark each radial line on the other half operations will be reversed. Disc must-
be turned back to the line were it started from, bring the tool point exactly to the
marked place were the start was made, now turn back the disc so as to free the tool.
point, then advance the tool point exactly the same distance as each time before it
was withdrawed, it will now require to be moved from the centre till the radial
line comes exactly to the tool point. And must proceed in this way from line to.
line till this half is done.
Having now all the points through which the curve on one side of disc will.
pass. The lines on the opposite side of, disc; can be marked at distances from the
circumference the same as this side.
Curves must be struck passing through each one of the faint marks of tool on.
radial lines on one side. And through the points marked by these on the opposite
side of disc. The ends of curves meeting and presenting a shape about like that
shown by dotted line at Fig. 1..
We now have curves the peculiar features of which are. That they have
approximately uniform rate of movement in the direction of axis from one en i to:
the other, when set at different angles, to that axis. Or in other words there would
be approximately equal distances.moved, in equal degrees of rotation.
Having described the method of finding these curves, I will now proceed to:
explain the mechanism for obtaining their movement, and communicating the same
to anything requiring it,

page_text: At Fig. 3. is shown the disc with a roller groove in its face, which groove should
be made to the before discribed curves, groove is cut right through disc but there is
supporting peices at the back as shown. This disc differs from that shown at Fig. 1..
in having around its bore a projecting collar which receives the pivots.
Fig. 4. is an end view of the mechanism showing disc, groove plate, &c together
in working order.. A being the disc, 'supported by its pivots on spindle, Ŏ, and
capable of oblique adjustment thereon, spindle should be in bearings which would
allow it to revolve without end motion. D is the groove plate with the groove in
it cut right through, but there is supporting peices at the back as shown, this plate
is secured to the projecting collar on A, by screws the heads of which are shown.
One side of D is broke away so as to show loop frame B, which works between
disc and groove plate, the shape of this loop frame is shown by dotted lines, it is
made to work easily over the collar surrounding the bore of disc. One end of
loop frame is formed into a round stem, to move easily in a long slot in guide
bracket F, and to the other end at a point exactly opposite the centre of the roller
which works in disc, is connected by swivel or globe joint, the part G. Which
part is constrained to move squarely through the guided bar, H. Therefore this
bar receives from curved groove, all its movement in the direction of axis. Bar H.
can move only in the direction of axis, as it works through guides K K Fig. 5.
one of which is shown in Fig. 4. E is the roller on loop frame which works in
groove plate D. The other roller on loop frame which works in disc groove is not
shown it being on the opposite side of globe joint N. centre of globe joint should
be in a line with pivots and with round end of loop frame which works.in guide
bracket F.
Fig. 5. is a side view of Fig. 4 showing means for adjusting the angle of disc
, and plate. Each part is lettered as in Fig. 4. part P, which is solid with spindle O
carries on its beveled face an index, and also a screw, V is a slight part or blade in
one with A, and having a pointer near its end, this slides over index and under the
head of screw on P, by which it can be held in any position. Thereby securing
the disc and plate at different angles, which can be seen by pointer on index.
I will now explain its action, which will be understood by refering to Figs. 4
and 5. It will be seen that when spindle revolves with disc and plate set at a
right angle to axis, the only motion given to loop frame will be a to and fro
movement across disc and plate and through guide F, and part G through bar H.
But when disc and plate are obliquely set, they will have a wabbling or swash
plate motion, loop frame being between disc and plate will partake of this motion,.
guide F being a long slot will alow of this wabbling motion. But part G working
squarely through bar H, will give to that bar, all movement in the direction of
axis which itself receives from loop-frame at globe joint N. As globe joint is
opposite the centre of roller, it is opposite the groove in dise and its centre is exact
to the before discribed curve, so this joint receives all movement of curves, and
all its movement in the direction of axis, it gives to bar H. Consequently this
bar has the reciprocating motion. And by which, it may be transmitted or applied
to any thing requiring this motion.
After disc, groove plate, loop frame, &c is made to work as discribed, it is evident
that the roller on loop frame which works in groove plate, or the one which works
in disc, may be removed without altering its action. As it would work as well
with one roller, as with two. Consequently a plain plate or collar may be used in
place of either the grooved plate D or disc A. It is also evident that spindle with
grooved disc &c. may have the reciprocating motion by making bar Ĥ a fixture.
Or bar H and guide F may be connected together and arranged to rotate, instead
of spindle disc &c rotating.
Movement from curve in one direction only. May be obtained by having curves
to stand in relief on disc or ring. Which may be divided in two, being cut
through were the curves meet, each part being a half circile. One or both of these
may be used. In this case grooved plate and loop frame will be dispensed with.
The guided bar carrying a roller to work against curve as shown in Fig. 6. which

page_text: shows it arranged with only one half. Curve may be formed almost to a knife
edge, in order that roller shall bear against curve and not against parts adjacent
thereto. And that it may better withstand wear, it should be made of some very
bard material. Also the roller may be very hard.
As shown in Fig. 6 it would give movement to bar from right to left. Bar may
be brought back to receive its next movement from curve, by any suitable means,
and it could be prevented from returning to far, by an adjustable stop on bar
coming up to guides.
A reciprocating motion with an interval of rest at each end of stroke before it
commences the return movement. May be obtained by shortening the length of
curves and joining their ends by a straight portion as shown by Fig. 7.
Having now particularly discribed 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 obtaining of motion from a particular plane curve when obliquely set
upon, or in relation to an axis, upon which it or the part receiving the motion
rotates, said motion being in the direction of axis, the inclination of curve made
adjustable thereby the length of movement obtained is adjustable, as herein before
discribed with reference to Figs. 1. 2. 3. 4. and 5. This I claim for the purpose of
giving an adjustable stroke or movement approximately uniform in one direction,
or a reciprocating movement approximately uniform from end to end of each
stroke.
(2.) As mechanism for this purpose a true plane or disc obliquely adjustable
upon an axis, and having a roller groove in its face. the centre of groove being to
the aforesaid curves and a plate so attached to disc, as to allow a loop frame or
part, B Fig. 4. to work between disc and its plate, loop frame carrying at one end
of loop a roller to work in disc, and at the other end a roller to work in a suitably
formed groove in plate, and guides to prevent loop frame rotating and part G
connected to loop frame to receive and to communicate its motion in the direction
of axis to bar H, as herein before discribed with reference to Figs. 3. 4. and 5
acting substantially as, and for the purposes specified.
(3.) The loop frame B, carrying only one roller arranged either to work in curved
groove in disc A, or in groove in plate D formed from it, and to work with the
other parts, as hereinbefore discribed with reference to Figs. 4 and 5 and for the
purposes specified.
(4.) The forming of the aforesaid plane curve to stand in relief on disc Fig. 3
the dividing of disc in two parts, and the oblique arrangement of one or both
parts, to give movement to a guided bar, by means of a roller on bar working
against curve, as discribed with reference to Fig. 6, acting substantially as and for
the purposes specified.
D1 1